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Climate and Average Weather Year Round in Northwest Harwich Massachusetts, United States

In Northwest Harwich, the summers are comfortable, humid, and windy; the winters are very cold, snowy, and extremely windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 77°F and is rarely below 12°F or above 84°F.

Based on the tourism score, the best time of year to visit Northwest Harwich for warm-weather activities is from mid June to mid September.

Climate in Northwest Harwich

very coldcoldcoolwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow63%63%46%46%clearovercastprecipitation: 4.0 inprecipitation: 4.0 in2.4 in2.4 inmuggy: 51%muggy: 51%0%0%drydrytourism score: 7.3tourism score: 7.30.00.0
Northwest Harwich weather by month. Click on each chart for more information.

The warm season lasts for 3.2 months, from June 11 to September 18, with an average daily high temperature above 69°F. The hottest month of the year in Northwest Harwich is July, with an average high of 77°F and low of 65°F.

The cold season lasts for 3.4 months, from December 9 to March 22, with an average daily high temperature below 45°F. The coldest month of the year in Northwest Harwich is January, with an average low of 26°F and high of 38°F.

Average High and Low Temperature in Northwest Harwich

Average High and Low Temperature in Northwest HarwichwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 3037°FJan 3037°FJul 2577°FJul 2577°F25°F25°F66°F66°FJun 1169°FJun 1169°FSep 1869°FSep 1869°FDec 945°FDec 945°FMar 2245°FMar 2245°F57°F57°F58°F58°F33°F33°F34°F34°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 38°F39°F44°F52°F61°F71°F77°F76°F70°F61°F52°F44°F
Temp. 32°F33°F38°F46°F55°F64°F71°F70°F64°F55°F46°F38°F
Low 26°F27°F33°F41°F49°F59°F65°F64°F58°F49°F40°F32°F

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in Northwest Harwich

Average Hourly Temperature in Northwest HarwichJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowfreezingfreezingvery coldvery coldcoldcoldcoolcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Çaykara, Turkey (5,275 miles away); Kōya, Japan (6,952 miles); and Ōfunato, Japan (6,516 miles) are the far-away foreign places with temperatures most similar to Northwest Harwich (view comparison).

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Compare Northwest Harwich to another city:

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In Northwest Harwich, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Northwest Harwich begins around June 25 and lasts for 4.5 months, ending around November 9.

The clearest month of the year in Northwest Harwich is September, during which on average the sky is clear, mostly clear, or partly cloudy 62% of the time.

The cloudier part of the year begins around November 9 and lasts for 7.5 months, ending around June 25.

The cloudiest month of the year in Northwest Harwich is May, during which on average the sky is overcast or mostly cloudy 54% of the time.

Cloud Cover Categories in Northwest Harwich

Cloud Cover Categories in Northwest HarwichclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 563%Sep 563%May 2346%May 2346%Jun 2554%Jun 2554%Nov 954%Nov 954%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 53%53%53%53%54%49%43%40%38%40%47%52%
Clearer 47%47%47%47%46%51%57%60%62%60%53%48%

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Northwest Harwich varies throughout the year.

The wetter season lasts 10 months, from July 27 to June 5, with a greater than 27% chance of a given day being a wet day. The month with the most wet days in Northwest Harwich is December, with an average of 9.5 days with at least 0.04 inches of precipitation.

The drier season lasts 1.7 months, from June 5 to July 27. The month with the fewest wet days in Northwest Harwich is July, with an average of 7.5 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Northwest Harwich is April, with an average of 8.3 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 29% on April 11.

Daily Chance of Precipitation in Northwest Harwich

Daily Chance of Precipitation in Northwest HarwichwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 1032%Dec 1032%Jun 3021%Jun 3021%NowNowrainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 6.2d5.6d7.7d8.3d8.4d7.4d7.5d7.8d7.2d8.2d8.3d8.1d
Mixed 1.7d1.7d1.1d0.2d0.0d0.0d0.0d0.0d0.0d0.0d0.2d1.1d
Snow 0.9d0.9d0.3d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.0d0.3d
Any 8.8d8.1d9.2d8.5d8.4d7.4d7.5d7.8d7.2d8.2d8.5d9.5d

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Northwest Harwich experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Northwest Harwich. The month with the most rain in Northwest Harwich is November, with an average rainfall of 3.9 inches.

The month with the least rain in Northwest Harwich is July, with an average rainfall of 2.5 inches.

Average Monthly Rainfall in Northwest Harwich

Average Monthly Rainfall in Northwest HarwichJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inNov 263.9 inNov 263.9 inJul 72.4 inJul 72.4 inMar 293.9 inMar 293.9 inJun 13.1 inJun 13.1 inJan 292.6 inJan 292.6 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 2.8″2.8″3.7″3.6″3.1″2.8″2.5″3.0″3.3″3.7″3.9″3.6″

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Northwest Harwich experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 4.0 months, from December 2 to April 1, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Northwest Harwich is February, with an average snowfall of 4.8 inches.

The snowless period of the year lasts for 8.0 months, from April 1 to December 2. The least snow falls around July 27, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall in Northwest Harwich

Average Monthly Snowfall in Northwest HarwichsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inFeb 65.1 inFeb 65.1 inJul 270.0 inJul 270.0 inDec 21.0 inDec 21.0 inApr 11.0 inApr 11.0 in
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Snowfall 4.4″4.8″2.0″0.4″0.0″0.0″0.0″0.0″0.0″0.0″0.3″2.0″

The length of the day in Northwest Harwich varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 9 minutes of daylight; the longest day is June 20, with 15 hours, 12 minutes of daylight.

Hours of Daylight and Twilight in Northwest Harwich

Hours of Daylight and Twilight in Northwest HarwichJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 12 minJun 2015 hr, 12 minJun 2012 hr, 11 minSep 2212 hr, 11 minSep 229 hr, 9 minDec 219 hr, 9 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.5h10.6h12.0h13.4h14.6h15.2h14.8h13.8h12.4h11.0h9.8h9.2h

The earliest sunrise is at 5:05 AM on June 14, and the latest sunrise is 2 hours, 9 minutes later at 7:14 AM on November 2. The earliest sunset is at 4:09 PM on December 7, and the latest sunset is 4 hours, 9 minutes later at 8:19 PM on June 26.

Daylight saving time (DST) is observed in Northwest Harwich during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Northwest Harwich

Sunrise & Sunset with Twilight and Daylight Saving Time in Northwest HarwichJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:05 AMJun 145:05 AM8:19 PMJun 268:19 PMJun 26Dec 74:09 PMDec 74:09 PM7:14 AMNov 27:14 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Northwest Harwich

Solar Elevation and Azimuth in Northwest HarwichJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM0001010101020202030303040405050606000010101020202020303040405050602572NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Northwest Harwich

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Northwest Harwich experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.2 months, from June 17 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 13% of the time. The month with the most muggy days in Northwest Harwich is July, with 13.5 days that are muggy or worse.

The least muggy day of the year is March 5, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Northwest Harwich

Humidity Comfort Levels in Northwest HarwichmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 50%Mar 50%Aug 151%Aug 151%Jun 1713%Jun 1713%Sep 2213%Sep 2213%NowNowoppressiveoppressivemuggymuggydrydryhumidhumidcomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.1d3.8d13.5d12.5d5.3d0.7d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Northwest Harwich experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 6.2 months, from October 10 to April 16, with average wind speeds of more than 14.9 miles per hour. The windiest month of the year in Northwest Harwich is January, with an average hourly wind speed of 18.4 miles per hour.

The calmer time of year lasts for 5.8 months, from April 16 to October 10. The calmest month of the year in Northwest Harwich is July, with an average hourly wind speed of 11.4 miles per hour.

Average Wind Speed in Northwest Harwich

Average Wind Speed in Northwest HarwichwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphJan 1318.6 mphJan 1318.6 mphJul 2411.2 mphJul 2411.2 mphOct 1014.9 mphOct 1014.9 mphApr 1614.9 mphApr 1614.9 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 18.418.016.814.913.212.211.411.513.015.317.118.1

The predominant average hourly wind direction in Northwest Harwich varies throughout the year.

The wind is most often from the north for 2.1 weeks, from March 29 to April 13, with a peak percentage of 31% on March 30. The wind is most often from the south for 5.6 months, from April 13 to September 30, with a peak percentage of 43% on July 13. The wind is most often from the west for 6.0 months, from September 30 to March 29, with a peak percentage of 46% on January 1.

Wind Direction in Northwest Harwich

Wind Direction in Northwest HarwichWNSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Northwest Harwich is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.0 months, from June 28 to September 28, with an average temperature above 61°F. The month of the year in Northwest Harwich with the warmest water is August, with an average temperature of 67°F.

The time of year with cooler water lasts for 4.0 months, from December 25 to April 23, with an average temperature below 44°F. The month of the year in Northwest Harwich with the coolest water is February, with an average temperature of 39°F.

Average Water Temperature in Northwest Harwich

Average Water Temperature in Northwest HarwichwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°FAug 867°FAug 867°F39°FFeb 2939°FFeb 29Jun 2861°FJun 2861°FSep 2861°FSep 2861°FDec 2544°FDec 2544°FApr 2344°FApr 2344°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 42°F39°F39°F43°F50°F58°F65°F67°F64°F57°F51°F46°F

To characterize how pleasant the weather is in Northwest Harwich throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Northwest Harwich for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of August.

Tourism Score in Northwest Harwich

Tourism Score in Northwest Harwichbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.37.30.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Northwest Harwich for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score in Northwest Harwich

Beach/Pool Score in Northwest Harwichbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.75.70.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Northwest Harwich typically lasts for 7.1 months (217 days), from around April 8 to around November 11, rarely starting before March 24 or after April 25, and rarely ending before October 25 or after November 29.

Time Spent in Various Temperature Bands and the Growing Season in Northwest Harwich

Time Spent in Various Temperature Bands and the Growing Season in Northwest Harwichgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 850%Apr 850%Nov 1150%Nov 1190%Apr 2590%Apr 2590%Oct 2590%Oct 2510%Mar 2410%Mar 2410%Nov 2910%Nov 290%Feb 40%Feb 4Jul 31100%Jul 31100%freezingvery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Northwest Harwich should appear around May 12, only rarely appearing before May 5 or after May 21.

Growing Degree Days in Northwest Harwich

Growing Degree Days in Northwest HarwichJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FMay 1290°FMay 1290°FJul 13900°FJul 13900°FAug 261,800°FAug 261,800°FDec 312,583°FDec 312,583°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.3 months, from May 6 to August 16, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest month of the year in Northwest Harwich is June, with an average of 6.9 kWh.

The darker period of the year lasts for 3.4 months, from November 3 to February 14, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest month of the year in Northwest Harwich is December, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy in Northwest Harwich

Average Daily Incident Shortwave Solar Energy in Northwest HarwichbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 297.1 kWhJun 297.1 kWhDec 231.6 kWhDec 231.6 kWhMay 66.0 kWhMay 66.0 kWhAug 166.0 kWhAug 166.0 kWhNov 32.7 kWhNov 32.7 kWhFeb 142.7 kWhFeb 142.7 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 1.92.84.05.36.36.96.76.04.93.52.31.7

For the purposes of this report, the geographical coordinates of Northwest Harwich are 41.690 deg latitude, -70.103 deg longitude, and 26 ft elevation.

The topography within 2 miles of Northwest Harwich is essentially flat, with a maximum elevation change of 72 feet and an average elevation above sea level of 28 feet. Within 10 miles is essentially flat (151 feet). Within 50 miles also contains only modest variations in elevation (417 feet).

The area within 2 miles of Northwest Harwich is covered by artificial surfaces (52%) and trees (39%), within 10 miles by water (63%) and artificial surfaces (20%), and within 50 miles by water (85%).

This report illustrates the typical weather in Northwest Harwich, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Northwest Harwich.

For each station, the records are corrected for the elevation difference between that station and Northwest Harwich according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Northwest Harwich is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Northwest Harwich and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Northwest Harwich and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.