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Climate and Average Weather Year Round at East Milton Massachusetts, United States

At East Milton, the summers are warm, the winters are very cold and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 21°F to 82°F and is rarely below 7°F or above 90°F.

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

Climate at East Milton

very coldcoldcoolwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow64%64%46%46%clearovercastprecipitation: 4.1 inprecipitation: 4.1 in2.7 in2.7 inmuggy: 41%muggy: 41%0%0%drydrytourism score: 6.8tourism score: 6.80.10.1
East Milton weather by month. Click on each chart for more information.

The warm season lasts for 3.3 months, from June 2 to September 13, with an average daily high temperature above 73°F. The hottest month of the year at East Milton is July, with an average high of 81°F and low of 65°F.

The cold season lasts for 3.4 months, from December 1 to March 13, with an average daily high temperature below 45°F. The coldest month of the year at East Milton is January, with an average low of 22°F and high of 36°F.

Average High and Low Temperature at East Milton

Average High and Low Temperature at East MiltonwarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 3036°FJan 3036°FJul 2082°FJul 2082°F21°F21°F65°F65°FJun 273°FJun 273°FSep 1373°FSep 1373°FDec 145°FDec 145°FMar 1345°FMar 1345°F55°F55°F58°F58°F32°F32°F30°F30°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 36°F38°F46°F57°F68°F76°F81°F79°F71°F61°F50°F41°F
Temp. 28°F30°F37°F48°F58°F67°F72°F71°F64°F53°F44°F34°F
Low 22°F24°F31°F41°F50°F59°F65°F64°F57°F47°F37°F28°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 at East Milton

Average Hourly Temperature at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec12 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 coldcoldcoldcoolcoolcomfortablewarmfreezingfreezing
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.

Odessa, Ukraine (4,670 miles away); Paraul, Russia (5,441 miles); and Saku, Japan (6,712 miles) are the far-away foreign places with temperatures most similar to East Milton (view comparison).

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At East Milton, 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 at East Milton begins around June 25 and lasts for 4.4 months, ending around November 6.

The clearest month of the year at East Milton 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 6 and lasts for 7.6 months, ending around June 25.

The cloudiest month of the year at East Milton is May, during which on average the sky is overcast or mostly cloudy 53% of the time.

Cloud Cover Categories at East Milton

Cloud Cover Categories at East MiltonclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 564%Sep 564%Feb 2846%Feb 2846%Jun 2554%Jun 2554%Nov 655%Nov 655%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 51%53%53%53%53%49%42%39%38%40%48%52%
Clearer 49%47%47%47%47%51%58%61%62%60%52%48%

East Milton does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 23% to 32%, with an average value of 28%.

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 at East Milton is June, with an average of 9.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 32% on May 23.

Daily Chance of Precipitation at East Milton

Daily Chance of Precipitation at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%May 2332%May 2332%Sep 323%Sep 323%Nov 1828%Nov 1828%NowNowmixedrainsnow
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 3.6d3.6d6.1d7.8d9.3d9.2d9.2d8.5d7.5d8.0d7.1d5.6d
Mixed 2.6d2.3d2.0d0.4d0.0d0.0d0.0d0.0d0.0d0.1d0.9d2.2d
Snow 1.7d1.6d0.7d0.1d0.0d0.0d0.0d0.0d0.0d0.0d0.1d1.0d
Any 7.8d7.4d8.7d8.4d9.3d9.2d9.2d8.5d7.5d8.1d8.2d8.8d

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. East Milton experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at East Milton. The month with the most rain at East Milton is October, with an average rainfall of 3.8 inches.

The month with the least rain at East Milton is January, with an average rainfall of 2.1 inches.

Average Monthly Rainfall at East Milton

Average Monthly Rainfall at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 inOct 203.9 inOct 203.9 inJan 242.0 inJan 242.0 inApr 23.8 inApr 23.8 inJun 23.5 inJun 23.5 inAug 103.2 inAug 103.2 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 2.1″2.3″3.4″3.6″3.3″3.2″2.8″3.1″3.4″3.8″3.7″3.1″

Snowfall

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

The snowy period of the year lasts for 5.4 months, from November 4 to April 17, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at East Milton is February, with an average snowfall of 9.7 inches.

The snowless period of the year lasts for 6.6 months, from April 17 to November 4. The least snow falls around July 29, with an average total accumulation of 0.0 inches.

Average Monthly Snowfall at East Milton

Average Monthly Snowfall at East MiltonsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inJan 2710.3 inJan 2710.3 inJul 290.0 inJul 290.0 inNov 41.0 inNov 41.0 inApr 171.0 inApr 171.0 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 9.7″9.7″5.7″1.2″0.1″0.0″0.0″0.0″0.0″0.1″2.1″6.3″

The length of the day at East Milton varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 6 minutes of daylight; the longest day is June 20, with 15 hours, 16 minutes of daylight.

Hours of Daylight and Twilight at East Milton

Hours of Daylight and Twilight at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1915 hr, 16 minJun 2015 hr, 16 minJun 2012 hr, 11 minSep 2212 hr, 11 minSep 229 hr, 6 minDec 219 hr, 6 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 9.5h10.6h12.0h13.4h14.6h15.2h14.9h13.8h12.4h11.0h9.8h9.2h

The earliest sunrise is at 5:07 AM on June 14, and the latest sunrise is 2 hours, 12 minutes later at 7:19 AM on November 2. The earliest sunset is at 4:12 PM on December 8, and the latest sunset is 4 hours, 13 minutes later at 8:24 PM on June 26.

Daylight saving time (DST) is observed at East Milton 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 at East Milton

Sunrise & Sunset with Twilight and Daylight Saving Time at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:07 AMJun 145:07 AM8:24 PMJun 268:24 PMJun 26Dec 84:12 PMDec 84:12 PM7:19 AMNov 27:19 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 at East Milton

Solar Elevation and Azimuth at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec12 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 AM0001010101020202030303040405050606000010101020202020303040405050602471NowNow
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 at East Milton

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.

East Milton experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.4 months, from June 10 to September 21, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The month with the most muggy days at East Milton is July, with 11.1 days that are muggy or worse.

The least muggy day of the year is January 31, when muggy conditions are essentially unheard of.

Humidity Comfort Levels at East Milton

Humidity Comfort Levels at East MiltonmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 310%Jan 310%Jul 3141%Jul 3141%Jun 1010%Jun 1010%Sep 2110%Sep 2110%NowNowoppressiveoppressivemuggymuggydrydrycomfortablecomfortable
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 0.0d0.0d0.0d0.0d0.5d4.6d11.1d9.9d3.9d0.6d0.0d0.0d

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 at East Milton experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from October 26 to April 22, with average wind speeds of more than 6.6 miles per hour. The windiest month of the year at East Milton is February, with an average hourly wind speed of 8.4 miles per hour.

The calmer time of year lasts for 6.1 months, from April 22 to October 26. The calmest month of the year at East Milton is July, with an average hourly wind speed of 4.8 miles per hour.

Average Wind Speed at East Milton

Average Wind Speed at East MiltonwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphFeb 238.5 mphFeb 238.5 mphJul 314.6 mphJul 314.6 mphOct 266.6 mphOct 266.6 mphApr 226.6 mphApr 226.6 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) 8.28.48.06.95.85.14.84.85.46.37.17.6

The predominant average hourly wind direction at East Milton is from the west throughout the year.

Wind Direction at East Milton

Wind Direction at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec0%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).

East Milton 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 3.1 months, from June 24 to September 27, with an average temperature above 61°F. The month of the year at East Milton with the warmest water is August, with an average temperature of 66°F.

The time of year with cooler water lasts for 3.8 months, from December 27 to April 20, with an average temperature below 44°F. The month of the year at East Milton with the coolest water is February, with an average temperature of 38°F.

Average Water Temperature at East Milton

Average Water Temperature at East MiltonwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°FAug 466°FAug 466°F38°FFeb 2738°FFeb 27Jun 2461°FJun 2461°FSep 2761°FSep 2761°FDec 2744°FDec 2744°FApr 2044°FApr 2044°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.
WaterJanFebMarAprMayJunJulAugSepOctNovDec
Temperature 41°F38°F39°F43°F50°F58°F65°F66°F63°F57°F50°F45°F

To characterize how pleasant the weather is at East Milton 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 East Milton for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of August.

Tourism Score at East Milton

Tourism Score at East Miltonbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.86.80.10.1NowNowtemperaturetemperature 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 East Milton for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score at East Milton

Beach/Pool Score at East Miltonbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.45.40.00.0NowNowtemperaturetemperature 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 at East Milton typically lasts for 6.6 months (203 days), from around April 10 to around October 30, rarely starting before March 25 or after April 27, and rarely ending before October 14 or after November 15.

Time Spent in Various Temperature Bands and the Growing Season at East Milton

Time Spent in Various Temperature Bands and the Growing Season at East Miltongrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1050%Apr 1050%Oct 3050%Oct 3090%Apr 2790%Apr 2790%Oct 1490%Oct 1410%Mar 2510%Mar 2510%Nov 1510%Nov 150%Feb 40%Feb 4Jul 15100%Jul 15100%freezingvery coldcoldcoolcomfortablewarmhot
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 at East Milton should appear around April 22, only rarely appearing before April 7 or after May 6.

Growing Degree Days at East Milton

Growing Degree Days at East MiltonJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°FApr 2289°FApr 2289°FJul 1900°FJul 1900°FAug 101,800°FAug 101,800°FDec 312,855°FDec 312,855°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 3.5 months, from May 4 to August 19, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest month of the year at East Milton is June, with an average of 6.7 kWh.

The darker period of the year lasts for 3.3 months, from November 2 to February 11, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest month of the year at East Milton is December, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy at East Milton

Average Daily Incident Shortwave Solar Energy at East MiltonbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 296.9 kWhJun 296.9 kWhDec 231.6 kWhDec 231.6 kWhMay 45.8 kWhMay 45.8 kWhAug 195.8 kWhAug 195.8 kWhNov 22.7 kWhNov 22.7 kWhFeb 112.7 kWhFeb 112.7 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) 2.02.84.05.26.16.76.65.94.83.42.21.7

For the purposes of this report, the geographical coordinates of East Milton are 42.212 deg latitude, -71.115 deg longitude, and 610 ft elevation.

The topography within 2 miles of East Milton contains significant variations in elevation, with a maximum elevation change of 581 feet and an average elevation above sea level of 159 feet. Within 10 miles also contains significant variations in elevation (614 feet). Within 50 miles contains significant variations in elevation (2,031 feet).

The area within 2 miles of East Milton is covered by trees (62%) and artificial surfaces (37%), within 10 miles by artificial surfaces (67%) and trees (24%), and within 50 miles by trees (41%) and water (30%).

This report illustrates the typical weather at East Milton, 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

East Milton has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Norwood Memorial Airport, Logan International Airport, Cranland Airport, Lawrence G Hanscom Field, Taunton Municipal Airport, Beverly Municipal Airport, Marshfield Airport, and North Central State Airport.

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.