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Average Weather at Nantucket Memorial Airport Massachusetts, United States

At Nantucket Memorial Airport, the summers are comfortable, humid, and windy; the winters are very cold, wet, and extremely windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 26°F to 75°F and is rarely below 14°F or above 81°F.

Based on the tourism score, the best time of year to visit Nantucket Memorial Airport for warm-weather activities is from late June to late September.

Climate Summary

very coldcoldcoolcomfortablecoolcoldJanFebMarAprMayJunJulAugSepOctNovDec62%62%45%45%clearovercastprecipitation: 4.0 inprecipitation: 4.0 in2.3 in2.3 inmuggy: 52%muggy: 52%0%0%drydrytourism score: 7.4tourism score: 7.40.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 3.3 months, from June 15 to September 24, with an average daily high temperature above 68°F. The hottest day of the year is July 30, with an average high of 75°F and low of 64°F.

The cold season lasts for 3.4 months, from December 13 to March 24, with an average daily high temperature below 45°F. The coldest day of the year is January 30, with an average low of 26°F and high of 38°F.

Average High and Low Temperature

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.

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

Average Hourly Temperature at Nantucket Memorial AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingvery coldvery coldcoldcoldcoolcoolcomfortablefreezing
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.

Köprübaşı, Turkey (5,286 miles away) and Ōfunato, Japan (6,545 miles) are the far-away foreign places with temperatures most similar to Nantucket Memorial Airport (view comparison).

Clouds

At Nantucket Memorial Airport, 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 Nantucket Memorial Airport begins around June 26 and lasts for 4.6 months, ending around November 12. On September 6, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 62% of the time, and overcast or mostly cloudy 38% of the time.

The cloudier part of the year begins around November 12 and lasts for 7.4 months, ending around June 26. On May 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% of the time.

Cloud Cover Categories

Cloud Cover Categories at Nantucket Memorial AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 662%Sep 662%May 1545%May 1545%Jun 2653%Jun 2653%Nov 1254%Nov 1254%clearmostly 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.

Precipitation

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

The wetter season lasts 10 months, from July 29 to June 4, with a greater than 26% chance of a given day being a wet day. The chance of a wet day peaks at 31% on December 11.

The drier season lasts 1.8 months, from June 4 to July 29. The smallest chance of a wet day is 20% on July 1.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 30% on April 12.

Daily Chance of Precipitation

Daily Chance of Precipitation at Nantucket Memorial AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 1131%Dec 1131%Jul 120%Jul 120%Jul 2926%Jul 2926%Jun 426%Jun 426%rainmixedsnow
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).

Rainfall

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. Nantucket Memorial Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Nantucket Memorial Airport. The most rain falls during the 31 days centered around November 29, with an average total accumulation of 3.9 inches.

The least rain falls around July 8, with an average total accumulation of 2.3 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Nantucket Memorial Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 3.5 months, from December 13 to March 28, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 6, with an average total liquid-equivalent accumulation of 0.4 inches.

The snowless period of the year lasts for 8.5 months, from March 28 to December 13. The least snow falls around July 31, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Nantucket Memorial AirportsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 inFeb 60.4 inFeb 60.4 inJul 310.0 inJul 310.0 inDec 130.1 inDec 130.1 inMar 280.1 inMar 280.1 in
The average liquid-equivalent 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.

Sun

The length of the day at Nantucket Memorial Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 12 minutes of daylight; the longest day is June 21, with 15 hours, 9 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Nantucket Memorial AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 9 minMar 2012 hr, 9 minMar 2015 hr, 9 minJun 2115 hr, 9 minJun 2112 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 12 minDec 219 hr, 12 minDec 21nightnightday
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.

The earliest sunrise is at 5:06 AM on June 14, and the latest sunrise is 2 hours, 7 minutes later at 7:13 AM on November 3. The earliest sunset is at 4:11 PM on December 8, and the latest sunset is 4 hours, 6 minutes later at 8:17 PM on June 27.

Daylight saving time (DST) is observed at Nantucket Memorial Airport during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Nantucket Memorial AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:06 AMJun 145:06 AM8:17 PMJun 278:17 PMJun 27Dec 84:11 PMDec 84:11 PM7:13 AMNov 37:13 AMNov 3Mar 11DSTMar 11DSTDSTNov 4DSTNov 4daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. 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.

Humidity

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.

Nantucket Memorial Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.0 months, from June 24 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 13% of the time. The muggiest day of the year is August 2, with muggy conditions 52% of the time.

The least muggy day of the year is December 12, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Nantucket Memorial AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 120%Dec 120%Aug 252%Aug 252%Jun 2413%Jun 2413%Sep 2413%Sep 2413%muggymuggydrydryhumidhumidoppressiveoppressivecomfortablecomfortable
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.

Wind

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 Nantucket Memorial Airport experiences extreme seasonal variation over the course of the year.

The windier part of the year lasts for 6.3 months, from October 10 to April 20, with average wind speeds of more than 15.4 miles per hour. The windiest day of the year is January 13, with an average hourly wind speed of 19.5 miles per hour.

The calmer time of year lasts for 5.7 months, from April 20 to October 10. The calmest day of the year is July 26, with an average hourly wind speed of 11.4 miles per hour.

Average Wind Speed

Average Wind Speed at Nantucket Memorial AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph5 mph10 mph15 mph20 mph25 mph30 mphJan 1319.5 mphJan 1319.5 mphJul 2611.4 mphJul 2611.4 mphOct 1015.4 mphOct 1015.4 mphApr 2015.4 mphApr 2015.4 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Nantucket Memorial Airport varies throughout the year.

The wind is most often from the south for 2.9 months, from June 23 to September 20, with a peak percentage of 41% on July 14. The wind is most often from the west for 9.1 months, from September 20 to June 23, with a peak percentage of 45% on January 1.

Wind Direction

Wind Direction at Nantucket Memorial AirportWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
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).

Water Temperature

Nantucket Memorial Airport 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 July 1 to October 1, with an average temperature above 62°F. The day of the year with the warmest water is August 13, with an average temperature of 67°F.

The time of year with cooler water lasts for 3.9 months, from December 28 to April 25, with an average temperature below 45°F. The day of the year with the coolest water is February 28, with an average temperature of 39°F.

Average Water Temperature

Average Water Temperature at Nantucket Memorial AirportwarmcoolJanFebMarAprMayJunJulAugSepOctNovDec35°F40°F45°F50°F55°F60°F65°F70°F75°FAug 1367°FAug 1367°F39°FFeb 2839°FFeb 28Jul 162°FJul 162°FOct 162°FOct 162°FDec 2845°FDec 2845°FApr 2545°FApr 2545°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Best Time of Year to Visit

To characterize how pleasant the weather is at Nantucket Memorial Airport 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 Nantucket Memorial Airport for general outdoor tourist activities is from late June to late September, with a peak score in the second week of August.

Tourism Score

Tourism Score at Nantucket Memorial Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.47.40.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturetourism 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 Nantucket Memorial Airport for hot-weather activities is from mid July to late August, with a peak score in the first week of August.

Beach/Pool Score

Beach/Pool Score at Nantucket Memorial AirportJanFebMarAprMayJunJulAugSepOctNovDec02468105.35.30.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/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.

Growing Season

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 Nantucket Memorial Airport typically lasts for 7.1 months (218 days), from around April 8 to around November 12, rarely starting before March 22 or after April 27, and rarely ending before October 26 or after November 30.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Nantucket Memorial Airportgrowing 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 1250%Nov 1290%Apr 2790%Apr 2790%Oct 2690%Oct 2610%Mar 2210%Mar 2210%Nov 3010%Nov 300%Feb 40%Feb 4Aug 2100%Aug 2100%freezingvery coldcoldcoolcomfortable
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 Nantucket Memorial Airport should appear around May 19, only rarely appearing before May 12 or after May 27.

Growing Degree Days

Growing Degree Days at Nantucket Memorial AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°FMay 1990°FMay 1990°FJul 22900°FJul 22900°FSep 101,800°FSep 101,800°FDec 312,347°FDec 312,347°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 8 to August 17, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is June 30, with an average of 7.1 kWh.

The darker period of the year lasts for 3.3 months, from November 4 to February 14, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest day of the year is December 26, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Nantucket Memorial AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 307.1 kWhJun 307.1 kWhDec 261.7 kWhDec 261.7 kWhMay 86.0 kWhMay 86.0 kWhAug 176.0 kWhAug 176.0 kWhFeb 142.8 kWhFeb 142.8 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Nantucket Memorial Airport are 41.257 deg latitude, -70.059 deg longitude, and 20 ft elevation.

The topography within 2 miles of Nantucket Memorial Airport is essentially flat, with a maximum elevation change of 85 feet and an average elevation above sea level of 30 feet. Within 10 miles is also essentially flat (92 feet). Within 50 miles is essentially flat (289 feet).

The area within 2 miles of Nantucket Memorial Airport is covered by trees (34%), artificial surfaces (30%), water (17%), and cropland (17%), within 10 miles by water (86%), and within 50 miles by water (93%).

Data Sources

This report illustrates the typical weather at Nantucket Memorial Airport, 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

Nantucket Memorial Airport 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 Chatham Municipal Airport, Barnstable Municipal Airport-Boardman/Polando Field, Martha's Vineyard Airport, Camp Edwards Heliport, Provincetown Municipal Airport, Plymouth Municipal Airport, New Bedford Regional Airport, and Marshfield 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 Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.