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Average Weather at Melfa / Accomack Airport Virginia, United States

At Melfa / Accomack Airport, the summers are hot and muggy, the winters are very cold and windy, and it is wet and partly cloudy year round. Over the course of the year, the temperature typically varies from 31°F to 88°F and is rarely below 19°F or above 95°F.

Climate Summary

coldcoolwarmhotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec65%65%50%50%clearovercastprecipitation: 4.1 inprecipitation: 4.1 in3.0 in3.0 inmuggy: 83%muggy: 83%0%0%drydrytourism score: 6.5tourism score: 6.50.60.6
Click on each chart for more information.

Based on the tourism score, the best times of year to visit Melfa / Accomack Airport for warm-weather activities are from mid May to mid June and from late August to mid October.

Temperature

The hot season lasts for 3.6 months, from May 31 to September 17, with an average daily high temperature above 80°F. The hottest day of the year is July 21, with an average high of 88°F and low of 71°F.

The cold season lasts for 3.2 months, from December 5 to March 11, with an average daily high temperature below 55°F. The coldest day of the year is January 29, with an average low of 31°F and high of 46°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 Melfa / Accomack AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMvery coldcoldcoldcoolcoolcomfortablewarmhotvery coldvery cold
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Thessaloníki, Greece (4,988 miles away) and Boradigah, Azerbaijan (6,086 miles) are the far-away foreign places with temperatures most similar to Melfa / Accomack Airport (view comparison).

Clouds

At Melfa / Accomack 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 Melfa / Accomack Airport begins around July 21 and lasts for 4.0 months, ending around November 23. On October 9, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 35% of the time.

The cloudier part of the year begins around November 23 and lasts for 8.0 months, ending around July 21. On December 26, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.

Cloud Cover Categories

Cloud Cover Categories at Melfa / Accomack AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Oct 965%Oct 965%Dec 2650%Dec 2650%Jul 2157%Jul 2157%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

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

The wetter season lasts 3.2 months, from May 21 to August 27, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 42% on August 6.

The drier season lasts 8.8 months, from August 27 to May 21. The smallest chance of a wet day is 22% on October 20.

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 42% on August 6.

Daily Chance of Precipitation

Daily Chance of Precipitation at Melfa / Accomack AirportwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 642%Aug 642%Oct 2022%Oct 2022%Jan 127%Jan 127%May 2132%May 2132%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. Melfa / Accomack Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Melfa / Accomack Airport. The most rain falls during the 31 days centered around August 11, with an average total accumulation of 4.1 inches.

The least rain falls around January 30, with an average total accumulation of 2.8 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. Melfa / Accomack Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 3.0 months, from December 12 to March 10, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 30, with an average total liquid-equivalent accumulation of 0.3 inches.

The snowless period of the year lasts for 9.0 months, from March 10 to December 12. The least snow falls around July 28, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Melfa / Accomack AirportsnowJanFebMarAprMayJunJulAugSepOctNovDec0 in1 in2 in3 in4 inJan 300.3 inJan 300.3 inJul 280.0 inJul 280.0 inDec 120.1 inDec 120.1 inMar 100.1 inMar 100.1 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 Melfa / Accomack Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 34 minutes of daylight; the longest day is June 21, with 14 hours, 46 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Melfa / Accomack AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 2012 hr, 8 minMar 2014 hr, 46 minJun 2114 hr, 46 minJun 2112 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 34 minDec 219 hr, 34 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 5:40 AM on June 13, and the latest sunrise is 1 hour, 49 minutes later at 7:30 AM on November 3. The earliest sunset is at 4:44 PM on December 6, and the latest sunset is 3 hours, 44 minutes later at 8:28 PM on June 28.

Daylight saving time (DST) is observed at Melfa / Accomack 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 Melfa / Accomack AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:40 AMJun 135:40 AM8:28 PMJun 288:28 PMJun 28Dec 64:44 PMDec 64:44 PM7:30 AMNov 37:30 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.

Melfa / Accomack Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.6 months, from May 20 to October 7, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The muggiest day of the year is August 2, with muggy conditions 83% of the time.

The least muggy day of the year is January 24, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Melfa / Accomack AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 240%Jan 240%83%Aug 283%Aug 2May 2021%May 2021%Oct 721%Oct 721%miserablemiserableoppressiveoppressivehumidhumiddrydrymuggymuggycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 Melfa / Accomack Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.2 months, from September 30 to May 6, with average wind speeds of more than 11.9 miles per hour. The windiest day of the year is January 18, with an average hourly wind speed of 14.3 miles per hour.

The calmer time of year lasts for 4.8 months, from May 6 to September 30. The calmest day of the year is July 26, with an average hourly wind speed of 9.4 miles per hour.

Average Wind Speed

Average Wind Speed at Melfa / Accomack AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mphJan 1814.3 mphJan 1814.3 mphJul 269.4 mphJul 269.4 mphSep 3011.9 mphSep 3011.9 mphMay 611.9 mphMay 611.9 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 Melfa / Accomack Airport varies throughout the year.

The wind is most often from the south for 5.7 months, from March 31 to September 22, with a peak percentage of 45% on July 14. The wind is most often from the north for 6.3 months, from September 22 to March 31, with a peak percentage of 38% on January 1.

Wind Direction

Wind Direction at Melfa / Accomack AirportNSNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 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

Melfa / Accomack 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 3.5 months, from June 17 to October 2, with an average temperature above 70°F. The day of the year with the warmest water is August 4, with an average temperature of 78°F.

The time of year with cooler water lasts for 3.5 months, from December 21 to April 6, with an average temperature below 49°F. The day of the year with the coolest water is February 12, with an average temperature of 41°F.

Average Water Temperature

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 Melfa / Accomack 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 times of year to visit Melfa / Accomack Airport for general outdoor tourist activities are from mid May to mid June and from late August to mid October, with a peak score in the third week of September.

Tourism Score

Tourism Score at Melfa / Accomack Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.56.50.60.66.16.14.84.8 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 Melfa / Accomack Airport for hot-weather activities is from mid June to mid September, with a peak score in the last week of August.

Beach/Pool Score

Beach/Pool Score at Melfa / Accomack Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.06.00.00.05.95.9 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 Melfa / Accomack Airport typically lasts for 7.5 months (228 days), from around March 29 to around November 12, rarely starting before March 12 or after April 15, and rarely ending before October 24 or after December 2.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Melfa / Accomack Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Mar 2950%Mar 2950%Nov 1250%Nov 1290%Apr 1590%Apr 1590%Oct 2490%Oct 2410%Mar 1210%Mar 1210%Dec 210%Dec 20%Jan 270%Jan 27Jul 18100%Jul 18100%very coldcoldcomfortablewarmhotcoolfreezing
The percentage of time spent in various temperature bands: 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 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 Melfa / Accomack Airport should appear around March 6, only rarely appearing before February 10 or after March 30.

Growing Degree Days

Growing Degree Days at Melfa / Accomack AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°F4,500°FMar 682°FMar 682°FMay 31900°FMay 31900°FJul 71,800°FJul 71,800°FDec 314,500°FDec 314,500°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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.8 months, from April 22 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 23, with an average of 7.0 kWh.

The darker period of the year lasts for 3.1 months, from November 7 to February 9, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest day of the year is December 24, with an average of 2.2 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Melfa / Accomack AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJun 237.0 kWhJun 237.0 kWhDec 242.2 kWhDec 242.2 kWhApr 226.0 kWhApr 226.0 kWhAug 176.0 kWhAug 176.0 kWhNov 73.1 kWhNov 73.1 kWhFeb 93.1 kWhFeb 93.1 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 Melfa / Accomack Airport are 37.650 deg latitude, -75.767 deg longitude, and 33 ft elevation.

The topography within 2 miles of Melfa / Accomack Airport is essentially flat, with a maximum elevation change of 49 feet and an average elevation above sea level of 33 feet. Within 10 miles is also essentially flat (56 feet). Within 50 miles is essentially flat (177 feet).

The area within 2 miles of Melfa / Accomack Airport is covered by cropland (54%) and trees (40%), within 10 miles by water (35%) and cropland (29%), and within 50 miles by water (72%) and trees (15%).

Data Sources

This report illustrates the typical weather at Melfa / Accomack 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

Melfa / Accomack 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 Wallops Flight Facility; Salisbury–Ocean City–Wicomico Regional Airport; Langley Air Force Base; Webster Nolf Airport; Norfolk International Airport; Virginia Beach, Oceana, Naval Air Station; Naval Station Norfolk Chambers Field; and Newport News-Williamsburg International 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.