Average Weather at Wallops Flight Facility Virginia, United States
At Wallops Flight Facility, the temperature typically varies from 29°F to 85°F over the course of the year, and is rarely below 17°F or above 92°F.
The hot season lasts for 3.6 months, from June 2 to September 20, with an average daily high temperature above 77°F. The hottest day of the year is July 21, with an average high of 85°F and low of 71°F.
The cold season lasts for 3.3 months, from December 5 to March 13, with an average daily high temperature below 53°F. The coldest day of the year is January 29, with an average low of 29°F and high of 45°F.
Average High and Low Temperature
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
The length of the day at Wallops Flight Facility varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 32 minutes of daylight; the longest day is June 21, with 14 hours, 48 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:38 AM on June 13, and the latest sunrise is 1 hour, 52 minutes later at 7:30 AM on November 4. The earliest sunset is at 4:42 PM on December 6, and the latest sunset is 3 hours, 46 minutes later at 8:28 PM on June 28.
Daylight saving time (DST) is observed at Wallops Flight Facility during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
At Wallops Flight Facility, 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 Wallops Flight Facility begins around July 19 and lasts for 4.0 months, ending around November 20. On October 12, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.
The cloudier part of the year begins around November 20 and lasts for 8.0 months, ending around July 19. On January 5, the cloudiest day of the year, the sky is overcast or mostly cloudy 51% of the time, and clear, mostly clear, or partly cloudy 49% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Wallops Flight Facility varies throughout the year.
The wetter season lasts 3.0 months, from May 22 to August 22, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 41% on August 6.
The drier season lasts 9.0 months, from August 22 to May 22. 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 41% on August 6.
Daily Chance of Precipitation
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 in the year. Wallops Flight Facility experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year at Wallops Flight Facility. The most rain falls during the 31 days centered around August 11, with an average total accumulation of 3.9 inches.
The least rain falls around January 31, with and average total accumulation of 2.7 inches.
Average Monthly Rainfall
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 in the year. Wallops Flight Facility experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.1 months, from December 11 to March 13, 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 8.9 months, from March 13 to December 11. The least snow falls around August 2, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
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.
Wallops Flight Facility experiences very significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.4 months, from May 25 to October 6, during which time the comfort level is muggy, oppressive, or miserable at least 20% of the time. The muggiest day of the year is August 2, with muggy conditions 80% of the time.
The least muggy day of the year is January 29, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 Wallops Flight Facility experiences mildly seasonal variation over the course of the year.
The windier part of the year lasts for 7.1 months, from October 4 to May 7, with average wind speeds of more than 6.4 miles per hour. The windiest day of the year is January 13, with an average hourly wind speed of 7.8 miles per hour.
The calmer time of year lasts for 4.9 months, from May 7 to October 4. The calmest day of the year is July 26, with an average hourly wind speed of 5.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Wallops Flight Facility varies throughout the year.
The wind is most often from the south for 5.8 months, from March 31 to September 25, with a peak percentage of 45% on July 14. The wind is most often from the north for 6.2 months, from September 25 to March 31, with a peak percentage of 40% on January 29.
Wallops Flight Facility 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 18 to October 3, with an average temperature above 70°F. The day of the year with the warmest water is August 5, with an average temperature of 77°F.
The time of year with cooler water lasts for 3.6 months, from December 22 to April 11, with an average temperature below 49°F. The day of the year with the coolest water is February 20, with an average temperature of 42°F.
Average Water Temperature
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 23 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 6 to February 10, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest day of the year is December 23, with an average of 2.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Wallops Flight Facility are 37.941 deg latitude, -75.467 deg longitude, and 16 ft elevation.
The topography within 2 miles of Wallops Flight Facility is essentially flat, with a maximum elevation change of 39 feet, and an average elevation above sea level of 15 feet. Within 10 miles is also essentially flat (49 feet). Within 50 miles contains only modest variations in elevation (128 feet).
The area within 2 miles of Wallops Flight Facility is covered by cropland (27%), artificial surfaces (27%), herbaceous vegetation (22%), and trees (18%), within 10 miles by water (35%) and cropland (27%), and within 50 miles by water (68%) and trees (13%).
This report illustrates the typical weather at Wallops Flight Facility, 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
Wallops Flight Facility 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 Salisbury–Ocean City–Wicomico Regional Airport, Melfa / Accomack Airport, Ocean City Municipal Airport, Sussex County Airport, Cambridge-Dorchester Airport, Webster Nolf Airport, Naval Air Station Patuxent River, and Easton Airport.
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 .