Average Weather in Fort Ashby West Virginia, United States

1. World
2. United States
3. West Virginia
4. Mineral County
5. Fort Ashby

In Fort Ashby, the summers are warm and humid, the winters are chilly, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 87°F and is rarely below 11°F or above 95°F.

The hot season lasts for 3.6 months, from May 29 to September 16, with an average daily high temperature above 78°F. The hottest day of the year is July 20, with an average high of 87°F and low of 65°F.

The cold season lasts for 3.2 months, from November 29 to March 4, with an average daily high temperature below 50°F. The coldest day of the year is January 29, with an average low of 25°F and high of 40°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.

In Fort Ashby, 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 Fort Ashby begins around June 27 and lasts for 4.3 months, ending around November 6. On September 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around November 6 and lasts for 7.7 months, ending around June 27. On January 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 53% of the time, and clear, mostly clear, or partly cloudy 47% 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 in Fort Ashby varies throughout the year.

The wetter season lasts 4.6 months, from March 31 to August 20, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 40% on June 16.

The drier season lasts 7.4 months, from August 20 to March 31. The smallest chance of a wet day is 19% on January 14.

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 40% on June 16.

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. Fort Ashby experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Fort Ashby. The most rain falls during the 31 days centered around May 19, with an average total accumulation of 3.4 inches.

The least rain falls around January 23, with an average total accumulation of 1.3 inches.

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. Fort Ashby experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.5 months, from November 15 to March 31, 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 0.8 inches.

The snowless period of the year lasts for 7.5 months, from March 31 to November 15. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.

The length of the day in Fort Ashby varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 23 minutes of daylight; the longest day is June 21, with 14 hours, 58 minutes of daylight.

The earliest sunrise is at 5:47 AM on June 14, and the latest sunrise is 1 hour, 60 minutes later at 7:46 AM on November 4. The earliest sunset is at 4:51 PM on December 7, and the latest sunset is 3 hours, 55 minutes later at 8:46 PM on June 27.

Daylight saving time (DST) is observed in Fort Ashby during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

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.

Fort Ashby experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.8 months, from May 27 to September 20, during which time the comfort level is muggy, oppressive, or miserable at least 13% of the time. The muggiest day of the year is July 20, with muggy conditions 49% of the time.

The least muggy day of the year is February 8, when muggy conditions are essentially unheard of.

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 Fort Ashby experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from November 16 to April 25, with average wind speeds of more than 2.7 miles per hour. The windiest day of the year is February 2, with an average hourly wind speed of 3.6 miles per hour.

The calmer time of year lasts for 6.7 months, from April 25 to November 16. The calmest day of the year is August 13, with an average hourly wind speed of 1.8 miles per hour.

The predominant average hourly wind direction in Fort Ashby is from the west throughout the year.

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 3.8 months, from April 30 to August 25, with an average daily incident shortwave energy per square meter above 5.9 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 3.2 months, from November 5 to February 10, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 25, with an average of 1.9 kWh.

For the purposes of this report, the geographical coordinates of Fort Ashby are 39.503 deg latitude, -78.769 deg longitude, and 794 ft elevation.

The topography within 2 miles of Fort Ashby contains only modest variations in elevation, with a maximum elevation change of 489 feet and an average elevation above sea level of 716 feet. Within 10 miles contains only modest variations in elevation (2,349 feet). Within 50 miles contains large variations in elevation (4,216 feet).

The area within 2 miles of Fort Ashby is covered by trees (68%) and cropland (25%), within 10 miles by trees (83%) and cropland (12%), and within 50 miles by trees (76%) and cropland (22%).

This report illustrates the typical weather in Fort Ashby, 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 Fort Ashby.

For each station, the records are corrected for the elevation difference between that station and Fort Ashby 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 Fort Ashby is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fort Ashby and a given station.

The stations contributing to this reconstruction are: Greater Cumberland Regional Airport (84%, 11 kilometers, north); Grant County Airport (6%, 65 kilometers, southwest); Winchester Regional Airport (5%, 67 kilometers, southeast); and Eastern West Virginia Regional Airport (5%, 68 kilometers, east).

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.