Average Weather in Summersville West Virginia, United States

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3. West Virginia
4. Nicholas County
5. Summersville

In Summersville, the summers are long, warm, and wet; the winters are short and chilly; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 24°F to 81°F and is rarely below 9°F or above 87°F.

The warm season lasts for 3.9 months, from May 23 to September 20, with an average daily high temperature above 72°F. The hottest day of the year is July 21, with an average high of 81°F and low of 64°F.

The cold season lasts for 3.0 months, from December 2 to March 1, with an average daily high temperature below 48°F. The coldest day of the year is January 29, with an average low of 24°F and high of 39°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 Summersville, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Summersville begins around June 2 and lasts for 5.4 months, ending around November 15. On August 29, 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 15 and lasts for 6.6 months, ending around June 2. On January 11, the cloudiest day of the year, the sky is overcast or mostly cloudy 67% of the time, and clear, mostly clear, or partly cloudy 33% 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 Summersville varies throughout the year.

The wetter season lasts 4.9 months, from March 25 to August 21, with a greater than 34% chance of a given day being a wet day. The chance of a wet day peaks at 44% on May 29.

The drier season lasts 7.1 months, from August 21 to March 25. The smallest chance of a wet day is 25% on October 25.

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 44% on May 29.

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. Summersville experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Summersville. The most rain falls during the 31 days centered around July 10, with an average total accumulation of 3.8 inches.

The least rain falls around January 22, with an average total accumulation of 1.9 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. Summersville experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.3 months, from November 20 to March 30, 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 11, with an average total liquid-equivalent accumulation of 0.4 inches.

The snowless period of the year lasts for 7.7 months, from March 30 to November 20. The least snow falls around July 27, with an average total liquid-equivalent accumulation of 0.0 inches.

The length of the day in Summersville varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 30 minutes of daylight; the longest day is June 21, with 14 hours, 50 minutes of daylight.

The earliest sunrise is at 5:59 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 7:53 AM on November 4. The earliest sunset is at 5:02 PM on December 7, and the latest sunset is 3 hours, 48 minutes later at 8:50 PM on June 28.

Daylight saving time (DST) is observed in Summersville 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.

Summersville experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.3 months, from June 5 to September 15, 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 24, with muggy conditions 49% of the time.

The least muggy day of the year is November 28, 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 Summersville experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.6 months, from November 12 to April 29, with average wind speeds of more than 2.6 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 3.5 miles per hour.

The calmer time of year lasts for 6.4 months, from April 29 to November 12. The calmest day of the year is August 1, with an average hourly wind speed of 1.7 miles per hour.

The predominant average hourly wind direction in Summersville varies throughout the year.

The wind is most often from the south for 2.2 months, from August 20 to October 27 and for 2.3 weeks, from November 3 to November 19, with a peak percentage of 39% on November 18. The wind is most often from the west for 1.0 weeks, from October 27 to November 3 and for 9.0 months, from November 19 to August 20, with a peak percentage of 37% on October 29.

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 4.1 months, from April 29 to September 2, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is July 2, with an average of 6.8 kWh.

The darker period of the year lasts for 3.1 months, from November 8 to February 12, 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 Summersville are 38.281 deg latitude, -80.853 deg longitude, and 1,900 ft elevation.

The topography within 2 miles of Summersville contains very significant variations in elevation, with a maximum elevation change of 886 feet and an average elevation above sea level of 1,947 feet. Within 10 miles also contains very significant variations in elevation (1,837 feet). Within 50 miles contains very significant variations in elevation (4,278 feet).

The area within 2 miles of Summersville is covered by trees (77%) and artificial surfaces (16%), within 10 miles by trees (90%), and within 50 miles by trees (95%).

This report illustrates the typical weather in Summersville, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Summersville.

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

The stations contributing to this reconstruction are: Raleigh County Memorial Airport (26%, 60 kilometers, southwest); Greenbrier Valley Airport (27%, 61 kilometers, southeast); Yeager Airport (22%, 65 kilometers, west); Upshur County Regional Airport (14%, 95 kilometers, northeast); and Wood County Airport (11%, 109 kilometers, north).

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.