Average Weather in January in Tompkinsville Kentucky, United States
In Tompkinsville, the month of January is characterized by essentially constant daily high temperatures, with daily highs around 45°F throughout the month, rarely exceeding 62°F or dropping below 29°F. The lowest daily average high temperature is 45°F on January 16.
Daily low temperatures are around 29°F, rarely falling below 13°F or exceeding 47°F. The lowest daily average low temperature is 28°F on January 29.
For reference, on July 21, the hottest day of the year, temperatures in Tompkinsville typically range from 67°F to 86°F, while on January 29, the coldest day of the year, they range from 28°F to 45°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January in Tompkinsville experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 57% throughout the month. The highest chance of overcast or mostly cloudy conditions is 58% on January 3.
The clearest day of the month is January 29, with clear, mostly clear, or partly cloudy conditions 44% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on September 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Tompkinsville, the chance of a wet day over the course of January is essentially constant, remaining around 28% throughout.
For reference, the year's highest daily chance of a wet day is 43% on June 30, and its lowest chance is 25% on October 12.
Over the course of January in Tompkinsville, the chance of a day with only rain remains an essentially constant 22% throughout, the chance of a day with mixed snow and rain remains an essentially constant 4% throughout, and the chance of a day with only snow increases from 1% to 3%.
Probability of Precipitation in January
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during January in Tompkinsville is essentially constant, remaining about 3.5 inches throughout, and rarely exceeding 6.1 inches or falling below 1.2 inches.
The lowest average 31-day accumulation is 3.4 inches on January 16.
Average Monthly Rainfall in January
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. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January in Tompkinsville is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.8 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.3 inches on January 30.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Tompkinsville, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 40 minutes, implying an average daily increase of 1 minute, 20 seconds, and weekly increase of 9 minutes, 18 seconds.
The shortest day of the month is January 1, with 9 hours, 43 minutes of daylight and the longest day is January 31, with 10 hours, 22 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Tompkinsville is 6:55 AM on January 5 and the earliest sunrise is 10 minutes earlier at 6:45 AM on January 31.
The earliest sunset is 4:37 PM on January 1 and the latest sunset is 30 minutes later at 5:07 PM on January 31.
Daylight saving time is observed in Tompkinsville during 2017, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:24 AM and sets 14 hours, 41 minutes later, at 8:04 PM, while on December 21, the shortest day of the year, it rises at 6:51 AM and sets 9 hours, 39 minutes later, at 4:30 PM.
Sunrise & Sunset with Twilight in January
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.
The chance that a given day will be muggy in Tompkinsville is essentially constant during January, remaining around 0% throughout.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 79% of the time, while on January 14, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
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 Tompkinsville is essentially constant during January, remaining within 0.1 miles per hour of 3.9 miles per hour throughout.
For reference, on February 25, the windiest day of the year, the daily average wind speed is 4.1 miles per hour, while on July 30, the calmest day of the year, the daily average wind speed is 2.3 miles per hour.
Average Wind Speed in January
Wind Direction in January
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 in Tompkinsville is gradually increasing during January, rising by 0.6 kWh, from 2.2 kWh to 2.8 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Tompkinsville are 36.702 deg latitude, -85.692 deg longitude, and 925 ft elevation.
The topography within 2 miles of Tompkinsville contains only modest variations in elevation, with a maximum elevation change of 295 feet and an average elevation above sea level of 928 feet. Within 10 miles contains only modest variations in elevation (630 feet). Within 50 miles contains significant variations in elevation (1,647 feet).
The area within 2 miles of Tompkinsville is covered by cropland (77%), trees (12%), and artificial surfaces (11%), within 10 miles by cropland (57%) and trees (42%), and within 50 miles by trees (48%) and cropland (48%).
This report illustrates the typical weather in Tompkinsville year round, 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 Tompkinsville.
For each station, the records are corrected for the elevation difference between that station and Tompkinsville 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 Tompkinsville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Tompkinsville and a given station.
The stations contributing to this reconstruction are: Glasgow Municipal Airport (51%, 43 kilometers, northwest); Wayne County Airport (22%, 76 kilometers, east); Crossville Memorial Airport (14%, 100 kilometers, southeast); and Smyrna Airport (13%, 107 kilometers, southwest).
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.