Average Weather in December in Louisville Kentucky, United States
In Louisville, the month of December is characterized by falling daily high temperatures, with daily highs decreasing by 7°F, from 51°F to 44°F over the course of the month, and rarely exceeding 66°F or dropping below 28°F.
Daily low temperatures decrease by 6°F, from 36°F to 30°F, rarely falling below 14°F or exceeding 51°F.
For reference, on July 21, the hottest day of the year, temperatures in Louisville typically range from 71°F to 88°F, while on January 29, the coldest day of the year, they range from 28°F to 43°F.
Average High and Low Temperature in December
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December
The month of December in Louisville experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 52% to 57%.
The clearest day of the month is December 2, with clear, mostly clear, or partly cloudy conditions 48% of the time.
For reference, on January 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on August 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.
Cloud Cover in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Louisville, the chance of a wet day over the course of December is essentially constant, remaining around 28% throughout.
For reference, the year's highest daily chance of a wet day is 40% on June 8, and its lowest chance is 23% on January 14.
Over the course of December in Louisville, the chance of a day with only rain decreases from 26% to 22%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Louisville is decreasing, starting the month at 3.6 inches, when it rarely exceeds 6.0 inches or falls below 1.7 inches, and ending the month at 3.0 inches, when it rarely exceeds 5.1 inches or falls below 0.8 inches.
The highest average 31-day accumulation is 3.6 inches on December 1.
Average Monthly Rainfall in December
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 December in Louisville is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.7 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Louisville, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 30 minutes of daylight and the longest day is December 1, with 9 hours, 42 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Louisville is 7:41 AM on December 1 and the latest sunrise is 19 minutes later at 7:59 AM on December 31.
The earliest sunset is 5:22 PM on December 6 and the latest sunset is 10 minutes later at 5:32 PM on December 31.
Daylight saving time is observed in Louisville during 2017, but it neither starts nor ends during December, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:19 AM and sets 14 hours, 50 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:56 AM and sets 9 hours, 30 minutes later, at 5:26 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Louisville is essentially constant during December, remaining around 0% throughout.
For reference, on July 24, the muggiest day of the year, there are muggy conditions 67% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in December
The average hourly wind speed in Louisville is essentially constant during December, remaining within 0.2 miles per hour of 4.4 miles per hour throughout.
For reference, on February 25, the windiest day of the year, the daily average wind speed is 4.8 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 2.7 miles per hour.
Average Wind Speed in December
Wind Direction in December
The average daily incident shortwave solar energy in Louisville is essentially constant during December, remaining within 0.1 kWh of 2.1 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.0 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Louisville are 38.254 deg latitude, -85.759 deg longitude, and 453 ft elevation.
The topography within 2 miles of Louisville contains only modest variations in elevation, with a maximum elevation change of 115 feet and an average elevation above sea level of 446 feet. Within 10 miles contains only modest variations in elevation (620 feet). Within 50 miles also contains significant variations in elevation (810 feet).
The area within 2 miles of Louisville is covered by artificial surfaces (88%) and water (12%), within 10 miles by artificial surfaces (66%) and trees (21%), and within 50 miles by trees (48%) and cropland (45%).
This report illustrates the typical weather in Louisville 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 Louisville.
For each station, the records are corrected for the elevation difference between that station and Louisville 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 Louisville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Louisville and a given station.
The stations contributing to this reconstruction are: Standiford Field (53%, 8 kilometers, south); Bowman Field (46%, 9 kilometers, east); Monroe County Airport (0.9%, 123 kilometers, northwest); and Shelbyville Municipal Airport (0.7%, 147 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .