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December Weather in Louisville, United States

Last updated: June 24, 2025

In Louisville, United States, the average temperature in December hovers around -2°C (29°F), with fluctuations that can range from a chilly -19°C (-1°F) to a surprisingly warm 19°C (67°F). Expect 19 mm (0.8 in) of precipitation spread over 4 days, contributing to an average humidity level of 89%.

December Temperature in Louisville

In December, in Louisville, the average temperature is -2°C (29°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -19°C (-1°F). Be prepared for a wide range of temperatures during your travels!

December Weather in Louisville: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Louisville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Louisville, December typically has an average temperature of -2°C (29°F), with highs reaching up to 19°C (67°F) and lows dropping to around -19°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec262535425063686661443629
Data source: Temperature data for Louisville generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Louisville

In Louisville in December, the precipitation amount is 19 mm (0.8 in) over a span of 4 days.

December Precipitation Trends in Louisville

The chart displays monthly precipitation patterns in Louisville, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Louisville, December typically receives around 19 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec2536636813474716842483020
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Louisville

In Louisville in December humidity is 89%. With an average temperature of -2°C (29°F), this humidity feels like a suffocating fog that clings to your skin, making outdoor adventures less enjoyable and giving travel a heavy and oppressive feel.

December Average Humidity in Louisville

This chart illustrates the average monthly humidity levels in Louisville, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Louisville is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%76%67%58%52%56%65%76%82%89%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Louisville

In Louisville in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Louisville for better planning.

Maximum UV Index Levels in Louisville for December

The chart shows the monthly maximum UV Index (UVI) for Louisville in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Louisville typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111112121110754
Data source: Louisville December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Louisville Compares to Other Months

Weather in Louisville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Louisville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Louisville, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)25 mm (1.0 inches)88%moderate
February Weather-4°C (26°F)36 mm (1.4 inches)87%high
March Weather2°C (35°F)62 mm (2.5 inches)81%very high
April Weather5°C (42°F)68 mm (2.7 inches)76%extreme
May Weather10°C (50°F)134 mm (5.3 inches)66%extreme
June Weather17°C (63°F)74 mm (2.9 inches)58%extreme
July Weather20°C (68°F)71 mm (2.8 inches)52%extreme
August Weather19°C (67°F)67 mm (2.7 inches)56%extreme
September Weather16°C (61°F)42 mm (1.6 inches)65%very high
October Weather7°C (45°F)48 mm (1.9 inches)76%high
November Weather2°C (36°F)30 mm (1.2 inches)82%moderate
December Weather-2°C (29°F)19 mm (0.8 inches)89%moderate

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