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%.
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!
In Louisville in December, the precipitation amount is 19 mm (0.8 in) over a span of 4 days.
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.
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.
UV Risk Categories
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.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
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 Weather | 2°C (35°F) | 62 mm (2.5 inches) | 81% | very high |
April Weather | 5°C (42°F) | 68 mm (2.7 inches) | 76% | extreme |
May Weather | 10°C (50°F) | 134 mm (5.3 inches) | 66% | extreme |
June Weather | 17°C (63°F) | 74 mm (2.9 inches) | 58% | extreme |
July Weather | 20°C (68°F) | 71 mm (2.8 inches) | 52% | extreme |
August Weather | 19°C (67°F) | 67 mm (2.7 inches) | 56% | extreme |
September Weather | 16°C (61°F) | 42 mm (1.6 inches) | 65% | very high |
October Weather | 7°C (45°F) | 48 mm (1.9 inches) | 76% | high |
November Weather | 2°C (36°F) | 30 mm (1.2 inches) | 82% | moderate |
December Weather | -2°C (29°F) | 19 mm (0.8 inches) | 89% | moderate |