Last updated: June 24, 2025
The average temperature in Louisville, United States during December is a crisp 0°C (32°F). While the mercury can dip to a bone-chilling -25°C (-12°F), it may also rise to a pleasant 21°C (71°F). Expect 37 mm (1.5 in) of precipitation spread over approximately 4 days, and brace yourself for the high average humidity of 83%.
In December in Louisville, the average temperature is 0°C (32°F). The maximum can reach 21°C (71°F), and the minimum can be as low as -25°C (-12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Louisville in December, the precipitation amount is 37 mm (1.5 in) over the course of 4 days.
In Louisville in December, humidity is 83%. With an average temperature of 0°C (32°F), this humidity feels like traveling through a thick mist, making every step heavy and the cold pierce even deeper, causing you to constantly seek shelter or warm beverages to counteract the damp chill.
In Louisville in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Louisville, you can visit Hourly UV Index in Louisville.
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) | 33 mm (1.3 inches) | 76% | moderate |
| February Weather | -3°C (26°F) | 30 mm (1.2 inches) | 80% | moderate |
| March Weather | 5°C (42°F) | 99 mm (3.9 inches) | 73% | high |
| April Weather | 10°C (51°F) | 52 mm (2.0 inches) | 74% | very high |
| May Weather | 17°C (64°F) | 139 mm (5.5 inches) | 78% | very high |
| June Weather | 25°C (77°F) | 121 mm (4.8 inches) | 82% | very high |
| July Weather | 26°C (79°F) | 89 mm (3.5 inches) | 83% | very high |
| August Weather | 24°C (75°F) | 92 mm (3.6 inches) | 80% | very high |
| September Weather | 21°C (70°F) | 88 mm (3.5 inches) | 75% | very high |
| October Weather | 12°C (53°F) | 131 mm (5.2 inches) | 75% | high |
| November Weather | 5°C (41°F) | 30 mm (1.2 inches) | 82% | moderate |
| December Weather | 0°C (32°F) | 37 mm (1.5 inches) | 83% | low |