Last updated: June 24, 2025
In December, the average temperature in Jefferson City, United States hovers around 4°C (40°F). However, be prepared for a range in temperatures: it can dip as low as -15°C (5°F) and soar up to 24°C (76°F). Expect 41 mm (1.6 in) of precipitation spread over 6 rainy days, contributing to a high average humidity of 86%. Plan accordingly to embrace the weather!
In December in Jefferson City, the average temperature is 4°C (40°F). Maximum temperatures can reach 24°C (76°F), while minimums can drop as low as -15°C (4°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Jefferson City in December, the precipitation amount is 41 mm (1.6 in) over the course of 6 days.
In Jefferson City in December humidity is 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.
In Jefferson City in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Jefferson City, you can check the information here.
UV Risk Categories
Weather in Jefferson City varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Jefferson City, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (33°F) | 70 mm (2.8 inches) | 82% | moderate |
| February Weather | 2°C (36°F) | 65 mm (2.6 inches) | 80% | moderate |
| March Weather | 9°C (48°F) | 120 mm (4.7 inches) | 80% | high |
| April Weather | 13°C (55°F) | 124 mm (4.9 inches) | 80% | very high |
| May Weather | 19°C (67°F) | 163 mm (6.4 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 95 mm (3.7 inches) | 83% | extreme |
| July Weather | 26°C (80°F) | 108 mm (4.3 inches) | 81% | extreme |
| August Weather | 25°C (77°F) | 94 mm (3.7 inches) | 80% | very high |
| September Weather | 22°C (73°F) | 56 mm (2.2 inches) | 76% | very high |
| October Weather | 15°C (59°F) | 99 mm (3.9 inches) | 76% | high |
| November Weather | 7°C (45°F) | 59 mm (2.3 inches) | 85% | moderate |
| December Weather | 4°C (40°F) | 41 mm (1.6 inches) | 86% | moderate |