Last updated: June 24, 2025
In December, the average temperature in DeKalb, United States hovers around 0°C (32°F), with a chilly minimum of -22°C (-7°F) and a pleasant maximum of 19°C (67°F). Expect 49 mm (1.9 in) of precipitation spread over 7 days, while the average humidity sits at a cozy 84%, creating a uniquely crisp atmosphere.
In December in DeKalb, the average temperature is 0°C (32°F). Maximums can reach 19°C (67°F) and minimums can be as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm and cold conditions.
In DeKalb in December, the precipitation amount is 49 mm (1.9 in) over the course of 7 days.
In DeKalb in December, humidity is 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.
In DeKalb 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 DeKalb, you can visit Hourly UV Index in DeKalb.
UV Risk Categories
Weather in DeKalb varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in DeKalb, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (24°F) | 60 mm (2.4 inches) | 82% | moderate |
| February Weather | -4°C (26°F) | 58 mm (2.3 inches) | 83% | moderate |
| March Weather | 4°C (39°F) | 78 mm (3.1 inches) | 84% | high |
| April Weather | 9°C (48°F) | 111 mm (4.4 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 169 mm (6.7 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 128 mm (5.1 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 88 mm (3.5 inches) | 80% | very high |
| August Weather | 22°C (73°F) | 83 mm (3.3 inches) | 81% | very high |
| September Weather | 19°C (67°F) | 107 mm (4.2 inches) | 80% | very high |
| October Weather | 12°C (54°F) | 122 mm (4.8 inches) | 82% | high |
| November Weather | 3°C (38°F) | 52 mm (2.0 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 49 mm (1.9 inches) | 84% | low |