Last updated: June 24, 2025
In December, the average temperature in Rockford, United States hovers around 2°C (35°F). Be prepared for a chill, as temperatures can dip to a frigid -22°C (-7°F), while occasionally reaching a mild 17°C (63°F). This time of year sees about 64 mm (2.5 in) of precipitation spread over 9 days, making the atmosphere quite humid with an average humidity of 86%. 🌧️
In December in Rockford, the average temperature is 2°C (35°F), with maximums reaching up to 17°C (63°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warmer and colder conditions.
In Rockford in December, the precipitation amount is 64 mm (2.5 in) over a span of 9 days.
In Rockford in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.
In Rockford 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 Rockford, you can visit Hourly UV Index in Rockford.
UV Risk Categories
Weather in Rockford varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rockford, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 75 mm (2.9 inches) | 88% | moderate |
| February Weather | 0°C (32°F) | 84 mm (3.3 inches) | 87% | moderate |
| March Weather | 5°C (41°F) | 100 mm (3.9 inches) | 87% | high |
| April Weather | 10°C (51°F) | 92 mm (3.6 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 128 mm (5.1 inches) | 81% | very high |
| June Weather | 22°C (73°F) | 123 mm (4.9 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 109 mm (4.3 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 103 mm (4.0 inches) | 78% | very high |
| September Weather | 20°C (69°F) | 70 mm (2.8 inches) | 78% | very high |
| October Weather | 14°C (57°F) | 93 mm (3.7 inches) | 82% | high |
| November Weather | 5°C (42°F) | 83 mm (3.3 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 64 mm (2.5 inches) | 86% | low |