Last updated: June 24, 2025
In Rockford, United States, the average temperature in December hovers around 0°C (32°F). Expect chilly conditions, with a minimum plunging to -28°C (-18°F) and a maximum reaching 17°C (62°F). This month also brings about 67 mm (2.7 in) of precipitation over roughly 11 days, accompanied by a high average humidity of 86%. Prepare accordingly for a noteworthy winter experience!
In December in Rockford, the average temperature is 0°C (32°F). Maximums can reach 17°C (62°F), while minimums can drop as low as -28°C (-18°F). Be prepared for a wide range of temperatures when traveling during this time.
In Rockford in December, the total precipitation amount is 67 mm (2.7 in) spread over a duration of 11 days.
In Rockford in December humidity is 86%. With an average temperature of 0°C (32°F), this humidity feels like a biting chill that seeps into your bones, making travel feel uncomfortable and damp, as the cold air combines with the moisture to create a brisk sensation that may deter outdoor exploration.
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 | -4°C (26°F) | 64 mm (2.5 inches) | 87% | low |
| February Weather | -3°C (27°F) | 69 mm (2.7 inches) | 87% | moderate |
| March Weather | 2°C (37°F) | 67 mm (2.7 inches) | 86% | moderate |
| April Weather | 8°C (47°F) | 87 mm (3.4 inches) | 87% | very high |
| May Weather | 15°C (60°F) | 139 mm (5.5 inches) | 82% | very high |
| June Weather | 21°C (70°F) | 124 mm (4.9 inches) | 81% | very high |
| July Weather | 24°C (75°F) | 70 mm (2.7 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 78 mm (3.1 inches) | 79% | very high |
| September Weather | 18°C (65°F) | 115 mm (4.5 inches) | 79% | high |
| October Weather | 11°C (53°F) | 132 mm (5.2 inches) | 82% | moderate |
| November Weather | 3°C (38°F) | 63 mm (2.5 inches) | 87% | moderate |
| December Weather | 0°C (32°F) | 67 mm (2.7 inches) | 86% | low |