Last updated: June 24, 2025
In Rockford, United States, the average temperature in December hovers around 10°C (51°F). However, temperatures can dip as low as -6°C (22°F) and soar up to 25°C (77°F). Expect 140 mm (5.5 in) of precipitation over 13 days, contributing to an average humidity of 88%. Whether you're braving the chill or embracing the warmth, be prepared for a mix of conditions!
In December in Rockford, the average temperature is 10°C (51°F). Maximum temperatures can reach 25°C (77°F), while the minimum can drop as low as -6°C (22°F). This variation in temperature makes Rockford an ideal destination for travelers seeking both mild weather and the possibility of crisp, cooler days.
In Rockford in December, the total precipitation amount is 140 mm (5.5 in) over the course of 13 days.
In Rockford in December, humidity is 88%. With an average temperature of 10°C (51°F), this humidity feels like a thick blanket of moisture enveloping you, making every step feel heavier and leaving you yearning for a refreshing breeze as you navigate the streets.
In Rockford in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Rockford for better planning.
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 | 9°C (48°F) | 113 mm (4.5 inches) | 85% | moderate |
| February Weather | 12°C (54°F) | 156 mm (6.1 inches) | 84% | high |
| March Weather | 15°C (59°F) | 129 mm (5.1 inches) | 82% | very high |
| April Weather | 18°C (64°F) | 142 mm (5.6 inches) | 82% | very high |
| May Weather | 22°C (73°F) | 126 mm (5.0 inches) | 81% | extreme |
| June Weather | 25°C (78°F) | 150 mm (5.9 inches) | 77% | extreme |
| July Weather | 27°C (81°F) | 110 mm (4.3 inches) | 77% | extreme |
| August Weather | 27°C (80°F) | 120 mm (4.7 inches) | 72% | extreme |
| September Weather | 25°C (77°F) | 88 mm (3.5 inches) | 73% | very high |
| October Weather | 20°C (69°F) | 119 mm (4.7 inches) | 73% | high |
| November Weather | 12°C (55°F) | 83 mm (3.3 inches) | 85% | high |
| December Weather | 10°C (51°F) | 140 mm (5.5 inches) | 88% | moderate |