Last updated: June 24, 2025
In December, the average temperature in Chicago Heights, United States hovers around 1°C (34°F), with a minimum that can plunge to -21°C (-5°F) and a maximum reaching 19°C (66°F). Expect about 57 mm (2.2 in) of precipitation over 7 days, contributing to an average humidity of 84%. Stay prepared for varied weather conditions!
In December in Chicago Heights, the average temperature is 1°C (34°F). The maximum can reach 19°C (66°F), while the minimum can drop as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Chicago Heights in December, the precipitation amount is 57 mm (2.2 in) over the course of 7 days.
In Chicago Heights in December humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.
In Chicago Heights 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 Chicago Heights, you can visit Hourly UV Index in Chicago Heights.
UV Risk Categories
Weather in Chicago Heights varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Chicago Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 66 mm (2.6 inches) | 82% | moderate |
| February Weather | -2°C (29°F) | 69 mm (2.7 inches) | 83% | moderate |
| March Weather | 4°C (40°F) | 96 mm (3.8 inches) | 84% | high |
| April Weather | 9°C (49°F) | 122 mm (4.8 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 163 mm (6.4 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 143 mm (5.6 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 114 mm (4.5 inches) | 80% | very high |
| August Weather | 23°C (73°F) | 92 mm (3.6 inches) | 81% | very high |
| September Weather | 20°C (68°F) | 80 mm (3.1 inches) | 80% | very high |
| October Weather | 13°C (55°F) | 139 mm (5.5 inches) | 82% | high |
| November Weather | 4°C (40°F) | 63 mm (2.5 inches) | 88% | moderate |
| December Weather | 1°C (34°F) | 57 mm (2.2 inches) | 84% | low |