Last updated: June 24, 2025
In December, the average temperature in Streator, United States hovers around 1°C (34°F), with potential extremes ranging from a frigid -21°C (-5°F) to a milder 20°C (68°F). During this month, expect about 56 mm (2.2 in) of precipitation spread over 7 days, and experience a notable average humidity of 84%.
In December in Streator, the average temperature is 1°C (34°F). The maximum can reach 20°C (68°F) and the minimum can be as low as -21°C (-5°F). This variation in temperatures makes Streator an intriguing destination for travelers, offering a mix of chilly days and surprisingly warm spells.
In Streator in December, the total precipitation amount is 56 mm (2.2 in) over a period of 7 days.
In Streator 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 Streator 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 Streator, you can visit Hourly UV Index in Streator.
UV Risk Categories
Weather in Streator varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Streator, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 62 mm (2.4 inches) | 82% | moderate |
| February Weather | -2°C (29°F) | 68 mm (2.7 inches) | 83% | moderate |
| March Weather | 5°C (41°F) | 99 mm (3.9 inches) | 84% | high |
| April Weather | 10°C (51°F) | 117 mm (4.6 inches) | 85% | very high |
| May Weather | 17°C (64°F) | 163 mm (6.4 inches) | 79% | very high |
| June Weather | 23°C (74°F) | 135 mm (5.3 inches) | 82% | very high |
| July Weather | 25°C (76°F) | 100 mm (3.9 inches) | 80% | very high |
| August Weather | 23°C (74°F) | 92 mm (3.6 inches) | 81% | very high |
| September Weather | 21°C (69°F) | 82 mm (3.2 inches) | 80% | very high |
| October Weather | 13°C (56°F) | 131 mm (5.2 inches) | 82% | high |
| November Weather | 4°C (40°F) | 56 mm (2.2 inches) | 88% | moderate |
| December Weather | 1°C (34°F) | 56 mm (2.2 inches) | 84% | low |