Last updated: June 24, 2025
In December, the average temperature in Effingham, United States hovers around -3°C (27°F). Expect a chilling minimum of -26°C (-14°F) and a surprisingly mild maximum of 15°C (59°F). Along with these temperatures, anticipate 120 mm (4.7 in) of precipitation spread over about 10 days, contributing to an average humidity of 81%. Prepare accordingly!
In December in Effingham, the average temperature is -3°C (27°F), with maximums that can reach 15°C (59°F) and minimums that can plunge to as low as -26°C (-14°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack appropriately for both chilly and mild conditions.
In Effingham in December, the precipitation amount is 120 mm (4.7 in) spread over a duration of 10 days.
In Effingham in December humidity is 81%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making traveling uncomfortable and forcing you to bundle up tightly to fend off the cold dampness.
In Effingham 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 Effingham, you can visit Hourly UV Index in Effingham.
UV Risk Categories
Weather in Effingham varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Effingham, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 81 mm (3.2 inches) | 86% | moderate |
| February Weather | -4°C (25°F) | 90 mm (3.6 inches) | 84% | moderate |
| March Weather | 0°C (32°F) | 78 mm (3.1 inches) | 82% | moderate |
| April Weather | 6°C (44°F) | 131 mm (5.2 inches) | 80% | very high |
| May Weather | 13°C (56°F) | 78 mm (3.1 inches) | 72% | very high |
| June Weather | 19°C (66°F) | 95 mm (3.7 inches) | 72% | very high |
| July Weather | 22°C (71°F) | 148 mm (5.8 inches) | 67% | very high |
| August Weather | 21°C (70°F) | 86 mm (3.4 inches) | 66% | very high |
| September Weather | 17°C (63°F) | 65 mm (2.6 inches) | 71% | high |
| October Weather | 11°C (51°F) | 127 mm (5.0 inches) | 78% | moderate |
| November Weather | 3°C (37°F) | 113 mm (4.4 inches) | 84% | moderate |
| December Weather | -3°C (27°F) | 120 mm (4.7 inches) | 81% | low |