Last updated: June 24, 2025
In December, the average temperature in Vandalia, United States hovers around 3°C (38°F), offering a cool climate. Temperatures can swing dramatically, with minimums dipping to -20°C (-3°F) and maximums reaching 20°C (68°F). Expect about 71 mm (2.8 in) of precipitation over 7 days, contributing to an average humidity of 87%. Prepare accordingly!
In December in Vandalia, the average temperature is 3°C (38°F), with maximums reaching 20°C (68°F) and minimums plunging as low as -20°C (-3°F). It’s essential to pack for a variety of weather conditions when traveling during this time.
In Vandalia in December, the precipitation amount is 71 mm (2.8 in) over a span of 7 days.
In Vandalia in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Vandalia in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Vandalia, you can check the information here.
UV Risk Categories
Weather in Vandalia varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Vandalia, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 80 mm (3.1 inches) | 84% | moderate |
| February Weather | 2°C (35°F) | 82 mm (3.2 inches) | 82% | moderate |
| March Weather | 8°C (46°F) | 134 mm (5.3 inches) | 84% | high |
| April Weather | 12°C (55°F) | 130 mm (5.1 inches) | 83% | very high |
| May Weather | 19°C (67°F) | 153 mm (6.0 inches) | 80% | extreme |
| June Weather | 25°C (77°F) | 105 mm (4.1 inches) | 83% | extreme |
| July Weather | 26°C (79°F) | 94 mm (3.7 inches) | 82% | very high |
| August Weather | 24°C (76°F) | 105 mm (4.1 inches) | 82% | very high |
| September Weather | 22°C (72°F) | 62 mm (2.4 inches) | 79% | very high |
| October Weather | 15°C (59°F) | 114 mm (4.5 inches) | 79% | high |
| November Weather | 6°C (43°F) | 83 mm (3.3 inches) | 88% | moderate |
| December Weather | 3°C (38°F) | 71 mm (2.8 inches) | 87% | moderate |