Last updated: June 24, 2025
In December, the average temperature in Plainfield, United States hovers around -4°C (26°F), with temperatures ranging from a chilling -28°C (-19°F) to a mild 16°C (62°F). Expect approximately 50 mm (2.0 in) of precipitation spread over 7 days. With an average humidity of 87%, the air feels crisp and damp, making it a unique time to experience the region’s winter charm.
In December in Plainfield, the average temperature is -4°C (26°F), with a maximum that can reach 16°C (62°F) and a minimum that can drop as low as -28°C (-19°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for variable weather conditions.
In Plainfield in December, the precipitation amount is 50 mm (2.0 in) over a span of 7 days.
In Plainfield in December humidity is 87%. With average temperature -4°C (26°F), this humidity feels like an icy blanket enveloping you, making outdoor activities challenging and rendering those brisk air moments difficult to bear, as the cold moisture seeps into your clothing and chills you to the bone.
In Plainfield 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 Plainfield, you can visit Hourly UV Index in Plainfield.
UV Risk Categories
Weather in Plainfield varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Plainfield, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 39 mm (1.5 inches) | 89% | low |
| February Weather | -7°C (20°F) | 52 mm (2.0 inches) | 90% | moderate |
| March Weather | 1°C (33°F) | 62 mm (2.4 inches) | 87% | moderate |
| April Weather | 6°C (43°F) | 99 mm (3.9 inches) | 84% | very high |
| May Weather | 14°C (58°F) | 111 mm (4.4 inches) | 77% | very high |
| June Weather | 20°C (69°F) | 109 mm (4.3 inches) | 75% | very high |
| July Weather | 23°C (73°F) | 121 mm (4.7 inches) | 74% | very high |
| August Weather | 21°C (69°F) | 128 mm (5.0 inches) | 73% | very high |
| September Weather | 17°C (63°F) | 105 mm (4.1 inches) | 78% | high |
| October Weather | 9°C (49°F) | 107 mm (4.2 inches) | 84% | moderate |
| November Weather | 1°C (34°F) | 51 mm (2.0 inches) | 89% | moderate |
| December Weather | -4°C (26°F) | 50 mm (2.0 inches) | 87% | low |