Last updated: June 24, 2025
In December, the average temperature in Sun Prairie, United States hovers around -2°C (29°F). Visitors can expect chilly lows of -22°C (-7°F) and surprisingly warm highs of 18°C (65°F). Precipitation is noteworthy, with an average of 46 mm (1.8 in) falling over 6 days. Coupled with an average humidity of 81%, be prepared for a brisk, yet potentially wet atmosphere!
In December in Sun Prairie, the average temperature is -2°C (29°F). The maximum can reach 18°C (65°F), while the minimum can drop as low as -22°C (-7°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.
In Sun Prairie in December, the precipitation amount is 46 mm (1.8 in) over a span of 6 days.
In Sun Prairie in December humidity is 81%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm while traveling.
In Sun Prairie 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 Sun Prairie, you can visit Hourly UV Index in Sun Prairie.
UV Risk Categories
Weather in Sun Prairie varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sun Prairie, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 51 mm (2.0 inches) | 85% | moderate |
| February Weather | -6°C (22°F) | 53 mm (2.1 inches) | 85% | moderate |
| March Weather | 2°C (35°F) | 57 mm (2.3 inches) | 85% | moderate |
| April Weather | 7°C (46°F) | 99 mm (3.9 inches) | 85% | very high |
| May Weather | 15°C (59°F) | 130 mm (5.1 inches) | 78% | very high |
| June Weather | 21°C (70°F) | 114 mm (4.5 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 99 mm (3.9 inches) | 78% | very high |
| August Weather | 22°C (71°F) | 106 mm (4.2 inches) | 76% | very high |
| September Weather | 18°C (65°F) | 110 mm (4.3 inches) | 79% | very high |
| October Weather | 11°C (51°F) | 118 mm (4.6 inches) | 83% | moderate |
| November Weather | 2°C (36°F) | 43 mm (1.7 inches) | 88% | moderate |
| December Weather | -2°C (29°F) | 46 mm (1.8 inches) | 81% | low |