Last updated: June 24, 2025
In Onalaska, United States, the average temperature for December hovers around -3°C (26°F), with extreme variations possible—dropping as low as -24°C (-11°F) and peaking at 17°C (64°F). This chilly month witnesses an average precipitation of 44 mm (1.7 in) over 7 days, contributing to a humidity level of 82%. Prepare for a brisk winter experience!
In December in Onalaska, the average temperature is -3°C (26°F), with a maximum that can reach 17°C (64°F) and a minimum that can drop as low as -24°C (-11°F). Be prepared for a wide range of temperatures and dress accordingly when traveling to Onalaska this month.
In Onalaska in December, the precipitation amount is 44 mm (1.7 in) spread over a duration of 7 days.
In Onalaska in December, humidity is 82%. With an average temperature of -3°C (26°F), this humidity feels like an uncomfortable chill that makes traveling outside feel more biting and penetrating, as the cold damp air clings to your skin, intensifying the cold sensation and making even short excursions feel more daunting.
In Onalaska 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 Onalaska, you can visit Hourly UV Index in Onalaska.
UV Risk Categories
Weather in Onalaska varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Onalaska, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 35 mm (1.4 inches) | 84% | low |
| February Weather | -7°C (20°F) | 49 mm (1.9 inches) | 85% | moderate |
| March Weather | 2°C (35°F) | 57 mm (2.2 inches) | 84% | moderate |
| April Weather | 7°C (45°F) | 86 mm (3.4 inches) | 83% | very high |
| May Weather | 15°C (59°F) | 142 mm (5.6 inches) | 75% | very high |
| June Weather | 21°C (71°F) | 139 mm (5.5 inches) | 79% | very high |
| July Weather | 23°C (74°F) | 101 mm (4.0 inches) | 75% | very high |
| August Weather | 21°C (70°F) | 127 mm (5.0 inches) | 69% | very high |
| September Weather | 18°C (64°F) | 109 mm (4.3 inches) | 74% | high |
| October Weather | 10°C (50°F) | 118 mm (4.6 inches) | 79% | moderate |
| November Weather | 2°C (35°F) | 53 mm (2.1 inches) | 88% | moderate |
| December Weather | -3°C (26°F) | 44 mm (1.7 inches) | 82% | low |