Last updated: June 24, 2025
In December, the average temperature in Ontonagon, United States hovers around -5°C (24°F), with minimum lows plunging to -27°C (-17°F) and maximum highs reaching 14°C (57°F). Expect a considerable amount of precipitation, with 78 mm (3.1 in) falling over 16 days. Additionally, the atmosphere can feel quite damp, with an average humidity of 90%.
In December in Ontonagon, the average temperature is -5°C (24°F), with maximums reaching up to 14°C (57°F) and minimums dropping as low as -27°C (-17°F). Travelers should be prepared for a wide temperature range and dress in layers to ensure comfort during their visit.
In Ontonagon in December, the precipitation amount is 78 mm (3.1 in) over the course of 16 days.
In Ontonagon in December, humidity is 90%. With an average temperature of -5°C (24°F), this humidity feels like an icy mist wrapping around you, making every breath feel heavy and damp, while the cold sharpens the chill in the air, turning your travel experience into a battle against the harsh elements.
In Ontonagon 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 Ontonagon, you can visit Hourly UV Index in Ontonagon.
UV Risk Categories
Weather in Ontonagon varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Ontonagon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 44 mm (1.7 inches) | 92% | low |
| February Weather | -9°C (17°F) | 60 mm (2.3 inches) | 92% | moderate |
| March Weather | -2°C (28°F) | 54 mm (2.1 inches) | 88% | moderate |
| April Weather | 3°C (38°F) | 82 mm (3.2 inches) | 86% | high |
| May Weather | 12°C (54°F) | 71 mm (2.8 inches) | 78% | very high |
| June Weather | 18°C (64°F) | 90 mm (3.5 inches) | 74% | very high |
| July Weather | 21°C (69°F) | 77 mm (3.0 inches) | 70% | very high |
| August Weather | 19°C (66°F) | 111 mm (4.4 inches) | 71% | very high |
| September Weather | 15°C (60°F) | 92 mm (3.6 inches) | 74% | high |
| October Weather | 8°C (46°F) | 118 mm (4.6 inches) | 81% | moderate |
| November Weather | 0°C (31°F) | 72 mm (2.8 inches) | 86% | moderate |
| December Weather | -5°C (24°F) | 78 mm (3.1 inches) | 90% | low |