Last updated: June 24, 2025
In December, the average temperature in Hayden, United States hovers around 4°C (39°F). The weather can be quite unpredictable, with minimums dipping to -17°C (2°F) and maximums reaching a pleasant 20°C (69°F). Expect 102 mm (4.0 in) of precipitation spread over about 9 days, and be prepared for the high average humidity of 87%, which contributes to a chilly yet atmospheric feel in the region.
In December in Hayden, the average temperature is 4°C (39°F). Maximums can reach 20°C (69°F) and minimums can be as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack layers for both warm and cold conditions.
In Hayden in December, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.
In Hayden in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.
In Hayden 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 Hayden, you can check the information here.
UV Risk Categories
Weather in Hayden varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hayden, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 81 mm (3.2 inches) | 87% | moderate |
| February Weather | 3°C (37°F) | 109 mm (4.3 inches) | 85% | moderate |
| March Weather | 8°C (46°F) | 135 mm (5.3 inches) | 86% | high |
| April Weather | 13°C (55°F) | 125 mm (4.9 inches) | 84% | very high |
| May Weather | 19°C (67°F) | 128 mm (5.1 inches) | 79% | very high |
| June Weather | 24°C (75°F) | 125 mm (4.9 inches) | 82% | extreme |
| July Weather | 25°C (78°F) | 95 mm (3.8 inches) | 79% | very high |
| August Weather | 24°C (76°F) | 91 mm (3.6 inches) | 70% | very high |
| September Weather | 22°C (71°F) | 86 mm (3.4 inches) | 69% | very high |
| October Weather | 15°C (60°F) | 94 mm (3.7 inches) | 76% | high |
| November Weather | 7°C (44°F) | 97 mm (3.8 inches) | 88% | moderate |
| December Weather | 4°C (39°F) | 102 mm (4.0 inches) | 87% | moderate |