Last updated: June 24, 2025
In Ahtanum, United States, the average temperature in December hovers around 1°C (34°F). Expect chilly conditions, with minimums plummeting to -10°C (14°F) and maximums peaking at 19°C (66°F). This month, you can anticipate 59 mm (2.3 in) of precipitation over about 11 days, contributing to an average humidity level of a notable 88%. Prepare for a mix of brisk air and damp weather!
In December, in Ahtanum, the average temperature is 1°C (34°F). The maximum can reach 19°C (66°F), while the minimum can dip as low as -10°C (14°F). Travelers should be prepared for a wide range of temperatures during this time.
In Ahtanum in December, the precipitation amount is 59 mm (2.3 in) over the course of 11 days.
In Ahtanum in December humidity is 88%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making travel feel damp and brisk, where every breath carries a crisp bite, and the air clings to your skin, urging you to seek warmth and comfort.
In Ahtanum 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 Ahtanum, you can visit Hourly UV Index in Ahtanum.
UV Risk Categories
Weather in Ahtanum varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Ahtanum, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 63 mm (2.5 inches) | 86% | low |
| February Weather | 1°C (34°F) | 63 mm (2.5 inches) | 86% | moderate |
| March Weather | 6°C (42°F) | 30 mm (1.2 inches) | 87% | moderate |
| April Weather | 10°C (51°F) | 23 mm (0.9 inches) | 84% | high |
| May Weather | 16°C (62°F) | 13 mm (0.5 inches) | 81% | very high |
| June Weather | 21°C (70°F) | 6 mm (0.2 inches) | 82% | very high |
| July Weather | 25°C (77°F) | 1 mm (0.0 inches) | 79% | very high |
| August Weather | 24°C (76°F) | 4 mm (0.2 inches) | 63% | very high |
| September Weather | 18°C (65°F) | 12 mm (0.5 inches) | 62% | high |
| October Weather | 10°C (51°F) | 37 mm (1.4 inches) | 83% | moderate |
| November Weather | 4°C (40°F) | 42 mm (1.7 inches) | 89% | moderate |
| December Weather | 1°C (34°F) | 59 mm (2.3 inches) | 88% | low |