Last updated: June 24, 2025
In December, the average temperature in Mossyrock, United States hovers around 4°C (39°F). Expect chilly days, with minimum temperatures plunging to -7°C (19°F) and a pleasant maximum of 13°C (56°F). This month brings 228 mm (9.0 in) of precipitation over approximately 20 days, contributing to an overall average humidity of 87%. Prepare for a moist and brisk atmosphere!
In December in Mossyrock, the average temperature is 4°C (39°F), with maximums reaching 13°C (56°F) and minimums dropping as low as -7°C (19°F). Be sure to pack warm clothing and prepare for chilly conditions if you're planning to visit during this time.
In Mossyrock in December, the precipitation amount is 228 mm (9.0 in) over the course of 20 days.
In Mossyrock 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 Mossyrock 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 Mossyrock, you can visit Hourly UV Index in Mossyrock.
UV Risk Categories
Weather in Mossyrock varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mossyrock, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 210 mm (8.3 inches) | 86% | low |
| February Weather | 3°C (37°F) | 239 mm (9.4 inches) | 84% | moderate |
| March Weather | 5°C (42°F) | 165 mm (6.5 inches) | 85% | moderate |
| April Weather | 8°C (47°F) | 143 mm (5.6 inches) | 83% | high |
| May Weather | 12°C (54°F) | 90 mm (3.5 inches) | 84% | very high |
| June Weather | 15°C (59°F) | 72 mm (2.8 inches) | 84% | very high |
| July Weather | 18°C (64°F) | 16 mm (0.6 inches) | 82% | very high |
| August Weather | 18°C (65°F) | 20 mm (0.8 inches) | 73% | very high |
| September Weather | 15°C (59°F) | 95 mm (3.7 inches) | 74% | high |
| October Weather | 9°C (49°F) | 174 mm (6.8 inches) | 83% | moderate |
| November Weather | 6°C (43°F) | 215 mm (8.5 inches) | 86% | moderate |
| December Weather | 4°C (39°F) | 228 mm (9.0 inches) | 87% | low |