Last updated: June 24, 2025
In December, the average temperature in West Valley, United States hovers around -1°C (30°F). Expect chilly days, with minimum temperatures plummeting to -22°C (-7°F), while the mercury can peak at a cozy 16°C (61°F). Prepare for 115 mm (4.5 in) of precipitation spread over about 18 days, and a notably high average humidity of 87%.
In December in West Valley, the average temperature is -1°C (30°F), with maximums reaching 16°C (61°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide temperature range and pack accordingly for both chilly and milder conditions.
In West Valley in December, the precipitation amount is 115 mm (4.5 in) occurring over 18 days.
In West Valley in December, humidity is 87%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that penetrates through layers of clothing, making travel uncomfortable as the dampness clings to your skin, intensifying the cold and causing every gust of wind to feel even more frigid.
In West Valley 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 West Valley, you can visit Hourly UV Index in West Valley.
UV Risk Categories
Weather in West Valley varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in West Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (24°F) | 97 mm (3.8 inches) | 91% | moderate |
| February Weather | -3°C (27°F) | 104 mm (4.1 inches) | 91% | moderate |
| March Weather | 1°C (33°F) | 97 mm (3.8 inches) | 88% | high |
| April Weather | 7°C (44°F) | 129 mm (5.1 inches) | 88% | very high |
| May Weather | 14°C (57°F) | 131 mm (5.2 inches) | 82% | very high |
| June Weather | 18°C (65°F) | 124 mm (4.9 inches) | 79% | very high |
| July Weather | 21°C (70°F) | 152 mm (6.0 inches) | 77% | very high |
| August Weather | 20°C (68°F) | 109 mm (4.3 inches) | 72% | very high |
| September Weather | 17°C (62°F) | 83 mm (3.3 inches) | 76% | very high |
| October Weather | 11°C (52°F) | 149 mm (5.9 inches) | 83% | high |
| November Weather | 3°C (37°F) | 114 mm (4.5 inches) | 88% | moderate |
| December Weather | -1°C (30°F) | 115 mm (4.5 inches) | 87% | low |