Last updated: June 24, 2025
In December, the average temperature in Wyoming, United States hovers around -1°C (31°F), but don't be fooled by the chill; temperatures can dip as low as -22°C (-7°F) or soar to a surprising 21°C (71°F). Expect about 46 mm (1.8 in) of precipitation spread over 6 days, contributing to an average humidity level of 84% that adds to the crisp air.
In December in Wyoming, the average temperature is -1°C (31°F), with maximums reaching 21°C (71°F) and minimums plummeting to -22°C (-7°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!
In Wyoming in December, the precipitation amount is 46 mm (1.8 in) over a span of 6 days.
In Wyoming in December humidity is 84%. With an average temperature of -1°C (31°F), this humidity feels like a biting chill that seeps through layers of clothing, making outdoor excursions brisk and invigorating, yet challenging for those unaccustomed to such damp conditions.
In Wyoming 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 Wyoming, you can check the information here.
UV Risk Categories
Weather in Wyoming varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Wyoming, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 49 mm (1.9 inches) | 81% | moderate |
| February Weather | -5°C (24°F) | 59 mm (2.3 inches) | 81% | moderate |
| March Weather | 3°C (38°F) | 73 mm (2.9 inches) | 81% | high |
| April Weather | 9°C (48°F) | 88 mm (3.5 inches) | 82% | very high |
| May Weather | 16°C (62°F) | 140 mm (5.5 inches) | 78% | very high |
| June Weather | 22°C (73°F) | 118 mm (4.6 inches) | 81% | extreme |
| July Weather | 24°C (76°F) | 78 mm (3.1 inches) | 79% | very high |
| August Weather | 22°C (72°F) | 91 mm (3.6 inches) | 77% | very high |
| September Weather | 19°C (67°F) | 127 mm (5.0 inches) | 78% | very high |
| October Weather | 11°C (53°F) | 124 mm (4.9 inches) | 78% | high |
| November Weather | 3°C (38°F) | 49 mm (1.9 inches) | 87% | moderate |
| December Weather | -1°C (31°F) | 46 mm (1.8 inches) | 84% | moderate |