Last updated: June 24, 2025
In December, the average temperature in Wyoming, United States hovers around 0°C (32°F), with nighttime lows dipping to a frigid -25°C (-13°F) and daytime highs reaching up to a mild 16°C (62°F). Expect 67 mm (2.6 in) of precipitation over approximately 10 days, contributing to a relatively high average humidity of 86%.
In December in Wyoming, the average temperature is 0°C (32°F). The maximum can reach 16°C (62°F) and the minimum can be as low as -25°C (-13°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your trip.
In Wyoming in December, the total precipitation amount is 67 mm (2.6 in) over a period of 10 days.
In Wyoming in December humidity is 86%. With an average temperature of 0°C (32°F), this humidity feels like a biting chill that seeps into your bones, making travel feel uncomfortable and damp, as the cold air combines with the moisture to create a brisk sensation that may deter outdoor exploration.
In Wyoming 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 Wyoming, you can visit Hourly UV Index in Wyoming.
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 | -3°C (26°F) | 64 mm (2.5 inches) | 87% | low |
| February Weather | -3°C (27°F) | 70 mm (2.7 inches) | 87% | moderate |
| March Weather | 3°C (37°F) | 67 mm (2.6 inches) | 86% | moderate |
| April Weather | 8°C (46°F) | 91 mm (3.6 inches) | 87% | very high |
| May Weather | 15°C (60°F) | 138 mm (5.4 inches) | 82% | very high |
| June Weather | 21°C (70°F) | 119 mm (4.7 inches) | 81% | very high |
| July Weather | 24°C (75°F) | 65 mm (2.6 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 73 mm (2.9 inches) | 79% | very high |
| September Weather | 19°C (66°F) | 111 mm (4.4 inches) | 79% | high |
| October Weather | 12°C (53°F) | 130 mm (5.1 inches) | 82% | moderate |
| November Weather | 4°C (39°F) | 63 mm (2.5 inches) | 87% | moderate |
| December Weather | 0°C (32°F) | 67 mm (2.6 inches) | 86% | low |