Last updated: June 24, 2025
In December, the average temperature in Sheridan, United States hovers around 2°C (35°F). Expect fluctuations with minimums plunging to -23°C (-9°F) and maximums hitting 17°C (64°F). Rainy days are common, bringing about 69 mm (2.7 in) of precipitation spread over 10 days. With an average humidity of 86%, it’s a month that feels as chilly as it is wet.
In December in Sheridan, the average temperature is 2°C (35°F). Maximum temperatures can reach 17°C (64°F), while minimums can drop to a chilling -23°C (-9°F). Be prepared for significant temperature fluctuations and dress accordingly when traveling during this time.
In Sheridan in December, the precipitation amount is 69 mm (2.7 in) spread over a period of 10 days.
In Sheridan in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.
In Sheridan 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 Sheridan, you can visit Hourly UV Index in Sheridan.
UV Risk Categories
Weather in Sheridan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sheridan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 78 mm (3.1 inches) | 85% | moderate |
| February Weather | 0°C (32°F) | 85 mm (3.4 inches) | 85% | moderate |
| March Weather | 5°C (42°F) | 111 mm (4.4 inches) | 86% | high |
| April Weather | 11°C (52°F) | 93 mm (3.7 inches) | 87% | very high |
| May Weather | 18°C (64°F) | 147 mm (5.8 inches) | 81% | very high |
| June Weather | 23°C (73°F) | 109 mm (4.3 inches) | 82% | extreme |
| July Weather | 24°C (76°F) | 106 mm (4.2 inches) | 81% | very high |
| August Weather | 23°C (73°F) | 100 mm (4.0 inches) | 79% | very high |
| September Weather | 21°C (69°F) | 72 mm (2.8 inches) | 78% | very high |
| October Weather | 14°C (57°F) | 107 mm (4.2 inches) | 81% | high |
| November Weather | 5°C (41°F) | 82 mm (3.2 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 69 mm (2.7 inches) | 86% | low |