Last updated: June 24, 2025
In Star Valley, United States, the average temperature in December hovers around 5°C (41°F). During this time, you can expect a minimum chill of -12°C (11°F) and a pleasantly warm maximum reaching up to 21°C (69°F). Rainfall is moderate, with 51 mm (2.0 in) of precipitation spread over 7 days, contributing to an average humidity of 82%.
In December in Star Valley, the average temperature is a cool 5°C (41°F), with maximums reaching up to 21°C (69°F) and minimums dipping as low as -12°C (11°F). Be sure to pack layers to accommodate the varying temperatures while exploring the area.
In Star Valley in December, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.
In Star Valley in December, humidity is 82%. With an average temperature of 5°C (41°F), this humidity feels like a chilly, damp blanket wrapping around you, making outdoor activities less enjoyable and making it essential to dress in layers to stay warm while navigating the wet conditions.
In Star Valley in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Star Valley.
UV Risk Categories
Weather in Star Valley varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Star Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 64 mm (2.5 inches) | 80% | moderate |
| February Weather | 5°C (41°F) | 80 mm (3.1 inches) | 83% | high |
| March Weather | 8°C (47°F) | 64 mm (2.5 inches) | 72% | very high |
| April Weather | 13°C (56°F) | 11 mm (0.4 inches) | 63% | extreme |
| May Weather | 17°C (63°F) | 17 mm (0.7 inches) | 46% | extreme |
| June Weather | 24°C (75°F) | 7 mm (0.3 inches) | 35% | extreme |
| July Weather | 24°C (76°F) | 111 mm (4.4 inches) | 33% | extreme |
| August Weather | 24°C (75°F) | 50 mm (1.9 inches) | 41% | extreme |
| September Weather | 21°C (70°F) | 36 mm (1.4 inches) | 59% | extreme |
| October Weather | 15°C (59°F) | 36 mm (1.4 inches) | 70% | very high |
| November Weather | 10°C (50°F) | 32 mm (1.3 inches) | 79% | high |
| December Weather | 5°C (41°F) | 51 mm (2.0 inches) | 82% | moderate |