Last updated: June 24, 2025
In December, the average temperature in Green River, United States is a brisk 0°C (33°F). Expect temperatures to fluctuate from a chilly -13°C (8°F) at night to a pleasant 17°C (62°F) during the day. While you might enjoy crisp and cool air, be prepared for some rain, as 15 mm (0.6 in) of precipitation is expected over 3 days. With an average humidity level of 87%, this month promises to envelop you in a truly refreshing atmosphere!
In December in Green River, the average temperature is 0°C (33°F). Maximums can reach 17°C (62°F), and minimums can be as low as -13°C (8°F). Be sure to pack layers to stay comfortable while exploring the winter scenery and enjoy the crisp, chilly air!
In Green River in December, the precipitation amount is 15 mm (0.6 in) over the course of 3 days.
In Green River in December, humidity is 87%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making every step feel heavier and the air thick and suffocating, often leading to a sense of discomfort while traveling.
In Green River 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 Green River, you can check the information here.
UV Risk Categories
Weather in Green River varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Green River, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (30°F) | 19 mm (0.7 inches) | 87% | moderate |
| February Weather | 3°C (37°F) | 20 mm (0.8 inches) | 88% | high |
| March Weather | 9°C (48°F) | 23 mm (0.9 inches) | 77% | very high |
| April Weather | 13°C (56°F) | 11 mm (0.4 inches) | 69% | very high |
| May Weather | 18°C (65°F) | 20 mm (0.8 inches) | 54% | extreme |
| June Weather | 25°C (78°F) | 5 mm (0.2 inches) | 45% | extreme |
| July Weather | 29°C (84°F) | 8 mm (0.3 inches) | 37% | extreme |
| August Weather | 27°C (81°F) | 12 mm (0.5 inches) | 34% | extreme |
| September Weather | 22°C (71°F) | 13 mm (0.5 inches) | 47% | very high |
| October Weather | 11°C (53°F) | 23 mm (0.9 inches) | 67% | high |
| November Weather | 5°C (42°F) | 15 mm (0.6 inches) | 82% | moderate |
| December Weather | 0°C (33°F) | 15 mm (0.6 inches) | 87% | moderate |