Last updated: June 24, 2025
In December, the average temperature in Gunnison, United States hovers around -3°C (27°F), but be prepared for extremes—minimums can plummet to -21°C (-6°F) while maximums can reach a mild 14°C (58°F). Expect about 43 mm (1.7 in) of precipitation spread over 9 days, contributing to an average humidity of 87%. Dress warmly and stay dry!
In December in Gunnison, the average temperature is -3°C (27°F), with a maximum that can reach 14°C (58°F) and a minimum that can drop as low as -21°C (-6°F). Travelers should be prepared for a wide temperature range and dress accordingly for both chilly and milder conditions.
In Gunnison in December, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 days.
In Gunnison in December humidity is 87%. With an average temperature of -3°C (27°F), this humidity feels like an icy blanket that wraps around you, making outdoor activities challenging as the cold air mingles with the dampness, leaving travelers feeling chilled to the bone even in short bursts outside.
In Gunnison in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Gunnison for better planning.
UV Risk Categories
Weather in Gunnison varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Gunnison, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 45 mm (1.8 inches) | 87% | moderate |
| February Weather | -3°C (28°F) | 51 mm (2.0 inches) | 88% | high |
| March Weather | 2°C (36°F) | 54 mm (2.1 inches) | 77% | very high |
| April Weather | 7°C (45°F) | 39 mm (1.5 inches) | 69% | extreme |
| May Weather | 13°C (55°F) | 36 mm (1.4 inches) | 54% | extreme |
| June Weather | 20°C (69°F) | 8 mm (0.3 inches) | 45% | extreme |
| July Weather | 24°C (76°F) | 12 mm (0.5 inches) | 37% | extreme |
| August Weather | 23°C (74°F) | 9 mm (0.4 inches) | 34% | extreme |
| September Weather | 18°C (64°F) | 18 mm (0.7 inches) | 47% | very high |
| October Weather | 8°C (47°F) | 34 mm (1.3 inches) | 67% | high |
| November Weather | 3°C (38°F) | 28 mm (1.1 inches) | 82% | high |
| December Weather | -3°C (27°F) | 43 mm (1.7 inches) | 87% | moderate |