Last updated: June 24, 2025
In December, the average temperature in Grantsville, United States hovers around 1°C (34°F), with the minimum reaching a chilling -20°C (-4°F) and the maximum peaking at a mild 18°C (65°F). This month often brings 121 mm (4.8 in) of precipitation spread across 15 days, while the air stays refreshingly humid at an average of 85%.
In December in Grantsville, the average temperature is 1°C (34°F). Maximum temperatures can reach 18°C (65°F), while minimums can drop as low as -20°C (-4°F). It's a great time for travelers to experience a mix of chilly and mild weather, so prepare for varied conditions when exploring the area.
In Grantsville in December, the precipitation amount is 121 mm (4.8 in) during a period of 15 days.
In Grantsville in December, humidity is 85%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making outdoor travel uncomfortable and urging you to seek warmth indoors rather than explore the surroundings.
In Grantsville 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 Grantsville, you can check the information here.
UV Risk Categories
Weather in Grantsville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Grantsville, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -2°C (29°F) | 88 mm (3.5 inches) | 86% | moderate |
February Weather | 1°C (33°F) | 132 mm (5.2 inches) | 86% | moderate |
March Weather | 4°C (39°F) | 115 mm (4.5 inches) | 86% | high |
April Weather | 9°C (49°F) | 137 mm (5.4 inches) | 84% | very high |
May Weather | 15°C (59°F) | 155 mm (6.1 inches) | 78% | very high |
June Weather | 19°C (67°F) | 150 mm (5.9 inches) | 79% | very high |
July Weather | 22°C (71°F) | 105 mm (4.1 inches) | 70% | very high |
August Weather | 21°C (70°F) | 99 mm (3.9 inches) | 59% | very high |
September Weather | 18°C (64°F) | 119 mm (4.7 inches) | 68% | very high |
October Weather | 12°C (54°F) | 115 mm (4.5 inches) | 80% | high |
November Weather | 4°C (40°F) | 85 mm (3.3 inches) | 86% | moderate |
December Weather | 1°C (34°F) | 121 mm (4.8 inches) | 85% | moderate |