Last updated: June 24, 2025
In December, the average temperature in Mount Morris, United States is a chilly 0°C (32°F), with extremes ranging from a frigid -21°C (-5°F) to a mild 17°C (63°F). This month also sees 53 mm (2.1 in) of precipitation spread over approximately 10 days, contributing to an average humidity level of 86%. Prepare for brisk days and potential rain!
In December in Mount Morris, the average temperature is 0°C (32°F). The maximum can reach 17°C (63°F) while the minimum can drop as low as -21°C (-5°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.
In Mount Morris in December, the precipitation amount is 53 mm (2.1 in) spread over a duration of 10 days.
In Mount Morris in December humidity is 86%. With an average temperature of 0°C (32°F), this humidity feels like a biting chill that seeps into your bones, making travel feel uncomfortable and damp, as the cold air combines with the moisture to create a brisk sensation that may deter outdoor exploration.
In Mount Morris 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 Mount Morris, you can visit Hourly UV Index in Mount Morris.
UV Risk Categories
Weather in Mount Morris varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mount Morris, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 62 mm (2.4 inches) | 88% | low |
| February Weather | -3°C (27°F) | 65 mm (2.6 inches) | 87% | moderate |
| March Weather | 2°C (36°F) | 65 mm (2.6 inches) | 85% | moderate |
| April Weather | 8°C (46°F) | 92 mm (3.6 inches) | 86% | very high |
| May Weather | 15°C (59°F) | 104 mm (4.1 inches) | 80% | very high |
| June Weather | 21°C (70°F) | 104 mm (4.1 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 76 mm (3.0 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 80 mm (3.2 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 87 mm (3.4 inches) | 80% | high |
| October Weather | 12°C (53°F) | 108 mm (4.3 inches) | 84% | moderate |
| November Weather | 3°C (38°F) | 65 mm (2.5 inches) | 89% | moderate |
| December Weather | 0°C (32°F) | 53 mm (2.1 inches) | 86% | low |