Last updated: June 24, 2025
In December, the average temperature in Mount Morris, United States hovers around 0°C (32°F), with extremes ranging from a chilling -21°C (-6°F) to a milder 20°C (68°F). Expect about 51 mm (2.0 in) of precipitation over approximately 6 days, contributing to an average humidity of 84%. Ensure you’re prepared for the cold and damp conditions!
In December in Mount Morris, the average temperature is 0°C (32°F). Maximums can reach 20°C (68°F), while minimums can drop to as low as -21°C (-6°F). Be prepared for a wide range of temperatures when traveling to Mount Morris during this time.
In Mount Morris in December, the precipitation amount is 51 mm (2.0 in) over the course of 6 days.
In Mount Morris in December, humidity is 84%. With an average temperature of 0°C (32°F), this humidity feels like a cold, damp chill that seeps into your clothes, making traveling uncomfortable and necessitating extra layers to stay warm despite the moisture-laden air.
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 | -5°C (23°F) | 59 mm (2.3 inches) | 82% | moderate |
| February Weather | -4°C (25°F) | 58 mm (2.3 inches) | 83% | moderate |
| March Weather | 4°C (39°F) | 81 mm (3.2 inches) | 84% | high |
| April Weather | 9°C (48°F) | 110 mm (4.3 inches) | 85% | very high |
| May Weather | 16°C (61°F) | 152 mm (6.0 inches) | 79% | very high |
| June Weather | 22°C (72°F) | 124 mm (4.9 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 85 mm (3.3 inches) | 80% | very high |
| August Weather | 22°C (73°F) | 79 mm (3.1 inches) | 81% | very high |
| September Weather | 20°C (67°F) | 120 mm (4.7 inches) | 80% | very high |
| October Weather | 12°C (53°F) | 114 mm (4.5 inches) | 82% | high |
| November Weather | 3°C (38°F) | 49 mm (1.9 inches) | 88% | moderate |
| December Weather | 0°C (32°F) | 51 mm (2.0 inches) | 84% | low |