Last updated: June 24, 2025
In December, the average temperature in Rochester, United States hovers around -1°C (31°F). Expect some chilly nights, with minimum temperatures plummeting to -22°C (-7°F), while daytime highs can reach up to 16°C (61°F). Prepare for a wet month, as 128 mm (5.0 in) of precipitation is scattered over about 10 days, contributing to an average humidity of 81%.
In December in Rochester, the average temperature is -1°C (31°F). The maximum can reach 16°C (61°F), and the minimum can be as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and dress in layers to enjoy their visit comfortably.
In Rochester in December, the total precipitation amount is 128 mm (5.0 in) recorded over a span of 10 days.
In Rochester in December humidity is 81%. With an average temperature of -1°C (31°F), this humidity feels like a heavy, cold mist that clings to your skin, making outdoor adventures damp and challenging.
In Rochester 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 Rochester, you can visit Hourly UV Index in Rochester.
UV Risk Categories
Weather in Rochester varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Rochester, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 75 mm (3.0 inches) | 86% | moderate |
| February Weather | -2°C (29°F) | 91 mm (3.6 inches) | 84% | moderate |
| March Weather | 2°C (35°F) | 84 mm (3.3 inches) | 82% | moderate |
| April Weather | 8°C (46°F) | 133 mm (5.2 inches) | 80% | very high |
| May Weather | 14°C (57°F) | 76 mm (3.0 inches) | 72% | very high |
| June Weather | 20°C (67°F) | 91 mm (3.6 inches) | 72% | very high |
| July Weather | 22°C (72°F) | 138 mm (5.4 inches) | 67% | very high |
| August Weather | 22°C (72°F) | 81 mm (3.2 inches) | 66% | very high |
| September Weather | 18°C (65°F) | 73 mm (2.9 inches) | 71% | high |
| October Weather | 12°C (54°F) | 129 mm (5.1 inches) | 78% | moderate |
| November Weather | 4°C (40°F) | 108 mm (4.3 inches) | 84% | moderate |
| December Weather | -1°C (31°F) | 128 mm (5.0 inches) | 81% | low |