Last updated: June 24, 2025
In December, the average temperature in Rochester, United States hovers around 0°C (32°F). Be prepared for a chilly range, with minimums dipping to -22°C (-8°F) and maximums reaching 18°C (64°F). Expect about 53 mm (2.1 in) of precipitation over 9 days, contributing to a high average humidity of 86%. Stay warm and dry during this brisk month!
In December in Rochester, the average temperature is 0°C (32°F). The maximum can reach 18°C (64°F) and the minimum can be as low as -22°C (-8°F). It's essential to pack for a variety of weather conditions if you're planning to travel during this time.
In Rochester in December, the total precipitation amount is 53 mm (2.1 in) spread over 9 days.
In Rochester 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 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 | -4°C (26°F) | 62 mm (2.4 inches) | 88% | low |
| February Weather | -3°C (27°F) | 68 mm (2.7 inches) | 87% | moderate |
| March Weather | 2°C (36°F) | 68 mm (2.7 inches) | 85% | moderate |
| April Weather | 8°C (46°F) | 95 mm (3.8 inches) | 86% | very high |
| May Weather | 15°C (59°F) | 110 mm (4.3 inches) | 80% | very high |
| June Weather | 21°C (69°F) | 104 mm (4.1 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 93 mm (3.7 inches) | 80% | very high |
| August Weather | 22°C (72°F) | 92 mm (3.6 inches) | 80% | very high |
| September Weather | 18°C (65°F) | 78 mm (3.1 inches) | 80% | high |
| October Weather | 12°C (53°F) | 107 mm (4.2 inches) | 84% | moderate |
| November Weather | 4°C (39°F) | 71 mm (2.8 inches) | 89% | moderate |
| December Weather | 0°C (32°F) | 53 mm (2.1 inches) | 86% | low |