Last updated: June 24, 2025
In December, the average temperature in Rochester, United States hovers around 1°C (35°F). Expect chilly nights with a minimum temperature that can dip to -22°C (-7°F), while daytime highs may reach up to 17°C (63°F). With 65 mm (2.5 in) of precipitation spread over 9 days, your umbrella might come in handy. Additionally, average humidity levels sit at a brisk 86%, adding to the season's characteristic chill.
In December, in Rochester, the average temperature is 1°C (35°F). Maximum temperatures can reach 17°C (63°F), while minimums can plummet to as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Rochester in December, the precipitation amount is 65 mm (2.5 in) over the course of 9 days.
In Rochester in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.
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 | -2°C (28°F) | 75 mm (2.9 inches) | 85% | moderate |
| February Weather | -1°C (30°F) | 77 mm (3.0 inches) | 85% | moderate |
| March Weather | 5°C (41°F) | 102 mm (4.0 inches) | 86% | high |
| April Weather | 10°C (50°F) | 99 mm (3.9 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 155 mm (6.1 inches) | 81% | very high |
| June Weather | 23°C (73°F) | 112 mm (4.4 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 111 mm (4.4 inches) | 81% | very high |
| August Weather | 23°C (73°F) | 104 mm (4.1 inches) | 79% | very high |
| September Weather | 20°C (68°F) | 67 mm (2.6 inches) | 78% | very high |
| October Weather | 13°C (56°F) | 110 mm (4.3 inches) | 81% | high |
| November Weather | 5°C (41°F) | 79 mm (3.1 inches) | 89% | moderate |
| December Weather | 1°C (35°F) | 65 mm (2.5 inches) | 86% | low |