Last updated: June 24, 2025
In December, the average temperature in Rochester, United States hovers around -4°C (25°F). Expect chilly conditions, with the minimum dipping as low as -26°C (-15°F), while the maximum may reach a surprising 18°C (65°F). With an average humidity of 83%, the month also sees about 42 mm (1.6 in) of precipitation spread over 7 days.
In December in Rochester, the average temperature is -4°C (25°F). Maximums can reach 18°C (65°F), while minimums can be as low as -26°C (-15°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for their visit.
In Rochester in December, the total precipitation amount is 42 mm (1.6 in) accumulated over a span of 7 days.
In Rochester in December, humidity is 83%. With an average temperature of -4°C (25°F), this humidity feels like a chilling fog enveloping you, making every breath feel heavy and damp, which can quickly dampen the spirit of travel as you navigate the frosty landscape.
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 | -8°C (17°F) | 36 mm (1.4 inches) | 82% | moderate |
| February Weather | -8°C (18°F) | 47 mm (1.8 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 59 mm (2.3 inches) | 80% | moderate |
| April Weather | 6°C (44°F) | 88 mm (3.4 inches) | 81% | very high |
| May Weather | 15°C (59°F) | 143 mm (5.6 inches) | 74% | very high |
| June Weather | 21°C (71°F) | 135 mm (5.3 inches) | 80% | very high |
| July Weather | 23°C (74°F) | 99 mm (3.9 inches) | 80% | very high |
| August Weather | 21°C (70°F) | 118 mm (4.6 inches) | 77% | very high |
| September Weather | 18°C (64°F) | 122 mm (4.8 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 110 mm (4.3 inches) | 80% | moderate |
| November Weather | 1°C (34°F) | 47 mm (1.8 inches) | 87% | moderate |
| December Weather | -4°C (25°F) | 42 mm (1.6 inches) | 83% | low |