nomadseason

December Weather in Rochester, United States

Last updated: June 24, 2025

In December, the average temperature in Rochester, United States hovers around 1°C (34°F), with lows reaching as frigid as -14°C (7°F) and highs peaking at 17°C (62°F). Expect 107 mm (4.2 in) of precipitation over approximately 19 days, contributing to a notably high average humidity of 87%. Prepare for a chilly, damp month!

December Temperature in Rochester

In December in Rochester, the average temperature is 1°C (34°F), with a maximum that can reach 17°C (62°F) and a minimum that can drop as low as -14°C (7°F). Be prepared for a wide range of temperatures when traveling during this time, and pack accordingly for both cold and warmer conditions.

December Weather in Rochester: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Rochester, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rochester, December typically has an average temperature of 1°C (34°F), with highs reaching up to 17°C (62°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec283035435364727266554134
Data source: Temperature data for Rochester generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Rochester

In Rochester in December, the precipitation amount is 107 mm (4.2 in) over the course of 19 days.

December Precipitation Trends in Rochester

The chart displays monthly precipitation patterns in Rochester, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Rochester, December typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec909181117101741309077159107107
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Rochester

In Rochester in December humidity is 87%. With an average temperature of 1°C (34°F), this humidity feels like a chilling blanket enveloping you, making every step outside feel heavy and damp, and leaving you longing for warmth and comfort while traveling.

December Average Humidity in Rochester

This chart illustrates the average monthly humidity levels in Rochester, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Rochester is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Rochester

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.

Maximum UV Index Levels in Rochester for December

The chart shows the monthly maximum UV Index (UVI) for Rochester in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Rochester typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24581010997532
Data source: Rochester December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Rochester Compares to Other Months

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.

This table compares monthly weather conditions in Rochester, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)90 mm (3.6 inches)91%low
February Weather-1°C (30°F)91 mm (3.6 inches)91%moderate
March Weather2°C (35°F)81 mm (3.2 inches)88%moderate
April Weather6°C (44°F)117 mm (4.6 inches)88%very high
May Weather12°C (54°F)100 mm (4.0 inches)82%very high
June Weather18°C (64°F)74 mm (2.9 inches)79%very high
July Weather22°C (72°F)130 mm (5.1 inches)77%very high
August Weather22°C (72°F)90 mm (3.5 inches)72%very high
September Weather19°C (66°F)77 mm (3.0 inches)76%high
October Weather13°C (56°F)159 mm (6.3 inches)83%moderate
November Weather5°C (42°F)107 mm (4.2 inches)88%moderate
December Weather1°C (34°F)107 mm (4.2 inches)87%low

Compare Rochester's Climate with Cities Worldwide