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December Weather in Rochester, United States

Last updated: June 24, 2025

In December, the average temperature in Rochester, United States hovers around 2°C (36°F), presenting a chilly atmosphere. Temperatures can dip as low as -15°C (4°F) and reach a maximum of 17°C (63°F). Expect about 99 mm (3.9 in) of precipitation spread over 11 days, contributing to the average humidity level of 86%. Prepare for a wet and cool month!

December Temperature in Rochester

In December in Rochester, the average temperature is 2°C (36°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -15°C (4°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their visit.

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 2°C (36°F), with highs reaching up to 17°C (63°F) and lows dropping to around -15°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec303440506270747267564135
Data source: Temperature data for Rochester generated using information from the Copernicus Climate Change Service.
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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 99 mm (3.9 in) over the course of 11 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 99 mm (3.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec95113103133136136135881171249799
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Rochester

In Rochester in December, humidity is 86%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm for travel.

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 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-1°C (30°F)95 mm (3.7 inches)88%moderate
February Weather1°C (34°F)113 mm (4.5 inches)88%moderate
March Weather5°C (41°F)103 mm (4.1 inches)87%high
April Weather10°C (51°F)133 mm (5.2 inches)87%very high
May Weather16°C (62°F)136 mm (5.4 inches)81%very high
June Weather21°C (70°F)136 mm (5.3 inches)83%very high
July Weather24°C (75°F)135 mm (5.3 inches)82%very high
August Weather22°C (73°F)88 mm (3.5 inches)76%very high
September Weather19°C (67°F)117 mm (4.6 inches)77%very high
October Weather14°C (57°F)124 mm (4.9 inches)82%high
November Weather5°C (42°F)97 mm (3.8 inches)89%moderate
December Weather2°C (36°F)99 mm (3.9 inches)86%low

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