December Weather in Rochester, United States

Last updated: June 24, 2025

In Rochester, United States, the average temperature in December hovers around 5°C (40°F), with minimum lows of -6°C (21°F) and maximum highs reaching 13°C (56°F). Expect precipitation of 198 mm (7.8 in) spread over 20 days, contributing to a cozy yet humid atmosphere with an average humidity of 87%.

December Temperature in Rochester

In December in Rochester, the average temperature is 5°C (40°F). Maximums can reach 13°C (56°F), while minimums can dip as low as -6°C (21°F). Be sure to pack warm clothing to stay comfortable while exploring the beautiful sights!

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 5°C (40°F), with highs reaching up to 13°C (56°F) and lows dropping to around -6°C (21°F).

Data source: Temperature data for Rochester generated using information from the Copernicus Climate Change Service.

December Precipitation in Rochester

In Rochester in December, the precipitation amount is 198 mm (7.8 in) during 20 days, indicating a significant level of rainfall for the region throughout that period.

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 198 mm (7.8 inches) of precipitation spread over approximately 20 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Rochester

In Rochester in December, humidity is 87%. With an average temperature of 5°C (40°F), this humidity feels like a damp chill that wraps around you, making outdoor excursions less enjoyable and requiring extra layers to stay comfortable while exploring.

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.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	186 mm (7.3 inches)	86%	low
February Weather	4°C (40°F)	169 mm (6.7 inches)	84%	moderate
March Weather	7°C (45°F)	137 mm (5.4 inches)	85%	moderate
April Weather	10°C (49°F)	119 mm (4.7 inches)	83%	high
May Weather	13°C (56°F)	71 mm (2.8 inches)	84%	very high
June Weather	16°C (60°F)	54 mm (2.1 inches)	84%	very high
July Weather	18°C (65°F)	12 mm (0.5 inches)	82%	very high
August Weather	19°C (66°F)	15 mm (0.6 inches)	73%	very high
September Weather	16°C (61°F)	88 mm (3.5 inches)	74%	high
October Weather	10°C (51°F)	132 mm (5.2 inches)	83%	moderate
November Weather	7°C (45°F)	181 mm (7.1 inches)	86%	moderate
December Weather	5°C (40°F)	198 mm (7.8 inches)	87%	low