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December Weather in Herkimer, United States

Last updated: June 24, 2025

In Herkimer, United States, the average temperature in December hovers around -2°C (28°F). However, be prepared for extremes, as temperatures can drop to a chilling -24°C (-12°F) or climb up to a surprisingly mild 16°C (61°F). Expect 114 mm (4.5 in) of precipitation over approximately 16 days, and brace yourself for an average humidity of 86% that can make the cold feel even more intense.

December Temperature in Herkimer

In December in Herkimer, the average temperature is -2°C (28°F), with maximums reaching up to 16°C (61°F) and minimums dropping as low as -24°C (-12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their time in Herkimer.

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

The chart illustrates December temperature patterns in Herkimer, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Herkimer, December typically has an average temperature of -2°C (28°F), with highs reaching up to 16°C (61°F) and lows dropping to around -24°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec232632445765706861513628
Data source: Temperature data for Herkimer 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 Herkimer

In Herkimer in December, the precipitation amount is 114 mm (4.5 in), occurring over a span of 16 days.

December Precipitation Trends in Herkimer

The chart displays monthly precipitation patterns in Herkimer, 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 Herkimer, December typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec951109613213412515413799174119114
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Herkimer

In Herkimer in December, humidity is 86%. With an average temperature of -2°C (28°F), this humidity feels like a dense fog wrapping around you, making it feel even colder and creating an uncomfortable chill that can dampen any plans for outdoor exploration.

December Average Humidity in Herkimer

This chart illustrates the average monthly humidity levels in Herkimer, 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 Herkimer is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Herkimer

In Herkimer 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 Herkimer, you can visit Hourly UV Index in Herkimer.

Maximum UV Index Levels in Herkimer for December

The chart shows the monthly maximum UV Index (UVI) for Herkimer 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 Herkimer typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910998632
Data source: Herkimer 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 Herkimer Compares to Other Months

Weather in Herkimer varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Herkimer, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Herkimer, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)95 mm (3.7 inches)90%moderate
February Weather-3°C (26°F)109 mm (4.3 inches)90%moderate
March Weather0°C (32°F)96 mm (3.8 inches)87%high
April Weather7°C (45°F)132 mm (5.2 inches)88%very high
May Weather14°C (57°F)134 mm (5.3 inches)82%very high
June Weather18°C (65°F)125 mm (4.9 inches)79%very high
July Weather21°C (70°F)154 mm (6.1 inches)78%very high
August Weather20°C (68°F)137 mm (5.4 inches)76%very high
September Weather16°C (62°F)99 mm (3.9 inches)78%very high
October Weather11°C (51°F)174 mm (6.8 inches)84%high
November Weather2°C (37°F)119 mm (4.7 inches)89%moderate
December Weather-2°C (28°F)114 mm (4.5 inches)86%low

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