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December Weather in Harriman, United States

Last updated: June 24, 2025

In December, the average temperature in Harriman, United States hovers around 7°C (45°F). Expect chilly days, with minimum temperatures dipping to -9°C (16°F) and occasional peaks reaching 23°C (73°F). Precipitation is fairly frequent, totaling 137 mm (5.4 in) over 11 days, and the air maintains an average humidity level of 88%. Prepare for a damp and cool atmosphere!

December Temperature in Harriman

In December in Harriman, the average temperature is 7°C (45°F), with maximums reaching 23°C (73°F) and minimums dropping as low as -9°C (16°F). Be prepared for a wide range of temperatures when traveling to Harriman during this month.

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

The chart illustrates December temperature patterns in Harriman, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harriman, December typically has an average temperature of 7°C (45°F), with highs reaching up to 23°C (73°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec404652596974787673634845
Data source: Temperature data for Harriman 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 Harriman

In Harriman in December, the total precipitation amount reaches 137 mm (5.4 in) over a span of 11 days.

December Precipitation Trends in Harriman

The chart displays monthly precipitation patterns in Harriman, 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 Harriman, December typically receives around 137 mm (5.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec981781541421181141221329512078137
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Harriman

In Harriman in December humidity is 88%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through a heavy, thick atmosphere that clings to your skin.

December Average Humidity in Harriman

This chart illustrates the average monthly humidity levels in Harriman, 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 Harriman is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%82%85%85%83%76%76%80%88%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Harriman

In Harriman in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Harriman, you can check the information here.

Maximum UV Index Levels in Harriman for December

The chart shows the monthly maximum UV Index (UVI) for Harriman 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 Harriman typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
Data source: Harriman 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 Harriman Compares to Other Months

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

This table compares monthly weather conditions in Harriman, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)98 mm (3.9 inches)86%moderate
February Weather8°C (46°F)178 mm (7.0 inches)86%high
March Weather11°C (52°F)154 mm (6.1 inches)86%very high
April Weather15°C (59°F)142 mm (5.6 inches)82%very high
May Weather20°C (69°F)118 mm (4.6 inches)85%extreme
June Weather24°C (75°F)114 mm (4.5 inches)85%extreme
July Weather26°C (78°F)122 mm (4.8 inches)83%extreme
August Weather25°C (77°F)132 mm (5.2 inches)76%very high
September Weather23°C (73°F)95 mm (3.7 inches)76%very high
October Weather17°C (63°F)120 mm (4.7 inches)80%high
November Weather9°C (49°F)78 mm (3.1 inches)88%moderate
December Weather7°C (45°F)137 mm (5.4 inches)88%moderate

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