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December Weather in Seneca, United States

Last updated: June 24, 2025

In December, the average temperature in Seneca, United States is a brisk 8°C (47°F). Expect a wide range, with minimums plummeting to -7°C (19°F) and maximums soaring up to 24°C (75°F). Be prepared for wet weather, as precipitation averages 151 mm (6.0 in) over 10 days. With an average humidity of 88%, it's a month that feels both chilly and damp.

December Temperature in Seneca

In December in Seneca, the average temperature is 8°C (47°F), with maximums reaching up to 24°C (75°F) and minimums dipping as low as -7°C (19°F). Be prepared for a wide range of temperatures, making layering essential for your travel plans.

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

The chart illustrates December temperature patterns in Seneca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seneca, December typically has an average temperature of 8°C (47°F), with highs reaching up to 24°C (75°F) and lows dropping to around -7°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec444954616975797874645147
Data source: Temperature data for Seneca 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 Seneca

In Seneca in December, the total precipitation amount is 151 mm (6.0 in) spread over a duration of 10 days.

December Precipitation Trends in Seneca

The chart displays monthly precipitation patterns in Seneca, 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 Seneca, December typically receives around 151 mm (6.0 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec117167121136141929212713216797151
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Seneca

In Seneca in December, humidity is 88%. With an average temperature of 8°C (47°F), this humidity feels like a thick, damp blanket wrapping around you, making even short walks feel heavy and uninviting for travel.

December Average Humidity in Seneca

This chart illustrates the average monthly humidity levels in Seneca, 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 Seneca 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 Seneca

In Seneca in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Seneca for better planning.

Maximum UV Index Levels in Seneca for December

The chart shows the monthly maximum UV Index (UVI) for Seneca 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 Seneca typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47811111111109864
Data source: Seneca 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 Seneca Compares to Other Months

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

This table compares monthly weather conditions in Seneca, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)117 mm (4.6 inches)86%moderate
February Weather9°C (49°F)167 mm (6.6 inches)86%high
March Weather12°C (54°F)121 mm (4.7 inches)86%very high
April Weather16°C (61°F)136 mm (5.4 inches)82%extreme
May Weather21°C (70°F)141 mm (5.5 inches)85%extreme
June Weather24°C (76°F)92 mm (3.6 inches)85%extreme
July Weather26°C (80°F)92 mm (3.6 inches)83%extreme
August Weather26°C (78°F)127 mm (5.0 inches)76%very high
September Weather23°C (74°F)132 mm (5.2 inches)76%very high
October Weather18°C (65°F)167 mm (6.6 inches)80%very high
November Weather11°C (52°F)97 mm (3.8 inches)88%high
December Weather8°C (47°F)151 mm (6.0 inches)88%moderate

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