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December Weather in Seymour, United States

Last updated: June 24, 2025

In December, the average temperature in Seymour, United States hovers around 4°C (39°F), with extremes reaching a chilling -17°C (2°F) at night and a pleasant 20°C (69°F) during the day. Expect around 100 mm (3.9 in) of precipitation spread across 10 days, while the air remains quite humid with an average humidity of 87%. Be prepared for a mix of cool and wet weather as you explore this unique location!

December Temperature in Seymour

In December in Seymour, the average temperature is 4°C (39°F). Maximums can reach 20°C (69°F) and minimums can be as low as -17°C (2°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack layers for both warm and cold conditions.

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

The chart illustrates December temperature patterns in Seymour, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Seymour, December typically has an average temperature of 4°C (39°F), with highs reaching up to 20°C (69°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec333745546674787671594339
Data source: Temperature data for Seymour 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 Seymour

In Seymour in December, the precipitation amount is 100 mm (3.9 in) over a span of 10 days.

December Precipitation Trends in Seymour

The chart displays monthly precipitation patterns in Seymour, 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 Seymour, December typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8210913812113312610298869798100
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Seymour

In Seymour in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

December Average Humidity in Seymour

This chart illustrates the average monthly humidity levels in Seymour, 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 Seymour is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Seymour

In Seymour 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 Seymour, you can check the information here.

Maximum UV Index Levels in Seymour for December

The chart shows the monthly maximum UV Index (UVI) for Seymour 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 Seymour typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Seymour 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 Seymour Compares to Other Months

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

This table compares monthly weather conditions in Seymour, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)82 mm (3.2 inches)87%moderate
February Weather3°C (37°F)109 mm (4.3 inches)85%moderate
March Weather7°C (46°F)138 mm (5.4 inches)86%high
April Weather12°C (55°F)121 mm (4.8 inches)84%very high
May Weather19°C (66°F)133 mm (5.2 inches)79%very high
June Weather24°C (75°F)126 mm (5.0 inches)82%extreme
July Weather26°C (78°F)102 mm (4.0 inches)79%very high
August Weather24°C (76°F)98 mm (3.9 inches)70%very high
September Weather22°C (71°F)86 mm (3.4 inches)69%very high
October Weather15°C (59°F)97 mm (3.8 inches)76%high
November Weather6°C (44°F)98 mm (3.9 inches)88%moderate
December Weather4°C (39°F)100 mm (3.9 inches)87%moderate

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