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December Weather in Seymour, United States

Last updated: June 24, 2025

In December, the average temperature in Seymour, United States is a cool 7°C (45°F), with a minimum that can drop to -13°C (9°F) and a maximum reaching 23°C (74°F). Expect precipitation of about 131 mm (5.1 in) over 11 days, contributing to an average humidity of a damp 88%.

December Temperature in Seymour

In December in Seymour, the average temperature is 7°C (45°F), with maximums reaching 23°C (74°F) and minimums dropping as low as -13°C (9°F). It's advisable to pack layers to accommodate the wide temperature range when traveling during this time.

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 7°C (45°F), with highs reaching up to 23°C (74°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec414652596875797773634844
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 131 mm (5.1 in) over the course of 11 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 131 mm (5.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec941551451301071071071119011975131
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 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 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 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 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.
JanFebMarAprMayJunJulAugSepOctNovDec36810111111109753
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 Weather5°C (41°F)94 mm (3.7 inches)86%moderate
February Weather8°C (46°F)155 mm (6.1 inches)86%high
March Weather11°C (52°F)145 mm (5.7 inches)86%very high
April Weather15°C (59°F)130 mm (5.1 inches)82%very high
May Weather20°C (69°F)107 mm (4.2 inches)85%extreme
June Weather24°C (75°F)107 mm (4.2 inches)85%extreme
July Weather26°C (79°F)107 mm (4.2 inches)83%extreme
August Weather25°C (77°F)111 mm (4.4 inches)76%very high
September Weather23°C (73°F)90 mm (3.5 inches)76%very high
October Weather17°C (63°F)119 mm (4.7 inches)80%high
November Weather9°C (49°F)75 mm (3.0 inches)88%moderate
December Weather7°C (45°F)131 mm (5.1 inches)88%moderate

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