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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 9°C (49°F), with fluctuations that can see lows of -6°C (21°F) and highs reaching a balmy 31°C (88°F). Rainfall is a frequent visitor, with 33 mm (1.3 in) of precipitation spread over 4 days, and the air carries a notable average humidity of 85%. Prepare accordingly for a month of varied weather!

December Temperature in Seymour

In December in Seymour, the average temperature is 9°C (49°F), with maximums reaching 31°C (88°F) and minimums dropping as low as -6°C (21°F). This wide range makes it essential to pack for both warm and chilly conditions when traveling.

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 9°C (49°F), with highs reaching up to 31°C (88°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec444659647582868578665448
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 33 mm (1.3 in) over a span of 4 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 33 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec34326872118491850105743033
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 85%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making every step outside a challenge as the moisture in the air weighs heavily and lingers, transforming even simple outings into a quest for comfort.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%74%75%80%80%75%67%64%70%82%85%
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 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 Seymour for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111121110864
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 Weather7°C (44°F)34 mm (1.3 inches)77%moderate
February Weather8°C (46°F)32 mm (1.3 inches)76%high
March Weather15°C (59°F)68 mm (2.7 inches)74%very high
April Weather18°C (65°F)72 mm (2.8 inches)75%very high
May Weather24°C (75°F)118 mm (4.7 inches)80%extreme
June Weather28°C (83°F)49 mm (1.9 inches)80%extreme
July Weather30°C (87°F)18 mm (0.7 inches)75%extreme
August Weather29°C (85°F)50 mm (2.0 inches)67%extreme
September Weather25°C (78°F)105 mm (4.1 inches)64%very high
October Weather19°C (66°F)74 mm (2.9 inches)70%very high
November Weather12°C (55°F)30 mm (1.2 inches)82%high
December Weather9°C (49°F)33 mm (1.3 inches)85%moderate

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