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December Weather in Seymour, United States

Last updated: June 24, 2025

In Seymour, United States, the average temperature in December hovers around 0°C (33°F). Expect minimums plunging to -25°C (-13°F) and maximums peaking at 23°C (73°F). Rainfall is moderate, with an average precipitation of 35 mm (1.4 in) spread over 4 days. Don't forget, the average humidity stands at a notable 83%, contributing to the overall chill of the season.

December Temperature in Seymour

In December in Seymour, the average temperature is 0°C (33°F). Maximum temperatures can reach 23°C (73°F) while minimums can plummet to as low as -25°C (-13°F). Travelers should be prepared for a wide range of temperatures and dress in layers to ensure comfort during their visit.

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 0°C (33°F), with highs reaching up to 23°C (73°F) and lows dropping to around -25°C (-13°F).
JanFebMarAprMayJunJulAugSepOctNovDec252741506375787569544033
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 35 mm (1.4 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 35 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec4849987514512389781251335336
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 83%. With an average temperature of 0°C (33°F), this humidity feels like a cold, damp chill that cuts through layers of clothing, making travel uncomfortable and brisk as each breath fills the lungs with icy moisture.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
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 Weather-4°C (25°F)48 mm (1.9 inches)78%moderate
February Weather-3°C (27°F)49 mm (1.9 inches)80%moderate
March Weather5°C (42°F)98 mm (3.9 inches)77%high
April Weather10°C (51°F)75 mm (3.0 inches)77%very high
May Weather17°C (64°F)145 mm (5.7 inches)77%very high
June Weather24°C (75°F)122 mm (4.8 inches)81%extreme
July Weather26°C (78°F)89 mm (3.5 inches)81%very high
August Weather24°C (75°F)78 mm (3.1 inches)77%very high
September Weather21°C (69°F)125 mm (4.9 inches)73%very high
October Weather12°C (54°F)132 mm (5.2 inches)75%high
November Weather4°C (40°F)53 mm (2.1 inches)85%moderate
December Weather0°C (33°F)35 mm (1.4 inches)83%moderate

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