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December Weather in Seymour, United States

Last updated: June 24, 2025

The average temperature in Seymour, United States during December is a chilly 5°C (41°F), with frigid lows reaching -14°C (8°F) and pleasant highs peaking at 25°C (77°F). Expect around 63 mm (2.5 in) of precipitation spread over 7 days, contributing to an average humidity of a damp 87%. Prepare accordingly!

December Temperature in Seymour

In December in Seymour, the average temperature is 5°C (41°F). Maximum temperatures can reach 25°C (77°F), while minimums can drop as low as -14°C (8°F). It’s advisable to pack layers and be prepared for a wide range of weather conditions 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 5°C (41°F), with highs reaching up to 25°C (77°F) and lows dropping to around -14°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec343748546574787572584540
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 63 mm (2.5 in) over a span of 7 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 63 mm (2.5 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec809414717418310285109581377263
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 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

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.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%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.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 (34°F)80 mm (3.1 inches)81%moderate
February Weather3°C (37°F)94 mm (3.7 inches)78%high
March Weather9°C (48°F)147 mm (5.8 inches)76%high
April Weather12°C (55°F)174 mm (6.9 inches)78%very high
May Weather18°C (65°F)183 mm (7.2 inches)83%very high
June Weather23°C (75°F)102 mm (4.0 inches)83%extreme
July Weather26°C (78°F)85 mm (3.3 inches)78%extreme
August Weather24°C (76°F)109 mm (4.3 inches)68%very high
September Weather22°C (72°F)58 mm (2.3 inches)64%very high
October Weather14°C (58°F)137 mm (5.4 inches)70%high
November Weather7°C (45°F)72 mm (2.8 inches)83%moderate
December Weather5°C (41°F)63 mm (2.5 inches)87%moderate

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