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December Weather in Oswego, United States

Last updated: June 24, 2025

In December, the average temperature in Oswego, United States hovers around 1°C (35°F), with extremes ranging from a chilly -14°C (7°F) to a mild 15°C (59°F). Expect about 140 mm (5.5 in) of precipitation over 20 days, contributing to a high average humidity of 86%. Prepare for a cool and wet month!

December Temperature in Oswego

In December in Oswego, the average temperature is 1°C (35°F). The maximum can reach 15°C (59°F) and the minimum can be as low as -14°C (7°F). This means travelers should be prepared for a chilly climate with fluctuating temperatures, making layers and proper winter gear essential for comfort.

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

The chart illustrates December temperature patterns in Oswego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oswego, December typically has an average temperature of 1°C (35°F), with highs reaching up to 15°C (59°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934435262727266554234
Data source: Temperature data for Oswego 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 Oswego

In Oswego in December, the total precipitation amount is 140 mm (5.5 in) spread over the course of 20 days.

December Precipitation Trends in Oswego

The chart displays monthly precipitation patterns in Oswego, 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 Oswego, December typically receives around 140 mm (5.5 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec108104921271179017711995187137140
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oswego

In Oswego in December, humidity is 86%. With an average temperature of 1°C (35°F), this humidity feels like a biting chill that wraps around you, making outdoor exploration uncomfortable and requiring extra layers to stay warm while navigating the damp air.

December Average Humidity in Oswego

This chart illustrates the average monthly humidity levels in Oswego, 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 Oswego is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%87%88%82%79%78%76%78%84%89%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oswego

In Oswego in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Oswego, you can visit Hourly UV Index in Oswego.

Maximum UV Index Levels in Oswego for December

The chart shows the monthly maximum UV Index (UVI) for Oswego 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 Oswego typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2468910997532
Data source: Oswego 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 Oswego Compares to Other Months

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

This table compares monthly weather conditions in Oswego, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)108 mm (4.3 inches)90%low
February Weather-2°C (29°F)104 mm (4.1 inches)90%moderate
March Weather1°C (34°F)92 mm (3.6 inches)87%high
April Weather6°C (43°F)127 mm (5.0 inches)88%very high
May Weather11°C (52°F)117 mm (4.6 inches)82%very high
June Weather17°C (62°F)90 mm (3.6 inches)79%very high
July Weather22°C (72°F)177 mm (7.0 inches)78%very high
August Weather22°C (72°F)119 mm (4.7 inches)76%very high
September Weather19°C (66°F)95 mm (3.8 inches)78%high
October Weather13°C (56°F)187 mm (7.4 inches)84%moderate
November Weather6°C (42°F)137 mm (5.4 inches)89%moderate
December Weather1°C (35°F)140 mm (5.5 inches)86%low

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