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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 6°C (42°F). Be prepared for temperature swings, as it can dip as low as -12°C (10°F) or rise to a pleasant 24°C (75°F). Expect some moisture during your stay, with an average precipitation of 40 mm (1.6 in) spread over 5 days. Additionally, the air tends to be quite humid, with an average humidity level of 85%.

December Temperature in Oswego

In December in Oswego, the average temperature is 6°C (42°F). Maximums can reach 24°C (75°F) and minimums can drop to as low as -12°C (10°F). Be prepared for a wide range of temperatures if you're planning to travel during this month.

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 6°C (42°F), with highs reaching up to 24°C (75°F) and lows dropping to around -12°C (10°F).
JanFebMarAprMayJunJulAugSepOctNovDec363851576878817974604842
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 precipitation amount is 40 mm (1.6 in) over the course of 5 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 40 mm (1.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec67651281242399698117941275340
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 85%. With an average temperature of 6°C (42°F), this humidity feels like walking through a thick mist, making even short strolls feel damp and chilly, which can be uncomfortable for traveling.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%71%74%83%83%81%73%67%72%82%85%
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 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 Oswego, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35710101111109753
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 Weather2°C (36°F)67 mm (2.6 inches)77%moderate
February Weather3°C (38°F)65 mm (2.6 inches)76%moderate
March Weather10°C (51°F)128 mm (5.0 inches)71%high
April Weather14°C (58°F)124 mm (4.9 inches)73%very high
May Weather20°C (68°F)239 mm (9.4 inches)83%very high
June Weather26°C (78°F)96 mm (3.8 inches)83%extreme
July Weather27°C (81°F)98 mm (3.8 inches)81%extreme
August Weather26°C (79°F)117 mm (4.6 inches)73%very high
September Weather24°C (75°F)94 mm (3.7 inches)67%very high
October Weather16°C (60°F)127 mm (5.0 inches)72%high
November Weather9°C (48°F)53 mm (2.1 inches)82%moderate
December Weather6°C (42°F)40 mm (1.6 inches)85%moderate

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