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December Weather in Oskaloosa, United States

Last updated: June 24, 2025

In December, the average temperature in Oskaloosa, United States hovers around 3°C (37°F). Visitors should prepare for a range of conditions, as temperatures can dip to a chilly -19°C (-1°F) or rise to a pleasant 22°C (72°F). Expect some rain too, with an average precipitation amount of 33 mm (1.3 in) spread over about 3 days. Don't forget, the air is quite damp, with an average humidity of 84%!

December Temperature in Oskaloosa

In December in Oskaloosa, the average temperature is 3°C (37°F). Maximums can reach up to 22°C (72°F), while minimums can drop as low as -19°C (-1°F). Visitors should be prepared for a wide range of temperatures and pack accordingly for their trip.

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

The chart illustrates December temperature patterns in Oskaloosa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Oskaloosa, December typically has an average temperature of 3°C (37°F), with highs reaching up to 22°C (72°F) and lows dropping to around -19°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec303246546577807671564337
Data source: Temperature data for Oskaloosa 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 Oskaloosa

In Oskaloosa in December, the precipitation amount is 33 mm (1.3 in) over the course of 3 days.

December Precipitation Trends in Oskaloosa

The chart displays monthly precipitation patterns in Oskaloosa, 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 Oskaloosa, December typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec45311008921812591136851154133
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Oskaloosa

In Oskaloosa in December humidity is 84%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions brisk and invigorating, yet requiring extra layers to stay comfortable.

December Average Humidity in Oskaloosa

This chart illustrates the average monthly humidity levels in Oskaloosa, 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 Oskaloosa is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%78%70%73%82%82%81%78%71%71%81%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Oskaloosa

In Oskaloosa 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 Oskaloosa, you can check the information here.

Maximum UV Index Levels in Oskaloosa for December

The chart shows the monthly maximum UV Index (UVI) for Oskaloosa 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 Oskaloosa typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Oskaloosa 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 Oskaloosa Compares to Other Months

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

This table compares monthly weather conditions in Oskaloosa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)45 mm (1.8 inches)76%moderate
February Weather0°C (32°F)31 mm (1.2 inches)77%moderate
March Weather8°C (46°F)100 mm (3.9 inches)70%high
April Weather12°C (54°F)88 mm (3.5 inches)73%very high
May Weather19°C (66°F)218 mm (8.6 inches)82%very high
June Weather25°C (77°F)125 mm (4.9 inches)82%extreme
July Weather26°C (80°F)91 mm (3.6 inches)81%extreme
August Weather25°C (77°F)136 mm (5.3 inches)78%very high
September Weather22°C (72°F)85 mm (3.3 inches)71%very high
October Weather13°C (56°F)115 mm (4.5 inches)71%high
November Weather6°C (44°F)41 mm (1.6 inches)81%moderate
December Weather3°C (37°F)33 mm (1.3 inches)84%moderate

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