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December Weather in Onawa, United States

Last updated: June 24, 2025

In December, the average temperature in Onawa, United States hovers around -1°C (30°F). However, be prepared for a wide range of temperatures, with minimums plunging to -23°C (-9°F) and maximums soaring up to 21°C (70°F). Expect about 40 mm (1.6 in) of precipitation spread over 4 days, and note that the average humidity sits at a cozy 83%.

December Temperature in Onawa

In December in Onawa, the average temperature is -1°C (30°F). Maximums can reach 21°C (70°F) and minimums can dip as low as -23°C (-9°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to enjoy their trip.

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

The chart illustrates December temperature patterns in Onawa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onawa, December typically has an average temperature of -1°C (30°F), with highs reaching up to 21°C (70°F) and lows dropping to around -23°C (-9°F).
JanFebMarAprMayJunJulAugSepOctNovDec242439496275777368523830
Data source: Temperature data for Onawa 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 Onawa

In Onawa in December, the precipitation amount is 40 mm (1.6 in) spread over a duration of 4 days.

December Precipitation Trends in Onawa

The chart displays monthly precipitation patterns in Onawa, 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 Onawa, December typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec273383711421146411091942940
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Onawa

In Onawa in December humidity is 83%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill that seeps through your layers, making outdoor activities uncomfortable and encouraging travelers to seek shelter indoors.

December Average Humidity in Onawa

This chart illustrates the average monthly humidity levels in Onawa, 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 Onawa is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Onawa

In Onawa 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 Onawa, you can visit Hourly UV Index in Onawa.

Maximum UV Index Levels in Onawa for December

The chart shows the monthly maximum UV Index (UVI) for Onawa 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 Onawa typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589111098642
Data source: Onawa 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 Onawa Compares to Other Months

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

This table compares monthly weather conditions in Onawa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)27 mm (1.1 inches)76%moderate
February Weather-5°C (24°F)33 mm (1.3 inches)80%moderate
March Weather4°C (40°F)83 mm (3.3 inches)73%moderate
April Weather9°C (49°F)71 mm (2.8 inches)74%very high
May Weather16°C (62°F)142 mm (5.6 inches)78%very high
June Weather24°C (75°F)114 mm (4.5 inches)82%extreme
July Weather25°C (77°F)64 mm (2.5 inches)83%very high
August Weather23°C (74°F)110 mm (4.3 inches)80%very high
September Weather20°C (69°F)91 mm (3.6 inches)75%very high
October Weather11°C (52°F)94 mm (3.7 inches)75%high
November Weather4°C (39°F)29 mm (1.1 inches)82%moderate
December Weather-1°C (30°F)40 mm (1.6 inches)83%low

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