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December Weather in O'Brien, United States

Last updated: June 24, 2025

In December, the average temperature in O'Brien, United States hovers around 3°C (38°F), with a minimum that can dip to -9°C (16°F) and a maximum reaching up to 19°C (67°F). Expect 226 mm (8.9 in) of precipitation spread over 13 days, alongside a high average humidity of 86%. Dress accordingly to embrace the chill and occasional rainfall!

December Temperature in O'Brien

In December in O'Brien, the average temperature is 3°C (38°F), with maximums reaching 19°C (67°F) and minimums dropping as low as -9°C (16°F). Travelers should be prepared for a wide range of temperatures and pack accordingly to stay comfortable during their visit.

December Weather in O'Brien: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in O'Brien, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In O'Brien, December typically has an average temperature of 3°C (38°F), with highs reaching up to 19°C (67°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec393941475462706962534538
Data source: Temperature data for O'Brien 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 O'Brien

In O'Brien in December, the total precipitation amount is 226 mm (8.9 in) over a span of 13 days.

December Precipitation Trends in O'Brien

The chart displays monthly precipitation patterns in O'Brien, 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 O'Brien, December typically receives around 226 mm (8.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec2942792131587637346488202226
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in O'Brien

In O'Brien in December humidity is 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.

December Average Humidity in O'Brien

This chart illustrates the average monthly humidity levels in O'Brien, 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 O'Brien is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in O'Brien

In O'Brien 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 O'Brien, you can visit Hourly UV Index in O'Brien.

Maximum UV Index Levels in O'Brien for December

The chart shows the monthly maximum UV Index (UVI) for O'Brien 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 O'Brien typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478111110108642
Data source: O'Brien 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 O'Brien Compares to Other Months

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

This table compares monthly weather conditions in O'Brien, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)294 mm (11.6 inches)86%moderate
February Weather4°C (39°F)279 mm (11.0 inches)85%moderate
March Weather5°C (42°F)213 mm (8.4 inches)85%high
April Weather8°C (48°F)158 mm (6.2 inches)82%very high
May Weather12°C (54°F)75 mm (3.0 inches)81%extreme
June Weather17°C (62°F)37 mm (1.5 inches)79%extreme
July Weather21°C (70°F)3 mm (0.1 inches)70%very high
August Weather21°C (70°F)4 mm (0.2 inches)60%very high
September Weather17°C (62°F)64 mm (2.5 inches)62%very high
October Weather11°C (53°F)88 mm (3.5 inches)72%high
November Weather7°C (45°F)202 mm (8.0 inches)87%moderate
December Weather3°C (38°F)226 mm (8.9 inches)86%low

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