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December Weather in Ottumwa, United States

Last updated: June 24, 2025

In December, the average temperature in Ottumwa, United States hovers around 0°C (33°F). However, you might experience a minimum of -22°C (-8°F) and a surprising maximum of 23°C (74°F). Expect 40 mm (1.6 in) of precipitation spread over 5 days, with an average humidity of 83%, making for a refreshing yet chilly month ahead!

December Temperature in Ottumwa

In December in Ottumwa, the average temperature is 0°C (33°F). Maximums can reach 23°C (74°F) and minimums can be as low as -22°C (-8°F). Travelers should be prepared for a wide range of temperatures and dress accordingly for both warm and cold conditions.

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

The chart illustrates December temperature patterns in Ottumwa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ottumwa, December typically has an average temperature of 0°C (33°F), with highs reaching up to 23°C (74°F) and lows dropping to around -22°C (-8°F).
JanFebMarAprMayJunJulAugSepOctNovDec242641506375787569544033
Data source: Temperature data for Ottumwa 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 Ottumwa

In Ottumwa in December, the precipitation amount is 40 mm (1.6 in) over the course of 5 days.

December Precipitation Trends in Ottumwa

The chart displays monthly precipitation patterns in Ottumwa, 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 Ottumwa, December typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec5050937715113774751291255340
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Ottumwa

In Ottumwa in December, humidity is 83%. With an average temperature of 0°C (33°F), this humidity feels like a cold, damp chill that cuts through layers of clothing, making travel uncomfortable and brisk as each breath fills the lungs with icy moisture.

December Average Humidity in Ottumwa

This chart illustrates the average monthly humidity levels in Ottumwa, 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 Ottumwa is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Ottumwa

In Ottumwa 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 Ottumwa, you can check the information here.

Maximum UV Index Levels in Ottumwa for December

The chart shows the monthly maximum UV Index (UVI) for Ottumwa 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 Ottumwa typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Ottumwa 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 Ottumwa Compares to Other Months

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

This table compares monthly weather conditions in Ottumwa, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)50 mm (2.0 inches)78%moderate
February Weather-3°C (27°F)50 mm (2.0 inches)80%moderate
March Weather5°C (41°F)93 mm (3.7 inches)77%high
April Weather10°C (51°F)77 mm (3.0 inches)77%very high
May Weather17°C (64°F)151 mm (5.9 inches)77%very high
June Weather24°C (75°F)137 mm (5.4 inches)81%extreme
July Weather25°C (78°F)74 mm (2.9 inches)81%very high
August Weather24°C (75°F)75 mm (3.0 inches)77%very high
September Weather21°C (69°F)129 mm (5.1 inches)73%very high
October Weather12°C (54°F)125 mm (4.9 inches)75%high
November Weather4°C (40°F)53 mm (2.1 inches)85%moderate
December Weather0°C (33°F)40 mm (1.6 inches)83%moderate

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