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December Weather in Heppner, United States

Last updated: June 24, 2025

In December, the average temperature in Heppner, United States hovers around 0°C (33°F), with fluctuations ranging from a chilling -18°C (-1°F) to a milder 17°C (62°F). Expect around 61 mm (2.4 in) of precipitation spread over 13 days, contributing to an average humidity level of 87%. Prepare for a brisk and damp atmosphere!

December Temperature in Heppner

In December in Heppner, the average temperature is 0°C (33°F). Maximum temperatures can reach 17°C (62°F), while minimums can drop to as low as -18°C (-1°F). Be sure to pack layers if you're traveling during this time, as the weather can vary significantly!

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

The chart illustrates December temperature patterns in Heppner, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heppner, December typically has an average temperature of 0°C (33°F), with highs reaching up to 17°C (62°F) and lows dropping to around -18°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec333339465463717161483933
Data source: Temperature data for Heppner 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 Heppner

In Heppner in December, the precipitation amount is 61 mm (2.4 in) occurring over the course of 13 days.

December Precipitation Trends in Heppner

The chart displays monthly precipitation patterns in Heppner, 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 Heppner, December typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec60856969472721027466561
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Heppner

In Heppner in December, humidity is 87%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making every step feel heavier and the air thick and suffocating, often leading to a sense of discomfort while traveling.

December Average Humidity in Heppner

This chart illustrates the average monthly humidity levels in Heppner, 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 Heppner is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%85%83%77%81%77%60%58%75%85%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Heppner

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

Maximum UV Index Levels in Heppner for December

The chart shows the monthly maximum UV Index (UVI) for Heppner 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 Heppner typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Heppner 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 Heppner Compares to Other Months

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

This table compares monthly weather conditions in Heppner, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)60 mm (2.3 inches)86%moderate
February Weather0°C (33°F)85 mm (3.3 inches)86%moderate
March Weather4°C (39°F)69 mm (2.7 inches)85%high
April Weather8°C (46°F)69 mm (2.7 inches)83%very high
May Weather12°C (55°F)47 mm (1.8 inches)77%very high
June Weather17°C (63°F)27 mm (1.1 inches)81%very high
July Weather22°C (72°F)2 mm (0.1 inches)76%very high
August Weather22°C (71°F)10 mm (0.4 inches)60%very high
September Weather16°C (61°F)27 mm (1.1 inches)58%very high
October Weather9°C (48°F)46 mm (1.8 inches)75%moderate
November Weather4°C (39°F)65 mm (2.5 inches)85%moderate
December Weather0°C (33°F)61 mm (2.4 inches)87%low

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