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December Weather in Harper, United States

Last updated: June 24, 2025

In Harper, United States, the average temperature in December hovers around 4°C (40°F), with a minimum plunge down to -13°C (9°F) and a maximum rise up to 26°C (78°F). Expect about 31 mm (1.2 in) of precipitation over 3 days, accompanied by a high average humidity of 83%. Stay prepared for a damp and chilly experience!

December Temperature in Harper

In December in Harper, the average temperature is 4°C (40°F), with maximums reaching 26°C (78°F) and minimums dropping as low as -13°C (9°F). Travelers should be prepared for a wide range of temperatures during this time.

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

The chart illustrates December temperature patterns in Harper, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harper, December typically has an average temperature of 4°C (40°F), with highs reaching up to 26°C (78°F) and lows dropping to around -13°C (9°F).
JanFebMarAprMayJunJulAugSepOctNovDec343649576779827974594639
Data source: Temperature data for Harper 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 Harper

In Harper in December, the precipitation amount is 31 mm (1.2 in) over the course of 3 days.

December Precipitation Trends in Harper

The chart displays monthly precipitation patterns in Harper, 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 Harper, December typically receives around 31 mm (1.2 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec322776681581155470631002331
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Harper

In Harper in December humidity is 83%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring you to bundle up while bracing against the heavy, cold air.

December Average Humidity in Harper

This chart illustrates the average monthly humidity levels in Harper, 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 Harper is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Harper

In Harper 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 Harper, you can check the information here.

Maximum UV Index Levels in Harper for December

The chart shows the monthly maximum UV Index (UVI) for Harper 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 Harper typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Harper 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 Harper Compares to Other Months

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

This table compares monthly weather conditions in Harper, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)32 mm (1.2 inches)75%moderate
February Weather2°C (36°F)27 mm (1.1 inches)76%high
March Weather10°C (50°F)76 mm (3.0 inches)67%high
April Weather14°C (57°F)68 mm (2.7 inches)70%very high
May Weather20°C (68°F)157 mm (6.2 inches)82%very high
June Weather26°C (79°F)115 mm (4.5 inches)82%extreme
July Weather28°C (82°F)54 mm (2.1 inches)81%extreme
August Weather26°C (79°F)70 mm (2.8 inches)76%very high
September Weather23°C (74°F)63 mm (2.5 inches)67%very high
October Weather15°C (59°F)100 mm (3.9 inches)72%high
November Weather8°C (47°F)22 mm (0.9 inches)80%moderate
December Weather4°C (40°F)31 mm (1.2 inches)83%moderate

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