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December Weather in South Greeley, United States

Last updated: June 24, 2025

In South Greeley, United States, the average temperature in December hovers around 1°C (33°F). Expect a chilly minimum of -18°C (-1°F), while the mercury can rise to a comfortable 22°C (71°F). During this month, anticipate approximately 15 mm (0.6 in) of precipitation spread over just 3 days, contributing to an average humidity of about 77%.

December Temperature in South Greeley

In December in South Greeley, the average temperature is 1°C (33°F), with maximums reaching 22°C (71°F) and minimums dropping as low as -18°C (-1°F). It's essential to pack accordingly for your trip, as the weather can vary significantly throughout the day.

December Weather in South Greeley: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in South Greeley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Greeley, December typically has an average temperature of 1°C (33°F), with highs reaching up to 22°C (71°F) and lows dropping to around -18°C (-1°F).
JanFebMarAprMayJunJulAugSepOctNovDec302838455366737164464033
Data source: Temperature data for South Greeley 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 South Greeley

In South Greeley in December, the precipitation amount is 15 mm (0.6 in) over the course of 3 days.

December Precipitation Trends in South Greeley

The chart displays monthly precipitation patterns in South Greeley, 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 South Greeley, December typically receives around 15 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec1319514610344343218332315
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Greeley

In South Greeley in December, humidity is 77%. With an average temperature of 1°C (33°F), this humidity feels like an uncomfortable chill that penetrates through layers of clothing, making travel outside feel damp and bone-cold.

December Average Humidity in South Greeley

This chart illustrates the average monthly humidity levels in South Greeley, 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 South Greeley is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%76%62%60%74%82%82%84%75%73%74%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in South Greeley

In South Greeley in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in South Greeley for better planning.

Maximum UV Index Levels in South Greeley for December

The chart shows the monthly maximum UV Index (UVI) for South Greeley 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 South Greeley typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46710101212119644
Data source: South Greeley 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 South Greeley Compares to Other Months

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

This table compares monthly weather conditions in South Greeley, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)13 mm (0.5 inches)72%moderate
February Weather-2°C (28°F)19 mm (0.7 inches)76%high
March Weather3°C (38°F)51 mm (2.0 inches)61%high
April Weather7°C (45°F)46 mm (1.8 inches)60%very high
May Weather12°C (54°F)103 mm (4.1 inches)74%very high
June Weather19°C (67°F)44 mm (1.7 inches)82%extreme
July Weather23°C (73°F)34 mm (1.3 inches)82%extreme
August Weather21°C (71°F)32 mm (1.3 inches)84%extreme
September Weather18°C (64°F)18 mm (0.7 inches)75%very high
October Weather8°C (47°F)33 mm (1.3 inches)73%high
November Weather4°C (40°F)22 mm (0.9 inches)74%moderate
December Weather1°C (33°F)15 mm (0.6 inches)77%moderate

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