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December Weather in South Valley, United States

Last updated: June 24, 2025

In December, the average temperature in South Valley, United States hovers around 3°C (38°F), providing a chilly atmosphere. Expect fluctuations, with minimums plunging to -16°C (3°F) and occasional highs reaching up to 18°C (64°F). Precipitation during this month totals approximately 11 mm (0.4 in), spread over 2 days, while the air carries a noticeable humidity level of 79%.

December Temperature in South Valley

In December in South Valley, the average temperature is 3°C (38°F). The maximum can reach 18°C (64°F) and the minimum can be as low as -16°C (3°F). It's important to pack layers and prepare for a wide range of temperatures while traveling to South Valley during this time.

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

The chart illustrates December temperature patterns in South Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Valley, December typically has an average temperature of 3°C (38°F), with highs reaching up to 18°C (64°F) and lows dropping to around -16°C (3°F).
JanFebMarAprMayJunJulAugSepOctNovDec364150596877797872584737
Data source: Temperature data for South Valley 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 Valley

In South Valley in December, the precipitation amount is 11 mm (0.4 in) over the course of 2 days.

December Precipitation Trends in South Valley

The chart displays monthly precipitation patterns in South Valley, 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 Valley, December typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec16171314810241124251411
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in South Valley

In South Valley in December, humidity is 79%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and urging you to seek shelter indoors to escape the cold, clammy air.

December Average Humidity in South Valley

This chart illustrates the average monthly humidity levels in South Valley, 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 Valley is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%79%66%60%57%55%57%65%72%78%81%79%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in South Valley

In South Valley 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 Valley for better planning.

Maximum UV Index Levels in South Valley for December

The chart shows the monthly maximum UV Index (UVI) for South Valley 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 Valley typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479111213121211854
Data source: South Valley 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 Valley Compares to Other Months

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

This table compares monthly weather conditions in South Valley, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)16 mm (0.6 inches)78%moderate
February Weather5°C (41°F)17 mm (0.7 inches)79%high
March Weather10°C (50°F)13 mm (0.5 inches)66%very high
April Weather15°C (59°F)14 mm (0.6 inches)60%extreme
May Weather20°C (68°F)8 mm (0.3 inches)57%extreme
June Weather25°C (78°F)10 mm (0.4 inches)55%extreme
July Weather26°C (80°F)24 mm (0.9 inches)56%extreme
August Weather26°C (78°F)11 mm (0.4 inches)65%extreme
September Weather22°C (72°F)24 mm (0.9 inches)72%extreme
October Weather14°C (58°F)24 mm (1.0 inches)78%very high
November Weather8°C (47°F)14 mm (0.6 inches)81%moderate
December Weather3°C (38°F)11 mm (0.4 inches)79%moderate

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