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December Weather in San Ardo, United States

Last updated: June 24, 2025

In December, the average temperature in San Ardo, United States hovers around 10°C (50°F). However, don’t be surprised by the range — temperatures can dip as low as -3°C (28°F) or climb to a balmy 26°C (78°F). Expect a fair amount of rain, with 62 mm (2.5 in) falling over approximately 6 days. With an average humidity of 76%, it’s wise to pack accordingly for this dynamic climate!

December Temperature in San Ardo

In December in San Ardo, the average temperature is 10°C (50°F), with maximums reaching 26°C (78°F) and minimums dropping as low as -3°C (28°F). This variation means travelers should be prepared for both warm days and chilly nights during their stay.

December Weather in San Ardo: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in San Ardo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Ardo, December typically has an average temperature of 10°C (50°F), with highs reaching up to 26°C (78°F) and lows dropping to around -3°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec505153596471757572655650
Data source: Temperature data for San Ardo 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 San Ardo

In San Ardo in December, the precipitation amount is 62 mm (2.5 in) over the course of 6 days.

December Precipitation Trends in San Ardo

The chart displays monthly precipitation patterns in San Ardo, 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 San Ardo, December typically receives around 62 mm (2.5 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec9869762110000182462
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Ardo

In San Ardo in December, humidity is 76%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps through your clothes, making outdoor activities quite uncomfortable and necessitating a layer of warmth for traveling.

December Average Humidity in San Ardo

This chart illustrates the average monthly humidity levels in San Ardo, 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 San Ardo is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%80%76%75%74%75%72%70%70%74%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Ardo

In San Ardo 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 San Ardo, you can check the information here.

Maximum UV Index Levels in San Ardo for December

The chart shows the monthly maximum UV Index (UVI) for San Ardo 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 San Ardo typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111212119753
Data source: San Ardo 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 San Ardo Compares to Other Months

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

This table compares monthly weather conditions in San Ardo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)98 mm (3.9 inches)80%moderate
February Weather10°C (51°F)69 mm (2.7 inches)83%moderate
March Weather12°C (54°F)76 mm (3.0 inches)80%very high
April Weather15°C (60°F)21 mm (0.8 inches)76%very high
May Weather18°C (64°F)9 mm (0.4 inches)75%extreme
June Weather22°C (71°F)0 mm (0.0 inches)74%extreme
July Weather24°C (75°F)0 mm (0.0 inches)75%extreme
August Weather24°C (75°F)0 mm (0.0 inches)72%extreme
September Weather22°C (72°F)1 mm (0.0 inches)70%very high
October Weather18°C (65°F)8 mm (0.3 inches)70%high
November Weather13°C (56°F)24 mm (0.9 inches)74%moderate
December Weather10°C (50°F)62 mm (2.5 inches)76%moderate

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