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December Weather in San Joaquin, United States

Last updated: June 24, 2025

In San Joaquin, United States, the average temperature in December hovers around 10°C (51°F). Expect a chill with minimums dropping to -1°C (30°F), while the mercury can rise to a comfortable 25°C (77°F). This month also brings a precipitation amount of 49 mm (1.9 in) spread over 7 days, creating a humid environment with an average humidity of 80%.

December Temperature in San Joaquin

In December in San Joaquin, the average temperature is 10°C (51°F). Maximum temperatures can reach 25°C (77°F), while minimums can dip as low as -1°C (30°F). This varied climate makes San Joaquin an ideal destination for travelers seeking both mild days and cool evenings.

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

The chart illustrates December temperature patterns in San Joaquin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Joaquin, December typically has an average temperature of 10°C (51°F), with highs reaching up to 25°C (77°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec515458667282888679685850
Data source: Temperature data for San Joaquin 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 Joaquin

In San Joaquin in December, the precipitation amount is 49 mm (1.9 in) over the course of 7 days.

December Precipitation Trends in San Joaquin

The chart displays monthly precipitation patterns in San Joaquin, 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 Joaquin, December typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6047652517201192249
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in San Joaquin

In San Joaquin in December, humidity is 80%. With an average temperature of 10°C (51°F), this humidity feels like a damp layer clinging to the skin, making outdoor activities uncomfortable and requiring travelers to dress in layers to cope with the chill and moisture in the air.

December Average Humidity in San Joaquin

This chart illustrates the average monthly humidity levels in San Joaquin, 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 Joaquin is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in San Joaquin

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

Maximum UV Index Levels in San Joaquin for December

The chart shows the monthly maximum UV Index (UVI) for San Joaquin 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 Joaquin typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111211119753
Data source: San Joaquin 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 Joaquin Compares to Other Months

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

This table compares monthly weather conditions in San Joaquin, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (51°F)60 mm (2.4 inches)82%moderate
February Weather12°C (54°F)47 mm (1.9 inches)84%moderate
March Weather14°C (58°F)65 mm (2.5 inches)82%very high
April Weather19°C (66°F)25 mm (1.0 inches)78%very high
May Weather22°C (73°F)17 mm (0.7 inches)71%extreme
June Weather28°C (82°F)2 mm (0.1 inches)64%extreme
July Weather31°C (88°F)0 mm (0.0 inches)58%extreme
August Weather30°C (86°F)1 mm (0.0 inches)54%extreme
September Weather26°C (80°F)1 mm (0.0 inches)55%very high
October Weather20°C (68°F)9 mm (0.4 inches)62%high
November Weather14°C (58°F)22 mm (0.9 inches)78%moderate
December Weather10°C (51°F)49 mm (1.9 inches)80%moderate

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