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December Weather in Manteca, United States

Last updated: June 24, 2025

In Manteca, United States, the average temperature in December hovers around 10°C (50°F). Expect chilly nights with minimums dipping to -1°C (30°F), while daytime highs can reach a comfortable 22°C (73°F). Be prepared for some rain, as precipitation averages 78 mm (3.1 in) over 8 days of the month, contributing to a relatively high 80% humidity level.

December Temperature in Manteca

In December in Manteca, the average temperature is 10°C (50°F), with maximums reaching up to 22°C (73°F) and minimums dipping as low as -1°C (30°F). This variability in temperature makes it important for travelers to pack layers to ensure comfort during their stay.

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

The chart illustrates December temperature patterns in Manteca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Manteca, December typically has an average temperature of 10°C (50°F), with highs reaching up to 22°C (73°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec505356636976797873655550
Data source: Temperature data for Manteca 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 Manteca

In Manteca in December, the total precipitation amount is 78 mm (3.1 in) over the course of 8 days.

December Precipitation Trends in Manteca

The chart displays monthly precipitation patterns in Manteca, 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 Manteca, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec92737534161002213378
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Manteca

In Manteca in December, humidity is 80%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill enveloping you, making traveling somewhat uncomfortable as it seeps into your clothes and clings to your skin, leaving you longing for a cozy indoor refuge.

December Average Humidity in Manteca

This chart illustrates the average monthly humidity levels in Manteca, 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 Manteca 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 Manteca

In Manteca 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 Manteca, you can check the information here.

Maximum UV Index Levels in Manteca for December

The chart shows the monthly maximum UV Index (UVI) for Manteca 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 Manteca typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Manteca 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 Manteca Compares to Other Months

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

This table compares monthly weather conditions in Manteca, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)92 mm (3.6 inches)82%moderate
February Weather11°C (53°F)73 mm (2.9 inches)84%moderate
March Weather13°C (56°F)75 mm (3.0 inches)82%very high
April Weather17°C (63°F)34 mm (1.3 inches)78%very high
May Weather20°C (69°F)16 mm (0.6 inches)71%very high
June Weather25°C (76°F)1 mm (0.1 inches)64%extreme
July Weather26°C (79°F)0 mm (0.0 inches)58%extreme
August Weather25°C (78°F)0 mm (0.0 inches)54%very high
September Weather23°C (74°F)2 mm (0.1 inches)55%very high
October Weather18°C (65°F)21 mm (0.8 inches)62%high
November Weather13°C (56°F)33 mm (1.3 inches)78%moderate
December Weather10°C (50°F)78 mm (3.1 inches)80%moderate

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