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December Weather in Pleasanton, United States

Last updated: June 24, 2025

In Pleasanton, United States, the average temperature in December hovers around 4°C (40°F), with minimums dipping as low as -16°C (4°F) and maximums soaring to 23°C (74°F). Expect about 33 mm (1.3 in) of precipitation spread over 4 days, contributing to the high average humidity of 86%.

December Temperature in Pleasanton

In December in Pleasanton, the average temperature is 4°C (40°F). Maximum temperatures can reach 23°C (74°F), while minimum temperatures can drop as low as -16°C (4°F). This wide temperature range suggests that travelers should be well-prepared for both chilly and warm conditions when visiting.

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

The chart illustrates December temperature patterns in Pleasanton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pleasanton, December typically has an average temperature of 4°C (40°F), with highs reaching up to 23°C (74°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec333548556777807773584639
Data source: Temperature data for Pleasanton 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 Pleasanton

In Pleasanton in December, the precipitation amount is 33 mm (1.3 in) over a span of 4 days.

December Precipitation Trends in Pleasanton

The chart displays monthly precipitation patterns in Pleasanton, 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 Pleasanton, December typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec634910711118793129121771064733
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Pleasanton

In Pleasanton in December humidity is 86%. With an average temperature of 4°C (40°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel cumbersome as you navigate through a thick, heavy air that clings to your skin.

December Average Humidity in Pleasanton

This chart illustrates the average monthly humidity levels in Pleasanton, 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 Pleasanton is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Pleasanton

In Pleasanton 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 Pleasanton, you can check the information here.

Maximum UV Index Levels in Pleasanton for December

The chart shows the monthly maximum UV Index (UVI) for Pleasanton 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 Pleasanton typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109743
Data source: Pleasanton 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 Pleasanton Compares to Other Months

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

This table compares monthly weather conditions in Pleasanton, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)63 mm (2.5 inches)80%moderate
February Weather2°C (35°F)49 mm (1.9 inches)78%moderate
March Weather9°C (48°F)107 mm (4.2 inches)75%high
April Weather13°C (56°F)111 mm (4.4 inches)77%very high
May Weather19°C (67°F)186 mm (7.3 inches)82%very high
June Weather25°C (78°F)93 mm (3.6 inches)83%extreme
July Weather27°C (81°F)129 mm (5.1 inches)81%extreme
August Weather25°C (77°F)120 mm (4.7 inches)78%very high
September Weather23°C (73°F)77 mm (3.0 inches)72%very high
October Weather15°C (58°F)106 mm (4.2 inches)72%high
November Weather8°C (46°F)47 mm (1.9 inches)84%moderate
December Weather4°C (40°F)33 mm (1.3 inches)86%moderate

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