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December Weather in Tracy, United States

Last updated: June 24, 2025

In December, the average temperature in Tracy, United States hovers around 9°C (49°F), with a minimum dipping as low as -2°C (29°F) and a maximum reaching up to 22°C (71°F). Expect 78 mm (3.1 in) of precipitation over 9 days, coupled with a high average humidity of 80%. Prepare accordingly for this mix of cool temperatures and moist conditions!

December Temperature in Tracy

In December in Tracy, the average temperature is 9°C (49°F). Maximums can reach 22°C (71°F) and minimums can be as low as -2°C (29°F). Travelers should be prepared for a range of temperatures and pack accordingly to enjoy their visit to Tracy.

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

The chart illustrates December temperature patterns in Tracy, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Tracy, December typically has an average temperature of 9°C (49°F), with highs reaching up to 22°C (71°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec495254606572757571645549
Data source: Temperature data for Tracy 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 Tracy

In Tracy in December, the precipitation amount is 78 mm (3.1 in) over the course of 9 days.

December Precipitation Trends in Tracy

The chart displays monthly precipitation patterns in Tracy, 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 Tracy, December typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec92767531161002223378
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Tracy

In Tracy in December, humidity is 80%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and prompting a need for layered clothing to stay comfortable while traveling.

December Average Humidity in Tracy

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

In Tracy 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 Tracy, you can check the information here.

Maximum UV Index Levels in Tracy for December

The chart shows the monthly maximum UV Index (UVI) for Tracy 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 Tracy typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589111111109753
Data source: Tracy 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 Tracy Compares to Other Months

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

This table compares monthly weather conditions in Tracy, 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 (52°F)76 mm (3.0 inches)84%moderate
March Weather12°C (55°F)75 mm (2.9 inches)82%very high
April Weather16°C (60°F)31 mm (1.2 inches)78%very high
May Weather19°C (66°F)16 mm (0.6 inches)71%extreme
June Weather22°C (73°F)1 mm (0.0 inches)64%extreme
July Weather24°C (75°F)0 mm (0.0 inches)58%extreme
August Weather24°C (75°F)0 mm (0.0 inches)54%very high
September Weather22°C (71°F)2 mm (0.1 inches)55%very high
October Weather18°C (64°F)22 mm (0.9 inches)62%high
November Weather13°C (55°F)33 mm (1.3 inches)78%moderate
December Weather9°C (49°F)78 mm (3.1 inches)80%moderate

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