nomadseason

December Weather in Tracy, United States

Last updated: June 24, 2025

In Tracy, United States, the average temperature in December hovers around -4°C (25°F). During this time, temperatures can drop as low as -25°C (-12°F), with the mercury occasionally rising to a maximum of 15°C (60°F). Expect about 41 mm (1.6 in) of precipitation spread over roughly 4 days, contributing to an average humidity level of 84%.

December Temperature in Tracy

In December in Tracy, the average temperature is -4°C (25°F), with maximums reaching 15°C (60°F) and minimums plunging to as low as -25°C (-12°F). Be prepared for extreme temperature variations, making layering essential for your travels.

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 -4°C (25°F), with highs reaching up to 15°C (60°F) and lows dropping to around -25°C (-12°F).
JanFebMarAprMayJunJulAugSepOctNovDec171733435972747064483425
Data source: Temperature data for Tracy generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
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 41 mm (1.6 in) over the course of 4 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 41 mm (1.6 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec27276583122104118128107923041
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Tracy

In Tracy in December, humidity is 84%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%89%81%82%76%81%82%83%82%82%87%84%
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 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Tracy, you can visit Hourly UV Index in Tracy.

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 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3558910998532
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 Weather-8°C (17°F)27 mm (1.0 inches)85%moderate
February Weather-9°C (17°F)27 mm (1.1 inches)89%moderate
March Weather1°C (33°F)65 mm (2.6 inches)81%moderate
April Weather6°C (43°F)83 mm (3.3 inches)82%very high
May Weather15°C (59°F)122 mm (4.8 inches)76%very high
June Weather22°C (72°F)104 mm (4.1 inches)81%very high
July Weather23°C (74°F)118 mm (4.6 inches)82%very high
August Weather21°C (71°F)128 mm (5.1 inches)83%very high
September Weather18°C (65°F)107 mm (4.2 inches)82%very high
October Weather9°C (48°F)92 mm (3.6 inches)82%moderate
November Weather1°C (34°F)30 mm (1.2 inches)87%moderate
December Weather-4°C (25°F)41 mm (1.6 inches)84%low

Compare Tracy's Climate with Cities Worldwide