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December Weather in Santo Tomas, Mexico

Last updated: August 27, 2025

In December, the average temperature in Santo Tomas, Mexico hovers around 6°C (44°F). Temperatures can vary significantly, with a minimum of -7°C (20°F) and a maximum of 21°C (70°F). Expect around 16 mm (0.6 in) of precipitation over 3 days, while the average humidity remains high at 85%.

December Temperature in Santo Tomas

In December in Santo Tomas, the average temperature is 6°C (44°F). The maximum can reach 21°C (70°F), while the minimum can drop as low as -7°C (20°F). Travelers should be prepared for a range of temperatures during this month.

December Weather in Santo Tomas: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Santo Tomas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Santo Tomas, December typically has an average temperature of 6°C (44°F), with highs reaching up to 21°C (70°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec434652596571676663595143
Data source: Temperature data for Santo Tomas 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 Santo Tomas

In Santo Tomas in December, the precipitation amount is 16 mm (0.6 in), spread over a duration of 3 days.

December Precipitation Trends in Santo Tomas

The chart displays monthly precipitation patterns in Santo Tomas, 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 Santo Tomas, December typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec131516363019015176302116
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Santo Tomas

In Santo Tomas in December, humidity is 85%. With an average temperature of 6°C (44°F), this humidity feels like a chilly dampness that seeps into your clothes, making travel uncomfortable and adding an extra layer of chill to the air.

December Average Humidity in Santo Tomas

This chart illustrates the average monthly humidity levels in Santo Tomas, 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 Santo Tomas is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%69%63%50%39%36%60%78%82%76%80%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Santo Tomas

In Santo Tomas in December, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Santo Tomas, you can refer to this Hourly UV Index in Santo Tomas.

Maximum UV Index Levels in Santo Tomas for December

The chart shows the monthly maximum UV Index (UVI) for Santo Tomas 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 Santo Tomas typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69111313141313121086
Data source: Santo Tomas 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 Santo Tomas Compares to Other Months

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

This table compares monthly weather conditions in Santo Tomas, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)13 mm (0.5 inches)78%high
February Weather8°C (46°F)15 mm (0.6 inches)69%very high
March Weather11°C (52°F)16 mm (0.6 inches)63%extreme
April Weather15°C (59°F)2 mm (0.1 inches)49%extreme
May Weather18°C (65°F)6 mm (0.2 inches)39%extreme
June Weather22°C (71°F)30 mm (1.2 inches)36%extreme
July Weather19°C (67°F)190 mm (7.5 inches)60%extreme
August Weather19°C (66°F)151 mm (5.9 inches)78%extreme
September Weather17°C (63°F)76 mm (3.0 inches)82%extreme
October Weather15°C (59°F)30 mm (1.2 inches)76%very high
November Weather11°C (51°F)21 mm (0.8 inches)80%very high
December Weather6°C (44°F)16 mm (0.6 inches)85%high

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