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December Weather in Alamo, United States

Last updated: June 24, 2025

In December, the average temperature in Alamo, United States hovers around 2°C (36°F). However, temperatures can swing dramatically, with a minimum of -19°C (-3°F) and a maximum reaching 19°C (66°F). Expect a moderate amount of precipitation, measuring around 12 mm (0.5 in) over approximately 3 days, while the average humidity lingers at a notable 82%.

December Temperature in Alamo

In December in Alamo, the average temperature is 2°C (36°F). Maximum temperatures can reach up to 19°C (66°F), while minimums can drop as low as -19°C (-3°F). Travelers should be prepared for a wide range of temperatures, layering clothing for both warm days and cold nights.

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

The chart illustrates December temperature patterns in Alamo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alamo, December typically has an average temperature of 2°C (36°F), with highs reaching up to 19°C (66°F) and lows dropping to around -19°C (-3°F).
JanFebMarAprMayJunJulAugSepOctNovDec353947556474757368564636
Data source: Temperature data for Alamo 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 Alamo

In Alamo in December, the precipitation amount is 12 mm (0.5 in) during a span of 3 days.

December Precipitation Trends in Alamo

The chart displays monthly precipitation patterns in Alamo, 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 Alamo, December typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec181619121119473332191212
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Alamo

In Alamo in December humidity is 82%. With an average temperature of 2°C (36°F), this humidity feels like a damp chill that clings to your skin, making even brief outings feel uncomfortable and penetrating.

December Average Humidity in Alamo

This chart illustrates the average monthly humidity levels in Alamo, 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 Alamo is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%83%71%61%48%36%37%46%62%74%82%82%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Alamo

In Alamo in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Alamo for better planning.

Maximum UV Index Levels in Alamo for December

The chart shows the monthly maximum UV Index (UVI) for Alamo 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 Alamo typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710121313131211864
Data source: Alamo 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 Alamo Compares to Other Months

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

This table compares monthly weather conditions in Alamo, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)18 mm (0.7 inches)81%moderate
February Weather4°C (39°F)16 mm (0.6 inches)83%high
March Weather8°C (47°F)19 mm (0.8 inches)71%very high
April Weather13°C (56°F)12 mm (0.5 inches)61%extreme
May Weather18°C (64°F)11 mm (0.4 inches)48%extreme
June Weather23°C (74°F)19 mm (0.7 inches)36%extreme
July Weather24°C (75°F)47 mm (1.8 inches)37%extreme
August Weather23°C (74°F)33 mm (1.3 inches)46%extreme
September Weather20°C (68°F)32 mm (1.3 inches)62%extreme
October Weather13°C (56°F)19 mm (0.8 inches)74%very high
November Weather8°C (46°F)12 mm (0.5 inches)82%high
December Weather2°C (36°F)12 mm (0.5 inches)82%moderate

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