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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 4°C (39°F), with a potential chill dipping to -9°C (15°F) and a mild peak reaching up to 20°C (68°F). Expect about 19 mm (0.7 in) of precipitation over approximately 4 days, accompanied by an average humidity level of 78%.

December Temperature in Alamo

In December in Alamo, the average temperature is 4°C (39°F). The maximum can reach 20°C (68°F), while the minimum can be as low as -9°C (15°F). This variability in temperature suggests that travelers should prepare for both mild and chilly conditions during their visit.

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 4°C (39°F), with highs reaching up to 20°C (68°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec394250606881868476605039
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 19 mm (0.7 in) over the course of 4 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 19 mm (0.7 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec24243510121154381119
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 78%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration somewhat uncomfortable and necessitating the need for warm, weatherproof clothing to fully enjoy your travels.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%84%76%64%48%40%33%29%43%61%76%78%
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 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 Alamo, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
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 Weather4°C (39°F)24 mm (0.9 inches)81%moderate
February Weather6°C (42°F)24 mm (0.9 inches)84%high
March Weather10°C (50°F)35 mm (1.4 inches)76%very high
April Weather16°C (60°F)10 mm (0.4 inches)64%very high
May Weather20°C (68°F)12 mm (0.5 inches)48%extreme
June Weather27°C (81°F)1 mm (0.0 inches)40%extreme
July Weather30°C (86°F)15 mm (0.6 inches)33%extreme
August Weather29°C (85°F)4 mm (0.1 inches)29%extreme
September Weather24°C (76°F)3 mm (0.1 inches)43%very high
October Weather15°C (60°F)8 mm (0.3 inches)61%high
November Weather10°C (50°F)11 mm (0.4 inches)76%moderate
December Weather4°C (39°F)19 mm (0.7 inches)78%moderate

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