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December Weather in Folsom, United States

Last updated: June 24, 2025

In Folsom, United States, the average temperature in December hovers around 13°C (55°F), with a minimum reaching as low as -3°C (26°F) and a maximum peaking at 28°C (83°F). Expect 135 mm (5.3 in) of precipitation spread over 12 days, contributing to a notably high average humidity of 88%.

December Temperature in Folsom

In December in Folsom, the average temperature is 13°C (55°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -3°C (26°F). This unpredictable weather makes it essential for travelers to pack for both warm and cool conditions.

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

The chart illustrates December temperature patterns in Folsom, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Folsom, December typically has an average temperature of 13°C (55°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec525763677579818178715855
Data source: Temperature data for Folsom 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 Folsom

In Folsom in December, the precipitation amount is 135 mm (5.3 in), occurring over the course of 12 days.

December Precipitation Trends in Folsom

The chart displays monthly precipitation patterns in Folsom, 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 Folsom, December typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec1221259315116217618123514011881135
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Folsom

In Folsom in December humidity is 88%. With an average temperature of 13°C (55°F), this humidity feels like a damp chill that clings to your skin, making it essential to dress in layers while exploring, as the moisture in the air can lead to a rather uncomfortable experience for traveling.

December Average Humidity in Folsom

This chart illustrates the average monthly humidity levels in Folsom, 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 Folsom is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%83%80%81%81%78%79%79%79%77%85%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Folsom

In Folsom 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 Folsom for better planning.

Maximum UV Index Levels in Folsom for December

The chart shows the monthly maximum UV Index (UVI) for Folsom 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 Folsom typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112111110864
Data source: Folsom 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 Folsom Compares to Other Months

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

This table compares monthly weather conditions in Folsom, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)122 mm (4.8 inches)83%moderate
February Weather14°C (58°F)125 mm (4.9 inches)83%very high
March Weather17°C (63°F)93 mm (3.7 inches)80%very high
April Weather19°C (67°F)151 mm (5.9 inches)81%extreme
May Weather24°C (75°F)162 mm (6.4 inches)81%extreme
June Weather26°C (80°F)176 mm (6.9 inches)78%extreme
July Weather27°C (81°F)181 mm (7.1 inches)79%extreme
August Weather27°C (81°F)235 mm (9.3 inches)79%extreme
September Weather26°C (79°F)140 mm (5.5 inches)79%very high
October Weather22°C (71°F)118 mm (4.7 inches)77%very high
November Weather15°C (59°F)81 mm (3.2 inches)85%high
December Weather13°C (55°F)135 mm (5.3 inches)88%moderate

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