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December Weather in Upper Lake, United States

Last updated: June 24, 2025

In December, the average temperature in Upper Lake, United States hovers around 7°C (44°F). Expect a range between a chilly -5°C (23°F) and a mild 22°C (72°F). Rainfall is common, with approximately 110 mm (4.3 in) spread over 10 days, and humidity levels can be quite high at 84%. Be prepared for a mix of weather!

December Temperature in Upper Lake

In December in Upper Lake, the average temperature is 7°C (44°F). Maximums can reach 22°C (72°F) and minimums can be as low as -5°C (23°F). It’s a great time to visit if you enjoy mild weather and the opportunity to experience both cool and pleasantly warm days.

December Weather in Upper Lake: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Upper Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Upper Lake, December typically has an average temperature of 7°C (44°F), with highs reaching up to 22°C (72°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec444547535969767568595044
Data source: Temperature data for Upper Lake 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 Upper Lake

In Upper Lake in December, the precipitation amount is 110 mm (4.3 in) over a period of 10 days.

December Precipitation Trends in Upper Lake

The chart displays monthly precipitation patterns in Upper Lake, 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 Upper Lake, December typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec164167119654740265280110
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Upper Lake

In Upper Lake in December humidity is 84%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making it uncomfortable for traveling and requiring extra layers to stay warm and dry.

December Average Humidity in Upper Lake

This chart illustrates the average monthly humidity levels in Upper Lake, 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 Upper Lake is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%80%80%76%70%66%68%72%84%84%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Upper Lake

In Upper Lake 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 Upper Lake, you can check the information here.

Maximum UV Index Levels in Upper Lake for December

The chart shows the monthly maximum UV Index (UVI) for Upper Lake 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 Upper Lake typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578111111109743
Data source: Upper Lake 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 Upper Lake Compares to Other Months

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

This table compares monthly weather conditions in Upper Lake, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)164 mm (6.5 inches)86%moderate
February Weather7°C (46°F)167 mm (6.6 inches)84%moderate
March Weather8°C (47°F)119 mm (4.7 inches)83%high
April Weather12°C (53°F)65 mm (2.6 inches)80%very high
May Weather15°C (59°F)47 mm (1.9 inches)80%extreme
June Weather20°C (69°F)4 mm (0.1 inches)76%extreme
July Weather24°C (76°F)0 mm (0.0 inches)70%extreme
August Weather24°C (75°F)2 mm (0.1 inches)66%very high
September Weather20°C (69°F)6 mm (0.2 inches)68%very high
October Weather15°C (60°F)52 mm (2.0 inches)72%high
November Weather10°C (50°F)80 mm (3.2 inches)84%moderate
December Weather7°C (44°F)110 mm (4.3 inches)84%moderate

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