January Weather in Geyserville, United States

Last updated: June 24, 2025

In January, the average temperature in Geyserville, United States hovers around 9°C (48°F). Expect chilly minimums of -2°C (29°F), with maximums reaching a pleasant 24°C (76°F). During this month, 161 mm (6.3 in) of precipitation is likely over 9 days, contributing to a high average humidity of 86%. Whether you're braving the cool air or enjoying the warm afternoons, be prepared for a mix of weather!

January Temperature in Geyserville

In January in Geyserville, the average temperature is 9°C (48°F). The maximum can reach 24°C (76°F) and the minimum can be as low as -2°C (29°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both warm and cool conditions.

January Weather in Geyserville: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Geyserville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Geyserville, January typically has an average temperature of 9°C (48°F), with highs reaching up to 24°C (76°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec474950566169737369625247
Data source: Temperature data for Geyserville 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.

January Precipitation in Geyserville

In Geyserville in January, the precipitation amount is 161 mm (6.3 in) spread over 9 days.

January Precipitation Trends in Geyserville

The chart displays monthly precipitation patterns in Geyserville, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Geyserville, January typically receives around 161 mm (6.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec161176117553720025071108
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Geyserville

In Geyserville in January, humidity is 86%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that wraps around you, making outdoor activities uncomfortable and travel less enjoyable.

January Average Humidity in Geyserville

This chart illustrates the average monthly humidity levels in Geyserville, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Geyserville is approximately 86%, 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 January generated using information from the Copernicus Climate Change Service.

January UV Index in Geyserville

In Geyserville in January, 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 Geyserville, you can check the information here.

Maximum UV Index Levels in Geyserville for January

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

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

This table compares monthly weather conditions in Geyserville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)161 mm (6.3 inches)86%moderate
February Weather9°C (49°F)176 mm (6.9 inches)84%moderate
March Weather10°C (51°F)117 mm (4.6 inches)83%high
April Weather13°C (56°F)55 mm (2.2 inches)80%very high
May Weather16°C (61°F)37 mm (1.5 inches)80%extreme
June Weather21°C (69°F)2 mm (0.1 inches)76%extreme
July Weather23°C (73°F)0 mm (0.0 inches)70%extreme
August Weather23°C (73°F)0 mm (0.0 inches)66%very high
September Weather21°C (69°F)2 mm (0.1 inches)68%very high
October Weather17°C (62°F)50 mm (2.0 inches)72%high
November Weather11°C (53°F)71 mm (2.8 inches)84%moderate
December Weather8°C (47°F)108 mm (4.3 inches)84%moderate

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