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January Weather in Fontana, United States

Last updated: June 24, 2025

In January, the average temperature in Fontana, United States is a chilly -5°C (23°F). Conditions can vary significantly, with minimum temperatures plummeting to -32°C (-25°F) and reaching a maximum of 14°C (57°F). Expect 61 mm (2.4 in) of precipitation over about 8 days, and be prepared for a high average humidity of 85%, creating a brisk and damp atmosphere.

January Temperature in Fontana

In January in Fontana, the average temperature is -5°C (23°F), with maximums reaching 14°C (57°F) and minimums plummeting to -32°C (-25°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates January temperature patterns in Fontana, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fontana, January typically has an average temperature of -5°C (23°F), with highs reaching up to 14°C (57°F) and lows dropping to around -32°C (-25°F).
JanFebMarAprMayJunJulAugSepOctNovDec232537465970757266523731
Data source: Temperature data for Fontana 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 Fontana

In Fontana in January, the precipitation amount is 61 mm (2.4 in) distributed over 8 days.

January Precipitation Trends in Fontana

The chart displays monthly precipitation patterns in Fontana, 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 Fontana, January typically receives around 61 mm (2.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec61586611015411584911041194952
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Fontana

In Fontana in January, humidity is 85%. With an average temperature of -5°C (23°F), this humidity feels like a biting chill that clings to your skin, making even the briefest outdoor excursions feel daunting and uncomfortable.

January Average Humidity in Fontana

This chart illustrates the average monthly humidity levels in Fontana, 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 Fontana is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Fontana

In Fontana 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 Fontana, you can check the information here.

Maximum UV Index Levels in Fontana for January

The chart shows the monthly maximum UV Index (UVI) for Fontana 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 Fontana typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Fontana 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 Fontana Compares to Other Months

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

This table compares monthly weather conditions in Fontana, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)61 mm (2.4 inches)85%moderate
February Weather-4°C (25°F)58 mm (2.3 inches)85%moderate
March Weather3°C (37°F)66 mm (2.6 inches)85%high
April Weather8°C (47°F)110 mm (4.3 inches)85%very high
May Weather15°C (60°F)154 mm (6.0 inches)78%very high
June Weather21°C (71°F)115 mm (4.5 inches)80%very high
July Weather24°C (75°F)84 mm (3.3 inches)78%very high
August Weather22°C (72°F)91 mm (3.6 inches)76%very high
September Weather19°C (66°F)104 mm (4.1 inches)79%very high
October Weather11°C (53°F)119 mm (4.7 inches)83%moderate
November Weather3°C (37°F)49 mm (1.9 inches)88%moderate
December Weather-1°C (31°F)52 mm (2.1 inches)81%low

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