January Weather in Pomona, United States

Last updated: June 24, 2025

In Pomona, United States, the average temperature in January hovers around 2°C (36°F). During this time, temperatures can fluctuate with a minimum of -17°C (1°F) and a maximum of 21°C (70°F). Expect around 84 mm (3.3 in) of precipitation spread across 8 days, accompanied by a high average humidity of 83%.

January Temperature in Pomona

In January in Pomona, the average temperature is 2°C (36°F). Maximums can reach 21°C (70°F) and minimums can be as low as -17°C (1°F). Travelers should be prepared for a wide range of temperatures and dress in layers to accommodate both chilly and warm conditions.

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

The chart illustrates January temperature patterns in Pomona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pomona, January typically has an average temperature of 2°C (36°F), with highs reaching up to 21°C (70°F) and lows dropping to around -17°C (1°F).

Data source: Temperature data for Pomona generated using information from the Copernicus Climate Change Service.

January Precipitation in Pomona

In Pomona in January, the precipitation amount is 84 mm (3.3 in) spread over 8 days.

January Precipitation Trends in Pomona

The chart displays monthly precipitation patterns in Pomona, 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 Pomona, January typically receives around 84 mm (3.3 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Pomona

In Pomona in January, humidity is 83%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket, making travel uncomfortable as the chill seeps into your bones and the moisture clings to your clothing, forcing you to constantly seek warmth and shelter.

January Average Humidity in Pomona

This chart illustrates the average monthly humidity levels in Pomona, 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 Pomona is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Pomona

In Pomona 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 Pomona, you can check the information here.

Maximum UV Index Levels in Pomona for January

The chart shows the monthly maximum UV Index (UVI) for Pomona 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 Pomona typically reaches 3, which falls under the moderate exposure category.

Data source: Pomona 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 Pomona Compares to Other Months

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

This table compares monthly weather conditions in Pomona, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	84 mm (3.3 inches)	83%	moderate
February Weather	4°C (39°F)	113 mm (4.4 inches)	81%	high
March Weather	10°C (50°F)	153 mm (6.0 inches)	80%	high
April Weather	13°C (56°F)	163 mm (6.4 inches)	80%	very high
May Weather	19°C (67°F)	187 mm (7.4 inches)	83%	extreme
June Weather	24°C (75°F)	79 mm (3.1 inches)	83%	extreme
July Weather	26°C (79°F)	77 mm (3.0 inches)	76%	extreme
August Weather	25°C (77°F)	109 mm (4.3 inches)	69%	very high
September Weather	23°C (73°F)	50 mm (2.0 inches)	68%	very high
October Weather	15°C (60°F)	127 mm (5.0 inches)	72%	high
November Weather	8°C (46°F)	76 mm (3.0 inches)	83%	moderate
December Weather	5°C (42°F)	77 mm (3.0 inches)	86%	moderate