January Weather in Thornton, United States

Last updated: June 24, 2025

In January, the average temperature in Thornton, United States is a cool 10°C (50°F). Be prepared for a temperature range that can drop as low as -10°C (14°F) or rise to a warm 27°C (81°F). During this time, expect about 78 mm (3.1 in) of precipitation spread over 7 days, accompanied by a relatively high average humidity of 79%.

January Temperature in Thornton

In January in Thornton, the average temperature is 10°C (50°F). Maximums can reach 27°C (81°F), while minimums can drop as low as -10°C (14°F). Be prepared for a wide range of temperatures and pack accordingly for your travels!

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

The chart illustrates January temperature patterns in Thornton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thornton, January typically has an average temperature of 10°C (50°F), with highs reaching up to 27°C (81°F) and lows dropping to around -10°C (14°F).

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

January Precipitation in Thornton

In Thornton in January, the total precipitation amount is 78 mm (3.1 in) over a duration of 7 days.

January Precipitation Trends in Thornton

The chart displays monthly precipitation patterns in Thornton, 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 Thornton, January typically receives around 78 mm (3.1 inches) of precipitation spread over approximately 7 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 Thornton

In Thornton in January humidity is 79%. With an average temperature of 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration less inviting and requiring layered clothing to stay comfortable while traveling.

January Average Humidity in Thornton

This chart illustrates the average monthly humidity levels in Thornton, 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 Thornton is approximately 79%, 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 Thornton

In Thornton in January, 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 Thornton for better planning.

Maximum UV Index Levels in Thornton for January

The chart shows the monthly maximum UV Index (UVI) for Thornton 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 Thornton typically reaches 4, which falls under the moderate exposure category.

Data source: Thornton 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 Thornton Compares to Other Months

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

This table compares monthly weather conditions in Thornton, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	78 mm (3.1 inches)	79%	moderate
February Weather	11°C (52°F)	102 mm (4.0 inches)	80%	high
March Weather	17°C (63°F)	97 mm (3.8 inches)	78%	very high
April Weather	19°C (67°F)	116 mm (4.6 inches)	79%	extreme
May Weather	24°C (76°F)	168 mm (6.6 inches)	81%	extreme
June Weather	28°C (82°F)	75 mm (3.0 inches)	77%	extreme
July Weather	30°C (86°F)	59 mm (2.3 inches)	71%	extreme
August Weather	30°C (87°F)	84 mm (3.3 inches)	67%	extreme
September Weather	27°C (81°F)	98 mm (3.9 inches)	69%	very high
October Weather	21°C (71°F)	109 mm (4.3 inches)	73%	very high
November Weather	15°C (59°F)	67 mm (2.6 inches)	82%	high
December Weather	12°C (54°F)	91 mm (3.6 inches)	87%	moderate