January Weather in Plano, United States

Last updated: June 24, 2025

In January, the average temperature in Plano, United States hovers around 4°C (39°F), with fluctuations that can see lows of -19°C (-2°F) and highs reaching up to 21°C (70°F). Expect about 97 mm (3.8 in) of precipitation spread across 10 days, contributing to an average humidity of 87%. Prepare for a season that offers a mix of chilly days and occasional warmth!

January Temperature in Plano

In January in Plano, the average temperature is 4°C (39°F). The maximum can reach 21°C (70°F), while the minimum can drop to as low as -19°C (-2°F). It's advisable to pack layers to ensure comfort during your travels.

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

The chart illustrates January temperature patterns in Plano, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Plano, January typically has an average temperature of 4°C (39°F), with highs reaching up to 21°C (70°F) and lows dropping to around -19°C (-2°F).

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

January Precipitation in Plano

In Plano in January, the total precipitation amount is 97 mm (3.8 in) over a span of 10 days.

January Precipitation Trends in Plano

The chart displays monthly precipitation patterns in Plano, 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 Plano, January typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 10 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 Plano

In Plano in January, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

January Average Humidity in Plano

This chart illustrates the average monthly humidity levels in Plano, 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 Plano is approximately 87%, 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 Plano

In Plano 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 Plano, you can check the information here.

Maximum UV Index Levels in Plano for January

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

Data source: Plano 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 Plano Compares to Other Months

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

This table compares monthly weather conditions in Plano, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	97 mm (3.8 inches)	87%	moderate
February Weather	6°C (43°F)	178 mm (7.0 inches)	86%	high
March Weather	10°C (51°F)	139 mm (5.5 inches)	86%	high
April Weather	14°C (58°F)	159 mm (6.3 inches)	82%	very high
May Weather	21°C (70°F)	121 mm (4.8 inches)	82%	very high
June Weather	25°C (76°F)	153 mm (6.0 inches)	83%	extreme
July Weather	27°C (80°F)	121 mm (4.8 inches)	80%	extreme
August Weather	25°C (78°F)	135 mm (5.3 inches)	74%	very high
September Weather	23°C (73°F)	132 mm (5.2 inches)	71%	very high
October Weather	17°C (62°F)	126 mm (5.0 inches)	78%	high
November Weather	8°C (47°F)	87 mm (3.4 inches)	88%	moderate
December Weather	6°C (44°F)	132 mm (5.2 inches)	88%	moderate