January Weather in Monticello, United States

Last updated: June 24, 2025

In Monticello, United States, the average temperature in January hovers around 9°C (48°F). Expect a chill, with minimum temperatures dipping to -9°C (17°F), while the mercury can rise to a pleasant 26°C (79°F). During this month, precipitation is fairly common, amounting to 106 mm (4.2 in) over 8 days, and you'll likely experience a high average humidity of 86%.

January Temperature in Monticello

In January in Monticello, the average temperature is 9°C (48°F). The maximum can reach 26°C (79°F) and the minimum can be as low as -9°C (17°F). Be prepared for a wide range of temperatures if you're planning to travel during this time!

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

The chart illustrates January temperature patterns in Monticello, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monticello, January typically has an average temperature of 9°C (48°F), with highs reaching up to 26°C (79°F) and lows dropping to around -9°C (17°F).

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

January Precipitation in Monticello

In Monticello in January, the precipitation amount is 106 mm (4.2 in) over a span of 8 days.

January Precipitation Trends in Monticello

The chart displays monthly precipitation patterns in Monticello, 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 Monticello, January typically receives around 106 mm (4.2 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 Monticello

In Monticello 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 Monticello

This chart illustrates the average monthly humidity levels in Monticello, 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 Monticello is approximately 86%, 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 Monticello

In Monticello 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 Monticello for better planning.

Maximum UV Index Levels in Monticello for January

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

Data source: Monticello 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 Monticello Compares to Other Months

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

This table compares monthly weather conditions in Monticello, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	106 mm (4.2 inches)	86%	moderate
February Weather	12°C (54°F)	127 mm (5.0 inches)	84%	high
March Weather	15°C (59°F)	88 mm (3.5 inches)	83%	very high
April Weather	18°C (65°F)	103 mm (4.0 inches)	81%	very high
May Weather	23°C (73°F)	95 mm (3.7 inches)	81%	extreme
June Weather	26°C (78°F)	119 mm (4.7 inches)	81%	extreme
July Weather	27°C (81°F)	116 mm (4.6 inches)	83%	extreme
August Weather	27°C (80°F)	123 mm (4.9 inches)	81%	very high
September Weather	25°C (77°F)	103 mm (4.1 inches)	82%	very high
October Weather	20°C (68°F)	107 mm (4.2 inches)	78%	very high
November Weather	13°C (55°F)	79 mm (3.1 inches)	86%	high
December Weather	10°C (51°F)	133 mm (5.2 inches)	89%	moderate