January Weather in Monticello, United States

Last updated: June 24, 2025

In Monticello, United States, the average temperature in January hovers around -9°C (16°F). Expect chilly extremes, with minimums plummeting to -34°C (-29°F) and maximums peaking at 6°C (44°F). During this time, precipitation can reach 21 mm (0.8 in) over approximately 4 days, with an average humidity of 87%, making it a particularly crisp and damp month.

January Temperature in Monticello

In January in Monticello, the average temperature is -9°C (16°F). The maximum can reach 6°C (44°F), while the minimum can dip to a chilling -34°C (-29°F). Travelers should prepare for extremely cold conditions and dress accordingly to ensure comfort during their visit.

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 (16°F), with highs reaching up to 6°C (44°F) and lows dropping to around -34°C (-29°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 21 mm (0.8 in) over a span of 4 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 21 mm (0.8 inches) of precipitation spread over approximately 4 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 87%. With an average temperature of -9°C (16°F), this humidity feels like a heavy blanket of moisture that clings to your skin, making it uncomfortable for traveling and causing your breath to mist in the cold air while navigating the wintry landscape.

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 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 Monticello

In Monticello in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Monticello, you can visit Hourly UV Index in Monticello.

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 2, which falls under the low 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 (16°F)	21 mm (0.8 inches)	87%	low
February Weather	-9°C (16°F)	28 mm (1.1 inches)	90%	moderate
March Weather	0°C (32°F)	53 mm (2.1 inches)	85%	moderate
April Weather	6°C (43°F)	88 mm (3.5 inches)	84%	high
May Weather	15°C (59°F)	106 mm (4.2 inches)	78%	very high
June Weather	22°C (72°F)	77 mm (3.0 inches)	80%	very high
July Weather	23°C (74°F)	93 mm (3.6 inches)	81%	very high
August Weather	21°C (71°F)	150 mm (5.9 inches)	81%	very high
September Weather	17°C (64°F)	112 mm (4.4 inches)	81%	high
October Weather	9°C (48°F)	102 mm (4.0 inches)	84%	moderate
November Weather	0°C (33°F)	33 mm (1.3 inches)	88%	moderate
December Weather	-5°C (23°F)	45 mm (1.8 inches)	84%	low