December Weather in Monticello, United States

Last updated: June 24, 2025

In December, the average temperature in Monticello, United States hovers around 12°C (53°F). During this time, temperatures can dip as low as -6°C (21°F) or soar to a maximum of 27°C (82°F). Expect 141 mm (5.6 in) of precipitation over approximately 12 days, coupled with a high average humidity of 88%. Whether you prefer a chilly ambiance or warmer days, December offers a mix of weather challenges and cozy comforts.

December Temperature in Monticello

In December in Monticello, the average temperature is 12°C (53°F), with maximums reaching 27°C (82°F) and minimums dropping as low as -6°C (21°F). It's a time of diverse weather, so packing layers will ensure you're prepared for whatever conditions you may encounter during your travels.

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

The chart illustrates December 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, December typically has an average temperature of 12°C (53°F), with highs reaching up to 27°C (82°F) and lows dropping to around -6°C (21°F).

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

December Precipitation in Monticello

In Monticello in December, the total precipitation amount is 141 mm (5.6 in) spread over 12 days.

December Precipitation Trends in Monticello

The chart displays monthly precipitation patterns in Monticello, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Monticello, December typically receives around 141 mm (5.6 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

December Humidity in Monticello

In Monticello in December humidity is 88%. With an average temperature of 12°C (53°F), this humidity feels like a damp chill that clings to your skin, making it crucial to dress in layers and stay prepared for the discomfort while exploring.

December Average Humidity in Monticello

This chart illustrates the average monthly humidity levels in Monticello, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Monticello is approximately 88%, offering insight into how humid the weather typically is during this month.

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

December UV Index in Monticello

In Monticello in December, 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 December

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

Data source: Monticello December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	116 mm (4.6 inches)	83%	moderate
February Weather	13°C (56°F)	118 mm (4.6 inches)	83%	high
March Weather	16°C (62°F)	117 mm (4.6 inches)	80%	very high
April Weather	19°C (66°F)	143 mm (5.6 inches)	81%	extreme
May Weather	23°C (74°F)	160 mm (6.3 inches)	81%	extreme
June Weather	26°C (79°F)	158 mm (6.2 inches)	78%	extreme
July Weather	27°C (81°F)	133 mm (5.2 inches)	79%	extreme
August Weather	27°C (81°F)	170 mm (6.7 inches)	79%	extreme
September Weather	26°C (79°F)	114 mm (4.5 inches)	79%	very high
October Weather	21°C (70°F)	98 mm (3.9 inches)	77%	very high
November Weather	14°C (57°F)	83 mm (3.3 inches)	85%	high
December Weather	12°C (53°F)	141 mm (5.6 inches)	88%	moderate