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December Weather in Monticello, United States

Last updated: June 24, 2025

In December, the average temperature in Monticello, United States hovers around 14°C (57°F). Temperature fluctuations can be quite dramatic, with minima dipping to -3°C (26°F) and maxima reaching 27°C (80°F). Expect around 111 mm (4.4 in) of precipitation spread over 8 days, contributing to an average humidity of a high 88%.

December Temperature in Monticello

In December in Monticello, the average temperature is 14°C (57°F), with maximums reaching 27°C (80°F) and minimums dropping to as low as -3°C (26°F). This diverse temperature range suggests a need for versatile clothing when traveling, allowing you to enjoy both warm days and cooler evenings.

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 14°C (57°F), with highs reaching up to 27°C (80°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec546063687580818179736156
Data source: Temperature data for Monticello generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Monticello

In Monticello in December, the precipitation amount is 111 mm (4.4 in) spread over 8 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 111 mm (4.4 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec70914887831721811561127753111
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Monticello

In Monticello in December humidity is 88%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making every step feel heavier and giving a sense of stickiness that can drain your energy quickly 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.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec589101111121110864
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.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)70 mm (2.8 inches)85%moderate
February Weather15°C (60°F)91 mm (3.6 inches)82%very high
March Weather17°C (64°F)48 mm (1.9 inches)80%very high
April Weather20°C (68°F)87 mm (3.4 inches)76%very high
May Weather24°C (76°F)83 mm (3.3 inches)73%extreme
June Weather26°C (80°F)172 mm (6.8 inches)74%extreme
July Weather27°C (81°F)181 mm (7.1 inches)80%extreme
August Weather27°C (81°F)156 mm (6.1 inches)79%extreme
September Weather26°C (80°F)112 mm (4.4 inches)83%very high
October Weather23°C (74°F)77 mm (3.0 inches)77%very high
November Weather16°C (61°F)53 mm (2.1 inches)84%high
December Weather14°C (57°F)111 mm (4.4 inches)88%moderate

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