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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 2°C (36°F), with extremes ranging from a chilly -20°C (-4°F) to a mild 19°C (66°F). Expect about 54 mm (2.1 in) of precipitation over 8 days, accompanied by a high average humidity of 87%.

December Temperature in Monticello

In December in Monticello, the average temperature is 2°C (36°F), with maximums reaching up to 19°C (66°F) and minimums plummeting as low as -20°C (-4°F). Be prepared for a wide range of weather conditions when traveling to Monticello during this month.

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 2°C (36°F), with highs reaching up to 19°C (66°F) and lows dropping to around -20°C (-4°F).
JanFebMarAprMayJunJulAugSepOctNovDec293143526574777470574136
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 total precipitation amount reaches 54 mm (2.1 in) over a span of 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 54 mm (2.1 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec777611812414410592101791197454
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 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
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 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 Monticello, you can check the information here.

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 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098643
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 Weather-2°C (29°F)77 mm (3.0 inches)84%moderate
February Weather0°C (32°F)76 mm (3.0 inches)82%moderate
March Weather6°C (43°F)118 mm (4.7 inches)84%high
April Weather11°C (52°F)124 mm (4.9 inches)83%very high
May Weather18°C (65°F)144 mm (5.7 inches)80%very high
June Weather24°C (75°F)105 mm (4.1 inches)83%extreme
July Weather25°C (78°F)92 mm (3.6 inches)82%very high
August Weather23°C (74°F)101 mm (4.0 inches)82%very high
September Weather21°C (70°F)79 mm (3.1 inches)79%very high
October Weather14°C (57°F)118 mm (4.7 inches)79%high
November Weather5°C (42°F)74 mm (2.9 inches)88%moderate
December Weather2°C (36°F)54 mm (2.1 inches)87%moderate

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