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December Weather in Monticello, United States

Last updated: June 24, 2025

In Monticello, United States, the average temperature in December hovers around 10°C (50°F), with a range that can dip as low as -6°C (22°F) and soar up to 26°C (80°F). Expect 142 mm (5.6 in) of precipitation spread over 11 days, resulting in a notably high average humidity of 88%. Stay prepared for a mix of mild temperatures and moisture!

December Temperature in Monticello

In December in Monticello, the average temperature is 10°C (50°F). The maximum can reach 26°C (80°F), while the minimum can drop to as low as -6°C (22°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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 10°C (50°F), with highs reaching up to 26°C (80°F) and lows dropping to around -6°C (22°F).
JanFebMarAprMayJunJulAugSepOctNovDec454959637380828177665350
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 142 mm (5.6 in) over the course of 11 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 142 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec115183179163148118971119215075142
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 10°C (50°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and encouraging travelers to seek cozy indoor activities 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 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%80%82%83%80%80%75%73%76%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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111211119764
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 Weather7°C (46°F)115 mm (4.5 inches)84%moderate
February Weather9°C (49°F)183 mm (7.2 inches)83%high
March Weather15°C (59°F)179 mm (7.1 inches)80%very high
April Weather17°C (63°F)163 mm (6.4 inches)82%very high
May Weather23°C (73°F)147 mm (5.8 inches)83%extreme
June Weather26°C (80°F)118 mm (4.6 inches)80%extreme
July Weather28°C (83°F)97 mm (3.8 inches)80%extreme
August Weather27°C (82°F)111 mm (4.4 inches)75%extreme
September Weather25°C (78°F)91 mm (3.6 inches)73%very high
October Weather19°C (67°F)150 mm (5.9 inches)76%high
November Weather12°C (53°F)75 mm (3.0 inches)84%high
December Weather10°C (50°F)142 mm (5.6 inches)88%moderate

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