Last updated: June 24, 2025
In December, the average temperature in Monticello, United States hovers around 0°C (32°F). Expect chilly conditions with minimums plunging to -17°C (2°F) and maximums reaching a mild 16°C (61°F). During this month, precipitation averages 113 mm (4.4 in) over 11 days, contributing to an average humidity of 80%—perfect for cozy indoor activities!
In December in Monticello, the average temperature is 0°C (32°F), with a maximum that can reach 16°C (61°F) and a minimum that can dip as low as -17°C (2°F). It's advisable to pack layers and be prepared for chilly conditions if you plan to travel during this time.
In Monticello in December, the precipitation amount is 113 mm (4.4 in) over the course of 11 days.
In Monticello in December humidity is 80%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill clinging to your skin, making every step outside feel uncomfortable and the air heavy, potentially deterring travelers who are unaccustomed to such conditions.
In Monticello in December, 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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 82 mm (3.2 inches) | 84% | moderate |
| February Weather | -2°C (30°F) | 108 mm (4.2 inches) | 82% | moderate |
| March Weather | 2°C (35°F) | 97 mm (3.8 inches) | 81% | high |
| April Weather | 8°C (47°F) | 127 mm (5.0 inches) | 78% | very high |
| May Weather | 14°C (58°F) | 139 mm (5.5 inches) | 69% | very high |
| June Weather | 19°C (66°F) | 115 mm (4.5 inches) | 69% | very high |
| July Weather | 22°C (72°F) | 121 mm (4.8 inches) | 62% | very high |
| August Weather | 21°C (70°F) | 127 mm (5.0 inches) | 65% | very high |
| September Weather | 17°C (64°F) | 98 mm (3.8 inches) | 68% | very high |
| October Weather | 12°C (53°F) | 153 mm (6.0 inches) | 74% | high |
| November Weather | 4°C (39°F) | 105 mm (4.1 inches) | 82% | moderate |
| December Weather | 0°C (32°F) | 113 mm (4.4 inches) | 80% | low |