Last updated: June 24, 2025
In Monticello, United States, the average temperature in December hovers around -1°C (30°F), making it a chilly time of year. Prepare for temperature variations, with minimums dipping as low as -22°C (-7°F) and highs peaking at 19°C (66°F). Expect approximately 49 mm (1.9 in) of precipitation spread over 6 days, all while the humidity remains high at 81%. Bundle up and enjoy the wintry atmosphere!
In December in Monticello, the average temperature is -1°C (30°F), with maximums reaching up to 19°C (66°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures, from chilly conditions to milder days.
In Monticello in December, the precipitation amount is 49 mm (1.9 in) over the course of 6 days.
In Monticello in December, humidity is 81%. With an average temperature of -1°C (30°F), this humidity feels like an extra layer of chill settles in, making travel uncomfortable and the cold air cling to your skin, dampening the experience with every breath.
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 | -6°C (22°F) | 55 mm (2.2 inches) | 85% | moderate |
| February Weather | -5°C (24°F) | 54 mm (2.1 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 59 mm (2.3 inches) | 85% | high |
| April Weather | 8°C (47°F) | 97 mm (3.8 inches) | 85% | very high |
| May Weather | 16°C (60°F) | 136 mm (5.3 inches) | 78% | very high |
| June Weather | 22°C (71°F) | 124 mm (4.9 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 78 mm (3.1 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 106 mm (4.2 inches) | 76% | very high |
| September Weather | 19°C (66°F) | 118 mm (4.6 inches) | 79% | very high |
| October Weather | 11°C (52°F) | 113 mm (4.5 inches) | 83% | moderate |
| November Weather | 3°C (37°F) | 43 mm (1.7 inches) | 88% | moderate |
| December Weather | -1°C (30°F) | 49 mm (1.9 inches) | 81% | low |