Last updated: June 24, 2025
In December, the average temperature in Monticello, United States is a chilly -1°C (30°F). Expect extreme variations, with minimums dropping to -22°C (-7°F) and maximums reaching a mild 21°C (71°F). During this time, the region experiences about 43 mm (1.7 in) of precipitation over 5 days, complemented by an average humidity level of 82%. Stay prepared for the diverse weather conditions!
In December in Monticello, the average temperature is -1°C (30°F), with maximums reaching 21°C (71°F) and minimums dropping as low as -22°C (-7°F). Travelers should be prepared for a wide range of temperatures, from chilly days to potential warm spells, ensuring they pack accordingly for varying weather conditions.
In Monticello in December, the precipitation amount is 43 mm (1.7 in) over the course of 5 days.
In Monticello in December, humidity is 82%. With an average temperature of -1°C (30°F), this humidity feels like a sharp chill that penetrates your clothing, making travel uncomfortable and dampening your spirit as you navigate through the cold, moisture-laden air.
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.
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 (21°F) | 48 mm (1.9 inches) | 84% | moderate |
| February Weather | -5°C (22°F) | 59 mm (2.3 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 67 mm (2.6 inches) | 84% | moderate |
| April Weather | 8°C (47°F) | 80 mm (3.1 inches) | 83% | very high |
| May Weather | 16°C (61°F) | 158 mm (6.2 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 122 mm (4.8 inches) | 79% | extreme |
| July Weather | 24°C (75°F) | 87 mm (3.4 inches) | 75% | very high |
| August Weather | 22°C (72°F) | 84 mm (3.3 inches) | 69% | very high |
| September Weather | 19°C (66°F) | 124 mm (4.9 inches) | 74% | very high |
| October Weather | 11°C (52°F) | 131 mm (5.2 inches) | 79% | moderate |
| November Weather | 3°C (37°F) | 48 mm (1.9 inches) | 88% | moderate |
| December Weather | -1°C (30°F) | 43 mm (1.7 inches) | 82% | moderate |