Last updated: June 24, 2025
In December, the average temperature in Flat Rock, United States hovers around 1°C (34°F), with potential extremes ranging from a chilly -16°C (4°F) to a mild 13°C (55°F). Expect 74 mm (2.9 in) of precipitation spread over 12 days, contributing to the average humidity of 86%.
In December in Flat Rock, the average temperature is 1°C (34°F). Maximums can reach 13°C (55°F), and minimums can drop as low as -16°C (4°F). Travelers should be prepared for cold conditions and pack accordingly.
In Flat Rock in December, the precipitation amount is 74 mm (2.9 in) over a span of 12 days.
In Flat Rock in December, humidity is 86%. With an average temperature of 1°C (34°F), this humidity feels like a chilling embrace, making outdoor adventures brisk and invigorating but challenging for travel.
In Flat Rock 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 Flat Rock, you can visit Hourly UV Index in Flat Rock.
UV Risk Categories
Weather in Flat Rock varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Flat Rock, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (29°F) | 85 mm (3.3 inches) | 88% | low |
| February Weather | -1°C (30°F) | 83 mm (3.3 inches) | 87% | moderate |
| March Weather | 2°C (37°F) | 88 mm (3.5 inches) | 87% | moderate |
| April Weather | 7°C (46°F) | 101 mm (4.0 inches) | 87% | very high |
| May Weather | 14°C (58°F) | 121 mm (4.8 inches) | 81% | very high |
| June Weather | 21°C (69°F) | 83 mm (3.3 inches) | 82% | very high |
| July Weather | 24°C (75°F) | 96 mm (3.8 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 80 mm (3.2 inches) | 78% | very high |
| September Weather | 20°C (68°F) | 68 mm (2.7 inches) | 78% | very high |
| October Weather | 13°C (57°F) | 118 mm (4.6 inches) | 82% | high |
| November Weather | 5°C (41°F) | 102 mm (4.0 inches) | 89% | moderate |
| December Weather | 1°C (34°F) | 74 mm (2.9 inches) | 86% | low |