Last updated: June 24, 2025
In Piedmont, United States, the average temperature in December hovers around -1°C (30°F), leading to a stunning winter wonderland. However, be prepared for temperature swings, with a minimum dipping as low as -24°C (-11°F) and a maximum reaching 20°C (69°F). During this time, you can expect about 32 mm (1.3 in) of precipitation over approximately 7 days, while the average humidity remains a brisk 79%. Don’t forget your coat!
In December in Piedmont, the average temperature is -1°C (30°F), with maximums reaching 20°C (69°F) and minimums dropping as low as -24°C (-11°F). This wide temperature range suggests that travelers should be prepared for both chilly and relatively mild conditions during their visit.
In Piedmont in December, the precipitation amount is 32 mm (1.3 in) over the course of 7 days.
In Piedmont in December, humidity is 79%. With an average temperature of -1°C (30°F), this humidity feels like a biting chill in the air, making outdoor activities uncomfortable and requiring extra layers to stay warm while exploring.
In Piedmont 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 Piedmont, you can visit Hourly UV Index in Piedmont.
UV Risk Categories
Weather in Piedmont varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Piedmont, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 20 mm (0.8 inches) | 77% | moderate |
| February Weather | -6°C (21°F) | 34 mm (1.3 inches) | 80% | moderate |
| March Weather | 1°C (35°F) | 49 mm (1.9 inches) | 70% | high |
| April Weather | 4°C (39°F) | 88 mm (3.5 inches) | 70% | very high |
| May Weather | 10°C (50°F) | 130 mm (5.1 inches) | 76% | very high |
| June Weather | 18°C (64°F) | 108 mm (4.2 inches) | 84% | extreme |
| July Weather | 21°C (70°F) | 130 mm (5.1 inches) | 85% | extreme |
| August Weather | 19°C (67°F) | 82 mm (3.2 inches) | 84% | very high |
| September Weather | 15°C (59°F) | 53 mm (2.1 inches) | 77% | very high |
| October Weather | 6°C (43°F) | 65 mm (2.6 inches) | 73% | moderate |
| November Weather | 2°C (36°F) | 21 mm (0.8 inches) | 74% | moderate |
| December Weather | -1°C (30°F) | 32 mm (1.3 inches) | 79% | low |