Last updated: June 24, 2025
In December, the average temperature in Greenville, United States hovers around 3°C (38°F), with temperatures ranging from a chilling -18°C (0°F) to a mild 20°C (68°F). Expect about 63 mm (2.5 in) of precipitation over 7 days, contributing to an average humidity level of a damp 87%. Prepare accordingly for a mix of winter chill and occasional warmth!
In December in Greenville, the average temperature is 3°C (38°F). Maximums can reach 20°C (68°F), while minimums can drop as low as -18°C (0°F). Be prepared for a wide range of temperatures when traveling during this time.
In Greenville in December, the precipitation amount is 63 mm (2.5 in) over a span of 7 days.
In Greenville in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Greenville 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 Greenville, you can check the information here.
UV Risk Categories
Weather in Greenville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Greenville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 79 mm (3.1 inches) | 84% | moderate |
| February Weather | 1°C (35°F) | 81 mm (3.2 inches) | 82% | moderate |
| March Weather | 8°C (46°F) | 133 mm (5.2 inches) | 84% | high |
| April Weather | 12°C (55°F) | 143 mm (5.6 inches) | 83% | very high |
| May Weather | 19°C (67°F) | 161 mm (6.3 inches) | 80% | very high |
| June Weather | 25°C (77°F) | 110 mm (4.3 inches) | 83% | extreme |
| July Weather | 26°C (79°F) | 98 mm (3.9 inches) | 82% | extreme |
| August Weather | 24°C (76°F) | 113 mm (4.4 inches) | 82% | very high |
| September Weather | 22°C (72°F) | 61 mm (2.4 inches) | 79% | very high |
| October Weather | 15°C (59°F) | 107 mm (4.2 inches) | 79% | high |
| November Weather | 6°C (43°F) | 79 mm (3.1 inches) | 88% | moderate |
| December Weather | 3°C (38°F) | 63 mm (2.5 inches) | 87% | moderate |