Last updated: June 24, 2025
In December, the average temperature in Salem, United States hovers around 2°C (36°F). While it can dip to a chilly -15°C (5°F), the mercury may rise to a mild 17°C (63°F) on warmer days. Expect about 133 mm (5.2 in) of precipitation spread over 10 days, with an average humidity level of 80%, creating a crisp and occasionally damp atmosphere.
In December in Salem, the average temperature is 2°C (36°F). Maximums can reach 17°C (63°F), while minimums can plummet to as low as -15°C (5°F). Travelers should be prepared for a wide range of temperatures and dress accordingly to ensure comfort during their stay.
In Salem in December, the total precipitation amount is 133 mm (5.2 in) spread over a period of 10 days.
In Salem in December humidity is 80%. With an average temperature of 2°C (36°F), this humidity feels like a heavy, damp chill that seeps into your bones, making it challenging for outdoor adventures and often necessitating layered clothing to stay warm and comfortable while exploring.
In Salem 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 Salem, you can visit Hourly UV Index in Salem.
UV Risk Categories
Weather in Salem varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Salem, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 70 mm (2.8 inches) | 84% | moderate |
| February Weather | 1°C (34°F) | 90 mm (3.5 inches) | 84% | moderate |
| March Weather | 4°C (39°F) | 95 mm (3.7 inches) | 82% | high |
| April Weather | 9°C (49°F) | 128 mm (5.1 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 111 mm (4.4 inches) | 75% | very high |
| June Weather | 20°C (69°F) | 95 mm (3.8 inches) | 78% | very high |
| July Weather | 24°C (75°F) | 158 mm (6.2 inches) | 76% | very high |
| August Weather | 23°C (74°F) | 107 mm (4.2 inches) | 76% | very high |
| September Weather | 19°C (67°F) | 96 mm (3.8 inches) | 75% | very high |
| October Weather | 14°C (57°F) | 131 mm (5.2 inches) | 75% | high |
| November Weather | 7°C (44°F) | 96 mm (3.8 inches) | 80% | moderate |
| December Weather | 2°C (36°F) | 133 mm (5.2 inches) | 80% | low |