Last updated: June 24, 2025
In December, the average temperature in Salem, United States hovers around 0°C (32°F). Expect a chilly minimum of -21°C (-6°F), while the warmer days can reach up to 17°C (62°F). Prepare for 121 mm (4.8 in) of precipitation spread over 9 days, and don't forget your umbrella—humidity levels typically reach 81%!
In December in Salem, the average temperature is 0°C (32°F). The maximum can reach 17°C (62°F), and the minimum can be as low as -21°C (-6°F). This climate can provide a unique experience for travelers, offering opportunities for winter sports as well as chilly, crisp outdoor activities.
In Salem in December, the precipitation amount is 121 mm (4.8 in) over the course of 9 days.
In Salem in December, humidity is 81%. With an average temperature of 0°C (32°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring extra layers to stay warm and dry while traveling.
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 | -2°C (29°F) | 68 mm (2.7 inches) | 86% | low |
| February Weather | 0°C (32°F) | 84 mm (3.3 inches) | 84% | moderate |
| March Weather | 3°C (37°F) | 85 mm (3.3 inches) | 82% | moderate |
| April Weather | 9°C (48°F) | 127 mm (5.0 inches) | 80% | very high |
| May Weather | 15°C (59°F) | 82 mm (3.2 inches) | 72% | very high |
| June Weather | 20°C (69°F) | 89 mm (3.5 inches) | 72% | very high |
| July Weather | 23°C (74°F) | 131 mm (5.2 inches) | 67% | very high |
| August Weather | 23°C (74°F) | 77 mm (3.0 inches) | 66% | very high |
| September Weather | 19°C (66°F) | 73 mm (2.9 inches) | 71% | high |
| October Weather | 13°C (55°F) | 128 mm (5.0 inches) | 78% | high |
| November Weather | 5°C (42°F) | 95 mm (3.7 inches) | 84% | moderate |
| December Weather | 0°C (32°F) | 121 mm (4.8 inches) | 81% | low |