Last updated: June 24, 2025
In December, the average temperature in Sewickley Heights, United States hovers around 2°C (36°F). Expect temperatures to dip as low as -16°C (4°F) and peak at a comfortable 18°C (64°F). Be prepared for some rainfall, with an average precipitation of 99 mm (3.9 in) spread over 11 days. Additionally, the air can feel quite moist, with an average humidity level of 86%.
In December in Sewickley Heights, the average temperature is 2°C (36°F). Maximum temperatures can reach 18°C (64°F), while minimums can drop as low as -16°C (4°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Sewickley Heights, in December, the precipitation amount is 99 mm (3.9 in) over the course of 11 days.
In Sewickley Heights in December, humidity is 86%. With an average temperature of 2°C (36°F), this humidity feels like a biting chill that clings to your skin, making outdoor exploration uncomfortable and dampening any enthusiasm for travel.
In Sewickley Heights 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 Sewickley Heights, you can visit Hourly UV Index in Sewickley Heights.
UV Risk Categories
Weather in Sewickley Heights varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sewickley Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 92 mm (3.6 inches) | 88% | moderate |
| February Weather | 1°C (35°F) | 118 mm (4.6 inches) | 88% | moderate |
| March Weather | 5°C (42°F) | 104 mm (4.1 inches) | 87% | high |
| April Weather | 11°C (52°F) | 130 mm (5.1 inches) | 87% | very high |
| May Weather | 17°C (63°F) | 136 mm (5.4 inches) | 81% | very high |
| June Weather | 21°C (70°F) | 137 mm (5.4 inches) | 83% | very high |
| July Weather | 24°C (75°F) | 137 mm (5.4 inches) | 82% | very high |
| August Weather | 23°C (73°F) | 82 mm (3.2 inches) | 76% | very high |
| September Weather | 20°C (68°F) | 122 mm (4.8 inches) | 77% | very high |
| October Weather | 14°C (57°F) | 123 mm (4.9 inches) | 82% | high |
| November Weather | 6°C (42°F) | 92 mm (3.6 inches) | 89% | moderate |
| December Weather | 2°C (36°F) | 99 mm (3.9 inches) | 86% | low |