Last updated: June 24, 2025
In Berwyn Heights, United States, the average temperature in December hovers around 5°C (41°F). Temperature extremes can range from a chilly -10°C (13°F) to a pleasant 20°C (69°F). Expect 93 mm (3.7 in) of precipitation over approximately 9 days, contributing to an average humidity of 84%. 🌧️✨
In December in Berwyn Heights, the average temperature is 5°C (41°F), with maximums reaching up to 20°C (69°F) and minimums dropping as low as -10°C (13°F). It's advisable to pack layers to prepare for the wide range of temperatures you'll encounter while traveling.
In Berwyn Heights in December, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.
In Berwyn Heights in December humidity is 84%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through the cold, heavy air that clings to your skin.
In Berwyn Heights 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 Berwyn Heights, you can check the information here.
UV Risk Categories
Weather in Berwyn Heights varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Berwyn Heights, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 3°C (37°F) | 61 mm (2.4 inches) | 84% | moderate |
| February Weather | 5°C (41°F) | 98 mm (3.9 inches) | 83% | moderate |
| March Weather | 8°C (46°F) | 87 mm (3.4 inches) | 83% | high |
| April Weather | 14°C (57°F) | 100 mm (4.0 inches) | 81% | very high |
| May Weather | 19°C (66°F) | 127 mm (5.0 inches) | 78% | very high |
| June Weather | 24°C (75°F) | 118 mm (4.7 inches) | 79% | very high |
| July Weather | 27°C (81°F) | 157 mm (6.2 inches) | 74% | very high |
| August Weather | 25°C (77°F) | 140 mm (5.5 inches) | 72% | very high |
| September Weather | 22°C (72°F) | 95 mm (3.8 inches) | 75% | very high |
| October Weather | 17°C (62°F) | 104 mm (4.1 inches) | 81% | high |
| November Weather | 8°C (47°F) | 81 mm (3.2 inches) | 85% | moderate |
| December Weather | 5°C (41°F) | 93 mm (3.7 inches) | 84% | moderate |