Last updated: June 24, 2025
In Gresham, United States, the average temperature in December hovers around -4°C (25°F), with extremes ranging from a chilling -28°C (-18°F) to a surprisingly warm 17°C (62°F). This month sees about 55 mm (2.2 in) of precipitation spread over 7 days, while the average humidity remains high at 87%. Stay prepared for a true winter experience!
In December in Gresham, the average temperature is -4°C (25°F), with maximums reaching 17°C (62°F) and minimums dipping as low as -28°C (-18°F). Travelers should be prepared for a significant temperature range and pack accordingly for both warmth and cooler conditions.
In Gresham in December, the precipitation amount is 55 mm (2.2 in) over the course of 7 days.
In Gresham in December humidity is 87%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that clings to your skin, making every step outside feel like an endeavor as the cold damp air numbs your senses and weighs you down, creating an atmosphere that is both invigorating and challenging for traveling.
In Gresham 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 Gresham, you can visit Hourly UV Index in Gresham.
UV Risk Categories
Weather in Gresham varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Gresham, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -7°C (19°F) | 37 mm (1.5 inches) | 89% | low |
| February Weather | -7°C (19°F) | 49 mm (1.9 inches) | 90% | moderate |
| March Weather | 0°C (32°F) | 59 mm (2.3 inches) | 87% | moderate |
| April Weather | 6°C (43°F) | 101 mm (4.0 inches) | 84% | high |
| May Weather | 14°C (57°F) | 106 mm (4.2 inches) | 77% | very high |
| June Weather | 20°C (68°F) | 107 mm (4.2 inches) | 75% | very high |
| July Weather | 22°C (72°F) | 111 mm (4.4 inches) | 74% | very high |
| August Weather | 20°C (69°F) | 115 mm (4.5 inches) | 73% | very high |
| September Weather | 16°C (62°F) | 77 mm (3.0 inches) | 78% | high |
| October Weather | 9°C (49°F) | 100 mm (3.9 inches) | 84% | moderate |
| November Weather | 1°C (34°F) | 50 mm (2.0 inches) | 89% | moderate |
| December Weather | -4°C (25°F) | 55 mm (2.2 inches) | 87% | low |