Last updated: June 24, 2025
In December, the average temperature in Grand Ronde, United States hovers around 5°C (41°F). You might experience chilly days with temperatures dipping to a minimum of -6°C (21°F), while the mercury can rise to a pleasant maximum of 15°C (59°F). Be prepared for some sprinkles, as the area sees about 210 mm (8.3 in) of precipitation over 19 days. With average humidity levels sitting at a comfortable 87%, it's a time to embrace the refreshing atmosphere.
In December in Grand Ronde, the average temperature is 5°C (41°F). Maximums can reach 15°C (59°F), while minimums can drop as low as -6°C (21°F). Travelers should be prepared for a range of temperatures, ensuring they have appropriate clothing for both chilly and mild conditions.
In Grand Ronde in December, the total precipitation amount is 210 mm (8.3 in) over a span of 19 days.
In Grand Ronde in December humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.
In Grand Ronde 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 Grand Ronde, you can visit Hourly UV Index in Grand Ronde.
UV Risk Categories
Weather in Grand Ronde varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Grand Ronde, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 5°C (41°F) | 194 mm (7.6 inches) | 85% | low |
| February Weather | 5°C (41°F) | 180 mm (7.1 inches) | 84% | moderate |
| March Weather | 7°C (45°F) | 150 mm (5.9 inches) | 85% | moderate |
| April Weather | 9°C (49°F) | 126 mm (4.9 inches) | 83% | high |
| May Weather | 13°C (55°F) | 63 mm (2.5 inches) | 83% | very high |
| June Weather | 16°C (61°F) | 49 mm (1.9 inches) | 83% | very high |
| July Weather | 18°C (65°F) | 5 mm (0.2 inches) | 82% | very high |
| August Weather | 19°C (66°F) | 6 mm (0.2 inches) | 74% | very high |
| September Weather | 16°C (61°F) | 68 mm (2.7 inches) | 71% | high |
| October Weather | 11°C (52°F) | 105 mm (4.1 inches) | 81% | moderate |
| November Weather | 7°C (46°F) | 178 mm (7.0 inches) | 87% | moderate |
| December Weather | 5°C (41°F) | 210 mm (8.3 inches) | 87% | low |