Monthly climate averages for Pendleton, United States. Based on 10-year ERA5 reanalysis data.
Csa Hot-Summer Mediterranean
Climate OverviewPendleton, United States in December has cold conditions, with highs averaging around 6.6°C (44°F). Rain falls on about 13 days this month.
This month falls at the beginning of Winter. Cold conditions dominate the month.
Temperatures remain fairly steady throughout December, with daily highs around 6°C (43°F).
December sees fairly even rainfall, totalling about 66 mm across the month.
The warmest days tend to fall around the 20th, averaging 8.5°C (47°F).
Compared to November, this month is about 5°C cooler with 2 more rainy days.
Daily averages based on historical data (2016–2025)
Cold daytime highs of 7°C (44°F) mean shorter outdoor excursions with warming breaks. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 7°C / -1°C | 4°C / -5°C | 13days (61 mm) Wet | 5.5h Fair | 77% Humid | 1.9 Low | Poor | View Details |
| February | 8°C / -1°C | 5°C / -5°C | 14days (64 mm) Wet | 6.8h Fair | 73% Muggy | 2.7 Moderate | Poor | View Details |
| March | 13°C / 2°C | 10°C / -2°C | 12days (56 mm) Wet | 8.9h Good | 68% Muggy | 4.1 Moderate | Poor | View Details |
| April | 17°C / 5°C | 15°C / 2°C | 9days (42 mm) Wet | 10.8h Excellent | 59% Moderate | 5.7 High | Fair | View Details |
| May best | 23°C / 10°C | 21°C / 7°C | 6days (39 mm) Good | 12.3h Excellent | 53% Moderate | 6.5 High | Excellent | View Details |
| June best | 28°C / 14°C | 26°C / 12°C | 3days (19 mm) Excellent | 13.2h Excellent | 44% Moderate | 7.2 Very High | Excellent | View Details |
| July best | 33°C / 18°C | 32°C / 17°C | 1days (2 mm) Excellent | 13.8h Excellent | 32% Comfortable | 7.5 Very High | Excellent | View Details |
| August best | 32°C / 18°C | 31°C / 17°C | 1days (6 mm) Excellent | 12.4h Excellent | 37% Comfortable | 6.5 High | Excellent | View Details |
| September best | 27°C / 13°C | 25°C / 12°C | 4days (16 mm) Good | 10.8h Excellent | 48% Moderate | 5.3 High | Excellent | View Details |
| October | 18°C / 7°C | 16°C / 5°C | 8days (46 mm) Wet | 8.5h Good | 62% Muggy | 3.6 Moderate | Good | View Details |
| November | 11°C / 3°C | 9°C / 0°C | 11days (61 mm) Wet | 6.3h Fair | 74% Muggy | 2 Low | Poor | View Details |
| December | 7°C / -1°C | 3°C / -4°C | 13days (66 mm) Wet | 5h Fair | 78% Humid | 1.5 Low | Poor | View Details |
Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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