Riverside, California Climate: Mediterranean (Csa)
Köppen Csa: Hot-Summer Mediterranean
Riverside enjoys a classic Mediterranean climate—inland, so hotter summers and cooler winters than coastal neighbors.
Temperature Profile
| Metric | Value |
|---|
| Annual mean | 68.2°F (20.1°C) |
| Summer high (Jul) | 97.8°F (36.6°C) |
| Summer low (Aug) | 61.1°F (16.2°C) |
| Winter low (Dec) | 42.2°F (5.7°C) |
| Winter high (Jan) | 65.7°F (18.7°C) |
| Extreme high | 118°F (47.8°C) — June 2017 |
| Extreme low | 19°F (-7.2°C) — Jan 1949 |
Precipitation
- Annual: 12.8 in (325 mm)
- Pattern: Nov–Apr (90%); summer < 0.1 in/month
- Snow: virtually never
Other Features
- Sunshine: ~3,000 hrs/yr (80% possible)
- Humidity: Low summer (10–20%); higher winter (60–80% mornings)
- Santa Ana winds: Fall, hot/dry/gusty — fire risk
- Air quality: Ozone/PM issues (Inland Empire basin)
Seasonal Feel
- Spring: mild, wildflowers, best hiking
- Summer: hot, dry, pool weather
- Fall: warm days, cool nights, Santa Anas
- Winter: mild days, chilly nights, rain storms
Ideal for citrus (historic), avocados, and year-round outdoor life—if you handle summer heat.
Wanderlust World