| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 9a: 20°F to 25°F Zone 10a: 30°F to 35°F Zone 9b: 25°F to 30°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 11 - Jan. 20 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 93405 - San Luis Obispo, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 41 | 42 | 44 | 44 | 47 | 50 | 53 | 53 | 52 | 49 | 44 | 41 | 47 |
| Avg Max Temp (°F) | 65 | 66 | 67 | 71 | 72 | 76 | 79 | 80 | 80 | 78 | 71 | 66 | 73 |
| Avg Precip (In.) | 4.91 | 4.7 | 3.86 | 1.32 | .48 | .08 | .03 | .07 | .34 | .84 | 1.98 | 3.43 | 22.05 |