| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Frost Rare | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 91103 - Pasadena, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 45 | 47 | 49 | 53 | 57 | 61 | 62 | 60 | 55 | 48 | 44 | 52 |
| Avg Max Temp (°F) | 65 | 68 | 69 | 74 | 77 | 83 | 89 | 90 | 87 | 80 | 72 | 66 | 77 |
| Avg Precip (In.) | 4.37 | 4.85 | 4.41 | 1.19 | .47 | .16 | .05 | .19 | .46 | .64 | 1.48 | 2.41 | 20.68 |