| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 21 - Jan. 31 | |
| 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 91104 - Pasadena, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 45 | 46 | 49 | 53 | 57 | 61 | 62 | 60 | 54 | 47 | 43 | 52 |
| Avg Max Temp (°F) | 64 | 67 | 69 | 74 | 77 | 83 | 89 | 90 | 87 | 80 | 71 | 65 | 76 |
| Avg Precip (In.) | 4.3 | 4.69 | 4.15 | 1.21 | .47 | .16 | .05 | .18 | .49 | .62 | 1.44 | 2.34 | 20.12 |