| 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 91020 - Montrose, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 45 | 45 | 48 | 52 | 57 | 61 | 62 | 60 | 54 | 47 | 43 | 51 |
| Avg Max Temp (°F) | 65 | 67 | 69 | 73 | 77 | 84 | 90 | 91 | 86 | 79 | 71 | 65 | 76 |
| Avg Precip (In.) | 4.57 | 5.55 | 4.92 | 1.33 | .53 | .18 | .04 | .21 | .51 | .71 | 1.61 | 2.58 | 22.74 |