| 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 92078 - San Marcos, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 44 | 46 | 48 | 54 | 57 | 60 | 62 | 60 | 54 | 46 | 42 | 51 |
| Avg Max Temp (°F) | 67 | 68 | 70 | 73 | 75 | 80 | 86 | 87 | 84 | 79 | 73 | 68 | 76 |
| Avg Precip (In.) | 3.06 | 2.73 | 2.91 | .99 | .34 | .14 | .04 | .11 | .3 | .5 | 1.27 | 1.65 | 14.03 |