| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Aug. 21 - Aug. 31 |
| Average Last Frost Date: | Jun. 21 - Jun. 30 |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate |
| Ecoregion: | 9e - Pumice Plateau |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 97640 - Summer Lake, OR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 21 | 23 | 27 | 32 | 37 | 44 | 44 | 39 | 31 | 24 | 19 | 30 |
| Avg Max Temp (°F) | 37 | 41 | 47 | 52 | 60 | 69 | 79 | 80 | 73 | 59 | 44 | 37 | 57 |
| Avg Precip (In.) | 3.51 | 2.83 | 2.66 | 1.86 | 1.46 | .96 | .61 | .64 | .81 | 1.67 | 3.52 | 3.21 | 23.74 |