| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2g - Southern Puget Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98597 - Yelm, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 34 | 36 | 38 | 44 | 48 | 52 | 52 | 47 | 41 | 37 | 33 | 41 |
| Avg Max Temp (°F) | 45 | 49 | 54 | 59 | 65 | 70 | 76 | 77 | 72 | 61 | 50 | 44 | 60 |
| Avg Precip (In.) | 5.98 | 4.96 | 4.49 | 3.25 | 2.18 | 1.83 | .96 | 1.25 | 1.96 | 3.7 | 6.63 | 6.52 | 43.71 |