| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 39a - Springfield Plateau |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 72761 - Siloam Springs, AR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 28 | 36 | 44 | 54 | 63 | 67 | 66 | 59 | 47 | 36 | 27 | 46 |
| Avg Max Temp (°F) | 45 | 51 | 60 | 69 | 76 | 84 | 90 | 89 | 81 | 71 | 58 | 48 | 69 |
| Avg Precip (In.) | 2.28 | 2.19 | 4.28 | 4.34 | 5.3 | 4.91 | 3.41 | 3.35 | 5.05 | 3.79 | 4.74 | 3.42 | 47.06 |