| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F 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: | 40b - Osage Cuestas |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 74021 - Collinsville, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 23 | 28 | 38 | 47 | 57 | 66 | 70 | 68 | 61 | 49 | 37 | 28 | 48 |
| Avg Max Temp (°F) | 45 | 52 | 61 | 71 | 78 | 87 | 92 | 92 | 83 | 74 | 59 | 49 | 70 |
| Avg Precip (In.) | 1.56 | 1.95 | 3.58 | 3.89 | 5.37 | 4.67 | 3.14 | 3.01 | 4.81 | 3.65 | 3.62 | 2.24 | 41.5 |