| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 27o - Cross Timbers Transition |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 73071 - Norman, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 30 | 38 | 48 | 58 | 66 | 70 | 69 | 62 | 50 | 38 | 29 | 49 |
| Avg Max Temp (°F) | 49 | 55 | 64 | 73 | 80 | 88 | 94 | 93 | 85 | 75 | 61 | 51 | 72 |
| Avg Precip (In.) | 1.47 | 1.86 | 3.2 | 3.31 | 5.4 | 4.66 | 2.77 | 2.54 | 3.91 | 3.72 | 2.62 | 2.06 | 37.52 |