| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 45040 - Mason, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 31 | 40 | 50 | 59 | 63 | 61 | 54 | 42 | 33 | 25 | 42 |
| Avg Max Temp (°F) | 37 | 42 | 52 | 64 | 74 | 82 | 86 | 85 | 78 | 67 | 53 | 42 | 63 |
| Avg Precip (In.) | 3.01 | 2.61 | 3.53 | 4.14 | 4.81 | 4.07 | 4.04 | 3.9 | 3.06 | 3 | 3.46 | 3.13 | 42.76 |