| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 62d - Unglaciated Allegheney High Plateau | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 14760 - Olean, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 12 | 21 | 31 | 41 | 50 | 54 | 53 | 46 | 36 | 29 | 19 | 34 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 55 | 67 | 75 | 79 | 77 | 70 | 59 | 46 | 35 | 56 |
| Avg Precip (In.) | 2.23 | 1.87 | 2.79 | 3.09 | 3.46 | 5 | 3.81 | 3.59 | 4.02 | 3.13 | 3.15 | 2.77 | 38.91 |