| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 67a - Northern Limestone/Dolomite Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16662 - Martinsburg, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 21 | 29 | 38 | 48 | 57 | 61 | 59 | 52 | 42 | 34 | 24 | 40 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 60 | 70 | 78 | 82 | 80 | 73 | 62 | 50 | 39 | 60 |
| Avg Precip (In.) | 2.45 | 2.37 | 3.26 | 3.3 | 3.92 | 3.92 | 3.73 | 2.96 | 3.21 | 2.84 | 3.17 | 2.47 | 37.6 |