| 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 Zone 5b: -15°F to -10°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: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 67a - Northern Limestone/Dolomite Valleys |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 16693 - Williamsburg, PA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 28 | 37 | 47 | 56 | 60 | 59 | 52 | 41 | 33 | 24 | 40 |
| Avg Max Temp (°F) | 35 | 38 | 48 | 60 | 71 | 78 | 83 | 81 | 74 | 63 | 50 | 39 | 60 |
| Avg Precip (In.) | 2.78 | 2.51 | 3.33 | 3.31 | 4.23 | 4.15 | 3.75 | 3.34 | 3.71 | 3.21 | 3.25 | 2.79 | 40.36 |