The official National Weather Service forecast for Walpole — 43.0795°N, 72.4259°W, 1.9 miles from I-91.
| Cheshire County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 31 | 35 | 43 | 56 | 67 | 76 | 81 | 79 | 72 | 59 | 47 | 36 | 57 |
| Avg low °F | 13 | 15 | 22 | 33 | 44 | 53 | 58 | 56 | 49 | 39 | 28 | 20 | 36 |
| Precip in | 3.3 | 3.1 | 3.5 | 3.8 | 3.9 | 4.7 | 4.7 | 4.3 | 4.3 | 4.8 | 3.3 | 4.2 | 47.9 |
1996–2025 normals for Cheshire County — the climate division Walpole sits in. All-time county record high 95.5°F (1975-08-03); record low -27.7°F (1957-01-14). Source: NOAA / National Weather Service.