The official National Weather Service forecast for Rochester — 43.3045°N, 70.9756°W, 18 miles from I-95.
| Strafford County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 35 | 44 | 56 | 67 | 76 | 82 | 80 | 72 | 60 | 48 | 37 | 57 |
| Avg low °F | 14 | 15 | 23 | 33 | 44 | 54 | 60 | 57 | 50 | 39 | 29 | 21 | 37 |
| Precip in | 3.4 | 3.3 | 4.1 | 4.3 | 4.0 | 4.4 | 4.3 | 3.7 | 3.8 | 5.0 | 3.7 | 4.5 | 48.5 |
1996–2025 normals for Strafford County — the climate division Rochester sits in. All-time county record high 99.9°F (2011-07-23); record low -23.0°F (1957-01-18). Source: NOAA / National Weather Service.