The official National Weather Service forecast for Amherst — 42.3672°N, 72.5185°W, 5.7 miles from I-91.
| Hampshire County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 33 | 37 | 45 | 58 | 69 | 77 | 83 | 81 | 74 | 61 | 49 | 38 | 59 |
| Avg low °F | 15 | 18 | 25 | 35 | 46 | 54 | 60 | 58 | 51 | 40 | 30 | 22 | 38 |
| Precip in | 3.5 | 3.1 | 3.8 | 4.1 | 4.1 | 4.6 | 4.6 | 4.3 | 4.7 | 4.7 | 3.3 | 4.4 | 49.2 |
1996–2025 normals for Hampshire County — the climate division Amherst sits in. All-time county record high 97.4°F (1953-09-03); record low -22.3°F (1961-01-22). Source: NOAA / National Weather Service.