The official National Weather Service forecast for Greenfield — 42.5876°N, 72.5995°W, population 22,294, 1.2 miles from I-91.
| Franklin County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 36 | 44 | 57 | 69 | 77 | 82 | 80 | 73 | 61 | 48 | 37 | 58 |
| Avg low °F | 15 | 17 | 24 | 34 | 45 | 54 | 59 | 58 | 50 | 40 | 30 | 21 | 37 |
| Precip in | 3.6 | 3.1 | 3.7 | 4.1 | 4.1 | 4.7 | 4.6 | 4.3 | 4.6 | 4.8 | 3.3 | 4.5 | 49.4 |
1996–2025 normals for Franklin County — the climate division Greenfield sits in. All-time county record high 96.6°F (2025-06-25); record low -23.8°F (1957-01-18). Source: NOAA / National Weather Service.