The official National Weather Service forecast for Greenfield — 36.1534°N, 88.8006°W, 31.4 miles from I-40.
| Weakley County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 46 | 51 | 61 | 71 | 79 | 86 | 89 | 89 | 83 | 73 | 60 | 50 | 70 |
| Avg low °F | 28 | 32 | 39 | 47 | 58 | 66 | 69 | 67 | 60 | 48 | 38 | 32 | 49 |
| Precip in | 4.5 | 4.7 | 5.4 | 5.5 | 5.9 | 4.4 | 4.1 | 3.8 | 3.5 | 3.5 | 4.2 | 5.0 | 54.5 |
1996–2025 normals for Weakley County — the climate division Greenfield sits in. All-time county record high 104.9°F (2007-08-17); record low -16.7°F (1951-02-02). Source: NOAA / National Weather Service.