The official National Weather Service forecast for Hornsby — 35.2276°N, 88.8295°W, 28.6 miles from I-40.
| Hardeman County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 50 | 54 | 64 | 73 | 80 | 88 | 90 | 90 | 85 | 74 | 62 | 53 | 72 |
| Avg low °F | 30 | 34 | 41 | 48 | 58 | 66 | 70 | 68 | 61 | 49 | 39 | 33 | 50 |
| Precip in | 4.7 | 5.2 | 5.8 | 5.5 | 5.4 | 4.5 | 4.3 | 3.7 | 4.0 | 3.8 | 4.0 | 5.4 | 56.3 |
1996–2025 normals for Hardeman County — the climate division Hornsby sits in. All-time county record high 106.0°F (2007-08-16); record low -14.9°F (1951-02-02). Source: NOAA / National Weather Service.