The official National Weather Service forecast for Saint John — 38.0022°N, 98.7601°W, 60.3 miles from I-70.
| Stafford County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 43 | 47 | 58 | 68 | 77 | 88 | 92 | 90 | 83 | 70 | 57 | 46 | 68 |
| Avg low °F | 20 | 22 | 32 | 41 | 52 | 63 | 67 | 66 | 57 | 44 | 32 | 23 | 43 |
| Precip in | 0.7 | 0.9 | 1.8 | 2.0 | 4.0 | 4.0 | 3.4 | 3.6 | 2.2 | 2.2 | 1.1 | 0.9 | 26.8 |
1996–2025 normals for Stafford County — the climate division Saint John sits in. All-time county record high 109.3°F (1980-06-28); record low -20.0°F (1989-12-23). Source: NOAA / National Weather Service.