The official National Weather Service forecast for Storm Lake — 42.6411°N, 95.2097°W, population 11,860, 59.7 miles from I-29.
| Buena Vista County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 26 | 31 | 45 | 59 | 70 | 81 | 84 | 81 | 76 | 62 | 46 | 31 | 58 |
| Avg low °F | 9 | 12 | 25 | 36 | 48 | 59 | 63 | 60 | 52 | 39 | 26 | 15 | 37 |
| Precip in | 0.7 | 0.9 | 1.6 | 3.0 | 4.1 | 4.7 | 3.5 | 3.8 | 2.6 | 2.4 | 1.3 | 1.1 | 29.7 |
1996–2025 normals for Buena Vista County — the climate division Storm Lake sits in. All-time county record high 103.0°F (1955-07-31); record low -29.3°F (1970-01-21). Source: NOAA / National Weather Service.