The official National Weather Service forecast for Nashua — 42.9528°N, 92.5363°W, 34.6 miles from I-380.
| Chickasaw County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 25 | 29 | 43 | 57 | 69 | 79 | 82 | 80 | 74 | 61 | 45 | 31 | 56 |
| Avg low °F | 8 | 11 | 24 | 34 | 47 | 57 | 61 | 58 | 50 | 38 | 26 | 15 | 36 |
| Precip in | 1.0 | 1.1 | 2.0 | 3.6 | 5.0 | 6.0 | 4.7 | 4.4 | 3.6 | 2.8 | 1.6 | 1.4 | 37.2 |
1996–2025 normals for Chickasaw County — the climate division Nashua sits in. All-time county record high 102.3°F (1988-08-18); record low -33.2°F (1996-02-03). Source: NOAA / National Weather Service.