The official National Weather Service forecast for Manchester — 42.4841°N, 91.4554°W, population 4,913, 27.3 miles from I-380.
| Delaware County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 27 | 31 | 45 | 59 | 70 | 80 | 83 | 80 | 75 | 62 | 46 | 32 | 58 |
| Avg low °F | 10 | 13 | 26 | 36 | 48 | 58 | 62 | 59 | 52 | 39 | 28 | 17 | 37 |
| Precip in | 1.3 | 1.4 | 2.3 | 3.7 | 4.6 | 5.9 | 4.6 | 4.0 | 3.4 | 3.2 | 1.9 | 1.8 | 38.1 |
1996–2025 normals for Delaware County — the climate division Manchester sits in. All-time county record high 101.7°F (2012-07-26); record low -33.4°F (2009-01-16). Source: NOAA / National Weather Service.