The official National Weather Service forecast for Lathrop — 39.5483°N, 94.3299°W, 3.9 miles from I-35. Forecasts here are written by NWS EAX, this county’s forecast office.
| Clinton County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 42 | 54 | 65 | 75 | 84 | 87 | 86 | 80 | 67 | 54 | 42 | 64 |
| Avg low °F | 18 | 22 | 32 | 42 | 53 | 63 | 67 | 64 | 56 | 44 | 33 | 23 | 43 |
| Precip in | 1.2 | 1.4 | 2.4 | 3.7 | 5.1 | 5.0 | 4.0 | 4.4 | 3.4 | 3.3 | 1.9 | 1.5 | 37.3 |
1996–2025 normals for Clinton County — the climate division Lathrop sits in. All-time county record high 107.3°F (1954-07-13); record low -24.1°F (1989-12-23). Source: NOAA / National Weather Service.