The official National Weather Service forecast for Lena — 44.9511°N, 88.0468°W, 27 miles from I-43. Forecasts here are written by NWS GRB, this county’s forecast office.
| Oconto County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 25 | 29 | 41 | 53 | 66 | 76 | 80 | 78 | 71 | 57 | 43 | 30 | 54 |
| Avg low °F | 9 | 10 | 20 | 31 | 42 | 53 | 57 | 56 | 48 | 37 | 27 | 15 | 34 |
| Precip in | 1.3 | 1.2 | 2.1 | 3.0 | 3.4 | 4.3 | 3.7 | 3.3 | 3.2 | 2.9 | 1.9 | 1.7 | 32.0 |
1996–2025 normals for Oconto County — the climate division Lena sits in. All-time county record high 98.8°F (2006-07-16); record low -35.2°F (1982-01-17). Source: NOAA / National Weather Service.