The official National Weather Service forecast for Fairbury — 40.1372°N, 97.1806°W, population 4,011, 48.3 miles from I-80.
| Jefferson County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 41 | 54 | 65 | 75 | 85 | 89 | 87 | 80 | 68 | 54 | 40 | 65 |
| Avg low °F | 16 | 19 | 30 | 40 | 51 | 62 | 66 | 64 | 56 | 43 | 30 | 20 | 41 |
| Precip in | 0.7 | 0.9 | 1.7 | 2.7 | 4.8 | 4.4 | 3.7 | 3.4 | 2.9 | 2.4 | 1.3 | 1.0 | 29.9 |
1996–2025 normals for Jefferson County — the climate division Fairbury sits in. All-time county record high 109.3°F (1954-07-13); record low -25.5°F (2021-02-16). Source: NOAA / National Weather Service.