The official National Weather Service forecast for Errol — 44.7814°N, 71.1379°W, 45.3 miles from I-93.
| Coos County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 24 | 28 | 36 | 49 | 63 | 71 | 76 | 74 | 67 | 54 | 41 | 30 | 51 |
| Avg low °F | 5 | 7 | 15 | 27 | 39 | 48 | 53 | 52 | 45 | 35 | 24 | 13 | 30 |
| Precip in | 3.2 | 2.8 | 3.2 | 3.8 | 4.3 | 5.0 | 4.9 | 4.3 | 3.8 | 4.8 | 3.6 | 4.2 | 47.9 |
1996–2025 normals for Coos County — the climate division Errol sits in. All-time county record high 92.6°F (1975-08-03); record low -36.5°F (1957-01-15). Source: NOAA / National Weather Service.