The official National Weather Service forecast for Waterbury — 44.3378°N, 72.7562°W, 0.4 miles from I-89.
| Washington County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 26 | 30 | 38 | 52 | 65 | 73 | 77 | 76 | 69 | 56 | 43 | 32 | 53 |
| Avg low °F | 8 | 9 | 18 | 30 | 41 | 50 | 55 | 54 | 47 | 36 | 26 | 15 | 32 |
| Precip in | 2.8 | 2.7 | 3.2 | 3.7 | 4.0 | 5.0 | 4.9 | 4.1 | 3.6 | 4.6 | 3.4 | 3.8 | 45.8 |
1996–2025 normals for Washington County — the climate division Waterbury sits in. All-time county record high 94.4°F (2025-06-24); record low -34.1°F (1957-01-15). Source: NOAA / National Weather Service.