The official National Weather Service forecast for Calypso — 35.1538°N, 78.1053°W, 6.2 miles from I-40. Forecasts here are written by NWS MHX, this county’s forecast office.
| Duplin County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 55 | 59 | 66 | 74 | 81 | 87 | 89 | 88 | 83 | 74 | 65 | 58 | 73 |
| Avg low °F | 32 | 36 | 41 | 49 | 58 | 66 | 70 | 69 | 63 | 51 | 41 | 35 | 51 |
| Precip in | 3.5 | 3.4 | 3.6 | 3.7 | 4.6 | 4.9 | 6.2 | 6.1 | 7.0 | 3.1 | 3.2 | 3.7 | 53.0 |
1996–2025 normals for Duplin County — the climate division Calypso sits in. All-time county record high 103.2°F (1952-06-27); record low -2.0°F (1985-01-21). Source: NOAA / National Weather Service.