Virginia design temperatures
Outdoor heating and cooling design conditions for 12 Virginia weather stations. Choose the station nearest to you in distance and elevation, and check whether your building department specifies its own values.
| Station | Elevation | 99.6 % heating | 99 % heating | 1 % cooling / MCWB | 0.4 % cooling / MCWB | Use it |
|---|---|---|---|---|---|---|
| CharlottesvilleWMO 724016 · 1973–1996 | 640 ft | 14 °F | 19 °F | 91 / 75 °F | 93 / 76 °F | Load calculator |
| Fort BelvoirWMO 724037 · 1967–1996 | 69 ft | 12 °F | 16 °F | 91 / 76 °F | 94 / 77 °F | Load calculator |
| Langley AFB/HamptonWMO 745980 · 1967–1996 | 10 ft | 19 °F | 23 °F | 90 / 77 °F | 93 / 78 °F | Load calculator |
| Newport NewsWMO 723086 · 1973–1996 | 43 ft | 17 °F | 21 °F | 92 / 77 °F | 94 / 78 °F | Load calculator |
| NorfolkWMO 723080 · 1973–1996 | 30 ft | 20 °F | 24 °F | 91 / 76 °F | 94 / 77 °F | Load calculator |
| Norfolk NAS/ChamberWMO 723085 · 1973–1996 | 16 ft | 21 °F | 25 °F | 91 / 77 °F | 94 / 78 °F | Load calculator |
| Oceana NAS/SoucekWMO 723075 · 1973–1996 | 23 ft | 19 °F | 23 °F | 90 / 76 °F | 93 / 77 °F | Load calculator |
| QuanticoWMO 724035 · 1973–1996 | 13 ft | 16 °F | 20 °F | 91 / 76 °F | 93 / 77 °F | Load calculator |
| Richmond/Byrd FieldWMO 724010 · 1973–1996 | 177 ft | 14 °F | 18 °F | 92 / 76 °F | 95 / 77 °F | Load calculator |
| RoanokeWMO 724110 · 1973–1996 | 1,175 ft | 12 °F | 16 °F | 90 / 73 °F | 92 / 73 °F | Load calculator |
| Washington/DullesWMO 724030 · 1973–1996 | 322 ft | 9 °F | 14 °F | 90 / 74 °F | 93 / 76 °F | Load calculator |
| Washington/NationalWMO 724050 · 1973–1996 | 66 ft | 15 °F | 19 °F | 92 / 76 °F | 94 / 77 °F | Load calculator |
Using these values
- Heat-loss calculations for homes commonly use the 99 % heating value, and cooling loads the 1 % dry bulb with its mean coincident wet bulb (MCWB). The 99.6 % and 0.4 % values are more conservative.
- “Load calculator” opens the heating and cooling load calculator with that station’s 99 % and 1 % temperatures and its design moisture difference (outdoor air at the 1 % condition versus 75 °F, 50 % RH indoors, at the station’s elevation).
- Source: U.S. Air Force Combat Climatology Center and NOAA National Climatic Data Center, Engineering Weather Data (1999; public domain). Each station’s period of record is shown under its name; they end by 1996, and the climate has warmed since, so check local requirements before relying on a value for a permit.