Pennsylvania design temperatures
Outdoor heating and cooling design conditions for 11 Pennsylvania 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 |
|---|---|---|---|---|---|---|
| Allentown/BethlehemWMO 725170 · 1973–1996 | 384 ft | 6 °F | 10 °F | 88 / 72 °F | 91 / 74 °F | Load calculator |
| Altoona/BlairWMO 725126 · 1973–1996 | 1,503 ft | 3 °F | 8 °F | 85 / 71 °F | 88 / 72 °F | Load calculator |
| Du BoisWMO 725125 · 1973–1996 | 1,818 ft | −2 °F | 4 °F | 83 / 68 °F | 85 / 70 °F | Load calculator |
| Johnstown/CambriaWMO 725127 · 1973–1996 | 2,284 ft | 1 °F | 6 °F | 84 / 70 °F | 87 / 72 °F | Load calculator |
| Middletown/OlmstedWMO 725115 · 1973–1996 | 308 ft | 10 °F | 14 °F | 89 / 73 °F | 92 / 75 °F | Load calculator |
| PhiladelphiaWMO 724080 · 1973–1996 | 30 ft | 11 °F | 15 °F | 90 / 75 °F | 93 / 76 °F | Load calculator |
| Philadelphia NortheastWMO 724085 · 1973–1996 | 121 ft | 10 °F | 14 °F | 90 / 74 °F | 92 / 75 °F | Load calculator |
| Pittsburgh IntlWMO 725200 · 1973–1996 | 1,224 ft | 1 °F | 7 °F | 86 / 71 °F | 89 / 73 °F | Load calculator |
| Wilkes-Barre/ScrantonWMO 725130 · 1973–1996 | 948 ft | 2 °F | 7 °F | 85 / 70 °F | 88 / 72 °F | Load calculator |
| WilliamsportWMO 725140 · 1973–1996 | 525 ft | 2 °F | 7 °F | 87 / 72 °F | 90 / 73 °F | Load calculator |
| Willow GroveWMO 724086 · 1973–1996 | 361 ft | 9 °F | 13 °F | 89 / 73 °F | 92 / 75 °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.