Wyoming design temperatures
Outdoor heating and cooling design conditions for 5 Wyoming 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 |
|---|---|---|---|---|---|---|
| CasperWMO 725690 · 1973–1996 | 5,289 ft | −13 °F | −5 °F | 90 / 59 °F | 93 / 59 °F | Load calculator |
| Cheyenne/F. E. Warren AFBWMO 725640 · 1967–1996 | 6,142 ft | −5 °F | 1 °F | 85 / 57 °F | 88 / 58 °F | Load calculator |
| Lander/HuntWMO 725760 · 1973–1996 | 5,558 ft | −13 °F | −6 °F | 88 / 58 °F | 91 / 58 °F | Load calculator |
| Rock SpringsWMO 725744 · 1973–1996 | 6,759 ft | −9 °F | −2 °F | 84 / 54 °F | 86 / 54 °F | Load calculator |
| SheridanWMO 726660 · 1973–1996 | 3,967 ft | −15 °F | −8 °F | 91 / 62 °F | 95 / 64 °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.