Mississippi design temperatures
Outdoor heating and cooling design conditions for 6 Mississippi 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 |
|---|---|---|---|---|---|---|
| Columbus AFBWMO 723306 · 1967–1996 | 220 ft | 20 °F | 24 °F | 94 / 77 °F | 96 / 77 °F | Load calculator |
| Jackson/ThompsonWMO 722350 · 1973–1996 | 331 ft | 21 °F | 25 °F | 94 / 77 °F | 96 / 77 °F | Load calculator |
| Keesler AFB/BiloxiWMO 747686 · 1967–1996 | 33 ft | 30 °F | 34 °F | 92 / 79 °F | 93 / 79 °F | Load calculator |
| McComb/LewisWMO 722358 · 1973–1996 | 413 ft | 23 °F | 27 °F | 92 / 76 °F | 94 / 76 °F | Load calculator |
| Meridian NAS/McCainWMO 722345 · 1973–1996 | 318 ft | 20 °F | 24 °F | 94 / 77 °F | 97 / 77 °F | Load calculator |
| Meridian/KeyWMO 722340 · 1973–1996 | 308 ft | 21 °F | 25 °F | 94 / 76 °F | 96 / 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.