Oregon design temperatures
Outdoor heating and cooling design conditions for 11 Oregon 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 |
|---|---|---|---|---|---|---|
| Astoria/ClatsopWMO 727910 · 1973–1996 | 23 ft | 25 °F | 29 °F | 72 / 62 °F | 77 / 64 °F | Load calculator |
| BurnsWMO 726830 · 1973–1996 | 4,170 ft | −1 °F | 6 °F | 89 / 60 °F | 92 / 60 °F | Load calculator |
| Eugene/Mahlon SweetWMO 726930 · 1973–1996 | 374 ft | 21 °F | 25 °F | 88 / 66 °F | 92 / 67 °F | Load calculator |
| Klamath Falls/Kings FldWMO 725895 · 1967–1996 | 4,091 ft | 5 °F | 11 °F | 88 / 61 °F | 91 / 63 °F | Load calculator |
| Medford/Jackson Co.WMO 725970 · 1973–1996 | 1,329 ft | 22 °F | 25 °F | 95 / 66 °F | 99 / 67 °F | Load calculator |
| North BendWMO 726917 · 1973–1996 | 13 ft | 30 °F | 33 °F | 69 / 60 °F | 71 / 60 °F | Load calculator |
| PendletonWMO 726880 · 1973–1996 | 1,496 ft | 3 °F | 10 °F | 93 / 63 °F | 96 / 64 °F | Load calculator |
| PortlandWMO 726980 · 1973–1996 | 39 ft | 22 °F | 27 °F | 87 / 66 °F | 91 / 68 °F | Load calculator |
| RedmondWMO 726835 · 1973–1996 | 3,078 ft | 1 °F | 9 °F | 89 / 60 °F | 93 / 62 °F | Load calculator |
| Salem/McNaryWMO 726940 · 1973–1996 | 200 ft | 20 °F | 25 °F | 88 / 66 °F | 92 / 67 °F | Load calculator |
| Sexton SummitWMO 725975 · 1973–1996 | 3,842 ft | 21 °F | 24 °F | 80 / 59 °F | 84 / 61 °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.