Idaho Climate Data

Idaho Climate Data

We offer an Idaho Manual J for $79 in 4-6 hours.  We can also offer Idaho Manual S $79 and Idaho Manual D $99.

Below is a collection of Idaho Climate Data and outdoor design conditions. We included an Idaho state average of each category at the bottom of the Manual J climate data table. We created this to allow an easy to use free resource for Manual J professionals to use on jobsites, in the field, and while calculating Manual J heat loss and heat gain reports. If you have a custom set of data from Idaho we would consider adding to the Idaho Climate Data table simply email it to

We can also create a Manual J using climate data from the tables below. Email pdf plans, jobsite address, and square footage to and we will get your Idaho Manual J taken care of.

Free Manual J

IdahoElevation in FeetLatitude North DegreesHeating 99% Outdoor Dry BulbCooling Outdoor Air 1% Dry BulbCooling Outdoor Air Coincident Wet BulbCooling Design Grains 55% Relative Humidity IndoorsCooling Design Grains 45% Relative Humidity IndoorsCooling Design Grains 45% Relative Humidity IndoorsDaily RatingHeating Design Days 65 degrees/Colling Design Days 50 degrees Ratio
Boise Air Terminal286744119563-34-27-20H1.86
Burley Municipal airport41574369163-28-21-13H2.64
Caldwell Automated Weather Observation System242844169365-22-15-8H2.13
Coeur D`Alene Automated Weather Observation System232048128962-28-21-14H3.78
Elk City Remote Automatic Meterological Observing System409846169166-13-53H2.41
Idaho Falls, Fanning Field474444-28961-36-28-20H4.12
Joslin Magic Valley Airport airport425542129163-27-20-12H2.31
Lewiston, Nez Perce Co. airport143746189465-27-20-13H1.72
Mccall airport502045-28358-39-32-24H9.18
Mountain Home Air Force Base29924399663-39-32-25H2
Mullan AWRS33174788461-25-18-10H5.59
Pocatello Regional airport44784319161-38-30-22H3.2
Salmon, Lemhi Co, airport Automated Weather Observation System40454518861-35-27-20H4.87
Twin Falls airport41504229561-44-36-29H2.52
Idaho State Average3479.941176470644.64705882356.882352941290.529411764762.1176470588-31.8823529412-24.5294117647-17.0588235294H3.5047058824


Idaho Climate Data
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Idaho Climate Data
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Email order number, PDF Plans, jobsite address, and square footage to