Manual J design temperatures for Pittsburgh, PA
Winter 10.4 °F, summer 85.8 °F / 70.7 °F wet bulb, daily range M: the outdoor design conditions for a residential load calculation in Pittsburgh, with a free lookup for any address.
Pittsburgh, PA: Manual J outdoor design conditions
| Winter design dry bulb (99 %) | 10.4 °F |
| Summer design dry bulb (1 %) | 85.8 °F |
| Coincident wet bulb (1 %) | 70.7 °F |
| Daily range class | M |
| Grains difference (75 °F, 50 % RH indoor) | +26 gr/lb |
| Elevation | 1,253 ft |
ASHRAE Handbook method (2025 edition) at Pittsburgh-Allegheny County Ap (WMO 725205), the nearest station with a recent record to the city centre. A different address in the area can use a different station: look it up below.
What these numbers mean for a house in Pittsburgh
Heating equipment and heat pumps in Pittsburgh are sized for an outdoor temperature of 10.4 °F: colder than that for only about 88 hours in a typical year. Cooling is sized for 85.8 °F with a coincident wet bulb of 70.7 °F. The daily range is medium (15 to 25 °F), which sets the Manual J cooling-load factors, and a grains difference of +26 gr/lb drives the latent (moisture) load. With indoor design temperatures of 70 °F heating and 75 °F cooling, the design temperature differences are 59.6 °F and 10.8 °F.
Look up an exact address
Nearby cities
Cleveland · Columbus · Buffalo · Washington · Baltimore · Detroit · all 50 cities
For a whole-building energy model, the same site gets hourly EnergyPlus weather files (EPW) with design days: typical year, actual years and future climate.
Frequently asked questions
What is the Manual J winter design temperature for Pittsburgh, PA?
10.4 °F: the 99 % heating dry bulb by the ASHRAE method at Pittsburgh-Allegheny County Ap.
What is the Manual J summer design temperature for Pittsburgh, PA?
85.8 °F dry bulb (1 %) with a coincident wet bulb of 70.7 °F.
Which daily range class does Pittsburgh use?
Class M: medium (15 to 25 °F).
Can I get the values for my exact address?
Yes: type the address in the lookup on this page. A one-page PDF for the permit or rebate file costs 1 credit.
Need the PDF for the file?
Free to try, no credit card.
Open the Manual J tool →