Maryland Climate Data

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

Below is a collection of Maryland Climate Data and outdoor design conditions. We included an Maryland 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 Maryland we would consider adding to the Maryland 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 Maryland Manual J taken care of.

Free Manual J

MarylandElevation 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
Andrews Air Force Base28239189174303743M1.12
Balitimore CO2439178976435056M0.8
Baltimore-Washington international airport15439179174293642M1.18
Fredrick airport31339129175344148M1.11
Lexington Park Naval Auxilary Air Station3938219076404753M0.97
Salisbury Wicomico Co. airport5938189076414754M1.11
Thomas Point3939218576505763L1.07
Maryland State Average267.111111111138.777777777816.222222222289.66666666677536.555555555643.333333333349.7777777778M1.1677777778
Maryland Climate Data
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Maryland Climate Data
Maryland Climate Data
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Email order number, PDF Plans, jobsite address, and square footage to