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IECC 2021 · PNNL

Michigan climate zones

Michigan’s 83 counties fall in 3 IECC 2021 climate zones: 5A (37), 6A (44), 7 (2).

Zone 5A: cool-humid

Attic target R60 (ENERGY STAR)

Allegan County (Cold) · Barry County (Cold) · Bay County (Cold) · Berrien County (Cold) · Branch County (Cold) · Calhoun County (Cold) · Cass County (Cold) · Clinton County (Cold) · Eaton County (Cold) · Genesee County (Cold) · Gratiot County (Cold) · Hillsdale County (Cold) · Huron County (Cold) · Ingham County (Cold) · Ionia County (Cold) · Jackson County (Cold) · Kalamazoo County (Cold) · Kent County (Cold) · Lapeer County (Cold) · Lenawee County (Cold) · Livingston County (Cold) · Macomb County (Cold) · Midland County (Cold) · Monroe County (Cold) · Montcalm County (Cold) · Muskegon County (Cold) · Oakland County (Cold) · Ottawa County (Cold) · Saginaw County (Cold) · Sanilac County (Cold) · Shiawassee County (Cold) · St. Clair County (Cold) · St. Joseph County (Cold) · Tuscola County (Cold) · Van Buren County (Cold) · Washtenaw County (Cold) · Wayne County (Cold)

Zone 6A: cold-humid

Attic target R60 (ENERGY STAR)

Alcona County (Cold) · Alger County (Cold) · Alpena County (Cold) · Antrim County (Cold) · Arenac County (Cold) · Baraga County (Cold) · Benzie County (Cold) · Charlevoix County (Cold) · Cheboygan County (Cold) · Chippewa County (Cold) · Clare County (Cold) · Crawford County (Cold) · Delta County (Cold) · Dickinson County (Cold) · Emmet County (Cold) · Gladwin County (Cold) · Gogebic County (Cold) · Grand Traverse County (Cold) · Houghton County (Cold) · Iosco County (Cold) · Iron County (Cold) · Isabella County (Cold) · Kalkaska County (Cold) · Lake County (Cold) · Leelanau County (Cold) · Luce County (Cold) · Mackinac County (Cold) · Manistee County (Cold) · Mason County (Cold) · Mecosta County (Cold) · Menominee County (Cold) · Missaukee County (Cold) · Montmorency County (Cold) · Newaygo County (Cold) · Oceana County (Cold) · Ogemaw County (Cold) · Ontonagon County (Cold) · Osceola County (Cold) · Oscoda County (Cold) · Otsego County (Cold) · Presque Isle County (Cold) · Roscommon County (Cold) · Schoolcraft County (Cold) · Wexford County (Cold)

Zone 7: very cold

Attic target R60 (ENERGY STAR)

Keweenaw County (Very cold) · Marquette County (Very cold)