225 CMR, § 23, § C301Download PDFCurrent through Register 1538, January 3, 2025Section C301 - CLIMATE ZONESC301 Replace Section C301 as follows:C301.1GENERAL. Massachusetts is in climate zone 5A.225 CMR, § 23, § C301Adopted by Mass Register Issue 1485, eff. 12/23/2022.