A method can include: hot milling a mixture comprising calcium sulfate dihydrate and about 5% to about 25% sucrose by weight of the calcium sulfate dihydrate at a temperature of about 150° F. (66° C.) to about 250° F. (121° C.) to produce a climate stabilizing accelerator (CSA). The CSA produced from this method is dispersed in water and optionally aged for at least 1 minute before use in forming gypsum-fiber composite boards.