the ranges are : very cold ( -200 to -100 c , -392 to -212 f ) , cold ( -100 to 0 c , -212 to 32 f ) , moderate ( 0 to 20 c , 32 to 68 f ) , hot ( 20 to 200 c , 68 to 392 f ) , and very hot ( 200 to 600 c , 392 to 1,112 f ) .