I think I have almost figured out how to change the intervals and time of the blizzards, using coding from the MP_Blizzard scar file. So far, I was able to get it to successfully use my times, but after 1 cycle of blizzards it crashed the map to desktop. I'll post some coding after work.
EDIT: After a few tries, I was unsuccessful at getting it to work. The coding I was trying was doubling the blizzard rotation, in effect having two simultaneous blizzards, one at the times I set, and one at the default times. 
I haven't been able to define these variables in the scar file. These were pulled from blizzardmultiplayer.scar
	-- timing variables
	blizzard_interval_min 				 = t_blizzardData.blizzard_interval_min 			 	or 400	-- min seconds between blizzards
	blizzard_interval_max 				 = t_blizzardData.blizzard_interval_max 			 	or 800 -- max seconds between blizzards
	blizzard_exit_min 					 = t_blizzardData.blizzard_exit_min 				 	or 160 -- min duration  of a blizzard
	blizzard_exit_max 					 = t_blizzardData.blizzard_exit_max 		 		 	or 240 -- max duration  of a blizzard
	blizzard_transition_time 			 = t_blizzardData.blizzard_transition_time 			 	or 60				-- how long it takes to transition in or out of a blizzard
	blizzard_transition_time_out 		 = t_blizzardData.blizzard_transition_time_out		 	or 30           -- how long it takes to transition out of a blizzard
	blizzard_transition_ticks_per_second = t_blizzardData.blizzard_transition_ticks_per_second 	or 2	-- defines how smooth the gameplay transitions are