Icy Calling( Frostburn, p. 48)
Your summon spells work better in the frostfell if you summon native creatures.
Snowcasting (Fr) , CON 13,
In cold areas (temperature at or below 40Â° F), creatures native to cold environments and creatures with the cold subtype summoned by you are more powerful and agile than normal. The summoned creatures gain a +4 enhancement bonus to Strength and Dexterity for the duration of the spell that summoned them. In areas of extreme cold (below -20Â° F), any summoned creature affected by this feat has maximum hit points when summoned.