While the region in general is not cold enough to support snow, Elsa's snow and ice will remain where it was spread, the temperature surrounding the immediate space gradually dropping to accommodate the closer one gets to the border of the snow/ice itself.

TC would leave her the hell alone. Deckard would /try/ to help but quickly realize he can't...and about as quickly see Lea come over to help deal with her. He won't interfere with that, though he'll remain concerned. (LOL he'll probably leave with a frozen foot for his efforts at helping or something XD)