Anything less than a 40hr heat pack will end up causing snake to freeze. Ive tested 40 hour heat packs in 82F room and surface temp never exceeded 115F. And being in a Plane which is winter up at 35k feet will keep box roughly in the 50F.

I just shipped a snake from Michigan(low 53) to Texas(low70) with 40 hour heat pack, snake didnt over heat but arrived Cool.

your shipment from CT to CA depends on over night lows not highs. Since i ship hub to hub i never pay attention to the highs as their never exposed to them.