(going off on a bit of a tangent in case this helps people in the future...)
shipped in >90F weather last year, ground, took 2 days, and we managed a medal and almost two more.
also, before anyone pays for 2-day, make sure it will take longer than two days to use ground. our packages make it from KS to Michigan, Pennsylvania, and most of the country in 2 days. The price difference between actual "2-day" and ground that takes two days (sent Tuesday, out for delivery today) was $96 vs $25 in my case. ($48 vs $12.65 x 2 boxes)
The last time I used 2-day for anything it actually arrived in one day and then sat at FedEx for a day because "delivery not scheduled"