100 is normal here for July and August, but it started in May before lily season starts here and just keeps getting worse. It was a record setting June here, and it was a record setting May in Alaska, which is currently on fire. There is just about ZERO humidity (NO dew) and usually NO breeze, makes for some very weak stems. We are rather windy this season, makes the wildfires burn better and blows the smoke right to me.
When I first came here it was unusually cold and wet in the spring and summer, tolerable for me. And my precious and expensive VooDoo and Cobra lilies were in pots and did fine, now most are dead. Some came up this "spring" and promptly keeled over. Some are just now coming up and all have some shade, they are just reluctant to emerge into this hell on earth, happened this way ever since I got a yard to put them into.
So my short list of what did WELL in 100 degrees or damn near every day is Momentous, Lankon, Santa Rosa (no pink in heat), Fata Morgana (the only double I have that stays double here), Chaiten, Blood Tiger, Black Spider, L. henryi, Royal Sunset, and Red Velvet. Everything else including trumpets and OT's has fried, some have died or the blooms burn off the same day they opened. The ones that get shade or part shade are OK. But due to the "spring" weather typical here (1 week of winter, then one week of summer and repeat over and over and over again) there are many aborted or deformed flower buds. And most of them are stunted due to the heat hitting early. The Martagons that bloomed early were fine, but now the leaves are burning and many aborted buds since it was too hot too soon.
I will be planting more trees when the weather allows me to!