You would think hot weather should be arriving to Spain now. That heat should kill off the virus outside of buildings.
I guess we will find out soon if Hot Sunny weather kills the virus or not.
We also need to see what summer sun does to people’s Vitamin D and C levels. A lower illness rate may not be directly due to hot/sunny weather at all. Only the indirect cause of creating Vitamin D on people’s skin or producing food with high levels of Vitamin C.