Only place I've ever seen the "grass" melt

Florida feel hotter because of the humidity and keeps hot at night. Idk about Vegas but southern AZ gets super cold at night in the winter. We've even had snow!

Humidity makes a huge difference. Arizona runs hotter than Florida, but Florida is so humid it can feel oppressive

Good option!

Valid seasonal starting point. According to the Sages as Starbucks it looks like fall starts on August 26th

Exactly. Enjoy the last summer bits and celebrate the first fall ones.

Same. I had to spell check it 100 times to even write it

These are all the holidays (sabbats) in the Wheel of the Year. Instead of breaking the 12 months into four seasons of uneven length based on the calendar it instead breaks the year into 8 approximate 6-week intervals that are based on the solaces and equinoxes. So Lughnasadh occurred on August 1 which means we have hit the middle point between the summer solstice and the autumn equinox. So we are in the fall half of summer. Once we hit the autumn equinox (Mabon) we have 6 weeks of fall, before we hit Samhain on Halloween where we move to the winter part of fall. Its a much better way to think about seasons

You can look up the dates online or read the wonderful series on Sabbats by Llewellyn