i lived through this. it was june 30 and the temp for the week was from the high 90s to the low 100s. i had 8 inches of ice in my yard and it was still 90 degrees.

the news told us it was a piece of 'high altitude ice' whatever tf that means. weather has been getting weird for quite a few years now

https://lasvegassun.com/news/2016/jun/30/severe-thunderstorm-warning-issued/