You get 4 seasons...and I never understood what that meant until I got out of AZ....where you get Warm and Hot.
We are having a "heat wave" right now....and that means mid-high 90's for a couple weeks. No humidity, and it still cools down into the low 60's at night.
Winter- Dec-Feb... Not much snow...maybe a couple times a year. Cold, but you put on a jacket!
Spring - March -May...Absolutely beautiful. In the 70's through May! So much to do outdoors.
Summer - June-August - Hot, but not unbearable. High 90's...maybe crack 100 once or twice...but its not a giant concrete slab like Phoenix...so it actually cools down in the morning and at night.
Fall - Sept-Nov - Super fun time here. Lots of harvest stuff, cool crisp weather. You're wearing a jacket on Halloween, but in AZ your be sweating.
Honestly, I love it. I think back to HS football practice in Tempe...in 120 degrees...with navy blue helmets...and I honestly wonder how we didnt drop dead. When I go visit my mom in the summer, I have to buy a room AC from walmart just to sleep....In Boise, I open my windows and get fresh air.
I didn't think weather would be such a factor for me until I got out of AZ and realized how bad it is. If you can snowbird in AZ and be out by March...then great. If you are looking to live somewhere full time I think you will find that Phoenix is not what its made out to be.