We just arrived at our home in Ohio after spending the last 2 1/2 months in Phoenix, AZ. We returned home via Interstates 70 and 80. We went up thru northern AZ, as we wanted to see Monument valley, and Arches NP. Although we normally take IS 40 thru to Oklahoma City, then IS 44 to St Louis, and finally IS 70 to Ohio....we elected to go further north to see the previously mentioned sights. We were a little concerned about weather issues as well, but encountered none! Lots of snow still on the ground in the Colorado Rockies, but the roads were dry. What a beautiful sight seeing the skiers in Vail going down the slopes! This time of year can still bring heavy snows to the Rockies, but the weather will warm up in 24 hours and bring good driving conditions back quickly. We have been going to Phoenix for quite a long time via the Interstate 40 route, and rarely encounter weather problems this time of year. Even if you do, just pull into a campground and sit for a day....the conditions improve quickly this time of year. Whatever route you choose, have a safe and enjoyable trip!