I'm migrating from Phoenix, Arizona to Goshen, Indiana. We've made the drive numerous times in early and late summer. (A three day trip hauling our teardrop trailer.) This time, we anticipate driving in early spring, when weather varies from sunshine/40 degrees to blizzard conditions.
We've plotted a southerly route that largely avoids the mountains and the coldest states. However, when I originally drove to Arizona from Philadelphia, I hit snow in Amarillo during April.