Weather, lol, all I can say is dusty! But that won't last.
Its pretty warm through the day here, but cool over night.
Wiggles, Hi 5...anything like that! If she sleeps in the morning great, but on our long trips Jesse used to scream continuously once it got dark. Usually the last 2 - 3 hours were spent stopping & starting, trying to make him happy. In car DVD player sorted that this time.
Have a box of toys next to her that she can reach easily. Maybe even some crayons & paper...but careful she doesn't eat them, lol!
Stop as often as you think she needs to. She might be ok in the car, she might want an hour break every 2 hours!
Lollipops....sticky, but keep them quiet for a while! Don't do banana's or lamingtons...oh, or chips! Still gotta deal with that in my car!
Goodluck!!