If you are worried about weather tolerance, I would be more concerned with warm weather rather than cold. Dogs normal temp is quite a bit higher than humans. They can take the cold, especially when running.
The heat is another matter altogether. I'd think about something with short hair and smaller. Mass matters! Smaller dogs can handle heat better.
A Braque Francais would be good, especially in the house. I have a Brittany currently and he gets a good hair cut 2-4x per summer. Quite a bit more active in the house but manageable. Vizsla would be good, especially for covering ground out West. I am sure there are others.