There is warm moist air that comes into contact with the cooler glass surface. If you can run your A/C and a run a fan near the windshield that might help reduce the condensation. I just get a towel and a squeegee to clear the glass and keep on moving down the road.
Ed & Robin Lively
with Nina, Kitt, and Mickey
2016 Thor Synergy TT24 (a.k.a "Ming")