Maybe someone has an idea of what is going on here. Windows fog up this time of year here, and I’ve noticed a curious thing about it…When I drive south-west, the windows magically fog up by the time I’ve driven 1/3rd of a mile from my house. When I drive east, they don’t fog up until I’ve driven close to two miles. The places I’m going are an equal distance and I need to be at the location at the same time, so it’s not time of morning that accounts for the difference. The only real difference is that when I go south-west I’m going uphill, and I’m not going east. Anyone know if it’s the direction that makes the difference, or if it’s the hill?
Which direction is the prevailing wind around your place?
Condensation occurs when moist warm air on one surface of glass comes in contact with cold air on the other side of the glass. If there is a prevailing wind (cold) coming out of a specific direction, that direction will usually get foggy quicker and stay foggy longer.
Also, if you are driving into the sun, even that action can reduce window fog.