Agree and just wanted to note that cleaning the windows did help I believe, and most notably - simply opening climate, touching the "fresh air" button helps prevent fogging for me considerably. Should be obvious, but without defrost actually on, the air appears to be part fresh, part recirculating air. Fresh air is key to disbursing the humidity. And I really don't like to run defrost after the first minute or two in the car. Jerry33 please chime in
Yes; cold air, even at 100% humidity, gains a great deal of water-capacity when warmed. If it's low humidity cold air, it becomes quite ravenous, as many people's pelts (mine, e.g.) can attest. cursing: Glycerin helps, though, as it strongly latches onto water and resists evaporation, holding water on and within skin.) Even in Vancouver, with the onshore "warm" Pacific wet-erlies, gets down to 30-40°F outdoors in winter, and that air gets thirsty when centrally heated.
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When the wind blows down from the desert plateaux on the top of the Coast Range (Kamloops area), it is pre-dried, and then you can almost see water levels in glasses, cups, and pots lower as you watch! Household plants turn brown before your eyes (despite elevated indoor CO2 levels which permit them to transpire much less). Sometimes an hour or so of running a shower head on hot mist setting can drive up the hygrometer reading a few notches, but it's transient relief.