This week we have had cold windy weather, but almost unheard of low humidity levels (hope we can get them in August!) I've had 3 soaks of at least 20 minutes at night with less than 20% humidity. The only other time I have sen lower humidity here it was -23F. Today the water was down 2" this week, so the dry air really does suck the water out fast, this is an unusual amount for me to lose.