I also have a pair of the tall Minnetonka Moccasin boots .
I wear them a lot in the winter with a pair of knee high
thick wool socks. This combo is VERY warm.

In the summer I only wear them when my legs need
protection from briars etc. In this case I wear ankle
high socks, and my legs stay quite cool. If it is really
hot, the leather gets wet from sweat and my legs
actually feel cooler than when wearing sneakers.