from everything ive ever read/been told/ absorbed over the years involved in cars, the goal is to heat it up to optimum temp asap, ie 82 degrees, to minimise the cold temp damage/wear.
then simply maintain that.
looks like it's doing that already?
if anything, during winter, run a hotter, or later opening thermostat, especially if you only use the car for short trips.
i think i used to get a 87, or something?
but yeah going by your OP, car is fine?
my 2c, mate