Thermostat Operation

I have a 70 dart with '68 340 block bored .040 over with mild cam. Timing is set at 18* initial and 36* total. I have a 22" radiator re cored to a 3 row, 7 blade mopar fan with Jag clutch and shroud.

I have a 195* thermostat and was wondering about the operation. I realize this may be a dumb question, but at what temperature does it close? I understand that it opens at 195*

The main reason I ask, is because I think mine may be faulty.

I can start my car and watch it come up to temp, which usually takes 10 minutes or so, just idling, which I feel is normal. The temp will rise to about 195* and the thermostat will open, and the temp will fall to just over 180* or so. This all makes sense to me.

Now after the thermostat has opened the first time, the temp will rise to 205* and stay there while cruising and go to about 210* at stop lights.

I have been told that these temps are fine and not to be concerned, but was just wondering if my thermostat isn't closing after the temp lowers and then re opening when it gets back to 195*

Or is this not how it works?

Thanks and I apologize for the dumb question. I couldn't find anything online about the "Closed temperature" just the open.