How are these Air conditioning voltage numbers?

My new TT has a 15K BTU A/C. I can reach my garage plug which is on a 15 amp breaker with the TT 30 amp cord and a 10'' pigtail 15 amp adapter. If nothing else in the garage is running, the camper A/C seems to run fine. I checked the voltage at the camper plugs and got 112.5 volts after a minute or so with the A/C on. 5 or more minutes later I checked voltage at the camper plugs I had 109.3 volts. I let the A/C run some more and did not check further voltage before I shut it off. My question is how do these numbers look? Will my A/C be fine if I ran it during the night if I wanted to? Should I check voltage more the longer the unit runs?

I am aware of the danger to A/C compressor debate, I just don't know where the danger zone is voltage wise. I do plan on installing a dedicated 30 amp plug in the future.