loww02

I just purchased a 2018 Silverado crew cab z71 with the 5.3 about a month ago and I have put about 1500 miles on it. This weekend I noticed when I was driving to and home from the desert that my temp would go a little over 210 while on a hill, and as soon as I would get to a less aggressive grade the temp would drop back down to 210 within seconds. The highest it has gotten was about 220, and I'm just wondering if this really is normal. I had a 2002 Silverado and it never went past 210, even when it was over 100 degrees out.