I've noticed that my side by side refrigerator's temperature varies up to 10 degrees or more at times. I use a dial temp gauge which sits in the same area to observe this. I notice no pattern as to when it happens (though I'm watching more closely now). The door can be closed for several hours prior to seeing the high temp. Usual temp is ~34-36 deg and I'll see it spike up to 42 deg or more.
I realize this may be due to the defrost cycle, so my question is; how much temperature variation, and for what duration, should I consider normal, before becoming concerned.
Thanks in advance for any help.