Yes engine oil and ATF temp mainly, you can have too much of a good thing. Remember in the 60's and 70's all the vehicles with cardboard in front of the radiator? I don't want to be that guy LOL.
Can only monitor down to just above zero otherwise the display on the phone I use freezes up on me. At 14° after idling and warming up, about as high as it is going to go without getting underway.
After driving through town to the store, turning off and back on and another 15 minutes in stop and go traffic. And coming up a good sized hill to the house.
That is about the lowest I care to go and when it is actually cold I'm sure it is a good bit lower. I run the ATF warmer bypass unpinned in the winter and the Hayden has a Tstat as well. OEM radiator with Hayden tranny cooler is about perfect, for me. If I lived further South I would absolutely consider the CSF.