In general, any thermometer with an open view of the sky is going to have accuracy problems on those clear, calm nights, so the “regular” thermometer also is inaccurate if it doesn’t have shielding. Here’s what I do for shielding on mine (mylar around a PVC pipe that has a rain cover allowing air flow), but this is also intentionally mounted lower than an official weather station because I want to know what the cold air is like pooling around the base of my trees:
1 Like