I started the hobby in and around 2008. I've had 3 different station models. At night in calm conditions I can be 4-8 degrees lower than surrounding stations (wunderground). If there's a slight breeze or cloudy conditions I'm right on. Their algorithm was removing me from the map at night at one point. I emailed them (2-3 times) this fact and they have stopped removing me. Now I have a ""Goldstar" status. This has been an issue with all of the brands. Daytime temps are right on no problem with radiation or anything. This is the backyard.
In the front of the house I have 2 different older models of indoor/outdoor thermometer units. They are more in line at night with the surrounding weather stations.
Right now my backyard station is reading 2 degrees. An older backyard station is at 4. A mile away a station is 6. The guy across town is at 9. My front porch units say 9.
I dont want to name the brands because I don't want to start a war over that.
I will tack it up to an anomaly or maybe i have ghosts in my backyard.
I guess I'm soliciting opinions or thoughts or maybe someone else has seen this.
thank you