I am sceptical of this thermometer works properly. I've moved it from inside to outside in the current Canberra winter and it didn't move much and it changed temps VERY SLOWLY. It's definitely colder outdoors in the middle of Canberra then indoors. It never drops below 9deg in my house even though I don't use heating and I can see my breath when I exhale. I'm going to suggest mine does not work properly after conducting these experiments.