About: http://webisa.webdatacommons.org/15722237

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	That means that celcius - lasttemp will be equal to 0 every time. 0 is between -0.2 and 0.2, so how can you expect anything other than the if statement always being true?
http://www.w3.org/ns/prov#wasQuotedFrom	arduino.cc