the output of the LM35 is influenced by various effects:
- inaccuracy of the internal parts
- other non-ideal properties of the internal circuit of the LM35
- incoming heat radiation
- outgoing heat radiation
- heat convection
- heat conduction
- self heating
- maybe others that i forgot or dont know...
if u have a strong heat source (like an open fire), the range of the LM35 might b some meters...
But normally influences #5 and #6 should b the most important... and that range is just the surface... zero meters i would say...
maybe influence #5 can have some range, if the air stream comes from some distance...