Fractions become more important with the larger Celsius intervals. Of note, the Climod site shows daily temps with whole degrees (F) but with .5 means where appropriate, and the norms/departures are to the tenths. Last time I got data from UCC, their temps went to the tenths. However, their snow depth would sometimes get weird, as if their system abhorred whole numbers - rarely was there a 5.0" event, as it would be listed as 4.99 or 4.98, less commonly 5.01.