Date       Time  Type         freeair_tmp surface_tmp

2009-01-23 19:38   +0 hours      15.7        17.6
2009-01-23 20:38   +1 hour       15.4        16.0
2009-01-23 21:38   +2 hours      14.9        14.8
2009-01-23 22:38   +3 hours      14.4        13.7