Obscure reference I’ll admit – if my few remaining neurons are firing correctly comes from time spent at law school but the reference also applies to science, most of the more vocal proponents of both sides of the Anthropogenic Global warming debate rely on summarized and ‘corrected’ data.
When it comes to surface temperature measurements, your measurements are only as good as the device used and how closely the procedure followed.
These are the original sources
Anthony Watts over at NorCal blogs has started a program to survey reporting surface stations and document the existing conditions and has created a bit of a buzz, take a look at his series on how not to measure temperature
