“Dial “M” for mangled – Wikipedia and Environment Canada caught with temperature data errors.” Anthony Watts finds another report of cherry-picked errors in raw airport temperature data again, this time by “Ecotretas” about the Canadian High Arctic community of Eureka, Nunavut. Darn those human beings and their inconsistent data entry! Or those malfunctioning gadgets! Or maybe those trucks running right beside the thermometer! Or something.

These kinds of data quality errors are corrected before being used in climate modeling. Hence irrelevant to the Global Warming debate. Anthony almost figures it out here (italics mine):

[Here is where it really gets strange, I’ve added two screencaps from Environment Canada, on for the monthly data, another for the daily data from July 14th, 2009. They don’t match! The 20.9C value never appears in the July 14th hourly data. Click images below to enlarge, EC’s July 2009 Monthly report on the left, July 14th, 2009 daily/hourly data on the right. Perhaps EC corrected the error in the daily/hourly data, but missed the monthly?  – Anthony]

Also, as a geologist and a Canadian, I always laugh when people like Anthony get confused by map projections. According to him the Eureka airport data is “responsible for the very big stripe on the very top of Canada.” Um, no. It looks that way because the Earth is being represented using the cylindrical Mercator projection method, which distorts (magnifies) polar regions.