[Ed. – Be sure to click through on the links at this Climate Depot post. The Bureau of Meteorology spokespeople have plausible-sounding answers for everything, but as the Aussie bloodhounds point out, the story has kept changing as to why lower temperature readings were being filtered out, but higher ones weren’t. The quick fix of removing “smart cards” from affected monitoring sites promptly resulted in lower temp readings remaining unfiltered. Sounds systematic, warranting an investigation. Oh — and it’s winter Down Under.]
Recorded temperatures at the Bureau of Meteorology’s Thredbo Top automatic weather station have dropped below -10C in the past week, after action was taken to make the facility “fit for purpose”.
A record of the Thredbo Top station for 3am on Wednesday shows a temperature reading of -10.6C. This compares with the BoM’s monthly highlights for June and July, both showing a low of -9.6C.
The BoM said it had taken immediate action to replace the Thredbo station after concerns were raised that very low temperatures were not making it onto the official record. Controversy has dogged the bureau’s automatic weather station network since Goulburn man Lance Pigeon saw a -10.4C reading on the BoM’s website on July 2 automatically adjust to -10C, then disappear.
Later independent monitoring of the Thredbo Top station by scientist Jennifer Marohasy showed a recording of -10.6C vanish from the record.