Walter Dnes (WUWT) examined American temperature “adjustment” by the USHCN (United States Historical Climate Network), and found that said adjustments were not just annual, but monthly as well (i.e., different months were “adjusted” differently).
Among his more interesting findings…
- Winter months were adjusted upward more so than summer months, since 1970 (it’s quite possible their could have been a correlation between average monthly temperature and adjustment, but Dnes didn’t examine that). Dnes noted that “talk about winters in the USA getting warmer may be an artifact of the adjustments.”
- Since 1970, the adjustment slope in annual terms is over 1 degree Celsius. In other words, when anyone talks about warming over the last forty-plus years, 1C of it comes from humans alright – human manipulation of the data
- Annual adjustment for the 1930s (the decade the gave us the Dust Bowl and the most massive dust storm in American history), were over half a degree Celsius downward. As Dnes notes, “one wonders if this an attempt to disappear the heat waves and droughts of ‘The Dirty Thirties’ in a manner similar to attempts to disappear the Medieval Warm Period. It’s hard to talk about ‘the hottest ever’, when there’s ‘inconvenient data’ around, showing that the 1930s were hotter.”
- Since 1970, the number of actual data points for temperature has fallen. In fact, we have 20% fewer raw data points today than in 1970. Yet final data points are unchanged, meaning there’s quite a bit of estimated data, a problem I’ve discussed earlier.
- From about 1895 to 1930, “final” data points are well above raw data points (in 1896, the raw data points were about half the number of final data points
Cross-posted to the right-wing liberal