The Past Keeps Getting Cooler

NOT A LOT OF PEOPLE KNOW THAT

By Paul Homewood

h/t Eliza

Corn-belt-JJA-temperature-precip-1895-2013-diff-in-datasets

Roy Spencer has spotted another example of how the past keeps getting miraculously cooler.

I was updating a U.S. Corn Belt summer temperature and precipitation dataset from the NCDC website, and all of a sudden the no-warming-trend-since-1900 turned into a significant warming trend. (Clarification: the new warming trend for 1900-2013 is still not significantly different from zero at the 90% confidence level. H/T, Pat Michaels)

As can be seen in the following chart, the largest adjustments were to earlier years in the dataset, which were made colder. The change in the linear trend goes from 0.2 deg F/century to 0.6 deg. F/century.

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