Graph below overlays NCDC US temperatures (blue) on the 1999 GISS version (red.)
Climate at a Glance | Time Series
Perhaps Enron accountants found new jobs?
Disrupting the Borg is expensive and time consuming!
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1934 and 1998 were both unusually warm “peak” temperature years. I see that you’ve aligned the 1998 peaks exactly. The difference between the two 1934 peaks is 0.65 °C.
In other words, since 1999 they’ve warmed 1998 and/or cooled 1934 by a total of 0.65 °C. In the 1999 version of the data, 1934 was 0.54 °C warmer than 1998. But in the current version 1934 is 0.1054 °C cooler than 1998.
1999 version 2013 version 1934 1.46 1.2217 °C 1998 0.92 1.3271 °C -------- -------- 0.54 -0.1054 °CNote that both sets of numbers are based on the same measurements. The changes are due to subsequent adjustments by NCDC and/or GISS.
Most of the adjustments are unexplained. I tried to get an explanation of the adjustments from the CSRRT, but they didn’t know.