The US Was Much Hotter In The Past

We have been bombarded this week with claims that the last 12 months were the hottest on record in the US. I can’t verify that claim yet, but I did calculate the same metric through the end of 2011.

The table below shows the top 25 hottest twelve month periods in the USHCN daily raw temperature database, through the end of 2011, which is the last date available. Records only get counted if they have valid data for the previous 12 consecutive months.

All of the 25  hottest twelve month periods occurred before 1936, except for one in 1998.

Month   Year    12 Month Average Temperature
1	1885	55.778
11	1934	55.4316
12	1884	55.3907
8	1934	55.3385
11	1884	55.3222
10	1884	55.2937
3	1935	55.2907
2	1885	55.2879
12	1921	55.2135
7	1934	55.2126
10	1934	55.1559
12	1934	55.1296
11	1921	55.1279
12	1931	55.1152
1	1932	55.1064
5	1934	55.1029
3	1885	55.0813
2	1935	55.071
6	1934	55.0658
2	1932	55.0404
9	1934	55.0215
12	1998	55.0111
5	1932	54.9886
9	1921	54.9852
4	1935	54.9837

About stevengoddard

Just having fun
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2 Responses to The US Was Much Hotter In The Past

  1. David says:

    The table below shows the top 25 hottest twelve month periods in the USHCN daily raw temperature database, through the end of 2011, which is the last date available.
    ———————————————-
    If the table shows “12 month periods, what is the row on the left under “month”?

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