HadCRUT3: 2011 was 12th warmest year

The dataset produced at the center of the Climategate scandals, HadCRUT3 (weather stations), differs from UAH AMSU (satellites), RSS AMSU (satellites), and GISS (weather stations).

If you click at the previous links, you will see that unusual coalitions have developed: both GISS (weather stations) and UAH AMSU (satellites) saw 2011 as the 9th warmest year while both HadCRUT3 (weather stations) and RSS AMSU (satellites) decided that the right climate ranking for the previous year was at the 12th spot.




In some more detail, HadCRUT3 classifies 162 years, 1850-2011. Among them, as you can calculate, the hitparade looks like this:

1. {1998, 0.548}, 
2. {2005, 0.482}, 
3. {2010, 0.478}, 
4. {2003, 0.475}, 
5. {2002, 0.465}, 
6. {2004, 0.447}, 
7. {2009, 0.443}, 
8. {2006, 0.425}, 
9. {2001, 0.408}, 
10. {2007, 0.402}, 
11. {1997, 0.352}, 
12. {2011, 0.340}, 
13. {2008, 0.325}, 
14. {1999, 0.297}, 
15. {1995, 0.275}, 
16. {2000, 0.270}, 
17. {1990, 0.255}, 
18. {1991, 0.213}, 
19. {1988, 0.180}, 
20. {1987, 0.179}, 
21. {1983, 0.177}, 
22. {1994, 0.172}, 
23. {1996, 0.137}, 
24. {1944, 0.121}, 
25. {1981, 0.120}, 
26. {1993, 0.106}, 
27. {1989, 0.102}, 
28. {1941, 0.078}, 
29. {1973, 0.077}, 
30. {1980, 0.076}, 
31. {1992, 0.062}, 
32. {1979, 0.049}, 
33. {1986, 0.030}, 
34. {1878, 0.028}, 
35. {1940, 0.02}, 
36. {1977, 0.017}, 
37. {1982, 0.01}, 
38. {1938, 0.009}, 
39. {1963, 0.002}, 
40. {1939, 0.001}, 
41. {1945, -0.007},

The temperature anomalies are expressed in Celsius degrees.

Here are the trends in °C/century obtained from linear regression of the annual mean temperature anomalies for the periods YYYY-2011 where YYYY (the "from" year) is listed below. Note that for the very short periods (i.e. YYYY close to 2011), we get numbers with huge absolute values because most of the "trend" is due to indisputable "noise".

• {2010, -13.8}, 
• {2009, -5.15}, 
• {2008, 0.8}, 
• {2007, 0.29}, 
• {2006, -0.23}, 
• {2005, -1.}, 
• {2004, -0.94}, 
• {2003, -1.04}, 
• {2002, -0.98}, 
• {2001, -0.64}, 
• {2000, 0.11}, 
• {1999, 0.47}, 
• {1998, -0.04}, 
• {1997, 0.13}, 
• {1996, 0.71}, 
• {1995, 0.82}, 
• {1994, 1.07}, 
• {1993, 1.33}, 
• {1992, 1.57}, 
• {1991, 1.53}, 
• {1990, 1.43}, 
• {1989, 1.5}, 
• {1988, 1.47}, 
• {1987, 1.43}, 
• {1986, 1.51}, 
• {1985, 1.62}, 
• {1984, 1.68}, 
• {1983, 1.58}, 
• {1982, 1.6}, 
• {1981, 1.54}, 
• {1980, 1.51}, 
• {1979, 1.48}, 
• {1978, 1.52}, 
• {1977, 1.5}, 
• {1976, 1.59}, 
• {1975, 1.64}, 
• {1974, 1.68}, 
• {1973, 1.6}, 
• {1972, 1.58}, 
• {1971, 1.6}, 
• {1970, 1.57}, 
• {1969, 1.52}, 
• {1968, 1.52}, 
• {1967, 1.51}, 
• {1966, 1.5}, 
• {1965, 1.5}, 
• {1964, 1.52}, 
• {1963, 1.46}, 
• {1962, 1.41}, 
• {1961, 1.36}, 
• {1960, 1.34}, 
• {1959, 1.31}, 
• {1958, 1.26}, 
• {1957, 1.23}, 
• {1956, 1.25}, 
• {1955, 1.26}, 
• {1954, 1.25}, 
• {1953, 1.21}, 
• {1952, 1.18}, 
• {1951, 1.16}, 
• {1950, 1.16}, 
• {1949, 1.15}, 
• {1948, 1.14}, 
• {1947, 1.12}, 
• {1946, 1.11}, 
• {1945, 1.07}, 
• {1944, 1.01}, 
• {1943, 0.98}, 
• {1942, 0.95}, 
• {1941, 0.91}, 
• {1940, 0.87}, 
• {1939, 0.84}, 
• {1938, 0.82}, 
• {1937, 0.79}, 
• {1936, 0.78}, 
• {1935, 0.78}, 
• {1934, 0.77}, 
• {1933, 0.77}, 
• {1932, 0.76}, 
• {1931, 0.75}, 
• {1930, 0.74}, 
• {1929, 0.74}, 
• {1928, 0.74}, 
• {1927, 0.74}, 
• {1926, 0.73}, 
• {1925, 0.73}, 
• {1924, 0.73}, 
• {1923, 0.73}, 
• {1922, 0.74}, 
• {1921, 0.73}, 
• {1920, 0.73}, 
• {1919, 0.73}, 
• {1918, 0.73}, 
• {1917, 0.74}, 
• {1916, 0.75}, 
• {1915, 0.74}, 
• {1914, 0.73}, 
• {1913, 0.74}, 
• {1912, 0.74}, 
• {1911, 0.75}, 
• {1910, 0.76}, 
• {1909, 0.77}, 
• {1908, 0.77}, 
• {1907, 0.77}, 
• {1906, 0.77}, 
• {1905, 0.76}, 
• {1904, 0.77}, 
• {1903, 0.77}, 
• {1902, 0.77}, 
• {1901, 0.76}, 
• {1900, 0.74}, 
• {1899, 0.73}, 
• {1898, 0.73}, 
• {1897, 0.72}, 
• {1896, 0.71}, 
• {1895, 0.7}, 
• {1894, 0.7}, 
• {1893, 0.7}, 
• {1892, 0.7}, 
• {1891, 0.69}, 
• {1890, 0.69}, 
• {1889, 0.68}, 
• {1888, 0.67}, 
• {1887, 0.66}, 
• {1886, 0.65}, 
• {1885, 0.65}, 
• {1884, 0.64}, 
• {1883, 0.63}, 
• {1882, 0.62}, 
• {1881, 0.61}, 
• {1880, 0.61}, 
• {1879, 0.6}, 
• {1878, 0.58}, 
• {1877, 0.56}, 
• {1876, 0.56}, 
• {1875, 0.56}, 
• {1874, 0.55}, 
• {1873, 0.55}, 
• {1872, 0.54}, 
• {1871, 0.54}, 
• {1870, 0.53}, 
• {1869, 0.52}, 
• {1868, 0.52}, 
• {1867, 0.51}, 
• {1866, 0.5}, 
• {1865, 0.5}, 
• {1864, 0.5}, 
• {1863, 0.49}, 
• {1862, 0.49}, 
• {1861, 0.49}, 
• {1860, 0.49}, 
• {1859, 0.48}, 
• {1858, 0.48}, 
• {1857, 0.48}, 
• {1856, 0.48}, 
• {1855, 0.47}, 
• {1854, 0.47}, 
• {1853, 0.46}, 
• {1852, 0.46}, 
• {1851, 0.45}, 
• {1850, 0.45}.

I hope you have enjoyed the reading. :-) I also hope you have noticed that the trends from 1998, 2001, 2002, 2003, 2004, 2005, 2006, 2009, and 2010 have been negative. If you haven't, you must read the numbers above again (and memorize them)! :-)