1880-2021
+0.0702°C/decade
(+0.1264°F/decade)
May 1906 - Apr 1946
+0.1366°C/decade
(+0.2459°F/decade)
Sep 1951 - Apr 1976
-0.0394°C/decade
(-0.0710°F/decade)
Dec 1974 - May 2018
+0.1807°C/decade
(+0.3253°F/decade)
Good Analysis (Colored Lines): Uses proper linear regression over scientifically meaningful periods.
Bad Analysis (Black Dashed Lines): Cherry-picked slopes: +0.1600°C, -0.1342°C, +0.1815°C per decade.
The bad analysis demonstrates how misleading results can be obtained through poor methodology.