Author(s), and

dataset

Average near-surface air temperature in ˚C

Polygons

Equation (36)

NH

SH

Δ(NH-SH)

Earth

NH

SH

Δ(NH-SH)

Earth

Dove [ 19 ], Do1852

14.9

11.8

3.1

13.3

15.3

14.3

1.0

14.8

Forbes [ 23 ], Fo1859

14.9

11.8

3.1

13.4

15.4

14.1

1.3

14.8

Ferrel [ 12 ], Fe1877

14.8

15.4

−0.6

15.1

15.2

15.9

−0.7

15.5

Spitaler [ 10 ], Sp1885

“Complete dataset”

15.2

14.6

0.6

14.9

15.2

14.7

0.5

14.9

Spitaler [ 10 ], Sp1885

“Reduced dataset”

14.7

14.1

0.6

14.4

15.2

14.7

0.5

15.0

Batchelder [ 11 ],

Ba1894

14.7

13.3

1.4

14.0

15.2

14.0

1.2

14.6

Arrhenius [ 26 ],

A1896-1

15.0

13.5

1.5

14.2

15.2

13.7

1.5

14.4

Arrhenius [ 14 , 26 ]*,

A1896-2

13.7

13.0

0.7

13.3

13.8

13.2

0.6

13.5

von Bezold [ 7 ],

vB1901-1

“Spitaler”

15.3

14.4

0.9

14.9

15.0

14.1

0.9

14.6

von Bezold [ 7 ],

vB1901-2

“Batchelder”

15.4

14.4

1.0

14.9

15.1

14.0

1.1

14.6

Hopfner [ 33 ],

Ho1906-1

14.9

13.2

1.7

14.1

15.4

13.6

1.8

14.5

Hopfner [ 33 ]

Ho1906-2

15.0

13.7

1.3

14.4

15.5

14.1

1.4

14.8

von Hann [ 32 ],

vH1908

14.8

13.6

1.2

14.2

15.2

14.2

1.0

14.7