Mean Rate of Change ( °C / Century )

Since: 1760 1810 1860 1910 1960 1990
Alaska - - 1.02
± 0.34
1.03
± 0.25
3.42
± 0.19
0.65
± 0.77
United States - 0.69
± 0.24
0.80
± 0.16
0.89
± 0.08
2.36
± 0.13
2.42
± 0.39
North America - 0.82
± 0.23
1.02
± 0.18
1.11
± 0.11
2.90
± 0.19
4.72
± 0.28
Northern Hemisphere - 0.79
± 0.16
0.96
± 0.10
1.19
± 0.05
2.56
± 0.20
3.56
± 0.20
Global Land 0.43
± 0.18
0.79
± 0.13
0.91
± 0.08
1.11
± 0.03
2.16
± 0.11
2.78
± 0.13

Regional Climate Variability

Difference from Global Land Average ( °C, 95% range )

Smoothing Monthly Annual Five-year Ten-year Twenty-year
± 3.89 ± 1.43 ± 0.76 ± 0.52 ± 0.40

Correlation to Global Land Average (R value)

Smoothing Monthly Annual Five-year Ten-year Twenty-year
0.32 0.63 0.82 0.90 0.92

Variability in Monthly Means ( °C, 95% range )

Jan Feb Mar Apr May Jun
± 6.21 ± 5.64 ± 4.53 ± 3.47 ± 2.20 ± 1.60
Jul Aug Sep Oct Nov Dec
± 1.58 ± 1.85 ± 2.17 ± 3.22 ± 4.53 ± 5.28

History of Temperature Stations

Evolution of Climate Extremes

Mean of Daily High Temperature

Mean of Daily Low Temperature