Mean Rate of Change ( °C / Century )

Since: 1760 1810 1860 1910 1960 1990
California - - 0.47
± 0.26
0.99
± 0.14
1.76
± 0.13
0.83
± 0.39
Contiguous United States - 0.66
± 0.25
0.76
± 0.18
0.87
± 0.08
2.16
± 0.16
2.76
± 0.36
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
± 2.43 ± 1.00 ± 0.58 ± 0.48 ± 0.40

Correlation to Global Land Average (R value)

Smoothing Monthly Annual Five-year Ten-year Twenty-year
0.24 0.48 0.72 0.80 0.84

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

Jan Feb Mar Apr May Jun
± 2.61 ± 2.78 ± 2.75 ± 2.68 ± 2.53 ± 2.18
Jul Aug Sep Oct Nov Dec
± 1.56 ± 1.52 ± 1.94 ± 2.24 ± 2.32 ± 2.45

History of Temperature Stations

Evolution of Climate Extremes

Mean of Daily High Temperature

Mean of Daily Low Temperature