Mean Rate of Change ( °C / Century )

Since: 1760 1810 1860 1910 1960 1990
Pennsylvania 0.47
± 0.22
0.78
± 0.22
1.00
± 0.17
1.01
± 0.11
2.79
± 0.19
3.63
± 0.41
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
± 3.11 ± 1.08 ± 0.52 ± 0.35 ± 0.24

Correlation to Global Land Average (R value)

Smoothing Monthly Annual Five-year Ten-year Twenty-year
0.39 0.68 0.86 0.92 0.95

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

Jan Feb Mar Apr May Jun
± 4.51 ± 4.25 ± 3.87 ± 2.66 ± 2.68 ± 2.30
Jul Aug Sep Oct Nov Dec
± 2.18 ± 1.94 ± 2.35 ± 2.80 ± 2.90 ± 3.95

History of Temperature Stations

Evolution of Climate Extremes

Mean of Daily High Temperature

Mean of Daily Low Temperature