Mean Rate of Change ( °C / Century )

Since: 1760 1810 1860 1910 1960 1990
Illinois 0.40
± 0.26
0.71
± 0.33
0.92
± 0.20
0.74
± 0.15
2.50
± 0.21
3.59
± 0.40
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
± 3.38 ± 1.17 ± 0.55 ± 0.38 ± 0.30

Correlation to Global Land Average (R value)

Smoothing Monthly Annual Five-year Ten-year Twenty-year
0.44 0.66 0.84 0.90 0.91

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

Jan Feb Mar Apr May Jun
± 5.10 ± 4.89 ± 4.30 ± 3.18 ± 3.05 ± 2.52
Jul Aug Sep Oct Nov Dec
± 2.39 ± 2.30 ± 2.64 ± 3.22 ± 3.46 ± 4.67

History of Temperature Stations

Evolution of Climate Extremes

Mean of Daily High Temperature

Mean of Daily Low Temperature