April U.S. Percentage Areas Very Warm/Very Cold
%
1895
15.61
0.21
1896
32.87
10.12
1897
0.42
0.00
1898
6.16
17.41
1899
0.38
2.39
1900
10.60
8.51
1901
0.00
22.27
1902
5.38
1.59
1903
0.00
3.07
1904
0.80
30.37
1905
0.00
3.54
1906
8.15
0.00
1907
0.00
52.42
1908
14.24
1.35
1909
0.00
26.35
1910
28.23
0.84
1911
0.74
5.64
1912
1.28
14.77
1913
1.04
4.08
1914
0.00
2.67
1915
45.75
1.64
1916
0.00
4.74
1917
0.00
20.14
1918
0.00
20.54
1919
0.00
0.45
1920
0.00
55.85
1921
13.07
0.47
1922
7.35
19.73
1923
0.00
1.71
1924
0.00
0.53
1925
49.84
0.45
1926
17.77
37.30
1927
14.43
1.17
1928
0.00
37.28
1929
11.60
9.94
1930
40.99
0.02
1931
1.97
13.41
1932
0.00
0.42
1933
0.00
9.66
1934
30.22
0.00
1935
0.00
7.78
1936
2.25
18.49
1937
0.00
0.00
1938
0.00
0.00
1939
6.06
3.93
1940
0.35
9.13
1941
21.04
10.87
1942
15.58
0.00
1943
31.05
9.69
1944
0.00
15.81
1945
12.09
13.60
1946
43.16
0.00
1947
5.65
1.16
1948
42.22
4.54
1949
9.37
4.21
1950
0.00
38.19
1951
0.17
12.02
1952
6.87
6.99
1953
0.00
23.34
1954
53.67
2.18
1955
48.31
13.79
1956
0.00
10.29
1957
4.82
3.29
1958
0.00
2.88
1959
5.90
3.11
1960
6.03
0.00
1961
0.00
33.51
1962
9.71
4.51
1963
16.36
11.54
1964
0.67
0.53
1965
13.19
1.16
1966
1.45
10.89
1967
27.26
23.68
1968
4.20
6.20
1969
4.02
0.00
1970
4.14
35.74
1971
0.00
0.89
1972
8.80
9.81
1973
0.00
28.51
1974
0.16
0.00
1975
0.00
59.97
1976
3.60
0.00
1977
27.55
0.00
1978
4.07
0.00
1979
0.00
3.81
1980
8.88
2.32
1981
53.61
0.00
1982
0.45
23.04
1983
0.00
63.05
1984
0.23
10.80
1985
23.31
0.00
1986
15.50
0.75
1987
42.42
10.21
1988
0.25
0.00
1989
25.44
0.00
1990
19.17
0.00
1991
18.42
0.00
1992
27.32
0.38
1993
0.46
18.18
1994
7.14
0.00
1995
0.24
8.04
1996
1.08
5.17
1997
0.00
49.78
1998
5.08
4.74
1999
15.36
5.54
2000
24.36
1.22
2001
23.28
0.00
2002
32.62
0.00
2003
1.16
1.83
2004
4.39
0.40
2005
10.04
2.67
2006
67.01
0.00
2007
0.00
12.29
2008
6.74
9.67
2009
1.10
0.00
2010
32.21
0.00
2011
25.37
8.34
2012
43.64
0.00
2013
3.01
23.02
2014
1.61
0.32
2015
8.12
0.00
2016
12.34
0.00
2017
31.92
0.00
2018
11.06
43.65
2019
8.03
0.00
2020
3.42
0.00
2021
7.64
0.45
2022
9.61
18.41
2023
8.30
2.73