Heating Degree Days (HDD) for April
| Chronological | Ranked |
| Year | HDD | Deviation |
Rank | Year | HDD | Deviation |
| 2024 | 547.0 | -54.9 |
1 | 2018 | 914.5 | 312.5 |
| 2023 | 609.5 | 7.5 |
2 | 1950 | 822.0 | 220.0 |
| 2022 | 742.0 | 140.0 |
3 | 1961 | 812.5 | 210.5 |
| 2021 | 562.0 | -39.9 |
4 | 1909 | 791.5 | 189.5 |
| 2020 | 667.5 | 65.5 |
5 | 1983 | 772.0 | 170.0 |
| 2019 | 608.0 | 6.0 |
6 | 1953 | 768.0 | 166.0 |
| 2018 | 914.5 | 312.5 |
7 | 1975 | 761.0 | 159.0 |
| 2017 | 508.0 | -93.9 |
8 | 1936 | 747.0 | 145.0 |
| 2016 | 539.5 | -62.4 |
9 | 2013 | 743.0 | 141.0 |
| 2015 | 518.5 | -83.4 |
10 | 2022 | 742.0 | 140.0 |
| 2014 | 685.0 | 83.0 |
11 | 1995 | 740.0 | 138.0 |
| 2013 | 743.0 | 141.0 |
12 | 1956 | 737.0 | 135.0 |
| 2012 | 478.5 | -123.4 |
13 | 1951 | 731.5 | 129.5 |
| 2011 | 589.5 | -12.4 |
14 | 1996 | 726.5 | 124.5 |
| 2010 | 363.0 | -238.9 |
15 | 1982 | 724.5 | 122.5 |
| 2009 | 570.0 | -31.9 |
16 | 1966 | 722.5 | 120.5 |
| 2008 | 626.5 | 24.5 |
17 | 1962 | 714.0 | 112.0 |
| 2007 | 614.5 | 12.5 |
18 | 1972 | 711.5 | 109.5 |
| 2006 | 410.0 | -191.9 |
19 | 1939 | 711.0 | 109.0 |
| 2005 | 451.5 | -150.4 |
20 | 1944 | 707.0 | 105.0 |
| 2004 | 502.0 | -99.9 |
21 | 1892 | 705.0 | 103.0 |
| 2003 | 594.0 | -7.9 |
22 | 1918 | 704.5 | 102.5 |
| 2002 | 624.0 | 22.0 |
23 | 1947 | 702.5 | 100.5 |
| 2001 | 522.5 | -79.4 |
24 | 1920 | 700.5 | 98.5 |
| 2000 | 581.5 | -20.4 |
25 | 1993 | 700.0 | 98.0 |
| 1999 | 549.0 | -52.9 |
26 | 1937 | 699.0 | 97.0 |
| 1998 | 477.0 | -124.9 |
27 | 1997 | 698.0 | 96.0 |
| 1997 | 698.0 | 96.0 |
28 | 1893 | 694.5 | 92.5 |
| 1996 | 726.5 | 124.5 |
29 | 1965 | 694.0 | 92.0 |
| 1995 | 740.0 | 138.0 |
30 | 1917 | 690.5 | 88.5 |
| 1994 | 619.0 | 17.0 |
31 | 1979 | 686.5 | 84.5 |
| 1993 | 700.0 | 98.0 |
32 | 1992 | 686.5 | 84.5 |
| 1992 | 686.5 | 84.5 |
33 | 2014 | 685.0 | 83.0 |
| 1991 | 514.5 | -87.4 |
34 | 1973 | 680.5 | 78.5 |
| 1990 | 602.0 | 0.0 |
35 | 1888 | 673.5 | 71.5 |
| 1989 | 628.0 | 26.0 |
36 | 2020 | 667.5 | 65.5 |
| 1988 | 629.0 | 27.0 |
37 | 1935 | 653.0 | 51.0 |
| 1987 | 432.5 | -169.4 |
38 | 1916 | 647.0 | 45.0 |
| 1986 | 500.0 | -101.9 |
39 | 1945 | 645.5 | 43.5 |
| 1985 | 464.0 | -137.9 |
40 | 1933 | 644.0 | 42.0 |
| 1984 | 606.5 | 4.5 |
41 | 1943 | 642.5 | 40.5 |
| 1983 | 772.0 | 170.0 |
42 | 1940 | 639.0 | 37.0 |
| 1982 | 724.5 | 122.5 |
43 | 1938 | 638.0 | 36.0 |
| 1981 | 507.0 | -94.9 |
44 | 1988 | 629.0 | 27.0 |
| 1980 | 550.5 | -51.4 |
45 | 1989 | 628.0 | 26.0 |
| 1979 | 686.5 | 84.5 |
46 | 1934 | 626.5 | 24.5 |
| 1978 | 608.5 | 6.5 |
47 | 2008 | 626.5 | 24.5 |
| 1977 | 376.0 | -225.9 |
48 | 1911 | 625.5 | 23.5 |
| 1976 | 474.0 | -127.9 |
49 | 2002 | 624.0 | 22.0 |
| 1975 | 761.0 | 159.0 |
50 | 1994 | 619.0 | 17.0 |
| 1974 | 551.5 | -50.4 |
51 | 1967 | 617.0 | 15.0 |
| 1973 | 680.5 | 78.5 |
52 | 2007 | 614.5 | 12.5 |
| 1972 | 711.5 | 109.5 |
53 | 2023 | 609.5 | 7.5 |
| 1971 | 575.5 | -26.4 |
54 | 1978 | 608.5 | 6.5 |
| 1970 | 595.0 | -6.9 |
55 | 2019 | 608.0 | 6.0 |
| 1969 | 534.0 | -67.9 |
56 | 1984 | 606.5 | 4.5 |
| 1968 | 513.5 | -88.4 |
57 | 1990 | 602.0 | 0.0 |
| 1967 | 617.0 | 15.0 |
58 | 1887 | 596.0 | -5.9 |
| 1966 | 722.5 | 120.5 |
59 | 1964 | 596.0 | -5.9 |
| 1965 | 694.0 | 92.0 |
60 | 1970 | 595.0 | -6.9 |
| 1964 | 596.0 | -5.9 |
61 | 2003 | 594.0 | -7.9 |
| 1963 | 564.5 | -37.4 |
62 | 2011 | 589.5 | -12.4 |
| 1962 | 714.0 | 112.0 |
63 | 1914 | 588.0 | -13.9 |
| 1961 | 812.5 | 210.5 |
64 | 1958 | 583.5 | -18.4 |
| 1960 | 583.0 | -18.9 |
65 | 1960 | 583.0 | -18.9 |
| 1959 | 564.0 | -37.9 |
66 | 1957 | 582.0 | -19.9 |
| 1958 | 583.5 | -18.4 |
67 | 2000 | 581.5 | -20.4 |
| 1957 | 582.0 | -19.9 |
68 | 1949 | 575.5 | -26.4 |
| 1956 | 737.0 | 135.0 |
69 | 1971 | 575.5 | -26.4 |
| 1955 | 398.5 | -203.4 |
70 | 2009 | 570.0 | -31.9 |
| 1954 | 536.5 | -65.4 |
71 | 1913 | 569.0 | -32.9 |
| 1953 | 768.0 | 166.0 |
72 | 1963 | 564.5 | -37.4 |
| 1952 | 554.5 | -47.4 |
73 | 1959 | 564.0 | -37.9 |
| 1951 | 731.5 | 129.5 |
74 | 2021 | 562.0 | -39.9 |
| 1950 | 822.0 | 220.0 |
75 | 1952 | 554.5 | -47.4 |
| 1949 | 575.5 | -26.4 |
76 | 1974 | 551.5 | -50.4 |
| 1948 | 469.0 | -132.9 |
77 | 1980 | 550.5 | -51.4 |
| 1947 | 702.5 | 100.5 |
78 | 1932 | 550.0 | -51.9 |
| 1946 | 467.0 | -134.9 |
79 | 1999 | 549.0 | -52.9 |
| 1945 | 645.5 | 43.5 |
80 | 2024 | 547.0 | -54.9 |
| 1944 | 707.0 | 105.0 |
81 | 1930 | 544.0 | -57.9 |
| 1943 | 642.5 | 40.5 |
82 | 2016 | 539.5 | -62.4 |
| 1942 | 439.0 | -162.9 |
83 | 1954 | 536.5 | -65.4 |
| 1941 | 410.5 | -191.4 |
84 | 1969 | 534.0 | -67.9 |
| 1940 | 639.0 | 37.0 |
85 | 2001 | 522.5 | -79.4 |
| 1939 | 711.0 | 109.0 |
86 | 2015 | 518.5 | -83.4 |
| 1938 | 638.0 | 36.0 |
87 | 1991 | 514.5 | -87.4 |
| 1937 | 699.0 | 97.0 |
88 | 1968 | 513.5 | -88.4 |
| 1936 | 747.0 | 145.0 |
89 | 2017 | 508.0 | -93.9 |
| 1935 | 653.0 | 51.0 |
90 | 1981 | 507.0 | -94.9 |
| 1934 | 626.5 | 24.5 |
91 | 1931 | 505.5 | -96.4 |
| 1933 | 644.0 | 42.0 |
92 | 2004 | 502.0 | m |
| 1932 | 550.0 | -51.9 |
93 | 1919 | 500.0 | m |
| 1931 | 505.5 | -96.4 |
94 | 1986 | 500.0 | m |
| 1930 | 544.0 | -57.9 |
95 | 1910 | 492.5 | m |
| 1929 | 276.5 | -325.4 |
96 | 2012 | 478.5 | m |
| 1928 | m | m |
97 | 1998 | 477.0 | m |
| 1927 | m | m |
98 | 1976 | 474.0 | m |
| 1926 | m | m |
99 | 1948 | 469.0 | m |
| 1925 | m | m |
100 | 1946 | 467.0 | m |
| 1924 | m | m |
101 | 1985 | 464.0 | m |
| 1923 | m | m |
102 | 1912 | 460.5 | m |
| 1922 | m | m |
103 | 2005 | 451.5 | m |
| 1921 | m | m |
104 | 1942 | 439.0 | m |
| 1920 | 700.5 | 98.5 |
105 | 1987 | 432.5 | m |
| 1919 | 500.0 | -101.9 |
106 | 1941 | 410.5 | m |
| 1918 | 704.5 | 102.5 |
107 | 2006 | 410.0 | m |
| 1917 | 690.5 | 88.5 |
108 | 1955 | 398.5 | m |
| 1916 | 647.0 | 45.0 |
109 | 1977 | 376.0 | m |
| 1915 | 337.5 | -264.4 |
110 | 2010 | 363.0 | m |
| 1914 | 588.0 | -13.9 |
111 | 1915 | 337.5 | m |
| 1913 | 569.0 | -32.9 |
112 | 1929 | 276.5 | m |
| 1912 | 460.5 | -141.4 |
113 | 1886 | m | m |
| 1911 | 625.5 | 23.5 |
114 | 1889 | m | m |
| 1910 | 492.5 | -109.4 |
115 | 1890 | m | m |
| 1909 | 791.5 | 189.5 |
116 | 1891 | m | m |
| 1908 | m | m |
117 | 1894 | m | m |
| 1907 | m | m |
118 | 1895 | m | m |
| 1906 | m | m |
119 | 1896 | m | -99.9 |
| 1905 | m | m |
120 | 1897 | m | -101.9 |
| 1904 | m | m |
121 | 1898 | m | -101.9 |
| 1903 | m | m |
122 | 1899 | m | -109.4 |
| 1902 | m | m |
123 | 1900 | m | -123.4 |
| 1901 | m | m |
124 | 1901 | m | -124.9 |
| 1900 | m | m |
125 | 1902 | m | -127.9 |
| 1899 | m | m |
126 | 1903 | m | -132.9 |
| 1898 | m | m |
127 | 1904 | m | -134.9 |
| 1897 | m | m |
128 | 1905 | m | -137.9 |
| 1896 | m | m |
129 | 1906 | m | -141.4 |
| 1895 | m | m |
130 | 1907 | m | -150.4 |
| 1894 | m | m |
131 | 1908 | m | -162.9 |
| 1893 | 694.5 | 92.5 |
132 | 1921 | m | -169.4 |
| 1892 | 705.0 | 103.0 |
133 | 1922 | m | -191.4 |
| 1891 | m | m |
134 | 1923 | m | -191.9 |
| 1890 | m | m |
135 | 1924 | m | -203.4 |
| 1889 | m | m |
136 | 1925 | m | -225.9 |
| 1888 | 673.5 | 71.5 |
137 | 1926 | m | -238.9 |
| 1887 | 596.0 | -5.9 |
138 | 1927 | m | -264.4 |
| 1886 | m | m |
139 | 1928 | m | -325.4 |
| Mean | 601.9 |
|
| SD | 111.9 |
|