Heating Degree Days (HDD) for April
| Chronological | Ranked |
| Year | HDD | Deviation |
Rank | Year | HDD | Deviation |
| 2025 | 473.5 | -61.5 |
1 | 2018 | 827.5 | 292.4 |
| 2024 | 438.0 | -97.0 |
2 | 1950 | 781.0 | 245.9 |
| 2023 | 452.5 | -82.5 |
3 | 1975 | 758.0 | 222.9 |
| 2022 | 635.0 | 99.9 |
4 | 1907 | 731.0 | 195.9 |
| 2021 | 414.0 | -121.0 |
5 | 1961 | 713.0 | 177.9 |
| 2020 | 518.5 | -16.5 |
6 | 1926 | 709.0 | 173.9 |
| 2019 | 486.5 | -48.5 |
7 | 1909 | 705.5 | 170.4 |
| 2018 | 827.5 | 292.4 |
8 | 1979 | 702.0 | 166.9 |
| 2017 | 394.5 | -140.5 |
9 | 1953 | 701.0 | 165.9 |
| 2016 | 445.0 | -90.0 |
10 | 1918 | 699.5 | 164.4 |
| 2015 | 469.5 | -65.5 |
11 | 1928 | 699.5 | 164.4 |
| 2014 | 583.0 | 47.9 |
12 | 1944 | 695.5 | 160.4 |
| 2013 | 660.0 | 124.9 |
13 | 1982 | 692.0 | 156.9 |
| 2012 | 439.0 | -96.0 |
14 | 1951 | 684.0 | 148.9 |
| 2011 | 523.0 | -12.0 |
15 | 1920 | 682.0 | 146.9 |
| 2010 | 337.5 | -197.5 |
16 | 1983 | 670.5 | 135.4 |
| 2009 | 538.5 | 3.4 |
17 | 1972 | 668.5 | 133.4 |
| 2008 | 546.5 | 11.4 |
18 | 2013 | 660.0 | 124.9 |
| 2007 | 568.5 | 33.4 |
19 | 1936 | 659.5 | 124.4 |
| 2006 | 366.0 | -169.0 |
20 | 1904 | 648.0 | 112.9 |
| 2005 | 401.5 | -133.5 |
21 | 1966 | 643.5 | 108.4 |
| 2004 | 469.0 | -66.0 |
22 | 1956 | 642.0 | 106.9 |
| 2003 | 501.5 | -33.5 |
23 | 1947 | 637.0 | 101.9 |
| 2002 | 525.0 | -10.0 |
24 | 1993 | 637.0 | 101.9 |
| 2001 | 390.5 | -144.5 |
25 | 2022 | 635.0 | 99.9 |
| 2000 | 469.0 | -66.0 |
26 | 1973 | 630.0 | 94.9 |
| 1999 | 445.5 | -89.5 |
27 | 1995 | 630.0 | 94.9 |
| 1998 | 439.0 | -96.0 |
28 | 1917 | 629.5 | 94.4 |
| 1997 | 603.5 | 68.4 |
29 | 1923 | 627.0 | 91.9 |
| 1996 | 605.5 | 70.4 |
30 | 1943 | 619.0 | 83.9 |
| 1995 | 630.0 | 94.9 |
31 | 1939 | 613.0 | 77.9 |
| 1994 | 520.5 | -14.5 |
32 | 1940 | 612.5 | 77.4 |
| 1993 | 637.0 | 101.9 |
33 | 1962 | 607.5 | 72.4 |
| 1992 | 595.5 | 60.4 |
34 | 1996 | 605.5 | 70.4 |
| 1991 | 442.0 | -93.0 |
35 | 1997 | 603.5 | 68.4 |
| 1990 | 508.0 | -27.0 |
36 | 1924 | 601.5 | 66.4 |
| 1989 | 535.0 | 0.0 |
37 | 1916 | 599.5 | 64.4 |
| 1988 | 511.0 | -24.0 |
38 | 1935 | 599.0 | 63.9 |
| 1987 | 374.0 | -161.0 |
39 | 1992 | 595.5 | 60.4 |
| 1986 | 393.5 | -141.5 |
40 | 1965 | 594.5 | 59.4 |
| 1985 | 407.5 | -127.5 |
41 | 1933 | 584.0 | 48.9 |
| 1984 | 535.5 | 0.4 |
42 | 2014 | 583.0 | 47.9 |
| 1983 | 670.5 | 135.4 |
43 | 1898 | 578.5 | 43.4 |
| 1982 | 692.0 | 156.9 |
44 | 1978 | 571.0 | 35.9 |
| 1981 | 429.5 | -105.5 |
45 | 2007 | 568.5 | 33.4 |
| 1980 | 524.0 | -11.0 |
46 | 1932 | 567.5 | 32.4 |
| 1979 | 702.0 | 166.9 |
47 | 1905 | 566.0 | 30.9 |
| 1978 | 571.0 | 35.9 |
48 | 1937 | 566.0 | 30.9 |
| 1977 | 346.0 | -189.0 |
49 | 1897 | 565.0 | 29.9 |
| 1976 | 473.5 | -61.5 |
50 | 1945 | 560.0 | 24.9 |
| 1975 | 758.0 | 222.9 |
51 | 1934 | 556.0 | 20.9 |
| 1974 | 503.5 | -31.5 |
52 | 2008 | 546.5 | 11.4 |
| 1973 | 630.0 | 94.9 |
53 | 1902 | 539.5 | 4.4 |
| 1972 | 668.5 | 133.4 |
54 | 1908 | 539.0 | 3.9 |
| 1971 | 523.0 | -12.0 |
55 | 2009 | 538.5 | 3.4 |
| 1970 | 507.0 | -28.0 |
56 | 1984 | 535.5 | 0.4 |
| 1969 | 467.5 | -67.5 |
57 | 1989 | 535.0 | 0.0 |
| 1968 | 448.0 | -87.0 |
58 | 1949 | 531.5 | -3.5 |
| 1967 | 490.0 | -45.0 |
59 | 1911 | 531.0 | -4.0 |
| 1966 | 643.5 | 108.4 |
60 | 1899 | 530.5 | -4.5 |
| 1965 | 594.5 | 59.4 |
61 | 1919 | 530.5 | -4.5 |
| 1964 | 488.5 | -46.5 |
62 | 1958 | 530.5 | -4.5 |
| 1963 | 465.5 | -69.5 |
63 | 1959 | 526.0 | -9.0 |
| 1962 | 607.5 | 72.4 |
64 | 1927 | 525.5 | -9.5 |
| 1961 | 713.0 | 177.9 |
65 | 2002 | 525.0 | -10.0 |
| 1960 | 504.0 | -31.0 |
66 | 1980 | 524.0 | -11.0 |
| 1959 | 526.0 | -9.0 |
67 | 1971 | 523.0 | -12.0 |
| 1958 | 530.5 | -4.5 |
68 | 2011 | 523.0 | -12.0 |
| 1957 | 506.0 | -29.0 |
69 | 1952 | 522.5 | -12.5 |
| 1956 | 642.0 | 106.9 |
70 | 1994 | 520.5 | -14.5 |
| 1955 | 339.5 | -195.5 |
71 | 2020 | 518.5 | -16.5 |
| 1954 | 442.0 | -93.0 |
72 | 1901 | 517.5 | -17.5 |
| 1953 | 701.0 | 165.9 |
73 | 1930 | 516.5 | -18.5 |
| 1952 | 522.5 | -12.5 |
74 | 1931 | 516.5 | -18.5 |
| 1951 | 684.0 | 148.9 |
75 | 1922 | 513.0 | -22.0 |
| 1950 | 781.0 | 245.9 |
76 | 1988 | 511.0 | -24.0 |
| 1949 | 531.5 | -3.5 |
77 | 1912 | 510.5 | -24.5 |
| 1948 | 486.0 | -49.0 |
78 | 1990 | 508.0 | -27.0 |
| 1947 | 637.0 | 101.9 |
79 | 1970 | 507.0 | -28.0 |
| 1946 | 474.5 | -60.5 |
80 | 1957 | 506.0 | -29.0 |
| 1945 | 560.0 | 24.9 |
81 | 1960 | 504.0 | -31.0 |
| 1944 | 695.5 | 160.4 |
82 | 1929 | 503.5 | -31.5 |
| 1943 | 619.0 | 83.9 |
83 | 1974 | 503.5 | -31.5 |
| 1942 | 434.5 | -100.5 |
84 | 2003 | 501.5 | -33.5 |
| 1941 | 407.5 | -127.5 |
85 | 1938 | 490.5 | -44.5 |
| 1940 | 612.5 | 77.4 |
86 | 1967 | 490.0 | -45.0 |
| 1939 | 613.0 | 77.9 |
87 | 1964 | 488.5 | -46.5 |
| 1938 | 490.5 | -44.5 |
88 | 2019 | 486.5 | -48.5 |
| 1937 | 566.0 | 30.9 |
89 | 1948 | 486.0 | -49.0 |
| 1936 | 659.5 | 124.4 |
90 | 1903 | 478.0 | -57.0 |
| 1935 | 599.0 | 63.9 |
91 | 1946 | 474.5 | -60.5 |
| 1934 | 556.0 | 20.9 |
92 | 1976 | 473.5 | -61.5 |
| 1933 | 584.0 | 48.9 |
93 | 2025 | 473.5 | -61.5 |
| 1932 | 567.5 | 32.4 |
94 | 1913 | 469.5 | -65.5 |
| 1931 | 516.5 | -18.5 |
95 | 2015 | 469.5 | -65.5 |
| 1930 | 516.5 | -18.5 |
96 | 2000 | 469.0 | -66.0 |
| 1929 | 503.5 | -31.5 |
97 | 2004 | 469.0 | -66.0 |
| 1928 | 699.5 | 164.4 |
98 | 1914 | 468.5 | -66.5 |
| 1927 | 525.5 | -9.5 |
99 | 1969 | 467.5 | -67.5 |
| 1926 | 709.0 | 173.9 |
100 | 1963 | 465.5 | -69.5 |
| 1925 | 422.0 | -113.0 |
101 | 1894 | 453.5 | -81.5 |
| 1924 | 601.5 | 66.4 |
102 | 2023 | 452.5 | -82.5 |
| 1923 | 627.0 | 91.9 |
103 | 1968 | 448.0 | -87.0 |
| 1922 | 513.0 | -22.0 |
104 | 1999 | 445.5 | -89.5 |
| 1921 | 403.0 | -132.0 |
105 | 2016 | 445.0 | -90.0 |
| 1920 | 682.0 | 146.9 |
106 | 1954 | 442.0 | -93.0 |
| 1919 | 530.5 | -4.5 |
107 | 1991 | 442.0 | -93.0 |
| 1918 | 699.5 | 164.4 |
108 | 1900 | 441.0 | -94.0 |
| 1917 | 629.5 | 94.4 |
109 | 1998 | 439.0 | -96.0 |
| 1916 | 599.5 | 64.4 |
110 | 2012 | 439.0 | -96.0 |
| 1915 | 297.0 | -238.0 |
111 | 2024 | 438.0 | -97.0 |
| 1914 | 468.5 | -66.5 |
112 | 1942 | 434.5 | m |
| 1913 | 469.5 | -65.5 |
113 | 1910 | 431.5 | -100.5 |
| 1912 | 510.5 | -24.5 |
114 | 1981 | 429.5 | -103.5 |
| 1911 | 531.0 | -4.0 |
115 | 1925 | 422.0 | -105.5 |
| 1910 | 431.5 | -103.5 |
116 | 2021 | 414.0 | -113.0 |
| 1909 | 705.5 | 170.4 |
117 | 1906 | 409.5 | -121.0 |
| 1908 | 539.0 | 3.9 |
118 | 1941 | 407.5 | -125.5 |
| 1907 | 731.0 | 195.9 |
119 | 1985 | 407.5 | -127.5 |
| 1906 | 409.5 | -125.5 |
120 | 1895 | 406.0 | -127.5 |
| 1905 | 566.0 | 30.9 |
121 | 1921 | 403.0 | -129.0 |
| 1904 | 648.0 | 112.9 |
122 | 2005 | 401.5 | -132.0 |
| 1903 | 478.0 | -57.0 |
123 | 2017 | 394.5 | -133.5 |
| 1902 | 539.5 | 4.4 |
124 | 1986 | 393.5 | -140.5 |
| 1901 | 517.5 | -17.5 |
125 | 1896 | 390.5 | -141.5 |
| 1900 | 441.0 | -94.0 |
126 | 2001 | 390.5 | -144.5 |
| 1899 | 530.5 | -4.5 |
127 | 1987 | 374.0 | -144.5 |
| 1898 | 578.5 | 43.4 |
128 | 2006 | 366.0 | -161.0 |
| 1897 | 565.0 | 29.9 |
129 | 1977 | 346.0 | -169.0 |
| 1896 | 390.5 | -144.5 |
130 | 1955 | 339.5 | -189.0 |
| 1895 | 406.0 | -129.0 |
131 | 2010 | 337.5 | -195.5 |
| 1894 | 453.5 | -81.5 |
132 | 1915 | 297.0 | -197.5 |
| 1893 | m | m |
133 | 1893 | m | -238.0 |
| Mean | 535.0 |
|
| SD | 102.6 |
|