| Year | HDD | Trend | CDD | Trend |
|---|---|---|---|---|
| 1951 | 2234.3 | 2372.529 | 67.2 | 71.374 |
| 1952 | 2436.4 | 2372.832 | 94.3 | 70.879 |
| 1953 | 2240.7 | 2373.135 | 69.6 | 70.385 |
| 1954 | 2481.5 | 2373.439 | 55 | 69.89 |
| 1955 | 2442.9 | 2373.742 | 65.9 | 69.396 |
| 1956 | 2706.4 | 2374.045 | 55 | 68.901 |
| 1957 | 2235.5 | 2374.348 | 65.8 | 68.407 |
| 1958 | 2345.4 | 2374.652 | 69.2 | 67.912 |
| 1959 | 2206.2 | 2374.955 | 77.8 | 67.418 |
| 1960 | 2252.3 | 2375.258 | 52.6 | 66.923 |
| 1961 | 2122.4 | 2375.562 | 71.1 | 66.429 |
| 1962 | 2562.2 | 2375.865 | 73.3 | 65.934 |
| 1963 | 2663.2 | 2376.168 | 68.8 | 65.44 |
| 1964 | 2440.5 | 2376.472 | 80.1 | 64.945 |
| 1965 | 2504.3 | 2376.775 | 51.7 | 64.451 |
| 1966 | 2265.2 | 2377.078 | 58 | 63.956 |
| 1967 | 2256.4 | 2377.382 | 74 | 63.462 |
| 1968 | 2349.1 | 2377.685 | 55.1 | 62.967 |
| 1969 | 2503.4 | 2377.988 | 57.7 | 62.472 |
| 1970 | 2455.2 | 2378.292 | 65.8 | 61.978 |
| 1971 | 2355.3 | 2378.595 | 71.8 | 61.483 |
| 1972 | 2365.9 | 2378.898 | 46.4 | 60.989 |
| 1973 | 2416.9 | 2379.202 | 72.4 | 60.494 |
| 1974 | 2215.6 | 2379.505 | 60.2 | 60 |
| 1975 | 2247.9 | 2379.808 | 74.7 | 59.505 |
| 1976 | 2406.5 | 2380.111 | 73.7 | 59.011 |
| 1977 | 2225.5 | 2380.415 | 41.2 | 58.516 |
| 1978 | 2425.9 | 2380.718 | 46.3 | 58.022 |
| 1979 | 2444.7 | 2381.021 | 57.6 | 57.527 |
| 1980 | 2500.1 | 2381.325 | 53.8 | 57.033 |
| 1981 | 2356.2 | 57.8 | ||
| 1982 | 2256.8 | 2334.99 | 84.2 | 75.851 |
| 1983 | 2239.3 | 2325.07 | 99.7 | 77.069 |
| 1984 | 2347.8 | 2315.15 | 55.4 | 78.287 |
| 1985 | 2578.3 | 2305.231 | 80.4 | 79.506 |
| 1986 | 2461.5 | 2295.311 | 72.2 | 80.724 |
| 1987 | 2500.7 | 2285.391 | 80.4 | 81.942 |
| 1988 | 2172.7 | 2275.471 | 79.6 | 83.161 |
| 1989 | 2028.1 | 2265.551 | 80.2 | 84.379 |
| 1990 | 2010.4 | 2255.631 | 90.7 | 85.598 |
| 1991 | 2379.1 | 2245.711 | 93.8 | 86.816 |
| 1992 | 2184.6 | 2235.792 | 97.2 | 88.034 |
| 1993 | 2294.6 | 2225.872 | 72.1 | 89.253 |
| 1994 | 2039.9 | 2215.952 | 121.9 | 90.471 |
| 1995 | 2177.3 | 2206.032 | 98.5 | 91.689 |
| 1996 | 2485.9 | 2196.112 | 65.7 | 92.908 |
| 1997 | 2160 | 2186.192 | 85.6 | 94.126 |
| 1998 | 2137.3 | 2176.272 | 90.6 | 95.344 |
| 1999 | 2087.2 | 2166.353 | 100.1 | 96.563 |
| 2000 | 1941.9 | 2156.433 | 95.4 | 97.781 |
| 2001 | 2163.9 | 2146.513 | 102.2 | 99 |
| 2002 | 1993.2 | 2136.593 | 87.3 | 100.218 |
| 2003 | 2206.8 | 2126.673 | 173 | 101.436 |
| 2004 | 2146.2 | 2116.753 | 89.5 | 102.655 |
| 2005 | 2192.1 | 2106.833 | 91.8 | 103.873 |
| 2006 | 2090.5 | 2096.914 | 132.3 | 105.091 |
| 2007 | 1925 | 2086.994 | 97.7 | 106.31 |
| 2008 | 2006.3 | 2077.074 | 94.1 | 107.528 |
| 2009 | 2107.2 | 2067.154 | 116.8 | 108.746 |
| 2010 | 2422.8 | 2057.234 | 105.5 | 109.965 |
| 2011 | 1962.4 | 2047.314 | 102 | 111.183 |
| 2012 | 2151.4 | 2037.394 | 127 | 112.402 |
| 2013 | 2195.5 | 2027.474 | 112.3 | 113.62 |
| 2014 | 1759 | 2017.555 | 88 | 114.838 |