| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 1945 | ---- | 51.4 | 74.3 | 53.9 |
| 1946 | 35.5 | 54.4 | 73.2 | 49.7 |
| 1947 | 34.1 | 58.1 | 71.6 | 53.3 |
| 1948 | 32.3 | 49.9 | 72.3 | 52.1 |
| 1949 | 24.2 | 55.9 | 73.0 | 54.6 |
| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 1950 | 26.0 | 50.4 | 72.8 | 53.1 |
| 1951 | 35.4 | 51.8 | 73.4 | 52.6 |
| 1952 | 29.8 | 54.0 | 72.7 | 54.0 |
| 1953 | 39.5 | 51.7 | 70.9 | 55.5 |
| 1954 | 35.3 | 51.9 | 70.3 | 54.2 |
| 1955 | 33.1 | 48.0 | 72.9 | 50.3 |
| 1956 | 28.9 | 55.1 | 73.3 | 52.0 |
| 1957 | 28.4 | 55.0 | 72.7 | 53.4 |
| 1958 | 40.0 | 54.3 | 78.2 | 53.5 |
| 1959 | 34.2 | 52.3 | 72.7 | 50.8 |
| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 1960 | 31.3 | 52.1 | 74.4 | 54.5 |
| 1961 | 35.9 | 52.8 | 77.9 | 50.2 |
| 1962 | 33.4 | 51.7 | 72.1 | 54.3 |
| 1963 | 33.5 | 52.6 | 72.5 | 56.6 |
| 1964 | 34.6 | 51.2 | 70.7 | 51.5 |
| 1965 | 32.8 | 52.7 | 73.5 | 54.2 |
| 1966 | 35.6 | 54.4 | 71.9 | 55.3 |
| 1967 | 40.6 | 50.8 | 77.5 | 56.1 |
| 1968 | 36.9 | 54.2 | 73.7 | 52.9 |
| 1969 | 27.4 | 54.2 | 74.6 | 52.9 |
| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 1970 | 35.3 | 51.8 | 76.2 | 50.8 |
| 1971 | 35.2 | 52.2 | 74.8 | 51.2 |
| 1972 | 32.0 | 53.6 | 74.5 | 51.2 |
| 1973 | 31.6 | 54.7 | 73.6 | 52.2 |
| 1974 | 36.1 | 52.0 | 74.2 | 54.0 |
| 1975 | 34.1 | 50.3 | 72.6 | 53.3 |
| 1976 | 34.7 | 50.9 | 70.5 | 54.0 |
| 1977 | 32.1 | 53.2 | 75.2 | 50.8 |
| 1978 | 34.7 | 52.7 | 72.9 | 49.4 |
| 1979 | 25.2 | 54.5 | 74.2 | 53.3 |
| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 1980 | 31.6 | 53.7 | 70.2 | 53.2 |
| 1981 | 38.1 | 54.4 | 73.0 | 53.7 |
| 1982 | 33.6 | 51.9 | 74.6 | 51.2 |
| 1983 | 36.8 | 54.5 | 70.4 | 52.6 |
| 1984 | 30.5 | 51.2 | 71.9 | 49.8 |
| 1985 | 26.2 | 54.2 | 74.3 | 44.5 |
| 1986 | 31.4 | 53.9 | 74.3 | 53.1 |
| 1987 | 34.4 | 57.5 | 74.8 | 56.3 |
| 1988 | 34.8 | 54.1 | 73.9 | 56.5 |
| 1989 | 32.1 | 54.0 | 73.6 | 55.2 |
| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 1990 | 37.1 | 55.5 | 75.9 | 57.1 |
| 1991 | 32.4 | 52.8 | 74.2 | 54.6 |
| 1992 | 39.3 | 58.2 | 76.8 | 53.8 |
| 1993 | 28.5 | 54.1 | 70.7 | 52.1 |
| 1994 | 36.7 | 57.4 | 75.8 | 54.8 |
| 1995 | 37.5 | 54.4 | 72.4 | 55.4 |
| 1996 | 31.4 | 52.6 | 74.7 | 51.7 |
| 1997 | 34.5 | 54.7 | 73.9 | 54.4 |
| 1998 | 37.7 | 55.1 | 77.0 | 56.3 |
| 1999 | 37.7 | 51.7 | 72.5 | 54.2 |
| Winter | Spring | Summer | Autumn | |
| YEAR | Dec-Feb | Mar-May | Jun-Aug | Sep-Nov |
| 2000 | 36.4 | 53.8 | 73.1 | 49.9 |
| 2001 | 32.9 | 54.0 | 73.4 | 55.1 |
| 2002 | 37.0 | 51.9 | 75.6 | 52.6 |
| 2003 | 38.4 | 54.1 | 76.4 | 54.8 |
| 2004 | 33.0 | 55.4 | 75.9 | 53.0 |
| 2005 | 34.6 | 55.6 | 74.2 | 52.6 |
| 2006 | 34.0 | 53.2 | 75.1 | 53.0 |
| 2007 | 31.9 | 54.3 | 74.5 | 52.1 |
| 2008 | 33.5 | 51.9 | 73.3 | 53.5 |
| 2009 | 30.2 | 51.9 | 75.8 | 53.2 |
| 2010 | 34.9 | 52.7 | 72.7 | 52.2 |
| 2011 | 34.1 | 49.9 | 72.3 | 54.0 |
| 2012 | 33.6 | 53.9 | 74.0 | 54.1 |
| AVERAGE | 33.7 | 53.3 | 73.7 | 53.1 |
| NORMAL | 34.2 | 54.0 | 74.2 | 53.3 |
Normals are 30 year averages (1981-2010)
