| Greatest days ½" or More |
| Rank |
# of days |
Year |
| 1 |
41 |
1905 |
| 2 |
34 |
1908 |
3 (tie) |
32 |
2004 |
| 32 |
2000 |
| 32 |
1991 |
| 32 |
1942 |
7 (tie) |
31 |
1994 |
| 31 |
1919 |
| 9 |
30 |
1902 |
10 (tie) |
28 |
1979 |
| 28 |
1965 |
| 28 |
1957 |
| 28 |
1930 |
| 28 |
1914 |
| 28 |
1906 |
|
| Least days ½" or More |
| Rank |
# of days |
Year |
| 1 |
8 |
1954 |
2 (tie) |
10 |
1956 |
| 10 |
1917 |
| 4 |
12 |
1963 |
5 (tie) |
13 |
1980 |
| 13 |
1924 |
| 7 |
14 |
1951 |
8 (tie) |
15 |
1978 |
| 15 |
1948 |
| 15 |
1934 |
|