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| Year | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | YEAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | X | X | X | 3 | 6 | 7 | 18 | 15 | 11 | 0 | 0 | 0 | X |
| 1991 | 0 | 0 | 1 | 1 | 14 | 17 | 17 | 16 | 6 | 0 | 0 | 0 | 72 |
| 1992 | 0 | X | 2 | 1 | 9 | 12 | 18 | 16 | 2 | 1 | 0 | 0 | 61 |
| 1993 | 0 | 0 | 0 | 2 | 14 | 8 | 9 | 13 | 6 | 0 | 0 | 0 | 52 |
| 1994 | 0 | 0 | 0 | 4 | 9 | 9 | 13 | 15 | 7 | 2 | 1 | 0 | 60 |
| 1995 | 0 | 0 | 0 | 2 | 13 | 14 | 8 | 11 | 10 | 0 | 0 | 0 | 58 |
| 1996 | 0 | 0 | 0 | 0 | 3 | 15 | 11 | 14 | 11 | 1 | 0 | 0 | 44 |
| 1997 | 0 | 0 | 0 | 0 | 8 | 19 | 13 | 21 | 4 | 1 | 0 | 0 | 65 |
| 1998 | 0 | 0 | 2 | 1 | 7 | 10 | 12 | 14 | 7 | 1 | 0 | 0 | 54 |
| 1999 | 0 | 0 | 0 | 0 | 9 | 9 | 13 | 14 | 4 | 0 | 0 | 0 | 49 |
| 2000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 17 | 6 | 1 | 0 | 0 | 23 |
| 2001 | 0 | 0 | 2 | 3 | 5 | 7 | 18 | 15 | 8 | 1 | 0 | 0 | 59 |
| 2002 | 0 | 0 | 0 | 0 | 5 | 10 | 3 | 12 | 6 | 1 | 0 | 0 | 32 |
| 2003 | 0 | 0 | 0 | 10 | 10 | 13 | 11 | 6 | 2 | 0 | 0 | 0 | 52 |
| 2004 | 0 | 0 | 1 | 2 | 6 | 14 | 17 | 12 | X | 2 | 0 | X | 42 |
| 2005 | 0 | 0 | 0 | 2 | 6 | 15 | 11 | 9 | 5 | 1 | 0 | 0 | 49 |
| 2006 | 0 | 0 | 0 | 0 | 7 | 8 | 15 | 12 | 4 | 0 | 0 | 0 | 46 |
| 2007 | 0 | 0 | 1 | 1 | 14 | 8 | 11 | 15 | 6 | 2 | 0 | ||
| 2008 | 0 | 0 | 0 | 0 | 0 | 3 | 5 | 5 | 11 | 2 | 4 | 0 | |
| 1990-2002 average | 0.0 | 0.0 | 0.5 | 1.3 | 7.8 | 10.5 | 11.8 | 14.8 | 6.8 | .7 | 0.08 | 0.0 | 54.4 |
| 1990-1996 std | 0.0 | 0.0 | 0.9 | 1.1 | 3.3 | 3.9 | 4.5 | 2.0 | 3.2 | 0.8 | .4 | 0.0 | X |
| 1971-96 average | 0.1 | 0.1 | 0.5 | 1.6 | 8.2 | 11.1 | 14.3 | 12.6 | 5.8 | 0.7 | 0.2 | 0.0 | X |
| 1971-96 std | .2 | .2 | 0.7 | 1.6 | 3.5 | 3.8 | 3.3 | 3.2 | 2.8 | 0.9 | .4 | 0.0 | X |
Thuderstorm data for 1971-1996 excludes the years 1984-1989 (not currently available). Data was taken by a different person for the time periods 1971-1983 and 1990-1996.