First Minimum Temperature Below 30 Degrees At LAF

The temperature bottomed out at 29º this morning at the Purdue Airport, the first of the Fall season. So when is the typical first date of the first sub 30º min temp at LAF? Here's some stats...

Data from the Purdue University Airport since 1964

Earliest sub 30º min temp: September 23, 1995

Latest sub 30º min temp: November 14, 1975

Coldest first sub 30º min temp: 23º on October 21, 1974 and November 1, 1993

First sub 30º min temp by date range...
September 30 or earlier: 1 (1995)
October 1-10: 13 (1964, 1968, 1978, 1979, 1980, 1981, 1985, 1987, 1988, 1989, 2000, 2001, 2004)
October 11-20: 9 (1967, 1972, 1976, 1977, 1991, 1992, 1996, 2002, 2006)
October 21-31: 10 (1965, 1966, 1969, 1974, 1982, 1990, 1994, 1997, 2008, 2011)
November 1-10: 12 (1971, 1973, 1983, 1984, 1986, 1993, 1998, 1999, 2003, 2007, 2009, 2010)
November 11-20: 2 (1975, 2005)