1990 1991 1992 1993
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Jan 12 10 13 8
Feb 10 8 13 11
Mar 6 9 9 8
Apr 4 7 9 10
May 16 11 9 17
Jun 9 13 12 16
Jul 11 13 12 21
Aug 23 17 18 26
Sep 25 19 22 33*
Oct 18 12 17 24
Nov 11 8 9 14
Dec 6 6 7 10
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151 133 150 198
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*1993's "Summer of Lights" culminated in the highest recorded number of sightings--averaging more than one a day.