Andrew Cooper asked rhetorically "what happened to a dry and clear May?" Since I have kept nighttime cloudiness records for 20+ years, I can tell you the answer: "it didn't go anywhere in particular", or maybe more specifically "it wasn't clear on Saturdays this May". Here's a list of the sum of nights I called "photometric" (cloudless from dusk to dawn) plus "partial" (at least three consecutive hours cloudless) for the last 23 Mays. The last entry assumes tonight (27th) will be cloudy, a near-certainty. year nights 1979 14 1980 13 1981 15 1982 20 1983 26 1984 12 1985 10 1986 12 1987 9 1988 17 1989 11 1990 15 1991 21 1992 4 1993 15 1994 14 1995 8 1996 16 1997 2 1998 15 1999 13 2000 15 2001 (10 thusfar from 27 nights) Excluding the current month, the 22 other Mays average 13.5 "good" nights. The rms scatter is large, however, about 5. Thus two-thirds of the time we get between 8 and 19 workable nights during May. Notice some really suck-y years, such as May 1997, which is probably too far back for anyone to remember. So far in 2001 we've had 10 good nights by my quite conservative criteria, well within the typical range of the previous 22 years. These figures are for Flagstaff, but the overall trend would doubtless be very similar for Phoenix or Tucson. If you were to go through my calendric logs and count up just the Friday or Saturday nights that were clear (the only nights most amateurs observe), the small-number statistics might get you, and give much slimmer pickings. This month I discovered three near-Earth asteroids and a comet, so I'm not complaining, especially since it's taken me two whole days to recover from the last observing run. \Brian --- This message is from the AZ-Observing mailing list. If you wish to be removed from this list, send E-mail to: AZ-Observing-request@xxxxxxxxxxxxx, with the subject: unsubscribe. The list's archive is at: //www.freelists.org/archives/az-observing This is a discussion list. Please send personal inquiries directly to the message author. In other words, do not use "reply" for personal messages. Thanks.