FreeLists / az-observing / [AZ-Observing] Re: Flagstaff nighttime cloudiness/sky brightness

[BillFerris@xxxxxxx]

Four years ago when I was organizing the Mormon Mountain Star Stare for the  
Coconino Astronomical Society, I used Brian's nighttime cloudiness data to 
find  the best half-months for observing in northern Arizona. Using his data 
from 
 1979-2002, June was obviously the best month of the year. June averaged 14  
photometric (cloud-free dusk-to-dawn) nights and only 8 1/2  totally unusable 
nights over that period. When I broke it down to  half-months, the first 15 
days of June were the clear winner with an average 8  photometric and only 3 
unusable nights. The surprising (to  me) 2nd place winner was the back half of 
September, which  averages about 7 1/2 photometric nights and about 3 1/2 
unusable  nights.
 
Bill in Flag
 
In a message dated 6/13/2007 6:30:56 AM US Mountain Standard Time,  
jimmy_ray@xxxxxxx writes:
Hi  Brian,

Great data. Based on a quick glance it looks to be that June is  far and away 
the best month to be up there. Which means our odds of having  a spectacular 
night at 5 Mile Meadow this week end are very good. Current  weather supports 
Saterday night as beening just that... We will see. Thank  you for posting 
your data..

Jimmy Ray







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