FreeLists / az-observing / [AZ-Observing] Again: Abnormally Clear March

[Tom Polakis <tpolakis@xxxxxxx>]

Here is that message again, hopefully without munched text and links.

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It sure seems like the past month has been clearer than usual.  I wondered how 
much so, and went to Brian Skiff's nighttime cloudiness summary, much of which 
I had already entered into a spreadsheet. 
 
http://www.lowell.edu/Research/cloudiness_data/clouds.html 
 
 
Here is my plot of this month's cloudiness with the data for the month of 
March back to 1980. 
 
http://members.cox.net/tpolakis/astro/clouds_0308.jpg 
 
 
The average number of March nights that are clear dusk to dawn 
(photometric) is 5.8 In 2008, we had 13 of them.  Including "partial" 
nights as clear for our purposes brings the total of clear nights to 20, 
which also compares well against the average of 10.2. 
 
Of course, the Phoenix precipitation for March 2008 was 0.00 inches. 
 
Tom 
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