Subject: weather statistics for APO, March 1994 - Dec 1995

From: Stupendous Man

Submitted: Wed, 13 Dec 1995 15:10:44 -0500

Message number: 30 (previous: 29, next: 31 up: Index)

                          APO weather statistics

  For the period Mar 21, 1994 - Dec 8, 1995, (with many gaps in the
time coverage) I find the following results:

       - 446 total nights

       - 385 (86%) the telescope enclosure was opened; 
          61 (14%) nights, the telescope was kept closed

       - 103 (23%) nights were "photometric", meaning "clear all night"
         337 (76%) nights had at least some clouds
           6 ( 1%) I couldn't tell  

       - on nights when the enclosure was opened, the number of hours
            spent observing was 

                 < 1      1 - 3    3 - 5    5 - 7    7 - 9   9 - 11   > 11
               -------------------------------------------------------------
          nights  82       43        55      91       87       76     10
                 (21%)    (11%)     (20%)   (24%)    (24%)    (20%)  ( 3%)

       - on nights when seeing was reported, the average of values listed
            in the observing logs (from all instruments) was

                 < 1.25    1.25 - 1.75    1.75 - 2.25   2.25 - 2.75   > 2.75
              ---------------------------------------------------------------
          nights   36         172             70           21          11
                  (12%)       (55%)          (23%)        ( 7%)       ( 4%)

  I still haven't analyzed the long, long string of daily weather provided
by the Sunspot solar observers; if anyone would like to do so, please
let me know and I'll arrange access to the data.

                                     Michael Richmond

APO APO APO APO APO  Apache Point Observatory 3.5m  APO APO APO
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