Subject: weather statistics for APO, Nov 7, 1994 to Feb 13, 1996
From: Stupendous Man
Submitted: Wed, 14 Feb 1996 10:21:57 -0500
Message number: 48
(previous: 47,
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APO weather statistics
For the period Nov 7, 1994 - Feb 13, 1996, I find the following
results:
- 512 total nights
- 435 (85%) the telescope enclosure was opened;
76 (15%) nights, the telescope was kept closed
- 115 (22%) nights were "photometric", meaning "clear all night"
390 (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 23 46 59 95 92 97 23
( 5%) (11%) (14%) (22%) (21%) (22%) ( 5%)
- 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 49 195 77 24 13
(14%) (54%) (22%) ( 7%) ( 4%)
My next goal is to try to characterize weather patterns; that is,
how often are there stretches of more than 3 good nights in a row?
If tonight is cloudy, what is the probability that tomorrow night
will be cloudy, too?
I append the night-by-night listing below. Any corrections or suggestions
for further work will be gratefully accepted.
------------------------- night-by-night log follows ----------------------
# Summary of APO weather, based on Dan Long's and Karen Gloria's
# nightly observing logs
#
# open/close "c" = telescope never opened "o" = opened
# obshrs sum of all hours listed as used to observe
# photo "y" = no clouds at all, "n" = some clouds, "d" = don't know
# seeing avg of values listed from all instruments (may reflect
# properties of instruments more than actual site)
# 0 = no measurements
# guider avail as of 3/16/95; yields smaller seeing?
# guiderseeing if present, the value of seeing based on the guide camera
# which might yield smaller (truer?) values than other
# instruments
#
# early times (before May 1994) are probably not representative of the
# number of hours that _could_ have been used, since the telescope
# and instruments weren't working well..
# guider
#date open/close obshrs photo(y/n/d) seeing seeing
#-------------------------------------------------------------------------
3/21/94 c 0 n 0
3/22/94 c 0 n 0
3/23/94 c 0 n 0
3/24/94 o 2 n 0
#
4/4/94 o 0 n 0
4/5/94 o 7 y 3.5
4/6/94 o 8 n 1.8
4/7/94 o 6 n 0
#
4/11/94 o 5.5 n 0
4/12/94 o 8.25 n 1.6
4/13/94 o 4.25 n 2.5
4/14/94 o 8 n 1.9
#
4/19/94 o 8 n 0
4/20/94 o 8.5 n 0
4/21/94 o 8.5 n 0
4/22/94 c 0 n 0
#
4/28/94 o 0 n 0
4/29/94 o 6 n 0
#
5/1/94 o 0 n 0
5/2/94 o 8.6 y 0
5/3/94 o 9.75 y 0
5/4/94 o 9.25 y 0
#
5/7/94 c 0 n 0
5/8/94 o 1.5 n 1.5
5/9/94 o 5.25 n 0
#
5/11/94 o 0.5 n 0
5/12/94 c 0 n 0
5/13/94 o 4.0 n 0
5/14/94 o 9.25 y 1.4
5/15/94 o 2.75 n 1.5
5/16/94 o 7 n 0
5/17/94 o 0.5 n 1.3
5/18/94 o 6.5 n 0
#
5/25/94 o 6.5 n 0
5/26/94 o 6.5 n 0
5/27/94 o 5.5 n 0
#
5/30/94 o 5.0 n 0
5/31/94 c 0 n 0
6/1/94 o 2 n 0
6/2/94 o 4.7 n 0
#
6/6/94 o 6 n 0
6/7/94 o 6.2 n 0
6/8/94 o 6.3 y 0
6/9/94 c 0 n 0
6/10/94 c 0 n 0
6/11/94 o 1 n 0
6/12/94 o 7 n 1.5
6/13/94 o 7 n 0
6/14/94 o 6.3 n 1.6
6/15/94 o 4.2 n 1.6
6/16/94 o 6.2 n 1.7
6/17/94 o 0.2 n 0
6/18/94 o 4.5 n 0
6/19/94 o 4.6 n 1.8
6/20/94 o 5.5 n 2.5
6/21/94 o 3.5 n 0
#
6/28/95 o 5.5 n 0
6/29/94 o 3 n 2.4
6/30/94 o 1.5 n 2.3
7/1/94 o 0 n 0
7/3/94 o 2.5 n 0
7/4/94 o 1.0 n 0
7/5/94 o 7.5 y 0
7/6/94 o 4.25 y 2.9
7/7/94 o 3.5 n 2.5
7/8/94 c 0 n 0
7/9/94 o 4.5 n 0
7/10/94 o 2.5 n 3
7/11/94 o 3.8 n 2.2
7/12/94 o 1.1 n 0
7/13/94 o 3.6 n 2.7
7/14/94 o 5.6 n 3
7/15/94 o 6 n 0
7/16/94 o 3.5 n 0
7/17/94 c 0 n 0
7/18/94 o 6.7 n 1.5
7/19/94 o 6.7 n 1.7
7/20/94 o 2.0 n 1.7
7/21/94 o 0.9 n 0
7/22/94 o 2.5 n 2.2
7/23/94 o 5.9 n 0
7/24/94 o 5.7 n 0
7/25/94 o 2 n 0
7/26/94 c 0 n 0
7/27/94 c 0 n 0
7/28/94 o 0 n 0
7/29/94 o 0 n 0
7/30/94 o 7 n 0
7/31/94 c 0 n 0
#
10/21/94 o 7 y 0
#
10/23/94 o 4.0 n 0
#
10/25/94 o 3.25 n 0
10/26/94 o 5.0 n 0
10/27/94 o 13 n 1.5
10/28/94 o 11 n 0
10/29/94 o 9.5 n 0
10/30/94 o 12.5 y 1.7
10/31/94 o 10.4 y 1.5
11/1/94 o 5.9 n 0
11/2/94 c 0 n 0
11/3/94 c 0 n 0
11/4/94 o 1.5 n 0
11/5/94 o 10.1 d 1.6
11/6/94 o 8.4 n 1.4
11/7/94 o 0 n 0
11/8/94 o 10.5 d 3
11/9/94 o 9.25 y 1.05
11/10/94 o 8.25 n 1.6
11/11/94 c 0 n 0
11/12/94 c 0 n 0
11/13/94 o 6.8 y 0
11/14/94 o 7.4 n 1.5
11/15/94 o 2.6 n 0
11/16/94 o 2.9 n 1.6
11/17/94 o 10 y 2.1
11/18/94 o 4 n 1.3
11/19/94 c 0 n 0
11/20/94 o 7.1 y 1.3
11/21/94 o 5.2 n 1.6
11/22/94 c 0 n 0
11/23/94 o 9.4 d 1.3
11/24/94 o 5.7 n 1.3
11/25/94 c 0 n 0
11/26/94 c 0 n 0
11/27/94 o 7.8 y 3
11/28/94 o 10.4 y 1.7
11/29/94 o 8.3 y 1.6
11/30/94 o 8.4 y 1.1
12/1/94 o 9.6 n 1.2
12/2/94 o 9.9 y 1.3
12/3/94 o 5.8 n 1.9
12/4/94 o 4.0 n 1.2
#
12/6/94 o 8.2 n 2.3
12/7/94 o 13.5 y 1.7
12/8/94 o 12.5 n 1.6
12/9/94 o 5.8 d 1.6
12/10/94 o 4.8 n 1.8
12/11/94 o 9.5 n 1.6
12/12/94 c 0 n 0
12/13/94 o 4.9 n 2.1
12/14/94 o 11.1 n 1.1
12/15/94 o 10.3 n 1.8
12/16/94 o 11.0 y 1.4
12/17/94 o 9.2 y 1.7
12/18/94 o 11.0 y 1.8
12/19/94 o 9.9 y 1.5
12/20/94 o 9.5 y 2.5
12/21/94 o 10.8 n 1.5
12/22/94 c 0 n 0
12/23/94 c 0 n 0
12/24/94 c 0 n 0
12/25/94 o 3.3 n 1.1
12/26/94 c 0 n 0
12/27/94 c 0 n 0
12/28/94 o 5 y 1.8
12/29/94 o 8.1 n 1.6
12/30/94 c 0 n 0
12/31/94 o 10.2 n 1.9
1/1/95 o 2.5 n 1.8
1/2/95 c 0 n 0
1/3/95 o 1.5 n 1.4
1/4/95 c 0 n 0
1/5/95 c 0 n 0
1/6/95 c 0 n 0
1/7/95 o 9.2 n 1.8
1/8/95 o 10.4 y 1.7
1/9/95 o 10.1 n 1.6
1/10/95 o 10.6 n 1.9
1/11/95 c 0 n 0
1/12/95 o 10.2 n 2.1
1/13/95 o 10.4 n 1.0
1/14/95 o 7.7 n 1.1
1/15/95 c 0 n 0
1/16/95 o 3.6 n 0
1/17/95 c 0 n 0
1/18/95 o 8.4 y 1.1
1/19/95 o 4.8 n 1.2
1/20/95 o 7.9 n 1.4
1/21/95 o 1.5 n 1.6
1/22/95 o 10.6 y 1.7
1/23/95 o 7.4 n 1.5
1/24/95 o 9.3 n 1.4
1/25/95 c 0 n 0
1/26/95 c 0 n 0
1/27/95 o 7.6 n 2
1/28/95 o 10.7 y 1.8
1/29/95 o 7.4 n 2.5
1/30/95 o 10.1 n 1.6
1/31/95 o 4.1 n 1.6
2/1/95 o 6.1 y 1.6
2/2/95 o 9.3 n 1.8
2/3/95 o 10.8 y 1.7
2/4/95 o 10.4 y 1.8
2/5/95 o 9.4 y 1.2
2/6/95 o 10.4 n 1.5
2/7/95 o 11.4 n 1.7
2/8/95 o 4.3 n 1.3
2/9/95 o 0.3 n 3.0
2/10/95 o 2.3 n 1.5
2/11/95 o 3.3 n 0
2/12/95 o 7.8 n 2.1
2/13/95 c 0 n 0
2/14/95 c 0 n 0
2/15/95 c 0 n 0
2/16/95 o 10.6 y 3.2
2/17/95 o 8.5 n 1.3
2/18/95 o 5.5 d 1.8
2/19/95 o 9.7 y 1.5
2/20/95 o 9.7 n 1.5
2/21/95 o 0 n 0
2/22/95 o 4.9 n 1.4
2/23/95 c 0 n 0
2/24/95 c 0 n 0
2/25/95 o 8.1 n 1.6
2/26/95 o 8.2 n 1.7
2/27/95 o 10.2 n 1.5
2/28/95 o 0 n 1.4
3/1/95 o 7.0 n 1.4
3/2/95 o 4.0 n 1.3
3/3/95 o 1.3 n 1.8
3/4/95 o 9.1 n 1.6
3/5/95 o 1.0 n 0
3/6/95 o 7.7 n 1.8
3/7/95 o 8.3 y 1.5
3/8/95 o 4.8 n 0
3/9/95 o 9.5 n 1.9
3/10/95 o 11 y 1.5
3/11/95 c 0 n 0
3/12/95 o 7.4 n 1.3
3/13/95 o 5.9 n 1.6
3/14/95 o 4.0 y 2.0
3/15/95 o 7.5 n 1.6 1.6
3/16/95 o 10.3 n 1.1 1.2
3/17/95 o 4.5 n 1.5
3/18/95 o 6 y 1.1 1.1
3/19/95 o 8.9 n 1.3 1.0
3/20/95 o 8.0 n 1.6
3/21/95 o 6.4 n 1.7
3/22/95 o 9 n 1.5
3/23/95 o 8.8 n 1.5
3/24/95 o 5 n 1.5
3/25/95 o 8.9 n 1.6 1.5
3/26/95 o 8 y 1.2
3/27/95 o 8.3 n 1.9
3/28/95 o 5.3 y 1.4
3/29/95 o 4.6 n 1.4
3/30/95 o 0.6 n 1.4
3/31/95 o 7.4 n 1.2
4/1/95 o 8.3 y 1.6
4/2/95 o 8.4 n 1.6
4/3/95 o 8.4 n 1.8
4/4/95 o 8.4 n 1.6
4/5/95 o 8.5 y 1.2 1.0
4/6/95 o 8.1 y 1.3 1.2
4/7/95 o 8.4 n 1.7
4/8/95 o 5.5 n 1.5
4/9/95 o 3.0 n 4.0
4/10/95 o 6.3 n 1.3
4/11/95 o 7.8 n 1.2
4/12/95 o 8.2 y 0
4/13/95 o 9.5 n 0
4/14/95 o 0.7 n 2.0 2.0
4/15/95 o 6 n 1.3 1.5
4/16/95 o 4.6 n 1.8 1.8
4/17/95 o 7.7 y 2.4 2.5
4/18/95 o 5.1 n 1.7 1.7
4/19/95 o 4.0 n 1.8
4/20/95 o 6.0 n 1.7 1.8
4/21/95 o 6.9 y 2.0
4/22/95 o 7.3 y 1.2
4/23/95 o 6.9 y 1.5
4/24/95 o 5.2 y 1.6
4/25/95 o 7.0 y 1.8
4/26/95 o 7.6 y 1.8
4/27/95 o 9.3 n 1.5
4/28/95 o 7.1 n 1.5
4/29/95 o 6 n 1.3
4/30/95 o 4.8 n 1.9
#
5/1/95 o 3.1 n 1.8
5/2/95 o 6 n 1.4
5/3/95 o 7.4 n 1.3
5/4/95 o 5.1 n 1.9
5/5/95 o 5.4 n 1.7
5/6/95 o 3.4 n 2.1
5/7/95 o 7.2 y 2.3
5/8/95 o 3.2 n 1.4
5/9/95 o 8.1 y 1.0
5/10/95 o 6.4 n 1.1
5/11/95 o 1.7 n 1.1
5/12/95 o 3.5 n 3.1
5/13/95 o 4.9 y 1.2
5/14/95 o 5.9 y 1.3 1.1
5/15/95 o 6.2 n 1.5 1.2
5/16/95 o 3.9 n 1.6
5/17/95 o 6.9 n 1.6 1.5
5/18/95 o 6.9 y 1.1 2.0
5/19/95 o 6.0 n 1.3
5/20/95 o 6.8 n 1.3
5/21/95 o 6.8 n 1.3 1.2
5/22/95 o 6.6 n 1.8
5/23/95 o 6.6 y 1.6 1.5
5/24/95 o 4.4 n 1.4
5/25/95 o 6.5 y 1.2
5/26/95 o 6.2 n 1.7
5/27/95 o 4.8 n 1.4
5/28/95 o 1.5 n 2.5
5/29/95 o 6.5 n 1.5
#
6/23/95 o 7.2 y 1.4
6/24/95 o 4.4 n 2.4
6/25/95 o 2.3 n 1.6
6/26/95 o 3.2 n 1.6
6/27/95 o 7.3 n 1.3
6/28/95 o 5.1 n 1.3
6/29/95 c 0 n 0
6/30/95 o 3.1 n 2.3
7/1/95 o 2.3 n 1.5
7/2/95 o 5.6 n 1.3
7/3/95 o 4.0 n 1.8
7/4/95 o 6.2 n 1.5
7/5/95 o 2.2 y 2.3
7/6/95 o 4.6 y 3.3
7/7/95 o 2.0 y 0
7/8/95 c 0 y 0
7/9/95 o 1.0 y 1.5
7/10/95 o 6.5 y 1.5
7/11/95 o 6.5 n 2.0
7/12/95 o 5.6 n 2.0
7/13/95 o 3.7 n 1.5
# problems with telescope drives start about now
#
7/17/95 c 0 n 0
7/18/95 o 1.9 n 1.2 1.2
7/19/95 o 0 n 0
7/20/95 o 0 n 2.5 2.5
7/21/95 o 6.8 n 1.9 2.0
7/22/95 o 5.7 n 1.5
7/23/95 o 5.8 y 1.5
7/24/95 o 5.4 y 1.6
7/25/95 o 1.4 y 1.6
7/26/95 o 8.2 y 1.9
7/27/95 o 6.9 n 1.8
7/28/95 o 1.0 n 1.9
7/29/95 o 5.0 n 0
7/30/95 o 2.5 n 0
7/31/95 c 0 n 0
8/1/95 c 0 n 0
8/2/95 c 0 n 0
8/3/95 o 4.7 n 2.4 2.4
8/4/95 o 5.0 n 1.7
8/5/95 o 2.1 n 1.1
8/6/95 o 7.2 n 1.7
8/7/95 o 7.3 n 1.6
#
8/9/95 c 0 n 0
8/10/95 c 0 n 0
8/11/95 o 1.7 n 2.1 2.1
8/12/95 o 7.1 n 2.2
8/13/95 o 2.5 n 1.3
8/14/95 c 0 n 0
8/15/95 o 0.5 n 0
8/16/95 c 0 n 0
8/17/95 c 0 n 0
8/18/95 o 2.0 n 1.6
8/19/95 c 0 n 0
8/20/95 o 4.8 d 1.7
8/21/95 o 5.8 n 1.5
8/22/95 o 5.7 n 1.5
8/23/95 o 7.9 n 2.0 1.7
8/24/95 o 6.1 n 2.3
8/25/95 o 6.5 n 1.6
8/26/95 o 5.5 n 2.0
8/27/95 o 6.7 n 2.2
8/28/95 o 6.0 n 2.1
8/29/95 o 8.2 y 2.0
8/30/95 o 4.3 n 2.0 2.0
8/31/95 o 9.2 y 1.8
9/1/95 o 7.6 n 1.8
9/2/95 o 6.4 y 1.3
9/3/95 o 6.3 y 1.7
9/4/95 o 7.5 y 1.1
9/5/95 o 8.5 n 1.4
9/6/95 o 7.3 n 1.3
9/7/95 o 1.5 n 1.4
9/8/95 o 1.8 n 0
9/9/95 c 0 n 0
9/10/95 o 0.5 n 0
9/11/95 o 8.1 n 1.2
9/12/95 o 8.3 n 1.4
9/13/95 o 3.9 n 1.7
9/14/95 c 0 n 0
9/15/95 c 0 n 0
9/16/95 o 5.4 n 1.2
9/17/95 o 1.0 n 1.2
9/18/95 o 2.0 n 1.8
9/19/95 o 3.9 n 1.4
9/20/95 o 8.6 y 1.4
9/21/95 o 0.3 n 1.9
9/22/95 o 9.1 n 1.7
9/23/95 o 5.7 n 1.6
9/24/95 o 7.0 n 1.4
9/25/95 o 6.6 n 1.4
9/26/95 o 9.3 n 1.6
9/27/95 o 8.3 n 1.5
9/28/95 o 6.5 n 1.8
9/29/95 o 9.3 y 1.8
9/30/95 o 9.2 y 1.1
10/01/95 o 9.4 n 1.4
10/02/95 o 9.4 y 1.4
10/03/95 o 9.5 y 1.4
10/04/95 o 5.1 n 2.4
10/05/95 o 7.0 y 1.3
10/06/95 o 8.5 y 1.0
10/07/95 o 8.5 n 1.8
10/08/95 o 9.1 n 1.9
10/09/95 o 9.7 y 0.0
10/10/95 o 9.3 y 1.5
10/11/95 o 9.8 y 1.8
10/12/95 o 8.8 y 2.0
10/13/95 o 10.6 y 1.5
10/14/95 o 9.5 y 1.4
10/15/95 o 9.9 n 1.9
10/16/95 o 8.3 n 1.3
10/17/95 o 9.8 y 1.5
10/18/95 o 9.9 y 1.9
10/19/95 o 10.0 y 2.5
10/20/95 o 8.5 y 1.4
10/21/95 o 9.8 n 1.5
10/22/95 o 5.0 n 2.6
# telescope down for tests here?
11/17/95 o 10.7 y 2.1
11/18/95 o 8.2 y 1.2
11/19/95 o 10.7 y 1.4 1.4
11/20/95 o 7.9 y 1.4
11/21/95 o 9.0 n 1.3
11/22/95 o 10.2 n 1.4 1.9
11/23/95 o 10.8 y 2.2
11/24/95 o 10.3 n 1.6
11/25/95 o 10.9 n 1.5
11/26/95 o 1.8 n 0
#
11/28/95 o 2.8 n 2.0
11/29/95 o 5.1 y 1.5 1.3
11/30/95 o 9.2 y 1.3
12/1/95 o 10.8 y 1.2
12/2/95 o 10.2 n 1.1
12/3/95 o 10.0 n 1.0
12/4/95 o 11 n 1.5
12/5/95 o 10.9 n 1.7
12/6/95 c 0 n 0
12/7/95 c 0 n 0
12/8/95 o 11 y 1.3
12/9/95 o 10.7 n 1.1
12/10/95 o 11.0 y 1.1
12/11/95 o 11.1 n 1.6 1.4
12/12/95 o 8.8 n 1.0 1.0
12/13/95 o 9.7 n 1.4
12/14/95 o 10.7 n 1.6
12/15/95 o 7.1 n 2.0
12/16/95 o 2.8 n 1.4
12/17/95 c 0 n 0
12/18/95 c 0 y 0
12/19/95 o 6.3 n 1.8
12/20/95 o 0 n 0
12/21/95 c 0 n 0
12/22/95 c 0 n 0
12/23/95 c 0 n 0
12/24/95 c 0 n 0
#
12/26/95 o 10.7 n 1.3
12/27/95 o 11.1 n 1.2
12/28/95 o 3.5 n 1.2
12/29/95 o 10.0 n 1.6
12/30/95 o 11.0 n 1.4
12/31/95 c 0 n 0
#
1/1/96 c 0 n 0
1/2/96 c 0 n 0
1/3/96 o 11.0 n 1.3
1/4/96 o 10.6 n 1.8
1/5/96 o 5.4 n 1.7
1/6/96 o 9.9 n 1.1
1/7/96 o 11.0 y 1.2
1/8/96 o 12.2 y 2.7
1/9/96 o 10.8 n 1.5
1/10/96 o 10.8 n 1.6
1/11/96 o 11.6 n 1.5
1/12/96 o 11.9 n 1.4
1/13/96 o 10.5 y 1.2
1/14/96 o 10.9 n 1.7
1/15/96 o 4.5 n 1.4
1/16/96 o 1.0 n 1.6
1/17/96 o 3.5 n 2.4
1/18/96 o 10.5 n 1.5
1/19/96 o 3.1 n 2.4
1/20/96 o 10.8 y 1.5
1/21/96 o 8.4 n 1.3
1/22/96 o 7.6 n 3.5
1/23/96 o 10.2 n 2.0
1/24/96 o 10.7 n 1.2 1.2
1/25/96 o 0.3 n 5.3
1/26/96 o 11.7 y 1.2
1/27/96 o 10.1 n 1.8
1/28/96 o 10.3 y 1.5
1/29/96 o 6.3 n 1.7
1/30/96 c 0 n 0
1/31/96 c 0 n 0
2/1/96 c 0 n 0
2/2/96 c 0 n 0
2/3/96 c 0 n 0
2/4/96 o 11.9 y 1.1
2/5/96 o 5.4 n 1.2
2/6/96 o 9.5 y 1.4
2/7/96 o 10.4 n 2.0 1.0
2/8/96 o 10.3 y 1.2
#
2/10/96 c 0 n 0
2/11/96 o 8.8 n 2.0
2/12/96 o 1 n 0
2/13/96 o 9.3 y 1.3
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