NATIONAL OPTICAL ASTRONOMY OBSERVATORIES
CERRO TOLOLO INTER-AMERICAN OBSERVATORY
Meteorology Report Month: May Year: 1983
Date Cloud cover Photometric Useful Useless
1 - 2 0 - 0 - 0 - 0 *    
2 - 3 1 - 2 - 5 - 5   *  
3 - 4 0 - 0 - 0 - 0 *    
4 - 5 0 - 0 - 0 - 0 *    
5 - 6 7 - 5 - 7 - 7     *
6 - 7 3 - 4 - 6 - 7   *  
7 - 8 2 - 1 - 6 - 8   *  
8 - 9 2 - 2 - 2 - 2   *  
9 - 10 2 - 2 - 1 - 1   *  
10 - 11 1 - 0 - 0 - 0 *    
11 - 12 0 - 0 - 0 - 0 *    
12 - 13 0 - 0 - 0 - 0 *    
13 - 14 0 - 2 - 5 - 5   *  
14 - 15 8 - 8 - 7 - 8     *
15 - 16 0 - 0 - 0 - 0 *1/2   *1/2
16 - 17 8 - 8 - 8 - 8     *
17 - 18 8 - 8 - 8 - 8     *
18 - 19 8 - 8 - 8 - 8     *
19 - 20 5 - 7 - 7 - 7   *1/2 *1/2
20 - 21 7 - 3 - 2 - 2   *1/2 *1/2
21 - 22 0 - 5 - 5 - 1   *  
22 - 23 0 - 1 - 1 - 0   *  
23 - 24 0 - 1 - 0 - 0   *  
24 - 25 1 - 3 - 6 - 6   *  
25 - 26 8 - 8 - 8 - 8     *
26 - 27 1 - 2 - 5 - 8   *  
27 - 28 2 - 7 - 8 - 8     *
28 - 29 0 - 0 - 1 - 2   *  
29 - 30 0 - 0 - 0 - 0   *  
30 - 31 0 - 0 - 0 - 0 *    
31 - 01 0 - 1 - 7 - 8   *  
Totals 7.5 15 8.5
Min. Med. Max.
Temperat. deg.F   37 53 73
Humidity % RH   10 35 100
Wind speed M/H   00 15 66
Water, precipitation this month 5.9 tot.year: 11.9
Report by: Oscar Saa