NATIONAL OPTICAL ASTRONOMY OBSERVATORIES
	CERRO TOLOLO INTER-AMERICAN OBSERVATORY
Meteorology Report		Month: May		Year: 1981
Date	Cloud cover	Photometric	Useful	Useless
1 - 2	1 - 4 - 4 - 7		1/2	1/2
2 - 3	8 - 8 - 8 - 8			*
3 - 4	1 - 0 - 0 - 5	*
4 - 5	6 - 3 - 2 - 0		*
5 - 6	0 - 0 - 0 - 0	*
6 - 7	0 - 0 - 0 - 0	*
7 - 8	5 - 6 - 4 - 6			*
8 - 9	8 - 8 - 8 - 8			*
9 - 10	5 - 5 - 8 - 8			*
10 - 11	7 - 2 - 2 - 2		*
11 - 12	8 - 8 - 8 - 8			*
12 - 13	8 - 7 - 4 - 1		*
13 - 14	0 - 0 - 0 - 0	*
14 - 15	0 - 0 - 0 - 0	*
15 - 16	1 - 0 - 0 - 0	*
16 - 17	0 - 1 - 3 - 6		*
17 - 18	5 - 6 - 4 - 5		1/2	1/2
18 - 19	5 - 5 - 7 - 8		1/2	1/2
19 - 20	0 - 0 - 0 - 0	*
20 - 21	3 - 2 - 0 - 0	*
21 - 22	1 - 1 - 4 - 5		*
22 - 23	5 - 3 - 3 - 3		*
23 - 24	0 - 0 - 0 - 0	*
24 - 25	4 - 4 - 5 - 6			*
25 - 26	6 - 6 - 7 - 7			*
26 - 27	3 - 1 - 1 - 4			*
27 - 28	0 - 0 - 0 - 0	*
28 - 29	0 - 0 - 0 - 0	*
29 - 30	1 - 4 - 5 - 1		*
30 - 31	1 - 3 - 8 - 8		1/2	1/2
31 - 1	8 - 8 - 5 - 5			*
	Totals	11	9	11
		Min.	Med.	Max.
Temperat. deg.F		31	50	72
Humidity % RH		10		100
Wind speed M/H			15 - 20	60
Water, precipitation	this month	30.5	tot.year:	30.5
			Report by: Oscar Saa