NATIONAL OPTICAL ASTRONOMY OBSERVATORIES
	CERRO TOLOLO INTER-AMERICAN OBSERVATORY
Meteorology Report		Month: April		Year: 1981
Date	Cloud cover	Photometric	Useful	Useless
1 - 2	0 - 0 - 0 - 0	*
2 - 3	0 - 0 - 0 - 0	*
3 - 4	0 - 0 - 0 - 0	*
4 - 5	2 - 2 - 2 - 2	*
5 - 6	3 - 3 - 1 - 1	1/2	1/2
6 - 7	4 - 4 - 4 - 4		1/2	1/2
7 - 8	0 - 0 - 0 - 0	*
8 - 9	4 - 7 - 7 - 7			*
9 - 10	4 - 2 - 1 - 1	1/2	1/2
10 - 11	0 - 0 - 0 - 0	*
11 - 12	0 - 0 - 0 - 0	*
12 - 13	0 - 2 - 3 - 3	1/2	1/2
13 - 14	3 - 2 - 4 - 2	1/2	1/2
14 - 15	2 - 3 - 3 - 2	1/2	1/2
15 - 16	3 - 4 - 4 - 4		1/2	1/2
16 - 17	0 - 0 - 0 - 0	*
17 - 18	0 - 0 - 0 - 0	*
18 - 19	0 - 0 - 0 - 0	*
19 - 20	0 - 0 - 0 - 0	*
20 - 21	3 - 2 - 4 - 6		1/2	1/2
21 - 22	8 - 2 - 8 - 7		1/2	1/2
22 - 23	8 - 8 - 8 - 8			*
23 - 24	8 - 8 - 8 - 8			*
24 - 25	7 - 6 - 8 - 8			*
25 - 26	8 - 8 - 7 - 7			*
26 - 27	8 - 8 - 2 - 2		1/2	1/2
27 - 28	3 - 2 - 0 - 0	1/2	1/2
28 - 29	4 - 4 - 0 - 0	1/2	1/2
29 - 30	3 - 3 - 3 - 3		*
30 - 01	7 - 3 - 2 - 0		*
	Totals	14.5	8	7.5
		Min.	Med.	Max.
Temperat. deg.F		40	55	77
Humidity % RH		10		100
Wind speed M/H			10 - 15	47
Water, precipitation	this month	00	tot.year:	00
			Report by: Oscar Saa