OBSERVING STATISTICS
January - December 2001
	Clear Nights*	Photometric Nights	Number of Observation Hours	Average Nocturnal Temperture (ºC)	Average Nocturnal Wind Speed (m/s)	Average Nocturnal Humidity (%)
January	6	1	73.2	-2.1	7.57	64.5
February	14	7	154.6	1.8	5.76	59.9
March	11	3	117.2	4.3	7.88	57.1
April	13	4	130.4	3.6	5.57	66.8
May	10	7	94.0	9.9	4.15	59.1
June	26	11	177.0	13.8	5.03	43.9
July	19	16	155.3	14.5	5.34	45.8
August	24	11	206.7	15.2	4.64	53.7
September	18	4	180.0	12.0	4.44	66.9
October	17	7	193.3	8.4	6.22	67.6
November	9	5	120.4	2.4	4.39	70.1
Dicember	11	5	129.0	1.9	3.46	36.5
Total number of clear nights from January 1 to December 31, 2001: 178
*A clear night is when the sky is 70% clear for more than 6 hours
Comments and suggestions to H. Frahm (frahm@caha.es)

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