La Silla Monthly Weather Report (Jan 1991 - May 1999)

Legend

  • MN#: Month number
  • PN : Photometric Nights
  • SN : Spectroscopic Nights
  • UN : Useless Nights
  • %Photo : percentage of photometric nights
  • %Spect : percentage of spectroscopic nights
  • %Useless : percentage of useless nights

Month	MN#	PN	SN	UN	%Photo	%Spec	%Useless

							
Jan-91	1	25.30	2.30	3.50	81.35	7.40	11.25
Feb-91	2	26.30	1.50	0.30	93.59	5.34	1.07
Mar-91	3	27.30	3.50	0.30	87.78	11.25	0.96
Apr-91	4	17.00	9.80	3.30	56.48	32.56	10.96
May-91	5	8.50	13.50	9.00	27.42	43.55	29.03
Jun-91	6	8.60	12.30	8.80	28.96	41.41	29.63
Jul-91	7	8.50	12.00	10.50	27.42	38.71	33.87
Aug-91	8	9.90	13.10	8.00	31.94	42.26	25.80
Sep-91	9	11.00	12.00	7.00	36.67	40.00	23.33
Oct-91	10	19.60	7.30	4.30	62.82	23.40	13.78
Nov-91	11	17.30	9.00	3.80	57.48	29.90	12.62
Dec-91	12	13.30	14.80	3.30	42.36	47.13	10.51
Jan-92	13	14.50	13.80	2.80	46.62	44.37	9.00
Feb-92	14	23.80	5.00	0.30	81.79	17.18	1.03
Mar-92	15	19.30	5.00	6.70	62.26	16.13	21.61
Apr-92	16	11.30	9.50	9.30	37.54	31.56	30.90
May-92	17	7.00	14.00	9.00	23.33	46.67	30.00
Jun-92	18	7.60	11.60	11.00	25.17	38.41	36.42
Jul-92	19	12.00	10.00	9.00	38.71	32.26	29.03
Aug-92	20	9.90	13.10	8.00	31.94	42.26	25.81
Sep-92	21	23.00	4.50	2.50	76.67	15.00	8.33
Oct-92	22	15.30	8.80	7.00	49.20	28.30	22.51
Nov-92	23	15.60	9.60	4.80	52.00	32.00	16.00
Dec-92	24	23.50	3.80	3.80	75.56	12.22	12.22
Jan-93	25	23.50	4.80	2.80	75.56	15.43	9.00
Feb-93	26	21.30	6.80	0.00	75.80	24.20	0.00
Mar-93	27	24.80	5.50	0.80	79.74	17.68	2.57
Apr-93	28	10.50	12.00	7.50	35.00	40.00	25.00
May-93	29	9.30	12.80	9.00	29.90	41.16	28.94
Jun-93	30	6.80	16.50	6.70	22.67	55.00	22.33
Jul-93	31	14.50	10.80	5.80	46.62	34.73	18.65
Aug-93	32	15.30	9.00	6.80	49.20	28.94	21.86
Sep-93	33	17.00	6.80	6.30	56.48	22.59	20.93
Oct-93	34	16.30	8.50	6.30	52.41	27.33	20.26
Nov-93	35	16.00	5.80	1.30	69.26	25.11	5.63
Dec-93	36	26.80	4.30	0.00	86.17	13.83	0.00
Jan-94	37	22.00	1.50	1.50	88.00	6.00	6.00
Feb-94	38	25.00	3.00	0.00	89.29	10.71	0.00
Mar-94	39	20.00	8.50	2.50	64.52	27.42	8.06
Apr-94	40	10.30	12.80	7.00	34.22	42.52	23.26
May-94	41	13.30	9.30	8.50	42.77	29.90	27.33
Jun-94	42	10.00	14.00	6.00	33.33	46.67	20.00
Jul-94	43	13.30	11.00	6.80	42.77	35.37	21.86
Aug-94	44	16.80	3.30	11.00	54.02	10.61	35.37
Sep-94	45	14.00	10.00	6.00	46.67	33.33	20.00
Oct-94	46	19.00	9.80	2.20	61.29	31.61	7.09
Nov-94	47	26.80	2.20	1.00	89.00	7.00	3.00
Dec-94	48	19.50	9.00	2.50	62.90	30.00	8.06
Jan-95	49	15.30	5.50	3.30	49.35	17.74	10.64
Feb-95	50	17.30	3.80	0.00	61.78	13.57	0.00
Mar-95	51	19.80	10.00	1.20	63.87	32.26	3.87
Apr-95	52	22.50	4.50	3.00	75.00	15.00	10.00
May-95	53	12.75	12.00	6.25	41.13	38.71	20.16
Jun-95	54	10.00	14.50	5.50	33.33	48.33	18.33
Jul-95	55	14.75	11.00	5.25	47.58	35.48	16.94
Aug-95	56	21.25	8.25	1.50	68.55	26.61	4.84
Sep-95	57	15.75	5.75	8.50	52.50	19.17	28.33
Oct-95	58	22.25	3.00	5.75	71.77	9.68	18.55
Nov-95	59	24.75	3.50	1.75	82.50	11.67	5.83
Dec-95  60	18.50   6.75    1.75    68.52   25.00   6.48
Jan-96  61	30.25   0.75    0.00    97.58   2.42    0.00
Feb-96  62	28.75   0.25    0.00    99.14   0.86    0.00
Mar-96  63	27.00   2.50    1.50    87.10   8.06    4.84
Apr-96  64	21.50   3.00    5.50    71.67   10.00   18.33
May-96  65	17.25   7.00    6.75    55.65   22.58   21.77
Jun-96  66	8.25	13.25   8.50    27.50   44.17   28.33
Jul-96  67	17.00	12.00   2.00    54.84   38.71    6.45
Aug-96  68	22.00	4.00    5.00    70.97   12.90   16.13
Sep-96  69	20.00	9.25    0.75    66.67   30.83    2.50 
Oct-96  70	25.50	5.00    0.50    82.26   16.13    1.61
Nov-96  71	27.00   3.00    0.00    90.00   10.00    0.00
Dec-96  72	28.25   2.25    0.50    91.00    7.00    2.00
Jan-97  73	28.25   2.75    0.00    91.13    8.87    0.00 
Feb-97  74	22.00   6.00    0.00    78.57   21.43    0.00 
Mar-97  75	25.50   4.50    1.00    82.26   14.52    3.22
Apr-97  76	28.25   1.75    0.00    94.17    5.83    0.00
May-97  77	15.75   6.75    8.50    50.81   21.77   27.42
Jun-97  78	14.00   3.70   12.30    46.67   12.33   41.00
Jul-97  79	14.40   7.90    8.70    46.45   25.48   28.06
Aug-97  80	16.00   2.90   12.10    51.62    9.35   39.03 
Sep-97  81	18.50   4.90    6.60    61.67   16.33   22.00
Oct-97  82	14.50   9.50    7.00    46.77   30.65   22.58
Nov-97  83	26.00   0.60    3.40    86.67    2.00   11.33
Dec-97  84	21.70   8.00    1.30    70.00   25.81    4.19
Jan-98  85	28.00   3.00    0.00    90.32    9.68    0.00
Feb-98  86	18.00   4.10    5.90    64.29   14.64   21.07
Mar-98  87	18.30   6.70    6.00    59.03   21.61   19.35
Apr-98  88	11.70   6.90   11.40    39.00   23.00   38.00
May-98  89	13.00   5.90   12.10    41.94   19.03   39.03
Jun-98  90	10.00   6.20   13.80    33.33   20.67   46.00
Jul-98  91	17.60   2.50   10.90    56.77    8.06   35.17
Aug-98  92	18.70   6.30    6.00    60.32   20.32   19.36
Sep-98  93	24.40   2.30    3.30    81.33    7.67   11.00
Oct-98  94	26.80   2.20    2.00    86.45    7.10    6.45
Nov-98  95	26.80   3.20    0.00    89.33   10.67    0.00
Dec-98  96	29.30   1.40    0.30    94.51    4.52    0.97
Jan-99  97	28.90   1.50    0.60    93.23    4.84    1.93
Feb-99  98	24.90   2.80    0.30    88.93   10.00    1.07
Mar-99  99	28.90   0.00    2.10    93.23    0.00    6.77
Apr-99 100	26.00   1.00    4.00    86.67    3.33   10.00
May-99 101	21.90   3.10    6.00    70.65   10.00   19.35