Caputa
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caputa clear sky chart from 2005-11-06 to 2024-11-01.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	7% 6% 2 5% 4 4 4 4 6% 8% 51%	101442
	Night	6% 6% 2 6% 4 4 4 4 6% 7% 51%	97732
Transparency	Day	29% 7% 15% 27% 17% 4	101186
	Night	31% 7% 15% 26% 17% 4	97578
Seeing	Day	10% 8% 26% 33% 18% 4	15906
	Night	9% 7% 29% 41% 13% 1	25850

By Month

Percentage Cloud Cover SW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	2 5% 2 7% 5% 5% 4 4 7% 8% 50%	2538
	11th to 20th	Day	2 7% 3 8% 6% 4 4 3 5% 8% 49%	2540
	21st to end	Day	2 6% 3 6% 5% 4 3 3 5% 8% 55%	2794
February	1st to 10th	Day	5% 10% 3 8% 6% 6% 5% 3 6% 7% 41%	1680
	11th to 20th	Day	5% 9% 4 6% 4 5% 5% 4 6% 8% 45%	1835
	21st to end	Day	5% 8% 3 8% 5% 4 5% 4 6% 7% 46%	1570
March	1st to 10th	Day	4 7% 2 5% 3 4 3 4 5% 8% 54%	3130
	11th to 20th	Day	7% 6% 2 3 3 3 3 3 6% 8% 57%	3242
	21st to end	Day	15% 10% 3 8% 4 4 4 3 6% 7% 35%	4165
April	1st to 10th	Day	12% 8% 2 5% 4 4 3 4 6% 8% 44%	2280
	11th to 20th	Day	12% 8% 2 6% 5% 4 5% 4 7% 7% 40%	2251
	21st to end	Day	12% 7% 2 6% 4 3 4 4 7% 8% 42%	2437
May	1st to 10th	Day	14% 9% 2 7% 4 4 5% 4 6% 6% 38%	4169
	11th to 20th	Day	10% 5% 2 5% 4 4 5% 4 7% 9% 46%	4388
	21st to end	Day	14% 6% 2 5% 5% 4 4 4 7% 8% 41%	4825
June	1st to 10th	Day	10% 4 2 4 4 4 4 3 7% 10% 48%	2660
	11th to 20th	Day	9% 4 1 5% 3 4 5% 4 7% 10% 49%	2660
	21st to end	Day	5% 3 1 4 3 3 4 3 6% 8% 60%	2660
July	1st to 10th	Day	4 3 1 4 4 4 5% 4 7% 10% 53%	4430
	11th to 20th	Day	3 2 1 4 4 3 5% 4 7% 10% 57%	4430
	21st to end	Day	3 3 1 3 3 3 4 4 7% 9% 60%	4802
August	1st to 10th	Day	6% 4 2 5% 4 4 5% 4 7% 10% 50%	4411
	11th to 20th	Day	5% 4 1 4 4 4 5% 5% 7% 9% 51%	3889
	21st to end	Day	5% 3 1 3 2 3 3 3 5% 7% 64%	4180
September	1st to 10th	Day	7% 4 1 4 2 2 2 3 4 7% 64%	2280
	11th to 20th	Day	7% 3 1 4 2 3 3 3 5% 6% 62%	2180
	21st to end	Day	9% 4 1 3 2 3 3 2 4 7% 62%	2090
October	1st to 10th	Day	11% 5% 2 4 4 3 3 3 5% 6% 55%	2021
	11th to 20th	Day	10% 4 1 4 3 3 4 3 4 6% 58%	1848
	21st to end	Day	7% 7% 1 5% 3 3 4 4 6% 8% 53%	1881
November	1st to 10th	Day	6% 5% 2 4 4 3 4 3 7% 9% 53%	1673
	11th to 20th	Day	4 6% 2 5% 3 4 5% 4 7% 6% 55%	1710
	21st to end	Day	4 8% 2 6% 4 3 3 4 6% 8% 52%	1553
December	1st to 10th	Day	3 8% 2 8% 4 4 4 3 6% 8% 51%	1520
	11th to 20th	Day	3 5% 2 5% 4 4 6% 4 5% 8% 54%	1926
	21st to end	Day	6% 10% 3 7% 5% 4 3 3 5% 6% 47%	2794
January	1st to 10th	Night	3 8% 3 9% 6% 5% 4 3 5% 6% 47%	4417
	11th to 20th	Night	2 6% 3 9% 6% 6% 5% 4 5% 7% 47%	4430
	21st to end	Night	2 5% 3 7% 5% 4 5% 4 6% 8% 54%	4873
February	1st to 10th	Night	6% 11% 3 8% 5% 4 4 4 5% 7% 43%	2518
	11th to 20th	Night	4 8% 3 8% 5% 5% 4 4 6% 7% 45%	2230
	21st to end	Night	5% 8% 3 7% 5% 3 3 4 7% 7% 48%	1884
March	1st to 10th	Night	6% 8% 3 7% 5% 4 4 4 5% 7% 49%	3734
	11th to 20th	Night	5% 7% 2 5% 4 3 4 3 5% 9% 53%	3724
	21st to end	Night	12% 9% 3 8% 4 4 5% 4 6% 7% 38%	3477
April	1st to 10th	Night	12% 7% 2 5% 5% 5% 4 4 5% 8% 44%	1900
	11th to 20th	Night	12% 7% 2 5% 4 4 4 3 7% 6% 44%	1877
	21st to end	Night	13% 6% 2 4 4 4 5% 4 7% 7% 45%	1743
May	1st to 10th	Night	13% 8% 2 7% 4 4 5% 4 6% 7% 42%	2798
	11th to 20th	Night	8% 4 1 4 3 4 4 4 6% 8% 53%	2517
	21st to end	Night	14% 6% 2 6% 5% 4 4 3 5% 7% 43%	2762
June	1st to 10th	Night	9% 4 1 5% 3 3 4 4 6% 9% 51%	1520
	11th to 20th	Night	10% 4 1 4 4 4 4 4 7% 9% 48%	1520
	21st to end	Night	7% 2 1 4 3 3 4 4 7% 8% 58%	1520
July	1st to 10th	Night	6% 3 1 4 4 3 4 4 7% 8% 56%	2540
	11th to 20th	Night	3 2 2 3 3 3 5% 4 7% 9% 59%	2540
	21st to end	Night	3 3 1 3 3 3 4 4 6% 8% 61%	2761
August	1st to 10th	Night	5% 4 2 6% 4 5% 5% 5% 7% 8% 49%	2528
	11th to 20th	Night	6% 4 2 4 4 4 4 4 7% 11% 52%	2945
	21st to end	Night	3 4 2 5% 3 4 4 3 4 7% 60%	3487
September	1st to 10th	Night	6% 3 1 3 2 3 4 3 4 6% 65%	1900
	11th to 20th	Night	7% 2 1 4 3 3 3 4 5% 7% 61%	1999
	21st to end	Night	10% 3 1 3 2 2 3 3 4 6% 63%	2090
October	1st to 10th	Night	12% 6% 1 4 3 3 4 3 4 6% 53%	2156
	11th to 20th	Night	9% 5% 2 4 3 3 4 2 5% 7% 56%	2313
	21st to end	Night	9% 7% 3 4 3 3 4 3 6% 8% 53%	2717
November	1st to 10th	Night	6% 6% 2 6% 3 4 4 4 7% 9% 50%	2412
	11th to 20th	Night	6% 7% 2 5% 3 4 4 3 5% 6% 55%	2470
	21st to end	Night	5% 6% 3 4 3 4 5% 4 6% 7% 54%	2626
December	1st to 10th	Night	4 7% 3 7% 4 3 3 4 6% 8% 52%	2660
	11th to 20th	Night	3 5% 2 5% 4 3 5% 4 6% 8% 54%	3271
	21st to end	Night	5% 11% 3 7% 4 4 4 3 5% 7% 47%	4873

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	29% 7% 21% 27% 14% 1	2539
	11th to 20th	Day	33% 6% 18% 27% 13% 3	2540
	21st to end	Day	26% 9% 19% 31% 14% 1	2794
February	1st to 10th	Day	41% 8% 15% 20% 13% 2	1680
	11th to 20th	Day	37% 8% 16% 21% 14% 5%	1845
	21st to end	Day	35% 7% 16% 25% 14% 4	1570
March	1st to 10th	Day	27% 6% 13% 25% 24% 5%	3130
	11th to 20th	Day	25% 6% 18% 36% 14% 1	3242
	21st to end	Day	45% 10% 19% 21% 6%	4165
April	1st to 10th	Day	36% 7% 18% 26% 11% 3	2280
	11th to 20th	Day	40% 8% 14% 23% 13% 2	2254
	21st to end	Day	38% 8% 17% 26% 10%	2437
May	1st to 10th	Day	42% 8% 14% 23% 11% 2	4169
	11th to 20th	Day	31% 9% 15% 29% 13% 3	4392
	21st to end	Day	37% 9% 17% 25% 11% 1	4825
June	1st to 10th	Day	29% 9% 21% 26% 13% 2	2660
	11th to 20th	Day	28% 8% 20% 24% 16% 3	2660
	21st to end	Day	20% 6% 15% 30% 22% 6%	2660
July	1st to 10th	Day	24% 6% 12% 32% 23% 2	4361
	11th to 20th	Day	20% 5% 12% 30% 23% 8%	4355
	21st to end	Day	17% 6% 12% 26% 28% 11%	4651
August	1st to 10th	Day	27% 7% 18% 21% 20% 7%	4396
	11th to 20th	Day	25% 9% 16% 28% 17% 5%	3928
	21st to end	Day	20% 4 10% 26% 27% 13%	4179
September	1st to 10th	Day	22% 4 9% 28% 27% 10%	2280
	11th to 20th	Day	23% 5% 12% 27% 26% 8%	2180
	21st to end	Day	23% 4 9% 34% 26% 4	2090
October	1st to 10th	Day	30% 6% 12% 24% 23% 5%	2021
	11th to 20th	Day	28% 4 11% 30% 21% 5%	1848
	21st to end	Day	29% 6% 17% 28% 15% 5%	1881
November	1st to 10th	Day	26% 6% 16% 25% 19% 7%	1673
	11th to 20th	Day	27% 7% 13% 27% 21% 5%	1710
	21st to end	Day	29% 5% 15% 30% 17% 4	1553
December	1st to 10th	Day	30% 8% 16% 26% 17% 2	1520
	11th to 20th	Day	26% 8% 17% 34% 13% 2	1924
	21st to end	Day	38% 4 11% 28% 17% 2	2794
January	1st to 10th	Night	36% 7% 11% 32% 13% 1	4417
	11th to 20th	Night	36% 8% 14% 26% 14% 2	4430
	21st to end	Night	27% 8% 19% 29% 15% 2	4873
February	1st to 10th	Night	39% 8% 15% 22% 14% 2	2518
	11th to 20th	Night	37% 7% 15% 25% 13% 4	2230
	21st to end	Night	33% 7% 16% 25% 13% 6%	1884
March	1st to 10th	Night	33% 6% 13% 24% 22% 2	3734
	11th to 20th	Night	27% 7% 19% 27% 19% 1	3724
	21st to end	Night	42% 9% 22% 20% 6% 1	3477
April	1st to 10th	Night	38% 7% 15% 23% 15% 3	1900
	11th to 20th	Night	38% 7% 14% 23% 15% 3	1877
	21st to end	Night	36% 8% 17% 25% 13% 1	1743
May	1st to 10th	Night	38% 9% 13% 23% 14% 3	2798
	11th to 20th	Night	25% 8% 18% 37% 10% 1	2518
	21st to end	Night	38% 8% 14% 27% 12% 1	2762
June	1st to 10th	Night	29% 9% 19% 26% 15% 2	1520
	11th to 20th	Night	30% 10% 20% 22% 15% 3	1520
	21st to end	Night	21% 8% 16% 28% 21% 5%	1520
July	1st to 10th	Night	24% 5% 17% 25% 25% 3	2500
	11th to 20th	Night	20% 5% 16% 31% 22% 7%	2492
	21st to end	Night	19% 6% 14% 30% 24% 7%	2674
August	1st to 10th	Night	30% 7% 17% 19% 20% 7%	2520
	11th to 20th	Night	27% 8% 18% 24% 20% 4	2972
	21st to end	Night	24% 5% 12% 24% 27% 8%	3487
September	1st to 10th	Night	21% 4 10% 28% 28% 9%	1900
	11th to 20th	Night	22% 5% 13% 26% 27% 7%	1999
	21st to end	Night	24% 4 8% 29% 26% 9%	2090
October	1st to 10th	Night	32% 6% 12% 23% 20% 7%	2156
	11th to 20th	Night	29% 5% 11% 26% 22% 7%	2313
	21st to end	Night	30% 6% 16% 23% 19% 7%	2717
November	1st to 10th	Night	30% 6% 15% 22% 19% 7%	2412
	11th to 20th	Night	29% 6% 12% 26% 21% 6%	2470
	21st to end	Night	28% 6% 15% 26% 20% 4	2626
December	1st to 10th	Night	31% 6% 14% 29% 17% 3	2660
	11th to 20th	Night	26% 6% 16% 35% 15% 2	3272
	21st to end	Night	37% 6% 12% 30% 13% 2	4873

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	4 7% 26% 33% 24% 6%	270
	11th to 20th	Day	10% 10% 28% 37% 11% 4	270
	21st to end	Day	5% 11% 39% 34% 8% 2	297
February	1st to 10th	Day	12% 11% 38% 30% 9%	270
	11th to 20th	Day	11% 11% 31% 36% 10% 1	270
	21st to end	Day	8% 12% 37% 30% 9% 3	225
March	1st to 10th	Day	8% 11% 34% 27% 16% 3	270
	11th to 20th	Day	9% 9% 29% 36% 14% 2	277
	21st to end	Day	18% 13% 31% 25% 10% 2	506
April	1st to 10th	Day	15% 14% 35% 27% 8% 1	460
	11th to 20th	Day	17% 18% 35% 23% 6% 1	452
	21st to end	Day	16% 12% 27% 32% 13% 1	617
May	1st to 10th	Day	15% 10% 28% 28% 16% 3	653
	11th to 20th	Day	19% 7% 25% 27% 19% 3	675
	21st to end	Day	15% 7% 30% 28% 16% 4	734
June	1st to 10th	Day	8% 5% 22% 34% 27% 6%	680
	11th to 20th	Day	10% 7% 30% 36% 16% 2	680
	21st to end	Day	8% 6% 23% 37% 22% 4	680
July	1st to 10th	Day	6% 3 19% 39% 29% 5%	671
	11th to 20th	Day	3 3 21% 44% 26% 3	668
	21st to end	Day	5% 3 18% 40% 29% 5%	739
August	1st to 10th	Day	5% 3 19% 42% 26% 5%	676
	11th to 20th	Day	4 3 20% 44% 22% 6%	570
	21st to end	Day	4 6% 19% 36% 27% 8%	539
September	1st to 10th	Day	7% 3 25% 34% 22% 8%	490
	11th to 20th	Day	9% 3 21% 33% 27% 8%	390
	21st to end	Day	14% 8% 25% 26% 20% 7%	300
October	1st to 10th	Day	17% 6% 21% 30% 17% 9%	300
	11th to 20th	Day	14% 10% 32% 23% 16% 6%	300
	21st to end	Day	11% 16% 27% 28% 15% 2	330
November	1st to 10th	Day	9% 12% 34% 30% 10% 5%	270
	11th to 20th	Day	10% 12% 29% 30% 17% 3	270
	21st to end	Day	11% 7% 28% 36% 15% 2	270
December	1st to 10th	Day	6% 11% 34% 34% 11% 3	270
	11th to 20th	Day	10% 7% 35% 38% 9% 1	270
	21st to end	Day	11% 12% 30% 31% 13% 2	297
January	1st to 10th	Night	6% 8% 28% 42% 14% 2	950
	11th to 20th	Night	7% 12% 31% 38% 11% 2	950
	21st to end	Night	7% 9% 37% 38% 9%	1045
February	1st to 10th	Night	11% 9% 35% 35% 9%	808
	11th to 20th	Night	8% 6% 36% 40% 10% 1	744
	21st to end	Night	9% 4 37% 41% 9% 1	628
March	1st to 10th	Night	10% 6% 35% 38% 10%	760
	11th to 20th	Night	8% 6% 30% 43% 11% 1	731
	21st to end	Night	15% 11% 26% 41% 8% 1	627
April	1st to 10th	Night	16% 6% 33% 37% 8%	570
	11th to 20th	Night	15% 10% 36% 33% 6%	563
	21st to end	Night	16% 8% 28% 36% 12%	570
May	1st to 10th	Night	15% 6% 26% 38% 14% 1	570
	11th to 20th	Night	14% 7% 21% 41% 16% 1	561
	21st to end	Night	16% 7% 31% 35% 11% 1	617
June	1st to 10th	Night	10% 4 28% 39% 18% 1	570
	11th to 20th	Night	11% 6% 32% 42% 9%	570
	21st to end	Night	6% 5% 24% 49% 14%	570
July	1st to 10th	Night	5% 2 23% 46% 23% 1	555
	11th to 20th	Night	4 2 20% 55% 19% 1	552
	21st to end	Night	4 1 19% 58% 18%	624
August	1st to 10th	Night	5% 3 20% 54% 18% 1	567
	11th to 20th	Night	5% 2 19% 50% 23% 1	564
	21st to end	Night	5% 2 20% 48% 23% 1	627
September	1st to 10th	Night	6% 4 22% 47% 19% 2	570
	11th to 20th	Night	7% 3 23% 47% 19% 1	570
	21st to end	Night	11% 7% 25% 40% 17% 1	570
October	1st to 10th	Night	14% 7% 23% 38% 17% 1	636
	11th to 20th	Night	11% 6% 28% 39% 14% 1	793
	21st to end	Night	13% 8% 29% 37% 11% 1	1045
November	1st to 10th	Night	10% 7% 30% 41% 10% 2	928
	11th to 20th	Night	9% 7% 32% 39% 12% 1	950
	21st to end	Night	7% 9% 33% 41% 9%	950
December	1st to 10th	Night	7% 8% 36% 38% 10%	950
	11th to 20th	Night	8% 5% 31% 44% 12% 1	950
	21st to end	Night	12% 10% 30% 38% 10%	1045

Page generated at 2024-10-29 09:20:47. Version ac07

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