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 2026-09-14.

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% 5% 2 5% 4 4 4 4 6% 8% 51%	158089
	Night	6% 6% 2 6% 4 4 4 4 6% 7% 51%	150528
Transparency	Day	30% 6% 14% 27% 19% 5%	152852
	Night	31% 6% 14% 26% 18% 4	146777
Seeing	Day	10% 8% 27% 33% 18% 4	18540
	Night	9% 7% 30% 41% 12% 1	28395

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	3 8% 4 9% 5% 4 5% 4 6% 8% 44%	4720
	11th to 20th	Day	2 6% 3 9% 6% 5% 5% 4 5% 8% 46%	4740
	21st to end	Day	2 5% 2 7% 5% 4 4 4 6% 8% 54%	5188
February	1st to 10th	Day	5% 10% 3 8% 6% 6% 5% 3 6% 7% 42%	1858
	11th to 20th	Day	4 10% 4 6% 4 5% 4 4 6% 8% 45%	2035
	21st to end	Day	4 7% 3 7% 4 4 5% 4 6% 8% 47%	1730
March	1st to 10th	Day	5% 8% 2 6% 3 4 3 3 4 7% 55%	4600
	11th to 20th	Day	7% 6% 2 3 3 3 3 3 5% 8% 58%	4754
	21st to end	Day	15% 10% 3 7% 4 4 4 3 5% 8% 37%	6101
April	1st to 10th	Day	12% 8% 2 4 4 3 3 4 6% 8% 44%	2520
	11th to 20th	Day	11% 8% 2 6% 5% 4 5% 4 7% 8% 41%	2491
	21st to end	Day	14% 7% 2 6% 4 3 4 4 6% 8% 40%	2693
May	1st to 10th	Day	9% 6% 2 5% 3 4 5% 4 6% 7% 48%	7742
	11th to 20th	Day	14% 5% 2 5% 3 3 4 3 6% 8% 48%	8191
	21st to end	Day	15% 5% 2 5% 4 4 4 4 6% 8% 44%	9026
June	1st to 10th	Day	9% 4 2 4 4 4 4 4 7% 10% 49%	2940
	11th to 20th	Day	9% 4 1 5% 3 4 5% 4 7% 10% 49%	2940
	21st to end	Day	6% 3 1 4 3 3 4 3 6% 8% 59%	2940
July	1st to 10th	Day	4 3 1 5% 4 4 5% 5% 8% 11% 49%	8249
	11th to 20th	Day	6% 2 1 3 3 3 4 4 6% 9% 59%	8250
	21st to end	Day	7% 3 1 4 3 4 4 4 7% 10% 53%	8957
August	1st to 10th	Day	6% 3 1 4 3 3 4 4 7% 10% 55%	8142
	11th to 20th	Day	8% 4 2 4 3 4 5% 4 7% 10% 49%	7306
	21st to end	Day	7% 4 2 4 3 3 4 4 7% 10% 53%	7751
September	1st to 10th	Day	7% 3 1 4 2 2 2 3 4 7% 64%	2520
	11th to 20th	Day	8% 3 1 4 2 3 3 4 5% 6% 60%	2332
	21st to end	Day	8% 4 1 3 3 3 3 2 4 7% 62%	2200
October	1st to 10th	Day	6% 3 1 2 3 2 2 2 3 5% 70%	3469
	11th to 20th	Day	9% 4 1 3 3 3 3 3 3 6% 62%	3158
	21st to end	Day	7% 7% 2 5% 4 3 4 4 6% 7% 51%	3190
November	1st to 10th	Day	6% 5% 2 5% 4 3 4 4 7% 9% 52%	1853
	11th to 20th	Day	4 6% 2 4 3 4 5% 4 6% 6% 55%	1890
	21st to end	Day	4 7% 2 6% 4 3 4 4 6% 8% 52%	1715
December	1st to 10th	Day	2 6% 3 8% 4 4 4 3 6% 7% 53%	2700
	11th to 20th	Day	2 4 2 6% 4 4 7% 4 6% 8% 52%	3106
	21st to end	Day	5% 9% 3 7% 6% 4 4 3 6% 6% 49%	4092
January	1st to 10th	Night	6% 11% 4 10% 5% 4 4 3 5% 6% 43%	8201
	11th to 20th	Night	2 5% 3 9% 5% 5% 5% 4 6% 7% 47%	8250
	21st to end	Night	1 4 3 8% 5% 4 4 3 5% 6% 56%	9026
February	1st to 10th	Night	6% 10% 3 8% 5% 4 4 4 5% 7% 43%	2782
	11th to 20th	Night	4 8% 3 8% 5% 5% 5% 4 6% 7% 46%	2470
	21st to end	Night	5% 8% 3 6% 4 3 3 4 7% 7% 49%	2076
March	1st to 10th	Night	6% 8% 3 6% 4 4 3 3 5% 6% 52%	5494
	11th to 20th	Night	5% 6% 2 5% 4 4 4 4 6% 9% 51%	5441
	21st to end	Night	13% 9% 3 7% 4 4 5% 4 6% 8% 37%	5094
April	1st to 10th	Night	13% 7% 2 5% 4 5% 4 4 5% 8% 44%	2100
	11th to 20th	Night	12% 7% 2 5% 4 4 4 4 7% 7% 45%	2077
	21st to end	Night	13% 7% 2 5% 4 4 5% 4 7% 7% 45%	1926
May	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 6% 7% 49%	5189
	11th to 20th	Night	11% 5% 2 5% 4 4 4 4 6% 6% 50%	4701
	21st to end	Night	16% 7% 2 5% 3 4 4 3 5% 7% 44%	5181
June	1st to 10th	Night	9% 5% 1 5% 3 3 4 4 6% 9% 51%	1680
	11th to 20th	Night	10% 4 1 4 4 4 4 4 7% 9% 47%	1680
	21st to end	Night	8% 3 1 4 3 3 4 4 7% 7% 56%	1680
July	1st to 10th	Night	6% 4 1 5% 4 3 4 4 7% 9% 54%	4740
	11th to 20th	Night	5% 2 1 3 3 3 4 3 6% 9% 61%	4740
	21st to end	Night	8% 4 2 5% 4 4 5% 5% 6% 9% 49%	5152
August	1st to 10th	Night	5% 3 1 4 3 4 4 4 6% 7% 59%	4680
	11th to 20th	Night	7% 4 2 5% 3 4 4 4 7% 9% 51%	5532
	21st to end	Night	6% 5% 2 6% 4 4 5% 4 6% 8% 51%	6465
September	1st to 10th	Night	6% 3 1 3 2 3 4 3 4 6% 65%	2100
	11th to 20th	Night	7% 3 2 4 3 3 3 4 5% 7% 59%	2134
	21st to end	Night	10% 3 1 3 2 2 3 3 4 6% 63%	2200
October	1st to 10th	Night	7% 3 1 3 2 2 2 2 3 4 71%	3712
	11th to 20th	Night	7% 5% 2 4 3 3 4 3 5% 7% 59%	3958
	21st to end	Night	9% 6% 2 4 3 3 4 3 6% 7% 53%	4610
November	1st to 10th	Night	6% 7% 2 6% 3 4 4 4 6% 8% 50%	2665
	11th to 20th	Night	6% 7% 2 6% 3 4 4 3 5% 6% 54%	2730
	21st to end	Night	5% 6% 3 5% 3 4 5% 4 6% 7% 53%	2903
December	1st to 10th	Night	3 6% 3 6% 4 3 4 4 6% 8% 54%	4710
	11th to 20th	Night	3 6% 2 6% 5% 4 5% 4 6% 8% 49%	5321
	21st to end	Night	5% 9% 3 8% 5% 4 4 4 5% 7% 45%	7128

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	36% 5% 17% 27% 13% 1	4723
	11th to 20th	Day	35% 5% 15% 24% 18% 3	4740
	21st to end	Day	28% 6% 14% 31% 18% 3	5188
February	1st to 10th	Day	41% 7% 15% 20% 14% 3	1858
	11th to 20th	Day	37% 7% 15% 21% 16% 4	2045
	21st to end	Day	33% 7% 16% 26% 15% 4	1730
March	1st to 10th	Day	30% 4 10% 26% 26% 4	4600
	11th to 20th	Day	25% 5% 14% 32% 22% 1	4754
	21st to end	Day	44% 8% 16% 21% 10%	6101
April	1st to 10th	Day	36% 7% 17% 26% 11% 3	2520
	11th to 20th	Day	38% 8% 13% 22% 16% 3	2494
	21st to end	Day	40% 8% 17% 25% 10%	2693
May	1st to 10th	Day	33% 6% 12% 30% 18% 1	7742
	11th to 20th	Day	33% 6% 12% 25% 20% 4	8195
	21st to end	Day	36% 7% 13% 25% 17% 1	9027
June	1st to 10th	Day	29% 8% 20% 27% 13% 2	2940
	11th to 20th	Day	28% 8% 20% 24% 17% 4	2940
	21st to end	Day	22% 6% 15% 29% 21% 7%	2940
July	1st to 10th	Day	26% 6% 15% 30% 21% 2	8181
	11th to 20th	Day	21% 5% 12% 27% 22% 13%	8175
	21st to end	Day	25% 6% 15% 27% 21% 6%	8759
August	1st to 10th	Day	22% 6% 14% 22% 24% 12%	6446
	11th to 20th	Day	32% 9% 19% 23% 14% 4	5760
	21st to end	Day	19% 5% 19% 28% 21% 9%	6078
September	1st to 10th	Day	21% 4 9% 29% 27% 10%	2520
	11th to 20th	Day	24% 5% 12% 26% 25% 8%	2332
	21st to end	Day	23% 4 9% 34% 26% 5%	2200
October	1st to 10th	Day	19% 4 9% 21% 31% 17%	3469
	11th to 20th	Day	25% 3 11% 36% 22% 3	3158
	21st to end	Day	31% 5% 14% 31% 15% 5%	3190
November	1st to 10th	Day	27% 6% 17% 25% 19% 7%	1853
	11th to 20th	Day	27% 6% 13% 26% 22% 5%	1890
	21st to end	Day	29% 5% 15% 31% 16% 4	1715
December	1st to 10th	Day	30% 5% 19% 28% 17% 1	2700
	11th to 20th	Day	29% 6% 18% 31% 14% 2	3104
	21st to end	Day	36% 3 10% 33% 16% 1	4092
January	1st to 10th	Night	43% 5% 11% 29% 11% 1	8202
	11th to 20th	Night	35% 5% 16% 25% 16% 3	8250
	21st to end	Night	29% 5% 13% 27% 23% 2	9026
February	1st to 10th	Night	39% 7% 14% 23% 14% 2	2782
	11th to 20th	Night	36% 7% 14% 24% 15% 4	2470
	21st to end	Night	31% 7% 15% 27% 15% 5%	2076
March	1st to 10th	Night	32% 5% 10% 26% 24% 4	5494
	11th to 20th	Night	28% 6% 16% 26% 23% 1	5441
	21st to end	Night	43% 7% 19% 19% 10% 1	5094
April	1st to 10th	Night	39% 6% 15% 23% 14% 3	2100
	11th to 20th	Night	36% 7% 13% 23% 18% 3	2077
	21st to end	Night	37% 8% 16% 25% 13% 1	1926
May	1st to 10th	Night	32% 7% 11% 27% 21% 1	5190
	11th to 20th	Night	32% 6% 14% 29% 17% 2	4702
	21st to end	Night	39% 6% 12% 26% 16% 1	5182
June	1st to 10th	Night	29% 9% 19% 26% 16% 2	1680
	11th to 20th	Night	31% 10% 19% 22% 15% 3	1680
	21st to end	Night	23% 8% 16% 27% 20% 5%	1680
July	1st to 10th	Night	26% 5% 18% 28% 21% 2	4700
	11th to 20th	Night	20% 4 14% 26% 21% 14%	4692
	21st to end	Night	31% 6% 15% 27% 17% 4	5038
August	1st to 10th	Night	23% 5% 14% 21% 26% 11%	3700
	11th to 20th	Night	31% 8% 23% 20% 15% 3	4354
	21st to end	Night	24% 5% 20% 26% 19% 6%	5069
September	1st to 10th	Night	21% 4 11% 29% 27% 9%	2100
	11th to 20th	Night	24% 5% 14% 25% 26% 7%	2134
	21st to end	Night	24% 4 8% 30% 26% 9%	2200
October	1st to 10th	Night	19% 4 8% 21% 30% 19%	3712
	11th to 20th	Night	27% 4 11% 31% 24% 5%	3958
	21st to end	Night	31% 4 13% 26% 19% 8%	4610
November	1st to 10th	Night	31% 6% 15% 23% 20% 6%	2665
	11th to 20th	Night	29% 6% 13% 25% 21% 5%	2730
	21st to end	Night	29% 6% 15% 27% 19% 3	2903
December	1st to 10th	Night	28% 5% 17% 31% 17% 3	4710
	11th to 20th	Night	32% 6% 18% 30% 12% 2	5322
	21st to end	Night	38% 5% 10% 31% 15% 1	7128

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	6% 7% 27% 33% 21% 5%	330
	11th to 20th	Day	12% 10% 31% 34% 11% 3	330
	21st to end	Day	6% 13% 37% 34% 8% 2	363
February	1st to 10th	Day	11% 12% 38% 30% 8%	330
	11th to 20th	Day	11% 10% 34% 35% 9% 2	330
	21st to end	Day	8% 13% 38% 29% 10% 2	273
March	1st to 10th	Day	9% 11% 32% 29% 15% 3	330
	11th to 20th	Day	10% 10% 33% 33% 12% 2	338
	21st to end	Day	17% 15% 32% 24% 9% 2	594
April	1st to 10th	Day	16% 15% 36% 26% 7% 1	540
	11th to 20th	Day	17% 19% 34% 23% 6% 1	532
	21st to end	Day	19% 12% 26% 31% 12% 1	713
May	1st to 10th	Day	14% 10% 28% 29% 17% 3	753
	11th to 20th	Day	20% 8% 25% 27% 17% 2	775
	21st to end	Day	15% 8% 30% 28% 16% 4	844
June	1st to 10th	Day	8% 5% 24% 32% 25% 5%	780
	11th to 20th	Day	11% 7% 31% 35% 15% 2	780
	21st to end	Day	9% 7% 24% 35% 21% 4	780
July	1st to 10th	Day	5% 3 18% 40% 29% 5%	771
	11th to 20th	Day	4 3 20% 44% 26% 2	768
	21st to end	Day	6% 4 17% 40% 29% 4	849
August	1st to 10th	Day	5% 4 20% 42% 25% 4	776
	11th to 20th	Day	5% 3 20% 43% 23% 6%	660
	21st to end	Day	5% 6% 21% 36% 26% 7%	627
September	1st to 10th	Day	7% 4 26% 35% 21% 7%	570
	11th to 20th	Day	9% 4 23% 32% 24% 8%	438
	21st to end	Day	13% 8% 26% 27% 19% 8%	330
October	1st to 10th	Day	16% 7% 21% 30% 18% 8%	330
	11th to 20th	Day	15% 11% 32% 22% 15% 5%	330
	21st to end	Day	11% 16% 28% 28% 15% 2	363
November	1st to 10th	Day	9% 13% 34% 29% 10% 5%	330
	11th to 20th	Day	9% 13% 29% 30% 16% 2	330
	21st to end	Day	11% 7% 28% 35% 16% 3	330
December	1st to 10th	Day	7% 12% 35% 33% 11% 3	330
	11th to 20th	Day	12% 8% 34% 38% 8% 1	330
	21st to end	Day	10% 13% 30% 32% 13% 2	363
January	1st to 10th	Night	7% 8% 29% 42% 13% 2	1050
	11th to 20th	Night	8% 13% 32% 36% 10% 1	1050
	21st to end	Night	6% 9% 38% 38% 9%	1155
February	1st to 10th	Night	10% 10% 37% 35% 9%	892
	11th to 20th	Night	7% 6% 36% 41% 9% 1	824
	21st to end	Night	8% 4 39% 39% 9% 1	692
March	1st to 10th	Night	10% 6% 35% 39% 10%	840
	11th to 20th	Night	9% 6% 31% 42% 11% 1	807
	21st to end	Night	14% 11% 26% 41% 7% 1	693
April	1st to 10th	Night	16% 7% 33% 37% 8%	630
	11th to 20th	Night	15% 10% 36% 34% 5%	623
	21st to end	Night	16% 8% 28% 37% 11%	630
May	1st to 10th	Night	14% 6% 26% 40% 13% 1	630
	11th to 20th	Night	14% 8% 23% 39% 15% 1	621
	21st to end	Night	16% 7% 32% 34% 11% 1	683
June	1st to 10th	Night	10% 5% 30% 39% 16% 1	630
	11th to 20th	Night	11% 6% 33% 41% 9%	630
	21st to end	Night	8% 6% 26% 47% 13%	630
July	1st to 10th	Night	5% 2 23% 48% 21% 1	615
	11th to 20th	Night	4 2 21% 54% 18% 1	612
	21st to end	Night	4 2 19% 57% 17%	690
August	1st to 10th	Night	4 3 22% 52% 17%	627
	11th to 20th	Night	6% 2 19% 51% 21% 1	624
	21st to end	Night	5% 2 21% 49% 22% 1	693
September	1st to 10th	Night	6% 4 22% 48% 18% 1	630
	11th to 20th	Night	7% 3 24% 45% 19% 1	609
	21st to end	Night	11% 7% 24% 41% 17% 1	600
October	1st to 10th	Night	14% 6% 23% 39% 17% 1	670
	11th to 20th	Night	12% 7% 28% 39% 13% 1	835
	21st to end	Night	12% 8% 29% 37% 11% 1	1100
November	1st to 10th	Night	11% 7% 31% 41% 9% 2	1025
	11th to 20th	Night	9% 8% 32% 38% 12% 1	1050
	21st to end	Night	8% 9% 32% 42% 9%	1050
December	1st to 10th	Night	7% 9% 37% 37% 10%	1050
	11th to 20th	Night	8% 6% 32% 43% 10% 1	1050
	21st to end	Night	12% 10% 31% 38% 9%	1155

Page generated at 2026-09-11 02:11:58. Version ac07

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