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 2025-05-11.

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% 52%	117643
	Night	6% 6% 2 6% 4 4 4 4 5% 7% 51%	120158
Transparency	Day	29% 6% 14% 27% 18% 4	117387
	Night	31% 6% 14% 26% 19% 4	120004
Seeing	Day	10% 8% 27% 33% 18% 4	16550
	Night	9% 7% 29% 41% 13% 1	26654

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 8% 5% 10% 6% 5% 4 4 6% 8% 43%	3638
	11th to 20th	Day	2 7% 4 9% 6% 5% 5% 3 5% 7% 48%	3640
	21st to end	Day	1 4 2 5% 5% 4 4 4 5% 8% 59%	4004
February	1st to 10th	Day	5% 10% 3 9% 6% 6% 5% 3 6% 7% 41%	1769
	11th to 20th	Day	5% 10% 4 7% 4 5% 4 4 6% 8% 45%	1935
	21st to end	Day	4 7% 3 7% 4 4 5% 4 6% 7% 47%	1650
March	1st to 10th	Day	5% 8% 2 6% 3 4 3 3 4 7% 54%	4500
	11th to 20th	Day	7% 6% 2 3 3 3 3 3 5% 7% 58%	4652
	21st to end	Day	15% 11% 3 7% 4 4 4 3 5% 8% 37%	5969
April	1st to 10th	Day	12% 8% 2 5% 4 3 3 4 6% 8% 45%	2400
	11th to 20th	Day	12% 8% 2 6% 5% 4 5% 4 7% 8% 41%	2371
	21st to end	Day	13% 7% 2 6% 4 3 4 4 7% 8% 41%	2565
May	1st to 10th	Day	13% 9% 2 7% 4 4 5% 4 6% 6% 39%	4301
	11th to 20th	Day	10% 5% 2 5% 4 4 5% 4 7% 9% 46%	4390
	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	7% 3 1 2 2 2 2 2 3 5% 71%	3363
	11th to 20th	Day	8% 4 1 3 3 3 3 3 3 6% 63%	3061
	21st to end	Day	8% 7% 2 5% 4 4 4 4 6% 8% 51%	3091
November	1st to 10th	Day	6% 5% 2 5% 4 3 4 3 7% 9% 53%	1763
	11th to 20th	Day	4 6% 2 4 3 4 5% 4 7% 6% 55%	1800
	21st to end	Day	4 7% 2 6% 4 3 4 4 6% 8% 52%	1634
December	1st to 10th	Day	2 6% 3 8% 4 4 4 3 6% 7% 54%	2620
	11th to 20th	Day	2 4 2 6% 4 4 7% 4 6% 8% 52%	3026
	21st to end	Day	5% 9% 3 7% 6% 4 3 3 6% 6% 48%	4004
January	1st to 10th	Night	6% 11% 4 10% 5% 5% 4 3 4 5% 43%	6327
	11th to 20th	Night	2 7% 4 10% 6% 5% 5% 3 5% 6% 48%	6340
	21st to end	Night	1 4 2 6% 5% 4 4 3 5% 6% 60%	6974
February	1st to 10th	Night	6% 11% 4 8% 5% 5% 4 4 5% 7% 42%	2650
	11th to 20th	Night	4 8% 3 8% 5% 5% 5% 4 6% 7% 45%	2350
	21st to end	Night	5% 8% 3 7% 4 3 3 4 7% 7% 49%	1980
March	1st to 10th	Night	6% 8% 3 6% 4 4 3 3 5% 6% 52%	5374
	11th to 20th	Night	4 6% 2 5% 4 4 4 4 6% 9% 52%	5323
	21st to end	Night	13% 9% 3 7% 4 4 5% 4 6% 8% 37%	4984
April	1st to 10th	Night	12% 7% 2 5% 4 5% 4 4 5% 8% 44%	2000
	11th to 20th	Night	12% 7% 2 5% 4 4 4 3 7% 6% 45%	1977
	21st to end	Night	13% 6% 2 4 4 4 5% 4 7% 7% 45%	1834
May	1st to 10th	Night	12% 8% 2 6% 4 4 5% 4 6% 7% 42%	2886
	11th to 20th	Night	8% 4 1 4 3 4 4 4 6% 8% 53%	2521
	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	7% 3 1 3 2 2 2 2 3 4 71%	3598
	11th to 20th	Night	7% 5% 2 4 3 3 4 3 5% 7% 59%	3836
	21st to end	Night	9% 6% 2 4 3 3 4 3 6% 7% 53%	4467
November	1st to 10th	Night	6% 6% 2 6% 3 4 4 4 6% 9% 50%	2535
	11th to 20th	Night	6% 7% 2 5% 3 4 4 3 5% 6% 55%	2600
	21st to end	Night	4 6% 3 5% 3 4 5% 4 6% 7% 54%	2765
December	1st to 10th	Night	3 6% 2 6% 4 3 3 4 6% 8% 54%	4570
	11th to 20th	Night	3 6% 2 6% 5% 4 5% 4 6% 8% 49%	5181
	21st to end	Night	5% 9% 3 8% 5% 4 5% 4 5% 7% 45%	6974

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	38% 6% 17% 26% 12% 1	3639
	11th to 20th	Day	35% 5% 16% 23% 18% 2	3640
	21st to end	Day	23% 7% 14% 34% 17% 4	4004
February	1st to 10th	Day	41% 8% 15% 20% 13% 3	1769
	11th to 20th	Day	37% 7% 15% 20% 15% 4	1945
	21st to end	Day	34% 7% 16% 25% 15% 4	1650
March	1st to 10th	Day	30% 4 10% 26% 26% 4	4500
	11th to 20th	Day	25% 5% 14% 32% 22% 1	4652
	21st to end	Day	45% 8% 16% 21% 10%	5969
April	1st to 10th	Day	36% 7% 17% 26% 11% 3	2400
	11th to 20th	Day	39% 8% 14% 22% 15% 2	2374
	21st to end	Day	39% 8% 17% 26% 10%	2565
May	1st to 10th	Day	41% 8% 14% 24% 11% 2	4301
	11th to 20th	Day	31% 9% 15% 29% 13% 3	4394
	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	18% 4 9% 21% 31% 17%	3363
	11th to 20th	Day	25% 3 11% 36% 23% 3	3061
	21st to end	Day	32% 5% 14% 30% 15% 5%	3091
November	1st to 10th	Day	27% 6% 16% 24% 20% 7%	1763
	11th to 20th	Day	27% 6% 13% 26% 22% 6%	1800
	21st to end	Day	29% 5% 15% 31% 16% 4	1634
December	1st to 10th	Day	29% 5% 19% 28% 17% 1	2620
	11th to 20th	Day	29% 6% 18% 31% 14% 1	3024
	21st to end	Day	36% 4 10% 33% 16% 1	4004
January	1st to 10th	Night	44% 5% 9% 27% 13% 1	6327
	11th to 20th	Night	38% 6% 13% 22% 18% 4	6340
	21st to end	Night	25% 6% 14% 29% 23% 3	6974
February	1st to 10th	Night	40% 8% 14% 21% 14% 2	2650
	11th to 20th	Night	38% 7% 15% 24% 13% 4	2350
	21st to end	Night	32% 7% 15% 26% 14% 6%	1980
March	1st to 10th	Night	32% 5% 10% 26% 24% 4	5374
	11th to 20th	Night	28% 6% 17% 26% 23% 1	5323
	21st to end	Night	43% 7% 19% 19% 10% 1	4984
April	1st to 10th	Night	38% 6% 15% 23% 15% 3	2000
	11th to 20th	Night	37% 7% 14% 23% 17% 3	1977
	21st to end	Night	36% 8% 17% 26% 12% 1	1834
May	1st to 10th	Night	38% 9% 13% 24% 14% 2	2886
	11th to 20th	Night	25% 8% 18% 37% 10% 1	2522
	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	19% 4 8% 20% 30% 19%	3598
	11th to 20th	Night	26% 4 11% 31% 24% 5%	3836
	21st to end	Night	31% 4 13% 26% 18% 8%	4467
November	1st to 10th	Night	30% 6% 15% 22% 20% 7%	2535
	11th to 20th	Night	29% 6% 12% 25% 22% 6%	2600
	21st to end	Night	29% 6% 15% 27% 19% 4	2765
December	1st to 10th	Night	27% 5% 17% 31% 17% 3	4570
	11th to 20th	Night	32% 6% 18% 30% 12% 2	5182
	21st to end	Night	38% 5% 10% 31% 15% 1	6974

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	5% 7% 25% 34% 23% 5%	300
	11th to 20th	Day	10% 9% 31% 35% 11% 3	300
	21st to end	Day	5% 13% 37% 34% 9% 2	330
February	1st to 10th	Day	12% 13% 38% 29% 8%	300
	11th to 20th	Day	11% 10% 34% 35% 9% 1	300
	21st to end	Day	8% 13% 36% 30% 10% 2	249
March	1st to 10th	Day	8% 12% 32% 29% 16% 3	300
	11th to 20th	Day	9% 10% 31% 34% 13% 2	308
	21st to end	Day	17% 15% 31% 24% 10% 2	550
April	1st to 10th	Day	15% 14% 36% 26% 7% 1	500
	11th to 20th	Day	17% 18% 34% 24% 6% 1	492
	21st to end	Day	17% 12% 26% 32% 12% 1	665
May	1st to 10th	Day	15% 9% 27% 29% 17% 3	703
	11th to 20th	Day	19% 7% 25% 28% 19% 3	676
	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% 35% 29% 10% 5%	300
	11th to 20th	Day	9% 13% 29% 30% 16% 3	300
	21st to end	Day	11% 7% 29% 36% 15% 2	300
December	1st to 10th	Day	6% 12% 34% 34% 11% 3	300
	11th to 20th	Day	10% 7% 35% 38% 8% 1	300
	21st to end	Day	11% 12% 29% 32% 14% 2	330
January	1st to 10th	Night	7% 8% 28% 42% 13% 2	1000
	11th to 20th	Night	7% 12% 32% 37% 10% 2	1000
	21st to end	Night	6% 9% 37% 38% 9%	1100
February	1st to 10th	Night	10% 10% 36% 35% 9%	850
	11th to 20th	Night	7% 6% 36% 40% 10% 1	784
	21st to end	Night	8% 4 38% 40% 9% 1	660
March	1st to 10th	Night	10% 6% 35% 39% 10%	800
	11th to 20th	Night	8% 7% 30% 43% 11% 1	769
	21st to end	Night	15% 11% 26% 41% 7% 1	660
April	1st to 10th	Night	16% 7% 33% 37% 8%	600
	11th to 20th	Night	15% 10% 36% 34% 6%	593
	21st to end	Night	15% 9% 28% 36% 12%	600
May	1st to 10th	Night	14% 6% 26% 38% 14% 1	600
	11th to 20th	Night	14% 7% 21% 41% 16% 1	563
	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% 9% 2	975
	11th to 20th	Night	9% 9% 32% 38% 12% 1	1000
	21st to end	Night	7% 9% 32% 42% 9%	1000
December	1st to 10th	Night	7% 9% 36% 38% 10%	1000
	11th to 20th	Night	8% 6% 31% 44% 11% 1	1000
	21st to end	Night	12% 10% 30% 38% 10%	1100

Page generated at 2025-05-08 07:34:00. Version ac07

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