ZEC Kisskissink
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the ZEC Kisskissink clear sky chart from 2005-11-06 to 2026-08-15.

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	17% 13% 5% 11% 6% 5% 5% 4 5% 6% 24%	143894
	Night	15% 14% 5% 12% 7% 6% 5% 4 4 5% 22%	138047
Transparency	Day	60% 6% 10% 15% 7% 1	147315
	Night	63% 6% 10% 15% 6%	142716
Seeing	Day	27% 18% 31% 17% 6% 1	17374
	Night	25% 15% 31% 22% 7% 1	25794

By Month

Percentage Cloud Cover NE (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	9% 19% 9% 20% 8% 6% 6% 4 4 4 11%	4661
	11th to 20th	Day	7% 16% 8% 24% 12% 7% 7% 3 4 3 9%	4650
	21st to end	Day	4 9% 6% 20% 9% 7% 7% 5% 7% 5% 20%	5124
February	1st to 10th	Day	7% 15% 6% 15% 11% 8% 8% 4 4 5% 16%	1687
	11th to 20th	Day	11% 17% 7% 15% 7% 7% 6% 4 5% 4 17%	1965
	21st to end	Day	10% 17% 6% 13% 8% 6% 6% 4 4 5% 22%	1730
March	1st to 10th	Day	13% 21% 6% 14% 6% 4 4 3 4 3 23%	4576
	11th to 20th	Day	12% 17% 6% 16% 5% 6% 5% 3 4 4 20%	4756
	21st to end	Day	12% 18% 5% 12% 5% 4 4 3 4 5% 28%	6090
April	1st to 10th	Day	20% 19% 6% 10% 5% 4 3 2 3 5% 22%	2520
	11th to 20th	Day	19% 15% 4 9% 4 3 4 3 5% 5% 30%	2571
	21st to end	Day	20% 14% 4 10% 5% 5% 4 3 4 5% 26%	2730
May	1st to 10th	Day	22% 14% 3 9% 5% 5% 5% 4 5% 6% 22%	8135
	11th to 20th	Day	21% 10% 4 9% 5% 5% 5% 4 5% 7% 25%	8221
	21st to end	Day	19% 11% 4 8% 6% 5% 5% 4 5% 6% 27%	9177
June	1st to 10th	Day	22% 9% 3 8% 5% 5% 4 4 6% 7% 27%	3150
	11th to 20th	Day	21% 8% 3 7% 5% 5% 5% 4 6% 8% 29%	3150
	21st to end	Day	24% 8% 3 7% 7% 5% 5% 4 6% 7% 24%	3150
July	1st to 10th	Day	17% 8% 3 8% 5% 5% 6% 5% 7% 8% 29%	8445
	11th to 20th	Day	16% 8% 3 8% 5% 5% 6% 5% 6% 8% 30%	8280
	21st to end	Day	16% 8% 3 8% 5% 6% 6% 5% 7% 8% 29%	8993
August	1st to 10th	Day	17% 7% 3 8% 6% 5% 6% 5% 8% 9% 25%	4703
	11th to 20th	Day	20% 8% 3 8% 5% 5% 6% 4 7% 8% 25%	4335
	21st to end	Day	19% 10% 4 9% 5% 4 4 4 5% 6% 30%	4420
September	1st to 10th	Day	19% 10% 2 7% 5% 5% 4 4 5% 7% 32%	2400
	11th to 20th	Day	18% 10% 2 6% 4 3 4 4 5% 7% 36%	2269
	21st to end	Day	23% 12% 3 6% 5% 4 4 3 5% 6% 30%	2200
October	1st to 10th	Day	20% 13% 5% 7% 5% 4 4 4 5% 6% 27%	2125
	11th to 20th	Day	25% 19% 5% 9% 5% 4 3 3 4 5% 18%	1858
	21st to end	Day	26% 21% 5% 7% 4 3 3 3 4 5% 19%	1980
November	1st to 10th	Day	19% 22% 7% 11% 5% 4 4 3 3 3 19%	1851
	11th to 20th	Day	20% 21% 8% 13% 6% 4 3 2 2 4 18%	1782
	21st to end	Day	19% 24% 8% 16% 8% 3 2 2 3 4 11%	1512
December	1st to 10th	Day	14% 19% 8% 17% 13% 6% 5% 3 3 2 9%	2350
	11th to 20th	Day	15% 17% 5% 16% 10% 7% 6% 3 4 4 12%	2688
	21st to end	Day	14% 18% 7% 16% 10% 7% 5% 3 4 4 12%	3660
January	1st to 10th	Night	10% 20% 9% 18% 9% 8% 6% 3 3 3 9%	8234
	11th to 20th	Night	7% 18% 9% 23% 14% 7% 4 2 3 2 10%	8235
	21st to end	Night	4 8% 6% 16% 11% 10% 9% 6% 7% 5% 17%	9057
February	1st to 10th	Night	8% 14% 6% 13% 9% 9% 7% 4 5% 5% 20%	2929
	11th to 20th	Night	9% 18% 7% 16% 8% 7% 5% 4 4 4 18%	2540
	21st to end	Night	9% 17% 5% 13% 7% 6% 6% 4 5% 6% 22%	2076
March	1st to 10th	Night	15% 17% 5% 14% 8% 5% 5% 5% 4 5% 18%	5484
	11th to 20th	Night	12% 16% 5% 12% 8% 7% 6% 4 5% 6% 19%	5423
	21st to end	Night	13% 15% 5% 13% 6% 6% 4 3 5% 5% 25%	5083
April	1st to 10th	Night	20% 19% 5% 10% 5% 4 4 2 3 4 24%	2100
	11th to 20th	Night	20% 14% 4 7% 5% 4 3 3 5% 6% 29%	1998
	21st to end	Night	18% 14% 4 9% 6% 4 4 3 5% 5% 30%	1890
May	1st to 10th	Night	21% 11% 3 8% 5% 5% 4 4 5% 5% 30%	4805
	11th to 20th	Night	22% 12% 4 8% 4 4 4 3 5% 7% 27%	4639
	21st to end	Night	21% 11% 3 7% 4 4 4 4 5% 6% 30%	5000
June	1st to 10th	Night	19% 9% 3 9% 6% 3 5% 3 4 7% 31%	1470
	11th to 20th	Night	18% 8% 3 7% 5% 4 5% 4 6% 8% 32%	1470
	21st to end	Night	19% 10% 3 8% 5% 5% 4 4 5% 9% 29%	1470
July	1st to 10th	Night	15% 9% 3 8% 5% 5% 6% 5% 7% 8% 29%	4505
	11th to 20th	Night	17% 9% 3 7% 5% 5% 5% 4 6% 8% 31%	4680
	21st to end	Night	17% 8% 3 7% 5% 4 5% 4 5% 8% 36%	5084
August	1st to 10th	Night	15% 7% 3 7% 4 5% 7% 5% 7% 7% 34%	2666
	11th to 20th	Night	19% 9% 2 8% 5% 5% 5% 4 6% 8% 30%	2769
	21st to end	Night	18% 8% 3 7% 5% 4 5% 4 5% 6% 34%	3477
September	1st to 10th	Night	19% 7% 3 6% 4 3 4 3 5% 7% 38%	2000
	11th to 20th	Night	19% 8% 3 7% 3 4 5% 3 5% 7% 37%	2130
	21st to end	Night	18% 10% 3 8% 4 4 4 3 4 5% 38%	2200
October	1st to 10th	Night	19% 11% 3 7% 5% 4 4 3 4 5% 34%	2273
	11th to 20th	Night	24% 16% 4 7% 4 5% 4 3 4 6% 23%	2541
	21st to end	Night	25% 19% 5% 8% 5% 5% 3 3 4 5% 19%	2860
November	1st to 10th	Night	19% 18% 7% 11% 6% 5% 3 3 4 4 19%	2667
	11th to 20th	Night	18% 18% 7% 12% 6% 5% 4 3 4 5% 18%	2835
	21st to end	Night	19% 21% 7% 16% 7% 5% 4 2 3 4 11%	3107
December	1st to 10th	Night	12% 17% 9% 21% 12% 6% 4 3 3 3 11%	5060
	11th to 20th	Night	17% 18% 6% 14% 9% 6% 4 3 3 3 15%	5741
	21st to end	Night	15% 20% 7% 15% 8% 6% 5% 3 3 4 15%	7549

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	78% 4 6% 10% 2	4662
	11th to 20th	Day	80% 4 6% 6% 5%	4680
	21st to end	Day	62% 5% 6% 16% 10%	5124
February	1st to 10th	Day	71% 4 6% 11% 7% 1	1687
	11th to 20th	Day	71% 3 8% 10% 7% 1	1974
	21st to end	Day	65% 4 7% 16% 5% 2	1730
March	1st to 10th	Day	66% 4 6% 11% 10% 3	4579
	11th to 20th	Day	66% 5% 9% 11% 8% 1	4756
	21st to end	Day	60% 3 5% 14% 15% 3	6090
April	1st to 10th	Day	66% 4 9% 11% 8% 2	2520
	11th to 20th	Day	56% 5% 8% 17% 12% 2	2571
	21st to end	Day	60% 4 9% 14% 11% 2	2730
May	1st to 10th	Day	59% 7% 9% 14% 10% 1	8147
	11th to 20th	Day	56% 8% 10% 18% 7% 1	8225
	21st to end	Day	56% 7% 9% 14% 12% 2	9178
June	1st to 10th	Day	56% 6% 9% 19% 8% 2	3150
	11th to 20th	Day	51% 8% 12% 18% 9% 2	3150
	21st to end	Day	58% 7% 10% 14% 9%	3150
July	1st to 10th	Day	49% 8% 14% 22% 8%	8375
	11th to 20th	Day	48% 9% 16% 23% 4	8205
	21st to end	Day	50% 10% 15% 21% 5%	8795
August	1st to 10th	Day	51% 10% 18% 18% 4	4689
	11th to 20th	Day	53% 10% 19% 15% 3	4377
	21st to end	Day	54% 6% 13% 16% 10%	4420
September	1st to 10th	Day	50% 7% 16% 21% 6%	2400
	11th to 20th	Day	47% 6% 17% 22% 7%	2269
	21st to end	Day	55% 6% 14% 18% 7%	2200
October	1st to 10th	Day	56% 7% 12% 20% 5%	3463
	11th to 20th	Day	66% 5% 12% 15% 2	2996
	21st to end	Day	64% 6% 15% 13% 2	3180
November	1st to 10th	Day	70% 6% 9% 11% 4	1851
	11th to 20th	Day	73% 4 8% 10% 4 1	1782
	21st to end	Day	80% 4 8% 7% 1	1512
December	1st to 10th	Day	82% 4 5% 8% 1	2350
	11th to 20th	Day	75% 5% 5% 11% 3	2688
	21st to end	Day	77% 3 5% 9% 6%	3660
January	1st to 10th	Night	81% 4 6% 8% 1	8234
	11th to 20th	Night	82% 4 5% 7% 3	8280
	21st to end	Night	65% 6% 7% 14% 9%	9057
February	1st to 10th	Night	67% 5% 6% 14% 8% 1	2929
	11th to 20th	Night	71% 3 8% 11% 5% 1	2542
	21st to end	Night	64% 4 8% 15% 8% 1	2076
March	1st to 10th	Night	69% 5% 6% 10% 9%	5494
	11th to 20th	Night	64% 7% 11% 11% 7%	5424
	21st to end	Night	60% 5% 6% 18% 9% 2	5083
April	1st to 10th	Night	65% 4 8% 14% 8% 2	2100
	11th to 20th	Night	57% 5% 9% 18% 9% 1	1998
	21st to end	Night	57% 5% 8% 19% 10% 1	1890
May	1st to 10th	Night	53% 8% 9% 19% 10% 1	4811
	11th to 20th	Night	54% 8% 11% 19% 7%	4640
	21st to end	Night	53% 6% 10% 15% 13% 3	5001
June	1st to 10th	Night	53% 6% 9% 21% 9% 1	1470
	11th to 20th	Night	48% 8% 14% 17% 10% 3	1470
	21st to end	Night	52% 8% 13% 17% 10%	1470
July	1st to 10th	Night	49% 9% 15% 20% 7%	4465
	11th to 20th	Night	49% 8% 19% 21% 4	4632
	21st to end	Night	47% 8% 17% 23% 5%	4967
August	1st to 10th	Night	48% 9% 19% 18% 7%	2656
	11th to 20th	Night	50% 9% 20% 16% 4	2793
	21st to end	Night	48% 8% 14% 23% 7%	3477
September	1st to 10th	Night	46% 7% 15% 24% 8%	2000
	11th to 20th	Night	47% 7% 18% 23% 5%	2130
	21st to end	Night	51% 6% 13% 24% 6%	2200
October	1st to 10th	Night	53% 6% 14% 21% 5% 1	3715
	11th to 20th	Night	61% 5% 13% 18% 3	4142
	21st to end	Night	64% 6% 12% 12% 5%	4610
November	1st to 10th	Night	69% 6% 9% 11% 4	2667
	11th to 20th	Night	71% 5% 9% 11% 3	2835
	21st to end	Night	80% 4 8% 7% 2	3107
December	1st to 10th	Night	80% 4 6% 7% 2	5060
	11th to 20th	Night	75% 3 5% 13% 3	5742
	21st to end	Night	75% 3 6% 11% 5%	7549

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	22% 18% 44% 14% 3	220
	11th to 20th	Day	20% 22% 35% 16% 7%	220
	21st to end	Day	18% 18% 36% 22% 5% 1	242
February	1st to 10th	Day	18% 28% 38% 12% 3 1	225
	11th to 20th	Day	23% 24% 33% 16% 3	453
	21st to end	Day	20% 26% 36% 14% 3	446
March	1st to 10th	Day	26% 22% 31% 17% 4	540
	11th to 20th	Day	29% 18% 32% 15% 6%	540
	21st to end	Day	26% 23% 30% 16% 3 1	594
April	1st to 10th	Day	34% 20% 28% 13% 4 1	540
	11th to 20th	Day	33% 18% 26% 13% 8% 2	532
	21st to end	Day	29% 21% 33% 12% 4 1	540
May	1st to 10th	Day	32% 19% 29% 13% 6% 1	543
	11th to 20th	Day	26% 18% 32% 17% 6% 1	567
	21st to end	Day	26% 23% 32% 14% 5%	656
June	1st to 10th	Day	26% 17% 31% 19% 7% 1	780
	11th to 20th	Day	26% 14% 31% 20% 7% 1	780
	21st to end	Day	27% 13% 30% 21% 8% 1	780
July	1st to 10th	Day	21% 14% 33% 24% 6% 1	626
	11th to 20th	Day	21% 15% 35% 20% 8% 1	564
	21st to end	Day	21% 13% 33% 24% 7% 1	620
August	1st to 10th	Day	21% 14% 30% 24% 9% 2	566
	11th to 20th	Day	20% 9% 29% 27% 11% 3	535
	21st to end	Day	25% 15% 26% 19% 10% 5%	583
September	1st to 10th	Day	27% 17% 28% 16% 8% 3	530
	11th to 20th	Day	23% 14% 28% 22% 9% 4	530
	21st to end	Day	27% 17% 24% 17% 11% 3	530
October	1st to 10th	Day	25% 19% 28% 17% 8% 2	530
	11th to 20th	Day	35% 17% 27% 11% 8% 2	451
	21st to end	Day	39% 17% 27% 14% 3	462
November	1st to 10th	Day	36% 21% 32% 8% 2	425
	11th to 20th	Day	30% 21% 29% 13% 6%	322
	21st to end	Day	34% 27% 27% 10% 2	220
December	1st to 10th	Day	29% 14% 35% 18% 5%	220
	11th to 20th	Day	29% 21% 40% 6% 2 1	220
	21st to end	Day	30% 20% 31% 13% 5% 1	242
January	1st to 10th	Night	24% 16% 35% 20% 5%	840
	11th to 20th	Night	25% 20% 28% 21% 5% 1	840
	21st to end	Night	13% 15% 36% 25% 9% 1	924
February	1st to 10th	Night	16% 18% 35% 23% 8%	840
	11th to 20th	Night	21% 16% 40% 17% 5%	823
	21st to end	Night	20% 18% 35% 22% 5%	692
March	1st to 10th	Night	22% 19% 33% 20% 5%	840
	11th to 20th	Night	25% 18% 32% 19% 6% 1	840
	21st to end	Night	21% 20% 32% 22% 5%	924
April	1st to 10th	Night	31% 14% 30% 21% 3 1	840
	11th to 20th	Night	30% 14% 29% 21% 6% 1	754
	21st to end	Night	29% 17% 31% 19% 3	630
May	1st to 10th	Night	27% 14% 33% 21% 5%	474
	11th to 20th	Night	24% 13% 31% 25% 7%	414
	21st to end	Night	27% 15% 33% 21% 3 1	455
June	1st to 10th	Night	23% 9% 35% 26% 6% 1	420
	11th to 20th	Night	19% 13% 32% 28% 8% 1	420
	21st to end	Night	21% 13% 28% 30% 7% 1	420
July	1st to 10th	Night	21% 10% 31% 28% 10%	410
	11th to 20th	Night	19% 7% 30% 34% 10%	408
	21st to end	Night	20% 7% 28% 34% 10%	460
August	1st to 10th	Night	17% 8% 29% 35% 10% 1	418
	11th to 20th	Night	22% 5% 27% 31% 14% 1	513
	21st to end	Night	24% 11% 27% 23% 12% 2	810
September	1st to 10th	Night	23% 10% 29% 29% 9% 1	800
	11th to 20th	Night	24% 10% 26% 27% 12% 1	800
	21st to end	Night	22% 13% 30% 24% 10% 1	800
October	1st to 10th	Night	25% 14% 31% 23% 7% 1	800
	11th to 20th	Night	34% 13% 30% 16% 7%	800
	21st to end	Night	38% 15% 28% 15% 4	880
November	1st to 10th	Night	31% 18% 32% 13% 5% 1	820
	11th to 20th	Night	30% 18% 28% 17% 6%	840
	21st to end	Night	33% 18% 29% 16% 4	928
December	1st to 10th	Night	27% 18% 30% 19% 6%	950
	11th to 20th	Night	26% 18% 32% 18% 5% 1	950
	21st to end	Night	28% 19% 29% 19% 4 1	1017

Page generated at 2026-08-12 03:37:14. Version ac07

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