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 2024-02-20.

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	19% 13% 5% 9% 7% 4 5% 4 5% 6% 23%	77957
	Night	17% 14% 6% 10% 8% 4 5% 4 4 5% 23%	81232
Transparency	Day	63% 6% 10% 14% 7% 1	77662
	Night	65% 6% 10% 14% 6% 1	81062
Seeing	Day	27% 18% 30% 17% 6% 1	14064
	Night	25% 15% 31% 22% 6% 1	22786

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	13% 20% 9% 17% 10% 5% 4 4 3 4 10%	2517
	11th to 20th	Day	11% 13% 8% 16% 14% 8% 7% 4 4 4 12%	2520
	21st to end	Day	9% 13% 8% 17% 8% 4 6% 6% 5% 5% 20%	2772
February	1st to 10th	Day	8% 14% 7% 13% 12% 7% 9% 5% 4 5% 15%	1525
	11th to 20th	Day	12% 16% 8% 13% 9% 6% 7% 5% 5% 4 15%	1763
	21st to end	Day	11% 16% 7% 13% 7% 4 7% 5% 4 5% 21%	1480
March	1st to 10th	Day	13% 16% 6% 13% 9% 3 5% 5% 4 5% 23%	1797
	11th to 20th	Day	16% 16% 7% 10% 7% 5% 5% 4 3 4 23%	1849
	21st to end	Day	16% 14% 7% 11% 7% 3 4 4 4 5% 25%	2365
April	1st to 10th	Day	21% 18% 7% 9% 6% 3 4 3 3 5% 21%	2160
	11th to 20th	Day	20% 13% 3 7% 4 2 3 4 5% 6% 32%	2199
	21st to end	Day	21% 13% 4 8% 6% 3 4 4 4 6% 27%	2340
May	1st to 10th	Day	22% 11% 3 7% 5% 3 4 4 5% 6% 29%	2488
	11th to 20th	Day	18% 10% 3 6% 6% 3 5% 4 4 6% 34%	2478
	21st to end	Day	22% 8% 4 6% 7% 4 4 5% 5% 6% 29%	2758
June	1st to 10th	Day	23% 9% 3 7% 6% 3 5% 5% 6% 7% 26%	2700
	11th to 20th	Day	21% 8% 3 6% 5% 3 5% 5% 5% 9% 30%	2700
	21st to end	Day	25% 7% 3 7% 7% 4 5% 6% 5% 7% 25%	2700
July	1st to 10th	Day	21% 8% 3 7% 6% 5% 5% 5% 7% 9% 25%	2573
	11th to 20th	Day	18% 8% 3 8% 7% 4 7% 5% 6% 8% 26%	2520
	21st to end	Day	19% 8% 3 7% 7% 4 6% 6% 6% 7% 27%	2744
August	1st to 10th	Day	21% 9% 4 8% 7% 3 6% 6% 6% 7% 23%	2506
	11th to 20th	Day	21% 8% 3 6% 5% 4 6% 4 7% 8% 27%	2366
	21st to end	Day	19% 10% 4 8% 6% 4 5% 6% 5% 6% 26%	2439
September	1st to 10th	Day	21% 9% 2 6% 6% 4 4 5% 5% 7% 32%	2160
	11th to 20th	Day	20% 10% 3 6% 5% 3 3 5% 5% 7% 34%	2043
	21st to end	Day	24% 11% 3 5% 5% 3 4 4 5% 5% 30%	1980
October	1st to 10th	Day	22% 13% 5% 7% 6% 3 4 4 4 6% 26%	1913
	11th to 20th	Day	27% 19% 5% 8% 6% 3 4 4 4 5% 16%	1673
	21st to end	Day	27% 21% 4 7% 5% 3 3 3 4 5% 19%	1782
November	1st to 10th	Day	20% 19% 8% 10% 5% 3 4 4 3 4 20%	1671
	11th to 20th	Day	22% 18% 8% 11% 8% 3 4 3 2 4 18%	1613
	21st to end	Day	20% 21% 7% 13% 10% 3 2 2 3 4 13%	1368
December	1st to 10th	Day	18% 21% 8% 13% 12% 4 5% 4 3 2 10%	1330
	11th to 20th	Day	18% 19% 7% 12% 9% 3 5% 4 4 4 17%	1668
	21st to end	Day	19% 18% 7% 13% 13% 5% 4 4 3 4 10%	2497
January	1st to 10th	Night	13% 20% 8% 12% 13% 7% 6% 4 3 3 10%	4429
	11th to 20th	Night	11% 14% 6% 16% 15% 7% 6% 4 4 3 15%	4440
	21st to end	Night	8% 13% 8% 13% 11% 7% 7% 6% 5% 5% 17%	4884
February	1st to 10th	Night	9% 13% 7% 11% 11% 7% 8% 5% 4 5% 19%	2651
	11th to 20th	Night	10% 17% 7% 15% 9% 6% 5% 4 4 4 17%	2287
	21st to end	Night	10% 17% 6% 12% 8% 5% 6% 5% 5% 7% 21%	1776
March	1st to 10th	Night	12% 15% 6% 12% 9% 4 6% 5% 4 5% 22%	2150
	11th to 20th	Night	17% 14% 5% 10% 9% 5% 5% 4 4 5% 23%	2110
	21st to end	Night	14% 15% 6% 10% 7% 4 4 4 4 5% 28%	1990
April	1st to 10th	Night	22% 18% 6% 9% 5% 3 4 3 3 5% 22%	1800
	11th to 20th	Night	20% 11% 4 6% 5% 3 3 4 5% 7% 30%	1710
	21st to end	Night	18% 12% 5% 7% 7% 3 4 3 5% 6% 30%	1620
May	1st to 10th	Night	23% 12% 3 7% 5% 3 4 4 4 4 30%	1487
	11th to 20th	Night	20% 10% 4 6% 5% 4 5% 4 4 6% 34%	1415
	21st to end	Night	23% 9% 3 6% 6% 2 4 4 4 6% 33%	1514
June	1st to 10th	Night	19% 9% 4 8% 7% 3 4 4 4 7% 31%	1260
	11th to 20th	Night	18% 7% 3 6% 6% 3 4 6% 6% 9% 33%	1260
	21st to end	Night	19% 8% 3 7% 6% 3 5% 5% 5% 8% 30%	1260
July	1st to 10th	Night	21% 7% 2 6% 5% 3 5% 5% 7% 7% 31%	1382
	11th to 20th	Night	16% 7% 3 6% 8% 4 6% 6% 6% 8% 31%	1440
	21st to end	Night	20% 9% 3 6% 5% 3 5% 5% 4 9% 31%	1574
August	1st to 10th	Night	16% 6% 3 6% 5% 4 6% 6% 7% 7% 33%	1432
	11th to 20th	Night	19% 7% 3 6% 5% 3 5% 5% 6% 9% 32%	1517
	21st to end	Night	20% 8% 3 5% 5% 3 5% 5% 5% 7% 33%	1916
September	1st to 10th	Night	20% 7% 3 6% 5% 3 4 4 5% 7% 38%	1800
	11th to 20th	Night	20% 8% 3 6% 4 2 5% 4 4 6% 36%	1916
	21st to end	Night	18% 10% 3 7% 5% 2 4 4 4 5% 37%	1980
October	1st to 10th	Night	19% 11% 3 6% 5% 3 5% 4 4 6% 34%	2045
	11th to 20th	Night	25% 16% 4 6% 6% 4 4 4 4 6% 21%	2286
	21st to end	Night	26% 18% 5% 7% 6% 3 4 4 4 5% 19%	2574
November	1st to 10th	Night	18% 17% 8% 9% 8% 4 5% 4 4 4 19%	2407
	11th to 20th	Night	19% 15% 8% 11% 7% 4 5% 4 4 5% 18%	2565
	21st to end	Night	20% 18% 7% 13% 9% 4 4 3 3 4 13%	2811
December	1st to 10th	Night	17% 21% 8% 14% 10% 4 4 4 3 3 12%	2850
	11th to 20th	Night	18% 16% 8% 12% 9% 5% 5% 4 4 4 16%	3531
	21st to end	Night	18% 21% 7% 12% 11% 5% 4 4 3 3 12%	5163

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	79% 4 7% 8% 2	2518
	11th to 20th	Day	77% 4 7% 7% 4	2520
	21st to end	Day	66% 5% 6% 14% 9% 1	2772
February	1st to 10th	Day	72% 4 6% 10% 6% 1	1525
	11th to 20th	Day	72% 4 8% 8% 8% 1	1772
	21st to end	Day	66% 4 7% 16% 5% 2	1480
March	1st to 10th	Day	67% 3 6% 13% 9% 1	1800
	11th to 20th	Day	67% 4 6% 14% 9% 1	1849
	21st to end	Day	63% 4 7% 15% 10% 2	2365
April	1st to 10th	Day	68% 4 9% 10% 7% 3	2160
	11th to 20th	Day	54% 5% 8% 18% 12% 2	2199
	21st to end	Day	60% 4 9% 13% 12% 2	2340
May	1st to 10th	Day	56% 5% 9% 15% 12% 2	2488
	11th to 20th	Day	51% 7% 8% 21% 12% 1	2482
	21st to end	Day	56% 7% 7% 17% 12% 1	2758
June	1st to 10th	Day	58% 6% 9% 17% 9% 2	2700
	11th to 20th	Day	51% 8% 11% 19% 9% 2	2700
	21st to end	Day	58% 8% 10% 14% 10%	2700
July	1st to 10th	Day	54% 9% 14% 19% 5%	2503
	11th to 20th	Day	54% 9% 12% 19% 5% 1	2445
	21st to end	Day	57% 8% 13% 17% 4	2591
August	1st to 10th	Day	60% 9% 15% 14% 2	2492
	11th to 20th	Day	52% 10% 16% 16% 6%	2366
	21st to end	Day	57% 7% 13% 19% 5%	2439
September	1st to 10th	Day	52% 6% 14% 21% 7%	2160
	11th to 20th	Day	50% 7% 17% 19% 7%	2043
	21st to end	Day	56% 6% 14% 17% 7%	1980
October	1st to 10th	Day	59% 6% 12% 16% 8%	1913
	11th to 20th	Day	72% 7% 9% 11% 2	1673
	21st to end	Day	70% 5% 9% 12% 3 1	1782
November	1st to 10th	Day	68% 6% 8% 12% 5%	1671
	11th to 20th	Day	73% 5% 9% 9% 3 1	1613
	21st to end	Day	79% 4 8% 7% 1	1368
December	1st to 10th	Day	82% 3 5% 8% 2	1330
	11th to 20th	Day	73% 5% 5% 12% 5%	1668
	21st to end	Day	79% 3 6% 7% 4	2497
January	1st to 10th	Night	81% 4 8% 6% 2	4429
	11th to 20th	Night	75% 5% 7% 10% 4 1	4440
	21st to end	Night	68% 5% 9% 10% 7%	4884
February	1st to 10th	Night	68% 5% 6% 14% 7% 1	2651
	11th to 20th	Night	72% 4 8% 11% 5% 1	2289
	21st to end	Night	65% 4 8% 15% 7% 1	1776
March	1st to 10th	Night	65% 5% 7% 15% 8% 1	2160
	11th to 20th	Night	64% 5% 7% 13% 9% 1	2111
	21st to end	Night	61% 5% 8% 16% 8% 2	1990
April	1st to 10th	Night	67% 4 9% 12% 7% 2	1800
	11th to 20th	Night	55% 5% 9% 19% 10% 1	1710
	21st to end	Night	56% 5% 8% 20% 11% 1	1620
May	1st to 10th	Night	57% 6% 9% 13% 14% 2	1487
	11th to 20th	Night	51% 6% 9% 19% 14% 1	1416
	21st to end	Night	52% 6% 9% 20% 11% 1	1515
June	1st to 10th	Night	55% 5% 10% 20% 8% 2	1260
	11th to 20th	Night	47% 7% 13% 18% 11% 3	1260
	21st to end	Night	52% 9% 13% 17% 10%	1260
July	1st to 10th	Night	50% 9% 16% 20% 5%	1342
	11th to 20th	Night	50% 9% 15% 20% 6%	1392
	21st to end	Night	52% 9% 13% 21% 5%	1486
August	1st to 10th	Night	47% 11% 17% 21% 3	1422
	11th to 20th	Night	48% 11% 17% 18% 5%	1517
	21st to end	Night	49% 9% 15% 23% 4	1916
September	1st to 10th	Night	47% 7% 14% 24% 9%	1800
	11th to 20th	Night	49% 6% 18% 21% 5%	1916
	21st to end	Night	51% 5% 13% 24% 6% 1	1980
October	1st to 10th	Night	53% 6% 14% 18% 9% 1	2045
	11th to 20th	Night	64% 7% 11% 14% 4	2286
	21st to end	Night	69% 5% 8% 11% 5% 1	2574
November	1st to 10th	Night	69% 6% 9% 12% 4	2407
	11th to 20th	Night	70% 5% 10% 12% 3	2565
	21st to end	Night	78% 4 8% 8% 2	2811
December	1st to 10th	Night	79% 4 7% 8% 2	2850
	11th to 20th	Night	75% 4 6% 11% 5%	3532
	21st to end	Night	79% 4 7% 8% 2	5163

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	24% 21% 41% 11% 3	180
	11th to 20th	Day	21% 23% 33% 18% 6%	180
	21st to end	Day	20% 17% 34% 22% 6% 1	198
February	1st to 10th	Day	20% 32% 37% 9% 2 1	183
	11th to 20th	Day	23% 27% 34% 14% 3	377
	21st to end	Day	21% 26% 34% 15% 4	346
March	1st to 10th	Day	24% 21% 31% 18% 5%	420
	11th to 20th	Day	28% 19% 31% 16% 7%	420
	21st to end	Day	27% 21% 30% 17% 4 2	462
April	1st to 10th	Day	33% 21% 26% 13% 5% 1	420
	11th to 20th	Day	33% 17% 25% 14% 8% 2	412
	21st to end	Day	29% 19% 36% 12% 4 1	420
May	1st to 10th	Day	30% 20% 30% 13% 6%	423
	11th to 20th	Day	26% 18% 34% 16% 6% 1	447
	21st to end	Day	26% 23% 32% 13% 5%	518
June	1st to 10th	Day	27% 18% 30% 17% 7% 1	630
	11th to 20th	Day	27% 14% 30% 21% 8% 1	630
	21st to end	Day	27% 12% 30% 22% 7% 1	630
July	1st to 10th	Day	21% 14% 33% 25% 6% 1	498
	11th to 20th	Day	21% 14% 33% 21% 9% 1	444
	21st to end	Day	23% 11% 33% 24% 8% 1	488
August	1st to 10th	Day	24% 12% 30% 23% 9% 2	446
	11th to 20th	Day	21% 9% 30% 26% 11% 3	439
	21st to end	Day	24% 17% 27% 17% 9% 6%	495
September	1st to 10th	Day	28% 17% 26% 17% 9% 4	450
	11th to 20th	Day	26% 14% 30% 20% 7% 3	450
	21st to end	Day	27% 17% 26% 16% 11% 3	450
October	1st to 10th	Day	27% 19% 26% 18% 8% 2	450
	11th to 20th	Day	37% 17% 26% 10% 8% 2	386
	21st to end	Day	40% 17% 26% 14% 3	396
November	1st to 10th	Day	36% 21% 32% 8% 3	365
	11th to 20th	Day	30% 22% 30% 12% 6%	273
	21st to end	Day	36% 26% 28% 8% 2 1	180
December	1st to 10th	Day	32% 13% 31% 18% 5% 1	180
	11th to 20th	Day	27% 24% 39% 6% 3 2	180
	21st to end	Day	33% 21% 28% 12% 5% 1	198
January	1st to 10th	Night	25% 17% 35% 19% 5%	760
	11th to 20th	Night	25% 19% 30% 21% 5%	760
	21st to end	Night	14% 15% 36% 26% 8% 1	836
February	1st to 10th	Night	17% 19% 34% 23% 6%	760
	11th to 20th	Night	21% 16% 41% 16% 5%	742
	21st to end	Night	21% 18% 36% 20% 5% 1	592
March	1st to 10th	Night	22% 17% 34% 21% 6%	720
	11th to 20th	Night	25% 17% 32% 19% 6% 1	720
	21st to end	Night	22% 19% 31% 22% 5% 1	792
April	1st to 10th	Night	31% 13% 30% 23% 3 1	720
	11th to 20th	Night	29% 15% 28% 21% 6% 1	646
	21st to end	Night	27% 17% 32% 21% 3	540
May	1st to 10th	Night	27% 14% 33% 22% 5%	407
	11th to 20th	Night	25% 13% 29% 25% 8%	354
	21st to end	Night	28% 15% 32% 20% 4 1	389
June	1st to 10th	Night	24% 9% 35% 25% 6% 1	360
	11th to 20th	Night	18% 12% 33% 28% 8% 1	360
	21st to end	Night	19% 12% 29% 31% 8% 1	360
July	1st to 10th	Night	23% 11% 30% 26% 10%	350
	11th to 20th	Night	18% 7% 28% 34% 11% 1	348
	21st to end	Night	21% 7% 28% 35% 9%	394
August	1st to 10th	Night	18% 9% 29% 34% 10% 1	358
	11th to 20th	Night	23% 5% 28% 30% 13% 1	453
	21st to end	Night	23% 11% 29% 22% 12% 2	728
September	1st to 10th	Night	23% 9% 28% 29% 9% 1	720
	11th to 20th	Night	27% 10% 27% 25% 10% 1	720
	21st to end	Night	23% 13% 30% 23% 10% 1	720
October	1st to 10th	Night	26% 14% 30% 23% 6% 1	720
	11th to 20th	Night	35% 13% 30% 14% 8%	720
	21st to end	Night	38% 14% 29% 14% 4	792
November	1st to 10th	Night	29% 18% 33% 13% 5% 1	740
	11th to 20th	Night	30% 18% 29% 17% 6% 1	760
	21st to end	Night	33% 17% 29% 17% 3	832
December	1st to 10th	Night	29% 18% 28% 19% 6%	850
	11th to 20th	Night	25% 18% 32% 18% 5% 1	850
	21st to end	Night	29% 19% 29% 18% 4 1	913

Page generated at 2024-02-17 06:28:39. Version ac07

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