Qikiqtarjuaq
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Qikiqtarjuaq clear sky chart from 2005-11-06 to 2024-02-05.

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
Transparency	Day	2 97% 1	75863
	Night	9% 84% 2 3 1	85537
Seeing	Day	20% 2 7% 18% 27% 26%	17580
	Night	12% 2 7% 23% 33% 24%	22189

By Month

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	11% 58% 27% 5%	130
	11th to 20th	Day	20% 69% 8% 3	686
	21st to end	Day	11% 63% 9% 8% 10%	1328
February	1st to 10th	Day	98% 1 1	950
	11th to 20th	Day	100%	1230
	21st to end	Day	100%	1194
March	1st to 10th	Day	100%	1620
	11th to 20th	Day	100%	1942
	21st to end	Day	100%	2329
April	1st to 10th	Day	100%	2371
	11th to 20th	Day	100%	2586
	21st to end	Day	100%	2832
May	1st to 10th	Day	100%	3107
	11th to 20th	Day	100%	3293
	21st to end	Day	100%	4005
June	1st to 10th	Day	100%	4271
	11th to 20th	Day	100%	4320
	21st to end	Day	1 99%	4320
July	1st to 10th	Day	3 95% 1 1	4201
	11th to 20th	Day	5% 95%	3684
	21st to end	Day	3 95% 1	3529
August	1st to 10th	Day	2 96% 1	3073
	11th to 20th	Day	2 95% 1 2	2845
	21st to end	Day	3 96% 1 1 1	2885
September	1st to 10th	Day	3 95% 1 1	2390
	11th to 20th	Day	3 95% 1	2160
	21st to end	Day	2 95% 1 2	1885
October	1st to 10th	Day	4 95% 1	1739
	11th to 20th	Day	2 95% 1 1	1440
	21st to end	Day	3 95% 1 1	1320
November	1st to 10th	Day	2 95% 1 1	997
	11th to 20th	Day	2 95% 2 1	757
	21st to end	Day	4 95% 1 1	390
December	1st to 10th	Day	94% 6%	54
	January	1st to 10th	Night	23% 59% 7% 9% 2	7105
11th to 20th		Night	26% 65% 6% 4	6278
21st to end		Night	14% 63% 8% 10% 4	6341
February	1st to 10th	Night	98% 1 1 1	3104
	11th to 20th	Night	100%	2627
	21st to end	Night	100%	2060
March	1st to 10th	Night	100%	2340
	11th to 20th	Night	100%	2017
	21st to end	Night	100%	2026
April	1st to 10th	Night	100%	1589
	11th to 20th	Night	100%	1339
	21st to end	Night	100%	1128
May	1st to 10th	Night	100%	852
	11th to 20th	Night	100%	607
	21st to end	Night	100%	269
July	11th to 20th	Night	5% 95% 1	170
	21st to end	Night	4 95% 1	549
August	1st to 10th	Night	2 97% 1	840
	11th to 20th	Night	2 95% 1 2	1056
	21st to end	Night	3 95% 1 1 1	1453
September	1st to 10th	Night	3 95% 1 1	1570
	11th to 20th	Night	4 95% 1	1800
	21st to end	Night	3 95% 1 2	2073
October	1st to 10th	Night	4 95%	2218
	11th to 20th	Night	3 95% 1 1	2520
	21st to end	Night	2 95% 1 1 1	3036
November	1st to 10th	Night	2 96% 1 1	3078
	11th to 20th	Night	1 96% 2	3421
	21st to end	Night	4 96% 1	3790
December	1st to 10th	Night	1 96% 1 1	4246
	11th to 20th	Night	17% 79% 2 1	5675
	21st to end	Night	26% 60% 3 6% 3 1	8360

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	11th to 20th	Day	3 5% 33% 33% 25%	60
	21st to end	Day	4 2 22% 42% 30%	139
February	1st to 10th	Day	2 1 1 26% 43% 28%	168
	11th to 20th	Day	2 15% 46% 38%	160
	21st to end	Day	1 1 5% 27% 35% 31%	212
March	1st to 10th	Day	14% 4 19% 33% 30%	340
	11th to 20th	Day	11% 3 17% 29% 40%	406
	21st to end	Day	10% 1 3 19% 30% 36%	462
April	1st to 10th	Day	10% 1 5% 19% 35% 31%	451
	11th to 20th	Day	8% 1 4 18% 30% 39%	589
	21st to end	Day	11% 4 6% 23% 31% 26%	600
May	1st to 10th	Day	22% 2 6% 19% 27% 25%	768
	11th to 20th	Day	23% 2 7% 20% 22% 25%	810
	21st to end	Day	22% 2 7% 16% 22% 31%	1068
June	1st to 10th	Day	23% 3 7% 15% 30% 23%	1145
	11th to 20th	Day	16% 2 8% 18% 29% 27%	1170
	21st to end	Day	32% 2 6% 18% 24% 18%	1170
July	1st to 10th	Day	22% 2 7% 15% 26% 28%	1146
	11th to 20th	Day	23% 2 6% 15% 26% 29%	975
	21st to end	Day	24% 3 6% 16% 24% 28%	899
August	1st to 10th	Day	35% 1 7% 14% 18% 25%	805
	11th to 20th	Day	29% 2 7% 18% 20% 23%	669
	21st to end	Day	31% 4 8% 19% 20% 17%	693
September	1st to 10th	Day	23% 5% 9% 21% 20% 23%	504
	11th to 20th	Day	14% 3 8% 18% 29% 28%	450
	21st to end	Day	23% 2 10% 20% 29% 17%	399
October	1st to 10th	Day	20% 4 9% 23% 28% 17%	360
	11th to 20th	Day	14% 3 11% 27% 28% 17%	360
	21st to end	Day	15% 5% 11% 22% 27% 20%	266
November	1st to 10th	Day	8% 3 11% 26% 35% 17%	151
	11th to 20th	Day	10% 1 10% 29% 38% 12%	90
	21st to end	Day	13% 4 14% 27% 30% 11%	90
December	1st to 10th	Day	20% 60% 20%	5
	January	1st to 10th	Night	4 2 5% 28% 38% 23%	1169
11th to 20th		Night	3 1 4 24% 39% 29%	1083
21st to end		Night	4 1 6% 25% 39% 25%	1144
February	1st to 10th	Night	4 1 7% 23% 33% 31%	995
	11th to 20th	Night	1 3 20% 40% 36%	783
	21st to end	Night	2 5% 22% 39% 32%	622
March	1st to 10th	Night	13% 2 6% 22% 30% 27%	720
	11th to 20th	Night	14% 1 3 22% 31% 29%	720
	21st to end	Night	13% 1 5% 21% 32% 27%	680
April	1st to 10th	Night	7% 3 5% 25% 38% 23%	540
	11th to 20th	Night	6% 4 22% 37% 31%	453
	21st to end	Night	9% 2 6% 28% 35% 21%	360
May	1st to 10th	Night	17% 1 9% 27% 30% 17%	298
	11th to 20th	Night	15% 5% 10% 29% 28% 13%	177
	21st to end	Night	14% 4 9% 27% 30% 17%	101
July	11th to 20th	Night	27% 3 23% 27% 20%	30
	21st to end	Night	23% 2 7% 19% 28% 21%	197
August	1st to 10th	Night	32% 1 6% 15% 23% 23%	308
	11th to 20th	Night	33% 2 5% 19% 24% 18%	356
	21st to end	Night	37% 1 9% 19% 18% 16%	463
September	1st to 10th	Night	26% 3 9% 20% 29% 14%	540
	11th to 20th	Night	21% 2 7% 21% 30% 19%	540
	21st to end	Night	27% 3 8% 22% 27% 13%	711
October	1st to 10th	Night	23% 4 10% 24% 25% 14%	729
	11th to 20th	Night	17% 2 13% 25% 30% 13%	810
	21st to end	Night	13% 3 10% 26% 27% 21%	891
November	1st to 10th	Night	12% 2 9% 28% 32% 18%	883
	11th to 20th	Night	14% 2 9% 22% 32% 21%	1040
	21st to end	Night	13% 2 10% 25% 27% 22%	1125
December	1st to 10th	Night	8% 2 9% 23% 35% 23%	1159
	11th to 20th	Night	6% 1 6% 24% 35% 27%	1220
	21st to end	Night	6% 2 6% 21% 35% 30%	1342

Page generated at 2024-02-02 05:20:29. Version ac07

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