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 2026-07-01.

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	24% 55% 8% 9% 3	144629
	Night	26% 55% 8% 8% 2	140770
Seeing	Day	19% 2 6% 19% 27% 26%	21121
	Night	11% 2 7% 24% 33% 23%	25180

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	34% 34% 27% 5%	256
	11th to 20th	Day	39% 38% 15% 8%	1316
	21st to end	Day	31% 39% 18% 7% 5%	2511
February	1st to 10th	Day	4 87% 6% 2 1	1085
	11th to 20th	Day	6% 87% 4 3 1	1440
	21st to end	Day	8% 87% 1 3 1	1397
March	1st to 10th	Day	20% 44% 5% 19% 12%	4113
	11th to 20th	Day	25% 46% 8% 15% 7%	5008
	21st to end	Day	28% 43% 8% 17% 4	5995
April	1st to 10th	Day	8% 87% 1 3	2767
	11th to 20th	Day	9% 87% 2 3	3024
	21st to end	Day	7% 87% 1 3 2	3305
May	1st to 10th	Day	40% 37% 6% 11% 6%	10174
	11th to 20th	Day	37% 38% 9% 8% 7%	10911
	21st to end	Day	33% 39% 8% 17% 3	13292
June	1st to 10th	Day	9% 87% 2 2 1	4985
	11th to 20th	Day	9% 87% 1 2	5040
	21st to end	Day	11% 85% 2 1	5040
July	1st to 10th	Day	37% 41% 11% 10% 1	10762
	11th to 20th	Day	29% 43% 16% 11% 1	9394
	21st to end	Day	22% 46% 20% 10% 2	9113
August	1st to 10th	Day	16% 56% 16% 11% 1	5597
	11th to 20th	Day	23% 55% 5% 13% 3	5197
	21st to end	Day	21% 55% 12% 10% 2	5241
September	1st to 10th	Day	7% 86% 3 4	2654
	11th to 20th	Day	9% 87% 2 2	2400
	21st to end	Day	7% 86% 2 3 2	2093
October	1st to 10th	Day	24% 56% 13% 5% 2	3127
	11th to 20th	Day	29% 57% 4 8% 1	2594
	21st to end	Day	26% 56% 4 11% 4	2344
November	1st to 10th	Day	7% 88% 2 3	1104
	11th to 20th	Day	7% 87% 3 3 1	836
	21st to end	Day	10% 87% 1 1 1	430
December	1st to 10th	Day	23% 71% 6%	84
	January	1st to 10th	Night	42% 37% 11% 8% 1	13148
11th to 20th		Night	38% 38% 14% 10%	11662
21st to end		Night	34% 37% 18% 9% 2	11714
February	1st to 10th	Night	4 88% 6% 2 1	3533
	11th to 20th	Night	6% 87% 5% 2 1	3077
	21st to end	Night	7% 87% 2 2 2	2407
March	1st to 10th	Night	22% 44% 4 17% 12%	5960
	11th to 20th	Night	27% 46% 11% 12% 5%	5171
	21st to end	Night	30% 44% 8% 13% 5%	5178
April	1st to 10th	Night	7% 88% 2 3	1853
	11th to 20th	Night	9% 87% 2 2 1	1564
	21st to end	Night	7% 87% 1 2 2	1315
May	1st to 10th	Night	42% 38% 8% 9% 3	2787
	11th to 20th	Night	41% 38% 5% 8% 7% 1	2000
	21st to end	Night	42% 41% 3 11% 3	899
July	11th to 20th	Night	37% 41% 12% 10%	464
	21st to end	Night	33% 52% 9% 6%	1449
August	1st to 10th	Night	17% 58% 16% 8% 1	1546
	11th to 20th	Night	27% 57% 3 11% 2	1931
	21st to end	Night	27% 54% 6% 11% 1	2635
September	1st to 10th	Night	7% 86% 3 4	1745
	11th to 20th	Night	10% 87% 2 2	2000
	21st to end	Night	8% 86% 2 3 1	2305
October	1st to 10th	Night	25% 55% 9% 8% 2	4052
	11th to 20th	Night	28% 58% 7% 7% 1	4555
	21st to end	Night	24% 55% 7% 11% 4	5456
November	1st to 10th	Night	7% 87% 2 3	3411
	11th to 20th	Night	7% 87% 2 2 1	3782
	21st to end	Night	10% 87% 2 1 1	4190
December	1st to 10th	Night	34% 58% 6% 1	7554
	11th to 20th	Night	28% 52% 11% 9%	9195
	21st to end	Night	26% 43% 6% 18% 7% 1	12232

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 7% 30% 38% 23%	74
	21st to end	Day	4 1 3 23% 42% 27%	171
February	1st to 10th	Day	2 2 23% 39% 34%	220
	11th to 20th	Day	3 17% 42% 38%	220
	21st to end	Day	1 1 4 26% 37% 30%	276
March	1st to 10th	Day	11% 6% 19% 32% 32%	430
	11th to 20th	Day	9% 1 3 18% 25% 45%	521
	21st to end	Day	8% 1 3 18% 30% 40%	594
April	1st to 10th	Day	9% 2 5% 21% 35% 28%	577
	11th to 20th	Day	7% 2 4 19% 31% 37%	739
	21st to end	Day	9% 3 7% 24% 30% 27%	750
May	1st to 10th	Day	19% 2 5% 22% 29% 23%	946
	11th to 20th	Day	21% 3 7% 20% 24% 25%	993
	21st to end	Day	20% 3 6% 16% 24% 31%	1299
June	1st to 10th	Day	21% 3 6% 15% 30% 24%	1382
	11th to 20th	Day	16% 2 7% 18% 32% 25%	1410
	21st to end	Day	32% 2 5% 17% 24% 19%	1410
July	1st to 10th	Day	23% 3 6% 15% 27% 27%	1307
	11th to 20th	Day	22% 2 5% 15% 26% 30%	1115
	21st to end	Day	21% 3 5% 15% 24% 31%	1033
August	1st to 10th	Day	32% 2 7% 14% 18% 27%	925
	11th to 20th	Day	29% 3 8% 20% 20% 20%	775
	21st to end	Day	30% 4 7% 21% 20% 17%	803
September	1st to 10th	Day	22% 5% 8% 20% 21% 24%	589
	11th to 20th	Day	16% 3 7% 18% 30% 27%	530
	21st to end	Day	22% 2 9% 18% 29% 19%	467
October	1st to 10th	Day	20% 4 10% 23% 27% 17%	420
	11th to 20th	Day	12% 4 11% 27% 28% 18%	420
	21st to end	Day	15% 5% 10% 25% 28% 17%	316
November	1st to 10th	Day	8% 3 10% 26% 37% 16%	184
	11th to 20th	Day	10% 2 10% 28% 37% 13%	110
	21st to end	Day	13% 5% 13% 25% 35% 10%	110
December	1st to 10th	Day	20% 60% 20%	5
	January	1st to 10th	Night	4 2 5% 29% 38% 22%	1317
11th to 20th		Night	3 1 4 24% 40% 29%	1212
21st to end		Night	4 1 8% 26% 38% 23%	1276
February	1st to 10th	Night	4 1 6% 23% 33% 33%	1146
	11th to 20th	Night	1 4 21% 39% 35%	933
	21st to end	Night	2 5% 23% 40% 31%	733
March	1st to 10th	Night	12% 2 7% 23% 30% 28%	840
	11th to 20th	Night	13% 1 3 21% 30% 32%	840
	21st to end	Night	11% 1 4 20% 33% 30%	793
April	1st to 10th	Night	7% 2 4 26% 36% 24%	630
	11th to 20th	Night	5% 1 4 24% 38% 29%	528
	21st to end	Night	8% 1 7% 28% 33% 23%	420
May	1st to 10th	Night	16% 1 8% 27% 34% 15%	347
	11th to 20th	Night	15% 5% 9% 30% 29% 13%	207
	21st to end	Night	14% 4 8% 29% 31% 15%	118
July	11th to 20th	Night	26% 3 21% 26% 24%	34
	21st to end	Night	21% 2 6% 19% 28% 24%	219
August	1st to 10th	Night	30% 1 6% 16% 24% 24%	344
	11th to 20th	Night	33% 2 5% 18% 26% 16%	396
	21st to end	Night	36% 1 9% 19% 19% 15%	515
September	1st to 10th	Night	26% 3 9% 19% 28% 15%	600
	11th to 20th	Night	22% 2 7% 20% 30% 20%	600
	21st to end	Night	26% 3 8% 20% 28% 14%	791
October	1st to 10th	Night	23% 4 11% 25% 24% 13%	812
	11th to 20th	Night	16% 2 13% 25% 29% 14%	910
	21st to end	Night	14% 4 10% 26% 27% 19%	1001
November	1st to 10th	Night	11% 2 8% 28% 33% 17%	989
	11th to 20th	Night	14% 2 10% 23% 31% 20%	1160
	21st to end	Night	13% 2 10% 25% 29% 22%	1265
December	1st to 10th	Night	8% 2 9% 25% 35% 21%	1306
	11th to 20th	Night	5% 1 7% 25% 34% 28%	1380
	21st to end	Night	6% 2 6% 22% 36% 29%	1518

Page generated at 2026-06-28 02:10:48. Version ac07

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