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 2025-02-25.

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	15% 70% 7% 7% 2	110296
	Night	21% 62% 7% 8% 2	120831
Seeing	Day	20% 2 6% 18% 27% 26%	19021
	Night	11% 2 7% 23% 33% 24%	23619

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	16% 43% 35% 7%	200
	11th to 20th	Day	34% 47% 12% 7%	1008
	21st to end	Day	31% 47% 9% 5% 7%	1925
February	1st to 10th	Day	2 91% 5% 2 1	1033
	11th to 20th	Day	3 91% 4 2 1	1370
	21st to end	Day	4 93% 1 1 1	1297
March	1st to 10th	Day	6% 59% 2 15% 18%	2803
	11th to 20th	Day	9% 65% 8% 14% 5%	3428
	21st to end	Day	13% 60% 11% 14% 1	4104
April	1st to 10th	Day	3 96% 1 1	2503
	11th to 20th	Day	2 95% 1 1	2732
	21st to end	Day	3 96% 1 1	2990
May	1st to 10th	Day	20% 62% 8% 9%	5489
	11th to 20th	Day	10% 65% 14% 9% 2	5845
	21st to end	Day	24% 63% 7% 5% 1	7114
June	1st to 10th	Day	3 95% 1 1	4509
	11th to 20th	Day	4 95%	4560
	21st to end	Day	6% 94%	4560
July	1st to 10th	Day	30% 57% 10% 3 1	7481
	11th to 20th	Day	23% 56% 11% 9% 1	6532
	21st to end	Day	21% 57% 8% 11% 3	6325
August	1st to 10th	Day	16% 58% 15% 10% 1	5425
	11th to 20th	Day	22% 56% 5% 13% 3	5037
	21st to end	Day	20% 56% 11% 10% 2	5081
September	1st to 10th	Day	5% 90% 2 3	2521
	11th to 20th	Day	6% 91% 1 2	2280
	21st to end	Day	4 90% 2 3 2	1989
October	1st to 10th	Day	23% 58% 13% 4 2	3031
	11th to 20th	Day	28% 59% 4 7% 1	2514
	21st to end	Day	24% 58% 4 11% 4	2272
November	1st to 10th	Day	4 91% 2 2	1050
	11th to 20th	Day	4 91% 3 2	796
	21st to end	Day	7% 91% 1	410
December	1st to 10th	Day	22% 73% 5%	82
	January	1st to 10th	Night	33% 46% 11% 10% 1	10147
11th to 20th		Night	33% 48% 10% 9%	8963
21st to end		Night	33% 46% 10% 8% 3	9060
February	1st to 10th	Night	2 91% 4 2 1	3365
	11th to 20th	Night	3 91% 4 2	2927
	21st to end	Night	4 93% 2 1	2250
March	1st to 10th	Night	9% 59% 3 13% 15%	4050
	11th to 20th	Night	9% 63% 10% 13% 5%	3531
	21st to end	Night	14% 63% 10% 12%	3527
April	1st to 10th	Night	2 96% 2	1677
	11th to 20th	Night	2 95% 1 1 1	1414
	21st to end	Night	4 95% 1 1	1190
May	1st to 10th	Night	15% 66% 11% 8%	1486
	11th to 20th	Night	14% 65% 8% 8% 5%	1065
	21st to end	Night	25% 70% 5% 1	465
July	11th to 20th	Night	32% 52% 5% 10%	324
	21st to end	Night	35% 55% 4 6% 1	1000
August	1st to 10th	Night	16% 60% 15% 8% 1	1498
	11th to 20th	Night	26% 58% 3 11% 2	1871
	21st to end	Night	27% 56% 6% 11% 1	2554
September	1st to 10th	Night	5% 90% 2 3	1658
	11th to 20th	Night	6% 91% 1 2	1900
	21st to end	Night	5% 90% 1 3 1	2189
October	1st to 10th	Night	23% 57% 9% 8% 2	3928
	11th to 20th	Night	27% 59% 7% 7%	4415
	21st to end	Night	22% 56% 6% 11% 4	5287
November	1st to 10th	Night	4 91% 2 3	3245
	11th to 20th	Night	4 91% 2 1 1	3602
	21st to end	Night	6% 91% 1 1	3990
December	1st to 10th	Night	34% 60% 6% 1	7330
	11th to 20th	Night	27% 53% 11% 9%	8955
	21st to end	Night	25% 43% 6% 18% 7% 1	11968

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 4 31% 36% 25%	67
	21st to end	Day	5% 1 3 23% 42% 27%	155
February	1st to 10th	Day	2 1 2 24% 39% 34%	200
	11th to 20th	Day	3 19% 44% 35%	200
	21st to end	Day	1 1 4 27% 36% 31%	244
March	1st to 10th	Day	13% 5% 19% 32% 31%	370
	11th to 20th	Day	10% 2 15% 28% 44%	445
	21st to end	Day	9% 1 4 20% 29% 37%	506
April	1st to 10th	Day	9% 2 5% 20% 34% 29%	493
	11th to 20th	Day	7% 1 4 18% 31% 38%	639
	21st to end	Day	11% 4 7% 24% 31% 24%	650
May	1st to 10th	Day	21% 2 5% 19% 28% 25%	828
	11th to 20th	Day	22% 2 7% 20% 23% 26%	871
	21st to end	Day	21% 2 7% 16% 23% 31%	1145
June	1st to 10th	Day	22% 3 6% 15% 30% 24%	1224
	11th to 20th	Day	17% 2 8% 18% 30% 26%	1250
	21st to end	Day	32% 2 5% 17% 24% 19%	1250
July	1st to 10th	Day	23% 2 6% 15% 26% 28%	1226
	11th to 20th	Day	22% 2 5% 14% 25% 31%	1045
	21st to end	Day	23% 3 5% 16% 25% 27%	966
August	1st to 10th	Day	34% 2 7% 13% 18% 27%	865
	11th to 20th	Day	29% 3 8% 18% 20% 22%	722
	21st to end	Day	31% 4 7% 21% 20% 17%	748
September	1st to 10th	Day	22% 5% 8% 20% 20% 25%	546
	11th to 20th	Day	14% 3 8% 17% 30% 28%	490
	21st to end	Day	22% 2 9% 18% 28% 20%	433
October	1st to 10th	Day	20% 4 9% 23% 27% 17%	390
	11th to 20th	Day	13% 4 11% 28% 28% 17%	390
	21st to end	Day	15% 5% 10% 23% 28% 19%	291
November	1st to 10th	Day	8% 4 11% 26% 36% 16%	167
	11th to 20th	Day	9% 2 9% 29% 38% 13%	100
	21st to end	Day	12% 4 14% 26% 34% 10%	100
December	1st to 10th	Day	20% 60% 20%	5
	January	1st to 10th	Night	4 2 5% 28% 38% 23%	1243
11th to 20th		Night	3 1 4 23% 40% 29%	1147
21st to end		Night	4 1 7% 26% 39% 24%	1210
February	1st to 10th	Night	4 1 7% 23% 33% 32%	1087
	11th to 20th	Night	1 4 22% 39% 34%	883
	21st to end	Night	2 5% 24% 38% 31%	684
March	1st to 10th	Night	12% 2 6% 22% 30% 28%	760
	11th to 20th	Night	13% 1 3 21% 31% 31%	760
	21st to end	Night	12% 1 5% 21% 32% 28%	717
April	1st to 10th	Night	7% 3 5% 26% 37% 22%	570
	11th to 20th	Night	5% 4 23% 37% 30%	478
	21st to end	Night	9% 2 7% 28% 34% 21%	380
May	1st to 10th	Night	16% 1 8% 26% 33% 16%	314
	11th to 20th	Night	14% 4 10% 30% 29% 13%	187
	21st to end	Night	13% 4 8% 26% 32% 16%	106
July	11th to 20th	Night	25% 3 22% 25% 25%	32
	21st to end	Night	22% 2 7% 20% 28% 21%	208
August	1st to 10th	Night	31% 1 6% 15% 23% 24%	326
	11th to 20th	Night	33% 2 5% 19% 24% 17%	376
	21st to end	Night	37% 1 9% 19% 18% 15%	489
September	1st to 10th	Night	25% 3 9% 19% 29% 15%	570
	11th to 20th	Night	21% 2 7% 21% 30% 20%	570
	21st to end	Night	26% 3 8% 21% 27% 15%	751
October	1st to 10th	Night	23% 4 11% 24% 25% 14%	771
	11th to 20th	Night	17% 2 12% 26% 30% 13%	860
	21st to end	Night	13% 3 10% 27% 27% 20%	946
November	1st to 10th	Night	12% 2 9% 27% 33% 18%	936
	11th to 20th	Night	14% 2 9% 23% 32% 20%	1100
	21st to end	Night	12% 2 10% 25% 28% 22%	1195
December	1st to 10th	Night	8% 2 9% 24% 35% 22%	1233
	11th to 20th	Night	6% 1 7% 24% 34% 28%	1300
	21st to end	Night	6% 2 6% 20% 36% 30%	1430

Page generated at 2025-02-22 06:51:37. Version ac07

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