Iqaluit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Iqaluit clear sky chart from 2005-11-06 to 2026-07-31.

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	13% 13% 5% 12% 7% 6% 6% 5% 6% 7% 21%	139922
	Night	8% 12% 5% 13% 8% 8% 7% 6% 7% 8% 18%	133543
Transparency	Day	61% 6% 14% 15% 4	142804
	Night	60% 7% 13% 15% 5%	138768
Seeing	Day	19% 7% 19% 25% 20% 10%	19707
	Night	14% 5% 16% 29% 27% 10%	26092

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	6% 17% 5% 16% 12% 6% 6% 5% 5% 7% 15%	1990
	11th to 20th	Day	3 12% 5% 18% 13% 10% 7% 6% 7% 7% 12%	2584
	21st to end	Day	1 4 3 11% 8% 9% 12% 10% 12% 13% 18%	3519
February	1st to 10th	Day	8% 4 12% 9% 10% 12% 8% 10% 9% 18%	1335
	11th to 20th	Day	2 5% 4 11% 7% 7% 10% 9% 11% 10% 23%	1568
	21st to end	Day	2 6% 3 9% 9% 11% 10% 8% 12% 10% 20%	1463
March	1st to 10th	Day	3 4 3 10% 6% 8% 10% 9% 11% 10% 28%	4383
	11th to 20th	Day	3 9% 4 10% 7% 9% 9% 8% 10% 10% 22%	4920
	21st to end	Day	5% 11% 7% 16% 8% 7% 7% 5% 5% 7% 23%	5898
April	1st to 10th	Day	6% 13% 5% 10% 7% 6% 7% 6% 5% 8% 27%	2730
	11th to 20th	Day	6% 10% 4 11% 10% 9% 7% 5% 6% 7% 24%	2875
	21st to end	Day	10% 17% 5% 13% 10% 7% 5% 3 5% 6% 19%	3150
May	1st to 10th	Day	10% 16% 6% 17% 13% 7% 6% 4 5% 5% 14%	9406
	11th to 20th	Day	12% 19% 5% 14% 7% 5% 4 3 4 5% 21%	9977
	21st to end	Day	6% 13% 6% 17% 8% 7% 6% 4 6% 7% 21%	11632
June	1st to 10th	Day	18% 14% 7% 13% 8% 5% 4 4 5% 6% 18%	3990
	11th to 20th	Day	15% 14% 5% 9% 5% 5% 5% 4 7% 7% 23%	3990
	21st to end	Day	21% 16% 5% 10% 5% 5% 4 4 5% 6% 20%	3990
July	1st to 10th	Day	26% 11% 3 8% 5% 5% 5% 4 5% 7% 22%	8789
	11th to 20th	Day	26% 12% 4 7% 5% 5% 5% 4 5% 5% 23%	8475
	21st to end	Day	17% 8% 3 8% 5% 6% 5% 4 6% 8% 29%	8613
August	1st to 10th	Day	22% 11% 4 9% 5% 6% 5% 4 5% 7% 22%	5282
	11th to 20th	Day	16% 9% 3 8% 5% 5% 4 3 5% 7% 35%	4824
	21st to end	Day	28% 12% 4 9% 4 4 4 3 5% 6% 22%	4986
September	1st to 10th	Day	21% 15% 5% 10% 6% 4 4 3 5% 5% 21%	2600
	11th to 20th	Day	21% 19% 6% 12% 7% 5% 4 3 4 6% 13%	2323
	21st to end	Day	23% 20% 5% 11% 5% 4 5% 3 4 4 15%	2196
October	1st to 10th	Day	21% 22% 8% 10% 4 3 4 3 4 5% 16%	1892
	11th to 20th	Day	15% 18% 8% 13% 6% 5% 4 3 5% 5% 17%	1745
	21st to end	Day	12% 19% 8% 14% 6% 5% 6% 3 5% 6% 16%	1633
November	1st to 10th	Day	5% 11% 5% 18% 10% 8% 6% 5% 8% 9% 16%	1323
	11th to 20th	Day	11% 17% 7% 15% 9% 6% 5% 5% 6% 6% 12%	1097
	21st to end	Day	9% 18% 7% 16% 8% 7% 5% 4 6% 7% 13%	955
December	1st to 10th	Day	2 7% 4 16% 10% 7% 7% 6% 9% 13% 19%	1068
	11th to 20th	Day	2 11% 2 11% 10% 9% 9% 8% 9% 10% 18%	1170
	21st to end	Day	2 10% 7% 15% 8% 10% 7% 7% 6% 11% 17%	1551
January	1st to 10th	Night	4 16% 6% 14% 10% 8% 8% 5% 7% 8% 14%	10943
	11th to 20th	Night	3 10% 7% 20% 12% 9% 8% 6% 8% 8% 10%	10361
	21st to end	Night	1 5% 4 12% 9% 10% 12% 8% 11% 12% 17%	10714
February	1st to 10th	Night	1 7% 4 12% 10% 10% 11% 9% 10% 9% 18%	3285
	11th to 20th	Night	2 5% 4 10% 8% 9% 9% 7% 11% 10% 26%	2935
	21st to end	Night	2 7% 3 10% 9% 6% 13% 8% 11% 10% 20%	2343
March	1st to 10th	Night	3 6% 2 8% 7% 7% 11% 10% 11% 9% 25%	5674
	11th to 20th	Night	3 10% 4 11% 8% 10% 10% 7% 9% 9% 20%	5259
	21st to end	Night	4 10% 6% 19% 10% 10% 9% 6% 6% 5% 17%	5275
April	1st to 10th	Night	7% 14% 5% 11% 8% 7% 6% 4 6% 5% 27%	1890
	11th to 20th	Night	4 12% 5% 13% 11% 9% 7% 7% 6% 6% 20%	1714
	21st to end	Night	10% 18% 5% 14% 9% 7% 5% 3 5% 4 19%	1470
May	1st to 10th	Night	10% 16% 6% 19% 11% 6% 5% 3 4 5% 15%	3533
	11th to 20th	Night	12% 23% 6% 13% 7% 5% 5% 3 4 5% 18%	2945
	21st to end	Night	7% 15% 9% 16% 8% 6% 5% 4 5% 5% 21%	2591
June	1st to 10th	Night	20% 17% 6% 11% 4 5% 4 4 5% 5% 18%	630
	11th to 20th	Night	13% 16% 4 9% 7% 5% 5% 3 5% 8% 26%	630
	21st to end	Night	25% 17% 4 9% 4 5% 3 4 4 3 23%	630
July	1st to 10th	Night	30% 11% 4 7% 4 5% 4 3 5% 4 23%	1410
	11th to 20th	Night	26% 12% 4 11% 5% 6% 5% 3 5% 5% 20%	1737
	21st to end	Night	21% 8% 2 8% 6% 4 5% 5% 6% 9% 27%	2491
August	1st to 10th	Night	24% 12% 3 8% 6% 4 5% 3 4 5% 26%	1874
	11th to 20th	Night	18% 7% 3 7% 4 4 4 4 5% 8% 35%	2235
	21st to end	Night	31% 10% 3 8% 4 5% 4 4 5% 6% 20%	2880
September	1st to 10th	Night	23% 12% 4 8% 5% 5% 4 3 5% 6% 25%	1800
	11th to 20th	Night	21% 18% 6% 12% 6% 7% 4 4 4 4 14%	2076
	21st to end	Night	23% 19% 6% 11% 6% 4 4 4 4 4 15%	2204
October	1st to 10th	Night	20% 24% 6% 12% 5% 4 4 3 4 4 13%	2505
	11th to 20th	Night	16% 18% 8% 13% 5% 5% 5% 3 4 6% 16%	2655
	21st to end	Night	11% 21% 7% 16% 6% 6% 4 3 5% 7% 14%	3205
November	1st to 10th	Night	6% 14% 6% 15% 9% 8% 5% 5% 7% 9% 16%	3194
	11th to 20th	Night	10% 19% 8% 16% 8% 6% 4 4 6% 6% 12%	3521
	21st to end	Night	8% 19% 6% 14% 9% 7% 6% 5% 6% 7% 12%	3664
December	1st to 10th	Night	2 8% 5% 17% 11% 8% 7% 6% 10% 11% 17%	6341
	11th to 20th	Night	4 9% 4 14% 9% 9% 8% 6% 8% 9% 19%	7260
	21st to end	Night	2 11% 7% 13% 8% 9% 9% 5% 7% 9% 20%	9669

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	65% 8% 9% 11% 6% 1	1991
	11th to 20th	Day	67% 7% 11% 14% 1	2601
	21st to end	Day	47% 8% 21% 17% 8%	3519
February	1st to 10th	Day	53% 10% 20% 14% 4	1335
	11th to 20th	Day	45% 9% 18% 22% 6%	1575
	21st to end	Day	47% 9% 14% 19% 8% 1	1463
March	1st to 10th	Day	41% 7% 13% 27% 13%	4386
	11th to 20th	Day	52% 5% 15% 15% 12%	4920
	21st to end	Day	62% 4 8% 15% 10%	5898
April	1st to 10th	Day	54% 6% 10% 17% 12% 1	2730
	11th to 20th	Day	59% 5% 10% 19% 7% 1	2875
	21st to end	Day	67% 4 9% 14% 5%	3150
May	1st to 10th	Day	71% 6% 9% 11% 3	9419
	11th to 20th	Day	68% 6% 7% 13% 6%	9981
	21st to end	Day	63% 6% 13% 16% 2	11633
June	1st to 10th	Day	68% 5% 11% 13% 2	3990
	11th to 20th	Day	59% 7% 14% 17% 3	3990
	21st to end	Day	66% 6% 14% 12% 2	3990
July	1st to 10th	Day	62% 6% 19% 12% 1	8696
	11th to 20th	Day	62% 6% 17% 14% 1	8373
	21st to end	Day	51% 7% 26% 15% 2	8372
August	1st to 10th	Day	61% 7% 16% 14% 2	5264
	11th to 20th	Day	48% 6% 15% 24% 7%	4869
	21st to end	Day	65% 6% 15% 13% 2	4986
September	1st to 10th	Day	66% 6% 13% 13% 2	2600
	11th to 20th	Day	73% 5% 13% 8% 1	2323
	21st to end	Day	72% 6% 9% 11% 2	2196
October	1st to 10th	Day	76% 4 10% 8% 2	3074
	11th to 20th	Day	70% 5% 8% 15% 1	2823
	21st to end	Day	68% 7% 11% 12% 2	2618
November	1st to 10th	Day	60% 7% 15% 13% 4	1323
	11th to 20th	Day	68% 8% 13% 10% 1	1097
	21st to end	Day	68% 7% 10% 12% 3	955
December	1st to 10th	Day	54% 9% 21% 13% 3	1068
	11th to 20th	Day	50% 9% 15% 22% 4	1170
	21st to end	Day	56% 6% 9% 18% 10% 1	1551
January	1st to 10th	Night	63% 7% 12% 11% 6% 1	10943
	11th to 20th	Night	67% 6% 13% 13% 1	10419
	21st to end	Night	50% 8% 18% 17% 8%	10714
February	1st to 10th	Night	53% 10% 18% 14% 5%	3285
	11th to 20th	Night	46% 8% 20% 21% 5%	2939
	21st to end	Night	49% 7% 15% 19% 7% 2	2343
March	1st to 10th	Night	41% 7% 14% 25% 13%	5684
	11th to 20th	Night	54% 4 10% 18% 13%	5260
	21st to end	Night	65% 6% 8% 11% 10%	5275
April	1st to 10th	Night	56% 5% 8% 19% 12% 1	1890
	11th to 20th	Night	61% 6% 9% 16% 8% 1	1714
	21st to end	Night	68% 4 8% 13% 6% 1	1470
May	1st to 10th	Night	68% 5% 9% 14% 4	3538
	11th to 20th	Night	66% 6% 8% 13% 7%	2946
	21st to end	Night	61% 6% 15% 15% 2	2592
June	1st to 10th	Night	67% 5% 11% 15% 2	630
	11th to 20th	Night	59% 6% 13% 18% 3	630
	21st to end	Night	68% 4 11% 14% 3	630
July	1st to 10th	Night	64% 5% 17% 13% 1	1395
	11th to 20th	Night	66% 6% 17% 10% 1	1717
	21st to end	Night	52% 7% 25% 13% 3	2418
August	1st to 10th	Night	61% 6% 15% 18% 1	1868
	11th to 20th	Night	47% 7% 17% 26% 3	2256
	21st to end	Night	65% 6% 15% 12% 2	2880
September	1st to 10th	Night	58% 7% 19% 15% 1	1800
	11th to 20th	Night	72% 6% 13% 9% 1	2076
	21st to end	Night	72% 6% 9% 12% 1	2204
October	1st to 10th	Night	79% 4 9% 7% 2	4103
	11th to 20th	Night	71% 5% 11% 10% 2	4319
	21st to end	Night	66% 7% 11% 14% 2	5181
November	1st to 10th	Night	59% 9% 16% 12% 4	3194
	11th to 20th	Night	69% 7% 13% 9% 2	3521
	21st to end	Night	67% 6% 12% 12% 2	3664
December	1st to 10th	Night	56% 9% 22% 11% 3	6341
	11th to 20th	Night	53% 8% 14% 22% 3	7260
	21st to end	Night	55% 7% 10% 20% 6% 2	9669

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	4 5% 14% 33% 30% 14%	146
	11th to 20th	Day	6% 4 15% 31% 31% 13%	220
	21st to end	Day	4 6% 18% 28% 26% 18%	242
February	1st to 10th	Day	1 4 15% 26% 30% 24%	220
	11th to 20th	Day	2 2 12% 27% 32% 25%	220
	21st to end	Day	3 4 18% 29% 27% 20%	261
March	1st to 10th	Day	5% 4 18% 29% 29% 14%	493
	11th to 20th	Day	4 3 18% 25% 33% 16%	540
	21st to end	Day	6% 5% 18% 28% 25% 18%	594
April	1st to 10th	Day	10% 8% 23% 26% 23% 9%	540
	11th to 20th	Day	10% 6% 19% 26% 26% 14%	588
	21st to end	Day	15% 11% 23% 29% 14% 9%	750
May	1st to 10th	Day	17% 8% 21% 25% 20% 9%	853
	11th to 20th	Day	20% 7% 21% 25% 17% 10%	982
	21st to end	Day	16% 6% 19% 27% 20% 11%	1072
June	1st to 10th	Day	22% 8% 16% 24% 20% 10%	990
	11th to 20th	Day	18% 8% 20% 25% 19% 10%	990
	21st to end	Day	29% 7% 20% 24% 15% 5%	990
July	1st to 10th	Day	27% 6% 18% 23% 17% 9%	976
	11th to 20th	Day	31% 6% 17% 21% 18% 6%	972
	21st to end	Day	24% 7% 16% 23% 20% 10%	1074
August	1st to 10th	Day	24% 5% 16% 27% 17% 11%	916
	11th to 20th	Day	29% 7% 18% 19% 18% 8%	717
	21st to end	Day	30% 9% 19% 21% 13% 9%	648
September	1st to 10th	Day	26% 7% 21% 22% 16% 8%	530
	11th to 20th	Day	28% 6% 18% 22% 16% 10%	530
	21st to end	Day	27% 6% 22% 27% 14% 5%	527
October	1st to 10th	Day	27% 11% 18% 22% 18% 4	420
	11th to 20th	Day	23% 6% 19% 22% 20% 10%	420
	21st to end	Day	18% 8% 21% 24% 17% 13%	335
November	1st to 10th	Day	5% 5% 15% 30% 26% 18%	220
	11th to 20th	Day	10% 5% 17% 31% 26% 11%	220
	21st to end	Day	15% 6% 21% 32% 17% 9%	170
December	1st to 10th	Day	5% 5% 18% 38% 22% 13%	110
	11th to 20th	Day	6% 7% 22% 27% 29% 8%	110
	21st to end	Day	6% 3 23% 31% 29% 7%	121
January	1st to 10th	Night	7% 4 13% 24% 35% 17%	1160
	11th to 20th	Night	5% 4 13% 27% 34% 17%	1160
	21st to end	Night	4 5% 16% 31% 29% 14%	1276
February	1st to 10th	Night	3 3 14% 29% 36% 14%	1085
	11th to 20th	Night	4 1 12% 27% 39% 17%	859
	21st to end	Night	4 3 13% 35% 33% 11%	692
March	1st to 10th	Night	4 5% 15% 31% 35% 11%	840
	11th to 20th	Night	7% 4 20% 30% 30% 10%	840
	21st to end	Night	6% 5% 15% 28% 34% 13%	922
April	1st to 10th	Night	12% 5% 22% 37% 19% 6%	630
	11th to 20th	Night	8% 4 17% 34% 29% 8%	526
	21st to end	Night	17% 8% 20% 28% 22% 5%	420
May	1st to 10th	Night	19% 7% 18% 32% 20% 4	420
	11th to 20th	Night	21% 3 19% 33% 18% 7%	414
	21st to end	Night	12% 5% 17% 32% 26% 7%	345
June	1st to 10th	Night	28% 3 14% 28% 25% 1	210
	11th to 20th	Night	18% 8% 20% 30% 22% 3	210
	21st to end	Night	27% 9% 16% 32% 15% 1	210
July	1st to 10th	Night	30% 3 11% 28% 26% 1	205
	11th to 20th	Night	29% 5% 14% 24% 24% 4	347
	21st to end	Night	25% 4 11% 27% 27% 5%	458
August	1st to 10th	Night	22% 6% 13% 27% 27% 5%	398
	11th to 20th	Night	31% 4 12% 29% 20% 4	396
	21st to end	Night	31% 7% 13% 27% 19% 4	511
September	1st to 10th	Night	26% 6% 16% 27% 23% 3	600
	11th to 20th	Night	29% 4 17% 25% 21% 4	730
	21st to end	Night	31% 5% 18% 26% 17% 2	800
October	1st to 10th	Night	27% 9% 19% 27% 16% 3	800
	11th to 20th	Night	24% 7% 19% 27% 18% 5%	830
	21st to end	Night	19% 7% 20% 25% 19% 10%	1001
November	1st to 10th	Night	10% 4 16% 32% 29% 10%	930
	11th to 20th	Night	17% 6% 17% 26% 26% 7%	1111
	21st to end	Night	14% 5% 16% 29% 24% 11%	1160
December	1st to 10th	Night	8% 3 15% 32% 30% 12%	1160
	11th to 20th	Night	8% 5% 19% 28% 28% 12%	1160
	21st to end	Night	6% 4 15% 30% 31% 13%	1276

Page generated at 2026-07-28 03:25:24. Version ac07

Copyright © 2026 Attilla Danko.