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 2024-02-15.

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	14% 12% 6% 10% 8% 5% 6% 6% 6% 7% 20%	76180
	Night	8% 12% 5% 11% 9% 6% 8% 7% 7% 8% 18%	82951
Transparency	Day	62% 7% 14% 14% 4	75795
	Night	59% 8% 14% 14% 5%	82873
Seeing	Day	20% 6% 18% 25% 21% 11%	16152
	Night	14% 4 16% 28% 27% 10%	23070

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	2 4 2 6% 12% 5% 9% 9% 9% 13% 28%	1058
	11th to 20th	Day	5% 16% 4 14% 12% 9% 7% 7% 6% 7% 14%	1377
	21st to end	Day	2 4 3 5% 7% 6% 15% 16% 11% 13% 18%	1887
February	1st to 10th	Day	7% 5% 11% 11% 7% 12% 10% 9% 9% 18%	1207
	11th to 20th	Day	2 4 4 9% 6% 6% 10% 12% 12% 11% 24%	1366
	21st to end	Day	3 6% 4 8% 10% 7% 11% 11% 10% 10% 21%	1251
March	1st to 10th	Day	2 5% 4 12% 10% 7% 8% 10% 9% 10% 24%	1716
	11th to 20th	Day	4 9% 6% 8% 7% 6% 8% 9% 9% 9% 26%	1912
	21st to end	Day	3 8% 6% 12% 9% 5% 8% 7% 6% 10% 26%	2290
April	1st to 10th	Day	7% 13% 5% 9% 9% 5% 7% 7% 5% 7% 27%	2340
	11th to 20th	Day	7% 9% 5% 9% 11% 7% 8% 7% 6% 7% 25%	2458
	21st to end	Day	12% 16% 6% 11% 11% 6% 6% 4 5% 6% 18%	2700
May	1st to 10th	Day	14% 12% 6% 12% 13% 5% 5% 5% 5% 7% 17%	2870
	11th to 20th	Day	13% 17% 7% 12% 9% 4 6% 5% 5% 6% 16%	3010
	21st to end	Day	12% 15% 8% 13% 9% 5% 6% 6% 6% 7% 14%	3502
June	1st to 10th	Day	18% 12% 8% 12% 9% 4 5% 4 5% 6% 18%	3420
	11th to 20th	Day	13% 12% 6% 8% 6% 4 6% 6% 7% 8% 23%	3420
	21st to end	Day	23% 16% 5% 9% 6% 4 4 5% 5% 6% 18%	3420
July	1st to 10th	Day	25% 10% 4 6% 6% 3 5% 6% 5% 7% 21%	3420
	11th to 20th	Day	25% 12% 4 7% 6% 3 5% 4 5% 6% 23%	3294
	21st to end	Day	21% 9% 4 8% 6% 4 5% 5% 5% 7% 25%	3352
August	1st to 10th	Day	21% 11% 4 9% 5% 4 5% 6% 6% 8% 23%	2912
	11th to 20th	Day	24% 11% 4 8% 7% 4 4 5% 5% 7% 22%	2659
	21st to end	Day	27% 13% 5% 9% 6% 4 4 5% 5% 5% 17%	2750
September	1st to 10th	Day	22% 13% 6% 9% 8% 3 4 4 4 5% 22%	2340
	11th to 20th	Day	20% 19% 6% 11% 8% 4 4 4 4 6% 13%	2093
	21st to end	Day	24% 20% 6% 10% 6% 3 5% 4 4 4 14%	1977
October	1st to 10th	Day	21% 20% 8% 9% 5% 3 3 4 5% 5% 17%	1704
	11th to 20th	Day	14% 17% 7% 11% 8% 4 4 4 5% 6% 19%	1571
	21st to end	Day	12% 18% 9% 12% 7% 4 6% 4 5% 7% 17%	1471
November	1st to 10th	Day	5% 10% 5% 15% 12% 6% 6% 7% 7% 9% 17%	1195
	11th to 20th	Day	11% 15% 7% 13% 11% 5% 6% 6% 6% 7% 13%	993
	21st to end	Day	9% 15% 8% 14% 9% 5% 7% 6% 6% 8% 13%	865
December	1st to 10th	Day	4 11% 6% 13% 11% 6% 7% 5% 7% 10% 20%	604
	11th to 20th	Day	3 10% 4 13% 11% 6% 8% 10% 9% 8% 18%	720
	21st to end	Day	3 12% 8% 17% 13% 8% 7% 5% 5% 10% 11%	1056
January	1st to 10th	Night	1 4 2 7% 11% 7% 11% 10% 11% 12% 23%	5899
	11th to 20th	Night	5% 14% 5% 12% 11% 7% 9% 9% 7% 7% 14%	5603
	21st to end	Night	1 4 3 7% 8% 7% 14% 12% 12% 11% 19%	5778
February	1st to 10th	Night	1 6% 5% 11% 11% 8% 11% 11% 9% 8% 18%	2973
	11th to 20th	Night	2 4 4 7% 8% 7% 10% 10% 12% 10% 26%	2572
	21st to end	Night	3 7% 4 9% 10% 5% 10% 12% 9% 10% 21%	2005
March	1st to 10th	Night	2 7% 5% 10% 11% 5% 9% 10% 11% 9% 22%	2228
	11th to 20th	Night	3 10% 5% 9% 10% 5% 8% 9% 8% 10% 23%	2047
	21st to end	Night	4 10% 5% 12% 8% 6% 8% 8% 7% 6% 24%	2065
April	1st to 10th	Night	8% 14% 6% 10% 8% 5% 6% 5% 5% 5% 28%	1620
	11th to 20th	Night	5% 11% 5% 11% 14% 7% 8% 7% 6% 6% 20%	1468
	21st to end	Night	11% 17% 6% 14% 9% 6% 6% 4 5% 3 18%	1260
May	1st to 10th	Night	14% 16% 6% 10% 13% 5% 6% 4 5% 6% 16%	1087
	11th to 20th	Night	13% 17% 8% 12% 10% 4 6% 5% 5% 6% 15%	885
	21st to end	Night	12% 17% 10% 16% 10% 4 4 5% 5% 5% 12%	772
June	1st to 10th	Night	19% 16% 6% 10% 7% 2 5% 5% 5% 6% 18%	540
	11th to 20th	Night	11% 14% 5% 9% 9% 4 5% 5% 4 7% 26%	540
	21st to end	Night	27% 15% 5% 7% 6% 3 4 4 4 4 22%	540
July	1st to 10th	Night	29% 12% 4 6% 4 4 5% 5% 5% 5% 21%	540
	11th to 20th	Night	28% 11% 3 5% 5% 5% 4 4 6% 6% 24%	664
	21st to end	Night	22% 8% 3 7% 6% 3 5% 6% 6% 9% 22%	966
August	1st to 10th	Night	22% 14% 4 8% 7% 4 5% 5% 5% 6% 21%	1027
	11th to 20th	Night	27% 9% 4 7% 5% 2 4 4 5% 7% 25%	1242
	21st to end	Night	27% 12% 3 8% 6% 3 5% 5% 6% 7% 18%	1586
September	1st to 10th	Night	22% 11% 4 7% 6% 3 5% 4 5% 7% 26%	1620
	11th to 20th	Night	20% 18% 6% 11% 7% 5% 5% 5% 5% 4 15%	1866
	21st to end	Night	25% 19% 7% 9% 7% 2 4 5% 4 4 14%	1983
October	1st to 10th	Night	21% 21% 7% 11% 7% 3 4 4 4 4 14%	2254
	11th to 20th	Night	15% 16% 8% 11% 7% 4 6% 5% 4 7% 18%	2389
	21st to end	Night	12% 20% 8% 14% 8% 5% 5% 4 4 7% 14%	2884
November	1st to 10th	Night	6% 13% 6% 12% 11% 6% 7% 7% 7% 10% 16%	2882
	11th to 20th	Night	11% 18% 9% 13% 9% 4 5% 5% 6% 7% 12%	3185
	21st to end	Night	8% 17% 7% 12% 11% 5% 7% 6% 6% 8% 12%	3314
December	1st to 10th	Night	4 11% 6% 13% 12% 6% 6% 7% 8% 10% 18%	3576
	11th to 20th	Night	4 10% 6% 12% 9% 6% 8% 7% 8% 9% 22%	4480
	21st to end	Night	3 14% 9% 14% 11% 7% 9% 7% 7% 7% 13%	6611

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	40% 13% 17% 18% 11% 1	1059
	11th to 20th	Day	67% 9% 14% 8% 2	1377
	21st to end	Day	46% 8% 14% 18% 15%	1887
February	1st to 10th	Day	53% 10% 18% 15% 4	1207
	11th to 20th	Day	42% 10% 18% 23% 7%	1373
	21st to end	Day	48% 10% 14% 18% 8% 2	1251
March	1st to 10th	Day	48% 10% 19% 16% 7%	1719
	11th to 20th	Day	48% 6% 12% 23% 10%	1912
	21st to end	Day	53% 5% 11% 20% 10%	2290
April	1st to 10th	Day	54% 6% 10% 17% 13% 1	2340
	11th to 20th	Day	59% 5% 10% 18% 7% 1	2458
	21st to end	Day	69% 4 10% 14% 3	2700
May	1st to 10th	Day	69% 5% 10% 12% 4	2870
	11th to 20th	Day	68% 6% 11% 13% 2	3014
	21st to end	Day	72% 5% 11% 10% 2	3502
June	1st to 10th	Day	69% 5% 12% 13% 1	3420
	11th to 20th	Day	58% 8% 15% 16% 3	3420
	21st to end	Day	67% 6% 13% 11% 3	3420
July	1st to 10th	Day	62% 7% 15% 14% 3	3326
	11th to 20th	Day	62% 8% 18% 11% 1	3192
	21st to end	Day	55% 8% 24% 12%	3166
August	1st to 10th	Day	58% 9% 21% 10% 1	2894
	11th to 20th	Day	61% 8% 16% 12% 2	2659
	21st to end	Day	68% 8% 14% 10% 1	2750
September	1st to 10th	Day	65% 5% 14% 14% 2	2340
	11th to 20th	Day	73% 5% 13% 8% 1	2093
	21st to end	Day	73% 6% 8% 11% 2	1977
October	1st to 10th	Day	70% 4 12% 11% 3	1704
	11th to 20th	Day	64% 6% 12% 15% 2	1571
	21st to end	Day	66% 6% 12% 12% 4	1471
November	1st to 10th	Day	59% 8% 16% 12% 4	1195
	11th to 20th	Day	67% 8% 14% 10% 1	993
	21st to end	Day	66% 8% 11% 12% 3	865
December	1st to 10th	Day	57% 7% 12% 19% 5%	604
	11th to 20th	Day	55% 11% 11% 17% 7%	720
	21st to end	Day	65% 8% 11% 12% 5%	1056
January	1st to 10th	Night	43% 10% 19% 15% 11% 2	5899
	11th to 20th	Night	64% 8% 16% 9% 2	5603
	21st to end	Night	46% 8% 12% 20% 14%	5778
February	1st to 10th	Night	53% 11% 16% 14% 6%	2973
	11th to 20th	Night	43% 9% 20% 22% 5%	2576
	21st to end	Night	48% 8% 16% 19% 7% 2	2005
March	1st to 10th	Night	50% 9% 17% 17% 7%	2238
	11th to 20th	Night	50% 5% 12% 22% 10%	2048
	21st to end	Night	55% 7% 11% 17% 10%	2065
April	1st to 10th	Night	57% 4 7% 19% 12% 1	1620
	11th to 20th	Night	60% 6% 9% 16% 9% 1	1468
	21st to end	Night	70% 4 8% 12% 4 1	1260
May	1st to 10th	Night	67% 5% 11% 13% 4	1087
	11th to 20th	Night	68% 5% 9% 15% 2	886
	21st to end	Night	71% 5% 10% 9% 5%	773
June	1st to 10th	Night	67% 5% 11% 15% 1	540
	11th to 20th	Night	59% 6% 14% 18% 3	540
	21st to end	Night	68% 4 11% 13% 4	540
July	1st to 10th	Night	62% 7% 12% 16% 2	525
	11th to 20th	Night	61% 6% 19% 13% 1 1	644
	21st to end	Night	55% 7% 25% 11% 2	912
August	1st to 10th	Night	62% 9% 18% 11% 1	1021
	11th to 20th	Night	58% 9% 19% 11% 3	1242
	21st to end	Night	64% 9% 15% 11% 1	1586
September	1st to 10th	Night	58% 7% 19% 15% 1	1620
	11th to 20th	Night	71% 6% 13% 9% 1	1866
	21st to end	Night	74% 6% 8% 11% 1	1983
October	1st to 10th	Night	74% 5% 9% 10% 3	2254
	11th to 20th	Night	64% 7% 13% 14% 2	2389
	21st to end	Night	67% 7% 12% 10% 4	2884
November	1st to 10th	Night	58% 10% 17% 11% 4	2882
	11th to 20th	Night	69% 7% 14% 9% 1	3185
	21st to end	Night	66% 7% 13% 12% 2	3314
December	1st to 10th	Night	58% 7% 16% 13% 5%	3576
	11th to 20th	Night	52% 9% 12% 23% 4	4480
	21st to end	Night	65% 8% 11% 12% 3	6611

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	2 3 11% 36% 34% 13%	119
	11th to 20th	Day	7% 5% 16% 32% 26% 15%	180
	21st to end	Day	5% 5% 15% 27% 27% 21%	198
February	1st to 10th	Day	1 4 15% 29% 29% 21%	180
	11th to 20th	Day	1 2 8% 27% 33% 29%	168
	21st to end	Day	2 4 19% 26% 30% 19%	199
March	1st to 10th	Day	6% 4 18% 26% 30% 15%	385
	11th to 20th	Day	5% 3 19% 26% 34% 13%	420
	21st to end	Day	5% 6% 18% 29% 24% 18%	462
April	1st to 10th	Day	12% 9% 19% 26% 24% 10%	420
	11th to 20th	Day	10% 6% 16% 24% 28% 16%	459
	21st to end	Day	17% 11% 22% 26% 14% 10%	600
May	1st to 10th	Day	18% 6% 19% 25% 21% 11%	688
	11th to 20th	Day	20% 5% 21% 26% 18% 10%	802
	21st to end	Day	19% 6% 17% 27% 21% 11%	874
June	1st to 10th	Day	23% 6% 15% 23% 21% 12%	810
	11th to 20th	Day	16% 7% 18% 27% 21% 11%	810
	21st to end	Day	31% 7% 20% 22% 15% 5%	810
July	1st to 10th	Day	29% 6% 17% 21% 18% 10%	796
	11th to 20th	Day	31% 6% 16% 21% 18% 7%	792
	21st to end	Day	23% 6% 15% 25% 20% 11%	881
August	1st to 10th	Day	24% 5% 16% 28% 17% 11%	798
	11th to 20th	Day	29% 6% 17% 19% 19% 9%	617
	21st to end	Day	31% 9% 17% 21% 13% 9%	554
September	1st to 10th	Day	26% 6% 20% 23% 17% 8%	450
	11th to 20th	Day	27% 5% 17% 22% 17% 12%	450
	21st to end	Day	30% 6% 19% 26% 14% 5%	448
October	1st to 10th	Day	28% 9% 16% 23% 20% 4	360
	11th to 20th	Day	21% 5% 16% 24% 22% 12%	360
	21st to end	Day	17% 9% 20% 23% 17% 14%	283
November	1st to 10th	Day	6% 5% 14% 30% 27% 18%	180
	11th to 20th	Day	10% 3 14% 31% 29% 13%	180
	21st to end	Day	14% 7% 21% 31% 19% 9%	140
December	1st to 10th	Day	6% 4 21% 36% 23% 10%	90
	11th to 20th	Day	7% 7% 24% 27% 28% 8%	90
	21st to end	Day	6% 3 23% 32% 27% 8%	99
January	1st to 10th	Night	5% 3 13% 24% 37% 19%	1040
	11th to 20th	Night	5% 4 14% 26% 33% 18%	1040
	21st to end	Night	5% 4 15% 30% 31% 15%	1144
February	1st to 10th	Night	3 3 16% 30% 35% 14%	973
	11th to 20th	Night	4 1 10% 27% 40% 19%	752
	21st to end	Night	4 3 12% 34% 34% 13%	592
March	1st to 10th	Night	4 4 15% 30% 34% 12%	720
	11th to 20th	Night	7% 3 20% 31% 29% 9%	720
	21st to end	Night	7% 5% 16% 27% 32% 14%	791
April	1st to 10th	Night	13% 6% 21% 36% 19% 6%	540
	11th to 20th	Night	8% 4 16% 32% 31% 9%	451
	21st to end	Night	18% 7% 21% 27% 21% 6%	360
May	1st to 10th	Night	20% 6% 18% 31% 20% 4	360
	11th to 20th	Night	20% 3 18% 34% 18% 7%	354
	21st to end	Night	14% 5% 18% 32% 24% 6%	295
June	1st to 10th	Night	29% 3 13% 26% 27% 2	180
	11th to 20th	Night	16% 7% 19% 32% 23% 3	180
	21st to end	Night	31% 8% 14% 32% 16%	180
July	1st to 10th	Night	31% 3 10% 26% 27% 2	175
	11th to 20th	Night	29% 5% 12% 24% 25% 4	296
	21st to end	Night	25% 4 11% 28% 28% 5%	394
August	1st to 10th	Night	23% 6% 13% 27% 26% 5%	358
	11th to 20th	Night	30% 4 12% 28% 22% 4	356
	21st to end	Night	32% 5% 14% 27% 18% 4	459
September	1st to 10th	Night	26% 6% 15% 28% 22% 3	540
	11th to 20th	Night	28% 4 17% 24% 22% 5%	656
	21st to end	Night	33% 5% 18% 25% 17% 2	720
October	1st to 10th	Night	27% 7% 18% 28% 17% 3	720
	11th to 20th	Night	22% 6% 19% 28% 19% 6%	744
	21st to end	Night	19% 7% 19% 24% 20% 11%	891
November	1st to 10th	Night	10% 3 15% 32% 28% 11%	830
	11th to 20th	Night	17% 6% 16% 26% 27% 7%	995
	21st to end	Night	14% 5% 17% 28% 23% 13%	1040
December	1st to 10th	Night	8% 3 15% 30% 31% 13%	1040
	11th to 20th	Night	8% 4 18% 29% 28% 12%	1040
	21st to end	Night	6% 4 15% 29% 31% 14%	1144

Page generated at 2024-02-12 06:35:36. Version ac07

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