Salluit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salluit clear sky chart from 2005-11-06 to 2025-10-04.

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	12% 14% 6% 14% 8% 7% 6% 5% 6% 6% 17%	128340
	Night	7% 12% 6% 15% 10% 9% 9% 6% 7% 6% 12%	121530
Transparency	Day	65% 7% 11% 13% 4	131346
	Night	66% 9% 10% 11% 4	126616
Seeing	Day	18% 9% 22% 25% 17% 8%	18732
	Night	13% 7% 21% 29% 21% 8%	26042

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	5% 10% 5% 15% 10% 9% 15% 7% 10% 6% 6%	1839
	11th to 20th	Day	2 11% 7% 18% 13% 13% 10% 7% 7% 4 8%	2194
	21st to end	Day	1 5% 3 11% 11% 11% 14% 13% 15% 10% 5%	2921
February	1st to 10th	Day	1 5% 5% 13% 10% 10% 13% 9% 14% 11% 10%	1372
	11th to 20th	Day	1 4 3 10% 11% 12% 13% 8% 12% 13% 13%	1506
	21st to end	Day	1 7% 2 11% 10% 7% 12% 13% 16% 14% 8%	1453
March	1st to 10th	Day	1 5% 3 10% 11% 11% 13% 11% 13% 12% 10%	4333
	11th to 20th	Day	3 10% 5% 17% 10% 10% 12% 8% 7% 6% 11%	4766
	21st to end	Day	4 8% 5% 20% 13% 11% 10% 6% 7% 5% 12%	5878
April	1st to 10th	Day	5% 11% 5% 14% 9% 10% 9% 7% 7% 6% 18%	2491
	11th to 20th	Day	6% 11% 5% 14% 13% 13% 10% 7% 6% 4 10%	2770
	21st to end	Day	10% 15% 8% 17% 13% 10% 7% 4 4 4 8%	2849
May	1st to 10th	Day	13% 14% 6% 17% 15% 9% 4 3 4 4 12%	7265
	11th to 20th	Day	9% 17% 8% 20% 13% 5% 3 3 3 3 15%	7233
	21st to end	Day	9% 11% 8% 30% 5% 4 3 3 4 5% 17%	8861
June	1st to 10th	Day	13% 19% 10% 15% 6% 5% 4 3 4 5% 17%	3600
	11th to 20th	Day	14% 18% 7% 10% 5% 5% 3 3 5% 7% 23%	3600
	21st to end	Day	16% 17% 5% 8% 4 4 4 4 5% 6% 27%	3600
July	1st to 10th	Day	25% 13% 3 7% 4 4 4 4 4 6% 25%	8159
	11th to 20th	Day	20% 15% 4 9% 5% 5% 4 4 5% 6% 25%	8072
	21st to end	Day	16% 10% 3 8% 5% 5% 5% 4 6% 6% 32%	8155
August	1st to 10th	Day	19% 12% 4 10% 6% 6% 5% 5% 5% 8% 19%	5221
	11th to 20th	Day	15% 10% 3 6% 4 4 5% 4 6% 8% 34%	4668
	21st to end	Day	30% 18% 3 8% 5% 4 4 2 3 4 19%	5038
September	1st to 10th	Day	20% 23% 8% 11% 5% 5% 4 2 4 5% 13%	2481
	11th to 20th	Day	21% 31% 9% 13% 5% 4 3 2 3 3 7%	2400
	21st to end	Day	22% 31% 14% 12% 4 3 2 2 2 3 5%	2110
October	1st to 10th	Day	19% 31% 16% 11% 4 3 3 1 2 3 6%	1911
	11th to 20th	Day	12% 24% 11% 20% 5% 5% 3 3 3 4 11%	1658
	21st to end	Day	10% 20% 9% 22% 7% 6% 5% 3 4 4 10%	1617
November	1st to 10th	Day	7% 19% 6% 27% 10% 7% 5% 4 4 4 7%	1310
	11th to 20th	Day	7% 17% 8% 23% 12% 6% 5% 4 4 6% 9%	1180
	21st to end	Day	3 13% 5% 23% 13% 10% 10% 4 5% 6% 8%	965
December	1st to 10th	Day	1 5% 3 16% 23% 11% 9% 6% 9% 7% 9%	1320
	11th to 20th	Day	4 8% 3 14% 12% 17% 10% 8% 7% 6% 11%	1520
	21st to end	Day	5% 11% 5% 16% 9% 10% 9% 6% 9% 8% 11%	2024
January	1st to 10th	Night	5% 10% 5% 16% 12% 12% 13% 6% 9% 7% 5%	8146
	11th to 20th	Night	3 13% 7% 15% 11% 11% 10% 7% 8% 7% 6%	7728
	21st to end	Night	1 5% 4 12% 12% 13% 12% 9% 15% 10% 6%	8079
February	1st to 10th	Night	1 8% 6% 13% 10% 10% 11% 9% 13% 9% 9%	3025
	11th to 20th	Night	1 4 3 13% 10% 12% 12% 9% 11% 12% 13%	2780
	21st to end	Night	1 6% 3 9% 10% 10% 11% 11% 16% 12% 11%	2175
March	1st to 10th	Night	1 6% 3 11% 12% 13% 14% 11% 11% 8% 8%	5507
	11th to 20th	Night	2 10% 6% 15% 9% 9% 11% 11% 9% 6% 12%	5191
	21st to end	Night	4 8% 6% 22% 13% 10% 8% 6% 7% 6% 10%	5054
April	1st to 10th	Night	5% 11% 5% 14% 10% 9% 8% 6% 8% 9% 16%	1926
	11th to 20th	Night	4 10% 4 12% 12% 14% 13% 9% 7% 5% 10%	1580
	21st to end	Night	9% 16% 7% 15% 10% 10% 9% 5% 5% 3 11%	1549
May	1st to 10th	Night	10% 13% 6% 15% 11% 11% 6% 4 5% 5% 14%	2715
	11th to 20th	Night	10% 15% 5% 17% 18% 8% 4 3 4 3 14%	2702
	21st to end	Night	12% 9% 7% 28% 8% 5% 4 3 5% 4 16%	2056
June	1st to 10th	Night	13% 15% 10% 14% 6% 4 4 3 5% 5% 22%	800
	11th to 20th	Night	16% 14% 6% 10% 5% 5% 4 4 4 7% 25%	800
	21st to end	Night	14% 15% 4 7% 4 4 4 2 5% 9% 32%	800
July	1st to 10th	Night	28% 13% 4 6% 4 4 4 3 5% 4 26%	1840
	11th to 20th	Night	21% 11% 3 7% 5% 4 3 4 5% 6% 29%	1926
	21st to end	Night	12% 10% 5% 7% 5% 4 4 4 6% 6% 38%	2740
August	1st to 10th	Night	16% 12% 4 9% 6% 5% 5% 4 6% 7% 25%	1949
	11th to 20th	Night	14% 10% 2 8% 5% 5% 6% 4 6% 7% 34%	2383
	21st to end	Night	24% 19% 4 10% 4 4 3 2 4 4 21%	2860
September	1st to 10th	Night	21% 21% 8% 11% 5% 4 4 3 3 4 16%	1898
	11th to 20th	Night	20% 29% 10% 13% 6% 4 4 2 3 3 8%	2000
	21st to end	Night	20% 28% 13% 12% 5% 3 3 2 3 3 8%	2288
October	1st to 10th	Night	23% 27% 14% 13% 4 3 2 2 2 3 6%	2336
	11th to 20th	Night	13% 24% 9% 19% 6% 4 4 3 3 3 12%	2521
	21st to end	Night	12% 22% 9% 22% 7% 5% 4 3 4 4 8%	2981
November	1st to 10th	Night	6% 20% 8% 26% 9% 6% 5% 4 4 4 8%	2986
	11th to 20th	Night	6% 19% 7% 23% 10% 8% 7% 4 6% 4 6%	3220
	21st to end	Night	4 13% 7% 19% 11% 12% 8% 6% 6% 5% 8%	3431
December	1st to 10th	Night	2 7% 4 17% 22% 11% 10% 6% 8% 5% 8%	5880
	11th to 20th	Night	5% 9% 4 15% 10% 11% 12% 7% 7% 6% 13%	6702
	21st to end	Night	4 13% 6% 14% 11% 9% 9% 6% 7% 6% 14%	8976

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	67% 12% 8% 10% 3	1840
	11th to 20th	Day	70% 12% 7% 9% 1	2214
	21st to end	Day	59% 9% 9% 12% 11% 1	2921
February	1st to 10th	Day	54% 12% 13% 15% 6%	1372
	11th to 20th	Day	52% 10% 16% 17% 5%	1514
	21st to end	Day	49% 10% 11% 15% 14% 1	1453
March	1st to 10th	Day	55% 8% 12% 18% 9%	4336
	11th to 20th	Day	65% 8% 7% 9% 10% 1	4766
	21st to end	Day	70% 7% 5% 11% 7%	5878
April	1st to 10th	Day	59% 8% 7% 15% 10% 1	2491
	11th to 20th	Day	71% 7% 6% 10% 4 1	2770
	21st to end	Day	76% 7% 7% 8% 2	2849
May	1st to 10th	Day	75% 6% 7% 11% 1	7277
	11th to 20th	Day	71% 7% 5% 6% 9% 1	7237
	21st to end	Day	68% 5% 10% 13% 4	8861
June	1st to 10th	Day	70% 5% 7% 13% 5% 1	3600
	11th to 20th	Day	60% 6% 13% 17% 4	3600
	21st to end	Day	56% 6% 13% 22% 3	3600
July	1st to 10th	Day	59% 6% 14% 19% 1	8071
	11th to 20th	Day	59% 8% 14% 17% 1	7973
	21st to end	Day	50% 7% 20% 22% 1	7922
August	1st to 10th	Day	60% 9% 21% 9% 1	5204
	11th to 20th	Day	47% 7% 16% 21% 9%	4713
	21st to end	Day	69% 6% 10% 14% 2	5037
September	1st to 10th	Day	73% 6% 12% 8% 1	2481
	11th to 20th	Day	84% 5% 6% 5%	2400
	21st to end	Day	87% 4 6% 2 1	2110
October	1st to 10th	Day	74% 6% 7% 11% 1	3158
	11th to 20th	Day	81% 5% 6% 7% 2	2733
	21st to end	Day	72% 9% 8% 9% 1	2646
November	1st to 10th	Day	78% 6% 9% 6% 1	1310
	11th to 20th	Day	74% 8% 11% 6% 1	1180
	21st to end	Day	71% 10% 9% 7% 2	965
December	1st to 10th	Day	64% 15% 12% 8% 1	1320
	11th to 20th	Day	63% 12% 12% 13%	1520
	21st to end	Day	65% 9% 11% 9% 3 3	2024
January	1st to 10th	Night	69% 10% 7% 11% 3	8146
	11th to 20th	Night	69% 10% 10% 11% 1	7783
	21st to end	Night	59% 8% 8% 14% 11% 1	8079
February	1st to 10th	Night	58% 10% 10% 14% 7%	3025
	11th to 20th	Night	54% 10% 12% 16% 7%	2783
	21st to end	Night	49% 10% 12% 15% 14%	2175
March	1st to 10th	Night	60% 8% 9% 15% 8%	5517
	11th to 20th	Night	60% 8% 5% 12% 13% 1	5192
	21st to end	Night	70% 7% 7% 9% 7%	5054
April	1st to 10th	Night	59% 9% 6% 13% 12% 2	1926
	11th to 20th	Night	67% 9% 7% 12% 4 1	1580
	21st to end	Night	72% 7% 8% 10% 3	1549
May	1st to 10th	Night	67% 8% 7% 14% 4	2720
	11th to 20th	Night	72% 8% 5% 5% 8% 3	2703
	21st to end	Night	70% 6% 10% 11% 4	2057
June	1st to 10th	Night	64% 5% 11% 14% 5% 1	800
	11th to 20th	Night	55% 8% 15% 17% 6%	800
	21st to end	Night	50% 5% 13% 27% 5%	800
July	1st to 10th	Night	60% 5% 14% 19% 2	1820
	11th to 20th	Night	51% 9% 17% 22% 1	1902
	21st to end	Night	45% 7% 21% 22% 4	2659
August	1st to 10th	Night	58% 10% 19% 13% 1	1942
	11th to 20th	Night	48% 8% 16% 19% 9% 1	2404
	21st to end	Night	66% 6% 10% 13% 5%	2860
September	1st to 10th	Night	72% 7% 10% 10% 1	1898
	11th to 20th	Night	82% 6% 6% 5% 1	2000
	21st to end	Night	83% 4 7% 5% 1	2288
October	1st to 10th	Night	71% 9% 10% 9% 1	3869
	11th to 20th	Night	81% 5% 6% 6% 2	4185
	21st to end	Night	74% 9% 9% 8% 1	4905
November	1st to 10th	Night	79% 6% 8% 6% 1	2986
	11th to 20th	Night	75% 8% 11% 5%	3220
	21st to end	Night	71% 9% 10% 8% 1	3431
December	1st to 10th	Night	70% 12% 12% 5% 2	5880
	11th to 20th	Night	62% 11% 13% 14% 1	6702
	21st to end	Night	64% 11% 11% 10% 3 1	8976

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	5% 7% 20% 30% 27% 12%	200
	11th to 20th	Day	7% 7% 28% 32% 21% 7%	200
	21st to end	Day	5% 7% 24% 26% 25% 13%	220
February	1st to 10th	Day	1 7% 20% 32% 22% 19%	200
	11th to 20th	Day	2 1 25% 35% 22% 17%	200
	21st to end	Day	4 3 19% 39% 24% 10%	234
March	1st to 10th	Day	7% 6% 24% 29% 20% 14%	430
	11th to 20th	Day	6% 9% 23% 26% 22% 13%	500
	21st to end	Day	5% 9% 27% 26% 22% 12%	550
April	1st to 10th	Day	9% 4 27% 26% 22% 11%	500
	11th to 20th	Day	9% 10% 19% 30% 19% 12%	492
	21st to end	Day	17% 14% 28% 23% 13% 5%	549
May	1st to 10th	Day	17% 9% 27% 24% 17% 6%	903
	11th to 20th	Day	19% 10% 24% 26% 15% 7%	922
	21st to end	Day	16% 10% 26% 26% 17% 6%	1006
June	1st to 10th	Day	19% 7% 22% 29% 13% 9%	930
	11th to 20th	Day	20% 10% 17% 26% 18% 9%	930
	21st to end	Day	22% 10% 20% 20% 19% 9%	930
July	1st to 10th	Day	22% 9% 18% 28% 18% 6%	916
	11th to 20th	Day	26% 9% 19% 25% 14% 7%	912
	21st to end	Day	23% 7% 15% 27% 21% 7%	1013
August	1st to 10th	Day	21% 8% 21% 26% 19% 5%	925
	11th to 20th	Day	28% 9% 18% 24% 14% 7%	627
	21st to end	Day	33% 12% 17% 18% 11% 8%	583
September	1st to 10th	Day	23% 12% 21% 19% 16% 9%	530
	11th to 20th	Day	33% 10% 24% 18% 11% 4	530
	21st to end	Day	31% 15% 26% 17% 10% 2	530
October	1st to 10th	Day	28% 13% 26% 22% 9% 1	492
	11th to 20th	Day	20% 12% 25% 23% 17% 2	338
	21st to end	Day	17% 9% 28% 29% 14% 4	220
November	1st to 10th	Day	13% 11% 25% 23% 19% 11%	200
	11th to 20th	Day	11% 10% 24% 28% 20% 8%	200
	21st to end	Day	7% 9% 22% 35% 22% 7%	200
December	1st to 10th	Day	7% 9% 26% 31% 22% 6%	200
	11th to 20th	Day	9% 11% 26% 29% 17% 10%	200
	21st to end	Day	4 10% 28% 30% 22% 7%	220
January	1st to 10th	Night	4 5% 18% 27% 30% 16%	1100
	11th to 20th	Night	5% 5% 21% 32% 24% 13%	1100
	21st to end	Night	3 5% 18% 32% 28% 13%	1210
February	1st to 10th	Night	4 5% 17% 32% 28% 15%	1013
	11th to 20th	Night	2 2 16% 32% 31% 16%	835
	21st to end	Night	3 2 20% 37% 25% 13%	660
March	1st to 10th	Night	5% 4 20% 31% 30% 10%	800
	11th to 20th	Night	5% 7% 28% 31% 21% 8%	800
	21st to end	Night	6% 7% 22% 30% 25% 10%	880
April	1st to 10th	Night	9% 6% 25% 29% 21% 10%	726
	11th to 20th	Night	7% 6% 19% 34% 24% 10%	396
	21st to end	Night	14% 8% 28% 28% 16% 5%	400
May	1st to 10th	Night	17% 9% 21% 34% 17% 4	400
	11th to 20th	Night	19% 9% 22% 27% 17% 6%	394
	21st to end	Night	15% 7% 20% 32% 19% 6%	433
June	1st to 10th	Night	19% 8% 25% 25% 18% 6%	400
	11th to 20th	Night	24% 7% 18% 27% 20% 5%	400
	21st to end	Night	20% 7% 18% 28% 25% 3	400
July	1st to 10th	Night	23% 6% 17% 29% 21% 3	390
	11th to 20th	Night	23% 6% 16% 29% 22% 3	388
	21st to end	Night	21% 6% 14% 29% 28% 2	438
August	1st to 10th	Night	21% 5% 20% 28% 21% 6%	398
	11th to 20th	Night	27% 5% 19% 23% 24% 3	396
	21st to end	Night	26% 10% 19% 21% 20% 3	440
September	1st to 10th	Night	26% 12% 17% 24% 16% 5%	698
	11th to 20th	Night	31% 11% 21% 24% 10% 3	800
	21st to end	Night	31% 12% 24% 18% 12% 3	800
October	1st to 10th	Night	34% 14% 20% 21% 11% 1	773
	11th to 20th	Night	24% 9% 22% 26% 16% 3	760
	21st to end	Night	19% 9% 21% 29% 17% 6%	866
November	1st to 10th	Night	14% 8% 22% 31% 19% 7%	938
	11th to 20th	Night	11% 11% 29% 25% 17% 7%	1100
	21st to end	Night	7% 9% 23% 30% 21% 9%	1100
December	1st to 10th	Night	8% 6% 21% 33% 22% 9%	1100
	11th to 20th	Night	8% 8% 25% 29% 19% 12%	1100
	21st to end	Night	7% 7% 20% 31% 26% 10%	1210

Page generated at 2025-10-01 01:39:07. Version ac07

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