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 2024-11-05.

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% 7% 6% 6% 5% 6% 6% 17%	103353
	Night	8% 13% 6% 14% 9% 9% 8% 6% 8% 7% 13%	95941
Transparency	Day	64% 7% 11% 14% 4	106394
	Night	65% 8% 10% 12% 5%	100993
Seeing	Day	18% 9% 22% 26% 17% 8%	17416
	Night	13% 7% 21% 29% 21% 8%	24822

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	1 5% 4 13% 11% 12% 17% 9% 14% 8% 8%	1279
	11th to 20th	Day	2 9% 4 13% 13% 14% 12% 7% 8% 6% 11%	1537
	21st to end	Day	1 6% 2 11% 8% 10% 10% 13% 18% 14% 7%	2032
February	1st to 10th	Day	1 6% 5% 13% 9% 9% 13% 9% 14% 11% 11%	1303
	11th to 20th	Day	1 4 3 11% 11% 12% 14% 8% 12% 13% 12%	1428
	21st to end	Day	1 8% 3 11% 10% 7% 11% 12% 16% 14% 8%	1382
March	1st to 10th	Day	1 5% 4 10% 10% 8% 10% 8% 15% 15% 14%	3015
	11th to 20th	Day	2 11% 7% 19% 9% 10% 9% 8% 8% 6% 12%	3336
	21st to end	Day	6% 11% 5% 15% 10% 9% 8% 6% 8% 6% 16%	4102
April	1st to 10th	Day	4 11% 5% 14% 9% 10% 9% 7% 7% 6% 19%	2366
	11th to 20th	Day	5% 10% 5% 14% 12% 14% 11% 8% 6% 5% 11%	2630
	21st to end	Day	10% 15% 8% 16% 13% 10% 7% 4 5% 4 8%	2706
May	1st to 10th	Day	11% 16% 6% 15% 8% 7% 5% 5% 6% 6% 16%	5065
	11th to 20th	Day	8% 16% 10% 17% 8% 6% 4 3 3 4 20%	5033
	21st to end	Day	8% 13% 11% 35% 6% 3 3 2 3 3 12%	6168
June	1st to 10th	Day	13% 19% 10% 15% 6% 5% 4 3 4 5% 17%	3420
	11th to 20th	Day	14% 17% 6% 10% 5% 5% 3 3 5% 7% 24%	3420
	21st to end	Day	17% 17% 5% 8% 4 4 4 4 5% 6% 27%	3420
July	1st to 10th	Day	27% 16% 4 8% 4 4 4 4 4 5% 21%	5700
	11th to 20th	Day	17% 15% 3 8% 4 4 4 4 5% 6% 30%	5638
	21st to end	Day	14% 10% 3 7% 5% 5% 5% 4 6% 6% 36%	5670
August	1st to 10th	Day	19% 12% 4 10% 6% 6% 5% 5% 5% 8% 19%	5061
	11th to 20th	Day	15% 9% 3 6% 4 4 5% 4 6% 8% 35%	4523
	21st to end	Day	30% 18% 3 8% 5% 3 4 2 3 4 19%	4884
September	1st to 10th	Day	21% 24% 7% 11% 5% 5% 4 2 4 5% 13%	2357
	11th to 20th	Day	21% 31% 9% 13% 5% 4 3 2 2 3 7%	2280
	21st to end	Day	21% 32% 14% 11% 4 3 2 2 2 3 5%	2005
October	1st to 10th	Day	19% 31% 16% 11% 4 3 3 1 2 3 6%	1881
	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	6% 19% 6% 27% 10% 7% 4 4 4 4 8%	1271
	11th to 20th	Day	7% 18% 8% 23% 12% 5% 5% 4 4 5% 8%	1121
	21st to end	Day	3 13% 5% 22% 13% 11% 10% 4 5% 6% 9%	917
December	1st to 10th	Day	3 9% 5% 14% 16% 11% 11% 6% 8% 7% 11%	760
	11th to 20th	Day	3 7% 4 15% 12% 14% 9% 7% 8% 8% 12%	960
	21st to end	Day	3 9% 5% 19% 11% 13% 8% 8% 11% 8% 6%	1408
January	1st to 10th	Night	1 4 3 14% 14% 14% 15% 8% 11% 10% 7%	5686
	11th to 20th	Night	5% 13% 4 10% 11% 13% 11% 7% 8% 9% 9%	5440
	21st to end	Night	1 6% 3 11% 9% 9% 9% 9% 20% 14% 7%	5646
February	1st to 10th	Night	1 8% 6% 13% 10% 9% 11% 9% 13% 10% 10%	2874
	11th to 20th	Night	1 4 3 13% 11% 12% 11% 9% 11% 12% 12%	2638
	21st to end	Night	1 6% 3 9% 10% 10% 11% 10% 16% 12% 11%	2070
March	1st to 10th	Night	1 6% 3 13% 12% 12% 12% 8% 13% 10% 10%	3825
	11th to 20th	Night	2 12% 6% 17% 11% 9% 8% 7% 9% 5% 14%	3621
	21st to end	Night	5% 11% 7% 16% 10% 7% 7% 7% 8% 8% 14%	3530
April	1st to 10th	Night	5% 11% 5% 13% 10% 9% 8% 6% 8% 9% 16%	1830
	11th to 20th	Night	4 9% 4 12% 12% 15% 13% 9% 7% 5% 11%	1500
	21st to end	Night	9% 16% 7% 15% 10% 9% 9% 5% 6% 3 11%	1472
May	1st to 10th	Night	14% 14% 5% 11% 8% 7% 6% 4 6% 6% 19%	1895
	11th to 20th	Night	9% 15% 6% 18% 9% 8% 5% 4 5% 4 19%	1882
	21st to end	Night	8% 11% 9% 35% 8% 5% 4 3 4 4 8%	1427
June	1st to 10th	Night	13% 15% 9% 14% 6% 4 4 3 5% 4 22%	760
	11th to 20th	Night	16% 14% 5% 8% 5% 5% 4 4 4 8% 27%	760
	21st to end	Night	14% 15% 4 6% 4 4 4 2 5% 9% 33%	760
July	1st to 10th	Night	30% 15% 4 6% 5% 4 4 3 5% 4 21%	1280
	11th to 20th	Night	18% 10% 3 7% 5% 5% 4 4 6% 6% 33%	1340
	21st to end	Night	10% 9% 4 6% 5% 5% 4 3 5% 7% 42%	1904
August	1st to 10th	Night	16% 13% 5% 10% 6% 6% 5% 4 6% 7% 24%	1889
	11th to 20th	Night	14% 9% 2 8% 5% 5% 6% 4 6% 6% 34%	2308
	21st to end	Night	24% 20% 4 10% 4 4 3 2 4 4 20%	2772
September	1st to 10th	Night	21% 21% 8% 11% 5% 4 4 3 3 4 16%	1803
	11th to 20th	Night	20% 30% 9% 12% 6% 3 4 2 3 3 8%	1900
	21st to end	Night	20% 29% 13% 11% 5% 3 3 2 3 3 8%	2173
October	1st to 10th	Night	22% 27% 14% 13% 4 3 2 2 2 3 6%	2299
	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%	2905
	11th to 20th	Night	6% 19% 7% 23% 10% 8% 7% 4 6% 4 6%	3059
	21st to end	Night	4 13% 7% 19% 11% 12% 9% 6% 6% 5% 8%	3259
December	1st to 10th	Night	3 11% 5% 17% 14% 11% 11% 7% 8% 6% 8%	3420
	11th to 20th	Night	3 9% 4 16% 10% 11% 11% 7% 7% 8% 14%	4242
	21st to end	Night	3 12% 6% 17% 14% 11% 10% 7% 8% 6% 7%	6270

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	59% 12% 10% 15% 4	1280
	11th to 20th	Day	61% 15% 9% 12% 2	1537
	21st to end	Day	50% 9% 9% 16% 16% 1	2032
February	1st to 10th	Day	53% 12% 13% 16% 6%	1303
	11th to 20th	Day	53% 10% 14% 17% 5%	1436
	21st to end	Day	49% 10% 11% 15% 14% 1	1382
March	1st to 10th	Day	46% 9% 13% 20% 11%	3018
	11th to 20th	Day	64% 9% 9% 9% 8% 2	3336
	21st to end	Day	61% 8% 7% 14% 9%	4102
April	1st to 10th	Day	59% 8% 7% 15% 10% 1	2366
	11th to 20th	Day	70% 8% 7% 11% 4 1	2630
	21st to end	Day	76% 7% 8% 8% 2	2706
May	1st to 10th	Day	65% 8% 10% 15% 2	5080
	11th to 20th	Day	64% 9% 6% 7% 13% 1	5037
	21st to end	Day	78% 4 7% 10% 1	6168
June	1st to 10th	Day	70% 5% 7% 13% 5%	3420
	11th to 20th	Day	59% 6% 13% 18% 4	3420
	21st to end	Day	56% 6% 13% 23% 3	3420
July	1st to 10th	Day	65% 6% 12% 15% 1	5611
	11th to 20th	Day	54% 9% 16% 21% 1	5539
	21st to end	Day	45% 8% 20% 26% 2	5490
August	1st to 10th	Day	61% 9% 21% 9% 1	5044
	11th to 20th	Day	46% 7% 17% 21% 9%	4568
	21st to end	Day	69% 6% 9% 14% 2	4883
September	1st to 10th	Day	73% 6% 11% 9% 1	2357
	11th to 20th	Day	84% 5% 6% 5%	2280
	21st to end	Day	87% 4 6% 2 1	2005
October	1st to 10th	Day	74% 6% 7% 11% 1	3128
	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	1271
	11th to 20th	Day	75% 8% 11% 6%	1121
	21st to end	Day	71% 10% 9% 7% 2	917
December	1st to 10th	Day	64% 11% 14% 9% 1	760
	11th to 20th	Day	60% 13% 12% 14% 1	960
	21st to end	Day	66% 7% 14% 10% 3 1	1408
January	1st to 10th	Night	62% 11% 8% 15% 4	5686
	11th to 20th	Night	64% 12% 11% 12% 1	5440
	21st to end	Night	49% 8% 9% 18% 15% 1	5646
February	1st to 10th	Night	58% 9% 10% 15% 8%	2874
	11th to 20th	Night	54% 10% 12% 16% 8%	2641
	21st to end	Night	50% 9% 12% 14% 14%	2070
March	1st to 10th	Night	58% 8% 9% 16% 9%	3835
	11th to 20th	Night	64% 8% 5% 11% 10% 2	3622
	21st to end	Night	63% 8% 9% 11% 8%	3530
April	1st to 10th	Night	58% 9% 6% 13% 11% 2	1830
	11th to 20th	Night	66% 9% 7% 13% 4	1500
	21st to end	Night	72% 7% 8% 10% 3	1472
May	1st to 10th	Night	61% 7% 8% 18% 6%	1900
	11th to 20th	Night	65% 9% 6% 6% 11% 4	1883
	21st to end	Night	78% 5% 9% 6% 1	1428
June	1st to 10th	Night	65% 5% 11% 14% 5%	760
	11th to 20th	Night	53% 8% 16% 18% 6%	760
	21st to end	Night	49% 5% 13% 27% 5%	760
July	1st to 10th	Night	65% 5% 11% 16% 3	1260
	11th to 20th	Night	47% 11% 17% 24% 1	1316
	21st to end	Night	40% 9% 21% 25% 5%	1844
August	1st to 10th	Night	58% 10% 18% 12% 1	1882
	11th to 20th	Night	47% 8% 16% 19% 10% 1	2329
	21st to end	Night	66% 6% 10% 14% 5%	2772
September	1st to 10th	Night	72% 7% 10% 10% 1	1803
	11th to 20th	Night	82% 6% 6% 5% 1	1900
	21st to end	Night	83% 4 7% 5% 1	2173
October	1st to 10th	Night	71% 9% 10% 10% 1	3832
	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	78% 7% 8% 6% 1	2905
	11th to 20th	Night	76% 8% 11% 5%	3059
	21st to end	Night	71% 9% 10% 8% 1	3259
December	1st to 10th	Night	69% 10% 12% 7% 2	3420
	11th to 20th	Night	60% 11% 12% 15% 2	4242
	21st to end	Night	69% 9% 10% 9% 2 1	6270

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	3 5% 19% 30% 29% 13%	180
	11th to 20th	Day	8% 6% 29% 31% 19% 7%	180
	21st to end	Day	6% 8% 22% 26% 25% 13%	198
February	1st to 10th	Day	1 8% 21% 32% 21% 18%	180
	11th to 20th	Day	2 25% 34% 23% 16%	180
	21st to end	Day	4 4 18% 38% 25% 11%	211
March	1st to 10th	Day	7% 6% 23% 29% 20% 15%	393
	11th to 20th	Day	6% 7% 23% 27% 23% 14%	460
	21st to end	Day	5% 9% 27% 28% 21% 10%	506
April	1st to 10th	Day	8% 4 28% 27% 22% 11%	460
	11th to 20th	Day	7% 10% 20% 32% 19% 13%	452
	21st to end	Day	17% 14% 29% 22% 13% 5%	506
May	1st to 10th	Day	17% 8% 26% 24% 18% 6%	843
	11th to 20th	Day	19% 9% 24% 26% 15% 7%	862
	21st to end	Day	16% 10% 26% 26% 16% 6%	940
June	1st to 10th	Day	20% 7% 23% 29% 13% 7%	870
	11th to 20th	Day	19% 9% 16% 27% 19% 10%	870
	21st to end	Day	23% 10% 19% 20% 19% 9%	870
July	1st to 10th	Day	22% 9% 18% 28% 18% 6%	856
	11th to 20th	Day	26% 9% 18% 25% 15% 8%	852
	21st to end	Day	22% 7% 15% 27% 22% 7%	947
August	1st to 10th	Day	22% 7% 21% 26% 19% 5%	865
	11th to 20th	Day	27% 8% 19% 24% 14% 7%	582
	21st to end	Day	35% 12% 16% 18% 11% 8%	539
September	1st to 10th	Day	24% 11% 21% 19% 16% 9%	490
	11th to 20th	Day	32% 11% 24% 18% 11% 4	490
	21st to end	Day	32% 14% 26% 17% 9% 2	490
October	1st to 10th	Day	28% 13% 26% 22% 10% 1	480
	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	12% 10% 23% 26% 19% 11%	188
	11th to 20th	Day	10% 10% 23% 26% 22% 9%	180
	21st to end	Day	7% 9% 22% 34% 21% 7%	180
December	1st to 10th	Day	7% 10% 25% 30% 22% 6%	180
	11th to 20th	Day	9% 9% 25% 29% 17% 11%	180
	21st to end	Day	3 8% 28% 31% 22% 8%	198
January	1st to 10th	Night	3 4 17% 27% 31% 17%	1040
	11th to 20th	Night	5% 5% 21% 33% 23% 13%	1040
	21st to end	Night	4 5% 17% 32% 28% 13%	1144
February	1st to 10th	Night	4 5% 18% 32% 27% 15%	962
	11th to 20th	Night	2 2 16% 32% 31% 17%	793
	21st to end	Night	3 3 19% 37% 25% 13%	628
March	1st to 10th	Night	5% 4 21% 31% 28% 11%	760
	11th to 20th	Night	5% 7% 26% 32% 21% 9%	760
	21st to end	Night	6% 7% 22% 31% 24% 9%	836
April	1st to 10th	Night	9% 6% 26% 29% 21% 9%	690
	11th to 20th	Night	6% 6% 20% 34% 23% 10%	376
	21st to end	Night	15% 8% 28% 27% 17% 6%	380
May	1st to 10th	Night	17% 8% 20% 34% 17% 4	380
	11th to 20th	Night	19% 9% 21% 28% 17% 6%	374
	21st to end	Night	15% 8% 21% 32% 19% 6%	411
June	1st to 10th	Night	18% 8% 26% 24% 18% 5%	380
	11th to 20th	Night	24% 7% 16% 28% 21% 6%	380
	21st to end	Night	20% 7% 18% 27% 26% 3	380
July	1st to 10th	Night	22% 6% 17% 30% 21% 4	370
	11th to 20th	Night	23% 6% 16% 29% 23% 4	368
	21st to end	Night	20% 6% 14% 30% 28% 2	416
August	1st to 10th	Night	22% 4 20% 28% 21% 6%	378
	11th to 20th	Night	26% 5% 20% 23% 24% 3	376
	21st to end	Night	26% 11% 19% 22% 20% 3	418
September	1st to 10th	Night	27% 12% 17% 24% 16% 5%	663
	11th to 20th	Night	31% 10% 22% 24% 11% 3	760
	21st to end	Night	31% 12% 26% 17% 11% 3	760
October	1st to 10th	Night	34% 13% 20% 21% 11% 1	760
	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% 7% 23% 31% 18% 7%	909
	11th to 20th	Night	12% 10% 28% 25% 18% 8%	1040
	21st to end	Night	8% 9% 23% 30% 21% 10%	1040
December	1st to 10th	Night	8% 7% 20% 34% 22% 9%	1040
	11th to 20th	Night	8% 7% 24% 30% 19% 12%	1040
	21st to end	Night	7% 6% 20% 31% 26% 10%	1144

Page generated at 2024-11-03 02:11:20. Version ac07

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