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 2024-01-12.

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% 14% 7% 12% 9% 5% 7% 6% 6% 6% 15%	74329
	Night	8% 13% 7% 13% 11% 6% 9% 8% 8% 7% 12%	75401
Transparency	Day	66% 7% 11% 12% 3	73960
	Night	66% 8% 10% 11% 4	75306
Seeing	Day	18% 9% 22% 26% 18% 8%	16150
	Night	13% 7% 21% 29% 22% 9%	23861

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 6% 5% 12% 12% 6% 14% 11% 11% 9% 13%	759
	11th to 20th	Day	2 7% 3 9% 12% 11% 15% 10% 11% 9% 11%	877
	21st to end	Day	2 7% 4 10% 10% 9% 12% 14% 10% 11% 10%	1156
February	1st to 10th	Day	1 5% 5% 11% 11% 7% 12% 12% 14% 11% 10%	1235
	11th to 20th	Day	1 3 3 9% 13% 9% 15% 12% 11% 12% 12%	1351
	21st to end	Day	1 6% 3 9% 12% 5% 10% 15% 17% 15% 8%	1303
March	1st to 10th	Day	2 7% 6% 11% 13% 7% 9% 12% 12% 11% 10%	1733
	11th to 20th	Day	3 8% 4 11% 9% 7% 11% 14% 12% 10% 12%	1892
	21st to end	Day	2 8% 4 11% 11% 9% 13% 11% 10% 7% 14%	2340
April	1st to 10th	Day	4 11% 6% 12% 9% 7% 9% 9% 7% 6% 20%	2241
	11th to 20th	Day	5% 9% 5% 12% 14% 11% 11% 11% 6% 5% 11%	2490
	21st to end	Day	11% 14% 8% 15% 14% 7% 9% 6% 5% 4 8%	2563
May	1st to 10th	Day	12% 16% 9% 18% 14% 7% 6% 4 3 2 9%	2880
	11th to 20th	Day	10% 16% 12% 20% 11% 5% 5% 4 3 4 10%	2833
	21st to end	Day	13% 17% 14% 21% 10% 3 4 3 3 3 9%	3475
June	1st to 10th	Day	13% 17% 11% 14% 7% 4 5% 3 4 5% 18%	3240
	11th to 20th	Day	14% 15% 8% 10% 5% 5% 4 3 5% 7% 24%	3240
	21st to end	Day	17% 16% 5% 7% 5% 3 4 5% 5% 6% 28%	3240
July	1st to 10th	Day	19% 13% 4 8% 5% 3 4 5% 5% 6% 29%	3240
	11th to 20th	Day	22% 12% 4 7% 6% 4 5% 6% 5% 6% 23%	3204
	21st to end	Day	20% 11% 4 6% 6% 3 5% 4 5% 6% 30%	3232
August	1st to 10th	Day	19% 13% 3 9% 8% 5% 6% 6% 5% 7% 19%	2865
	11th to 20th	Day	25% 14% 5% 7% 5% 4 4 4 4 5% 22%	2579
	21st to end	Day	26% 21% 4 8% 6% 3 4 3 3 4 16%	2772
September	1st to 10th	Day	21% 23% 8% 10% 7% 4 5% 3 4 5% 12%	2234
	11th to 20th	Day	21% 30% 9% 12% 7% 3 3 3 3 3 7%	2160
	21st to end	Day	22% 32% 15% 10% 5% 2 2 2 2 3 4	1901
October	1st to 10th	Day	20% 30% 18% 10% 5% 3 2 2 2 3 5%	1782
	11th to 20th	Day	12% 22% 11% 19% 7% 4 3 4 3 4 11%	1571
	21st to end	Day	11% 19% 10% 20% 8% 5% 6% 4 4 4 10%	1532
November	1st to 10th	Day	7% 17% 8% 23% 14% 5% 5% 5% 4 4 8%	1243
	11th to 20th	Day	7% 15% 11% 19% 16% 4 5% 5% 4 5% 8%	1121
	21st to end	Day	3 11% 6% 19% 15% 9% 11% 6% 5% 6% 9%	917
December	1st to 10th	Day	3 9% 6% 11% 17% 9% 13% 8% 8% 7% 11%	760
	11th to 20th	Day	3 6% 5% 12% 14% 11% 11% 10% 9% 8% 12%	960
	21st to end	Day	3 8% 6% 15% 15% 9% 11% 9% 11% 8% 6%	1408
January	1st to 10th	Night	1 6% 5% 11% 13% 8% 14% 10% 12% 10% 11%	3406
	11th to 20th	Night	2 8% 4 8% 12% 10% 15% 12% 10% 9% 9%	3109
	21st to end	Night	1 6% 5% 11% 12% 7% 11% 12% 14% 12% 9%	3200
February	1st to 10th	Night	2 6% 7% 11% 11% 7% 12% 12% 12% 10% 10%	2722
	11th to 20th	Night	1 4 3 12% 12% 8% 14% 12% 11% 11% 12%	2495
	21st to end	Night	1 5% 4 7% 10% 8% 10% 14% 16% 13% 11%	1951
March	1st to 10th	Night	1 6% 4 12% 14% 8% 11% 10% 12% 11% 10%	2214
	11th to 20th	Night	2 9% 4 11% 11% 6% 11% 14% 14% 8% 12%	2065
	21st to end	Night	3 8% 5% 11% 11% 8% 9% 12% 11% 10% 13%	2016
April	1st to 10th	Night	5% 10% 5% 12% 11% 6% 9% 7% 8% 10% 17%	1734
	11th to 20th	Night	4 8% 5% 10% 13% 12% 14% 12% 7% 5% 11%	1420
	21st to end	Night	10% 14% 7% 14% 10% 7% 10% 6% 6% 4 12%	1395
May	1st to 10th	Night	12% 16% 9% 15% 13% 8% 7% 4 3 3 11%	1080
	11th to 20th	Night	13% 11% 6% 18% 16% 5% 6% 4 3 4 12%	1062
	21st to end	Night	11% 15% 12% 20% 11% 3 6% 4 3 3 10%	798
June	1st to 10th	Night	12% 13% 11% 13% 7% 3 4 4 6% 5% 23%	720
	11th to 20th	Night	15% 11% 6% 7% 6% 4 6% 5% 5% 8% 28%	720
	21st to end	Night	14% 13% 5% 5% 5% 3 4 4 5% 9% 34%	720
July	1st to 10th	Night	21% 9% 3 5% 7% 4 5% 5% 5% 5% 31%	720
	11th to 20th	Night	20% 11% 4 7% 6% 3 4 4 6% 6% 29%	754
	21st to end	Night	16% 12% 4 6% 7% 3 4 4 5% 6% 34%	1085
August	1st to 10th	Night	17% 12% 5% 10% 6% 4 6% 6% 6% 6% 22%	1074
	11th to 20th	Night	22% 13% 3 8% 6% 4 5% 5% 5% 5% 25%	1319
	21st to end	Night	21% 20% 5% 9% 7% 4 4 3 4 4 19%	1584
September	1st to 10th	Night	21% 21% 8% 10% 7% 3 4 4 3 4 16%	1707
	11th to 20th	Night	20% 28% 11% 12% 7% 3 4 3 3 3 8%	1800
	21st to end	Night	20% 28% 14% 11% 6% 2 3 3 3 3 7%	2058
October	1st to 10th	Night	22% 26% 15% 13% 5% 2 3 2 2 3 6%	2178
	11th to 20th	Night	13% 23% 9% 18% 7% 3 4 4 3 3 12%	2388
	21st to end	Night	12% 21% 10% 20% 8% 4 4 3 4 4 8%	2824
November	1st to 10th	Night	7% 17% 9% 23% 12% 5% 6% 5% 4 4 8%	2833
	11th to 20th	Night	6% 16% 9% 18% 15% 6% 8% 6% 6% 5% 6%	3059
	21st to end	Night	4 12% 8% 17% 13% 10% 10% 8% 6% 5% 8%	3259
December	1st to 10th	Night	3 9% 6% 15% 15% 8% 12% 9% 8% 6% 8%	3420
	11th to 20th	Night	3 8% 5% 13% 12% 9% 12% 9% 7% 8% 14%	4242
	21st to end	Night	3 12% 6% 14% 16% 8% 11% 10% 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	58% 11% 11% 17% 3	760
	11th to 20th	Day	57% 13% 14% 13% 3	877
	21st to end	Day	57% 8% 11% 13% 10%	1156
February	1st to 10th	Day	54% 12% 13% 16% 5%	1235
	11th to 20th	Day	55% 10% 15% 16% 5%	1359
	21st to end	Day	50% 10% 11% 15% 13% 1	1303
March	1st to 10th	Day	56% 10% 13% 13% 8%	1736
	11th to 20th	Day	54% 11% 11% 14% 9%	1892
	21st to end	Day	58% 10% 8% 17% 7% 1	2340
April	1st to 10th	Day	59% 8% 6% 15% 11% 2	2241
	11th to 20th	Day	69% 8% 7% 11% 5% 1	2490
	21st to end	Day	75% 6% 8% 8% 2	2563
May	1st to 10th	Day	81% 6% 5% 7% 2	2880
	11th to 20th	Day	77% 4 9% 8% 2	2837
	21st to end	Day	80% 4 7% 7% 2	3475
June	1st to 10th	Day	69% 5% 8% 13% 5%	3240
	11th to 20th	Day	58% 6% 14% 18% 4	3240
	21st to end	Day	54% 6% 13% 24% 3	3240
July	1st to 10th	Day	56% 6% 14% 22% 2	3151
	11th to 20th	Day	58% 8% 18% 15% 1	3105
	21st to end	Day	52% 6% 19% 20% 2	3052
August	1st to 10th	Day	61% 10% 18% 9% 1	2848
	11th to 20th	Day	64% 7% 13% 14% 3	2579
	21st to end	Day	72% 6% 11% 11% 1	2772
September	1st to 10th	Day	75% 6% 11% 8%	2234
	11th to 20th	Day	84% 5% 6% 5%	2160
	21st to end	Day	88% 4 5% 2 1	1901
October	1st to 10th	Day	87% 3 4 4 1	1782
	11th to 20th	Day	77% 5% 8% 8% 2	1571
	21st to end	Day	75% 7% 8% 8% 2	1532
November	1st to 10th	Day	78% 6% 9% 6% 1	1243
	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	59% 11% 10% 16% 4	3406
	11th to 20th	Night	60% 10% 13% 15% 2	3109
	21st to end	Night	55% 9% 11% 14% 10% 1	3200
February	1st to 10th	Night	59% 10% 10% 15% 7%	2722
	11th to 20th	Night	55% 11% 12% 15% 7%	2498
	21st to end	Night	50% 10% 12% 14% 13%	1951
March	1st to 10th	Night	58% 8% 12% 14% 7%	2224
	11th to 20th	Night	57% 11% 8% 14% 10%	2066
	21st to end	Night	56% 11% 8% 17% 7%	2016
April	1st to 10th	Night	58% 9% 6% 13% 12% 2	1734
	11th to 20th	Night	67% 9% 8% 13% 4	1420
	21st to end	Night	71% 7% 8% 11% 3	1395
May	1st to 10th	Night	77% 5% 7% 9% 2	1080
	11th to 20th	Night	76% 4 9% 9% 3	1063
	21st to end	Night	78% 5% 8% 6% 2	799
June	1st to 10th	Night	64% 5% 12% 15% 5%	720
	11th to 20th	Night	52% 8% 17% 18% 6%	720
	21st to end	Night	48% 5% 14% 28% 5%	720
July	1st to 10th	Night	51% 7% 15% 23% 5%	700
	11th to 20th	Night	53% 9% 21% 17%	730
	21st to end	Night	50% 8% 18% 22% 2	1025
August	1st to 10th	Night	60% 12% 18% 9% 2	1067
	11th to 20th	Night	60% 8% 13% 17% 3	1319
	21st to end	Night	67% 6% 12% 13% 2	1584
September	1st to 10th	Night	72% 6% 10% 10% 1	1707
	11th to 20th	Night	82% 6% 6% 5% 1	1800
	21st to end	Night	84% 4 7% 4 1	2058
October	1st to 10th	Night	86% 3 5% 4 1	2178
	11th to 20th	Night	78% 6% 6% 8% 3	2388
	21st to end	Night	79% 6% 7% 7% 1	2824
November	1st to 10th	Night	78% 7% 8% 6% 1	2833
	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% 30% 13%	180
	11th to 20th	Day	9% 6% 23% 33% 22% 8%	162
	21st to end	Day	6% 7% 18% 27% 27% 14%	176
February	1st to 10th	Day	1 7% 20% 31% 23% 19%	160
	11th to 20th	Day	3 25% 34% 23% 16%	160
	21st to end	Day	3 4 17% 37% 27% 12%	186
March	1st to 10th	Day	7% 6% 23% 28% 20% 15%	356
	11th to 20th	Day	6% 7% 24% 28% 21% 14%	420
	21st to end	Day	4 9% 28% 28% 21% 10%	462
April	1st to 10th	Day	8% 4 27% 27% 22% 12%	420
	11th to 20th	Day	7% 8% 18% 32% 20% 14%	412
	21st to end	Day	17% 14% 28% 22% 14% 5%	463
May	1st to 10th	Day	17% 9% 26% 25% 17% 6%	783
	11th to 20th	Day	20% 9% 24% 26% 15% 7%	802
	21st to end	Day	17% 11% 25% 25% 16% 6%	874
June	1st to 10th	Day	20% 7% 22% 29% 14% 8%	810
	11th to 20th	Day	18% 8% 16% 27% 20% 10%	810
	21st to end	Day	23% 9% 19% 21% 19% 9%	810
July	1st to 10th	Day	21% 8% 17% 29% 19% 6%	796
	11th to 20th	Day	27% 9% 17% 24% 16% 7%	792
	21st to end	Day	23% 6% 15% 26% 22% 7%	881
August	1st to 10th	Day	21% 7% 20% 26% 20% 6%	805
	11th to 20th	Day	29% 9% 18% 22% 14% 8%	537
	21st to end	Day	35% 12% 16% 18% 11% 8%	495
September	1st to 10th	Day	24% 12% 20% 19% 16% 9%	450
	11th to 20th	Day	33% 10% 23% 18% 11% 5%	450
	21st to end	Day	33% 13% 24% 17% 10% 2	450
October	1st to 10th	Day	28% 11% 27% 22% 9% 2	441
	11th to 20th	Day	19% 11% 25% 24% 17% 2	311
	21st to end	Day	19% 8% 25% 28% 16% 4	198
November	1st to 10th	Day	12% 10% 23% 23% 19% 12%	180
	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% 18%	1040
	11th to 20th	Night	4 4 20% 33% 24% 14%	989
	21st to end	Night	3 4 16% 33% 30% 14%	1078
February	1st to 10th	Night	4 5% 16% 32% 28% 16%	910
	11th to 20th	Night	2 3 16% 32% 31% 17%	750
	21st to end	Night	3 3 17% 37% 26% 14%	592
March	1st to 10th	Night	4 3 21% 32% 28% 11%	720
	11th to 20th	Night	5% 7% 28% 32% 21% 8%	720
	21st to end	Night	6% 7% 22% 31% 24% 10%	792
April	1st to 10th	Night	9% 6% 25% 29% 23% 9%	654
	11th to 20th	Night	7% 6% 19% 34% 24% 11%	356
	21st to end	Night	15% 7% 28% 28% 18% 5%	360
May	1st to 10th	Night	17% 8% 21% 33% 17% 4	360
	11th to 20th	Night	19% 8% 22% 27% 17% 6%	354
	21st to end	Night	15% 8% 22% 31% 19% 5%	389
June	1st to 10th	Night	18% 8% 26% 24% 19% 5%	360
	11th to 20th	Night	23% 6% 15% 28% 22% 6%	360
	21st to end	Night	21% 7% 18% 27% 26% 3	360
July	1st to 10th	Night	21% 6% 18% 31% 21% 4	350
	11th to 20th	Night	24% 6% 16% 28% 23% 3	348
	21st to end	Night	21% 6% 14% 29% 29% 2	394
August	1st to 10th	Night	22% 4 19% 27% 21% 6%	358
	11th to 20th	Night	27% 5% 20% 22% 24% 3	356
	21st to end	Night	26% 9% 19% 23% 20% 3	396
September	1st to 10th	Night	27% 12% 17% 23% 16% 4	627
	11th to 20th	Night	30% 9% 22% 24% 11% 3	720
	21st to end	Night	32% 12% 24% 18% 12% 3	720
October	1st to 10th	Night	33% 13% 20% 21% 11% 1	720
	11th to 20th	Night	23% 9% 23% 27% 16% 3	720
	21st to end	Night	20% 8% 21% 28% 17% 6%	819
November	1st to 10th	Night	14% 7% 22% 31% 19% 7%	885
	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 2024-01-09 07:14:45. Version ac07

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