Sanikiluaq
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sanikiluaq clear sky chart from 2005-11-06 to 2026-03-18.

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% 5% 13% 8% 7% 7% 5% 6% 6% 18%	132039
	Night	11% 16% 6% 16% 9% 8% 8% 6% 6% 4 11%	129840
Transparency	Day	66% 5% 9% 14% 5%	135241
	Night	74% 4 8% 10% 4	134727
Seeing	Day	20% 5% 20% 28% 20% 8%	18299
	Night	20% 5% 19% 29% 21% 7%	26684

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% 15% 8% 23% 15% 11% 13% 5% 2 1 1	3526
	11th to 20th	Day	3 12% 7% 20% 14% 14% 13% 6% 9% 2 1	4009
	21st to end	Day	3 8% 4 12% 8% 12% 18% 12% 17% 4 3	4500
February	1st to 10th	Day	3 13% 4 13% 9% 12% 13% 11% 14% 5% 1	1518
	11th to 20th	Day	3 9% 5% 12% 11% 11% 13% 11% 14% 9% 4	1843
	21st to end	Day	3 6% 3 11% 11% 9% 10% 14% 17% 9% 6%	1557
March	1st to 10th	Day	4 9% 4 14% 9% 11% 12% 17% 11% 6% 4	4491
	11th to 20th	Day	4 14% 5% 12% 9% 9% 10% 9% 9% 7% 13%	5057
	21st to end	Day	6% 10% 4 13% 7% 8% 14% 10% 7% 7% 12%	5602
April	1st to 10th	Day	9% 13% 4 10% 9% 10% 9% 5% 6% 5% 18%	2510
	11th to 20th	Day	8% 11% 6% 13% 10% 11% 8% 4 5% 8% 18%	2572
	21st to end	Day	10% 12% 4 11% 10% 9% 5% 3 6% 6% 24%	2798
May	1st to 10th	Day	12% 11% 5% 15% 10% 8% 6% 4 5% 7% 18%	6612
	11th to 20th	Day	17% 14% 6% 22% 8% 5% 4 3 4 5% 13%	6881
	21st to end	Day	7% 8% 5% 11% 5% 4 4 4 6% 8% 38%	7953
June	1st to 10th	Day	11% 12% 6% 11% 6% 5% 4 4 6% 7% 28%	3200
	11th to 20th	Day	15% 10% 4 6% 4 4 3 4 6% 8% 36%	3376
	21st to end	Day	16% 13% 4 8% 5% 5% 4 4 6% 7% 28%	3400
July	1st to 10th	Day	14% 10% 4 9% 5% 5% 5% 4 6% 8% 31%	7572
	11th to 20th	Day	19% 15% 5% 11% 6% 5% 5% 4 5% 5% 21%	7193
	21st to end	Day	14% 17% 5% 10% 6% 5% 4 4 5% 7% 23%	7428
August	1st to 10th	Day	25% 17% 4 9% 4 3 4 3 4 6% 19%	4892
	11th to 20th	Day	18% 14% 3 7% 3 3 2 2 4 7% 37%	4507
	21st to end	Day	18% 16% 3 8% 5% 4 4 3 5% 6% 28%	4675
September	1st to 10th	Day	22% 18% 4 10% 6% 4 5% 4 4 5% 17%	2468
	11th to 20th	Day	22% 18% 5% 10% 7% 5% 4 3 5% 5% 16%	2365
	21st to end	Day	23% 25% 5% 11% 4 4 4 3 4 4 13%	2114
October	1st to 10th	Day	23% 23% 5% 10% 6% 5% 5% 2 5% 5% 12%	2000
	11th to 20th	Day	22% 29% 8% 12% 6% 5% 3 2 3 4 6%	1919
	21st to end	Day	20% 26% 8% 11% 8% 5% 5% 3 4 4 7%	1760
November	1st to 10th	Day	17% 27% 9% 15% 8% 5% 5% 2 3 3 5%	1646
	11th to 20th	Day	18% 25% 12% 18% 7% 4 4 2 3 3 4	1444
	21st to end	Day	10% 22% 11% 25% 9% 6% 4 3 3 2 4	1260
December	1st to 10th	Day	5% 17% 9% 24% 13% 10% 6% 3 3 3 7%	2020
	11th to 20th	Day	9% 18% 11% 25% 15% 9% 5% 2 2 2 3	2313
	21st to end	Day	11% 17% 10% 22% 17% 10% 6% 4 2 1 2	3058
January	1st to 10th	Night	7% 18% 9% 24% 13% 10% 10% 5% 2 1 1	9428
	11th to 20th	Night	3 15% 7% 19% 13% 12% 12% 8% 8% 1 1	8892
	21st to end	Night	3 9% 4 11% 10% 12% 17% 13% 14% 3 4	9714
February	1st to 10th	Night	5% 11% 4 13% 11% 11% 13% 12% 15% 4 1	3097
	11th to 20th	Night	3 8% 5% 13% 9% 12% 12% 11% 15% 7% 4	2663
	21st to end	Night	3 9% 4 11% 9% 9% 12% 13% 18% 7% 6%	2249
March	1st to 10th	Night	3 8% 6% 17% 10% 9% 11% 13% 10% 6% 6%	5566
	11th to 20th	Night	4 13% 6% 14% 10% 9% 9% 8% 9% 7% 11%	5057
	21st to end	Night	6% 10% 6% 14% 7% 7% 14% 8% 5% 6% 16%	5330
April	1st to 10th	Night	10% 13% 4 12% 8% 8% 9% 5% 6% 7% 18%	1908
	11th to 20th	Night	7% 10% 6% 13% 9% 7% 7% 5% 6% 8% 21%	1777
	21st to end	Night	10% 11% 5% 13% 9% 8% 4 4 6% 7% 23%	1602
May	1st to 10th	Night	15% 11% 5% 15% 9% 6% 4 3 5% 4 23%	3340
	11th to 20th	Night	18% 13% 6% 22% 7% 5% 5% 4 4 3 13%	3037
	21st to end	Night	8% 11% 4 11% 4 3 3 4 5% 7% 38%	2967
June	1st to 10th	Night	13% 12% 7% 12% 4 3 4 4 4 8% 29%	1200
	11th to 20th	Night	14% 10% 5% 8% 4 4 3 3 4 7% 37%	1020
	21st to end	Night	18% 12% 4 8% 5% 5% 5% 4 7% 7% 27%	1000
July	1st to 10th	Night	16% 12% 4 9% 5% 4 4 3 5% 6% 32%	2412
	11th to 20th	Night	20% 14% 5% 10% 6% 4 4 4 5% 6% 24%	2800
	21st to end	Night	14% 18% 5% 12% 5% 3 4 3 4 6% 26%	3446
August	1st to 10th	Night	30% 20% 5% 8% 4 3 3 2 4 5% 16%	2268
	11th to 20th	Night	14% 15% 4 8% 4 3 3 3 5% 6% 35%	2539
	21st to end	Night	15% 16% 4 8% 4 4 4 4 6% 8% 28%	3223
September	1st to 10th	Night	24% 18% 6% 9% 6% 5% 4 3 4 4 17%	1912
	11th to 20th	Night	21% 17% 5% 11% 6% 5% 4 3 5% 6% 18%	2032
	21st to end	Night	23% 26% 4 8% 4 5% 4 3 4 4 15%	2285
October	1st to 10th	Night	23% 23% 4 11% 5% 4 4 3 4 5% 13%	2400
	11th to 20th	Night	22% 30% 6% 11% 5% 4 4 3 4 4 8%	2478
	21st to end	Night	21% 27% 8% 13% 5% 5% 5% 3 4 3 7%	3080
November	1st to 10th	Night	18% 28% 10% 16% 7% 5% 4 3 3 2 5%	2872
	11th to 20th	Night	17% 26% 11% 17% 7% 5% 4 3 3 3 4	3173
	21st to end	Night	11% 25% 11% 23% 9% 5% 4 3 3 2 4	3360
December	1st to 10th	Night	7% 14% 9% 23% 14% 10% 7% 4 4 4 6%	5400
	11th to 20th	Night	10% 19% 7% 26% 16% 11% 4 2 1 1 2	6129
	21st to end	Night	13% 19% 9% 23% 15% 8% 6% 3 2 1 1	8184

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	92% 3 2 2	3527
	11th to 20th	Day	86% 2 5% 6% 1	4036
	21st to end	Day	69% 4 11% 11% 5%	4500
February	1st to 10th	Day	74% 5% 7% 11% 4	1518
	11th to 20th	Day	67% 5% 8% 16% 4	1852
	21st to end	Day	58% 6% 9% 16% 11%	1557
March	1st to 10th	Day	71% 4 7% 11% 7%	4494
	11th to 20th	Day	65% 3 7% 11% 12%	5057
	21st to end	Day	67% 4 7% 14% 8%	5602
April	1st to 10th	Day	66% 4 6% 15% 8% 1	2510
	11th to 20th	Day	64% 4 6% 16% 8% 1	2572
	21st to end	Day	60% 5% 9% 19% 8%	2798
May	1st to 10th	Day	64% 6% 11% 15% 4	6623
	11th to 20th	Day	73% 5% 6% 12% 4	6885
	21st to end	Day	42% 6% 8% 25% 18% 1	7953
June	1st to 10th	Day	54% 6% 10% 20% 9% 1	3200
	11th to 20th	Day	47% 4 12% 24% 12% 1	3376
	21st to end	Day	55% 7% 10% 23% 6%	3400
July	1st to 10th	Day	51% 6% 16% 23% 3	7492
	11th to 20th	Day	64% 6% 8% 17% 4	7106
	21st to end	Day	60% 6% 20% 12% 2	7216
August	1st to 10th	Day	66% 7% 14% 11% 1	4876
	11th to 20th	Day	48% 4 13% 30% 5%	4549
	21st to end	Day	56% 7% 11% 20% 7%	4674
September	1st to 10th	Day	68% 7% 10% 12% 3	2468
	11th to 20th	Day	71% 6% 11% 10% 2	2365
	21st to end	Day	74% 5% 9% 9% 2	2114
October	1st to 10th	Day	69% 7% 14% 8% 2	3260
	11th to 20th	Day	82% 5% 8% 4 1	3098
	21st to end	Day	81% 5% 6% 7% 1	2822
November	1st to 10th	Day	86% 5% 4 4 1	1646
	11th to 20th	Day	88% 4 4 4	1444
	21st to end	Day	86% 5% 5% 3 1	1260
December	1st to 10th	Day	82% 4 8% 5% 1	2020
	11th to 20th	Day	91% 2 4 2	2313
	21st to end	Day	93% 2 3 2	3058
January	1st to 10th	Night	93% 2 3 2	9428
	11th to 20th	Night	86% 3 5% 5% 1	8940
	21st to end	Night	71% 4 10% 10% 5%	9714
February	1st to 10th	Night	73% 4 8% 10% 5%	3097
	11th to 20th	Night	66% 6% 9% 14% 4	2665
	21st to end	Night	61% 6% 9% 15% 8%	2249
March	1st to 10th	Night	69% 4 6% 14% 7%	5576
	11th to 20th	Night	66% 3 10% 8% 12%	5058
	21st to end	Night	67% 3 8% 13% 9%	5330
April	1st to 10th	Night	65% 4 5% 16% 9%	1908
	11th to 20th	Night	59% 5% 7% 20% 9%	1777
	21st to end	Night	59% 5% 9% 19% 7% 1	1602
May	1st to 10th	Night	63% 5% 6% 14% 11%	3346
	11th to 20th	Night	75% 5% 6% 10% 4	3038
	21st to end	Night	44% 5% 8% 22% 20% 1	2968
June	1st to 10th	Night	54% 6% 8% 22% 10% 1	1200
	11th to 20th	Night	48% 4 8% 24% 16%	1020
	21st to end	Night	55% 5% 10% 23% 7%	1000
July	1st to 10th	Night	53% 5% 15% 21% 6% 1	2384
	11th to 20th	Night	61% 4 9% 21% 4	2764
	21st to end	Night	60% 4 18% 15% 3	3344
August	1st to 10th	Night	73% 4 13% 9% 1	2260
	11th to 20th	Night	51% 3 12% 29% 5%	2563
	21st to end	Night	53% 6% 13% 20% 8%	3223
September	1st to 10th	Night	72% 6% 10% 11% 1	1912
	11th to 20th	Night	68% 6% 12% 12% 2	2032
	21st to end	Night	73% 5% 10% 9% 3	2285
October	1st to 10th	Night	67% 6% 15% 10% 2	3920
	11th to 20th	Night	84% 5% 6% 4 1	4038
	21st to end	Night	80% 5% 7% 6% 1	4968
November	1st to 10th	Night	88% 5% 4 2 2	2872
	11th to 20th	Night	87% 5% 4 3	3173
	21st to end	Night	89% 4 3 3 1	3360
December	1st to 10th	Night	81% 4 9% 4 1	5400
	11th to 20th	Night	93% 2 3 2 1	6129
	21st to end	Night	94% 2 3 1	8184

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	11% 3 25% 39% 17% 6%	220
	11th to 20th	Day	12% 3 30% 29% 19% 8%	220
	21st to end	Day	10% 5% 19% 33% 23% 11%	242
February	1st to 10th	Day	6% 4 21% 31% 28% 10%	239
	11th to 20th	Day	4 3 18% 34% 29% 12%	330
	21st to end	Day	6% 3 21% 36% 30% 5%	273
March	1st to 10th	Day	8% 5% 24% 27% 23% 13%	424
	11th to 20th	Day	9% 5% 23% 34% 21% 9%	528
	21st to end	Day	12% 5% 22% 29% 22% 11%	550
April	1st to 10th	Day	14% 3 15% 27% 22% 19%	500
	11th to 20th	Day	13% 3 20% 30% 19% 14%	492
	21st to end	Day	16% 4 19% 28% 21% 12%	500
May	1st to 10th	Day	19% 5% 20% 25% 20% 12%	613
	11th to 20th	Day	17% 5% 22% 31% 17% 7%	765
	21st to end	Day	15% 5% 26% 32% 18% 4	1006
June	1st to 10th	Day	16% 3 21% 30% 20% 10%	930
	11th to 20th	Day	18% 3 21% 32% 19% 6%	930
	21st to end	Day	23% 3 15% 28% 26% 5%	930
July	1st to 10th	Day	21% 3 14% 28% 24% 10%	916
	11th to 20th	Day	20% 4 18% 29% 23% 6%	877
	21st to end	Day	24% 3 12% 24% 27% 10%	794
August	1st to 10th	Day	31% 4 10% 23% 22% 10%	726
	11th to 20th	Day	29% 3 12% 22% 21% 12%	546
	21st to end	Day	25% 6% 14% 26% 20% 8%	583
September	1st to 10th	Day	27% 5% 23% 26% 14% 5%	530
	11th to 20th	Day	29% 6% 21% 27% 13% 3	530
	21st to end	Day	34% 9% 21% 24% 7% 5%	530
October	1st to 10th	Day	32% 11% 25% 23% 7% 2	530
	11th to 20th	Day	34% 8% 24% 22% 10% 2	461
	21st to end	Day	22% 8% 24% 28% 14% 4	242
November	1st to 10th	Day	25% 10% 19% 24% 18% 5%	220
	11th to 20th	Day	25% 9% 23% 25% 14% 4	220
	21st to end	Day	15% 5% 25% 30% 17% 10%	220
December	1st to 10th	Day	15% 7% 30% 24% 20% 5%	220
	11th to 20th	Day	16% 10% 19% 29% 20% 6%	220
	21st to end	Day	12% 5% 25% 35% 19% 5%	242
January	1st to 10th	Night	18% 5% 21% 30% 20% 7%	1160
	11th to 20th	Night	12% 4 19% 36% 23% 7%	1061
	21st to end	Night	7% 3 15% 34% 28% 12%	1155
February	1st to 10th	Night	8% 4 15% 33% 27% 12%	1038
	11th to 20th	Night	6% 2 17% 31% 29% 16%	823
	21st to end	Night	6% 3 22% 32% 27% 10%	692
March	1st to 10th	Night	9% 4 17% 31% 30% 9%	840
	11th to 20th	Night	8% 3 25% 35% 22% 6%	829
	21st to end	Night	12% 4 20% 34% 21% 8%	880
April	1st to 10th	Night	16% 2 19% 29% 23% 10%	708
	11th to 20th	Night	11% 4 18% 32% 24% 11%	593
	21st to end	Night	14% 4 20% 33% 22% 7%	402
May	1st to 10th	Night	20% 5% 20% 29% 20% 7%	400
	11th to 20th	Night	19% 6% 22% 30% 17% 5%	394
	21st to end	Night	15% 4 27% 33% 18% 3	433
June	1st to 10th	Night	19% 2 20% 34% 19% 7%	400
	11th to 20th	Night	17% 5% 17% 35% 23% 3	400
	21st to end	Night	24% 2 12% 33% 26% 5%	400
July	1st to 10th	Night	23% 2 12% 28% 27% 7%	390
	11th to 20th	Night	22% 2 16% 33% 22% 4	388
	21st to end	Night	25% 3 11% 26% 29% 5%	438
August	1st to 10th	Night	36% 2 12% 20% 24% 6%	398
	11th to 20th	Night	29% 3 11% 23% 26% 7%	411
	21st to end	Night	29% 4 15% 25% 17% 9%	660
September	1st to 10th	Night	34% 5% 19% 22% 15% 5%	712
	11th to 20th	Night	30% 4 23% 23% 18% 2	800
	21st to end	Night	39% 7% 19% 19% 13% 3	800
October	1st to 10th	Night	39% 8% 23% 20% 9% 2	800
	11th to 20th	Night	39% 6% 20% 19% 14% 2	800
	21st to end	Night	32% 8% 20% 21% 14% 5%	880
November	1st to 10th	Night	32% 9% 20% 21% 13% 5%	820
	11th to 20th	Night	28% 7% 21% 22% 18% 4	1023
	21st to end	Night	21% 6% 21% 28% 18% 6%	1160
December	1st to 10th	Night	18% 6% 23% 31% 19% 3	1160
	11th to 20th	Night	16% 9% 19% 29% 21% 6%	1160
	21st to end	Night	15% 5% 21% 34% 19% 6%	1276

Page generated at 2026-03-15 02:23:57. Version ac07

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