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 2024-12-06.

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% 15% 5% 12% 7% 7% 6% 5% 6% 6% 18%	103223
	Night	12% 16% 6% 14% 9% 8% 7% 5% 6% 4 12%	96649
Transparency	Day	65% 6% 10% 14% 5%	106449
	Night	73% 4 7% 10% 4	101513
Seeing	Day	20% 4 19% 28% 20% 8%	16679
	Night	20% 5% 19% 28% 21% 7%	24844

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	6% 14% 6% 18% 14% 13% 15% 9% 3 1 1	1898
	11th to 20th	Day	5% 12% 6% 19% 14% 16% 13% 5% 8% 2	2162
	21st to end	Day	5% 12% 5% 11% 8% 11% 13% 9% 18% 5% 4	2431
February	1st to 10th	Day	4 13% 4 12% 9% 12% 13% 12% 15% 5% 1	1372
	11th to 20th	Day	3 8% 5% 12% 11% 11% 13% 11% 14% 9% 3	1663
	21st to end	Day	3 6% 4 10% 11% 9% 10% 15% 18% 9% 5%	1413
March	1st to 10th	Day	6% 11% 3 12% 10% 12% 9% 16% 12% 6% 4	3062
	11th to 20th	Day	4 19% 6% 14% 9% 9% 9% 6% 8% 5% 11%	3480
	21st to end	Day	8% 13% 4 10% 7% 9% 12% 9% 7% 7% 14%	3910
April	1st to 10th	Day	9% 13% 4 10% 9% 11% 9% 5% 6% 5% 18%	2384
	11th to 20th	Day	7% 10% 5% 12% 9% 11% 9% 4 5% 8% 18%	2442
	21st to end	Day	10% 12% 4 11% 10% 9% 5% 3 6% 6% 24%	2658
May	1st to 10th	Day	14% 12% 6% 16% 8% 5% 5% 4 5% 7% 18%	4608
	11th to 20th	Day	17% 16% 8% 21% 6% 4 3 3 4 4 13%	4793
	21st to end	Day	9% 9% 5% 14% 6% 5% 5% 4 6% 7% 32%	5533
June	1st to 10th	Day	11% 12% 6% 11% 6% 5% 4 4 6% 7% 28%	3040
	11th to 20th	Day	16% 10% 4 6% 4 4 4 4 6% 8% 36%	3207
	21st to end	Day	16% 13% 4 8% 5% 5% 4 4 6% 7% 28%	3230
July	1st to 10th	Day	17% 11% 4 9% 5% 5% 5% 5% 6% 8% 26%	5282
	11th to 20th	Day	18% 13% 4 10% 5% 5% 5% 4 5% 6% 24%	5021
	21st to end	Day	13% 13% 4 9% 6% 5% 4 4 6% 8% 29%	5162
August	1st to 10th	Day	25% 17% 4 9% 4 3 4 3 4 6% 19%	4742
	11th to 20th	Day	17% 14% 3 6% 3 3 2 2 4 7% 38%	4367
	21st to end	Day	18% 16% 3 8% 5% 4 4 3 5% 6% 28%	4532
September	1st to 10th	Day	23% 18% 4 10% 5% 4 5% 4 4 5% 17%	2345
	11th to 20th	Day	23% 17% 5% 10% 6% 5% 4 3 5% 5% 17%	2247
	21st to end	Day	23% 24% 5% 10% 4 4 4 3 4 5% 14%	2009
October	1st to 10th	Day	23% 23% 5% 10% 6% 4 5% 2 5% 5% 12%	1900
	11th to 20th	Day	22% 29% 7% 11% 6% 5% 3 2 3 5% 6%	1824
	21st to end	Day	19% 27% 8% 11% 8% 5% 5% 3 4 4 6%	1672
November	1st to 10th	Day	17% 27% 9% 15% 8% 5% 5% 2 2 3 5%	1566
	11th to 20th	Day	18% 24% 12% 18% 7% 4 4 2 3 3 4	1375
	21st to end	Day	10% 22% 11% 24% 9% 6% 4 4 4 2 4	1200
December	1st to 10th	Day	8% 19% 11% 27% 13% 10% 5% 2 1 1 2	1170
	11th to 20th	Day	7% 16% 9% 25% 16% 12% 5% 2 2 2 3	1433
	21st to end	Day	8% 13% 8% 21% 20% 12% 7% 5% 2 1 2	2090
January	1st to 10th	Night	7% 15% 8% 18% 14% 14% 13% 7% 3 1 1	5067
	11th to 20th	Night	5% 17% 6% 17% 13% 13% 12% 8% 7% 1 1	4792
	21st to end	Night	5% 14% 6% 12% 9% 9% 10% 9% 16% 4 6%	5236
February	1st to 10th	Night	5% 11% 3 12% 11% 11% 13% 12% 15% 4 1	2803
	11th to 20th	Night	3 8% 5% 13% 8% 12% 12% 12% 16% 7% 3	2403
	21st to end	Night	3 9% 4 11% 9% 10% 12% 12% 18% 6% 5%	2041
March	1st to 10th	Night	5% 8% 5% 15% 10% 10% 12% 12% 11% 6% 8%	3775
	11th to 20th	Night	4 17% 8% 15% 10% 10% 8% 7% 6% 5% 11%	3479
	21st to end	Night	9% 12% 6% 11% 7% 7% 12% 7% 5% 7% 17%	3722
April	1st to 10th	Night	10% 13% 3 12% 7% 8% 9% 5% 6% 7% 19%	1813
	11th to 20th	Night	7% 9% 6% 13% 9% 7% 8% 5% 6% 9% 22%	1687
	21st to end	Night	10% 11% 5% 12% 9% 8% 4 4 6% 7% 24%	1522
May	1st to 10th	Night	13% 13% 6% 15% 9% 6% 4 3 4 4 21%	2338
	11th to 20th	Night	17% 17% 8% 21% 6% 4 4 4 4 3 13%	2113
	21st to end	Night	11% 10% 5% 13% 5% 4 4 4 5% 6% 33%	2065
June	1st to 10th	Night	13% 12% 7% 11% 4 3 4 5% 5% 8% 29%	1140
	11th to 20th	Night	14% 11% 5% 8% 4 4 3 3 4 7% 36%	969
	21st to end	Night	18% 12% 4 8% 5% 5% 5% 4 7% 7% 26%	950
July	1st to 10th	Night	19% 13% 4 8% 5% 3 3 2 5% 5% 33%	1683
	11th to 20th	Night	20% 12% 5% 9% 6% 4 4 4 5% 6% 25%	1954
	21st to end	Night	15% 15% 4 10% 5% 4 4 3 4 6% 30%	2402
August	1st to 10th	Night	30% 20% 5% 8% 4 3 3 2 4 5% 16%	2198
	11th to 20th	Night	13% 15% 4 8% 4 3 3 3 5% 6% 36%	2459
	21st to end	Night	15% 16% 4 8% 3 4 4 4 6% 8% 28%	3124
September	1st to 10th	Night	25% 18% 6% 9% 6% 5% 4 3 4 4 17%	1816
	11th to 20th	Night	21% 16% 5% 11% 6% 5% 4 3 5% 6% 18%	1930
	21st to end	Night	22% 25% 4 8% 4 5% 4 3 4 5% 16%	2171
October	1st to 10th	Night	24% 23% 4 11% 5% 4 4 3 3 5% 13%	2280
	11th to 20th	Night	22% 30% 6% 11% 5% 4 4 3 4 4 8%	2353
	21st to end	Night	21% 28% 8% 13% 6% 5% 5% 3 4 3 6%	2926
November	1st to 10th	Night	18% 28% 10% 16% 6% 5% 4 3 3 2 5%	2732
	11th to 20th	Night	17% 26% 11% 17% 7% 5% 4 3 3 3 4	3022
	21st to end	Night	11% 24% 11% 23% 9% 6% 4 3 3 3 4	3200
December	1st to 10th	Night	11% 17% 10% 26% 16% 9% 4 2 2 1 2	3127
	11th to 20th	Night	7% 17% 7% 26% 17% 13% 6% 3 2 1 3	3769
	21st to end	Night	11% 16% 7% 20% 19% 10% 7% 4 3 1 1	5588

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	1899
	11th to 20th	Day	88% 3 5% 4 1	2162
	21st to end	Day	68% 4 4 14% 9%	2431
February	1st to 10th	Day	73% 5% 6% 12% 5%	1372
	11th to 20th	Day	67% 5% 9% 15% 5%	1672
	21st to end	Day	58% 7% 9% 15% 11%	1413
March	1st to 10th	Day	70% 5% 7% 13% 5%	3065
	11th to 20th	Day	70% 4 8% 11% 7%	3480
	21st to end	Day	65% 5% 8% 14% 8%	3910
April	1st to 10th	Day	66% 5% 6% 15% 8% 1	2384
	11th to 20th	Day	63% 4 7% 17% 9% 1	2442
	21st to end	Day	59% 5% 9% 19% 8%	2658
May	1st to 10th	Day	64% 7% 10% 16% 3	4622
	11th to 20th	Day	73% 5% 7% 11% 4	4797
	21st to end	Day	49% 7% 9% 23% 13%	5533
June	1st to 10th	Day	54% 6% 10% 21% 8% 1	3040
	11th to 20th	Day	47% 4 12% 24% 12% 1	3207
	21st to end	Day	55% 7% 10% 23% 6%	3230
July	1st to 10th	Day	55% 7% 15% 20% 3	5201
	11th to 20th	Day	60% 7% 11% 19% 4	4934
	21st to end	Day	52% 7% 24% 15% 2	4999
August	1st to 10th	Day	66% 7% 14% 11% 1	4726
	11th to 20th	Day	47% 4 13% 31% 5%	4409
	21st to end	Day	56% 7% 10% 20% 7%	4531
September	1st to 10th	Day	68% 7% 10% 12% 3	2345
	11th to 20th	Day	70% 6% 11% 11% 2	2247
	21st to end	Day	73% 6% 9% 9% 3	2009
October	1st to 10th	Day	69% 7% 15% 8% 2	3160
	11th to 20th	Day	82% 5% 8% 4 1	3003
	21st to end	Day	81% 5% 6% 6% 1	2734
November	1st to 10th	Day	86% 5% 4 4 1	1566
	11th to 20th	Day	88% 4 4 4	1375
	21st to end	Day	86% 5% 5% 3 1	1200
December	1st to 10th	Day	94% 2 2 1	1170
	11th to 20th	Day	92% 2 4 2 1	1433
	21st to end	Day	91% 2 4 2	2090
January	1st to 10th	Night	92% 3 3 2	5067
	11th to 20th	Night	87% 3 4 5% 1	4792
	21st to end	Night	69% 4 6% 13% 9%	5236
February	1st to 10th	Night	72% 4 8% 11% 5%	2803
	11th to 20th	Night	66% 6% 9% 14% 4	2405
	21st to end	Night	62% 6% 9% 14% 8%	2041
March	1st to 10th	Night	67% 5% 7% 16% 5%	3785
	11th to 20th	Night	71% 4 8% 8% 8%	3480
	21st to end	Night	64% 3 10% 13% 9%	3722
April	1st to 10th	Night	65% 5% 5% 16% 9%	1813
	11th to 20th	Night	58% 5% 7% 20% 9%	1687
	21st to end	Night	58% 4 9% 19% 7% 1	1522
May	1st to 10th	Night	65% 6% 8% 15% 6%	2344
	11th to 20th	Night	76% 5% 6% 10% 3	2114
	21st to end	Night	49% 7% 9% 19% 15% 1	2066
June	1st to 10th	Night	53% 6% 8% 23% 9%	1140
	11th to 20th	Night	50% 4 7% 22% 17%	969
	21st to end	Night	56% 5% 11% 21% 7%	950
July	1st to 10th	Night	54% 5% 11% 24% 6%	1655
	11th to 20th	Night	58% 5% 10% 24% 3	1918
	21st to end	Night	56% 4 17% 18% 4	2325
August	1st to 10th	Night	73% 4 13% 9% 1	2190
	11th to 20th	Night	50% 3 12% 29% 5%	2483
	21st to end	Night	53% 6% 13% 20% 8%	3124
September	1st to 10th	Night	72% 6% 10% 11% 1	1816
	11th to 20th	Night	67% 7% 11% 12% 2	1930
	21st to end	Night	72% 5% 10% 10% 3	2171
October	1st to 10th	Night	67% 6% 15% 10% 2	3800
	11th to 20th	Night	85% 5% 6% 4 1	3913
	21st to end	Night	80% 5% 7% 6% 1	4814
November	1st to 10th	Night	88% 5% 3 3 2	2732
	11th to 20th	Night	87% 5% 4 3	3022
	21st to end	Night	88% 4 3 3 1	3200
December	1st to 10th	Night	93% 3 2 1 1	3127
	11th to 20th	Night	93% 2 3 2 1	3769
	21st to end	Night	93% 3 3 1 1	5588

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	12% 2 23% 37% 19% 7%	180
	11th to 20th	Day	14% 3 27% 29% 18% 9%	180
	21st to end	Day	10% 7% 20% 29% 23% 11%	198
February	1st to 10th	Day	7% 4 20% 29% 28% 12%	195
	11th to 20th	Day	4 2 16% 34% 30% 13%	270
	21st to end	Day	6% 3 22% 34% 29% 5%	225
March	1st to 10th	Day	9% 5% 21% 24% 25% 15%	355
	11th to 20th	Day	9% 4 23% 34% 21% 9%	460
	21st to end	Day	13% 5% 23% 26% 22% 11%	506
April	1st to 10th	Day	14% 3 15% 26% 22% 21%	460
	11th to 20th	Day	13% 3 19% 30% 19% 16%	452
	21st to end	Day	17% 3 18% 29% 22% 13%	460
May	1st to 10th	Day	19% 4 19% 25% 20% 13%	567
	11th to 20th	Day	17% 5% 21% 32% 17% 7%	713
	21st to end	Day	16% 5% 25% 32% 19% 4	940
June	1st to 10th	Day	15% 3 20% 31% 20% 10%	870
	11th to 20th	Day	19% 3 20% 32% 20% 7%	870
	21st to end	Day	23% 3 14% 27% 27% 5%	870
July	1st to 10th	Day	22% 3 13% 28% 25% 10%	856
	11th to 20th	Day	20% 3 18% 29% 24% 6%	819
	21st to end	Day	24% 3 10% 24% 28% 11%	739
August	1st to 10th	Day	31% 4 10% 22% 22% 10%	676
	11th to 20th	Day	28% 3 12% 21% 23% 13%	505
	21st to end	Day	27% 6% 14% 24% 21% 8%	539
September	1st to 10th	Day	28% 5% 22% 27% 14% 5%	490
	11th to 20th	Day	30% 4 22% 26% 14% 3	490
	21st to end	Day	33% 8% 21% 25% 8% 4	490
October	1st to 10th	Day	33% 10% 24% 24% 7% 2	490
	11th to 20th	Day	35% 8% 23% 23% 10% 2	426
	21st to end	Day	21% 9% 26% 25% 14% 5%	220
November	1st to 10th	Day	25% 11% 19% 25% 17% 5%	200
	11th to 20th	Day	25% 9% 25% 27% 13% 3	200
	21st to end	Day	14% 5% 25% 30% 17% 10%	200
December	1st to 10th	Day	16% 7% 27% 24% 20% 6%	190
	11th to 20th	Day	16% 9% 17% 31% 21% 5%	180
	21st to end	Day	8% 5% 23% 37% 21% 6%	198
January	1st to 10th	Night	18% 5% 20% 30% 20% 8%	1040
	11th to 20th	Night	12% 4 18% 35% 23% 8%	959
	21st to end	Night	8% 3 15% 32% 29% 12%	1045
February	1st to 10th	Night	9% 4 14% 32% 27% 14%	940
	11th to 20th	Night	6% 1 17% 30% 29% 16%	743
	21st to end	Night	7% 2 21% 33% 27% 10%	628
March	1st to 10th	Night	9% 4 15% 30% 31% 10%	760
	11th to 20th	Night	8% 3 26% 34% 23% 6%	760
	21st to end	Night	13% 4 20% 33% 21% 8%	836
April	1st to 10th	Night	17% 2 19% 29% 23% 10%	673
	11th to 20th	Night	10% 3 18% 33% 24% 12%	563
	21st to end	Night	14% 3 20% 32% 23% 7%	382
May	1st to 10th	Night	19% 5% 20% 29% 20% 7%	380
	11th to 20th	Night	19% 6% 22% 31% 17% 6%	374
	21st to end	Night	16% 4 27% 33% 18% 2	411
June	1st to 10th	Night	18% 2 19% 34% 19% 7%	380
	11th to 20th	Night	18% 5% 18% 34% 23% 3	380
	21st to end	Night	25% 2 10% 32% 26% 5%	380
July	1st to 10th	Night	24% 2 12% 28% 27% 7%	370
	11th to 20th	Night	23% 2 15% 33% 23% 4	368
	21st to end	Night	25% 2 12% 26% 29% 6%	416
August	1st to 10th	Night	38% 1 11% 19% 25% 6%	378
	11th to 20th	Night	28% 3 11% 23% 28% 7%	390
	21st to end	Night	30% 4 15% 24% 18% 9%	627
September	1st to 10th	Night	34% 5% 18% 21% 15% 6%	676
	11th to 20th	Night	30% 3 22% 23% 19% 2	760
	21st to end	Night	39% 6% 19% 20% 13% 3	760
October	1st to 10th	Night	39% 7% 23% 20% 9% 2	760
	11th to 20th	Night	39% 5% 19% 20% 15% 2	760
	21st to end	Night	32% 9% 20% 19% 14% 5%	836
November	1st to 10th	Night	32% 9% 19% 22% 13% 5%	780
	11th to 20th	Night	29% 7% 21% 22% 17% 3	972
	21st to end	Night	21% 6% 21% 28% 18% 6%	1100
December	1st to 10th	Night	19% 6% 22% 30% 20% 3	1073
	11th to 20th	Night	16% 8% 18% 30% 22% 6%	1040
	21st to end	Night	13% 5% 21% 34% 20% 7%	1144

Page generated at 2024-12-03 06:45:11. Version ac07

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