Inuvik
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Inuvik clear sky chart from 2005-11-06 to 2026-04-02.

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	11% 12% 5% 11% 6% 6% 5% 4 6% 7% 26%	137040
	Night	6% 13% 5% 13% 8% 8% 7% 5% 7% 7% 20%	140044
Transparency	Day	56% 7% 14% 18% 5%	136556
	Night	62% 5% 11% 15% 7%	140089
Seeing	Day	15% 4 15% 27% 28% 11%	20915
	Night	13% 3 16% 31% 28% 9%	25042

By Month

Percentage Cloud Cover NW (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	11th to 20th	Day	3 11% 6% 13% 9% 9% 9% 7% 6% 8% 19%	755
	21st to end	Day	6% 16% 7% 15% 10% 9% 10% 6% 8% 6% 9%	2209
February	1st to 10th	Day	2 11% 5% 12% 9% 8% 10% 6% 10% 7% 20%	1089
	11th to 20th	Day	5% 11% 5% 13% 11% 11% 8% 5% 7% 8% 15%	1316
	21st to end	Day	2 10% 5% 11% 11% 8% 9% 8% 10% 6% 19%	1384
March	1st to 10th	Day	2 5% 4 16% 12% 11% 9% 6% 7% 6% 23%	4245
	11th to 20th	Day	2 9% 5% 14% 8% 7% 9% 7% 11% 10% 18%	4741
	21st to end	Day	4 12% 5% 15% 11% 8% 7% 6% 9% 7% 17%	6101
April	1st to 10th	Day	6% 16% 5% 14% 9% 8% 7% 4 5% 6% 20%	2686
	11th to 20th	Day	8% 16% 5% 12% 7% 6% 6% 4 6% 5% 26%	2851
	21st to end	Day	4 10% 4 12% 10% 8% 7% 5% 7% 7% 26%	3210
May	1st to 10th	Day	9% 19% 7% 16% 8% 5% 5% 3 5% 5% 18%	8012
	11th to 20th	Day	6% 15% 7% 19% 6% 4 4 3 4 5% 26%	8705
	21st to end	Day	14% 17% 8% 14% 4 3 3 3 5% 6% 22%	11024
June	1st to 10th	Day	9% 9% 4 8% 5% 4 5% 4 6% 8% 38%	4800
	11th to 20th	Day	10% 8% 3 7% 5% 5% 5% 4 8% 10% 36%	4800
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 7% 9% 39%	4800
July	1st to 10th	Day	17% 8% 3 6% 4 5% 5% 4 7% 8% 34%	10880
	11th to 20th	Day	10% 7% 3 8% 5% 5% 5% 5% 7% 8% 37%	10335
	21st to end	Day	15% 10% 3 8% 5% 5% 4 4 6% 7% 33%	9644
August	1st to 10th	Day	14% 8% 3 7% 4 5% 5% 4 5% 7% 39%	5834
	11th to 20th	Day	19% 13% 4 9% 5% 5% 5% 4 5% 6% 25%	5118
	21st to end	Day	18% 13% 4 10% 6% 6% 6% 4 5% 6% 22%	5265
September	1st to 10th	Day	19% 13% 4 9% 5% 5% 5% 4 6% 7% 24%	2710
	11th to 20th	Day	19% 17% 5% 10% 5% 4 4 3 4 5% 25%	2400
	21st to end	Day	27% 23% 6% 11% 4 4 4 2 3 3 12%	2125
October	1st to 10th	Day	12% 18% 6% 12% 5% 4 4 3 5% 7% 23%	3082
	11th to 20th	Day	8% 23% 10% 18% 7% 5% 6% 4 4 4 10%	2616
	21st to end	Day	8% 17% 7% 14% 9% 7% 8% 4 6% 5% 14%	2344
November	1st to 10th	Day	9% 20% 8% 17% 8% 7% 5% 5% 3 4 15%	1014
	11th to 20th	Day	5% 14% 8% 21% 14% 8% 7% 4 4 4 11%	688
	21st to end	Day	10% 16% 5% 19% 5% 8% 7% 4 7% 6% 12%	257
January	1st to 10th	Night	3 9% 3 13% 8% 11% 12% 8% 7% 8% 20%	14017
	11th to 20th	Night	3 12% 5% 12% 7% 7% 6% 5% 7% 8% 29%	12174
	21st to end	Night	6% 14% 6% 13% 9% 9% 9% 7% 8% 8% 11%	11971
February	1st to 10th	Night	3 10% 5% 13% 8% 9% 9% 7% 10% 8% 18%	3550
	11th to 20th	Night	3 11% 6% 14% 9% 8% 8% 6% 7% 8% 20%	3190
	21st to end	Night	3 9% 5% 14% 12% 9% 6% 5% 9% 7% 22%	2422
March	1st to 10th	Night	2 6% 4 14% 13% 12% 8% 5% 6% 6% 25%	5849
	11th to 20th	Night	1 8% 6% 13% 9% 8% 8% 6% 8% 9% 25%	5441
	21st to end	Night	2 8% 5% 17% 9% 8% 5% 5% 8% 7% 26%	5094
April	1st to 10th	Night	7% 12% 5% 13% 7% 8% 7% 7% 6% 6% 23%	1734
	11th to 20th	Night	5% 17% 5% 11% 7% 5% 5% 3 5% 7% 30%	1496
	21st to end	Night	3 8% 3 9% 10% 8% 6% 5% 6% 9% 33%	1191
May	1st to 10th	Night	9% 17% 8% 17% 10% 5% 4 3 3 5% 18%	1945
	11th to 20th	Night	6% 15% 6% 19% 7% 4 4 3 3 5% 27%	1198
	21st to end	Night	17% 20% 14% 8% 3 1 1 3 4 29%	264
July	11th to 20th	Night	3 2 2 4 3 3 7% 76%	101
	21st to end	Night	16% 10% 3 8% 4 5% 5% 6% 6% 6% 31%	1213
August	1st to 10th	Night	14% 6% 2 7% 5% 5% 5% 3 5% 9% 36%	1314
	11th to 20th	Night	13% 11% 3 9% 5% 6% 6% 5% 8% 7% 29%	1929
	21st to end	Night	20% 11% 4 10% 5% 5% 4 3 6% 6% 26%	2638
September	1st to 10th	Night	15% 13% 3 9% 5% 6% 6% 4 7% 8% 24%	1689
	11th to 20th	Night	19% 17% 5% 8% 5% 4 4 3 5% 6% 23%	2000
	21st to end	Night	24% 26% 6% 11% 5% 4 3 2 3 3 13%	2274
October	1st to 10th	Night	11% 18% 6% 10% 5% 4 4 3 5% 5% 28%	4109
	11th to 20th	Night	10% 21% 9% 19% 9% 6% 6% 3 4 4 9%	4527
	21st to end	Night	8% 14% 6% 16% 9% 7% 6% 5% 6% 6% 17%	5429
November	1st to 10th	Night	8% 20% 8% 16% 8% 7% 5% 3 5% 5% 14%	3487
	11th to 20th	Night	5% 14% 7% 21% 12% 9% 7% 4 5% 4 12%	3932
	21st to end	Night	6% 17% 7% 17% 11% 8% 6% 4 5% 5% 14%	4361
December	1st to 10th	Night	4 14% 6% 13% 8% 8% 7% 5% 6% 7% 22%	8078
	11th to 20th	Night	4 11% 5% 11% 9% 9% 12% 8% 8% 6% 18%	9195
	21st to end	Night	4 17% 7% 15% 9% 7% 7% 6% 6% 5% 17%	12232

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	11th to 20th	Day	62% 5% 14% 13% 5% 1	761
	21st to end	Day	72% 4 10% 8% 5%	2209
February	1st to 10th	Day	57% 5% 10% 18% 9%	1089
	11th to 20th	Day	64% 6% 9% 15% 6% 1	1322
	21st to end	Day	57% 7% 14% 14% 7% 1	1384
March	1st to 10th	Day	59% 6% 8% 14% 13%	4245
	11th to 20th	Day	56% 5% 9% 21% 9%	4741
	21st to end	Day	62% 6% 10% 11% 10% 1	6101
April	1st to 10th	Day	65% 7% 11% 11% 6%	2686
	11th to 20th	Day	59% 6% 14% 16% 5%	2851
	21st to end	Day	55% 7% 14% 19% 5%	3210
May	1st to 10th	Day	69% 6% 7% 14% 3	8012
	11th to 20th	Day	59% 7% 13% 19% 2	8709
	21st to end	Day	63% 5% 13% 14% 4	11025
June	1st to 10th	Day	43% 8% 14% 28% 6%	4800
	11th to 20th	Day	41% 8% 19% 27% 5%	4800
	21st to end	Day	38% 11% 18% 26% 7%	4800
July	1st to 10th	Day	48% 7% 18% 20% 7%	10761
	11th to 20th	Day	44% 7% 17% 28% 4	10200
	21st to end	Day	50% 7% 20% 22% 2	9371
August	1st to 10th	Day	44% 7% 19% 19% 10% 2	5813
	11th to 20th	Day	60% 7% 15% 16% 1	5166
	21st to end	Day	61% 9% 20% 9%	5264
September	1st to 10th	Day	58% 10% 21% 9% 1	2710
	11th to 20th	Day	62% 8% 18% 11% 1	2400
	21st to end	Day	80% 6% 8% 5%	2125
October	1st to 10th	Day	62% 7% 14% 17%	3082
	11th to 20th	Day	76% 6% 8% 8% 1	2616
	21st to end	Day	70% 7% 11% 11% 1	2344
November	1st to 10th	Day	72% 7% 10% 9% 2	1014
	11th to 20th	Day	75% 8% 8% 7% 1	688
	21st to end	Day	70% 8% 8% 10% 4	257
January	1st to 10th	Night	60% 4 7% 16% 13%	14018
	11th to 20th	Night	53% 4 14% 18% 9% 3	12230
	21st to end	Night	67% 6% 11% 10% 6%	11971
February	1st to 10th	Night	57% 7% 11% 17% 8%	3550
	11th to 20th	Night	58% 7% 11% 16% 8%	3194
	21st to end	Night	57% 5% 12% 17% 8% 1	2422
March	1st to 10th	Night	58% 5% 7% 17% 13%	5849
	11th to 20th	Night	53% 4 9% 20% 14%	5443
	21st to end	Night	54% 5% 13% 13% 13% 1	5094
April	1st to 10th	Night	57% 8% 13% 14% 7%	1734
	11th to 20th	Night	53% 5% 14% 21% 7%	1496
	21st to end	Night	47% 6% 18% 22% 7%	1191
May	1st to 10th	Night	70% 5% 8% 14% 3	1945
	11th to 20th	Night	61% 5% 11% 20% 3	1198
	21st to end	Night	64% 7% 18% 11% 1	264
July	11th to 20th	Night	17% 1 15% 62% 5%	101
	21st to end	Night	51% 8% 18% 21% 2	1181
August	1st to 10th	Night	45% 6% 20% 20% 7% 1	1310
	11th to 20th	Night	52% 9% 22% 15% 2	1947
	21st to end	Night	58% 8% 22% 12%	2638
September	1st to 10th	Night	56% 10% 23% 10% 1	1689
	11th to 20th	Night	62% 8% 18% 11% 1	2000
	21st to end	Night	78% 5% 9% 6% 1	2274
October	1st to 10th	Night	58% 6% 14% 22% 1	4109
	11th to 20th	Night	78% 6% 9% 6%	4527
	21st to end	Night	65% 7% 14% 12% 2	5429
November	1st to 10th	Night	73% 7% 11% 8% 1	3487
	11th to 20th	Night	76% 6% 7% 9% 2	3932
	21st to end	Night	72% 6% 8% 11% 3	4361
December	1st to 10th	Night	61% 5% 9% 22% 3	8078
	11th to 20th	Night	63% 5% 7% 19% 6%	9195
	21st to end	Night	66% 6% 6% 16% 6%	12232

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	11th to 20th	Day	9% 4 19% 36% 26% 5%	77
	21st to end	Day	9% 6% 22% 32% 23% 7%	121
February	1st to 10th	Day	6% 6% 16% 31% 27% 13%	154
	11th to 20th	Day	8% 3 20% 31% 28% 10%	298
	21st to end	Day	9% 3 18% 28% 31% 12%	355
March	1st to 10th	Day	4 2 19% 31% 30% 13%	430
	11th to 20th	Day	9% 3 19% 28% 28% 13%	439
	21st to end	Day	7% 6% 16% 26% 30% 15%	594
April	1st to 10th	Day	9% 4 18% 28% 25% 16%	627
	11th to 20th	Day	13% 2 14% 30% 29% 11%	690
	21st to end	Day	7% 2 16% 27% 33% 15%	710
May	1st to 10th	Day	15% 5% 16% 26% 26% 11%	903
	11th to 20th	Day	10% 4 15% 26% 34% 12%	1011
	21st to end	Day	15% 2 13% 29% 32% 9%	1306
June	1st to 10th	Day	12% 5% 18% 31% 25% 9%	1330
	11th to 20th	Day	13% 4 17% 31% 27% 9%	1330
	21st to end	Day	11% 2 13% 30% 31% 13%	1330
July	1st to 10th	Day	15% 4 14% 28% 28% 11%	1306
	11th to 20th	Day	16% 3 14% 25% 32% 11%	1203
	21st to end	Day	17% 3 12% 29% 30% 10%	1188
August	1st to 10th	Day	20% 4 14% 24% 27% 11%	918
	11th to 20th	Day	28% 6% 15% 20% 21% 10%	715
	21st to end	Day	23% 4 15% 21% 26% 11%	803
September	1st to 10th	Day	27% 4 16% 19% 22% 12%	651
	11th to 20th	Day	25% 5% 16% 22% 22% 10%	530
	21st to end	Day	38% 3 15% 20% 17% 6%	488
October	1st to 10th	Day	19% 5% 20% 24% 25% 7%	420
	11th to 20th	Day	22% 4 16% 24% 24% 10%	383
	21st to end	Day	17% 4 15% 29% 26% 9%	242
November	1st to 10th	Day	11% 4 22% 29% 22% 11%	212
	11th to 20th	Day	9% 4 15% 30% 26% 15%	110
	21st to end	Day	24% 12% 29% 29% 5%	41
January	1st to 10th	Night	11% 3 15% 31% 29% 11%	1374
	11th to 20th	Night	9% 3 22% 35% 25% 7%	1270
	21st to end	Night	9% 5% 18% 34% 26% 8%	1324
February	1st to 10th	Night	7% 3 15% 35% 31% 9%	1013
	11th to 20th	Night	6% 3 18% 34% 28% 11%	934
	21st to end	Night	6% 3 18% 34% 28% 11%	783
March	1st to 10th	Night	6% 2 14% 38% 30% 9%	897
	11th to 20th	Night	5% 2 14% 32% 36% 11%	811
	21st to end	Night	7% 1 12% 31% 36% 13%	693
April	1st to 10th	Night	13% 2 10% 27% 34% 14%	603
	11th to 20th	Night	9% 3 14% 36% 30% 8%	520
	21st to end	Night	4 2 17% 37% 31% 10%	400
May	1st to 10th	Night	16% 4 15% 30% 27% 9%	267
	11th to 20th	Night	8% 3 15% 30% 36% 8%	197
	21st to end	Night	13% 3 10% 26% 49%	39
July	11th to 20th	Night	4 26% 35% 30% 4	23
	21st to end	Night	19% 2 9% 38% 28% 4	219
August	1st to 10th	Night	22% 2 15% 36% 23% 3	199
	11th to 20th	Night	25% 5% 11% 28% 27% 4	396
	21st to end	Night	22% 3 12% 25% 30% 8%	572
September	1st to 10th	Night	20% 3 14% 30% 26% 7%	600
	11th to 20th	Night	30% 3 14% 26% 24% 4	600
	21st to end	Night	37% 4 14% 21% 19% 5%	799
October	1st to 10th	Night	21% 4 20% 28% 22% 6%	800
	11th to 20th	Night	23% 2 14% 26% 25% 9%	883
	21st to end	Night	22% 4 14% 25% 26% 10%	1001
November	1st to 10th	Night	17% 3 17% 29% 25% 9%	1120
	11th to 20th	Night	9% 3 16% 30% 26% 14%	1160
	21st to end	Night	12% 4 13% 28% 30% 11%	1267
December	1st to 10th	Night	10% 2 20% 33% 26% 9%	1380
	11th to 20th	Night	10% 3 17% 35% 28% 7%	1380
	21st to end	Night	9% 3 16% 33% 30% 9%	1518

Page generated at 2026-03-30 00:18:46. Version ac07

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