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 2024-01-16.

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% 11% 5% 9% 8% 4 6% 6% 6% 7% 27%	75704
	Night	8% 13% 6% 11% 10% 6% 7% 7% 6% 6% 19%	77805
Transparency	Day	55% 9% 16% 17% 4	75226
	Night	64% 7% 11% 14% 4	77781
Seeing	Day	15% 4 15% 27% 28% 11%	17911
	Night	14% 3 15% 31% 28% 10%	22011

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	6% 9% 7% 17% 12% 8% 10% 8% 5% 4 15%	236
	21st to end	Day	4 10% 6% 11% 13% 7% 12% 7% 8% 8% 15%	680
February	1st to 10th	Day	3 12% 5% 9% 11% 5% 10% 9% 10% 7% 21%	933
	11th to 20th	Day	5% 10% 5% 11% 13% 8% 11% 7% 7% 8% 15%	1123
	21st to end	Day	2 11% 6% 10% 13% 6% 7% 10% 10% 7% 18%	1184
March	1st to 10th	Day	4 7% 5% 9% 12% 7% 9% 9% 7% 7% 22%	1654
	11th to 20th	Day	4 9% 6% 12% 12% 6% 6% 9% 9% 7% 21%	1832
	21st to end	Day	6% 12% 6% 9% 9% 4 6% 8% 8% 7% 25%	2376
April	1st to 10th	Day	7% 14% 6% 11% 10% 6% 7% 6% 5% 7% 21%	2404
	11th to 20th	Day	9% 14% 6% 11% 9% 4 6% 5% 5% 6% 26%	2561
	21st to end	Day	5% 9% 5% 10% 10% 6% 8% 6% 7% 7% 27%	2888
May	1st to 10th	Day	11% 15% 6% 11% 10% 4 5% 5% 6% 6% 22%	3176
	11th to 20th	Day	7% 12% 6% 10% 8% 3 5% 5% 5% 7% 34%	3407
	21st to end	Day	11% 8% 4 6% 5% 3 4 5% 6% 8% 39%	4319
June	1st to 10th	Day	9% 8% 4 6% 5% 3 5% 6% 6% 8% 39%	4320
	11th to 20th	Day	11% 8% 4 7% 5% 3 5% 5% 8% 10% 34%	4320
	21st to end	Day	11% 6% 3 5% 6% 3 5% 6% 7% 10% 38%	4320
July	1st to 10th	Day	10% 6% 3 5% 6% 4 6% 7% 8% 10% 35%	4320
	11th to 20th	Day	14% 8% 4 8% 8% 4 7% 7% 8% 9% 24%	4113
	21st to end	Day	16% 9% 4 7% 6% 4 6% 6% 7% 8% 26%	3833
August	1st to 10th	Day	17% 9% 4 8% 7% 5% 6% 5% 6% 8% 25%	3218
	11th to 20th	Day	23% 15% 4 9% 7% 4 5% 5% 5% 6% 17%	2831
	21st to end	Day	19% 13% 5% 8% 7% 4 6% 5% 5% 7% 23%	2909
September	1st to 10th	Day	21% 13% 4 8% 6% 3 5% 4 5% 7% 24%	2440
	11th to 20th	Day	18% 16% 5% 9% 6% 3 4 4 4 5% 26%	2160
	21st to end	Day	24% 22% 6% 11% 6% 3 5% 3 3 3 13%	1913
October	1st to 10th	Day	14% 18% 7% 11% 7% 4 5% 4 5% 7% 18%	1696
	11th to 20th	Day	12% 20% 7% 13% 9% 3 6% 5% 5% 5% 15%	1450
	21st to end	Day	11% 21% 9% 12% 10% 4 5% 4 4 4 15%	1315
November	1st to 10th	Day	9% 16% 9% 15% 11% 6% 6% 6% 3 4 16%	916
	11th to 20th	Day	6% 13% 9% 18% 16% 6% 7% 7% 4 4 11%	623
	21st to end	Day	11% 15% 5% 18% 6% 7% 6% 8% 7% 6% 12%	234
January	1st to 10th	Night	7% 14% 6% 12% 11% 5% 9% 7% 7% 6% 17%	4527
	11th to 20th	Night	5% 10% 6% 14% 11% 6% 9% 7% 8% 7% 17%	3848
	21st to end	Night	4 12% 8% 11% 11% 6% 8% 9% 8% 9% 15%	3676
February	1st to 10th	Night	3 10% 5% 11% 8% 6% 9% 9% 9% 9% 19%	3043
	11th to 20th	Night	3 10% 6% 13% 10% 6% 9% 8% 7% 9% 19%	2723
	21st to end	Night	3 8% 6% 13% 13% 7% 7% 6% 8% 7% 23%	2072
March	1st to 10th	Night	4 8% 4 7% 9% 7% 9% 8% 8% 8% 28%	2306
	11th to 20th	Night	3 8% 6% 12% 13% 6% 7% 7% 7% 6% 26%	2125
	21st to end	Night	5% 7% 5% 10% 9% 5% 5% 6% 7% 6% 35%	1980
April	1st to 10th	Night	7% 10% 5% 10% 8% 5% 7% 8% 6% 8% 25%	1553
	11th to 20th	Night	6% 15% 6% 9% 8% 4 5% 4 5% 7% 31%	1346
	21st to end	Night	3 7% 3 8% 10% 7% 7% 6% 6% 10% 34%	1073
May	1st to 10th	Night	9% 14% 8% 9% 8% 5% 5% 5% 5% 6% 27%	781
	11th to 20th	Night	4 9% 7% 10% 6% 4 7% 5% 6% 9% 33%	486
	21st to end	Night	10% 11% 3 4 7% 1 1 1 5% 10% 49%	104
July	11th to 20th	Night	9% 6% 6% 12% 9% 9% 18% 30%	33
	21st to end	Night	15% 7% 3 7% 5% 4 6% 9% 9% 8% 25%	482
August	1st to 10th	Night	15% 9% 3 8% 8% 5% 6% 6% 5% 9% 25%	720
	11th to 20th	Night	21% 13% 4 10% 7% 4 5% 4 6% 4 21%	1068
	21st to end	Night	19% 10% 4 7% 7% 4 4 6% 8% 7% 23%	1445
September	1st to 10th	Night	15% 13% 4 8% 7% 5% 6% 5% 7% 8% 23%	1519
	11th to 20th	Night	20% 15% 5% 7% 6% 3 4 4 5% 7% 24%	1800
	21st to end	Night	22% 25% 7% 10% 6% 4 3 2 4 3 14%	2046
October	1st to 10th	Night	13% 19% 7% 10% 8% 4 4 5% 5% 5% 20%	2265
	11th to 20th	Night	14% 20% 9% 14% 9% 4 5% 4 5% 4 12%	2507
	21st to end	Night	14% 19% 8% 11% 11% 4 5% 4 4 5% 16%	3037
November	1st to 10th	Night	8% 18% 9% 14% 10% 6% 6% 4 5% 5% 15%	3146
	11th to 20th	Night	5% 13% 8% 18% 15% 7% 8% 5% 5% 4 11%	3557
	21st to end	Night	7% 15% 8% 14% 13% 7% 7% 6% 5% 5% 14%	3944
December	1st to 10th	Night	6% 13% 7% 11% 10% 6% 8% 7% 6% 7% 19%	4558
	11th to 20th	Night	5% 13% 7% 11% 11% 7% 10% 8% 8% 6% 13%	5675
	21st to end	Night	5% 15% 6% 11% 10% 6% 8% 9% 7% 6% 17%	8360

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	73% 4 7% 12% 3	236
	21st to end	Day	65% 7% 9% 14% 5%	680
February	1st to 10th	Day	57% 6% 10% 19% 8%	933
	11th to 20th	Day	63% 7% 10% 15% 5%	1129
	21st to end	Day	58% 7% 14% 14% 7% 1	1184
March	1st to 10th	Day	57% 6% 11% 19% 6%	1654
	11th to 20th	Day	59% 7% 12% 19% 3	1832
	21st to end	Day	55% 8% 11% 19% 5% 2	2376
April	1st to 10th	Day	63% 7% 12% 12% 6%	2404
	11th to 20th	Day	59% 6% 14% 16% 4	2561
	21st to end	Day	54% 7% 14% 20% 5%	2888
May	1st to 10th	Day	64% 7% 14% 12% 3	3176
	11th to 20th	Day	50% 7% 15% 25% 3	3411
	21st to end	Day	42% 7% 17% 24% 10% 1	4320
June	1st to 10th	Day	42% 8% 14% 29% 7%	4320
	11th to 20th	Day	44% 9% 18% 25% 4	4320
	21st to end	Day	40% 11% 18% 25% 6%	4320
July	1st to 10th	Day	42% 12% 23% 20% 3	4201
	11th to 20th	Day	54% 12% 18% 15% 1	3978
	21st to end	Day	52% 12% 22% 13% 1	3619
August	1st to 10th	Day	56% 9% 20% 13% 1	3197
	11th to 20th	Day	67% 10% 14% 7% 1	2831
	21st to end	Day	61% 10% 20% 9%	2909
September	1st to 10th	Day	59% 10% 20% 9% 2	2440
	11th to 20th	Day	61% 8% 18% 12% 1	2160
	21st to end	Day	78% 6% 9% 6%	1913
October	1st to 10th	Day	66% 9% 14% 10%	1696
	11th to 20th	Day	71% 8% 11% 9% 1	1450
	21st to end	Day	74% 7% 10% 9% 1	1315
November	1st to 10th	Day	72% 7% 10% 10% 2	916
	11th to 20th	Day	74% 9% 8% 7% 1	623
	21st to end	Day	69% 8% 7% 11% 4	234
January	1st to 10th	Night	67% 5% 10% 12% 6%	4527
	11th to 20th	Night	63% 7% 10% 14% 5% 1	3848
	21st to end	Night	62% 7% 11% 13% 5% 1	3676
February	1st to 10th	Night	56% 7% 12% 17% 8%	3043
	11th to 20th	Night	58% 8% 11% 17% 5%	2727
	21st to end	Night	58% 5% 12% 17% 7% 1	2072
March	1st to 10th	Night	51% 7% 9% 24% 9%	2306
	11th to 20th	Night	57% 4 13% 22% 4	2127
	21st to end	Night	47% 6% 13% 25% 6% 3	1980
April	1st to 10th	Night	54% 8% 14% 15% 8%	1553
	11th to 20th	Night	53% 5% 16% 21% 6%	1346
	21st to end	Night	47% 6% 18% 22% 7%	1073
May	1st to 10th	Night	60% 5% 14% 16% 5%	781
	11th to 20th	Night	49% 6% 13% 27% 5%	486
	21st to end	Night	37% 1 15% 31% 14% 2	104
July	11th to 20th	Night	52% 3 39% 6%	33
	21st to end	Night	50% 12% 21% 15% 2	456
August	1st to 10th	Night	56% 8% 21% 14% 1	716
	11th to 20th	Night	64% 11% 17% 7% 1	1068
	21st to end	Night	58% 10% 21% 11%	1445
September	1st to 10th	Night	58% 10% 21% 10% 1	1519
	11th to 20th	Night	61% 8% 18% 11% 1	1800
	21st to end	Night	77% 5% 10% 7% 1	2046
October	1st to 10th	Night	66% 8% 12% 14%	2265
	11th to 20th	Night	76% 7% 10% 6% 1	2507
	21st to end	Night	71% 7% 11% 9% 1	3037
November	1st to 10th	Night	72% 7% 12% 9% 1	3146
	11th to 20th	Night	76% 6% 7% 9% 2	3557
	21st to end	Night	72% 6% 8% 10% 3	3944
December	1st to 10th	Night	63% 7% 10% 16% 4	4558
	11th to 20th	Night	68% 6% 8% 14% 4	5675
	21st to end	Night	63% 6% 7% 15% 8%	8360

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	7% 2 21% 33% 33% 5%	58
	21st to end	Day	9% 3 18% 35% 25% 9%	88
February	1st to 10th	Day	6% 7% 16% 29% 26% 15%	112
	11th to 20th	Day	8% 2 17% 32% 29% 12%	227
	21st to end	Day	11% 3 19% 27% 29% 11%	280
March	1st to 10th	Day	5% 2 20% 29% 27% 15%	340
	11th to 20th	Day	11% 3 21% 28% 25% 12%	346
	21st to end	Day	7% 6% 17% 27% 28% 15%	462
April	1st to 10th	Day	9% 3 16% 31% 26% 15%	529
	11th to 20th	Day	14% 2 14% 28% 30% 12%	590
	21st to end	Day	7% 2 17% 26% 32% 15%	608
May	1st to 10th	Day	16% 5% 16% 25% 27% 11%	783
	11th to 20th	Day	10% 4 15% 26% 32% 12%	881
	21st to end	Day	14% 2 13% 30% 32% 9%	1143
June	1st to 10th	Day	12% 6% 17% 30% 27% 9%	1170
	11th to 20th	Day	14% 4 18% 31% 25% 8%	1170
	21st to end	Day	12% 2 15% 31% 29% 11%	1170
July	1st to 10th	Day	14% 3 14% 28% 30% 12%	1146
	11th to 20th	Day	16% 3 13% 25% 31% 11%	1053
	21st to end	Day	18% 3 12% 29% 30% 9%	1039
August	1st to 10th	Day	21% 4 15% 25% 26% 10%	800
	11th to 20th	Day	28% 5% 15% 20% 20% 11%	615
	21st to end	Day	23% 3 14% 21% 27% 12%	693
September	1st to 10th	Day	29% 4 15% 18% 23% 12%	559
	11th to 20th	Day	24% 5% 18% 23% 21% 9%	450
	21st to end	Day	33% 3 17% 22% 18% 7%	416
October	1st to 10th	Day	19% 4 21% 25% 26% 5%	360
	11th to 20th	Day	22% 4 15% 24% 25% 10%	327
	21st to end	Day	18% 5% 15% 28% 26% 9%	198
November	1st to 10th	Day	9% 5% 23% 31% 24% 9%	174
	11th to 20th	Day	11% 3 19% 31% 22% 13%	90
	21st to end	Day	21% 12% 29% 32% 6%	34
January	1st to 10th	Night	12% 3 15% 31% 27% 12%	1216
	11th to 20th	Night	9% 2 20% 34% 27% 8%	1100
	21st to end	Night	9% 4 16% 34% 28% 9%	1113
February	1st to 10th	Night	8% 2 15% 33% 31% 11%	854
	11th to 20th	Night	6% 3 16% 32% 30% 13%	784
	21st to end	Night	7% 3 19% 34% 27% 11%	658
March	1st to 10th	Night	7% 2 14% 37% 29% 10%	762
	11th to 20th	Night	6% 2 15% 31% 35% 11%	696
	21st to end	Night	8% 1 10% 31% 37% 12%	594
April	1st to 10th	Night	13% 2 9% 27% 34% 15%	540
	11th to 20th	Night	9% 3 14% 34% 31% 8%	468
	21st to end	Night	5% 2 18% 37% 28% 10%	360
May	1st to 10th	Night	17% 4 12% 31% 27% 8%	241
	11th to 20th	Night	7% 3 16% 30% 36% 8%	177
	21st to end	Night	11% 3 9% 29% 49%	35
July	11th to 20th	Night	5% 30% 30% 30% 5%	20
	21st to end	Night	20% 2 10% 39% 27% 3	197
August	1st to 10th	Night	23% 2 15% 36% 21% 3	179
	11th to 20th	Night	26% 5% 11% 28% 27% 4	356
	21st to end	Night	22% 2 11% 25% 31% 9%	514
September	1st to 10th	Night	21% 3 13% 28% 27% 8%	540
	11th to 20th	Night	29% 3 15% 26% 24% 4	540
	21st to end	Night	35% 4 14% 22% 19% 5%	719
October	1st to 10th	Night	22% 4 20% 27% 22% 6%	720
	11th to 20th	Night	24% 2 13% 25% 26% 10%	787
	21st to end	Night	23% 4 13% 23% 26% 10%	891
November	1st to 10th	Night	15% 3 18% 30% 26% 8%	1001
	11th to 20th	Night	10% 3 18% 30% 25% 13%	1040
	21st to end	Night	12% 4 13% 28% 31% 13%	1127
December	1st to 10th	Night	10% 2 19% 33% 25% 9%	1220
	11th to 20th	Night	11% 3 15% 35% 28% 8%	1220
	21st to end	Night	9% 3 16% 32% 30% 9%	1342

Page generated at 2024-01-13 07:37:52. Version ac07

Copyright 2024 Attilla Danko