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 2024-12-09.

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% 12% 5% 11% 6% 5% 5% 4 6% 7% 26%	110404
	Night	7% 13% 6% 13% 8% 7% 7% 5% 7% 7% 20%	102512
Transparency	Day	57% 7% 15% 17% 4	109980
	Night	61% 6% 11% 15% 6%	102562
Seeing	Day	15% 4 15% 27% 27% 11%	19318
	Night	13% 3 16% 31% 28% 9%	23049

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	4 11% 6% 19% 11% 12% 10% 8% 4 6% 10%	403
	21st to end	Day	6% 16% 6% 12% 8% 7% 9% 7% 12% 7% 11%	1181
February	1st to 10th	Day	3 12% 5% 11% 9% 8% 10% 6% 10% 6% 20%	985
	11th to 20th	Day	5% 11% 5% 12% 11% 11% 9% 6% 8% 8% 15%	1186
	21st to end	Day	3 11% 6% 10% 11% 8% 9% 9% 10% 7% 18%	1256
March	1st to 10th	Day	2 6% 5% 18% 13% 11% 10% 6% 7% 7% 15%	2892
	11th to 20th	Day	3 13% 8% 20% 10% 6% 5% 5% 8% 5% 18%	3242
	21st to end	Day	5% 16% 5% 14% 9% 6% 6% 5% 7% 6% 21%	4165
April	1st to 10th	Day	6% 16% 5% 13% 9% 7% 7% 5% 5% 6% 20%	2539
	11th to 20th	Day	8% 16% 5% 11% 7% 5% 5% 4 6% 6% 27%	2706
	21st to end	Day	4 10% 4 12% 10% 8% 7% 4 7% 7% 27%	3049
May	1st to 10th	Day	13% 24% 9% 14% 7% 5% 4 3 4 4 14%	5594
	11th to 20th	Day	7% 14% 6% 14% 6% 5% 5% 4 5% 6% 26%	6063
	21st to end	Day	12% 12% 8% 16% 4 3 3 3 5% 6% 28%	7685
June	1st to 10th	Day	9% 8% 4 7% 5% 4 5% 4 6% 8% 39%	4560
	11th to 20th	Day	11% 8% 3 7% 5% 5% 4 4 8% 10% 35%	4560
	21st to end	Day	10% 7% 2 6% 5% 5% 5% 5% 7% 9% 39%	4560
July	1st to 10th	Day	20% 8% 3 7% 5% 5% 5% 4 7% 8% 28%	7600
	11th to 20th	Day	12% 8% 3 8% 5% 5% 5% 5% 7% 7% 35%	7217
	21st to end	Day	16% 9% 3 7% 5% 4 4 4 6% 7% 33%	6710
August	1st to 10th	Day	14% 8% 3 7% 4 5% 5% 4 5% 7% 39%	5655
	11th to 20th	Day	19% 13% 4 9% 5% 5% 5% 4 5% 6% 25%	4958
	21st to end	Day	17% 13% 4 10% 6% 6% 6% 4 5% 6% 22%	5104
September	1st to 10th	Day	20% 13% 4 9% 5% 5% 5% 4 5% 7% 24%	2575
	11th to 20th	Day	18% 16% 5% 10% 5% 4 4 3 4 5% 26%	2280
	21st to end	Day	26% 22% 6% 12% 5% 4 4 3 3 3 12%	2019
October	1st to 10th	Day	12% 18% 6% 12% 5% 4 4 3 5% 7% 23%	2988
	11th to 20th	Day	8% 23% 10% 18% 7% 5% 6% 4 4 4 10%	2536
	21st to end	Day	8% 17% 7% 14% 9% 7% 8% 4 6% 5% 15%	2271
November	1st to 10th	Day	8% 19% 8% 17% 8% 7% 5% 5% 3 4 15%	965
	11th to 20th	Day	6% 14% 7% 20% 14% 8% 7% 4 4 4 11%	655
	21st to end	Day	10% 15% 5% 18% 6% 9% 8% 4 7% 6% 12%	245
January	1st to 10th	Night	4 10% 3 9% 6% 6% 8% 7% 7% 9% 32%	7567
	11th to 20th	Night	3 9% 4 13% 8% 7% 7% 6% 7% 8% 28%	6506
	21st to end	Night	6% 11% 5% 11% 8% 8% 10% 9% 9% 10% 13%	6480
February	1st to 10th	Night	3 11% 4 13% 8% 9% 8% 7% 10% 8% 18%	3212
	11th to 20th	Night	2 11% 5% 14% 9% 8% 8% 6% 7% 8% 19%	2880
	21st to end	Night	3 9% 5% 14% 11% 9% 5% 5% 8% 7% 23%	2198
March	1st to 10th	Night	2 6% 4 15% 14% 11% 9% 5% 8% 7% 19%	3972
	11th to 20th	Night	2 11% 8% 19% 11% 8% 6% 5% 7% 5% 18%	3724
	21st to end	Night	3 10% 6% 15% 8% 7% 5% 5% 7% 7% 28%	3477
April	1st to 10th	Night	7% 11% 5% 12% 6% 8% 7% 7% 7% 7% 24%	1638
	11th to 20th	Night	5% 16% 5% 10% 7% 4 4 3 5% 7% 32%	1421
	21st to end	Night	3 8% 3 9% 10% 8% 6% 5% 6% 9% 34%	1132
May	1st to 10th	Night	12% 23% 9% 15% 8% 5% 3 2 3 4 17%	1363
	11th to 20th	Night	7% 13% 6% 16% 6% 5% 4 4 4 6% 28%	835
	21st to end	Night	13% 10% 10% 9% 4 1 1 1 4 5% 42%	184
July	11th to 20th	Night	4 3 3 5% 4 4 9% 68%	74
	21st to end	Night	17% 10% 3 8% 3 6% 5% 6% 6% 7% 30%	848
August	1st to 10th	Night	15% 6% 2 7% 5% 5% 5% 3 5% 9% 36%	1274
	11th to 20th	Night	13% 10% 3 9% 5% 6% 6% 5% 8% 7% 29%	1869
	21st to end	Night	20% 11% 4 10% 5% 5% 4 3 6% 6% 26%	2557
September	1st to 10th	Night	15% 13% 3 9% 6% 6% 5% 4 7% 8% 24%	1604
	11th to 20th	Night	19% 16% 5% 8% 5% 4 4 3 5% 6% 23%	1900
	21st to end	Night	23% 26% 6% 11% 5% 5% 3 2 4 3 14%	2160
October	1st to 10th	Night	11% 18% 6% 10% 5% 4 4 3 5% 5% 29%	3983
	11th to 20th	Night	10% 21% 9% 19% 9% 6% 6% 3 5% 4 9%	4387
	21st to end	Night	8% 14% 6% 15% 9% 7% 6% 5% 6% 6% 18%	5260
November	1st to 10th	Night	7% 20% 8% 16% 8% 8% 5% 3 5% 5% 14%	3317
	11th to 20th	Night	5% 14% 7% 21% 12% 9% 7% 4 5% 4 12%	3745
	21st to end	Night	6% 16% 7% 17% 11% 8% 7% 4 5% 5% 14%	4153
December	1st to 10th	Night	5% 14% 6% 13% 9% 8% 7% 6% 7% 7% 19%	4757
	11th to 20th	Night	5% 14% 7% 13% 10% 10% 9% 6% 8% 6% 13%	5675
	21st to end	Night	4 16% 6% 13% 9% 8% 8% 7% 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	76% 3 7% 7% 4 2	409
	21st to end	Day	62% 6% 11% 11% 10%	1181
February	1st to 10th	Day	57% 6% 10% 18% 8%	985
	11th to 20th	Day	63% 7% 10% 15% 5%	1192
	21st to end	Day	57% 7% 14% 14% 6% 1	1256
March	1st to 10th	Day	64% 7% 9% 14% 5%	2892
	11th to 20th	Day	65% 6% 11% 16% 2	3242
	21st to end	Day	62% 6% 13% 15% 3 1	4165
April	1st to 10th	Day	64% 7% 12% 12% 6%	2539
	11th to 20th	Day	57% 6% 14% 17% 5%	2706
	21st to end	Day	54% 7% 14% 19% 5%	3049
May	1st to 10th	Day	75% 6% 9% 9% 2	5594
	11th to 20th	Day	56% 8% 16% 17% 2	6067
	21st to end	Day	57% 6% 14% 17% 6%	7686
June	1st to 10th	Day	41% 9% 14% 29% 7%	4560
	11th to 20th	Day	43% 9% 18% 26% 4	4560
	21st to end	Day	39% 11% 18% 26% 6%	4560
July	1st to 10th	Day	54% 8% 18% 18% 3	7481
	11th to 20th	Day	47% 8% 13% 27% 5%	7082
	21st to end	Day	48% 8% 19% 23% 2	6497
August	1st to 10th	Day	44% 7% 19% 19% 10% 2	5634
	11th to 20th	Day	60% 8% 15% 16% 1	5006
	21st to end	Day	61% 9% 20% 9%	5103
September	1st to 10th	Day	59% 10% 20% 9% 1	2575
	11th to 20th	Day	61% 8% 19% 12% 1	2280
	21st to end	Day	79% 6% 9% 6%	2019
October	1st to 10th	Day	61% 7% 14% 17%	2988
	11th to 20th	Day	76% 6% 9% 8% 1	2536
	21st to end	Day	70% 7% 11% 11% 1	2271
November	1st to 10th	Day	72% 7% 10% 9% 2	965
	11th to 20th	Day	75% 9% 8% 7% 1	655
	21st to end	Day	69% 8% 8% 11% 4	245
January	1st to 10th	Night	47% 4 8% 19% 21%	7567
	11th to 20th	Night	52% 4 8% 15% 14% 5%	6562
	21st to end	Night	59% 6% 10% 13% 10%	6480
February	1st to 10th	Night	57% 7% 12% 17% 7%	3212
	11th to 20th	Night	58% 7% 12% 17% 6%	2884
	21st to end	Night	57% 5% 12% 17% 7% 1	2198
March	1st to 10th	Night	61% 6% 8% 18% 7%	3972
	11th to 20th	Night	65% 4 11% 16% 4	3726
	21st to end	Night	53% 7% 18% 17% 3 1	3477
April	1st to 10th	Night	55% 8% 14% 15% 8%	1638
	11th to 20th	Night	52% 4 15% 21% 7%	1421
	21st to end	Night	47% 6% 18% 22% 7%	1132
May	1st to 10th	Night	74% 5% 9% 10% 3	1363
	11th to 20th	Night	58% 7% 14% 19% 3	835
	21st to end	Night	48% 1 9% 26% 15% 1	184
July	11th to 20th	Night	23% 1 20% 49% 7%	74
	21st to end	Night	51% 9% 17% 21% 2	822
August	1st to 10th	Night	45% 6% 20% 20% 7% 1	1270
	11th to 20th	Night	51% 9% 23% 15% 2	1887
	21st to end	Night	58% 8% 22% 12%	2557
September	1st to 10th	Night	57% 10% 22% 10% 1	1604
	11th to 20th	Night	61% 8% 19% 11% 1	1900
	21st to end	Night	77% 5% 10% 7% 1	2160
October	1st to 10th	Night	57% 6% 14% 22% 1	3983
	11th to 20th	Night	78% 6% 10% 5%	4387
	21st to end	Night	64% 7% 14% 13% 2	5260
November	1st to 10th	Night	72% 7% 11% 9% 1	3317
	11th to 20th	Night	76% 6% 8% 8% 2	3745
	21st to end	Night	71% 6% 8% 11% 3	4153
December	1st to 10th	Night	63% 7% 10% 16% 4	4757
	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	8% 3 17% 35% 32% 5%	63
	21st to end	Day	8% 5% 20% 33% 24% 9%	99
February	1st to 10th	Day	7% 7% 17% 29% 25% 15%	126
	11th to 20th	Day	8% 3 19% 31% 28% 11%	250
	21st to end	Day	10% 3 18% 26% 30% 12%	307
March	1st to 10th	Day	5% 2 20% 32% 27% 14%	370
	11th to 20th	Day	10% 3 21% 28% 25% 11%	377
	21st to end	Day	8% 7% 17% 27% 28% 14%	506
April	1st to 10th	Day	9% 3 16% 30% 26% 15%	576
	11th to 20th	Day	13% 2 14% 29% 30% 12%	640
	21st to end	Day	7% 2 17% 27% 32% 15%	659
May	1st to 10th	Day	16% 5% 16% 26% 26% 11%	843
	11th to 20th	Day	10% 4 15% 26% 33% 12%	946
	21st to end	Day	14% 2 12% 30% 32% 9%	1225
June	1st to 10th	Day	11% 6% 18% 31% 26% 9%	1250
	11th to 20th	Day	13% 4 18% 31% 25% 8%	1250
	21st to end	Day	12% 2 14% 31% 30% 11%	1250
July	1st to 10th	Day	15% 4 14% 27% 28% 11%	1226
	11th to 20th	Day	16% 3 13% 25% 31% 12%	1128
	21st to end	Day	18% 3 12% 28% 29% 10%	1113
August	1st to 10th	Day	20% 4 14% 25% 27% 11%	859
	11th to 20th	Day	28% 6% 16% 21% 20% 10%	665
	21st to end	Day	23% 4 14% 21% 27% 12%	748
September	1st to 10th	Day	28% 4 14% 18% 23% 13%	605
	11th to 20th	Day	23% 5% 17% 23% 21% 10%	490
	21st to end	Day	36% 3 16% 21% 17% 7%	452
October	1st to 10th	Day	18% 4 20% 25% 26% 7%	390
	11th to 20th	Day	22% 4 15% 25% 25% 10%	355
	21st to end	Day	17% 4 14% 31% 25% 8%	220
November	1st to 10th	Day	9% 5% 22% 30% 23% 11%	193
	11th to 20th	Day	10% 4 17% 31% 24% 14%	100
	21st to end	Day	19% 14% 32% 30% 5%	37
January	1st to 10th	Night	12% 3 15% 31% 27% 12%	1216
	11th to 20th	Night	9% 2 20% 34% 27% 7%	1130
	21st to end	Night	9% 4 16% 34% 27% 9%	1184
February	1st to 10th	Night	8% 3 15% 33% 31% 10%	907
	11th to 20th	Night	6% 3 18% 32% 29% 12%	834
	21st to end	Night	7% 3 18% 34% 27% 11%	703
March	1st to 10th	Night	7% 2 14% 37% 30% 10%	807
	11th to 20th	Night	6% 2 15% 33% 34% 11%	734
	21st to end	Night	8% 1 11% 32% 36% 12%	627
April	1st to 10th	Night	13% 2 10% 26% 35% 14%	570
	11th to 20th	Night	9% 3 14% 36% 30% 8%	494
	21st to end	Night	4 2 18% 37% 29% 9%	380
May	1st to 10th	Night	17% 4 13% 30% 28% 8%	254
	11th to 20th	Night	7% 3 16% 30% 35% 9%	187
	21st to end	Night	11% 3 8% 27% 51%	37
July	11th to 20th	Night	5% 27% 32% 32% 5%	22
	21st to end	Night	20% 2 10% 38% 26% 4	208
August	1st to 10th	Night	22% 2 15% 35% 22% 3	189
	11th to 20th	Night	25% 5% 12% 28% 27% 4	376
	21st to end	Night	22% 3 12% 24% 31% 8%	543
September	1st to 10th	Night	20% 3 13% 29% 27% 8%	570
	11th to 20th	Night	29% 2 15% 25% 25% 4	570
	21st to end	Night	36% 4 15% 21% 19% 5%	759
October	1st to 10th	Night	21% 4 19% 27% 23% 6%	760
	11th to 20th	Night	23% 2 14% 26% 26% 9%	835
	21st to end	Night	22% 4 14% 25% 26% 10%	946
November	1st to 10th	Night	15% 3 18% 29% 26% 9%	1061
	11th to 20th	Night	10% 4 17% 30% 26% 14%	1100
	21st to end	Night	12% 4 13% 29% 30% 12%	1197
December	1st to 10th	Night	10% 2 19% 33% 26% 9%	1287
	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 2024-12-06 01:54:47. Version ac07

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