Goose Bay
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goose Bay clear sky chart from 2005-11-06 to 2026-01-02.

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	19% 13% 4 8% 5% 4 4 4 5% 6% 28%	127691
	Night	17% 14% 4 10% 5% 4 4 3 5% 6% 28%	123910
Transparency	Day	57% 5% 12% 18% 7%	131028
	Night	58% 5% 12% 17% 7% 1	128676
Seeing	Day	27% 14% 27% 20% 10% 2	18505
	Night	25% 12% 28% 25% 9% 1	25536

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	17% 17% 4 10% 5% 5% 4 3 4 5% 26%	2764
	11th to 20th	Day	13% 22% 7% 15% 3 3 2 3 4 5% 23%	3134
	21st to end	Day	4 7% 2 7% 5% 6% 9% 6% 9% 8% 36%	3724
February	1st to 10th	Day	9% 13% 4 9% 6% 5% 4 4 5% 7% 34%	1600
	11th to 20th	Day	10% 18% 6% 10% 6% 4 4 4 5% 7% 27%	1743
	21st to end	Day	8% 14% 5% 9% 7% 6% 5% 4 5% 7% 29%	1537
March	1st to 10th	Day	12% 15% 4 10% 5% 4 5% 4 3 3 33%	4474
	11th to 20th	Day	11% 27% 8% 11% 5% 4 3 2 3 3 23%	4832
	21st to end	Day	17% 17% 4 11% 5% 5% 4 3 4 5% 25%	5851
April	1st to 10th	Day	21% 20% 7% 12% 5% 4 3 3 3 4 19%	2400
	11th to 20th	Day	16% 17% 4 9% 5% 4 4 4 4 6% 26%	2515
	21st to end	Day	21% 16% 5% 10% 5% 4 4 3 4 4 24%	2800
May	1st to 10th	Day	29% 17% 4 7% 4 4 3 2 3 5% 23%	6345
	11th to 20th	Day	26% 12% 3 7% 4 4 3 3 5% 5% 28%	6378
	21st to end	Day	28% 15% 3 7% 4 3 3 3 4 4 26%	7904
June	1st to 10th	Day	27% 12% 4 8% 5% 4 4 4 4 5% 24%	3200
	11th to 20th	Day	28% 9% 3 7% 5% 5% 5% 4 5% 6% 25%	3200
	21st to end	Day	24% 10% 3 8% 5% 5% 4 4 5% 6% 25%	3200
July	1st to 10th	Day	19% 6% 2 7% 4 4 5% 4 5% 6% 38%	7260
	11th to 20th	Day	21% 8% 3 7% 5% 6% 5% 4 6% 7% 29%	7089
	21st to end	Day	16% 6% 3 8% 6% 6% 6% 6% 8% 9% 27%	7229
August	1st to 10th	Day	15% 7% 3 7% 6% 5% 7% 5% 8% 9% 29%	4564
	11th to 20th	Day	19% 7% 3 8% 6% 6% 6% 4 6% 7% 28%	4500
	21st to end	Day	15% 5% 2 6% 4 4 5% 4 5% 7% 42%	4570
September	1st to 10th	Day	19% 8% 3 7% 5% 5% 4 4 6% 7% 33%	2400
	11th to 20th	Day	21% 10% 2 7% 5% 5% 5% 4 6% 6% 29%	2398
	21st to end	Day	20% 9% 3 9% 6% 5% 5% 4 5% 6% 28%	2128
October	1st to 10th	Day	22% 12% 4 7% 5% 4 5% 4 6% 6% 28%	2000
	11th to 20th	Day	27% 13% 3 9% 5% 5% 4 3 4 5% 22%	1900
	21st to end	Day	20% 14% 3 8% 5% 3 5% 4 4 5% 26%	1940
November	1st to 10th	Day	20% 15% 5% 8% 5% 4 4 3 5% 5% 26%	1645
	11th to 20th	Day	20% 15% 3 8% 4 4 4 4 4 5% 29%	1570
	21st to end	Day	20% 16% 6% 9% 5% 4 3 3 4 5% 25%	1470
December	1st to 10th	Day	8% 17% 5% 9% 5% 4 4 3 4 6% 35%	2059
	11th to 20th	Day	16% 16% 6% 12% 5% 4 3 3 4 5% 24%	2310
	21st to end	Day	13% 15% 7% 12% 5% 4 3 3 5% 6% 28%	3058
January	1st to 10th	Night	18% 19% 5% 10% 6% 5% 4 3 3 4 24%	7221
	11th to 20th	Night	10% 23% 7% 16% 4 3 3 3 4 5% 22%	6771
	21st to end	Night	4 10% 3 8% 5% 5% 6% 5% 8% 7% 38%	7252
February	1st to 10th	Night	8% 10% 4 10% 6% 5% 5% 4 6% 7% 35%	2800
	11th to 20th	Night	11% 20% 5% 10% 6% 4 5% 3 5% 4 26%	2541
	21st to end	Night	8% 17% 5% 10% 6% 4 4 3 5% 5% 32%	2092
March	1st to 10th	Night	14% 15% 6% 13% 7% 5% 4 4 4 4 26%	5366
	11th to 20th	Night	14% 27% 7% 10% 4 3 3 2 3 4 22%	5123
	21st to end	Night	17% 17% 5% 9% 5% 4 4 4 4 6% 25%	5081
April	1st to 10th	Night	22% 20% 5% 12% 6% 4 3 2 3 3 20%	2000
	11th to 20th	Night	20% 14% 5% 7% 5% 4 4 4 4 6% 27%	1834
	21st to end	Night	21% 16% 5% 7% 5% 5% 4 3 4 5% 26%	1600
May	1st to 10th	Night	32% 13% 4 6% 4 3 3 2 4 4 26%	3615
	11th to 20th	Night	23% 14% 5% 7% 3 4 4 3 4 5% 28%	3536
	21st to end	Night	32% 13% 3 5% 3 3 3 3 4 4 26%	3021
June	1st to 10th	Night	27% 12% 3 7% 5% 4 4 4 4 4 27%	1200
	11th to 20th	Night	24% 8% 2 7% 6% 5% 5% 5% 6% 6% 25%	1200
	21st to end	Night	23% 9% 2 7% 5% 5% 4 3 5% 6% 30%	1200
July	1st to 10th	Night	19% 7% 3 6% 5% 4 5% 3 5% 6% 38%	2720
	11th to 20th	Night	20% 9% 3 8% 6% 4 5% 3 4 6% 31%	2888
	21st to end	Night	16% 7% 3 9% 6% 6% 6% 5% 7% 8% 27%	3599
August	1st to 10th	Night	13% 8% 3 8% 5% 5% 4 4 6% 8% 36%	2596
	11th to 20th	Night	19% 7% 3 9% 5% 5% 6% 5% 6% 8% 27%	2557
	21st to end	Night	17% 6% 2 6% 4 5% 5% 4 6% 8% 36%	3327
September	1st to 10th	Night	22% 7% 3 7% 5% 4 4 3 6% 7% 31%	2000
	11th to 20th	Night	25% 7% 2 6% 5% 4 4 4 5% 7% 31%	2002
	21st to end	Night	23% 8% 3 7% 5% 5% 4 3 4 6% 32%	2270
October	1st to 10th	Night	22% 10% 3 8% 5% 5% 4 5% 5% 6% 28%	2400
	11th to 20th	Night	26% 12% 3 8% 5% 4 4 4 5% 5% 25%	2499
	21st to end	Night	24% 12% 4 8% 4 4 4 3 4 6% 28%	2897
November	1st to 10th	Night	19% 14% 5% 10% 6% 5% 4 3 4 6% 23%	2873
	11th to 20th	Night	19% 17% 4 9% 4 4 3 3 4 5% 28%	3049
	21st to end	Night	19% 19% 5% 8% 5% 3 4 3 4 5% 25%	3150
December	1st to 10th	Night	9% 14% 6% 11% 6% 5% 5% 4 5% 5% 29%	5349
	11th to 20th	Night	17% 13% 4 14% 6% 5% 5% 4 5% 5% 22%	6119
	21st to end	Night	13% 15% 5% 11% 7% 4 4 3 4 6% 27%	8162

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	60% 5% 9% 15% 9% 3	2765
	11th to 20th	Day	66% 4 13% 12% 5%	3160
	21st to end	Day	38% 6% 17% 25% 13% 2	3724
February	1st to 10th	Day	50% 5% 13% 20% 11% 1	1600
	11th to 20th	Day	57% 5% 13% 18% 8%	1751
	21st to end	Day	54% 6% 9% 21% 9% 1	1537
March	1st to 10th	Day	56% 5% 6% 13% 20% 1	4478
	11th to 20th	Day	68% 4 5% 13% 9% 2	4832
	21st to end	Day	64% 4 6% 13% 12% 1	5851
April	1st to 10th	Day	70% 5% 7% 10% 6% 1	2400
	11th to 20th	Day	60% 6% 10% 17% 7%	2515
	21st to end	Day	64% 6% 10% 14% 5%	2800
May	1st to 10th	Day	67% 4 9% 13% 6% 1	6357
	11th to 20th	Day	57% 6% 13% 16% 8%	6382
	21st to end	Day	63% 3 11% 20% 3	7904
June	1st to 10th	Day	63% 7% 11% 15% 4	3200
	11th to 20th	Day	62% 6% 11% 15% 5%	3200
	21st to end	Day	59% 8% 11% 16% 5%	3200
July	1st to 10th	Day	45% 4 11% 30% 9%	7180
	11th to 20th	Day	54% 5% 11% 18% 12%	7002
	21st to end	Day	52% 5% 13% 26% 5%	7021
August	1st to 10th	Day	48% 7% 20% 22% 3	4550
	11th to 20th	Day	57% 6% 13% 18% 6%	4542
	21st to end	Day	42% 5% 13% 32% 8%	4570
September	1st to 10th	Day	51% 7% 16% 21% 5%	2400
	11th to 20th	Day	55% 8% 14% 18% 5%	2398
	21st to end	Day	58% 8% 14% 16% 5%	2128
October	1st to 10th	Day	51% 4 16% 23% 5%	3260
	11th to 20th	Day	68% 6% 11% 11% 4	3082
	21st to end	Day	60% 5% 12% 14% 7% 1	3127
November	1st to 10th	Day	62% 6% 13% 14% 4	1645
	11th to 20th	Day	59% 7% 13% 17% 2 1	1570
	21st to end	Day	64% 6% 10% 16% 4	1470
December	1st to 10th	Day	54% 4 18% 18% 5%	2059
	11th to 20th	Day	59% 9% 14% 11% 6%	2310
	21st to end	Day	58% 8% 14% 16% 5%	3058
January	1st to 10th	Night	62% 4 7% 17% 8% 1	7221
	11th to 20th	Night	64% 5% 16% 10% 4	6820
	21st to end	Night	39% 5% 15% 27% 13% 2	7252
February	1st to 10th	Night	48% 5% 13% 23% 10% 2	2800
	11th to 20th	Night	61% 5% 10% 15% 8%	2544
	21st to end	Night	54% 5% 9% 22% 9% 1	2092
March	1st to 10th	Night	62% 3 7% 12% 15% 1	5375
	11th to 20th	Night	68% 3 6% 11% 11% 1	5124
	21st to end	Night	62% 5% 7% 15% 9% 2	5081
April	1st to 10th	Night	71% 4 5% 12% 7% 1	2000
	11th to 20th	Night	58% 6% 10% 16% 10%	1834
	21st to end	Night	61% 7% 9% 15% 7% 1	1600
May	1st to 10th	Night	64% 4 9% 11% 11%	3620
	11th to 20th	Night	58% 6% 15% 15% 5%	3537
	21st to end	Night	63% 4 13% 16% 3	3022
June	1st to 10th	Night	60% 6% 12% 15% 6% 1	1200
	11th to 20th	Night	57% 9% 12% 17% 4	1200
	21st to end	Night	55% 7% 14% 16% 9%	1200
July	1st to 10th	Night	47% 5% 14% 21% 13%	2690
	11th to 20th	Night	54% 4 13% 20% 8%	2852
	21st to end	Night	53% 5% 14% 25% 2	3493
August	1st to 10th	Night	46% 7% 21% 22% 5%	2585
	11th to 20th	Night	56% 6% 16% 18% 4	2581
	21st to end	Night	45% 5% 15% 30% 5%	3326
September	1st to 10th	Night	51% 6% 17% 21% 5%	2000
	11th to 20th	Night	53% 8% 16% 17% 5%	2002
	21st to end	Night	55% 7% 13% 19% 6%	2270
October	1st to 10th	Night	48% 5% 13% 25% 8%	3920
	11th to 20th	Night	64% 5% 11% 14% 6%	4061
	21st to end	Night	58% 5% 10% 20% 6%	4671
November	1st to 10th	Night	64% 7% 12% 12% 5%	2873
	11th to 20th	Night	60% 6% 13% 17% 4 1	3049
	21st to end	Night	63% 6% 10% 16% 4	3150
December	1st to 10th	Night	55% 5% 15% 19% 6%	5349
	11th to 20th	Night	63% 6% 13% 12% 6% 1	6120
	21st to end	Night	58% 7% 14% 17% 4	8162

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	16% 11% 37% 24% 10% 2	202
	11th to 20th	Day	25% 14% 28% 21% 11% 3	200
	21st to end	Day	16% 15% 35% 26% 7%	325
February	1st to 10th	Day	16% 13% 31% 28% 10% 3	400
	11th to 20th	Day	17% 16% 32% 23% 11% 1	396
	21st to end	Day	14% 18% 34% 21% 9% 4	331
March	1st to 10th	Day	19% 16% 27% 25% 11% 3	400
	11th to 20th	Day	21% 16% 26% 22% 12% 3	466
	21st to end	Day	24% 18% 32% 17% 6% 3	550
April	1st to 10th	Day	29% 18% 28% 16% 8% 2	500
	11th to 20th	Day	23% 14% 32% 19% 8% 4	545
	21st to end	Day	30% 15% 23% 18% 11% 3	700
May	1st to 10th	Day	34% 14% 22% 18% 9% 2	703
	11th to 20th	Day	36% 13% 20% 17% 12% 3	724
	21st to end	Day	34% 12% 26% 18% 7% 2	790
June	1st to 10th	Day	32% 11% 25% 21% 9% 2	730
	11th to 20th	Day	36% 12% 21% 20% 9% 2	730
	21st to end	Day	30% 13% 25% 19% 10% 2	730
July	1st to 10th	Day	26% 9% 25% 23% 14% 3	720
	11th to 20th	Day	25% 10% 27% 29% 8% 1	718
	21st to end	Day	25% 9% 23% 26% 15% 2	795
August	1st to 10th	Day	24% 8% 25% 24% 16% 3	725
	11th to 20th	Day	25% 8% 27% 23% 14% 2	717
	21st to end	Day	28% 8% 27% 21% 12% 3	635
September	1st to 10th	Day	25% 17% 33% 17% 7% 1	530
	11th to 20th	Day	27% 17% 30% 17% 8% 1	528
	21st to end	Day	27% 18% 32% 15% 6% 2	420
October	1st to 10th	Day	25% 23% 30% 15% 5% 2	420
	11th to 20th	Day	35% 14% 23% 17% 8% 3	420
	21st to end	Day	28% 17% 26% 18% 8% 2	462
November	1st to 10th	Day	28% 20% 30% 18% 4 1	425
	11th to 20th	Day	32% 13% 30% 19% 6% 1	430
	21st to end	Day	33% 12% 28% 21% 5%	430
December	1st to 10th	Day	22% 15% 33% 19% 9% 2	246
	11th to 20th	Day	26% 20% 33% 19% 2 1	220
	21st to end	Day	21% 16% 29% 21% 10% 2	242
January	1st to 10th	Night	26% 9% 31% 25% 9% 1	906
	11th to 20th	Night	19% 14% 33% 25% 8% 1	900
	21st to end	Night	16% 13% 33% 29% 8%	990
February	1st to 10th	Night	14% 10% 34% 29% 12% 2	900
	11th to 20th	Night	22% 12% 31% 25% 8% 2	786
	21st to end	Night	17% 11% 31% 26% 12% 3	660
March	1st to 10th	Night	18% 15% 28% 25% 11% 2	800
	11th to 20th	Night	22% 13% 28% 27% 9% 1	800
	21st to end	Night	29% 12% 28% 23% 7% 1	715
April	1st to 10th	Night	31% 14% 24% 25% 6%	600
	11th to 20th	Night	24% 12% 26% 24% 10% 2	594
	21st to end	Night	29% 12% 24% 25% 10% 1	600
May	1st to 10th	Night	30% 8% 24% 29% 8% 1	600
	11th to 20th	Night	32% 12% 22% 21% 11% 1	592
	21st to end	Night	36% 10% 21% 21% 10% 1	462
June	1st to 10th	Night	32% 8% 20% 31% 9%	400
	11th to 20th	Night	27% 9% 26% 30% 7%	400
	21st to end	Night	24% 8% 26% 27% 15%	400
July	1st to 10th	Night	24% 6% 21% 32% 16% 1	390
	11th to 20th	Night	19% 9% 29% 34% 10%	388
	21st to end	Night	22% 6% 20% 39% 13%	502
August	1st to 10th	Night	20% 7% 27% 31% 15% 1	598
	11th to 20th	Night	23% 8% 25% 31% 12% 1	592
	21st to end	Night	23% 8% 25% 30% 14%	660
September	1st to 10th	Night	28% 12% 27% 28% 5%	600
	11th to 20th	Night	30% 10% 29% 25% 6%	600
	21st to end	Night	28% 12% 30% 22% 7%	670
October	1st to 10th	Night	28% 15% 29% 22% 7%	800
	11th to 20th	Night	31% 11% 26% 23% 8%	855
	21st to end	Night	31% 13% 25% 22% 9%	1001
November	1st to 10th	Night	29% 16% 30% 20% 5% 1	930
	11th to 20th	Night	29% 13% 30% 23% 4 1	950
	21st to end	Night	31% 12% 33% 18% 5%	950
December	1st to 10th	Night	21% 16% 31% 22% 10% 1	950
	11th to 20th	Night	24% 16% 31% 22% 6% 1	950
	21st to end	Night	23% 12% 28% 24% 12% 1	1045

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