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 2024-11-12.

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% 27%	102158
	Night	17% 14% 4 9% 5% 4 4 3 5% 5% 28%	97168
Transparency	Day	58% 6% 12% 17% 6%	105520
	Night	58% 6% 11% 17% 7% 1	101911
Seeing	Day	27% 13% 27% 21% 10% 2	17025
	Night	25% 12% 28% 25% 9% 1	23958

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	7% 11% 4 11% 5% 6% 6% 4 5% 6% 37%	1925
	11th to 20th	Day	16% 23% 5% 10% 3 3 3 3 4 5% 25%	2210
	21st to end	Day	6% 10% 3 8% 5% 5% 6% 5% 9% 7% 37%	2595
February	1st to 10th	Day	9% 13% 4 9% 6% 5% 4 4 5% 7% 34%	1520
	11th to 20th	Day	10% 18% 6% 9% 6% 4 4 4 5% 6% 27%	1653
	21st to end	Day	9% 14% 5% 9% 7% 6% 5% 4 6% 7% 28%	1462
March	1st to 10th	Day	8% 14% 4 10% 6% 5% 7% 5% 4 3 33%	3114
	11th to 20th	Day	10% 34% 10% 13% 5% 4 3 2 3 3 14%	3374
	21st to end	Day	19% 21% 4 11% 5% 4 4 2 4 4 22%	4089
April	1st to 10th	Day	21% 21% 7% 11% 5% 4 3 3 3 4 19%	2280
	11th to 20th	Day	16% 17% 4 9% 5% 4 4 4 4 6% 26%	2387
	21st to end	Day	21% 16% 5% 10% 5% 4 4 3 4 4 24%	2660
May	1st to 10th	Day	33% 19% 4 7% 4 4 3 2 3 5% 16%	4425
	11th to 20th	Day	22% 12% 3 7% 4 4 4 4 6% 6% 28%	4445
	21st to end	Day	37% 18% 4 7% 3 3 3 2 3 3 17%	5509
June	1st to 10th	Day	27% 12% 3 8% 5% 4 4 4 4 5% 24%	3040
	11th to 20th	Day	28% 10% 3 7% 5% 5% 5% 3 5% 5% 25%	3040
	21st to end	Day	24% 10% 3 8% 6% 5% 4 4 5% 6% 25%	3040
July	1st to 10th	Day	20% 7% 3 7% 5% 4 5% 4 5% 6% 36%	5070
	11th to 20th	Day	23% 9% 3 8% 5% 5% 5% 4 5% 5% 28%	4951
	21st to end	Day	15% 7% 2 8% 6% 6% 6% 5% 8% 8% 27%	5019
August	1st to 10th	Day	16% 7% 3 7% 6% 5% 7% 5% 8% 8% 28%	4424
	11th to 20th	Day	19% 8% 3 8% 6% 6% 6% 5% 6% 7% 28%	4360
	21st to end	Day	15% 5% 2 6% 4 5% 5% 4 5% 7% 43%	4430
September	1st to 10th	Day	19% 8% 3 7% 5% 5% 4 3 6% 7% 33%	2280
	11th to 20th	Day	20% 10% 2 7% 5% 5% 5% 4 6% 6% 30%	2278
	21st to end	Day	20% 9% 3 9% 6% 5% 5% 4 6% 6% 28%	2022
October	1st to 10th	Day	22% 12% 4 7% 5% 4 5% 3 6% 6% 27%	1900
	11th to 20th	Day	27% 12% 3 9% 6% 4 5% 4 4 5% 22%	1805
	21st to end	Day	20% 15% 3 8% 5% 3 5% 4 4 5% 26%	1843
November	1st to 10th	Day	20% 15% 5% 9% 5% 4 4 3 5% 5% 26%	1565
	11th to 20th	Day	17% 15% 3 8% 5% 4 4 4 4 5% 31%	1429
	21st to end	Day	20% 15% 5% 9% 5% 4 3 3 4 5% 26%	1330
December	1st to 10th	Day	11% 18% 4 8% 6% 5% 5% 2 4 5% 31%	1164
	11th to 20th	Day	17% 17% 5% 8% 5% 3 3 3 4 5% 29%	1430
	21st to end	Day	12% 14% 5% 13% 7% 5% 5% 3 6% 5% 25%	2090
January	1st to 10th	Night	9% 12% 5% 11% 7% 5% 5% 3 4 6% 34%	5027
	11th to 20th	Night	11% 26% 6% 10% 4 4 4 3 4 5% 24%	4760
	21st to end	Night	6% 14% 4 9% 5% 4 4 4 6% 5% 39%	5070
February	1st to 10th	Night	9% 10% 5% 10% 6% 5% 5% 3 6% 7% 36%	2660
	11th to 20th	Night	12% 20% 5% 10% 6% 4 5% 3 5% 4 26%	2411
	21st to end	Night	8% 17% 5% 10% 6% 4 5% 3 5% 5% 30%	1991
March	1st to 10th	Night	9% 16% 5% 11% 8% 5% 5% 4 4 4 27%	3726
	11th to 20th	Night	14% 34% 8% 11% 5% 3 3 2 3 3 14%	3581
	21st to end	Night	20% 19% 5% 9% 6% 4 4 3 4 5% 21%	3543
April	1st to 10th	Night	23% 20% 5% 11% 6% 4 3 2 3 3 20%	1900
	11th to 20th	Night	20% 13% 5% 8% 5% 4 4 4 4 6% 27%	1742
	21st to end	Night	21% 15% 5% 6% 5% 5% 5% 3 4 5% 26%	1520
May	1st to 10th	Night	35% 14% 4 6% 4 3 3 3 4 4 20%	2525
	11th to 20th	Night	21% 13% 4 7% 4 5% 4 3 5% 5% 29%	2459
	21st to end	Night	39% 13% 3 5% 3 3 3 3 5% 4 19%	2105
June	1st to 10th	Night	26% 12% 3 6% 5% 4 4 4 4 4 27%	1140
	11th to 20th	Night	24% 8% 2 7% 6% 5% 5% 5% 6% 6% 25%	1140
	21st to end	Night	24% 9% 2 7% 6% 5% 4 3 5% 6% 30%	1140
July	1st to 10th	Night	18% 7% 3 7% 6% 4 5% 4 6% 6% 35%	1900
	11th to 20th	Night	24% 8% 3 8% 6% 4 4 3 4 6% 30%	2016
	21st to end	Night	16% 8% 3 9% 7% 6% 6% 4 6% 8% 28%	2513
August	1st to 10th	Night	13% 8% 3 9% 5% 5% 4 4 6% 8% 35%	2516
	11th to 20th	Night	20% 7% 3 9% 5% 6% 6% 5% 6% 8% 27%	2477
	21st to end	Night	17% 6% 2 5% 4 5% 5% 4 7% 8% 37%	3226
September	1st to 10th	Night	22% 7% 3 7% 5% 4 4 3 6% 7% 31%	1900
	11th to 20th	Night	25% 7% 3 6% 4 4 4 4 5% 7% 31%	1902
	21st to end	Night	23% 8% 3 7% 5% 5% 4 3 4 6% 31%	2156
October	1st to 10th	Night	22% 10% 3 8% 5% 5% 4 5% 5% 6% 27%	2280
	11th to 20th	Night	26% 12% 3 8% 5% 4 4 4 5% 5% 26%	2374
	21st to end	Night	24% 12% 4 7% 4 4 4 3 4 6% 28%	2752
November	1st to 10th	Night	19% 14% 5% 9% 6% 5% 4 3 5% 6% 24%	2733
	11th to 20th	Night	17% 16% 4 9% 4 4 3 3 5% 5% 30%	2773
	21st to end	Night	20% 18% 5% 8% 5% 3 3 3 4 5% 26%	2850
December	1st to 10th	Night	14% 16% 6% 10% 7% 5% 4 3 5% 5% 25%	3014
	11th to 20th	Night	19% 15% 4 10% 5% 4 4 3 5% 6% 25%	3769
	21st to end	Night	12% 15% 4 13% 8% 5% 5% 3 5% 5% 25%	5577

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	47% 7% 10% 19% 12% 4	1926
	11th to 20th	Day	63% 5% 8% 17% 8%	2210
	21st to end	Day	42% 8% 15% 16% 16% 3	2595
February	1st to 10th	Day	50% 5% 13% 21% 11% 1	1520
	11th to 20th	Day	57% 6% 12% 17% 8%	1661
	21st to end	Day	55% 6% 9% 20% 10% 1	1462
March	1st to 10th	Day	53% 6% 8% 16% 15% 1	3118
	11th to 20th	Day	78% 4 5% 8% 5%	3374
	21st to end	Day	67% 6% 7% 12% 8% 1	4089
April	1st to 10th	Day	70% 6% 7% 10% 6% 1	2280
	11th to 20th	Day	60% 7% 11% 17% 6%	2387
	21st to end	Day	64% 6% 10% 14% 5%	2660
May	1st to 10th	Day	73% 6% 9% 9% 3	4440
	11th to 20th	Day	52% 9% 15% 19% 5%	4449
	21st to end	Day	74% 4 6% 13% 3	5509
June	1st to 10th	Day	62% 7% 11% 15% 4	3040
	11th to 20th	Day	62% 6% 11% 15% 5%	3040
	21st to end	Day	59% 8% 11% 16% 5%	3040
July	1st to 10th	Day	48% 6% 11% 27% 9%	4990
	11th to 20th	Day	56% 7% 11% 15% 10%	4864
	21st to end	Day	51% 7% 15% 23% 4	4859
August	1st to 10th	Day	49% 7% 20% 21% 3	4410
	11th to 20th	Day	57% 6% 13% 18% 5%	4402
	21st to end	Day	42% 5% 13% 32% 8%	4430
September	1st to 10th	Day	52% 7% 16% 21% 5%	2280
	11th to 20th	Day	54% 8% 14% 18% 5%	2278
	21st to end	Day	58% 8% 13% 16% 5%	2022
October	1st to 10th	Day	51% 4 16% 24% 5%	3160
	11th to 20th	Day	68% 6% 11% 11% 4	2987
	21st to end	Day	61% 6% 11% 14% 8% 1	3030
November	1st to 10th	Day	62% 7% 12% 14% 5%	1565
	11th to 20th	Day	56% 8% 14% 19% 3	1429
	21st to end	Day	64% 7% 10% 16% 4	1330
December	1st to 10th	Day	58% 8% 12% 17% 6%	1164
	11th to 20th	Day	59% 7% 12% 15% 6% 1	1430
	21st to end	Day	58% 9% 11% 15% 6% 1	2090
January	1st to 10th	Night	51% 6% 8% 23% 11% 2	5027
	11th to 20th	Night	62% 7% 11% 14% 6%	4760
	21st to end	Night	43% 6% 11% 19% 18% 2	5070
February	1st to 10th	Night	48% 5% 13% 23% 10% 2	2660
	11th to 20th	Night	61% 5% 10% 15% 8%	2414
	21st to end	Night	55% 5% 8% 21% 10% 1	1991
March	1st to 10th	Night	59% 5% 9% 14% 13% 1	3735
	11th to 20th	Night	77% 5% 5% 8% 4 1	3582
	21st to end	Night	66% 8% 8% 10% 6% 2	3543
April	1st to 10th	Night	71% 5% 5% 12% 6% 1	1900
	11th to 20th	Night	58% 7% 10% 15% 9%	1742
	21st to end	Night	60% 8% 10% 15% 7% 1	1520
May	1st to 10th	Night	69% 6% 10% 12% 3	2530
	11th to 20th	Night	53% 9% 13% 19% 5%	2460
	21st to end	Night	69% 6% 8% 13% 4	2106
June	1st to 10th	Night	60% 6% 12% 15% 6% 1	1140
	11th to 20th	Night	58% 9% 12% 17% 4	1140
	21st to end	Night	56% 7% 14% 15% 9%	1140
July	1st to 10th	Night	49% 7% 13% 19% 12%	1870
	11th to 20th	Night	55% 6% 16% 17% 6%	1980
	21st to end	Night	53% 7% 13% 24% 2	2433
August	1st to 10th	Night	47% 7% 21% 21% 4	2505
	11th to 20th	Night	56% 6% 16% 18% 4	2501
	21st to end	Night	45% 6% 15% 30% 5%	3225
September	1st to 10th	Night	51% 7% 16% 20% 6%	1900
	11th to 20th	Night	53% 8% 16% 18% 5%	1902
	21st to end	Night	56% 7% 14% 18% 6%	2156
October	1st to 10th	Night	49% 5% 13% 25% 8%	3800
	11th to 20th	Night	64% 5% 10% 14% 6%	3936
	21st to end	Night	58% 5% 10% 20% 6%	4526
November	1st to 10th	Night	63% 7% 12% 13% 5%	2733
	11th to 20th	Night	57% 7% 14% 17% 4	2773
	21st to end	Night	62% 7% 11% 16% 3	2850
December	1st to 10th	Night	61% 8% 12% 13% 5%	3014
	11th to 20th	Night	62% 7% 12% 15% 4	3770
	21st to end	Night	60% 8% 10% 16% 6% 1	5577

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	11% 12% 38% 26% 11% 2	180
	11th to 20th	Day	25% 14% 31% 21% 9% 1	180
	21st to end	Day	16% 14% 33% 28% 8%	297
February	1st to 10th	Day	16% 13% 29% 28% 11% 3	370
	11th to 20th	Day	16% 15% 32% 24% 11% 1	366
	21st to end	Day	14% 17% 35% 21% 9% 5%	307
March	1st to 10th	Day	18% 16% 28% 24% 12% 3	370
	11th to 20th	Day	21% 15% 26% 23% 13% 3	429
	21st to end	Day	25% 18% 32% 18% 6% 2	506
April	1st to 10th	Day	29% 17% 28% 16% 8% 2	460
	11th to 20th	Day	22% 13% 32% 19% 9% 4	502
	21st to end	Day	29% 15% 23% 18% 12% 2	650
May	1st to 10th	Day	35% 13% 22% 19% 9% 2	653
	11th to 20th	Day	35% 12% 21% 17% 12% 4	674
	21st to end	Day	35% 12% 26% 18% 7% 2	735
June	1st to 10th	Day	32% 11% 24% 21% 10% 2	680
	11th to 20th	Day	36% 11% 21% 21% 10% 2	680
	21st to end	Day	31% 13% 25% 19% 10% 3	680
July	1st to 10th	Day	27% 8% 24% 24% 15% 2	670
	11th to 20th	Day	25% 10% 27% 29% 8% 1	668
	21st to end	Day	25% 8% 23% 26% 16% 3	740
August	1st to 10th	Day	26% 7% 24% 24% 16% 3	675
	11th to 20th	Day	26% 8% 26% 23% 14% 3	667
	21st to end	Day	27% 9% 27% 22% 12% 3	589
September	1st to 10th	Day	25% 17% 33% 17% 7% 1	490
	11th to 20th	Day	27% 17% 30% 17% 8% 1	488
	21st to end	Day	26% 19% 32% 14% 6% 3	390
October	1st to 10th	Day	25% 23% 29% 15% 5% 2	390
	11th to 20th	Day	35% 15% 23% 17% 7% 3	390
	21st to end	Day	28% 18% 26% 17% 9% 3	429
November	1st to 10th	Day	27% 22% 28% 18% 4 1	395
	11th to 20th	Day	26% 14% 33% 20% 6% 1	373
	21st to end	Day	34% 12% 28% 22% 4 1	370
December	1st to 10th	Day	24% 12% 33% 20% 9% 2	204
	11th to 20th	Day	23% 19% 34% 20% 3 1	180
	21st to end	Day	21% 19% 28% 20% 10% 2	198
January	1st to 10th	Night	24% 9% 32% 26% 9% 1	850
	11th to 20th	Night	20% 13% 34% 25% 7%	850
	21st to end	Night	16% 12% 32% 30% 9%	935
February	1st to 10th	Night	14% 9% 32% 30% 12% 2	850
	11th to 20th	Night	21% 13% 31% 25% 8% 2	746
	21st to end	Night	18% 11% 31% 24% 12% 3	628
March	1st to 10th	Night	18% 15% 28% 24% 12% 2	760
	11th to 20th	Night	22% 13% 27% 28% 10% 1	760
	21st to end	Night	29% 12% 28% 23% 7% 1	679
April	1st to 10th	Night	31% 13% 24% 26% 6%	570
	11th to 20th	Night	24% 12% 27% 24% 10% 2	564
	21st to end	Night	28% 12% 24% 26% 10% 1	570
May	1st to 10th	Night	30% 8% 23% 29% 9% 1	570
	11th to 20th	Night	32% 12% 22% 21% 12% 1	562
	21st to end	Night	36% 11% 21% 22% 9% 1	439
June	1st to 10th	Night	31% 8% 20% 31% 10%	380
	11th to 20th	Night	27% 9% 27% 30% 7%	380
	21st to end	Night	24% 7% 26% 27% 16%	380
July	1st to 10th	Night	24% 5% 21% 32% 16% 1	370
	11th to 20th	Night	19% 9% 28% 35% 9%	368
	21st to end	Night	22% 6% 20% 39% 13%	477
August	1st to 10th	Night	21% 7% 27% 30% 15% 1	568
	11th to 20th	Night	24% 8% 24% 32% 12% 1	562
	21st to end	Night	23% 8% 25% 30% 13%	627
September	1st to 10th	Night	27% 12% 27% 28% 5%	570
	11th to 20th	Night	30% 10% 29% 25% 5%	570
	21st to end	Night	29% 11% 31% 22% 7%	636
October	1st to 10th	Night	29% 15% 28% 22% 7%	760
	11th to 20th	Night	31% 12% 27% 23% 8%	810
	21st to end	Night	32% 13% 25% 21% 9% 1	946
November	1st to 10th	Night	28% 17% 30% 19% 5% 1	880
	11th to 20th	Night	26% 14% 32% 23% 4 1	856
	21st to end	Night	32% 12% 33% 18% 5%	850
December	1st to 10th	Night	23% 15% 30% 21% 10% 1	850
	11th to 20th	Night	23% 15% 31% 22% 7% 1	850
	21st to end	Night	22% 13% 30% 22% 12% 1	935

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