Bouctouche
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bouctouche clear sky chart from 2005-11-06 to 2026-05-02.

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	17% 11% 3 8% 5% 4 4 4 5% 7% 32%	131827
	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 33%	130824
Transparency	Day	50% 7% 12% 21% 10% 1	135357
	Night	51% 6% 12% 20% 10% 1	135381
Seeing	Day	22% 11% 29% 27% 9% 1	18696
	Night	23% 11% 32% 26% 7% 1	26391

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	14% 19% 5% 12% 6% 5% 4 3 4 4 25%	4093
	11th to 20th	Day	15% 16% 7% 11% 5% 4 3 3 3 4 27%	4293
	21st to end	Day	8% 10% 4 8% 6% 3 4 3 5% 7% 42%	5781
February	1st to 10th	Day	14% 12% 4 9% 5% 5% 5% 3 5% 5% 31%	1890
	11th to 20th	Day	15% 14% 4 9% 5% 5% 5% 4 5% 5% 30%	1843
	21st to end	Day	11% 14% 5% 8% 5% 5% 4 3 5% 6% 34%	1567
March	1st to 10th	Day	21% 14% 5% 11% 5% 4 4 3 4 5% 24%	4989
	11th to 20th	Day	16% 14% 4 11% 5% 5% 5% 4 5% 6% 24%	5090
	21st to end	Day	24% 16% 4 8% 4 4 4 3 5% 6% 23%	5587
April	1st to 10th	Day	21% 12% 4 9% 5% 5% 4 3 4 6% 27%	2490
	11th to 20th	Day	22% 11% 3 7% 5% 4 4 3 4 7% 32%	2655
	21st to end	Day	23% 11% 4 7% 4 4 4 3 5% 7% 29%	2730
May	1st to 10th	Day	25% 14% 3 8% 5% 4 4 3 4 5% 24%	6082
	11th to 20th	Day	21% 10% 3 7% 4 4 4 3 5% 7% 33%	6318
	21st to end	Day	18% 11% 3 7% 5% 5% 5% 4 6% 7% 29%	6948
June	1st to 10th	Day	25% 10% 3 6% 5% 4 5% 4 5% 7% 27%	2989
	11th to 20th	Day	18% 7% 3 6% 5% 5% 5% 4 6% 7% 34%	3000
	21st to end	Day	24% 10% 3 7% 4 5% 4 4 5% 6% 29%	3000
July	1st to 10th	Day	15% 8% 3 8% 5% 6% 6% 5% 7% 9% 28%	6820
	11th to 20th	Day	13% 6% 2 6% 5% 4 5% 4 6% 8% 40%	6776
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 7% 8% 40%	6798
August	1st to 10th	Day	17% 7% 3 8% 6% 4 5% 4 6% 7% 33%	4235
	11th to 20th	Day	13% 5% 2 7% 5% 6% 6% 4 7% 8% 37%	4175
	21st to end	Day	14% 5% 1 4 4 4 4 4 6% 8% 46%	4586
September	1st to 10th	Day	15% 5% 2 6% 4 4 4 4 6% 8% 43%	2400
	11th to 20th	Day	17% 6% 3 6% 4 5% 3 3 4 5% 44%	2286
	21st to end	Day	16% 6% 3 6% 5% 4 4 3 4 6% 43%	2160
October	1st to 10th	Day	17% 7% 2 5% 5% 4 4 4 4 7% 42%	2000
	11th to 20th	Day	17% 10% 3 8% 5% 4 4 5% 4 7% 35%	2000
	21st to end	Day	20% 8% 3 7% 5% 5% 4 4 5% 6% 32%	2153
November	1st to 10th	Day	18% 10% 2 8% 4 5% 6% 3 5% 6% 32%	1655
	11th to 20th	Day	19% 14% 4 6% 6% 5% 4 3 4 6% 30%	1680
	21st to end	Day	18% 15% 3 7% 5% 4 4 4 6% 6% 29%	1680
December	1st to 10th	Day	18% 12% 4 7% 4 4 3 3 6% 7% 33%	2690
	11th to 20th	Day	18% 14% 4 8% 5% 3 3 3 3 4 36%	2835
	21st to end	Day	15% 12% 5% 13% 6% 5% 4 2 3 4 30%	3553
January	1st to 10th	Night	14% 17% 5% 9% 4 4 3 3 4 6% 31%	8831
	11th to 20th	Night	16% 16% 6% 10% 5% 4 4 3 4 5% 27%	8598
	21st to end	Night	8% 11% 4 8% 5% 4 4 3 5% 6% 41%	8400
February	1st to 10th	Night	15% 14% 3 8% 5% 4 5% 4 5% 6% 30%	2730
	11th to 20th	Night	16% 15% 4 10% 6% 5% 5% 3 5% 5% 28%	2663
	21st to end	Night	13% 14% 4 7% 6% 4 4 4 4 6% 35%	2236
March	1st to 10th	Night	26% 14% 4 9% 5% 4 4 3 3 4 25%	5070
	11th to 20th	Night	22% 14% 4 8% 5% 5% 4 3 4 5% 25%	5089
	21st to end	Night	27% 12% 4 8% 5% 3 3 3 4 4 26%	5587
April	1st to 10th	Night	22% 13% 3 8% 6% 5% 4 4 4 4 26%	2129
	11th to 20th	Night	24% 10% 3 7% 4 4 4 3 4 5% 32%	1910
	21st to end	Night	22% 12% 3 7% 4 4 3 2 4 6% 31%	1890
May	1st to 10th	Night	29% 12% 3 6% 4 5% 4 3 5% 5% 25%	3888
	11th to 20th	Night	22% 8% 3 6% 4 3 4 3 4 7% 35%	3596
	21st to end	Night	18% 9% 2 6% 5% 4 4 4 5% 7% 34%	3948
June	1st to 10th	Night	24% 10% 3 6% 3 3 5% 3 6% 7% 30%	1428
	11th to 20th	Night	20% 9% 3 6% 4 4 4 3 5% 7% 37%	1400
	21st to end	Night	25% 8% 4 7% 4 5% 4 4 4 6% 28%	1400
July	1st to 10th	Night	15% 7% 3 8% 6% 6% 5% 5% 7% 8% 30%	3160
	11th to 20th	Night	10% 7% 3 9% 7% 5% 5% 4 6% 8% 37%	3160
	21st to end	Night	12% 6% 2 8% 4 4 5% 4 6% 8% 40%	4062
August	1st to 10th	Night	16% 7% 4 9% 5% 6% 6% 4 7% 7% 30%	2915
	11th to 20th	Night	10% 6% 2 8% 6% 6% 5% 4 6% 8% 39%	2872
	21st to end	Night	13% 5% 2 6% 4 4 3 3 6% 7% 48%	3312
September	1st to 10th	Night	15% 6% 3 5% 4 4 4 3 5% 7% 45%	2000
	11th to 20th	Night	15% 7% 2 4 4 3 3 3 6% 5% 47%	2110
	21st to end	Night	16% 6% 2 5% 4 4 3 4 5% 6% 44%	2239
October	1st to 10th	Night	18% 6% 2 6% 4 4 4 3 5% 7% 40%	2400
	11th to 20th	Night	18% 7% 2 7% 5% 4 4 3 4 7% 39%	2400
	21st to end	Night	22% 9% 3 6% 5% 5% 4 3 5% 6% 34%	2685
November	1st to 10th	Night	20% 11% 3 5% 4 4 5% 4 5% 6% 35%	2861
	11th to 20th	Night	20% 11% 3 7% 5% 5% 4 3 5% 6% 31%	2940
	21st to end	Night	23% 11% 3 7% 5% 4 3 3 4 5% 32%	2940
December	1st to 10th	Night	15% 10% 3 6% 4 5% 4 3 5% 6% 39%	4720
	11th to 20th	Night	17% 14% 4 7% 3 3 3 2 4 4 38%	5588
	21st to end	Night	21% 13% 4 11% 3 4 3 3 4 5% 28%	7667

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	63% 5% 9% 14% 9%	4094
	11th to 20th	Day	60% 5% 10% 13% 11% 1	4319
	21st to end	Day	43% 5% 10% 21% 19% 2	5781
February	1st to 10th	Day	54% 5% 11% 17% 11% 2	1890
	11th to 20th	Day	55% 6% 10% 18% 10% 1	1851
	21st to end	Day	49% 5% 11% 20% 12% 2	1567
March	1st to 10th	Day	62% 5% 8% 13% 10% 2	4993
	11th to 20th	Day	57% 8% 14% 15% 5% 2	5090
	21st to end	Day	61% 4 6% 18% 9% 1	5587
April	1st to 10th	Day	58% 5% 9% 16% 10% 3	2490
	11th to 20th	Day	52% 5% 11% 20% 11% 1	2655
	21st to end	Day	53% 7% 10% 16% 12% 3	2730
May	1st to 10th	Day	60% 7% 9% 15% 9% 1	6093
	11th to 20th	Day	51% 7% 13% 24% 5%	6322
	21st to end	Day	49% 10% 12% 19% 9%	6948
June	1st to 10th	Day	55% 7% 13% 18% 8%	2989
	11th to 20th	Day	48% 8% 13% 22% 9% 1	3000
	21st to end	Day	55% 8% 11% 16% 9% 1	3000
July	1st to 10th	Day	50% 7% 16% 19% 7%	6745
	11th to 20th	Day	40% 6% 15% 29% 9% 1	6695
	21st to end	Day	40% 8% 17% 28% 6%	6603
August	1st to 10th	Day	49% 7% 12% 24% 7%	4222
	11th to 20th	Day	41% 9% 15% 25% 10%	4214
	21st to end	Day	34% 7% 15% 27% 16% 1	4586
September	1st to 10th	Day	37% 7% 17% 27% 12%	2400
	11th to 20th	Day	43% 5% 13% 25% 13% 1	2286
	21st to end	Day	42% 5% 11% 26% 15% 1	2160
October	1st to 10th	Day	43% 8% 12% 28% 9% 1	3260
	11th to 20th	Day	45% 6% 10% 30% 10%	3240
	21st to end	Day	41% 5% 17% 20% 17%	3455
November	1st to 10th	Day	51% 8% 12% 20% 8% 1	1655
	11th to 20th	Day	56% 6% 13% 14% 10% 1	1680
	21st to end	Day	55% 8% 15% 16% 6%	1680
December	1st to 10th	Day	51% 6% 12% 22% 8%	2690
	11th to 20th	Day	54% 4 10% 18% 11% 2	2834
	21st to end	Day	58% 6% 11% 18% 7% 1	3553
January	1st to 10th	Night	56% 4 11% 23% 6%	8831
	11th to 20th	Night	60% 5% 10% 16% 8% 1	8647
	21st to end	Night	44% 4 10% 22% 17% 3	8400
February	1st to 10th	Night	55% 5% 10% 17% 11% 2	2730
	11th to 20th	Night	57% 5% 9% 17% 10% 1	2666
	21st to end	Night	50% 6% 9% 21% 12% 3	2236
March	1st to 10th	Night	63% 4 7% 12% 13% 2	5079
	11th to 20th	Night	61% 6% 11% 13% 8% 1	5090
	21st to end	Night	62% 3 5% 16% 12% 2	5587
April	1st to 10th	Night	60% 6% 7% 14% 11% 3	2129
	11th to 20th	Night	54% 5% 10% 20% 11% 1	1910
	21st to end	Night	55% 5% 10% 15% 14% 2	1890
May	1st to 10th	Night	60% 6% 9% 14% 10% 1	3894
	11th to 20th	Night	48% 8% 13% 21% 8% 1	3597
	21st to end	Night	46% 10% 17% 19% 7%	3949
June	1st to 10th	Night	52% 7% 14% 18% 9%	1428
	11th to 20th	Night	47% 7% 11% 23% 10% 1	1400
	21st to end	Night	56% 7% 12% 14% 9% 1	1400
July	1st to 10th	Night	50% 8% 13% 21% 9%	3125
	11th to 20th	Night	44% 7% 16% 26% 7%	3118
	21st to end	Night	41% 8% 17% 24% 10%	3943
August	1st to 10th	Night	52% 8% 12% 21% 7%	2903
	11th to 20th	Night	41% 8% 18% 22% 9%	2899
	21st to end	Night	35% 6% 16% 27% 14% 1	3311
September	1st to 10th	Night	38% 7% 12% 29% 14%	2000
	11th to 20th	Night	38% 6% 13% 29% 13% 1	2110
	21st to end	Night	39% 7% 12% 26% 15% 1	2239
October	1st to 10th	Night	48% 6% 11% 27% 9%	3920
	11th to 20th	Night	37% 6% 12% 33% 11%	3899
	21st to end	Night	44% 5% 14% 23% 14%	4333
November	1st to 10th	Night	50% 7% 13% 20% 9% 1	2861
	11th to 20th	Night	55% 6% 12% 18% 8% 1	2940
	21st to end	Night	56% 7% 13% 17% 7%	2940
December	1st to 10th	Night	46% 5% 14% 25% 10%	4720
	11th to 20th	Night	51% 4 10% 21% 12% 2	5590
	21st to end	Night	59% 5% 11% 17% 8%	7667

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	28% 18% 30% 21% 3	220
	11th to 20th	Day	29% 15% 34% 17% 6%	262
	21st to end	Day	15% 14% 36% 28% 7%	473
February	1st to 10th	Day	21% 16% 33% 23% 6% 1	430
	11th to 20th	Day	23% 15% 36% 19% 6% 1	426
	21st to end	Day	16% 15% 35% 27% 7%	361
March	1st to 10th	Day	23% 16% 36% 22% 2 1	540
	11th to 20th	Day	20% 18% 32% 22% 7% 1	540
	21st to end	Day	27% 15% 33% 20% 4 1	594
April	1st to 10th	Day	28% 16% 34% 18% 4	540
	11th to 20th	Day	24% 13% 33% 23% 6% 1	532
	21st to end	Day	26% 11% 28% 26% 8% 1	540
May	1st to 10th	Day	30% 9% 32% 21% 8%	586
	11th to 20th	Day	23% 8% 27% 27% 13% 1	724
	21st to end	Day	21% 11% 27% 32% 7% 1	790
June	1st to 10th	Day	27% 10% 26% 27% 9% 1	730
	11th to 20th	Day	20% 8% 28% 33% 10% 2	730
	21st to end	Day	26% 7% 23% 30% 12% 1	730
July	1st to 10th	Day	19% 4 28% 34% 15% 1	720
	11th to 20th	Day	14% 6% 25% 38% 15% 2	718
	21st to end	Day	15% 4 24% 41% 14% 2	741
August	1st to 10th	Day	13% 5% 21% 40% 19% 2	526
	11th to 20th	Day	15% 6% 21% 36% 18% 3	519
	21st to end	Day	15% 6% 25% 33% 17% 4	583
September	1st to 10th	Day	14% 7% 30% 33% 13% 3	530
	11th to 20th	Day	21% 10% 23% 31% 12% 3	530
	21st to end	Day	17% 10% 31% 30% 11% 3	508
October	1st to 10th	Day	19% 10% 28% 27% 14% 1	420
	11th to 20th	Day	22% 13% 29% 22% 13% 1	420
	21st to end	Day	26% 15% 33% 18% 8% 1	462
November	1st to 10th	Day	23% 18% 31% 23% 5% 1	425
	11th to 20th	Day	29% 16% 30% 19% 4 1	430
	21st to end	Day	27% 15% 37% 17% 3 1	430
December	1st to 10th	Day	27% 16% 34% 19% 4	430
	11th to 20th	Day	27% 22% 35% 13% 2	314
	21st to end	Day	17% 24% 33% 20% 5%	242
January	1st to 10th	Night	25% 12% 38% 21% 4	950
	11th to 20th	Night	23% 14% 34% 23% 5%	933
	21st to end	Night	18% 13% 39% 22% 8%	924
February	1st to 10th	Night	24% 11% 37% 21% 5% 1	840
	11th to 20th	Night	25% 10% 40% 21% 3 1	823
	21st to end	Night	21% 9% 35% 29% 5%	692
March	1st to 10th	Night	24% 12% 35% 26% 3	840
	11th to 20th	Night	25% 10% 32% 24% 8% 1	840
	21st to end	Night	27% 13% 31% 23% 6%	924
April	1st to 10th	Night	29% 13% 27% 26% 4	659
	11th to 20th	Night	28% 9% 30% 26% 6%	624
	21st to end	Night	27% 10% 29% 24% 9% 1	630
May	1st to 10th	Night	31% 8% 25% 25% 9% 1	604
	11th to 20th	Night	26% 4 27% 29% 13% 1	592
	21st to end	Night	18% 8% 35% 33% 6%	649
June	1st to 10th	Night	29% 6% 24% 33% 8%	428
	11th to 20th	Night	22% 5% 27% 37% 9% 1	400
	21st to end	Night	24% 6% 26% 32% 12% 1	400
July	1st to 10th	Night	18% 4 26% 38% 13% 1	390
	11th to 20th	Night	16% 2 27% 43% 11% 1	388
	21st to end	Night	16% 6% 25% 42% 12% 1	651
August	1st to 10th	Night	18% 3 23% 41% 14% 1	598
	11th to 20th	Night	16% 5% 21% 38% 18% 2	592
	21st to end	Night	15% 5% 26% 37% 17% 1	660
September	1st to 10th	Night	18% 6% 31% 34% 11%	600
	11th to 20th	Night	19% 8% 27% 35% 12% 1	710
	21st to end	Night	18% 9% 32% 31% 9% 1	800
October	1st to 10th	Night	21% 8% 33% 27% 10% 1	800
	11th to 20th	Night	22% 12% 33% 24% 9% 1	800
	21st to end	Night	27% 17% 31% 21% 4	880
November	1st to 10th	Night	25% 16% 34% 21% 4	925
	11th to 20th	Night	26% 18% 31% 18% 6% 1	950
	21st to end	Night	29% 18% 32% 19% 3	950
December	1st to 10th	Night	28% 15% 38% 16% 3	950
	11th to 20th	Night	25% 22% 35% 15% 3	950
	21st to end	Night	28% 15% 33% 20% 4 1	1045

Page generated at 2026-04-29 03:21:45. Version ac07

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