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 2025-01-07.

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% 10% 3 8% 5% 5% 4 4 5% 7% 32%	105082
	Night	18% 11% 3 8% 5% 4 4 3 5% 6% 34%	104062
Transparency	Day	49% 7% 13% 20% 9% 1	108633
	Night	50% 6% 12% 21% 10% 1	108600
Seeing	Day	22% 10% 29% 28% 10% 1	16945
	Night	23% 10% 32% 27% 8% 1	24625

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	15% 13% 4 10% 5% 5% 5% 3 5% 5% 30%	2249
	11th to 20th	Day	14% 13% 4 9% 5% 5% 3 3 4 5% 35%	2311
	21st to end	Day	11% 10% 4 10% 7% 3 4 3 5% 6% 36%	3124
February	1st to 10th	Day	16% 11% 4 9% 5% 5% 5% 4 5% 5% 31%	1710
	11th to 20th	Day	15% 13% 4 9% 5% 5% 5% 4 6% 5% 28%	1663
	21st to end	Day	11% 14% 5% 8% 5% 5% 4 3 5% 7% 33%	1422
March	1st to 10th	Day	22% 15% 5% 9% 4 4 5% 3 4 5% 25%	3394
	11th to 20th	Day	15% 18% 5% 13% 6% 6% 5% 3 4 5% 21%	3480
	21st to end	Day	26% 15% 4 8% 4 4 3 3 5% 6% 22%	3816
April	1st to 10th	Day	21% 12% 4 8% 6% 6% 4 3 4 6% 27%	2252
	11th to 20th	Day	21% 11% 2 6% 4 4 4 3 4 7% 33%	2399
	21st to end	Day	23% 11% 4 7% 4 5% 3 3 5% 7% 28%	2470
May	1st to 10th	Day	23% 14% 3 8% 5% 4 4 3 4 6% 25%	4233
	11th to 20th	Day	16% 9% 3 7% 4 4 4 3 5% 7% 37%	4398
	21st to end	Day	14% 9% 3 8% 6% 6% 6% 4 7% 7% 28%	4836
June	1st to 10th	Day	26% 10% 3 6% 5% 4 5% 4 5% 7% 26%	2839
	11th to 20th	Day	19% 7% 3 6% 4 5% 5% 4 6% 7% 34%	2850
	21st to end	Day	24% 10% 3 7% 4 5% 4 4 5% 6% 29%	2850
July	1st to 10th	Day	14% 7% 3 8% 6% 6% 6% 4 7% 8% 32%	4760
	11th to 20th	Day	15% 7% 3 6% 5% 5% 6% 5% 6% 8% 34%	4730
	21st to end	Day	11% 7% 3 7% 5% 5% 5% 4 7% 8% 37%	4728
August	1st to 10th	Day	17% 8% 3 8% 6% 4 5% 4 6% 7% 32%	4105
	11th to 20th	Day	13% 6% 2 7% 5% 6% 6% 4 7% 8% 37%	4045
	21st to end	Day	14% 5% 1 4 4 4 4 4 6% 8% 46%	4446
September	1st to 10th	Day	15% 5% 2 6% 4 4 4 4 6% 8% 42%	2280
	11th to 20th	Day	18% 6% 3 6% 4 5% 3 3 4 5% 43%	2172
	21st to end	Day	16% 6% 3 6% 5% 4 4 3 4 6% 42%	2052
October	1st to 10th	Day	17% 7% 2 5% 5% 4 4 4 4 7% 41%	1900
	11th to 20th	Day	17% 10% 2 8% 5% 4 4 4 4 6% 35%	1900
	21st to end	Day	20% 8% 3 7% 5% 5% 4 4 5% 6% 33%	2046
November	1st to 10th	Day	18% 11% 2 9% 4 5% 5% 3 5% 6% 31%	1575
	11th to 20th	Day	19% 13% 4 6% 6% 5% 4 3 4 6% 30%	1600
	21st to end	Day	18% 16% 3 7% 5% 4 4 4 6% 6% 29%	1600
December	1st to 10th	Day	18% 12% 4 7% 4 4 3 3 6% 7% 33%	2610
	11th to 20th	Day	19% 14% 4 7% 5% 3 3 3 3 4 36%	2761
	21st to end	Day	16% 13% 5% 13% 6% 5% 4 2 3 4 30%	3476
January	1st to 10th	Night	12% 13% 4 8% 4 4 4 3 5% 7% 36%	4839
	11th to 20th	Night	14% 12% 4 9% 5% 5% 4 3 4 6% 33%	4653
	21st to end	Night	13% 13% 5% 9% 7% 4 3 3 4 6% 34%	4532
February	1st to 10th	Night	16% 13% 3 8% 5% 4 5% 4 5% 6% 30%	2470
	11th to 20th	Night	16% 15% 4 9% 6% 5% 5% 3 5% 5% 28%	2403
	21st to end	Night	13% 14% 4 7% 6% 4 4 4 4 6% 34%	2030
March	1st to 10th	Night	24% 14% 4 11% 4 5% 4 3 4 4 24%	3445
	11th to 20th	Night	23% 17% 4 8% 5% 5% 4 3 4 5% 21%	3479
	21st to end	Night	28% 11% 4 8% 5% 4 4 3 5% 4 24%	3816
April	1st to 10th	Night	23% 13% 3 7% 5% 5% 4 4 4 5% 27%	1927
	11th to 20th	Night	23% 11% 3 7% 4 4 4 3 4 6% 32%	1726
	21st to end	Night	22% 12% 3 7% 4 4 4 2 5% 6% 32%	1710
May	1st to 10th	Night	27% 12% 2 6% 4 5% 4 4 5% 5% 25%	2710
	11th to 20th	Night	17% 9% 2 6% 4 3 4 3 5% 9% 39%	2506
	21st to end	Night	16% 10% 3 8% 5% 5% 5% 5% 6% 8% 29%	2749
June	1st to 10th	Night	24% 10% 3 6% 3 3 5% 3 6% 7% 30%	1357
	11th to 20th	Night	20% 9% 3 6% 4 3 4 3 5% 7% 37%	1330
	21st to end	Night	25% 8% 4 7% 4 5% 4 4 5% 6% 28%	1330
July	1st to 10th	Night	13% 8% 3 8% 5% 6% 5% 4 7% 7% 34%	2210
	11th to 20th	Night	12% 8% 3 7% 7% 6% 5% 4 7% 8% 34%	2210
	21st to end	Night	11% 6% 3 8% 4 4 5% 4 6% 8% 42%	2825
August	1st to 10th	Night	16% 8% 4 9% 5% 6% 6% 4 7% 7% 28%	2825
	11th to 20th	Night	10% 6% 2 8% 6% 7% 5% 4 6% 8% 38%	2782
	21st to end	Night	13% 5% 2 5% 4 4 3 3 6% 7% 49%	3210
September	1st to 10th	Night	15% 6% 2 5% 4 4 4 3 5% 7% 45%	1900
	11th to 20th	Night	16% 7% 2 4 4 3 3 3 6% 5% 46%	2004
	21st to end	Night	16% 6% 2 6% 4 4 3 4 5% 6% 44%	2127
October	1st to 10th	Night	19% 7% 3 6% 4 4 4 3 5% 7% 39%	2280
	11th to 20th	Night	17% 7% 2 8% 5% 4 4 3 4 7% 40%	2280
	21st to end	Night	22% 8% 3 6% 5% 5% 4 3 4 5% 34%	2551
November	1st to 10th	Night	20% 10% 3 5% 4 4 4 4 5% 6% 35%	2721
	11th to 20th	Night	20% 11% 3 7% 5% 5% 4 3 5% 6% 31%	2800
	21st to end	Night	24% 11% 3 7% 5% 4 3 3 4 5% 31%	2800
December	1st to 10th	Night	15% 10% 3 6% 4 5% 4 3 5% 6% 39%	4580
	11th to 20th	Night	17% 14% 4 7% 3 3 3 2 4 4 38%	5443
	21st to end	Night	21% 13% 5% 11% 3 4 3 3 4 5% 28%	7502

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	55% 8% 11% 18% 7%	2250
	11th to 20th	Day	50% 7% 8% 19% 15% 1	2311
	21st to end	Day	46% 8% 14% 16% 14% 1	3124
February	1st to 10th	Day	53% 5% 12% 17% 11% 2	1710
	11th to 20th	Day	56% 6% 10% 18% 9% 1	1671
	21st to end	Day	49% 6% 12% 20% 12% 3	1422
March	1st to 10th	Day	58% 7% 10% 17% 6% 2	3398
	11th to 20th	Day	61% 9% 10% 13% 5% 1	3480
	21st to end	Day	62% 5% 7% 16% 8% 2	3816
April	1st to 10th	Day	58% 5% 9% 16% 9% 3	2252
	11th to 20th	Day	51% 6% 11% 20% 11% 1	2399
	21st to end	Day	53% 7% 9% 16% 12% 3	2470
May	1st to 10th	Day	56% 9% 10% 17% 7% 1	4247
	11th to 20th	Day	44% 9% 15% 24% 7%	4402
	21st to end	Day	47% 13% 14% 17% 8%	4836
June	1st to 10th	Day	56% 7% 13% 17% 7%	2839
	11th to 20th	Day	48% 7% 13% 22% 8% 1	2850
	21st to end	Day	56% 8% 11% 16% 8% 1	2850
July	1st to 10th	Day	47% 8% 17% 18% 10% 1	4685
	11th to 20th	Day	45% 8% 15% 24% 8%	4649
	21st to end	Day	41% 9% 18% 25% 7%	4577
August	1st to 10th	Day	51% 7% 12% 23% 6%	4092
	11th to 20th	Day	42% 9% 14% 25% 10%	4084
	21st to end	Day	34% 7% 15% 27% 16% 1	4446
September	1st to 10th	Day	38% 7% 17% 25% 13%	2280
	11th to 20th	Day	43% 5% 12% 25% 13% 1	2172
	21st to end	Day	43% 6% 11% 25% 14% 1	2052
October	1st to 10th	Day	43% 8% 13% 27% 9% 1	3160
	11th to 20th	Day	45% 6% 10% 30% 10%	3140
	21st to end	Day	40% 5% 17% 21% 17%	3348
November	1st to 10th	Day	51% 9% 12% 20% 8% 1	1575
	11th to 20th	Day	56% 7% 13% 13% 10% 1	1600
	21st to end	Day	56% 8% 15% 16% 6%	1600
December	1st to 10th	Day	51% 6% 12% 22% 8%	2610
	11th to 20th	Day	54% 4 10% 18% 11% 2	2760
	21st to end	Day	58% 6% 11% 18% 7% 1	3476
January	1st to 10th	Night	47% 6% 16% 24% 5% 1	4839
	11th to 20th	Night	49% 8% 10% 22% 10% 1	4653
	21st to end	Night	51% 5% 11% 22% 9% 1	4532
February	1st to 10th	Night	54% 5% 11% 17% 11% 2	2470
	11th to 20th	Night	57% 6% 9% 16% 11% 1	2406
	21st to end	Night	50% 6% 9% 20% 12% 3	2030
March	1st to 10th	Night	62% 5% 9% 16% 7% 2	3454
	11th to 20th	Night	64% 7% 8% 12% 8% 1	3480
	21st to end	Night	63% 4 6% 16% 10% 2	3816
April	1st to 10th	Night	58% 6% 8% 14% 11% 3	1927
	11th to 20th	Night	52% 5% 10% 19% 12% 1	1726
	21st to end	Night	54% 5% 10% 15% 15% 2	1710
May	1st to 10th	Night	57% 8% 13% 14% 7% 1	2716
	11th to 20th	Night	41% 9% 17% 24% 7% 1	2507
	21st to end	Night	47% 13% 17% 16% 7%	2750
June	1st to 10th	Night	53% 8% 15% 17% 8%	1357
	11th to 20th	Night	47% 8% 11% 23% 10% 1	1330
	21st to end	Night	56% 7% 13% 15% 9% 1	1330
July	1st to 10th	Night	47% 8% 14% 21% 11%	2175
	11th to 20th	Night	46% 9% 16% 22% 7%	2168
	21st to end	Night	39% 9% 17% 24% 11%	2736
August	1st to 10th	Night	54% 8% 12% 20% 6%	2813
	11th to 20th	Night	42% 9% 18% 22% 9%	2809
	21st to end	Night	35% 6% 16% 27% 15% 1	3209
September	1st to 10th	Night	38% 7% 12% 28% 14%	1900
	11th to 20th	Night	39% 6% 13% 29% 13%	2004
	21st to end	Night	40% 7% 12% 26% 14% 1	2127
October	1st to 10th	Night	49% 6% 11% 27% 8%	3800
	11th to 20th	Night	36% 6% 12% 34% 11%	3779
	21st to end	Night	44% 5% 15% 23% 14%	4199
November	1st to 10th	Night	49% 7% 14% 20% 9% 1	2721
	11th to 20th	Night	55% 6% 12% 17% 9% 1	2800
	21st to end	Night	56% 7% 13% 17% 7%	2800
December	1st to 10th	Night	46% 5% 14% 25% 10%	4580
	11th to 20th	Night	51% 4 10% 22% 12% 2	5445
	21st to end	Night	59% 5% 11% 17% 8%	7502

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	27% 18% 30% 23% 3	192
	11th to 20th	Day	27% 16% 35% 17% 5%	218
	21st to end	Day	16% 11% 35% 30% 8%	407
February	1st to 10th	Day	24% 14% 34% 22% 6% 1	370
	11th to 20th	Day	22% 16% 36% 20% 5%	366
	21st to end	Day	16% 14% 35% 28% 8%	312
March	1st to 10th	Day	23% 14% 36% 24% 2 1	460
	11th to 20th	Day	17% 16% 32% 25% 9% 1	460
	21st to end	Day	26% 12% 33% 23% 5% 1	506
April	1st to 10th	Day	26% 14% 35% 21% 5%	460
	11th to 20th	Day	23% 12% 32% 25% 7% 1	452
	21st to end	Day	26% 11% 28% 26% 8% 2	460
May	1st to 10th	Day	29% 9% 31% 22% 9%	538
	11th to 20th	Day	23% 8% 26% 28% 14% 1	674
	21st to end	Day	21% 10% 27% 33% 7% 1	735
June	1st to 10th	Day	28% 9% 26% 26% 9% 1	680
	11th to 20th	Day	21% 7% 26% 33% 11% 2	680
	21st to end	Day	26% 6% 23% 31% 13% 1	680
July	1st to 10th	Day	19% 4 27% 34% 15% 1	670
	11th to 20th	Day	15% 6% 24% 38% 16% 2	668
	21st to end	Day	15% 4 22% 42% 15% 2	689
August	1st to 10th	Day	14% 4 21% 40% 19% 2	486
	11th to 20th	Day	16% 5% 21% 36% 19% 3	479
	21st to end	Day	16% 5% 24% 34% 18% 4	539
September	1st to 10th	Day	14% 6% 30% 34% 13% 2	490
	11th to 20th	Day	22% 10% 23% 30% 12% 3	490
	21st to end	Day	17% 9% 29% 30% 11% 3	470
October	1st to 10th	Day	19% 11% 27% 27% 15% 1	390
	11th to 20th	Day	21% 13% 31% 21% 14% 1	390
	21st to end	Day	25% 15% 33% 19% 7%	429
November	1st to 10th	Day	22% 16% 31% 24% 6% 1	395
	11th to 20th	Day	29% 16% 31% 19% 4 1	400
	21st to end	Day	29% 15% 37% 17% 2	400
December	1st to 10th	Day	27% 16% 33% 20% 4	400
	11th to 20th	Day	27% 22% 36% 14% 2	290
	21st to end	Day	17% 23% 35% 20% 5%	220
January	1st to 10th	Night	24% 11% 38% 22% 4	881
	11th to 20th	Night	22% 14% 36% 23% 5%	837
	21st to end	Night	19% 11% 39% 23% 8%	836
February	1st to 10th	Night	24% 10% 38% 22% 5%	760
	11th to 20th	Night	25% 10% 41% 21% 3 1	743
	21st to end	Night	21% 8% 35% 30% 6%	628
March	1st to 10th	Night	23% 10% 36% 27% 3	760
	11th to 20th	Night	25% 9% 32% 25% 8% 1	760
	21st to end	Night	26% 12% 31% 24% 6%	836
April	1st to 10th	Night	29% 11% 28% 27% 5%	597
	11th to 20th	Night	27% 9% 30% 27% 7%	564
	21st to end	Night	26% 10% 30% 24% 10% 1	570
May	1st to 10th	Night	31% 8% 25% 25% 9% 1	570
	11th to 20th	Night	25% 4 27% 30% 14% 1	562
	21st to end	Night	18% 7% 34% 33% 7%	616
June	1st to 10th	Night	29% 6% 24% 34% 8%	407
	11th to 20th	Night	22% 5% 26% 38% 9% 1	380
	21st to end	Night	24% 4 26% 33% 12% 1	380
July	1st to 10th	Night	18% 3 26% 39% 13% 1	370
	11th to 20th	Night	16% 2 25% 43% 12% 1	368
	21st to end	Night	16% 5% 23% 43% 12% 1	618
August	1st to 10th	Night	18% 3 23% 41% 14% 1	568
	11th to 20th	Night	16% 4 21% 38% 18% 2	562
	21st to end	Night	15% 4 25% 37% 18% 1	627
September	1st to 10th	Night	18% 6% 31% 34% 11%	570
	11th to 20th	Night	19% 7% 27% 35% 11% 1	674
	21st to end	Night	18% 9% 31% 32% 9% 1	760
October	1st to 10th	Night	22% 7% 34% 27% 10% 1	760
	11th to 20th	Night	21% 12% 34% 24% 9% 1	760
	21st to end	Night	27% 17% 31% 21% 4	836
November	1st to 10th	Night	25% 15% 34% 22% 4	875
	11th to 20th	Night	26% 18% 31% 18% 6% 1	900
	21st to end	Night	29% 18% 30% 19% 3	900
December	1st to 10th	Night	28% 14% 37% 17% 4	900
	11th to 20th	Night	25% 21% 34% 15% 3	900
	21st to end	Night	28% 14% 33% 20% 4 1	990

Page generated at 2025-01-04 04:24:03. Version ac07

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