Kouchibouguac National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kouchibouguac National Park clear sky chart from 2005-11-06 to 2026-06-01.

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 7% 5% 5% 4 4 5% 7% 33%	132183
	Night	18% 11% 3 8% 4 4 4 3 5% 6% 34%	131127
Transparency	Day	50% 5% 12% 22% 11% 1	135700
	Night	51% 3 11% 22% 11% 1	135698
Seeing	Day	22% 10% 30% 25% 11% 2	18751
	Night	24% 10% 31% 26% 9% 1	26415

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% 18% 5% 10% 5% 5% 4 4 5% 5% 25%	4093
	11th to 20th	Day	15% 14% 7% 11% 5% 5% 4 3 3 5% 28%	4155
	21st to end	Day	7% 9% 4 7% 6% 4 4 3 6% 8% 42%	5762
February	1st to 10th	Day	13% 11% 5% 10% 5% 4 4 4 6% 5% 32%	1890
	11th to 20th	Day	14% 14% 4 8% 6% 5% 5% 3 6% 6% 30%	1843
	21st to end	Day	11% 12% 5% 8% 6% 5% 4 4 5% 7% 34%	1573
March	1st to 10th	Day	20% 13% 4 11% 5% 4 4 3 4 6% 26%	4963
	11th to 20th	Day	16% 15% 4 10% 6% 5% 5% 4 5% 6% 25%	5090
	21st to end	Day	24% 14% 4 7% 5% 4 4 3 4 7% 24%	5587
April	1st to 10th	Day	19% 12% 4 7% 6% 4 4 3 5% 7% 28%	2485
	11th to 20th	Day	21% 9% 3 5% 4 4 4 3 5% 7% 34%	2675
	21st to end	Day	23% 10% 3 7% 4 4 3 4 4 6% 31%	2730
May	1st to 10th	Day	24% 12% 3 7% 5% 5% 5% 4 5% 5% 24%	6204
	11th to 20th	Day	22% 9% 3 7% 4 4 4 3 4 7% 33%	6458
	21st to end	Day	21% 9% 2 7% 4 5% 4 4 6% 7% 31%	7189
June	1st to 10th	Day	24% 10% 3 6% 5% 4 4 4 5% 8% 27%	3000
	11th to 20th	Day	18% 7% 3 5% 5% 5% 5% 5% 5% 8% 34%	3000
	21st to end	Day	24% 9% 3 7% 5% 5% 4 4 5% 6% 27%	3000
July	1st to 10th	Day	14% 7% 3 8% 5% 6% 6% 5% 7% 9% 28%	6820
	11th to 20th	Day	12% 6% 2 7% 5% 5% 5% 4 7% 8% 40%	6820
	21st to end	Day	11% 6% 2 6% 4 5% 5% 4 6% 9% 41%	6848
August	1st to 10th	Day	15% 7% 3 8% 6% 5% 6% 4 6% 8% 34%	4235
	11th to 20th	Day	12% 6% 2 6% 6% 5% 6% 5% 7% 8% 38%	4175
	21st to end	Day	15% 5% 2 5% 3 4 3 4 5% 9% 46%	4610
September	1st to 10th	Day	15% 5% 2 5% 3 5% 5% 3 6% 8% 44%	2400
	11th to 20th	Day	15% 6% 2 7% 4 4 4 3 4 5% 45%	2277
	21st to end	Day	17% 6% 2 5% 4 5% 3 3 5% 7% 43%	2168
October	1st to 10th	Day	15% 7% 2 6% 5% 4 4 4 5% 7% 42%	2000
	11th to 20th	Day	17% 9% 3 8% 4 4 4 4 5% 6% 36%	2000
	21st to end	Day	22% 7% 2 6% 6% 4 4 4 6% 6% 33%	2134
November	1st to 10th	Day	19% 9% 2 7% 5% 5% 5% 4 5% 7% 32%	1655
	11th to 20th	Day	21% 11% 4 7% 4 4 5% 4 4 6% 31%	1680
	21st to end	Day	18% 14% 4 7% 4 4 4 4 4 5% 31%	1680
December	1st to 10th	Day	18% 10% 3 7% 3 4 4 4 5% 7% 33%	2690
	11th to 20th	Day	18% 12% 4 9% 4 4 3 3 3 5% 34%	2741
	21st to end	Day	15% 11% 5% 10% 6% 4 4 3 4 4 33%	3553
January	1st to 10th	Night	15% 17% 4 8% 5% 4 4 3 5% 6% 31%	8831
	11th to 20th	Night	17% 16% 5% 9% 5% 4 4 3 4 5% 27%	8753
	21st to end	Night	6% 11% 4 8% 6% 4 4 3 5% 7% 43%	8404
February	1st to 10th	Night	15% 12% 5% 8% 5% 4 5% 4 6% 6% 32%	2730
	11th to 20th	Night	16% 15% 4 9% 5% 5% 4 3 5% 5% 29%	2663
	21st to end	Night	13% 14% 3 7% 5% 4 5% 3 5% 6% 36%	2231
March	1st to 10th	Night	23% 14% 4 10% 5% 5% 4 3 3 4 25%	5096
	11th to 20th	Night	22% 14% 4 8% 5% 5% 4 4 5% 5% 23%	5089
	21st to end	Night	27% 12% 4 8% 4 4 3 3 4 4 26%	5587
April	1st to 10th	Night	24% 13% 3 7% 5% 4 4 4 5% 4 28%	2134
	11th to 20th	Night	24% 10% 2 6% 4 4 4 3 4 7% 32%	1893
	21st to end	Night	22% 12% 4 7% 4 4 4 3 5% 5% 32%	1890
May	1st to 10th	Night	26% 12% 3 7% 4 4 4 3 4 6% 26%	3950
	11th to 20th	Night	23% 7% 3 7% 3 4 4 3 5% 6% 34%	3676
	21st to end	Night	18% 8% 2 8% 5% 5% 5% 4 5% 6% 34%	3992
June	1st to 10th	Night	26% 9% 4 7% 4 3 4 3 6% 5% 31%	1400
	11th to 20th	Night	18% 9% 3 5% 4 4 4 5% 5% 7% 37%	1400
	21st to end	Night	26% 8% 2 8% 6% 4 4 3 5% 7% 27%	1400
July	1st to 10th	Night	15% 7% 3 7% 6% 5% 6% 5% 7% 9% 30%	3160
	11th to 20th	Night	12% 7% 3 7% 5% 6% 5% 4 6% 8% 38%	3160
	21st to end	Night	10% 6% 2 6% 4 5% 5% 4 6% 9% 43%	3956
August	1st to 10th	Night	16% 7% 2 7% 6% 6% 6% 5% 7% 8% 31%	2915
	11th to 20th	Night	10% 7% 3 8% 5% 5% 4 4 6% 8% 39%	2872
	21st to end	Night	15% 5% 2 5% 4 4 4 3 6% 6% 46%	3287
September	1st to 10th	Night	16% 6% 2 6% 3 3 3 3 5% 8% 45%	2000
	11th to 20th	Night	14% 6% 2 5% 4 3 3 3 5% 7% 49%	2120
	21st to end	Night	17% 6% 2 5% 3 4 4 3 4 7% 45%	2231
October	1st to 10th	Night	18% 7% 3 5% 4 4 4 3 5% 7% 42%	2400
	11th to 20th	Night	17% 9% 2 8% 4 4 3 3 5% 6% 40%	2400
	21st to end	Night	22% 8% 2 7% 5% 4 4 3 4 7% 34%	2705
November	1st to 10th	Night	21% 9% 3 7% 4 4 4 3 5% 6% 35%	2863
	11th to 20th	Night	22% 10% 3 6% 5% 5% 4 3 4 5% 31%	2940
	21st to end	Night	23% 11% 3 6% 4 3 3 3 5% 6% 31%	2940
December	1st to 10th	Night	15% 9% 3 7% 4 3 4 4 5% 7% 39%	4720
	11th to 20th	Night	18% 13% 3 6% 4 3 3 3 4 5% 39%	5672
	21st to end	Night	20% 12% 5% 10% 4 4 4 3 4 6% 30%	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	62% 2 10% 13% 12%	4094
	11th to 20th	Day	59% 4 11% 12% 13% 1	4181
	21st to end	Day	41% 3 11% 23% 21% 1	5762
February	1st to 10th	Day	52% 3 11% 19% 13% 2	1890
	11th to 20th	Day	54% 4 9% 21% 11% 2	1851
	21st to end	Day	49% 4 10% 22% 13% 2	1573
March	1st to 10th	Day	61% 3 8% 15% 11% 2	4967
	11th to 20th	Day	59% 4 14% 15% 6% 2	5090
	21st to end	Day	61% 3 5% 19% 11% 2	5587
April	1st to 10th	Day	55% 4 8% 18% 12% 3	2485
	11th to 20th	Day	51% 4 9% 23% 12% 1	2675
	21st to end	Day	53% 4 9% 16% 14% 4	2730
May	1st to 10th	Day	60% 5% 8% 17% 9% 1	6215
	11th to 20th	Day	51% 4 14% 23% 6% 1	6462
	21st to end	Day	49% 6% 11% 23% 11%	7189
June	1st to 10th	Day	55% 4 11% 20% 9% 1	3000
	11th to 20th	Day	47% 6% 12% 23% 11% 1	3000
	21st to end	Day	55% 7% 11% 17% 9% 1	3000
July	1st to 10th	Day	48% 6% 17% 20% 8%	6745
	11th to 20th	Day	39% 6% 16% 30% 9%	6739
	21st to end	Day	38% 7% 18% 30% 7%	6652
August	1st to 10th	Day	47% 7% 14% 24% 8%	4222
	11th to 20th	Day	41% 7% 14% 27% 11%	4214
	21st to end	Day	36% 4 15% 28% 17% 1	4610
September	1st to 10th	Day	38% 6% 16% 28% 12%	2400
	11th to 20th	Day	41% 4 12% 27% 14% 1	2277
	21st to end	Day	41% 5% 9% 29% 15% 1	2168
October	1st to 10th	Day	41% 5% 14% 29% 10% 1	3260
	11th to 20th	Day	47% 3 10% 29% 10%	3240
	21st to end	Day	40% 4 18% 23% 15%	3423
November	1st to 10th	Day	52% 5% 10% 23% 10% 1	1655
	11th to 20th	Day	56% 3 12% 17% 11% 1	1680
	21st to end	Day	55% 4 14% 18% 7%	1680
December	1st to 10th	Day	52% 4 13% 23% 8%	2690
	11th to 20th	Day	54% 3 10% 19% 11% 2	2741
	21st to end	Day	55% 3 12% 20% 8% 1	3553
January	1st to 10th	Night	56% 2 11% 23% 7%	8831
	11th to 20th	Night	60% 3 10% 17% 10%	8802
	21st to end	Night	42% 3 10% 23% 18% 3	8404
February	1st to 10th	Night	53% 3 11% 17% 14% 2	2730
	11th to 20th	Night	57% 3 8% 18% 11% 1	2666
	21st to end	Night	50% 3 8% 23% 14% 3	2231
March	1st to 10th	Night	64% 3 5% 13% 13% 2	5105
	11th to 20th	Night	62% 3 10% 14% 9% 1	5090
	21st to end	Night	62% 2 4 17% 13% 2	5587
April	1st to 10th	Night	59% 3 7% 16% 11% 3	2134
	11th to 20th	Night	53% 3 8% 22% 12% 1	1893
	21st to end	Night	55% 2 9% 16% 16% 2	1890
May	1st to 10th	Night	60% 3 8% 16% 12% 1	3956
	11th to 20th	Night	51% 4 12% 24% 8% 2	3677
	21st to end	Night	49% 5% 16% 21% 9%	3993
June	1st to 10th	Night	55% 4 12% 20% 9% 1	1400
	11th to 20th	Night	46% 5% 11% 27% 9% 2	1400
	21st to end	Night	58% 4 12% 17% 9% 1	1400
July	1st to 10th	Night	48% 6% 16% 21% 10%	3125
	11th to 20th	Night	44% 5% 17% 28% 6%	3118
	21st to end	Night	37% 7% 21% 26% 9%	3839
August	1st to 10th	Night	51% 7% 13% 22% 8%	2903
	11th to 20th	Night	43% 5% 17% 26% 9%	2899
	21st to end	Night	38% 4 16% 27% 13% 2	3286
September	1st to 10th	Night	38% 5% 12% 31% 14%	2000
	11th to 20th	Night	37% 3 14% 30% 15% 1	2120
	21st to end	Night	40% 4 10% 30% 15% 1	2231
October	1st to 10th	Night	46% 4 13% 28% 9%	3920
	11th to 20th	Night	40% 3 11% 34% 11%	3899
	21st to end	Night	44% 3 14% 25% 14%	4366
November	1st to 10th	Night	52% 3 12% 22% 10% 1	2863
	11th to 20th	Night	56% 3 11% 20% 9% 1	2940
	21st to end	Night	55% 4 13% 19% 7%	2940
December	1st to 10th	Night	46% 3 14% 27% 10%	4720
	11th to 20th	Night	50% 3 10% 24% 13% 1	5673
	21st to end	Night	59% 2 11% 19% 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% 13% 32% 23% 5%	220
	11th to 20th	Day	25% 18% 27% 19% 9% 2	220
	21st to end	Day	15% 12% 38% 25% 8% 1	467
February	1st to 10th	Day	21% 11% 36% 21% 7% 3	430
	11th to 20th	Day	21% 17% 34% 20% 7% 2	426
	21st to end	Day	16% 13% 40% 23% 8% 1	364
March	1st to 10th	Day	21% 16% 39% 19% 4 1	540
	11th to 20th	Day	22% 14% 33% 23% 6% 1	540
	21st to end	Day	27% 13% 32% 21% 5% 1	594
April	1st to 10th	Day	28% 12% 35% 19% 6%	540
	11th to 20th	Day	24% 12% 32% 24% 5% 1	532
	21st to end	Day	26% 11% 28% 21% 11% 2	540
May	1st to 10th	Day	29% 8% 29% 22% 9% 1	627
	11th to 20th	Day	22% 10% 27% 26% 12% 2	774
	21st to end	Day	23% 11% 30% 25% 9% 1	845
June	1st to 10th	Day	29% 9% 27% 22% 10% 2	730
	11th to 20th	Day	21% 7% 26% 30% 15% 2	730
	21st to end	Day	25% 6% 25% 30% 12% 2	730
July	1st to 10th	Day	17% 4 29% 30% 18% 2	720
	11th to 20th	Day	15% 3 26% 34% 20% 2	718
	21st to end	Day	16% 3 24% 34% 20% 3	746
August	1st to 10th	Day	13% 3 22% 35% 21% 6%	526
	11th to 20th	Day	14% 5% 18% 35% 24% 5%	519
	21st to end	Day	15% 6% 22% 36% 15% 6%	583
September	1st to 10th	Day	16% 4 29% 32% 15% 4	530
	11th to 20th	Day	21% 7% 27% 24% 15% 5%	530
	21st to end	Day	18% 9% 28% 26% 15% 3	511
October	1st to 10th	Day	17% 9% 27% 27% 16% 3	420
	11th to 20th	Day	22% 12% 29% 22% 12% 3	420
	21st to end	Day	26% 11% 34% 21% 6% 1	462
November	1st to 10th	Day	22% 14% 35% 21% 7%	425
	11th to 20th	Day	29% 15% 31% 17% 7%	430
	21st to end	Day	26% 17% 36% 17% 3 1	430
December	1st to 10th	Day	26% 12% 36% 19% 6%	430
	11th to 20th	Day	26% 20% 35% 15% 3	260
	21st to end	Day	19% 22% 31% 19% 7% 1	242
January	1st to 10th	Night	24% 15% 33% 22% 5%	950
	11th to 20th	Night	24% 13% 34% 22% 7% 1	936
	21st to end	Night	17% 11% 39% 26% 7% 1	924
February	1st to 10th	Night	22% 11% 36% 23% 7% 1	840
	11th to 20th	Night	24% 13% 34% 22% 5% 1	823
	21st to end	Night	20% 10% 36% 26% 8%	692
March	1st to 10th	Night	24% 11% 35% 26% 3	840
	11th to 20th	Night	25% 11% 33% 23% 7% 1	840
	21st to end	Night	27% 11% 31% 24% 6% 1	924
April	1st to 10th	Night	32% 9% 27% 27% 5%	664
	11th to 20th	Night	30% 6% 30% 26% 7%	624
	21st to end	Night	28% 8% 27% 25% 11% 2	630
May	1st to 10th	Night	31% 7% 23% 28% 10% 1	630
	11th to 20th	Night	25% 6% 24% 30% 15% 1	622
	21st to end	Night	18% 9% 34% 30% 9%	664
June	1st to 10th	Night	31% 6% 22% 31% 11%	400
	11th to 20th	Night	22% 4 25% 38% 11% 1	400
	21st to end	Night	26% 5% 23% 34% 11% 1	400
July	1st to 10th	Night	17% 4 26% 36% 15% 1	390
	11th to 20th	Night	14% 3 28% 39% 15% 1	388
	21st to end	Night	17% 5% 21% 41% 15% 1	614
August	1st to 10th	Night	17% 4 21% 38% 18% 1	598
	11th to 20th	Night	17% 4 19% 38% 21% 1	592
	21st to end	Night	16% 3 25% 35% 19% 2	660
September	1st to 10th	Night	18% 6% 32% 31% 12% 1	600
	11th to 20th	Night	18% 7% 27% 32% 15% 1	720
	21st to end	Night	20% 8% 31% 29% 11% 1	800
October	1st to 10th	Night	24% 6% 32% 27% 10% 1	800
	11th to 20th	Night	22% 11% 32% 25% 10% 1	800
	21st to end	Night	26% 14% 35% 19% 6%	880
November	1st to 10th	Night	25% 14% 34% 21% 5% 1	925
	11th to 20th	Night	27% 16% 31% 19% 6% 1	950
	21st to end	Night	30% 15% 31% 20% 4	950
December	1st to 10th	Night	27% 13% 39% 17% 3 1	950
	11th to 20th	Night	27% 19% 36% 15% 4	950
	21st to end	Night	28% 15% 32% 19% 4 1	1045

Page generated at 2026-05-29 02:53:25. Version ac07

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