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 2025-02-06.

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% 5% 4 5% 7% 33%	108294
	Night	18% 11% 3 7% 5% 4 4 3 5% 6% 34%	110053
Transparency	Day	50% 5% 12% 22% 11% 1	111858
	Night	51% 4 12% 22% 10% 1	114654
Seeing	Day	22% 11% 31% 24% 10% 2	16936
	Night	24% 10% 31% 25% 8% 1	24695

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% 10% 5% 5% 5% 4 5% 5% 23%	3157
	11th to 20th	Day	12% 14% 7% 11% 6% 5% 4 3 3 6% 30%	3192
	21st to end	Day	7% 9% 3 7% 6% 4 4 4 6% 7% 43%	4447
February	1st to 10th	Day	14% 11% 4 9% 5% 5% 4 4 6% 6% 33%	1755
	11th to 20th	Day	14% 13% 4 8% 6% 5% 5% 3 6% 6% 29%	1663
	21st to end	Day	12% 12% 4 8% 6% 5% 4 4 5% 6% 34%	1427
March	1st to 10th	Day	20% 13% 5% 9% 4 4 5% 3 4 6% 27%	3383
	11th to 20th	Day	16% 17% 4 11% 6% 6% 5% 4 4 5% 21%	3480
	21st to end	Day	26% 14% 4 7% 4 4 4 3 4 6% 24%	3816
April	1st to 10th	Day	19% 12% 4 7% 6% 4 4 3 6% 7% 28%	2248
	11th to 20th	Day	21% 9% 3 5% 4 4 5% 3 5% 7% 35%	2417
	21st to end	Day	23% 10% 3 7% 4 4 3 4 4 6% 30%	2470
May	1st to 10th	Day	23% 13% 3 7% 5% 4 5% 4 5% 6% 24%	4234
	11th to 20th	Day	17% 9% 3 7% 4 4 4 3 5% 8% 37%	4398
	21st to end	Day	17% 9% 3 9% 5% 6% 5% 5% 7% 8% 27%	4893
June	1st to 10th	Day	25% 10% 3 6% 5% 4 4 4 5% 7% 27%	2850
	11th to 20th	Day	19% 7% 3 5% 5% 5% 5% 4 5% 8% 34%	2850
	21st to end	Day	25% 9% 3 7% 5% 4 4 4 5% 6% 27%	2850
July	1st to 10th	Day	13% 7% 3 8% 5% 5% 6% 5% 7% 8% 32%	4760
	11th to 20th	Day	13% 7% 2 7% 5% 6% 5% 4 7% 8% 34%	4760
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 6% 9% 39%	4764
August	1st to 10th	Day	16% 7% 3 8% 6% 5% 6% 4 6% 8% 32%	4105
	11th to 20th	Day	12% 6% 2 6% 6% 5% 6% 5% 8% 7% 37%	4045
	21st to end	Day	15% 5% 2 5% 3 3 3 3 5% 8% 46%	4469
September	1st to 10th	Day	15% 5% 2 5% 4 5% 5% 3 6% 8% 43%	2280
	11th to 20th	Day	16% 6% 2 7% 4 4 4 3 5% 5% 44%	2163
	21st to end	Day	18% 6% 2 5% 4 5% 3 3 4 6% 42%	2060
October	1st to 10th	Day	16% 7% 2 6% 5% 4 4 4 5% 7% 41%	1900
	11th to 20th	Day	17% 9% 3 8% 4 3 5% 4 5% 6% 36%	1900
	21st to end	Day	22% 7% 2 6% 5% 4 4 4 6% 6% 34%	2028
November	1st to 10th	Day	19% 9% 2 7% 5% 5% 5% 4 5% 7% 32%	1575
	11th to 20th	Day	21% 11% 4 7% 4 4 5% 4 4 7% 31%	1600
	21st to end	Day	18% 14% 4 7% 4 4 4 4 4 5% 31%	1600
December	1st to 10th	Day	19% 10% 3 7% 3 4 4 4 5% 7% 33%	2610
	11th to 20th	Day	19% 12% 4 9% 4 4 3 3 3 5% 34%	2669
	21st to end	Day	15% 11% 5% 10% 6% 4 4 3 4 4 33%	3476
January	1st to 10th	Night	15% 17% 4 9% 5% 4 4 3 5% 6% 29%	6808
	11th to 20th	Night	15% 14% 6% 10% 5% 4 4 3 4 5% 30%	6707
	21st to end	Night	8% 10% 4 7% 6% 3 3 3 5% 7% 44%	6494
February	1st to 10th	Night	15% 11% 4 8% 5% 5% 5% 4 5% 6% 32%	2536
	11th to 20th	Night	16% 15% 4 9% 5% 5% 4 3 5% 5% 29%	2403
	21st to end	Night	14% 14% 3 7% 5% 4 5% 3 5% 6% 34%	2025
March	1st to 10th	Night	22% 13% 4 10% 5% 5% 4 3 4 4 26%	3456
	11th to 20th	Night	26% 16% 4 8% 5% 5% 4 3 5% 4 21%	3479
	21st to end	Night	29% 11% 4 8% 4 4 3 3 5% 5% 25%	3816
April	1st to 10th	Night	24% 13% 3 7% 5% 4 3 3 5% 4 29%	1931
	11th to 20th	Night	22% 10% 2 5% 4 4 4 3 4 7% 33%	1711
	21st to end	Night	22% 12% 3 7% 4 4 3 3 5% 5% 32%	1710
May	1st to 10th	Night	27% 11% 3 7% 4 4 4 4 5% 6% 26%	2696
	11th to 20th	Night	17% 7% 3 7% 3 4 4 4 6% 8% 38%	2506
	21st to end	Night	15% 9% 3 9% 6% 6% 5% 4 6% 7% 30%	2720
June	1st to 10th	Night	26% 10% 4 7% 4 3 4 3 6% 4 30%	1330
	11th to 20th	Night	19% 8% 3 5% 4 4 4 5% 5% 7% 37%	1330
	21st to end	Night	26% 8% 2 8% 6% 4 4 4 5% 7% 26%	1330
July	1st to 10th	Night	12% 7% 3 7% 5% 5% 5% 5% 7% 9% 35%	2210
	11th to 20th	Night	16% 7% 2 7% 5% 6% 5% 4 6% 7% 34%	2210
	21st to end	Night	11% 6% 3 6% 4 5% 4 4 5% 8% 44%	2760
August	1st to 10th	Night	17% 7% 2 8% 6% 6% 6% 5% 7% 8% 29%	2825
	11th to 20th	Night	11% 7% 2 9% 6% 5% 5% 4 6% 8% 38%	2782
	21st to end	Night	15% 4 2 5% 4 4 4 3 6% 6% 46%	3186
September	1st to 10th	Night	16% 6% 2 6% 3 3 3 3 5% 9% 44%	1900
	11th to 20th	Night	15% 6% 2 5% 4 3 3 3 5% 7% 47%	2014
	21st to end	Night	17% 6% 2 5% 3 4 4 3 5% 7% 45%	2119
October	1st to 10th	Night	19% 7% 3 5% 4 4 4 3 5% 6% 40%	2280
	11th to 20th	Night	17% 8% 2 8% 4 4 3 3 5% 6% 41%	2280
	21st to end	Night	22% 8% 2 7% 4 4 4 3 4 6% 35%	2570
November	1st to 10th	Night	21% 8% 3 6% 4 4 4 3 5% 6% 35%	2723
	11th to 20th	Night	22% 11% 3 7% 5% 5% 4 3 4 5% 31%	2800
	21st to end	Night	23% 12% 3 6% 4 3 3 3 5% 6% 31%	2800
December	1st to 10th	Night	15% 9% 3 7% 4 3 4 4 5% 7% 40%	4580
	11th to 20th	Night	18% 13% 3 6% 3 3 3 3 4 5% 40%	5524
	21st to end	Night	20% 13% 5% 10% 4 4 4 3 4 6% 30%	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	64% 3 11% 13% 8%	3158
	11th to 20th	Day	56% 4 12% 14% 13% 1	3218
	21st to end	Day	41% 3 11% 22% 20% 2	4447
February	1st to 10th	Day	51% 3 11% 20% 13% 2	1755
	11th to 20th	Day	55% 4 9% 20% 10% 2	1671
	21st to end	Day	50% 4 10% 21% 13% 3	1427
March	1st to 10th	Day	59% 3 10% 19% 7% 2	3387
	11th to 20th	Day	64% 4 9% 15% 6% 2	3480
	21st to end	Day	62% 4 5% 17% 10% 2	3816
April	1st to 10th	Day	55% 4 8% 18% 12% 3	2248
	11th to 20th	Day	50% 4 9% 23% 12% 1	2417
	21st to end	Day	54% 4 9% 16% 13% 4	2470
May	1st to 10th	Day	58% 5% 9% 20% 7% 1	4248
	11th to 20th	Day	47% 3 16% 25% 8% 1	4402
	21st to end	Day	51% 7% 12% 21% 10%	4893
June	1st to 10th	Day	56% 4 12% 20% 8%	2850
	11th to 20th	Day	48% 5% 13% 23% 10% 1	2850
	21st to end	Day	55% 7% 11% 18% 8% 1	2850
July	1st to 10th	Day	46% 6% 18% 19% 10%	4685
	11th to 20th	Day	44% 6% 15% 27% 8%	4679
	21st to end	Day	39% 8% 19% 26% 8%	4612
August	1st to 10th	Day	48% 7% 14% 23% 8%	4092
	11th to 20th	Day	42% 7% 14% 26% 11%	4084
	21st to end	Day	36% 4 15% 28% 17% 1	4469
September	1st to 10th	Day	39% 6% 16% 27% 13%	2280
	11th to 20th	Day	42% 4 12% 27% 14% 1	2163
	21st to end	Day	43% 5% 10% 28% 14% 1	2060
October	1st to 10th	Day	42% 5% 14% 28% 10% 1	3160
	11th to 20th	Day	47% 3 10% 29% 11%	3140
	21st to end	Day	39% 4 18% 23% 16%	3317
November	1st to 10th	Day	52% 5% 10% 22% 10% 1	1575
	11th to 20th	Day	56% 3 12% 17% 11% 1	1600
	21st to end	Day	56% 5% 14% 18% 7%	1600
December	1st to 10th	Day	52% 4 13% 23% 8%	2610
	11th to 20th	Day	55% 3 10% 19% 11% 2	2669
	21st to end	Day	55% 4 12% 20% 8% 1	3476
January	1st to 10th	Night	57% 2 13% 21% 5%	6808
	11th to 20th	Night	57% 4 11% 18% 10% 1	6756
	21st to end	Night	42% 2 10% 25% 17% 3	6494
February	1st to 10th	Night	53% 3 11% 17% 13% 3	2536
	11th to 20th	Night	58% 3 8% 18% 12% 2	2406
	21st to end	Night	51% 3 8% 22% 13% 3	2025
March	1st to 10th	Night	63% 3 6% 17% 8% 2	3465
	11th to 20th	Night	67% 3 7% 14% 9% 1	3480
	21st to end	Night	63% 3 4 18% 10% 2	3816
April	1st to 10th	Night	58% 3 8% 17% 12% 3	1931
	11th to 20th	Night	52% 4 8% 22% 13% 2	1711
	21st to end	Night	54% 2 9% 16% 16% 2	1710
May	1st to 10th	Night	58% 3 12% 17% 9% 1	2702
	11th to 20th	Night	44% 4 16% 28% 7% 1	2507
	21st to end	Night	52% 5% 16% 20% 8%	2721
June	1st to 10th	Night	56% 4 12% 19% 9% 1	1330
	11th to 20th	Night	46% 5% 11% 27% 9% 2	1330
	21st to end	Night	58% 4 12% 17% 8% 1	1330
July	1st to 10th	Night	44% 5% 19% 21% 11%	2175
	11th to 20th	Night	47% 5% 16% 25% 7%	2168
	21st to end	Night	37% 7% 21% 24% 10%	2673
August	1st to 10th	Night	52% 8% 13% 21% 7%	2813
	11th to 20th	Night	43% 5% 18% 25% 8%	2809
	21st to end	Night	38% 4 16% 27% 13% 2	3185
September	1st to 10th	Night	39% 5% 12% 30% 14%	1900
	11th to 20th	Night	38% 3 14% 29% 15% 1	2014
	21st to end	Night	40% 4 11% 31% 14% 1	2119
October	1st to 10th	Night	47% 4 13% 27% 8%	3800
	11th to 20th	Night	39% 3 11% 34% 11%	3779
	21st to end	Night	44% 3 14% 25% 14%	4231
November	1st to 10th	Night	52% 3 12% 22% 10% 1	2723
	11th to 20th	Night	56% 3 12% 19% 10% 1	2800
	21st to end	Night	56% 4 13% 19% 7%	2800
December	1st to 10th	Night	46% 3 14% 27% 10%	4580
	11th to 20th	Night	50% 2 10% 24% 13% 1	5525
	21st to end	Night	59% 2 12% 19% 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	30% 13% 32% 22% 4	200
	11th to 20th	Day	25% 17% 28% 19% 10% 3	200
	21st to end	Day	15% 13% 38% 26% 7% 1	434
February	1st to 10th	Day	23% 12% 37% 21% 5% 2	385
	11th to 20th	Day	20% 18% 38% 18% 5% 1	366
	21st to end	Day	17% 14% 41% 21% 7%	314
March	1st to 10th	Day	22% 18% 37% 18% 3 2	460
	11th to 20th	Day	22% 15% 32% 22% 8% 1	460
	21st to end	Day	28% 15% 32% 19% 5% 1	506
April	1st to 10th	Day	28% 14% 36% 15% 6%	460
	11th to 20th	Day	25% 13% 35% 21% 5% 1	452
	21st to end	Day	28% 13% 30% 19% 9% 2	460
May	1st to 10th	Day	29% 9% 32% 20% 9% 1	539
	11th to 20th	Day	22% 10% 28% 24% 12% 3	674
	21st to end	Day	22% 12% 32% 25% 7% 1	735
June	1st to 10th	Day	30% 9% 28% 22% 9% 2	680
	11th to 20th	Day	22% 8% 26% 28% 14% 2	680
	21st to end	Day	26% 6% 26% 29% 12% 2	680
July	1st to 10th	Day	17% 4 30% 29% 17% 2	670
	11th to 20th	Day	16% 3 28% 34% 18% 2	668
	21st to end	Day	16% 4 24% 34% 18% 4	694
August	1st to 10th	Day	15% 3 23% 35% 19% 4	486
	11th to 20th	Day	15% 5% 19% 36% 22% 3	479
	21st to end	Day	16% 6% 23% 35% 15% 6%	539
September	1st to 10th	Day	17% 4 31% 32% 14% 3	490
	11th to 20th	Day	22% 8% 28% 24% 14% 5%	490
	21st to end	Day	19% 10% 29% 25% 14% 4	473
October	1st to 10th	Day	18% 9% 29% 26% 15% 3	390
	11th to 20th	Day	21% 13% 31% 22% 11% 2	390
	21st to end	Day	26% 12% 35% 20% 6% 1	429
November	1st to 10th	Day	22% 14% 35% 21% 7% 1	395
	11th to 20th	Day	29% 16% 33% 16% 6% 1	400
	21st to end	Day	27% 18% 36% 17% 2 1	400
December	1st to 10th	Day	27% 12% 35% 19% 7%	400
	11th to 20th	Day	27% 21% 33% 15% 3	238
	21st to end	Day	20% 24% 29% 19% 6% 1	220
January	1st to 10th	Night	25% 15% 33% 22% 5%	900
	11th to 20th	Night	23% 13% 34% 21% 7% 1	887
	21st to end	Night	18% 11% 38% 26% 6% 1	880
February	1st to 10th	Night	23% 12% 37% 22% 6% 1	781
	11th to 20th	Night	24% 14% 37% 20% 4 1	743
	21st to end	Night	20% 11% 36% 25% 7%	628
March	1st to 10th	Night	24% 12% 35% 26% 3	760
	11th to 20th	Night	25% 12% 33% 22% 8% 1	760
	21st to end	Night	27% 12% 30% 23% 7% 1	836
April	1st to 10th	Night	32% 10% 26% 27% 5%	601
	11th to 20th	Night	28% 7% 32% 24% 8%	564
	21st to end	Night	28% 8% 29% 24% 10% 1	570
May	1st to 10th	Night	31% 7% 23% 27% 11% 1	570
	11th to 20th	Night	25% 6% 25% 28% 15% 1	562
	21st to end	Night	17% 9% 35% 30% 8%	600
June	1st to 10th	Night	31% 6% 23% 31% 10%	380
	11th to 20th	Night	23% 4 26% 36% 11% 1	380
	21st to end	Night	26% 6% 22% 34% 11% 1	380
July	1st to 10th	Night	17% 4 28% 36% 14% 1	370
	11th to 20th	Night	14% 3 30% 38% 14% 1	368
	21st to end	Night	17% 5% 21% 40% 15% 1	583
August	1st to 10th	Night	17% 4 22% 38% 17% 1	568
	11th to 20th	Night	17% 5% 20% 38% 20% 1	562
	21st to end	Night	16% 3 25% 35% 19% 2	627
September	1st to 10th	Night	18% 6% 33% 30% 11% 1	570
	11th to 20th	Night	18% 7% 27% 32% 14% 1	684
	21st to end	Night	20% 8% 31% 29% 11% 1	760
October	1st to 10th	Night	25% 6% 32% 27% 9% 1	760
	11th to 20th	Night	22% 11% 33% 25% 9% 1	760
	21st to end	Night	26% 14% 36% 19% 6%	836
November	1st to 10th	Night	25% 14% 33% 22% 5% 1	875
	11th to 20th	Night	27% 16% 32% 18% 6% 1	900
	21st to end	Night	31% 16% 31% 20% 3	900
December	1st to 10th	Night	28% 13% 39% 16% 4 1	900
	11th to 20th	Night	27% 19% 35% 14% 4	900
	21st to end	Night	29% 15% 31% 19% 4 1	990

Page generated at 2025-02-03 04:05:54. Version ac07

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