Kejimkujik National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kejimkujik National Park clear sky chart from 2005-11-06 to 2025-08-05.

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	21% 12% 4 9% 5% 4 4 3 5% 6% 28%	126365
	Night	21% 12% 4 10% 5% 4 4 3 4 5% 26%	121742
Transparency	Day	55% 6% 11% 17% 10% 1	129939
	Night	57% 6% 11% 17% 8% 1	126255
Seeing	Day	30% 18% 30% 16% 5% 1	17998
	Night	28% 16% 31% 20% 5%	25557

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% 21% 7% 20% 9% 4 3 2 3 4 12%	3229
	11th to 20th	Day	15% 18% 8% 25% 6% 5% 4 3 4 4 9%	3956
	21st to end	Day	16% 14% 7% 15% 9% 7% 4 3 4 4 18%	4466
February	1st to 10th	Day	21% 16% 6% 12% 8% 6% 4 3 4 5% 15%	1800
	11th to 20th	Day	16% 14% 6% 16% 11% 4 4 3 4 4 17%	1753
	21st to end	Day	12% 18% 6% 10% 6% 5% 4 3 5% 6% 25%	1557
March	1st to 10th	Day	24% 16% 5% 12% 7% 5% 3 2 3 4 19%	4881
	11th to 20th	Day	19% 17% 4 8% 4 4 3 3 4 5% 27%	4980
	21st to end	Day	28% 15% 6% 10% 5% 4 4 2 4 3 20%	5466
April	1st to 10th	Day	27% 16% 4 8% 4 3 3 3 4 3 26%	2333
	11th to 20th	Day	21% 12% 3 5% 4 3 3 3 5% 6% 34%	2514
	21st to end	Day	24% 11% 2 5% 4 4 3 3 4 6% 34%	2600
May	1st to 10th	Day	28% 14% 3 8% 5% 4 4 3 4 5% 22%	5886
	11th to 20th	Day	24% 12% 3 8% 4 4 4 3 4 5% 28%	6226
	21st to end	Day	21% 10% 3 6% 4 4 4 3 5% 7% 33%	6948
June	1st to 10th	Day	25% 10% 3 6% 4 4 4 3 5% 7% 29%	2829
	11th to 20th	Day	22% 6% 2 7% 5% 4 4 3 5% 6% 36%	3000
	21st to end	Day	26% 8% 3 7% 6% 4 4 4 5% 7% 27%	3000
July	1st to 10th	Day	24% 8% 3 6% 4 4 4 4 6% 7% 30%	6820
	11th to 20th	Day	23% 8% 3 6% 3 4 3 3 5% 8% 36%	6462
	21st to end	Day	14% 7% 2 6% 5% 4 5% 4 6% 9% 39%	6433
August	1st to 10th	Day	24% 10% 3 7% 4 4 4 4 5% 6% 29%	4157
	11th to 20th	Day	15% 7% 3 7% 6% 5% 5% 4 6% 7% 34%	4045
	21st to end	Day	12% 6% 2 6% 4 4 5% 4 6% 7% 45%	4436
September	1st to 10th	Day	18% 6% 3 5% 4 4 4 2 5% 6% 43%	2280
	11th to 20th	Day	18% 6% 2 6% 3 4 3 3 4 6% 45%	2123
	21st to end	Day	21% 7% 3 5% 3 3 3 2 5% 6% 42%	2081
October	1st to 10th	Day	19% 7% 3 6% 4 4 4 3 6% 8% 36%	1900
	11th to 20th	Day	22% 8% 3 6% 4 4 4 4 6% 6% 33%	1900
	21st to end	Day	22% 12% 4 8% 5% 4 3 3 5% 6% 30%	2076
November	1st to 10th	Day	20% 12% 4 8% 5% 4 4 3 4 6% 30%	1670
	11th to 20th	Day	22% 16% 5% 8% 5% 3 4 3 4 5% 23%	1600
	21st to end	Day	20% 17% 6% 10% 7% 5% 4 3 4 5% 20%	1600
December	1st to 10th	Day	24% 14% 8% 13% 5% 4 4 4 5% 6% 13%	2610
	11th to 20th	Day	28% 13% 4 11% 6% 5% 4 4 4 5% 18%	2996
	21st to end	Day	22% 14% 7% 12% 7% 4 3 2 5% 4 19%	3752
January	1st to 10th	Night	14% 18% 8% 22% 8% 5% 4 3 3 3 12%	6699
	11th to 20th	Night	17% 17% 7% 21% 6% 5% 5% 2 4 4 12%	5931
	21st to end	Night	13% 13% 5% 16% 12% 7% 6% 4 5% 5% 14%	6490
February	1st to 10th	Night	20% 14% 5% 12% 8% 6% 5% 5% 5% 5% 15%	2600
	11th to 20th	Night	17% 13% 4 13% 10% 6% 6% 4 5% 5% 17%	2533
	21st to end	Night	14% 13% 5% 11% 8% 5% 5% 4 5% 6% 25%	2070
March	1st to 10th	Night	25% 15% 5% 10% 8% 5% 4 2 3 3 19%	4959
	11th to 20th	Night	20% 15% 5% 9% 5% 4 4 3 4 6% 24%	4979
	21st to end	Night	30% 12% 4 9% 3 3 3 2 4 5% 25%	5466
April	1st to 10th	Night	24% 14% 3 6% 5% 4 3 3 5% 4 28%	2066
	11th to 20th	Night	24% 9% 3 6% 4 4 4 3 4 7% 31%	1833
	21st to end	Night	25% 11% 3 6% 4 4 4 3 5% 5% 32%	1800
May	1st to 10th	Night	29% 14% 4 8% 4 4 3 3 4 4 24%	4054
	11th to 20th	Night	24% 12% 3 7% 4 4 4 3 4 6% 29%	3684
	21st to end	Night	19% 13% 4 7% 4 4 4 4 4 6% 32%	3948
June	1st to 10th	Night	27% 7% 2 6% 4 4 3 3 5% 8% 32%	1586
	11th to 20th	Night	21% 8% 3 6% 4 3 3 3 5% 6% 38%	1400
	21st to end	Night	24% 9% 3 5% 5% 4 4 4 5% 6% 31%	1400
July	1st to 10th	Night	26% 10% 3 7% 3 4 4 3 5% 7% 28%	3160
	11th to 20th	Night	24% 7% 2 5% 3 4 4 3 5% 7% 35%	3454
	21st to end	Night	16% 7% 2 6% 3 4 4 4 5% 8% 42%	4417
August	1st to 10th	Night	29% 8% 2 6% 3 2 3 3 5% 6% 34%	2862
	11th to 20th	Night	19% 8% 2 6% 4 3 4 3 5% 7% 37%	2782
	21st to end	Night	11% 7% 2 5% 4 3 4 3 5% 7% 49%	3220
September	1st to 10th	Night	17% 6% 2 4 3 4 4 3 5% 7% 44%	1900
	11th to 20th	Night	19% 6% 2 5% 3 3 2 3 4 7% 45%	2053
	21st to end	Night	19% 9% 2 5% 3 3 5% 3 5% 6% 38%	2099
October	1st to 10th	Night	21% 7% 2 6% 4 3 3 3 5% 6% 40%	2280
	11th to 20th	Night	20% 8% 3 6% 3 3 4 3 5% 7% 38%	2280
	21st to end	Night	25% 10% 3 6% 3 4 3 3 5% 6% 31%	2518
November	1st to 10th	Night	20% 10% 3 6% 5% 4 4 4 5% 7% 33%	2627
	11th to 20th	Night	21% 14% 5% 8% 5% 5% 4 4 5% 6% 24%	2800
	21st to end	Night	21% 13% 5% 9% 5% 4 5% 4 5% 6% 23%	2800
December	1st to 10th	Night	17% 15% 6% 14% 6% 5% 5% 4 6% 6% 16%	4580
	11th to 20th	Night	25% 12% 4 10% 6% 5% 4 4 4 6% 22%	5213
	21st to end	Night	24% 15% 5% 11% 6% 3 3 2 3 4 23%	7199

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	75% 5% 12% 7% 1	3230
	11th to 20th	Day	76% 7% 8% 7% 2	3989
	21st to end	Day	67% 5% 9% 9% 9% 1	4466
February	1st to 10th	Day	68% 6% 13% 8% 5%	1800
	11th to 20th	Day	69% 6% 10% 11% 4	1761
	21st to end	Day	59% 5% 12% 17% 7% 2	1557
March	1st to 10th	Day	69% 4 8% 12% 6% 1	4885
	11th to 20th	Day	57% 5% 13% 18% 6% 1	4980
	21st to end	Day	69% 4 5% 12% 9% 1	5466
April	1st to 10th	Day	61% 5% 7% 13% 12% 2	2333
	11th to 20th	Day	51% 5% 9% 22% 12% 2	2514
	21st to end	Day	52% 4 10% 18% 13% 3	2600
May	1st to 10th	Day	63% 6% 10% 14% 6% 1	5897
	11th to 20th	Day	56% 7% 9% 17% 9% 2	6230
	21st to end	Day	50% 7% 13% 16% 13% 2	6948
June	1st to 10th	Day	54% 5% 10% 19% 11%	2829
	11th to 20th	Day	48% 5% 12% 18% 14% 2	3000
	21st to end	Day	56% 7% 10% 16% 10% 1	3000
July	1st to 10th	Day	52% 5% 13% 17% 11% 2	6745
	11th to 20th	Day	48% 6% 10% 23% 14%	6383
	21st to end	Day	40% 7% 15% 25% 12% 1	6249
August	1st to 10th	Day	55% 7% 10% 17% 11% 1	4144
	11th to 20th	Day	46% 7% 13% 24% 10%	4084
	21st to end	Day	34% 7% 12% 24% 21% 2	4436
September	1st to 10th	Day	41% 6% 10% 25% 16% 2	2280
	11th to 20th	Day	41% 5% 9% 24% 19% 2	2123
	21st to end	Day	44% 5% 8% 24% 17% 2	2081
October	1st to 10th	Day	44% 8% 11% 23% 13% 1	3160
	11th to 20th	Day	42% 6% 10% 22% 20%	3140
	21st to end	Day	46% 4 12% 22% 12% 3	3402
November	1st to 10th	Day	54% 5% 12% 19% 9% 1	1670
	11th to 20th	Day	61% 6% 11% 15% 6% 1	1600
	21st to end	Day	66% 6% 12% 13% 3	1600
December	1st to 10th	Day	68% 8% 10% 13% 2	2610
	11th to 20th	Day	66% 5% 11% 13% 5%	2995
	21st to end	Day	65% 6% 13% 10% 6%	3752
January	1st to 10th	Night	76% 6% 8% 9% 2	6699
	11th to 20th	Night	72% 7% 10% 8% 3	5973
	21st to end	Night	66% 7% 11% 11% 5%	6490
February	1st to 10th	Night	66% 7% 12% 9% 5% 1	2600
	11th to 20th	Night	67% 6% 10% 12% 4	2536
	21st to end	Night	57% 7% 12% 16% 7% 1	2070
March	1st to 10th	Night	69% 4 7% 12% 8% 1	4968
	11th to 20th	Night	59% 6% 13% 16% 6% 1	4980
	21st to end	Night	62% 4 7% 17% 9% 1	5466
April	1st to 10th	Night	58% 5% 9% 15% 11% 2	2066
	11th to 20th	Night	52% 5% 9% 21% 11% 1	1833
	21st to end	Night	54% 5% 9% 18% 12% 2	1800
May	1st to 10th	Night	64% 6% 7% 15% 7%	4060
	11th to 20th	Night	54% 7% 10% 21% 6% 2	3685
	21st to end	Night	51% 8% 11% 21% 8% 1	3949
June	1st to 10th	Night	51% 6% 12% 21% 10%	1586
	11th to 20th	Night	47% 6% 12% 22% 12% 1	1400
	21st to end	Night	54% 7% 11% 17% 10% 1	1400
July	1st to 10th	Night	55% 5% 12% 18% 9%	3125
	11th to 20th	Night	49% 5% 13% 18% 14% 1	3410
	21st to end	Night	40% 7% 13% 25% 14% 1	4287
August	1st to 10th	Night	53% 5% 12% 22% 8%	2850
	11th to 20th	Night	46% 7% 16% 24% 7%	2809
	21st to end	Night	32% 7% 16% 27% 18% 1	3219
September	1st to 10th	Night	39% 5% 11% 27% 15% 2	1900
	11th to 20th	Night	40% 4 8% 29% 16% 2	2053
	21st to end	Night	47% 5% 9% 22% 15% 2	2099
October	1st to 10th	Night	47% 6% 12% 21% 12% 1	3800
	11th to 20th	Night	36% 6% 13% 25% 20%	3779
	21st to end	Night	44% 5% 10% 25% 16% 1	4142
November	1st to 10th	Night	48% 8% 14% 20% 9%	2627
	11th to 20th	Night	58% 6% 12% 16% 6%	2800
	21st to end	Night	59% 7% 16% 14% 4	2800
December	1st to 10th	Night	63% 7% 13% 16% 2	4580
	11th to 20th	Night	60% 6% 13% 15% 5%	5215
	21st to end	Night	64% 5% 9% 14% 7% 1	7199

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	37% 22% 30% 8% 2	233
	11th to 20th	Day	36% 21% 27% 14% 3	400
	21st to end	Day	26% 23% 35% 12% 3	440
February	1st to 10th	Day	37% 17% 28% 15% 3	400
	11th to 20th	Day	36% 27% 25% 12% 1	396
	21st to end	Day	33% 18% 31% 14% 3	369
March	1st to 10th	Day	36% 21% 31% 8% 3	500
	11th to 20th	Day	33% 25% 26% 11% 4 1	500
	21st to end	Day	37% 25% 23% 9% 5%	550
April	1st to 10th	Day	43% 21% 25% 7% 3	500
	11th to 20th	Day	33% 25% 28% 10% 3	492
	21st to end	Day	35% 23% 24% 14% 4	500
May	1st to 10th	Day	36% 23% 29% 9% 3	503
	11th to 20th	Day	29% 20% 29% 17% 5% 1	684
	21st to end	Day	33% 16% 31% 15% 4 1	790
June	1st to 10th	Day	34% 16% 29% 17% 4	730
	11th to 20th	Day	26% 15% 33% 19% 5% 1	730
	21st to end	Day	32% 15% 28% 17% 6% 1	730
July	1st to 10th	Day	25% 14% 32% 21% 8% 1	720
	11th to 20th	Day	23% 11% 32% 23% 10% 1	718
	21st to end	Day	21% 15% 36% 22% 4 1	584
August	1st to 10th	Day	19% 12% 37% 23% 8% 1	502
	11th to 20th	Day	21% 14% 33% 20% 10% 2	479
	21st to end	Day	20% 14% 31% 22% 11% 2	539
September	1st to 10th	Day	20% 15% 33% 24% 7% 1	490
	11th to 20th	Day	24% 16% 29% 18% 8% 4	490
	21st to end	Day	24% 16% 31% 18% 9% 2	485
October	1st to 10th	Day	24% 15% 29% 20% 11% 2	390
	11th to 20th	Day	27% 16% 28% 20% 7% 2	390
	21st to end	Day	33% 19% 28% 14% 6% 1	429
November	1st to 10th	Day	28% 18% 33% 15% 5% 1	395
	11th to 20th	Day	38% 19% 25% 14% 4	400
	21st to end	Day	36% 22% 29% 10% 3 1	400
December	1st to 10th	Day	39% 20% 27% 13% 2	400
	11th to 20th	Day	43% 25% 21% 9% 2 1	400
	21st to end	Day	39% 20% 25% 11% 3 1	340
January	1st to 10th	Night	33% 19% 31% 15% 2	900
	11th to 20th	Night	32% 19% 28% 18% 3	816
	21st to end	Night	25% 23% 31% 17% 3	880
February	1st to 10th	Night	32% 19% 29% 18% 2	800
	11th to 20th	Night	31% 22% 30% 15% 2	783
	21st to end	Night	22% 20% 34% 20% 3	660
March	1st to 10th	Night	29% 21% 30% 17% 2	800
	11th to 20th	Night	27% 19% 31% 19% 5%	800
	21st to end	Night	29% 20% 31% 15% 5%	880
April	1st to 10th	Night	38% 15% 32% 13% 2	666
	11th to 20th	Night	31% 20% 33% 14% 2	594
	21st to end	Night	33% 17% 29% 18% 3	600
May	1st to 10th	Night	31% 16% 33% 17% 4	600
	11th to 20th	Night	31% 14% 33% 19% 4	592
	21st to end	Night	25% 15% 38% 18% 3	649
June	1st to 10th	Night	30% 12% 35% 19% 4	586
	11th to 20th	Night	24% 12% 35% 24% 5%	400
	21st to end	Night	31% 6% 36% 20% 8%	400
July	1st to 10th	Night	22% 7% 39% 25% 6%	390
	11th to 20th	Night	18% 8% 40% 25% 9%	511
	21st to end	Night	21% 6% 38% 30% 4	656
August	1st to 10th	Night	18% 9% 35% 30% 7%	581
	11th to 20th	Night	23% 9% 31% 28% 9% 1	562
	21st to end	Night	18% 10% 35% 28% 10% 1	627
September	1st to 10th	Night	20% 11% 35% 25% 9%	570
	11th to 20th	Night	23% 10% 28% 25% 13% 1	723
	21st to end	Night	25% 12% 29% 23% 9% 1	760
October	1st to 10th	Night	25% 10% 29% 26% 9% 1	760
	11th to 20th	Night	23% 17% 31% 20% 9% 1	760
	21st to end	Night	32% 16% 27% 21% 4	836
November	1st to 10th	Night	28% 14% 29% 22% 6% 1	825
	11th to 20th	Night	33% 17% 24% 19% 6%	900
	21st to end	Night	31% 21% 27% 16% 5%	900
December	1st to 10th	Night	35% 17% 28% 16% 3	900
	11th to 20th	Night	34% 23% 26% 14% 2	900
	21st to end	Night	34% 19% 25% 17% 3	990

Page generated at 2025-08-02 02:32:22. Version ac07

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