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 2024-11-04.

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% 11% 4 8% 5% 4 4 3 5% 6% 29%	101834
	Night	21% 11% 4 9% 5% 4 4 3 5% 6% 27%	97197
Transparency	Day	54% 6% 11% 17% 10% 1	105419
	Night	56% 6% 12% 17% 9% 1	101701
Seeing	Day	30% 18% 30% 16% 5% 1	16959
	Night	28% 16% 31% 20% 5%	24554

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	18% 16% 5% 14% 8% 6% 4 3 4 5% 17%	2251
	11th to 20th	Day	18% 15% 6% 21% 6% 6% 4 3 4 4 12%	2782
	21st to end	Day	20% 12% 7% 14% 7% 5% 4 3 4 4 19%	3124
February	1st to 10th	Day	21% 15% 6% 12% 8% 6% 4 3 5% 5% 15%	1710
	11th to 20th	Day	17% 15% 6% 15% 11% 4 4 4 4 4 17%	1663
	21st to end	Day	12% 18% 6% 9% 7% 5% 4 2 5% 6% 26%	1481
March	1st to 10th	Day	26% 16% 4 8% 6% 4 3 2 3 4 23%	3395
	11th to 20th	Day	17% 20% 4 10% 5% 5% 4 3 4 5% 23%	3480
	21st to end	Day	30% 14% 5% 10% 4 4 3 2 3 3 20%	3816
April	1st to 10th	Day	26% 16% 4 8% 4 3 3 3 4 3 26%	2216
	11th to 20th	Day	21% 12% 3 5% 4 3 3 3 5% 6% 35%	2387
	21st to end	Day	24% 11% 2 5% 4 4 3 3 4 6% 33%	2470
May	1st to 10th	Day	24% 14% 3 7% 5% 4 4 3 5% 7% 26%	4106
	11th to 20th	Day	21% 10% 3 8% 4 4 4 3 4 6% 30%	4334
	21st to end	Day	20% 8% 2 6% 4 4 3 4 5% 8% 37%	4836
June	1st to 10th	Day	25% 10% 3 6% 4 4 4 3 5% 7% 29%	2687
	11th to 20th	Day	23% 6% 2 7% 5% 4 4 3 5% 7% 35%	2850
	21st to end	Day	26% 8% 3 7% 6% 4 4 4 5% 6% 27%	2850
July	1st to 10th	Day	23% 8% 2 6% 4 4 4 4 6% 7% 32%	4760
	11th to 20th	Day	25% 7% 2 5% 3 4 4 3 5% 8% 33%	4514
	21st to end	Day	19% 8% 3 6% 5% 4 5% 4 6% 8% 32%	4475
August	1st to 10th	Day	25% 10% 3 7% 4 4 4 4 5% 6% 28%	4105
	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% 3 8% 5% 4 4 3 4 6% 30%	1612
	11th to 20th	Day	22% 15% 5% 7% 5% 3 4 3 5% 5% 24%	1520
	21st to end	Day	20% 17% 6% 10% 7% 4 4 3 4 5% 21%	1520
December	1st to 10th	Day	26% 18% 5% 11% 5% 4 4 3 4 5% 15%	1520
	11th to 20th	Day	28% 14% 5% 11% 7% 5% 4 4 4 5% 13%	1906
	21st to end	Day	22% 13% 9% 13% 8% 5% 3 2 5% 4 15%	2623
January	1st to 10th	Night	16% 13% 6% 19% 8% 6% 5% 4 4 4 16%	4681
	11th to 20th	Night	19% 18% 6% 17% 7% 4 4 3 4 5% 14%	4179
	21st to end	Night	19% 13% 5% 13% 8% 6% 6% 5% 5% 5% 15%	4532
February	1st to 10th	Night	20% 14% 5% 12% 8% 6% 5% 5% 5% 5% 15%	2470
	11th to 20th	Night	18% 13% 4 12% 10% 7% 6% 4 5% 5% 17%	2403
	21st to end	Night	14% 14% 5% 11% 8% 5% 5% 4 5% 5% 24%	1970
March	1st to 10th	Night	24% 13% 4 9% 7% 5% 4 2 4 4 24%	3445
	11th to 20th	Night	17% 18% 5% 9% 6% 5% 5% 3 4 6% 20%	3479
	21st to end	Night	32% 10% 4 10% 4 3 3 2 3 4 25%	3816
April	1st to 10th	Night	24% 14% 3 6% 5% 4 3 4 5% 5% 28%	1963
	11th to 20th	Night	24% 9% 3 6% 4 4 4 3 4 7% 32%	1740
	21st to end	Night	25% 11% 3 6% 3 4 4 3 5% 5% 32%	1710
May	1st to 10th	Night	20% 15% 4 9% 4 4 4 3 4 5% 27%	2834
	11th to 20th	Night	23% 10% 3 8% 5% 4 5% 4 5% 7% 28%	2568
	21st to end	Night	18% 10% 4 7% 4 4 5% 4 5% 7% 31%	2749
June	1st to 10th	Night	28% 7% 2 6% 4 4 4 3 5% 7% 32%	1507
	11th to 20th	Night	21% 8% 3 6% 4 3 3 3 5% 6% 37%	1330
	21st to end	Night	24% 9% 3 5% 5% 4 4 4 5% 6% 30%	1330
July	1st to 10th	Night	24% 10% 3 7% 4 4 4 4 5% 8% 28%	2210
	11th to 20th	Night	25% 8% 2 5% 4 4 4 4 5% 8% 32%	2420
	21st to end	Night	17% 8% 2 7% 4 4 4 4 5% 7% 38%	3076
August	1st to 10th	Night	29% 8% 3 6% 3 2 3 3 5% 6% 33%	2825
	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	21% 10% 3 6% 5% 4 4 4 5% 7% 32%	2538
	11th to 20th	Night	21% 12% 5% 9% 5% 5% 4 4 5% 6% 25%	2660
	21st to end	Night	20% 12% 5% 10% 5% 5% 5% 4 5% 6% 23%	2660
December	1st to 10th	Night	25% 17% 5% 9% 6% 5% 4 3 5% 6% 16%	2660
	11th to 20th	Night	29% 12% 5% 11% 7% 5% 3 4 4 6% 16%	3293
	21st to end	Night	24% 14% 6% 13% 5% 4 3 3 4 4 20%	5017

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	67% 6% 17% 9% 2	2252
	11th to 20th	Day	72% 7% 10% 8% 2	2782
	21st to end	Day	67% 5% 11% 12% 6%	3124
February	1st to 10th	Day	68% 6% 13% 8% 5%	1710
	11th to 20th	Day	69% 6% 10% 11% 4	1671
	21st to end	Day	58% 5% 12% 17% 7% 2	1481
March	1st to 10th	Day	65% 4 9% 15% 6% 2	3399
	11th to 20th	Day	61% 6% 11% 15% 7% 1	3480
	21st to end	Day	70% 4 6% 12% 8% 1	3816
April	1st to 10th	Day	61% 5% 7% 14% 12% 2	2216
	11th to 20th	Day	50% 5% 10% 22% 12% 1	2387
	21st to end	Day	53% 4 10% 17% 14% 3	2470
May	1st to 10th	Day	57% 7% 12% 17% 7% 1	4120
	11th to 20th	Day	52% 9% 11% 19% 8% 1	4338
	21st to end	Day	44% 8% 16% 17% 15% 1	4836
June	1st to 10th	Day	55% 6% 10% 19% 11%	2687
	11th to 20th	Day	49% 5% 12% 18% 14% 2	2850
	21st to end	Day	57% 7% 10% 15% 10% 1	2850
July	1st to 10th	Day	50% 6% 12% 18% 12% 3	4685
	11th to 20th	Day	49% 6% 11% 22% 11% 1	4435
	21st to end	Day	48% 7% 13% 21% 10% 1	4332
August	1st to 10th	Day	55% 7% 10% 17% 10% 1	4092
	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% 6% 11% 19% 9% 1	1612
	11th to 20th	Day	60% 6% 12% 16% 5% 1	1520
	21st to end	Day	64% 5% 13% 14% 3	1520
December	1st to 10th	Day	70% 6% 10% 12% 3	1520
	11th to 20th	Day	71% 6% 11% 9% 3	1905
	21st to end	Day	68% 7% 15% 7% 3	2623
January	1st to 10th	Night	68% 8% 11% 12% 2	4681
	11th to 20th	Night	71% 7% 10% 8% 3	4179
	21st to end	Night	66% 6% 12% 11% 4	4532
February	1st to 10th	Night	66% 7% 12% 10% 5% 1	2470
	11th to 20th	Night	66% 6% 10% 12% 5%	2406
	21st to end	Night	57% 7% 12% 16% 7% 1	1970
March	1st to 10th	Night	63% 5% 9% 15% 8% 1	3454
	11th to 20th	Night	62% 7% 11% 13% 7% 1	3480
	21st to end	Night	64% 4 9% 13% 8% 1	3816
April	1st to 10th	Night	58% 5% 9% 15% 11% 2	1963
	11th to 20th	Night	52% 5% 9% 20% 12% 1	1740
	21st to end	Night	53% 5% 9% 17% 13% 2	1710
May	1st to 10th	Night	58% 7% 9% 18% 7%	2840
	11th to 20th	Night	53% 9% 12% 20% 6%	2569
	21st to end	Night	49% 10% 13% 21% 6%	2750
June	1st to 10th	Night	52% 6% 13% 20% 9%	1507
	11th to 20th	Night	48% 6% 13% 21% 11% 1	1330
	21st to end	Night	55% 7% 12% 16% 9% 1	1330
July	1st to 10th	Night	55% 6% 11% 17% 11%	2175
	11th to 20th	Night	52% 6% 14% 18% 10%	2376
	21st to end	Night	45% 7% 12% 23% 12% 1	2979
August	1st to 10th	Night	54% 5% 12% 22% 8%	2813
	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	50% 8% 14% 19% 9%	2538
	11th to 20th	Night	57% 7% 13% 17% 6%	2660
	21st to end	Night	58% 7% 16% 14% 5%	2660
December	1st to 10th	Night	67% 5% 13% 12% 3	2660
	11th to 20th	Night	67% 6% 10% 13% 3	3295
	21st to end	Night	65% 6% 11% 14% 3	5017

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% 31% 8% 2	211
	11th to 20th	Day	36% 22% 27% 13% 3	370
	21st to end	Day	26% 22% 36% 13% 3	407
February	1st to 10th	Day	36% 17% 28% 16% 3	370
	11th to 20th	Day	36% 27% 24% 12% 1	366
	21st to end	Day	33% 18% 31% 15% 3	341
March	1st to 10th	Day	35% 22% 31% 9% 3	460
	11th to 20th	Day	34% 26% 25% 11% 4 1	460
	21st to end	Day	37% 24% 24% 10% 5%	506
April	1st to 10th	Day	42% 21% 26% 8% 3	460
	11th to 20th	Day	33% 25% 28% 11% 3	452
	21st to end	Day	35% 21% 24% 15% 5%	460
May	1st to 10th	Day	35% 24% 28% 9% 3	463
	11th to 20th	Day	27% 20% 30% 17% 5%	636
	21st to end	Day	33% 16% 31% 16% 4 1	735
June	1st to 10th	Day	34% 16% 29% 17% 3	680
	11th to 20th	Day	26% 14% 33% 20% 5% 1	680
	21st to end	Day	33% 14% 29% 17% 6% 1	680
July	1st to 10th	Day	25% 14% 31% 21% 8% 1	670
	11th to 20th	Day	23% 11% 33% 23% 9% 1	668
	21st to end	Day	22% 15% 35% 22% 4 1	540
August	1st to 10th	Day	19% 13% 36% 23% 8% 1	486
	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% 32% 16% 5% 1	374
	11th to 20th	Day	37% 18% 25% 15% 4	370
	21st to end	Day	34% 22% 30% 9% 3 1	370
December	1st to 10th	Day	39% 20% 26% 14% 2	370
	11th to 20th	Day	42% 26% 21% 9% 2	370
	21st to end	Day	39% 21% 25% 11% 4 1	312
January	1st to 10th	Night	32% 18% 32% 16% 2	850
	11th to 20th	Night	33% 19% 28% 17% 2	775
	21st to end	Night	26% 22% 31% 18% 3	836
February	1st to 10th	Night	31% 19% 30% 18% 2	760
	11th to 20th	Night	30% 22% 31% 15% 2	743
	21st to end	Night	22% 20% 34% 20% 4	628
March	1st to 10th	Night	28% 21% 31% 18% 2	760
	11th to 20th	Night	27% 19% 30% 19% 5%	760
	21st to end	Night	28% 20% 31% 15% 5%	836
April	1st to 10th	Night	37% 15% 33% 13% 2	633
	11th to 20th	Night	30% 20% 33% 14% 2	564
	21st to end	Night	32% 17% 29% 18% 4	570
May	1st to 10th	Night	29% 16% 33% 17% 5%	570
	11th to 20th	Night	30% 13% 34% 19% 4	562
	21st to end	Night	25% 15% 38% 19% 3	616
June	1st to 10th	Night	30% 13% 35% 18% 4	557
	11th to 20th	Night	24% 12% 35% 24% 5%	380
	21st to end	Night	31% 6% 36% 19% 7%	380
July	1st to 10th	Night	22% 7% 39% 26% 6%	370
	11th to 20th	Night	18% 8% 41% 24% 9%	485
	21st to end	Night	22% 6% 38% 30% 4	623
August	1st to 10th	Night	18% 9% 36% 30% 7%	568
	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% 28% 23% 6% 1	795
	11th to 20th	Night	31% 18% 25% 20% 6%	850
	21st to end	Night	29% 21% 27% 17% 5%	850
December	1st to 10th	Night	36% 17% 28% 16% 3	850
	11th to 20th	Night	35% 23% 26% 13% 3	850
	21st to end	Night	35% 20% 25% 17% 3	935

Page generated at 2024-11-01 23:47:34. Version ac07

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