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 2024-03-23.

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% 10% 4 7% 6% 3 4 4 5% 6% 29%	78870
	Night	21% 11% 4 8% 6% 3 5% 4 5% 6% 27%	80982
Transparency	Day	55% 6% 11% 17% 10% 1	78576
	Night	57% 6% 12% 17% 8% 1	80811
Seeing	Day	30% 18% 29% 16% 5% 1	16021
	Night	28% 16% 31% 20% 5%	23843

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	19% 14% 6% 12% 10% 4 5% 3 4 5% 17%	2251
	11th to 20th	Day	19% 15% 7% 19% 8% 4 5% 3 4 4 12%	2782
	21st to end	Day	20% 12% 7% 13% 8% 4 5% 3 4 5% 20%	3124
February	1st to 10th	Day	21% 15% 6% 11% 9% 4 5% 4 5% 5% 15%	1710
	11th to 20th	Day	17% 14% 6% 14% 12% 3 6% 4 4 4 17%	1663
	21st to end	Day	13% 16% 7% 9% 7% 4 4 3 5% 6% 26%	1481
March	1st to 10th	Day	17% 16% 6% 10% 8% 4 4 3 3 4 24%	2062
	11th to 20th	Day	18% 12% 6% 9% 7% 4 4 4 4 5% 28%	2090
	21st to end	Day	19% 14% 5% 8% 6% 3 4 3 4 5% 30%	2200
April	1st to 10th	Day	27% 15% 4 7% 4 2 4 4 4 4 25%	2099
	11th to 20th	Day	21% 10% 4 5% 4 2 3 4 5% 6% 35%	2259
	21st to end	Day	25% 11% 3 5% 4 3 4 4 3 6% 32%	2340
May	1st to 10th	Day	26% 11% 3 6% 5% 3 4 4 5% 6% 27%	2340
	11th to 20th	Day	23% 7% 3 5% 4 3 4 4 4 6% 36%	2442
	21st to end	Day	24% 8% 3 5% 4 3 4 5% 5% 6% 33%	2724
June	1st to 10th	Day	27% 9% 3 5% 4 3 4 3 5% 7% 29%	2545
	11th to 20th	Day	24% 6% 3 6% 6% 3 4 4 5% 6% 35%	2700
	21st to end	Day	26% 7% 4 6% 7% 3 5% 4 4 6% 28%	2700
July	1st to 10th	Day	20% 6% 3 5% 4 3 4 4 5% 7% 37%	2700
	11th to 20th	Day	20% 6% 3 5% 5% 3 5% 5% 5% 9% 34%	2566
	21st to end	Day	22% 8% 3 5% 6% 3 5% 5% 5% 8% 31%	2556
August	1st to 10th	Day	18% 6% 3 5% 4 4 5% 6% 7% 7% 35%	2327
	11th to 20th	Day	17% 7% 3 5% 6% 3 5% 5% 5% 7% 34%	2304
	21st to end	Day	17% 6% 3 4 4 3 4 5% 5% 6% 43%	2520
September	1st to 10th	Day	17% 6% 3 5% 4 3 4 3 5% 7% 44%	2160
	11th to 20th	Day	19% 6% 2 5% 4 3 3 4 4 6% 44%	2012
	21st to end	Day	21% 7% 3 4 4 3 2 3 4 6% 43%	1972
October	1st to 10th	Day	19% 7% 3 5% 5% 3 3 4 5% 9% 37%	1800
	11th to 20th	Day	23% 8% 3 5% 5% 3 4 4 6% 7% 32%	1800
	21st to end	Day	24% 11% 4 7% 6% 3 3 4 4 5% 29%	1967
November	1st to 10th	Day	21% 11% 4 7% 6% 3 4 4 4 6% 30%	1585
	11th to 20th	Day	23% 14% 6% 7% 6% 3 4 4 5% 5% 24%	1520
	21st to end	Day	20% 16% 6% 9% 8% 3 4 4 4 6% 21%	1520
December	1st to 10th	Day	27% 16% 6% 10% 5% 3 4 4 4 5% 15%	1520
	11th to 20th	Day	28% 13% 5% 11% 7% 4 5% 5% 4 5% 13%	1906
	21st to end	Day	22% 12% 10% 11% 10% 4 4 3 5% 4 15%	2623
January	1st to 10th	Night	16% 12% 6% 16% 10% 4 5% 5% 4 4 16%	4681
	11th to 20th	Night	20% 17% 6% 16% 8% 4 4 4 4 5% 14%	4179
	21st to end	Night	19% 13% 5% 10% 10% 5% 6% 6% 5% 6% 15%	4532
February	1st to 10th	Night	20% 14% 5% 10% 9% 5% 5% 6% 5% 5% 15%	2470
	11th to 20th	Night	18% 13% 4 10% 11% 6% 6% 5% 5% 5% 17%	2403
	21st to end	Night	14% 12% 6% 10% 9% 4 6% 5% 5% 6% 25%	1970
March	1st to 10th	Night	17% 12% 5% 9% 8% 4 5% 4 5% 5% 26%	2105
	11th to 20th	Night	19% 11% 5% 8% 8% 3 6% 4 4 6% 26%	2089
	21st to end	Night	19% 10% 4 8% 6% 3 5% 4 5% 6% 32%	2201
April	1st to 10th	Night	25% 13% 4 6% 5% 3 3 4 5% 5% 27%	1860
	11th to 20th	Night	23% 8% 3 6% 5% 3 4 4 4 7% 32%	1648
	21st to end	Night	26% 11% 3 5% 4 2 5% 3 5% 6% 31%	1620
May	1st to 10th	Night	23% 10% 3 6% 4 3 4 4 5% 6% 31%	1620
	11th to 20th	Night	25% 8% 2 5% 5% 3 4 4 5% 7% 33%	1452
	21st to end	Night	20% 8% 4 6% 5% 2 5% 5% 5% 7% 33%	1550
June	1st to 10th	Night	28% 6% 3 5% 5% 3 4 3 5% 7% 32%	1428
	11th to 20th	Night	22% 7% 3 5% 5% 3 4 3 5% 6% 37%	1260
	21st to end	Night	24% 9% 3 5% 6% 3 5% 4 4 7% 31%	1260
July	1st to 10th	Night	20% 6% 3 5% 4 2 4 4 5% 11% 35%	1260
	11th to 20th	Night	17% 7% 3 5% 6% 4 5% 6% 6% 8% 33%	1372
	21st to end	Night	19% 8% 3 5% 5% 3 5% 5% 5% 8% 35%	1759
August	1st to 10th	Night	15% 8% 3 6% 4 1 4 5% 7% 7% 41%	1612
	11th to 20th	Night	20% 8% 3 5% 5% 2 4 5% 5% 7% 37%	1596
	21st to end	Night	17% 6% 3 4 5% 2 4 4 5% 6% 43%	1836
September	1st to 10th	Night	17% 6% 3 4 4 3 4 4 5% 7% 44%	1800
	11th to 20th	Night	19% 7% 2 5% 4 2 2 3 4 7% 45%	1944
	21st to end	Night	20% 8% 3 4 4 2 4 4 5% 7% 39%	1988
October	1st to 10th	Night	21% 6% 2 5% 5% 2 4 4 4 7% 40%	2160
	11th to 20th	Night	20% 8% 3 6% 4 3 4 4 5% 7% 37%	2160
	21st to end	Night	26% 9% 4 5% 4 3 4 4 5% 6% 30%	2385
November	1st to 10th	Night	21% 9% 3 5% 5% 3 4 5% 5% 7% 32%	2492
	11th to 20th	Night	21% 11% 5% 7% 6% 4 4 5% 5% 7% 25%	2660
	21st to end	Night	20% 12% 5% 9% 6% 3 6% 5% 5% 6% 23%	2660
December	1st to 10th	Night	25% 15% 6% 8% 6% 4 5% 4 5% 6% 16%	2660
	11th to 20th	Night	29% 11% 5% 10% 7% 4 4 5% 4 6% 16%	3293
	21st to end	Night	24% 13% 7% 12% 6% 3 4 4 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	64% 4 8% 16% 7% 1	2066
	11th to 20th	Day	57% 4 11% 16% 10% 1	2090
	21st to end	Day	57% 5% 8% 18% 10% 2	2200
April	1st to 10th	Day	62% 5% 8% 13% 12% 1	2099
	11th to 20th	Day	50% 5% 10% 22% 12% 2	2259
	21st to end	Day	55% 4 11% 17% 12% 2	2340
May	1st to 10th	Day	58% 5% 10% 16% 10% 1	2340
	11th to 20th	Day	48% 6% 9% 21% 14% 2	2446
	21st to end	Day	50% 7% 10% 20% 11% 1	2724
June	1st to 10th	Day	55% 5% 9% 19% 12%	2545
	11th to 20th	Day	50% 5% 11% 18% 14% 2	2700
	21st to end	Day	56% 8% 10% 16% 10% 1	2700
July	1st to 10th	Day	45% 7% 14% 19% 12% 2	2625
	11th to 20th	Day	46% 8% 13% 22% 11% 1	2487
	21st to end	Day	50% 8% 13% 21% 8% 1	2413
August	1st to 10th	Day	44% 9% 13% 20% 13% 1	2314
	11th to 20th	Day	47% 7% 13% 21% 11%	2304
	21st to end	Day	40% 6% 12% 25% 16% 2	2520
September	1st to 10th	Day	41% 6% 10% 24% 16% 2	2160
	11th to 20th	Day	43% 5% 9% 24% 18% 2	2012
	21st to end	Day	44% 5% 8% 24% 18% 2	1972
October	1st to 10th	Day	44% 6% 12% 24% 12% 1	1800
	11th to 20th	Day	48% 7% 13% 22% 10%	1800
	21st to end	Day	57% 5% 10% 17% 10% 1	1967
November	1st to 10th	Day	54% 5% 11% 19% 9% 1	1585
	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	58% 5% 11% 16% 8% 1	2114
	11th to 20th	Night	57% 5% 13% 13% 10% 1	2090
	21st to end	Night	52% 6% 11% 17% 11% 2	2201
April	1st to 10th	Night	58% 5% 9% 14% 11% 2	1860
	11th to 20th	Night	52% 5% 9% 20% 12% 1	1648
	21st to end	Night	54% 5% 9% 18% 12% 1	1620
May	1st to 10th	Night	54% 6% 9% 20% 10% 1	1620
	11th to 20th	Night	50% 7% 8% 23% 11% 1	1453
	21st to end	Night	50% 8% 13% 20% 9% 1	1551
June	1st to 10th	Night	52% 6% 12% 21% 9%	1428
	11th to 20th	Night	49% 6% 12% 20% 12% 1	1260
	21st to end	Night	54% 7% 12% 16% 10% 1	1260
July	1st to 10th	Night	44% 9% 15% 23% 9%	1225
	11th to 20th	Night	48% 7% 14% 21% 9% 1	1328
	21st to end	Night	46% 8% 14% 23% 8% 1	1662
August	1st to 10th	Night	41% 7% 14% 26% 12%	1600
	11th to 20th	Night	47% 6% 16% 21% 10%	1596
	21st to end	Night	40% 6% 15% 25% 13%	1836
September	1st to 10th	Night	39% 6% 11% 28% 14% 2	1800
	11th to 20th	Night	40% 5% 8% 28% 16% 2	1944
	21st to end	Night	46% 5% 9% 23% 16% 2	1988
October	1st to 10th	Night	45% 6% 12% 22% 14% 2	2160
	11th to 20th	Night	46% 6% 14% 25% 9%	2160
	21st to end	Night	54% 5% 10% 18% 11% 1	2385
November	1st to 10th	Night	50% 8% 14% 19% 9%	2492
	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	34% 25% 25% 10% 6%	470
April	1st to 10th	Day	44% 20% 26% 8% 3	420
	11th to 20th	Day	34% 23% 29% 11% 3	412
	21st to end	Day	37% 20% 24% 15% 5%	420
May	1st to 10th	Day	36% 24% 27% 9% 4	423
	11th to 20th	Day	29% 21% 30% 16% 4	588
	21st to end	Day	34% 15% 31% 16% 4 1	680
June	1st to 10th	Day	35% 15% 29% 17% 4	630
	11th to 20th	Day	27% 15% 32% 20% 4 1	630
	21st to end	Day	30% 13% 30% 18% 7% 1	630
July	1st to 10th	Day	25% 13% 31% 22% 8% 1	620
	11th to 20th	Day	22% 11% 33% 24% 10% 1	618
	21st to end	Day	23% 15% 35% 23% 4 1	496
August	1st to 10th	Day	17% 12% 37% 24% 8% 1	446
	11th to 20th	Day	22% 13% 33% 19% 10% 2	439
	21st to end	Day	21% 14% 30% 22% 11% 1	495
September	1st to 10th	Day	19% 14% 34% 25% 7% 1	450
	11th to 20th	Day	25% 17% 30% 18% 6% 4	450
	21st to end	Day	24% 17% 31% 16% 9% 3	446
October	1st to 10th	Day	25% 15% 29% 20% 10% 2	360
	11th to 20th	Day	27% 16% 27% 20% 7% 2	360
	21st to end	Day	33% 20% 28% 14% 5% 1	396
November	1st to 10th	Day	28% 18% 32% 16% 5% 1	365
	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	27% 20% 31% 16% 6%	801
April	1st to 10th	Night	38% 15% 32% 13% 2	600
	11th to 20th	Night	30% 21% 33% 14% 2	534
	21st to end	Night	33% 16% 29% 18% 4	540
May	1st to 10th	Night	29% 16% 33% 17% 4	540
	11th to 20th	Night	31% 13% 35% 17% 4	532
	21st to end	Night	25% 15% 38% 18% 3 1	583
June	1st to 10th	Night	30% 13% 34% 18% 4	528
	11th to 20th	Night	25% 12% 34% 23% 5%	360
	21st to end	Night	30% 6% 37% 19% 8%	360
July	1st to 10th	Night	21% 7% 39% 26% 6%	350
	11th to 20th	Night	17% 9% 41% 24% 9%	458
	21st to end	Night	22% 6% 38% 30% 4	590
August	1st to 10th	Night	17% 9% 37% 30% 8%	538
	11th to 20th	Night	23% 9% 31% 28% 9% 1	532
	21st to end	Night	19% 10% 34% 27% 9% 1	594
September	1st to 10th	Night	19% 11% 35% 26% 9%	540
	11th to 20th	Night	23% 11% 28% 24% 12% 1	684
	21st to end	Night	25% 12% 30% 22% 9% 1	720
October	1st to 10th	Night	25% 9% 30% 26% 9% 1	720
	11th to 20th	Night	23% 16% 31% 20% 9% 1	720
	21st to end	Night	32% 16% 27% 20% 4	792
November	1st to 10th	Night	28% 14% 28% 23% 6% 1	780
	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 2024-03-20 00:31:06. Version ac07

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