Kenockee Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kenockee Observatory clear sky chart from 2005-11-06 to 2026-05-02.

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	13% 10% 4 8% 6% 5% 5% 4 6% 7% 33%	131114
	Night	13% 11% 4 9% 5% 4 4 4 5% 7% 34%	131456
Transparency	Day	49% 5% 12% 21% 12% 1	134686
	Night	49% 5% 12% 21% 12% 2	135956
Seeing	Day	18% 12% 29% 23% 13% 5%	17208
	Night	19% 10% 30% 28% 12% 1	26859

By Month

Percentage Cloud Cover SE (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	11% 17% 6% 13% 6% 5% 4 4 4 5% 25%	4691
	11th to 20th	Day	12% 18% 7% 16% 11% 7% 4 3 4 4 13%	4727
	21st to end	Day	16% 15% 6% 11% 9% 6% 6% 3 4 5% 19%	5780
February	1st to 10th	Day	14% 15% 5% 14% 8% 6% 4 4 5% 5% 22%	1890
	11th to 20th	Day	14% 13% 5% 12% 8% 4 4 5% 5% 5% 25%	1936
	21st to end	Day	13% 17% 5% 12% 6% 5% 5% 3 5% 5% 25%	1730
March	1st to 10th	Day	15% 13% 6% 10% 6% 4 3 2 4 5% 31%	4760
	11th to 20th	Day	12% 13% 4 9% 5% 4 5% 4 5% 8% 32%	5090
	21st to end	Day	18% 14% 4 10% 5% 5% 5% 3 4 6% 27%	5586
April	1st to 10th	Day	16% 15% 4 8% 5% 4 4 3 6% 7% 29%	2403
	11th to 20th	Day	16% 10% 3 7% 5% 5% 4 4 5% 6% 35%	2702
	21st to end	Day	16% 10% 3 7% 5% 5% 4 4 5% 6% 34%	2730
May	1st to 10th	Day	17% 8% 3 8% 5% 4 4 4 6% 6% 35%	5875
	11th to 20th	Day	17% 8% 3 7% 5% 4 5% 4 5% 7% 34%	5861
	21st to end	Day	14% 7% 3 8% 5% 4 5% 4 5% 6% 40%	6567
June	1st to 10th	Day	10% 6% 2 7% 6% 4 5% 4 7% 9% 40%	2960
	11th to 20th	Day	10% 6% 2 6% 5% 4 6% 5% 7% 8% 42%	3000
	21st to end	Day	10% 6% 2 8% 5% 5% 5% 5% 7% 9% 39%	3000
July	1st to 10th	Day	9% 6% 2 7% 5% 5% 6% 5% 8% 10% 37%	6418
	11th to 20th	Day	7% 5% 2 6% 4 4 5% 5% 7% 9% 46%	6360
	21st to end	Day	7% 5% 2 6% 4 5% 5% 4 7% 10% 45%	6470
August	1st to 10th	Day	12% 6% 2 6% 5% 5% 6% 5% 6% 9% 39%	4234
	11th to 20th	Day	9% 6% 2 6% 5% 6% 6% 5% 8% 9% 37%	4174
	21st to end	Day	9% 5% 2 7% 6% 5% 6% 5% 7% 8% 40%	4675
September	1st to 10th	Day	9% 7% 2 6% 5% 5% 6% 4 6% 8% 41%	2270
	11th to 20th	Day	10% 5% 2 5% 4 5% 4 3 6% 8% 48%	2200
	21st to end	Day	16% 7% 2 7% 5% 4 5% 4 7% 9% 35%	2200
October	1st to 10th	Day	13% 7% 3 7% 5% 4 4 4 5% 7% 42%	2110
	11th to 20th	Day	17% 9% 3 7% 5% 5% 4 3 5% 7% 34%	2000
	21st to end	Day	20% 10% 3 8% 5% 4 4 3 5% 7% 30%	2069
November	1st to 10th	Day	13% 10% 3 8% 7% 4 4 4 6% 8% 34%	1852
	11th to 20th	Day	13% 11% 4 11% 7% 5% 4 4 5% 6% 29%	1861
	21st to end	Day	17% 13% 5% 9% 6% 5% 4 4 6% 5% 26%	1680
December	1st to 10th	Day	14% 14% 5% 11% 7% 4 5% 4 7% 7% 23%	2680
	11th to 20th	Day	18% 21% 4 8% 4 5% 4 4 5% 5% 22%	2879
	21st to end	Day	25% 21% 7% 11% 5% 4 3 3 4 5% 14%	3694
January	1st to 10th	Night	14% 14% 5% 11% 5% 4 4 3 5% 5% 29%	8232
	11th to 20th	Night	10% 16% 7% 16% 8% 6% 5% 4 5% 5% 19%	8245
	21st to end	Night	13% 15% 7% 11% 6% 5% 5% 3 5% 5% 25%	8401
February	1st to 10th	Night	14% 16% 5% 11% 7% 5% 5% 3 5% 5% 24%	2730
	11th to 20th	Night	14% 13% 5% 10% 6% 4 4 4 5% 6% 28%	2568
	21st to end	Night	16% 13% 4 11% 6% 5% 5% 3 5% 6% 27%	2076
March	1st to 10th	Night	15% 12% 4 8% 5% 4 4 3 4 6% 35%	5312
	11th to 20th	Night	9% 8% 4 8% 5% 5% 5% 4 6% 9% 37%	5090
	21st to end	Night	15% 10% 3 8% 5% 4 4 3 4 5% 38%	5588
April	1st to 10th	Night	18% 11% 3 7% 5% 4 4 3 6% 7% 33%	2232
	11th to 20th	Night	18% 8% 3 6% 5% 4 4 3 6% 7% 37%	1867
	21st to end	Night	16% 8% 2 6% 5% 4 4 4 6% 8% 36%	1890
May	1st to 10th	Night	18% 9% 3 7% 4 4 5% 3 5% 6% 34%	4042
	11th to 20th	Night	14% 8% 3 8% 5% 5% 4 3 5% 6% 39%	4032
	21st to end	Night	16% 6% 2 4 4 4 4 4 5% 7% 44%	4284
June	1st to 10th	Night	11% 6% 2 6% 3 3 4 4 6% 10% 45%	1435
	11th to 20th	Night	9% 7% 2 6% 3 4 6% 4 7% 10% 43%	1400
	21st to end	Night	8% 5% 2 6% 4 5% 4 4 5% 9% 49%	1400
July	1st to 10th	Night	7% 5% 2 6% 4 4 4 4 7% 11% 45%	3541
	11th to 20th	Night	7% 5% 2 6% 4 4 4 4 6% 9% 49%	3617
	21st to end	Night	7% 4 1 6% 4 5% 5% 4 6% 8% 50%	4379
August	1st to 10th	Night	10% 5% 2 6% 4 4 4 3 6% 8% 47%	2915
	11th to 20th	Night	10% 7% 3 6% 4 4 4 3 6% 8% 46%	2875
	21st to end	Night	7% 5% 2 6% 5% 5% 5% 4 5% 7% 48%	3223
September	1st to 10th	Night	10% 5% 2 6% 5% 5% 5% 4 5% 6% 47%	2107
	11th to 20th	Night	9% 4 2 4 3 3 4 4 4 7% 56%	2200
	21st to end	Night	15% 6% 2 7% 5% 4 4 4 5% 7% 43%	2200
October	1st to 10th	Night	14% 6% 2 6% 4 3 3 3 5% 7% 47%	2290
	11th to 20th	Night	19% 8% 3 7% 5% 4 4 3 5% 6% 36%	2400
	21st to end	Night	20% 9% 3 7% 4 5% 4 4 5% 6% 32%	2770
November	1st to 10th	Night	13% 9% 3 6% 3 4 4 4 5% 7% 41%	2666
	11th to 20th	Night	14% 11% 3 8% 5% 5% 6% 4 6% 7% 30%	2756
	21st to end	Night	18% 15% 4 9% 5% 3 4 4 5% 6% 27%	2940
December	1st to 10th	Night	12% 15% 6% 11% 6% 5% 5% 4 6% 7% 24%	4720
	11th to 20th	Night	14% 18% 5% 11% 6% 4 4 3 5% 5% 23%	5525
	21st to end	Night	23% 20% 6% 10% 5% 4 3 3 4 5% 17%	7508

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% 3 11% 16% 6% 2	4692
	11th to 20th	Day	73% 5% 7% 8% 7%	4727
	21st to end	Day	68% 2 10% 11% 8% 1	5780
February	1st to 10th	Day	64% 5% 10% 14% 7%	1890
	11th to 20th	Day	59% 5% 11% 16% 8% 1	1945
	21st to end	Day	61% 4 12% 14% 7% 2	1730
March	1st to 10th	Day	55% 4 14% 17% 9% 2	4760
	11th to 20th	Day	50% 5% 15% 21% 8% 2	5090
	21st to end	Day	57% 5% 12% 15% 9% 2	5586
April	1st to 10th	Day	53% 5% 11% 19% 10% 1	2403
	11th to 20th	Day	48% 6% 11% 20% 14% 2	2702
	21st to end	Day	49% 6% 13% 18% 12% 1	2730
May	1st to 10th	Day	47% 6% 12% 18% 12% 5%	5910
	11th to 20th	Day	48% 6% 12% 20% 12% 2	5865
	21st to end	Day	44% 5% 9% 19% 18% 4	6582
June	1st to 10th	Day	38% 7% 14% 25% 14% 2	2960
	11th to 20th	Day	37% 7% 14% 25% 15% 2	3000
	21st to end	Day	38% 7% 14% 25% 15% 1	3000
July	1st to 10th	Day	40% 4 14% 25% 15% 2	6349
	11th to 20th	Day	34% 4 13% 32% 16% 1	6285
	21st to end	Day	33% 4 16% 26% 19% 1	6286
August	1st to 10th	Day	40% 6% 14% 23% 15% 1	4221
	11th to 20th	Day	40% 7% 13% 30% 9% 1	4213
	21st to end	Day	39% 5% 13% 31% 11% 1	4674
September	1st to 10th	Day	38% 8% 14% 26% 13% 2	2270
	11th to 20th	Day	33% 6% 14% 33% 13% 1	2200
	21st to end	Day	44% 6% 15% 23% 11% 1	2200
October	1st to 10th	Day	34% 4 10% 34% 16% 2	3435
	11th to 20th	Day	42% 3 11% 26% 17%	3240
	21st to end	Day	47% 4 14% 22% 12%	3319
November	1st to 10th	Day	46% 7% 11% 24% 10% 1	1852
	11th to 20th	Day	54% 5% 14% 17% 9% 1	1861
	21st to end	Day	58% 6% 12% 18% 5%	1680
December	1st to 10th	Day	59% 5% 19% 13% 5%	2680
	11th to 20th	Day	64% 3 13% 12% 8%	2875
	21st to end	Day	74% 4 8% 8% 5%	3694
January	1st to 10th	Night	57% 4 11% 18% 8% 2	8233
	11th to 20th	Night	66% 4 10% 11% 8% 1	8245
	21st to end	Night	62% 3 8% 19% 8%	8401
February	1st to 10th	Night	61% 6% 10% 15% 7% 1	2730
	11th to 20th	Night	55% 6% 11% 18% 10% 1	2570
	21st to end	Night	58% 5% 12% 18% 7% 1	2076
March	1st to 10th	Night	50% 4 14% 20% 10% 1	5312
	11th to 20th	Night	42% 5% 17% 24% 11% 1	5090
	21st to end	Night	48% 4 11% 21% 14% 1	5588
April	1st to 10th	Night	50% 4 11% 20% 12% 2	2232
	11th to 20th	Night	45% 6% 11% 19% 17% 2	1867
	21st to end	Night	44% 6% 12% 20% 15% 3	1890
May	1st to 10th	Night	49% 5% 11% 17% 12% 6%	4069
	11th to 20th	Night	45% 5% 13% 23% 12% 2	4033
	21st to end	Night	38% 6% 12% 24% 15% 5%	4291
June	1st to 10th	Night	34% 6% 11% 27% 19% 2	1435
	11th to 20th	Night	35% 7% 15% 23% 18% 2	1400
	21st to end	Night	33% 6% 14% 26% 20% 2	1400
July	1st to 10th	Night	33% 3 15% 27% 17% 4	3503
	11th to 20th	Night	32% 4 14% 32% 17% 1	3572
	21st to end	Night	31% 5% 14% 24% 23% 2	4251
August	1st to 10th	Night	35% 4 16% 27% 16% 2	2904
	11th to 20th	Night	36% 5% 15% 30% 11% 2	2902
	21st to end	Night	36% 5% 13% 32% 14% 1	3223
September	1st to 10th	Night	36% 6% 13% 29% 13% 2	2107
	11th to 20th	Night	28% 6% 14% 32% 19% 1	2200
	21st to end	Night	41% 6% 13% 28% 12% 1	2200
October	1st to 10th	Night	26% 4 10% 32% 27% 1	3745
	11th to 20th	Night	44% 3 11% 24% 17%	3899
	21st to end	Night	43% 3 13% 27% 13% 1	4470
November	1st to 10th	Night	41% 6% 13% 26% 13% 1	2666
	11th to 20th	Night	52% 6% 14% 19% 9% 1	2756
	21st to end	Night	57% 5% 15% 17% 6%	2940
December	1st to 10th	Night	59% 5% 19% 14% 3	4720
	11th to 20th	Night	61% 4 11% 14% 8% 1	5528
	21st to end	Night	71% 4 10% 10% 5%	7508

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	22% 19% 39% 16% 4 1	330
	11th to 20th	Day	25% 22% 38% 13% 2 1	330
	21st to end	Day	27% 20% 32% 17% 4 1	363
February	1st to 10th	Day	23% 21% 39% 12% 4 1	330
	11th to 20th	Day	25% 17% 38% 19% 1	330
	21st to end	Day	19% 29% 37% 14% 1	273
March	1st to 10th	Day	26% 19% 36% 15% 3	406
	11th to 20th	Day	23% 17% 33% 20% 6% 1	540
	21st to end	Day	27% 14% 32% 21% 5% 1	594
April	1st to 10th	Day	22% 19% 33% 19% 6% 1	540
	11th to 20th	Day	27% 17% 27% 15% 9% 5%	532
	21st to end	Day	22% 12% 31% 24% 9% 2	540
May	1st to 10th	Day	19% 16% 29% 22% 12% 2	507
	11th to 20th	Day	20% 8% 28% 22% 15% 6%	527
	21st to end	Day	15% 10% 21% 29% 18% 7%	573
June	1st to 10th	Day	12% 10% 32% 30% 13% 4	690
	11th to 20th	Day	11% 8% 33% 30% 13% 5%	730
	21st to end	Day	12% 7% 30% 32% 14% 5%	730
July	1st to 10th	Day	8% 7% 23% 30% 20% 12%	721
	11th to 20th	Day	11% 6% 27% 32% 17% 8%	718
	21st to end	Day	7% 3 23% 34% 24% 9%	596
August	1st to 10th	Day	10% 5% 18% 29% 25% 14%	526
	11th to 20th	Day	12% 4 20% 30% 22% 13%	519
	21st to end	Day	13% 5% 21% 28% 21% 12%	583
September	1st to 10th	Day	13% 6% 25% 22% 22% 12%	530
	11th to 20th	Day	9% 5% 17% 25% 30% 14%	530
	21st to end	Day	18% 8% 25% 25% 18% 8%	530
October	1st to 10th	Day	15% 9% 28% 23% 19% 7%	530
	11th to 20th	Day	18% 14% 36% 24% 7% 1	530
	21st to end	Day	25% 15% 36% 17% 6% 1	452
November	1st to 10th	Day	21% 16% 36% 18% 8% 1	330
	11th to 20th	Day	23% 22% 31% 16% 6% 2	313
	21st to end	Day	28% 18% 38% 13% 3	220
December	1st to 10th	Day	24% 20% 32% 17% 6% 1	220
	11th to 20th	Day	30% 20% 32% 15% 3	220
	21st to end	Day	32% 17% 32% 15% 3	275
January	1st to 10th	Night	23% 15% 37% 19% 5% 1	1050
	11th to 20th	Night	24% 18% 33% 20% 4 1	1041
	21st to end	Night	21% 13% 36% 25% 6%	924
February	1st to 10th	Night	23% 13% 39% 22% 3	840
	11th to 20th	Night	22% 15% 34% 25% 4	823
	21st to end	Night	23% 15% 40% 19% 2	692
March	1st to 10th	Night	20% 13% 35% 25% 5%	840
	11th to 20th	Night	18% 14% 36% 25% 6% 1	840
	21st to end	Night	23% 11% 32% 27% 6% 1	924
April	1st to 10th	Night	25% 14% 33% 24% 4 1	767
	11th to 20th	Night	21% 11% 32% 26% 9% 2	623
	21st to end	Night	20% 7% 32% 32% 9%	630
May	1st to 10th	Night	18% 6% 30% 33% 11% 1	603
	11th to 20th	Night	17% 6% 28% 35% 13% 1	591
	21st to end	Night	13% 5% 24% 35% 22% 1	590
June	1st to 10th	Night	14% 4 26% 41% 15%	400
	11th to 20th	Night	13% 4 26% 42% 15% 1	400
	21st to end	Night	10% 4 24% 45% 17% 1	400
July	1st to 10th	Night	8% 2 15% 43% 29% 4	547
	11th to 20th	Night	11% 2 17% 41% 25% 4	582
	21st to end	Night	7% 2 20% 44% 25% 2	657
August	1st to 10th	Night	8% 3 16% 39% 32% 3	597
	11th to 20th	Night	8% 1 17% 38% 33% 3	594
	21st to end	Night	10% 3 19% 36% 28% 4	660
September	1st to 10th	Night	11% 5% 22% 32% 25% 5%	745
	11th to 20th	Night	11% 3 18% 35% 28% 5%	800
	21st to end	Night	17% 6% 21% 34% 18% 4	800
October	1st to 10th	Night	15% 9% 27% 30% 18% 2	800
	11th to 20th	Night	23% 13% 29% 26% 8% 1	800
	21st to end	Night	24% 12% 33% 27% 4	880
November	1st to 10th	Night	19% 13% 31% 25% 11% 1	820
	11th to 20th	Night	22% 14% 34% 23% 6% 1	840
	21st to end	Night	26% 14% 33% 21% 5%	840
December	1st to 10th	Night	22% 14% 39% 19% 5%	840
	11th to 20th	Night	24% 16% 37% 20% 3	924
	21st to end	Night	31% 12% 33% 21% 2	1155

Page generated at 2026-04-29 02:21:47. Version ac07

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