Liscomb Game Sanctuary
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Liscomb Game Sanctuary clear sky chart from 2005-11-06 to 2025-11-18.

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% 13% 4 9% 5% 4 4 3 5% 6% 26%	127423
	Night	21% 13% 4 9% 5% 4 4 3 4 6% 28%	123154
Transparency	Day	56% 6% 12% 17% 8% 1	130956
	Night	56% 6% 11% 18% 9% 1	127713
Seeing	Day	30% 21% 30% 14% 4 1	18922
	Night	29% 17% 31% 19% 4	26522

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	12% 20% 6% 14% 7% 5% 5% 4 4 5% 19%	3616
	11th to 20th	Day	14% 18% 10% 17% 6% 4 4 3 4 4 17%	3591
	21st to end	Day	13% 13% 7% 11% 5% 5% 4 3 5% 6% 28%	4393
February	1st to 10th	Day	20% 16% 4 9% 7% 4 4 3 4 4 24%	1800
	11th to 20th	Day	17% 17% 5% 11% 6% 5% 4 3 4 5% 24%	1753
	21st to end	Day	14% 17% 6% 8% 6% 4 4 2 3 6% 30%	1575
March	1st to 10th	Day	23% 15% 4 12% 5% 4 3 2 3 4 24%	4721
	11th to 20th	Day	16% 20% 6% 10% 5% 4 3 3 4 5% 23%	4980
	21st to end	Day	26% 18% 5% 10% 5% 4 4 2 3 5% 18%	5597
April	1st to 10th	Day	25% 18% 4 8% 4 3 3 3 4 4 23%	2400
	11th to 20th	Day	22% 14% 4 6% 5% 4 4 4 4 6% 27%	2374
	21st to end	Day	25% 16% 3 7% 4 4 4 3 4 5% 25%	2590
May	1st to 10th	Day	29% 17% 3 7% 4 3 4 3 5% 6% 20%	6246
	11th to 20th	Day	23% 14% 3 8% 5% 4 4 3 4 6% 27%	6318
	21st to end	Day	22% 13% 3 8% 4 4 4 4 5% 7% 26%	6948
June	1st to 10th	Day	28% 12% 4 7% 5% 4 4 3 5% 7% 21%	2800
	11th to 20th	Day	23% 9% 3 7% 5% 4 4 4 5% 7% 30%	2800
	21st to end	Day	31% 10% 3 8% 4 4 4 3 5% 5% 23%	2800
July	1st to 10th	Day	21% 9% 3 9% 5% 5% 5% 4 6% 8% 24%	6360
	11th to 20th	Day	18% 9% 3 8% 5% 5% 5% 4 5% 8% 30%	6360
	21st to end	Day	16% 8% 3 7% 5% 5% 5% 4 7% 9% 33%	6927
August	1st to 10th	Day	25% 11% 3 7% 5% 5% 5% 4 5% 7% 24%	4278
	11th to 20th	Day	19% 8% 3 8% 5% 5% 5% 5% 6% 7% 30%	4175
	21st to end	Day	12% 7% 2 6% 4 5% 5% 4 6% 8% 42%	4388
September	1st to 10th	Day	20% 7% 3 7% 4 4 4 4 6% 7% 36%	2400
	11th to 20th	Day	21% 8% 3 6% 5% 3 5% 3 5% 7% 36%	2400
	21st to end	Day	20% 8% 2 7% 4 4 4 3 5% 7% 36%	2095
October	1st to 10th	Day	20% 7% 3 7% 4 4 4 3 6% 7% 34%	2000
	11th to 20th	Day	21% 10% 3 8% 4 4 5% 3 6% 6% 30%	2000
	21st to end	Day	23% 12% 3 8% 5% 4 4 3 5% 7% 26%	2133
November	1st to 10th	Day	25% 12% 3 8% 4 4 4 4 5% 5% 27%	1761
	11th to 20th	Day	24% 18% 4 9% 4 3 3 3 5% 5% 23%	1656
	21st to end	Day	19% 18% 5% 7% 6% 5% 4 3 5% 7% 22%	1600
December	1st to 10th	Day	18% 15% 7% 10% 5% 3 3 3 3 5% 28%	2610
	11th to 20th	Day	29% 15% 4 7% 4 3 3 2 3 4 26%	2996
	21st to end	Day	19% 13% 8% 14% 4 3 3 3 4 6% 22%	3982
January	1st to 10th	Night	14% 16% 6% 12% 5% 5% 4 4 5% 6% 23%	6349
	11th to 20th	Night	16% 16% 7% 18% 7% 5% 4 3 3 4 18%	6314
	21st to end	Night	12% 12% 5% 14% 6% 5% 5% 3 5% 6% 27%	6564
February	1st to 10th	Night	20% 13% 4 11% 7% 5% 4 3 5% 4 23%	2600
	11th to 20th	Night	17% 15% 5% 10% 5% 4 5% 3 5% 6% 24%	2533
	21st to end	Night	13% 16% 6% 10% 7% 4 4 5% 4 5% 26%	2055
March	1st to 10th	Night	24% 14% 5% 12% 7% 4 4 3 3 4 20%	5104
	11th to 20th	Night	22% 15% 7% 8% 4 3 3 2 4 5% 27%	4979
	21st to end	Night	29% 15% 6% 11% 4 3 2 2 3 4 21%	5334
April	1st to 10th	Night	25% 17% 4 6% 5% 4 4 3 4 4 25%	2000
	11th to 20th	Night	21% 15% 3 6% 4 3 3 3 5% 6% 31%	1976
	21st to end	Night	25% 13% 2 7% 4 3 3 3 5% 6% 27%	1807
May	1st to 10th	Night	26% 23% 4 6% 4 4 4 2 4 4 18%	3708
	11th to 20th	Night	23% 16% 3 6% 4 3 4 3 5% 6% 29%	3596
	21st to end	Night	18% 14% 4 7% 5% 4 4 3 5% 7% 27%	3948
June	1st to 10th	Night	29% 12% 3 7% 4 3 2 2 5% 6% 27%	1600
	11th to 20th	Night	22% 11% 3 7% 4 3 3 3 4 6% 35%	1600
	21st to end	Night	28% 13% 3 7% 5% 3 3 3 5% 5% 25%	1600
July	1st to 10th	Night	21% 10% 3 10% 5% 5% 5% 4 6% 8% 23%	3619
	11th to 20th	Night	20% 11% 3 6% 3 3 3 3 5% 7% 34%	3620
	21st to end	Night	20% 8% 3 6% 4 4 4 4 6% 9% 34%	3948
August	1st to 10th	Night	26% 9% 2 6% 3 3 3 3 4 6% 33%	2870
	11th to 20th	Night	18% 10% 3 7% 3 4 5% 4 6% 9% 31%	2872
	21st to end	Night	16% 5% 2 4 4 4 3 3 4 6% 48%	3510
September	1st to 10th	Night	18% 7% 3 5% 3 3 4 3 6% 7% 41%	2000
	11th to 20th	Night	20% 8% 2 6% 2 3 3 3 4 7% 41%	2000
	21st to end	Night	21% 8% 3 6% 4 3 3 3 5% 7% 37%	2301
October	1st to 10th	Night	20% 7% 2 6% 4 4 4 3 4 7% 38%	2400
	11th to 20th	Night	20% 9% 3 7% 4 4 4 3 4 7% 35%	2400
	21st to end	Night	26% 12% 3 7% 5% 4 4 2 4 5% 28%	2705
November	1st to 10th	Night	23% 12% 3 7% 4 4 5% 3 5% 5% 29%	2754
	11th to 20th	Night	24% 13% 3 7% 5% 4 4 4 6% 5% 25%	2899
	21st to end	Night	22% 15% 5% 8% 5% 4 4 3 4 6% 24%	2800
December	1st to 10th	Night	17% 13% 5% 9% 4 3 4 3 4 6% 33%	4580
	11th to 20th	Night	29% 13% 3 7% 4 3 3 3 3 4 28%	5213
	21st to end	Night	24% 13% 5% 10% 4 4 3 3 5% 6% 23%	6996

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	61% 7% 14% 13% 5%	3617
	11th to 20th	Day	63% 8% 12% 12% 5%	3620
	21st to end	Day	54% 5% 8% 13% 15% 4	4393
February	1st to 10th	Day	62% 5% 8% 13% 11% 1	1800
	11th to 20th	Day	61% 5% 10% 14% 8% 1	1761
	21st to end	Day	56% 4 9% 16% 11% 4	1575
March	1st to 10th	Day	63% 4 8% 12% 10% 4	4725
	11th to 20th	Day	61% 6% 13% 15% 5% 1	4980
	21st to end	Day	69% 4 6% 14% 6% 1	5597
April	1st to 10th	Day	64% 4 7% 13% 9% 3	2400
	11th to 20th	Day	56% 6% 9% 17% 11% 1	2374
	21st to end	Day	58% 6% 10% 16% 8% 1	2590
May	1st to 10th	Day	65% 5% 10% 14% 5%	6258
	11th to 20th	Day	59% 6% 12% 16% 7%	6322
	21st to end	Day	55% 8% 12% 17% 7%	6948
June	1st to 10th	Day	62% 7% 11% 14% 6%	2800
	11th to 20th	Day	53% 6% 12% 19% 9% 1	2800
	21st to end	Day	63% 6% 10% 13% 7% 1	2800
July	1st to 10th	Day	57% 6% 15% 14% 7% 1	6290
	11th to 20th	Day	54% 5% 13% 20% 8%	6284
	21st to end	Day	46% 7% 17% 22% 8%	6730
August	1st to 10th	Day	59% 7% 12% 17% 6%	4264
	11th to 20th	Day	49% 8% 14% 23% 6%	4214
	21st to end	Day	39% 5% 14% 28% 14%	4388
September	1st to 10th	Day	45% 7% 12% 22% 12% 1	2400
	11th to 20th	Day	47% 6% 11% 23% 12% 1	2400
	21st to end	Day	47% 5% 10% 23% 14% 1	2095
October	1st to 10th	Day	50% 5% 12% 22% 10%	3260
	11th to 20th	Day	44% 5% 11% 25% 15%	3240
	21st to end	Day	51% 4 15% 19% 9% 2	3427
November	1st to 10th	Day	57% 6% 11% 18% 7%	1761
	11th to 20th	Day	59% 6% 13% 14% 7% 1	1656
	21st to end	Day	59% 8% 14% 12% 7% 1	1600
December	1st to 10th	Day	58% 5% 9% 22% 5%	2610
	11th to 20th	Day	62% 3 8% 12% 13%	2995
	21st to end	Day	60% 5% 12% 14% 9%	3982
January	1st to 10th	Night	58% 6% 16% 17% 4	6349
	11th to 20th	Night	66% 7% 9% 13% 5%	6360
	21st to end	Night	53% 6% 10% 16% 13% 2	6564
February	1st to 10th	Night	62% 5% 9% 12% 10% 2	2600
	11th to 20th	Night	59% 6% 11% 14% 8% 1	2536
	21st to end	Night	57% 6% 10% 17% 9% 2	2055
March	1st to 10th	Night	66% 4 7% 11% 11% 1	5113
	11th to 20th	Night	60% 5% 10% 16% 8% 1	4980
	21st to end	Night	67% 4 6% 16% 6% 1	5334
April	1st to 10th	Night	61% 5% 8% 14% 9% 2	2000
	11th to 20th	Night	52% 6% 9% 20% 12% 2	1976
	21st to end	Night	56% 5% 11% 17% 11% 1	1807
May	1st to 10th	Night	69% 4 7% 15% 5%	3713
	11th to 20th	Night	57% 6% 10% 19% 7% 1	3597
	21st to end	Night	55% 8% 12% 19% 5%	3949
June	1st to 10th	Night	59% 6% 10% 17% 7%	1600
	11th to 20th	Night	50% 5% 12% 19% 13%	1600
	21st to end	Night	62% 6% 10% 14% 7% 1	1600
July	1st to 10th	Night	59% 6% 12% 15% 5% 2	3581
	11th to 20th	Night	52% 5% 12% 20% 10% 1	3572
	21st to end	Night	48% 6% 15% 22% 8%	3831
August	1st to 10th	Night	53% 6% 15% 21% 4	2859
	11th to 20th	Night	49% 9% 15% 22% 5%	2899
	21st to end	Night	37% 5% 14% 29% 15%	3509
September	1st to 10th	Night	41% 6% 14% 25% 13% 1	2000
	11th to 20th	Night	43% 6% 11% 27% 13% 1	2000
	21st to end	Night	47% 6% 10% 26% 11% 1	2301
October	1st to 10th	Night	50% 5% 13% 21% 10% 1	3920
	11th to 20th	Night	38% 4 13% 27% 17% 1	3899
	21st to end	Night	49% 5% 13% 22% 12%	4365
November	1st to 10th	Night	54% 7% 12% 18% 9%	2754
	11th to 20th	Night	56% 8% 12% 13% 10% 1	2899
	21st to end	Night	58% 7% 14% 15% 6%	2800
December	1st to 10th	Night	53% 3 11% 24% 8%	4580
	11th to 20th	Night	58% 4 9% 16% 11% 1	5215
	21st to end	Night	60% 5% 11% 16% 8%	6996

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	34% 25% 26% 14% 2	400
	11th to 20th	Day	31% 22% 32% 11% 4	400
	21st to end	Day	26% 26% 35% 10% 2	440
February	1st to 10th	Day	36% 24% 27% 12% 2	400
	11th to 20th	Day	31% 33% 25% 10% 1	396
	21st to end	Day	28% 24% 31% 12% 4	331
March	1st to 10th	Day	29% 29% 31% 9% 2	453
	11th to 20th	Day	30% 30% 28% 9% 3	500
	21st to end	Day	34% 30% 24% 8% 3 1	550
April	1st to 10th	Day	41% 28% 23% 7% 1	500
	11th to 20th	Day	38% 26% 25% 9% 2	492
	21st to end	Day	32% 24% 30% 11% 2 1	500
May	1st to 10th	Day	37% 22% 27% 9% 3 1	656
	11th to 20th	Day	27% 21% 31% 15% 4 1	724
	21st to end	Day	32% 18% 33% 15% 2 1	790
June	1st to 10th	Day	37% 17% 28% 14% 4	730
	11th to 20th	Day	27% 20% 35% 14% 4 1	730
	21st to end	Day	37% 14% 31% 14% 4 1	730
July	1st to 10th	Day	24% 14% 36% 21% 4	720
	11th to 20th	Day	25% 10% 37% 22% 6%	718
	21st to end	Day	29% 12% 32% 21% 6%	795
August	1st to 10th	Day	21% 10% 38% 23% 6% 1	556
	11th to 20th	Day	23% 15% 34% 20% 8% 1	519
	21st to end	Day	22% 16% 33% 20% 8% 1	583
September	1st to 10th	Day	20% 17% 37% 19% 6% 1	530
	11th to 20th	Day	25% 19% 30% 18% 7% 1	530
	21st to end	Day	23% 19% 30% 21% 7% 1	461
October	1st to 10th	Day	23% 17% 32% 19% 6% 3	420
	11th to 20th	Day	23% 21% 32% 15% 7% 1	420
	21st to end	Day	29% 25% 30% 11% 5% 1	462
November	1st to 10th	Day	31% 22% 28% 15% 4 1	425
	11th to 20th	Day	36% 24% 24% 12% 4	421
	21st to end	Day	31% 28% 28% 10% 3 1	400
December	1st to 10th	Day	35% 23% 28% 12% 2	400
	11th to 20th	Day	39% 25% 26% 9% 1	400
	21st to end	Day	29% 29% 28% 12% 3	440
January	1st to 10th	Night	28% 25% 31% 14% 2	900
	11th to 20th	Night	31% 22% 31% 14% 2	900
	21st to end	Night	26% 26% 32% 13% 2	897
February	1st to 10th	Night	32% 20% 31% 16% 1	800
	11th to 20th	Night	29% 30% 29% 12% 1	783
	21st to end	Night	20% 25% 35% 15% 5%	660
March	1st to 10th	Night	26% 25% 34% 14% 2	800
	11th to 20th	Night	26% 22% 28% 20% 4	800
	21st to end	Night	28% 22% 30% 17% 3	825
April	1st to 10th	Night	36% 21% 25% 15% 3	600
	11th to 20th	Night	30% 19% 32% 15% 4	594
	21st to end	Night	34% 13% 33% 18% 3 1	600
May	1st to 10th	Night	34% 15% 31% 16% 4 1	600
	11th to 20th	Night	30% 14% 29% 22% 5%	592
	21st to end	Night	25% 14% 40% 17% 3	649
June	1st to 10th	Night	33% 14% 33% 17% 3	600
	11th to 20th	Night	29% 10% 38% 20% 3	600
	21st to end	Night	36% 9% 29% 22% 4	600
July	1st to 10th	Night	24% 7% 40% 24% 5%	586
	11th to 20th	Night	23% 7% 34% 32% 4	582
	21st to end	Night	27% 7% 35% 25% 6%	656
August	1st to 10th	Night	22% 5% 34% 31% 9%	598
	11th to 20th	Night	23% 7% 32% 29% 9% 1	592
	21st to end	Night	20% 9% 29% 30% 10%	660
September	1st to 10th	Night	22% 7% 34% 28% 9%	600
	11th to 20th	Night	25% 11% 28% 27% 9% 1	600
	21st to end	Night	25% 13% 31% 24% 6% 1	776
October	1st to 10th	Night	23% 12% 32% 25% 7% 1	800
	11th to 20th	Night	25% 15% 32% 20% 7% 1	800
	21st to end	Night	32% 19% 28% 17% 3	916
November	1st to 10th	Night	31% 17% 31% 16% 4 1	930
	11th to 20th	Night	33% 18% 29% 15% 4	936
	21st to end	Night	32% 23% 27% 15% 3	900
December	1st to 10th	Night	33% 22% 29% 12% 3	900
	11th to 20th	Night	34% 24% 29% 11% 2	900
	21st to end	Night	32% 25% 28% 14% 2	990

Page generated at 2025-11-15 01:55:56. Version ac07

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