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 2024-11-08.

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	22% 13% 4 8% 5% 4 4 3 5% 6% 26%	101647
	Night	22% 12% 4 9% 5% 4 4 3 5% 6% 27%	97576
Transparency	Day	57% 6% 12% 17% 8% 1	105198
	Night	55% 6% 12% 18% 8% 1	102118
Seeing	Day	29% 21% 30% 15% 4 1	17503
	Night	28% 17% 31% 19% 4	25106

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	14% 15% 6% 14% 8% 5% 5% 4 4 4 22%	2526
	11th to 20th	Day	15% 18% 6% 15% 7% 5% 4 3 4 4 19%	2530
	21st to end	Day	17% 13% 8% 12% 6% 4 4 3 5% 6% 23%	3064
February	1st to 10th	Day	20% 16% 4 9% 6% 4 4 3 4 4 24%	1710
	11th to 20th	Day	17% 17% 5% 11% 6% 5% 4 3 4 5% 24%	1663
	21st to end	Day	14% 18% 6% 7% 6% 4 3 2 3 6% 30%	1498
March	1st to 10th	Day	25% 15% 4 8% 5% 4 4 2 3 4 26%	3291
	11th to 20th	Day	14% 26% 8% 11% 6% 5% 4 3 4 4 18%	3480
	21st to end	Day	30% 18% 5% 9% 5% 3 3 2 2 4 19%	3905
April	1st to 10th	Day	24% 19% 4 8% 4 3 3 3 4 5% 23%	2280
	11th to 20th	Day	22% 14% 4 6% 5% 3 4 4 4 6% 28%	2254
	21st to end	Day	25% 16% 3 7% 4 4 4 3 4 5% 25%	2460
May	1st to 10th	Day	28% 19% 3 8% 4 3 3 3 4 6% 20%	4354
	11th to 20th	Day	23% 15% 3 7% 4 4 4 3 4 5% 27%	4398
	21st to end	Day	21% 11% 4 8% 4 5% 5% 4 6% 8% 24%	4836
June	1st to 10th	Day	29% 12% 4 7% 5% 4 4 3 5% 7% 20%	2660
	11th to 20th	Day	24% 9% 3 6% 5% 4 4 3 5% 6% 30%	2660
	21st to end	Day	31% 10% 3 8% 4 4 4 3 5% 5% 23%	2660
July	1st to 10th	Day	23% 8% 3 8% 5% 5% 5% 4 6% 7% 27%	4440
	11th to 20th	Day	19% 10% 4 9% 5% 5% 5% 4 6% 8% 26%	4440
	21st to end	Day	19% 10% 3 7% 5% 4 5% 4 6% 7% 29%	4815
August	1st to 10th	Day	25% 11% 3 8% 5% 5% 5% 4 5% 7% 22%	4147
	11th to 20th	Day	19% 8% 3 8% 5% 5% 5% 5% 6% 7% 29%	4045
	21st to end	Day	12% 7% 2 6% 4 5% 5% 4 6% 8% 42%	4254
September	1st to 10th	Day	20% 7% 3 6% 4 4 4 4 7% 6% 36%	2280
	11th to 20th	Day	21% 8% 3 6% 4 3 5% 3 5% 7% 36%	2280
	21st to end	Day	21% 8% 2 7% 4 4 4 3 5% 6% 35%	1990
October	1st to 10th	Day	21% 8% 3 7% 4 4 4 3 6% 7% 33%	1900
	11th to 20th	Day	22% 9% 2 7% 4 4 4 3 6% 6% 31%	1900
	21st to end	Day	23% 12% 3 8% 5% 4 4 3 5% 7% 26%	2027
November	1st to 10th	Day	25% 12% 4 8% 4 4 4 4 5% 4 27%	1651
	11th to 20th	Day	22% 16% 4 9% 4 3 3 3 5% 6% 25%	1520
	21st to end	Day	19% 16% 4 7% 6% 5% 4 3 5% 7% 23%	1520
December	1st to 10th	Day	23% 17% 6% 9% 6% 4 3 3 3 4 22%	1520
	11th to 20th	Day	32% 15% 4 9% 5% 3 3 3 3 4 19%	1906
	21st to end	Day	22% 12% 9% 14% 4 3 3 2 4 5% 20%	2783
January	1st to 10th	Night	15% 12% 5% 11% 5% 5% 4 4 5% 7% 27%	4429
	11th to 20th	Night	20% 16% 4 15% 5% 5% 4 3 4 4 20%	4440
	21st to end	Night	17% 12% 5% 15% 5% 4 5% 3 5% 5% 23%	4592
February	1st to 10th	Night	21% 13% 4 11% 7% 5% 4 4 5% 4 23%	2470
	11th to 20th	Night	17% 15% 5% 10% 5% 4 5% 3 5% 5% 24%	2403
	21st to end	Night	12% 16% 6% 10% 7% 4 5% 5% 4 5% 26%	1956
March	1st to 10th	Night	22% 15% 5% 11% 6% 4 4 3 3 5% 22%	3548
	11th to 20th	Night	21% 18% 9% 9% 4 3 4 2 4 5% 21%	3479
	21st to end	Night	29% 14% 7% 11% 5% 3 3 2 3 4 21%	3726
April	1st to 10th	Night	24% 17% 4 6% 5% 4 4 3 4 4 25%	1900
	11th to 20th	Night	21% 15% 3 6% 4 3 3 3 5% 6% 32%	1876
	21st to end	Night	26% 13% 3 7% 4 3 3 3 5% 5% 27%	1717
May	1st to 10th	Night	24% 26% 4 5% 4 3 3 2 4 4 20%	2592
	11th to 20th	Night	23% 13% 3 7% 4 4 4 3 5% 6% 30%	2506
	21st to end	Night	21% 11% 4 8% 5% 5% 5% 4 6% 8% 24%	2749
June	1st to 10th	Night	29% 12% 3 7% 4 3 2 2 5% 6% 25%	1520
	11th to 20th	Night	22% 11% 3 7% 4 3 3 3 4 6% 35%	1520
	21st to end	Night	28% 13% 3 7% 5% 3 3 3 5% 5% 25%	1520
July	1st to 10th	Night	22% 11% 4 9% 4 5% 4 4 6% 7% 25%	2530
	11th to 20th	Night	22% 10% 3 7% 4 4 4 4 5% 8% 28%	2530
	21st to end	Night	23% 8% 3 6% 4 3 3 3 5% 7% 34%	2750
August	1st to 10th	Night	27% 9% 2 6% 3 3 3 4 4 6% 32%	2781
	11th to 20th	Night	19% 10% 3 7% 3 4 5% 4 6% 9% 30%	2782
	21st to end	Night	16% 5% 2 4 4 3 3 3 4 6% 49%	3402
September	1st to 10th	Night	17% 7% 3 5% 3 3 4 3 7% 8% 41%	1900
	11th to 20th	Night	21% 8% 2 6% 2 3 3 3 4 7% 41%	1900
	21st to end	Night	22% 8% 3 6% 4 3 3 3 5% 7% 36%	2186
October	1st to 10th	Night	21% 7% 3 6% 4 4 4 3 4 8% 37%	2280
	11th to 20th	Night	21% 8% 3 6% 4 4 4 3 4 7% 36%	2280
	21st to end	Night	26% 12% 3 7% 4 4 4 2 4 5% 29%	2570
November	1st to 10th	Night	23% 11% 3 7% 4 4 5% 3 5% 5% 29%	2585
	11th to 20th	Night	23% 11% 3 7% 5% 4 4 4 6% 5% 27%	2660
	21st to end	Night	22% 13% 5% 8% 5% 4 4 3 4 6% 25%	2660
December	1st to 10th	Night	25% 16% 4 10% 5% 4 4 3 3 5% 22%	2660
	11th to 20th	Night	34% 12% 3 7% 4 4 3 3 4 4 22%	3293
	21st to end	Night	27% 13% 5% 11% 4 4 3 3 4 4 21%	4884

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	58% 8% 17% 12% 4 1	2527
	11th to 20th	Day	59% 11% 10% 14% 6% 1	2530
	21st to end	Day	58% 7% 9% 14% 11% 1	3064
February	1st to 10th	Day	63% 5% 8% 13% 11% 1	1710
	11th to 20th	Day	62% 6% 10% 14% 8% 1	1671
	21st to end	Day	56% 4 9% 17% 11% 4	1498
March	1st to 10th	Day	61% 5% 8% 15% 10% 1	3295
	11th to 20th	Day	67% 7% 8% 11% 5% 1	3480
	21st to end	Day	69% 5% 7% 11% 7% 1	3905
April	1st to 10th	Day	64% 4 7% 14% 9% 3	2280
	11th to 20th	Day	55% 6% 10% 17% 11% 1	2254
	21st to end	Day	58% 6% 11% 16% 8% 1	2460
May	1st to 10th	Day	65% 6% 10% 14% 4 1	4369
	11th to 20th	Day	58% 7% 12% 16% 7%	4402
	21st to end	Day	54% 11% 15% 15% 5%	4836
June	1st to 10th	Day	63% 7% 11% 14% 5%	2660
	11th to 20th	Day	54% 6% 12% 19% 8% 1	2660
	21st to end	Day	64% 6% 11% 12% 7% 1	2660
July	1st to 10th	Day	56% 6% 13% 15% 9% 1	4370
	11th to 20th	Day	56% 6% 14% 17% 7%	4364
	21st to end	Day	53% 7% 15% 18% 8%	4662
August	1st to 10th	Day	60% 7% 12% 16% 5%	4133
	11th to 20th	Day	50% 8% 14% 23% 6%	4084
	21st to end	Day	39% 5% 14% 28% 14%	4254
September	1st to 10th	Day	45% 7% 13% 21% 12% 1	2280
	11th to 20th	Day	47% 6% 11% 23% 12% 1	2280
	21st to end	Day	48% 6% 10% 23% 13% 1	1990
October	1st to 10th	Day	51% 5% 12% 21% 10% 1	3160
	11th to 20th	Day	43% 5% 12% 25% 15%	3140
	21st to end	Day	51% 4 15% 19% 9% 2	3321
November	1st to 10th	Day	57% 6% 11% 19% 7%	1651
	11th to 20th	Day	56% 7% 14% 15% 8% 1	1520
	21st to end	Day	57% 8% 14% 12% 7% 1	1520
December	1st to 10th	Day	64% 7% 10% 14% 5% 1	1520
	11th to 20th	Day	68% 5% 9% 12% 6% 1	1905
	21st to end	Day	64% 7% 14% 10% 5% 1	2783
January	1st to 10th	Night	51% 7% 20% 18% 4	4429
	11th to 20th	Night	62% 9% 9% 13% 7% 1	4440
	21st to end	Night	58% 7% 12% 15% 7%	4592
February	1st to 10th	Night	62% 6% 9% 12% 10% 2	2470
	11th to 20th	Night	59% 6% 11% 14% 8% 2	2406
	21st to end	Night	57% 6% 10% 17% 9% 2	1956
March	1st to 10th	Night	62% 5% 8% 14% 10%	3557
	11th to 20th	Night	64% 6% 8% 15% 7% 1	3480
	21st to end	Night	66% 5% 7% 15% 5% 1	3726
April	1st to 10th	Night	61% 6% 8% 14% 9% 2	1900
	11th to 20th	Night	52% 6% 9% 20% 12% 2	1876
	21st to end	Night	56% 5% 10% 16% 11% 1	1717
May	1st to 10th	Night	66% 6% 8% 14% 4 1	2597
	11th to 20th	Night	54% 7% 12% 19% 7%	2507
	21st to end	Night	56% 10% 14% 15% 4 1	2750
June	1st to 10th	Night	60% 7% 11% 16% 6%	1520
	11th to 20th	Night	51% 5% 13% 18% 13%	1520
	21st to end	Night	63% 6% 10% 14% 7%	1520
July	1st to 10th	Night	59% 6% 12% 14% 6% 3	2491
	11th to 20th	Night	55% 6% 15% 15% 8%	2482
	21st to end	Night	50% 6% 13% 21% 10% 1	2663
August	1st to 10th	Night	54% 6% 16% 21% 4	2770
	11th to 20th	Night	50% 9% 15% 22% 4	2809
	21st to end	Night	36% 5% 14% 29% 15%	3401
September	1st to 10th	Night	40% 7% 14% 25% 12% 1	1900
	11th to 20th	Night	43% 6% 11% 26% 13% 1	1900
	21st to end	Night	48% 6% 10% 25% 10% 1	2186
October	1st to 10th	Night	51% 5% 13% 21% 9% 1	3800
	11th to 20th	Night	37% 4 13% 28% 17% 1	3779
	21st to end	Night	48% 5% 13% 22% 12%	4230
November	1st to 10th	Night	53% 7% 12% 18% 9%	2585
	11th to 20th	Night	54% 9% 13% 14% 10% 1	2660
	21st to end	Night	57% 7% 14% 16% 6%	2660
December	1st to 10th	Night	63% 5% 12% 14% 6%	2660
	11th to 20th	Night	64% 5% 9% 14% 7%	3295
	21st to end	Night	64% 6% 12% 13% 4	4884

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	32% 25% 26% 15% 2	370
	11th to 20th	Day	32% 24% 31% 9% 4	370
	21st to end	Day	25% 26% 35% 11% 2	407
February	1st to 10th	Day	34% 24% 27% 12% 2	370
	11th to 20th	Day	30% 33% 25% 11% 1	366
	21st to end	Day	28% 25% 32% 11% 4	307
March	1st to 10th	Day	28% 29% 32% 9% 2	418
	11th to 20th	Day	30% 30% 27% 10% 3	460
	21st to end	Day	34% 29% 24% 9% 3 1	506
April	1st to 10th	Day	39% 28% 25% 7% 1	460
	11th to 20th	Day	37% 26% 26% 9% 2	452
	21st to end	Day	30% 23% 32% 12% 2 1	460
May	1st to 10th	Day	37% 23% 27% 9% 3 1	608
	11th to 20th	Day	26% 21% 33% 15% 4 1	674
	21st to end	Day	32% 18% 33% 15% 2 1	735
June	1st to 10th	Day	38% 17% 27% 14% 4	680
	11th to 20th	Day	27% 19% 35% 14% 4 1	680
	21st to end	Day	37% 13% 31% 15% 4 1	680
July	1st to 10th	Day	24% 14% 36% 22% 4	670
	11th to 20th	Day	25% 10% 37% 21% 6%	668
	21st to end	Day	30% 11% 31% 21% 6%	740
August	1st to 10th	Day	21% 11% 37% 24% 6% 1	515
	11th to 20th	Day	24% 15% 32% 20% 8% 1	479
	21st to end	Day	22% 15% 32% 21% 8% 1	539
September	1st to 10th	Day	21% 18% 36% 19% 6% 1	490
	11th to 20th	Day	25% 19% 30% 18% 7% 1	490
	21st to end	Day	23% 19% 27% 22% 7% 1	427
October	1st to 10th	Day	24% 16% 32% 19% 6% 3	390
	11th to 20th	Day	23% 23% 31% 16% 7% 1	390
	21st to end	Day	28% 25% 30% 11% 5% 1	429
November	1st to 10th	Day	28% 22% 29% 16% 4 1	386
	11th to 20th	Day	32% 25% 25% 13% 5% 1	370
	21st to end	Day	30% 28% 28% 10% 3 1	370
December	1st to 10th	Day	36% 23% 28% 11% 2	370
	11th to 20th	Day	39% 26% 26% 8% 1	370
	21st to end	Day	28% 29% 28% 12% 3	407
January	1st to 10th	Night	28% 25% 32% 14% 2	850
	11th to 20th	Night	32% 22% 31% 13% 2	850
	21st to end	Night	26% 25% 33% 14% 2	852
February	1st to 10th	Night	31% 20% 31% 16% 1	760
	11th to 20th	Night	27% 31% 29% 12% 1	743
	21st to end	Night	20% 26% 35% 15% 5%	628
March	1st to 10th	Night	24% 25% 35% 14% 2	760
	11th to 20th	Night	26% 22% 28% 20% 4	760
	21st to end	Night	27% 22% 30% 17% 3	784
April	1st to 10th	Night	35% 21% 25% 16% 3	570
	11th to 20th	Night	31% 18% 33% 15% 4	564
	21st to end	Night	33% 13% 32% 18% 3 1	570
May	1st to 10th	Night	33% 15% 31% 15% 4 1	570
	11th to 20th	Night	29% 13% 30% 23% 6%	562
	21st to end	Night	25% 15% 39% 17% 3	616
June	1st to 10th	Night	34% 13% 34% 16% 3	570
	11th to 20th	Night	29% 11% 37% 20% 3	570
	21st to end	Night	36% 9% 30% 22% 4	570
July	1st to 10th	Night	24% 7% 40% 24% 5%	556
	11th to 20th	Night	24% 7% 34% 31% 4	552
	21st to end	Night	27% 7% 35% 25% 6%	623
August	1st to 10th	Night	23% 5% 33% 30% 9%	568
	11th to 20th	Night	23% 7% 32% 29% 9% 1	562
	21st to end	Night	20% 9% 29% 31% 11%	627
September	1st to 10th	Night	21% 7% 35% 28% 9%	570
	11th to 20th	Night	25% 11% 29% 26% 9%	570
	21st to end	Night	26% 13% 31% 23% 7%	737
October	1st to 10th	Night	23% 12% 32% 25% 7% 1	760
	11th to 20th	Night	26% 15% 32% 20% 7% 1	760
	21st to end	Night	32% 19% 28% 17% 3	869
November	1st to 10th	Night	30% 15% 32% 17% 4 1	868
	11th to 20th	Night	30% 19% 30% 16% 4	850
	21st to end	Night	30% 22% 28% 16% 4	850
December	1st to 10th	Night	34% 23% 28% 12% 3	850
	11th to 20th	Night	34% 24% 29% 10% 2	850
	21st to end	Night	31% 25% 28% 13% 2	935

Page generated at 2024-11-05 09:15:54. Version ac07

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