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 2024-01-12.

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% 12% 4 7% 6% 3 4 4 5% 6% 27%	74714
	Night	22% 11% 4 7% 5% 3 4 4 5% 6% 28%	75022
Transparency	Day	57% 6% 12% 17% 8% 1	74417
	Night	56% 6% 12% 17% 8% 1	74854
Seeing	Day	29% 21% 31% 15% 4 1	16309
	Night	28% 17% 32% 19% 4	24058

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% 7% 9% 8% 4 4 5% 4 5% 20%	1516
	11th to 20th	Day	22% 16% 6% 9% 7% 3 4 3 4 5% 20%	1455
	21st to end	Day	15% 11% 7% 8% 8% 4 5% 4 5% 6% 25%	1748
February	1st to 10th	Day	20% 15% 5% 9% 7% 4 4 4 4 4 24%	1620
	11th to 20th	Day	18% 17% 5% 10% 6% 4 4 3 4 5% 24%	1573
	21st to end	Day	13% 16% 8% 7% 6% 3 4 3 3 6% 30%	1412
March	1st to 10th	Day	17% 16% 7% 8% 7% 3 5% 4 4 5% 24%	1889
	11th to 20th	Day	16% 14% 7% 11% 7% 4 4 3 3 5% 25%	1980
	21st to end	Day	17% 19% 8% 9% 5% 2 4 2 3 4 26%	2226
April	1st to 10th	Day	25% 17% 5% 7% 5% 2 4 3 4 4 23%	2160
	11th to 20th	Day	23% 13% 4 6% 5% 3 3 5% 4 6% 29%	2134
	21st to end	Day	26% 15% 3 6% 5% 3 4 4 4 5% 24%	2330
May	1st to 10th	Day	30% 11% 3 6% 6% 3 4 4 4 6% 22%	2477
	11th to 20th	Day	22% 13% 3 7% 5% 3 4 4 4 6% 29%	2478
	21st to end	Day	25% 11% 4 6% 4 2 4 4 5% 7% 28%	2724
June	1st to 10th	Day	29% 10% 4 6% 6% 3 4 4 5% 7% 21%	2520
	11th to 20th	Day	26% 8% 3 6% 5% 3 4 4 5% 6% 30%	2520
	21st to end	Day	31% 10% 3 7% 5% 3 5% 4 4 6% 23%	2520
July	1st to 10th	Day	20% 6% 3 6% 5% 3 6% 5% 6% 8% 31%	2520
	11th to 20th	Day	20% 8% 3 6% 5% 4 6% 5% 6% 8% 29%	2520
	21st to end	Day	26% 10% 4 6% 5% 3 6% 5% 5% 7% 25%	2745
August	1st to 10th	Day	21% 7% 2 6% 6% 3 5% 5% 6% 9% 30%	2355
	11th to 20th	Day	20% 8% 2 7% 5% 3 5% 6% 6% 7% 30%	2304
	21st to end	Day	18% 8% 3 6% 5% 3 4 4 5% 8% 37%	2422
September	1st to 10th	Day	21% 6% 3 6% 5% 3 4 4 6% 7% 36%	2160
	11th to 20th	Day	22% 8% 3 5% 5% 2 4 5% 5% 7% 35%	2160
	21st to end	Day	21% 8% 3 6% 5% 3 3 4 5% 6% 36%	1886
October	1st to 10th	Day	21% 7% 3 6% 5% 3 5% 4 5% 7% 34%	1800
	11th to 20th	Day	22% 9% 3 7% 5% 3 4 5% 6% 6% 30%	1800
	21st to end	Day	24% 12% 4 7% 6% 3 4 5% 4 7% 25%	1921
November	1st to 10th	Day	25% 11% 4 7% 4 3 4 4 4 5% 27%	1590
	11th to 20th	Day	23% 15% 4 8% 6% 3 3 4 5% 6% 25%	1520
	21st to end	Day	19% 16% 5% 6% 6% 3 5% 4 5% 8% 23%	1520
December	1st to 10th	Day	23% 16% 6% 8% 7% 3 4 4 3 4 22%	1520
	11th to 20th	Day	32% 13% 6% 7% 6% 2 3 4 3 4 20%	1906
	21st to end	Day	22% 12% 10% 13% 5% 2 3 4 4 5% 20%	2783
January	1st to 10th	Night	19% 14% 7% 9% 6% 3 4 5% 5% 6% 21%	2649
	11th to 20th	Night	22% 14% 7% 9% 6% 4 4 4 4 5% 21%	2545
	21st to end	Night	17% 11% 7% 10% 5% 3 5% 5% 5% 6% 26%	2606
February	1st to 10th	Night	20% 11% 4 10% 8% 4 5% 4 5% 4 24%	2340
	11th to 20th	Night	18% 15% 6% 9% 6% 3 5% 4 5% 6% 23%	2273
	21st to end	Night	12% 14% 7% 10% 8% 3 5% 6% 4 5% 26%	1844
March	1st to 10th	Night	16% 15% 6% 11% 8% 3 5% 4 4 6% 24%	2057
	11th to 20th	Night	20% 10% 5% 8% 6% 3 5% 4 6% 7% 27%	1979
	21st to end	Night	20% 13% 6% 8% 6% 3 4 3 3 6% 29%	2129
April	1st to 10th	Night	25% 15% 4 6% 6% 3 4 3 4 4 25%	1800
	11th to 20th	Night	22% 14% 3 5% 5% 2 4 4 4 6% 31%	1776
	21st to end	Night	27% 12% 3 6% 5% 2 3 4 5% 5% 26%	1627
May	1st to 10th	Night	28% 11% 5% 5% 5% 3 4 4 4 4 28%	1481
	11th to 20th	Night	23% 11% 3 6% 5% 2 4 4 5% 6% 32%	1416
	21st to end	Night	19% 11% 4 7% 5% 3 5% 4 6% 9% 28%	1550
June	1st to 10th	Night	30% 10% 4 6% 5% 3 2 3 5% 6% 26%	1440
	11th to 20th	Night	23% 10% 3 6% 4 3 4 3 4 5% 34%	1440
	21st to end	Night	28% 12% 3 6% 6% 3 3 4 4 5% 26%	1440
July	1st to 10th	Night	19% 8% 3 6% 3 3 5% 5% 6% 9% 32%	1440
	11th to 20th	Night	20% 7% 3 6% 5% 4 4 7% 7% 8% 28%	1440
	21st to end	Night	23% 9% 3 6% 6% 3 4 5% 5% 8% 27%	1573
August	1st to 10th	Night	18% 7% 3 6% 4 3 4 5% 4 7% 38%	1581
	11th to 20th	Night	19% 10% 3 6% 5% 3 6% 5% 4 9% 29%	1596
	21st to end	Night	19% 5% 2 4 6% 3 4 4 4 7% 41%	1934
September	1st to 10th	Night	17% 6% 3 5% 4 3 4 4 7% 8% 40%	1800
	11th to 20th	Night	22% 9% 2 5% 3 2 3 3 4 7% 40%	1800
	21st to end	Night	22% 8% 3 6% 5% 2 3 3 4 7% 37%	2070
October	1st to 10th	Night	21% 7% 3 5% 4 3 4 4 4 8% 37%	2160
	11th to 20th	Night	21% 8% 3 5% 5% 3 4 4 4 7% 35%	2160
	21st to end	Night	27% 11% 3 6% 5% 3 4 3 4 5% 27%	2434
November	1st to 10th	Night	24% 10% 3 6% 5% 3 4 4 5% 6% 30%	2485
	11th to 20th	Night	23% 10% 3 7% 6% 4 4 5% 6% 5% 27%	2660
	21st to end	Night	22% 12% 6% 7% 6% 3 4 4 4 6% 26%	2660
December	1st to 10th	Night	25% 14% 5% 9% 5% 3 4 4 3 5% 22%	2660
	11th to 20th	Night	34% 11% 4 6% 5% 3 3 4 4 4 22%	3293
	21st to end	Night	28% 13% 6% 11% 4 3 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	64% 6% 11% 12% 6% 1	1517
	11th to 20th	Day	65% 6% 10% 12% 7% 1	1455
	21st to end	Day	57% 6% 11% 15% 11% 1	1748
February	1st to 10th	Day	62% 5% 8% 13% 11% 1	1620
	11th to 20th	Day	62% 5% 10% 14% 8% 1	1581
	21st to end	Day	56% 4 9% 17% 11% 3	1412
March	1st to 10th	Day	61% 5% 7% 16% 10% 1	1893
	11th to 20th	Day	62% 4 10% 14% 8% 2	1980
	21st to end	Day	62% 5% 8% 14% 10% 2	2226
April	1st to 10th	Day	64% 5% 6% 13% 9% 3	2160
	11th to 20th	Day	55% 5% 10% 17% 12% 1	2134
	21st to end	Day	59% 6% 11% 16% 7% 1	2330
May	1st to 10th	Day	62% 6% 10% 14% 7% 1	2477
	11th to 20th	Day	57% 6% 10% 18% 8%	2482
	21st to end	Day	57% 7% 10% 18% 7% 1	2724
June	1st to 10th	Day	63% 6% 11% 14% 5%	2520
	11th to 20th	Day	55% 6% 11% 18% 9% 1	2520
	21st to end	Day	63% 6% 11% 12% 7% 1	2520
July	1st to 10th	Day	49% 8% 17% 18% 8%	2450
	11th to 20th	Day	51% 7% 17% 19% 6%	2444
	21st to end	Day	57% 8% 13% 17% 5% 1	2592
August	1st to 10th	Day	48% 8% 16% 20% 6%	2341
	11th to 20th	Day	49% 9% 17% 19% 6%	2304
	21st to end	Day	46% 6% 15% 23% 9% 1	2422
September	1st to 10th	Day	45% 8% 13% 21% 11% 1	2160
	11th to 20th	Day	48% 6% 11% 21% 12% 1	2160
	21st to end	Day	48% 6% 10% 23% 13% 1	1886
October	1st to 10th	Day	49% 5% 11% 23% 11% 1	1800
	11th to 20th	Day	51% 7% 15% 19% 7%	1800
	21st to end	Day	58% 5% 12% 17% 7%	1921
November	1st to 10th	Day	57% 6% 10% 18% 7%	1590
	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	61% 6% 12% 16% 5%	2649
	11th to 20th	Night	64% 6% 10% 13% 6% 1	2545
	21st to end	Night	56% 6% 14% 16% 8% 1	2606
February	1st to 10th	Night	61% 6% 9% 12% 10% 2	2340
	11th to 20th	Night	59% 6% 12% 13% 8% 2	2276
	21st to end	Night	57% 6% 10% 17% 8% 2	1844
March	1st to 10th	Night	60% 5% 10% 15% 9%	2066
	11th to 20th	Night	53% 7% 12% 17% 10% 2	1980
	21st to end	Night	56% 5% 10% 17% 9% 2	2129
April	1st to 10th	Night	61% 6% 8% 13% 9% 2	1800
	11th to 20th	Night	53% 6% 9% 19% 12% 2	1776
	21st to end	Night	57% 5% 11% 16% 10% 1	1627
May	1st to 10th	Night	59% 5% 10% 18% 7% 1	1481
	11th to 20th	Night	53% 6% 9% 21% 10%	1417
	21st to end	Night	54% 8% 15% 17% 6% 1	1551
June	1st to 10th	Night	60% 6% 11% 17% 6%	1440
	11th to 20th	Night	52% 5% 12% 17% 14%	1440
	21st to end	Night	62% 6% 10% 14% 7%	1440
July	1st to 10th	Night	48% 9% 18% 17% 7%	1401
	11th to 20th	Night	52% 8% 15% 17% 8%	1392
	21st to end	Night	56% 7% 15% 16% 5% 1	1486
August	1st to 10th	Night	46% 8% 18% 23% 5%	1570
	11th to 20th	Night	51% 9% 16% 18% 6%	1596
	21st to end	Night	44% 7% 15% 25% 9%	1934
September	1st to 10th	Night	40% 7% 15% 25% 11% 1	1800
	11th to 20th	Night	44% 6% 10% 25% 13% 1	1800
	21st to end	Night	48% 6% 10% 24% 10% 1	2070
October	1st to 10th	Night	45% 6% 13% 23% 12% 1	2160
	11th to 20th	Night	47% 6% 13% 26% 7%	2160
	21st to end	Night	57% 6% 10% 17% 10%	2434
November	1st to 10th	Night	53% 7% 12% 18% 9%	2485
	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	29% 23% 34% 9% 4	346
	21st to end	Day	25% 27% 35% 10% 2 1	374
February	1st to 10th	Day	34% 26% 28% 11% 1	340
	11th to 20th	Day	31% 33% 24% 10% 1	336
	21st to end	Day	26% 25% 33% 11% 4	280
March	1st to 10th	Day	26% 30% 32% 9% 2	382
	11th to 20th	Day	29% 30% 29% 9% 3	420
	21st to end	Day	31% 30% 25% 9% 3 1	462
April	1st to 10th	Day	39% 28% 24% 8% 1	420
	11th to 20th	Day	36% 26% 27% 9% 2	412
	21st to end	Day	30% 21% 32% 13% 2 1	420
May	1st to 10th	Day	36% 22% 28% 9% 3 1	560
	11th to 20th	Day	26% 21% 33% 15% 4 1	624
	21st to end	Day	33% 17% 32% 15% 2 1	680
June	1st to 10th	Day	38% 16% 27% 14% 5%	630
	11th to 20th	Day	27% 19% 33% 15% 4 1	630
	21st to end	Day	35% 12% 32% 16% 4 1	630
July	1st to 10th	Day	23% 14% 35% 23% 5%	620
	11th to 20th	Day	25% 10% 37% 22% 6%	618
	21st to end	Day	31% 11% 31% 21% 6%	685
August	1st to 10th	Day	19% 11% 38% 24% 7% 1	474
	11th to 20th	Day	24% 15% 32% 19% 8% 1	439
	21st to end	Day	22% 14% 33% 22% 8% 1	495
September	1st to 10th	Day	20% 17% 35% 20% 6% 2	450
	11th to 20th	Day	27% 20% 30% 16% 6% 1	450
	21st to end	Day	23% 20% 28% 21% 7% 1	394
October	1st to 10th	Day	24% 15% 33% 19% 6% 3	360
	11th to 20th	Day	22% 22% 31% 15% 8% 1	360
	21st to end	Day	29% 25% 30% 11% 5% 1	396
November	1st to 10th	Day	29% 21% 29% 16% 4 1	365
	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% 31% 14% 2	850
	11th to 20th	Night	31% 22% 31% 14% 2	809
	21st to end	Night	26% 26% 33% 14% 2	806
February	1st to 10th	Night	31% 21% 32% 16% 1	720
	11th to 20th	Night	28% 31% 28% 12% 1	703
	21st to end	Night	19% 26% 36% 15% 4	592
March	1st to 10th	Night	23% 26% 35% 13% 2	720
	11th to 20th	Night	25% 22% 28% 21% 4	720
	21st to end	Night	26% 22% 31% 18% 3	743
April	1st to 10th	Night	36% 20% 26% 16% 3	540
	11th to 20th	Night	31% 18% 33% 14% 4	534
	21st to end	Night	34% 13% 32% 17% 3 1	540
May	1st to 10th	Night	32% 16% 32% 15% 4 1	540
	11th to 20th	Night	30% 13% 30% 22% 5%	532
	21st to end	Night	25% 16% 39% 17% 3	583
June	1st to 10th	Night	34% 12% 34% 17% 3	540
	11th to 20th	Night	30% 10% 37% 20% 3	540
	21st to end	Night	36% 8% 30% 22% 4	540
July	1st to 10th	Night	23% 7% 40% 25% 5%	526
	11th to 20th	Night	23% 7% 35% 31% 4	522
	21st to end	Night	27% 8% 34% 25% 6%	590
August	1st to 10th	Night	21% 5% 34% 31% 9%	538
	11th to 20th	Night	23% 7% 33% 28% 9% 1	532
	21st to end	Night	21% 8% 28% 31% 11%	594
September	1st to 10th	Night	21% 7% 35% 29% 9%	540
	11th to 20th	Night	26% 11% 28% 25% 9%	540
	21st to end	Night	27% 13% 32% 22% 7%	698
October	1st to 10th	Night	23% 12% 32% 25% 7% 1	720
	11th to 20th	Night	26% 14% 31% 21% 7% 1	720
	21st to end	Night	32% 19% 28% 18% 3	821
November	1st to 10th	Night	30% 15% 32% 17% 4 2	830
	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 2024-01-09 17:24:25. Version ac07

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