Kisatchie Star Party
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kisatchie Star Party clear sky chart from 2005-11-06 to 2025-10-04.

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	12% 7% 3 6% 5% 5% 4 4 6% 7% 42%	126076
	Night	12% 7% 2 6% 4 4 4 3 5% 7% 46%	123502
Transparency	Day	39% 6% 11% 19% 18% 7%	129683
	Night	36% 6% 11% 19% 19% 9%	127972
Seeing	Day	14% 8% 22% 25% 22% 8%	16279
	Night	15% 8% 25% 31% 18% 3	25975

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	17% 9% 3 6% 3 3 3 3 3 4 45%	4077
	11th to 20th	Day	14% 7% 2 5% 4 3 3 3 4 6% 50%	4080
	21st to end	Day	22% 11% 3 6% 4 3 3 2 3 5% 40%	4488
February	1st to 10th	Day	17% 9% 4 6% 5% 4 4 3 4 5% 38%	1800
	11th to 20th	Day	20% 9% 3 6% 5% 3 3 3 3 5% 41%	1952
	21st to end	Day	19% 8% 3 7% 5% 4 4 3 4 5% 37%	1815
March	1st to 10th	Day	18% 12% 4 8% 5% 4 4 3 3 5% 36%	4936
	11th to 20th	Day	14% 6% 2 6% 4 4 3 3 5% 5% 47%	4980
	21st to end	Day	14% 10% 4 8% 5% 4 4 3 4 6% 41%	5462
April	1st to 10th	Day	13% 7% 2 6% 5% 5% 5% 4 5% 6% 41%	2325
	11th to 20th	Day	17% 6% 3 6% 5% 4 4 3 5% 7% 41%	2374
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 5% 7% 43%	2400
May	1st to 10th	Day	16% 8% 4 8% 5% 5% 5% 4 6% 7% 32%	5405
	11th to 20th	Day	11% 6% 3 6% 6% 5% 5% 4 6% 8% 39%	5557
	21st to end	Day	9% 5% 2 7% 5% 6% 5% 5% 7% 10% 38%	6434
June	1st to 10th	Day	7% 6% 2 6% 7% 6% 6% 6% 8% 9% 38%	2600
	11th to 20th	Day	6% 4 2 6% 7% 6% 7% 5% 8% 10% 39%	2600
	21st to end	Day	6% 5% 2 6% 6% 7% 8% 7% 8% 11% 35%	2600
July	1st to 10th	Day	7% 5% 3 9% 6% 7% 6% 6% 9% 11% 31%	5900
	11th to 20th	Day	6% 6% 3 7% 6% 6% 6% 5% 7% 10% 37%	5900
	21st to end	Day	11% 8% 3 7% 5% 5% 6% 4 7% 9% 35%	6422
August	1st to 10th	Day	3 2 1 4 4 4 4 4 6% 8% 60%	4170
	11th to 20th	Day	4 3 1 4 4 4 5% 4 8% 12% 51%	3849
	21st to end	Day	11% 5% 2 7% 5% 6% 5% 6% 6% 8% 38%	4312
September	1st to 10th	Day	9% 6% 2 7% 5% 6% 5% 5% 6% 7% 42%	2400
	11th to 20th	Day	14% 6% 2 5% 4 5% 6% 4 6% 8% 41%	2300
	21st to end	Day	10% 3 2 5% 4 4 5% 4 6% 7% 50%	2130
October	1st to 10th	Day	6% 5% 1 4 5% 3 3 3 4 5% 60%	1930
	11th to 20th	Day	11% 5% 1 5% 3 4 3 3 5% 6% 55%	1900
	21st to end	Day	14% 6% 2 5% 4 3 3 3 3 5% 52%	2090
November	1st to 10th	Day	12% 6% 3 5% 4 4 3 4 4 5% 49%	1958
	11th to 20th	Day	12% 6% 2 5% 4 3 3 3 4 5% 53%	2000
	21st to end	Day	16% 7% 2 6% 4 3 4 4 4 5% 46%	2000
December	1st to 10th	Day	18% 8% 2 5% 4 3 4 3 4 5% 45%	3051
	11th to 20th	Day	14% 11% 3 7% 5% 4 4 3 5% 5% 39%	3391
	21st to end	Day	15% 8% 2 6% 4 3 3 2 4 5% 47%	4488
January	1st to 10th	Night	16% 6% 3 5% 3 3 3 3 3 5% 52%	5888
	11th to 20th	Night	14% 9% 2 5% 3 3 3 4 3 4 50%	5900
	21st to end	Night	24% 11% 3 5% 4 3 2 2 3 4 38%	6490
February	1st to 10th	Night	15% 9% 3 6% 4 3 4 3 5% 6% 43%	2600
	11th to 20th	Night	21% 9% 2 5% 4 2 3 3 4 5% 43%	2347
	21st to end	Night	19% 9% 3 6% 3 3 4 3 4 6% 40%	1815
March	1st to 10th	Night	19% 10% 3 6% 4 4 4 3 4 6% 38%	4919
	11th to 20th	Night	15% 6% 2 5% 4 4 4 3 4 6% 46%	4980
	21st to end	Night	16% 8% 3 7% 4 4 4 4 4 5% 42%	5467
April	1st to 10th	Night	12% 6% 2 5% 5% 4 4 4 5% 8% 45%	2075
	11th to 20th	Night	13% 7% 2 5% 4 4 5% 3 5% 6% 46%	1975
	21st to end	Night	9% 6% 2 5% 4 4 4 4 6% 6% 50%	2000
May	1st to 10th	Night	15% 8% 3 8% 5% 4 4 4 6% 8% 35%	4490
	11th to 20th	Night	14% 7% 2 7% 5% 4 5% 4 6% 7% 39%	4326
	21st to end	Night	9% 6% 2 7% 4 5% 4 4 7% 12% 39%	4443
June	1st to 10th	Night	5% 4 2 6% 4 4 5% 4 6% 11% 49%	1800
	11th to 20th	Night	4 3 2 4 4 3 4 4 8% 11% 54%	1800
	21st to end	Night	6% 4 1 4 4 4 4 4 8% 12% 49%	1800
July	1st to 10th	Night	6% 5% 3 7% 5% 6% 6% 5% 9% 13% 36%	4078
	11th to 20th	Night	5% 5% 2 6% 5% 5% 5% 5% 8% 13% 42%	4077
	21st to end	Night	10% 7% 3 7% 5% 5% 4 4 7% 9% 40%	4449
August	1st to 10th	Night	2 2 1 2 2 2 3 3 5% 10% 68%	2984
	11th to 20th	Night	2 3 1 4 3 3 5% 5% 7% 14% 53%	3200
	21st to end	Night	7% 6% 2 7% 6% 5% 5% 4 6% 8% 43%	3586
September	1st to 10th	Night	7% 5% 2 5% 5% 5% 4 4 7% 9% 49%	2000
	11th to 20th	Night	11% 5% 2 6% 4 4 4 4 5% 7% 47%	2094
	21st to end	Night	9% 4 2 4 3 2 4 3 4 6% 57%	2250
October	1st to 10th	Night	6% 3 1 4 3 3 4 3 5% 7% 61%	2317
	11th to 20th	Night	9% 4 2 4 3 3 3 3 4 5% 58%	2280
	21st to end	Night	11% 4 1 5% 3 2 3 2 4 5% 59%	2508
November	1st to 10th	Night	11% 6% 2 5% 3 2 3 3 4 5% 54%	2340
	11th to 20th	Night	10% 5% 2 5% 4 4 4 3 5% 5% 54%	2400
	21st to end	Night	15% 7% 2 7% 4 4 4 3 4 6% 45%	2400
December	1st to 10th	Night	19% 9% 2 6% 4 4 3 3 4 5% 41%	4118
	11th to 20th	Night	14% 10% 3 6% 4 4 4 3 4 4 45%	4816
	21st to end	Night	13% 9% 2 5% 3 3 3 3 4 5% 49%	6490

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	43% 4 5% 24% 21% 4	4078
	11th to 20th	Day	37% 4 3 19% 26% 11%	4080
	21st to end	Day	50% 3 3 12% 19% 13%	4488
February	1st to 10th	Day	48% 5% 5% 13% 18% 11%	1800
	11th to 20th	Day	49% 3 6% 16% 17% 9%	1962
	21st to end	Day	50% 5% 7% 11% 17% 11%	1815
March	1st to 10th	Day	52% 4 6% 11% 17% 11%	4936
	11th to 20th	Day	38% 5% 6% 15% 21% 16%	4980
	21st to end	Day	46% 4 9% 19% 17% 6%	5464
April	1st to 10th	Day	42% 7% 9% 19% 16% 8%	2325
	11th to 20th	Day	43% 5% 10% 16% 18% 9%	2374
	21st to end	Day	39% 7% 10% 20% 20% 5%	2400
May	1st to 10th	Day	49% 7% 10% 21% 10% 3	5440
	11th to 20th	Day	41% 6% 16% 18% 18% 1	5561
	21st to end	Day	39% 8% 13% 24% 14% 2	6447
June	1st to 10th	Day	38% 10% 16% 20% 15% 1	2600
	11th to 20th	Day	36% 10% 14% 23% 15% 2	2600
	21st to end	Day	39% 11% 17% 21% 11% 1	2600
July	1st to 10th	Day	44% 9% 24% 19% 4	5836
	11th to 20th	Day	40% 8% 20% 26% 5%	5831
	21st to end	Day	44% 7% 15% 26% 7%	6240
August	1st to 10th	Day	21% 7% 14% 32% 26% 1	4156
	11th to 20th	Day	25% 8% 22% 36% 8% 1	3885
	21st to end	Day	41% 7% 15% 18% 18% 1	4311
September	1st to 10th	Day	38% 10% 14% 18% 15% 6%	2400
	11th to 20th	Day	39% 8% 13% 16% 18% 6%	2300
	21st to end	Day	33% 6% 10% 22% 20% 10%	2130
October	1st to 10th	Day	18% 4 5% 14% 23% 36%	3190
	11th to 20th	Day	19% 3 5% 16% 31% 26%	3140
	21st to end	Day	27% 3 4 13% 38% 16%	3428
November	1st to 10th	Day	36% 5% 8% 17% 24% 10%	1958
	11th to 20th	Day	34% 4 6% 14% 29% 14%	2000
	21st to end	Day	42% 4 8% 16% 22% 9%	2000
December	1st to 10th	Day	43% 4 7% 17% 24% 6%	3051
	11th to 20th	Day	47% 4 6% 11% 22% 10%	3389
	21st to end	Day	40% 3 6% 16% 31% 4	4488
January	1st to 10th	Night	36% 4 6% 23% 27% 5%	5888
	11th to 20th	Night	39% 4 5% 17% 27% 9%	5900
	21st to end	Night	52% 3 5% 13% 16% 12%	6490
February	1st to 10th	Night	43% 4 7% 17% 18% 11%	2600
	11th to 20th	Night	45% 4 6% 17% 19% 9%	2348
	21st to end	Night	47% 5% 7% 12% 15% 14%	1815
March	1st to 10th	Night	47% 5% 6% 11% 20% 11%	4919
	11th to 20th	Night	39% 6% 6% 14% 17% 18%	4980
	21st to end	Night	43% 6% 8% 16% 21% 7%	5467
April	1st to 10th	Night	37% 6% 11% 20% 16% 10%	2075
	11th to 20th	Night	39% 6% 9% 17% 18% 11%	1975
	21st to end	Night	33% 6% 11% 20% 24% 6%	2000
May	1st to 10th	Night	45% 8% 13% 19% 13% 3	4520
	11th to 20th	Night	42% 7% 13% 18% 18% 2	4327
	21st to end	Night	37% 9% 18% 23% 12% 1	4452
June	1st to 10th	Night	28% 9% 19% 24% 19% 1	1800
	11th to 20th	Night	23% 9% 20% 32% 14% 3	1800
	21st to end	Night	27% 9% 20% 29% 14% 1	1800
July	1st to 10th	Night	38% 8% 31% 19% 4	4035
	11th to 20th	Night	31% 9% 31% 24% 5%	4026
	21st to end	Night	40% 8% 19% 25% 7% 1	4320
August	1st to 10th	Night	12% 6% 18% 35% 28% 1	2974
	11th to 20th	Night	21% 7% 26% 37% 8% 1	3230
	21st to end	Night	38% 9% 15% 18% 17% 2	3586
September	1st to 10th	Night	30% 10% 18% 20% 15% 8%	2000
	11th to 20th	Night	36% 8% 12% 19% 17% 8%	2094
	21st to end	Night	27% 6% 11% 22% 21% 13%	2250
October	1st to 10th	Night	17% 4 7% 14% 21% 37%	3837
	11th to 20th	Night	17% 3 5% 18% 30% 28%	3779
	21st to end	Night	21% 3 6% 15% 36% 19%	4120
November	1st to 10th	Night	32% 4 9% 17% 25% 12%	2340
	11th to 20th	Night	31% 5% 9% 15% 25% 15%	2400
	21st to end	Night	41% 4 7% 15% 23% 10%	2400
December	1st to 10th	Night	46% 4 6% 14% 26% 4	4118
	11th to 20th	Night	43% 3 8% 13% 23% 10%	4817
	21st to end	Night	38% 4 7% 17% 28% 7%	6490

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	23% 19% 41% 13% 3 1	300
	11th to 20th	Day	24% 20% 37% 14% 5%	300
	21st to end	Day	30% 19% 32% 16% 2	330
February	1st to 10th	Day	24% 17% 39% 15% 5% 1	300
	11th to 20th	Day	35% 17% 33% 13% 1	300
	21st to end	Day	31% 23% 33% 11% 2	249
March	1st to 10th	Day	27% 18% 34% 16% 5%	300
	11th to 20th	Day	20% 22% 37% 18% 3	300
	21st to end	Day	17% 24% 38% 17% 3 1	330
April	1st to 10th	Day	22% 16% 35% 21% 5%	425
	11th to 20th	Day	25% 13% 29% 21% 10% 1	492
	21st to end	Day	15% 12% 33% 28% 10% 2	500
May	1st to 10th	Day	17% 12% 34% 26% 11% 1	503
	11th to 20th	Day	15% 7% 27% 29% 17% 5%	589
	21st to end	Day	9% 5% 28% 33% 20% 6%	789
June	1st to 10th	Day	9% 3 17% 36% 26% 10%	730
	11th to 20th	Day	8% 3 16% 38% 28% 8%	730
	21st to end	Day	7% 2 12% 28% 36% 15%	730
July	1st to 10th	Day	8% 2 11% 28% 38% 13%	721
	11th to 20th	Day	7% 2 5% 27% 44% 15%	718
	21st to end	Day	9% 1 6% 28% 43% 13%	794
August	1st to 10th	Day	5% 1 6% 24% 44% 20%	688
	11th to 20th	Day	6% 2 4 21% 46% 21%	519
	21st to end	Day	13% 2 7% 21% 36% 22%	583
September	1st to 10th	Day	9% 2 9% 26% 39% 15%	530
	11th to 20th	Day	12% 3 9% 25% 35% 16%	430
	21st to end	Day	12% 3 13% 32% 29% 11%	330
October	1st to 10th	Day	8% 3 19% 43% 22% 6%	309
	11th to 20th	Day	9% 5% 33% 26% 21% 6%	300
	21st to end	Day	21% 8% 29% 25% 11% 5%	330
November	1st to 10th	Day	17% 11% 26% 32% 12% 3	300
	11th to 20th	Day	15% 12% 37% 26% 8% 2	300
	21st to end	Day	19% 17% 35% 20% 6% 2	300
December	1st to 10th	Day	20% 13% 37% 21% 7% 3	300
	11th to 20th	Day	23% 14% 36% 22% 5%	300
	21st to end	Day	23% 16% 38% 18% 4 1	330
January	1st to 10th	Night	21% 13% 36% 24% 6%	1000
	11th to 20th	Night	21% 15% 33% 24% 7%	1000
	21st to end	Night	25% 12% 34% 26% 3	1100
February	1st to 10th	Night	21% 14% 35% 27% 3	1000
	11th to 20th	Night	25% 17% 33% 22% 3	792
	21st to end	Night	24% 18% 35% 21% 3	495
March	1st to 10th	Night	22% 12% 33% 28% 5%	600
	11th to 20th	Night	20% 13% 33% 28% 5% 1	600
	21st to end	Night	18% 9% 41% 25% 7%	660
April	1st to 10th	Night	16% 11% 41% 26% 6%	600
	11th to 20th	Night	17% 13% 35% 24% 11%	593
	21st to end	Night	12% 11% 38% 30% 10% 1	600
May	1st to 10th	Night	14% 9% 35% 32% 10% 1	600
	11th to 20th	Night	12% 7% 29% 33% 17% 3	591
	21st to end	Night	7% 4 26% 38% 22% 4	650
June	1st to 10th	Night	7% 2 16% 42% 31% 4	600
	11th to 20th	Night	5% 3 17% 46% 27% 3	600
	21st to end	Night	7% 2 10% 38% 36% 7%	600
July	1st to 10th	Night	6% 1 8% 41% 36% 9%	585
	11th to 20th	Night	5% 1 6% 40% 38% 10%	582
	21st to end	Night	7% 1 6% 39% 39% 8%	657
August	1st to 10th	Night	3 1 5% 36% 46% 10%	597
	11th to 20th	Night	5% 1 7% 37% 42% 9%	594
	21st to end	Night	10% 2 9% 29% 39% 11%	660
September	1st to 10th	Night	8% 1 8% 34% 42% 8%	600
	11th to 20th	Night	12% 2 9% 27% 42% 8%	600
	21st to end	Night	12% 2 11% 33% 37% 5%	650
October	1st to 10th	Night	8% 2 14% 40% 31% 6%	773
	11th to 20th	Night	11% 6% 23% 38% 19% 3	760
	21st to end	Night	14% 7% 23% 36% 17% 2	836
November	1st to 10th	Night	13% 6% 26% 33% 20% 2	780
	11th to 20th	Night	13% 9% 27% 37% 14%	800
	21st to end	Night	18% 11% 31% 27% 12% 1	800
December	1st to 10th	Night	23% 11% 28% 29% 9%	920
	11th to 20th	Night	24% 11% 29% 30% 6% 1	1000
	21st to end	Night	22% 13% 29% 31% 6%	1100

Page generated at 2025-10-01 00:39:04. Version ac07

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