Little Cypress
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Cypress clear sky chart from 2005-11-06 to 2025-12-03.

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	14% 6% 2 7% 5% 5% 5% 4 6% 8% 39%	126657
	Night	15% 7% 2 6% 4 4 4 3 5% 7% 44%	124265
Transparency	Day	41% 7% 12% 18% 16% 7%	130264
	Night	38% 6% 12% 19% 17% 8%	128735
Seeing	Day	14% 8% 21% 26% 21% 10%	16307
	Night	15% 6% 22% 31% 22% 4	26084

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	20% 9% 3 6% 4 3 3 3 4 4 41%	4077
	11th to 20th	Day	15% 6% 2 6% 4 3 3 2 3 5% 50%	4080
	21st to end	Day	27% 9% 2 6% 3 3 3 3 5% 5% 34%	4488
February	1st to 10th	Day	22% 8% 2 7% 4 4 4 3 5% 5% 36%	1800
	11th to 20th	Day	23% 9% 3 6% 4 3 4 2 3 4 38%	2029
	21st to end	Day	25% 10% 2 6% 4 3 3 3 4 5% 36%	1815
March	1st to 10th	Day	23% 8% 3 7% 4 4 4 3 4 6% 34%	4936
	11th to 20th	Day	16% 6% 3 7% 4 4 4 3 4 6% 43%	4980
	21st to end	Day	19% 8% 3 8% 5% 4 4 3 5% 5% 38%	5462
April	1st to 10th	Day	16% 7% 3 8% 6% 5% 4 3 5% 6% 38%	2273
	11th to 20th	Day	18% 7% 2 6% 5% 4 4 4 6% 6% 38%	2374
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 5% 5% 7% 42%	2400
May	1st to 10th	Day	19% 8% 3 8% 6% 5% 5% 4 7% 8% 27%	5405
	11th to 20th	Day	11% 5% 2 7% 5% 4 5% 4 5% 8% 44%	5536
	21st to end	Day	9% 6% 3 8% 6% 6% 6% 5% 8% 11% 33%	6434
June	1st to 10th	Day	7% 6% 2 7% 7% 6% 7% 6% 8% 11% 35%	2600
	11th to 20th	Day	6% 6% 2 6% 7% 7% 7% 6% 7% 10% 36%	2600
	21st to end	Day	7% 6% 2 8% 7% 8% 8% 6% 8% 10% 29%	2600
July	1st to 10th	Day	7% 6% 3 8% 6% 7% 7% 6% 9% 12% 29%	5900
	11th to 20th	Day	7% 6% 3 9% 7% 7% 7% 6% 8% 12% 27%	5900
	21st to end	Day	11% 7% 3 8% 6% 5% 6% 5% 7% 10% 31%	6422
August	1st to 10th	Day	2 2 1 4 4 5% 5% 4 8% 11% 54%	4175
	11th to 20th	Day	4 3 1 4 4 5% 7% 5% 8% 13% 45%	3849
	21st to end	Day	11% 6% 3 8% 6% 7% 6% 4 7% 8% 35%	4312
September	1st to 10th	Day	10% 6% 2 8% 5% 5% 6% 5% 7% 9% 36%	2400
	11th to 20th	Day	14% 6% 2 7% 5% 6% 6% 4 7% 8% 35%	2203
	21st to end	Day	11% 5% 1 6% 5% 5% 5% 4 6% 8% 44%	2170
October	1st to 10th	Day	7% 4 2 5% 4 4 4 4 5% 7% 55%	2000
	11th to 20th	Day	9% 5% 2 5% 4 3 4 4 5% 7% 53%	2000
	21st to end	Day	12% 4 2 5% 3 4 3 3 4 6% 53%	2200
November	1st to 10th	Day	13% 5% 2 5% 4 4 6% 3 4 6% 48%	2058
	11th to 20th	Day	12% 7% 2 6% 3 3 4 3 5% 6% 51%	2100
	21st to end	Day	15% 7% 2 7% 4 4 3 3 4 6% 45%	2100
December	1st to 10th	Day	22% 10% 2 6% 4 3 3 3 4 6% 39%	3100
	11th to 20th	Day	16% 9% 3 7% 4 4 4 3 4 6% 41%	3391
	21st to end	Day	18% 6% 2 6% 3 3 3 3 4 6% 47%	4488
January	1st to 10th	Night	18% 7% 2 6% 3 3 3 3 4 6% 45%	5888
	11th to 20th	Night	19% 8% 2 5% 3 3 2 2 3 4 47%	5900
	21st to end	Night	29% 9% 3 6% 4 3 3 3 4 6% 32%	6490
February	1st to 10th	Night	20% 9% 3 6% 4 4 3 3 4 6% 39%	2600
	11th to 20th	Night	22% 9% 3 5% 3 3 3 3 4 5% 41%	2271
	21st to end	Night	22% 10% 2 6% 4 3 4 2 4 6% 36%	1815
March	1st to 10th	Night	23% 11% 3 6% 3 3 3 2 4 5% 37%	4919
	11th to 20th	Night	23% 8% 2 6% 4 3 3 2 4 5% 41%	4980
	21st to end	Night	20% 8% 2 5% 4 4 4 3 4 5% 41%	5467
April	1st to 10th	Night	18% 6% 3 6% 5% 3 4 4 5% 7% 40%	2125
	11th to 20th	Night	18% 5% 2 5% 3 3 3 3 6% 8% 45%	1975
	21st to end	Night	13% 6% 3 5% 4 4 4 3 6% 7% 45%	2000
May	1st to 10th	Night	26% 9% 3 7% 5% 4 4 4 6% 8% 26%	4490
	11th to 20th	Night	17% 6% 2 7% 4 3 4 3 5% 8% 40%	4359
	21st to end	Night	15% 7% 3 7% 5% 4 5% 5% 7% 10% 33%	4443
June	1st to 10th	Night	5% 3 2 5% 4 4 5% 4 7% 10% 53%	1800
	11th to 20th	Night	6% 4 2 4 4 4 4 4 7% 13% 50%	1800
	21st to end	Night	7% 4 1 6% 4 5% 5% 5% 8% 11% 43%	1800
July	1st to 10th	Night	4 5% 2 7% 5% 5% 5% 5% 8% 14% 42%	4078
	11th to 20th	Night	3 4 2 7% 4 6% 6% 5% 8% 11% 44%	4077
	21st to end	Night	7% 6% 3 8% 5% 5% 5% 4 6% 10% 42%	4449
August	1st to 10th	Night	2 1 1 3 2 3 4 3 5% 10% 66%	2979
	11th to 20th	Night	2 2 3 2 3 4 4 7% 12% 60%	3200
	21st to end	Night	7% 5% 2 6% 5% 5% 6% 6% 8% 9% 42%	3586
September	1st to 10th	Night	7% 5% 2 5% 4 4 5% 4 7% 11% 45%	2000
	11th to 20th	Night	12% 5% 2 6% 5% 4 4 4 7% 9% 42%	2190
	21st to end	Night	9% 4 1 5% 4 4 3 3 4 6% 57%	2210
October	1st to 10th	Night	6% 4 1 4 4 3 4 4 5% 7% 58%	2400
	11th to 20th	Night	9% 3 2 4 3 3 3 3 5% 7% 60%	2400
	21st to end	Night	11% 4 2 4 2 2 3 2 3 5% 60%	2640
November	1st to 10th	Night	10% 6% 2 5% 4 3 4 3 5% 6% 52%	2460
	11th to 20th	Night	11% 5% 2 5% 3 3 3 3 4 6% 56%	2520
	21st to end	Night	13% 6% 3 7% 5% 4 3 3 5% 6% 45%	2520
December	1st to 10th	Night	21% 9% 3 8% 4 4 3 3 5% 6% 35%	4128
	11th to 20th	Night	15% 11% 3 7% 3 3 3 2 4 5% 42%	4816
	21st to end	Night	17% 8% 2 6% 4 3 3 3 4 4 46%	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	47% 4 5% 20% 18% 6%	4078
	11th to 20th	Day	38% 3 5% 15% 28% 11%	4080
	21st to end	Day	53% 3 5% 14% 15% 11%	4488
February	1st to 10th	Day	50% 4 7% 13% 16% 10%	1800
	11th to 20th	Day	50% 4 6% 14% 17% 9%	2039
	21st to end	Day	51% 5% 7% 13% 16% 8%	1815
March	1st to 10th	Day	51% 5% 7% 10% 16% 10%	4936
	11th to 20th	Day	41% 6% 7% 11% 20% 15%	4980
	21st to end	Day	47% 5% 8% 19% 18% 4	5464
April	1st to 10th	Day	45% 7% 8% 15% 16% 9%	2273
	11th to 20th	Day	43% 6% 10% 16% 16% 9%	2374
	21st to end	Day	39% 7% 11% 17% 21% 5%	2400
May	1st to 10th	Day	52% 8% 10% 19% 9% 3	5440
	11th to 20th	Day	38% 6% 15% 21% 19% 2	5540
	21st to end	Day	40% 10% 14% 25% 10% 1	6447
June	1st to 10th	Day	39% 11% 15% 21% 14% 1	2600
	11th to 20th	Day	38% 9% 15% 23% 13% 2	2600
	21st to end	Day	43% 12% 19% 19% 7%	2600
July	1st to 10th	Day	43% 8% 28% 18% 2	5836
	11th to 20th	Day	46% 9% 26% 17% 2	5831
	21st to end	Day	45% 9% 18% 24% 4	6240
August	1st to 10th	Day	21% 9% 14% 36% 20%	4161
	11th to 20th	Day	28% 11% 29% 28% 4	3885
	21st to end	Day	45% 10% 13% 16% 15% 1	4311
September	1st to 10th	Day	41% 11% 14% 16% 14% 4	2400
	11th to 20th	Day	44% 8% 13% 17% 14% 4	2203
	21st to end	Day	35% 8% 12% 20% 16% 10%	2170
October	1st to 10th	Day	23% 4 6% 13% 19% 35%	3260
	11th to 20th	Day	19% 3 4 20% 33% 20%	3240
	21st to end	Day	25% 4 5% 12% 41% 13%	3538
November	1st to 10th	Day	36% 6% 9% 18% 20% 11%	2058
	11th to 20th	Day	34% 5% 7% 18% 23% 13%	2100
	21st to end	Day	41% 5% 7% 19% 21% 8%	2100
December	1st to 10th	Day	47% 4 6% 16% 22% 5%	3100
	11th to 20th	Day	44% 4 7% 13% 21% 11%	3389
	21st to end	Day	40% 4 6% 16% 24% 10%	4488
January	1st to 10th	Night	41% 3 6% 21% 22% 7%	5888
	11th to 20th	Night	42% 2 4 16% 26% 10%	5900
	21st to end	Night	55% 3 5% 12% 14% 11%	6490
February	1st to 10th	Night	48% 4 7% 11% 19% 12%	2600
	11th to 20th	Night	47% 4 6% 16% 19% 9%	2272
	21st to end	Night	49% 5% 8% 13% 14% 12%	1815
March	1st to 10th	Night	49% 4 7% 13% 16% 11%	4919
	11th to 20th	Night	46% 6% 6% 12% 14% 16%	4980
	21st to end	Night	46% 4 9% 15% 20% 7%	5467
April	1st to 10th	Night	43% 6% 9% 17% 15% 9%	2125
	11th to 20th	Night	36% 5% 13% 19% 16% 13%	1975
	21st to end	Night	37% 4 12% 21% 21% 6%	2000
May	1st to 10th	Night	54% 7% 11% 16% 9% 3	4520
	11th to 20th	Night	42% 6% 13% 18% 19% 2	4360
	21st to end	Night	42% 8% 19% 22% 8% 1	4452
June	1st to 10th	Night	25% 10% 19% 31% 15% 1	1800
	11th to 20th	Night	25% 8% 19% 31% 14% 2	1800
	21st to end	Night	31% 10% 26% 25% 8%	1800
July	1st to 10th	Night	33% 6% 39% 19% 2	4035
	11th to 20th	Night	32% 8% 35% 23% 2	4026
	21st to end	Night	38% 9% 19% 28% 6%	4320
August	1st to 10th	Night	14% 6% 20% 41% 19%	2969
	11th to 20th	Night	16% 8% 36% 34% 6%	3230
	21st to end	Night	35% 12% 18% 19% 13% 1	3586
September	1st to 10th	Night	31% 10% 22% 20% 13% 4	2000
	11th to 20th	Night	37% 8% 17% 19% 15% 4	2190
	21st to end	Night	28% 6% 13% 23% 18% 12%	2210
October	1st to 10th	Night	19% 4 7% 16% 18% 36%	3920
	11th to 20th	Night	15% 3 6% 24% 31% 21%	3899
	21st to end	Night	22% 3 4 13% 40% 17%	4252
November	1st to 10th	Night	32% 5% 10% 18% 22% 12%	2460
	11th to 20th	Night	30% 4 9% 20% 25% 13%	2520
	21st to end	Night	40% 4 9% 18% 19% 11%	2520
December	1st to 10th	Night	52% 3 6% 16% 17% 6%	4128
	11th to 20th	Night	45% 3 7% 13% 21% 12%	4817
	21st to end	Night	41% 5% 6% 15% 25% 8%	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	26% 15% 40% 13% 6% 1	300
	11th to 20th	Day	21% 18% 36% 19% 5% 1	300
	21st to end	Day	24% 24% 33% 16% 3	330
February	1st to 10th	Day	27% 19% 32% 17% 4 1	300
	11th to 20th	Day	36% 18% 29% 15% 2	300
	21st to end	Day	31% 23% 34% 9% 2	249
March	1st to 10th	Day	28% 21% 33% 17% 2	300
	11th to 20th	Day	17% 28% 39% 12% 3 1	300
	21st to end	Day	22% 19% 36% 18% 4	330
April	1st to 10th	Day	18% 21% 33% 23% 5%	373
	11th to 20th	Day	21% 18% 28% 21% 11% 1	492
	21st to end	Day	16% 10% 34% 26% 11% 1	500
May	1st to 10th	Day	17% 13% 31% 25% 13% 1	503
	11th to 20th	Day	14% 7% 27% 32% 17% 3	581
	21st to end	Day	9% 7% 28% 34% 17% 5%	789
June	1st to 10th	Day	8% 3 16% 35% 28% 11%	730
	11th to 20th	Day	7% 2 17% 37% 28% 9%	730
	21st to end	Day	8% 3 12% 29% 30% 17%	730
July	1st to 10th	Day	7% 2 7% 29% 34% 20%	721
	11th to 20th	Day	8% 2 7% 26% 35% 23%	718
	21st to end	Day	9% 1 5% 27% 37% 21%	794
August	1st to 10th	Day	5% 1 3 25% 42% 24%	693
	11th to 20th	Day	6% 1 2 16% 45% 31%	519
	21st to end	Day	13% 2 5% 22% 34% 23%	583
September	1st to 10th	Day	10% 2 6% 25% 38% 19%	530
	11th to 20th	Day	11% 2 11% 28% 34% 14%	333
	21st to end	Day	13% 1 14% 29% 35% 7%	330
October	1st to 10th	Day	7% 4 17% 45% 19% 8%	330
	11th to 20th	Day	10% 5% 21% 38% 17% 9%	330
	21st to end	Day	16% 10% 26% 29% 13% 4	363
November	1st to 10th	Day	18% 5% 26% 28% 19% 3	330
	11th to 20th	Day	13% 10% 33% 33% 11% 1	330
	21st to end	Day	17% 21% 31% 23% 7% 2	330
December	1st to 10th	Day	21% 10% 36% 19% 11% 3	306
	11th to 20th	Day	20% 13% 40% 23% 4 1	300
	21st to end	Day	21% 18% 36% 17% 5% 3	330
January	1st to 10th	Night	23% 9% 33% 28% 7%	1000
	11th to 20th	Night	22% 10% 32% 28% 7%	1000
	21st to end	Night	25% 9% 31% 29% 6%	1100
February	1st to 10th	Night	23% 12% 33% 28% 4	1000
	11th to 20th	Night	29% 11% 29% 25% 5%	716
	21st to end	Night	24% 13% 34% 26% 2	495
March	1st to 10th	Night	24% 11% 30% 30% 6%	600
	11th to 20th	Night	20% 11% 34% 30% 6%	600
	21st to end	Night	20% 8% 34% 28% 9%	660
April	1st to 10th	Night	20% 10% 34% 30% 7%	600
	11th to 20th	Night	19% 10% 28% 32% 10%	593
	21st to end	Night	15% 8% 35% 32% 10% 1	600
May	1st to 10th	Night	16% 8% 28% 37% 11%	600
	11th to 20th	Night	14% 5% 25% 38% 18% 1	591
	21st to end	Night	8% 5% 22% 37% 25% 4	650
June	1st to 10th	Night	6% 2 9% 39% 40% 5%	600
	11th to 20th	Night	6% 1 11% 39% 39% 4	600
	21st to end	Night	8% 2 8% 30% 42% 10%	600
July	1st to 10th	Night	5% 1 3 30% 47% 13%	585
	11th to 20th	Night	4 1 4 25% 50% 17%	582
	21st to end	Night	4 5% 28% 49% 14%	657
August	1st to 10th	Night	3 1 2 24% 57% 15%	597
	11th to 20th	Night	5% 1 20% 55% 18%	594
	21st to end	Night	8% 2 4 22% 49% 15%	660
September	1st to 10th	Night	8% 2 6% 26% 48% 11%	600
	11th to 20th	Night	12% 1 6% 24% 50% 8%	600
	21st to end	Night	9% 1 8% 33% 41% 7%	610
October	1st to 10th	Night	6% 2 14% 36% 38% 5%	800
	11th to 20th	Night	9% 4 20% 39% 25% 3	800
	21st to end	Night	13% 7% 20% 37% 20% 3	880
November	1st to 10th	Night	12% 5% 21% 35% 25% 2	820
	11th to 20th	Night	12% 8% 25% 40% 15%	840
	21st to end	Night	16% 8% 31% 30% 14% 1	840
December	1st to 10th	Night	23% 8% 28% 28% 12%	914
	11th to 20th	Night	23% 10% 29% 30% 8%	1000
	21st to end	Night	21% 11% 32% 29% 8%	1100

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