Lake Hudson State Recreational Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Hudson State Recreational Area clear sky chart from 2005-11-06 to 2025-08-05.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	125454
	Night	14% 10% 4 8% 5% 4 4 4 5% 7% 34%	122725
Transparency	Day	46% 8% 12% 20% 12% 1	129025
	Night	46% 7% 12% 20% 13% 1	127212
Seeing	Day	17% 11% 29% 24% 14% 6%	16681
	Night	18% 10% 30% 28% 13% 1	26488

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	13% 14% 7% 18% 7% 5% 5% 4 4 6% 18%	3617
	11th to 20th	Day	13% 14% 5% 15% 10% 6% 8% 5% 6% 5% 14%	3620
	21st to end	Day	19% 17% 7% 15% 6% 5% 4 3 4 4 17%	4310
February	1st to 10th	Day	14% 14% 5% 9% 8% 7% 5% 4 6% 6% 21%	1812
	11th to 20th	Day	15% 11% 4 10% 8% 7% 5% 4 5% 6% 25%	1948
	21st to end	Day	16% 13% 5% 10% 5% 4 4 4 6% 7% 27%	1650
March	1st to 10th	Day	15% 11% 4 12% 6% 5% 5% 3 4 5% 29%	4514
	11th to 20th	Day	11% 11% 3 8% 5% 4 5% 4 5% 7% 37%	4980
	21st to end	Day	18% 15% 5% 9% 5% 4 5% 4 5% 6% 25%	5465
April	1st to 10th	Day	16% 12% 3 8% 5% 5% 5% 4 6% 7% 29%	2376
	11th to 20th	Day	17% 8% 3 7% 5% 4 6% 4 5% 7% 34%	2483
	21st to end	Day	17% 9% 3 8% 4 4 4 3 6% 8% 34%	2600
May	1st to 10th	Day	20% 9% 3 7% 4 4 5% 4 5% 6% 32%	5862
	11th to 20th	Day	16% 7% 2 7% 4 5% 5% 4 7% 8% 35%	5861
	21st to end	Day	14% 6% 2 6% 5% 4 5% 4 6% 7% 40%	6477
June	1st to 10th	Day	10% 6% 2 6% 5% 4 6% 5% 6% 8% 42%	2800
	11th to 20th	Day	10% 5% 2 6% 5% 4 5% 5% 7% 9% 43%	2800
	21st to end	Day	9% 5% 2 6% 6% 5% 5% 5% 8% 8% 40%	2800
July	1st to 10th	Day	9% 5% 2 6% 4 4 5% 4 7% 11% 42%	6360
	11th to 20th	Day	6% 5% 2 6% 5% 4 5% 5% 7% 11% 44%	6360
	21st to end	Day	8% 5% 2 6% 4 5% 5% 5% 7% 10% 41%	6607
August	1st to 10th	Day	11% 5% 2 5% 4 4 5% 4 6% 8% 46%	4156
	11th to 20th	Day	8% 6% 2 7% 5% 4 6% 4 7% 9% 41%	4044
	21st to end	Day	8% 5% 2 7% 5% 5% 5% 4 6% 10% 44%	4352
September	1st to 10th	Day	12% 5% 2 7% 5% 5% 4 4 7% 8% 43%	2179
	11th to 20th	Day	9% 4 2 4 4 4 5% 5% 7% 8% 47%	2090
	21st to end	Day	13% 8% 2 7% 4 5% 5% 4 5% 8% 40%	2090
October	1st to 10th	Day	12% 6% 2 7% 4 4 4 3 5% 8% 44%	2082
	11th to 20th	Day	17% 8% 3 7% 5% 4 5% 3 6% 5% 36%	1900
	21st to end	Day	17% 10% 3 7% 5% 6% 4 4 5% 7% 30%	1898
November	1st to 10th	Day	12% 8% 3 7% 4 4 4 4 6% 7% 41%	1762
	11th to 20th	Day	15% 14% 4 9% 5% 4 5% 4 4 6% 29%	1800
	21st to end	Day	19% 13% 5% 8% 6% 4 4 4 5% 7% 26%	1800
December	1st to 10th	Day	11% 14% 7% 13% 7% 5% 5% 4 6% 6% 23%	2930
	11th to 20th	Day	19% 16% 6% 12% 8% 6% 4 4 4 4 17%	3087
	21st to end	Day	26% 21% 6% 11% 6% 4 4 3 3 4 13%	3982
January	1st to 10th	Night	13% 15% 7% 16% 6% 5% 4 3 4 6% 21%	6348
	11th to 20th	Night	12% 16% 8% 14% 8% 6% 5% 4 5% 6% 16%	6360
	21st to end	Night	19% 14% 6% 11% 6% 5% 5% 3 4 5% 23%	6651
February	1st to 10th	Night	16% 15% 4 10% 8% 5% 4 4 5% 6% 24%	2585
	11th to 20th	Night	14% 12% 5% 11% 5% 6% 5% 4 5% 6% 27%	2338
	21st to end	Night	20% 11% 4 9% 6% 5% 4 3 5% 5% 29%	1980
March	1st to 10th	Night	15% 11% 3 7% 4 4 3 3 5% 7% 37%	5338
	11th to 20th	Night	11% 7% 2 6% 4 4 4 4 6% 7% 45%	4980
	21st to end	Night	16% 10% 3 8% 5% 4 4 3 5% 6% 36%	5467
April	1st to 10th	Night	16% 9% 4 7% 5% 4 4 3 5% 7% 36%	2040
	11th to 20th	Night	18% 7% 2 8% 4 4 4 3 5% 6% 39%	1864
	21st to end	Night	16% 9% 3 6% 4 4 4 4 6% 6% 39%	1800
May	1st to 10th	Night	20% 10% 3 7% 5% 5% 5% 4 5% 6% 30%	4033
	11th to 20th	Night	19% 8% 3 7% 4 4 4 3 4 6% 40%	4032
	21st to end	Night	15% 5% 2 6% 4 4 4 3 5% 8% 43%	4362
June	1st to 10th	Night	10% 5% 1 5% 4 4 3 4 6% 9% 48%	1600
	11th to 20th	Night	10% 6% 2 6% 4 5% 5% 4 7% 8% 43%	1600
	21st to end	Night	8% 4 2 6% 4 4 5% 4 7% 10% 46%	1600
July	1st to 10th	Night	7% 3 2 6% 4 4 4 4 6% 11% 50%	3618
	11th to 20th	Night	6% 6% 2 6% 4 4 4 4 6% 9% 48%	3617
	21st to end	Night	9% 5% 2 6% 4 4 5% 4 6% 9% 47%	4248
August	1st to 10th	Night	11% 6% 2 6% 4 4 4 3 5% 9% 47%	2861
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 4 7% 9% 49%	2785
	21st to end	Night	8% 5% 2 7% 4 5% 5% 4 5% 7% 48%	3301
September	1st to 10th	Night	10% 5% 2 5% 4 4 5% 3 5% 6% 51%	1981
	11th to 20th	Night	8% 5% 2 5% 4 3 4 3 5% 7% 56%	2090
	21st to end	Night	14% 7% 2 6% 4 4 3 4 5% 6% 45%	2090
October	1st to 10th	Night	12% 6% 3 6% 4 3 3 4 5% 7% 48%	2096
	11th to 20th	Night	17% 8% 2 7% 5% 5% 4 3 5% 6% 37%	2280
	21st to end	Night	18% 9% 3 7% 4 4 4 4 5% 6% 36%	2698
November	1st to 10th	Night	13% 9% 2 6% 4 4 4 4 4 6% 43%	2536
	11th to 20th	Night	16% 10% 3 8% 5% 4 5% 5% 6% 7% 32%	2600
	21st to end	Night	18% 11% 5% 9% 5% 5% 4 4 5% 7% 27%	2600
December	1st to 10th	Night	12% 12% 5% 11% 6% 5% 5% 5% 7% 7% 25%	4250
	11th to 20th	Night	17% 17% 6% 12% 6% 5% 4 3 5% 5% 20%	5100
	21st to end	Night	27% 18% 6% 9% 5% 4 4 3 4 5% 14%	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	65% 9% 9% 13% 3	3618
	11th to 20th	Day	68% 7% 10% 7% 8%	3620
	21st to end	Day	71% 5% 9% 9% 6%	4310
February	1st to 10th	Day	61% 8% 10% 13% 7% 1	1812
	11th to 20th	Day	58% 8% 10% 15% 8% 1	1958
	21st to end	Day	55% 6% 14% 16% 6% 2	1650
March	1st to 10th	Day	56% 7% 11% 17% 8% 1	4514
	11th to 20th	Day	44% 7% 16% 23% 8% 1	4980
	21st to end	Day	58% 7% 11% 15% 8% 1	5465
April	1st to 10th	Day	52% 8% 12% 18% 11%	2376
	11th to 20th	Day	47% 7% 12% 21% 11% 2	2483
	21st to end	Day	46% 7% 13% 19% 13% 2	2600
May	1st to 10th	Day	49% 9% 11% 17% 13% 1	5897
	11th to 20th	Day	43% 9% 15% 20% 12% 2	5865
	21st to end	Day	40% 8% 10% 21% 17% 3	6491
June	1st to 10th	Day	38% 8% 13% 24% 15% 2	2800
	11th to 20th	Day	36% 9% 14% 22% 17% 3	2800
	21st to end	Day	37% 10% 14% 21% 16% 3	2800
July	1st to 10th	Day	34% 7% 14% 27% 15% 2	6291
	11th to 20th	Day	31% 8% 16% 27% 17% 1	6285
	21st to end	Day	34% 9% 14% 23% 19% 1	6419
August	1st to 10th	Day	34% 8% 16% 25% 17% 1	4143
	11th to 20th	Day	35% 10% 13% 27% 15% 1	4083
	21st to end	Day	33% 8% 13% 33% 11% 2	4351
September	1st to 10th	Day	37% 9% 14% 22% 16% 2	2179
	11th to 20th	Day	32% 7% 13% 27% 19% 1	2090
	21st to end	Day	41% 7% 13% 21% 17%	2090
October	1st to 10th	Day	28% 6% 12% 32% 21% 1	3459
	11th to 20th	Day	38% 5% 10% 26% 20%	3140
	21st to end	Day	42% 7% 12% 26% 11% 1	3098
November	1st to 10th	Day	41% 6% 13% 25% 15% 1	1762
	11th to 20th	Day	55% 6% 11% 17% 9% 2	1800
	21st to end	Day	59% 6% 13% 15% 7% 1	1800
December	1st to 10th	Day	59% 8% 15% 13% 4	2930
	11th to 20th	Day	69% 7% 10% 12% 3	3084
	21st to end	Day	75% 5% 7% 9% 4	3982
January	1st to 10th	Night	62% 7% 9% 16% 5%	6348
	11th to 20th	Night	66% 7% 11% 9% 7%	6360
	21st to end	Night	62% 8% 13% 9% 8%	6651
February	1st to 10th	Night	60% 8% 11% 14% 6% 1	2585
	11th to 20th	Night	55% 7% 10% 19% 7% 1	2339
	21st to end	Night	54% 6% 13% 16% 9% 1	1980
March	1st to 10th	Night	46% 5% 13% 24% 10% 1	5338
	11th to 20th	Night	35% 8% 15% 27% 14% 1	4980
	21st to end	Night	47% 7% 12% 19% 14% 1	5467
April	1st to 10th	Night	46% 7% 10% 21% 14% 2	2040
	11th to 20th	Night	45% 7% 11% 18% 17% 2	1864
	21st to end	Night	44% 7% 11% 20% 15% 2	1800
May	1st to 10th	Night	53% 8% 10% 14% 13% 3	4060
	11th to 20th	Night	44% 7% 11% 25% 12% 2	4033
	21st to end	Night	36% 7% 14% 22% 19% 2	4370
June	1st to 10th	Night	32% 7% 13% 26% 20% 2	1600
	11th to 20th	Night	35% 9% 13% 24% 16% 2	1600
	21st to end	Night	30% 9% 16% 24% 19% 2	1600
July	1st to 10th	Night	29% 7% 14% 26% 19% 5%	3580
	11th to 20th	Night	29% 8% 18% 24% 19% 2	3572
	21st to end	Night	32% 8% 15% 21% 22% 3	4123
August	1st to 10th	Night	34% 8% 15% 26% 16% 1	2850
	11th to 20th	Night	29% 10% 14% 30% 16% 2	2812
	21st to end	Night	33% 8% 12% 28% 16% 2	3301
September	1st to 10th	Night	31% 7% 13% 26% 19% 4	1981
	11th to 20th	Night	27% 7% 10% 29% 25% 2	2090
	21st to end	Night	39% 7% 11% 27% 15% 1	2090
October	1st to 10th	Night	24% 5% 10% 32% 28% 1	3499
	11th to 20th	Night	37% 6% 10% 24% 22%	3779
	21st to end	Night	36% 5% 9% 33% 16% 1	4436
November	1st to 10th	Night	41% 6% 12% 24% 15% 1	2536
	11th to 20th	Night	49% 7% 13% 19% 10% 2	2600
	21st to end	Night	56% 7% 12% 19% 6%	2600
December	1st to 10th	Night	54% 9% 17% 15% 5%	4250
	11th to 20th	Night	64% 7% 12% 12% 5%	5102
	21st to end	Night	71% 6% 10% 8% 4	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	21% 18% 37% 18% 6% 1	300
	11th to 20th	Day	22% 16% 44% 14% 4	300
	21st to end	Day	22% 16% 35% 22% 5%	330
February	1st to 10th	Day	21% 19% 37% 19% 3 1	300
	11th to 20th	Day	24% 20% 35% 19% 2	300
	21st to end	Day	24% 20% 38% 16% 2	249
March	1st to 10th	Day	22% 18% 40% 17% 3	308
	11th to 20th	Day	22% 13% 35% 21% 7% 1	500
	21st to end	Day	27% 17% 31% 18% 6% 1	550
April	1st to 10th	Day	21% 16% 37% 18% 8%	500
	11th to 20th	Day	22% 21% 30% 17% 8% 3	492
	21st to end	Day	23% 12% 33% 20% 10% 2	500
May	1st to 10th	Day	21% 16% 31% 20% 9% 3	503
	11th to 20th	Day	22% 9% 29% 20% 14% 5%	527
	21st to end	Day	15% 7% 26% 26% 17% 9%	591
June	1st to 10th	Day	10% 8% 30% 31% 17% 4	730
	11th to 20th	Day	13% 8% 28% 29% 17% 5%	730
	21st to end	Day	11% 6% 29% 32% 16% 6%	730
July	1st to 10th	Day	10% 4 21% 30% 24% 12%	721
	11th to 20th	Day	10% 4 24% 27% 23% 11%	718
	21st to end	Day	7% 4 22% 31% 25% 11%	655
August	1st to 10th	Day	8% 4 19% 28% 24% 17%	502
	11th to 20th	Day	9% 5% 20% 29% 25% 11%	479
	21st to end	Day	9% 3 19% 30% 27% 13%	539
September	1st to 10th	Day	12% 5% 22% 28% 20% 13%	490
	11th to 20th	Day	10% 3 17% 26% 29% 15%	490
	21st to end	Day	18% 10% 21% 24% 19% 8%	490
October	1st to 10th	Day	13% 7% 28% 27% 17% 8%	490
	11th to 20th	Day	20% 14% 30% 24% 10% 2	490
	21st to end	Day	24% 14% 37% 19% 4 1	347
November	1st to 10th	Day	12% 14% 39% 23% 8% 3	300
	11th to 20th	Day	23% 19% 32% 20% 6% 1	300
	21st to end	Day	26% 17% 37% 16% 4	300
December	1st to 10th	Day	20% 27% 30% 14% 8% 1	300
	11th to 20th	Day	23% 21% 38% 15% 4	300
	21st to end	Day	26% 21% 32% 18% 2 1	330
January	1st to 10th	Night	21% 16% 36% 21% 5% 1	1000
	11th to 20th	Night	25% 14% 37% 19% 5%	1000
	21st to end	Night	21% 13% 36% 24% 6%	950
February	1st to 10th	Night	23% 14% 36% 24% 4	800
	11th to 20th	Night	20% 15% 37% 24% 3	783
	21st to end	Night	24% 15% 38% 19% 3	660
March	1st to 10th	Night	20% 11% 35% 26% 7%	800
	11th to 20th	Night	18% 13% 39% 25% 6% 1	800
	21st to end	Night	23% 12% 33% 25% 7%	880
April	1st to 10th	Night	18% 15% 37% 25% 5%	640
	11th to 20th	Night	19% 11% 35% 25% 9% 1	593
	21st to end	Night	20% 8% 35% 28% 9% 1	600
May	1st to 10th	Night	21% 8% 31% 31% 8% 2	600
	11th to 20th	Night	24% 4 31% 25% 16% 1	591
	21st to end	Night	12% 4 24% 39% 18% 2	650
June	1st to 10th	Night	12% 3 27% 42% 16%	600
	11th to 20th	Night	12% 4 23% 42% 18% 1	600
	21st to end	Night	8% 3 25% 40% 22% 2	600
July	1st to 10th	Night	8% 2 18% 39% 28% 5%	585
	11th to 20th	Night	9% 4 17% 40% 27% 3	582
	21st to end	Night	7% 2 18% 42% 31% 1	657
August	1st to 10th	Night	7% 2 14% 44% 29% 3	579
	11th to 20th	Night	10% 1 16% 40% 27% 5%	564
	21st to end	Night	9% 3 17% 33% 34% 4	627
September	1st to 10th	Night	13% 3 19% 33% 28% 4	651
	11th to 20th	Night	9% 3 17% 33% 34% 4	760
	21st to end	Night	17% 6% 21% 31% 21% 4	760
October	1st to 10th	Night	14% 6% 27% 31% 19% 3	760
	11th to 20th	Night	20% 13% 30% 26% 10% 1	760
	21st to end	Night	22% 14% 33% 26% 6%	836
November	1st to 10th	Night	17% 14% 32% 25% 12% 1	780
	11th to 20th	Night	21% 15% 35% 23% 7% 1	800
	21st to end	Night	21% 12% 38% 23% 6% 1	800
December	1st to 10th	Night	23% 15% 35% 21% 6%	800
	11th to 20th	Night	23% 13% 37% 22% 5%	940
	21st to end	Night	29% 13% 35% 21% 2	1100

Page generated at 2025-08-02 01:32:25. Version ac07

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