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 2024-03-23.

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% 9% 4 7% 6% 4 5% 5% 6% 7% 33%	78776
	Night	15% 10% 4 7% 6% 3 5% 5% 5% 7% 34%	81147
Transparency	Day	48% 8% 12% 19% 11% 1	78485
	Night	49% 8% 12% 19% 11% 1	80959
Seeing	Day	17% 11% 29% 24% 14% 6%	14711
	Night	18% 9% 30% 28% 13% 1	24728

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% 15% 7% 9% 7% 4 5% 5% 5% 6% 20%	2527
	11th to 20th	Day	15% 16% 6% 11% 9% 4 7% 8% 6% 5% 13%	2530
	21st to end	Day	24% 19% 7% 12% 7% 4 4 3 3 3 14%	3007
February	1st to 10th	Day	14% 14% 5% 8% 10% 5% 6% 5% 6% 6% 21%	1721
	11th to 20th	Day	15% 10% 4 8% 8% 5% 6% 5% 5% 6% 26%	1848
	21st to end	Day	17% 12% 6% 9% 6% 3 4 4 6% 6% 27%	1570
March	1st to 10th	Day	15% 10% 4 8% 7% 4 6% 5% 5% 6% 28%	1907
	11th to 20th	Day	14% 11% 4 7% 7% 3 4 4 4 8% 33%	2090
	21st to end	Day	21% 13% 5% 6% 6% 3 5% 4 5% 6% 26%	2200
April	1st to 10th	Day	16% 10% 5% 7% 6% 4 5% 6% 5% 7% 30%	2138
	11th to 20th	Day	18% 8% 4 5% 6% 3 6% 5% 5% 7% 34%	2231
	21st to end	Day	18% 9% 3 7% 5% 3 4 4 6% 7% 34%	2340
May	1st to 10th	Day	16% 8% 3 6% 7% 3 5% 6% 5% 7% 33%	2340
	11th to 20th	Day	19% 8% 3 6% 5% 3 4 4 6% 6% 34%	2301
	21st to end	Day	10% 6% 2 6% 6% 3 6% 6% 6% 8% 39%	2547
June	1st to 10th	Day	10% 5% 3 6% 6% 3 5% 6% 7% 8% 42%	2520
	11th to 20th	Day	11% 4 2 5% 5% 3 5% 6% 6% 9% 43%	2520
	21st to end	Day	10% 5% 2 5% 7% 4 6% 6% 7% 9% 40%	2520
July	1st to 10th	Day	7% 4 2 5% 5% 3 6% 5% 6% 10% 47%	2520
	11th to 20th	Day	8% 5% 2 4 5% 3 5% 6% 6% 11% 45%	2520
	21st to end	Day	8% 4 2 4 5% 4 6% 6% 7% 10% 43%	2618
August	1st to 10th	Day	8% 4 2 4 6% 4 6% 5% 7% 9% 44%	2327
	11th to 20th	Day	9% 5% 2 6% 6% 4 5% 6% 7% 9% 41%	2303
	21st to end	Day	10% 4 2 5% 5% 3 5% 5% 6% 10% 44%	2478
September	1st to 10th	Day	12% 5% 3 6% 6% 4 4 5% 7% 8% 41%	2065
	11th to 20th	Day	10% 4 2 3 5% 3 6% 6% 7% 9% 45%	1980
	21st to end	Day	13% 7% 2 5% 5% 4 5% 5% 5% 8% 42%	1980
October	1st to 10th	Day	12% 6% 3 6% 5% 3 4 5% 5% 8% 43%	1973
	11th to 20th	Day	17% 8% 3 6% 6% 3 4 5% 7% 6% 35%	1800
	21st to end	Day	18% 10% 4 6% 6% 4 5% 5% 5% 7% 30%	1799
November	1st to 10th	Day	12% 7% 4 6% 5% 4 4 5% 6% 7% 41%	1672
	11th to 20th	Day	15% 13% 5% 7% 6% 3 5% 5% 5% 6% 30%	1710
	21st to end	Day	19% 13% 6% 7% 6% 3 4 4 5% 7% 27%	1710
December	1st to 10th	Day	15% 14% 7% 11% 8% 4 4 5% 5% 6% 22%	1710
	11th to 20th	Day	15% 12% 7% 11% 7% 4 5% 6% 5% 6% 22%	1971
	21st to end	Day	23% 21% 8% 10% 7% 3 5% 4 4 5% 11%	2783
January	1st to 10th	Night	16% 16% 7% 9% 6% 3 4 5% 4 6% 24%	4428
	11th to 20th	Night	15% 17% 8% 11% 8% 3 5% 6% 5% 6% 15%	4440
	21st to end	Night	24% 16% 7% 10% 7% 4 4 4 4 4 15%	4651
February	1st to 10th	Night	16% 13% 5% 8% 9% 4 5% 5% 5% 6% 24%	2456
	11th to 20th	Night	14% 11% 6% 9% 6% 4 6% 5% 5% 6% 28%	2218
	21st to end	Night	20% 10% 4 8% 6% 3 5% 4 4 5% 29%	1884
March	1st to 10th	Night	16% 9% 4 7% 7% 3 4 4 5% 6% 35%	2272
	11th to 20th	Night	14% 8% 3 5% 5% 3 4 5% 6% 7% 41%	2090
	21st to end	Night	21% 9% 3 7% 6% 3 4 3 4 7% 34%	2201
April	1st to 10th	Night	14% 7% 4 6% 5% 3 5% 4 6% 8% 37%	1836
	11th to 20th	Night	19% 6% 2 6% 5% 3 5% 4 4 7% 38%	1676
	21st to end	Night	17% 9% 3 5% 5% 3 4 4 6% 7% 38%	1620
May	1st to 10th	Night	17% 8% 3 6% 6% 5% 6% 5% 6% 7% 31%	1620
	11th to 20th	Night	20% 6% 3 6% 5% 3 4 3 4 7% 38%	1592
	21st to end	Night	11% 4 3 5% 5% 3 5% 5% 6% 10% 43%	1724
June	1st to 10th	Night	9% 5% 2 5% 5% 3 4 5% 6% 9% 48%	1440
	11th to 20th	Night	10% 5% 3 6% 5% 3 5% 5% 7% 7% 44%	1440
	21st to end	Night	9% 4 2 5% 4 3 5% 5% 7% 10% 46%	1440
July	1st to 10th	Night	7% 3 2 5% 5% 3 4 5% 5% 9% 54%	1440
	11th to 20th	Night	8% 5% 2 4 4 2 4 4 5% 8% 53%	1440
	21st to end	Night	5% 3 2 4 4 4 5% 6% 6% 10% 50%	1696
August	1st to 10th	Night	7% 3 1 5% 5% 3 4 5% 5% 8% 54%	1611
	11th to 20th	Night	8% 4 2 4 4 3 4 5% 7% 9% 49%	1598
	21st to end	Night	9% 3 2 4 4 3 5% 4 5% 8% 51%	1875
September	1st to 10th	Night	11% 5% 2 5% 5% 3 5% 4 5% 7% 50%	1876
	11th to 20th	Night	8% 4 2 4 5% 2 4 4 5% 8% 53%	1980
	21st to end	Night	13% 6% 2 5% 5% 3 3 5% 5% 6% 47%	1980
October	1st to 10th	Night	12% 6% 3 5% 5% 3 3 5% 5% 7% 46%	1985
	11th to 20th	Night	17% 8% 3 6% 6% 3 4 5% 5% 6% 36%	2160
	21st to end	Night	20% 9% 3 7% 5% 3 4 4 5% 6% 35%	2556
November	1st to 10th	Night	13% 8% 3 5% 4 4 5% 4 5% 6% 43%	2406
	11th to 20th	Night	16% 10% 3 6% 6% 3 5% 5% 7% 7% 32%	2470
	21st to end	Night	18% 10% 6% 8% 6% 3 4 4 5% 7% 29%	2470
December	1st to 10th	Night	17% 13% 5% 9% 7% 4 5% 6% 6% 6% 23%	2470
	11th to 20th	Night	17% 12% 5% 10% 7% 4 5% 5% 5% 6% 25%	3222
	21st to end	Night	27% 17% 7% 9% 6% 3 4 4 4 5% 13%	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	63% 11% 10% 12% 4	2528
	11th to 20th	Day	68% 8% 11% 9% 4	2530
	21st to end	Day	77% 4 8% 7% 3 1	3007
February	1st to 10th	Day	61% 8% 10% 13% 7% 1	1721
	11th to 20th	Day	57% 8% 10% 16% 8% 1	1858
	21st to end	Day	56% 6% 13% 16% 6% 2	1570
March	1st to 10th	Day	54% 7% 12% 19% 7%	1907
	11th to 20th	Day	50% 6% 12% 20% 11% 2	2090
	21st to end	Day	58% 7% 10% 18% 6% 1	2200
April	1st to 10th	Day	52% 8% 12% 18% 11%	2138
	11th to 20th	Day	48% 7% 12% 20% 12% 2	2231
	21st to end	Day	48% 7% 13% 17% 13% 2	2340
May	1st to 10th	Day	49% 9% 12% 19% 10% 1	2340
	11th to 20th	Day	48% 8% 11% 18% 13% 2	2305
	21st to end	Day	40% 10% 13% 23% 12% 2	2547
June	1st to 10th	Day	38% 8% 13% 25% 14% 2	2520
	11th to 20th	Day	35% 10% 14% 21% 17% 3	2520
	21st to end	Day	38% 10% 14% 20% 15% 3	2520
July	1st to 10th	Day	32% 8% 15% 24% 17% 4	2451
	11th to 20th	Day	32% 9% 15% 25% 17% 2	2445
	21st to end	Day	33% 10% 15% 23% 17% 2	2472
August	1st to 10th	Day	33% 10% 18% 25% 14% 1	2314
	11th to 20th	Day	36% 12% 15% 22% 14% 1	2303
	21st to end	Day	34% 8% 13% 25% 16% 4	2478
September	1st to 10th	Day	39% 9% 15% 21% 14% 2	2065
	11th to 20th	Day	33% 7% 14% 28% 17% 1	1980
	21st to end	Day	39% 8% 14% 23% 17% 1	1980
October	1st to 10th	Day	39% 7% 12% 24% 15% 2	1973
	11th to 20th	Day	48% 6% 12% 21% 12%	1800
	21st to end	Day	52% 8% 12% 19% 8% 1	1799
November	1st to 10th	Day	41% 6% 13% 25% 15% 1	1672
	11th to 20th	Day	54% 6% 11% 18% 9% 2	1710
	21st to end	Day	58% 6% 13% 15% 7% 1	1710
December	1st to 10th	Day	64% 7% 11% 13% 5%	1710
	11th to 20th	Day	61% 8% 12% 14% 4	1968
	21st to end	Day	76% 6% 8% 6% 4	2783
January	1st to 10th	Night	61% 8% 11% 14% 6%	4428
	11th to 20th	Night	67% 7% 12% 10% 4	4440
	21st to end	Night	70% 8% 9% 8% 3	4651
February	1st to 10th	Night	60% 8% 12% 14% 5% 1	2456
	11th to 20th	Night	54% 7% 10% 20% 8% 1	2219
	21st to end	Night	55% 7% 12% 16% 9% 1	1884
March	1st to 10th	Night	50% 7% 11% 21% 10% 1	2272
	11th to 20th	Night	41% 8% 14% 19% 16% 2	2090
	21st to end	Night	51% 5% 10% 22% 11% 1	2201
April	1st to 10th	Night	45% 7% 11% 22% 14% 2	1836
	11th to 20th	Night	45% 7% 11% 18% 17% 2	1676
	21st to end	Night	45% 7% 12% 19% 15% 3	1620
May	1st to 10th	Night	51% 9% 11% 17% 10% 2	1620
	11th to 20th	Night	46% 7% 9% 19% 17% 2	1593
	21st to end	Night	35% 8% 15% 25% 14% 2	1725
June	1st to 10th	Night	32% 7% 13% 26% 19% 3	1440
	11th to 20th	Night	35% 10% 13% 23% 16% 3	1440
	21st to end	Night	31% 9% 16% 25% 18% 2	1440
July	1st to 10th	Night	29% 7% 13% 24% 23% 4	1400
	11th to 20th	Night	28% 8% 15% 26% 20% 3	1392
	21st to end	Night	25% 9% 18% 24% 20% 4	1602
August	1st to 10th	Night	26% 9% 16% 30% 17% 2	1600
	11th to 20th	Night	28% 11% 17% 25% 16% 3	1598
	21st to end	Night	29% 8% 13% 25% 22% 3	1875
September	1st to 10th	Night	33% 7% 13% 25% 17% 4	1876
	11th to 20th	Night	28% 8% 11% 29% 23% 1	1980
	21st to end	Night	37% 8% 11% 28% 15% 1	1980
October	1st to 10th	Night	36% 8% 12% 25% 19% 1	1985
	11th to 20th	Night	47% 8% 11% 19% 15% 1	2160
	21st to end	Night	49% 6% 10% 23% 11% 1	2556
November	1st to 10th	Night	41% 6% 12% 24% 15% 1	2406
	11th to 20th	Night	49% 7% 14% 19% 10% 1	2470
	21st to end	Night	55% 7% 13% 19% 7%	2470
December	1st to 10th	Night	60% 8% 12% 13% 7%	2470
	11th to 20th	Night	58% 9% 13% 13% 7% 1	3224
	21st to end	Night	72% 7% 11% 7% 3	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	23% 19% 34% 17% 6% 1	270
	11th to 20th	Day	23% 16% 42% 14% 4	270
	21st to end	Day	24% 16% 33% 23% 5%	297
February	1st to 10th	Day	21% 19% 36% 19% 3 1	270
	11th to 20th	Day	24% 20% 34% 20% 2	270
	21st to end	Day	24% 20% 37% 16% 2	225
March	1st to 10th	Day	22% 18% 40% 17% 3	277
	11th to 20th	Day	22% 13% 35% 22% 7% 1	460
	21st to end	Day	28% 16% 29% 18% 7% 1	470
April	1st to 10th	Day	20% 13% 37% 20% 10%	420
	11th to 20th	Day	22% 19% 30% 17% 8% 4	412
	21st to end	Day	24% 12% 33% 18% 10% 2	420
May	1st to 10th	Day	21% 15% 32% 20% 9% 4	423
	11th to 20th	Day	24% 8% 29% 19% 13% 6%	447
	21st to end	Day	14% 6% 24% 26% 19% 10%	501
June	1st to 10th	Day	9% 7% 31% 31% 18% 4	630
	11th to 20th	Day	13% 7% 27% 28% 18% 6%	630
	21st to end	Day	11% 6% 29% 32% 16% 6%	630
July	1st to 10th	Day	10% 3 20% 29% 25% 13%	621
	11th to 20th	Day	11% 4 22% 28% 23% 11%	618
	21st to end	Day	7% 3 24% 30% 24% 11%	559
August	1st to 10th	Day	9% 3 17% 29% 25% 18%	446
	11th to 20th	Day	9% 5% 19% 29% 26% 12%	439
	21st to end	Day	10% 3 20% 29% 25% 13%	495
September	1st to 10th	Day	13% 5% 21% 28% 20% 13%	450
	11th to 20th	Day	11% 3 18% 26% 29% 13%	450
	21st to end	Day	16% 10% 21% 25% 20% 9%	450
October	1st to 10th	Day	14% 6% 28% 26% 17% 9%	450
	11th to 20th	Day	21% 15% 31% 24% 8% 1	450
	21st to end	Day	26% 14% 37% 19% 3 1	314
November	1st to 10th	Day	12% 14% 39% 23% 9% 4	270
	11th to 20th	Day	23% 19% 31% 21% 6% 1	270
	21st to end	Day	27% 15% 37% 17% 4	270
December	1st to 10th	Day	21% 28% 29% 13% 9% 1	270
	11th to 20th	Day	22% 20% 39% 15% 4	270
	21st to end	Day	24% 23% 33% 18% 2	297
January	1st to 10th	Night	22% 15% 36% 21% 5% 1	950
	11th to 20th	Night	25% 13% 37% 20% 5%	950
	21st to end	Night	21% 12% 36% 24% 6%	903
February	1st to 10th	Night	23% 13% 36% 24% 4	760
	11th to 20th	Night	20% 15% 37% 25% 3	743
	21st to end	Night	24% 16% 37% 20% 3	628
March	1st to 10th	Night	21% 11% 34% 27% 7%	760
	11th to 20th	Night	17% 13% 39% 25% 6% 1	760
	21st to end	Night	23% 11% 33% 25% 7%	801
April	1st to 10th	Night	16% 14% 37% 26% 5% 1	576
	11th to 20th	Night	19% 10% 35% 26% 9% 1	533
	21st to end	Night	21% 7% 34% 27% 9% 1	540
May	1st to 10th	Night	21% 8% 30% 30% 8% 2	540
	11th to 20th	Night	24% 3 31% 26% 16% 1	531
	21st to end	Night	12% 3 24% 38% 20% 3	584
June	1st to 10th	Night	12% 3 25% 43% 17%	540
	11th to 20th	Night	11% 4 24% 41% 19% 1	540
	21st to end	Night	9% 3 25% 40% 22% 2	540
July	1st to 10th	Night	8% 2 17% 39% 29% 6%	525
	11th to 20th	Night	10% 3 16% 41% 27% 3	522
	21st to end	Night	6% 2 18% 42% 31% 1	591
August	1st to 10th	Night	7% 2 14% 44% 30% 3	537
	11th to 20th	Night	10% 1 15% 40% 29% 5%	534
	21st to end	Night	10% 3 18% 32% 33% 4	594
September	1st to 10th	Night	14% 3 18% 34% 27% 5%	616
	11th to 20th	Night	10% 4 17% 33% 32% 4	720
	21st to end	Night	15% 5% 21% 31% 22% 5%	720
October	1st to 10th	Night	15% 6% 26% 31% 19% 3	720
	11th to 20th	Night	20% 13% 31% 26% 9% 1	720
	21st to end	Night	23% 14% 33% 24% 6%	792
November	1st to 10th	Night	17% 14% 31% 25% 12% 1	740
	11th to 20th	Night	20% 14% 35% 23% 7% 1	760
	21st to end	Night	21% 12% 37% 23% 6% 1	760
December	1st to 10th	Night	23% 15% 36% 21% 5%	760
	11th to 20th	Night	23% 13% 37% 22% 5%	893
	21st to end	Night	29% 13% 35% 20% 2	1045

Page generated at 2024-03-19 23:31:05. Version ac07

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