Point Lookout State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Point Lookout State Park clear sky chart from 2005-11-06 to 2025-07-06.

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% 6% 2 5% 4 4 4 4 6% 8% 45%	119793
	Night	14% 6% 2 6% 4 4 4 3 5% 7% 45%	119002
Transparency	Day	36% 7% 13% 24% 17% 4	123424
	Night	38% 6% 11% 24% 18% 4	123508
Seeing	Day	15% 3 16% 30% 26% 10%	15973
	Night	16% 6% 24% 33% 19% 3	25480

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	14% 4 2 4 3 3 3 3 4 7% 54%	3666
	11th to 20th	Day	12% 7% 2 7% 4 4 3 3 4 5% 49%	4060
	21st to end	Day	12% 7% 3 7% 5% 4 4 3 5% 6% 43%	4466
February	1st to 10th	Day	14% 8% 3 6% 4 4 5% 4 7% 8% 38%	1800
	11th to 20th	Day	19% 7% 2 5% 3 3 4 3 5% 7% 43%	1883
	21st to end	Day	17% 6% 3 6% 4 5% 4 4 5% 6% 40%	1650
March	1st to 10th	Day	18% 5% 2 5% 4 3 4 4 7% 8% 41%	4727
	11th to 20th	Day	10% 7% 2 4 3 3 3 3 5% 7% 53%	4980
	21st to end	Day	16% 7% 2 5% 4 4 3 3 5% 7% 43%	5644
April	1st to 10th	Day	12% 6% 2 5% 3 3 4 4 6% 7% 48%	2400
	11th to 20th	Day	10% 5% 2 5% 5% 4 4 3 5% 6% 51%	2374
	21st to end	Day	13% 7% 2 5% 3 4 4 4 5% 8% 46%	2400
May	1st to 10th	Day	16% 7% 2 7% 4 4 5% 4 6% 10% 35%	5496
	11th to 20th	Day	18% 6% 2 6% 4 5% 4 4 6% 8% 36%	6221
	21st to end	Day	14% 5% 2 5% 4 4 4 4 6% 9% 42%	6934
June	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 6% 10% 46%	2800
	11th to 20th	Day	10% 4 2 4 5% 3 5% 4 7% 11% 46%	2800
	21st to end	Day	8% 3 1 5% 4 4 4 5% 7% 11% 48%	2800
July	1st to 10th	Day	6% 4 2 5% 3 4 6% 5% 8% 12% 45%	4510
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 5% 8% 12% 38%	4347
	21st to end	Day	9% 5% 3 7% 6% 6% 6% 6% 8% 9% 37%	4466
August	1st to 10th	Day	13% 7% 3 7% 4 4 5% 5% 8% 11% 34%	4104
	11th to 20th	Day	9% 5% 2 6% 5% 6% 5% 4 6% 8% 42%	3743
	21st to end	Day	9% 3 1 4 3 4 4 3 5% 9% 55%	4180
September	1st to 10th	Day	13% 4 2 5% 3 5% 4 3 6% 6% 49%	2280
	11th to 20th	Day	13% 6% 2 6% 4 4 4 3 4 8% 47%	2280
	21st to end	Day	19% 7% 3 5% 4 5% 4 3 4 6% 40%	2033
October	1st to 10th	Day	16% 5% 2 6% 4 3 3 3 5% 5% 48%	1900
	11th to 20th	Day	16% 5% 1 4 3 3 3 3 4 5% 53%	1900
	21st to end	Day	12% 5% 2 5% 4 4 3 3 5% 6% 51%	2090
November	1st to 10th	Day	14% 5% 1 4 4 4 3 3 4 6% 53%	1823
	11th to 20th	Day	14% 5% 2 5% 4 3 4 4 5% 7% 47%	1800
	21st to end	Day	14% 4 2 6% 4 3 3 3 5% 5% 51%	1686
December	1st to 10th	Day	10% 6% 2 5% 3 3 3 3 6% 6% 53%	2600
	11th to 20th	Day	18% 7% 2 6% 3 3 3 2 4 5% 47%	2990
	21st to end	Day	12% 6% 2 6% 3 4 3 3 5% 7% 48%	3960
January	1st to 10th	Night	12% 7% 2 5% 4 3 3 2 4 6% 50%	6277
	11th to 20th	Night	12% 6% 2 6% 3 3 3 2 3 5% 53%	5900
	21st to end	Night	15% 8% 3 6% 4 3 3 3 4 5% 47%	6490
February	1st to 10th	Night	16% 9% 2 5% 3 4 3 3 5% 6% 43%	2600
	11th to 20th	Night	20% 7% 2 4 4 3 3 3 6% 6% 41%	2402
	21st to end	Night	16% 8% 3 5% 3 3 3 3 5% 6% 45%	1980
March	1st to 10th	Night	17% 6% 2 6% 3 3 3 3 4 6% 47%	5108
	11th to 20th	Night	12% 7% 2 4 3 3 4 3 5% 7% 50%	4980
	21st to end	Night	15% 8% 3 5% 4 3 4 3 4 6% 46%	5286
April	1st to 10th	Night	16% 7% 2 6% 4 4 5% 4 5% 7% 41%	2000
	11th to 20th	Night	12% 5% 2 5% 4 3 5% 3 5% 8% 47%	1975
	21st to end	Night	16% 5% 2 6% 4 4 4 3 5% 7% 45%	2000
May	1st to 10th	Night	16% 7% 3 8% 5% 5% 5% 4 6% 8% 33%	4428
	11th to 20th	Night	22% 7% 2 7% 4 4 4 4 6% 7% 33%	3670
	21st to end	Night	16% 6% 2 6% 5% 4 4 3 6% 8% 39%	3920
June	1st to 10th	Night	12% 5% 2 5% 4 6% 5% 4 6% 8% 43%	1600
	11th to 20th	Night	12% 5% 2 6% 5% 5% 5% 5% 6% 9% 41%	1600
	21st to end	Night	7% 4 2 5% 5% 5% 7% 5% 7% 10% 44%	1600
July	1st to 10th	Night	8% 4 2 7% 5% 5% 6% 5% 8% 10% 39%	2560
	11th to 20th	Night	10% 5% 2 5% 5% 5% 5% 5% 8% 11% 39%	2608
	21st to end	Night	12% 7% 3 8% 6% 5% 5% 5% 6% 9% 34%	3087
August	1st to 10th	Night	16% 7% 3 7% 4 4 5% 5% 7% 10% 33%	2825
	11th to 20th	Night	10% 6% 3 7% 5% 5% 5% 5% 7% 9% 40%	3054
	21st to end	Night	10% 4 2 4 4 4 4 3 5% 7% 52%	3476
September	1st to 10th	Night	14% 5% 2 5% 4 4 4 3 6% 6% 48%	1900
	11th to 20th	Night	11% 4 2 6% 3 4 5% 4 6% 9% 46%	1900
	21st to end	Night	21% 7% 2 7% 4 4 4 5% 5% 6% 37%	2143
October	1st to 10th	Night	16% 7% 2 5% 4 3 4 3 5% 6% 45%	2280
	11th to 20th	Night	17% 5% 2 4 3 3 4 2 4 6% 51%	2280
	21st to end	Night	15% 5% 2 5% 3 3 4 3 4 7% 50%	2508
November	1st to 10th	Night	13% 6% 2 5% 3 3 3 3 4 6% 51%	2474
	11th to 20th	Night	16% 7% 2 6% 4 4 3 3 5% 5% 46%	2600
	21st to end	Night	13% 4 2 5% 4 4 4 3 5% 7% 50%	2710
December	1st to 10th	Night	10% 6% 2 4 3 3 3 3 5% 6% 54%	4580
	11th to 20th	Night	20% 6% 2 7% 4 4 4 3 5% 6% 38%	5205
	21st to end	Night	12% 7% 3 6% 4 4 4 4 6% 8% 45%	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	32% 4 6% 28% 24% 7%	3667
	11th to 20th	Day	38% 4 7% 21% 24% 7%	4060
	21st to end	Day	42% 5% 10% 28% 13% 2	4466
February	1st to 10th	Day	42% 5% 12% 26% 13% 2	1800
	11th to 20th	Day	41% 5% 9% 22% 19% 4	1892
	21st to end	Day	43% 5% 13% 19% 16% 4	1650
March	1st to 10th	Day	39% 6% 10% 20% 19% 7%	4727
	11th to 20th	Day	30% 5% 10% 25% 23% 7%	4980
	21st to end	Day	41% 6% 11% 18% 18% 6%	5644
April	1st to 10th	Day	34% 5% 14% 22% 18% 6%	2400
	11th to 20th	Day	33% 6% 12% 24% 20% 5%	2374
	21st to end	Day	36% 6% 12% 25% 16% 5%	2400
May	1st to 10th	Day	44% 9% 15% 20% 10% 1	5528
	11th to 20th	Day	43% 10% 13% 24% 9% 1	6225
	21st to end	Day	36% 9% 14% 25% 14% 2	6949
June	1st to 10th	Day	32% 8% 16% 28% 14% 2	2800
	11th to 20th	Day	30% 11% 17% 24% 16% 2	2800
	21st to end	Day	29% 10% 16% 25% 19% 1	2800
July	1st to 10th	Day	28% 13% 25% 19% 13% 3	4440
	11th to 20th	Day	36% 10% 21% 25% 7% 1	4272
	21st to end	Day	39% 11% 15% 19% 15% 1	4324
August	1st to 10th	Day	42% 9% 18% 24% 7% 1	4091
	11th to 20th	Day	36% 10% 14% 27% 13%	3779
	21st to end	Day	27% 7% 15% 30% 19% 3	4180
September	1st to 10th	Day	34% 8% 16% 20% 18% 4	2280
	11th to 20th	Day	36% 6% 11% 26% 19% 3	2280
	21st to end	Day	45% 6% 9% 20% 16% 3	2033
October	1st to 10th	Day	34% 6% 10% 22% 25% 4	3160
	11th to 20th	Day	26% 4 6% 23% 31% 10%	3140
	21st to end	Day	22% 4 9% 30% 26% 10%	3428
November	1st to 10th	Day	34% 5% 10% 26% 21% 4	1823
	11th to 20th	Day	37% 6% 11% 19% 22% 5%	1800
	21st to end	Day	35% 4 10% 28% 19% 3	1686
December	1st to 10th	Day	31% 6% 12% 29% 19% 4	2600
	11th to 20th	Day	42% 3 12% 23% 16% 3	2986
	21st to end	Day	36% 6% 15% 28% 15% 1	3960
January	1st to 10th	Night	36% 4 7% 22% 26% 5%	6277
	11th to 20th	Night	35% 4 6% 26% 23% 5%	5900
	21st to end	Night	40% 4 8% 28% 18% 2	6490
February	1st to 10th	Night	41% 5% 11% 24% 16% 2	2600
	11th to 20th	Night	43% 5% 9% 21% 19% 5%	2404
	21st to end	Night	40% 4 9% 22% 19% 6%	1980
March	1st to 10th	Night	39% 5% 8% 23% 18% 8%	5108
	11th to 20th	Night	33% 5% 10% 23% 22% 7%	4980
	21st to end	Night	40% 4 8% 24% 17% 7%	5286
April	1st to 10th	Night	42% 7% 10% 17% 20% 5%	2000
	11th to 20th	Night	35% 6% 11% 21% 21% 5%	1975
	21st to end	Night	38% 6% 13% 22% 16% 4	2000
May	1st to 10th	Night	47% 8% 14% 22% 8% 2	4458
	11th to 20th	Night	48% 8% 12% 21% 11%	3671
	21st to end	Night	41% 8% 13% 24% 13% 1	3927
June	1st to 10th	Night	38% 8% 12% 24% 16% 2	1600
	11th to 20th	Night	37% 10% 12% 25% 14% 2	1600
	21st to end	Night	33% 10% 16% 22% 17% 3	1600
July	1st to 10th	Night	37% 13% 18% 19% 11% 2	2520
	11th to 20th	Night	35% 10% 24% 24% 6%	2560
	21st to end	Night	45% 10% 14% 19% 11%	2988
August	1st to 10th	Night	46% 9% 16% 22% 7%	2814
	11th to 20th	Night	39% 10% 15% 24% 11%	3084
	21st to end	Night	31% 7% 11% 26% 25% 1	3476
September	1st to 10th	Night	35% 8% 15% 19% 17% 5%	1900
	11th to 20th	Night	33% 7% 12% 24% 21% 2	1900
	21st to end	Night	46% 8% 10% 17% 16% 3	2143
October	1st to 10th	Night	37% 6% 11% 22% 21% 4	3800
	11th to 20th	Night	26% 4 9% 23% 30% 9%	3779
	21st to end	Night	22% 3 9% 33% 24% 9%	4120
November	1st to 10th	Night	36% 5% 11% 25% 20% 4	2474
	11th to 20th	Night	40% 5% 8% 21% 19% 6%	2600
	21st to end	Night	33% 6% 10% 26% 21% 4	2710
December	1st to 10th	Night	31% 4 12% 28% 22% 3	4580
	11th to 20th	Night	47% 4 11% 21% 12% 5%	5208
	21st to end	Night	37% 5% 14% 28% 15% 1	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	17% 5% 28% 38% 11%	215
	11th to 20th	Day	15% 7% 29% 38% 11%	300
	21st to end	Day	16% 4 22% 42% 14% 1	330
February	1st to 10th	Day	17% 5% 18% 45% 14% 1	300
	11th to 20th	Day	25% 6% 29% 31% 8%	431
	21st to end	Day	21% 6% 26% 37% 11% 1	414
March	1st to 10th	Day	17% 5% 28% 36% 13% 2	500
	11th to 20th	Day	16% 5% 24% 39% 13% 2	500
	21st to end	Day	18% 5% 25% 35% 15% 2	550
April	1st to 10th	Day	16% 5% 25% 36% 16% 2	500
	11th to 20th	Day	9% 4 20% 36% 25% 6%	492
	21st to end	Day	15% 5% 18% 32% 26% 4	500
May	1st to 10th	Day	17% 4 17% 34% 24% 5%	503
	11th to 20th	Day	17% 3 13% 33% 26% 8%	527
	21st to end	Day	17% 3 8% 26% 31% 16%	573
June	1st to 10th	Day	10% 2 8% 29% 31% 19%	530
	11th to 20th	Day	10% 2 7% 26% 40% 15%	530
	21st to end	Day	8% 2 8% 23% 39% 19%	530
July	1st to 10th	Day	10% 2 4 23% 37% 24%	505
	11th to 20th	Day	4 1 4 16% 50% 25%	484
	21st to end	Day	9% 2 5% 24% 42% 18%	532
August	1st to 10th	Day	12% 1 6% 23% 40% 18%	486
	11th to 20th	Day	10% 1 7% 24% 40% 19%	479
	21st to end	Day	9% 2 5% 24% 37% 23%	539
September	1st to 10th	Day	15% 1 8% 20% 32% 23%	490
	11th to 20th	Day	14% 3 7% 21% 35% 21%	490
	21st to end	Day	25% 3 16% 23% 24% 9%	490
October	1st to 10th	Day	18% 3 10% 26% 27% 15%	490
	11th to 20th	Day	17% 2 16% 29% 26% 10%	490
	21st to end	Day	14% 4 20% 31% 25% 7%	539
November	1st to 10th	Day	16% 3 21% 32% 21% 7%	428
	11th to 20th	Day	14% 6% 29% 31% 18% 3	400
	21st to end	Day	13% 6% 25% 31% 20% 5%	286
December	1st to 10th	Day	17% 3 26% 36% 18% 2	200
	11th to 20th	Day	21% 5% 23% 35% 16% 1	200
	21st to end	Day	16% 4 22% 38% 17% 2	220
January	1st to 10th	Night	17% 12% 38% 27% 6%	800
	11th to 20th	Night	19% 10% 32% 31% 8%	800
	21st to end	Night	19% 10% 36% 32% 4	880
February	1st to 10th	Night	19% 6% 34% 35% 6%	800
	11th to 20th	Night	21% 11% 39% 26% 3	783
	21st to end	Night	20% 8% 33% 34% 4 1	660
March	1st to 10th	Night	16% 6% 35% 34% 8% 1	800
	11th to 20th	Night	18% 6% 32% 33% 9% 2	800
	21st to end	Night	18% 5% 30% 37% 8% 1	880
April	1st to 10th	Night	17% 6% 35% 32% 10% 1	800
	11th to 20th	Night	14% 5% 26% 39% 16% 1	791
	21st to end	Night	18% 4 22% 39% 15% 1	800
May	1st to 10th	Night	16% 5% 22% 39% 16% 2	777
	11th to 20th	Night	15% 4 22% 39% 19% 1	437
	21st to end	Night	15% 3 12% 30% 35% 5%	433
June	1st to 10th	Night	12% 2 15% 33% 34% 4	400
	11th to 20th	Night	13% 3 11% 37% 32% 5%	400
	21st to end	Night	6% 2 12% 40% 34% 6%	400
July	1st to 10th	Night	10% 1 10% 31% 40% 8%	380
	11th to 20th	Night	5% 1 6% 33% 47% 10%	417
	21st to end	Night	8% 2 8% 35% 42% 5%	624
August	1st to 10th	Night	10% 2 7% 40% 36% 6%	567
	11th to 20th	Night	11% 3 10% 34% 36% 7%	719
	21st to end	Night	12% 2 8% 30% 38% 10%	836
September	1st to 10th	Night	15% 2 9% 29% 36% 10%	760
	11th to 20th	Night	12% 3 10% 28% 39% 8%	760
	21st to end	Night	23% 3 15% 31% 25% 3	760
October	1st to 10th	Night	19% 4 17% 27% 26% 7%	760
	11th to 20th	Night	18% 6% 24% 29% 21% 2	760
	21st to end	Night	18% 7% 25% 28% 18% 3	836
November	1st to 10th	Night	16% 6% 23% 34% 17% 4	780
	11th to 20th	Night	18% 8% 28% 32% 13% 1	800
	21st to end	Night	13% 10% 29% 33% 14% 2	800
December	1st to 10th	Night	19% 7% 34% 28% 10% 2	800
	11th to 20th	Night	18% 7% 37% 28% 9%	800
	21st to end	Night	18% 7% 30% 34% 10%	880

Page generated at 2025-07-03 01:30:14. Version ac07

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