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 2024-11-03.

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	13% 6% 2 5% 4 4 4 4 6% 8% 44%	101104
	Night	15% 6% 2 6% 4 4 4 4 5% 7% 43%	97831
Transparency	Day	37% 7% 14% 24% 15% 3	100899
	Night	40% 7% 12% 23% 16% 3	97706
Seeing	Day	14% 3 15% 29% 27% 11%	15140
	Night	16% 6% 24% 32% 19% 3	24612

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	15% 5% 2 4 3 3 3 3 4 7% 50%	2558
	11th to 20th	Day	13% 8% 3 7% 4 4 3 3 5% 6% 43%	2840
	21st to end	Day	14% 9% 4 8% 5% 4 4 3 5% 5% 39%	3124
February	1st to 10th	Day	13% 8% 3 6% 5% 4 5% 4 6% 8% 39%	1710
	11th to 20th	Day	19% 6% 2 5% 3 3 4 3 5% 7% 45%	1786
	21st to end	Day	17% 6% 3 6% 4 5% 5% 4 5% 7% 38%	1570
March	1st to 10th	Day	22% 7% 2 5% 4 3 4 4 6% 7% 37%	3297
	11th to 20th	Day	10% 4 1 4 3 3 3 4 5% 8% 54%	3480
	21st to end	Day	20% 7% 2 5% 3 3 3 3 5% 7% 41%	3938
April	1st to 10th	Day	12% 6% 2 5% 3 3 4 4 6% 7% 49%	2280
	11th to 20th	Day	10% 5% 2 5% 5% 4 4 3 5% 6% 51%	2254
	21st to end	Day	13% 7% 2 5% 3 4 4 4 5% 8% 46%	2280
May	1st to 10th	Day	18% 8% 3 7% 5% 5% 4 4 6% 9% 32%	3828
	11th to 20th	Day	19% 7% 2 6% 4 4 4 4 6% 7% 37%	4329
	21st to end	Day	9% 4 1 5% 3 4 4 4 6% 10% 48%	4823
June	1st to 10th	Day	10% 4 1 4 4 4 4 4 6% 10% 46%	2660
	11th to 20th	Day	9% 4 2 4 5% 3 5% 4 7% 11% 46%	2660
	21st to end	Day	7% 3 1 5% 4 5% 5% 5% 7% 11% 47%	2660
July	1st to 10th	Day	6% 4 2 5% 4 4 6% 5% 8% 12% 44%	4440
	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%	1750
	11th to 20th	Day	14% 5% 2 5% 4 3 4 3 5% 7% 47%	1710
	21st to end	Day	15% 4 2 5% 4 3 3 3 5% 5% 51%	1602
December	1st to 10th	Day	15% 7% 2 6% 4 3 4 4 6% 7% 43%	1520
	11th to 20th	Day	16% 7% 2 5% 4 3 3 2 4 5% 50%	1910
	21st to end	Day	15% 7% 3 7% 4 4 3 3 5% 7% 42%	2772
January	1st to 10th	Night	14% 8% 2 6% 4 4 3 3 5% 7% 44%	4385
	11th to 20th	Night	16% 7% 2 7% 4 4 3 3 4 6% 45%	4120
	21st to end	Night	18% 10% 3 7% 4 3 3 2 5% 4 41%	4532
February	1st to 10th	Night	15% 9% 2 5% 3 4 3 3 5% 6% 43%	2470
	11th to 20th	Night	19% 7% 2 5% 4 3 3 3 6% 7% 41%	2279
	21st to end	Night	17% 8% 2 5% 3 3 3 3 5% 6% 45%	1884
March	1st to 10th	Night	23% 8% 3 6% 4 3 3 4 4 6% 37%	3552
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 5% 7% 50%	3480
	21st to end	Night	17% 9% 3 5% 3 2 3 2 4 5% 46%	3692
April	1st to 10th	Night	15% 7% 2 6% 4 4 5% 4 5% 7% 41%	1900
	11th to 20th	Night	11% 5% 2 5% 4 3 5% 3 5% 8% 48%	1875
	21st to end	Night	17% 5% 2 6% 4 4 4 3 5% 7% 44%	1900
May	1st to 10th	Night	20% 7% 3 7% 5% 5% 4 4 5% 7% 33%	3082
	11th to 20th	Night	23% 8% 2 6% 4 4 4 4 5% 6% 33%	2562
	21st to end	Night	10% 5% 2 6% 5% 5% 4 3 7% 10% 44%	2732
June	1st to 10th	Night	12% 5% 1 5% 4 5% 4 4 7% 9% 43%	1520
	11th to 20th	Night	10% 5% 2 6% 5% 5% 5% 5% 6% 10% 42%	1520
	21st to end	Night	7% 4 2 6% 5% 4 7% 5% 7% 10% 43%	1520
July	1st to 10th	Night	8% 4 2 7% 5% 5% 6% 5% 8% 10% 39%	2520
	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	14% 6% 2 5% 3 3 3 3 5% 6% 50%	2372
	11th to 20th	Night	16% 7% 2 6% 4 4 3 3 5% 5% 47%	2470
	21st to end	Night	13% 5% 2 5% 4 4 4 3 5% 7% 50%	2574
December	1st to 10th	Night	17% 8% 2 6% 5% 3 4 3 5% 6% 41%	2660
	11th to 20th	Night	17% 6% 2 7% 4 3 3 3 5% 6% 43%	3285
	21st to end	Night	13% 7% 3 6% 4 4 4 4 6% 8% 41%	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	35% 5% 9% 34% 15% 3	2559
	11th to 20th	Day	42% 5% 10% 21% 19% 5%	2840
	21st to end	Day	46% 6% 11% 23% 13% 2	3124
February	1st to 10th	Day	42% 5% 12% 26% 13% 2	1710
	11th to 20th	Day	39% 6% 9% 22% 19% 5%	1795
	21st to end	Day	45% 5% 14% 17% 16% 4	1570
March	1st to 10th	Day	44% 7% 12% 20% 14% 4	3297
	11th to 20th	Day	27% 5% 11% 28% 24% 6%	3480
	21st to end	Day	43% 6% 10% 19% 18% 4	3938
April	1st to 10th	Day	33% 5% 15% 22% 19% 6%	2280
	11th to 20th	Day	33% 6% 11% 24% 20% 5%	2254
	21st to end	Day	37% 6% 12% 24% 16% 5%	2280
May	1st to 10th	Day	48% 9% 12% 21% 9% 2	3863
	11th to 20th	Day	44% 9% 13% 24% 8% 1	4333
	21st to end	Day	28% 10% 16% 27% 17% 2	4837
June	1st to 10th	Day	32% 8% 17% 28% 13% 2	2660
	11th to 20th	Day	29% 11% 17% 25% 16% 2	2660
	21st to end	Day	29% 10% 16% 25% 18% 2	2660
July	1st to 10th	Day	28% 13% 25% 19% 12% 3	4370
	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	38% 6% 11% 24% 19% 3	1900
	11th to 20th	Day	34% 5% 9% 26% 22% 4	1900
	21st to end	Day	34% 5% 8% 26% 22% 5%	2090
November	1st to 10th	Day	34% 5% 10% 26% 20% 4	1750
	11th to 20th	Day	37% 6% 11% 19% 22% 5%	1710
	21st to end	Day	36% 4 10% 28% 19% 4	1602
December	1st to 10th	Day	40% 6% 13% 24% 13% 3	1520
	11th to 20th	Day	39% 4 9% 28% 16% 5%	1906
	21st to end	Day	41% 6% 14% 26% 13% 1	2772
January	1st to 10th	Night	39% 4 10% 25% 18% 4	4385
	11th to 20th	Night	42% 4 9% 25% 18% 3	4120
	21st to end	Night	46% 5% 7% 24% 16% 2	4532
February	1st to 10th	Night	41% 5% 11% 24% 16% 2	2470
	11th to 20th	Night	42% 5% 8% 21% 19% 5%	2281
	21st to end	Night	41% 4 10% 22% 18% 5%	1884
March	1st to 10th	Night	48% 5% 9% 22% 14% 2	3552
	11th to 20th	Night	33% 5% 10% 25% 22% 5%	3480
	21st to end	Night	41% 4 8% 24% 18% 6%	3692
April	1st to 10th	Night	41% 6% 10% 17% 20% 5%	1900
	11th to 20th	Night	34% 7% 11% 21% 21% 5%	1875
	21st to end	Night	39% 6% 13% 23% 15% 4	1900
May	1st to 10th	Night	49% 8% 12% 22% 9% 2	3112
	11th to 20th	Night	49% 9% 12% 21% 9% 1	2563
	21st to end	Night	33% 9% 15% 26% 16% 1	2739
June	1st to 10th	Night	38% 8% 12% 24% 16% 2	1520
	11th to 20th	Night	36% 11% 12% 25% 14% 2	1520
	21st to end	Night	33% 10% 16% 21% 17% 3	1520
July	1st to 10th	Night	37% 13% 18% 18% 11% 2	2480
	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	39% 6% 10% 23% 18% 3	2280
	11th to 20th	Night	36% 5% 8% 24% 23% 4	2280
	21st to end	Night	35% 4 10% 27% 20% 4	2508
November	1st to 10th	Night	36% 5% 11% 25% 18% 4	2372
	11th to 20th	Night	40% 5% 9% 21% 20% 6%	2470
	21st to end	Night	33% 6% 10% 27% 21% 4	2574
December	1st to 10th	Night	44% 5% 11% 23% 13% 3	2660
	11th to 20th	Night	42% 4 11% 22% 18% 4	3288
	21st to end	Night	39% 6% 15% 27% 12% 2	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	18% 4 25% 40% 12% 1	193
	11th to 20th	Day	15% 7% 28% 37% 12%	270
	21st to end	Day	17% 4 22% 41% 15% 1	297
February	1st to 10th	Day	17% 5% 16% 46% 15% 1	270
	11th to 20th	Day	24% 5% 28% 33% 9% 1	394
	21st to end	Day	21% 5% 26% 36% 10% 1	382
March	1st to 10th	Day	17% 5% 27% 35% 13% 2	460
	11th to 20th	Day	16% 5% 25% 40% 12% 2	460
	21st to end	Day	19% 5% 25% 34% 16% 3	506
April	1st to 10th	Day	14% 4 26% 36% 17% 3	460
	11th to 20th	Day	8% 4 19% 36% 27% 6%	452
	21st to end	Day	15% 5% 19% 33% 25% 3	460
May	1st to 10th	Day	17% 4 17% 32% 24% 5%	463
	11th to 20th	Day	17% 3 12% 33% 27% 8%	487
	21st to end	Day	16% 3 7% 25% 33% 17%	529
June	1st to 10th	Day	10% 2 8% 28% 31% 20%	490
	11th to 20th	Day	9% 2 7% 27% 39% 16%	490
	21st to end	Day	8% 2 9% 25% 39% 16%	490
July	1st to 10th	Day	10% 2 4 23% 37% 24%	485
	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 22% 31% 21% 8%	403
	11th to 20th	Day	14% 6% 30% 29% 18% 3	370
	21st to end	Day	14% 6% 24% 30% 21% 5%	262
December	1st to 10th	Day	18% 3 26% 35% 17% 2	180
	11th to 20th	Day	20% 5% 23% 33% 17% 1	180
	21st to end	Day	18% 3 23% 36% 18% 3	198
January	1st to 10th	Night	18% 12% 37% 28% 6%	760
	11th to 20th	Night	20% 9% 32% 30% 9%	760
	21st to end	Night	19% 10% 35% 31% 4	836
February	1st to 10th	Night	18% 6% 34% 35% 6%	760
	11th to 20th	Night	20% 11% 39% 27% 3	743
	21st to end	Night	20% 8% 33% 33% 4 1	628
March	1st to 10th	Night	17% 6% 34% 34% 9% 1	760
	11th to 20th	Night	18% 6% 32% 33% 8% 2	760
	21st to end	Night	18% 5% 30% 37% 9% 1	836
April	1st to 10th	Night	16% 6% 35% 31% 10% 1	760
	11th to 20th	Night	13% 5% 25% 39% 17% 1	751
	21st to end	Night	19% 4 23% 39% 14% 1	760
May	1st to 10th	Night	17% 5% 22% 38% 16% 1	738
	11th to 20th	Night	15% 5% 21% 39% 19% 1	415
	21st to end	Night	14% 3 9% 30% 37% 6%	411
June	1st to 10th	Night	11% 2 16% 33% 34% 4	380
	11th to 20th	Night	12% 2 12% 37% 32% 5%	380
	21st to end	Night	6% 2 12% 41% 34% 5%	380
July	1st to 10th	Night	10% 1 10% 31% 40% 8%	370
	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	749
	11th to 20th	Night	18% 8% 29% 31% 13% 1	760
	21st to end	Night	13% 10% 28% 33% 14% 2	760
December	1st to 10th	Night	20% 7% 34% 27% 10% 2	760
	11th to 20th	Night	18% 7% 37% 28% 9%	760
	21st to end	Night	18% 8% 31% 33% 10%	836

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