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 2026-10-29.

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% 5% 2 6% 4 4 4 4 6% 8% 44%	149218
	Night	14% 6% 2 6% 4 4 4 4 5% 7% 44%	142867
Transparency	Day	36% 7% 13% 24% 16% 3	152808
	Night	38% 6% 12% 23% 17% 4	147348
Seeing	Day	14% 3 16% 30% 26% 10%	17746
	Night	16% 6% 24% 33% 19% 3	27190

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% 5% 2 5% 4 3 4 3 5% 7% 50%	4758
	11th to 20th	Day	13% 7% 2 6% 4 3 3 2 4 4 52%	5280
	21st to end	Day	12% 7% 3 7% 5% 4 4 3 5% 5% 44%	5780
February	1st to 10th	Day	13% 8% 3 6% 4 4 5% 4 7% 8% 40%	1890
	11th to 20th	Day	19% 7% 2 5% 3 3 4 3 4 7% 43%	1980
	21st to end	Day	17% 6% 3 6% 4 5% 4 4 5% 6% 39%	1730
March	1st to 10th	Day	17% 6% 2 5% 4 3 4 4 7% 8% 41%	4832
	11th to 20th	Day	10% 8% 2 4 3 3 3 3 5% 7% 52%	5090
	21st to end	Day	16% 7% 2 5% 4 3 3 3 5% 7% 43%	5769
April	1st to 10th	Day	12% 6% 2 5% 3 3 4 3 6% 8% 49%	2520
	11th to 20th	Day	10% 5% 2 5% 5% 4 4 3 5% 6% 51%	2494
	21st to end	Day	13% 6% 2 5% 3 4 4 3 5% 8% 46%	2520
May	1st to 10th	Day	16% 6% 2 6% 4 4 4 4 6% 9% 40%	7138
	11th to 20th	Day	15% 5% 2 5% 3 4 4 4 6% 8% 45%	8098
	21st to end	Day	20% 5% 2 6% 4 4 4 4 5% 8% 40%	9045
June	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 6% 10% 47%	2940
	11th to 20th	Day	10% 4 1 4 5% 3 5% 4 7% 11% 46%	2940
	21st to end	Day	8% 3 1 5% 4 4 5% 5% 7% 11% 47%	2940
July	1st to 10th	Day	8% 4 2 5% 3 4 5% 5% 7% 12% 45%	8280
	11th to 20th	Day	11% 5% 2 6% 5% 5% 6% 5% 8% 13% 34%	8103
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 5% 8% 11% 40%	8340
August	1st to 10th	Day	11% 6% 3 7% 5% 5% 6% 5% 9% 11% 33%	6014
	11th to 20th	Day	8% 5% 2 7% 5% 6% 6% 5% 6% 9% 41%	5516
	21st to end	Day	9% 4 2 5% 3 4 4 3 6% 9% 52%	6080
September	1st to 10th	Day	13% 4 2 5% 3 4 4 3 6% 6% 51%	2520
	11th to 20th	Day	14% 6% 2 6% 4 4 4 3 4 8% 47%	2520
	21st to end	Day	20% 8% 3 5% 4 4 4 3 4 6% 38%	2247
October	1st to 10th	Day	16% 5% 2 6% 4 3 3 3 5% 6% 48%	2100
	11th to 20th	Day	18% 4 1 4 3 3 3 2 4 5% 53%	2100
	21st to end	Day	12% 5% 2 5% 3 4 3 3 5% 6% 53%	2280
November	1st to 10th	Day	14% 5% 1 4 3 4 3 3 4 6% 54%	1916
	11th to 20th	Day	13% 5% 2 5% 4 3 4 4 5% 7% 47%	1890
	21st to end	Day	14% 4 2 6% 4 3 3 3 5% 5% 51%	1770
December	1st to 10th	Day	10% 6% 2 5% 3 3 3 3 6% 6% 53%	2680
	11th to 20th	Day	18% 7% 2 6% 3 3 3 2 4 5% 47%	3070
	21st to end	Day	12% 6% 2 6% 3 4 4 3 5% 7% 48%	4048
January	1st to 10th	Night	11% 7% 2 5% 4 4 4 4 6% 7% 46%	8133
	11th to 20th	Night	13% 6% 2 6% 3 3 3 2 3 5% 54%	7680
	21st to end	Night	15% 7% 3 6% 4 3 4 3 5% 5% 47%	8401
February	1st to 10th	Night	15% 8% 2 5% 3 4 3 3 5% 6% 43%	2730
	11th to 20th	Night	20% 7% 2 5% 4 3 3 3 6% 6% 41%	2525
	21st to end	Night	16% 9% 3 5% 3 3 3 3 5% 6% 45%	2076
March	1st to 10th	Night	17% 6% 2 6% 3 3 3 3 4 6% 46%	5223
	11th to 20th	Night	12% 7% 2 4 3 3 4 3 5% 6% 50%	5090
	21st to end	Night	15% 8% 3 5% 4 3 4 3 4 6% 46%	5403
April	1st to 10th	Night	15% 6% 2 6% 4 4 5% 4 5% 7% 42%	2100
	11th to 20th	Night	11% 5% 2 5% 4 3 5% 3 5% 8% 48%	2075
	21st to end	Night	16% 5% 2 6% 4 4 4 3 5% 7% 45%	2100
May	1st to 10th	Night	15% 6% 2 7% 5% 5% 5% 4 6% 9% 37%	5758
	11th to 20th	Night	18% 6% 2 6% 3 4 4 3 5% 8% 41%	4760
	21st to end	Night	21% 7% 2 7% 5% 4 4 3 5% 7% 35%	5108
June	1st to 10th	Night	11% 5% 1 5% 4 6% 4 4 6% 9% 43%	1680
	11th to 20th	Night	11% 5% 2 6% 5% 5% 5% 4 6% 10% 41%	1680
	21st to end	Night	7% 4 2 6% 5% 5% 7% 5% 7% 10% 44%	1680
July	1st to 10th	Night	11% 5% 2 7% 5% 5% 5% 4 7% 9% 39%	4678
	11th to 20th	Night	11% 6% 3 7% 5% 5% 6% 5% 9% 12% 32%	4849
	21st to end	Night	12% 6% 3 8% 5% 5% 5% 5% 7% 9% 35%	5736
August	1st to 10th	Night	15% 7% 3 8% 4 5% 5% 4 7% 10% 32%	4135
	11th to 20th	Night	11% 6% 2 7% 5% 5% 5% 5% 7% 9% 39%	4484
	21st to end	Night	10% 5% 2 6% 4 4 5% 4 5% 8% 48%	5045
September	1st to 10th	Night	13% 5% 2 5% 4 4 4 3 5% 7% 49%	2100
	11th to 20th	Night	11% 4 2 6% 4 4 5% 4 6% 8% 46%	2100
	21st to end	Night	22% 8% 3 7% 4 4 4 4 5% 6% 34%	2369
October	1st to 10th	Night	16% 7% 2 5% 4 3 4 3 5% 6% 45%	2520
	11th to 20th	Night	18% 5% 2 4 3 3 4 2 3 5% 51%	2520
	21st to end	Night	15% 5% 2 5% 3 3 3 3 4 6% 51%	2737
November	1st to 10th	Night	13% 6% 2 5% 3 3 3 3 5% 6% 51%	2601
	11th to 20th	Night	16% 7% 2 6% 4 4 3 3 5% 5% 46%	2730
	21st to end	Night	13% 4 2 5% 4 4 4 3 5% 7% 50%	2846
December	1st to 10th	Night	10% 6% 2 5% 3 3 3 3 5% 6% 54%	4720
	11th to 20th	Night	19% 6% 2 7% 4 4 4 3 5% 6% 39%	5345
	21st to end	Night	11% 7% 3 6% 4 4 4 4 6% 8% 45%	7150

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	34% 4 9% 27% 20% 5%	4759
	11th to 20th	Day	36% 3 6% 20% 27% 7%	5280
	21st to end	Day	40% 5% 9% 30% 13% 2	5780
February	1st to 10th	Day	41% 5% 12% 25% 14% 2	1890
	11th to 20th	Day	41% 5% 9% 22% 19% 4	1989
	21st to end	Day	44% 5% 13% 19% 16% 4	1730
March	1st to 10th	Day	39% 6% 10% 19% 19% 7%	4832
	11th to 20th	Day	31% 5% 10% 25% 22% 7%	5090
	21st to end	Day	40% 6% 11% 19% 18% 6%	5769
April	1st to 10th	Day	33% 5% 15% 22% 19% 5%	2520
	11th to 20th	Day	33% 6% 12% 25% 19% 5%	2494
	21st to end	Day	36% 6% 12% 25% 16% 5%	2520
May	1st to 10th	Day	41% 8% 13% 22% 15% 1	7170
	11th to 20th	Day	37% 8% 13% 27% 14% 1	8102
	21st to end	Day	42% 7% 12% 22% 15% 2	9061
June	1st to 10th	Day	32% 8% 16% 27% 15% 3	2940
	11th to 20th	Day	29% 10% 17% 25% 16% 2	2940
	21st to end	Day	30% 9% 16% 25% 18% 1	2940
July	1st to 10th	Day	30% 11% 21% 23% 12% 2	8210
	11th to 20th	Day	39% 11% 19% 23% 7% 1	8028
	21st to end	Day	35% 10% 15% 22% 17% 1	8156
August	1st to 10th	Day	41% 12% 20% 21% 5% 1	6001
	11th to 20th	Day	36% 11% 18% 23% 11%	5552
	21st to end	Day	29% 7% 18% 29% 16% 2	6080
September	1st to 10th	Day	32% 8% 17% 22% 17% 4	2520
	11th to 20th	Day	37% 6% 11% 26% 18% 3	2520
	21st to end	Day	47% 7% 10% 20% 14% 3	2247
October	1st to 10th	Day	33% 5% 9% 22% 26% 4	3360
	11th to 20th	Day	27% 4 6% 23% 31% 10%	3340
	21st to end	Day	22% 4 9% 29% 27% 10%	3618
November	1st to 10th	Day	33% 5% 9% 28% 20% 4	1916
	11th to 20th	Day	36% 7% 11% 20% 22% 5%	1890
	21st to end	Day	36% 4 10% 28% 19% 3	1770
December	1st to 10th	Day	32% 6% 12% 29% 19% 4	2680
	11th to 20th	Day	42% 3 12% 23% 16% 4	3066
	21st to end	Day	36% 6% 15% 28% 15% 1	4048
January	1st to 10th	Night	37% 4 11% 23% 21% 4	8134
	11th to 20th	Night	35% 3 5% 25% 24% 7%	7680
	21st to end	Night	40% 4 8% 28% 17% 3	8401
February	1st to 10th	Night	41% 5% 11% 24% 17% 2	2730
	11th to 20th	Night	43% 5% 9% 21% 18% 5%	2527
	21st to end	Night	40% 4 9% 22% 19% 6%	2076
March	1st to 10th	Night	39% 5% 8% 22% 18% 8%	5223
	11th to 20th	Night	33% 5% 10% 23% 22% 7%	5090
	21st to end	Night	40% 4 8% 24% 17% 7%	5403
April	1st to 10th	Night	41% 6% 11% 18% 20% 5%	2100
	11th to 20th	Night	34% 6% 11% 22% 21% 5%	2075
	21st to end	Night	38% 6% 13% 23% 16% 4	2100
May	1st to 10th	Night	43% 7% 13% 25% 10% 2	5788
	11th to 20th	Night	41% 7% 13% 24% 14%	4761
	21st to end	Night	47% 7% 11% 19% 15% 1	5115
June	1st to 10th	Night	38% 8% 11% 24% 18% 2	1680
	11th to 20th	Night	37% 10% 13% 25% 14% 2	1680
	21st to end	Night	33% 10% 15% 21% 17% 3	1680
July	1st to 10th	Night	40% 10% 15% 20% 13% 2	4640
	11th to 20th	Night	42% 11% 21% 20% 7%	4804
	21st to end	Night	43% 9% 14% 21% 13%	5606
August	1st to 10th	Night	47% 10% 19% 19% 6%	4124
	11th to 20th	Night	39% 10% 18% 23% 9%	4514
	21st to end	Night	34% 7% 13% 25% 20% 1	5045
September	1st to 10th	Night	35% 8% 15% 22% 17% 4	2100
	11th to 20th	Night	34% 7% 12% 25% 20% 2	2100
	21st to end	Night	49% 8% 10% 16% 15% 2	2369
October	1st to 10th	Night	36% 6% 10% 22% 22% 4	4040
	11th to 20th	Night	27% 4 9% 22% 30% 8%	4019
	21st to end	Night	22% 3 9% 32% 25% 10%	4349
November	1st to 10th	Night	35% 5% 11% 25% 21% 4	2601
	11th to 20th	Night	40% 5% 8% 21% 19% 6%	2730
	21st to end	Night	33% 6% 10% 26% 21% 4	2846
December	1st to 10th	Night	31% 4 12% 28% 22% 3	4720
	11th to 20th	Night	47% 4 11% 21% 13% 5%	5348
	21st to end	Night	37% 5% 14% 28% 15% 1	7150

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% 29% 38% 11%	237
	11th to 20th	Day	15% 7% 29% 38% 10%	330
	21st to end	Day	16% 4 23% 43% 13% 1	363
February	1st to 10th	Day	16% 6% 18% 45% 15% 1	330
	11th to 20th	Day	25% 5% 29% 33% 9%	468
	21st to end	Day	21% 5% 26% 37% 11% 1	446
March	1st to 10th	Day	16% 5% 27% 37% 14% 2	540
	11th to 20th	Day	16% 5% 25% 39% 12% 2	540
	21st to end	Day	17% 5% 25% 36% 15% 2	594
April	1st to 10th	Day	15% 4 24% 36% 17% 3	540
	11th to 20th	Day	9% 4 19% 37% 26% 6%	532
	21st to end	Day	15% 4 18% 33% 26% 4	540
May	1st to 10th	Day	17% 3 18% 34% 23% 5%	543
	11th to 20th	Day	17% 3 13% 33% 26% 8%	567
	21st to end	Day	19% 3 8% 25% 30% 15%	617
June	1st to 10th	Day	10% 2 8% 29% 32% 19%	570
	11th to 20th	Day	10% 2 7% 28% 39% 15%	570
	21st to end	Day	8% 3 8% 24% 39% 18%	570
July	1st to 10th	Day	10% 3 4 21% 38% 25%	565
	11th to 20th	Day	5% 2 4 15% 49% 26%	564
	21st to end	Day	8% 2 6% 23% 42% 19%	620
August	1st to 10th	Day	12% 1 6% 22% 40% 18%	566
	11th to 20th	Day	10% 2 6% 22% 42% 18%	559
	21st to end	Day	9% 2 4 27% 37% 21%	627
September	1st to 10th	Day	14% 1 8% 22% 33% 22%	570
	11th to 20th	Day	14% 3 7% 20% 36% 21%	570
	21st to end	Day	27% 3 15% 23% 24% 9%	570
October	1st to 10th	Day	17% 3 10% 27% 27% 16%	570
	11th to 20th	Day	19% 2 16% 29% 25% 8%	570
	21st to end	Day	13% 4 20% 30% 26% 7%	615
November	1st to 10th	Day	16% 3 21% 33% 20% 7%	461
	11th to 20th	Day	13% 6% 30% 31% 17% 3	430
	21st to end	Day	13% 6% 25% 32% 19% 5%	310
December	1st to 10th	Day	18% 3 25% 37% 16% 1	220
	11th to 20th	Day	19% 5% 24% 35% 16% 1	220
	21st to end	Day	16% 3 25% 38% 16% 2	242
January	1st to 10th	Night	17% 12% 38% 28% 6%	840
	11th to 20th	Night	19% 10% 33% 30% 8%	840
	21st to end	Night	19% 10% 36% 32% 3	924
February	1st to 10th	Night	18% 7% 34% 35% 6%	840
	11th to 20th	Night	21% 10% 39% 26% 3	823
	21st to end	Night	20% 8% 33% 34% 5% 1	692
March	1st to 10th	Night	17% 6% 33% 34% 9%	840
	11th to 20th	Night	17% 6% 33% 33% 9% 2	840
	21st to end	Night	18% 5% 31% 38% 8% 1	924
April	1st to 10th	Night	16% 6% 34% 32% 11% 1	840
	11th to 20th	Night	13% 4 25% 40% 16% 1	831
	21st to end	Night	18% 4 22% 40% 15% 1	840
May	1st to 10th	Night	16% 5% 24% 39% 15% 1	816
	11th to 20th	Night	14% 4 22% 39% 19% 1	459
	21st to end	Night	16% 3 12% 29% 34% 5%	455
June	1st to 10th	Night	11% 2 15% 34% 34% 4	420
	11th to 20th	Night	12% 3 12% 37% 31% 5%	420
	21st to end	Night	6% 2 12% 40% 34% 6%	420
July	1st to 10th	Night	11% 1 9% 30% 40% 8%	410
	11th to 20th	Night	6% 1 6% 33% 45% 10%	463
	21st to end	Night	8% 2 8% 35% 42% 5%	690
August	1st to 10th	Night	11% 2 7% 39% 35% 6%	627
	11th to 20th	Night	12% 3 9% 33% 36% 7%	795
	21st to end	Night	12% 2 8% 31% 37% 9%	924
September	1st to 10th	Night	14% 2 9% 31% 35% 9%	840
	11th to 20th	Night	12% 3 10% 28% 39% 8%	840
	21st to end	Night	25% 3 14% 30% 25% 3	840
October	1st to 10th	Night	19% 4 16% 28% 27% 8%	840
	11th to 20th	Night	19% 6% 23% 28% 21% 2	840
	21st to end	Night	18% 6% 25% 29% 19% 3	913
November	1st to 10th	Night	15% 6% 24% 35% 17% 4	820
	11th to 20th	Night	18% 8% 29% 31% 12% 1	840
	21st to end	Night	13% 10% 30% 33% 14% 1	840
December	1st to 10th	Night	19% 7% 34% 28% 9% 2	840
	11th to 20th	Night	18% 8% 37% 29% 9%	840
	21st to end	Night	17% 8% 32% 34% 10%	924

Page generated at 2026-10-26 04:37:50. Version ac07

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