Cooney Reservoir State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cooney Reservoir State Park clear sky chart from 2005-11-06 to 2024-01-14.

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	8% 7% 3 5% 5% 3 5% 5% 6% 8% 45%	75031
	Night	7% 8% 3 6% 5% 3 5% 5% 6% 8% 45%	74707
Transparency	Day	35% 7% 14% 23% 16% 5%	74729
	Night	35% 7% 14% 25% 15% 4	74531
Seeing	Day	12% 10% 32% 30% 14% 2	14598
	Night	11% 6% 33% 37% 12% 1	24328

By Month

Percentage Cloud Cover SW (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	4 7% 4 7% 6% 5% 5% 5% 8% 9% 40%	1382
	11th to 20th	Day	4 9% 3 7% 5% 3 5% 6% 7% 8% 42%	1509
	21st to end	Day	5% 10% 4 8% 7% 4 4 4 6% 8% 39%	1782
February	1st to 10th	Day	5% 11% 6% 8% 7% 4 5% 5% 6% 8% 35%	1620
	11th to 20th	Day	3 12% 5% 8% 9% 4 6% 5% 5% 7% 35%	1575
	21st to end	Day	3 9% 5% 10% 8% 4 6% 5% 6% 6% 38%	1340
March	1st to 10th	Day	4 8% 5% 8% 6% 3 4 5% 6% 10% 40%	1962
	11th to 20th	Day	6% 7% 4 8% 5% 3 5% 6% 6% 9% 40%	1980
	21st to end	Day	10% 10% 4 7% 6% 3 5% 6% 7% 8% 34%	2178
April	1st to 10th	Day	10% 11% 4 7% 6% 3 6% 5% 6% 9% 35%	2147
	11th to 20th	Day	11% 9% 5% 7% 6% 4 6% 5% 6% 7% 33%	2204
	21st to end	Day	13% 11% 3 6% 6% 3 5% 5% 5% 8% 33%	2340
May	1st to 10th	Day	13% 9% 2 5% 6% 4 6% 6% 6% 6% 36%	2402
	11th to 20th	Day	15% 7% 3 5% 5% 3 6% 5% 7% 9% 34%	2478
	21st to end	Day	19% 8% 3 6% 5% 3 6% 6% 8% 9% 27%	2724
June	1st to 10th	Day	14% 5% 2 5% 4 3 5% 6% 8% 9% 39%	2528
	11th to 20th	Day	9% 5% 3 5% 6% 4 6% 6% 7% 8% 40%	2700
	21st to end	Day	4 3 1 3 4 3 5% 5% 7% 8% 57%	2700
July	1st to 10th	Day	5% 2 1 3 3 3 5% 7% 6% 12% 53%	2700
	11th to 20th	Day	2 2 1 3 4 3 5% 6% 7% 8% 59%	2574
	21st to end	Day	3 2 1 3 3 3 5% 5% 6% 8% 60%	2673
August	1st to 10th	Day	5% 3 2 3 4 4 4 5% 6% 8% 55%	2328
	11th to 20th	Day	6% 3 1 3 4 3 4 5% 6% 7% 58%	2299
	21st to end	Day	5% 3 2 3 4 3 4 5% 7% 8% 56%	2512
September	1st to 10th	Day	7% 4 2 3 3 2 3 4 5% 6% 62%	2160
	11th to 20th	Day	10% 4 2 3 3 2 4 4 6% 8% 54%	2078
	21st to end	Day	11% 4 1 3 3 2 4 4 5% 6% 56%	1945
October	1st to 10th	Day	12% 8% 3 5% 4 3 4 4 5% 6% 45%	1800
	11th to 20th	Day	10% 8% 3 5% 4 3 4 3 4 5% 51%	1800
	21st to end	Day	8% 9% 3 4 5% 3 4 4 6% 7% 48%	1980
November	1st to 10th	Day	7% 9% 3 5% 5% 4 4 5% 5% 7% 44%	1511
	11th to 20th	Day	4 8% 3 5% 6% 4 5% 5% 5% 9% 46%	1520
	21st to end	Day	5% 8% 4 6% 4 3 5% 4 6% 8% 46%	1520
December	1st to 10th	Day	3 7% 5% 9% 8% 3 5% 6% 6% 8% 41%	1520
	11th to 20th	Day	3 6% 4 6% 6% 3 6% 7% 9% 11% 40%	1926
	21st to end	Day	4 8% 3 6% 5% 3 5% 5% 6% 5% 48%	2634
January	1st to 10th	Night	4 8% 3 7% 6% 3 6% 5% 7% 9% 42%	2774
	11th to 20th	Night	5% 9% 4 8% 5% 3 4 4 6% 7% 44%	2537
	21st to end	Night	4 12% 4 8% 6% 3 4 5% 7% 9% 40%	2574
February	1st to 10th	Night	5% 13% 6% 10% 6% 3 5% 5% 5% 7% 35%	2340
	11th to 20th	Night	4 15% 6% 9% 6% 3 5% 5% 5% 7% 35%	2272
	21st to end	Night	4 10% 6% 9% 7% 4 4 5% 6% 7% 39%	1916
March	1st to 10th	Night	4 8% 4 9% 6% 3 5% 6% 6% 8% 42%	1995
	11th to 20th	Night	7% 8% 4 5% 6% 3 4 4 7% 10% 42%	1980
	21st to end	Night	11% 11% 4 7% 6% 3 6% 5% 6% 7% 34%	2178
April	1st to 10th	Night	9% 9% 3 6% 6% 3 5% 5% 7% 7% 40%	1812
	11th to 20th	Night	11% 12% 4 7% 7% 3 5% 5% 7% 6% 32%	1700
	21st to end	Night	14% 11% 3 6% 5% 3 5% 5% 4 7% 38%	1620
May	1st to 10th	Night	15% 9% 3 6% 5% 3 5% 4 6% 7% 39%	1558
	11th to 20th	Night	16% 8% 2 5% 5% 3 5% 5% 6% 8% 38%	1417
	21st to end	Night	18% 8% 4 6% 4 3 5% 6% 8% 10% 30%	1552
June	1st to 10th	Night	12% 6% 2 4 4 2 8% 6% 7% 9% 40%	1426
	11th to 20th	Night	10% 6% 2 4 5% 4 5% 5% 7% 8% 43%	1260
	21st to end	Night	6% 3 1 4 3 2 4 5% 7% 8% 55%	1260
July	1st to 10th	Night	6% 2 1 3 3 3 5% 6% 6% 8% 57%	1260
	11th to 20th	Night	3 3 2 2 3 2 5% 5% 6% 10% 60%	1384
	21st to end	Night	3 2 1 2 4 2 4 5% 7% 8% 60%	1642
August	1st to 10th	Night	4 3 1 5% 4 3 6% 6% 7% 10% 52%	1611
	11th to 20th	Night	4 3 1 2 4 3 4 5% 6% 8% 59%	1602
	21st to end	Night	8% 3 2 3 4 2 4 5% 7% 8% 53%	1844
September	1st to 10th	Night	7% 4 1 3 3 2 4 4 5% 6% 61%	1800
	11th to 20th	Night	10% 5% 2 3 3 2 3 3 5% 7% 57%	1880
	21st to end	Night	14% 4 2 3 3 2 3 4 5% 6% 56%	2013
October	1st to 10th	Night	16% 8% 3 4 4 3 4 3 5% 7% 43%	2160
	11th to 20th	Night	12% 9% 2 4 4 3 4 4 3 5% 51%	2160
	21st to end	Night	8% 8% 2 5% 5% 3 4 4 4 7% 50%	2376
November	1st to 10th	Night	8% 10% 3 6% 4 3 4 5% 6% 7% 44%	2548
	11th to 20th	Night	6% 8% 3 5% 5% 2 4 5% 6% 8% 47%	2660
	21st to end	Night	5% 8% 3 6% 5% 3 4 5% 6% 8% 47%	2660
December	1st to 10th	Night	4 8% 4 9% 7% 4 6% 4 5% 9% 40%	2660
	11th to 20th	Night	4 6% 3 6% 5% 4 5% 5% 6% 9% 48%	3271
	21st to end	Night	3 9% 4 6% 5% 3 4 4 6% 7% 48%	5005

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	37% 10% 15% 27% 10% 1	1382
	11th to 20th	Day	35% 9% 18% 25% 11% 3	1509
	21st to end	Day	40% 7% 14% 25% 12% 2	1782
February	1st to 10th	Day	45% 7% 17% 20% 10% 1	1620
	11th to 20th	Day	46% 7% 15% 19% 10% 2	1584
	21st to end	Day	44% 6% 13% 19% 16% 3	1340
March	1st to 10th	Day	36% 9% 16% 26% 13%	1962
	11th to 20th	Day	37% 9% 16% 23% 12% 2	1980
	21st to end	Day	46% 10% 15% 23% 6% 1	2178
April	1st to 10th	Day	45% 8% 14% 20% 11% 2	2147
	11th to 20th	Day	47% 8% 15% 23% 7% 1	2207
	21st to end	Day	48% 8% 12% 22% 9% 1	2340
May	1st to 10th	Day	44% 8% 12% 24% 12%	2402
	11th to 20th	Day	44% 10% 14% 22% 9%	2482
	21st to end	Day	49% 12% 17% 17% 6%	2724
June	1st to 10th	Day	38% 10% 19% 22% 10% 1	2528
	11th to 20th	Day	36% 11% 16% 19% 15% 3	2700
	21st to end	Day	22% 7% 15% 26% 22% 8%	2700
July	1st to 10th	Day	21% 8% 14% 28% 24% 7%	2626
	11th to 20th	Day	19% 6% 11% 21% 28% 15%	2496
	21st to end	Day	18% 6% 9% 21% 29% 17%	2524
August	1st to 10th	Day	25% 7% 10% 26% 20% 11%	2313
	11th to 20th	Day	22% 5% 10% 28% 26% 9%	2299
	21st to end	Day	24% 5% 10% 23% 26% 12%	2512
September	1st to 10th	Day	23% 5% 8% 20% 32% 12%	2160
	11th to 20th	Day	27% 6% 12% 24% 26% 6%	2078
	21st to end	Day	27% 5% 11% 28% 24% 6%	1945
October	1st to 10th	Day	39% 7% 11% 23% 16% 4	1800
	11th to 20th	Day	34% 5% 13% 28% 14% 5%	1800
	21st to end	Day	34% 6% 16% 27% 16% 2	1980
November	1st to 10th	Day	38% 6% 15% 22% 15% 4	1511
	11th to 20th	Day	33% 7% 18% 25% 15% 2	1520
	21st to end	Day	35% 5% 15% 26% 17% 2	1520
December	1st to 10th	Day	38% 7% 15% 25% 11% 3	1520
	11th to 20th	Day	29% 11% 26% 24% 8% 1	1924
	21st to end	Day	34% 6% 11% 26% 17% 7%	2634
January	1st to 10th	Night	36% 8% 18% 25% 11% 2	2774
	11th to 20th	Night	37% 7% 18% 23% 12% 3	2537
	21st to end	Night	39% 7% 15% 24% 13% 1	2574
February	1st to 10th	Night	46% 7% 15% 22% 9% 1	2340
	11th to 20th	Night	47% 7% 14% 19% 11% 1	2273
	21st to end	Night	42% 7% 14% 22% 13% 2	1916
March	1st to 10th	Night	37% 8% 16% 24% 12% 2	1995
	11th to 20th	Night	34% 8% 17% 27% 13% 2	1980
	21st to end	Night	46% 8% 15% 24% 6% 1	2178
April	1st to 10th	Night	41% 8% 17% 21% 11% 3	1812
	11th to 20th	Night	48% 8% 13% 24% 7% 1	1700
	21st to end	Night	45% 8% 13% 24% 10%	1620
May	1st to 10th	Night	43% 8% 11% 26% 10% 1	1558
	11th to 20th	Night	42% 10% 15% 22% 11%	1418
	21st to end	Night	46% 10% 20% 18% 6%	1552
June	1st to 10th	Night	37% 11% 19% 23% 9% 2	1426
	11th to 20th	Night	35% 9% 16% 23% 13% 4	1260
	21st to end	Night	23% 7% 16% 27% 20% 6%	1260
July	1st to 10th	Night	21% 5% 12% 34% 22% 5%	1225
	11th to 20th	Night	17% 7% 12% 23% 25% 16%	1340
	21st to end	Night	18% 5% 13% 21% 28% 15%	1551
August	1st to 10th	Night	24% 7% 13% 26% 20% 9%	1602
	11th to 20th	Night	20% 6% 9% 29% 25% 11%	1602
	21st to end	Night	25% 6% 10% 22% 26% 11%	1844
September	1st to 10th	Night	23% 5% 9% 22% 26% 15%	1800
	11th to 20th	Night	27% 6% 10% 27% 23% 7%	1880
	21st to end	Night	28% 5% 10% 27% 24% 6%	2013
October	1st to 10th	Night	39% 7% 10% 24% 16% 3	2160
	11th to 20th	Night	35% 6% 10% 28% 18% 4	2160
	21st to end	Night	32% 6% 14% 28% 17% 3	2376
November	1st to 10th	Night	37% 6% 15% 25% 14% 3	2548
	11th to 20th	Night	32% 7% 16% 28% 14% 2	2660
	21st to end	Night	33% 6% 15% 28% 15% 3	2660
December	1st to 10th	Night	39% 8% 15% 24% 12% 3	2660
	11th to 20th	Night	30% 8% 20% 34% 8%	3272
	21st to end	Night	33% 6% 13% 28% 15% 5%	5005

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	9% 13% 39% 31% 9%	205
	11th to 20th	Day	10% 11% 45% 23% 10%	249
	21st to end	Day	11% 14% 48% 20% 4 2	264
February	1st to 10th	Day	14% 16% 57% 12% 1	240
	11th to 20th	Day	11% 18% 50% 17% 5% 1	240
	21st to end	Day	9% 15% 47% 24% 6% 1	198
March	1st to 10th	Day	11% 16% 44% 26% 3 1	402
	11th to 20th	Day	9% 17% 41% 27% 5%	420
	21st to end	Day	18% 17% 31% 24% 8% 2	462
April	1st to 10th	Day	17% 18% 36% 25% 3	420
	11th to 20th	Day	15% 22% 38% 21% 3 1	412
	21st to end	Day	23% 14% 29% 25% 9% 2	420
May	1st to 10th	Day	18% 12% 24% 28% 15% 2	485
	11th to 20th	Day	21% 6% 26% 27% 16% 4	625
	21st to end	Day	23% 7% 21% 24% 20% 6%	679
June	1st to 10th	Day	13% 4 25% 31% 20% 6%	630
	11th to 20th	Day	12% 11% 30% 32% 14% 1	630
	21st to end	Day	6% 5% 26% 36% 23% 3	630
July	1st to 10th	Day	5% 4 23% 39% 26% 3	621
	11th to 20th	Day	3 4 27% 42% 22% 2	618
	21st to end	Day	3 2 23% 42% 25% 4	615
August	1st to 10th	Day	6% 4 25% 40% 22% 3	447
	11th to 20th	Day	7% 3 26% 36% 25% 2	437
	21st to end	Day	4 5% 23% 42% 21% 5%	495
September	1st to 10th	Day	7% 7% 28% 38% 17% 3	450
	11th to 20th	Day	14% 4 23% 37% 16% 5%	450
	21st to end	Day	14% 9% 28% 32% 15% 2	415
October	1st to 10th	Day	15% 7% 28% 31% 15% 4	270
	11th to 20th	Day	15% 10% 36% 26% 12% 1	270
	21st to end	Day	14% 14% 41% 20% 8% 2	297
November	1st to 10th	Day	16% 10% 40% 24% 9% 1	270
	11th to 20th	Day	10% 13% 47% 23% 7% 1	270
	21st to end	Day	11% 14% 42% 28% 5%	270
December	1st to 10th	Day	6% 14% 51% 23% 6%	270
	11th to 20th	Day	10% 10% 54% 22% 4	270
	21st to end	Day	12% 11% 45% 24% 8% 1	252
January	1st to 10th	Night	8% 7% 49% 32% 4	950
	11th to 20th	Night	10% 11% 45% 27% 7%	886
	21st to end	Night	10% 7% 51% 26% 6%	792
February	1st to 10th	Night	10% 10% 45% 28% 7% 1	720
	11th to 20th	Night	11% 8% 44% 31% 6% 1	704
	21st to end	Night	9% 7% 42% 34% 7% 1	592
March	1st to 10th	Night	8% 6% 42% 34% 10% 1	720
	11th to 20th	Night	11% 4 36% 38% 10% 1	720
	21st to end	Night	17% 7% 28% 36% 11% 1	792
April	1st to 10th	Night	13% 8% 31% 40% 8% 1	552
	11th to 20th	Night	17% 8% 33% 33% 8%	533
	21st to end	Night	20% 6% 22% 38% 14% 1	540
May	1st to 10th	Night	20% 8% 22% 36% 14% 1	540
	11th to 20th	Night	19% 5% 19% 36% 20% 1	531
	21st to end	Night	21% 3 18% 38% 19% 2	584
June	1st to 10th	Night	13% 3 21% 40% 21% 2	526
	11th to 20th	Night	12% 4 23% 46% 16% 1	360
	21st to end	Night	7% 2 16% 52% 22% 1	360
July	1st to 10th	Night	8% 1 8% 48% 33% 1	350
	11th to 20th	Night	4 3 16% 57% 19%	470
	21st to end	Night	4 1 15% 56% 23% 1	591
August	1st to 10th	Night	5% 2 14% 54% 23% 1	537
	11th to 20th	Night	5% 2 14% 54% 23% 2	534
	21st to end	Night	9% 2 14% 51% 22% 2	594
September	1st to 10th	Night	8% 3 19% 47% 21% 2	540
	11th to 20th	Night	10% 1 18% 49% 19% 2	620
	21st to end	Night	16% 4 18% 42% 18% 2	720
October	1st to 10th	Night	21% 4 22% 36% 15% 2	720
	11th to 20th	Night	17% 7% 30% 33% 13% 2	720
	21st to end	Night	11% 7% 35% 35% 10% 2	792
November	1st to 10th	Night	12% 7% 37% 36% 7% 1	893
	11th to 20th	Night	10% 8% 47% 30% 5%	950
	21st to end	Night	9% 7% 46% 34% 4	950
December	1st to 10th	Night	8% 7% 46% 33% 6%	950
	11th to 20th	Night	7% 5% 51% 30% 6% 1	950
	21st to end	Night	9% 8% 47% 30% 6%	1045

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