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 2024-11-12.

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	7% 7% 2 6% 4 4 5% 4 6% 8% 46%	105932
	Night	7% 8% 3 7% 4 4 4 4 6% 7% 46%	101929
Transparency	Day	33% 7% 13% 24% 18% 5%	105670
	Night	34% 7% 13% 25% 16% 5%	101781
Seeing	Day	12% 10% 32% 30% 14% 2	15800
	Night	11% 6% 33% 38% 12% 1	25352

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	3 8% 4 8% 6% 7% 6% 5% 8% 8% 39%	2311
	11th to 20th	Day	3 8% 3 13% 7% 7% 7% 5% 8% 7% 33%	2613
	21st to end	Day	3 7% 3 7% 4 5% 3 4 5% 8% 52%	3146
February	1st to 10th	Day	5% 13% 5% 9% 6% 5% 4 4 6% 8% 35%	1710
	11th to 20th	Day	3 13% 5% 10% 8% 5% 5% 4 5% 7% 34%	1665
	21st to end	Day	3 9% 4 10% 7% 6% 5% 5% 6% 6% 38%	1422
March	1st to 10th	Day	3 7% 3 8% 5% 4 5% 4 7% 10% 43%	3414
	11th to 20th	Day	5% 9% 3 9% 4 4 4 4 6% 7% 46%	3490
	21st to end	Day	10% 17% 5% 10% 5% 5% 5% 4 6% 8% 25%	3825
April	1st to 10th	Day	9% 13% 3 7% 5% 5% 5% 4 7% 8% 35%	2267
	11th to 20th	Day	11% 10% 5% 8% 6% 5% 5% 4 7% 7% 34%	2329
	21st to end	Day	13% 11% 3 7% 5% 5% 5% 4 6% 7% 33%	2470
May	1st to 10th	Day	16% 16% 3 7% 5% 4 5% 4 6% 6% 28%	4228
	11th to 20th	Day	11% 6% 2 6% 4 5% 5% 5% 8% 9% 39%	4388
	21st to end	Day	15% 7% 2 7% 5% 5% 5% 5% 7% 8% 34%	4825
June	1st to 10th	Day	13% 6% 2 5% 4 4 6% 4 8% 9% 39%	2669
	11th to 20th	Day	9% 6% 2 6% 5% 5% 6% 5% 7% 8% 41%	2850
	21st to end	Day	4 3 1 4 3 4 5% 4 7% 8% 57%	2850
July	1st to 10th	Day	4 2 1 3 3 4 5% 5% 6% 9% 58%	4740
	11th to 20th	Day	2 2 1 3 3 4 5% 5% 7% 8% 61%	4510
	21st to end	Day	2 2 1 3 3 4 5% 5% 7% 8% 59%	4680
August	1st to 10th	Day	6% 4 2 5% 4 5% 5% 4 7% 8% 48%	4092
	11th to 20th	Day	4 3 1 4 3 4 5% 5% 7% 8% 55%	4028
	21st to end	Day	5% 2 1 3 3 3 4 4 6% 6% 61%	4407
September	1st to 10th	Day	7% 4 1 4 3 3 3 3 5% 6% 62%	2280
	11th to 20th	Day	10% 5% 1 4 3 3 4 4 6% 8% 52%	2193
	21st to end	Day	10% 4 1 3 3 3 3 3 5% 6% 58%	2053
October	1st to 10th	Day	7% 5% 2 4 2 2 3 3 3 5% 63%	3170
	11th to 20th	Day	8% 6% 2 4 3 3 3 2 4 4 61%	3150
	21st to end	Day	6% 9% 3 5% 4 4 4 3 8% 8% 47%	3438
November	1st to 10th	Day	7% 10% 3 6% 4 5% 4 4 5% 7% 45%	1591
	11th to 20th	Day	4 9% 3 5% 5% 5% 5% 4 5% 9% 46%	1528
	21st to end	Day	5% 9% 3 7% 4 4 5% 3 6% 7% 46%	1520
December	1st to 10th	Day	2 8% 4 10% 7% 5% 4 5% 7% 8% 40%	1520
	11th to 20th	Day	3 6% 3 6% 5% 4 6% 6% 9% 11% 40%	1926
	21st to end	Day	4 9% 3 7% 5% 5% 5% 4 6% 5% 48%	2634
January	1st to 10th	Night	3 8% 3 8% 5% 5% 5% 4 7% 9% 43%	4628
	11th to 20th	Night	3 9% 4 13% 8% 6% 5% 4 6% 6% 35%	4384
	21st to end	Night	3 10% 3 7% 5% 4 4 4 7% 8% 45%	4521
February	1st to 10th	Night	5% 14% 6% 11% 6% 4 5% 4 5% 7% 34%	2470
	11th to 20th	Night	3 16% 5% 11% 6% 4 4 4 6% 7% 35%	2402
	21st to end	Night	3 11% 5% 10% 6% 4 4 5% 6% 6% 39%	2032
March	1st to 10th	Night	3 7% 4 10% 6% 4 5% 4 6% 7% 44%	3445
	11th to 20th	Night	6% 9% 3 6% 5% 4 4 3 7% 10% 45%	3490
	21st to end	Night	9% 17% 6% 11% 6% 5% 5% 4 6% 7% 24%	3828
April	1st to 10th	Night	9% 11% 3 6% 5% 4 4 5% 7% 6% 39%	1912
	11th to 20th	Night	11% 13% 4 9% 5% 5% 5% 4 7% 6% 32%	1795
	21st to end	Night	14% 11% 3 6% 5% 4 5% 4 4 7% 37%	1710
May	1st to 10th	Night	17% 14% 3 7% 4 4 4 4 5% 6% 32%	2742
	11th to 20th	Night	11% 7% 2 6% 4 5% 5% 4 6% 8% 42%	2517
	21st to end	Night	15% 8% 3 7% 4 4 5% 5% 7% 10% 33%	2762
June	1st to 10th	Night	12% 7% 2 5% 4 4 7% 5% 8% 9% 39%	1505
	11th to 20th	Night	10% 7% 2 5% 5% 5% 4 5% 7% 8% 44%	1330
	21st to end	Night	6% 3 1 5% 2 4 4 4 7% 8% 56%	1330
July	1st to 10th	Night	5% 3 1 5% 3 4 4 5% 7% 7% 56%	2220
	11th to 20th	Night	2 3 1 3 3 4 4 3 7% 8% 60%	2442
	21st to end	Night	3 2 1 3 3 3 4 4 8% 11% 57%	2880
August	1st to 10th	Night	6% 4 2 5% 3 5% 5% 5% 7% 9% 49%	2847
	11th to 20th	Night	3 4 1 4 4 5% 6% 5% 7% 9% 52%	2811
	21st to end	Night	8% 2 1 3 2 2 3 3 5% 7% 63%	3260
September	1st to 10th	Night	7% 4 1 4 3 2 4 3 5% 6% 62%	1900
	11th to 20th	Night	9% 5% 1 4 3 3 3 3 5% 7% 56%	1985
	21st to end	Night	13% 4 2 3 2 2 3 3 5% 6% 57%	2125
October	1st to 10th	Night	9% 5% 2 3 3 2 2 2 4 6% 62%	3800
	11th to 20th	Night	10% 8% 2 4 3 3 3 3 3 5% 57%	3778
	21st to end	Night	9% 8% 2 5% 3 3 3 3 4 6% 53%	4120
November	1st to 10th	Night	8% 10% 3 7% 4 4 4 4 5% 7% 45%	2687
	11th to 20th	Night	6% 8% 3 6% 4 3 4 4 6% 7% 47%	2675
	21st to end	Night	5% 9% 2 7% 4 4 4 4 6% 8% 47%	2660
December	1st to 10th	Night	4 9% 4 10% 6% 6% 5% 3 6% 8% 40%	2660
	11th to 20th	Night	3 6% 3 7% 5% 5% 5% 5% 6% 8% 48%	3271
	21st to end	Night	3 10% 3 7% 4 4 4 3 6% 7% 47%	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	35% 11% 13% 33% 7% 1	2311
	11th to 20th	Day	42% 10% 16% 18% 12% 2	2613
	21st to end	Day	29% 8% 22% 29% 12% 1	3146
February	1st to 10th	Day	46% 7% 16% 20% 10% 1	1710
	11th to 20th	Day	46% 7% 15% 19% 11% 2	1674
	21st to end	Day	42% 7% 14% 20% 15% 3	1422
March	1st to 10th	Day	30% 8% 15% 28% 18% 2	3414
	11th to 20th	Day	33% 9% 20% 27% 10% 1	3490
	21st to end	Day	51% 13% 15% 16% 3	3825
April	1st to 10th	Day	45% 8% 14% 21% 11% 2	2267
	11th to 20th	Day	46% 7% 15% 23% 7% 1	2332
	21st to end	Day	47% 8% 12% 22% 10% 1	2470
May	1st to 10th	Day	52% 7% 10% 20% 9% 1	4228
	11th to 20th	Day	34% 9% 15% 29% 12% 1	4392
	21st to end	Day	42% 11% 16% 24% 7%	4825
June	1st to 10th	Day	37% 10% 19% 23% 10% 1	2669
	11th to 20th	Day	35% 11% 16% 20% 15% 3	2850
	21st to end	Day	22% 7% 14% 27% 22% 8%	2850
July	1st to 10th	Day	20% 6% 9% 27% 28% 9%	4666
	11th to 20th	Day	18% 5% 7% 18% 34% 19%	4432
	21st to end	Day	19% 6% 7% 20% 29% 19%	4532
August	1st to 10th	Day	30% 7% 10% 22% 19% 12%	4078
	11th to 20th	Day	23% 6% 8% 29% 28% 6%	4067
	21st to end	Day	21% 5% 8% 28% 29% 10%	4406
September	1st to 10th	Day	23% 5% 8% 20% 33% 12%	2280
	11th to 20th	Day	28% 6% 11% 24% 25% 5%	2193
	21st to end	Day	26% 4 10% 27% 25% 7%	2053
October	1st to 10th	Day	25% 4 7% 17% 32% 14%	3170
	11th to 20th	Day	27% 4 12% 30% 23% 5%	3150
	21st to end	Day	33% 5% 13% 32% 15% 2	3438
November	1st to 10th	Day	38% 6% 14% 23% 16% 4	1591
	11th to 20th	Day	33% 7% 18% 25% 15% 2	1528
	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	34% 8% 18% 27% 12% 1	4628
	11th to 20th	Night	46% 8% 16% 18% 11% 2	4384
	21st to end	Night	32% 10% 20% 28% 10% 1	4521
February	1st to 10th	Night	47% 7% 15% 22% 9% 1	2470
	11th to 20th	Night	47% 7% 14% 19% 12% 1	2403
	21st to end	Night	41% 7% 13% 23% 14% 2	2032
March	1st to 10th	Night	33% 6% 14% 25% 17% 4	3445
	11th to 20th	Night	30% 9% 20% 29% 10% 1	3490
	21st to end	Night	52% 13% 15% 16% 4	3828
April	1st to 10th	Night	41% 7% 17% 21% 11% 3	1912
	11th to 20th	Night	47% 8% 13% 24% 7% 1	1795
	21st to end	Night	45% 9% 13% 23% 10%	1710
May	1st to 10th	Night	49% 7% 10% 22% 10% 3	2742
	11th to 20th	Night	34% 9% 14% 33% 7% 3	2518
	21st to end	Night	41% 9% 16% 28% 6%	2762
June	1st to 10th	Night	36% 11% 19% 23% 9% 2	1505
	11th to 20th	Night	34% 8% 16% 23% 15% 4	1330
	21st to end	Night	22% 7% 16% 27% 20% 7%	1330
July	1st to 10th	Night	24% 5% 11% 31% 24% 5%	2185
	11th to 20th	Night	18% 5% 8% 20% 33% 16%	2398
	21st to end	Night	18% 4 9% 24% 31% 14%	2790
August	1st to 10th	Night	28% 6% 14% 22% 20% 10%	2838
	11th to 20th	Night	26% 5% 9% 30% 21% 8%	2838
	21st to end	Night	20% 4 7% 26% 31% 13%	3260
September	1st to 10th	Night	22% 5% 9% 22% 27% 15%	1900
	11th to 20th	Night	27% 6% 10% 27% 22% 7%	1985
	21st to end	Night	27% 5% 10% 27% 25% 7%	2125
October	1st to 10th	Night	24% 5% 7% 22% 30% 12%	3800
	11th to 20th	Night	31% 4 10% 28% 20% 6%	3778
	21st to end	Night	32% 4 10% 32% 17% 6%	4120
November	1st to 10th	Night	36% 6% 14% 25% 15% 3	2687
	11th to 20th	Night	32% 7% 16% 28% 14% 2	2675
	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% 10% 45% 24% 10%	270
	21st to end	Day	10% 13% 46% 23% 6% 2	297
February	1st to 10th	Day	14% 16% 52% 14% 3	270
	11th to 20th	Day	10% 16% 49% 19% 4 1	270
	21st to end	Day	8% 17% 44% 25% 5%	225
March	1st to 10th	Day	10% 16% 42% 27% 4 1	441
	11th to 20th	Day	9% 16% 40% 29% 6% 1	460
	21st to end	Day	18% 18% 31% 24% 8% 1	506
April	1st to 10th	Day	17% 18% 35% 25% 3	460
	11th to 20th	Day	14% 22% 38% 21% 4 1	452
	21st to end	Day	22% 14% 30% 24% 9% 2	460
May	1st to 10th	Day	20% 13% 24% 26% 15% 2	529
	11th to 20th	Day	20% 6% 26% 26% 17% 4	675
	21st to end	Day	22% 7% 21% 25% 19% 6%	734
June	1st to 10th	Day	13% 5% 26% 31% 20% 6%	680
	11th to 20th	Day	11% 11% 31% 32% 13% 1	680
	21st to end	Day	7% 6% 27% 36% 23% 3	680
July	1st to 10th	Day	5% 5% 24% 38% 25% 3	671
	11th to 20th	Day	3 4 26% 42% 23% 2	668
	21st to end	Day	3 2 22% 42% 26% 5%	666
August	1st to 10th	Day	6% 5% 25% 39% 21% 4	487
	11th to 20th	Day	7% 4 27% 36% 24% 3	477
	21st to end	Day	4 6% 24% 41% 20% 4	539
September	1st to 10th	Day	7% 7% 27% 37% 19% 4	490
	11th to 20th	Day	14% 5% 23% 38% 16% 5%	490
	21st to end	Day	14% 10% 27% 32% 16% 2	453
October	1st to 10th	Day	14% 8% 28% 31% 15% 4	300
	11th to 20th	Day	14% 9% 35% 26% 14% 2	300
	21st to end	Day	14% 16% 39% 20% 9% 2	330
November	1st to 10th	Day	15% 11% 40% 24% 9% 2	300
	11th to 20th	Day	10% 13% 47% 23% 7% 1	273
	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%	917
	21st to end	Night	10% 7% 50% 27% 6%	836
February	1st to 10th	Night	10% 10% 44% 29% 7% 1	760
	11th to 20th	Night	10% 7% 45% 30% 6% 1	744
	21st to end	Night	8% 8% 44% 32% 7% 1	628
March	1st to 10th	Night	7% 6% 43% 34% 9% 1	760
	11th to 20th	Night	11% 4 35% 39% 10% 1	760
	21st to end	Night	16% 8% 28% 37% 11% 1	836
April	1st to 10th	Night	13% 8% 31% 39% 7% 1	582
	11th to 20th	Night	17% 8% 33% 33% 8%	563
	21st to end	Night	19% 7% 23% 37% 14% 1	570
May	1st to 10th	Night	20% 8% 23% 35% 14% 1	570
	11th to 20th	Night	18% 5% 20% 36% 20% 1	561
	21st to end	Night	21% 3 18% 39% 18% 2	617
June	1st to 10th	Night	13% 3 21% 41% 20% 2	555
	11th to 20th	Night	11% 4 23% 46% 15% 1	380
	21st to end	Night	7% 2 18% 51% 21% 1	380
July	1st to 10th	Night	8% 1 9% 49% 32% 1	370
	11th to 20th	Night	4 3 15% 57% 20%	497
	21st to end	Night	4 1 15% 56% 23% 1	624
August	1st to 10th	Night	5% 2 14% 55% 23% 1	567
	11th to 20th	Night	5% 2 15% 55% 22% 2	564
	21st to end	Night	9% 2 15% 51% 21% 2	627
September	1st to 10th	Night	7% 3 19% 47% 22% 2	570
	11th to 20th	Night	11% 1 18% 49% 18% 2	655
	21st to end	Night	16% 4 19% 42% 18% 2	760
October	1st to 10th	Night	20% 4 22% 37% 15% 2	760
	11th to 20th	Night	16% 6% 29% 34% 13% 2	760
	21st to end	Night	11% 7% 35% 35% 10% 2	836
November	1st to 10th	Night	12% 7% 37% 36% 8% 1	942
	11th to 20th	Night	10% 8% 46% 31% 4	956
	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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