Sinnemahoning State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sinnemahoning State Park clear sky chart from 2005-11-06 to 2024-11-04.

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	17% 11% 4 8% 5% 5% 5% 4 5% 7% 30%	101380
	Night	17% 11% 4 9% 5% 4 4 3 5% 6% 31%	97622
Transparency	Day	50% 7% 12% 20% 10% 1	104985
	Night	51% 6% 12% 19% 10% 1	102105
Seeing	Day	26% 16% 26% 18% 10% 4	14709
	Night	24% 15% 24% 26% 11% 1	24115

By Month

Percentage Cloud Cover NE (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% 21% 10% 10% 4 3 3 3 3 4 22%	2517
	11th to 20th	Day	11% 18% 9% 20% 6% 4 3 3 3 5% 18%	2790
	21st to end	Day	23% 18% 9% 11% 6% 3 4 2 3 4 16%	3124
February	1st to 10th	Day	16% 17% 5% 12% 7% 5% 5% 4 4 4 22%	1710
	11th to 20th	Day	14% 14% 6% 12% 6% 4 4 3 5% 6% 25%	1663
	21st to end	Day	20% 13% 4 11% 6% 3 3 2 4 5% 28%	1533
March	1st to 10th	Day	22% 13% 4 8% 5% 4 3 3 5% 7% 28%	3417
	11th to 20th	Day	12% 15% 6% 9% 6% 4 3 3 4 5% 32%	3480
	21st to end	Day	15% 11% 3 9% 6% 5% 5% 4 5% 5% 33%	3836
April	1st to 10th	Day	17% 15% 3 9% 4 4 4 3 4 6% 30%	2280
	11th to 20th	Day	18% 11% 3 8% 5% 4 4 4 5% 5% 33%	2254
	21st to end	Day	21% 9% 3 7% 5% 3 4 3 4 6% 34%	2382
May	1st to 10th	Day	27% 7% 2 7% 4 4 4 4 5% 6% 30%	4108
	11th to 20th	Day	23% 10% 3 8% 5% 4 5% 4 4 7% 26%	4363
	21st to end	Day	13% 7% 2 6% 5% 5% 5% 5% 6% 8% 39%	4837
June	1st to 10th	Day	15% 8% 3 7% 6% 5% 5% 4 6% 8% 34%	2660
	11th to 20th	Day	14% 7% 2 8% 6% 5% 5% 4 6% 9% 34%	2660
	21st to end	Day	13% 7% 2 6% 5% 6% 5% 4 7% 9% 36%	2660
July	1st to 10th	Day	9% 7% 3 7% 6% 5% 6% 5% 7% 10% 35%	4440
	11th to 20th	Day	9% 7% 3 8% 6% 6% 6% 5% 6% 9% 35%	4440
	21st to end	Day	10% 7% 3 6% 5% 6% 6% 5% 7% 8% 35%	4468
August	1st to 10th	Day	20% 8% 3 7% 5% 5% 5% 5% 6% 8% 30%	4104
	11th to 20th	Day	14% 7% 3 8% 6% 7% 6% 5% 8% 8% 28%	4028
	21st to end	Day	15% 7% 2 6% 4 5% 6% 4 7% 10% 35%	4180
September	1st to 10th	Day	18% 7% 3 6% 4 4 4 3 5% 6% 40%	2280
	11th to 20th	Day	14% 7% 2 7% 4 3 4 3 6% 6% 44%	2257
	21st to end	Day	23% 8% 2 6% 4 5% 4 3 4 7% 34%	1995
October	1st to 10th	Day	17% 10% 3 6% 4 4 4 3 6% 8% 34%	1900
	11th to 20th	Day	21% 9% 3 7% 5% 4 4 3 6% 5% 33%	1900
	21st to end	Day	21% 11% 3 7% 4 5% 4 4 5% 6% 30%	2090
November	1st to 10th	Day	13% 8% 3 7% 5% 5% 4 3 6% 6% 39%	1765
	11th to 20th	Day	17% 16% 4 9% 5% 3 4 4 6% 6% 27%	1541
	21st to end	Day	19% 18% 4 8% 5% 4 4 3 5% 6% 24%	1520
December	1st to 10th	Day	19% 21% 6% 10% 6% 5% 5% 2 4 4 17%	1520
	11th to 20th	Day	20% 17% 6% 10% 4 4 4 3 6% 6% 20%	1906
	21st to end	Day	25% 20% 7% 10% 6% 4 3 2 4 5% 15%	2772
January	1st to 10th	Night	16% 19% 7% 11% 5% 5% 4 4 4 6% 20%	4429
	11th to 20th	Night	15% 17% 7% 16% 6% 5% 4 3 5% 5% 17%	4152
	21st to end	Night	25% 17% 5% 14% 5% 5% 4 3 3 3 16%	4532
February	1st to 10th	Night	15% 15% 5% 11% 6% 5% 5% 3 5% 5% 25%	2470
	11th to 20th	Night	16% 13% 5% 11% 6% 5% 4 4 6% 7% 24%	2403
	21st to end	Night	18% 13% 4 11% 6% 4 4 4 3 6% 27%	1919
March	1st to 10th	Night	22% 14% 3 8% 5% 4 3 3 4 5% 28%	3422
	11th to 20th	Night	14% 16% 7% 9% 4 4 3 3 6% 6% 27%	3479
	21st to end	Night	17% 10% 3 8% 4 4 3 2 4 6% 39%	3794
April	1st to 10th	Night	19% 14% 3 8% 6% 4 4 3 4 6% 30%	1900
	11th to 20th	Night	18% 10% 3 6% 5% 4 4 2 5% 7% 36%	1875
	21st to end	Night	18% 9% 4 8% 4 4 3 4 5% 6% 35%	1815
May	1st to 10th	Night	28% 10% 3 6% 4 4 4 3 3 5% 31%	2833
	11th to 20th	Night	24% 11% 3 7% 4 4 4 3 5% 5% 29%	2527
	21st to end	Night	13% 7% 3 7% 5% 5% 4 4 6% 8% 36%	2738
June	1st to 10th	Night	13% 7% 2 6% 5% 4 4 3 7% 7% 41%	1520
	11th to 20th	Night	11% 7% 3 6% 5% 4 5% 5% 6% 9% 40%	1520
	21st to end	Night	13% 5% 3 6% 4 5% 5% 4 6% 11% 39%	1520
July	1st to 10th	Night	12% 6% 4 7% 5% 5% 5% 4 6% 7% 39%	2520
	11th to 20th	Night	8% 6% 3 6% 5% 4 5% 4 7% 9% 42%	2520
	21st to end	Night	12% 6% 3 7% 5% 4 5% 3 6% 7% 41%	3080
August	1st to 10th	Night	19% 6% 2 7% 4 5% 4 4 5% 7% 36%	2825
	11th to 20th	Night	18% 7% 2 6% 4 4 4 4 5% 6% 39%	2785
	21st to end	Night	14% 5% 2 5% 4 4 4 4 6% 7% 44%	3459
September	1st to 10th	Night	16% 6% 2 5% 4 5% 4 2 4 6% 45%	1900
	11th to 20th	Night	13% 6% 2 6% 3 4 3 3 4 7% 50%	1919
	21st to end	Night	21% 7% 3 7% 4 4 4 3 4 6% 36%	2185
October	1st to 10th	Night	18% 7% 2 7% 4 3 3 3 5% 7% 40%	2280
	11th to 20th	Night	19% 9% 2 6% 4 4 4 3 5% 7% 36%	2280
	21st to end	Night	23% 11% 3 7% 3 4 3 3 5% 7% 32%	2508
November	1st to 10th	Night	12% 9% 2 6% 5% 4 4 3 5% 6% 43%	2385
	11th to 20th	Night	17% 13% 4 8% 6% 5% 4 4 5% 7% 28%	2636
	21st to end	Night	17% 14% 5% 10% 5% 4 4 4 6% 6% 25%	2660
December	1st to 10th	Night	20% 17% 7% 10% 6% 5% 4 4 6% 5% 18%	2660
	11th to 20th	Night	18% 15% 5% 12% 5% 5% 5% 3 4 5% 23%	3288
	21st to end	Night	24% 16% 6% 10% 5% 4 4 3 5% 6% 16%	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	65% 4 12% 13% 4 2	2518
	11th to 20th	Day	70% 4 8% 12% 5%	2790
	21st to end	Day	73% 5% 7% 11% 4 1	3124
February	1st to 10th	Day	65% 5% 10% 13% 6%	1710
	11th to 20th	Day	59% 4 10% 19% 8%	1672
	21st to end	Day	59% 4 9% 19% 7% 2	1533
March	1st to 10th	Day	55% 4 11% 23% 6% 1	3420
	11th to 20th	Day	53% 5% 15% 18% 8% 2	3480
	21st to end	Day	50% 7% 10% 19% 12% 2	3836
April	1st to 10th	Day	54% 5% 10% 19% 11% 2	2280
	11th to 20th	Day	50% 7% 10% 17% 14% 2	2254
	21st to end	Day	51% 6% 8% 20% 13% 2	2382
May	1st to 10th	Day	54% 6% 9% 22% 8% 1	4120
	11th to 20th	Day	55% 8% 11% 18% 6% 1	4367
	21st to end	Day	40% 9% 12% 24% 13% 2	4837
June	1st to 10th	Day	47% 9% 11% 20% 12% 1	2660
	11th to 20th	Day	46% 8% 14% 19% 12% 1	2660
	21st to end	Day	42% 8% 14% 24% 11%	2660
July	1st to 10th	Day	41% 9% 15% 24% 11% 1	4370
	11th to 20th	Day	41% 9% 14% 23% 13%	4365
	21st to end	Day	41% 9% 13% 25% 12% 1	4325
August	1st to 10th	Day	50% 9% 13% 20% 9%	4091
	11th to 20th	Day	47% 9% 14% 23% 7%	4067
	21st to end	Day	40% 8% 14% 27% 11% 1	4180
September	1st to 10th	Day	44% 5% 10% 24% 15% 2	2280
	11th to 20th	Day	39% 7% 11% 25% 18% 1	2257
	21st to end	Day	50% 5% 12% 19% 14% 1	1995
October	1st to 10th	Day	42% 7% 12% 21% 16% 3	3160
	11th to 20th	Day	43% 6% 11% 22% 16% 2	3140
	21st to end	Day	37% 6% 16% 27% 13% 1	3428
November	1st to 10th	Day	44% 6% 12% 20% 14% 3	1765
	11th to 20th	Day	56% 6% 11% 18% 6% 2	1541
	21st to end	Day	60% 5% 11% 17% 6% 1	1520
December	1st to 10th	Day	70% 5% 10% 11% 4	1520
	11th to 20th	Day	64% 6% 12% 14% 5%	1906
	21st to end	Day	72% 5% 10% 11% 2	2772
January	1st to 10th	Night	63% 7% 10% 15% 5%	4429
	11th to 20th	Night	67% 7% 11% 11% 3 1	4152
	21st to end	Night	72% 4 7% 12% 4 1	4532
February	1st to 10th	Night	59% 5% 12% 16% 7%	2470
	11th to 20th	Night	57% 5% 12% 17% 8%	2405
	21st to end	Night	59% 4 10% 16% 10% 1	1919
March	1st to 10th	Night	58% 5% 10% 20% 6% 1	3432
	11th to 20th	Night	54% 7% 14% 17% 7% 1	3480
	21st to end	Night	45% 4 9% 22% 17% 2	3794
April	1st to 10th	Night	55% 6% 8% 18% 13% 1	1900
	11th to 20th	Night	48% 6% 12% 19% 13% 3	1875
	21st to end	Night	47% 6% 10% 21% 13% 2	1815
May	1st to 10th	Night	57% 5% 9% 19% 8% 2	2840
	11th to 20th	Night	53% 9% 12% 16% 9% 1	2528
	21st to end	Night	41% 9% 14% 18% 13% 5%	2739
June	1st to 10th	Night	40% 8% 13% 24% 14% 1	1520
	11th to 20th	Night	38% 9% 14% 24% 13% 2	1520
	21st to end	Night	39% 8% 13% 27% 13%	1520
July	1st to 10th	Night	41% 8% 13% 21% 16% 2	2480
	11th to 20th	Night	34% 9% 17% 23% 16% 1	2472
	21st to end	Night	40% 8% 13% 21% 18% 1	2982
August	1st to 10th	Night	45% 9% 14% 23% 9%	2814
	11th to 20th	Night	43% 7% 12% 27% 10%	2812
	21st to end	Night	36% 8% 12% 32% 10% 2	3459
September	1st to 10th	Night	40% 6% 9% 25% 16% 3	1900
	11th to 20th	Night	34% 5% 13% 27% 19% 2	1919
	21st to end	Night	47% 6% 12% 20% 14% 1	2185
October	1st to 10th	Night	42% 6% 11% 21% 19% 1	3800
	11th to 20th	Night	38% 6% 13% 22% 17% 5%	3779
	21st to end	Night	38% 4 17% 24% 15% 1	4120
November	1st to 10th	Night	40% 6% 13% 23% 15% 2	2385
	11th to 20th	Night	55% 4 12% 17% 9% 2	2636
	21st to end	Night	56% 6% 14% 18% 6% 1	2660
December	1st to 10th	Night	64% 8% 11% 13% 4	2660
	11th to 20th	Night	62% 6% 11% 17% 4	3288
	21st to end	Night	68% 7% 12% 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	34% 24% 30% 7% 6%	180
	11th to 20th	Day	40% 24% 25% 8% 2	258
	21st to end	Day	34% 25% 29% 9% 2	297
February	1st to 10th	Day	34% 29% 27% 9% 1	270
	11th to 20th	Day	42% 25% 27% 4 1	270
	21st to end	Day	43% 21% 25% 10% 2	345
March	1st to 10th	Day	33% 22% 28% 13% 4	460
	11th to 20th	Day	32% 24% 27% 13% 3 1	460
	21st to end	Day	34% 23% 25% 13% 4 2	506
April	1st to 10th	Day	32% 24% 24% 14% 4 2	460
	11th to 20th	Day	31% 22% 23% 15% 6% 4	452
	21st to end	Day	30% 18% 29% 13% 8% 2	460
May	1st to 10th	Day	32% 17% 25% 14% 9% 3	463
	11th to 20th	Day	26% 16% 28% 18% 8% 4	487
	21st to end	Day	20% 11% 27% 22% 15% 5%	529
June	1st to 10th	Day	19% 18% 27% 23% 12% 2	490
	11th to 20th	Day	18% 14% 27% 25% 13% 4	490
	21st to end	Day	18% 14% 31% 25% 10% 2	490
July	1st to 10th	Day	14% 10% 26% 25% 17% 8%	485
	11th to 20th	Day	11% 10% 29% 25% 19% 7%	484
	21st to end	Day	14% 10% 28% 27% 16% 5%	532
August	1st to 10th	Day	13% 8% 24% 27% 20% 7%	486
	11th to 20th	Day	15% 10% 24% 25% 15% 10%	479
	21st to end	Day	16% 9% 27% 22% 16% 10%	539
September	1st to 10th	Day	21% 13% 19% 23% 16% 9%	490
	11th to 20th	Day	15% 6% 24% 22% 22% 10%	490
	21st to end	Day	29% 12% 22% 18% 14% 5%	490
October	1st to 10th	Day	23% 13% 22% 19% 17% 5%	490
	11th to 20th	Day	28% 16% 27% 18% 8% 3	490
	21st to end	Day	30% 19% 26% 18% 7% 1	539
November	1st to 10th	Day	24% 17% 23% 20% 13% 2	409
	11th to 20th	Day	34% 25% 24% 12% 5%	201
	21st to end	Day	35% 21% 35% 6% 3	180
December	1st to 10th	Day	38% 27% 23% 8% 4 1	180
	11th to 20th	Day	43% 16% 26% 13% 2	180
	21st to end	Day	42% 18% 28% 8% 3	198
January	1st to 10th	Night	31% 24% 28% 14% 3	760
	11th to 20th	Night	30% 22% 27% 18% 3	760
	21st to end	Night	28% 24% 28% 18% 2	836
February	1st to 10th	Night	30% 20% 29% 19% 2	760
	11th to 20th	Night	31% 24% 30% 13% 1	743
	21st to end	Night	32% 21% 27% 18% 2	628
March	1st to 10th	Night	27% 22% 29% 20% 2	760
	11th to 20th	Night	31% 20% 24% 20% 5% 1	760
	21st to end	Night	23% 22% 30% 19% 5% 1	836
April	1st to 10th	Night	29% 18% 27% 22% 4	760
	11th to 20th	Night	26% 15% 27% 23% 8% 1	751
	21st to end	Night	24% 15% 24% 30% 7%	675
May	1st to 10th	Night	24% 10% 21% 30% 14% 1	570
	11th to 20th	Night	19% 11% 25% 37% 8% 1	393
	21st to end	Night	13% 9% 22% 32% 22% 1	411
June	1st to 10th	Night	15% 6% 23% 39% 16% 1	380
	11th to 20th	Night	13% 9% 18% 43% 15% 1	380
	21st to end	Night	13% 4 25% 42% 16%	380
July	1st to 10th	Night	14% 6% 16% 36% 24% 4	370
	11th to 20th	Night	8% 3 17% 42% 28% 1	368
	21st to end	Night	11% 4 18% 41% 24% 2	617
August	1st to 10th	Night	12% 3 16% 40% 27% 2	567
	11th to 20th	Night	16% 5% 11% 36% 28% 4	564
	21st to end	Night	13% 5% 19% 31% 29% 3	819
September	1st to 10th	Night	18% 6% 18% 32% 23% 3	760
	11th to 20th	Night	16% 6% 18% 27% 29% 6%	760
	21st to end	Night	23% 11% 18% 26% 18% 4	760
October	1st to 10th	Night	22% 9% 19% 26% 20% 3	760
	11th to 20th	Night	24% 14% 25% 26% 11% 1	760
	21st to end	Night	28% 14% 23% 28% 6%	836
November	1st to 10th	Night	20% 14% 25% 30% 10%	755
	11th to 20th	Night	27% 18% 26% 21% 7% 1	760
	21st to end	Night	27% 17% 28% 22% 5% 1	760
December	1st to 10th	Night	32% 21% 27% 14% 5%	760
	11th to 20th	Night	28% 20% 28% 20% 3	760
	21st to end	Night	30% 21% 27% 21% 2	836

Page generated at 2024-11-01 22:47:31. Version ac07

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