Kinzua Bridge State Park Visitor's Center
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kinzua Bridge State Park Visitor's Center clear sky chart from 2005-11-06 to 2024-03-06.

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% 12% 5% 9% 7% 3 5% 4 5% 6% 28%	78523
	Night	16% 13% 6% 10% 7% 3 4 4 5% 6% 27%	80981
Transparency	Day	56% 5% 11% 17% 9% 1	78240
	Night	58% 5% 11% 17% 9% 1	80798
Seeing	Day	26% 17% 29% 17% 8% 3	13677
	Night	25% 17% 27% 21% 9% 1	23298

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	14% 22% 13% 14% 6% 3 3 3 3 4 15%	2517
	11th to 20th	Day	10% 20% 10% 19% 10% 3 3 3 3 4 16%	2837
	21st to end	Day	22% 17% 9% 14% 10% 3 4 3 3 3 11%	3124
February	1st to 10th	Day	14% 19% 8% 12% 10% 4 5% 3 4 3 18%	1710
	11th to 20th	Day	13% 14% 9% 14% 9% 3 5% 4 4 5% 20%	1663
	21st to end	Day	17% 16% 4 12% 8% 3 4 4 4 4 25%	1512
March	1st to 10th	Day	15% 13% 8% 11% 6% 3 4 4 4 5% 27%	2032
	11th to 20th	Day	15% 16% 8% 10% 6% 3 4 4 4 5% 27%	1980
	21st to end	Day	20% 13% 5% 8% 7% 3 4 4 4 4 29%	2178
April	1st to 10th	Day	16% 14% 6% 7% 5% 3 5% 4 5% 7% 29%	2147
	11th to 20th	Day	18% 14% 4 6% 5% 2 5% 5% 4 5% 32%	2134
	21st to end	Day	22% 11% 4 6% 6% 3 4 3 4 5% 33%	2304
May	1st to 10th	Day	21% 11% 4 7% 7% 4 4 5% 5% 6% 28%	2340
	11th to 20th	Day	21% 9% 4 6% 7% 4 4 5% 4 7% 29%	2432
	21st to end	Day	15% 6% 2 6% 5% 3 5% 6% 5% 8% 38%	2725
June	1st to 10th	Day	17% 8% 3 6% 7% 3 5% 4 6% 8% 33%	2520
	11th to 20th	Day	16% 7% 3 6% 6% 4 5% 5% 7% 9% 32%	2520
	21st to end	Day	16% 6% 3 6% 5% 3 5% 5% 6% 8% 36%	2520
July	1st to 10th	Day	11% 6% 3 6% 6% 4 6% 5% 6% 9% 37%	2520
	11th to 20th	Day	13% 7% 3 6% 7% 3 6% 6% 7% 8% 35%	2498
	21st to end	Day	15% 7% 3 6% 6% 4 6% 6% 6% 8% 34%	2547
August	1st to 10th	Day	11% 6% 3 7% 7% 4 6% 6% 7% 9% 33%	2327
	11th to 20th	Day	14% 7% 3 7% 7% 4 6% 6% 7% 8% 29%	2303
	21st to end	Day	15% 8% 3 7% 6% 4 5% 5% 6% 8% 32%	2408
September	1st to 10th	Day	20% 7% 3 6% 4 3 5% 4 5% 6% 38%	2160
	11th to 20th	Day	16% 6% 3 6% 5% 4 5% 5% 4 7% 39%	2102
	21st to end	Day	21% 7% 3 6% 6% 3 5% 4 5% 7% 32%	1913
October	1st to 10th	Day	19% 8% 3 6% 6% 4 4 6% 6% 6% 33%	1800
	11th to 20th	Day	22% 11% 4 7% 6% 2 4 4 5% 5% 30%	1800
	21st to end	Day	24% 14% 4 7% 6% 4 5% 5% 4 5% 24%	1980
November	1st to 10th	Day	14% 13% 4 7% 6% 3 4 5% 5% 6% 33%	1732
	11th to 20th	Day	16% 18% 7% 8% 6% 3 3 4 5% 6% 24%	1520
	21st to end	Day	19% 20% 7% 9% 6% 3 3 4 4 4 20%	1520
December	1st to 10th	Day	16% 23% 10% 13% 7% 3 4 3 4 4 12%	1520
	11th to 20th	Day	15% 19% 8% 15% 7% 3 4 3 5% 4 17%	1906
	21st to end	Day	22% 23% 10% 10% 6% 3 3 4 3 3 12%	2772
January	1st to 10th	Night	15% 19% 11% 16% 7% 3 5% 4 4 4 13%	4429
	11th to 20th	Night	12% 18% 11% 18% 8% 4 5% 4 4 4 11%	4120
	21st to end	Night	22% 18% 8% 13% 11% 4 4 2 2 3 11%	4532
February	1st to 10th	Night	15% 17% 7% 11% 10% 5% 5% 4 4 4 18%	2470
	11th to 20th	Night	12% 13% 7% 14% 10% 5% 6% 5% 4 6% 18%	2403
	21st to end	Night	18% 12% 6% 12% 10% 3 4 4 4 4 22%	1935
March	1st to 10th	Night	12% 12% 7% 14% 8% 4 4 4 4 5% 25%	2032
	11th to 20th	Night	17% 12% 7% 11% 7% 2 4 3 4 5% 29%	1979
	21st to end	Night	14% 15% 6% 8% 7% 3 4 4 4 6% 29%	2178
April	1st to 10th	Night	17% 13% 5% 8% 6% 3 5% 4 5% 6% 28%	1811
	11th to 20th	Night	18% 13% 3 6% 5% 3 3 3 6% 5% 35%	1775
	21st to end	Night	16% 11% 4 6% 6% 3 5% 4 4 8% 33%	1670
May	1st to 10th	Night	20% 9% 3 6% 6% 3 5% 4 5% 6% 33%	1620
	11th to 20th	Night	16% 9% 4 5% 6% 3 6% 5% 5% 6% 36%	1458
	21st to end	Night	13% 6% 3 5% 5% 3 4 5% 7% 7% 43%	1550
June	1st to 10th	Night	14% 6% 3 5% 6% 4 5% 5% 6% 9% 38%	1440
	11th to 20th	Night	11% 7% 3 6% 6% 3 5% 5% 5% 9% 39%	1440
	21st to end	Night	15% 7% 2 5% 4 3 4 4 6% 7% 43%	1440
July	1st to 10th	Night	10% 6% 2 7% 5% 3 4 5% 6% 7% 45%	1440
	11th to 20th	Night	9% 6% 2 5% 6% 2 5% 5% 5% 8% 47%	1459
	21st to end	Night	12% 5% 3 5% 5% 3 7% 5% 7% 9% 40%	1771
August	1st to 10th	Night	9% 6% 2 6% 6% 3 5% 6% 7% 9% 42%	1611
	11th to 20th	Night	13% 7% 3 6% 5% 4 5% 5% 6% 7% 40%	1598
	21st to end	Night	13% 6% 2 5% 5% 3 5% 5% 5% 9% 42%	1930
September	1st to 10th	Night	15% 7% 3 6% 5% 3 4 4 5% 7% 43%	1800
	11th to 20th	Night	14% 6% 3 4 4 3 4 4 5% 6% 47%	1855
	21st to end	Night	17% 8% 3 6% 6% 3 4 5% 5% 6% 36%	2047
October	1st to 10th	Night	17% 8% 3 6% 5% 3 4 4 4 6% 39%	2160
	11th to 20th	Night	20% 10% 3 5% 6% 3 4 4 5% 6% 32%	2160
	21st to end	Night	25% 14% 4 6% 5% 3 4 4 4 5% 27%	2376
November	1st to 10th	Night	12% 14% 4 7% 5% 3 3 4 5% 6% 38%	2340
	11th to 20th	Night	16% 17% 5% 9% 6% 4 4 4 5% 5% 25%	2660
	21st to end	Night	16% 19% 7% 10% 7% 3 4 5% 4 5% 21%	2660
December	1st to 10th	Night	17% 20% 10% 13% 7% 3 5% 4 4 4 13%	2660
	11th to 20th	Night	17% 17% 8% 15% 8% 3 3 4 3 4 17%	3288
	21st to end	Night	21% 20% 11% 11% 7% 4 4 4 4 5% 11%	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	74% 3 6% 12% 4	2518
	11th to 20th	Day	74% 3 7% 12% 4	2837
	21st to end	Day	78% 4 8% 7% 3 1	3124
February	1st to 10th	Day	71% 3 9% 11% 5%	1710
	11th to 20th	Day	66% 4 8% 15% 6%	1672
	21st to end	Day	62% 3 10% 17% 6% 2	1512
March	1st to 10th	Day	59% 4 10% 19% 7%	2035
	11th to 20th	Day	60% 4 8% 17% 8% 3	1980
	21st to end	Day	59% 4 6% 17% 11% 3	2178
April	1st to 10th	Day	55% 4 10% 18% 12% 1	2147
	11th to 20th	Day	53% 6% 10% 17% 13% 1	2134
	21st to end	Day	54% 4 9% 18% 12% 2	2304
May	1st to 10th	Day	57% 5% 10% 16% 9% 2	2340
	11th to 20th	Day	55% 5% 10% 18% 11% 1	2436
	21st to end	Day	44% 6% 16% 21% 11% 1	2725
June	1st to 10th	Day	48% 6% 12% 20% 13% 1	2520
	11th to 20th	Day	47% 7% 14% 20% 11% 1	2520
	21st to end	Day	44% 7% 12% 25% 11%	2520
July	1st to 10th	Day	45% 7% 10% 24% 13% 2	2450
	11th to 20th	Day	43% 8% 15% 21% 13%	2423
	21st to end	Day	45% 7% 13% 21% 12% 1	2405
August	1st to 10th	Day	44% 8% 14% 24% 9%	2314
	11th to 20th	Day	48% 8% 16% 19% 8% 1	2303
	21st to end	Day	47% 8% 11% 22% 12% 2	2408
September	1st to 10th	Day	47% 5% 11% 20% 15% 1	2160
	11th to 20th	Day	44% 5% 11% 23% 15% 2	2102
	21st to end	Day	51% 5% 11% 20% 13%	1913
October	1st to 10th	Day	50% 6% 11% 18% 13% 1	1800
	11th to 20th	Day	55% 4 13% 20% 8%	1800
	21st to end	Day	62% 5% 10% 14% 7% 2	1980
November	1st to 10th	Day	49% 6% 12% 17% 13% 3	1732
	11th to 20th	Day	60% 4 11% 16% 7% 2	1520
	21st to end	Day	67% 4 10% 13% 5% 1	1520
December	1st to 10th	Day	76% 3 9% 8% 4	1520
	11th to 20th	Day	70% 5% 10% 12% 3	1906
	21st to end	Day	77% 5% 8% 9% 1	2772
January	1st to 10th	Night	74% 3 8% 11% 3	4429
	11th to 20th	Night	75% 4 10% 8% 2	4120
	21st to end	Night	80% 3 5% 9% 3	4532
February	1st to 10th	Night	69% 4 10% 12% 6%	2470
	11th to 20th	Night	67% 5% 9% 14% 5% 1	2405
	21st to end	Night	65% 4 9% 13% 8% 1	1935
March	1st to 10th	Night	60% 5% 10% 18% 6% 1	2042
	11th to 20th	Night	58% 4 11% 18% 9% 1	1980
	21st to end	Night	56% 4 9% 15% 13% 2	2178
April	1st to 10th	Night	56% 5% 10% 17% 11% 1	1811
	11th to 20th	Night	51% 5% 11% 19% 12% 3	1775
	21st to end	Night	50% 5% 11% 19% 12% 2	1670
May	1st to 10th	Night	53% 5% 10% 19% 10% 3	1620
	11th to 20th	Night	48% 7% 11% 20% 13% 1	1459
	21st to end	Night	39% 8% 14% 22% 13% 3	1551
June	1st to 10th	Night	42% 6% 12% 25% 13%	1440
	11th to 20th	Night	41% 8% 14% 22% 13% 2	1440
	21st to end	Night	39% 6% 12% 28% 14%	1440
July	1st to 10th	Night	38% 7% 12% 23% 18% 1	1400
	11th to 20th	Night	34% 6% 15% 25% 18% 1	1411
	21st to end	Night	38% 8% 16% 21% 17% 1	1672
August	1st to 10th	Night	36% 8% 16% 29% 11% 1	1600
	11th to 20th	Night	41% 7% 16% 24% 11%	1598
	21st to end	Night	38% 6% 16% 25% 13% 2	1930
September	1st to 10th	Night	41% 5% 13% 25% 14% 3	1800
	11th to 20th	Night	38% 5% 12% 26% 17% 2	1855
	21st to end	Night	47% 6% 13% 20% 13% 1	2047
October	1st to 10th	Night	46% 6% 13% 21% 14% 1	2160
	11th to 20th	Night	50% 6% 14% 17% 11% 1	2160
	21st to end	Night	59% 4 12% 16% 8% 1	2376
November	1st to 10th	Night	46% 5% 12% 21% 13% 3	2340
	11th to 20th	Night	60% 5% 10% 16% 7% 2	2660
	21st to end	Night	64% 4 11% 16% 3 1	2660
December	1st to 10th	Night	75% 4 8% 9% 3	2660
	11th to 20th	Night	71% 4 10% 13% 2	3288
	21st to end	Night	76% 5% 9% 9% 1	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	36% 25% 28% 7% 4 1	180
	11th to 20th	Day	36% 30% 26% 5% 2	269
	21st to end	Day	35% 26% 31% 8% 1	297
February	1st to 10th	Day	36% 31% 27% 6%	270
	11th to 20th	Day	39% 29% 29% 3 1	270
	21st to end	Day	41% 28% 25% 6%	310
March	1st to 10th	Day	33% 25% 29% 10% 3	440
	11th to 20th	Day	31% 25% 31% 9% 3 1	420
	21st to end	Day	36% 23% 25% 12% 4 1	462
April	1st to 10th	Day	31% 23% 28% 15% 4	420
	11th to 20th	Day	30% 22% 25% 13% 7% 3	412
	21st to end	Day	31% 17% 35% 11% 5% 1	420
May	1st to 10th	Day	29% 21% 26% 15% 6% 2	423
	11th to 20th	Day	28% 16% 30% 17% 6% 3	447
	21st to end	Day	18% 14% 30% 20% 13% 5%	485
June	1st to 10th	Day	21% 16% 32% 22% 8% 2	450
	11th to 20th	Day	21% 14% 27% 24% 12% 2	450
	21st to end	Day	16% 14% 38% 21% 9% 2	450
July	1st to 10th	Day	13% 8% 29% 26% 18% 6%	445
	11th to 20th	Day	16% 9% 27% 26% 16% 6%	444
	21st to end	Day	15% 9% 33% 28% 10% 5%	488
August	1st to 10th	Day	14% 6% 28% 29% 15% 8%	446
	11th to 20th	Day	16% 8% 27% 28% 13% 8%	439
	21st to end	Day	15% 12% 29% 25% 13% 7%	495
September	1st to 10th	Day	23% 10% 23% 21% 15% 7%	450
	11th to 20th	Day	17% 7% 26% 23% 18% 8%	450
	21st to end	Day	26% 12% 27% 18% 12% 4	450
October	1st to 10th	Day	21% 13% 30% 17% 15% 4	450
	11th to 20th	Day	28% 22% 29% 14% 6% 1	450
	21st to end	Day	35% 19% 28% 15% 3	495
November	1st to 10th	Day	27% 19% 26% 17% 8% 2	382
	11th to 20th	Day	39% 23% 24% 11% 1 2	180
	21st to end	Day	38% 22% 32% 6% 1	180
December	1st to 10th	Day	38% 32% 21% 6% 2 2	180
	11th to 20th	Day	44% 20% 29% 6% 2	180
	21st to end	Day	38% 26% 31% 3 2	198
January	1st to 10th	Night	29% 28% 32% 8% 3	760
	11th to 20th	Night	31% 26% 26% 15% 2	760
	21st to end	Night	28% 29% 28% 14% 1	836
February	1st to 10th	Night	31% 25% 28% 15% 1	760
	11th to 20th	Night	29% 31% 30% 10% 1	743
	21st to end	Night	32% 27% 29% 11% 1	628
March	1st to 10th	Night	25% 27% 31% 14% 2	743
	11th to 20th	Night	31% 23% 24% 18% 4 1	720
	21st to end	Night	25% 21% 34% 15% 4 1	792
April	1st to 10th	Night	26% 22% 30% 18% 3	720
	11th to 20th	Night	28% 17% 29% 18% 8% 1	711
	21st to end	Night	23% 14% 33% 25% 5%	590
May	1st to 10th	Night	25% 10% 26% 28% 10% 1	540
	11th to 20th	Night	20% 12% 30% 32% 6%	397
	21st to end	Night	15% 8% 26% 30% 18% 2	389
June	1st to 10th	Night	14% 8% 32% 34% 13%	360
	11th to 20th	Night	13% 11% 25% 39% 12% 1	360
	21st to end	Night	14% 7% 32% 33% 13% 1	360
July	1st to 10th	Night	14% 4 25% 35% 20% 2	350
	11th to 20th	Night	10% 4 23% 38% 23% 1	367
	21st to end	Night	14% 5% 21% 38% 21% 2	591
August	1st to 10th	Night	12% 3 22% 36% 25% 2	537
	11th to 20th	Night	17% 5% 16% 34% 24% 4	534
	21st to end	Night	15% 5% 22% 32% 22% 4	742
September	1st to 10th	Night	18% 8% 23% 28% 19% 3	720
	11th to 20th	Night	16% 7% 21% 28% 24% 4	720
	21st to end	Night	20% 12% 23% 24% 17% 4	720
October	1st to 10th	Night	22% 12% 26% 24% 15% 2	720
	11th to 20th	Night	27% 16% 30% 20% 7% 1	720
	21st to end	Night	33% 15% 32% 16% 4	792
November	1st to 10th	Night	21% 17% 32% 22% 7% 1	740
	11th to 20th	Night	29% 19% 30% 14% 5% 2	760
	21st to end	Night	30% 21% 30% 14% 4 1	760
December	1st to 10th	Night	35% 27% 24% 10% 4	760
	11th to 20th	Night	32% 26% 25% 14% 3	760
	21st to end	Night	32% 24% 31% 12% 1	836

Page generated at 2024-03-03 06:28:57. Version ac07

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