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 2024-11-01.

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	16% 12% 4 9% 5% 4 4 4 5% 6% 29%	101339
	Night	16% 14% 5% 10% 5% 4 4 3 5% 6% 28%	97607
Transparency	Day	54% 5% 11% 19% 9% 1	101107
	Night	56% 5% 11% 18% 9% 1	97458
Seeing	Day	26% 17% 28% 17% 8% 3	14637
	Night	25% 17% 27% 21% 9% 1	24069

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% 23% 13% 15% 5% 4 3 2 3 4 15%	2517
	11th to 20th	Day	10% 21% 9% 21% 8% 4 3 2 3 4 16%	2837
	21st to end	Day	22% 18% 9% 16% 8% 4 3 2 3 3 11%	3124
February	1st to 10th	Day	14% 21% 7% 14% 9% 5% 4 2 4 3 18%	1710
	11th to 20th	Day	13% 16% 8% 16% 7% 4 5% 3 5% 5% 20%	1663
	21st to end	Day	17% 18% 3 13% 6% 4 4 3 4 4 25%	1512
March	1st to 10th	Day	19% 12% 8% 9% 4 4 3 3 4 6% 28%	3432
	11th to 20th	Day	10% 19% 8% 11% 5% 3 4 3 3 5% 29%	3480
	21st to end	Day	17% 13% 4 11% 5% 4 5% 3 5% 5% 29%	3815
April	1st to 10th	Day	16% 17% 4 8% 4 4 4 3 5% 6% 28%	2267
	11th to 20th	Day	17% 15% 3 7% 4 4 4 4 4 5% 32%	2254
	21st to end	Day	21% 11% 3 7% 5% 4 3 3 4 5% 33%	2432
May	1st to 10th	Day	26% 9% 3 7% 5% 4 4 3 4 5% 29%	4108
	11th to 20th	Day	20% 11% 3 9% 6% 5% 5% 4 5% 7% 25%	4324
	21st to end	Day	13% 7% 2 6% 5% 5% 4 4 5% 7% 41%	4837
June	1st to 10th	Day	17% 9% 3 7% 6% 5% 5% 3 6% 8% 32%	2660
	11th to 20th	Day	15% 7% 3 7% 6% 6% 5% 4 8% 8% 32%	2660
	21st to end	Day	16% 6% 3 7% 5% 4 4 5% 7% 8% 35%	2660
July	1st to 10th	Day	10% 6% 2 7% 5% 6% 6% 5% 7% 10% 35%	4440
	11th to 20th	Day	11% 7% 3 7% 5% 5% 6% 5% 8% 9% 35%	4390
	21st to end	Day	11% 7% 3 7% 6% 5% 6% 5% 6% 8% 36%	4466
August	1st to 10th	Day	19% 8% 3 8% 5% 5% 5% 4 6% 9% 28%	4104
	11th to 20th	Day	15% 7% 2 8% 6% 6% 7% 5% 8% 9% 27%	4044
	21st to end	Day	14% 7% 2 6% 5% 4 5% 4 7% 9% 36%	4226
September	1st to 10th	Day	19% 7% 2 6% 4 4 5% 3 5% 5% 40%	2280
	11th to 20th	Day	15% 6% 3 7% 4 5% 4 4 4 7% 40%	2218
	21st to end	Day	23% 8% 3 7% 5% 3 5% 3 5% 6% 31%	2019
October	1st to 10th	Day	19% 8% 3 7% 4 4 5% 4 6% 6% 33%	1900
	11th to 20th	Day	21% 11% 4 8% 5% 3 4 3 4 5% 31%	1900
	21st to end	Day	22% 14% 3 8% 5% 5% 5% 4 4 5% 25%	2090
November	1st to 10th	Day	14% 14% 4 7% 5% 3 4 4 6% 6% 33%	1732
	11th to 20th	Day	16% 19% 6% 9% 5% 3 3 3 5% 6% 24%	1520
	21st to end	Day	18% 22% 7% 9% 6% 3 4 3 4 5% 20%	1520
December	1st to 10th	Day	16% 26% 8% 14% 6% 4 3 2 4 4 12%	1520
	11th to 20th	Day	15% 20% 8% 16% 7% 4 3 3 5% 4 17%	1906
	21st to end	Day	21% 25% 9% 11% 5% 4 3 3 3 3 12%	2772
January	1st to 10th	Night	15% 20% 11% 18% 5% 4 4 3 4 4 13%	4429
	11th to 20th	Night	12% 19% 11% 20% 7% 6% 5% 3 4 4 11%	4120
	21st to end	Night	21% 20% 8% 16% 9% 5% 3 2 3 3 11%	4532
February	1st to 10th	Night	14% 19% 5% 13% 9% 6% 4 3 4 3 18%	2470
	11th to 20th	Night	12% 14% 6% 16% 9% 6% 6% 3 5% 5% 17%	2403
	21st to end	Night	18% 14% 5% 15% 8% 4 4 3 4 4 22%	1935
March	1st to 10th	Night	18% 17% 5% 12% 5% 4 3 2 3 4 27%	3408
	11th to 20th	Night	14% 15% 9% 12% 5% 3 3 2 5% 6% 25%	3479
	21st to end	Night	13% 13% 4 11% 5% 4 3 3 4 6% 34%	3817
April	1st to 10th	Night	17% 15% 4 9% 5% 4 4 3 5% 6% 28%	1911
	11th to 20th	Night	18% 14% 3 6% 4 4 3 3 6% 5% 35%	1875
	21st to end	Night	15% 11% 4 8% 5% 4 4 3 5% 7% 34%	1762
May	1st to 10th	Night	26% 11% 3 6% 4 4 4 3 4 6% 30%	2833
	11th to 20th	Night	21% 12% 3 6% 5% 3 5% 3 4 6% 32%	2566
	21st to end	Night	14% 8% 2 6% 4 4 4 3 7% 8% 40%	2738
June	1st to 10th	Night	13% 7% 3 6% 5% 5% 4 4 7% 9% 37%	1520
	11th to 20th	Night	11% 7% 3 6% 5% 5% 4 4 6% 9% 39%	1520
	21st to end	Night	15% 8% 2 6% 3 5% 4 3 6% 7% 42%	1520
July	1st to 10th	Night	12% 9% 2 9% 4 4 4 4 5% 7% 39%	2520
	11th to 20th	Night	10% 7% 2 6% 5% 4 5% 5% 6% 9% 42%	2567
	21st to end	Night	13% 6% 2 6% 4 4 5% 4 6% 8% 41%	3087
August	1st to 10th	Night	17% 8% 2 7% 5% 4 5% 4 6% 8% 35%	2825
	11th to 20th	Night	17% 9% 3 6% 4 5% 5% 3 5% 6% 38%	2785
	21st to end	Night	11% 7% 2 6% 4 4 5% 4 5% 9% 44%	3398
September	1st to 10th	Night	14% 7% 3 7% 4 4 4 3 5% 7% 43%	1900
	11th to 20th	Night	13% 7% 2 5% 3 4 4 3 6% 6% 47%	1959
	21st to end	Night	20% 8% 2 7% 4 4 4 4 5% 6% 34%	2161
October	1st to 10th	Night	17% 8% 3 7% 4 4 4 3 4 6% 40%	2280
	11th to 20th	Night	19% 11% 3 6% 5% 4 4 3 5% 6% 33%	2280
	21st to end	Night	23% 14% 4 7% 4 3 4 3 5% 5% 28%	2508
November	1st to 10th	Night	12% 15% 3 8% 4 4 3 3 5% 6% 38%	2347
	11th to 20th	Night	16% 18% 5% 10% 5% 5% 4 4 5% 5% 25%	2660
	21st to end	Night	15% 20% 6% 11% 6% 4 4 4 4 5% 21%	2660
December	1st to 10th	Night	17% 22% 8% 14% 7% 4 5% 3 4 4 13%	2660
	11th to 20th	Night	17% 18% 7% 17% 7% 4 3 3 4 4 17%	3288
	21st to end	Night	20% 21% 10% 12% 6% 5% 3 3 4 4 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	57% 5% 9% 23% 6%	3435
	11th to 20th	Day	58% 4 13% 17% 6% 1	3480
	21st to end	Day	56% 5% 8% 20% 10% 2	3815
April	1st to 10th	Day	57% 4 10% 17% 12% 1	2267
	11th to 20th	Day	53% 6% 10% 18% 12% 1	2254
	21st to end	Day	53% 4 9% 18% 12% 2	2432
May	1st to 10th	Day	56% 5% 9% 21% 8% 1	4120
	11th to 20th	Day	56% 7% 12% 19% 6% 1	4328
	21st to end	Day	41% 6% 13% 24% 14% 1	4837
June	1st to 10th	Day	48% 6% 12% 20% 12% 1	2660
	11th to 20th	Day	47% 7% 14% 20% 11% 1	2660
	21st to end	Day	44% 7% 13% 24% 11%	2660
July	1st to 10th	Day	42% 7% 13% 24% 12% 2	4370
	11th to 20th	Day	41% 8% 13% 23% 14%	4315
	21st to end	Day	43% 7% 13% 25% 11% 1	4324
August	1st to 10th	Day	51% 7% 13% 21% 8%	4091
	11th to 20th	Day	48% 8% 16% 23% 5%	4083
	21st to end	Day	41% 6% 12% 29% 10% 1	4226
September	1st to 10th	Day	46% 5% 10% 22% 16% 1	2280
	11th to 20th	Day	43% 5% 11% 24% 16% 2	2218
	21st to end	Day	53% 5% 10% 19% 12%	2019
October	1st to 10th	Day	49% 6% 11% 18% 14% 1	1900
	11th to 20th	Day	54% 5% 13% 19% 9% 1	1900
	21st to end	Day	60% 4 10% 15% 8% 2	2090
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% 9% 20% 5%	3418
	11th to 20th	Night	59% 5% 14% 16% 6% 1	3480
	21st to end	Night	49% 5% 9% 21% 15% 2	3817
April	1st to 10th	Night	57% 5% 10% 17% 11% 1	1911
	11th to 20th	Night	51% 5% 11% 19% 11% 3	1875
	21st to end	Night	49% 5% 12% 20% 12% 2	1762
May	1st to 10th	Night	55% 5% 11% 19% 8% 2	2840
	11th to 20th	Night	53% 7% 13% 19% 7% 1	2567
	21st to end	Night	40% 8% 12% 21% 15% 4	2739
June	1st to 10th	Night	43% 6% 12% 24% 13% 1	1520
	11th to 20th	Night	40% 8% 15% 23% 13% 2	1520
	21st to end	Night	40% 6% 13% 27% 14%	1520
July	1st to 10th	Night	45% 5% 11% 21% 17% 1	2480
	11th to 20th	Night	36% 6% 17% 26% 15% 1	2519
	21st to end	Night	40% 7% 12% 24% 17% 1	2988
August	1st to 10th	Night	47% 7% 14% 24% 8% 1	2814
	11th to 20th	Night	45% 6% 15% 27% 8%	2812
	21st to end	Night	36% 6% 14% 33% 10% 1	3398
September	1st to 10th	Night	40% 5% 12% 25% 15% 3	1900
	11th to 20th	Night	37% 5% 12% 26% 18% 2	1959
	21st to end	Night	50% 6% 12% 19% 12% 1	2161
October	1st to 10th	Night	45% 5% 12% 21% 15% 1	2280
	11th to 20th	Night	49% 6% 14% 17% 11% 2	2280
	21st to end	Night	57% 4 12% 17% 9% 1	2508
November	1st to 10th	Night	46% 5% 12% 21% 13% 3	2347
	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	34% 24% 29% 10% 3	460
	11th to 20th	Day	31% 26% 30% 9% 3 1	460
	21st to end	Day	36% 23% 26% 11% 3 1	506
April	1st to 10th	Day	33% 22% 27% 14% 4	460
	11th to 20th	Day	32% 23% 25% 12% 6% 2	452
	21st to end	Day	30% 17% 35% 12% 5% 1	460
May	1st to 10th	Day	30% 19% 27% 15% 6% 2	463
	11th to 20th	Day	27% 15% 31% 16% 7% 3	487
	21st to end	Day	18% 14% 30% 22% 12% 5%	529
June	1st to 10th	Day	22% 17% 30% 21% 8% 2	490
	11th to 20th	Day	19% 14% 28% 25% 11% 2	490
	21st to end	Day	17% 15% 38% 20% 8% 2	490
July	1st to 10th	Day	13% 8% 30% 26% 16% 6%	485
	11th to 20th	Day	16% 10% 28% 25% 16% 6%	484
	21st to end	Day	14% 10% 33% 28% 10% 5%	532
August	1st to 10th	Day	16% 6% 28% 28% 14% 8%	486
	11th to 20th	Day	17% 9% 27% 27% 13% 7%	479
	21st to end	Day	14% 12% 29% 25% 14% 7%	539
September	1st to 10th	Day	23% 11% 23% 21% 15% 7%	490
	11th to 20th	Day	16% 7% 25% 24% 19% 9%	490
	21st to end	Day	30% 11% 25% 18% 11% 4	490
October	1st to 10th	Day	21% 14% 30% 17% 15% 3	490
	11th to 20th	Day	27% 21% 29% 14% 7% 1	490
	21st to end	Day	33% 19% 29% 16% 4	539
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	26% 27% 31% 15% 2	760
	11th to 20th	Night	31% 24% 24% 17% 4 1	760
	21st to end	Night	25% 21% 34% 14% 4 1	836
April	1st to 10th	Night	27% 21% 31% 18% 3	760
	11th to 20th	Night	29% 17% 29% 18% 7% 1	751
	21st to end	Night	23% 14% 33% 26% 5%	622
May	1st to 10th	Night	25% 10% 26% 28% 10% 1	570
	11th to 20th	Night	20% 11% 29% 33% 6%	419
	21st to end	Night	15% 8% 25% 32% 18% 2	411
June	1st to 10th	Night	14% 9% 31% 33% 12%	380
	11th to 20th	Night	13% 11% 25% 40% 12% 1	380
	21st to end	Night	16% 7% 31% 33% 13% 1	380
July	1st to 10th	Night	15% 4 26% 35% 19% 2	370
	11th to 20th	Night	10% 4 23% 39% 23% 1	389
	21st to end	Night	14% 5% 21% 39% 21% 1	624
August	1st to 10th	Night	13% 3 22% 35% 25% 2	567
	11th to 20th	Night	17% 5% 17% 33% 24% 3	564
	21st to end	Night	14% 5% 22% 33% 22% 4	784
September	1st to 10th	Night	18% 8% 23% 28% 19% 3	760
	11th to 20th	Night	16% 6% 20% 28% 26% 4	760
	21st to end	Night	23% 11% 22% 24% 16% 4	760
October	1st to 10th	Night	22% 11% 26% 23% 16% 2	760
	11th to 20th	Night	27% 16% 29% 20% 7% 1	760
	21st to end	Night	32% 14% 33% 17% 4	836
November	1st to 10th	Night	21% 17% 32% 22% 7% 1	743
	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 2024-10-29 11:20:44. Version ac07

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