Bald Eagle State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bald Eagle State Park clear sky chart from 2005-11-06 to 2024-11-02.

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	15% 9% 3 8% 5% 5% 5% 4 6% 7% 33%	101371
	Night	16% 10% 3 8% 5% 4 4 4 5% 7% 34%	97597
Transparency	Day	49% 6% 12% 21% 11% 1	101138
	Night	48% 6% 12% 21% 11% 1	97449
Seeing	Day	23% 16% 26% 20% 11% 4	14755
	Night	21% 14% 25% 27% 11% 1	24151

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% 17% 6% 11% 5% 4 4 3 3 4 28%	2517
	11th to 20th	Day	11% 17% 10% 15% 7% 6% 3 3 4 5% 19%	2783
	21st to end	Day	20% 18% 7% 12% 6% 5% 4 3 4 4 19%	3124
February	1st to 10th	Day	15% 16% 5% 11% 7% 6% 4 4 4 5% 24%	1710
	11th to 20th	Day	13% 13% 4 12% 6% 4 4 4 6% 6% 28%	1663
	21st to end	Day	18% 12% 4 11% 6% 4 4 3 5% 5% 29%	1559
March	1st to 10th	Day	22% 11% 3 8% 5% 4 4 3 3 5% 30%	3386
	11th to 20th	Day	12% 11% 4 9% 6% 5% 5% 3 4 6% 35%	3480
	21st to end	Day	14% 10% 3 8% 5% 5% 4 3 5% 6% 38%	3865
April	1st to 10th	Day	15% 12% 3 9% 5% 6% 4 3 5% 6% 33%	2280
	11th to 20th	Day	16% 10% 3 7% 5% 4 4 4 6% 6% 35%	2254
	21st to end	Day	19% 8% 3 7% 5% 5% 4 5% 4 6% 34%	2343
May	1st to 10th	Day	27% 7% 2 6% 5% 4 4 3 5% 7% 29%	4108
	11th to 20th	Day	21% 9% 4 8% 6% 5% 4 4 5% 7% 28%	4388
	21st to end	Day	12% 6% 2 7% 4 5% 5% 4 7% 9% 39%	4837
June	1st to 10th	Day	13% 7% 2 7% 5% 6% 6% 5% 6% 7% 35%	2660
	11th to 20th	Day	14% 6% 2 7% 5% 6% 5% 4 6% 8% 36%	2660
	21st to end	Day	11% 6% 2 6% 5% 4 5% 5% 6% 10% 38%	2660
July	1st to 10th	Day	7% 6% 3 8% 6% 5% 6% 5% 7% 10% 37%	4440
	11th to 20th	Day	6% 5% 2 7% 5% 6% 7% 5% 8% 11% 37%	4440
	21st to end	Day	9% 7% 3 8% 5% 5% 5% 5% 8% 8% 36%	4478
August	1st to 10th	Day	18% 8% 3 7% 5% 5% 5% 4 6% 8% 32%	4104
	11th to 20th	Day	12% 7% 3 8% 6% 6% 7% 4 7% 8% 32%	3990
	21st to end	Day	12% 7% 2 5% 4 5% 5% 4 7% 9% 41%	4180
September	1st to 10th	Day	17% 6% 2 6% 4 5% 4 3 5% 6% 43%	2280
	11th to 20th	Day	13% 6% 2 5% 4 3 5% 3 5% 7% 47%	2280
	21st to end	Day	20% 8% 3 6% 4 3 4 4 5% 6% 36%	1983
October	1st to 10th	Day	15% 8% 3 7% 5% 5% 4 3 6% 7% 38%	1900
	11th to 20th	Day	17% 8% 3 8% 5% 5% 5% 3 5% 6% 36%	1900
	21st to end	Day	17% 9% 3 7% 4 5% 5% 4 5% 7% 35%	2090
November	1st to 10th	Day	11% 7% 3 8% 5% 4 5% 3 6% 6% 43%	1734
	11th to 20th	Day	14% 11% 3 9% 6% 4 6% 4 5% 5% 32%	1577
	21st to end	Day	17% 12% 3 8% 5% 4 4 5% 5% 6% 30%	1520
December	1st to 10th	Day	18% 15% 4 11% 6% 6% 4 4 5% 5% 21%	1520
	11th to 20th	Day	19% 15% 5% 9% 4 4 3 4 5% 6% 27%	1906
	21st to end	Day	22% 17% 5% 11% 6% 6% 4 3 5% 5% 16%	2772
January	1st to 10th	Night	13% 14% 5% 11% 6% 4 4 4 5% 6% 26%	4429
	11th to 20th	Night	14% 15% 7% 13% 5% 5% 4 4 5% 6% 22%	4175
	21st to end	Night	22% 15% 5% 12% 5% 5% 4 3 3 4 22%	4532
February	1st to 10th	Night	14% 13% 4 10% 6% 5% 4 4 6% 6% 29%	2470
	11th to 20th	Night	15% 11% 4 10% 5% 5% 5% 4 5% 7% 29%	2403
	21st to end	Night	17% 11% 4 10% 6% 4 4 4 4 5% 31%	1894
March	1st to 10th	Night	23% 12% 3 7% 4 4 4 3 4 5% 31%	3452
	11th to 20th	Night	11% 14% 5% 8% 5% 4 4 3 6% 6% 33%	3479
	21st to end	Night	14% 9% 3 8% 4 4 3 3 4 6% 42%	3766
April	1st to 10th	Night	18% 12% 3 8% 5% 4 4 4 5% 7% 31%	1900
	11th to 20th	Night	16% 8% 2 7% 6% 5% 4 4 5% 8% 37%	1875
	21st to end	Night	17% 8% 2 6% 5% 4 5% 4 6% 6% 38%	1853
May	1st to 10th	Night	27% 8% 3 7% 4 4 5% 3 4 5% 30%	2833
	11th to 20th	Night	21% 10% 3 8% 5% 4 4 4 5% 6% 30%	2505
	21st to end	Night	11% 7% 2 7% 6% 5% 5% 4 6% 9% 38%	2738
June	1st to 10th	Night	13% 6% 2 6% 5% 4 4 4 5% 8% 44%	1520
	11th to 20th	Night	11% 6% 3 6% 4 5% 6% 4 6% 10% 41%	1520
	21st to end	Night	10% 5% 2 6% 5% 4 5% 4 8% 10% 41%	1520
July	1st to 10th	Night	9% 6% 2 7% 5% 6% 4 4 7% 9% 41%	2520
	11th to 20th	Night	6% 4 2 6% 5% 5% 6% 5% 7% 11% 44%	2520
	21st to end	Night	11% 6% 3 8% 4 5% 4 4 5% 7% 41%	3071
August	1st to 10th	Night	17% 5% 2 6% 4 5% 5% 4 6% 8% 36%	2825
	11th to 20th	Night	14% 7% 3 7% 3 5% 5% 3 6% 7% 40%	2807
	21st to end	Night	12% 5% 2 7% 4 4 4 4 7% 8% 44%	3476
September	1st to 10th	Night	15% 6% 2 6% 4 4 4 3 5% 7% 45%	1900
	11th to 20th	Night	11% 6% 3 4 3 3 3 2 4 8% 52%	1900
	21st to end	Night	18% 6% 2 7% 5% 4 4 3 5% 6% 39%	2190
October	1st to 10th	Night	16% 7% 2 6% 4 4 4 3 5% 7% 43%	2280
	11th to 20th	Night	16% 7% 3 7% 4 3 4 4 6% 6% 41%	2280
	21st to end	Night	19% 9% 3 6% 4 3 4 3 5% 6% 37%	2508
November	1st to 10th	Night	10% 8% 3 6% 4 4 3 3 5% 7% 48%	2366
	11th to 20th	Night	16% 11% 4 6% 5% 5% 4 4 6% 7% 33%	2598
	21st to end	Night	15% 11% 3 8% 4 6% 5% 3 6% 6% 33%	2660
December	1st to 10th	Night	18% 13% 3 9% 5% 5% 5% 5% 7% 6% 24%	2660
	11th to 20th	Night	18% 12% 4 8% 6% 4 4 4 5% 6% 28%	3288
	21st to end	Night	20% 13% 4 11% 6% 5% 5% 4 5% 6% 21%	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	59% 5% 12% 17% 5% 2	2518
	11th to 20th	Day	68% 4 9% 13% 5% 1	2783
	21st to end	Day	70% 4 8% 13% 4 1	3124
February	1st to 10th	Day	63% 5% 10% 15% 7% 1	1710
	11th to 20th	Day	55% 6% 10% 22% 7% 1	1672
	21st to end	Day	57% 4 10% 20% 8% 2	1559
March	1st to 10th	Day	55% 6% 9% 23% 6% 1	3389
	11th to 20th	Day	48% 6% 15% 20% 9% 2	3480
	21st to end	Day	47% 5% 11% 21% 14% 2	3865
April	1st to 10th	Day	52% 5% 10% 19% 12% 2	2280
	11th to 20th	Day	48% 5% 11% 19% 15% 2	2254
	21st to end	Day	50% 6% 9% 19% 14% 3	2343
May	1st to 10th	Day	55% 5% 9% 21% 9% 1	4120
	11th to 20th	Day	55% 7% 12% 16% 8% 2	4392
	21st to end	Day	38% 8% 13% 25% 13% 2	4837
June	1st to 10th	Day	45% 8% 11% 22% 14% 1	2660
	11th to 20th	Day	45% 6% 14% 21% 13% 1	2660
	21st to end	Day	39% 8% 12% 27% 13%	2660
July	1st to 10th	Day	39% 9% 15% 25% 11% 1	4370
	11th to 20th	Day	36% 9% 15% 24% 14% 1	4365
	21st to end	Day	41% 8% 12% 23% 15%	4335
August	1st to 10th	Day	48% 8% 14% 20% 9%	4091
	11th to 20th	Day	44% 9% 12% 26% 9%	4029
	21st to end	Day	38% 7% 12% 29% 12% 2	4180
September	1st to 10th	Day	42% 5% 9% 25% 16% 3	2280
	11th to 20th	Day	36% 5% 11% 25% 20% 2	2280
	21st to end	Day	48% 5% 10% 19% 16% 1	1983
October	1st to 10th	Day	45% 6% 12% 22% 14% 2	1900
	11th to 20th	Day	47% 6% 11% 23% 12% 1	1900
	21st to end	Day	49% 5% 13% 23% 10% 1	2090
November	1st to 10th	Day	41% 5% 13% 22% 15% 3	1734
	11th to 20th	Day	53% 5% 10% 21% 9% 2	1577
	21st to end	Day	53% 6% 11% 21% 8% 1	1520
December	1st to 10th	Day	64% 5% 12% 13% 6%	1520
	11th to 20th	Day	58% 5% 14% 18% 5%	1906
	21st to end	Day	70% 5% 11% 11% 3	2772
January	1st to 10th	Night	55% 7% 13% 18% 7% 1	4429
	11th to 20th	Night	62% 6% 12% 13% 6% 1	4175
	21st to end	Night	65% 5% 9% 14% 6% 1	4532
February	1st to 10th	Night	54% 5% 13% 20% 8% 1	2470
	11th to 20th	Night	53% 5% 10% 20% 11%	2405
	21st to end	Night	55% 5% 9% 18% 11% 2	1894
March	1st to 10th	Night	55% 5% 9% 21% 8% 1	3462
	11th to 20th	Night	47% 7% 14% 23% 9% 1	3480
	21st to end	Night	43% 4 9% 22% 18% 3	3766
April	1st to 10th	Night	52% 5% 9% 19% 14% 1	1900
	11th to 20th	Night	45% 6% 10% 22% 14% 2	1875
	21st to end	Night	45% 6% 9% 24% 14% 3	1853
May	1st to 10th	Night	56% 5% 9% 19% 9% 2	2840
	11th to 20th	Night	54% 8% 12% 16% 10% 1	2506
	21st to end	Night	39% 8% 15% 20% 13% 5%	2739
June	1st to 10th	Night	38% 7% 12% 25% 15% 2	1520
	11th to 20th	Night	39% 7% 15% 23% 14% 2	1520
	21st to end	Night	36% 8% 13% 29% 14% 1	1520
July	1st to 10th	Night	39% 8% 13% 22% 15% 3	2480
	11th to 20th	Night	31% 10% 16% 27% 16% 1	2472
	21st to end	Night	40% 8% 12% 18% 20% 2	2973
August	1st to 10th	Night	44% 9% 15% 23% 9%	2814
	11th to 20th	Night	41% 7% 12% 28% 12%	2834
	21st to end	Night	34% 8% 13% 32% 12% 2	3476
September	1st to 10th	Night	39% 6% 10% 25% 17% 3	1900
	11th to 20th	Night	32% 5% 12% 29% 21% 1	1900
	21st to end	Night	44% 6% 11% 22% 16% 1	2190
October	1st to 10th	Night	41% 6% 14% 23% 15% 1	2280
	11th to 20th	Night	42% 5% 13% 24% 14% 2	2280
	21st to end	Night	47% 5% 12% 23% 13% 1	2508
November	1st to 10th	Night	37% 4 13% 25% 18% 3	2366
	11th to 20th	Night	48% 5% 11% 21% 12% 3	2598
	21st to end	Night	50% 5% 13% 22% 8% 1	2660
December	1st to 10th	Night	57% 7% 13% 17% 6%	2660
	11th to 20th	Night	56% 5% 12% 20% 7%	3288
	21st to end	Night	61% 7% 14% 15% 3	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	33% 23% 28% 9% 4 2	180
	11th to 20th	Day	38% 22% 29% 11% 1	256
	21st to end	Day	28% 31% 28% 10% 3	297
February	1st to 10th	Day	30% 29% 28% 9% 3	270
	11th to 20th	Day	39% 23% 34% 3 1	270
	21st to end	Day	35% 24% 24% 15% 2	371
March	1st to 10th	Day	31% 23% 26% 15% 4	460
	11th to 20th	Day	32% 24% 26% 14% 2 2	460
	21st to end	Day	31% 22% 27% 14% 5% 2	506
April	1st to 10th	Day	30% 23% 26% 15% 5% 1	460
	11th to 20th	Day	28% 22% 23% 16% 8% 3	452
	21st to end	Day	28% 19% 32% 13% 7% 1	460
May	1st to 10th	Day	33% 17% 25% 14% 8% 3	463
	11th to 20th	Day	23% 17% 27% 19% 9% 5%	487
	21st to end	Day	19% 12% 27% 22% 15% 4	529
June	1st to 10th	Day	19% 13% 29% 24% 13% 2	490
	11th to 20th	Day	18% 14% 24% 27% 14% 3	490
	21st to end	Day	14% 16% 31% 26% 10% 3	490
July	1st to 10th	Day	12% 9% 26% 29% 18% 7%	485
	11th to 20th	Day	8% 8% 31% 30% 17% 6%	484
	21st to end	Day	12% 10% 30% 28% 14% 5%	532
August	1st to 10th	Day	12% 8% 26% 27% 21% 6%	486
	11th to 20th	Day	15% 8% 23% 27% 18% 8%	479
	21st to end	Day	14% 11% 24% 26% 16% 10%	539
September	1st to 10th	Day	19% 10% 20% 25% 18% 9%	490
	11th to 20th	Day	14% 7% 21% 26% 22% 9%	490
	21st to end	Day	25% 12% 25% 20% 15% 4	490
October	1st to 10th	Day	22% 12% 23% 22% 17% 5%	490
	11th to 20th	Day	24% 17% 27% 21% 9% 2	490
	21st to end	Day	24% 18% 29% 20% 9% 1	539
November	1st to 10th	Day	21% 18% 24% 24% 11% 2	395
	11th to 20th	Day	29% 24% 23% 17% 6% 1	237
	21st to end	Day	24% 27% 34% 12% 3	180
December	1st to 10th	Day	37% 24% 23% 11% 4 1	180
	11th to 20th	Day	37% 21% 27% 14% 1 1	180
	21st to end	Day	35% 22% 28% 11% 4	198
January	1st to 10th	Night	23% 25% 33% 16% 3	760
	11th to 20th	Night	28% 20% 27% 21% 4	760
	21st to end	Night	23% 24% 29% 22% 2	836
February	1st to 10th	Night	28% 19% 29% 22% 2	760
	11th to 20th	Night	30% 25% 29% 15% 1	743
	21st to end	Night	30% 21% 29% 19% 3	628
March	1st to 10th	Night	28% 19% 29% 21% 3	760
	11th to 20th	Night	28% 19% 27% 21% 6%	760
	21st to end	Night	23% 19% 30% 21% 6%	836
April	1st to 10th	Night	28% 17% 29% 21% 5%	760
	11th to 20th	Night	22% 18% 30% 22% 8% 1	751
	21st to end	Night	25% 12% 27% 28% 8%	713
May	1st to 10th	Night	25% 10% 22% 31% 11% 1	570
	11th to 20th	Night	17% 12% 28% 33% 10%	384
	21st to end	Night	12% 9% 24% 33% 21% 1	411
June	1st to 10th	Night	14% 8% 21% 39% 18% 1	380
	11th to 20th	Night	13% 8% 20% 44% 15%	380
	21st to end	Night	11% 5% 28% 39% 17%	380
July	1st to 10th	Night	11% 8% 19% 36% 24% 2	370
	11th to 20th	Night	7% 2 20% 40% 29% 2	368
	21st to end	Night	10% 5% 19% 41% 23% 2	608
August	1st to 10th	Night	10% 4 16% 41% 27% 2	567
	11th to 20th	Night	13% 6% 11% 38% 27% 5%	573
	21st to end	Night	12% 6% 15% 36% 28% 3	836
September	1st to 10th	Night	17% 6% 19% 31% 25% 3	760
	11th to 20th	Night	13% 7% 19% 26% 29% 6%	760
	21st to end	Night	20% 9% 18% 29% 20% 3	760
October	1st to 10th	Night	20% 10% 20% 26% 20% 4	760
	11th to 20th	Night	20% 15% 24% 29% 10% 1	760
	21st to end	Night	26% 15% 23% 28% 8% 1	836
November	1st to 10th	Night	16% 14% 26% 33% 11% 1	745
	11th to 20th	Night	27% 16% 24% 25% 7% 2	760
	21st to end	Night	25% 17% 27% 25% 5% 1	760
December	1st to 10th	Night	30% 19% 29% 17% 5%	760
	11th to 20th	Night	29% 16% 28% 23% 4	760
	21st to end	Night	25% 20% 27% 26% 2	836

Page generated at 2024-10-30 01:23:00. Version ac07

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