Prince Gallitzin State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Prince Gallitzin State Park clear sky chart from 2005-11-05 to 2024-10-14.

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% 11% 4 9% 6% 5% 5% 4 5% 7% 30%	101056
	Night	15% 11% 4 9% 5% 5% 4 4 5% 6% 32%	97444
Transparency	Day	52% 7% 11% 19% 10% 1	100859
	Night	51% 7% 11% 19% 10% 1	97317
Seeing	Day	24% 18% 28% 18% 9% 3	14670
	Night	23% 18% 26% 23% 10% 1	24175

By Month

Percentage Cloud Cover SE (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% 17% 9% 16% 5% 4 4 2 4 5% 20%	2610
	11th to 20th	Day	10% 18% 9% 19% 8% 5% 4 3 3 3 16%	2840
	21st to end	Day	20% 18% 11% 14% 7% 4 3 3 3 4 12%	3124
February	1st to 10th	Day	15% 18% 5% 12% 7% 5% 5% 3 4 5% 20%	1710
	11th to 20th	Day	15% 12% 6% 13% 7% 5% 5% 5% 5% 5% 21%	1663
	21st to end	Day	18% 14% 5% 11% 6% 4 3 4 4 5% 25%	1545
March	1st to 10th	Day	18% 10% 6% 9% 6% 4 4 4 5% 6% 28%	3435
	11th to 20th	Day	11% 12% 7% 11% 5% 6% 5% 4 5% 5% 30%	3480
	21st to end	Day	15% 10% 3 7% 5% 5% 5% 4 5% 6% 34%	3815
April	1st to 10th	Day	13% 16% 4 7% 6% 4 5% 4 6% 6% 29%	2261
	11th to 20th	Day	15% 12% 3 6% 6% 5% 5% 4 5% 6% 34%	2254
	21st to end	Day	19% 11% 3 8% 5% 5% 4 3 5% 6% 31%	2398
May	1st to 10th	Day	25% 10% 4 7% 4 5% 4 3 5% 6% 27%	4082
	11th to 20th	Day	21% 11% 3 7% 5% 5% 5% 4 5% 7% 27%	4236
	21st to end	Day	12% 6% 2 7% 5% 5% 6% 4 7% 9% 37%	4823
June	1st to 10th	Day	15% 8% 3 7% 5% 5% 6% 5% 6% 8% 33%	2660
	11th to 20th	Day	14% 7% 3 7% 6% 5% 5% 4 7% 9% 33%	2660
	21st to end	Day	13% 7% 2 6% 6% 4 5% 5% 6% 9% 36%	2660
July	1st to 10th	Day	9% 7% 3 8% 6% 6% 5% 5% 7% 8% 37%	4440
	11th to 20th	Day	9% 6% 2 7% 6% 6% 5% 5% 8% 10% 37%	4280
	21st to end	Day	11% 8% 3 9% 7% 5% 5% 4 6% 7% 36%	4466
August	1st to 10th	Day	18% 8% 3 7% 6% 5% 6% 5% 6% 8% 28%	4104
	11th to 20th	Day	13% 6% 3 8% 7% 6% 6% 5% 7% 7% 33%	4044
	21st to end	Day	10% 6% 3 8% 5% 5% 5% 4 6% 8% 40%	4190
September	1st to 10th	Day	16% 8% 2 6% 4 4 5% 3 5% 7% 41%	2280
	11th to 20th	Day	13% 7% 2 7% 4 4 4 3 5% 8% 44%	2214
	21st to end	Day	19% 9% 3 7% 5% 4 4 4 6% 5% 33%	2019
October	1st to 10th	Day	15% 8% 2 8% 6% 5% 4 3 5% 6% 37%	1900
	11th to 20th	Day	17% 11% 3 7% 5% 5% 5% 3 5% 5% 34%	1830
	21st to end	Day	19% 13% 3 7% 5% 4 4 4 5% 6% 31%	1980
November	1st to 10th	Day	11% 10% 4 8% 5% 5% 4 4 6% 5% 39%	1796
	11th to 20th	Day	14% 13% 5% 9% 5% 5% 5% 4 5% 7% 28%	1535
	21st to end	Day	16% 15% 7% 9% 6% 5% 4 3 4 6% 25%	1520
December	1st to 10th	Day	17% 17% 8% 12% 8% 5% 4 3 6% 3 17%	1520
	11th to 20th	Day	16% 17% 6% 13% 5% 4 3 3 5% 6% 22%	1910
	21st to end	Day	21% 23% 8% 11% 5% 4 3 3 4 4 14%	2772
January	1st to 10th	Night	12% 18% 10% 16% 5% 5% 5% 3 4 4 18%	4333
	11th to 20th	Night	12% 16% 9% 17% 7% 7% 5% 3 4 5% 16%	4120
	21st to end	Night	20% 18% 7% 13% 8% 4 3 2 3 4 17%	4532
February	1st to 10th	Night	14% 13% 5% 12% 7% 6% 5% 4 5% 4 26%	2470
	11th to 20th	Night	14% 12% 5% 12% 7% 6% 6% 4 5% 6% 23%	2403
	21st to end	Night	16% 13% 5% 12% 6% 4 4 4 4 5% 27%	1903
March	1st to 10th	Night	20% 11% 4 8% 5% 5% 4 4 5% 6% 28%	3418
	11th to 20th	Night	12% 9% 7% 9% 5% 4 5% 3 6% 6% 33%	3480
	21st to end	Night	13% 11% 3 9% 4 4 4 3 5% 6% 39%	3817
April	1st to 10th	Night	14% 14% 4 9% 6% 4 4 3 5% 5% 32%	1917
	11th to 20th	Night	14% 9% 3 6% 5% 4 4 4 5% 8% 37%	1875
	21st to end	Night	14% 10% 3 9% 5% 4 4 3 5% 7% 37%	1798
May	1st to 10th	Night	26% 10% 2 8% 5% 4 4 3 4 6% 28%	2813
	11th to 20th	Night	21% 13% 2 7% 5% 4 4 4 4 5% 30%	2655
	21st to end	Night	12% 9% 3 8% 4 4 5% 4 6% 9% 36%	2732
June	1st to 10th	Night	11% 7% 3 6% 5% 5% 4 4 6% 8% 43%	1520
	11th to 20th	Night	11% 5% 3 6% 6% 5% 5% 4 6% 9% 40%	1520
	21st to end	Night	10% 5% 2 5% 5% 5% 5% 5% 7% 10% 42%	1520
July	1st to 10th	Night	10% 7% 3 8% 5% 6% 5% 5% 6% 8% 38%	2520
	11th to 20th	Night	7% 5% 2 6% 5% 5% 5% 4 7% 10% 44%	2675
	21st to end	Night	12% 8% 2 7% 5% 5% 4 3 6% 7% 40%	3087
August	1st to 10th	Night	18% 7% 2 7% 4 5% 4 5% 6% 8% 34%	2825
	11th to 20th	Night	13% 9% 2 7% 4 4 5% 4 5% 7% 41%	2785
	21st to end	Night	9% 6% 2 8% 4 4 4 4 6% 8% 45%	3434
September	1st to 10th	Night	14% 6% 2 6% 4 4 5% 3 5% 6% 46%	1900
	11th to 20th	Night	10% 6% 2 5% 3 4 3 4 6% 8% 50%	1962
	21st to end	Night	18% 7% 3 6% 4 4 4 3 4 7% 39%	2160
October	1st to 10th	Night	15% 8% 2 6% 4 4 4 3 5% 7% 42%	2280
	11th to 20th	Night	16% 9% 2 6% 4 5% 4 4 4 6% 38%	2203
	21st to end	Night	20% 12% 3 7% 4 3 4 3 5% 6% 34%	2376
November	1st to 10th	Night	10% 10% 4 7% 4 4 4 4 4 6% 44%	2281
	11th to 20th	Night	15% 12% 4 8% 6% 5% 4 5% 5% 6% 31%	2641
	21st to end	Night	16% 13% 5% 8% 7% 6% 5% 3 5% 5% 29%	2660
December	1st to 10th	Night	17% 15% 7% 12% 7% 6% 5% 4 5% 5% 17%	2660
	11th to 20th	Night	16% 12% 6% 13% 7% 5% 4 3 4 5% 24%	3285
	21st to end	Night	18% 19% 8% 12% 7% 5% 4 4 5% 5% 15%	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	67% 6% 9% 14% 3 1	2611
	11th to 20th	Day	72% 4 8% 10% 5% 1	2840
	21st to end	Day	77% 4 6% 9% 3 1	3124
February	1st to 10th	Day	65% 6% 10% 12% 6% 1	1710
	11th to 20th	Day	62% 7% 9% 15% 7%	1672
	21st to end	Day	61% 4 10% 15% 7% 2	1545
March	1st to 10th	Day	56% 6% 10% 22% 6%	3435
	11th to 20th	Day	53% 8% 15% 17% 7% 1	3480
	21st to end	Day	48% 7% 13% 20% 11% 1	3815
April	1st to 10th	Day	53% 6% 11% 16% 11% 2	2261
	11th to 20th	Day	51% 6% 9% 17% 14% 2	2254
	21st to end	Day	53% 5% 9% 20% 11% 1	2398
May	1st to 10th	Day	57% 7% 8% 19% 9% 1	4120
	11th to 20th	Day	55% 8% 12% 17% 7% 1	4240
	21st to end	Day	40% 8% 15% 22% 13% 2	4837
June	1st to 10th	Day	46% 9% 11% 22% 11% 1	2660
	11th to 20th	Day	45% 8% 13% 19% 13% 1	2660
	21st to end	Day	42% 7% 13% 25% 12%	2660
July	1st to 10th	Day	43% 8% 13% 24% 11% 2	4370
	11th to 20th	Day	38% 8% 15% 24% 14% 1	4206
	21st to end	Day	46% 7% 9% 22% 16% 1	4324
August	1st to 10th	Day	50% 10% 14% 19% 8%	4091
	11th to 20th	Day	46% 7% 11% 27% 9%	4083
	21st to end	Day	40% 7% 13% 27% 12% 2	4190
September	1st to 10th	Day	43% 6% 9% 22% 16% 3	2280
	11th to 20th	Day	38% 6% 10% 26% 18% 1	2214
	21st to end	Day	50% 7% 11% 17% 13% 1	2019
October	1st to 10th	Day	47% 6% 11% 19% 14% 2	1900
	11th to 20th	Day	51% 6% 10% 24% 10%	1831
	21st to end	Day	53% 6% 12% 17% 11% 2	1980
November	1st to 10th	Day	44% 6% 12% 19% 15% 3	1796
	11th to 20th	Day	54% 6% 12% 16% 10% 2	1535
	21st to end	Day	59% 6% 10% 18% 6%	1520
December	1st to 10th	Day	68% 7% 11% 11% 4	1520
	11th to 20th	Day	62% 5% 10% 19% 4	1906
	21st to end	Day	73% 6% 7% 11% 3	2772
January	1st to 10th	Night	67% 5% 9% 13% 6% 1	4333
	11th to 20th	Night	69% 5% 12% 10% 3	4120
	21st to end	Night	72% 5% 7% 13% 4 1	4532
February	1st to 10th	Night	58% 7% 10% 17% 8%	2470
	11th to 20th	Night	58% 6% 11% 16% 8%	2405
	21st to end	Night	58% 5% 10% 16% 10% 1	1903
March	1st to 10th	Night	55% 6% 10% 21% 7% 1	3418
	11th to 20th	Night	48% 7% 15% 22% 8% 1	3480
	21st to end	Night	45% 5% 12% 21% 16% 2	3817
April	1st to 10th	Night	54% 5% 11% 17% 12% 1	1917
	11th to 20th	Night	45% 7% 12% 19% 14% 2	1875
	21st to end	Night	46% 6% 11% 22% 12% 3	1798
May	1st to 10th	Night	57% 6% 8% 17% 10% 2	2840
	11th to 20th	Night	54% 9% 10% 18% 8% 1	2656
	21st to end	Night	42% 9% 14% 21% 11% 4	2739
June	1st to 10th	Night	38% 9% 12% 26% 14% 1	1520
	11th to 20th	Night	39% 10% 13% 24% 12% 2	1520
	21st to end	Night	35% 10% 14% 25% 15%	1520
July	1st to 10th	Night	42% 8% 12% 21% 15% 3	2480
	11th to 20th	Night	33% 8% 17% 25% 16% 1	2627
	21st to end	Night	42% 6% 13% 19% 18% 2	2988
August	1st to 10th	Night	46% 10% 14% 22% 8%	2814
	11th to 20th	Night	42% 6% 11% 29% 12%	2812
	21st to end	Night	37% 7% 12% 31% 12% 2	3434
September	1st to 10th	Night	40% 5% 10% 24% 18% 3	1900
	11th to 20th	Night	31% 6% 12% 29% 20% 1	1962
	21st to end	Night	46% 5% 12% 21% 16% 1	2160
October	1st to 10th	Night	40% 8% 13% 23% 15% 1	2280
	11th to 20th	Night	45% 6% 12% 22% 13% 1	2207
	21st to end	Night	49% 6% 11% 21% 11% 2	2376
November	1st to 10th	Night	41% 5% 13% 21% 17% 3	2281
	11th to 20th	Night	51% 7% 11% 18% 11% 3	2641
	21st to end	Night	54% 8% 11% 19% 7% 1	2660
December	1st to 10th	Night	63% 9% 11% 11% 4	2660
	11th to 20th	Night	60% 7% 11% 17% 5%	3288
	21st to end	Night	68% 8% 11% 11% 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% 31% 24% 6% 4	206
	11th to 20th	Day	41% 30% 24% 4 1	270
	21st to end	Day	33% 31% 27% 7% 1	297
February	1st to 10th	Day	34% 32% 27% 6% 1	270
	11th to 20th	Day	44% 27% 25% 4	270
	21st to end	Day	38% 28% 25% 9% 1	329
March	1st to 10th	Day	33% 25% 25% 13% 3	460
	11th to 20th	Day	33% 25% 27% 10% 4 1	460
	21st to end	Day	32% 27% 25% 11% 4 1	506
April	1st to 10th	Day	30% 27% 26% 13% 3 1	460
	11th to 20th	Day	24% 27% 25% 14% 7% 3	452
	21st to end	Day	30% 22% 32% 11% 5% 1	460
May	1st to 10th	Day	33% 18% 26% 14% 6% 2	463
	11th to 20th	Day	25% 18% 32% 14% 8% 3	487
	21st to end	Day	16% 14% 30% 23% 12% 4	529
June	1st to 10th	Day	19% 18% 28% 22% 10% 2	490
	11th to 20th	Day	22% 13% 28% 23% 11% 3	490
	21st to end	Day	16% 14% 32% 26% 9% 2	490
July	1st to 10th	Day	12% 10% 31% 23% 17% 7%	485
	11th to 20th	Day	11% 10% 33% 27% 13% 6%	484
	21st to end	Day	14% 8% 33% 28% 12% 6%	532
August	1st to 10th	Day	12% 11% 24% 28% 18% 6%	486
	11th to 20th	Day	16% 9% 26% 26% 15% 8%	479
	21st to end	Day	13% 11% 27% 25% 14% 10%	539
September	1st to 10th	Day	18% 11% 23% 25% 15% 8%	490
	11th to 20th	Day	14% 5% 24% 30% 19% 8%	490
	21st to end	Day	27% 15% 25% 17% 12% 5%	490
October	1st to 10th	Day	21% 14% 24% 23% 14% 3	490
	11th to 20th	Day	26% 20% 28% 18% 8%	462
	21st to end	Day	30% 20% 29% 16% 4	495
November	1st to 10th	Day	23% 20% 27% 19% 10% 2	426
	11th to 20th	Day	28% 26% 32% 10% 3 1	195
	21st to end	Day	31% 27% 34% 8% 1	180
December	1st to 10th	Day	39% 29% 21% 7% 2 1	180
	11th to 20th	Day	40% 21% 31% 8% 1	180
	21st to end	Day	40% 24% 26% 8% 3	198
January	1st to 10th	Night	30% 31% 26% 10% 3	760
	11th to 20th	Night	30% 29% 25% 15% 2	760
	21st to end	Night	27% 29% 30% 13% 1	836
February	1st to 10th	Night	32% 25% 26% 15% 2	760
	11th to 20th	Night	30% 33% 27% 9% 1	743
	21st to end	Night	32% 24% 28% 15% 1	628
March	1st to 10th	Night	27% 26% 27% 18% 2	760
	11th to 20th	Night	29% 26% 23% 17% 5%	760
	21st to end	Night	24% 25% 31% 15% 5%	836
April	1st to 10th	Night	27% 23% 30% 18% 3	760
	11th to 20th	Night	23% 19% 29% 20% 8%	751
	21st to end	Night	20% 16% 31% 26% 5% 1	658
May	1st to 10th	Night	23% 14% 26% 28% 9% 1	570
	11th to 20th	Night	18% 15% 26% 32% 9%	469
	21st to end	Night	13% 8% 26% 31% 20% 1	411
June	1st to 10th	Night	11% 9% 27% 35% 16% 1	380
	11th to 20th	Night	14% 7% 27% 36% 15% 1	380
	21st to end	Night	11% 7% 29% 39% 13%	380
July	1st to 10th	Night	12% 5% 21% 40% 20% 2	370
	11th to 20th	Night	9% 4 21% 39% 25% 3	458
	21st to end	Night	11% 8% 20% 39% 20% 2	624
August	1st to 10th	Night	11% 4 19% 40% 25% 2	567
	11th to 20th	Night	15% 6% 16% 37% 23% 3	564
	21st to end	Night	12% 6% 22% 34% 23% 4	807
September	1st to 10th	Night	17% 6% 22% 30% 22% 3	760
	11th to 20th	Night	13% 6% 18% 32% 26% 5%	760
	21st to end	Night	21% 12% 21% 25% 17% 3	760
October	1st to 10th	Night	19% 11% 24% 26% 18% 2	760
	11th to 20th	Night	24% 17% 28% 23% 7% 1	735
	21st to end	Night	29% 19% 25% 21% 5% 1	792
November	1st to 10th	Night	18% 18% 28% 28% 9% 1	740
	11th to 20th	Night	27% 21% 27% 18% 5% 2	760
	21st to end	Night	27% 21% 31% 17% 4 1	760
December	1st to 10th	Night	32% 26% 24% 13% 4	760
	11th to 20th	Night	30% 27% 25% 16% 2	760
	21st to end	Night	29% 25% 29% 16% 1	836

Page generated at 2024-10-11 10:49:55. Version ac07

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