Kunkle Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kunkle Park clear sky chart from 2005-11-06 to 2024-04-10.

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	18% 11% 4 7% 6% 3 5% 4 5% 7% 30%	83222
	Night	18% 11% 4 7% 6% 3 4 4 5% 6% 32%	85545
Transparency	Day	53% 6% 11% 19% 9% 1	82939
	Night	53% 5% 11% 20% 10% 1	85347
Seeing	Day	24% 14% 26% 20% 11% 4	13892
	Night	23% 12% 25% 27% 12% 1	23690

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	20% 20% 11% 11% 5% 2 3 3 3 4 18%	2754
	11th to 20th	Day	13% 22% 9% 15% 11% 3 3 2 2 3 16%	2840
	21st to end	Day	25% 21% 7% 11% 8% 3 4 3 2 4 12%	3124
February	1st to 10th	Day	21% 15% 6% 11% 7% 3 4 4 3 5% 20%	1710
	11th to 20th	Day	17% 14% 7% 12% 6% 3 5% 4 5% 6% 21%	1663
	21st to end	Day	21% 15% 4 11% 6% 3 4 3 4 5% 25%	1565
March	1st to 10th	Day	21% 12% 5% 7% 5% 3 4 4 5% 6% 29%	3435
	11th to 20th	Day	15% 11% 6% 7% 7% 3 5% 4 3 5% 32%	3480
	21st to end	Day	19% 10% 3 7% 6% 4 4 5% 5% 6% 31%	3815
April	1st to 10th	Day	16% 12% 4 7% 5% 4 4 6% 6% 7% 30%	2201
	11th to 20th	Day	17% 11% 3 6% 6% 3 4 5% 5% 6% 33%	2134
	21st to end	Day	22% 9% 3 7% 5% 3 4 4 5% 6% 33%	2340
May	1st to 10th	Day	20% 8% 3 5% 6% 3 5% 5% 6% 7% 29%	2340
	11th to 20th	Day	22% 8% 3 6% 7% 4 5% 4 5% 6% 29%	2301
	21st to end	Day	14% 6% 2 5% 5% 4 6% 5% 7% 9% 38%	2716
June	1st to 10th	Day	15% 6% 3 6% 6% 4 6% 6% 6% 9% 34%	2520
	11th to 20th	Day	15% 7% 2 6% 5% 4 5% 6% 7% 9% 34%	2520
	21st to end	Day	14% 6% 3 6% 7% 3 5% 4 6% 10% 36%	2520
July	1st to 10th	Day	12% 6% 3 5% 7% 4 5% 5% 6% 7% 39%	2498
	11th to 20th	Day	13% 6% 3 6% 5% 4 5% 5% 7% 11% 36%	2340
	21st to end	Day	13% 5% 3 7% 6% 5% 7% 6% 6% 8% 34%	2547
August	1st to 10th	Day	11% 6% 3 6% 6% 4 7% 7% 7% 10% 34%	2327
	11th to 20th	Day	14% 6% 3 5% 6% 3 6% 5% 8% 10% 33%	2303
	21st to end	Day	14% 5% 2 6% 5% 3 5% 6% 7% 9% 38%	2435
September	1st to 10th	Day	17% 6% 3 5% 5% 2 5% 4 5% 6% 43%	2160
	11th to 20th	Day	13% 6% 2 5% 6% 3 4 5% 5% 8% 44%	2019
	21st to end	Day	18% 8% 3 6% 5% 3 3 4 5% 7% 37%	1959
October	1st to 10th	Day	18% 5% 3 6% 5% 3 4 5% 6% 8% 38%	1800
	11th to 20th	Day	21% 8% 2 6% 5% 4 5% 5% 5% 6% 34%	1800
	21st to end	Day	24% 10% 3 6% 5% 2 3 4 5% 6% 31%	1980
November	1st to 10th	Day	13% 8% 3 6% 6% 3 5% 4 4 7% 41%	1809
	11th to 20th	Day	19% 13% 4 5% 5% 3 5% 4 5% 6% 32%	1545
	21st to end	Day	19% 16% 5% 7% 5% 4 5% 4 4 5% 26%	1520
December	1st to 10th	Day	22% 18% 7% 10% 6% 3 4 3 3 6% 17%	1520
	11th to 20th	Day	20% 19% 7% 9% 6% 2 3 4 4 6% 21%	1910
	21st to end	Day	25% 22% 8% 8% 5% 3 3 3 4 4 14%	2772
January	1st to 10th	Night	17% 20% 8% 10% 5% 3 4 4 4 4 19%	4173
	11th to 20th	Night	17% 18% 7% 13% 8% 4 5% 4 4 4 16%	4120
	21st to end	Night	29% 16% 8% 8% 8% 3 3 2 3 3 17%	4532
February	1st to 10th	Night	20% 13% 6% 9% 7% 3 4 4 4 5% 24%	2470
	11th to 20th	Night	19% 14% 5% 11% 6% 3 5% 4 4 5% 25%	2403
	21st to end	Night	22% 12% 5% 10% 6% 3 4 4 5% 5% 26%	1885
March	1st to 10th	Night	23% 11% 3 6% 5% 2 4 4 4 5% 33%	3418
	11th to 20th	Night	18% 14% 5% 6% 4 3 3 3 4 7% 34%	3480
	21st to end	Night	17% 9% 3 6% 6% 3 4 4 4 5% 39%	3817
April	1st to 10th	Night	19% 12% 4 6% 4 4 4 4 3 5% 35%	1967
	11th to 20th	Night	16% 8% 2 7% 4 3 5% 5% 6% 6% 38%	1775
	21st to end	Night	16% 9% 3 7% 6% 3 5% 3 5% 7% 36%	1634
May	1st to 10th	Night	20% 8% 3 6% 6% 3 5% 5% 6% 6% 33%	1620
	11th to 20th	Night	19% 7% 2 6% 6% 3 4 4 5% 7% 36%	1592
	21st to end	Night	10% 6% 2 4 4 3 5% 5% 7% 9% 45%	1557
June	1st to 10th	Night	12% 6% 2 4 5% 3 5% 5% 6% 8% 43%	1440
	11th to 20th	Night	11% 7% 3 6% 5% 3 5% 5% 6% 8% 41%	1440
	21st to end	Night	12% 5% 2 4 5% 3 5% 6% 6% 10% 42%	1440
July	1st to 10th	Night	10% 4 3 6% 5% 4 5% 5% 6% 8% 43%	1458
	11th to 20th	Night	10% 4 2 4 5% 3 6% 5% 6% 10% 46%	1620
	21st to end	Night	12% 5% 2 5% 6% 3 6% 6% 7% 10% 38%	1771
August	1st to 10th	Night	7% 5% 2 5% 6% 4 5% 6% 6% 10% 44%	1611
	11th to 20th	Night	11% 6% 2 6% 6% 4 5% 4 6% 9% 43%	1598
	21st to end	Night	11% 5% 2 5% 4 3 5% 5% 7% 9% 44%	1903
September	1st to 10th	Night	13% 5% 1 5% 3 2 5% 5% 5% 7% 48%	1800
	11th to 20th	Night	10% 4 2 4 4 2 4 4 5% 8% 52%	1937
	21st to end	Night	16% 8% 3 5% 5% 2 5% 4 5% 7% 41%	2000
October	1st to 10th	Night	15% 6% 2 6% 5% 3 4 5% 5% 7% 43%	2160
	11th to 20th	Night	19% 6% 2 5% 6% 3 4 4 5% 7% 38%	2160
	21st to end	Night	25% 8% 3 5% 4 2 4 3 4 6% 35%	2376
November	1st to 10th	Night	13% 9% 3 6% 4 2 4 4 4 6% 43%	2267
	11th to 20th	Night	20% 11% 3 5% 6% 3 5% 4 5% 6% 31%	2632
	21st to end	Night	19% 14% 5% 5% 5% 3 4 4 4 6% 30%	2660
December	1st to 10th	Night	22% 16% 9% 9% 7% 3 4 4 4 5% 20%	2660
	11th to 20th	Night	20% 16% 7% 9% 7% 3 4 4 4 5% 23%	3285
	21st to end	Night	25% 19% 6% 8% 6% 4 4 4 4 6% 14%	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	72% 3 8% 12% 5%	2755
	11th to 20th	Day	75% 3 7% 11% 3 1	2840
	21st to end	Day	79% 3 7% 8% 2	3124
February	1st to 10th	Day	69% 3 7% 14% 6% 1	1710
	11th to 20th	Day	64% 5% 10% 15% 6%	1672
	21st to end	Day	63% 4 10% 15% 7% 1	1565
March	1st to 10th	Day	55% 4 12% 23% 6%	3435
	11th to 20th	Day	54% 6% 12% 22% 6% 1	3480
	21st to end	Day	52% 6% 11% 20% 10% 1	3815
April	1st to 10th	Day	53% 5% 11% 18% 11% 2	2201
	11th to 20th	Day	52% 4 11% 16% 15% 2	2134
	21st to end	Day	52% 6% 10% 21% 10% 2	2340
May	1st to 10th	Day	52% 6% 12% 18% 9% 2	2340
	11th to 20th	Day	54% 6% 11% 15% 11% 2	2305
	21st to end	Day	40% 8% 19% 23% 8% 2	2716
June	1st to 10th	Day	46% 8% 13% 21% 11% 1	2520
	11th to 20th	Day	45% 8% 15% 20% 11% 1	2520
	21st to end	Day	44% 7% 11% 26% 11% 1	2520
July	1st to 10th	Day	43% 8% 11% 22% 13% 3	2429
	11th to 20th	Day	40% 8% 15% 24% 14% 1	2271
	21st to end	Day	46% 8% 11% 21% 14% 1	2405
August	1st to 10th	Day	43% 9% 14% 25% 8%	2314
	11th to 20th	Day	44% 8% 14% 24% 10% 1	2303
	21st to end	Day	40% 7% 13% 24% 13% 3	2435
September	1st to 10th	Day	43% 6% 10% 21% 17% 3	2160
	11th to 20th	Day	39% 6% 12% 27% 15% 1	2019
	21st to end	Day	47% 5% 10% 23% 14% 1	1959
October	1st to 10th	Day	43% 6% 14% 21% 15% 1	1800
	11th to 20th	Day	50% 6% 11% 24% 10%	1800
	21st to end	Day	54% 5% 11% 19% 10% 1	1980
November	1st to 10th	Day	44% 4 12% 21% 16% 3	1809
	11th to 20th	Day	54% 4 11% 19% 10% 2	1545
	21st to end	Day	60% 5% 12% 17% 6% 1	1520
December	1st to 10th	Day	72% 3 9% 12% 3	1520
	11th to 20th	Day	67% 4 12% 15% 3	1906
	21st to end	Day	75% 3 9% 10% 3	2772
January	1st to 10th	Night	70% 4 9% 13% 3	4173
	11th to 20th	Night	73% 5% 10% 11% 2	4120
	21st to end	Night	75% 3 7% 12% 3	4532
February	1st to 10th	Night	63% 4 9% 17% 7%	2470
	11th to 20th	Night	62% 4 9% 17% 7%	2405
	21st to end	Night	61% 4 9% 16% 9% 1	1885
March	1st to 10th	Night	54% 4 9% 24% 8%	3418
	11th to 20th	Night	52% 4 13% 24% 6% 1	3480
	21st to end	Night	47% 5% 10% 23% 14% 2	3817
April	1st to 10th	Night	52% 5% 9% 19% 13% 1	1967
	11th to 20th	Night	45% 6% 11% 19% 16% 3	1775
	21st to end	Night	48% 6% 9% 23% 11% 3	1634
May	1st to 10th	Night	50% 6% 9% 19% 13% 3	1620
	11th to 20th	Night	49% 6% 11% 17% 15% 3	1593
	21st to end	Night	34% 7% 17% 27% 13% 2	1558
June	1st to 10th	Night	38% 7% 12% 27% 14% 1	1440
	11th to 20th	Night	40% 7% 15% 23% 14% 1	1440
	21st to end	Night	37% 8% 14% 24% 17% 1	1440
July	1st to 10th	Night	38% 8% 12% 22% 15% 4	1417
	11th to 20th	Night	33% 6% 15% 25% 19% 2	1566
	21st to end	Night	39% 8% 15% 22% 14% 3	1672
August	1st to 10th	Night	35% 8% 15% 27% 15%	1600
	11th to 20th	Night	38% 6% 15% 26% 14% 2	1598
	21st to end	Night	36% 7% 14% 26% 15% 4	1903
September	1st to 10th	Night	34% 7% 12% 25% 19% 5%	1800
	11th to 20th	Night	30% 5% 14% 28% 22% 1	1937
	21st to end	Night	43% 5% 11% 22% 16% 2	2000
October	1st to 10th	Night	41% 6% 11% 25% 14% 2	2160
	11th to 20th	Night	46% 4 12% 24% 12% 1	2160
	21st to end	Night	52% 4 11% 21% 12% 1	2376
November	1st to 10th	Night	43% 4 11% 22% 17% 4	2267
	11th to 20th	Night	53% 5% 9% 20% 11% 2	2632
	21st to end	Night	56% 4 11% 21% 7% 1	2660
December	1st to 10th	Night	68% 5% 10% 12% 4	2660
	11th to 20th	Night	65% 4 11% 16% 4	3288
	21st to end	Night	72% 5% 11% 10% 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	31% 26% 25% 11% 5% 2	249
	11th to 20th	Day	37% 28% 26% 6% 2 1	270
	21st to end	Day	34% 26% 27% 9% 4	297
February	1st to 10th	Day	34% 23% 34% 7% 2	270
	11th to 20th	Day	38% 30% 26% 6% 1	270
	21st to end	Day	41% 24% 27% 7% 1	277
March	1st to 10th	Day	31% 22% 29% 14% 4	460
	11th to 20th	Day	34% 20% 29% 12% 5% 1	460
	21st to end	Day	33% 19% 26% 17% 5% 1	506
April	1st to 10th	Day	29% 21% 25% 18% 7% 1	457
	11th to 20th	Day	24% 21% 28% 14% 9% 4	412
	21st to end	Day	31% 17% 27% 17% 5% 2	420
May	1st to 10th	Day	31% 15% 25% 17% 8% 3	423
	11th to 20th	Day	23% 13% 32% 18% 11% 4	447
	21st to end	Day	20% 5% 27% 26% 15% 7%	485
June	1st to 10th	Day	16% 10% 30% 27% 13% 4	450
	11th to 20th	Day	20% 12% 23% 25% 16% 4	450
	21st to end	Day	16% 9% 28% 30% 15% 2	450
July	1st to 10th	Day	14% 8% 18% 27% 22% 11%	445
	11th to 20th	Day	13% 7% 25% 31% 17% 8%	444
	21st to end	Day	16% 4 25% 31% 18% 7%	488
August	1st to 10th	Day	13% 5% 21% 30% 21% 11%	446
	11th to 20th	Day	17% 5% 19% 28% 20% 11%	439
	21st to end	Day	13% 6% 25% 24% 21% 11%	495
September	1st to 10th	Day	20% 7% 19% 27% 16% 11%	450
	11th to 20th	Day	16% 3 19% 32% 20% 11%	450
	21st to end	Day	23% 11% 22% 24% 13% 6%	450
October	1st to 10th	Day	20% 8% 25% 23% 20% 4	450
	11th to 20th	Day	26% 14% 28% 22% 9% 1	450
	21st to end	Day	31% 14% 31% 15% 8% 1	495
November	1st to 10th	Day	20% 14% 30% 22% 10% 4	407
	11th to 20th	Day	33% 17% 28% 14% 6% 2	192
	21st to end	Day	26% 23% 40% 9% 2 1	180
December	1st to 10th	Day	37% 27% 20% 11% 4 1	180
	11th to 20th	Day	34% 22% 30% 11% 4	180
	21st to end	Day	36% 21% 29% 11% 4	198
January	1st to 10th	Night	30% 22% 29% 15% 3	760
	11th to 20th	Night	33% 19% 27% 17% 3	760
	21st to end	Night	30% 20% 29% 19% 3	836
February	1st to 10th	Night	29% 17% 28% 23% 2	760
	11th to 20th	Night	31% 20% 32% 16% 1	743
	21st to end	Night	30% 17% 31% 20% 2	628
March	1st to 10th	Night	27% 18% 30% 23% 3	760
	11th to 20th	Night	30% 18% 25% 20% 7% 1	760
	21st to end	Night	25% 16% 31% 22% 5% 1	836
April	1st to 10th	Night	28% 16% 28% 22% 6%	760
	11th to 20th	Night	24% 13% 30% 23% 10% 1	711
	21st to end	Night	19% 11% 33% 29% 7% 1	554
May	1st to 10th	Night	23% 10% 24% 33% 9% 1	540
	11th to 20th	Night	22% 8% 26% 33% 12%	531
	21st to end	Night	11% 3 27% 32% 24% 3	397
June	1st to 10th	Night	11% 5% 24% 42% 17% 1	360
	11th to 20th	Night	13% 6% 22% 37% 19% 2	360
	21st to end	Night	13% 4 28% 35% 19% 1	360
July	1st to 10th	Night	10% 2 18% 42% 23% 4	367
	11th to 20th	Night	11% 3 15% 38% 29% 4	522
	21st to end	Night	12% 3 15% 41% 27% 2	591
August	1st to 10th	Night	9% 4 12% 43% 30% 2	537
	11th to 20th	Night	12% 4 12% 37% 30% 5%	534
	21st to end	Night	13% 4 16% 33% 29% 5%	715
September	1st to 10th	Night	15% 4 17% 34% 26% 4	720
	11th to 20th	Night	11% 4 16% 37% 27% 5%	720
	21st to end	Night	19% 7% 22% 29% 20% 3	720
October	1st to 10th	Night	18% 7% 23% 29% 21% 2	720
	11th to 20th	Night	23% 11% 27% 29% 9% 1	720
	21st to end	Night	29% 13% 24% 26% 7%	792
November	1st to 10th	Night	18% 11% 26% 32% 11% 1	740
	11th to 20th	Night	28% 15% 26% 24% 7% 1	760
	21st to end	Night	29% 14% 30% 21% 6% 1	760
December	1st to 10th	Night	32% 17% 28% 18% 4	760
	11th to 20th	Night	29% 21% 26% 20% 3	760
	21st to end	Night	32% 17% 27% 22% 2	836

Page generated at 2024-04-07 09:28:09. Version ac07

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