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 2024-11-04.

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% 11% 4 8% 5% 4 4 4 5% 7% 31%	101158
	Night	18% 11% 4 8% 5% 4 4 3 5% 6% 32%	97776
Transparency	Day	50% 6% 11% 21% 11% 1	104804
	Night	51% 5% 11% 20% 11% 2	102269
Seeing	Day	24% 14% 26% 20% 11% 4	14723
	Night	23% 12% 25% 27% 12% 1	24345

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% 21% 10% 12% 4 3 3 2 3 4 18%	2754
	11th to 20th	Day	13% 23% 9% 17% 9% 3 2 2 2 3 16%	2840
	21st to end	Day	25% 22% 7% 14% 5% 4 3 2 3 4 12%	3124
February	1st to 10th	Day	20% 17% 5% 12% 6% 4 3 3 3 5% 20%	1710
	11th to 20th	Day	17% 16% 6% 14% 4 4 4 3 6% 5% 21%	1663
	21st to end	Day	21% 16% 4 10% 5% 4 4 2 4 5% 25%	1565
March	1st to 10th	Day	21% 13% 4 7% 4 4 3 3 5% 6% 29%	3435
	11th to 20th	Day	15% 11% 6% 8% 6% 5% 4 3 3 5% 32%	3480
	21st to end	Day	19% 10% 3 8% 5% 4 4 4 5% 6% 31%	3815
April	1st to 10th	Day	16% 13% 2 8% 5% 5% 4 4 6% 6% 30%	2211
	11th to 20th	Day	16% 12% 3 7% 6% 4 4 4 5% 6% 33%	2255
	21st to end	Day	21% 9% 3 8% 4 4 4 3 5% 6% 33%	2470
May	1st to 10th	Day	25% 9% 3 7% 5% 4 4 4 5% 6% 28%	4082
	11th to 20th	Day	20% 8% 3 8% 6% 5% 5% 4 6% 7% 29%	4081
	21st to end	Day	14% 6% 2 6% 4 5% 5% 4 7% 9% 38%	4814
June	1st to 10th	Day	14% 7% 3 7% 5% 6% 6% 5% 6% 9% 33%	2660
	11th to 20th	Day	14% 7% 2 6% 5% 5% 5% 5% 8% 9% 34%	2660
	21st to end	Day	13% 7% 3 7% 6% 5% 5% 4 6% 10% 36%	2660
July	1st to 10th	Day	10% 6% 2 6% 6% 5% 5% 4 7% 8% 40%	4390
	11th to 20th	Day	11% 6% 3 7% 4 5% 5% 4 6% 10% 39%	4120
	21st to end	Day	13% 7% 3 8% 6% 6% 5% 4 6% 7% 36%	4466
August	1st to 10th	Day	16% 9% 3 8% 5% 5% 6% 5% 6% 8% 30%	4104
	11th to 20th	Day	12% 7% 2 6% 5% 6% 6% 4 8% 8% 35%	4044
	21st to end	Day	9% 5% 2 6% 5% 5% 6% 5% 7% 10% 41%	4281
September	1st to 10th	Day	16% 7% 2 5% 4 3 4 3 5% 6% 45%	2280
	11th to 20th	Day	12% 6% 2 6% 5% 4 4 4 5% 8% 44%	2131
	21st to end	Day	20% 8% 3 7% 5% 4 3 4 5% 6% 35%	2067
October	1st to 10th	Day	18% 5% 2 6% 4 4 3 4 6% 8% 39%	1900
	11th to 20th	Day	20% 8% 2 7% 4 5% 5% 3 5% 6% 35%	1900
	21st to end	Day	23% 11% 2 7% 5% 3 3 3 5% 7% 33%	2090
November	1st to 10th	Day	12% 9% 3 7% 6% 4 4 3 4 6% 42%	1839
	11th to 20th	Day	18% 15% 3 7% 4 4 4 3 5% 6% 31%	1545
	21st to end	Day	19% 16% 5% 8% 4 6% 4 3 4 5% 26%	1520
December	1st to 10th	Day	21% 20% 6% 11% 6% 4 4 2 4 5% 17%	1520
	11th to 20th	Day	20% 20% 7% 10% 5% 3 3 2 4 6% 20%	1910
	21st to end	Day	25% 23% 7% 9% 5% 3 3 2 4 4 14%	2772
January	1st to 10th	Night	17% 21% 8% 12% 4 4 3 3 3 4 19%	4173
	11th to 20th	Night	17% 19% 7% 14% 7% 6% 5% 3 4 4 16%	4120
	21st to end	Night	28% 17% 7% 11% 5% 4 3 2 3 3 17%	4532
February	1st to 10th	Night	20% 15% 5% 10% 6% 5% 4 3 4 4 24%	2470
	11th to 20th	Night	19% 15% 4 12% 5% 4 4 3 4 5% 25%	2403
	21st to end	Night	21% 13% 4 11% 5% 4 4 3 5% 5% 26%	1885
March	1st to 10th	Night	23% 12% 3 7% 4 3 3 3 4 5% 33%	3418
	11th to 20th	Night	18% 14% 5% 7% 4 3 3 3 4 6% 34%	3480
	21st to end	Night	17% 10% 3 7% 5% 4 4 3 4 5% 39%	3817
April	1st to 10th	Night	18% 14% 3 6% 4 5% 3 3 3 5% 35%	1967
	11th to 20th	Night	16% 8% 2 8% 3 4 4 4 6% 6% 38%	1875
	21st to end	Night	16% 9% 3 8% 5% 5% 4 3 6% 7% 36%	1724
May	1st to 10th	Night	27% 9% 3 7% 4 4 4 3 5% 7% 27%	2813
	11th to 20th	Night	18% 9% 3 7% 5% 5% 4 3 5% 6% 34%	2812
	21st to end	Night	12% 7% 2 6% 4 4 4 5% 7% 9% 39%	2739
June	1st to 10th	Night	12% 6% 2 5% 5% 5% 5% 4 6% 8% 43%	1520
	11th to 20th	Night	10% 7% 2 7% 4 4 4 5% 7% 8% 41%	1520
	21st to end	Night	12% 6% 1 5% 5% 5% 5% 5% 7% 10% 40%	1520
July	1st to 10th	Night	12% 8% 3 8% 5% 4 5% 3 5% 8% 40%	2552
	11th to 20th	Night	11% 5% 3 6% 5% 4 6% 4 6% 10% 41%	2840
	21st to end	Night	12% 7% 3 8% 6% 4 5% 4 6% 7% 39%	3087
August	1st to 10th	Night	14% 9% 3 7% 4 5% 5% 4 6% 8% 35%	2825
	11th to 20th	Night	14% 7% 3 7% 4 4 4 3 5% 7% 41%	2785
	21st to end	Night	8% 5% 2 6% 5% 4 6% 5% 7% 9% 44%	3343
September	1st to 10th	Night	13% 6% 1 5% 3 3 5% 4 5% 7% 48%	1900
	11th to 20th	Night	9% 5% 2 5% 3 3 4 3 5% 7% 53%	2045
	21st to end	Night	17% 9% 3 6% 4 3 4 3 5% 6% 39%	2112
October	1st to 10th	Night	15% 6% 2 7% 4 4 4 4 5% 7% 43%	2280
	11th to 20th	Night	18% 6% 2 6% 5% 5% 4 3 5% 6% 39%	2280
	21st to end	Night	23% 8% 3 6% 4 3 4 2 4 6% 36%	2508
November	1st to 10th	Night	13% 10% 3 6% 4 3 4 3 5% 6% 43%	2310
	11th to 20th	Night	19% 12% 3 6% 6% 4 4 3 6% 6% 31%	2632
	21st to end	Night	19% 15% 4 6% 4 4 3 4 5% 6% 30%	2660
December	1st to 10th	Night	22% 17% 7% 10% 6% 4 3 3 4 4 20%	2660
	11th to 20th	Night	19% 17% 6% 10% 5% 4 3 3 4 5% 23%	3285
	21st to end	Night	25% 19% 6% 9% 5% 5% 4 3 5% 5% 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% 10% 18% 11% 2	2211
	11th to 20th	Day	51% 4 11% 17% 14% 2	2255
	21st to end	Day	51% 6% 10% 22% 10% 2	2470
May	1st to 10th	Day	55% 6% 10% 19% 8% 1	4120
	11th to 20th	Day	52% 8% 11% 20% 8% 1	4085
	21st to end	Day	39% 8% 16% 22% 12% 3	4828
June	1st to 10th	Day	45% 8% 13% 21% 11% 1	2660
	11th to 20th	Day	43% 8% 15% 21% 12% 1	2660
	21st to end	Day	43% 7% 12% 26% 11% 1	2660
July	1st to 10th	Day	40% 8% 11% 24% 14% 3	4321
	11th to 20th	Day	38% 8% 14% 26% 14%	4051
	21st to end	Day	45% 7% 10% 20% 18% 1	4324
August	1st to 10th	Day	50% 8% 13% 20% 8%	4091
	11th to 20th	Day	42% 8% 12% 27% 10% 1	4083
	21st to end	Day	36% 8% 13% 27% 14% 2	4281
September	1st to 10th	Day	41% 6% 10% 22% 19% 3	2280
	11th to 20th	Day	38% 6% 12% 27% 16% 1	2131
	21st to end	Day	49% 5% 10% 22% 14% 1	2067
October	1st to 10th	Day	34% 5% 11% 30% 19% 1	3160
	11th to 20th	Day	43% 7% 11% 21% 14% 5%	3140
	21st to end	Day	37% 4 11% 29% 18% 1	3428
November	1st to 10th	Day	44% 4 12% 21% 17% 3	1839
	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	1875
	21st to end	Night	47% 6% 9% 24% 11% 3	1724
May	1st to 10th	Night	57% 5% 8% 17% 10% 2	2840
	11th to 20th	Night	49% 8% 10% 22% 9% 2	2813
	21st to end	Night	38% 8% 15% 23% 11% 4	2746
June	1st to 10th	Night	38% 7% 13% 26% 15% 2	1520
	11th to 20th	Night	39% 7% 16% 24% 13% 2	1520
	21st to end	Night	38% 8% 13% 24% 17% 1	1520
July	1st to 10th	Night	43% 6% 9% 22% 16% 3	2511
	11th to 20th	Night	37% 7% 15% 24% 15% 1	2786
	21st to end	Night	43% 7% 11% 16% 22% 2	2988
August	1st to 10th	Night	47% 8% 12% 22% 10%	2814
	11th to 20th	Night	42% 5% 11% 29% 13% 1	2812
	21st to end	Night	33% 8% 13% 30% 13% 2	3343
September	1st to 10th	Night	34% 6% 11% 24% 20% 4	1900
	11th to 20th	Night	30% 5% 13% 28% 23% 1	2045
	21st to end	Night	45% 5% 11% 22% 16% 2	2112
October	1st to 10th	Night	37% 5% 9% 26% 22% 2	3800
	11th to 20th	Night	37% 5% 11% 25% 15% 8%	3779
	21st to end	Night	37% 3 10% 28% 21% 1	4120
November	1st to 10th	Night	42% 4 11% 22% 17% 4	2310
	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% 17% 7% 1	460
	11th to 20th	Day	25% 21% 29% 13% 9% 3	452
	21st to end	Day	30% 16% 28% 18% 5% 2	460
May	1st to 10th	Day	32% 14% 25% 17% 8% 3	463
	11th to 20th	Day	22% 13% 31% 19% 12% 4	487
	21st to end	Day	19% 5% 28% 27% 14% 7%	529
June	1st to 10th	Day	17% 11% 30% 26% 13% 4	490
	11th to 20th	Day	19% 12% 24% 26% 15% 4	490
	21st to end	Day	16% 10% 30% 29% 13% 3	490
July	1st to 10th	Day	13% 9% 19% 27% 21% 11%	485
	11th to 20th	Day	13% 7% 25% 29% 18% 7%	484
	21st to end	Day	16% 5% 25% 31% 17% 7%	532
August	1st to 10th	Day	13% 7% 22% 29% 20% 10%	486
	11th to 20th	Day	16% 6% 20% 28% 19% 10%	479
	21st to end	Day	12% 6% 24% 24% 23% 10%	539
September	1st to 10th	Day	19% 8% 19% 27% 17% 10%	490
	11th to 20th	Day	15% 3 19% 32% 21% 10%	490
	21st to end	Day	26% 11% 22% 23% 13% 6%	490
October	1st to 10th	Day	20% 9% 26% 22% 19% 4	490
	11th to 20th	Day	25% 15% 27% 22% 10% 2	490
	21st to end	Day	29% 15% 30% 16% 9% 1	539
November	1st to 10th	Day	19% 15% 31% 22% 10% 4	419
	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% 9% 1	751
	21st to end	Night	19% 11% 32% 31% 6% 1	584
May	1st to 10th	Night	23% 10% 24% 32% 9% 1	570
	11th to 20th	Night	21% 8% 25% 33% 12%	561
	21st to end	Night	11% 4 27% 32% 24% 3	419
June	1st to 10th	Night	11% 6% 24% 41% 17% 1	380
	11th to 20th	Night	12% 6% 22% 39% 19% 2	380
	21st to end	Night	13% 4 28% 35% 19% 1	380
July	1st to 10th	Night	10% 3 19% 42% 22% 4	388
	11th to 20th	Night	11% 3 16% 38% 29% 4	552
	21st to end	Night	12% 3 15% 41% 26% 2	624
August	1st to 10th	Night	9% 5% 12% 43% 29% 2	567
	11th to 20th	Night	13% 4 13% 38% 29% 5%	564
	21st to end	Night	12% 4 16% 35% 28% 5%	755
September	1st to 10th	Night	15% 4 18% 34% 25% 3	760
	11th to 20th	Night	11% 4 16% 37% 28% 4	760
	21st to end	Night	20% 8% 22% 28% 19% 3	760
October	1st to 10th	Night	18% 7% 23% 28% 22% 2	760
	11th to 20th	Night	22% 11% 27% 29% 10% 1	760
	21st to end	Night	28% 12% 25% 26% 8%	836
November	1st to 10th	Night	18% 12% 26% 32% 11% 1	755
	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 2024-11-01 22:47:43. Version ac07

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