Killen's Pond State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Killen's Pond State Park clear sky chart from 2005-11-06 to 2024-11-10.

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	14% 6% 2 6% 4 4 4 4 6% 8% 42%	101254
	Night	15% 7% 2 6% 4 4 4 3 5% 7% 43%	97840
Transparency	Day	38% 6% 13% 24% 16% 3	104858
	Night	39% 5% 12% 23% 17% 3	102363
Seeing	Day	17% 11% 27% 26% 15% 5%	15110
	Night	17% 9% 30% 31% 12% 1	24457

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	15% 6% 2 5% 3 3 3 3 5% 6% 49%	2517
	11th to 20th	Day	16% 8% 3 7% 5% 4 4 3 4 5% 41%	2710
	21st to end	Day	18% 9% 3 7% 3 4 4 3 5% 5% 38%	3124
February	1st to 10th	Day	14% 7% 2 6% 4 5% 4 4 6% 7% 41%	1710
	11th to 20th	Day	17% 7% 2 5% 4 3 3 4 5% 6% 44%	1813
	21st to end	Day	17% 10% 3 6% 4 3 4 3 5% 6% 39%	1570
March	1st to 10th	Day	24% 7% 2 5% 3 3 3 3 4 6% 40%	3173
	11th to 20th	Day	10% 4 1 4 3 3 5% 3 7% 8% 52%	3480
	21st to end	Day	19% 8% 2 6% 4 3 3 3 4 6% 42%	4020
April	1st to 10th	Day	13% 8% 2 5% 4 4 4 4 6% 7% 44%	2280
	11th to 20th	Day	12% 6% 2 4 4 4 4 4 6% 7% 47%	2254
	21st to end	Day	15% 6% 2 5% 4 4 4 4 6% 8% 43%	2280
May	1st to 10th	Day	23% 8% 3 7% 4 3 4 4 6% 7% 30%	3885
	11th to 20th	Day	22% 9% 3 6% 4 4 4 4 5% 7% 31%	4398
	21st to end	Day	11% 5% 2 6% 4 4 5% 4 6% 9% 44%	4823
June	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 4 8% 9% 41%	2660
	11th to 20th	Day	10% 5% 2 6% 5% 5% 5% 4 6% 10% 43%	2660
	21st to end	Day	10% 4 2 5% 4 5% 5% 5% 7% 11% 43%	2660
July	1st to 10th	Day	6% 4 1 6% 5% 6% 7% 6% 9% 11% 40%	4440
	11th to 20th	Day	11% 5% 2 5% 4 5% 5% 5% 9% 11% 37%	4440
	21st to end	Day	10% 6% 2 8% 6% 6% 7% 5% 8% 10% 32%	4597
August	1st to 10th	Day	16% 6% 2 6% 5% 4 5% 5% 8% 11% 32%	4083
	11th to 20th	Day	9% 5% 3 7% 5% 5% 6% 5% 7% 10% 41%	3730
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 6% 9% 47%	4180
September	1st to 10th	Day	13% 5% 2 6% 4 5% 5% 4 5% 7% 43%	2280
	11th to 20th	Day	11% 6% 2 5% 4 4 4 4 5% 7% 48%	2261
	21st to end	Day	18% 8% 2 7% 4 4 4 4 5% 7% 37%	2076
October	1st to 10th	Day	16% 5% 2 6% 3 3 5% 3 5% 6% 46%	1900
	11th to 20th	Day	17% 5% 2 4 3 2 3 3 4 6% 52%	1900
	21st to end	Day	14% 6% 2 5% 4 3 3 3 4 6% 50%	2069
November	1st to 10th	Day	12% 5% 2 4 3 4 5% 3 5% 7% 52%	1752
	11th to 20th	Day	14% 5% 1 5% 4 3 3 4 6% 6% 49%	1710
	21st to end	Day	14% 5% 3 6% 4 3 4 3 5% 6% 48%	1617
December	1st to 10th	Day	16% 6% 3 5% 4 4 5% 4 6% 6% 42%	1520
	11th to 20th	Day	16% 9% 3 6% 4 3 3 3 4 6% 45%	1910
	21st to end	Day	15% 7% 2 6% 4 4 4 4 6% 7% 41%	2772
January	1st to 10th	Night	15% 8% 3 5% 4 4 4 3 4 6% 44%	4429
	11th to 20th	Night	19% 7% 2 5% 3 4 3 3 4 5% 45%	4248
	21st to end	Night	20% 9% 3 6% 3 3 3 3 5% 5% 41%	4532
February	1st to 10th	Night	16% 7% 2 5% 4 4 4 4 4 6% 42%	2470
	11th to 20th	Night	18% 8% 2 6% 3 3 4 3 4 5% 43%	2252
	21st to end	Night	17% 7% 2 5% 3 3 3 3 6% 5% 44%	1884
March	1st to 10th	Night	21% 10% 3 6% 4 4 3 3 4 6% 38%	3675
	11th to 20th	Night	12% 5% 2 5% 4 4 5% 4 5% 7% 48%	3480
	21st to end	Night	16% 10% 3 7% 4 3 3 3 3 4 44%	3610
April	1st to 10th	Night	16% 8% 2 6% 4 4 3 3 4 8% 41%	1900
	11th to 20th	Night	12% 6% 2 7% 4 5% 4 4 5% 5% 46%	1875
	21st to end	Night	17% 5% 2 5% 4 4 4 3 5% 7% 44%	1900
May	1st to 10th	Night	18% 10% 3 9% 4 5% 4 3 5% 7% 31%	3018
	11th to 20th	Night	23% 9% 3 6% 4 4 4 4 6% 7% 30%	2499
	21st to end	Night	10% 6% 2 5% 4 4 5% 4 6% 10% 43%	2732
June	1st to 10th	Night	12% 6% 3 5% 5% 4 4 4 7% 8% 43%	1520
	11th to 20th	Night	9% 5% 2 7% 5% 4 5% 6% 6% 10% 41%	1520
	21st to end	Night	9% 5% 2 5% 5% 5% 6% 4 8% 10% 41%	1520
July	1st to 10th	Night	7% 5% 2 7% 5% 5% 5% 5% 7% 10% 40%	2520
	11th to 20th	Night	9% 6% 2 7% 6% 4 5% 4 7% 11% 39%	2520
	21st to end	Night	12% 8% 3 7% 6% 5% 5% 4 6% 8% 35%	2952
August	1st to 10th	Night	16% 8% 3 7% 4 4 5% 4 6% 11% 32%	2825
	11th to 20th	Night	10% 6% 3 7% 5% 5% 5% 4 7% 8% 40%	3088
	21st to end	Night	8% 6% 2 5% 3 4 4 4 6% 8% 52%	3476
September	1st to 10th	Night	14% 6% 2 6% 5% 4 4 3 5% 7% 45%	1900
	11th to 20th	Night	10% 5% 2 5% 3 3 3 3 6% 8% 51%	1919
	21st to end	Night	19% 7% 2 5% 3 4 4 4 6% 6% 39%	2099
October	1st to 10th	Night	16% 8% 3 5% 3 4 3 3 4 6% 46%	2280
	11th to 20th	Night	16% 5% 1 4 3 3 3 2 4 5% 53%	2280
	21st to end	Night	14% 7% 2 5% 3 3 3 4 4 6% 49%	2527
November	1st to 10th	Night	11% 6% 1 5% 4 3 4 3 5% 5% 53%	2531
	11th to 20th	Night	14% 7% 2 5% 3 4 3 3 4 5% 49%	2470
	21st to end	Night	12% 6% 2 4 4 4 4 3 5% 7% 48%	2560
December	1st to 10th	Night	17% 8% 3 6% 3 3 4 3 5% 7% 41%	2660
	11th to 20th	Night	17% 5% 2 5% 4 4 4 3 5% 8% 43%	3285
	21st to end	Night	14% 8% 3 7% 4 4 4 4 6% 8% 38%	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	36% 5% 9% 31% 15% 4	2518
	11th to 20th	Day	46% 5% 10% 21% 15% 4	2710
	21st to end	Day	47% 4 11% 23% 12% 2	3124
February	1st to 10th	Day	40% 6% 14% 25% 13% 2	1710
	11th to 20th	Day	40% 4 10% 25% 17% 3	1822
	21st to end	Day	46% 4 12% 19% 15% 4	1570
March	1st to 10th	Day	45% 5% 8% 25% 13% 4	3173
	11th to 20th	Day	28% 6% 9% 32% 20% 4	3480
	21st to end	Day	45% 4 9% 20% 19% 4	4020
April	1st to 10th	Day	37% 7% 13% 21% 16% 6%	2280
	11th to 20th	Day	35% 6% 12% 24% 18% 6%	2254
	21st to end	Day	38% 6% 13% 20% 19% 4	2280
May	1st to 10th	Day	51% 6% 12% 18% 11% 2	3920
	11th to 20th	Day	50% 8% 13% 19% 8% 1	4402
	21st to end	Day	34% 7% 13% 26% 18% 2	4837
June	1st to 10th	Day	36% 8% 15% 23% 15% 2	2660
	11th to 20th	Day	36% 8% 14% 24% 15% 2	2660
	21st to end	Day	32% 9% 15% 25% 18% 1	2660
July	1st to 10th	Day	35% 11% 20% 19% 12% 3	4370
	11th to 20th	Day	37% 8% 19% 25% 8% 2	4365
	21st to end	Day	43% 9% 14% 19% 13% 1	4450
August	1st to 10th	Day	42% 7% 18% 25% 7%	4070
	11th to 20th	Day	36% 7% 14% 28% 12% 1	3766
	21st to end	Day	32% 7% 13% 28% 17% 3	4180
September	1st to 10th	Day	39% 7% 13% 19% 19% 3	2280
	11th to 20th	Day	35% 5% 11% 24% 23% 2	2261
	21st to end	Day	47% 5% 8% 20% 18% 3	2076
October	1st to 10th	Day	33% 5% 9% 21% 26% 6%	3160
	11th to 20th	Day	25% 4 6% 27% 28% 10%	3140
	21st to end	Day	23% 3 9% 31% 25% 8%	3383
November	1st to 10th	Day	33% 5% 11% 29% 20% 3	1752
	11th to 20th	Day	35% 5% 11% 23% 23% 3	1710
	21st to end	Day	37% 4 10% 29% 17% 3	1617
December	1st to 10th	Day	41% 5% 15% 23% 13% 2	1520
	11th to 20th	Day	41% 4 9% 30% 12% 3	1906
	21st to end	Day	41% 6% 16% 23% 14% 1	2772
January	1st to 10th	Night	41% 5% 9% 26% 16% 4	4429
	11th to 20th	Night	42% 4 10% 25% 16% 3	4248
	21st to end	Night	45% 4 8% 27% 14% 2	4532
February	1st to 10th	Night	42% 4 13% 24% 14% 2	2470
	11th to 20th	Night	44% 4 8% 21% 19% 5%	2254
	21st to end	Night	41% 4 10% 23% 18% 4	1884
March	1st to 10th	Night	49% 3 10% 23% 13% 2	3675
	11th to 20th	Night	33% 6% 11% 28% 18% 4	3480
	21st to end	Night	44% 4 8% 17% 22% 5%	3610
April	1st to 10th	Night	42% 5% 10% 19% 20% 5%	1900
	11th to 20th	Night	39% 5% 11% 19% 19% 6%	1875
	21st to end	Night	40% 5% 10% 21% 18% 5%	1900
May	1st to 10th	Night	52% 5% 11% 21% 9% 1	3048
	11th to 20th	Night	53% 6% 14% 17% 10% 1	2500
	21st to end	Night	37% 8% 17% 19% 16% 3	2739
June	1st to 10th	Night	37% 7% 13% 23% 18% 2	1520
	11th to 20th	Night	36% 9% 15% 24% 14% 2	1520
	21st to end	Night	34% 8% 17% 23% 16% 3	1520
July	1st to 10th	Night	38% 9% 21% 19% 11% 2	2480
	11th to 20th	Night	38% 7% 21% 26% 7% 1	2472
	21st to end	Night	44% 8% 14% 20% 14%	2858
August	1st to 10th	Night	47% 7% 18% 20% 8%	2814
	11th to 20th	Night	38% 8% 15% 27% 12% 1	3118
	21st to end	Night	31% 6% 12% 28% 21% 2	3476
September	1st to 10th	Night	39% 5% 12% 22% 17% 4	1900
	11th to 20th	Night	31% 6% 11% 25% 23% 4	1919
	21st to end	Night	44% 6% 9% 21% 17% 3	2099
October	1st to 10th	Night	37% 6% 10% 22% 22% 4	3800
	11th to 20th	Night	24% 3 12% 22% 31% 8%	3779
	21st to end	Night	23% 3 11% 30% 26% 7%	4151
November	1st to 10th	Night	33% 5% 10% 26% 20% 6%	2531
	11th to 20th	Night	38% 4 10% 22% 21% 5%	2470
	21st to end	Night	35% 4 12% 26% 20% 3	2560
December	1st to 10th	Night	43% 4 12% 24% 13% 2	2660
	11th to 20th	Night	40% 4 12% 21% 19% 3	3288
	21st to end	Night	43% 6% 14% 25% 11% 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	21% 20% 34% 19% 6% 1	180
	11th to 20th	Day	25% 26% 29% 15% 4	234
	21st to end	Day	20% 21% 38% 14% 6% 1	297
February	1st to 10th	Day	21% 21% 36% 17% 4	270
	11th to 20th	Day	26% 20% 40% 12% 2	421
	21st to end	Day	23% 21% 35% 16% 4	382
March	1st to 10th	Day	22% 21% 32% 20% 5%	460
	11th to 20th	Day	20% 22% 34% 18% 5% 2	460
	21st to end	Day	24% 15% 33% 21% 6% 1	506
April	1st to 10th	Day	18% 20% 37% 17% 5% 2	460
	11th to 20th	Day	14% 15% 35% 23% 10% 1	452
	21st to end	Day	22% 14% 32% 22% 9% 1	460
May	1st to 10th	Day	22% 14% 32% 22% 7% 3	463
	11th to 20th	Day	19% 10% 32% 28% 11% 1	487
	21st to end	Day	16% 5% 23% 28% 21% 6%	529
June	1st to 10th	Day	12% 6% 28% 30% 19% 5%	490
	11th to 20th	Day	12% 5% 25% 33% 18% 8%	490
	21st to end	Day	11% 4 20% 37% 23% 5%	490
July	1st to 10th	Day	9% 3 15% 35% 27% 11%	485
	11th to 20th	Day	4 3 15% 37% 32% 10%	484
	21st to end	Day	10% 4 18% 34% 27% 8%	532
August	1st to 10th	Day	13% 3 16% 33% 25% 10%	486
	11th to 20th	Day	10% 3 16% 28% 32% 10%	479
	21st to end	Day	9% 5% 16% 32% 25% 14%	539
September	1st to 10th	Day	15% 5% 19% 28% 20% 13%	490
	11th to 20th	Day	11% 6% 21% 28% 24% 10%	490
	21st to end	Day	24% 8% 24% 28% 12% 4	490
October	1st to 10th	Day	20% 6% 23% 27% 17% 8%	490
	11th to 20th	Day	17% 11% 25% 25% 18% 5%	490
	21st to end	Day	16% 10% 32% 28% 10% 4	527
November	1st to 10th	Day	15% 11% 30% 25% 14% 4	392
	11th to 20th	Day	17% 17% 32% 22% 11% 1	370
	21st to end	Day	16% 17% 29% 26% 12% 1	277
December	1st to 10th	Day	15% 21% 37% 21% 4 1	180
	11th to 20th	Day	27% 17% 32% 18% 7%	180
	21st to end	Day	22% 16% 30% 25% 7%	198
January	1st to 10th	Night	19% 18% 38% 22% 4	760
	11th to 20th	Night	22% 15% 34% 25% 4	760
	21st to end	Night	18% 15% 40% 24% 3	836
February	1st to 10th	Night	19% 13% 38% 26% 3	760
	11th to 20th	Night	23% 17% 38% 20% 1	743
	21st to end	Night	21% 18% 35% 22% 3	628
March	1st to 10th	Night	19% 13% 40% 24% 4	760
	11th to 20th	Night	20% 15% 37% 20% 6% 1	760
	21st to end	Night	21% 9% 41% 23% 5%	836
April	1st to 10th	Night	20% 14% 40% 19% 6%	760
	11th to 20th	Night	14% 11% 35% 34% 6%	751
	21st to end	Night	19% 9% 35% 30% 8%	760
May	1st to 10th	Night	19% 8% 33% 30% 10%	700
	11th to 20th	Night	18% 5% 32% 36% 8% 1	378
	21st to end	Night	13% 3 22% 40% 20% 2	411
June	1st to 10th	Night	14% 3 24% 43% 16% 1	380
	11th to 20th	Night	9% 2 24% 43% 20% 1	380
	21st to end	Night	11% 2 21% 50% 16% 1	380
July	1st to 10th	Night	10% 3 17% 45% 24% 1	370
	11th to 20th	Night	7% 2 13% 46% 30% 2	368
	21st to end	Night	6% 2 17% 45% 28% 2	541
August	1st to 10th	Night	11% 2 11% 46% 27% 2	567
	11th to 20th	Night	10% 3 13% 42% 28% 3	741
	21st to end	Night	12% 3 13% 39% 29% 5%	836
September	1st to 10th	Night	17% 2 15% 38% 24% 4	760
	11th to 20th	Night	13% 2 15% 38% 28% 4	760
	21st to end	Night	23% 4 19% 34% 18% 1	760
October	1st to 10th	Night	20% 4 20% 32% 20% 4	760
	11th to 20th	Night	19% 7% 27% 30% 16% 1	760
	21st to end	Night	18% 8% 32% 29% 13% 1	836
November	1st to 10th	Night	14% 7% 34% 30% 13% 2	779
	11th to 20th	Night	18% 13% 31% 29% 9% 1	760
	21st to end	Night	14% 13% 35% 28% 10% 1	760
December	1st to 10th	Night	24% 12% 34% 19% 10% 1	760
	11th to 20th	Night	18% 12% 38% 26% 6%	760
	21st to end	Night	17% 12% 37% 30% 4	836

Page generated at 2024-11-07 06:55:50. Version ac07

Copyright © 2024 Attilla Danko.