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 2024-01-13.

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	13% 6% 2 5% 5% 3 5% 5% 6% 8% 43%	74722
	Night	14% 6% 3 5% 5% 3 4 4 5% 7% 44%	75009
Transparency	Day	38% 6% 13% 24% 16% 3	74427
	Night	39% 6% 12% 23% 17% 3	74823
Seeing	Day	17% 11% 27% 25% 15% 5%	13946
	Night	17% 9% 30% 31% 13% 1	23418

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	13% 7% 3 5% 5% 3 5% 4 5% 6% 45%	1517
	11th to 20th	Day	16% 7% 3 5% 5% 3 4 4 5% 6% 44%	1562
	21st to end	Day	16% 7% 2 6% 4 3 4 4 4 6% 44%	1782
February	1st to 10th	Day	15% 7% 3 5% 4 3 5% 5% 6% 7% 39%	1620
	11th to 20th	Day	17% 6% 2 4 4 3 3 4 4 6% 45%	1715
	21st to end	Day	18% 9% 3 6% 5% 3 4 4 5% 6% 39%	1480
March	1st to 10th	Day	13% 6% 2 5% 4 2 3 4 4 6% 50%	1826
	11th to 20th	Day	17% 6% 2 5% 4 2 5% 4 5% 6% 44%	1980
	21st to end	Day	17% 6% 3 6% 6% 2 5% 4 5% 6% 40%	2286
April	1st to 10th	Day	12% 7% 3 5% 4 3 4 5% 6% 8% 45%	2160
	11th to 20th	Day	12% 5% 2 4 4 2 4 5% 6% 8% 48%	2134
	21st to end	Day	15% 5% 2 4 5% 3 4 5% 5% 8% 42%	2160
May	1st to 10th	Day	15% 6% 3 5% 4 3 4 4 6% 9% 41%	2224
	11th to 20th	Day	17% 7% 2 4 4 3 4 5% 7% 8% 39%	2478
	21st to end	Day	13% 5% 2 5% 5% 4 5% 5% 5% 9% 42%	2725
June	1st to 10th	Day	11% 4 3 5% 5% 3 6% 5% 7% 10% 41%	2520
	11th to 20th	Day	10% 5% 2 5% 6% 4 6% 5% 6% 9% 42%	2520
	21st to end	Day	10% 3 2 4 4 4 5% 6% 7% 11% 43%	2520
July	1st to 10th	Day	8% 5% 2 6% 6% 4 5% 7% 6% 9% 42%	2520
	11th to 20th	Day	5% 4 2 4 4 3 6% 6% 9% 13% 43%	2520
	21st to end	Day	9% 5% 2 5% 6% 4 7% 7% 8% 11% 36%	2622
August	1st to 10th	Day	9% 5% 2 6% 6% 4 5% 6% 9% 11% 36%	2319
	11th to 20th	Day	10% 5% 3 6% 6% 4 6% 6% 7% 9% 39%	2126
	21st to end	Day	9% 5% 2 6% 6% 4 5% 6% 6% 9% 41%	2376
September	1st to 10th	Day	14% 4 2 5% 5% 4 5% 5% 5% 8% 42%	2160
	11th to 20th	Day	11% 6% 2 5% 4 3 4 5% 5% 8% 48%	2142
	21st to end	Day	17% 7% 2 6% 4 3 5% 5% 4 7% 39%	1967
October	1st to 10th	Day	17% 5% 2 5% 4 2 4 4 5% 6% 45%	1800
	11th to 20th	Day	18% 5% 2 4 4 2 3 4 4 6% 50%	1800
	21st to end	Day	15% 6% 2 5% 4 2 3 4 4 6% 48%	1961
November	1st to 10th	Day	13% 5% 2 3 3 3 5% 4 5% 6% 52%	1671
	11th to 20th	Day	15% 4 2 4 4 2 3 4 5% 6% 49%	1710
	21st to end	Day	14% 4 3 5% 4 2 5% 4 5% 6% 48%	1617
December	1st to 10th	Day	16% 5% 3 5% 4 3 5% 5% 6% 6% 42%	1520
	11th to 20th	Day	16% 8% 3 5% 4 3 3 4 4 6% 45%	1910
	21st to end	Day	15% 7% 2 5% 5% 3 5% 4 6% 7% 41%	2772
January	1st to 10th	Night	16% 7% 2 4 4 3 3 4 5% 5% 46%	2649
	11th to 20th	Night	18% 7% 2 5% 5% 3 4 4 5% 6% 40%	2441
	21st to end	Night	15% 6% 3 5% 4 2 3 4 5% 6% 48%	2574
February	1st to 10th	Night	17% 7% 2 5% 4 4 4 5% 4 6% 41%	2340
	11th to 20th	Night	18% 8% 2 5% 4 3 4 4 4 5% 43%	2130
	21st to end	Night	18% 6% 2 5% 4 3 3 3 5% 5% 45%	1776
March	1st to 10th	Night	14% 6% 2 5% 4 2 4 4 5% 6% 49%	2129
	11th to 20th	Night	17% 6% 2 4 5% 3 5% 5% 5% 6% 43%	1980
	21st to end	Night	16% 8% 3 6% 5% 3 4 3 4 6% 41%	2068
April	1st to 10th	Night	16% 7% 3 5% 4 3 4 4 4 8% 42%	1800
	11th to 20th	Night	12% 5% 2 6% 5% 3 5% 4 5% 5% 47%	1775
	21st to end	Night	18% 5% 2 4 4 3 5% 4 5% 7% 44%	1800
May	1st to 10th	Night	14% 8% 3 6% 5% 4 4 5% 6% 8% 38%	1744
	11th to 20th	Night	15% 7% 3 5% 5% 3 5% 6% 6% 8% 36%	1419
	21st to end	Night	11% 8% 3 5% 5% 3 6% 4 5% 10% 39%	1550
June	1st to 10th	Night	12% 5% 3 5% 4 3 4 4 6% 9% 44%	1440
	11th to 20th	Night	9% 5% 2 6% 6% 3 5% 7% 5% 10% 40%	1440
	21st to end	Night	9% 4 3 4 6% 4 6% 6% 7% 10% 41%	1440
July	1st to 10th	Night	8% 6% 3 6% 6% 4 5% 6% 6% 9% 42%	1440
	11th to 20th	Night	5% 4 2 5% 7% 3 6% 6% 8% 12% 43%	1440
	21st to end	Night	7% 4 2 5% 6% 4 6% 6% 7% 10% 42%	1692
August	1st to 10th	Night	7% 5% 3 6% 5% 4 6% 7% 7% 10% 40%	1611
	11th to 20th	Night	8% 5% 2 5% 7% 3 6% 6% 7% 9% 41%	1765
	21st to end	Night	9% 7% 2 5% 5% 3 4 5% 7% 9% 44%	1980
September	1st to 10th	Night	14% 6% 2 5% 6% 2 4 4 5% 7% 45%	1800
	11th to 20th	Night	10% 5% 3 4 5% 2 3 5% 5% 8% 51%	1818
	21st to end	Night	18% 7% 2 4 4 3 4 4 6% 6% 40%	1988
October	1st to 10th	Night	16% 8% 3 5% 4 2 4 4 4 6% 45%	2160
	11th to 20th	Night	18% 5% 1 4 4 2 3 3 4 5% 51%	2160
	21st to end	Night	15% 7% 2 4 4 2 3 5% 4 6% 48%	2394
November	1st to 10th	Night	11% 6% 2 4 5% 2 4 3 5% 5% 53%	2407
	11th to 20th	Night	15% 6% 3 5% 4 2 4 3 4 5% 49%	2470
	21st to end	Night	12% 6% 2 3 4 3 4 4 5% 7% 48%	2560
December	1st to 10th	Night	18% 7% 3 5% 4 3 4 4 5% 7% 41%	2660
	11th to 20th	Night	17% 5% 2 5% 4 3 4 4 5% 8% 44%	3285
	21st to end	Night	14% 8% 3 6% 5% 3 4 5% 5% 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	39% 6% 12% 23% 16% 5%	1518
	11th to 20th	Day	41% 5% 14% 22% 15% 3	1562
	21st to end	Day	41% 4 10% 26% 15% 4	1782
February	1st to 10th	Day	42% 6% 14% 25% 12% 2	1620
	11th to 20th	Day	41% 4 10% 25% 16% 3	1724
	21st to end	Day	46% 4 11% 20% 15% 4	1480
March	1st to 10th	Day	36% 5% 11% 27% 19% 3	1826
	11th to 20th	Day	40% 6% 9% 21% 19% 5%	1980
	21st to end	Day	45% 5% 8% 21% 17% 4	2286
April	1st to 10th	Day	36% 6% 13% 22% 17% 6%	2160
	11th to 20th	Day	34% 6% 11% 24% 19% 6%	2134
	21st to end	Day	39% 6% 13% 19% 18% 5%	2160
May	1st to 10th	Day	38% 7% 13% 22% 17% 3	2224
	11th to 20th	Day	41% 8% 15% 20% 14% 2	2482
	21st to end	Day	39% 7% 14% 26% 13% 1	2725
June	1st to 10th	Day	37% 8% 16% 23% 15% 2	2520
	11th to 20th	Day	37% 9% 14% 22% 15% 2	2520
	21st to end	Day	32% 9% 15% 25% 19% 1	2520
July	1st to 10th	Day	37% 9% 13% 23% 16% 3	2450
	11th to 20th	Day	29% 8% 18% 29% 13% 3	2445
	21st to end	Day	38% 10% 15% 21% 15% 2	2475
August	1st to 10th	Day	37% 9% 15% 26% 12% 1	2306
	11th to 20th	Day	39% 8% 16% 21% 14% 2	2126
	21st to end	Day	37% 8% 14% 22% 15% 4	2376
September	1st to 10th	Day	39% 7% 13% 20% 17% 3	2160
	11th to 20th	Day	35% 5% 11% 24% 24% 3	2142
	21st to end	Day	45% 5% 8% 20% 19% 3	1967
October	1st to 10th	Day	39% 6% 13% 23% 17% 3	1800
	11th to 20th	Day	35% 5% 9% 26% 22% 3	1800
	21st to end	Day	38% 4 7% 28% 20% 3	1961
November	1st to 10th	Day	33% 5% 11% 29% 19% 4	1671
	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	40% 4 10% 22% 19% 4	2649
	11th to 20th	Night	44% 5% 11% 24% 15% 1	2441
	21st to end	Night	38% 4 9% 27% 19% 3	2574
February	1st to 10th	Night	43% 4 13% 23% 14% 2	2340
	11th to 20th	Night	44% 4 8% 21% 18% 5%	2132
	21st to end	Night	42% 4 10% 23% 18% 4	1776
March	1st to 10th	Night	37% 4 11% 26% 20% 3	2129
	11th to 20th	Night	42% 6% 10% 20% 19% 4	1980
	21st to end	Night	45% 4 9% 18% 18% 6%	2068
April	1st to 10th	Night	42% 4 10% 19% 20% 5%	1800
	11th to 20th	Night	39% 5% 11% 19% 20% 6%	1775
	21st to end	Night	40% 5% 10% 21% 18% 5%	1800
May	1st to 10th	Night	44% 6% 11% 22% 14% 2	1744
	11th to 20th	Night	44% 8% 12% 16% 17% 2	1420
	21st to end	Night	42% 9% 14% 20% 13% 2	1551
June	1st to 10th	Night	38% 7% 13% 23% 18% 2	1440
	11th to 20th	Night	37% 9% 16% 23% 13% 2	1440
	21st to end	Night	34% 9% 17% 22% 16% 2	1440
July	1st to 10th	Night	38% 9% 17% 20% 14% 3	1400
	11th to 20th	Night	33% 9% 18% 26% 12% 3	1392
	21st to end	Night	33% 9% 15% 27% 15% 1	1598
August	1st to 10th	Night	36% 9% 18% 22% 14%	1600
	11th to 20th	Night	37% 9% 17% 21% 15% 1	1765
	21st to end	Night	36% 8% 16% 21% 16% 3	1980
September	1st to 10th	Night	40% 5% 12% 23% 16% 4	1800
	11th to 20th	Night	30% 6% 11% 25% 23% 4	1818
	21st to end	Night	43% 6% 8% 22% 18% 3	1988
October	1st to 10th	Night	42% 5% 10% 21% 19% 3	2160
	11th to 20th	Night	36% 4 10% 27% 20% 3	2160
	21st to end	Night	38% 5% 9% 25% 20% 3	2394
November	1st to 10th	Night	34% 5% 10% 27% 19% 6%	2407
	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	21% 27% 30% 17% 5%	212
	21st to end	Day	20% 22% 39% 13% 6% 1	264
February	1st to 10th	Day	24% 22% 36% 14% 4	240
	11th to 20th	Day	25% 19% 43% 11% 2	383
	21st to end	Day	23% 21% 37% 15% 3	346
March	1st to 10th	Day	19% 22% 34% 21% 4	420
	11th to 20th	Day	21% 20% 34% 19% 5% 2	420
	21st to end	Day	24% 15% 31% 23% 6% 1	462
April	1st to 10th	Day	17% 20% 38% 18% 5% 2	420
	11th to 20th	Day	15% 14% 35% 24% 11% 1	412
	21st to end	Day	23% 14% 32% 22% 9% 1	420
May	1st to 10th	Day	22% 14% 32% 22% 8% 3	423
	11th to 20th	Day	19% 10% 32% 27% 12% 1	447
	21st to end	Day	18% 4 22% 28% 21% 7%	485
June	1st to 10th	Day	13% 4 27% 30% 20% 5%	450
	11th to 20th	Day	13% 5% 25% 32% 17% 7%	450
	21st to end	Day	12% 3 20% 35% 24% 6%	450
July	1st to 10th	Day	10% 3 16% 34% 27% 11%	445
	11th to 20th	Day	3 2 16% 35% 33% 11%	444
	21st to end	Day	10% 3 18% 33% 28% 9%	488
August	1st to 10th	Day	11% 3 15% 33% 26% 11%	446
	11th to 20th	Day	11% 3 15% 28% 32% 10%	439
	21st to end	Day	9% 5% 16% 32% 25% 13%	495
September	1st to 10th	Day	16% 5% 18% 27% 20% 14%	450
	11th to 20th	Day	12% 6% 20% 27% 24% 11%	450
	21st to end	Day	22% 8% 24% 29% 13% 5%	450
October	1st to 10th	Day	21% 6% 22% 26% 18% 8%	450
	11th to 20th	Day	18% 10% 25% 25% 18% 4	450
	21st to end	Day	18% 11% 33% 27% 8% 3	485
November	1st to 10th	Day	16% 12% 30% 23% 15% 5%	365
	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% 14% 33% 27% 5%	729
	21st to end	Night	18% 15% 40% 25% 3	792
February	1st to 10th	Night	20% 13% 39% 25% 3	720
	11th to 20th	Night	23% 17% 38% 21% 1	703
	21st to end	Night	21% 19% 36% 21% 3	592
March	1st to 10th	Night	19% 13% 40% 24% 4	720
	11th to 20th	Night	21% 14% 38% 20% 7% 1	720
	21st to end	Night	21% 8% 42% 23% 6% 1	792
April	1st to 10th	Night	21% 13% 40% 19% 6%	720
	11th to 20th	Night	14% 10% 35% 35% 6%	711
	21st to end	Night	20% 8% 35% 29% 8%	720
May	1st to 10th	Night	19% 8% 33% 30% 10%	664
	11th to 20th	Night	18% 5% 32% 36% 9% 1	358
	21st to end	Night	14% 4 20% 41% 20% 2	389
June	1st to 10th	Night	14% 2 24% 42% 17% 1	360
	11th to 20th	Night	9% 2 24% 43% 20% 1	360
	21st to end	Night	11% 2 20% 50% 17% 1	360
July	1st to 10th	Night	10% 3 18% 45% 23% 1	350
	11th to 20th	Night	7% 2 12% 46% 31% 2	348
	21st to end	Night	6% 1 17% 45% 29% 2	512
August	1st to 10th	Night	10% 2 11% 46% 28% 2	537
	11th to 20th	Night	10% 2 13% 42% 29% 3	701
	21st to end	Night	12% 3 14% 38% 29% 5%	792
September	1st to 10th	Night	18% 2 14% 37% 25% 4	720
	11th to 20th	Night	13% 2 16% 38% 28% 4	720
	21st to end	Night	22% 4 19% 35% 19% 1	720
October	1st to 10th	Night	21% 5% 20% 32% 19% 5%	720
	11th to 20th	Night	20% 7% 26% 30% 16% 1	720
	21st to end	Night	19% 8% 33% 27% 12% 1	792
November	1st to 10th	Night	14% 8% 33% 29% 13% 2	740
	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

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