Lake Taghkanic State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Taghkanic State Park clear sky chart from 2005-11-06 to 2024-01-15.

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	16% 7% 3 6% 5% 3 5% 5% 5% 7% 37%	74786
	Night	17% 8% 3 6% 5% 3 4 4 5% 7% 37%	74983
Transparency	Day	45% 7% 12% 21% 12% 2	74491
	Night	46% 7% 12% 21% 13% 2	74812
Seeing	Day	22% 17% 30% 21% 9% 2	13772
	Night	21% 14% 32% 25% 7% 1	22967

By Month

Percentage Cloud Cover NE (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% 11% 3 6% 6% 4 4 5% 7% 7% 34%	1517
	11th to 20th	Day	16% 10% 4 6% 6% 3 6% 6% 6% 7% 30%	1472
	21st to end	Day	11% 8% 4 7% 6% 5% 5% 5% 5% 8% 35%	1656
February	1st to 10th	Day	16% 11% 4 6% 8% 3 6% 6% 5% 6% 28%	1620
	11th to 20th	Day	14% 9% 3 8% 7% 3 5% 5% 5% 6% 35%	1744
	21st to end	Day	19% 10% 3 6% 6% 4 5% 5% 5% 4 34%	1480
March	1st to 10th	Day	14% 9% 4 7% 7% 3 4 4 5% 7% 36%	1797
	11th to 20th	Day	17% 8% 4 6% 6% 3 4 5% 4 7% 36%	1870
	21st to end	Day	19% 10% 3 5% 5% 3 4 4 5% 5% 38%	2371
April	1st to 10th	Day	19% 9% 4 6% 4 3 4 4 6% 6% 36%	2160
	11th to 20th	Day	16% 6% 3 6% 4 3 5% 5% 6% 6% 41%	2134
	21st to end	Day	20% 7% 3 5% 5% 3 5% 5% 4 6% 37%	2230
May	1st to 10th	Day	21% 8% 3 6% 5% 3 5% 4 5% 7% 33%	2350
	11th to 20th	Day	19% 5% 3 5% 5% 3 4 5% 5% 8% 39%	2478
	21st to end	Day	14% 6% 2 4 6% 3 5% 5% 7% 9% 40%	2725
June	1st to 10th	Day	17% 6% 3 5% 5% 4 6% 6% 6% 9% 34%	2520
	11th to 20th	Day	15% 6% 2 5% 6% 3 6% 6% 6% 10% 35%	2520
	21st to end	Day	14% 6% 3 6% 6% 4 6% 5% 6% 9% 35%	2520
July	1st to 10th	Day	11% 5% 3 6% 6% 4 6% 5% 6% 8% 40%	2520
	11th to 20th	Day	11% 5% 2 6% 6% 3 5% 6% 7% 10% 41%	2520
	21st to end	Day	11% 5% 3 5% 6% 3 5% 6% 7% 9% 39%	2744
August	1st to 10th	Day	10% 5% 2 6% 6% 4 6% 6% 7% 9% 41%	2462
	11th to 20th	Day	11% 7% 3 5% 5% 4 6% 5% 8% 9% 37%	2126
	21st to end	Day	12% 5% 2 4 5% 3 5% 5% 5% 9% 43%	2376
September	1st to 10th	Day	13% 6% 3 5% 6% 3 5% 5% 5% 8% 42%	2160
	11th to 20th	Day	12% 5% 2 5% 5% 3 4 4 4 7% 48%	2072
	21st to end	Day	16% 4 3 4 4 2 4 5% 7% 8% 43%	1980
October	1st to 10th	Day	21% 6% 3 5% 5% 4 4 4 4 6% 39%	1890
	11th to 20th	Day	15% 7% 2 6% 5% 3 4 4 4 7% 42%	1800
	21st to end	Day	23% 8% 3 5% 5% 3 5% 5% 5% 5% 32%	1797
November	1st to 10th	Day	14% 8% 2 5% 4 3 4 3 4 7% 47%	1671
	11th to 20th	Day	17% 7% 4 6% 5% 4 4 4 5% 5% 38%	1710
	21st to end	Day	18% 9% 3 5% 5% 2 4 6% 5% 7% 37%	1596
December	1st to 10th	Day	18% 10% 4 8% 6% 3 5% 5% 5% 6% 29%	1520
	11th to 20th	Day	25% 7% 3 5% 5% 2 4 4 5% 5% 36%	1906
	21st to end	Day	23% 13% 4 8% 6% 3 4 4 4 6% 24%	2772
January	1st to 10th	Night	16% 10% 3 7% 6% 4 4 4 4 6% 37%	2649
	11th to 20th	Night	18% 11% 4 8% 6% 3 5% 4 6% 6% 29%	2583
	21st to end	Night	13% 10% 3 8% 6% 4 5% 5% 6% 6% 35%	2697
February	1st to 10th	Night	17% 10% 4 7% 6% 4 6% 5% 5% 6% 31%	2340
	11th to 20th	Night	14% 10% 5% 7% 6% 4 5% 5% 6% 6% 32%	2102
	21st to end	Night	18% 9% 4 5% 6% 4 5% 5% 4 6% 34%	1776
March	1st to 10th	Night	16% 9% 3 7% 6% 3 5% 4 4 7% 37%	2150
	11th to 20th	Night	17% 9% 3 6% 5% 4 6% 5% 5% 6% 35%	2087
	21st to end	Night	19% 7% 3 8% 5% 3 4 4 4 6% 39%	1984
April	1st to 10th	Night	17% 9% 4 8% 6% 4 4 5% 5% 7% 32%	1800
	11th to 20th	Night	20% 8% 3 4 6% 3 4 4 4 6% 38%	1775
	21st to end	Night	23% 7% 3 5% 4 2 4 4 4 7% 37%	1728
May	1st to 10th	Night	22% 9% 4 7% 5% 3 4 4 5% 5% 33%	1620
	11th to 20th	Night	17% 8% 3 5% 6% 3 4 3 6% 6% 39%	1420
	21st to end	Night	14% 6% 2 5% 5% 3 5% 6% 6% 7% 41%	1550
June	1st to 10th	Night	17% 6% 2 5% 5% 3 4 6% 5% 8% 40%	1440
	11th to 20th	Night	15% 6% 3 5% 5% 3 5% 5% 6% 8% 40%	1440
	21st to end	Night	13% 5% 1 5% 5% 4 5% 6% 6% 8% 43%	1440
July	1st to 10th	Night	14% 4 2 4 4 2 5% 5% 6% 8% 46%	1440
	11th to 20th	Night	12% 4 1 7% 6% 4 5% 5% 7% 10% 39%	1440
	21st to end	Night	11% 5% 2 5% 5% 4 6% 5% 5% 8% 43%	1574
August	1st to 10th	Night	9% 5% 2 6% 5% 3 5% 6% 6% 9% 44%	1454
	11th to 20th	Night	11% 6% 3 6% 5% 4 6% 6% 7% 9% 38%	1774
	21st to end	Night	15% 5% 3 5% 5% 3 4 5% 5% 8% 44%	1980
September	1st to 10th	Night	14% 6% 3 4 5% 3 5% 5% 5% 7% 42%	1800
	11th to 20th	Night	14% 4 2 4 4 2 4 3 3 6% 53%	1886
	21st to end	Night	14% 6% 2 5% 5% 2 4 5% 5% 5% 46%	1980
October	1st to 10th	Night	20% 7% 2 6% 5% 2 4 4 5% 6% 39%	2066
	11th to 20th	Night	15% 7% 3 6% 5% 3 4 4 5% 8% 41%	2160
	21st to end	Night	24% 7% 3 6% 5% 3 4 3 4 6% 34%	2557
November	1st to 10th	Night	15% 8% 3 5% 5% 2 4 4 4 7% 45%	2407
	11th to 20th	Night	19% 7% 3 6% 5% 3 3 4 4 6% 39%	2470
	21st to end	Night	16% 8% 2 6% 5% 3 5% 4 5% 7% 39%	2582
December	1st to 10th	Night	21% 9% 3 5% 5% 2 5% 4 5% 6% 33%	2660
	11th to 20th	Night	21% 10% 3 6% 5% 3 4 5% 5% 6% 32%	3288
	21st to end	Night	23% 12% 5% 7% 6% 3 4 4 5% 6% 26%	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	47% 6% 14% 22% 10% 1	1518
	11th to 20th	Day	52% 8% 14% 17% 8% 1	1472
	21st to end	Day	46% 7% 13% 21% 11% 2	1656
February	1st to 10th	Day	55% 6% 12% 16% 10% 1	1620
	11th to 20th	Day	48% 6% 10% 22% 11% 2	1753
	21st to end	Day	52% 5% 10% 18% 12% 2	1480
March	1st to 10th	Day	47% 6% 13% 20% 12% 3	1800
	11th to 20th	Day	49% 5% 11% 20% 13% 2	1870
	21st to end	Day	50% 5% 8% 17% 16% 5%	2371
April	1st to 10th	Day	49% 6% 10% 20% 13% 3	2160
	11th to 20th	Day	44% 6% 10% 22% 16% 2	2134
	21st to end	Day	47% 6% 10% 20% 13% 4	2230
May	1st to 10th	Day	52% 7% 9% 19% 12% 2	2350
	11th to 20th	Day	43% 7% 10% 22% 16% 2	2482
	21st to end	Day	41% 9% 15% 22% 12% 2	2725
June	1st to 10th	Day	45% 9% 14% 20% 11% 1	2520
	11th to 20th	Day	43% 9% 14% 22% 11% 1	2520
	21st to end	Day	44% 8% 14% 23% 10% 1	2520
July	1st to 10th	Day	41% 9% 13% 21% 15% 1	2450
	11th to 20th	Day	37% 9% 17% 24% 13%	2445
	21st to end	Day	39% 11% 15% 20% 14% 2	2591
August	1st to 10th	Day	37% 11% 15% 24% 12% 1	2448
	11th to 20th	Day	40% 11% 16% 23% 9% 1	2126
	21st to end	Day	37% 8% 14% 25% 15% 1	2376
September	1st to 10th	Day	41% 8% 12% 23% 14% 2	2160
	11th to 20th	Day	35% 7% 11% 24% 22% 2	2072
	21st to end	Day	38% 8% 12% 23% 16% 2	1980
October	1st to 10th	Day	47% 6% 10% 22% 14% 2	1890
	11th to 20th	Day	42% 7% 12% 26% 11% 1	1800
	21st to end	Day	53% 6% 11% 17% 11% 2	1797
November	1st to 10th	Day	39% 6% 14% 25% 14% 2	1671
	11th to 20th	Day	45% 6% 12% 20% 16% 2	1710
	21st to end	Day	45% 7% 14% 23% 9% 2	1596
December	1st to 10th	Day	54% 7% 14% 15% 9%	1520
	11th to 20th	Day	49% 7% 16% 19% 8% 1	1906
	21st to end	Day	59% 7% 11% 17% 6%	2772
January	1st to 10th	Night	47% 6% 12% 21% 13% 2	2649
	11th to 20th	Night	55% 6% 14% 17% 7% 1	2583
	21st to end	Night	47% 5% 12% 20% 13% 2	2697
February	1st to 10th	Night	53% 6% 13% 17% 9% 2	2340
	11th to 20th	Night	51% 6% 11% 18% 12% 2	2104
	21st to end	Night	50% 6% 10% 21% 11% 3	1776
March	1st to 10th	Night	46% 7% 11% 22% 12% 2	2160
	11th to 20th	Night	49% 6% 12% 20% 12% 2	2088
	21st to end	Night	47% 5% 9% 19% 17% 3	1984
April	1st to 10th	Night	52% 5% 9% 19% 12% 2	1800
	11th to 20th	Night	47% 5% 11% 19% 17% 1	1775
	21st to end	Night	47% 6% 9% 20% 14% 3	1728
May	1st to 10th	Night	53% 6% 9% 17% 12% 3	1620
	11th to 20th	Night	45% 7% 10% 21% 15% 2	1421
	21st to end	Night	41% 9% 17% 20% 13% 1	1551
June	1st to 10th	Night	42% 8% 11% 25% 12% 2	1440
	11th to 20th	Night	42% 9% 15% 24% 10%	1440
	21st to end	Night	36% 10% 13% 27% 14% 1	1440
July	1st to 10th	Night	35% 9% 14% 25% 15% 2	1400
	11th to 20th	Night	37% 10% 16% 26% 10%	1392
	21st to end	Night	37% 9% 15% 22% 15% 3	1486
August	1st to 10th	Night	33% 10% 16% 27% 13% 1	1444
	11th to 20th	Night	41% 9% 16% 24% 10%	1774
	21st to end	Night	38% 8% 11% 26% 17% 1	1980
September	1st to 10th	Night	40% 7% 12% 26% 15% 1	1800
	11th to 20th	Night	32% 6% 11% 26% 24% 1	1886
	21st to end	Night	37% 7% 10% 24% 20% 1	1980
October	1st to 10th	Night	47% 5% 11% 21% 14% 1	2066
	11th to 20th	Night	41% 7% 14% 24% 13% 1	2160
	21st to end	Night	52% 5% 11% 19% 11% 1	2557
November	1st to 10th	Night	40% 6% 12% 21% 18% 3	2407
	11th to 20th	Night	47% 4 12% 21% 13% 3	2470
	21st to end	Night	44% 6% 17% 24% 8% 1	2582
December	1st to 10th	Night	51% 8% 13% 18% 9%	2660
	11th to 20th	Night	51% 7% 14% 15% 12% 1	3288
	21st to end	Night	55% 7% 11% 19% 7%	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	26% 24% 33% 13% 4	180
	11th to 20th	Day	29% 30% 27% 11% 3	168
	21st to end	Day	22% 28% 35% 10% 4	208
February	1st to 10th	Day	35% 25% 32% 6% 2	240
	11th to 20th	Day	28% 28% 31% 12% 1	412
	21st to end	Day	29% 26% 33% 10% 2	346
March	1st to 10th	Day	25% 22% 35% 16% 1	420
	11th to 20th	Day	25% 25% 35% 12% 2 1	420
	21st to end	Day	35% 18% 28% 12% 5% 2	462
April	1st to 10th	Day	31% 22% 26% 14% 6% 1	420
	11th to 20th	Day	25% 26% 26% 16% 6% 1	412
	21st to end	Day	29% 20% 32% 13% 4 1	420
May	1st to 10th	Day	30% 20% 27% 15% 7% 1	423
	11th to 20th	Day	23% 16% 36% 19% 4 2	447
	21st to end	Day	20% 12% 27% 26% 13% 2	485
June	1st to 10th	Day	20% 11% 33% 22% 13% 1	450
	11th to 20th	Day	17% 14% 30% 28% 10% 2	450
	21st to end	Day	16% 13% 32% 25% 13% 2	450
July	1st to 10th	Day	11% 9% 32% 30% 16% 3	445
	11th to 20th	Day	11% 7% 30% 32% 18% 2	444
	21st to end	Day	11% 10% 33% 31% 13% 2	488
August	1st to 10th	Day	11% 7% 29% 35% 13% 5%	446
	11th to 20th	Day	15% 6% 29% 28% 16% 7%	439
	21st to end	Day	12% 10% 27% 31% 14% 6%	495
September	1st to 10th	Day	18% 10% 23% 28% 16% 6%	450
	11th to 20th	Day	14% 11% 31% 20% 14% 10%	450
	21st to end	Day	20% 11% 30% 23% 12% 5%	450
October	1st to 10th	Day	24% 13% 24% 21% 13% 4	450
	11th to 20th	Day	17% 15% 37% 21% 8% 1	450
	21st to end	Day	27% 17% 29% 21% 6% 1	403
November	1st to 10th	Day	21% 18% 29% 21% 10% 1	365
	11th to 20th	Day	24% 25% 28% 18% 5% 1	370
	21st to end	Day	25% 21% 29% 23% 1	256
December	1st to 10th	Day	22% 27% 33% 12% 6%	180
	11th to 20th	Day	32% 25% 30% 12% 2	180
	21st to end	Day	25% 25% 33% 14% 4	198
January	1st to 10th	Night	22% 17% 40% 19% 2	760
	11th to 20th	Night	25% 21% 33% 20% 1	739
	21st to end	Night	19% 21% 39% 20% 2	792
February	1st to 10th	Night	23% 19% 37% 20% 2	720
	11th to 20th	Night	23% 20% 41% 16%	703
	21st to end	Night	27% 19% 37% 15% 2	592
March	1st to 10th	Night	24% 21% 36% 16% 3	720
	11th to 20th	Night	26% 19% 37% 14% 3	720
	21st to end	Night	24% 22% 31% 17% 5%	792
April	1st to 10th	Night	24% 22% 32% 19% 3	720
	11th to 20th	Night	24% 18% 33% 19% 6%	711
	21st to end	Night	26% 16% 33% 21% 4 1	648
May	1st to 10th	Night	24% 16% 31% 23% 6%	540
	11th to 20th	Night	19% 13% 38% 25% 4	359
	21st to end	Night	17% 9% 31% 33% 10% 1	389
June	1st to 10th	Night	17% 9% 31% 33% 10% 1	360
	11th to 20th	Night	16% 10% 29% 32% 13% 1	360
	21st to end	Night	12% 4 30% 41% 12%	360
July	1st to 10th	Night	15% 3 19% 44% 19% 1	350
	11th to 20th	Night	13% 5% 22% 43% 16% 1	348
	21st to end	Night	12% 4 24% 45% 14% 1	394
August	1st to 10th	Night	9% 4 25% 44% 16% 2	380
	11th to 20th	Night	15% 4 19% 41% 20% 2	710
	21st to end	Night	15% 5% 23% 37% 19% 2	792
September	1st to 10th	Night	17% 4 31% 32% 14% 2	720
	11th to 20th	Night	15% 8% 29% 27% 18% 4	720
	21st to end	Night	18% 8% 27% 33% 12% 2	720
October	1st to 10th	Night	24% 9% 26% 29% 11% 1	720
	11th to 20th	Night	18% 12% 33% 30% 7%	720
	21st to end	Night	27% 13% 33% 22% 5%	792
November	1st to 10th	Night	20% 14% 33% 25% 8%	740
	11th to 20th	Night	24% 13% 35% 21% 6% 1	760
	21st to end	Night	19% 17% 35% 23% 5% 1	760
December	1st to 10th	Night	26% 21% 31% 18% 5%	760
	11th to 20th	Night	24% 18% 34% 22% 2	760
	21st to end	Night	27% 17% 38% 16% 2	836

Page generated at 2024-01-12 07:31:53. Version ac07

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