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 2026-03-03.

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	15% 8% 3 7% 5% 4 5% 4 6% 7% 36%	130909
	Night	17% 9% 3 8% 5% 4 4 3 5% 6% 35%	130251
Transparency	Day	45% 7% 12% 21% 13% 2	134411
	Night	47% 6% 12% 20% 13% 2	134836
Seeing	Day	22% 17% 30% 20% 8% 2	16490
	Night	21% 15% 32% 25% 7% 1	25685

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	12% 10% 4 13% 5% 5% 5% 3 6% 6% 32%	4661
	11th to 20th	Day	13% 12% 4 9% 4 4 4 3 5% 6% 35%	4650
	21st to end	Day	13% 9% 3 7% 5% 5% 5% 4 5% 6% 38%	5364
February	1st to 10th	Day	14% 11% 3 7% 7% 5% 6% 5% 6% 5% 31%	1890
	11th to 20th	Day	13% 10% 3 9% 6% 5% 5% 4 5% 6% 34%	2043
	21st to end	Day	18% 10% 3 7% 5% 5% 4 3 5% 5% 35%	1730
March	1st to 10th	Day	22% 12% 4 7% 4 3 3 3 4 4 34%	4496
	11th to 20th	Day	12% 9% 3 8% 5% 4 4 3 5% 6% 39%	4702
	21st to end	Day	20% 10% 3 7% 4 4 4 3 4 5% 35%	5965
April	1st to 10th	Day	19% 11% 3 7% 4 4 4 3 6% 5% 35%	2400
	11th to 20th	Day	16% 8% 3 7% 4 4 4 3 6% 6% 39%	2374
	21st to end	Day	19% 7% 3 6% 5% 4 5% 4 4 6% 38%	2478
May	1st to 10th	Day	28% 9% 3 6% 4 3 4 4 6% 7% 26%	5924
	11th to 20th	Day	18% 8% 3 7% 5% 5% 4 3 5% 7% 34%	6318
	21st to end	Day	19% 8% 3 6% 4 4 5% 4 6% 8% 33%	6949
June	1st to 10th	Day	17% 6% 2 5% 5% 5% 5% 5% 6% 9% 34%	2800
	11th to 20th	Day	15% 6% 2 6% 5% 5% 5% 5% 7% 10% 34%	2800
	21st to end	Day	14% 7% 2 7% 5% 5% 5% 5% 5% 9% 35%	2800
July	1st to 10th	Day	9% 7% 3 8% 5% 6% 6% 4 7% 9% 35%	6360
	11th to 20th	Day	8% 6% 2 7% 6% 5% 6% 5% 9% 11% 35%	6360
	21st to end	Day	12% 7% 3 6% 5% 4 5% 4 6% 8% 41%	6926
August	1st to 10th	Day	15% 8% 2 8% 5% 5% 5% 4 6% 8% 32%	4460
	11th to 20th	Day	11% 7% 3 7% 4 5% 5% 4 7% 9% 40%	3850
	21st to end	Day	9% 5% 2 6% 5% 4 6% 5% 6% 9% 42%	4312
September	1st to 10th	Day	12% 7% 3 6% 5% 5% 4 4 5% 7% 44%	2400
	11th to 20th	Day	11% 5% 2 6% 4 5% 4 3 5% 7% 49%	2302
	21st to end	Day	16% 5% 3 5% 4 4 4 5% 7% 7% 40%	2200
October	1st to 10th	Day	19% 6% 2 5% 5% 5% 3 4 4 6% 41%	2100
	11th to 20th	Day	14% 7% 2 8% 4 4 4 3 4 7% 43%	2000
	21st to end	Day	21% 8% 2 6% 4 4 5% 4 5% 6% 35%	1996
November	1st to 10th	Day	13% 8% 2 7% 3 4 3 2 4 7% 46%	1851
	11th to 20th	Day	16% 9% 2 7% 4 5% 4 4 5% 6% 39%	1890
	21st to end	Day	18% 10% 3 5% 4 4 4 4 5% 7% 35%	1764
December	1st to 10th	Day	15% 11% 4 8% 4 4 4 4 6% 7% 33%	2680
	11th to 20th	Day	21% 9% 3 6% 4 3 3 3 5% 6% 38%	3066
	21st to end	Day	19% 12% 4 9% 5% 4 4 3 5% 7% 30%	4048
January	1st to 10th	Night	14% 11% 5% 13% 5% 5% 4 4 5% 5% 31%	8234
	11th to 20th	Night	13% 12% 5% 14% 7% 5% 5% 3 5% 5% 26%	8235
	21st to end	Night	15% 8% 3 9% 6% 5% 5% 3 5% 6% 34%	8800
February	1st to 10th	Night	15% 10% 4 7% 5% 5% 5% 4 6% 6% 34%	2730
	11th to 20th	Night	14% 11% 4 8% 5% 5% 5% 4 7% 6% 32%	2462
	21st to end	Night	17% 10% 3 6% 6% 5% 5% 4 4 6% 34%	2076
March	1st to 10th	Night	20% 9% 3 7% 5% 4 4 3 5% 6% 34%	5389
	11th to 20th	Night	17% 11% 4 7% 4 4 4 3 5% 5% 36%	5241
	21st to end	Night	19% 11% 4 9% 4 4 4 3 4 5% 34%	4966
April	1st to 10th	Night	18% 10% 3 8% 6% 5% 4 4 5% 6% 30%	2000
	11th to 20th	Night	20% 9% 3 5% 5% 4 4 3 4 6% 37%	1975
	21st to end	Night	21% 7% 3 6% 4 3 4 3 5% 6% 38%	1920
May	1st to 10th	Night	31% 9% 3 7% 3 3 4 3 4 6% 27%	4054
	11th to 20th	Night	20% 10% 3 8% 5% 4 4 4 5% 6% 31%	3580
	21st to end	Night	20% 8% 3 8% 4 4 5% 4 5% 7% 32%	3926
June	1st to 10th	Night	17% 7% 2 6% 4 3 5% 5% 5% 7% 39%	1600
	11th to 20th	Night	15% 7% 3 5% 5% 5% 4 4 6% 8% 39%	1600
	21st to end	Night	12% 5% 2 6% 5% 5% 5% 5% 6% 8% 42%	1600
July	1st to 10th	Night	11% 7% 3 7% 4 5% 5% 4 6% 8% 40%	3600
	11th to 20th	Night	11% 7% 3 8% 5% 6% 5% 4 8% 9% 34%	3600
	21st to end	Night	10% 7% 3 6% 4 4 4 3 5% 7% 47%	3926
August	1st to 10th	Night	20% 6% 3 7% 5% 5% 5% 5% 5% 7% 33%	2651
	11th to 20th	Night	13% 8% 3 7% 4 5% 5% 4 6% 8% 39%	3197
	21st to end	Night	10% 5% 3 6% 4 4 4 4 5% 8% 48%	3586
September	1st to 10th	Night	14% 7% 2 5% 4 5% 4 3 5% 7% 43%	2000
	11th to 20th	Night	13% 4 2 5% 3 3 4 2 4 7% 53%	2096
	21st to end	Night	15% 7% 2 6% 4 4 4 4 5% 6% 44%	2200
October	1st to 10th	Night	19% 7% 2 6% 4 4 4 3 5% 6% 41%	2296
	11th to 20th	Night	15% 7% 2 7% 4 3 4 3 5% 7% 43%	2400
	21st to end	Night	23% 7% 2 7% 4 4 3 3 5% 6% 36%	2842
November	1st to 10th	Night	15% 8% 3 6% 4 3 3 3 4 7% 45%	2667
	11th to 20th	Night	18% 8% 3 7% 4 4 4 3 4 6% 39%	2730
	21st to end	Night	16% 9% 2 7% 4 4 5% 3 6% 7% 37%	2854
December	1st to 10th	Night	19% 11% 3 6% 4 4 4 3 5% 6% 34%	4720
	11th to 20th	Night	24% 11% 3 6% 4 3 3 3 4 5% 35%	5348
	21st to end	Night	19% 13% 5% 9% 5% 4 4 3 5% 6% 29%	7150

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	52% 4 14% 21% 9% 1	4662
	11th to 20th	Day	48% 4 11% 18% 14% 4	4680
	21st to end	Day	44% 7% 11% 23% 15% 1	5364
February	1st to 10th	Day	52% 6% 11% 18% 12% 1	1890
	11th to 20th	Day	49% 6% 10% 22% 11% 2	2052
	21st to end	Day	50% 5% 11% 20% 12% 2	1730
March	1st to 10th	Day	53% 4 10% 16% 10% 7%	4499
	11th to 20th	Day	41% 9% 15% 24% 8% 4	4702
	21st to end	Day	49% 6% 7% 13% 20% 5%	5965
April	1st to 10th	Day	50% 6% 9% 20% 13% 3	2400
	11th to 20th	Day	45% 6% 11% 21% 16% 2	2374
	21st to end	Day	46% 6% 10% 20% 15% 3	2478
May	1st to 10th	Day	57% 7% 12% 14% 9% 1	5935
	11th to 20th	Day	48% 8% 12% 20% 11% 1	6322
	21st to end	Day	46% 8% 11% 23% 11% 1	6949
June	1st to 10th	Day	44% 9% 14% 21% 12% 1	2800
	11th to 20th	Day	43% 8% 16% 21% 11% 1	2800
	21st to end	Day	44% 8% 14% 22% 11% 1	2800
July	1st to 10th	Day	45% 8% 13% 20% 13% 1	6290
	11th to 20th	Day	38% 9% 17% 25% 11%	6285
	21st to end	Day	39% 7% 13% 24% 16% 1	6728
August	1st to 10th	Day	48% 9% 15% 20% 8% 1	4446
	11th to 20th	Day	39% 7% 18% 28% 7%	3886
	21st to end	Day	35% 7% 15% 31% 11% 1	4312
September	1st to 10th	Day	39% 8% 11% 24% 16% 2	2400
	11th to 20th	Day	33% 6% 12% 25% 22% 2	2302
	21st to end	Day	40% 8% 12% 22% 15% 2	2200
October	1st to 10th	Day	40% 5% 9% 20% 24% 1	3425
	11th to 20th	Day	34% 4 9% 27% 22% 3	3240
	21st to end	Day	35% 6% 14% 27% 16% 3	3196
November	1st to 10th	Day	39% 6% 13% 25% 15% 2	1851
	11th to 20th	Day	44% 6% 11% 20% 16% 2	1890
	21st to end	Day	47% 7% 14% 23% 8% 1	1764
December	1st to 10th	Day	49% 6% 14% 24% 7%	2680
	11th to 20th	Day	47% 5% 15% 20% 12% 2	3066
	21st to end	Day	54% 5% 9% 17% 13% 2	4048
January	1st to 10th	Night	53% 5% 13% 18% 11% 1	8234
	11th to 20th	Night	57% 3 14% 13% 10% 4	8280
	21st to end	Night	49% 4 11% 18% 15% 2	8800
February	1st to 10th	Night	50% 6% 12% 20% 10% 2	2730
	11th to 20th	Night	49% 6% 12% 18% 13% 2	2464
	21st to end	Night	49% 6% 10% 21% 11% 3	2076
March	1st to 10th	Night	50% 5% 12% 17% 13% 3	5399
	11th to 20th	Night	46% 8% 16% 19% 8% 3	5242
	21st to end	Night	51% 5% 6% 14% 20% 3	4966
April	1st to 10th	Night	54% 5% 9% 18% 11% 2	2000
	11th to 20th	Night	48% 5% 11% 18% 17% 1	1975
	21st to end	Night	46% 6% 9% 20% 16% 3	1920
May	1st to 10th	Night	59% 7% 12% 12% 9% 2	4060
	11th to 20th	Night	52% 8% 11% 17% 11% 1	3581
	21st to end	Night	50% 8% 12% 20% 10% 1	3927
June	1st to 10th	Night	42% 8% 11% 24% 13% 2	1600
	11th to 20th	Night	41% 9% 16% 24% 10%	1600
	21st to end	Night	37% 9% 14% 25% 14% 1	1600
July	1st to 10th	Night	41% 7% 15% 21% 15% 1	3560
	11th to 20th	Night	43% 9% 15% 21% 11% 1	3552
	21st to end	Night	36% 6% 13% 27% 16% 1	3809
August	1st to 10th	Night	49% 8% 14% 19% 9% 1	2641
	11th to 20th	Night	41% 7% 15% 27% 8%	3227
	21st to end	Night	32% 6% 13% 35% 13% 1	3586
September	1st to 10th	Night	39% 7% 11% 26% 16% 1	2000
	11th to 20th	Night	31% 6% 10% 27% 24% 1	2096
	21st to end	Night	39% 8% 10% 23% 19% 1	2200
October	1st to 10th	Night	43% 5% 12% 22% 17% 1	3751
	11th to 20th	Night	33% 4 11% 27% 24% 1	3899
	21st to end	Night	37% 5% 13% 29% 15% 1	4592
November	1st to 10th	Night	40% 6% 11% 23% 18% 2	2667
	11th to 20th	Night	47% 4 11% 20% 15% 3	2730
	21st to end	Night	45% 6% 16% 24% 8% 1	2854
December	1st to 10th	Night	51% 6% 13% 24% 6%	4720
	11th to 20th	Night	52% 5% 13% 14% 14% 2	5348
	21st to end	Night	55% 5% 10% 16% 11% 3	7150

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	27% 26% 30% 13% 4	220
	11th to 20th	Day	30% 30% 28% 9% 2	220
	21st to end	Day	26% 27% 33% 10% 3	286
February	1st to 10th	Day	33% 26% 32% 7% 2	330
	11th to 20th	Day	30% 27% 31% 11% 1	531
	21st to end	Day	28% 27% 33% 10% 2	446
March	1st to 10th	Day	29% 21% 33% 15% 2	508
	11th to 20th	Day	27% 24% 35% 12% 3 1	500
	21st to end	Day	36% 19% 27% 11% 5% 1	550
April	1st to 10th	Day	34% 22% 25% 12% 6% 1	500
	11th to 20th	Day	29% 25% 26% 15% 5% 1	492
	21st to end	Day	27% 20% 34% 13% 4 1	500
May	1st to 10th	Day	30% 20% 26% 16% 6% 1	503
	11th to 20th	Day	23% 17% 34% 19% 6% 1	527
	21st to end	Day	21% 13% 29% 25% 11% 2	573
June	1st to 10th	Day	20% 12% 33% 23% 12% 1	530
	11th to 20th	Day	18% 14% 29% 27% 11% 1	530
	21st to end	Day	16% 13% 32% 25% 12% 2	530
July	1st to 10th	Day	12% 9% 33% 30% 14% 2	525
	11th to 20th	Day	10% 8% 30% 32% 18% 2	524
	21st to end	Day	11% 10% 34% 30% 13% 2	576
August	1st to 10th	Day	12% 6% 29% 34% 14% 5%	526
	11th to 20th	Day	14% 7% 28% 28% 15% 7%	519
	21st to end	Day	11% 9% 30% 31% 14% 5%	583
September	1st to 10th	Day	18% 11% 23% 28% 15% 5%	530
	11th to 20th	Day	12% 10% 29% 23% 17% 10%	530
	21st to end	Day	21% 10% 29% 26% 11% 4	530
October	1st to 10th	Day	21% 13% 25% 22% 13% 5%	530
	11th to 20th	Day	20% 15% 35% 21% 7% 2	530
	21st to end	Day	25% 17% 30% 20% 6% 1	470
November	1st to 10th	Day	22% 21% 29% 19% 9% 1	425
	11th to 20th	Day	23% 26% 26% 19% 5% 1	430
	21st to end	Day	29% 22% 29% 19% 1	304
December	1st to 10th	Day	25% 26% 31% 12% 5%	220
	11th to 20th	Day	34% 25% 29% 11% 2	220
	21st to end	Day	27% 24% 33% 13% 4	242
January	1st to 10th	Night	22% 19% 39% 18% 2	840
	11th to 20th	Night	25% 22% 33% 18% 2	840
	21st to end	Night	21% 22% 38% 18% 2	924
February	1st to 10th	Night	23% 20% 36% 20% 2	840
	11th to 20th	Night	24% 20% 40% 16%	823
	21st to end	Night	27% 19% 37% 15% 2	692
March	1st to 10th	Night	25% 22% 36% 15% 3	809
	11th to 20th	Night	25% 21% 36% 15% 3	800
	21st to end	Night	25% 24% 31% 16% 4	880
April	1st to 10th	Night	26% 23% 30% 19% 3	800
	11th to 20th	Night	26% 19% 32% 18% 5%	791
	21st to end	Night	25% 18% 32% 20% 5% 1	720
May	1st to 10th	Night	26% 17% 31% 22% 5%	600
	11th to 20th	Night	19% 13% 38% 25% 4	399
	21st to end	Night	18% 9% 32% 32% 9%	433
June	1st to 10th	Night	17% 9% 32% 33% 9% 1	400
	11th to 20th	Night	16% 9% 31% 32% 12% 1	400
	21st to end	Night	13% 6% 29% 39% 13%	400
July	1st to 10th	Night	15% 4 21% 44% 17% 1	390
	11th to 20th	Night	13% 4 23% 44% 14% 1	388
	21st to end	Night	11% 5% 26% 44% 13% 1	438
August	1st to 10th	Night	11% 4 23% 44% 17% 1	424
	11th to 20th	Night	14% 4 19% 41% 20% 2	790
	21st to end	Night	15% 5% 23% 38% 18% 2	880
September	1st to 10th	Night	17% 5% 29% 32% 14% 2	800
	11th to 20th	Night	14% 7% 27% 28% 20% 4	800
	21st to end	Night	19% 8% 27% 33% 12% 2	800
October	1st to 10th	Night	23% 9% 25% 30% 11% 1	800
	11th to 20th	Night	19% 12% 34% 29% 7%	800
	21st to end	Night	26% 13% 34% 23% 5%	880
November	1st to 10th	Night	21% 15% 33% 24% 7%	820
	11th to 20th	Night	24% 15% 34% 21% 6% 1	840
	21st to end	Night	20% 18% 35% 22% 5%	840
December	1st to 10th	Night	26% 20% 31% 18% 5%	840
	11th to 20th	Night	26% 18% 33% 22% 2	840
	21st to end	Night	27% 18% 37% 16% 2	924

Page generated at 2026-02-28 01:40:24. Version ac07

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