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 2024-12-02.

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% 8% 3 7% 5% 4 5% 4 6% 7% 36%	101579
	Night	17% 9% 3 7% 5% 4 4 3 5% 6% 36%	98057
Transparency	Day	44% 7% 13% 22% 13% 1	105099
	Night	46% 7% 12% 22% 13% 1	102626
Seeing	Day	21% 17% 30% 21% 9% 2	14970
	Night	21% 14% 32% 25% 7% 1	24061

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	14% 10% 3 7% 5% 4 4 4 6% 7% 37%	2517
	11th to 20th	Day	15% 12% 4 11% 5% 5% 6% 3 5% 6% 28%	2520
	21st to end	Day	20% 11% 5% 8% 5% 6% 4 4 4 6% 28%	2900
February	1st to 10th	Day	16% 11% 3 7% 7% 4 6% 5% 6% 5% 30%	1710
	11th to 20th	Day	13% 10% 3 9% 6% 5% 4 4 5% 6% 35%	1843
	21st to end	Day	18% 11% 3 7% 5% 5% 4 3 5% 5% 34%	1570
March	1st to 10th	Day	24% 13% 4 8% 4 3 3 2 3 4 30%	3116
	11th to 20th	Day	12% 10% 4 8% 5% 5% 4 4 5% 7% 36%	3286
	21st to end	Day	20% 9% 2 6% 4 4 4 3 4 5% 37%	4161
April	1st to 10th	Day	19% 11% 3 7% 4 4 4 3 6% 5% 36%	2280
	11th to 20th	Day	16% 7% 3 6% 4 4 4 3 6% 6% 40%	2254
	21st to end	Day	19% 7% 3 6% 5% 5% 5% 4 4 6% 38%	2354
May	1st to 10th	Day	24% 8% 3 7% 4 4 4 3 6% 7% 31%	4130
	11th to 20th	Day	19% 7% 3 7% 5% 4 4 4 5% 7% 33%	4398
	21st to end	Day	12% 5% 2 4 4 4 5% 4 7% 9% 43%	4837
June	1st to 10th	Day	16% 6% 2 6% 5% 5% 5% 5% 7% 9% 34%	2660
	11th to 20th	Day	14% 6% 2 6% 5% 5% 5% 5% 7% 11% 35%	2660
	21st to end	Day	14% 7% 2 7% 5% 6% 5% 5% 6% 9% 35%	2660
July	1st to 10th	Day	9% 6% 3 8% 5% 6% 6% 5% 7% 10% 37%	4440
	11th to 20th	Day	9% 6% 2 7% 5% 5% 6% 5% 8% 10% 38%	4440
	21st to end	Day	12% 8% 3 7% 6% 5% 5% 5% 7% 7% 34%	4814
August	1st to 10th	Day	16% 8% 2 8% 5% 5% 5% 4 6% 8% 31%	4324
	11th to 20th	Day	11% 7% 3 7% 4 5% 5% 4 7% 9% 39%	3730
	21st to end	Day	9% 6% 2 6% 5% 5% 6% 5% 6% 9% 42%	4180
September	1st to 10th	Day	12% 6% 3 6% 5% 5% 4 4 5% 8% 43%	2280
	11th to 20th	Day	12% 5% 2 6% 4 4 4 3 5% 7% 49%	2187
	21st to end	Day	16% 5% 3 5% 4 4 4 4 7% 7% 41%	2090
October	1st to 10th	Day	20% 6% 2 6% 5% 5% 3 4 4 6% 39%	1995
	11th to 20th	Day	14% 7% 2 7% 4 4 4 3 4 7% 43%	1900
	21st to end	Day	22% 8% 2 6% 4 4 5% 4 5% 6% 34%	1896
November	1st to 10th	Day	13% 8% 2 6% 3 4 3 2 5% 7% 47%	1761
	11th to 20th	Day	16% 9% 2 7% 4 5% 4 3 5% 6% 40%	1800
	21st to end	Day	18% 10% 3 5% 4 4 4 4 5% 7% 36%	1680
December	1st to 10th	Day	17% 11% 4 9% 5% 5% 5% 4 6% 6% 29%	1528
	11th to 20th	Day	24% 8% 2 6% 5% 3 3 3 4 5% 36%	1906
	21st to end	Day	23% 14% 4 9% 5% 4 4 4 4 6% 23%	2772
January	1st to 10th	Night	16% 10% 3 8% 5% 4 3 3 4 6% 38%	4429
	11th to 20th	Night	15% 12% 5% 12% 7% 4 4 3 5% 5% 30%	4440
	21st to end	Night	26% 12% 3 8% 4 4 4 3 4 5% 27%	4753
February	1st to 10th	Night	16% 10% 4 7% 5% 5% 5% 4 5% 5% 33%	2470
	11th to 20th	Night	13% 11% 4 8% 5% 5% 5% 4 7% 6% 32%	2222
	21st to end	Night	18% 10% 3 5% 6% 5% 4 4 4 6% 35%	1884
March	1st to 10th	Night	25% 11% 3 7% 4 4 4 3 4 5% 31%	3724
	11th to 20th	Night	13% 13% 3 8% 5% 5% 5% 4 5% 5% 34%	3657
	21st to end	Night	18% 11% 3 9% 4 4 4 2 4 4 37%	3470
April	1st to 10th	Night	17% 10% 3 8% 6% 5% 4 4 5% 7% 31%	1900
	11th to 20th	Night	20% 9% 3 5% 5% 4 3 3 4 6% 37%	1875
	21st to end	Night	22% 7% 3 6% 4 3 4 3 4 6% 38%	1824
May	1st to 10th	Night	25% 9% 3 7% 3 4 3 3 4 5% 32%	2834
	11th to 20th	Night	19% 9% 3 8% 5% 4 5% 4 5% 6% 33%	2500
	21st to end	Night	14% 6% 2 7% 4 4 5% 5% 6% 8% 41%	2738
June	1st to 10th	Night	16% 6% 2 5% 5% 3 4 5% 5% 8% 40%	1520
	11th to 20th	Night	14% 6% 3 5% 5% 5% 4 4 6% 8% 40%	1520
	21st to end	Night	13% 5% 2 6% 5% 5% 5% 5% 6% 8% 42%	1520
July	1st to 10th	Night	10% 5% 3 7% 4 5% 5% 4 7% 8% 41%	2520
	11th to 20th	Night	11% 6% 2 7% 5% 5% 5% 4 7% 10% 37%	2520
	21st to end	Night	14% 9% 3 7% 5% 4 4 4 5% 6% 40%	2739
August	1st to 10th	Night	20% 6% 3 7% 5% 5% 5% 5% 5% 7% 32%	2570
	11th to 20th	Night	13% 8% 3 7% 4 4 5% 4 6% 8% 38%	3097
	21st to end	Night	10% 5% 3 6% 4 4 4 4 5% 8% 47%	3476
September	1st to 10th	Night	14% 7% 2 5% 4 5% 4 3 5% 7% 43%	1900
	11th to 20th	Night	13% 4 2 4 3 3 4 3 4 7% 53%	1991
	21st to end	Night	14% 7% 2 6% 4 4 4 4 5% 6% 44%	2090
October	1st to 10th	Night	19% 7% 2 7% 4 4 4 3 5% 6% 39%	2181
	11th to 20th	Night	15% 7% 3 7% 4 3 4 3 5% 7% 43%	2280
	21st to end	Night	23% 7% 2 7% 4 4 3 2 5% 6% 36%	2700
November	1st to 10th	Night	14% 8% 2 6% 4 3 3 3 4 7% 45%	2537
	11th to 20th	Night	19% 8% 3 7% 4 4 4 3 4 6% 40%	2600
	21st to end	Night	16% 9% 2 7% 4 4 4 3 5% 7% 38%	2718
December	1st to 10th	Night	21% 10% 3 6% 4 4 4 4 5% 6% 33%	2686
	11th to 20th	Night	21% 11% 2 7% 5% 4 4 4 5% 6% 32%	3288
	21st to end	Night	23% 12% 5% 8% 5% 4 4 3 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	44% 5% 15% 28% 7% 1	2518
	11th to 20th	Day	53% 7% 12% 21% 6% 1	2520
	21st to end	Day	57% 8% 9% 19% 7% 1	2900
February	1st to 10th	Day	53% 6% 12% 17% 10% 1	1710
	11th to 20th	Day	48% 6% 10% 22% 12% 2	1852
	21st to end	Day	51% 6% 11% 19% 12% 2	1570
March	1st to 10th	Day	57% 5% 11% 17% 9% 2	3119
	11th to 20th	Day	41% 11% 15% 22% 9% 2	3286
	21st to end	Day	47% 7% 6% 15% 21% 4	4161
April	1st to 10th	Day	50% 6% 9% 20% 12% 3	2280
	11th to 20th	Day	45% 6% 11% 21% 16% 2	2254
	21st to end	Day	47% 6% 10% 20% 14% 3	2354
May	1st to 10th	Day	53% 8% 12% 16% 11% 1	4144
	11th to 20th	Day	47% 9% 13% 20% 9% 1	4402
	21st to end	Day	34% 9% 13% 27% 15% 2	4837
June	1st to 10th	Day	44% 9% 14% 21% 12% 1	2660
	11th to 20th	Day	42% 9% 16% 22% 10% 1	2660
	21st to end	Day	44% 8% 14% 22% 11% 1	2660
July	1st to 10th	Day	42% 8% 14% 21% 15% 1	4370
	11th to 20th	Day	38% 9% 17% 23% 12% 1	4365
	21st to end	Day	45% 9% 14% 17% 14% 1	4661
August	1st to 10th	Day	48% 9% 15% 20% 8% 1	4310
	11th to 20th	Day	39% 8% 18% 28% 7%	3766
	21st to end	Day	35% 7% 15% 31% 11% 1	4180
September	1st to 10th	Day	40% 8% 12% 23% 16% 2	2280
	11th to 20th	Day	34% 7% 11% 25% 22% 2	2187
	21st to end	Day	40% 8% 12% 22% 16% 2	2090
October	1st to 10th	Day	41% 5% 9% 20% 24% 1	3320
	11th to 20th	Day	34% 4 9% 27% 23% 3	3140
	21st to end	Day	35% 6% 14% 26% 15% 3	3096
November	1st to 10th	Day	38% 6% 14% 25% 15% 2	1761
	11th to 20th	Day	44% 6% 12% 20% 17% 2	1800
	21st to end	Day	46% 7% 14% 23% 8% 1	1680
December	1st to 10th	Day	54% 7% 14% 16% 9%	1528
	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	45% 6% 13% 25% 9% 2	4429
	11th to 20th	Night	54% 5% 13% 17% 9% 2	4440
	21st to end	Night	58% 6% 10% 18% 8% 1	4753
February	1st to 10th	Night	51% 6% 13% 19% 9% 2	2470
	11th to 20th	Night	50% 7% 11% 18% 13% 2	2224
	21st to end	Night	49% 6% 10% 20% 11% 3	1884
March	1st to 10th	Night	54% 7% 10% 19% 10% 1	3734
	11th to 20th	Night	45% 10% 13% 21% 9% 2	3658
	21st to end	Night	48% 6% 7% 14% 20% 4	3470
April	1st to 10th	Night	53% 5% 9% 19% 12% 2	1900
	11th to 20th	Night	48% 5% 10% 19% 17% 1	1875
	21st to end	Night	46% 6% 9% 20% 15% 3	1824
May	1st to 10th	Night	54% 8% 10% 17% 9% 2	2840
	11th to 20th	Night	49% 10% 13% 18% 9% 1	2501
	21st to end	Night	39% 10% 14% 22% 13% 2	2739
June	1st to 10th	Night	41% 8% 11% 25% 12% 2	1520
	11th to 20th	Night	40% 9% 16% 24% 10%	1520
	21st to end	Night	37% 10% 13% 26% 14% 1	1520
July	1st to 10th	Night	39% 8% 16% 20% 16% 1	2480
	11th to 20th	Night	40% 8% 16% 24% 12%	2472
	21st to end	Night	44% 7% 14% 18% 15% 2	2651
August	1st to 10th	Night	49% 9% 14% 19% 9%	2560
	11th to 20th	Night	42% 7% 16% 27% 8%	3127
	21st to end	Night	32% 6% 13% 35% 13%	3476
September	1st to 10th	Night	39% 7% 11% 26% 16% 1	1900
	11th to 20th	Night	32% 6% 10% 27% 24% 1	1991
	21st to end	Night	39% 8% 10% 24% 19% 1	2090
October	1st to 10th	Night	44% 5% 12% 22% 17% 1	3636
	11th to 20th	Night	32% 4 11% 26% 25% 1	3779
	21st to end	Night	37% 5% 13% 29% 15% 1	4450
November	1st to 10th	Night	39% 6% 12% 22% 18% 3	2537
	11th to 20th	Night	46% 4 12% 20% 15% 3	2600
	21st to end	Night	45% 6% 16% 24% 8% 1	2718
December	1st to 10th	Night	51% 8% 13% 19% 9%	2686
	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	27% 30% 29% 11% 3	180
	21st to end	Day	22% 27% 36% 11% 4	234
February	1st to 10th	Day	33% 26% 33% 6% 2	270
	11th to 20th	Day	28% 28% 31% 12% 1	451
	21st to end	Day	29% 25% 33% 10% 3	382
March	1st to 10th	Day	27% 21% 34% 16% 2	460
	11th to 20th	Day	26% 24% 35% 12% 2 1	460
	21st to end	Day	35% 19% 28% 12% 5% 2	506
April	1st to 10th	Day	32% 22% 27% 13% 6% 1	460
	11th to 20th	Day	27% 26% 25% 15% 5% 1	452
	21st to end	Day	27% 20% 33% 13% 5% 1	460
May	1st to 10th	Day	30% 20% 26% 17% 6% 1	463
	11th to 20th	Day	23% 16% 35% 20% 6% 1	487
	21st to end	Day	18% 13% 29% 27% 12% 2	529
June	1st to 10th	Day	19% 11% 34% 23% 12% 1	490
	11th to 20th	Day	16% 14% 29% 28% 11% 1	490
	21st to end	Day	16% 14% 32% 24% 12% 2	490
July	1st to 10th	Day	11% 9% 33% 29% 14% 2	485
	11th to 20th	Day	11% 7% 30% 33% 17% 2	484
	21st to end	Day	11% 10% 34% 30% 13% 2	532
August	1st to 10th	Day	13% 7% 29% 34% 13% 5%	486
	11th to 20th	Day	15% 7% 29% 28% 15% 7%	479
	21st to end	Day	12% 9% 28% 31% 14% 6%	539
September	1st to 10th	Day	18% 10% 23% 28% 15% 6%	490
	11th to 20th	Day	13% 10% 29% 21% 16% 10%	490
	21st to end	Day	21% 10% 29% 25% 11% 4	490
October	1st to 10th	Day	22% 14% 25% 22% 13% 4	490
	11th to 20th	Day	18% 15% 36% 21% 8% 2	490
	21st to end	Day	26% 17% 30% 20% 7% 1	436
November	1st to 10th	Day	21% 19% 30% 19% 9% 1	395
	11th to 20th	Day	23% 26% 27% 19% 5% 1	400
	21st to end	Day	28% 21% 28% 21% 1	280
December	1st to 10th	Day	22% 28% 33% 12% 5%	182
	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% 34% 19% 1	760
	21st to end	Night	20% 20% 38% 19% 2	836
February	1st to 10th	Night	22% 19% 37% 20% 1	760
	11th to 20th	Night	22% 20% 41% 16%	743
	21st to end	Night	28% 19% 36% 15% 2	628
March	1st to 10th	Night	24% 21% 36% 16% 3	760
	11th to 20th	Night	25% 20% 37% 14% 3	760
	21st to end	Night	25% 23% 30% 17% 5%	836
April	1st to 10th	Night	24% 22% 32% 19% 3	760
	11th to 20th	Night	25% 19% 32% 19% 5%	751
	21st to end	Night	25% 17% 32% 21% 5% 1	684
May	1st to 10th	Night	24% 16% 31% 23% 5%	570
	11th to 20th	Night	19% 13% 38% 25% 4	379
	21st to end	Night	17% 9% 31% 33% 9%	411
June	1st to 10th	Night	16% 8% 32% 33% 10% 1	380
	11th to 20th	Night	15% 9% 31% 32% 12% 1	380
	21st to end	Night	13% 6% 29% 39% 12%	380
July	1st to 10th	Night	15% 3 20% 44% 18% 1	370
	11th to 20th	Night	13% 5% 23% 43% 15% 1	368
	21st to end	Night	12% 5% 24% 44% 14% 1	416
August	1st to 10th	Night	10% 4 24% 43% 16% 1	403
	11th to 20th	Night	15% 4 19% 41% 20% 2	750
	21st to end	Night	14% 5% 23% 38% 19% 2	836
September	1st to 10th	Night	17% 5% 30% 32% 14% 2	760
	11th to 20th	Night	14% 8% 27% 28% 19% 4	760
	21st to end	Night	19% 8% 27% 33% 12% 2	760
October	1st to 10th	Night	23% 9% 25% 30% 11% 1	760
	11th to 20th	Night	18% 12% 33% 29% 8%	760
	21st to end	Night	26% 13% 33% 22% 5%	836
November	1st to 10th	Night	20% 16% 33% 24% 7%	780
	11th to 20th	Night	24% 14% 34% 21% 6% 1	800
	21st to end	Night	20% 17% 35% 23% 5% 1	800
December	1st to 10th	Night	26% 21% 31% 18% 5%	768
	11th to 20th	Night	24% 18% 34% 22% 2	760
	21st to end	Night	27% 17% 38% 16% 2	836

Page generated at 2024-11-29 10:43:09. Version ac07

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