Watoga State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Watoga State Park clear sky chart from 2005-11-06 to 2024-07-05.

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% 5% 5% 4 6% 7% 35%	89187
	Night	14% 8% 3 7% 5% 4 5% 4 6% 7% 38%	89997
Transparency	Day	47% 6% 10% 20% 14% 2	88959
	Night	44% 7% 11% 22% 14% 2	89829
Seeing	Day	24% 13% 24% 20% 13% 6%	14517
	Night	21% 11% 20% 29% 17% 2	24884

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% 12% 4 9% 5% 4 4 3 4 6% 34%	2836
	11th to 20th	Day	13% 11% 7% 14% 6% 5% 4 3 4 4 28%	2840
	21st to end	Day	19% 13% 4 8% 4 3 3 2 4 6% 33%	3124
February	1st to 10th	Day	13% 9% 4 8% 5% 4 5% 4 5% 6% 36%	1710
	11th to 20th	Day	16% 8% 3 9% 5% 5% 5% 4 5% 7% 33%	1691
	21st to end	Day	19% 10% 3 6% 5% 4 5% 4 4 5% 34%	1627
March	1st to 10th	Day	21% 8% 3 7% 4 4 4 4 5% 7% 32%	3435
	11th to 20th	Day	12% 7% 2 6% 4 4 4 4 5% 7% 46%	3480
	21st to end	Day	15% 11% 3 8% 5% 5% 5% 4 4 6% 35%	3815
April	1st to 10th	Day	11% 10% 3 7% 5% 4 4 4 5% 6% 40%	2162
	11th to 20th	Day	13% 9% 3 7% 4 4 4 4 4 7% 41%	2254
	21st to end	Day	18% 8% 3 7% 4 4 5% 4 5% 6% 35%	2441
May	1st to 10th	Day	18% 8% 4 9% 6% 5% 6% 4 6% 6% 27%	4082
	11th to 20th	Day	22% 8% 3 7% 5% 4 5% 4 6% 7% 28%	4081
	21st to end	Day	10% 6% 2 7% 5% 6% 7% 5% 8% 9% 35%	4476
June	1st to 10th	Day	14% 6% 2 6% 5% 5% 6% 5% 7% 8% 36%	2470
	11th to 20th	Day	11% 6% 2 7% 6% 7% 6% 5% 7% 9% 34%	2470
	21st to end	Day	10% 6% 3 6% 5% 6% 6% 5% 7% 9% 38%	2470
July	1st to 10th	Day	13% 6% 2 8% 6% 6% 6% 5% 7% 8% 33%	2392
	11th to 20th	Day	8% 6% 2 6% 7% 6% 7% 5% 8% 8% 36%	2340
	21st to end	Day	11% 8% 3 8% 7% 6% 6% 5% 8% 9% 29%	2547
August	1st to 10th	Day	15% 8% 2 7% 5% 5% 6% 5% 8% 10% 28%	2327
	11th to 20th	Day	15% 6% 3 8% 6% 7% 7% 5% 7% 8% 28%	2303
	21st to end	Day	11% 7% 2 7% 6% 6% 6% 5% 8% 9% 32%	2421
September	1st to 10th	Day	15% 6% 2 6% 4 4 5% 4 6% 8% 40%	2131
	11th to 20th	Day	14% 8% 2 7% 5% 4 4 3 5% 7% 41%	1980
	21st to end	Day	23% 5% 2 6% 4 4 4 3 5% 6% 35%	1980
October	1st to 10th	Day	17% 6% 3 6% 4 4 4 3 5% 6% 43%	1814
	11th to 20th	Day	17% 7% 2 7% 3 4 3 3 4 6% 44%	1800
	21st to end	Day	16% 9% 2 5% 4 4 3 3 4 6% 43%	1980
November	1st to 10th	Day	12% 8% 2 4 4 3 3 3 5% 6% 50%	1857
	11th to 20th	Day	14% 8% 2 6% 4 4 5% 3 5% 6% 43%	1710
	21st to end	Day	14% 7% 3 6% 5% 3 4 4 5% 7% 42%	1573
December	1st to 10th	Day	17% 13% 3 7% 5% 4 5% 3 5% 8% 30%	1520
	11th to 20th	Day	15% 9% 3 7% 3 4 3 4 4 5% 42%	1924
	21st to end	Day	19% 11% 4 7% 5% 5% 5% 4 6% 7% 27%	3124
January	1st to 10th	Night	11% 10% 5% 9% 6% 6% 7% 5% 6% 6% 28%	4109
	11th to 20th	Night	14% 11% 3 9% 6% 4 4 3 4 5% 37%	4120
	21st to end	Night	21% 11% 4 6% 4 4 4 3 4 5% 33%	4532
February	1st to 10th	Night	12% 8% 4 8% 6% 4 4 4 6% 7% 37%	2470
	11th to 20th	Night	16% 9% 3 8% 6% 5% 5% 5% 5% 6% 33%	2370
	21st to end	Night	16% 9% 3 8% 4 4 5% 4 6% 7% 34%	1826
March	1st to 10th	Night	22% 13% 3 8% 4 4 5% 3 5% 5% 28%	3418
	11th to 20th	Night	10% 5% 4 9% 5% 4 5% 4 5% 6% 44%	3480
	21st to end	Night	15% 7% 2 5% 4 3 4 3 6% 8% 41%	3817
April	1st to 10th	Night	13% 8% 4 6% 5% 4 4 4 5% 7% 39%	2016
	11th to 20th	Night	12% 7% 2 6% 5% 4 6% 3 6% 8% 42%	1875
	21st to end	Night	15% 5% 2 6% 5% 4 5% 4 6% 7% 42%	1753
May	1st to 10th	Night	20% 10% 3 8% 5% 4 5% 3 6% 6% 30%	2813
	11th to 20th	Night	24% 10% 3 6% 4 3 3 3 5% 7% 32%	2812
	21st to end	Night	11% 5% 2 7% 5% 5% 5% 5% 8% 10% 37%	3079
June	1st to 10th	Night	9% 6% 2 6% 3 4 5% 5% 7% 11% 43%	1710
	11th to 20th	Night	11% 5% 2 5% 5% 4 5% 4 7% 10% 43%	1710
	21st to end	Night	9% 4 1 5% 4 4 5% 5% 7% 11% 44%	1710
July	1st to 10th	Night	8% 5% 2 5% 5% 4 6% 5% 6% 9% 44%	1662
	11th to 20th	Night	6% 4 1 6% 4 4 5% 4 7% 10% 49%	1620
	21st to end	Night	7% 5% 2 6% 5% 6% 5% 4 7% 10% 42%	1771
August	1st to 10th	Night	13% 5% 2 6% 5% 5% 6% 5% 7% 10% 38%	1611
	11th to 20th	Night	13% 6% 3 7% 3 5% 5% 4 5% 10% 40%	1598
	21st to end	Night	11% 6% 2 6% 4 4 4 4 7% 10% 43%	1916
September	1st to 10th	Night	13% 5% 2 5% 4 3 5% 4 6% 8% 46%	1825
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 5% 7% 47%	1980
	21st to end	Night	20% 6% 2 5% 4 4 4 3 6% 6% 40%	1980
October	1st to 10th	Night	16% 6% 2 5% 4 3 4 3 6% 6% 45%	2146
	11th to 20th	Night	14% 8% 3 6% 4 5% 3 3 5% 6% 44%	2160
	21st to end	Night	15% 7% 2 6% 4 4 4 3 6% 7% 43%	2376
November	1st to 10th	Night	12% 7% 3 7% 4 4 3 4 4 6% 46%	2221
	11th to 20th	Night	14% 6% 3 5% 4 5% 4 4 6% 8% 41%	2465
	21st to end	Night	13% 7% 2 6% 5% 5% 5% 4 6% 6% 42%	2602
December	1st to 10th	Night	17% 9% 4 8% 6% 5% 5% 4 6% 6% 31%	2660
	11th to 20th	Night	14% 8% 5% 9% 5% 5% 4 3 5% 6% 36%	3252
	21st to end	Night	17% 8% 5% 7% 5% 6% 6% 5% 6% 7% 29%	4532

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 5% 22% 14% 2	2837
	11th to 20th	Day	59% 4 7% 14% 11% 4	2840
	21st to end	Day	54% 4 7% 20% 14% 2	3124
February	1st to 10th	Day	49% 5% 9% 21% 14% 2	1710
	11th to 20th	Day	51% 5% 8% 18% 14% 3	1700
	21st to end	Day	52% 5% 8% 17% 14% 4	1627
March	1st to 10th	Day	50% 5% 10% 23% 10% 2	3435
	11th to 20th	Day	38% 6% 8% 24% 21% 4	3480
	21st to end	Day	50% 6% 8% 20% 14% 3	3815
April	1st to 10th	Day	45% 5% 10% 19% 15% 5%	2162
	11th to 20th	Day	43% 5% 9% 22% 17% 3	2254
	21st to end	Day	49% 5% 11% 20% 12% 3	2441
May	1st to 10th	Day	54% 9% 9% 18% 9% 1	4120
	11th to 20th	Day	53% 8% 10% 20% 8% 1	4085
	21st to end	Day	40% 10% 15% 19% 12% 4	4489
June	1st to 10th	Day	43% 9% 13% 22% 14%	2470
	11th to 20th	Day	45% 8% 14% 18% 15% 1	2470
	21st to end	Day	42% 9% 13% 23% 12% 2	2470
July	1st to 10th	Day	46% 9% 12% 18% 12% 3	2327
	11th to 20th	Day	41% 11% 14% 21% 13% 1	2271
	21st to end	Day	48% 9% 12% 20% 11% 1	2405
August	1st to 10th	Day	48% 9% 15% 18% 9%	2314
	11th to 20th	Day	51% 9% 13% 19% 8%	2303
	21st to end	Day	45% 9% 14% 19% 10% 2	2421
September	1st to 10th	Day	42% 7% 11% 20% 16% 4	2131
	11th to 20th	Day	43% 5% 8% 23% 18% 3	1980
	21st to end	Day	49% 5% 9% 18% 16% 2	1980
October	1st to 10th	Day	43% 5% 9% 23% 16% 4	1814
	11th to 20th	Day	42% 4 11% 22% 18% 2	1800
	21st to end	Day	43% 4 8% 25% 17% 4	1980
November	1st to 10th	Day	36% 4 10% 23% 23% 4	1857
	11th to 20th	Day	42% 3 8% 21% 21% 5%	1710
	21st to end	Day	42% 4 12% 22% 18% 2	1573
December	1st to 10th	Day	53% 6% 10% 18% 12% 2	1520
	11th to 20th	Day	45% 4 7% 22% 18% 4	1920
	21st to end	Day	55% 5% 9% 19% 11% 1	3124
January	1st to 10th	Night	52% 8% 8% 17% 14% 2	4109
	11th to 20th	Night	51% 4 7% 20% 14% 4	4120
	21st to end	Night	53% 4 6% 22% 13% 2	4532
February	1st to 10th	Night	45% 5% 12% 21% 15% 1	2470
	11th to 20th	Night	51% 6% 8% 18% 14% 3	2372
	21st to end	Night	48% 6% 11% 20% 10% 5%	1826
March	1st to 10th	Night	56% 5% 8% 18% 10% 2	3418
	11th to 20th	Night	40% 5% 8% 26% 20% 1	3480
	21st to end	Night	40% 6% 11% 23% 16% 3	3817
April	1st to 10th	Night	45% 6% 12% 19% 15% 3	2016
	11th to 20th	Night	40% 6% 13% 20% 17% 4	1875
	21st to end	Night	41% 6% 13% 26% 13% 1	1753
May	1st to 10th	Night	54% 7% 12% 18% 8% 1	2840
	11th to 20th	Night	51% 8% 13% 21% 6% 1	2813
	21st to end	Night	38% 11% 18% 23% 6% 4	3087
June	1st to 10th	Night	34% 11% 14% 26% 14%	1710
	11th to 20th	Night	35% 10% 19% 23% 12% 1	1710
	21st to end	Night	32% 10% 19% 27% 12% 1	1710
July	1st to 10th	Night	36% 12% 15% 21% 14% 3	1617
	11th to 20th	Night	30% 10% 19% 26% 13% 2	1566
	21st to end	Night	35% 9% 17% 26% 13%	1672
August	1st to 10th	Night	40% 10% 17% 23% 9%	1600
	11th to 20th	Night	40% 9% 17% 22% 12% 1	1598
	21st to end	Night	36% 9% 17% 25% 11% 2	1916
September	1st to 10th	Night	36% 9% 15% 19% 18% 3	1825
	11th to 20th	Night	37% 6% 10% 26% 19% 2	1980
	21st to end	Night	44% 7% 11% 22% 15% 1	1980
October	1st to 10th	Night	40% 5% 11% 26% 16% 3	2146
	11th to 20th	Night	42% 4 11% 23% 18% 2	2160
	21st to end	Night	41% 5% 9% 24% 19% 4	2376
November	1st to 10th	Night	39% 4 11% 20% 21% 5%	2221
	11th to 20th	Night	40% 5% 10% 22% 20% 4	2465
	21st to end	Night	42% 5% 10% 22% 17% 4	2602
December	1st to 10th	Night	53% 5% 9% 20% 11% 2	2660
	11th to 20th	Night	49% 4 10% 20% 16% 1	3255
	21st to end	Night	52% 7% 9% 19% 12%	4532

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	40% 22% 22% 11% 4 1	270
	11th to 20th	Day	41% 23% 26% 9% 2	270
	21st to end	Day	41% 21% 24% 10% 4	297
February	1st to 10th	Day	37% 21% 29% 11% 3	270
	11th to 20th	Day	49% 21% 19% 9% 1	270
	21st to end	Day	43% 19% 26% 10% 2	282
March	1st to 10th	Day	33% 22% 23% 16% 6%	460
	11th to 20th	Day	34% 22% 22% 16% 5% 1	460
	21st to end	Day	28% 20% 28% 16% 6% 1	506
April	1st to 10th	Day	29% 22% 23% 16% 8% 1	460
	11th to 20th	Day	23% 18% 28% 17% 11% 3	452
	21st to end	Day	31% 17% 26% 13% 10% 3	460
May	1st to 10th	Day	28% 16% 29% 14% 8% 5%	463
	11th to 20th	Day	24% 12% 28% 19% 12% 6%	487
	21st to end	Day	17% 10% 24% 23% 17% 8%	529
June	1st to 10th	Day	18% 10% 27% 22% 15% 8%	490
	11th to 20th	Day	16% 9% 28% 21% 18% 8%	490
	21st to end	Day	11% 9% 31% 27% 14% 7%	490
July	1st to 10th	Day	14% 5% 21% 26% 21% 13%	461
	11th to 20th	Day	6% 5% 22% 32% 23% 13%	444
	21st to end	Day	14% 5% 22% 27% 21% 11%	488
August	1st to 10th	Day	17% 7% 19% 21% 22% 14%	446
	11th to 20th	Day	16% 3 20% 24% 22% 15%	439
	21st to end	Day	13% 4 20% 23% 21% 19%	495
September	1st to 10th	Day	17% 4 20% 22% 23% 15%	450
	11th to 20th	Day	17% 4 14% 29% 23% 13%	450
	21st to end	Day	26% 9% 20% 25% 14% 6%	450
October	1st to 10th	Day	23% 8% 19% 26% 19% 5%	450
	11th to 20th	Day	24% 14% 23% 23% 15% 2	450
	21st to end	Day	27% 15% 24% 21% 11% 2	495
November	1st to 10th	Day	22% 14% 27% 22% 11% 3	455
	11th to 20th	Day	37% 13% 26% 18% 6%	270
	21st to end	Day	27% 20% 30% 19% 4 1	205
December	1st to 10th	Day	32% 23% 27% 11% 6% 1	180
	11th to 20th	Day	32% 22% 23% 14% 8% 1	186
	21st to end	Day	34% 22% 24% 15% 4 1	297
January	1st to 10th	Night	30% 20% 25% 21% 4	760
	11th to 20th	Night	31% 15% 26% 24% 5%	760
	21st to end	Night	30% 17% 27% 23% 3	836
February	1st to 10th	Night	26% 18% 25% 28% 4	760
	11th to 20th	Night	32% 22% 26% 18% 2	743
	21st to end	Night	29% 19% 29% 22% 2	628
March	1st to 10th	Night	25% 17% 30% 23% 5%	760
	11th to 20th	Night	28% 18% 23% 24% 7% 1	760
	21st to end	Night	24% 17% 26% 24% 8% 1	836
April	1st to 10th	Night	24% 18% 26% 26% 6%	760
	11th to 20th	Night	21% 13% 24% 29% 13% 1	751
	21st to end	Night	21% 11% 22% 34% 11% 1	613
May	1st to 10th	Night	21% 9% 23% 31% 15% 1	570
	11th to 20th	Night	24% 8% 19% 32% 16% 1	561
	21st to end	Night	17% 2 17% 29% 31% 4	617
June	1st to 10th	Night	11% 3 17% 37% 30% 3	570
	11th to 20th	Night	12% 2 15% 34% 33% 3	570
	21st to end	Night	11% 3 13% 41% 27% 4	570
July	1st to 10th	Night	12% 2 11% 31% 36% 8%	539
	11th to 20th	Night	7% 1 8% 33% 45% 6%	522
	21st to end	Night	8% 3 10% 36% 38% 5%	591
August	1st to 10th	Night	16% 2 9% 33% 36% 5%	537
	11th to 20th	Night	14% 2 7% 33% 38% 6%	534
	21st to end	Night	13% 2 10% 30% 38% 7%	728
September	1st to 10th	Night	16% 3 11% 31% 32% 7%	720
	11th to 20th	Night	17% 3 11% 30% 34% 5%	720
	21st to end	Night	25% 4 14% 30% 25% 2	720
October	1st to 10th	Night	20% 7% 14% 28% 26% 4	720
	11th to 20th	Night	20% 13% 20% 28% 17% 2	720
	21st to end	Night	21% 12% 18% 34% 13% 1	792
November	1st to 10th	Night	18% 10% 20% 36% 15% 2	740
	11th to 20th	Night	25% 12% 18% 33% 11% 1	760
	21st to end	Night	23% 14% 19% 34% 9% 1	760
December	1st to 10th	Night	29% 16% 23% 26% 6% 1	760
	11th to 20th	Night	23% 17% 25% 30% 5% 1	760
	21st to end	Night	29% 12% 23% 31% 5%	836

Page generated at 2024-07-02 06:41:27. Version ac07

Copyright © 2024 Attilla Danko.