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 2024-12-02.

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	14% 8% 3 7% 5% 5% 5% 4 6% 7% 35%	100892
	Night	14% 8% 3 7% 5% 4 5% 4 6% 7% 38%	98673
Transparency	Day	45% 6% 11% 21% 13% 3	104541
	Night	43% 6% 11% 22% 14% 3	103163
Seeing	Day	24% 13% 24% 20% 13% 6%	15087
	Night	21% 11% 19% 30% 17% 2	25436

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	8% 5% 2 7% 6% 6% 7% 5% 7% 9% 39%	4120
	11th to 20th	Day	9% 5% 2 5% 6% 6% 6% 5% 8% 10% 37%	4120
	21st to end	Day	15% 10% 4 10% 7% 6% 6% 5% 7% 8% 24%	4466
August	1st to 10th	Day	14% 7% 2 8% 6% 6% 7% 6% 8% 10% 28%	4104
	11th to 20th	Day	10% 6% 3 9% 7% 7% 7% 5% 7% 8% 30%	4044
	21st to end	Day	7% 5% 2 6% 5% 6% 6% 5% 7% 10% 42%	4253
September	1st to 10th	Day	14% 6% 2 6% 4 4 5% 4 5% 8% 42%	2249
	11th to 20th	Day	14% 8% 2 7% 5% 4 4 3 6% 7% 40%	2090
	21st to end	Day	24% 6% 2 6% 4 4 4 4 5% 6% 34%	2090
October	1st to 10th	Day	16% 6% 3 6% 4 4 3 3 5% 6% 44%	1914
	11th to 20th	Day	17% 7% 2 7% 3 4 3 3 4 6% 46%	1900
	21st to end	Day	15% 9% 2 5% 4 4 3 3 4 6% 45%	2090
November	1st to 10th	Day	11% 8% 2 4 4 3 4 3 5% 6% 49%	1957
	11th to 20th	Day	14% 8% 2 6% 4 4 5% 3 5% 6% 43%	1800
	21st to end	Day	13% 7% 3 7% 5% 3 4 4 5% 7% 41%	1655
December	1st to 10th	Day	17% 13% 4 7% 5% 4 5% 3 5% 8% 30%	1528
	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	6% 4 2 6% 5% 5% 7% 6% 7% 11% 42%	2840
	11th to 20th	Night	8% 5% 2 6% 4 4 5% 4 6% 11% 45%	2840
	21st to end	Night	11% 10% 4 9% 6% 6% 6% 4 6% 8% 30%	3087
August	1st to 10th	Night	15% 6% 3 7% 5% 4 5% 4 6% 9% 35%	2825
	11th to 20th	Night	12% 6% 3 8% 5% 6% 6% 4 6% 9% 35%	2785
	21st to end	Night	8% 6% 2 5% 4 4 3 3 5% 8% 51%	3370
September	1st to 10th	Night	12% 5% 2 5% 4 3 5% 5% 5% 8% 46%	1927
	11th to 20th	Night	15% 6% 2 5% 3 3 4 3 5% 7% 46%	2090
	21st to end	Night	22% 6% 2 5% 4 4 3 3 6% 6% 39%	2090
October	1st to 10th	Night	16% 6% 2 5% 4 3 4 3 5% 6% 46%	2266
	11th to 20th	Night	13% 8% 3 6% 4 5% 3 3 5% 6% 45%	2280
	21st to end	Night	14% 7% 2 5% 4 4 4 3 5% 7% 45%	2508
November	1st to 10th	Night	12% 7% 3 7% 4 4 3 4 5% 7% 46%	2341
	11th to 20th	Night	14% 6% 3 5% 4 5% 4 4 6% 8% 40%	2595
	21st to end	Night	13% 7% 3 6% 5% 5% 5% 4 6% 6% 41%	2739
December	1st to 10th	Night	17% 9% 4 8% 6% 5% 5% 4 6% 6% 31%	2686
	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	40% 9% 18% 20% 8% 5%	4055
	11th to 20th	Day	39% 8% 15% 28% 10% 1	4051
	21st to end	Day	56% 7% 11% 19% 7% 1	4324
August	1st to 10th	Day	48% 9% 16% 20% 7%	4091
	11th to 20th	Day	47% 8% 11% 22% 11%	4083
	21st to end	Day	36% 7% 16% 28% 12% 1	4253
September	1st to 10th	Day	41% 6% 11% 19% 18% 5%	2249
	11th to 20th	Day	43% 5% 8% 23% 18% 2	2090
	21st to end	Day	50% 5% 9% 18% 15% 2	2090
October	1st to 10th	Day	31% 6% 8% 22% 26% 8%	3174
	11th to 20th	Day	32% 3 11% 24% 15% 15%	3140
	21st to end	Day	29% 3 9% 30% 16% 13%	3428
November	1st to 10th	Day	37% 4 10% 23% 23% 4	1957
	11th to 20th	Day	42% 3 8% 20% 22% 5%	1800
	21st to end	Day	43% 4 12% 22% 18% 2	1655
December	1st to 10th	Day	53% 5% 9% 18% 12% 2	1528
	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	35% 11% 18% 22% 12% 3	2795
	11th to 20th	Night	33% 9% 19% 30% 8% 1	2786
	21st to end	Night	50% 10% 13% 20% 7%	2988
August	1st to 10th	Night	45% 9% 17% 24% 5%	2814
	11th to 20th	Night	44% 9% 14% 22% 11% 1	2812
	21st to end	Night	31% 7% 16% 32% 12% 1	3370
September	1st to 10th	Night	36% 9% 14% 18% 19% 4	1927
	11th to 20th	Night	38% 6% 10% 25% 20% 2	2090
	21st to end	Night	46% 7% 11% 22% 14% 1	2090
October	1st to 10th	Night	35% 4 7% 25% 24% 4	3786
	11th to 20th	Night	36% 4 9% 19% 20% 13%	3779
	21st to end	Night	26% 3 11% 28% 21% 11%	4120
November	1st to 10th	Night	39% 4 11% 20% 21% 5%	2341
	11th to 20th	Night	41% 5% 9% 21% 20% 4	2595
	21st to end	Night	43% 5% 10% 22% 17% 4	2739
December	1st to 10th	Night	53% 5% 9% 19% 11% 2	2686
	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% 6% 22% 25% 20% 13%	485
	11th to 20th	Day	6% 5% 23% 31% 22% 12%	484
	21st to end	Day	16% 5% 23% 27% 19% 10%	532
August	1st to 10th	Day	17% 7% 21% 20% 21% 13%	486
	11th to 20th	Day	15% 5% 22% 24% 20% 14%	479
	21st to end	Day	12% 3 20% 24% 22% 19%	539
September	1st to 10th	Day	16% 5% 19% 24% 22% 14%	490
	11th to 20th	Day	18% 4 16% 28% 22% 12%	490
	21st to end	Day	28% 9% 20% 24% 14% 5%	490
October	1st to 10th	Day	21% 9% 20% 27% 19% 5%	490
	11th to 20th	Day	23% 14% 22% 22% 16% 3	490
	21st to end	Day	25% 14% 25% 22% 12% 2	539
November	1st to 10th	Day	22% 14% 28% 22% 11% 3	495
	11th to 20th	Day	36% 14% 28% 17% 6%	300
	21st to end	Day	30% 20% 28% 18% 4 1	227
December	1st to 10th	Day	32% 24% 26% 10% 6% 1	182
	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	11% 2 12% 32% 36% 8%	555
	11th to 20th	Night	8% 1 8% 34% 44% 6%	552
	21st to end	Night	9% 2 10% 38% 36% 4	624
August	1st to 10th	Night	16% 2 9% 34% 35% 4	567
	11th to 20th	Night	14% 3 8% 33% 37% 5%	564
	21st to end	Night	12% 2 10% 31% 38% 6%	769
September	1st to 10th	Night	15% 3 11% 33% 30% 7%	760
	11th to 20th	Night	19% 3 11% 30% 33% 5%	760
	21st to end	Night	27% 4 14% 29% 24% 2	760
October	1st to 10th	Night	20% 7% 14% 29% 26% 4	760
	11th to 20th	Night	19% 13% 20% 29% 17% 1	760
	21st to end	Night	20% 11% 18% 34% 14% 1	836
November	1st to 10th	Night	18% 10% 19% 37% 14% 2	780
	11th to 20th	Night	25% 12% 19% 33% 10% 1	800
	21st to end	Night	23% 14% 20% 34% 8% 1	800
December	1st to 10th	Night	29% 17% 23% 26% 6% 1	768
	11th to 20th	Night	23% 17% 25% 30% 5% 1	760
	21st to end	Night	29% 12% 23% 31% 5%	836

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