Buescher State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Buescher State Park clear sky chart from 2005-11-06 to 2025-09-19.

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	12% 6% 2 6% 4 4 4 4 6% 8% 44%	126224
	Night	14% 6% 2 5% 3 3 3 3 5% 7% 48%	123114
Transparency	Day	38% 4 10% 21% 18% 9%	129954
	Night	36% 3 11% 21% 18% 11%	127434
Seeing	Day	14% 7% 20% 27% 24% 8%	16035
	Night	15% 6% 25% 35% 16% 2	25857

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	17% 10% 3 6% 3 3 3 2 4 5% 44%	4077
	11th to 20th	Day	15% 5% 2 5% 3 2 4 2 5% 5% 51%	4080
	21st to end	Day	29% 8% 3 5% 2 2 2 2 3 5% 39%	4608
February	1st to 10th	Day	22% 7% 2 6% 3 3 3 3 4 5% 42%	2000
	11th to 20th	Day	21% 8% 2 7% 3 3 3 2 3 5% 43%	1949
	21st to end	Day	18% 8% 2 6% 4 3 3 3 4 4 45%	1690
March	1st to 10th	Day	13% 6% 2 7% 4 4 3 3 4 6% 46%	4936
	11th to 20th	Day	14% 6% 2 5% 4 3 3 3 4 6% 48%	4980
	21st to end	Day	17% 9% 3 6% 3 3 3 3 4 6% 42%	5462
April	1st to 10th	Day	15% 8% 3 7% 4 4 4 4 5% 7% 40%	2200
	11th to 20th	Day	14% 8% 3 8% 5% 4 4 3 5% 5% 41%	2203
	21st to end	Day	15% 6% 2 6% 4 3 5% 3 5% 7% 43%	2475
May	1st to 10th	Day	19% 7% 3 7% 5% 5% 4 4 6% 7% 34%	5862
	11th to 20th	Day	11% 6% 2 6% 4 4 4 4 5% 8% 44%	5862
	21st to end	Day	11% 6% 3 7% 5% 5% 6% 5% 7% 9% 36%	6434
June	1st to 10th	Day	5% 3 2 6% 4 5% 6% 5% 7% 9% 49%	2600
	11th to 20th	Day	6% 4 2 5% 4 5% 6% 4 7% 10% 47%	2600
	21st to end	Day	6% 7% 2 6% 6% 6% 7% 6% 8% 10% 37%	2600
July	1st to 10th	Day	9% 6% 2 7% 5% 5% 5% 5% 7% 10% 37%	5900
	11th to 20th	Day	5% 5% 2 6% 5% 6% 6% 5% 8% 14% 39%	5900
	21st to end	Day	7% 6% 2 7% 5% 5% 6% 5% 8% 11% 38%	6422
August	1st to 10th	Day	1 1 1 3 2 3 4 4 6% 10% 64%	4234
	11th to 20th	Day	3 2 1 3 3 4 5% 6% 8% 13% 51%	4047
	21st to end	Day	4 3 2 6% 5% 6% 6% 5% 9% 11% 44%	4019
September	1st to 10th	Day	6% 6% 2 7% 6% 5% 7% 4 5% 8% 43%	2200
	11th to 20th	Day	9% 6% 2 7% 6% 6% 6% 5% 7% 7% 41%	2178
	21st to end	Day	6% 5% 2 6% 4 5% 6% 5% 6% 8% 48%	2090
October	1st to 10th	Day	5% 4 1 4 4 4 4 5% 6% 7% 57%	2089
	11th to 20th	Day	14% 4 2 5% 4 3 4 2 3 5% 54%	1900
	21st to end	Day	12% 5% 1 5% 3 3 3 3 3 6% 56%	2090
November	1st to 10th	Day	13% 6% 2 6% 3 4 3 3 5% 6% 47%	1958
	11th to 20th	Day	12% 5% 2 5% 3 3 4 3 5% 5% 53%	1960
	21st to end	Day	17% 8% 2 5% 4 3 4 3 4 5% 44%	1800
December	1st to 10th	Day	24% 9% 3 7% 3 3 3 3 4 5% 36%	2940
	11th to 20th	Day	18% 8% 3 6% 4 4 3 3 4 5% 43%	3391
	21st to end	Day	14% 7% 2 5% 3 3 3 3 3 4 52%	4488
January	1st to 10th	Night	20% 8% 2 4 2 3 3 2 3 5% 48%	5888
	11th to 20th	Night	14% 4 1 3 2 3 3 2 3 5% 59%	5900
	21st to end	Night	30% 6% 2 5% 3 2 2 2 3 5% 39%	6399
February	1st to 10th	Night	20% 8% 3 5% 3 3 3 2 4 5% 45%	2400
	11th to 20th	Night	22% 7% 2 5% 3 2 2 3 4 5% 46%	2338
	21st to end	Night	22% 8% 2 5% 4 3 3 2 3 6% 42%	1937
March	1st to 10th	Night	18% 8% 2 5% 4 4 4 3 5% 6% 42%	4919
	11th to 20th	Night	19% 7% 2 5% 3 3 3 3 4 5% 47%	4980
	21st to end	Night	20% 9% 2 5% 3 3 4 2 3 5% 41%	5467
April	1st to 10th	Night	13% 7% 3 6% 4 3 3 4 6% 7% 45%	2200
	11th to 20th	Night	17% 7% 2 5% 4 3 3 3 5% 7% 45%	2143
	21st to end	Night	15% 7% 2 5% 4 3 3 3 5% 6% 46%	1919
May	1st to 10th	Night	24% 9% 2 7% 4 3 4 4 5% 6% 31%	4053
	11th to 20th	Night	10% 6% 2 7% 4 4 4 4 6% 8% 46%	4053
	21st to end	Night	12% 8% 3 6% 4 5% 5% 4 6% 9% 37%	4443
June	1st to 10th	Night	5% 2 1 4 4 3 3 3 6% 10% 58%	1800
	11th to 20th	Night	5% 2 1 4 4 3 4 5% 6% 10% 57%	1800
	21st to end	Night	5% 5% 2 5% 5% 4 5% 4 7% 10% 49%	1800
July	1st to 10th	Night	8% 6% 3 7% 4 5% 5% 4 7% 11% 41%	4078
	11th to 20th	Night	4 4 2 5% 3 4 5% 4 6% 12% 51%	4077
	21st to end	Night	7% 5% 3 7% 4 4 5% 4 6% 10% 45%	4449
August	1st to 10th	Night	1 1 2 2 2 3 3 5% 9% 72%	2926
	11th to 20th	Night	2 2 1 3 2 3 4 3 8% 13% 59%	3007
	21st to end	Night	3 3 1 3 3 4 5% 4 8% 12% 54%	3880
September	1st to 10th	Night	6% 5% 2 5% 5% 4 4 4 6% 9% 50%	2200
	11th to 20th	Night	8% 6% 2 6% 5% 4 5% 3 6% 8% 47%	2178
	21st to end	Night	7% 4 2 5% 4 3 4 4 6% 8% 53%	2090
October	1st to 10th	Night	3 4 1 4 3 3 3 3 5% 7% 65%	2090
	11th to 20th	Night	11% 5% 2 4 3 3 3 2 5% 5% 58%	2261
	21st to end	Night	13% 5% 1 3 3 2 3 2 3 5% 60%	2508
November	1st to 10th	Night	13% 4 2 5% 4 4 3 3 5% 5% 52%	2340
	11th to 20th	Night	11% 6% 1 4 4 3 4 2 4 7% 53%	2435
	21st to end	Night	17% 6% 2 4 4 3 3 3 4 7% 47%	2600
December	1st to 10th	Night	24% 9% 3 7% 4 4 3 2 4 4 37%	4250
	11th to 20th	Night	18% 10% 3 4 3 2 2 2 4 5% 47%	4816
	21st to end	Night	16% 6% 2 4 2 2 2 2 3 4 56%	6490

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% 2 3 21% 19% 9%	4078
	11th to 20th	Day	36% 2 4 19% 24% 15%	4080
	21st to end	Day	51% 1 2 9% 22% 14%	4608
February	1st to 10th	Day	46% 2 5% 12% 20% 14%	2000
	11th to 20th	Day	46% 2 6% 18% 18% 10%	1959
	21st to end	Day	44% 2 7% 17% 17% 13%	1690
March	1st to 10th	Day	41% 1 5% 20% 15% 17%	4936
	11th to 20th	Day	40% 1 6% 10% 17% 26%	4980
	21st to end	Day	45% 2 7% 20% 19% 7%	5464
April	1st to 10th	Day	44% 3 7% 19% 15% 12%	2200
	11th to 20th	Day	46% 2 6% 16% 19% 10%	2203
	21st to end	Day	41% 3 6% 21% 20% 8%	2475
May	1st to 10th	Day	49% 4 9% 21% 13% 4	5900
	11th to 20th	Day	38% 3 12% 21% 21% 6%	5866
	21st to end	Day	43% 4 10% 29% 13% 2	6447
June	1st to 10th	Day	30% 4 15% 29% 20% 2	2600
	11th to 20th	Day	31% 5% 12% 28% 19% 4	2600
	21st to end	Day	39% 7% 14% 25% 14% 2	2600
July	1st to 10th	Day	40% 6% 22% 27% 4 1	5836
	11th to 20th	Day	33% 6% 21% 28% 10% 1	5831
	21st to end	Day	37% 6% 18% 25% 13% 1	6240
August	1st to 10th	Day	16% 4 12% 41% 26% 1	4220
	11th to 20th	Day	22% 5% 28% 34% 9% 2	4086
	21st to end	Day	31% 8% 19% 25% 15% 2	4018
September	1st to 10th	Day	38% 5% 10% 22% 17% 8%	2200
	11th to 20th	Day	40% 5% 12% 20% 19% 5%	2178
	21st to end	Day	34% 4 9% 22% 17% 15%	2090
October	1st to 10th	Day	17% 3 6% 14% 22% 39%	3466
	11th to 20th	Day	22% 2 7% 19% 31% 19%	3140
	21st to end	Day	28% 3 4 19% 30% 15%	3428
November	1st to 10th	Day	39% 2 8% 20% 20% 11%	1958
	11th to 20th	Day	34% 3 8% 17% 22% 16%	1960
	21st to end	Day	43% 3 6% 17% 18% 13%	1800
December	1st to 10th	Day	51% 2 6% 16% 17% 8%	2940
	11th to 20th	Day	44% 2 7% 12% 23% 12%	3389
	21st to end	Day	37% 2 4 17% 25% 14%	4488
January	1st to 10th	Night	41% 1 4 19% 22% 12%	5888
	11th to 20th	Night	30% 1 3 19% 31% 16%	5900
	21st to end	Night	51% 1 2 12% 19% 14%	6399
February	1st to 10th	Night	44% 2 5% 13% 19% 17%	2400
	11th to 20th	Night	42% 2 6% 17% 19% 13%	2338
	21st to end	Night	47% 1 5% 16% 18% 14%	1937
March	1st to 10th	Night	44% 2 6% 17% 17% 13%	4919
	11th to 20th	Night	42% 2 6% 13% 14% 23%	4980
	21st to end	Night	47% 2 7% 16% 18% 10%	5467
April	1st to 10th	Night	39% 4 9% 18% 17% 13%	2200
	11th to 20th	Night	40% 2 10% 17% 15% 15%	2143
	21st to end	Night	40% 3 8% 23% 18% 8%	1919
May	1st to 10th	Night	54% 3 7% 21% 11% 4	4080
	11th to 20th	Night	37% 3 12% 23% 19% 7%	4054
	21st to end	Night	43% 4 14% 29% 10% 1	4452
June	1st to 10th	Night	23% 4 19% 32% 21% 2	1800
	11th to 20th	Night	23% 5% 14% 34% 20% 4	1800
	21st to end	Night	30% 6% 17% 28% 16% 2	1800
July	1st to 10th	Night	38% 6% 27% 25% 4	4035
	11th to 20th	Night	27% 6% 24% 34% 9%	4026
	21st to end	Night	34% 7% 20% 26% 11% 3	4320
August	1st to 10th	Night	10% 4 17% 45% 23%	2916
	11th to 20th	Night	18% 5% 33% 34% 9% 1	3034
	21st to end	Night	22% 9% 25% 29% 12% 2	3880
September	1st to 10th	Night	30% 6% 18% 23% 16% 8%	2200
	11th to 20th	Night	34% 5% 15% 25% 15% 6%	2178
	21st to end	Night	29% 4 15% 20% 18% 14%	2090
October	1st to 10th	Night	14% 3 6% 17% 20% 40%	3480
	11th to 20th	Night	18% 2 8% 20% 32% 21%	3747
	21st to end	Night	22% 2 5% 24% 30% 17%	4120
November	1st to 10th	Night	34% 3 8% 20% 20% 14%	2340
	11th to 20th	Night	33% 3 9% 20% 20% 16%	2435
	21st to end	Night	39% 2 9% 19% 18% 14%	2600
December	1st to 10th	Night	52% 3 4 16% 17% 9%	4250
	11th to 20th	Night	42% 2 8% 10% 22% 16%	4817
	21st to end	Night	34% 2 4 17% 30% 13%	6490

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	23% 13% 34% 23% 6% 1	300
	11th to 20th	Day	25% 14% 27% 26% 6% 1	300
	21st to end	Day	27% 15% 32% 19% 7%	330
February	1st to 10th	Day	31% 13% 27% 21% 7% 1	300
	11th to 20th	Day	31% 18% 30% 16% 5%	300
	21st to end	Day	29% 17% 35% 16% 3	249
March	1st to 10th	Day	23% 16% 36% 19% 5% 1	300
	11th to 20th	Day	20% 17% 39% 17% 6% 1	300
	21st to end	Day	21% 13% 40% 18% 7% 1	330
April	1st to 10th	Day	24% 11% 39% 19% 5% 1	300
	11th to 20th	Day	22% 16% 32% 22% 8% 1	321
	21st to end	Day	21% 10% 34% 25% 8% 1	575
May	1st to 10th	Day	16% 9% 38% 28% 9%	703
	11th to 20th	Day	16% 7% 26% 33% 15% 3	725
	21st to end	Day	13% 6% 26% 33% 20% 3	789
June	1st to 10th	Day	6% 2 14% 38% 31% 9%	730
	11th to 20th	Day	8% 2 13% 43% 28% 7%	730
	21st to end	Day	7% 3 10% 34% 31% 16%	730
July	1st to 10th	Day	10% 4 6% 30% 37% 14%	721
	11th to 20th	Day	6% 1 5% 29% 45% 14%	718
	21st to end	Day	5% 3 5% 27% 46% 14%	794
August	1st to 10th	Day	2 1 2 26% 50% 17%	726
	11th to 20th	Day	5% 2 3 25% 47% 17%	643
	21st to end	Day	7% 3 3 23% 33% 31%	407
September	1st to 10th	Day	6% 1 7% 24% 39% 23%	330
	11th to 20th	Day	6% 1 6% 27% 39% 22%	324
	21st to end	Day	8% 1 5% 28% 41% 17%	300
October	1st to 10th	Day	4 1 12% 35% 38% 11%	300
	11th to 20th	Day	13% 3 19% 34% 25% 6%	300
	21st to end	Day	18% 8% 25% 23% 20% 6%	330
November	1st to 10th	Day	19% 7% 23% 30% 15% 6%	300
	11th to 20th	Day	20% 6% 24% 30% 17% 3	300
	21st to end	Day	23% 14% 31% 19% 10% 3	300
December	1st to 10th	Day	22% 7% 34% 21% 11% 5%	300
	11th to 20th	Day	25% 10% 30% 26% 8% 1	300
	21st to end	Day	24% 10% 35% 21% 8% 2	330
January	1st to 10th	Night	23% 9% 30% 30% 8%	1000
	11th to 20th	Night	22% 12% 29% 29% 8%	1000
	21st to end	Night	24% 9% 30% 31% 7%	1061
February	1st to 10th	Night	26% 11% 31% 28% 5%	800
	11th to 20th	Night	27% 10% 34% 26% 4	784
	21st to end	Night	28% 11% 38% 20% 3	617
March	1st to 10th	Night	24% 10% 38% 24% 4	600
	11th to 20th	Night	22% 10% 36% 30% 4	600
	21st to end	Night	18% 9% 42% 26% 4 1	660
April	1st to 10th	Night	16% 10% 43% 28% 3	600
	11th to 20th	Night	20% 9% 40% 25% 5%	593
	21st to end	Night	18% 9% 40% 25% 8% 1	600
May	1st to 10th	Night	17% 8% 43% 27% 4 1	600
	11th to 20th	Night	13% 7% 34% 35% 10% 1	591
	21st to end	Night	12% 4 31% 38% 14%	650
June	1st to 10th	Night	6% 2 18% 49% 25% 1	600
	11th to 20th	Night	6% 1 26% 51% 16% 1	600
	21st to end	Night	4 3 12% 46% 30% 4	600
July	1st to 10th	Night	6% 3 8% 48% 32% 3	585
	11th to 20th	Night	4 1 11% 48% 33% 3	582
	21st to end	Night	4 2 8% 50% 33% 4	657
August	1st to 10th	Night	1 8% 55% 34% 3	597
	11th to 20th	Night	5% 1 5% 53% 31% 6%	594
	21st to end	Night	4 1 4 40% 44% 7%	660
September	1st to 10th	Night	7% 2 8% 39% 40% 5%	600
	11th to 20th	Night	9% 3 6% 38% 40% 4	594
	21st to end	Night	11% 1 13% 35% 36% 4	570
October	1st to 10th	Night	4 1 11% 48% 31% 5%	570
	11th to 20th	Night	14% 3 20% 43% 18% 2	741
	21st to end	Night	13% 7% 26% 33% 19% 2	836
November	1st to 10th	Night	14% 4 23% 39% 20% 1	780
	11th to 20th	Night	13% 7% 25% 38% 15% 1	835
	21st to end	Night	20% 10% 28% 28% 14% 1	1000
December	1st to 10th	Night	22% 7% 27% 32% 12% 1	1000
	11th to 20th	Night	25% 9% 26% 31% 8% 1	1000
	21st to end	Night	21% 8% 31% 32% 8%	1100

Page generated at 2025-09-16 00:49:12. Version ac07

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