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 2024-05-10.

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	13% 6% 2 5% 5% 3 5% 5% 5% 7% 44%	83985
	Night	14% 6% 2 4 4 2 3 4 5% 7% 49%	85504
Transparency	Day	40% 3 10% 20% 19% 8%	83710
	Night	36% 3 10% 21% 19% 10%	85299
Seeing	Day	14% 6% 19% 27% 25% 8%	14103
	Night	15% 6% 25% 35% 16% 2	24158

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% 9% 2 4 4 2 3 4 5% 6% 46%	2847
	11th to 20th	Day	18% 4 2 3 3 2 3 2 4 5% 53%	2850
	21st to end	Day	22% 8% 3 5% 3 2 3 3 4 7% 40%	3213
February	1st to 10th	Day	22% 7% 2 5% 4 2 3 4 4 5% 42%	1900
	11th to 20th	Day	21% 7% 2 6% 3 3 3 3 3 5% 44%	1849
	21st to end	Day	18% 7% 3 5% 5% 2 3 3 4 5% 46%	1608
March	1st to 10th	Day	16% 8% 2 7% 7% 3 4 4 4 7% 37%	3436
	11th to 20th	Day	20% 8% 4 6% 6% 4 5% 4 5% 6% 31%	3480
	21st to end	Day	17% 7% 3 5% 4 3 3 4 4 7% 43%	3814
April	1st to 10th	Day	15% 7% 3 6% 5% 3 4 5% 5% 7% 40%	2090
	11th to 20th	Day	15% 8% 3 6% 6% 3 5% 3 4 5% 41%	2091
	21st to end	Day	16% 5% 3 5% 4 2 4 4 5% 7% 45%	2351
May	1st to 10th	Day	14% 6% 3 6% 6% 3 5% 5% 5% 7% 39%	2458
	11th to 20th	Day	11% 7% 2 6% 6% 3 5% 5% 6% 8% 40%	2302
	21st to end	Day	12% 6% 3 7% 6% 5% 6% 6% 6% 9% 34%	2531
June	1st to 10th	Day	5% 3 2 5% 4 4 6% 6% 7% 9% 49%	2340
	11th to 20th	Day	6% 3 2 5% 5% 3 6% 6% 7% 10% 48%	2340
	21st to end	Day	6% 5% 3 6% 6% 5% 8% 8% 8% 9% 36%	2340
July	1st to 10th	Day	9% 6% 3 5% 7% 5% 6% 7% 7% 10% 36%	2340
	11th to 20th	Day	4 3 2 4 6% 4 8% 7% 8% 13% 43%	2340
	21st to end	Day	4 3 2 4 5% 4 6% 6% 7% 13% 47%	2546
August	1st to 10th	Day	2 2 2 3 4 3 5% 5% 6% 10% 56%	2328
	11th to 20th	Day	6% 3 2 4 5% 4 6% 7% 7% 10% 47%	2237
	21st to end	Day	6% 4 2 6% 6% 4 7% 7% 8% 11% 40%	2218
September	1st to 10th	Day	6% 6% 3 6% 7% 4 7% 6% 5% 8% 43%	1980
	11th to 20th	Day	10% 6% 2 6% 7% 5% 6% 7% 6% 6% 39%	1980
	21st to end	Day	6% 5% 2 5% 5% 3 6% 6% 6% 8% 47%	1980
October	1st to 10th	Day	5% 3 2 4 4 3 4 6% 5% 7% 55%	1980
	11th to 20th	Day	15% 4 2 4 4 2 4 3 3 6% 52%	1800
	21st to end	Day	12% 5% 2 5% 3 2 3 3 3 5% 57%	1980
November	1st to 10th	Day	13% 6% 2 5% 4 3 3 4 6% 6% 48%	1858
	11th to 20th	Day	12% 5% 2 5% 3 3 5% 3 5% 5% 52%	1862
	21st to end	Day	18% 7% 3 5% 5% 3 4 4 4 5% 43%	1710
December	1st to 10th	Day	16% 7% 3 6% 4 3 3 4 5% 6% 44%	1710
	11th to 20th	Day	18% 6% 3 6% 5% 3 4 3 3 5% 44%	2161
	21st to end	Day	16% 7% 2 4 4 3 3 3 4 5% 50%	3135
January	1st to 10th	Night	21% 7% 2 3 2 2 3 3 3 5% 50%	4108
	11th to 20th	Night	16% 5% 2 3 2 2 2 2 2 4 61%	4120
	21st to end	Night	22% 6% 3 5% 4 2 3 3 3 6% 42%	4469
February	1st to 10th	Night	21% 7% 3 4 4 2 3 3 4 5% 45%	2280
	11th to 20th	Night	21% 7% 2 4 4 2 2 3 3 5% 47%	2218
	21st to end	Night	21% 7% 3 4 4 3 4 3 3 6% 43%	1843
March	1st to 10th	Night	21% 10% 2 5% 5% 3 4 4 5% 6% 36%	3419
	11th to 20th	Night	26% 8% 3 6% 5% 3 4 4 4 6% 31%	3480
	21st to end	Night	16% 7% 3 5% 5% 3 4 4 4 5% 44%	3817
April	1st to 10th	Night	13% 6% 3 5% 5% 3 3 4 6% 7% 45%	2090
	11th to 20th	Night	18% 6% 2 4 5% 2 3 3 4 8% 44%	2035
	21st to end	Night	15% 6% 3 5% 4 2 3 3 5% 6% 47%	1823
May	1st to 10th	Night	14% 7% 2 6% 5% 3 4 5% 6% 8% 42%	1706
	11th to 20th	Night	12% 5% 2 5% 5% 3 4 5% 5% 7% 48%	1593
	21st to end	Night	10% 4 3 4 4 2 5% 5% 6% 10% 47%	1745
June	1st to 10th	Night	4 2 1 3 4 2 3 4 6% 11% 59%	1620
	11th to 20th	Night	4 2 1 3 4 2 5% 5% 6% 10% 58%	1620
	21st to end	Night	5% 4 2 4 5% 3 5% 5% 8% 10% 48%	1620
July	1st to 10th	Night	7% 4 2 4 5% 3 5% 5% 7% 11% 47%	1620
	11th to 20th	Night	3 2 1 2 3 3 4 5% 6% 10% 62%	1620
	21st to end	Night	3 2 1 3 3 2 5% 4 5% 13% 58%	1772
August	1st to 10th	Night	1 1 2 2 2 3 4 6% 11% 68%	1611
	11th to 20th	Night	4 4 2 4 4 3 4 5% 8% 11% 52%	1659
	21st to end	Night	4 3 1 3 5% 4 5% 6% 8% 12% 49%	2137
September	1st to 10th	Night	6% 4 2 4 5% 3 5% 4 6% 10% 51%	1980
	11th to 20th	Night	8% 6% 2 5% 5% 3 5% 4 6% 8% 46%	1980
	21st to end	Night	8% 4 2 4 5% 3 4 4 6% 8% 52%	1980
October	1st to 10th	Night	3 3 2 3 3 2 3 4 5% 7% 64%	1980
	11th to 20th	Night	12% 5% 2 3 3 3 3 3 5% 5% 56%	2142
	21st to end	Night	14% 4 1 3 3 1 3 3 3 5% 60%	2376
November	1st to 10th	Night	12% 4 2 4 4 3 3 4 4 6% 54%	2220
	11th to 20th	Night	11% 6% 2 4 4 3 4 3 4 7% 52%	2313
	21st to end	Night	18% 6% 3 4 5% 2 3 3 4 7% 45%	2470
December	1st to 10th	Night	17% 6% 3 5% 4 3 4 3 4 5% 48%	2470
	11th to 20th	Night	18% 8% 3 4 4 2 3 3 4 6% 44%	3036
	21st to end	Night	17% 6% 2 4 3 2 3 3 4 5% 52%	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	42% 1 3 18% 23% 12%	2848
	11th to 20th	Day	35% 1 5% 19% 27% 11%	2850
	21st to end	Day	47% 1 3 11% 26% 11%	3213
February	1st to 10th	Day	47% 2 6% 13% 20% 14%	1900
	11th to 20th	Day	45% 2 6% 18% 18% 11%	1859
	21st to end	Day	43% 2 7% 17% 17% 14%	1608
March	1st to 10th	Day	49% 1 7% 18% 17% 8%	3436
	11th to 20th	Day	56% 2 8% 10% 16% 8%	3480
	21st to end	Day	44% 2 8% 17% 23% 7%	3814
April	1st to 10th	Day	44% 3 7% 19% 15% 12%	2090
	11th to 20th	Day	47% 2 6% 16% 18% 10%	2091
	21st to end	Day	41% 3 6% 22% 21% 8%	2351
May	1st to 10th	Day	45% 4 9% 18% 16% 9%	2458
	11th to 20th	Day	41% 4 10% 22% 18% 5%	2306
	21st to end	Day	44% 5% 11% 24% 14% 2	2531
June	1st to 10th	Day	31% 4 15% 28% 20% 2	2340
	11th to 20th	Day	31% 5% 13% 29% 18% 4	2340
	21st to end	Day	41% 7% 13% 24% 13% 2	2340
July	1st to 10th	Day	41% 6% 17% 25% 10% 1	2276
	11th to 20th	Day	31% 6% 20% 26% 17% 2	2271
	21st to end	Day	26% 5% 23% 33% 11% 1	2405
August	1st to 10th	Day	23% 4 17% 37% 18% 1	2314
	11th to 20th	Day	31% 5% 19% 29% 12% 3	2237
	21st to end	Day	34% 6% 18% 27% 11% 3	2218
September	1st to 10th	Day	38% 5% 11% 23% 16% 7%	1980
	11th to 20th	Day	42% 6% 12% 18% 17% 5%	1980
	21st to end	Day	35% 4 9% 22% 17% 13%	1980
October	1st to 10th	Day	28% 4 10% 24% 23% 12%	1980
	11th to 20th	Day	37% 2 5% 17% 22% 17%	1800
	21st to end	Day	33% 2 4 16% 26% 20%	1980
November	1st to 10th	Day	38% 2 7% 21% 21% 11%	1858
	11th to 20th	Day	35% 3 9% 18% 22% 14%	1862
	21st to end	Day	44% 3 5% 16% 18% 13%	1710
December	1st to 10th	Day	43% 2 8% 19% 20% 7%	1710
	11th to 20th	Day	45% 1 6% 13% 23% 12%	2159
	21st to end	Day	40% 1 5% 16% 26% 13%	3135
January	1st to 10th	Night	40% 1 5% 16% 21% 16%	4108
	11th to 20th	Night	31% 1 4 17% 32% 15%	4120
	21st to end	Night	47% 1 3 14% 24% 11%	4469
February	1st to 10th	Night	45% 2 5% 13% 19% 16%	2280
	11th to 20th	Night	42% 2 6% 17% 19% 14%	2218
	21st to end	Night	46% 1 5% 16% 17% 14%	1843
March	1st to 10th	Night	51% 2 7% 16% 15% 8%	3419
	11th to 20th	Night	56% 2 9% 14% 13% 7%	3480
	21st to end	Night	44% 2 8% 14% 22% 10%	3817
April	1st to 10th	Night	39% 4 9% 19% 17% 12%	2090
	11th to 20th	Night	40% 2 10% 17% 15% 15%	2035
	21st to end	Night	40% 2 8% 23% 19% 8%	1823
May	1st to 10th	Night	42% 3 10% 20% 16% 8%	1706
	11th to 20th	Night	35% 4 12% 27% 18% 4	1594
	21st to end	Night	33% 4 17% 31% 14% 1	1746
June	1st to 10th	Night	22% 4 19% 31% 22% 3	1620
	11th to 20th	Night	22% 4 15% 35% 20% 4	1620
	21st to end	Night	30% 6% 17% 29% 16% 2	1620
July	1st to 10th	Night	31% 5% 24% 30% 9%	1575
	11th to 20th	Night	18% 5% 26% 35% 15% 1	1566
	21st to end	Night	19% 5% 29% 38% 9%	1673
August	1st to 10th	Night	12% 4 27% 39% 18% 1	1601
	11th to 20th	Night	24% 7% 24% 32% 10% 2	1659
	21st to end	Night	26% 8% 24% 28% 10% 4	2137
September	1st to 10th	Night	29% 6% 18% 24% 16% 7%	1980
	11th to 20th	Night	35% 5% 16% 23% 15% 6%	1980
	21st to end	Night	30% 4 15% 20% 18% 13%	1980
October	1st to 10th	Night	21% 3 10% 29% 24% 13%	1980
	11th to 20th	Night	31% 3 8% 19% 21% 18%	2142
	21st to end	Night	30% 2 6% 19% 22% 23%	2376
November	1st to 10th	Night	33% 3 9% 21% 21% 13%	2220
	11th to 20th	Night	34% 3 9% 20% 20% 14%	2313
	21st to end	Night	41% 1 8% 18% 17% 14%	2470
December	1st to 10th	Night	41% 2 6% 22% 18% 11%	2470
	11th to 20th	Night	43% 1 6% 13% 21% 16%	3037
	21st to end	Night	37% 2 5% 16% 29% 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	21% 11% 34% 24% 7% 1	270
	11th to 20th	Day	26% 11% 28% 26% 7% 1	270
	21st to end	Day	25% 14% 33% 20% 7%	297
February	1st to 10th	Day	33% 14% 26% 19% 7% 1	270
	11th to 20th	Day	29% 18% 30% 17% 6%	270
	21st to end	Day	29% 17% 36% 16% 2	225
March	1st to 10th	Day	23% 14% 38% 19% 6% 1	270
	11th to 20th	Day	21% 14% 39% 19% 7% 1	270
	21st to end	Day	21% 13% 39% 18% 8% 1	297
April	1st to 10th	Day	24% 11% 39% 20% 5% 1	270
	11th to 20th	Day	22% 15% 32% 21% 8% 1	289
	21st to end	Day	21% 10% 34% 26% 9% 1	531
May	1st to 10th	Day	16% 8% 37% 29% 9%	649
	11th to 20th	Day	15% 7% 24% 34% 16% 3	625
	21st to end	Day	14% 5% 23% 33% 22% 3	679
June	1st to 10th	Day	6% 1 11% 37% 33% 10%	630
	11th to 20th	Day	7% 1 11% 44% 29% 8%	630
	21st to end	Day	7% 2 10% 33% 32% 16%	630
July	1st to 10th	Day	9% 3 5% 29% 38% 16%	621
	11th to 20th	Day	3 1 3 28% 49% 15%	618
	21st to end	Day	3 2 3 27% 50% 15%	684
August	1st to 10th	Day	3 2 2 26% 50% 18%	626
	11th to 20th	Day	6% 3 3 23% 49% 17%	551
	21st to end	Day	8% 3 3 20% 31% 34%	337
September	1st to 10th	Day	6% 1 2 21% 43% 27%	270
	11th to 20th	Day	6% 1 5% 25% 41% 21%	270
	21st to end	Day	9% 1 4 26% 42% 17%	270
October	1st to 10th	Day	4 1 13% 31% 39% 11%	270
	11th to 20th	Day	15% 3 17% 32% 26% 7%	270
	21st to end	Day	21% 8% 26% 22% 18% 5%	297
November	1st to 10th	Day	19% 6% 21% 31% 17% 7%	270
	11th to 20th	Day	21% 7% 23% 31% 15% 3	270
	21st to end	Day	24% 13% 31% 20% 10% 2	270
December	1st to 10th	Day	20% 6% 35% 22% 12% 5%	270
	11th to 20th	Day	25% 11% 29% 26% 7% 1	270
	21st to end	Day	24% 10% 36% 21% 7% 2	297
January	1st to 10th	Night	22% 8% 30% 31% 8%	950
	11th to 20th	Night	23% 11% 28% 30% 8%	950
	21st to end	Night	22% 9% 30% 32% 7%	1008
February	1st to 10th	Night	25% 11% 30% 29% 5%	760
	11th to 20th	Night	26% 9% 34% 27% 4	744
	21st to end	Night	27% 11% 40% 19% 3	587
March	1st to 10th	Night	23% 9% 39% 24% 4	570
	11th to 20th	Night	22% 9% 35% 31% 4	570
	21st to end	Night	17% 10% 43% 26% 4 1	627
April	1st to 10th	Night	15% 10% 44% 28% 3	570
	11th to 20th	Night	20% 9% 40% 26% 6%	563
	21st to end	Night	18% 8% 40% 25% 8% 1	570
May	1st to 10th	Night	17% 8% 43% 28% 4 1	569
	11th to 20th	Night	13% 5% 34% 36% 11% 1	531
	21st to end	Night	11% 4 29% 40% 15% 1	584
June	1st to 10th	Night	5% 2 16% 51% 26% 1	540
	11th to 20th	Night	5% 1 25% 51% 16% 1	540
	21st to end	Night	4 3 11% 47% 30% 5%	540
July	1st to 10th	Night	6% 2 8% 48% 32% 4	525
	11th to 20th	Night	3 10% 48% 35% 3	522
	21st to end	Night	3 1 7% 52% 34% 4	591
August	1st to 10th	Night	1 7% 57% 32% 3	537
	11th to 20th	Night	5% 1 5% 52% 31% 6%	534
	21st to end	Night	5% 1 5% 40% 43% 7%	594
September	1st to 10th	Night	7% 2 5% 39% 42% 5%	540
	11th to 20th	Night	10% 2 6% 37% 41% 4	540
	21st to end	Night	11% 1 12% 34% 37% 4	540
October	1st to 10th	Night	4 1 12% 47% 30% 5%	540
	11th to 20th	Night	15% 4 19% 42% 19% 2	702
	21st to end	Night	14% 7% 25% 32% 19% 2	792
November	1st to 10th	Night	12% 3 23% 40% 21% 1	740
	11th to 20th	Night	14% 7% 24% 38% 16% 1	793
	21st to end	Night	20% 9% 27% 28% 14% 1	950
December	1st to 10th	Night	21% 6% 28% 32% 13% 1	950
	11th to 20th	Night	25% 9% 27% 31% 8% 1	950
	21st to end	Night	21% 8% 31% 33% 8%	1045

Page generated at 2024-05-07 06:25:01. Version ac07

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