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 2024-11-05.

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	12% 6% 2 6% 4 4 4 4 6% 8% 44%	101031
	Night	13% 6% 2 5% 3 3 3 3 5% 7% 49%	98106
Transparency	Day	38% 3 10% 22% 18% 8%	104800
	Night	35% 3 11% 22% 19% 10%	102451
Seeing	Day	14% 6% 19% 28% 25% 8%	14843
	Night	15% 6% 25% 36% 16% 2	24721

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 5% 3 3 3 3 5% 6% 46%	2847
	11th to 20th	Day	18% 4 1 4 3 2 3 2 4 5% 53%	2850
	21st to end	Day	22% 9% 3 6% 2 2 3 2 4 7% 40%	3213
February	1st to 10th	Day	22% 7% 2 6% 3 3 3 3 4 5% 42%	1900
	11th to 20th	Day	20% 8% 2 6% 2 3 3 2 3 5% 44%	1849
	21st to end	Day	17% 7% 3 6% 4 3 3 2 4 4 45%	1608
March	1st to 10th	Day	16% 8% 2 8% 6% 5% 4 3 5% 7% 37%	3436
	11th to 20th	Day	20% 9% 3 7% 5% 5% 5% 4 5% 6% 31%	3480
	21st to end	Day	17% 8% 2 6% 3 4 3 3 4 7% 43%	3814
April	1st to 10th	Day	15% 8% 2 7% 4 4 4 4 5% 7% 40%	2090
	11th to 20th	Day	15% 8% 3 8% 5% 4 4 3 5% 5% 41%	2091
	21st to end	Day	15% 6% 2 6% 4 3 5% 3 5% 7% 44%	2351
May	1st to 10th	Day	20% 8% 3 8% 5% 5% 4 5% 5% 6% 31%	4082
	11th to 20th	Day	14% 7% 2 7% 4 4 4 4 5% 7% 41%	4082
	21st to end	Day	10% 6% 2 6% 5% 5% 6% 5% 8% 9% 38%	4477
June	1st to 10th	Day	5% 3 2 6% 3 5% 6% 5% 7% 9% 49%	2470
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 4 7% 9% 47%	2470
	21st to end	Day	6% 7% 2 6% 6% 6% 7% 6% 8% 10% 37%	2470
July	1st to 10th	Day	7% 5% 2 5% 5% 4 5% 5% 7% 10% 46%	4120
	11th to 20th	Day	5% 5% 2 6% 5% 6% 6% 5% 8% 13% 40%	4120
	21st to end	Day	10% 8% 3 7% 6% 6% 6% 5% 7% 11% 33%	4465
August	1st to 10th	Day	1 1 1 3 2 3 4 3 6% 10% 64%	4104
	11th to 20th	Day	3 2 1 3 3 4 5% 6% 8% 13% 52%	3921
	21st to end	Day	4 3 2 6% 5% 6% 6% 5% 9% 11% 44%	3896
September	1st to 10th	Day	6% 7% 2 7% 6% 5% 7% 4 5% 8% 43%	2090
	11th to 20th	Day	9% 6% 2 7% 6% 6% 6% 5% 7% 6% 40%	2090
	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% 7% 2 6% 3 4 3 3 6% 6% 46%	1898
	11th to 20th	Day	12% 5% 2 5% 3 3 5% 3 5% 5% 52%	1862
	21st to end	Day	18% 8% 2 5% 4 4 4 3 4 5% 43%	1710
December	1st to 10th	Day	16% 8% 2 7% 3 3 3 3 5% 6% 44%	1710
	11th to 20th	Day	18% 7% 2 6% 4 4 3 3 4 5% 43%	2161
	21st to end	Day	16% 7% 2 5% 3 3 2 3 4 5% 50%	3135
January	1st to 10th	Night	21% 7% 2 4 2 3 3 2 3 5% 50%	4108
	11th to 20th	Night	16% 5% 2 3 2 2 2 2 3 4 61%	4120
	21st to end	Night	22% 7% 3 6% 4 3 3 2 3 6% 42%	4469
February	1st to 10th	Night	20% 8% 3 5% 3 3 3 2 4 5% 45%	2280
	11th to 20th	Night	21% 7% 2 5% 3 2 2 3 4 5% 47%	2218
	21st to end	Night	21% 7% 2 5% 4 3 3 2 3 6% 43%	1843
March	1st to 10th	Night	21% 10% 2 5% 4 4 4 3 5% 6% 35%	3419
	11th to 20th	Night	25% 9% 3 7% 4 4 3 3 4 6% 31%	3480
	21st to end	Night	16% 7% 3 6% 4 4 4 3 4 5% 44%	3817
April	1st to 10th	Night	13% 7% 3 5% 5% 3 3 4 6% 7% 44%	2090
	11th to 20th	Night	18% 7% 2 5% 4 2 3 3 5% 7% 44%	2035
	21st to end	Night	15% 7% 2 6% 4 3 3 3 5% 6% 47%	1823
May	1st to 10th	Night	25% 8% 2 7% 4 3 3 4 5% 6% 33%	2823
	11th to 20th	Night	13% 6% 2 6% 4 3 4 4 5% 6% 47%	2823
	21st to end	Night	13% 7% 3 5% 4 4 4 4 6% 9% 42%	3090
June	1st to 10th	Night	5% 2 1 3 4 3 3 3 6% 10% 59%	1710
	11th to 20th	Night	5% 2 1 4 3 3 4 5% 6% 10% 57%	1710
	21st to end	Night	5% 5% 2 5% 5% 4 5% 4 8% 10% 48%	1710
July	1st to 10th	Night	5% 3 1 4 4 4 4 4 6% 12% 53%	2850
	11th to 20th	Night	3 4 2 5% 3 4 5% 3 6% 11% 52%	2850
	21st to end	Night	8% 6% 3 7% 5% 4 5% 4 6% 11% 41%	3098
August	1st to 10th	Night	1 1 2 2 2 3 3 5% 9% 72%	2836
	11th to 20th	Night	2 2 1 3 3 3 4 3 8% 12% 59%	2913
	21st to end	Night	3 3 1 3 3 4 4 4 8% 12% 54%	3761
September	1st to 10th	Night	6% 5% 2 5% 5% 4 4 3 6% 9% 51%	2090
	11th to 20th	Night	8% 6% 2 6% 5% 4 5% 3 6% 8% 46%	2090
	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	12% 5% 2 5% 4 4 3 3 5% 5% 52%	2280
	11th to 20th	Night	11% 6% 1 4 4 4 4 2 4 7% 52%	2313
	21st to end	Night	18% 6% 2 4 4 3 4 3 4 7% 45%	2470
December	1st to 10th	Night	17% 7% 2 5% 4 4 3 3 4 4 48%	2470
	11th to 20th	Night	18% 9% 3 5% 3 3 3 3 4 6% 44%	3036
	21st to end	Night	17% 7% 2 4 3 2 3 2 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	54% 2 10% 17% 12% 5%	4120
	11th to 20th	Day	43% 3 9% 19% 21% 5%	4086
	21st to end	Day	41% 3 10% 34% 11% 1	4489
June	1st to 10th	Day	31% 4 14% 29% 20% 2	2470
	11th to 20th	Day	31% 5% 12% 28% 19% 5%	2470
	21st to end	Day	40% 7% 13% 25% 14% 2	2470
July	1st to 10th	Day	32% 6% 21% 35% 6% 1	4056
	11th to 20th	Day	34% 6% 18% 27% 14% 1	4051
	21st to end	Day	42% 6% 19% 25% 7% 1	4325
August	1st to 10th	Day	16% 4 12% 41% 26% 1	4090
	11th to 20th	Day	22% 5% 28% 34% 10% 2	3960
	21st to end	Day	31% 8% 18% 25% 16% 2	3895
September	1st to 10th	Day	38% 5% 11% 22% 16% 8%	2090
	11th to 20th	Day	41% 6% 11% 18% 19% 5%	2090
	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% 21% 10%	1898
	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	54% 2 8% 20% 12% 5%	2850
	11th to 20th	Night	39% 2 10% 22% 18% 8%	2824
	21st to end	Night	40% 3 14% 32% 11% 1	3099
June	1st to 10th	Night	23% 4 19% 31% 21% 3	1710
	11th to 20th	Night	22% 4 15% 34% 20% 5%	1710
	21st to end	Night	30% 6% 16% 29% 16% 2	1710
July	1st to 10th	Night	26% 5% 28% 36% 5%	2805
	11th to 20th	Night	27% 6% 22% 33% 13%	2796
	21st to end	Night	38% 6% 24% 26% 6%	2999
August	1st to 10th	Night	10% 4 17% 45% 24%	2826
	11th to 20th	Night	18% 5% 32% 34% 9% 1	2940
	21st to end	Night	22% 9% 25% 29% 13% 2	3761
September	1st to 10th	Night	30% 6% 18% 23% 16% 7%	2090
	11th to 20th	Night	35% 5% 15% 24% 15% 6%	2090
	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 9% 21% 21% 13%	2280
	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% 38% 29% 9%	653
	11th to 20th	Day	16% 7% 24% 34% 16% 3	675
	21st to end	Day	13% 5% 25% 33% 21% 3	734
June	1st to 10th	Day	6% 2 12% 38% 33% 10%	680
	11th to 20th	Day	8% 1 12% 43% 29% 8%	680
	21st to end	Day	7% 2 10% 34% 31% 15%	680
July	1st to 10th	Day	9% 3 5% 29% 38% 15%	671
	11th to 20th	Day	5% 1 3 28% 47% 15%	668
	21st to end	Day	5% 3 4 27% 47% 14%	739
August	1st to 10th	Day	3 1 3 26% 50% 18%	676
	11th to 20th	Day	5% 3 3 24% 49% 17%	597
	21st to end	Day	8% 3 3 22% 31% 32%	372
September	1st to 10th	Day	6% 1 6% 23% 39% 25%	300
	11th to 20th	Day	6% 1 6% 26% 40% 22%	300
	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	20% 7% 22% 30% 16% 6%	282
	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% 7% 44% 27% 4 1	570
	11th to 20th	Night	14% 5% 34% 36% 10% 1	561
	21st to end	Night	11% 4 31% 39% 14%	617
June	1st to 10th	Night	5% 2 17% 49% 26% 1	570
	11th to 20th	Night	5% 1 25% 51% 16% 1	570
	21st to end	Night	4 4 12% 46% 30% 4	570
July	1st to 10th	Night	6% 2 8% 48% 32% 4	555
	11th to 20th	Night	4 11% 48% 34% 3	552
	21st to end	Night	4 1 8% 51% 33% 4	624
August	1st to 10th	Night	1 7% 56% 33% 3	567
	11th to 20th	Night	5% 1 5% 53% 30% 5%	564
	21st to end	Night	4 1 5% 40% 43% 7%	627
September	1st to 10th	Night	7% 2 7% 39% 40% 5%	570
	11th to 20th	Night	10% 3 6% 37% 40% 4	570
	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	13% 4 23% 39% 20% 1	760
	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 2024-11-03 01:11:22. Version ac07

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