Monument Hill & Kreische Brewery State Historic Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Monument Hill & Kreische Brewery State Historic Site 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% 43%	126204
	Night	14% 7% 2 5% 4 3 3 3 5% 7% 47%	123132
Transparency	Day	37% 6% 11% 20% 17% 9%	129934
	Night	35% 5% 11% 20% 17% 11%	127465
Seeing	Day	13% 7% 19% 27% 25% 10%	16012
	Night	15% 7% 24% 35% 18% 2	25831

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	19% 10% 3 6% 3 3 3 2 3 4 42%	4077
	11th to 20th	Day	14% 6% 2 5% 3 3 4 3 4 5% 50%	4080
	21st to end	Day	30% 8% 2 5% 3 2 2 2 4 5% 37%	4561
February	1st to 10th	Day	21% 8% 3 6% 4 2 3 2 4 5% 43%	2000
	11th to 20th	Day	21% 8% 2 7% 3 3 3 3 4 4 41%	1949
	21st to end	Day	18% 8% 3 7% 3 3 3 3 4 6% 43%	1718
March	1st to 10th	Day	13% 6% 3 6% 5% 4 4 3 5% 7% 44%	4936
	11th to 20th	Day	13% 7% 2 6% 5% 4 3 3 4 6% 47%	4980
	21st to end	Day	17% 8% 3 6% 4 4 3 3 5% 5% 41%	5462
April	1st to 10th	Day	14% 9% 3 7% 4 5% 4 3 5% 6% 40%	2200
	11th to 20th	Day	15% 7% 3 7% 5% 4 4 3 5% 5% 40%	2222
	21st to end	Day	13% 7% 3 7% 4 5% 4 3 6% 6% 43%	2428
May	1st to 10th	Day	17% 7% 3 8% 4 4 5% 4 6% 8% 33%	5862
	11th to 20th	Day	9% 6% 2 7% 4 5% 5% 4 6% 8% 44%	5862
	21st to end	Day	10% 6% 2 6% 6% 6% 6% 5% 8% 10% 36%	6434
June	1st to 10th	Day	6% 3 2 6% 5% 6% 5% 4 7% 9% 47%	2600
	11th to 20th	Day	5% 4 2 5% 5% 5% 6% 5% 8% 10% 45%	2600
	21st to end	Day	5% 5% 3 7% 7% 7% 8% 6% 9% 9% 34%	2600
July	1st to 10th	Day	9% 6% 2 7% 6% 6% 5% 5% 7% 10% 37%	5900
	11th to 20th	Day	6% 5% 2 6% 5% 5% 6% 5% 8% 13% 38%	5900
	21st to end	Day	9% 6% 2 6% 5% 5% 5% 5% 8% 12% 37%	6422
August	1st to 10th	Day	1 1 3 3 4 4 4 6% 10% 63%	4234
	11th to 20th	Day	3 2 1 4 3 4 6% 5% 9% 14% 50%	4107
	21st to end	Day	4 4 1 6% 5% 6% 6% 6% 8% 11% 42%	3964
September	1st to 10th	Day	7% 5% 2 7% 6% 5% 6% 5% 6% 9% 43%	2200
	11th to 20th	Day	9% 6% 3 8% 5% 6% 5% 4 6% 7% 42%	2178
	21st to end	Day	6% 5% 2 6% 4 5% 6% 4 5% 8% 49%	2090
October	1st to 10th	Day	6% 3 1 5% 4 4 4 3 5% 8% 56%	2071
	11th to 20th	Day	12% 5% 2 5% 3 3 4 2 5% 6% 52%	1900
	21st to end	Day	13% 4 2 5% 3 3 4 3 4 5% 55%	2090
November	1st to 10th	Day	13% 7% 2 6% 4 3 4 3 5% 7% 46%	1958
	11th to 20th	Day	11% 6% 3 4 3 3 3 4 4 6% 52%	2000
	21st to end	Day	16% 7% 3 6% 3 4 4 3 5% 7% 43%	1800
December	1st to 10th	Day	26% 8% 2 7% 3 3 3 3 4 5% 36%	2940
	11th to 20th	Day	16% 9% 2 6% 4 4 3 3 4 5% 43%	3391
	21st to end	Day	13% 8% 2 5% 3 3 3 2 3 5% 51%	4488
January	1st to 10th	Night	20% 8% 2 5% 3 3 2 2 3 5% 47%	5888
	11th to 20th	Night	13% 6% 2 4 3 3 3 2 3 5% 57%	5900
	21st to end	Night	31% 7% 2 4 3 3 2 2 3 5% 38%	6447
February	1st to 10th	Night	19% 10% 3 5% 3 3 3 3 4 5% 43%	2400
	11th to 20th	Night	22% 7% 2 5% 3 3 2 2 4 6% 44%	2338
	21st to end	Night	23% 7% 2 6% 4 3 3 3 4 5% 41%	1910
March	1st to 10th	Night	17% 10% 2 5% 3 3 4 3 5% 7% 40%	4919
	11th to 20th	Night	18% 8% 3 5% 3 3 3 3 4 5% 46%	4980
	21st to end	Night	19% 11% 2 6% 4 3 3 2 4 5% 41%	5467
April	1st to 10th	Night	13% 7% 2 5% 3 3 4 4 6% 8% 44%	2200
	11th to 20th	Night	15% 8% 2 6% 4 3 3 3 5% 6% 44%	2124
	21st to end	Night	15% 7% 2 6% 4 3 4 3 5% 6% 45%	1967
May	1st to 10th	Night	22% 10% 3 7% 4 4 4 3 5% 7% 30%	4053
	11th to 20th	Night	10% 6% 2 6% 4 4 4 4 5% 9% 46%	4053
	21st to end	Night	10% 8% 3 7% 5% 5% 5% 5% 7% 9% 35%	4443
June	1st to 10th	Night	4 3 2 4 4 4 3 3 6% 11% 56%	1800
	11th to 20th	Night	4 3 1 5% 3 3 4 5% 7% 12% 54%	1800
	21st to end	Night	4 5% 1 5% 5% 5% 6% 5% 9% 10% 46%	1800
July	1st to 10th	Night	7% 6% 2 6% 5% 4 5% 5% 7% 10% 43%	4078
	11th to 20th	Night	5% 4 2 5% 4 4 5% 5% 6% 10% 51%	4077
	21st to end	Night	7% 6% 2 6% 4 5% 5% 4 6% 11% 44%	4449
August	1st to 10th	Night	1 1 2 2 2 2 3 5% 9% 73%	2926
	11th to 20th	Night	2 2 1 2 2 3 5% 4 8% 12% 58%	2945
	21st to end	Night	3 3 2 4 4 4 4 5% 9% 12% 52%	3931
September	1st to 10th	Night	6% 5% 3 5% 4 4 5% 4 6% 9% 50%	2200
	11th to 20th	Night	8% 6% 2 6% 4 4 5% 3 6% 9% 48%	2178
	21st to end	Night	8% 4 2 6% 3 3 4 3 6% 8% 54%	2090
October	1st to 10th	Night	4 4 1 4 3 3 3 2 5% 8% 64%	2090
	11th to 20th	Night	11% 4 1 4 3 3 3 2 4 6% 59%	2280
	21st to end	Night	11% 5% 2 4 3 2 3 2 3 5% 60%	2508
November	1st to 10th	Night	10% 5% 2 6% 4 4 4 3 5% 6% 51%	2340
	11th to 20th	Night	10% 6% 2 5% 5% 3 3 3 5% 5% 52%	2400
	21st to end	Night	15% 7% 2 5% 4 3 4 3 4 7% 47%	2595
December	1st to 10th	Night	24% 10% 3 6% 4 3 3 2 4 5% 35%	4250
	11th to 20th	Night	16% 9% 3 5% 3 3 3 2 4 5% 47%	4816
	21st to end	Night	15% 6% 2 5% 3 2 2 2 3 5% 55%	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	46% 4 5% 20% 18% 8%	4078
	11th to 20th	Day	37% 3 5% 18% 23% 15%	4080
	21st to end	Day	51% 2 3 9% 20% 14%	4561
February	1st to 10th	Day	45% 4 5% 13% 18% 14%	2000
	11th to 20th	Day	47% 4 7% 15% 16% 11%	1959
	21st to end	Day	44% 5% 8% 15% 16% 13%	1718
March	1st to 10th	Day	38% 5% 7% 19% 15% 16%	4936
	11th to 20th	Day	39% 5% 5% 9% 17% 25%	4980
	21st to end	Day	45% 4 7% 18% 19% 7%	5464
April	1st to 10th	Day	45% 5% 7% 17% 15% 12%	2200
	11th to 20th	Day	45% 6% 8% 14% 18% 10%	2222
	21st to end	Day	41% 5% 8% 20% 19% 8%	2428
May	1st to 10th	Day	47% 7% 10% 21% 12% 4	5900
	11th to 20th	Day	36% 7% 12% 20% 20% 6%	5866
	21st to end	Day	38% 9% 12% 27% 13% 2	6447
June	1st to 10th	Day	30% 9% 14% 26% 18% 2	2600
	11th to 20th	Day	31% 9% 14% 24% 18% 4	2600
	21st to end	Day	40% 12% 14% 22% 11% 1	2600
July	1st to 10th	Day	39% 8% 24% 24% 4	5836
	11th to 20th	Day	35% 9% 22% 26% 9%	5831
	21st to end	Day	37% 8% 19% 25% 10% 1	6240
August	1st to 10th	Day	16% 6% 13% 43% 22% 1	4220
	11th to 20th	Day	22% 9% 30% 31% 7% 2	4146
	21st to end	Day	32% 11% 19% 24% 12% 2	3963
September	1st to 10th	Day	36% 10% 13% 20% 15% 7%	2200
	11th to 20th	Day	38% 8% 13% 19% 17% 4	2178
	21st to end	Day	32% 7% 11% 21% 16% 14%	2090
October	1st to 10th	Day	17% 4 6% 12% 21% 39%	3448
	11th to 20th	Day	21% 4 7% 19% 32% 17%	3140
	21st to end	Day	29% 4 5% 19% 28% 15%	3428
November	1st to 10th	Day	37% 6% 10% 17% 20% 11%	1958
	11th to 20th	Day	33% 5% 10% 17% 20% 15%	2000
	21st to end	Day	42% 5% 8% 16% 17% 12%	1800
December	1st to 10th	Day	52% 3 6% 15% 18% 6%	2940
	11th to 20th	Day	43% 5% 7% 11% 23% 11%	3389
	21st to end	Day	37% 3 5% 18% 23% 13%	4488
January	1st to 10th	Night	41% 3 5% 19% 20% 11%	5888
	11th to 20th	Night	32% 2 5% 20% 27% 15%	5900
	21st to end	Night	51% 3 3 11% 19% 14%	6447
February	1st to 10th	Night	45% 4 6% 12% 19% 15%	2400
	11th to 20th	Night	43% 4 6% 16% 18% 13%	2338
	21st to end	Night	47% 3 6% 14% 16% 14%	1910
March	1st to 10th	Night	44% 5% 8% 15% 17% 12%	4919
	11th to 20th	Night	41% 5% 6% 13% 14% 22%	4980
	21st to end	Night	46% 4 7% 16% 18% 10%	5467
April	1st to 10th	Night	37% 7% 11% 18% 17% 11%	2200
	11th to 20th	Night	41% 4 10% 15% 15% 15%	2124
	21st to end	Night	40% 5% 10% 20% 17% 8%	1967
May	1st to 10th	Night	53% 6% 8% 19% 10% 4	4080
	11th to 20th	Night	35% 6% 12% 23% 17% 7%	4054
	21st to end	Night	41% 8% 14% 27% 8% 1	4452
June	1st to 10th	Night	23% 7% 18% 32% 19% 2	1800
	11th to 20th	Night	23% 7% 15% 33% 18% 4	1800
	21st to end	Night	29% 10% 18% 28% 13% 2	1800
July	1st to 10th	Night	36% 8% 29% 24% 3	4035
	11th to 20th	Night	28% 7% 24% 32% 9%	4026
	21st to end	Night	34% 8% 20% 26% 10% 2	4320
August	1st to 10th	Night	9% 5% 17% 47% 22%	2916
	11th to 20th	Night	17% 8% 32% 35% 7% 1	2972
	21st to end	Night	23% 12% 24% 27% 12% 1	3931
September	1st to 10th	Night	30% 9% 18% 22% 14% 7%	2200
	11th to 20th	Night	33% 7% 15% 23% 15% 6%	2178
	21st to end	Night	28% 6% 16% 19% 18% 13%	2090
October	1st to 10th	Night	14% 3 8% 17% 18% 39%	3480
	11th to 20th	Night	17% 3 8% 20% 31% 21%	3779
	21st to end	Night	21% 3 5% 25% 29% 17%	4120
November	1st to 10th	Night	33% 6% 10% 20% 19% 13%	2340
	11th to 20th	Night	34% 5% 9% 18% 19% 15%	2400
	21st to end	Night	38% 4 9% 18% 18% 13%	2595
December	1st to 10th	Night	53% 4 5% 15% 15% 8%	4250
	11th to 20th	Night	42% 3 9% 10% 20% 16%	4817
	21st to end	Night	34% 3 4 16% 29% 12%	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	25% 11% 34% 24% 5% 1	300
	11th to 20th	Day	23% 13% 30% 27% 5% 1	300
	21st to end	Day	24% 15% 32% 20% 8% 1	330
February	1st to 10th	Day	26% 14% 31% 20% 10%	300
	11th to 20th	Day	30% 17% 29% 18% 5% 1	300
	21st to end	Day	28% 13% 37% 18% 5%	249
March	1st to 10th	Day	19% 15% 39% 19% 7%	300
	11th to 20th	Day	17% 17% 38% 20% 6% 1	300
	21st to end	Day	20% 15% 33% 25% 8%	330
April	1st to 10th	Day	21% 16% 34% 23% 5% 1	300
	11th to 20th	Day	20% 14% 31% 25% 9% 1	340
	21st to end	Day	19% 10% 33% 28% 9% 1	528
May	1st to 10th	Day	13% 11% 40% 26% 10%	703
	11th to 20th	Day	14% 8% 27% 33% 15% 2	725
	21st to end	Day	12% 5% 27% 37% 17% 3	789
June	1st to 10th	Day	6% 2 13% 37% 33% 8%	730
	11th to 20th	Day	6% 1 14% 38% 32% 8%	730
	21st to end	Day	6% 2 9% 31% 36% 16%	730
July	1st to 10th	Day	8% 2 8% 29% 37% 17%	721
	11th to 20th	Day	4 2 3 27% 47% 17%	718
	21st to end	Day	5% 1 5% 25% 44% 20%	794
August	1st to 10th	Day	3 3 22% 49% 22%	726
	11th to 20th	Day	5% 3 23% 47% 22%	677
	21st to end	Day	6% 2 4 17% 31% 40%	378
September	1st to 10th	Day	8% 2 5% 25% 35% 27%	330
	11th to 20th	Day	6% 2 6% 21% 42% 24%	324
	21st to end	Day	10% 1 5% 21% 42% 20%	300
October	1st to 10th	Day	6% 1 10% 32% 36% 15%	300
	11th to 20th	Day	10% 3 17% 31% 29% 10%	300
	21st to end	Day	19% 10% 18% 23% 22% 7%	330
November	1st to 10th	Day	18% 6% 18% 33% 18% 7%	300
	11th to 20th	Day	16% 7% 22% 29% 21% 4	300
	21st to end	Day	20% 18% 26% 19% 13% 4	300
December	1st to 10th	Day	21% 8% 30% 25% 12% 4	300
	11th to 20th	Day	21% 12% 31% 24% 9% 2	300
	21st to end	Day	19% 8% 35% 28% 8% 2	330
January	1st to 10th	Night	21% 10% 32% 28% 9%	1000
	11th to 20th	Night	22% 11% 30% 29% 8%	1000
	21st to end	Night	23% 11% 29% 30% 6%	1083
February	1st to 10th	Night	26% 12% 31% 27% 4	800
	11th to 20th	Night	26% 10% 35% 24% 5%	784
	21st to end	Night	27% 13% 38% 20% 3	590
March	1st to 10th	Night	24% 10% 36% 27% 3	600
	11th to 20th	Night	20% 12% 37% 27% 6%	600
	21st to end	Night	18% 8% 42% 27% 4	660
April	1st to 10th	Night	17% 10% 40% 31% 3	600
	11th to 20th	Night	16% 12% 39% 26% 6%	593
	21st to end	Night	18% 11% 36% 27% 7% 1	600
May	1st to 10th	Night	15% 10% 41% 28% 5%	600
	11th to 20th	Night	12% 6% 33% 38% 11% 1	591
	21st to end	Night	8% 4 31% 40% 16%	650
June	1st to 10th	Night	4 3 17% 52% 24% 1	600
	11th to 20th	Night	4 2 21% 54% 18% 1	600
	21st to end	Night	5% 2 13% 44% 33% 3	600
July	1st to 10th	Night	6% 2 8% 46% 33% 5%	585
	11th to 20th	Night	4 1 7% 45% 40% 2	582
	21st to end	Night	5% 1 5% 48% 36% 4	657
August	1st to 10th	Night	1 4 51% 40% 4	597
	11th to 20th	Night	5% 1 5% 45% 40% 5%	594
	21st to end	Night	5% 4 35% 49% 6%	660
September	1st to 10th	Night	7% 1 8% 35% 45% 5%	600
	11th to 20th	Night	9% 1 7% 36% 43% 4	594
	21st to end	Night	9% 1 12% 33% 41% 4	570
October	1st to 10th	Night	4 2 10% 45% 34% 5%	570
	11th to 20th	Night	11% 4 21% 44% 19% 2	760
	21st to end	Night	11% 9% 25% 34% 19% 2	836
November	1st to 10th	Night	11% 5% 22% 42% 18% 1	780
	11th to 20th	Night	14% 7% 24% 39% 16% 1	800
	21st to end	Night	18% 9% 28% 30% 14% 1	995
December	1st to 10th	Night	22% 9% 26% 31% 12% 1	1000
	11th to 20th	Night	25% 12% 26% 31% 7% 1	1000
	21st to end	Night	20% 9% 30% 32% 8%	1100

Page generated at 2025-09-16 00:49:13. Version ac07

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