Weilmunster Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Weilmunster Park clear sky chart from 2005-11-06 to 2025-05-26.

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	7% 9% 3 6% 4 4 4 3 5% 6% 49%	117743
	Night	9% 10% 3 6% 4 4 4 3 5% 6% 47%	120325
Transparency	Day	36% 5% 9% 20% 18% 12%	117487
	Night	38% 5% 11% 21% 16% 8%	120170
Seeing	Day	13% 14% 30% 28% 13% 3	15062
	Night	15% 5% 19% 39% 21% 2	24468

By Month

Percentage Cloud Cover SW (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	8% 22% 7% 10% 6% 6% 4 4 4 5% 25%	3639
	11th to 20th	Day	9% 13% 6% 7% 4 4 3 3 3 5% 43%	3640
	21st to end	Day	13% 14% 4 6% 3 3 3 2 3 5% 44%	4004
February	1st to 10th	Day	12% 18% 5% 10% 6% 4 4 3 4 5% 28%	1735
	11th to 20th	Day	11% 20% 5% 7% 6% 5% 4 4 4 5% 27%	1950
	21st to end	Day	11% 19% 7% 10% 7% 4 5% 3 5% 5% 25%	1650
March	1st to 10th	Day	6% 14% 6% 9% 6% 5% 5% 4 6% 7% 31%	4518
	11th to 20th	Day	7% 14% 4 8% 5% 4 4 3 4 5% 41%	4824
	21st to end	Day	10% 16% 5% 11% 7% 7% 6% 4 5% 6% 23%	5703
April	1st to 10th	Day	11% 13% 4 9% 6% 5% 4 5% 5% 7% 31%	2400
	11th to 20th	Day	9% 11% 3 8% 6% 5% 5% 4 5% 6% 40%	2435
	21st to end	Day	10% 10% 3 7% 5% 5% 4 5% 5% 6% 39%	2600
May	1st to 10th	Day	8% 12% 3 8% 5% 4 4 4 5% 6% 40%	4240
	11th to 20th	Day	6% 5% 2 5% 4 4 4 4 5% 7% 56%	4348
	21st to end	Day	8% 8% 2 6% 5% 5% 4 4 6% 7% 45%	4886
June	1st to 10th	Day	11% 7% 3 7% 6% 5% 5% 4 7% 7% 39%	2660
	11th to 20th	Day	11% 5% 2 5% 5% 4 4 3 6% 6% 50%	2660
	21st to end	Day	4 3 1 4 2 3 4 3 4 5% 67%	2660
July	1st to 10th	Day	1 1 1 2 2 2 2 3 4 81%	4420
	11th to 20th	Day	2 2 1 2 2 2 3 2 3 5% 78%	4420
	21st to end	Day	2 2 1 3 2 2 2 3 4 5% 74%	4790
August	1st to 10th	Day	3 3 2 5% 5% 5% 4 3 4 6% 61%	4229
	11th to 20th	Day	1 1 1 2 2 3 3 2 3 5% 78%	4028
	21st to end	Day	3 2 1 3 3 3 2 2 3 4 74%	4247
September	1st to 10th	Day	4 2 1 2 2 3 3 2 4 5% 71%	2280
	11th to 20th	Day	6% 4 1 5% 3 3 3 3 4 7% 60%	2100
	21st to end	Day	7% 4 2 3 3 3 4 3 5% 5% 62%	2090
October	1st to 10th	Day	6% 3 1 5% 3 3 3 2 3 4 65%	3490
	11th to 20th	Day	8% 5% 2 6% 4 4 4 3 5% 6% 53%	3020
	21st to end	Day	8% 9% 3 8% 6% 5% 5% 4 5% 6% 42%	3101
November	1st to 10th	Day	15% 12% 3 7% 4 4 3 3 6% 7% 35%	1764
	11th to 20th	Day	15% 14% 4 7% 5% 4 4 3 5% 6% 34%	1800
	21st to end	Day	11% 13% 4 7% 5% 4 4 4 5% 7% 36%	1760
December	1st to 10th	Day	10% 9% 2 6% 4 3 3 3 4 5% 52%	2620
	11th to 20th	Day	14% 20% 6% 11% 4 5% 5% 4 6% 6% 21%	3028
	21st to end	Day	11% 14% 5% 11% 5% 4 5% 3 5% 6% 30%	4004
January	1st to 10th	Night	13% 18% 5% 9% 5% 4 4 4 5% 5% 28%	6306
	11th to 20th	Night	12% 14% 5% 7% 4 3 3 3 4 5% 39%	6320
	21st to end	Night	12% 13% 3 7% 4 4 3 3 4 5% 43%	6952
February	1st to 10th	Night	14% 17% 5% 9% 5% 5% 3 4 4 5% 31%	2660
	11th to 20th	Night	11% 18% 4 7% 4 4 4 2 5% 5% 36%	2338
	21st to end	Night	11% 17% 6% 9% 5% 4 4 3 4 6% 29%	1980
March	1st to 10th	Night	7% 16% 4 7% 5% 4 4 3 4 7% 41%	5376
	11th to 20th	Night	11% 14% 4 6% 4 4 4 3 4 5% 41%	5176
	21st to end	Night	8% 12% 3 9% 6% 5% 6% 5% 7% 9% 31%	5270
April	1st to 10th	Night	12% 10% 3 5% 5% 4 5% 4 5% 7% 42%	2000
	11th to 20th	Night	11% 7% 3 6% 5% 4 4 3 5% 4 47%	1911
	21st to end	Night	8% 6% 2 7% 4 4 5% 4 5% 6% 49%	1800
May	1st to 10th	Night	10% 9% 2 4 3 3 4 4 5% 7% 49%	2950
	11th to 20th	Night	5% 3 1 4 3 3 4 4 5% 7% 60%	2767
	21st to end	Night	7% 7% 2 6% 5% 4 4 2 4 7% 52%	2805
June	1st to 10th	Night	12% 4 1 5% 4 6% 5% 5% 7% 9% 44%	1520
	11th to 20th	Night	8% 5% 1 5% 3 3 4 3 4 6% 57%	1520
	21st to end	Night	3 3 2 3 4 3 4 5% 6% 67%	1520
July	1st to 10th	Night	1 1 2 2 1 2 3 4 4 80%	2540
	11th to 20th	Night	1 1 1 2 2 3 3 4 5% 78%	2540
	21st to end	Night	2 2 1 3 2 3 3 3 6% 6% 69%	2761
August	1st to 10th	Night	3 3 1 5% 4 4 3 4 6% 7% 60%	2706
	11th to 20th	Night	1 1 2 2 2 3 3 4 7% 77%	2811
	21st to end	Night	2 2 1 4 3 2 2 2 3 4 75%	3424
September	1st to 10th	Night	3 2 1 2 2 2 3 2 3 5% 74%	1900
	11th to 20th	Night	5% 4 1 5% 3 3 4 3 5% 6% 61%	2080
	21st to end	Night	8% 3 2 4 3 2 3 2 3 5% 66%	2090
October	1st to 10th	Night	5% 3 1 3 3 3 3 2 4 5% 68%	3490
	11th to 20th	Night	8% 5% 2 5% 3 3 4 2 4 5% 60%	3893
	21st to end	Night	10% 8% 2 5% 4 4 5% 4 6% 8% 44%	4457
November	1st to 10th	Night	15% 9% 3 7% 4 4 4 3 5% 7% 41%	2535
	11th to 20th	Night	17% 11% 3 6% 4 4 4 4 6% 6% 35%	2600
	21st to end	Night	12% 12% 3 6% 4 4 4 3 5% 6% 40%	2639
December	1st to 10th	Night	9% 10% 3 6% 3 3 3 3 4 5% 52%	4560
	11th to 20th	Night	12% 18% 6% 10% 6% 5% 5% 4 6% 6% 22%	5176
	21st to end	Night	13% 14% 5% 9% 6% 4 5% 4 5% 6% 28%	6952

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	60% 8% 10% 18% 3	3639
	11th to 20th	Day	45% 4 16% 25% 8% 1	3640
	21st to end	Day	44% 5% 13% 23% 12% 3	4004
February	1st to 10th	Day	58% 7% 13% 16% 5% 1	1735
	11th to 20th	Day	57% 9% 11% 15% 7%	1960
	21st to end	Day	60% 8% 8% 16% 7% 1	1650
March	1st to 10th	Day	50% 5% 9% 19% 14% 3	4518
	11th to 20th	Day	44% 5% 9% 31% 11% 1	4824
	21st to end	Day	57% 9% 11% 18% 5%	5703
April	1st to 10th	Day	51% 7% 13% 18% 9% 1	2400
	11th to 20th	Day	44% 6% 11% 21% 16% 2	2438
	21st to end	Day	43% 8% 10% 24% 14%	2600
May	1st to 10th	Day	43% 8% 6% 24% 17% 2	4240
	11th to 20th	Day	26% 7% 6% 29% 24% 8%	4351
	21st to end	Day	35% 8% 10% 31% 13% 3	4887
June	1st to 10th	Day	42% 7% 11% 24% 14% 1	2660
	11th to 20th	Day	33% 6% 7% 23% 23% 8%	2660
	21st to end	Day	20% 4 4 19% 36% 16%	2660
July	1st to 10th	Day	10% 2 2 10% 20% 55%	4351
	11th to 20th	Day	11% 2 2 6% 23% 55%	4345
	21st to end	Day	12% 3 2 9% 30% 43%	4639
August	1st to 10th	Day	24% 3 4 11% 28% 30%	4213
	11th to 20th	Day	11% 2 3 15% 44% 25%	4067
	21st to end	Day	16% 2 4 18% 35% 25%	4246
September	1st to 10th	Day	16% 3 4 18% 32% 26%	2280
	11th to 20th	Day	25% 5% 8% 21% 29% 13%	2100
	21st to end	Day	24% 5% 6% 27% 28% 10%	2090
October	1st to 10th	Day	24% 3 6% 17% 40% 10%	3490
	11th to 20th	Day	33% 3 11% 24% 25% 4	3020
	21st to end	Day	42% 4 10% 24% 19% 1	3101
November	1st to 10th	Day	48% 6% 12% 21% 13% 1	1764
	11th to 20th	Day	51% 6% 16% 20% 8%	1800
	21st to end	Day	48% 5% 15% 19% 11% 2	1760
December	1st to 10th	Day	35% 5% 18% 37% 4 1	2620
	11th to 20th	Day	63% 7% 16% 11% 3	3028
	21st to end	Day	54% 5% 14% 19% 7%	4004
January	1st to 10th	Night	56% 6% 16% 18% 3	6306
	11th to 20th	Night	48% 4 15% 21% 11% 1	6320
	21st to end	Night	44% 5% 11% 26% 10% 3	6952
February	1st to 10th	Night	56% 7% 14% 17% 5% 1	2660
	11th to 20th	Night	51% 6% 15% 18% 10% 1	2339
	21st to end	Night	55% 7% 9% 17% 9% 2	1980
March	1st to 10th	Night	44% 5% 9% 24% 17% 1	5376
	11th to 20th	Night	45% 4 8% 29% 14% 1	5176
	21st to end	Night	46% 10% 17% 21% 6%	5270
April	1st to 10th	Night	41% 6% 13% 25% 14% 1	2000
	11th to 20th	Night	39% 5% 11% 25% 17% 2	1911
	21st to end	Night	35% 7% 14% 27% 17% 1	1800
May	1st to 10th	Night	33% 6% 8% 29% 21% 3	2950
	11th to 20th	Night	22% 5% 9% 34% 27% 3	2767
	21st to end	Night	33% 5% 11% 35% 14% 1	2805
June	1st to 10th	Night	35% 8% 13% 31% 13%	1520
	11th to 20th	Night	29% 4 9% 26% 25% 8%	1520
	21st to end	Night	17% 5% 6% 21% 36% 15%	1520
July	1st to 10th	Night	8% 2 3 9% 24% 53%	2500
	11th to 20th	Night	10% 2 2 9% 21% 56%	2492
	21st to end	Night	15% 3 4 10% 29% 39%	2674
August	1st to 10th	Night	22% 3 4 10% 32% 29%	2698
	11th to 20th	Night	10% 2 3 13% 40% 32%	2838
	21st to end	Night	15% 2 3 19% 33% 28%	3424
September	1st to 10th	Night	15% 3 5% 17% 34% 27%	1900
	11th to 20th	Night	24% 4 8% 18% 28% 17%	2080
	21st to end	Night	22% 3 5% 27% 28% 14%	2090
October	1st to 10th	Night	20% 3 6% 21% 34% 16%	3490
	11th to 20th	Night	28% 2 13% 24% 28% 5%	3893
	21st to end	Night	36% 5% 14% 24% 19% 2	4457
November	1st to 10th	Night	44% 5% 12% 23% 15% 2	2535
	11th to 20th	Night	48% 7% 13% 23% 9%	2600
	21st to end	Night	45% 5% 13% 23% 12% 2	2639
December	1st to 10th	Night	35% 5% 26% 28% 6%	4560
	11th to 20th	Night	61% 6% 16% 13% 3	5176
	21st to end	Night	55% 6% 15% 17% 6% 1	6952

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	18% 19% 29% 23% 12% 2	200
	11th to 20th	Day	18% 11% 23% 27% 13% 9%	200
	21st to end	Day	16% 9% 29% 26% 15% 5%	220
February	1st to 10th	Day	25% 14% 28% 22% 9% 1	283
	11th to 20th	Day	20% 15% 37% 20% 8% 1	495
	21st to end	Day	21% 18% 29% 23% 8%	414
March	1st to 10th	Day	19% 19% 32% 24% 5% 1	500
	11th to 20th	Day	19% 16% 28% 26% 9% 2	500
	21st to end	Day	20% 21% 30% 22% 6% 1	550
April	1st to 10th	Day	21% 18% 27% 21% 11% 2	500
	11th to 20th	Day	17% 21% 30% 22% 8% 2	492
	21st to end	Day	16% 20% 31% 22% 9% 2	500
May	1st to 10th	Day	13% 16% 33% 25% 10% 2	503
	11th to 20th	Day	21% 16% 28% 22% 11% 2	528
	21st to end	Day	11% 14% 26% 28% 16% 5%	550
June	1st to 10th	Day	11% 16% 30% 26% 12% 3	490
	11th to 20th	Day	15% 19% 32% 21% 11% 2	490
	21st to end	Day	4 13% 35% 29% 15% 3	490
July	1st to 10th	Day	2 10% 39% 32% 13% 3	486
	11th to 20th	Day	1 12% 37% 33% 12% 4	484
	21st to end	Day	2 8% 32% 38% 16% 3	531
August	1st to 10th	Day	5% 10% 33% 35% 15% 3	487
	11th to 20th	Day	2 8% 28% 39% 21% 3	477
	21st to end	Day	6% 11% 30% 34% 17% 3	539
September	1st to 10th	Day	5% 8% 26% 38% 19% 4	490
	11th to 20th	Day	10% 8% 30% 33% 17% 2	490
	21st to end	Day	7% 10% 32% 33% 14% 3	490
October	1st to 10th	Day	11% 11% 25% 32% 18% 4	490
	11th to 20th	Day	13% 10% 24% 30% 17% 6%	363
	21st to end	Day	16% 16% 21% 30% 14% 3	330
November	1st to 10th	Day	21% 11% 24% 27% 15% 2	300
	11th to 20th	Day	16% 11% 28% 30% 13% 3	300
	21st to end	Day	16% 7% 28% 30% 16% 4	280
December	1st to 10th	Day	25% 9% 19% 22% 16% 10%	200
	11th to 20th	Day	25% 12% 24% 26% 11% 2	200
	21st to end	Day	18% 15% 25% 29% 11% 2	220
January	1st to 10th	Night	25% 6% 20% 32% 15% 2	800
	11th to 20th	Night	25% 5% 21% 29% 18% 3	800
	21st to end	Night	20% 4 21% 33% 19% 2	880
February	1st to 10th	Night	23% 8% 25% 31% 12% 1	800
	11th to 20th	Night	20% 5% 25% 35% 14% 1	784
	21st to end	Night	19% 7% 24% 35% 14% 2	660
March	1st to 10th	Night	19% 8% 25% 34% 13% 2	800
	11th to 20th	Night	17% 6% 22% 39% 16% 1	800
	21st to end	Night	20% 8% 23% 37% 13% 1	880
April	1st to 10th	Night	17% 7% 20% 37% 18% 2	800
	11th to 20th	Night	13% 8% 28% 37% 13% 1	723
	21st to end	Night	10% 6% 22% 44% 17% 1	600
May	1st to 10th	Night	9% 7% 21% 41% 22% 1	600
	11th to 20th	Night	9% 5% 21% 35% 28% 2	500
	21st to end	Night	11% 5% 14% 41% 27% 2	422
June	1st to 10th	Night	12% 4 14% 44% 24% 3	380
	11th to 20th	Night	10% 2 18% 45% 23% 2	380
	21st to end	Night	4 2 9% 55% 29% 1	380
July	1st to 10th	Night	1 12% 51% 32% 2	370
	11th to 20th	Night	2 1 13% 57% 27% 1	368
	21st to end	Night	4 1 11% 48% 34% 2	416
August	1st to 10th	Night	5% 2 10% 48% 33% 3	477
	11th to 20th	Night	1 2 8% 46% 40% 3	564
	21st to end	Night	3 2 12% 48% 31% 3	788
September	1st to 10th	Night	4 1 8% 51% 32% 3	760
	11th to 20th	Night	6% 3 10% 45% 33% 3	760
	21st to end	Night	8% 3 14% 39% 30% 6%	760
October	1st to 10th	Night	9% 2 15% 45% 27% 2	760
	11th to 20th	Night	12% 4 16% 40% 26% 3	760
	21st to end	Night	15% 3 21% 39% 19% 3	836
November	1st to 10th	Night	20% 5% 21% 35% 18% 2	780
	11th to 20th	Night	24% 5% 20% 35% 14% 2	800
	21st to end	Night	18% 6% 21% 37% 16% 2	800
December	1st to 10th	Night	20% 6% 21% 34% 15% 4	800
	11th to 20th	Night	25% 6% 21% 32% 13% 2	800
	21st to end	Night	28% 8% 25% 29% 10% 1	880

Page generated at 2025-05-23 07:20:58. Version ac07

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