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 2026-09-29.

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	6% 8% 3 6% 4 4 4 3 5% 6% 53%	157873
	Night	8% 8% 3 6% 4 4 4 3 5% 6% 50%	150909
Transparency	Day	33% 5% 8% 21% 21% 13%	152621
	Night	35% 5% 11% 22% 18% 9%	147163
Seeing	Day	13% 13% 29% 28% 13% 3	16839
	Night	14% 5% 19% 39% 21% 2	26061

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% 12% 6% 6% 5% 4 5% 5% 21%	4722
	11th to 20th	Day	7% 10% 5% 6% 3 3 2 2 3 6% 53%	4740
	21st to end	Day	10% 12% 3 6% 4 4 4 3 4 5% 45%	5187
February	1st to 10th	Day	12% 17% 5% 10% 6% 4 4 3 5% 5% 29%	1822
	11th to 20th	Day	11% 20% 5% 8% 6% 5% 4 5% 4 6% 27%	2050
	21st to end	Day	10% 19% 6% 10% 6% 4 5% 3 5% 5% 26%	1730
March	1st to 10th	Day	6% 14% 6% 9% 6% 5% 5% 4 6% 7% 31%	4618
	11th to 20th	Day	7% 14% 4 8% 5% 5% 4 3 4 5% 41%	4930
	21st to end	Day	10% 16% 4 11% 7% 7% 6% 4 5% 6% 24%	5829
April	1st to 10th	Day	11% 13% 4 9% 6% 5% 4 4 5% 7% 32%	2520
	11th to 20th	Day	9% 11% 3 8% 5% 5% 5% 4 5% 6% 39%	2558
	21st to end	Day	10% 10% 3 7% 5% 5% 5% 5% 5% 6% 39%	2730
May	1st to 10th	Day	5% 7% 2 5% 4 3 3 3 4 6% 57%	7626
	11th to 20th	Day	6% 5% 2 5% 4 4 4 4 6% 7% 53%	7855
	21st to end	Day	5% 5% 1 4 4 4 4 4 6% 7% 56%	8992
June	1st to 10th	Day	10% 7% 2 6% 5% 5% 5% 4 7% 7% 41%	2940
	11th to 20th	Day	10% 5% 2 5% 5% 4 4 3 6% 6% 51%	2940
	21st to end	Day	4 3 2 5% 2 3 3 3 4 5% 65%	2940
July	1st to 10th	Day	2 1 2 2 2 2 2 3 5% 79%	8219
	11th to 20th	Day	1 2 1 4 3 3 3 2 4 5% 73%	8220
	21st to end	Day	2 2 1 3 2 2 3 3 5% 6% 72%	8922
August	1st to 10th	Day	1 2 1 3 3 3 3 3 4 7% 70%	7814
	11th to 20th	Day	1 1 1 3 2 3 3 3 4 6% 74%	7565
	21st to end	Day	4 3 2 4 3 4 4 3 5% 6% 62%	7867
September	1st to 10th	Day	4 2 1 2 3 4 3 2 4 6% 69%	2520
	11th to 20th	Day	6% 4 1 5% 3 4 3 4 4 6% 60%	2320
	21st to end	Day	6% 4 2 4 3 3 4 3 4 6% 62%	2289
October	1st to 10th	Day	6% 3 1 5% 3 3 3 2 3 5% 65%	3600
	11th to 20th	Day	8% 5% 2 6% 4 4 4 3 5% 5% 53%	3116
	21st to end	Day	8% 8% 3 8% 5% 5% 5% 4 5% 6% 43%	3200
November	1st to 10th	Day	14% 12% 3 7% 4 4 3 3 6% 7% 35%	1854
	11th to 20th	Day	15% 14% 3 8% 5% 4 4 3 6% 6% 33%	1890
	21st to end	Day	11% 12% 4 7% 5% 4 4 5% 5% 7% 37%	1848
December	1st to 10th	Day	10% 9% 3 6% 4 3 3 3 4 5% 51%	2700
	11th to 20th	Day	14% 19% 6% 11% 4 5% 5% 4 6% 6% 22%	3108
	21st to end	Day	11% 14% 5% 11% 5% 4 5% 3 5% 6% 30%	4092
January	1st to 10th	Night	11% 18% 5% 10% 6% 5% 4 4 5% 5% 26%	8172
	11th to 20th	Night	9% 11% 4 6% 3 3 2 2 4 5% 50%	8220
	21st to end	Night	10% 10% 3 6% 4 4 3 3 5% 6% 45%	8994
February	1st to 10th	Night	14% 17% 5% 9% 5% 5% 3 3 4 5% 32%	2792
	11th to 20th	Night	10% 18% 4 8% 5% 4 4 3 5% 5% 35%	2458
	21st to end	Night	11% 17% 6% 9% 5% 4 5% 3 4 6% 30%	2076
March	1st to 10th	Night	7% 16% 4 7% 5% 4 4 3 4 7% 41%	5496
	11th to 20th	Night	11% 14% 4 7% 4 4 4 3 4 5% 42%	5290
	21st to end	Night	8% 12% 3 9% 5% 5% 6% 5% 7% 9% 31%	5386
April	1st to 10th	Night	11% 9% 3 5% 4 4 4 4 5% 7% 43%	2100
	11th to 20th	Night	10% 7% 3 7% 5% 4 4 4 5% 4 46%	2008
	21st to end	Night	8% 6% 2 6% 4 4 5% 4 5% 6% 49%	1890
May	1st to 10th	Night	6% 6% 1 3 2 2 3 3 4 7% 62%	5321
	11th to 20th	Night	5% 3 2 5% 3 4 4 3 5% 7% 58%	5004
	21st to end	Night	4 4 1 4 4 4 4 3 5% 6% 59%	5181
June	1st to 10th	Night	11% 4 1 4 4 5% 5% 4 6% 8% 47%	1680
	11th to 20th	Night	8% 4 1 5% 3 3 4 3 4 6% 59%	1680
	21st to end	Night	3 4 1 3 3 4 3 4 5% 6% 66%	1680
July	1st to 10th	Night	1 1 1 2 2 2 3 3 4 5% 76%	4740
	11th to 20th	Night	1 1 1 3 2 2 3 2 4 5% 76%	4740
	21st to end	Night	1 2 1 3 2 3 3 3 6% 8% 68%	5153
August	1st to 10th	Night	2 2 1 3 3 3 3 3 5% 6% 70%	4994
	11th to 20th	Night	1 1 2 2 3 3 3 5% 8% 72%	5291
	21st to end	Night	4 3 2 5% 3 4 4 4 5% 7% 59%	6371
September	1st to 10th	Night	3 2 1 2 3 2 3 2 3 6% 72%	2100
	11th to 20th	Night	5% 4 1 5% 3 3 4 3 5% 6% 61%	2299
	21st to end	Night	7% 3 2 3 2 2 3 3 4 5% 66%	2288
October	1st to 10th	Night	5% 3 1 3 3 3 3 2 4 5% 68%	3600
	11th to 20th	Night	7% 4 2 5% 3 3 4 3 4 5% 59%	4017
	21st to end	Night	10% 8% 2 5% 4 4 5% 4 6% 8% 44%	4600
November	1st to 10th	Night	15% 9% 3 7% 4 4 3 3 5% 6% 41%	2665
	11th to 20th	Night	17% 11% 3 6% 4 4 4 4 6% 6% 35%	2730
	21st to end	Night	12% 12% 3 6% 5% 4 4 3 5% 6% 40%	2771
December	1st to 10th	Night	9% 10% 3 6% 3 3 3 3 4 5% 51%	4700
	11th to 20th	Night	12% 18% 6% 10% 6% 4 5% 4 6% 6% 23%	5316
	21st to end	Night	14% 14% 5% 9% 6% 4 5% 4 5% 6% 28%	7106

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	63% 8% 11% 14% 2	4723
	11th to 20th	Day	35% 3 16% 35% 10% 1	4740
	21st to end	Day	42% 6% 13% 26% 12% 2	5187
February	1st to 10th	Day	57% 7% 14% 17% 5% 1	1822
	11th to 20th	Day	57% 9% 11% 15% 7%	2060
	21st to end	Day	59% 8% 8% 16% 8% 1	1730
March	1st to 10th	Day	50% 5% 9% 19% 13% 3	4618
	11th to 20th	Day	44% 5% 9% 30% 12% 1	4930
	21st to end	Day	57% 9% 11% 18% 5%	5829
April	1st to 10th	Day	50% 7% 13% 20% 9% 1	2520
	11th to 20th	Day	44% 6% 11% 22% 15% 2	2561
	21st to end	Day	43% 8% 10% 24% 15%	2730
May	1st to 10th	Day	28% 5% 5% 29% 30% 4	7626
	11th to 20th	Day	27% 5% 7% 28% 26% 7%	7858
	21st to end	Day	26% 6% 8% 29% 27% 5%	8994
June	1st to 10th	Day	40% 6% 11% 24% 17% 2	2940
	11th to 20th	Day	32% 5% 7% 23% 25% 9%	2940
	21st to end	Day	21% 4 4 20% 36% 15%	2940
July	1st to 10th	Day	10% 2 2 12% 29% 46%	8151
	11th to 20th	Day	15% 2 3 8% 25% 48%	8145
	21st to end	Day	13% 2 3 14% 31% 36%	8723
August	1st to 10th	Day	17% 2 3 8% 24% 45%	6183
	11th to 20th	Day	15% 2 5% 18% 40% 20%	5964
	21st to end	Day	20% 2 4 21% 33% 19%	6170
September	1st to 10th	Day	17% 3 5% 19% 32% 24%	2520
	11th to 20th	Day	25% 4 8% 22% 29% 12%	2320
	21st to end	Day	24% 4 6% 27% 29% 10%	2289
October	1st to 10th	Day	24% 3 6% 18% 40% 9%	3600
	11th to 20th	Day	33% 3 10% 25% 24% 4	3116
	21st to end	Day	41% 4 10% 25% 19% 1	3200
November	1st to 10th	Day	48% 6% 12% 21% 12% 1	1854
	11th to 20th	Day	51% 6% 16% 19% 7%	1890
	21st to end	Day	47% 5% 16% 20% 10% 2	1848
December	1st to 10th	Day	36% 5% 18% 36% 4 1	2700
	11th to 20th	Day	62% 7% 16% 11% 4	3108
	21st to end	Day	54% 5% 14% 19% 7%	4092
January	1st to 10th	Night	58% 7% 18% 15% 3	8172
	11th to 20th	Night	37% 3 18% 28% 12% 1	8220
	21st to end	Night	40% 6% 13% 29% 10% 3	8994
February	1st to 10th	Night	55% 7% 15% 18% 5% 1	2792
	11th to 20th	Night	51% 6% 14% 18% 10% 1	2459
	21st to end	Night	54% 7% 9% 18% 10% 2	2076
March	1st to 10th	Night	43% 5% 9% 24% 17% 1	5496
	11th to 20th	Night	45% 4 8% 28% 14% 1	5290
	21st to end	Night	46% 10% 17% 21% 7%	5386
April	1st to 10th	Night	40% 6% 13% 27% 14% 1	2100
	11th to 20th	Night	39% 5% 11% 26% 17% 2	2008
	21st to end	Night	35% 6% 14% 27% 18% 1	1890
May	1st to 10th	Night	22% 4 6% 32% 32% 4	5319
	11th to 20th	Night	25% 4 7% 31% 30% 3	5004
	21st to end	Night	26% 4 9% 36% 23% 3	5182
June	1st to 10th	Night	33% 7% 12% 30% 17% 1	1680
	11th to 20th	Night	27% 4 8% 25% 27% 8%	1680
	21st to end	Night	19% 5% 6% 21% 35% 15%	1680
July	1st to 10th	Night	12% 2 3 13% 27% 43%	4700
	11th to 20th	Night	12% 2 2 9% 26% 48%	4692
	21st to end	Night	15% 2 5% 16% 28% 34%	5040
August	1st to 10th	Night	16% 2 3 8% 27% 44%	3953
	11th to 20th	Night	13% 3 6% 16% 36% 26%	4168
	21st to end	Night	21% 2 5% 21% 29% 20%	4990
September	1st to 10th	Night	16% 3 5% 18% 34% 24%	2100
	11th to 20th	Night	24% 4 9% 19% 28% 16%	2299
	21st to end	Night	22% 3 5% 28% 29% 14%	2288
October	1st to 10th	Night	21% 3 6% 22% 34% 15%	3600
	11th to 20th	Night	28% 3 13% 24% 28% 4	4017
	21st to end	Night	36% 5% 14% 25% 19% 2	4600
November	1st to 10th	Night	44% 5% 12% 23% 14% 2	2665
	11th to 20th	Night	48% 7% 13% 23% 9%	2730
	21st to end	Night	45% 5% 14% 22% 11% 2	2771
December	1st to 10th	Night	35% 5% 26% 27% 6%	4700
	11th to 20th	Night	61% 6% 16% 13% 4	5316
	21st to end	Night	55% 6% 16% 17% 6% 1	7106

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% 27% 21% 12% 2	220
	11th to 20th	Day	16% 10% 21% 28% 15% 9%	220
	21st to end	Day	14% 8% 27% 29% 16% 6%	242
February	1st to 10th	Day	24% 15% 26% 23% 11% 2	310
	11th to 20th	Day	19% 15% 36% 21% 9% 1	535
	21st to end	Day	21% 17% 29% 24% 8%	446
March	1st to 10th	Day	19% 19% 31% 25% 5% 1	540
	11th to 20th	Day	19% 15% 27% 28% 9% 1	540
	21st to end	Day	19% 22% 30% 23% 6% 1	594
April	1st to 10th	Day	19% 18% 27% 21% 13% 3	540
	11th to 20th	Day	18% 21% 30% 22% 8% 2	532
	21st to end	Day	15% 20% 30% 23% 9% 2	540
May	1st to 10th	Day	12% 16% 34% 25% 10% 3	543
	11th to 20th	Day	21% 15% 29% 22% 10% 2	568
	21st to end	Day	10% 14% 27% 28% 16% 5%	617
June	1st to 10th	Day	11% 15% 31% 26% 12% 4	570
	11th to 20th	Day	13% 19% 32% 21% 11% 3	570
	21st to end	Day	4 13% 33% 31% 15% 4	570
July	1st to 10th	Day	2 10% 38% 32% 14% 4	566
	11th to 20th	Day	1 12% 36% 33% 13% 4	564
	21st to end	Day	3 7% 32% 36% 17% 4	619
August	1st to 10th	Day	5% 9% 32% 35% 15% 5%	567
	11th to 20th	Day	3 7% 27% 39% 21% 4	557
	21st to end	Day	6% 11% 30% 32% 17% 4	627
September	1st to 10th	Day	5% 8% 25% 36% 20% 5%	570
	11th to 20th	Day	9% 8% 28% 32% 18% 4	570
	21st to end	Day	7% 9% 32% 32% 15% 4	563
October	1st to 10th	Day	10% 11% 25% 32% 17% 4	530
	11th to 20th	Day	13% 11% 23% 30% 17% 5%	396
	21st to end	Day	15% 16% 20% 30% 15% 4	363
November	1st to 10th	Day	19% 12% 24% 28% 15% 3	330
	11th to 20th	Day	17% 11% 27% 29% 14% 3	330
	21st to end	Day	15% 8% 26% 31% 16% 5%	308
December	1st to 10th	Day	25% 10% 20% 20% 16% 9%	220
	11th to 20th	Day	26% 11% 22% 27% 11% 3	220
	21st to end	Day	18% 15% 24% 29% 11% 3	242
January	1st to 10th	Night	25% 6% 21% 32% 14% 2	840
	11th to 20th	Night	23% 5% 20% 31% 18% 3	840
	21st to end	Night	19% 4 20% 35% 19% 2	924
February	1st to 10th	Night	23% 8% 24% 31% 13% 2	840
	11th to 20th	Night	19% 5% 25% 35% 14% 1	824
	21st to end	Night	19% 7% 25% 35% 14% 2	692
March	1st to 10th	Night	18% 7% 25% 34% 13% 2	840
	11th to 20th	Night	17% 6% 23% 38% 15% 1	840
	21st to end	Night	19% 7% 23% 37% 12% 1	924
April	1st to 10th	Night	16% 7% 19% 37% 18% 2	840
	11th to 20th	Night	13% 8% 28% 38% 13% 1	760
	21st to end	Night	10% 7% 21% 44% 17% 1	630
May	1st to 10th	Night	9% 7% 20% 42% 22%	630
	11th to 20th	Night	9% 5% 22% 36% 27% 2	525
	21st to end	Night	10% 4 15% 41% 28% 2	455
June	1st to 10th	Night	11% 4 15% 44% 25% 2	420
	11th to 20th	Night	9% 2 17% 48% 23% 1	420
	21st to end	Night	5% 2 10% 53% 30%	420
July	1st to 10th	Night	1 11% 52% 33% 2	410
	11th to 20th	Night	2 1 12% 57% 28%	408
	21st to end	Night	3 1 10% 48% 35% 2	460
August	1st to 10th	Night	4 2 10% 50% 32% 2	527
	11th to 20th	Night	1 2 8% 48% 38% 3	624
	21st to end	Night	4 2 12% 48% 31% 3	872
September	1st to 10th	Night	5% 1 9% 50% 33% 3	840
	11th to 20th	Night	6% 3 10% 44% 34% 3	840
	21st to end	Night	8% 2 14% 39% 31% 6%	832
October	1st to 10th	Night	10% 2 16% 44% 27% 2	800
	11th to 20th	Night	12% 4 16% 41% 25% 3	800
	21st to end	Night	15% 3 21% 38% 20% 2	880
November	1st to 10th	Night	20% 5% 20% 35% 18% 2	820
	11th to 20th	Night	24% 5% 19% 36% 15% 2	840
	21st to end	Night	17% 5% 21% 37% 16% 3	840
December	1st to 10th	Night	20% 6% 21% 34% 15% 3	840
	11th to 20th	Night	25% 6% 21% 32% 13% 2	840
	21st to end	Night	28% 8% 24% 28% 10% 1	924

Page generated at 2026-09-26 02:18:42. Version ac07

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