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 2024-03-06.

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	10% 9% 3 6% 5% 3 4 4 5% 6% 45%	78484
	Night	11% 10% 3 5% 5% 3 4 4 5% 6% 44%	81052
Transparency	Day	40% 6% 10% 19% 17% 9%	78188
	Night	41% 6% 11% 20% 15% 6%	80869
Seeing	Day	13% 13% 30% 28% 13% 2	13464
	Night	15% 5% 19% 39% 21% 2	22943

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	9% 22% 8% 8% 7% 4 4 5% 5% 6% 22%	2539
	11th to 20th	Day	13% 17% 9% 9% 6% 4 4 4 4 4 27%	2540
	21st to end	Day	17% 17% 6% 7% 6% 4 4 4 4 6% 27%	2794
February	1st to 10th	Day	13% 17% 6% 9% 6% 3 4 4 4 5% 29%	1647
	11th to 20th	Day	12% 19% 5% 6% 7% 3 5% 5% 4 6% 28%	1850
	21st to end	Day	12% 17% 8% 9% 8% 3 5% 4 5% 5% 23%	1570
March	1st to 10th	Day	13% 16% 7% 8% 7% 4 5% 4 5% 6% 25%	1851
	11th to 20th	Day	13% 12% 4 7% 7% 3 5% 5% 5% 7% 32%	1908
	21st to end	Day	15% 15% 4 8% 7% 4 6% 4 5% 7% 25%	2266
April	1st to 10th	Day	12% 13% 4 8% 7% 4 4 6% 5% 7% 30%	2160
	11th to 20th	Day	10% 11% 3 7% 6% 3 5% 5% 5% 6% 38%	2187
	21st to end	Day	11% 10% 3 6% 6% 3 5% 5% 5% 6% 40%	2340
May	1st to 10th	Day	8% 7% 3 5% 6% 3 5% 6% 5% 8% 44%	2340
	11th to 20th	Day	11% 7% 3 6% 6% 4 5% 5% 6% 8% 39%	2378
	21st to end	Day	10% 9% 3 7% 7% 5% 5% 6% 6% 8% 33%	2723
June	1st to 10th	Day	11% 7% 3 5% 7% 4 5% 5% 7% 7% 38%	2520
	11th to 20th	Day	11% 5% 2 4 6% 3 4 4 6% 7% 48%	2520
	21st to end	Day	4 3 2 4 3 2 4 3 4 5% 66%	2520
July	1st to 10th	Day	2 2 1 2 3 2 3 3 4 6% 71%	2520
	11th to 20th	Day	2 2 1 1 2 1 3 3 3 5% 78%	2520
	21st to end	Day	3 2 1 3 3 2 3 3 4 5% 71%	2741
August	1st to 10th	Day	4 3 1 3 4 3 4 3 4 6% 65%	2414
	11th to 20th	Day	2 1 1 2 2 2 3 3 4 6% 74%	2299
	21st to end	Day	3 2 1 2 3 2 3 3 4 5% 71%	2417
September	1st to 10th	Day	4 2 1 2 3 3 3 3 4 5% 72%	2160
	11th to 20th	Day	6% 3 2 4 4 2 3 4 4 6% 61%	1990
	21st to end	Day	7% 4 2 3 4 2 4 4 5% 5% 60%	1980
October	1st to 10th	Day	9% 5% 2 6% 5% 3 4 5% 4 6% 51%	1980
	11th to 20th	Day	10% 6% 2 5% 4 3 4 3 5% 6% 52%	1730
	21st to end	Day	10% 9% 3 6% 6% 4 5% 5% 4 6% 43%	1782
November	1st to 10th	Day	16% 12% 3 6% 4 3 4 4 6% 7% 35%	1674
	11th to 20th	Day	15% 13% 4 5% 6% 3 4 3 5% 6% 35%	1710
	21st to end	Day	11% 11% 5% 6% 6% 2 4 5% 5% 7% 36%	1672
December	1st to 10th	Day	17% 14% 5% 7% 5% 2 3 4 5% 6% 33%	1520
	11th to 20th	Day	16% 16% 5% 9% 5% 3 5% 4 6% 6% 26%	1928
	21st to end	Day	12% 12% 5% 8% 6% 3 4 4 5% 6% 35%	2794
January	1st to 10th	Night	13% 18% 6% 8% 7% 4 4 5% 4 5% 27%	4406
	11th to 20th	Night	18% 18% 8% 8% 6% 3 3 4 3 5% 25%	4420
	21st to end	Night	18% 17% 5% 7% 6% 3 4 4 4 5% 27%	4862
February	1st to 10th	Night	14% 16% 4 8% 5% 3 4 5% 4 5% 32%	2528
	11th to 20th	Night	12% 17% 5% 6% 5% 3 4 3 4 5% 36%	2218
	21st to end	Night	12% 16% 7% 9% 6% 3 5% 5% 4 6% 28%	1884
March	1st to 10th	Night	14% 15% 4 6% 6% 4 4 4 4 6% 33%	2225
	11th to 20th	Night	12% 11% 4 7% 5% 3 5% 5% 6% 7% 36%	2052
	21st to end	Night	12% 13% 4 6% 6% 3 5% 5% 5% 7% 33%	2088
April	1st to 10th	Night	12% 9% 3 5% 5% 3 4 5% 5% 7% 41%	1800
	11th to 20th	Night	12% 7% 4 6% 5% 3 5% 5% 5% 4 44%	1719
	21st to end	Night	8% 6% 2 5% 5% 2 5% 5% 5% 6% 51%	1620
May	1st to 10th	Night	7% 6% 2 4 3 3 5% 5% 5% 8% 53%	1620
	11th to 20th	Night	8% 5% 2 5% 5% 4 5% 6% 5% 9% 46%	1512
	21st to end	Night	9% 7% 2 6% 6% 4 5% 4 6% 10% 40%	1552
June	1st to 10th	Night	12% 4 2 4 4 4 5% 5% 6% 9% 45%	1440
	11th to 20th	Night	8% 5% 2 5% 4 3 4 4 3 6% 57%	1440
	21st to end	Night	3 3 1 2 3 3 4 5% 5% 6% 66%	1440
July	1st to 10th	Night	1 1 1 2 4 1 3 4 6% 7% 69%	1440
	11th to 20th	Night	2 1 1 3 2 2 3 4 5% 77%	1440
	21st to end	Night	2 2 1 3 3 2 2 3 5% 5% 71%	1576
August	1st to 10th	Night	3 3 1 3 4 3 2 4 5% 6% 65%	1525
	11th to 20th	Night	1 1 2 3 1 3 4 4 6% 76%	1602
	21st to end	Night	3 2 1 3 4 2 3 3 4 5% 71%	1934
September	1st to 10th	Night	3 2 1 2 3 1 3 3 3 5% 75%	1800
	11th to 20th	Night	5% 3 1 3 4 2 4 4 5% 6% 63%	1970
	21st to end	Night	8% 3 2 3 3 2 2 3 4 5% 65%	1980
October	1st to 10th	Night	8% 5% 2 4 4 2 3 4 5% 6% 57%	1980
	11th to 20th	Night	11% 5% 2 3 3 2 4 4 4 6% 56%	2225
	21st to end	Night	11% 7% 2 4 5% 2 4 5% 6% 7% 45%	2574
November	1st to 10th	Night	16% 9% 3 5% 5% 3 4 4 5% 7% 41%	2405
	11th to 20th	Night	18% 10% 3 5% 5% 3 3 5% 6% 6% 36%	2470
	21st to end	Night	12% 11% 4 6% 5% 3 4 4 5% 6% 40%	2507
December	1st to 10th	Night	13% 14% 4 6% 5% 4 5% 5% 5% 7% 33%	2660
	11th to 20th	Night	16% 16% 5% 7% 7% 4 5% 5% 5% 5% 26%	3276
	21st to end	Night	13% 13% 4 7% 6% 3 4 4 5% 6% 35%	4862

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	62% 9% 13% 14% 2 1	2539
	11th to 20th	Day	61% 6% 9% 17% 7% 1	2540
	21st to end	Day	59% 7% 17% 13% 3 1	2794
February	1st to 10th	Day	57% 7% 14% 17% 4 1	1647
	11th to 20th	Day	57% 10% 11% 16% 7%	1860
	21st to end	Day	61% 9% 7% 15% 6% 1	1570
March	1st to 10th	Day	59% 8% 11% 15% 7% 1	1851
	11th to 20th	Day	53% 6% 13% 20% 7% 1	1908
	21st to end	Day	60% 7% 12% 15% 6%	2266
April	1st to 10th	Day	53% 7% 14% 16% 9% 1	2160
	11th to 20th	Day	46% 6% 11% 21% 14% 2	2190
	21st to end	Day	44% 7% 10% 25% 13%	2340
May	1st to 10th	Day	37% 8% 10% 28% 16% 2	2340
	11th to 20th	Day	42% 7% 9% 28% 11% 3	2381
	21st to end	Day	47% 9% 11% 20% 11% 2	2724
June	1st to 10th	Day	42% 7% 12% 24% 14% 1	2520
	11th to 20th	Day	34% 6% 7% 23% 22% 7%	2520
	21st to end	Day	20% 5% 5% 19% 36% 16%	2520
July	1st to 10th	Day	16% 3 4 18% 29% 30%	2451
	11th to 20th	Day	11% 3 3 8% 32% 42%	2445
	21st to end	Day	15% 4 3 9% 27% 42%	2589
August	1st to 10th	Day	21% 5% 6% 16% 28% 24%	2397
	11th to 20th	Day	12% 3 4 19% 38% 23%	2299
	21st to end	Day	16% 4 4 18% 37% 21%	2417
September	1st to 10th	Day	16% 4 5% 18% 31% 27%	2160
	11th to 20th	Day	24% 5% 7% 20% 30% 14%	1990
	21st to end	Day	25% 5% 6% 28% 27% 10%	1980
October	1st to 10th	Day	35% 5% 10% 23% 22% 5%	1980
	11th to 20th	Day	34% 5% 10% 28% 21% 3	1730
	21st to end	Day	41% 6% 13% 22% 16% 1	1782
November	1st to 10th	Day	48% 6% 12% 20% 13% 1	1674
	11th to 20th	Day	50% 6% 16% 20% 8%	1710
	21st to end	Day	48% 5% 14% 19% 11% 2	1672
December	1st to 10th	Day	51% 8% 18% 17% 6% 1	1520
	11th to 20th	Day	59% 7% 15% 13% 5%	1928
	21st to end	Day	50% 5% 14% 22% 10% 1	2794
January	1st to 10th	Night	58% 8% 15% 16% 2 1	4406
	11th to 20th	Night	63% 5% 11% 14% 7%	4420
	21st to end	Night	59% 7% 14% 16% 4	4862
February	1st to 10th	Night	55% 7% 14% 18% 5% 1	2528
	11th to 20th	Night	51% 6% 15% 18% 10% 1	2219
	21st to end	Night	56% 7% 10% 17% 9% 2	1884
March	1st to 10th	Night	53% 7% 13% 18% 8% 2	2225
	11th to 20th	Night	47% 6% 13% 24% 9% 1	2052
	21st to end	Night	50% 8% 16% 18% 8%	2088
April	1st to 10th	Night	42% 7% 12% 24% 14% 1	1800
	11th to 20th	Night	42% 6% 11% 23% 16% 2	1719
	21st to end	Night	34% 6% 15% 26% 17% 1	1620
May	1st to 10th	Night	29% 5% 11% 31% 22% 1	1620
	11th to 20th	Night	34% 6% 13% 32% 14% 1	1512
	21st to end	Night	40% 6% 15% 27% 11% 1	1552
June	1st to 10th	Night	35% 7% 13% 31% 13%	1440
	11th to 20th	Night	29% 4 9% 26% 24% 7%	1440
	21st to end	Night	17% 5% 7% 21% 35% 15%	1440
July	1st to 10th	Night	14% 4 5% 16% 34% 28%	1400
	11th to 20th	Night	11% 3 4 13% 28% 41%	1392
	21st to end	Night	14% 3 4 10% 28% 40%	1488
August	1st to 10th	Night	20% 4 6% 14% 29% 26%	1517
	11th to 20th	Night	10% 4 4 17% 33% 31%	1602
	21st to end	Night	17% 3 4 16% 33% 26%	1934
September	1st to 10th	Night	15% 3 5% 16% 33% 28%	1800
	11th to 20th	Night	22% 4 7% 19% 30% 18%	1970
	21st to end	Night	23% 4 5% 26% 29% 14%	1980
October	1st to 10th	Night	28% 4 10% 27% 23% 7%	1980
	11th to 20th	Night	31% 4 11% 28% 22% 3	2225
	21st to end	Night	37% 6% 13% 23% 20% 2	2574
November	1st to 10th	Night	44% 5% 12% 23% 15% 2	2405
	11th to 20th	Night	47% 7% 12% 24% 10%	2470
	21st to end	Night	45% 5% 13% 23% 12% 3	2507
December	1st to 10th	Night	50% 8% 16% 16% 9% 1	2660
	11th to 20th	Night	59% 6% 12% 17% 5% 1	3276
	21st to end	Night	50% 6% 16% 19% 8% 1	4862

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% 18% 30% 21% 12% 1	180
	11th to 20th	Day	20% 11% 24% 23% 13% 8%	180
	21st to end	Day	17% 10% 30% 26% 14% 5%	198
February	1st to 10th	Day	26% 13% 29% 20% 10% 2	255
	11th to 20th	Day	21% 15% 36% 19% 8% 1	455
	21st to end	Day	21% 20% 29% 23% 7%	382
March	1st to 10th	Day	20% 21% 32% 24% 3	441
	11th to 20th	Day	19% 14% 29% 27% 9% 1	420
	21st to end	Day	20% 22% 31% 22% 5% 1	462
April	1st to 10th	Day	22% 19% 26% 21% 10% 1	420
	11th to 20th	Day	19% 20% 31% 21% 8% 1	412
	21st to end	Day	17% 21% 30% 21% 9% 1	420
May	1st to 10th	Day	12% 16% 33% 27% 10% 2	423
	11th to 20th	Day	21% 14% 28% 23% 12% 2	448
	21st to end	Day	12% 15% 24% 29% 16% 5%	485
June	1st to 10th	Day	11% 16% 30% 26% 13% 4	450
	11th to 20th	Day	16% 19% 33% 20% 10% 2	450
	21st to end	Day	4 13% 36% 29% 15% 4	450
July	1st to 10th	Day	2 10% 39% 34% 13% 2	446
	11th to 20th	Day	2 13% 38% 33% 11% 3	444
	21st to end	Day	2 8% 33% 38% 16% 2	487
August	1st to 10th	Day	5% 10% 33% 36% 14% 2	447
	11th to 20th	Day	2 7% 27% 41% 21% 3	437
	21st to end	Day	5% 10% 31% 35% 17% 2	495
September	1st to 10th	Day	6% 8% 27% 37% 19% 3	450
	11th to 20th	Day	10% 8% 30% 33% 18% 2	450
	21st to end	Day	8% 10% 33% 34% 14% 2	450
October	1st to 10th	Day	12% 11% 26% 32% 17% 3	450
	11th to 20th	Day	14% 10% 25% 31% 16% 5%	330
	21st to end	Day	16% 16% 22% 29% 13% 3	297
November	1st to 10th	Day	21% 10% 25% 27% 15% 1	270
	11th to 20th	Day	16% 10% 27% 30% 13% 3	270
	21st to end	Day	15% 7% 28% 31% 16% 2	252
December	1st to 10th	Day	28% 9% 19% 23% 14% 7%	180
	11th to 20th	Day	26% 10% 24% 27% 11% 2	180
	21st to end	Day	19% 13% 24% 31% 11% 3	198
January	1st to 10th	Night	25% 6% 20% 32% 15% 3	760
	11th to 20th	Night	26% 5% 20% 29% 18% 3	760
	21st to end	Night	21% 4 21% 32% 19% 3	836
February	1st to 10th	Night	23% 7% 25% 31% 12% 1	760
	11th to 20th	Night	21% 5% 25% 34% 14% 1	744
	21st to end	Night	19% 7% 24% 35% 14% 2	628
March	1st to 10th	Night	20% 8% 24% 34% 12% 2	742
	11th to 20th	Night	17% 5% 21% 39% 17% 1	720
	21st to end	Night	21% 7% 22% 36% 13% 1	792
April	1st to 10th	Night	17% 6% 20% 37% 18% 2	720
	11th to 20th	Night	14% 9% 26% 36% 14% 2	651
	21st to end	Night	11% 6% 21% 43% 17% 1	540
May	1st to 10th	Night	8% 7% 20% 43% 22% 1	540
	11th to 20th	Night	10% 5% 19% 35% 29% 2	450
	21st to end	Night	11% 5% 14% 39% 29% 2	389
June	1st to 10th	Night	12% 4 13% 43% 25% 3	360
	11th to 20th	Night	10% 2 18% 44% 24% 2	360
	21st to end	Night	4 2 9% 54% 30% 1	360
July	1st to 10th	Night	1 12% 50% 34% 3	350
	11th to 20th	Night	2 1 13% 58% 26% 1	348
	21st to end	Night	4 1 11% 48% 35% 2	394
August	1st to 10th	Night	5% 2 10% 47% 33% 2	451
	11th to 20th	Night	1 1 7% 45% 42% 3	534
	21st to end	Night	3 2 12% 49% 32% 3	746
September	1st to 10th	Night	5% 1 9% 52% 31% 2	720
	11th to 20th	Night	6% 2 10% 44% 34% 3	720
	21st to end	Night	9% 2 15% 38% 30% 6%	720
October	1st to 10th	Night	10% 2 15% 44% 27% 2	720
	11th to 20th	Night	13% 4 15% 41% 25% 2	720
	21st to end	Night	16% 3 21% 38% 19% 3	792
November	1st to 10th	Night	21% 5% 21% 35% 17% 2	740
	11th to 20th	Night	25% 5% 19% 35% 15% 2	760
	21st to end	Night	18% 5% 22% 36% 16% 3	760
December	1st to 10th	Night	21% 6% 22% 35% 14% 3	760
	11th to 20th	Night	25% 6% 21% 32% 13% 3	760
	21st to end	Night	29% 7% 24% 29% 10% 1	836

Page generated at 2024-03-03 04:28:56. Version ac07

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