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 2024-11-02.

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	8% 9% 3 6% 4 4 4 3 5% 6% 49%	101305
	Night	10% 10% 3 6% 4 4 4 3 5% 6% 47%	97832
Transparency	Day	36% 6% 8% 19% 19% 13%	101049
	Night	38% 5% 10% 20% 17% 9%	97677
Seeing	Day	13% 13% 30% 28% 13% 3	14408
	Night	15% 5% 19% 39% 21% 2	23696

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% 23% 8% 10% 5% 5% 4 4 5% 6% 22%	2539
	11th to 20th	Day	13% 18% 9% 9% 5% 4 3 3 4 4 27%	2540
	21st to end	Day	16% 18% 5% 8% 5% 4 4 3 4 6% 26%	2794
February	1st to 10th	Day	13% 18% 5% 10% 6% 4 4 3 4 5% 29%	1647
	11th to 20th	Day	12% 20% 4 7% 6% 5% 4 5% 4 6% 28%	1850
	21st to end	Day	11% 19% 7% 10% 7% 4 5% 3 6% 5% 23%	1570
March	1st to 10th	Day	9% 18% 8% 10% 6% 5% 4 3 4 6% 28%	3138
	11th to 20th	Day	8% 11% 3 6% 4 4 3 3 3 4 51%	3366
	21st to end	Day	12% 15% 4 11% 8% 7% 7% 4 6% 6% 20%	3977
April	1st to 10th	Day	12% 14% 4 9% 6% 5% 4 4 5% 7% 31%	2280
	11th to 20th	Day	9% 11% 3 8% 6% 5% 5% 4 5% 6% 39%	2311
	21st to end	Day	11% 10% 3 7% 5% 4 4 4 5% 6% 40%	2470
May	1st to 10th	Day	8% 12% 4 8% 5% 4 5% 4 5% 6% 39%	4110
	11th to 20th	Day	6% 5% 2 5% 4 4 4 3 5% 7% 57%	4213
	21st to end	Day	8% 8% 2 6% 5% 5% 4 4 6% 7% 45%	4813
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	9% 5% 2 6% 4 4 4 3 4 5% 52%	2090
	11th to 20th	Day	10% 6% 2 6% 3 3 4 3 5% 6% 52%	1825
	21st to end	Day	9% 9% 3 7% 5% 5% 4 4 4 6% 43%	1881
November	1st to 10th	Day	15% 12% 3 7% 4 4 3 3 6% 7% 35%	1683
	11th to 20th	Day	15% 14% 3 6% 5% 4 4 2 6% 6% 34%	1710
	21st to end	Day	11% 13% 4 7% 5% 4 4 4 5% 7% 36%	1672
December	1st to 10th	Day	16% 15% 4 8% 4 3 3 3 5% 6% 33%	1520
	11th to 20th	Day	16% 16% 5% 10% 4 5% 5% 3 6% 6% 26%	1928
	21st to end	Day	12% 12% 5% 9% 4 4 4 3 5% 6% 35%	2794
January	1st to 10th	Night	12% 19% 6% 9% 6% 4 4 4 5% 5% 26%	4406
	11th to 20th	Night	18% 19% 7% 9% 5% 4 3 3 3 5% 25%	4420
	21st to end	Night	18% 18% 4 9% 4 4 3 3 4 6% 27%	4862
February	1st to 10th	Night	14% 17% 4 9% 4 5% 3 4 4 5% 32%	2528
	11th to 20th	Night	11% 18% 4 7% 4 4 4 2 5% 5% 36%	2218
	21st to end	Night	11% 17% 6% 10% 5% 4 5% 3 5% 6% 28%	1884
March	1st to 10th	Night	10% 19% 4 7% 5% 4 3 3 5% 6% 34%	3736
	11th to 20th	Night	9% 12% 3 5% 3 3 3 3 4 4 50%	3614
	21st to end	Night	9% 13% 3 9% 6% 5% 6% 5% 7% 9% 29%	3674
April	1st to 10th	Night	12% 10% 3 5% 5% 4 5% 4 5% 6% 42%	1900
	11th to 20th	Night	11% 7% 3 6% 5% 5% 5% 3 5% 4 46%	1815
	21st to end	Night	8% 6% 2 6% 4 4 5% 4 5% 6% 50%	1710
May	1st to 10th	Night	10% 9% 2 4 3 3 4 4 6% 7% 48%	2860
	11th to 20th	Night	5% 3 1 4 3 3 4 4 5% 7% 61%	2682
	21st to end	Night	7% 7% 2 6% 5% 4 4 2 4 7% 51%	2762
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	8% 5% 2 4 4 3 3 3 5% 6% 58%	2090
	11th to 20th	Night	10% 5% 2 4 3 4 3 3 4 6% 56%	2349
	21st to end	Night	11% 8% 2 5% 4 4 5% 3 6% 7% 45%	2717
November	1st to 10th	Night	16% 9% 3 6% 4 4 3 3 5% 7% 40%	2418
	11th to 20th	Night	18% 10% 3 6% 4 4 4 4 6% 6% 36%	2470
	21st to end	Night	12% 12% 3 7% 4 4 4 3 5% 6% 40%	2507
December	1st to 10th	Night	13% 15% 3 7% 4 5% 5% 4 6% 6% 32%	2660
	11th to 20th	Night	15% 16% 5% 9% 6% 5% 5% 4 5% 5% 26%	3276
	21st to end	Night	13% 13% 4 8% 5% 4 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	57% 7% 7% 16% 13%	3138
	11th to 20th	Day	37% 5% 8% 34% 14% 1	3366
	21st to end	Day	59% 11% 10% 15% 5% 1	3977
April	1st to 10th	Day	52% 7% 13% 18% 9% 1	2280
	11th to 20th	Day	45% 6% 11% 21% 15% 2	2314
	21st to end	Day	44% 8% 10% 24% 14%	2470
May	1st to 10th	Day	44% 8% 7% 23% 17% 2	4110
	11th to 20th	Day	25% 7% 6% 30% 24% 8%	4216
	21st to end	Day	36% 8% 10% 31% 12% 3	4814
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	34% 5% 9% 22% 24% 6%	2090
	11th to 20th	Day	34% 5% 10% 27% 21% 3	1825
	21st to end	Day	42% 6% 12% 22% 17% 1	1881
November	1st to 10th	Day	48% 6% 12% 20% 13% 1	1683
	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	50% 7% 9% 19% 15% 1	3736
	11th to 20th	Night	38% 5% 9% 31% 15% 1	3614
	21st to end	Night	46% 11% 15% 20% 7%	3674
April	1st to 10th	Night	42% 6% 12% 25% 13% 1	1900
	11th to 20th	Night	41% 5% 11% 24% 17% 2	1815
	21st to end	Night	34% 7% 14% 27% 17% 1	1710
May	1st to 10th	Night	34% 7% 8% 29% 21% 3	2860
	11th to 20th	Night	21% 6% 9% 34% 28% 3	2682
	21st to end	Night	33% 5% 11% 36% 14% 1	2762
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	27% 4 9% 26% 24% 9%	2090
	11th to 20th	Night	30% 4 12% 28% 23% 4	2349
	21st to end	Night	37% 6% 12% 23% 20% 2	2717
November	1st to 10th	Night	44% 5% 12% 23% 15% 2	2418
	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% 20% 32% 24% 3	460
	11th to 20th	Day	18% 15% 28% 27% 10% 2	460
	21st to end	Day	19% 21% 31% 22% 5% 1	506
April	1st to 10th	Day	22% 19% 27% 21% 10% 1	460
	11th to 20th	Day	18% 20% 30% 22% 8% 1	452
	21st to end	Day	16% 21% 31% 22% 9% 1	460
May	1st to 10th	Day	13% 16% 34% 25% 10% 2	463
	11th to 20th	Day	20% 15% 28% 23% 12% 2	488
	21st to end	Day	12% 14% 26% 28% 16% 5%	529
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	15% 17% 21% 30% 14% 3	330
November	1st to 10th	Day	22% 10% 26% 27% 15% 1	273
	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% 25% 33% 12% 2	760
	11th to 20th	Night	17% 6% 21% 39% 17% 1	760
	21st to end	Night	20% 7% 22% 37% 13% 1	836
April	1st to 10th	Night	17% 7% 20% 37% 17% 2	760
	11th to 20th	Night	13% 8% 28% 37% 13% 1	687
	21st to end	Night	10% 7% 22% 43% 17% 1	570
May	1st to 10th	Night	9% 7% 21% 42% 21% 1	570
	11th to 20th	Night	9% 5% 20% 36% 28% 2	475
	21st to end	Night	11% 5% 15% 40% 27% 2	411
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	16% 3 21% 38% 19% 3	836
November	1st to 10th	Night	20% 5% 21% 35% 17% 2	744
	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 2024-10-29 23:22:54. Version ac07

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