Marienthal
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Marienthal 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	6% 5% 2 4 3 3 3 3 5% 7% 58%	101056
	Night	6% 5% 2 5% 4 4 4 3 5% 7% 55%	98095
Transparency	Day	26% 5% 12% 26% 24% 8%	100807
	Night	27% 6% 12% 24% 23% 8%	97933
Seeing	Day	9% 7% 29% 34% 18% 4	15571
	Night	9% 8% 35% 37% 11% 1	25479

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	7% 8% 3 5% 2 3 3 4 4 7% 53%	2538
	11th to 20th	Day	5% 7% 2 6% 4 4 6% 4 4 7% 50%	2540
	21st to end	Day	5% 7% 3 6% 3 2 3 2 4 6% 58%	3118
February	1st to 10th	Day	6% 9% 3 6% 4 3 3 3 4 7% 53%	1900
	11th to 20th	Day	4 6% 2 6% 5% 5% 3 3 4 7% 54%	1849
	21st to end	Day	4 6% 3 5% 4 4 3 3 4 5% 60%	1570
March	1st to 10th	Day	4 6% 2 4 3 3 3 3 5% 5% 64%	3130
	11th to 20th	Day	7% 4 2 4 3 3 3 3 5% 6% 60%	3373
	21st to end	Day	6% 6% 2 5% 3 3 4 3 6% 7% 54%	3941
April	1st to 10th	Day	8% 5% 1 4 3 3 3 3 5% 7% 58%	2280
	11th to 20th	Day	11% 4 1 4 3 4 3 4 5% 9% 52%	2251
	21st to end	Day	10% 5% 2 5% 4 3 5% 4 7% 7% 49%	2411
May	1st to 10th	Day	9% 6% 2 5% 3 3 4 4 6% 7% 51%	4120
	11th to 20th	Day	7% 4 2 5% 3 4 4 4 7% 9% 52%	4082
	21st to end	Day	7% 4 1 4 4 3 4 3 6% 8% 57%	4489
June	1st to 10th	Day	4 2 1 3 3 3 4 3 7% 10% 59%	2622
	11th to 20th	Day	6% 4 1 3 3 3 3 2 5% 7% 63%	2660
	21st to end	Day	4 3 1 4 4 3 3 4 6% 9% 58%	2660
July	1st to 10th	Day	6% 5% 2 5% 4 4 4 3 6% 8% 53%	4430
	11th to 20th	Day	2 2 1 3 2 2 4 4 7% 9% 64%	4430
	21st to end	Day	2 2 1 4 3 3 4 4 6% 9% 61%	4543
August	1st to 10th	Day	13% 4 2 4 3 3 3 4 6% 8% 51%	4103
	11th to 20th	Day	6% 4 1 4 3 4 4 4 6% 8% 57%	3769
	21st to end	Day	3 3 1 4 3 3 4 4 6% 8% 60%	4180
September	1st to 10th	Day	8% 4 1 4 2 3 3 3 5% 7% 60%	2260
	11th to 20th	Day	7% 4 2 3 3 2 2 3 5% 6% 64%	2090
	21st to end	Day	6% 3 1 4 2 2 3 2 5% 6% 65%	2090
October	1st to 10th	Day	11% 4 1 4 3 2 3 2 3 7% 60%	2090
	11th to 20th	Day	6% 3 1 3 2 3 3 2 4 5% 68%	1985
	21st to end	Day	7% 5% 1 4 2 2 3 2 3 4 65%	1881
November	1st to 10th	Day	6% 4 1 2 2 3 3 3 4 6% 65%	1682
	11th to 20th	Day	4 4 1 4 3 3 3 2 5% 5% 67%	1710
	21st to end	Day	7% 5% 2 4 3 3 3 2 4 5% 63%	1710
December	1st to 10th	Day	4 6% 2 5% 3 3 3 3 5% 6% 58%	1710
	11th to 20th	Day	6% 6% 2 4 2 3 3 3 5% 6% 61%	2065
	21st to end	Day	5% 12% 5% 9% 4 4 4 3 3 6% 45%	2794
January	1st to 10th	Night	5% 6% 2 6% 4 4 4 3 4 6% 54%	4417
	11th to 20th	Night	3 4 3 6% 4 4 4 3 4 6% 58%	4430
	21st to end	Night	5% 7% 3 5% 4 3 3 3 5% 6% 56%	4575
February	1st to 10th	Night	7% 8% 3 7% 4 4 3 3 5% 6% 51%	2280
	11th to 20th	Night	5% 7% 3 6% 4 4 5% 4 6% 6% 50%	2218
	21st to end	Night	4 6% 3 6% 3 2 3 2 5% 5% 61%	1884
March	1st to 10th	Night	5% 5% 2 3 2 3 3 3 5% 6% 64%	3734
	11th to 20th	Night	6% 5% 2 6% 3 3 3 3 5% 7% 57%	3590
	21st to end	Night	6% 5% 2 5% 3 3 4 3 6% 8% 54%	3677
April	1st to 10th	Night	6% 6% 2 5% 3 3 3 3 6% 8% 55%	1900
	11th to 20th	Night	10% 6% 2 4 4 3 4 3 6% 8% 50%	1877
	21st to end	Night	11% 5% 2 4 3 4 4 3 6% 8% 51%	1767
May	1st to 10th	Night	9% 6% 2 6% 4 4 5% 3 5% 8% 48%	2850
	11th to 20th	Night	8% 6% 3 7% 4 5% 4 4 5% 8% 45%	2823
	21st to end	Night	10% 5% 2 4 4 4 4 4 6% 7% 50%	3098
June	1st to 10th	Night	5% 3 1 3 3 4 4 4 9% 12% 51%	1553
	11th to 20th	Night	5% 4 2 5% 3 4 4 4 6% 9% 55%	1520
	21st to end	Night	4 4 2 5% 4 4 4 4 6% 8% 54%	1520
July	1st to 10th	Night	7% 5% 2 6% 4 4 3 3 6% 8% 51%	2540
	11th to 20th	Night	3 3 2 5% 4 4 5% 4 8% 12% 50%	2540
	21st to end	Night	3 2 1 5% 3 3 4 5% 8% 11% 53%	3006
August	1st to 10th	Night	9% 5% 2 6% 5% 4 5% 5% 7% 10% 42%	2836
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 4 7% 9% 44%	3053
	21st to end	Night	3 3 2 6% 5% 6% 6% 4 8% 11% 46%	3487
September	1st to 10th	Night	6% 3 1 3 3 3 4 4 5% 6% 61%	1919
	11th to 20th	Night	7% 2 1 4 3 3 4 3 5% 9% 60%	2090
	21st to end	Night	7% 3 1 4 2 3 3 2 5% 6% 65%	2090
October	1st to 10th	Night	11% 4 2 5% 3 2 2 2 4 6% 59%	2090
	11th to 20th	Night	6% 3 1 2 2 3 2 2 3 6% 70%	2172
	21st to end	Night	7% 4 2 4 2 2 3 2 3 4 66%	2717
November	1st to 10th	Night	4 2 1 4 3 3 3 3 5% 6% 67%	2431
	11th to 20th	Night	4 4 2 3 2 2 3 2 4 5% 68%	2470
	21st to end	Night	5% 5% 1 4 3 3 4 3 5% 6% 61%	2470
December	1st to 10th	Night	4 6% 2 5% 4 3 4 3 4 6% 58%	2470
	11th to 20th	Night	5% 5% 2 4 3 3 3 2 5% 8% 59%	3128
	21st to end	Night	6% 10% 3 6% 4 4 4 4 5% 6% 50%	4873

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	31% 5% 10% 28% 21% 4	2539
	11th to 20th	Day	34% 6% 12% 21% 21% 6%	2540
	21st to end	Day	29% 4 12% 32% 20% 4	3118
February	1st to 10th	Day	33% 3 12% 28% 17% 7%	1900
	11th to 20th	Day	32% 4 11% 26% 20% 8%	1859
	21st to end	Day	27% 3 9% 22% 26% 12%	1570
March	1st to 10th	Day	22% 4 8% 18% 28% 19%	3130
	11th to 20th	Day	25% 5% 9% 24% 31% 5%	3373
	21st to end	Day	28% 6% 13% 35% 14% 5%	3941
April	1st to 10th	Day	25% 5% 11% 24% 25% 10%	2280
	11th to 20th	Day	29% 5% 14% 24% 20% 8%	2254
	21st to end	Day	32% 6% 12% 25% 20% 4	2411
May	1st to 10th	Day	30% 7% 11% 26% 15% 11%	4120
	11th to 20th	Day	26% 9% 16% 28% 18% 2	4086
	21st to end	Day	24% 8% 14% 22% 25% 7%	4489
June	1st to 10th	Day	19% 7% 19% 35% 17% 5%	2622
	11th to 20th	Day	21% 4 11% 27% 25% 11%	2660
	21st to end	Day	22% 5% 10% 26% 26% 10%	2660
July	1st to 10th	Day	29% 6% 8% 22% 27% 7%	4361
	11th to 20th	Day	14% 5% 15% 28% 30% 8%	4355
	21st to end	Day	19% 6% 14% 27% 24% 11%	4399
August	1st to 10th	Day	32% 5% 15% 27% 18% 3	4090
	11th to 20th	Day	26% 6% 15% 23% 26% 5%	3806
	21st to end	Day	21% 5% 13% 29% 23% 9%	4179
September	1st to 10th	Day	24% 5% 9% 26% 23% 13%	2260
	11th to 20th	Day	22% 4 8% 26% 29% 11%	2090
	21st to end	Day	21% 4 8% 26% 28% 13%	2090
October	1st to 10th	Day	27% 4 9% 23% 29% 9%	2090
	11th to 20th	Day	20% 3 8% 24% 30% 15%	1985
	21st to end	Day	23% 4 9% 23% 30% 11%	1881
November	1st to 10th	Day	20% 4 9% 25% 30% 13%	1682
	11th to 20th	Day	20% 3 8% 28% 31% 10%	1710
	21st to end	Day	25% 4 8% 20% 29% 15%	1710
December	1st to 10th	Day	26% 5% 12% 29% 23% 6%	1710
	11th to 20th	Day	25% 3 8% 31% 29% 4	2063
	21st to end	Day	41% 5% 8% 22% 19% 5%	2794
January	1st to 10th	Night	30% 5% 10% 30% 20% 3	4417
	11th to 20th	Night	26% 6% 13% 25% 22% 8%	4430
	21st to end	Night	29% 6% 12% 26% 23% 4	4575
February	1st to 10th	Night	35% 4 12% 22% 19% 7%	2280
	11th to 20th	Night	32% 6% 11% 24% 22% 5%	2218
	21st to end	Night	25% 4 6% 23% 28% 14%	1884
March	1st to 10th	Night	21% 4 8% 19% 30% 18%	3734
	11th to 20th	Night	26% 7% 11% 21% 26% 10%	3590
	21st to end	Night	26% 7% 16% 32% 14% 4	3677
April	1st to 10th	Night	26% 5% 11% 24% 23% 11%	1900
	11th to 20th	Night	31% 6% 13% 25% 18% 8%	1877
	21st to end	Night	30% 6% 12% 27% 22% 4	1767
May	1st to 10th	Night	31% 10% 16% 17% 17% 9%	2850
	11th to 20th	Night	34% 9% 13% 21% 19% 3	2824
	21st to end	Night	29% 9% 15% 21% 16% 9%	3099
June	1st to 10th	Night	22% 10% 22% 28% 16% 3	1553
	11th to 20th	Night	26% 6% 13% 24% 22% 8%	1520
	21st to end	Night	26% 8% 10% 25% 24% 8%	1520
July	1st to 10th	Night	31% 6% 15% 18% 27% 4	2500
	11th to 20th	Night	25% 7% 17% 21% 25% 6%	2492
	21st to end	Night	21% 6% 17% 24% 23% 8%	2911
August	1st to 10th	Night	35% 6% 13% 26% 17% 3	2826
	11th to 20th	Night	35% 6% 13% 27% 16% 4	3081
	21st to end	Night	29% 7% 14% 23% 19% 8%	3487
September	1st to 10th	Night	23% 5% 11% 24% 24% 13%	1919
	11th to 20th	Night	22% 6% 10% 23% 27% 12%	2090
	21st to end	Night	21% 3 9% 22% 32% 13%	2090
October	1st to 10th	Night	28% 4 9% 19% 30% 11%	2090
	11th to 20th	Night	18% 3 9% 21% 31% 18%	2172
	21st to end	Night	23% 3 8% 21% 29% 15%	2717
November	1st to 10th	Night	18% 3 10% 25% 27% 17%	2431
	11th to 20th	Night	19% 3 7% 26% 33% 12%	2470
	21st to end	Night	24% 4 9% 23% 27% 14%	2470
December	1st to 10th	Night	27% 5% 11% 27% 23% 7%	2470
	11th to 20th	Night	25% 3 7% 30% 30% 5%	3129
	21st to end	Night	34% 6% 10% 26% 21% 4	4873

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	9% 5% 40% 27% 16% 3	270
	11th to 20th	Day	13% 7% 36% 31% 11% 2	270
	21st to end	Day	8% 9% 36% 34% 11% 2	297
February	1st to 10th	Day	11% 8% 44% 29% 7% 1	270
	11th to 20th	Day	6% 9% 44% 27% 11% 1	270
	21st to end	Day	6% 16% 43% 29% 4	225
March	1st to 10th	Day	8% 11% 38% 31% 10% 1	270
	11th to 20th	Day	13% 10% 37% 29% 11% 1	270
	21st to end	Day	14% 13% 39% 28% 6% 1	373
April	1st to 10th	Day	11% 16% 42% 25% 5% 1	460
	11th to 20th	Day	13% 16% 40% 25% 5% 1	452
	21st to end	Day	15% 15% 36% 25% 7% 1	591
May	1st to 10th	Day	12% 9% 35% 32% 11% 1	653
	11th to 20th	Day	16% 8% 28% 32% 13% 4	675
	21st to end	Day	12% 10% 32% 32% 12% 2	734
June	1st to 10th	Day	5% 5% 25% 39% 21% 6%	680
	11th to 20th	Day	7% 6% 31% 36% 18% 2	680
	21st to end	Day	6% 3 29% 40% 19% 3	680
July	1st to 10th	Day	7% 2 21% 37% 27% 5%	671
	11th to 20th	Day	3 1 17% 44% 28% 7%	668
	21st to end	Day	5% 2 12% 39% 35% 8%	739
August	1st to 10th	Day	8% 2 14% 36% 36% 4	676
	11th to 20th	Day	6% 2 18% 42% 30% 3	508
	21st to end	Day	5% 1 17% 42% 28% 6%	539
September	1st to 10th	Day	9% 2 16% 43% 24% 7%	470
	11th to 20th	Day	4 3 26% 33% 20% 13%	300
	21st to end	Day	12% 7% 20% 27% 27% 7%	300
October	1st to 10th	Day	15% 5% 21% 28% 23% 8%	300
	11th to 20th	Day	5% 7% 35% 35% 15% 4	300
	21st to end	Day	14% 10% 29% 27% 17% 3	330
November	1st to 10th	Day	10% 10% 30% 33% 12% 5%	273
	11th to 20th	Day	7% 10% 34% 32% 15% 2	270
	21st to end	Day	15% 12% 30% 28% 13% 3	270
December	1st to 10th	Day	6% 8% 35% 37% 13% 2	270
	11th to 20th	Day	11% 11% 38% 30% 10%	270
	21st to end	Day	14% 13% 35% 30% 9%	297
January	1st to 10th	Night	7% 7% 38% 36% 11% 1	950
	11th to 20th	Night	9% 9% 37% 33% 11% 1	950
	21st to end	Night	5% 8% 42% 36% 8% 1	1012
February	1st to 10th	Night	10% 11% 38% 34% 7%	760
	11th to 20th	Night	9% 10% 46% 28% 7% 1	744
	21st to end	Night	7% 11% 46% 32% 5%	628
March	1st to 10th	Night	8% 12% 40% 33% 7%	760
	11th to 20th	Night	11% 10% 36% 33% 10% 1	641
	21st to end	Night	14% 12% 45% 25% 5%	627
April	1st to 10th	Night	9% 15% 44% 28% 4	570
	11th to 20th	Night	13% 15% 42% 25% 5%	563
	21st to end	Night	15% 12% 36% 28% 8% 1	570
May	1st to 10th	Night	12% 11% 40% 29% 8% 1	570
	11th to 20th	Night	13% 8% 35% 32% 11% 1	561
	21st to end	Night	13% 9% 40% 28% 9%	617
June	1st to 10th	Night	7% 6% 37% 38% 11% 1	570
	11th to 20th	Night	8% 10% 43% 34% 5%	570
	21st to end	Night	6% 5% 37% 43% 10%	570
July	1st to 10th	Night	8% 3 28% 45% 16%	555
	11th to 20th	Night	4 1 24% 51% 18% 2	552
	21st to end	Night	7% 2 18% 51% 21% 1	624
August	1st to 10th	Night	8% 2 18% 49% 23% 1	567
	11th to 20th	Night	9% 1 27% 49% 14%	564
	21st to end	Night	5% 3 24% 48% 19% 2	627
September	1st to 10th	Night	7% 2 27% 48% 15% 1	570
	11th to 20th	Night	9% 3 32% 42% 13% 2	570
	21st to end	Night	9% 6% 28% 41% 16%	570
October	1st to 10th	Night	12% 8% 33% 35% 12%	570
	11th to 20th	Night	8% 8% 36% 36% 11% 1	652
	21st to end	Night	10% 9% 32% 34% 14%	1045
November	1st to 10th	Night	5% 6% 35% 41% 12% 1	935
	11th to 20th	Night	6% 9% 36% 37% 10% 1	950
	21st to end	Night	8% 9% 33% 36% 13% 2	950
December	1st to 10th	Night	8% 9% 37% 36% 9%	950
	11th to 20th	Night	9% 10% 35% 35% 10% 1	950
	21st to end	Night	12% 10% 34% 34% 9%	1045

Page generated at 2024-10-30 12:19:22. Version ac07

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