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 2024-03-08.

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 TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(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

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
43%
24686
27%
79995
15%
24595
54%
24595
36%
43052

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
40%
939
29%
4343
14%
926
52%
926
27%
2221
January11th to 20thNight
39%
947
30%
4309
15%
930
51%
930
28%
2056
January21st to endNight
39%
1002
22%
4367
15%
990
52%
990
28%
2294
February1st to 10thNight
34%
760
25%
2280
12%
760
46%
760
30%
1348
February11th to 20thNight
30%
743
25%
2218
10%
740
44%
740
33%
1290
February21st to endNight
32%
628
33%
1884
13%
628
49%
628
40%
991
March1st to 10thNight
36%
750
28%
2250
10%
750
51%
750
40%
1183
March11th to 20thNight
39%
608
26%
2048
17%
608
49%
608
33%
1101
March21st to endNight
27%
594
24%
2102
11%
594
46%
594
27%
1188
April1st to 10thNight
28%
540
26%
1800
12%
540
47%
540
33%
942
April11th to 20thNight
26%
533
23%
1777
11%
533
44%
533
29%
980
April21st to endNight
34%
540
26%
1674
17%
540
50%
540
33%
949
May1st to 10thNight
33%
540
20%
1620
12%
540
45%
540
29%
983
May11th to 20thNight
39%
531
18%
1593
13%
531
48%
531
32%
941
May21st to endNight
34%
583
16%
1746
7%
582
44%
582
31%
1043
June1st to 10thNight
46%
540
21%
1472
9%
540
54%
540
42%
826
June11th to 20thNight
36%
540
26%
1440
9%
540
47%
540
41%
825
June21st to endNight
47%
540
23%
1440
11%
540
56%
540
43%
844
July1st to 10thNight
56%
525
19%
1400
13%
525
60%
525
38%
859
July11th to 20thNight
67%
522
26%
1392
20%
522
72%
522
50%
754
July21st to endNight
64%
591
20%
1624
18%
558
66%
558
36%
973
August1st to 10thNight
64%
537
21%
1601
21%
534
67%
534
34%
944
August11th to 20thNight
58%
534
24%
1744
23%
534
66%
534
35%
966
August21st to endNight
64%
594
27%
1980
28%
594
69%
594
42%
994
September1st to 10thNight
57%
540
28%
1818
25%
540
67%
540
41%
917
September11th to 20thNight
53%
540
31%
1980
25%
540
66%
540
41%
927
September21st to endNight
52%
540
33%
1980
27%
540
63%
540
43%
891
October1st to 10thNight
42%
540
32%
1980
22%
540
57%
540
33%
1023
October11th to 20thNight
46%
617
38%
2057
21%
617
61%
617
49%
926
October21st to endNight
46%
990
31%
2574
14%
990
55%
990
47%
1423
November1st to 10thNight
51%
925
33%
2405
14%
925
60%
925
55%
1243
November11th to 20thNight
45%
950
38%
2470
16%
950
58%
950
53%
1290
November21st to endNight
47%
950
32%
2470
16%
950
56%
950
46%
1362
December1st to 10thNight
41%
950
29%
2470
13%
950
52%
950
42%
1431
December11th to 20thNight
40%
948
33%
2939
15%
948
53%
948
38%
1529
December21st to endNight
39%
1035
20%
4748
14%
1026
52%
1026
23%
2595

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 ForecastData
Points
Cloud CoverDay
6%5%2442445%7%57%
78721
Night
6%5%2442445%7%56%
80905
TransparencyDay
27%5%12%26%23%8%
78435
Night
27%5%12%25%23%8%
80714
SeeingDay
9%7%28%34%18%4
14579
Night
9%8%35%36%11%1
24724

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
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
7%8%34324447%54%
2538
11th to 20thDay
5%6%25%5%35%6%47%51%
2540
21st to endDay
5%7%45%413346%58%
3118
February1st to 10thDay
6%8%46%423447%53%
1900
11th to 20thDay
45%26%6%44447%54%
1849
21st to endDay
46%345%33346%60%
1570
March1st to 10thDay
5%42442446%6%59%
1870
11th to 20thDay
9%6%34433346%57%
1912
21st to endDay
9%5%3442445%7%52%
2250
April1st to 10thDay
9%42332345%7%58%
2160
11th to 20thDay
11%4243345%6%9%51%
2131
21st to endDay
10%5%245%25%5%6%7%49%
2284
May1st to 10thDay
11%43433446%8%51%
2340
11th to 20thDay
10%5%2432446%8%52%
2302
21st to endDay
8%5%1442446%8%52%
2531
June1st to 10thDay
421332447%10%59%
2484
11th to 20thDay
5%32232335%8%63%
2520
21st to endDay
42134335%6%10%59%
2520
July1st to 10thDay
6%41443445%9%56%
2520
11th to 20thDay
32132245%7%10%62%
2520
21st to endDay
4324435%5%6%11%53%
2597
August1st to 10thDay
6%314425%5%8%9%52%
2328
11th to 20thDay
6%4245%3445%8%56%
2153
21st to endDay
5%41332345%7%63%
2376
September1st to 10thDay
8%41432345%7%59%
2142
11th to 20thDay
7%42332235%6%63%
1980
21st to endDay
6%31332335%6%65%
1980
October1st to 10thDay
12%424313337%58%
1980
11th to 20thDay
6%313223335%69%
1882
21st to endDay
8%5%1431333464%
1782
November1st to 10thDay
6%412223446%65%
1673
11th to 20thDay
4414323345%67%
1710
21st to endDay
7%5%23423345%63%
1710
December1st to 10thDay
45%25%43345%6%58%
1710
11th to 20thDay
6%5%24323347%61%
2065
21st to endDay
5%12%5%8%5%34436%45%
2794
January1st to 10thNight
5%6%26%5%35%446%54%
4417
11th to 20thNight
3435%5%34446%58%
4430
21st to endNight
5%7%3442445%6%56%
4575
February1st to 10thNight
7%8%46%43345%6%51%
2280
11th to 20thNight
5%6%36%5%35%5%6%6%50%
2218
21st to endNight
46%35%41335%6%61%
1884
March1st to 10thNight
6%5%2432445%8%58%
2250
11th to 20thNight
8%5%26%43345%6%56%
2048
21st to endNight
9%5%25%43446%9%48%
2102
April1st to 10thNight
7%5%2442345%8%55%
1800
11th to 20thNight
11%6%135%3346%9%50%
1777
21st to endNight
11%5%2442335%8%52%
1674
May1st to 10thNight
10%5%25%425%5%5%8%48%
1620
11th to 20thNight
10%5%2443446%10%48%
1593
21st to endNight
10%5%13425%5%6%8%49%
1745
June1st to 10thNight
5%3134245%8%14%51%
1472
11th to 20thNight
5%424425%46%9%56%
1440
21st to endNight
44245%345%5%8%55%
1440
July1st to 10thNight
7%435%5%335%7%9%49%
1440
11th to 20thNight
33134345%7%11%57%
1440
21st to endNight
6%326%5%35%6%8%10%47%
1720
August1st to 10thNight
5%425%6%35%7%7%11%46%
1611
11th to 20thNight
6%425%5%25%5%7%9%51%
1744
21st to endNight
431442446%9%58%
1980
September1st to 10thNight
6%4133345%5%6%60%
1818
11th to 20thNight
7%21332445%9%60%
1980
21st to endNight
7%31332435%6%64%
1980
October1st to 10thNight
11%424412346%57%
1980
11th to 20thNight
7%212222235%71%
2057
21st to endNight
7%42332323466%
2574
November1st to 10thNight
4213323347%67%
2405
11th to 20thNight
4423213245%68%
2470
21st to endNight
5%42332445%6%61%
2470
December1st to 10thNight
45%345%24446%58%
2470
11th to 20thNight
5%5%24324348%60%
3128
21st to endNight
6%10%35%5%3445%6%50%
4873

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
31%5%10%28%21%4
2539
11th to 20thDay
34%6%12%21%21%6%
2540
21st to endDay
29%412%32%20%4
3118
February1st to 10thDay
33%312%28%17%7%
1900
11th to 20thDay
32%411%26%20%8%
1859
21st to endDay
27%39%22%26%12%
1570
March1st to 10thDay
25%410%24%25%12%
1870
11th to 20thDay
31%410%21%27%7%
1912
21st to endDay
31%5%14%27%17%5%
2250
April1st to 10thDay
26%411%24%25%10%
2160
11th to 20thDay
30%5%15%24%20%7%
2134
21st to endDay
33%6%12%24%21%5%
2284
May1st to 10thDay
31%5%12%28%19%4
2340
11th to 20thDay
30%7%18%30%14%2
2306
21st to endDay
29%7%17%26%15%6%
2531
June1st to 10thDay
19%7%19%34%17%5%
2484
11th to 20thDay
21%411%27%25%12%
2520
21st to endDay
21%6%10%26%27%10%
2520
July1st to 10thDay
27%6%10%26%26%5%
2451
11th to 20thDay
15%7%12%29%27%9%
2445
21st to endDay
25%7%16%33%18%2
2453
August1st to 10thDay
27%8%19%27%14%5%
2314
11th to 20thDay
27%5%10%28%24%6%
2153
21st to endDay
21%6%12%24%27%10%
2376
September1st to 10thDay
25%5%9%26%23%12%
2142
11th to 20thDay
23%48%25%29%12%
1980
21st to endDay
21%49%26%29%11%
1980
October1st to 10thDay
28%49%23%28%8%
1980
11th to 20thDay
20%38%24%30%15%
1882
21st to endDay
24%49%23%29%11%
1782
November1st to 10thDay
20%49%25%30%13%
1673
11th to 20thDay
20%38%28%31%10%
1710
21st to endDay
25%48%20%29%15%
1710
December1st to 10thDay
26%5%12%29%23%6%
1710
11th to 20thDay
25%38%31%29%4
2063
21st to endDay
41%5%8%22%19%5%
2794
January1st to 10thNight
30%5%10%30%20%3
4417
11th to 20thNight
26%6%13%25%22%8%
4430
21st to endNight
29%6%12%26%23%4
4575
February1st to 10thNight
35%412%22%19%7%
2280
11th to 20thNight
32%6%11%24%22%5%
2218
21st to endNight
25%46%23%28%14%
1884
March1st to 10thNight
25%410%20%28%13%
2250
11th to 20thNight
28%6%10%22%22%11%
2048
21st to endNight
32%7%13%25%18%6%
2102
April1st to 10thNight
27%5%11%23%23%10%
1800
11th to 20thNight
31%5%13%25%18%7%
1777
21st to endNight
30%6%12%26%22%4
1674
May1st to 10thNight
33%8%14%21%18%7%
1620
11th to 20thNight
31%7%18%25%16%3
1594
21st to endNight
30%9%21%23%10%6%
1746
June1st to 10thNight
22%9%22%28%16%4
1472
11th to 20thNight
25%6%14%24%23%8%
1440
21st to endNight
25%8%10%25%24%8%
1440
July1st to 10thNight
31%7%13%22%22%5%
1400
11th to 20thNight
19%8%14%27%25%7%
1392
21st to endNight
29%9%16%27%17%2
1624
August1st to 10thNight
30%8%16%28%14%4
1601
11th to 20thNight
28%7%13%29%17%6%
1744
21st to endNight
21%7%13%25%23%9%
1980
September1st to 10thNight
24%6%11%23%24%12%
1818
11th to 20thNight
21%6%11%22%28%12%
1980
21st to endNight
21%310%21%32%12%
1980
October1st to 10thNight
29%49%19%29%9%
1980
11th to 20thNight
18%38%21%32%18%
2057
21st to endNight
24%38%21%28%16%
2574
November1st to 10thNight
18%310%25%27%17%
2405
11th to 20thNight
19%37%26%33%12%
2470
21st to endNight
24%49%23%27%14%
2470
December1st to 10thNight
27%5%11%27%23%7%
2470
11th to 20thNight
25%37%30%30%5%
3129
21st to endNight
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
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
9%5%40%27%16%3
270
11th to 20thDay
13%7%36%31%11%2
270
21st to endDay
8%9%36%34%11%2
297
February1st to 10thDay
11%8%44%29%7%1
270
11th to 20thDay
6%9%44%27%11%1
270
21st to endDay
6%16%43%29%4
225
March1st to 10thDay
8%11%38%33%10%1
261
11th to 20thDay
14%11%35%27%12%1
240
21st to endDay
14%13%40%26%7%1
336
April1st to 10thDay
11%15%42%25%5%1
420
11th to 20thDay
13%17%40%26%5%1
412
21st to endDay
16%15%36%25%7%1
544
May1st to 10thDay
12%8%33%34%12%1
603
11th to 20thDay
16%8%28%32%13%4
625
21st to endDay
13%9%32%33%12%2
679
June1st to 10thDay
5%5%23%38%22%6%
630
11th to 20thDay
7%6%31%36%18%2
630
21st to endDay
5%327%42%20%3
630
July1st to 10thDay
7%219%39%28%5%
621
11th to 20thDay
3117%44%29%7%
618
21st to endDay
6%111%39%36%7%
684
August1st to 10thDay
7%213%36%38%5%
626
11th to 20thDay
5%218%42%30%3
467
21st to endDay
5%216%42%30%6%
495
September1st to 10thDay
10%217%42%23%6%
432
11th to 20thDay
4325%31%22%14%
270
21st to endDay
11%7%21%29%24%8%
270
October1st to 10thDay
17%6%23%25%22%8%
270
11th to 20thDay
5%6%33%36%15%4
270
21st to endDay
15%9%29%27%16%3
297
November1st to 10thDay
10%10%30%32%12%6%
270
11th to 20thDay
7%10%34%32%15%2
270
21st to endDay
15%12%30%28%13%3
270
December1st to 10thDay
6%8%35%37%13%2
270
11th to 20thDay
11%11%38%30%10%
270
21st to endDay
14%13%35%30%9%
297
January1st to 10thNight
7%7%38%36%11%1
950
11th to 20thNight
9%9%37%33%11%1
950
21st to endNight
5%8%42%36%8%1
1012
February1st to 10thNight
10%11%38%34%7%
760
11th to 20thNight
9%10%46%28%7%1
744
21st to endNight
7%11%46%32%5%
628
March1st to 10thNight
8%12%41%33%7%
750
11th to 20thNight
11%10%36%32%10%1
608
21st to endNight
14%11%45%25%5%
594
April1st to 10thNight
9%15%45%28%4
540
11th to 20thNight
13%15%42%24%5%
533
21st to endNight
15%12%36%27%9%1
540
May1st to 10thNight
12%10%40%30%8%1
540
11th to 20thNight
13%8%35%31%11%1
531
21st to endNight
13%9%40%28%10%
584
June1st to 10thNight
7%6%38%37%12%1
540
11th to 20thNight
7%9%43%34%5%
540
21st to endNight
5%5%36%44%10%
540
July1st to 10thNight
7%327%46%17%
525
11th to 20thNight
4123%52%18%2
522
21st to endNight
7%217%51%22%1
591
August1st to 10thNight
7%218%49%24%1
537
11th to 20thNight
7%126%50%15%
534
21st to endNight
6%323%48%19%2
594
September1st to 10thNight
7%228%47%15%1
540
11th to 20thNight
9%331%42%13%2
540
21st to endNight
9%6%29%40%16%
540
October1st to 10thNight
12%8%33%35%12%
540
11th to 20thNight
7%8%36%36%12%1
617
21st to endNight
10%9%32%34%15%1
990
November1st to 10thNight
6%6%35%41%12%1
925
11th to 20thNight
6%9%36%37%10%1
950
21st to endNight
8%9%33%36%13%2
950
December1st to 10thNight
8%9%37%36%9%
950
11th to 20thNight
9%10%35%35%10%1
950
21st to endNight
12%10%34%34%9%
1045
Page generated at 2024-03-05 06:24:03. Version ac07

Copyright © 2024 Attilla Danko.


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