Marienthal
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Marienthal clear sky chart from 2005-11-05 to 2018-01-20.

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
46%
16451
28%
48393
16%
16406
56%
16406
40%
26520

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 15thNight
43%
975
29%
2716
15%
970
54%
970
41%
1512
January16th to endNight
44%
964
36%
2638
18%
964
57%
964
48%
1384
February1st to 15thNight
35%
702
23%
2112
10%
699
46%
699
31%
1257
February16th to endNight
35%
632
32%
1894
14%
632
51%
632
39%
1020
March1st to 15thNight
43%
705
26%
2145
13%
705
53%
705
38%
1158
March16th to endNight
33%
576
25%
2061
15%
576
48%
576
30%
1099
April1st to 15thNight
28%
539
24%
1798
12%
539
43%
539
31%
985
April16th to endNight
32%
540
23%
1716
14%
540
48%
540
31%
992
May1st to 15thNight
39%
540
21%
1620
14%
540
50%
540
31%
965
May16th to endNight
38%
562
18%
1685
10%
561
49%
561
34%
969
June1st to 15thNight
39%
540
20%
1461
7%
540
49%
540
42%
827
June16th to endNight
50%
540
25%
1440
13%
540
58%
540
50%
786
July1st to 15thNight
61%
510
20%
1360
14%
510
65%
510
43%
789
July16th to endNight
69%
564
23%
1504
20%
531
71%
531
42%
851
August1st to 15thNight
64%
539
19%
1646
19%
536
67%
536
34%
971
August16th to endNight
63%
573
26%
1910
26%
573
69%
573
38%
1006
September1st to 15thNight
56%
540
25%
1872
22%
540
66%
540
37%
973
September16th to endNight
54%
537
33%
1980
27%
537
65%
537
42%
907
October1st to 15thNight
43%
540
32%
1980
23%
540
56%
540
32%
1026
October16th to endNight
52%
893
36%
2429
19%
893
62%
893
54%
1231
November1st to 15thNight
51%
950
34%
2470
15%
950
61%
950
54%
1284
November16th to endNight
49%
975
37%
2535
18%
975
59%
975
51%
1350
December1st to 15thNight
42%
975
28%
2535
13%
975
52%
975
41%
1473
December16th to endNight
43%
1040
30%
2886
15%
1040
54%
1040
36%
1705

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%41332335%7%57%
49141
Night
6%41332345%7%57%
48574
Cloud CoverDay
6%41332335%7%57%
49139
Night
6%41332345%7%57%
48574
TransparencyDay
26%412%26%22%6%
48825
Night
26%5%12%25%22%8%
48393
SeeingDay
8%6%27%34%18%3
6229
Night
8%7%33%37%12%
16454

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 15thDay
5%324322225%63%
1552
16th to endDay
45%24312247%62%
1697
February1st to 15thDay
5%6%25%5%23336%53%
1750
16th to endDay
45%33323346%58%
1580
March1st to 15thDay
5%31342336%6%58%
1815
16th to endDay
10%5%23313346%53%
2160
April1st to 15thDay
10%42332345%8%52%
2150
16th to endDay
12%42432445%7%48%
2244
May1st to 15thDay
9%32332436%7%53%
2331
16th to endDay
7%31432346%8%54%
2430
June1st to 15thDay
5%22232346%9%57%
2496
16th to endDay
211222235%9%64%
2520
July1st to 15thDay
4313325%46%10%53%
2520
16th to endDay
421332446%10%56%
2558
August1st to 15thDay
7%4244245%6%8%49%
2301
16th to endDay
6%413433446%56%
2292
September1st to 15thDay
9%41442335%7%53%
2088
16th to endDay
6%41221235%6%62%
1980
October1st to 15thDay
11%313313237%59%
1980
16th to endDay
5%212212245%68%
1782
November1st to 15thDay
5%412322346%62%
1718
16th to endDay
431331323466%
1755
December1st to 15thDay
5%6%24323335%58%
1755
16th to endDay
5%6%25%322348%54%
1687
January1st to 15thNight
4425%42333460%
2716
16th to endNight
341331224466%
2638
February1st to 15thNight
6%6%35%42335%5%51%
2102
16th to endNight
342442345%6%58%
1894
March1st to 15thNight
5%42432345%6%56%
2145
16th to endNight
9%41332325%8%54%
2061
April1st to 15thNight
9%5%1442245%8%50%
1798
16th to endNight
12%6%2332235%7%50%
1716
May1st to 15thNight
8%424415%5%48%50%
1619
16th to endNight
8%31242446%9%52%
1683
June1st to 15thNight
5%2123245%8%12%50%
1461
16th to endNight
221342345%8%60%
1440
July1st to 15thNight
43244235%7%10%50%
1440
16th to endNight
43134245%7%10%52%
1608
August1st to 15thNight
43145%36%6%7%11%44%
1656
16th to endNight
421442345%8%56%
1910
September1st to 15thNight
8%21233445%8%55%
1872
16th to endNight
5%21321425%6%62%
1980
October1st to 15thNight
12%413312345%57%
1980
16th to endNight
5%212212235%69%
2429
November1st to 15thNight
3212213346%66%
2470
16th to endNight
5%31221335%6%64%
2535
December1st to 15thNight
5%5%24423346%57%
2535
16th to endNight
7%5%24423335%54%
2886

Percentage Cloud Cover SE (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 15thDay
5%313413236%63%
1552
16th to endDay
45%14312237%62%
1697
February1st to 15thDay
5%7%246%23346%53%
1750
16th to endDay
46%24323446%58%
1580
March1st to 15thDay
441333336%6%58%
1815
16th to endDay
10%5%3332335%6%53%
2158
April1st to 15thDay
10%41322335%8%52%
2150
16th to endDay
12%5%2432445%8%47%
2244
May1st to 15thDay
9%41332446%7%52%
2331
16th to endDay
8%31432436%8%54%
2430
June1st to 15thDay
431331446%9%57%
2496
16th to endDay
211231336%9%64%
2520
July1st to 15thDay
4313325%46%9%53%
2520
16th to endDay
421332346%11%55%
2558
August1st to 15thDay
7%41342446%9%48%
2301
16th to endDay
6%413324446%56%
2292
September1st to 15thDay
9%413323448%54%
2088
16th to endDay
5%41221335%5%62%
1980
October1st to 15thDay
11%313312236%59%
1980
16th to endDay
5%31221224468%
1782
November1st to 15thDay
5%412322446%62%
1718
16th to endDay
4314313235%66%
1755
December1st to 15thDay
6%5%24423335%57%
1755
16th to endDay
6%6%25%322338%54%
1687
January1st to 15thNight
4425%423335%60%
2716
16th to endNight
341331224466%
2638
February1st to 15thNight
6%6%36%42345%5%50%
2102
16th to endNight
342432345%6%58%
1894
March1st to 15thNight
5%42432445%6%56%
2145
16th to endNight
9%42341335%8%54%
2061
April1st to 15thNight
9%5%2333335%8%50%
1798
16th to endNight
12%6%2242335%7%49%
1716
May1st to 15thNight
8%5%23425%45%8%49%
1619
16th to endNight
8%31241446%10%50%
1683
June1st to 15thNight
5%3123245%8%11%51%
1461
16th to endNight
221332346%8%60%
1440
July1st to 15thNight
42244246%6%10%51%
1440
16th to endNight
5%2134335%7%10%52%
1608
August1st to 15thNight
42246%35%6%7%11%44%
1656
16th to endNight
421442445%8%56%
1910
September1st to 15thNight
7%21233445%8%55%
1872
16th to endNight
5%21321335%6%62%
1980
October1st to 15thNight
11%413212335%57%
1980
16th to endNight
5%32313235%69%
2429
November1st to 15thNight
3212213346%66%
2470
16th to endNight
5%31221335%6%63%
2535
December1st to 15thNight
5%5%24424337%56%
2535
16th to endNight
7%5%24423336%54%
2886

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 15thDay
25%213%30%22%4
1553
16th to endDay
23%312%34%22%4
1697
February1st to 15thDay
32%313%30%13%5%
1751
16th to endDay
26%313%23%24%8%
1580
March1st to 15thDay
25%313%24%24%9%
1815
16th to endDay
31%414%24%20%4
2160
April1st to 15thDay
30%5%12%25%21%5%
2150
16th to endDay
34%413%24%17%5%
2244
May1st to 15thDay
29%5%14%28%18%3
2331
16th to endDay
27%7%17%26%16%5%
2434
June1st to 15thDay
21%5%17%29%18%7%
2496
16th to endDay
16%410%28%27%11%
2520
July1st to 15thDay
25%6%10%26%25%6%
2371
16th to endDay
22%6%15%28%21%5%
2399
August1st to 15thDay
31%6%17%23%15%5%
2287
16th to endDay
26%6%10%26%22%6%
2292
September1st to 15thDay
29%5%11%26%18%9%
2088
16th to endDay
22%49%28%27%7%
1980
October1st to 15thDay
28%310%23%26%8%
1980
16th to endDay
19%39%25%33%9%
1782
November1st to 15thDay
22%310%24%26%12%
1718
16th to endDay
21%37%23%30%12%
1755
December1st to 15thDay
29%411%29%21%3
1755
16th to endDay
28%411%28%21%4
1687
January1st to 15thNight
27%39%30%24%5%
2716
16th to endNight
21%39%30%28%7%
2638
February1st to 15thNight
34%5%13%24%17%5%
2112
16th to endNight
26%48%27%23%9%
1894
March1st to 15thNight
27%410%22%25%10%
2145
16th to endNight
29%5%12%23%19%9%
2061
April1st to 15thNight
30%411%26%20%6%
1798
16th to endNight
32%5%14%24%18%4
1716
May1st to 15thNight
31%7%13%22%19%5%
1620
16th to endNight
27%8%20%21%14%6%
1685
June1st to 15thNight
23%7%20%25%17%4
1461
16th to endNight
20%5%12%25%26%8%
1440
July1st to 15thNight
25%6%13%25%21%6%
1360
16th to endNight
24%8%17%24%20%5%
1504
August1st to 15thNight
31%7%17%25%12%5%
1646
16th to endNight
24%7%10%29%20%7%
1910
September1st to 15thNight
25%6%12%25%20%9%
1872
16th to endNight
21%311%22%30%10%
1980
October1st to 15thNight
29%49%18%28%10%
1980
16th to endNight
19%28%22%30%16%
2429
November1st to 15thNight
18%39%24%27%16%
2470
16th to endNight
20%38%25%28%13%
2535
December1st to 15thNight
28%311%30%20%5%
2535
16th to endNight
31%411%24%23%4
2886

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 15thDay
11%438%30%14%1
135
16th to endDay
9%9%36%23%18%2
109
February1st to 15thDay
10%6%44%31%5%2
90
16th to endDay
16%44%28%9%1
81
March1st to 15thDay
310%33%34%17%1
90
16th to endDay
12%12%32%28%12%1
144
April1st to 15thDay
10%18%42%23%31
269
16th to endDay
19%13%35%24%5%
354
May1st to 15thDay
10%10%33%29%13%2
468
16th to endDay
12%8%30%34%13%
517
June1st to 15thDay
5%6%28%36%18%4
495
16th to endDay
3427%41%20%3
495
July1st to 15thDay
5%120%40%26%5%
475
16th to endDay
5%11%41%32%6%
515
August1st to 15thDay
8%116%37%33%2
454
16th to endDay
6%220%43%21%4
332
September1st to 15thDay
6%223%38%20%8%
243
16th to endDay
13%7%24%21%25%8%
135
October1st to 15thDay
11%5%27%34%15%5%
135
16th to endDay
6%11%26%34%16%4
144
November1st to 15thDay
14%5%24%30%21%4
135
16th to endDay
13%13%31%27%13%1
135
December1st to 15thDay
7%13%36%31%10%1
135
16th to endDay
10%8%42%30%8%
144
January1st to 15thNight
6%7%35%37%11%1
975
16th to endNight
6%9%37%36%10%
964
February1st to 15thNight
9%8%40%33%7%
704
16th to endNight
6%10%42%33%5%
632
March1st to 15thNight
6%10%36%35%9%
705
16th to endNight
11%11%39%28%8%
576
April1st to 15thNight
11%13%44%26%3
539
16th to endNight
16%11%37%29%5%
540
May1st to 15thNight
10%10%37%31%10%1
540
16th to endNight
9%9%39%30%10%
563
June1st to 15thNight
6%8%43%31%10%
540
16th to endNight
3436%43%11%
540
July1st to 15thNight
4126%49%17%
510
16th to endNight
6%116%52%22%1
564
August1st to 15thNight
7%19%48%23%
539
16th to endNight
4124%47%20%1
573
September1st to 15thNight
8%128%42%17%1
540
16th to endNight
6%5%29%39%17%1
537
October1st to 15thNight
13%8%30%35%11%
540
16th to endNight
7%6%31%36%17%
893
November1st to 15thNight
5%6%32%41%12%
950
16th to endNight
7%8%32%37%12%1
975
December1st to 15thNight
8%9%36%38%7%
975
16th to endNight
10%8%32%36%10%
1040
Page generated at 2018-01-21 11:19:31. Version ac04

Copyright 2018 A. Danko


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