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 2017-09-20.

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%
15896
27%
46828
16%
15851
56%
15851
40%
25660

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%
900
30%
2506
16%
895
54%
895
42%
1381
January16th to endNight
43%
939
34%
2568
17%
939
55%
939
47%
1359
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
54%
705
38%
1158
March16th to endNight
32%
576
25%
2061
15%
576
48%
576
30%
1099
April1st to 15thNight
28%
539
24%
1798
12%
539
44%
539
31%
985
April16th to endNight
32%
540
23%
1716
14%
540
48%
540
31%
992
May1st to 15thNight
38%
540
21%
1620
14%
540
49%
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
63%
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
57%
540
25%
1872
22%
540
66%
540
37%
973
September16th to endNight
55%
507
33%
1870
28%
507
66%
507
44%
830
October1st to 15thNight
46%
495
33%
1815
24%
495
59%
495
33%
929
October16th to endNight
53%
818
34%
2226
18%
818
61%
818
53%
1140
November1st to 15thNight
53%
875
35%
2275
15%
875
63%
875
55%
1169
November16th to endNight
48%
900
35%
2340
17%
900
59%
900
50%
1255
December1st to 15thNight
41%
900
28%
2340
12%
900
51%
900
40%
1375
December16th to endNight
43%
960
29%
2664
15%
960
54%
960
36%
1574

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%
48018
Night
6%41332345%7%57%
47009
Cloud CoverDay
6%41332335%7%56%
48016
Night
6%41332345%7%56%
47009
TransparencyDay
26%412%26%21%6%
47702
Night
26%5%12%25%22%8%
46828
SeeingDay
8%6%27%34%19%3
5862
Night
8%7%33%37%12%
15899

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%424322225%64%
1432
16th to endDay
45%24312247%61%
1663
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
5%31221235%6%64%
1859
October1st to 15thDay
11%313313237%58%
1815
16th to endDay
6%313212235%67%
1634
November1st to 15thDay
5%312222346%64%
1583
16th to endDay
5%31331324466%
1620
December1st to 15thDay
6%6%25%423335%56%
1620
16th to endDay
6%6%25%322348%54%
1557
January1st to 15thNight
4425%413335%61%
2506
16th to endNight
3413312245%65%
2568
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
411321425%6%64%
1870
October1st to 15thNight
12%413312345%58%
1815
16th to endNight
5%312212235%68%
2226
November1st to 15thNight
41221335%6%67%
2275
16th to endNight
5%312213346%64%
2340
December1st to 15thNight
5%6%24424347%55%
2340
16th to endNight
8%6%24423436%54%
2664

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%413423236%63%
1432
16th to endDay
5%5%14312247%61%
1663
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%31221335%5%64%
1859
October1st to 15thDay
11%313312236%59%
1815
16th to endDay
6%31221223467%
1634
November1st to 15thDay
5%312322446%64%
1583
16th to endDay
5%314213335%65%
1620
December1st to 15thDay
6%6%24423336%55%
1620
16th to endDay
6%6%25%322338%54%
1557
January1st to 15thNight
4425%423335%61%
2506
16th to endNight
3413412345%65%
2568
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
411321335%6%64%
1870
October1st to 15thNight
11%413212335%58%
1815
16th to endNight
6%32213235%68%
2226
November1st to 15thNight
412213346%67%
2275
16th to endNight
5%31221335%6%63%
2340
December1st to 15thNight
5%5%24424337%55%
2340
16th to endNight
7%6%24423336%54%
2664

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%212%30%22%5%
1433
16th to endDay
24%312%34%20%4
1663
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
19%49%30%28%7%
1859
October1st to 15thDay
28%310%24%26%7%
1815
16th to endDay
20%38%25%32%9%
1634
November1st to 15thDay
20%310%24%28%13%
1583
16th to endDay
22%37%23%30%12%
1620
December1st to 15thDay
30%412%29%20%3
1620
16th to endDay
28%312%29%20%4
1557
January1st to 15thNight
26%39%30%25%5%
2506
16th to endNight
22%39%30%27%7%
2568
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
19%311%23%31%10%
1870
October1st to 15thNight
28%49%19%28%9%
1815
16th to endNight
19%29%23%29%15%
2226
November1st to 15thNight
17%39%22%28%17%
2275
16th to endNight
21%37%25%28%13%
2340
December1st to 15thNight
29%312%30%19%4
2340
16th to endNight
31%412%23%23%4
2664

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
12%136%31%16%2
90
16th to endDay
10%10%40%20%16%1
96
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
7%7%24%18%30%10%
102
October1st to 15thDay
8%326%35%16%8%
90
16th to endDay
9%225%40%19%3
96
November1st to 15thDay
6%6%23%27%28%6%
90
16th to endDay
20%14%30%22%11%2
90
December1st to 15thDay
11%8%35%31%11%2
90
16th to endDay
15%7%36%32%8%
96
January1st to 15thNight
6%8%35%36%12%1
900
16th to endNight
6%9%37%37%8%
939
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
5%430%39%18%1
507
October1st to 15thNight
12%8%28%36%12%
495
16th to endNight
7%6%31%36%17%
818
November1st to 15thNight
5%6%32%42%12%
875
16th to endNight
7%8%33%37%12%1
900
December1st to 15thNight
9%9%35%38%7%
900
16th to endNight
11%8%31%36%11%
960
Page generated at 2017-09-21 06:18:16. Version ac04

Copyright 2017 A. Danko


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