Marsing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Marsing clear sky chart from 2005-11-06 to 2024-11-05.

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
55%
23593
20%
97691
18%
23420
60%
23420
24%
54702

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
39%
751
6%
4388
6%
736
43%
736
8%
3265
January11th to 20thNight
39%
752
7%
4411
9%
740
43%
740
7%
3434
January21st to endNight
44%
829
6%
4812
9%
814
48%
814
8%
3608
February1st to 10thNight
41%
760
11%
2496
8%
760
46%
760
20%
1707
February11th to 20thNight
46%
741
16%
2219
12%
740
52%
740
24%
1472
February21st to endNight
43%
628
16%
1884
12%
628
49%
628
22%
1265
March1st to 10thNight
42%
755
21%
3691
12%
744
48%
744
17%
2094
March11th to 20thNight
50%
749
21%
3626
14%
740
56%
740
22%
1729
March21st to endNight
42%
822
10%
3520
8%
814
46%
814
16%
2254
April1st to 10thNight
48%
760
22%
1900
11%
760
53%
760
30%
1260
April11th to 20thNight
47%
736
23%
1864
10%
736
52%
736
32%
1197
April21st to endNight
54%
570
23%
1710
15%
570
60%
570
37%
962
May1st to 10thNight
52%
567
24%
2759
16%
559
59%
559
27%
1378
May11th to 20thNight
54%
439
22%
2510
21%
432
59%
432
29%
878
May21st to endNight
56%
403
15%
2729
20%
399
61%
399
17%
1190
June1st to 10thNight
56%
380
16%
1520
20%
380
63%
380
26%
840
June11th to 20thNight
51%
380
22%
1520
24%
380
65%
380
34%
737
June21st to endNight
67%
380
25%
1520
36%
380
75%
380
51%
587
July1st to 10thNight
72%
362
32%
2072
37%
360
82%
360
56%
550
July11th to 20thNight
74%
361
30%
1913
40%
359
84%
359
55%
571
July21st to endNight
76%
407
28%
2196
40%
383
85%
383
40%
793
August1st to 10thNight
75%
441
34%
2201
33%
433
81%
433
35%
927
August11th to 20thNight
81%
582
32%
2328
27%
570
86%
570
60%
825
August21st to endNight
76%
822
34%
2887
22%
814
80%
814
56%
1196
September1st to 10thNight
79%
760
40%
1900
24%
760
82%
760
68%
930
September11th to 20thNight
75%
760
35%
2050
27%
760
78%
760
55%
1051
September21st to endNight
72%
760
37%
2090
31%
760
76%
760
53%
1065
October1st to 10thNight
65%
743
44%
3080
22%
740
71%
740
39%
1262
October11th to 20thNight
64%
745
24%
3480
27%
740
71%
740
34%
1509
October21st to endNight
59%
825
26%
4263
23%
813
66%
813
23%
2106
November1st to 10thNight
53%
760
23%
2469
23%
760
58%
760
27%
1532
November11th to 20thNight
49%
760
18%
2470
16%
760
54%
760
23%
1594
November21st to endNight
52%
760
16%
2531
13%
760
58%
760
25%
1578
December1st to 10thNight
44%
760
12%
2660
9%
760
48%
760
17%
1843
December11th to 20thNight
43%
759
9%
3216
8%
759
47%
759
12%
2361
December21st to endNight
32%
824
7%
4806
7%
817
36%
817
8%
3152

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%25%44435%7%55%
105167
Night
8%7%36%44445%7%49%
102561
TransparencyDay
28%6%11%20%20%15%
104911
Night
33%7%12%19%18%12%
102406
SeeingDay
8%8%22%31%22%8%
14498
Night
10%6%22%37%22%3
23777

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
11%14%410%6%6%7%5%7%7%23%
2539
11th to 20thDay
12%15%412%7%6%6%47%6%21%
2540
21st to endDay
17%12%5%11%7%5%445%6%23%
2794
February1st to 10thDay
10%9%5%9%6%5%5%36%7%35%
1678
11th to 20thDay
8%11%38%6%5%6%5%6%8%36%
1850
21st to endDay
8%9%36%6%5%6%47%8%37%
1570
March1st to 10thDay
7%10%49%6%6%6%5%7%10%31%
3138
11th to 20thDay
5%7%25%33435%6%59%
3321
21st to endDay
7%8%38%7%7%7%6%8%10%30%
4062
April1st to 10thDay
9%8%36%5%5%5%47%7%42%
2280
11th to 20thDay
6%7%27%5%5%446%7%47%
2263
21st to endDay
7%7%25%44446%8%51%
2470
May1st to 10thDay
7%5%25%44445%6%53%
4110
11th to 20thDay
4313333246%68%
4268
21st to endDay
5%42444446%9%55%
4813
June1st to 10thDay
7%5%25%5%45%5%7%8%47%
2660
11th to 20thDay
5%32432436%8%60%
2660
21st to endDay
2212233345%73%
2660
July1st to 10thDay
11112223482%
4420
11th to 20thDay
112222235%80%
4420
21st to endDay
2212223235%76%
4790
August1st to 10thDay
331433435%6%65%
4282
11th to 20thDay
11212223481%
3975
21st to endDay
221322223378%
4180
September1st to 10thDay
2212222336%76%
2280
11th to 20thDay
4313333248%66%
2129
21st to endDay
5%313243246%67%
2090
October1st to 10thDay
431433323470%
3490
11th to 20thDay
6%415%34445%7%57%
3026
21st to endDay
5%5%26%45%5%46%9%49%
3101
November1st to 10thDay
11%7%36%5%6%5%47%8%39%
1710
11th to 20thDay
10%7%38%6%5%5%5%7%8%38%
1710
21st to endDay
8%9%38%6%6%6%5%6%8%34%
1646
December1st to 10thDay
12%11%49%5%6%45%6%8%31%
1520
11th to 20thDay
13%10%6%13%7%6%5%5%6%8%22%
1928
21st to endDay
9%10%5%12%7%6%6%5%6%7%27%
2794
January1st to 10thNight
12%16%5%11%6%6%5%5%6%8%20%
4406
11th to 20thNight
16%14%5%11%7%6%5%45%6%20%
4420
21st to endNight
16%12%5%12%6%5%5%35%5%26%
4862
February1st to 10thNight
11%11%48%5%5%5%46%8%34%
2496
11th to 20thNight
9%9%26%5%5%6%5%7%8%38%
2218
21st to endNight
9%9%38%6%45%5%7%8%36%
1884
March1st to 10thNight
8%9%28%5%5%5%5%7%8%37%
3736
11th to 20thNight
7%9%25%333346%55%
3659
21st to endNight
9%9%38%5%5%7%5%7%9%33%
3586
April1st to 10thNight
9%8%27%5%4445%8%44%
1900
11th to 20thNight
7%7%26%5%5%5%46%7%46%
1864
21st to endNight
7%5%25%4445%6%6%53%
1710
May1st to 10thNight
8%5%26%445%46%8%48%
2860
11th to 20thNight
431323445%6%65%
2626
21st to endNight
6%6%25%44435%7%53%
2762
June1st to 10thNight
7%5%16%6%5%35%7%10%45%
1520
11th to 20thNight
6%5%15%334346%60%
1520
21st to endNight
2113234347%69%
1520
July1st to 10thNight
111222124481%
2540
11th to 20thNight
11222345%80%
2540
21st to endNight
121434435%6%68%
2761
August1st to 10thNight
232433445%6%63%
2651
11th to 20thNight
112122245%78%
2864
21st to endNight
321322213478%
3498
September1st to 10thNight
222223245%76%
1900
11th to 20thNight
431423335%6%66%
2050
21st to endNight
6%313223346%68%
2090
October1st to 10thNight
431323433470%
3490
11th to 20thNight
5%42433335%7%62%
3903
21st to endNight
6%5%27%445%36%8%49%
4457
November1st to 10thNight
11%8%37%44445%7%43%
2469
11th to 20thNight
12%8%36%45%5%47%7%39%
2470
21st to endNight
10%8%28%445%47%7%41%
2531
December1st to 10thNight
12%11%48%5%45%36%6%33%
2660
11th to 20thNight
12%10%5%11%6%6%6%5%6%7%26%
3276
21st to endNight
11%12%5%10%5%5%6%46%9%28%
4862

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
54%14%16%14%2
2539
11th to 20thDay
58%14%13%14%1
2540
21st to endDay
58%14%15%10%2
2794
February1st to 10thDay
43%12%21%18%5%1
1678
11th to 20thDay
42%10%18%21%9%
1860
21st to endDay
41%9%18%21%10%1
1570
March1st to 10thDay
43%11%13%21%11%1
3138
11th to 20thDay
26%7%11%39%16%1
3321
21st to endDay
42%13%16%20%7%2
4062
April1st to 10thDay
40%8%16%22%13%2
2280
11th to 20thDay
35%6%12%24%18%4
2266
21st to endDay
31%7%12%29%18%3
2470
May1st to 10thDay
29%5%11%26%24%5%
4110
11th to 20thDay
18%47%24%33%13%
4271
21st to endDay
24%7%13%31%22%3
4814
June1st to 10thDay
33%8%12%26%19%2
2660
11th to 20thDay
22%6%9%25%28%11%
2660
21st to endDay
13%47%19%35%21%
2660
July1st to 10thDay
8%249%19%58%
4351
11th to 20thDay
10%136%20%60%
4345
21st to endDay
11%248%31%46%
4639
August1st to 10thDay
18%35%10%27%38%
4266
11th to 20thDay
8%2314%36%37%
4014
21st to endDay
12%2416%36%29%
4179
September1st to 10thDay
11%35%16%32%32%
2280
11th to 20thDay
18%5%9%24%28%17%
2129
21st to endDay
20%37%25%33%11%
2090
October1st to 10thDay
20%37%17%42%11%
3490
11th to 20thDay
26%412%31%23%4
3026
21st to endDay
29%6%13%31%20%1
3101
November1st to 10thDay
39%7%16%25%13%
1710
11th to 20thDay
40%11%19%24%6%1
1710
21st to endDay
40%9%23%22%6%
1646
December1st to 10thDay
45%11%23%14%6%
1520
11th to 20thDay
56%11%17%13%3
1928
21st to endDay
50%11%20%16%4
2794
January1st to 10thNight
55%13%20%10%2
4406
11th to 20thNight
59%13%13%13%3
4420
21st to endNight
54%13%16%14%3
4862
February1st to 10thNight
44%10%20%22%4
2496
11th to 20thNight
40%10%18%21%10%1
2219
21st to endNight
42%9%16%21%11%1
1884
March1st to 10thNight
37%9%15%23%15%1
3736
11th to 20thNight
31%6%8%33%21%1
3659
21st to endNight
41%11%15%23%9%1
3586
April1st to 10thNight
38%7%11%25%17%2
1900
11th to 20thNight
34%7%10%27%18%3
1864
21st to endNight
29%5%14%27%22%3
1710
May1st to 10thNight
27%7%12%27%23%4
2860
11th to 20thNight
18%5%8%22%38%9%
2626
21st to endNight
29%6%13%27%23%3
2762
June1st to 10thNight
31%9%13%26%19%2
1520
11th to 20thNight
26%5%7%22%30%10%
1520
21st to endNight
14%5%9%19%33%21%
1520
July1st to 10thNight
8%239%19%59%
2500
11th to 20thNight
8%237%19%61%
2492
21st to endNight
15%246%30%43%
2674
August1st to 10thNight
20%35%10%24%38%
2643
11th to 20thNight
9%2410%27%47%
2891
21st to endNight
13%2313%35%34%
3498
September1st to 10thNight
12%35%12%30%38%
1900
11th to 20thNight
19%47%21%24%25%
2050
21st to endNight
19%45%21%32%20%
2090
October1st to 10thNight
18%36%17%32%24%
3490
11th to 20thNight
21%49%30%30%6%
3903
21st to endNight
31%5%12%28%23%2
4457
November1st to 10thNight
38%7%12%24%18%1
2469
11th to 20thNight
42%7%16%27%9%
2470
21st to endNight
37%9%17%26%10%
2531
December1st to 10thNight
47%9%19%17%7%1
2660
11th to 20thNight
52%11%17%17%3
3276
21st to endNight
47%11%21%14%6%
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
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
19%9%23%27%16%6%
180
11th to 20thDay
15%11%21%30%19%3
180
21st to endDay
12%7%21%33%22%4
198
February1st to 10thDay
12%14%31%25%14%4
303
11th to 20thDay
13%12%29%29%14%4
455
21st to endDay
13%15%27%27%15%2
382
March1st to 10thDay
12%14%33%29%11%1
460
11th to 20thDay
10%13%28%28%16%4
460
21st to endDay
11%16%31%26%15%2
506
April1st to 10thDay
14%16%25%21%18%7%
460
11th to 20thDay
9%15%31%25%15%6%
452
21st to endDay
8%12%33%25%17%4
460
May1st to 10thDay
416%28%30%16%6%
463
11th to 20thDay
13%8%22%28%20%8%
488
21st to endDay
8%5%17%31%25%13%
529
June1st to 10thDay
6%7%23%33%19%12%
490
11th to 20thDay
7%10%28%32%18%5%
490
21st to endDay
4422%37%23%10%
490
July1st to 10thDay
1121%41%28%8%
486
11th to 20thDay
218%45%28%6%
484
21st to endDay
2214%42%32%8%
531
August1st to 10thDay
4218%37%31%8%
487
11th to 20thDay
1217%32%36%13%
477
21st to endDay
4317%35%26%16%
539
September1st to 10thDay
4212%31%34%17%
490
11th to 20thDay
5%5%14%32%28%16%
490
21st to endDay
5%417%32%30%12%
490
October1st to 10thDay
7%7%18%24%25%19%
490
11th to 20thDay
8%5%20%26%28%12%
409
21st to endDay
10%9%23%28%23%8%
330
November1st to 10thDay
12%8%24%32%20%4
282
11th to 20thDay
9%6%20%34%23%7%
270
21st to endDay
13%319%34%26%5%
239
December1st to 10thDay
19%7%20%27%16%11%
180
11th to 20thDay
19%6%29%27%14%4
180
21st to endDay
14%12%22%32%17%4
198
January1st to 10thNight
17%8%23%29%19%3
760
11th to 20thNight
14%8%23%29%22%3
760
21st to endNight
16%221%34%22%4
836
February1st to 10thNight
15%8%26%34%15%2
760
11th to 20thNight
13%5%26%37%18%1
744
21st to endNight
12%9%29%34%15%1
628
March1st to 10thNight
12%8%32%33%14%2
760
11th to 20thNight
11%8%24%37%18%2
760
21st to endNight
12%11%27%37%12%1
836
April1st to 10thNight
12%8%26%34%18%2
760
11th to 20thNight
10%10%26%35%16%2
736
21st to endNight
7%9%27%38%17%2
570
May1st to 10thNight
5%9%29%36%19%2
570
11th to 20thNight
8%7%24%30%25%4
445
21st to endNight
5%7%24%37%24%4
411
June1st to 10thNight
8%6%23%37%23%3
380
11th to 20thNight
7%7%29%34%20%2
380
21st to endNight
2325%41%27%2
380
July1st to 10thNight
1120%48%28%1
370
11th to 20thNight
221%56%21%
368
21st to endNight
1115%52%31%1
416
August1st to 10thNight
3213%52%28%2
448
11th to 20thNight
1214%48%33%2
591
21st to endNight
3314%45%30%6%
836
September1st to 10thNight
3213%41%37%4
760
11th to 20thNight
6%213%38%36%6%
760
21st to endNight
7%414%37%29%9%
760
October1st to 10thNight
8%418%38%28%5%
760
11th to 20thNight
8%418%36%28%6%
760
21st to endNight
8%5%21%39%23%4
836
November1st to 10thNight
14%5%21%34%23%3
760
11th to 20thNight
16%7%21%34%19%3
760
21st to endNight
13%6%22%34%22%4
760
December1st to 10thNight
18%6%20%37%17%3
760
11th to 20thNight
18%6%20%38%15%2
760
21st to endNight
22%7%26%33%10%1
836
Page generated at 2024-11-03 00:11:23. Version ac07

Copyright © 2024 Attilla Danko.


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