Marsing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Marsing clear sky chart from 2005-11-05 to 2017-09-16.

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
56%
14784
20%
46823
17%
14759
60%
14759
29%
28502

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
42%
716
8%
2506
7%
716
45%
716
13%
1872
January16th to endNight
48%
768
9%
2688
9%
768
50%
768
15%
1948
February1st to 15thNight
48%
697
9%
2249
8%
696
52%
696
19%
1567
February16th to endNight
42%
632
14%
1895
11%
632
47%
632
19%
1326
March1st to 15thNight
44%
720
11%
2160
9%
720
49%
720
20%
1496
March16th to endNight
42%
768
15%
2028
9%
768
46%
768
25%
1417
April1st to 15thNight
47%
719
20%
1799
9%
719
51%
719
29%
1206
April16th to endNight
53%
591
23%
1671
14%
591
57%
591
34%
999
May1st to 15thNight
54%
524
22%
1604
16%
524
60%
524
41%
843
May16th to endNight
61%
374
18%
1496
23%
374
66%
374
22%
862
June1st to 15thNight
56%
360
16%
1440
20%
360
63%
360
25%
798
June16th to endNight
65%
360
26%
1440
35%
360
74%
360
46%
590
July1st to 15thNight
78%
340
24%
1360
34%
340
85%
340
54%
504
July16th to endNight
75%
376
34%
1416
41%
354
85%
354
62%
498
August1st to 15thNight
79%
464
32%
1537
29%
462
84%
462
55%
661
August16th to endNight
80%
723
39%
1869
24%
723
83%
723
68%
893
September1st to 15thNight
79%
720
37%
1835
23%
720
83%
720
67%
890
September16th to endNight
71%
660
34%
1826
29%
660
73%
660
48%
970
October1st to 15thNight
64%
660
27%
1862
22%
660
69%
660
40%
1044
October16th to endNight
62%
704
24%
2280
24%
704
66%
704
32%
1314
November1st to 15thNight
52%
700
22%
2275
22%
700
56%
700
26%
1425
November16th to endNight
48%
720
14%
2379
10%
720
53%
720
20%
1587
December1st to 15thNight
48%
720
10%
2520
7%
720
52%
720
16%
1789
December16th to endNight
37%
768
11%
2688
9%
768
42%
768
14%
2003

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
7%5%2442445%7%51%
47958
Night
8%5%25%5%2445%7%47%
46996
TransparencyDay
31%7%12%20%17%10%
47629
Night
34%7%12%20%15%8%
46824
SeeingDay
8%8%26%31%18%6%
5405
Night
9%6%20%34%24%4
14797

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
13%9%48%7%47%5%7%6%24%
1432
16th to endDay
12%8%410%9%46%5%6%5%23%
1536
February1st to 15thDay
10%8%48%5%25%5%6%7%34%
1610
16th to endDay
8%7%46%6%36%5%5%8%35%
1579
March1st to 15thDay
10%8%36%6%36%5%6%9%33%
1800
16th to endDay
10%8%35%5%36%6%6%8%35%
2193
April1st to 15thDay
8%5%26%6%36%5%6%7%40%
2149
16th to endDay
7%6%2442435%7%50%
2289
May1st to 15thDay
4314425%447%57%
2345
16th to endDay
7%4245%3446%9%48%
2615
June1st to 15thDay
7%4344345%6%8%48%
2520
16th to endDay
2112223346%70%
2520
July1st to 15thDay
2111213345%72%
2520
16th to endDay
11121223478%
2657
August1st to 15thDay
21221334471%
2415
16th to endDay
11121223377%
2333
September1st to 15thDay
211112335%75%
2124
16th to endDay
5%312322247%63%
1823
October1st to 15thDay
7%41332445%7%56%
1766
16th to endDay
7%5%246%35%5%48%46%
1592
November1st to 15thDay
11%6%35%5%3446%8%39%
1584
16th to endDay
10%8%36%7%46%6%47%33%
1580
December1st to 15thDay
14%9%37%5%35%6%6%7%28%
1440
16th to endDay
16%10%5%9%8%3445%6%25%
1536
January1st to 15thNight
11%10%49%8%36%5%47%27%
2506
16th to endNight
12%9%310%7%35%45%5%32%
2688
February1st to 15thNight
12%9%35%5%35%5%5%7%35%
2238
16th to endNight
8%8%46%7%35%6%6%7%33%
1895
March1st to 15thNight
11%8%36%5%36%5%5%7%36%
2160
16th to endNight
9%7%36%426%5%6%8%39%
2028
April1st to 15thNight
8%5%35%5%345%5%8%42%
1799
16th to endNight
8%414425%45%5%52%
1671
May1st to 15thNight
4215%32445%7%58%
1604
16th to endNight
5%425%5%46%5%5%9%43%
1496
June1st to 15thNight
7%3145%445%5%8%49%
1440
16th to endNight
3113213347%67%
1440
July1st to 15thNight
1222236%7%70%
1440
16th to endNight
111121224476%
1512
August1st to 15thNight
221221325%6%69%
1545
16th to endNight
111113235%76%
1869
September1st to 15thNight
111212345%75%
1835
16th to endNight
7%313313335%64%
1826
October1st to 15thNight
7%31342445%5%57%
1862
16th to endNight
8%415%5%3446%7%49%
2280
November1st to 15thNight
13%5%2442445%7%44%
2275
16th to endNight
12%8%26%5%345%5%6%39%
2379
December1st to 15thNight
14%9%36%6%35%46%6%33%
2520
16th to endNight
18%11%46%6%2445%6%28%
2688

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
55%14%16%13%1
1432
16th to endDay
55%15%14%12%1
1536
February1st to 15thDay
44%14%20%16%4
1610
16th to endDay
43%8%19%21%6%
1579
March1st to 15thDay
47%10%14%21%5%1
1800
16th to endDay
45%8%14%21%8%
2193
April1st to 15thDay
42%7%13%23%11%1
2149
16th to endDay
32%6%12%27%16%3
2289
May1st to 15thDay
26%6%9%29%23%4
2345
16th to endDay
33%8%13%25%15%3
2619
June1st to 15thDay
33%7%10%22%19%5%
2520
16th to endDay
14%5%6%22%35%15%
2520
July1st to 15thDay
14%46%14%29%31%
2371
16th to endDay
10%247%28%47%
2490
August1st to 15thDay
15%37%14%28%31%
2398
16th to endDay
11%25%14%37%27%
2333
September1st to 15thDay
11%35%18%33%26%
2124
16th to endDay
22%48%26%27%10%
1823
October1st to 15thDay
25%6%15%26%21%4
1766
16th to endDay
33%7%14%28%14%
1592
November1st to 15thDay
39%8%19%23%8%
1584
16th to endDay
43%10%21%19%4
1580
December1st to 15thDay
48%12%22%13%3
1440
16th to endDay
58%9%14%14%3
1536
January1st to 15thNight
51%12%17%14%3
2506
16th to endNight
50%10%16%17%4
2688
February1st to 15thNight
44%11%20%18%5%
2249
16th to endNight
44%10%16%21%5%
1895
March1st to 15thNight
44%8%13%21%8%2
2160
16th to endNight
42%8%14%24%9%
2028
April1st to 15thNight
37%7%12%26%15%1
1799
16th to endNight
31%6%11%27%21%2
1671
May1st to 15thNight
22%6%12%23%31%4
1605
16th to endNight
35%8%9%26%14%5%
1496
June1st to 15thNight
31%9%10%24%19%5%
1440
16th to endNight
17%37%21%32%16%
1440
July1st to 15thNight
12%36%15%29%32%
1360
16th to endNight
11%138%28%46%
1416
August1st to 15thNight
14%47%14%26%32%
1537
16th to endNight
11%3415%30%35%
1869
September1st to 15thNight
11%35%15%31%32%
1835
16th to endNight
22%36%20%27%19%
1826
October1st to 15thNight
26%5%11%27%21%8%
1862
16th to endNight
32%6%13%25%20%1
2280
November1st to 15thNight
38%7%14%24%14%
2275
16th to endNight
42%9%17%22%7%
2379
December1st to 15thNight
49%9%19%18%4
2520
16th to endNight
53%9%15%17%3
2688

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
18%313%28%21%15%
60
16th to endDay
21%118%29%21%6%
64
February1st to 15thDay
12%9%23%25%23%5%
190
16th to endDay
10%17%28%30%10%2
238
March1st to 15thDay
14%17%31%23%11%1
270
16th to endDay
13%21%32%26%5%
288
April1st to 15thDay
10%19%29%20%13%7%
269
16th to endDay
11%15%35%22%13%2
270
May1st to 15thDay
5%14%30%32%12%3
288
16th to endDay
9%6%21%34%17%9%
330
June1st to 15thDay
8%8%33%30%13%5%
315
16th to endDay
26%32%33%17%7%
315
July1st to 15thDay
2127%39%23%5%
305
16th to endDay
329%42%19%5%
327
August1st to 15thDay
4229%35%22%6%
315
16th to endDay
3220%35%27%10%
332
September1st to 15thDay
2221%29%28%15%
315
16th to endDay
35%18%34%30%7%
258
October1st to 15thDay
8%8%20%30%24%7%
255
16th to endDay
15%5%25%34%11%7%
104
November1st to 15thDay
10%317%35%33%
90
16th to endDay
15%12%32%28%9%1
83
December1st to 15thDay
26%11%23%30%5%3
60
16th to endDay
29%7%15%20%20%6%
64
January1st to 15thNight
12%8%22%29%22%4
720
16th to endNight
13%5%16%30%26%6%
768
February1st to 15thNight
13%5%21%34%21%2
704
16th to endNight
9%9%28%31%19%1
632
March1st to 15thNight
11%12%24%31%16%3
720
16th to endNight
10%12%30%32%12%1
768
April1st to 15thNight
10%8%25%32%20%2
719
16th to endNight
9%12%21%35%17%4
591
May1st to 15thNight
5%8%26%32%22%3
525
16th to endNight
5%6%20%34%27%6%
375
June1st to 15thNight
9%5%23%33%23%4
360
16th to endNight
3422%35%30%3
360
July1st to 15thNight
215%47%32%3
340
16th to endNight
118%45%32%1
376
August1st to 15thNight
312%47%33%2
464
16th to endNight
1212%42%34%6%
723
September1st to 15thNight
2113%33%38%9%
720
16th to endNight
7%313%32%31%11%
660
October1st to 15thNight
9%416%38%24%6%
660
16th to endNight
8%5%15%36%27%6%
704
November1st to 15thNight
13%6%20%31%23%4
700
16th to endNight
14%8%20%30%20%4
720
December1st to 15thNight
15%6%17%39%18%2
720
16th to endNight
20%10%22%29%16%1
768
Page generated at 2017-09-17 10:05:43. Version ac04

Copyright 2017 A. Danko


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