Mobile
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mobile clear sky chart from 2005-11-06 to 2024-03-06.

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
53%
23497
15%
79461
11%
23391
58%
23391
15%
57108

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
31%
757
20%
3733
6%
737
41%
737
9%
2433
January11th to 20thNight
37%
755
26%
3619
10%
740
44%
740
10%
2233
January21st to endNight
28%
832
12%
4085
7%
814
37%
814
8%
2834
February1st to 10thNight
31%
760
18%
2280
9%
760
39%
760
14%
1713
February11th to 20thNight
30%
743
13%
2219
6%
740
36%
740
12%
1719
February21st to endNight
25%
628
13%
1884
6%
628
31%
628
13%
1454
March1st to 10thNight
36%
743
17%
2227
10%
743
41%
743
17%
1634
March11th to 20thNight
38%
702
15%
2111
8%
702
44%
702
15%
1569
March21st to endNight
43%
594
18%
1980
12%
594
50%
594
15%
1412
April1st to 10thNight
43%
540
16%
1800
13%
540
49%
540
15%
1314
April11th to 20thNight
45%
533
18%
1775
14%
533
51%
533
16%
1268
April21st to endNight
64%
540
23%
1800
21%
540
70%
540
23%
1162
May1st to 10thNight
60%
540
16%
1800
13%
540
65%
540
17%
1274
May11th to 20thNight
66%
531
12%
1678
10%
531
68%
531
17%
1230
May21st to endNight
73%
583
16%
1744
16%
582
74%
582
21%
1229
June1st to 10thNight
71%
540
11%
1620
11%
540
71%
540
17%
1200
June11th to 20thNight
81%
540
15%
1620
15%
540
82%
540
20%
1160
June21st to endNight
73%
540
11%
1620
10%
540
73%
540
16%
1210
July1st to 10thNight
76%
525
6%
1583
6%
525
76%
525
13%
1273
July11th to 20thNight
81%
522
6%
1740
8%
522
81%
522
14%
1327
July21st to endNight
82%
591
6%
1858
8%
558
82%
558
14%
1423
August1st to 10thNight
86%
537
7%
1778
9%
534
86%
534
19%
1251
August11th to 20thNight
77%
534
8%
1776
9%
534
77%
534
14%
1350
August21st to endNight
70%
594
10%
1980
12%
594
71%
594
11%
1567
September1st to 10thNight
72%
540
12%
1800
13%
540
73%
540
14%
1359
September11th to 20thNight
63%
693
13%
1953
10%
693
65%
693
15%
1523
September21st to endNight
68%
720
17%
1980
13%
720
70%
720
19%
1456
October1st to 10thNight
64%
720
19%
1980
13%
720
68%
720
21%
1419
October11th to 20thNight
63%
720
24%
2006
18%
720
68%
720
22%
1414
October21st to endNight
53%
792
21%
2376
17%
792
58%
792
20%
1670
November1st to 10thNight
58%
740
21%
2370
19%
740
63%
740
21%
1602
November11th to 20thNight
50%
760
21%
2470
16%
760
58%
760
16%
1771
November21st to endNight
47%
760
15%
2470
11%
760
54%
760
14%
1838
December1st to 10thNight
41%
760
17%
2470
13%
760
48%
760
14%
1827
December11th to 20thNight
36%
759
17%
2902
10%
758
42%
758
11%
2109
December21st to endNight
31%
829
12%
4374
9%
817
38%
817
9%
2881

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
10%5%25%5%35%5%6%9%43%
79120
Night
11%5%25%5%345%6%8%46%
80381
TransparencyDay
25%37%8%13%12%5%
78861
Night
24%36%8%12%14%6%
80159
SeeingDay
11%8%20%25%23%12%
13465
Night
12%7%21%29%24%7%
23518

By Month

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 10thDay
14%5%25%43445%7%45%
3074
11th to 20thDay
11%42342345%7%55%
3160
21st to endDay
24%7%35%433346%38%
3476
February1st to 10thDay
16%7%35%5%34446%43%
1900
11th to 20thDay
18%5%24425%45%8%43%
1848
21st to endDay
15%6%37%6%345%5%7%39%
1570
March1st to 10thDay
11%6%25%5%35%45%7%47%
1850
11th to 20thDay
13%6%35%5%345%6%8%43%
1860
21st to endDay
11%5%25%5%345%5%7%49%
2376
April1st to 10thDay
10%6%25%435%46%8%47%
2160
11th to 20thDay
12%5%3443446%9%44%
2134
21st to endDay
7%42442445%7%56%
2160
May1st to 10thDay
9%4233245%6%8%54%
2160
11th to 20thDay
6%425%6%46%7%7%9%44%
2211
21st to endDay
7%425%5%45%6%7%11%44%
2531
June1st to 10thDay
7%5%36%7%38%7%10%11%33%
2340
11th to 20thDay
5%325%6%47%9%9%11%38%
2340
21st to endDay
8%5%26%7%6%7%8%9%13%29%
2340
July1st to 10thDay
7%6%37%9%5%8%8%9%12%26%
2325
11th to 20thDay
7%5%26%9%6%9%7%9%11%27%
2160
21st to endDay
6%5%46%7%5%8%8%9%12%30%
2350
August1st to 10thDay
5%425%7%5%8%8%11%14%31%
2148
11th to 20thDay
10%5%27%8%48%8%8%10%30%
2125
21st to endDay
10%6%36%7%6%7%7%7%9%32%
2376
September1st to 10thDay
9%425%6%37%7%9%10%38%
2160
11th to 20thDay
9%6%36%7%36%5%6%9%40%
1986
21st to endDay
7%425%5%35%5%5%7%52%
1980
October1st to 10thDay
6%42442445%8%56%
1980
11th to 20thDay
9%32343345%9%56%
1949
21st to endDay
10%4145%345%6%6%52%
1980
November1st to 10thDay
8%41342345%7%58%
1704
11th to 20thDay
10%424424446%57%
1710
21st to endDay
11%4345%3445%8%49%
1710
December1st to 10thDay
11%8%36%5%3445%6%45%
1710
11th to 20thDay
14%8%36%5%34445%44%
2153
21st to endDay
16%9%46%433447%40%
3124
January1st to 10thNight
16%6%245%35%5%5%5%45%
3853
11th to 20thNight
14%7%24423446%51%
3800
21st to endNight
23%8%3432335%441%
4180
February1st to 10thNight
15%7%35%5%34347%45%
2280
11th to 20thNight
18%6%35%43345%6%44%
2218
21st to endNight
16%8%36%5%35%5%5%6%39%
1884
March1st to 10thNight
14%6%25%5%3445%6%47%
2227
11th to 20thNight
12%7%36%5%25%5%6%9%41%
2111
21st to endNight
10%5%24435%45%7%50%
1980
April1st to 10thNight
12%6%35%435%45%8%46%
1800
11th to 20thNight
12%5%244345%5%7%48%
1775
21st to endNight
6%32342335%7%63%
1800
May1st to 10thNight
10%424313448%56%
1800
11th to 20thNight
4425%6%35%6%8%10%47%
1678
21st to endNight
6%4235%35%5%7%13%47%
1744
June1st to 10thNight
7%425%5%36%6%9%13%40%
1620
11th to 20thNight
4224436%6%9%12%47%
1620
21st to endNight
6%5%25%5%47%6%9%13%38%
1620
July1st to 10thNight
4426%6%37%7%9%12%40%
1628
11th to 20thNight
3325%6%5%6%8%10%13%39%
1800
21st to endNight
3225%5%46%8%9%15%41%
1968
August1st to 10thNight
22245%36%7%9%14%46%
1790
11th to 20thNight
5%5%35%6%47%7%9%14%36%
1776
21st to endNight
8%5%36%6%46%7%7%10%38%
1980
September1st to 10thNight
6%425%6%46%7%8%13%38%
1800
11th to 20thNight
9%5%27%6%345%6%9%44%
1953
21st to endNight
7%5%245%345%7%8%49%
1980
October1st to 10thNight
6%3245%3345%8%55%
1980
11th to 20thNight
8%31332445%7%60%
2006
21st to endNight
12%424433346%56%
2376
November1st to 10thNight
8%424424446%57%
2370
11th to 20thNight
10%5%25%424347%54%
2470
21st to endNight
11%5%25%5%3446%7%48%
2470
December1st to 10thNight
13%5%35%5%345%5%6%46%
2470
11th to 20thNight
15%7%35%5%34446%44%
3042
21st to endNight
15%7%36%6%3445%5%41%
4532

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
28%26%413%18%10%
3075
11th to 20thDay
21%25%5%16%25%8%
3160
21st to endDay
41%24%312%14%7%
3476
February1st to 10thDay
29%34%6%11%13%7%
1900
11th to 20thDay
27%37%49%14%9%
1858
21st to endDay
29%36%5%13%12%6%
1570
March1st to 10thDay
25%35%5%15%15%6%
1850
11th to 20thDay
22%38%9%12%13%6%
1860
21st to endDay
22%38%8%14%13%4
2376
April1st to 10thDay
22%38%9%13%11%7%
2160
11th to 20thDay
22%37%7%13%15%6%
2134
21st to endDay
17%37%7%17%17%5%
2160
May1st to 10thDay
20%38%10%17%13%2
2160
11th to 20thDay
22%41%10%14%11%2
2215
21st to endDay
19%39%10%19%11%1
2531
June1st to 10thDay
24%39%13%17%6%1
2340
11th to 20thDay
18%40%14%18%8%2
2340
21st to endDay
27%40%14%11%7%1
2340
July1st to 10thDay
34%44%13%7%2
2260
11th to 20thDay
30%45%13%7%31
2097
21st to endDay
28%43%16%11%2
2219
August1st to 10thDay
23%42%16%13%5%
2136
11th to 20thDay
30%40%15%9%5%
2125
21st to endDay
32%41%10%10%5%2
2376
September1st to 10thDay
24%41%11%13%8%2
2160
11th to 20thDay
29%40%9%8%9%6%
1986
21st to endDay
21%38%7%12%14%8%
1980
October1st to 10thDay
19%36%7%10%16%12%
1980
11th to 20thDay
19%36%5%13%17%10%
1949
21st to endDay
19%38%411%19%10%
1980
November1st to 10thDay
11%40%5%13%19%12%
1704
11th to 20thDay
17%40%5%11%18%10%
1710
21st to endDay
23%39%5%12%13%8%
1710
December1st to 10thDay
24%40%6%12%13%5%
1710
11th to 20thDay
32%32%410%16%6%
2150
21st to endDay
29%26%417%18%5%
3124
January1st to 10thNight
30%26%48%22%9%
3853
11th to 20thNight
27%25%412%25%8%
3800
21st to endNight
39%22%412%16%7%
4180
February1st to 10thNight
28%34%312%15%8%
2280
11th to 20thNight
30%36%37%13%11%
2219
21st to endNight
30%35%6%12%9%9%
1884
March1st to 10thNight
25%35%5%11%16%8%
2227
11th to 20thNight
23%39%9%12%12%6%
2111
21st to endNight
22%37%9%12%14%6%
1980
April1st to 10thNight
24%37%9%9%13%7%
1800
11th to 20thNight
22%37%7%13%14%6%
1775
21st to endNight
13%36%8%19%19%5%
1800
May1st to 10thNight
21%37%9%16%13%3
1800
11th to 20thNight
20%40%14%12%13%1
1679
21st to endNight
17%38%12%18%13%1
1745
June1st to 10thNight
21%40%16%16%6%1
1620
11th to 20thNight
17%40%14%20%8%1
1620
21st to endNight
22%40%15%15%7%1
1620
July1st to 10thNight
26%44%17%8%4
1583
11th to 20thNight
19%46%21%11%21
1740
21st to endNight
22%44%21%12%2
1858
August1st to 10thNight
14%43%23%17%31
1778
11th to 20thNight
22%43%19%11%5%
1776
21st to endNight
28%42%13%11%42
1980
September1st to 10thNight
24%40%15%10%9%2
1800
11th to 20thNight
27%39%10%10%8%6%
1953
21st to endNight
20%39%9%13%12%7%
1980
October1st to 10thNight
19%37%5%10%16%13%
1980
11th to 20thNight
18%36%6%12%17%11%
2006
21st to endNight
19%36%310%20%12%
2376
November1st to 10thNight
14%39%311%20%13%
2370
11th to 20thNight
20%39%312%16%10%
2470
21st to endNight
23%40%5%11%13%8%
2470
December1st to 10thNight
22%40%5%12%15%5%
2470
11th to 20thNight
29%32%5%8%19%7%
3044
21st to endNight
31%26%416%18%5%
4532

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
17%20%39%18%6%
270
11th to 20thDay
14%20%30%24%10%2
270
21st to endDay
21%22%36%17%41
297
February1st to 10thDay
21%21%35%17%6%
270
11th to 20thDay
26%19%31%19%6%
270
21st to endDay
10%28%44%14%4
225
March1st to 10thDay
13%23%39%19%5%
255
11th to 20thDay
15%23%34%20%8%
269
21st to endDay
15%13%32%29%10%1
462
April1st to 10thDay
15%15%30%26%13%1
420
11th to 20thDay
15%15%32%20%17%2
412
21st to endDay
8%11%29%31%19%3
420
May1st to 10thDay
8%9%27%26%24%5%
423
11th to 20thDay
6%419%35%25%11%
447
21st to endDay
8%213%35%24%18%
485
June1st to 10thDay
10%213%30%30%16%
450
11th to 20thDay
7%211%28%34%18%
450
21st to endDay
9%211%21%35%21%
450
July1st to 10thDay
7%28%18%35%31%
445
11th to 20thDay
7%15%16%37%35%
444
21st to endDay
7%16%20%42%25%
488
August1st to 10thDay
5%15%17%35%37%
446
11th to 20thDay
9%25%14%37%33%
439
21st to endDay
11%27%19%35%26%
495
September1st to 10thDay
7%27%21%39%24%
450
11th to 20thDay
12%210%27%34%15%
450
21st to endDay
8%29%32%35%13%
450
October1st to 10thDay
8%416%38%26%8%
450
11th to 20thDay
9%6%16%29%32%8%
419
21st to endDay
15%11%19%32%18%5%
297
November1st to 10thDay
14%424%41%15%2
270
11th to 20thDay
14%16%27%28%13%3
270
21st to endDay
11%15%31%27%12%3
270
December1st to 10thDay
17%13%32%24%12%2
270
11th to 20thDay
21%17%33%20%7%1
270
21st to endDay
23%15%29%21%11%1
297
January1st to 10thNight
17%14%33%29%6%
760
11th to 20thNight
16%13%28%33%9%
760
21st to endNight
21%14%33%27%5%
836
February1st to 10thNight
17%13%36%28%6%
760
11th to 20thNight
22%12%33%24%8%
743
21st to endNight
18%16%37%25%4
628
March1st to 10thNight
15%13%32%32%8%
743
11th to 20thNight
14%11%33%30%11%1
702
21st to endNight
11%8%32%35%12%1
594
April1st to 10thNight
14%10%27%34%15%1
540
11th to 20thNight
15%6%31%28%19%1
533
21st to endNight
8%420%44%22%1
540
May1st to 10thNight
10%421%41%21%3
540
11th to 20thNight
5%216%39%34%4
531
21st to endNight
7%110%32%41%8%
584
June1st to 10thNight
8%27%33%41%9%
540
11th to 20thNight
5%2429%46%14%
540
21st to endNight
8%16%24%46%15%
540
July1st to 10thNight
41419%51%21%
525
11th to 20thNight
32213%47%33%
522
21st to endNight
3223%49%23%
591
August1st to 10thNight
3212%50%32%
537
11th to 20thNight
8%315%48%27%
534
21st to endNight
10%26%19%44%19%
594
September1st to 10thNight
6%17%21%45%19%
540
11th to 20thNight
10%211%25%40%12%
693
21st to endNight
10%210%29%42%8%
720
October1st to 10thNight
8%318%36%30%5%
720
11th to 20thNight
9%420%31%30%6%
720
21st to endNight
13%6%22%32%24%3
792
November1st to 10thNight
11%421%42%19%2
740
11th to 20thNight
12%9%25%38%14%2
760
21st to endNight
12%9%28%36%14%1
760
December1st to 10thNight
15%10%29%31%14%2
760
11th to 20thNight
19%9%29%32%10%1
760
21st to endNight
22%11%32%27%8%
836
Page generated at 2024-03-03 05:29:00. Version ac07

Copyright © 2024 Attilla Danko.


Mobile Clear Sky Chart |Charts Home