Mobile Regional Airport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mobile Regional Airport clear sky chart from 2005-11-06 to 2024-01-15.

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%
23273
23%
74524
19%
23219
62%
23219
30%
44398

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
35%
760
25%
2285
11%
757
48%
757
28%
1428
January11th to 20thNight
42%
740
28%
2220
18%
740
52%
740
30%
1351
January21st to endNight
33%
792
28%
2376
13%
792
46%
792
25%
1520
February1st to 10thNight
37%
720
26%
2160
14%
720
47%
720
27%
1355
February11th to 20thNight
34%
703
22%
2099
11%
700
44%
700
26%
1354
February21st to endNight
29%
592
21%
1776
11%
592
36%
592
21%
1210
March1st to 10thNight
39%
720
24%
2160
15%
720
46%
720
30%
1325
March11th to 20thNight
42%
680
20%
2102
13%
680
48%
680
26%
1325
March21st to endNight
49%
594
28%
1980
21%
594
57%
594
32%
1120
April1st to 10thNight
45%
540
24%
1800
20%
540
53%
540
27%
1077
April11th to 20thNight
47%
533
24%
1775
21%
533
55%
533
30%
1040
April21st to endNight
64%
540
32%
1800
29%
540
74%
540
44%
879
May1st to 10thNight
63%
540
25%
1800
25%
540
68%
540
38%
955
May11th to 20thNight
70%
531
19%
1700
19%
531
72%
531
34%
983
May21st to endNight
75%
582
23%
1744
22%
582
76%
582
35%
1017
June1st to 10thNight
71%
540
15%
1620
16%
540
72%
540
30%
1012
June11th to 20thNight
83%
540
18%
1620
18%
540
83%
540
38%
917
June21st to endNight
73%
540
13%
1620
14%
540
74%
540
30%
1029
July1st to 10thNight
79%
525
10%
1611
11%
525
79%
525
27%
1037
July11th to 20thNight
81%
522
10%
1740
12%
522
81%
522
26%
1098
July21st to endNight
83%
591
13%
1858
16%
558
83%
558
32%
1089
August1st to 10thNight
87%
537
12%
1778
15%
534
87%
534
35%
999
August11th to 20thNight
77%
534
12%
1776
15%
534
77%
534
25%
1119
August21st to endNight
71%
594
15%
1980
19%
594
71%
594
25%
1274
September1st to 10thNight
75%
540
19%
1800
21%
540
75%
540
28%
1115
September11th to 20thNight
66%
684
21%
1944
18%
684
67%
684
30%
1242
September21st to endNight
69%
720
29%
1980
24%
720
71%
720
36%
1187
October1st to 10thNight
67%
720
30%
1980
23%
720
70%
720
44%
1100
October11th to 20thNight
64%
720
38%
2027
29%
720
71%
720
47%
1089
October21st to endNight
56%
792
33%
2376
27%
792
63%
792
37%
1330
November1st to 10thNight
61%
740
30%
2352
26%
740
68%
740
39%
1246
November11th to 20thNight
51%
760
32%
2470
28%
760
61%
760
35%
1351
November21st to endNight
49%
760
28%
2470
22%
760
59%
760
31%
1415
December1st to 10thNight
44%
760
27%
2470
20%
760
54%
760
29%
1464
December11th to 20thNight
39%
759
24%
2904
16%
758
49%
758
20%
1779
December21st to endNight
33%
828
15%
4371
13%
817
42%
817
14%
2567

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
11%5%36%6%45%5%6%8%41%
74745
Night
11%5%25%5%35%5%6%8%47%
75051
TransparencyDay
39%6%12%19%17%7%
74488
Night
35%6%13%19%19%8%
74827
SeeingDay
13%6%17%24%24%16%
13282
Night
12%5%18%31%27%8%
23284

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%6%35%5%3446%6%45%
1876
11th to 20thDay
15%5%25%5%34446%47%
1846
21st to endDay
19%6%35%434345%44%
1980
February1st to 10thDay
18%7%25%5%2435%6%42%
1800
11th to 20thDay
17%5%35%4345%48%42%
1748
21st to endDay
17%5%36%5%45%46%7%37%
1480
March1st to 10thDay
13%5%25%5%345%6%7%45%
1800
11th to 20thDay
15%6%25%5%345%5%8%41%
1872
21st to endDay
12%5%25%5%345%5%7%47%
2376
April1st to 10thDay
12%435%5%35%6%7%7%44%
2160
11th to 20thDay
13%5%25%5%35%46%9%42%
2134
21st to endDay
8%6%23425%45%8%53%
2160
May1st to 10thDay
10%42443447%9%49%
2160
11th to 20thDay
7%5%36%6%46%6%7%9%41%
2190
21st to endDay
8%426%6%47%5%7%8%42%
2531
June1st to 10thDay
9%6%27%7%5%7%7%9%11%31%
2340
11th to 20thDay
5%325%7%48%8%8%13%35%
2340
21st to endDay
8%6%28%8%5%7%8%9%11%27%
2340
July1st to 10thDay
9%6%37%9%6%9%8%8%10%24%
2296
11th to 20thDay
8%6%38%9%6%7%8%9%10%25%
2160
21st to endDay
7%6%37%7%5%9%7%9%11%28%
2350
August1st to 10thDay
6%425%8%5%8%9%11%12%29%
2148
11th to 20thDay
11%6%37%8%5%7%8%8%11%28%
2125
21st to endDay
11%7%36%8%5%7%7%6%10%31%
2376
September1st to 10thDay
8%5%36%7%47%8%9%9%34%
2160
11th to 20thDay
10%7%46%6%36%6%5%8%38%
1998
21st to endDay
8%436%5%35%6%46%50%
1980
October1st to 10thDay
7%425%43345%7%56%
1980
11th to 20thDay
8%324435%5%6%6%55%
1928
21st to endDay
11%42443445%7%53%
1980
November1st to 10thDay
8%424333447%57%
1724
11th to 20thDay
11%424323346%56%
1710
21st to endDay
11%435%6%34447%48%
1710
December1st to 10thDay
13%7%26%6%3445%6%45%
1710
11th to 20thDay
14%7%36%5%34446%43%
2153
21st to endDay
17%8%35%42345%7%40%
3124
January1st to 10thNight
17%5%245%35%445%46%
2285
11th to 20thNight
14%6%35%42345%6%49%
2220
21st to endNight
19%6%3443444444%
2376
February1st to 10thNight
15%7%245%25%446%45%
2160
11th to 20thNight
18%6%34424445%44%
2098
21st to endNight
17%9%35%5%345%5%7%36%
1776
March1st to 10thNight
14%6%25%43445%7%47%
2160
11th to 20thNight
13%7%35%5%3446%8%41%
2102
21st to endNight
12%5%24425%45%7%50%
1980
April1st to 10thNight
12%6%36%4345%6%7%45%
1800
11th to 20thNight
13%5%25%435%6%5%7%47%
1775
21st to endNight
6%413423348%62%
1800
May1st to 10thNight
11%42332335%8%56%
1800
11th to 20thNight
5%425%6%36%5%7%11%46%
1700
21st to endNight
7%424435%5%7%12%47%
1744
June1st to 10thNight
6%5%26%6%37%6%8%13%38%
1620
11th to 20thNight
3324446%6%8%11%48%
1620
21st to endNight
5%5%26%6%5%6%6%7%12%39%
1620
July1st to 10thNight
5%4345%47%8%8%11%41%
1658
11th to 20thNight
33247%47%8%9%13%39%
1800
21st to endNight
4325%5%35%8%9%14%42%
1968
August1st to 10thNight
2223436%7%10%13%47%
1790
11th to 20thNight
5%435%6%35%8%10%14%37%
1776
21st to endNight
7%5%36%7%46%5%7%10%40%
1980
September1st to 10thNight
7%436%6%45%7%8%12%39%
1800
11th to 20thNight
8%6%36%5%45%6%6%9%44%
1944
21st to endNight
8%425%5%345%6%8%50%
1980
October1st to 10thNight
7%42442345%8%57%
1980
11th to 20thNight
8%32242345%7%61%
2027
21st to endNight
12%424423446%55%
2376
November1st to 10thNight
8%414434346%58%
2352
11th to 20thNight
11%5%2442445%6%54%
2470
21st to endNight
11%5%25%43446%7%49%
2470
December1st to 10thNight
13%6%25%5%335%5%7%46%
2470
11th to 20thNight
16%7%345%345%46%44%
3042
21st to endNight
16%7%36%5%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
40%46%17%24%10%
1877
11th to 20thDay
39%37%17%23%10%
1846
21st to endDay
43%4416%22%11%
1980
February1st to 10thDay
44%39%14%19%11%
1800
11th to 20thDay
41%47%17%20%11%
1758
21st to endDay
45%5%8%16%16%10%
1480
March1st to 10thDay
37%5%8%20%20%10%
1800
11th to 20thDay
41%5%11%15%20%8%
1872
21st to endDay
37%5%10%20%19%9%
2376
April1st to 10thDay
36%6%11%19%20%9%
2160
11th to 20thDay
38%5%7%21%20%8%
2134
21st to endDay
29%49%25%23%9%
2160
May1st to 10thDay
30%5%11%24%23%8%
2160
11th to 20thDay
36%8%13%22%18%2
2194
21st to endDay
36%7%13%26%15%3
2531
June1st to 10thDay
41%9%15%24%9%1
2340
11th to 20thDay
35%10%17%25%10%3
2340
21st to endDay
44%10%20%17%8%1
2340
July1st to 10thDay
49%13%20%14%4
2233
11th to 20thDay
46%12%24%13%41
2097
21st to endDay
43%11%21%21%4
2219
August1st to 10thDay
38%11%25%20%6%
2136
11th to 20thDay
46%10%22%13%7%1
2125
21st to endDay
47%8%18%16%8%2
2376
September1st to 10thDay
39%10%17%17%13%4
2160
11th to 20thDay
41%8%14%16%15%7%
1998
21st to endDay
33%6%10%22%20%8%
1980
October1st to 10thDay
28%5%11%20%22%14%
1980
11th to 20thDay
28%5%7%21%25%14%
1928
21st to endDay
32%35%16%26%17%
1980
November1st to 10thDay
27%48%21%26%14%
1724
11th to 20thDay
31%26%18%29%13%
1710
21st to endDay
36%47%19%21%12%
1710
December1st to 10thDay
40%49%18%21%8%
1710
11th to 20thDay
43%36%16%21%10%
2150
21st to endDay
44%36%21%19%6%
3124
January1st to 10thNight
40%48%15%25%9%
2285
11th to 20thNight
37%47%19%23%10%
2220
21st to endNight
43%35%13%27%10%
2376
February1st to 10thNight
41%36%17%21%11%
2160
11th to 20thNight
43%45%15%21%12%
2099
21st to endNight
46%6%8%16%11%13%
1776
March1st to 10thNight
37%5%9%16%22%11%
2160
11th to 20thNight
40%5%12%17%18%8%
2102
21st to endNight
33%412%20%21%9%
1980
April1st to 10thNight
38%413%14%21%10%
1800
11th to 20thNight
36%5%10%21%21%8%
1775
21st to endNight
23%411%27%27%8%
1800
May1st to 10thNight
28%411%24%26%7%
1800
11th to 20thNight
31%7%18%21%20%3
1701
21st to endNight
29%9%17%24%19%2
1745
June1st to 10thNight
34%9%22%25%9%1
1620
11th to 20thNight
27%8%24%28%12%1
1620
21st to endNight
35%9%25%20%10%1
1620
July1st to 10thNight
33%13%30%17%7%
1611
11th to 20thNight
30%16%33%16%31
1740
21st to endNight
28%12%32%23%4
1858
August1st to 10thNight
24%12%34%25%41
1778
11th to 20thNight
32%15%30%17%7%
1776
21st to endNight
38%10%24%18%7%3
1980
September1st to 10thNight
34%11%21%17%12%5%
1800
11th to 20thNight
37%8%16%18%14%8%
1944
21st to endNight
31%6%13%23%17%9%
1980
October1st to 10thNight
26%412%20%22%15%
1980
11th to 20thNight
24%49%23%26%14%
2027
21st to endNight
31%45%15%28%18%
2376
November1st to 10thNight
29%37%18%27%16%
2352
11th to 20thNight
31%35%19%27%14%
2470
21st to endNight
34%47%21%21%12%
2470
December1st to 10thNight
38%410%20%22%7%
2470
11th to 20thNight
42%46%13%23%12%
3044
21st to endNight
45%37%20%20%6%
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
20%12%37%21%8%1
270
11th to 20thDay
17%12%30%26%12%2
254
21st to endDay
21%12%41%19%6%1
264
February1st to 10thDay
25%17%32%19%6%1
240
11th to 20thDay
26%15%30%20%8%
240
21st to endDay
14%18%43%20%5%1
198
March1st to 10thDay
17%14%38%26%5%
240
11th to 20thDay
18%14%36%24%9%
258
21st to endDay
16%11%29%31%13%1
462
April1st to 10thDay
17%10%29%25%16%2
420
11th to 20thDay
16%12%27%23%17%4
412
21st to endDay
10%7%25%34%19%4
420
May1st to 10thDay
10%5%23%30%25%7%
423
11th to 20thDay
9%215%31%29%13%
447
21st to endDay
8%28%35%26%21%
485
June1st to 10thDay
12%27%27%28%23%
450
11th to 20thDay
8%37%26%32%23%
450
21st to endDay
9%37%20%32%29%
450
July1st to 10thDay
9%3316%31%38%
445
11th to 20thDay
8%3311%35%39%
444
21st to endDay
7%1320%39%31%
488
August1st to 10thDay
6%2212%39%40%
446
11th to 20thDay
9%1312%35%40%
439
21st to endDay
12%25%16%34%32%
495
September1st to 10thDay
7%1319%42%28%
450
11th to 20thDay
11%37%23%35%21%
450
21st to endDay
10%18%27%36%18%
450
October1st to 10thDay
10%116%35%27%10%
450
11th to 20thDay
7%414%29%35%11%
398
21st to endDay
16%7%20%31%19%7%
297
November1st to 10thDay
13%423%37%20%3
270
11th to 20thDay
16%11%27%26%16%5%
270
21st to endDay
14%10%31%29%12%4
270
December1st to 10thDay
15%9%34%26%13%3
270
11th to 20thDay
21%12%33%25%8%
270
21st to endDay
24%11%28%24%12%2
297
January1st to 10thNight
20%7%33%33%7%
760
11th to 20thNight
16%9%27%37%11%
740
21st to endNight
21%9%31%33%7%
792
February1st to 10thNight
18%10%29%35%8%
720
11th to 20thNight
21%10%32%28%9%
703
21st to endNight
21%9%33%31%5%
592
March1st to 10thNight
16%9%32%34%9%
720
11th to 20thNight
15%8%29%35%12%1
680
21st to endNight
12%6%29%37%16%1
594
April1st to 10thNight
14%7%25%37%15%2
540
11th to 20thNight
16%5%27%30%21%1
533
21st to endNight
7%421%44%24%1
540
May1st to 10thNight
12%316%40%27%2
540
11th to 20thNight
6%110%41%37%5%
531
21st to endNight
9%26%30%43%10%
584
June1st to 10thNight
8%1433%44%9%
540
11th to 20thNight
41426%49%15%
540
21st to endNight
8%1322%49%17%
540
July1st to 10thNight
5%1114%54%25%
525
11th to 20thNight
31111%49%36%
522
21st to endNight
32118%51%25%
591
August1st to 10thNight
31110%51%35%
537
11th to 20thNight
7%1111%50%30%
534
21st to endNight
10%2315%51%20%
594
September1st to 10thNight
7%2220%47%21%
540
11th to 20thNight
10%36%23%46%12%
684
21st to endNight
9%28%29%43%9%
720
October1st to 10thNight
10%113%37%33%6%
720
11th to 20thNight
10%217%33%31%7%
720
21st to endNight
13%420%36%25%3
792
November1st to 10thNight
10%417%42%24%3
740
11th to 20thNight
13%5%23%39%18%2
760
21st to endNight
13%5%26%36%18%2
760
December1st to 10thNight
15%7%28%33%16%2
760
11th to 20thNight
21%6%26%34%12%1
760
21st to endNight
23%6%31%31%9%
836
Page generated at 2024-01-12 15:17:49. Version ac07

Copyright 2024 Attilla Danko


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