Fort Walton Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Walton Beach clear sky chart from 2005-11-05 to 2017-08-12.

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
59%
15173
23%
46605
18%
15131
64%
15131
31%
27899

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
41%
718
23%
2250
13%
716
53%
716
27%
1366
January16th to endNight
37%
768
25%
2304
13%
768
47%
768
24%
1483
February1st to 15thNight
41%
703
27%
2108
14%
699
53%
699
30%
1284
February16th to endNight
39%
631
23%
1893
12%
631
48%
631
27%
1199
March1st to 15thNight
48%
720
25%
2142
14%
720
56%
720
31%
1290
March16th to endNight
58%
733
26%
2077
19%
733
62%
733
37%
1215
April1st to 15thNight
57%
539
26%
1797
21%
539
64%
539
31%
1006
April16th to endNight
65%
540
29%
1800
26%
540
71%
540
41%
925
May1st to 15thNight
67%
539
23%
1704
22%
539
70%
539
37%
936
May16th to endNight
73%
561
24%
1682
22%
561
74%
561
38%
952
June1st to 15thNight
75%
540
15%
1620
15%
540
76%
540
31%
982
June16th to endNight
78%
540
16%
1620
17%
540
78%
540
33%
983
July1st to 15thNight
81%
510
12%
1530
12%
510
81%
510
31%
952
July16th to endNight
79%
564
10%
1725
11%
531
80%
531
26%
1073
August1st to 15thNight
79%
527
11%
1750
14%
524
79%
524
27%
1084
August16th to endNight
71%
525
14%
1750
17%
525
71%
525
22%
1154
September1st to 15thNight
71%
586
15%
1741
16%
586
71%
586
26%
1153
September16th to endNight
67%
657
26%
1815
21%
657
69%
657
32%
1163
October1st to 15thNight
70%
660
32%
1815
28%
660
73%
660
42%
1035
October16th to endNight
59%
704
34%
2030
28%
704
66%
704
38%
1142
November1st to 15thNight
59%
700
31%
2276
29%
700
67%
700
38%
1198
November16th to endNight
49%
720
29%
2340
23%
720
60%
720
34%
1303
December1st to 15thNight
47%
720
25%
2340
20%
720
55%
720
28%
1389
December16th to endNight
42%
768
20%
2496
16%
768
49%
768
22%
1632

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
9%425%5%35%5%6%9%43%
47341
Night
9%42442446%8%47%
46821
TransparencyDay
33%8%14%20%16%6%
47054
Night
33%6%13%19%18%8%
46612
SeeingDay
11%212%22%32%18%
5091
Night
11%416%25%29%12%
15179

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 15thDay
10%5%245%3445%8%44%
1686
16th to endDay
16%5%24433445%45%
1920
February1st to 15thDay
12%5%24423447%47%
1750
16th to endDay
13%5%24324437%47%
1580
March1st to 15thDay
9%4245%2445%8%48%
1818
16th to endDay
10%41433445%7%49%
2154
April1st to 15thDay
11%5%23325%45%7%48%
2151
16th to endDay
5%315%43445%7%54%
2160
May1st to 15thDay
6%41442446%8%50%
2244
16th to endDay
44145%35%5%8%10%45%
2431
June1st to 15thDay
6%425%5%47%8%9%13%34%
2340
16th to endDay
6%425%5%27%8%9%13%34%
2340
July1st to 15thDay
6%426%6%5%9%8%10%13%26%
2340
16th to endDay
7%435%7%47%10%11%11%25%
2321
August1st to 15thDay
7%5%36%7%48%8%10%13%24%
2112
16th to endDay
10%5%26%6%46%6%8%10%32%
2100
September1st to 15thDay
9%5%25%6%36%9%8%10%32%
1876
16th to endDay
7%325%5%46%7%7%8%42%
1815
October1st to 15thDay
6%3245%2345%8%54%
1815
16th to endDay
9%31431324460%
1838
November1st to 15thDay
8%413324347%56%
1582
16th to endDay
8%314433346%54%
1620
December1st to 15thDay
10%42442435%8%49%
1620
16th to endDay
18%7%35%423336%39%
1728
January1st to 15thNight
12%5%25%42345%6%47%
2250
16th to endNight
15%7%25%423446%43%
2304
February1st to 15thNight
14%5%23323335%51%
2103
16th to endNight
14%6%2442434447%
1893
March1st to 15thNight
10%5%25%3245%5%8%47%
2142
16th to endNight
7%4245%2345%7%52%
2077
April1st to 15thNight
8%5%244245%5%7%47%
1797
16th to endNight
7%323323349%57%
1800
May1st to 15thNight
7%33432345%9%52%
1704
16th to endNight
5%4134245%6%10%51%
1682
June1st to 15thNight
44235%35%7%8%13%41%
1620
16th to endNight
5%3234247%8%12%44%
1620
July1st to 15thNight
42145%46%6%8%14%41%
1620
16th to endNight
43245%36%7%9%14%37%
1844
August1st to 15thNight
5%3146%36%6%9%15%37%
1762
16th to endNight
8%426%5%45%5%8%10%36%
1750
September1st to 15thNight
9%315%5%46%6%8%10%38%
1741
16th to endNight
7%5%25%5%25%45%9%46%
1815
October1st to 15thNight
442341345%9%56%
1815
16th to endNight
8%42332334458%
2030
November1st to 15thNight
6%413323447%57%
2276
16th to endNight
9%314423345%55%
2340
December1st to 15thNight
12%42443445%7%46%
2340
16th to endNight
16%6%35%4245%5%6%39%
2496

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
36%5%9%14%25%8%
1687
16th to endDay
41%46%16%21%9%
1920
February1st to 15thDay
35%49%17%23%10%
1752
16th to endDay
36%6%7%18%22%8%
1580
March1st to 15thDay
32%5%11%23%20%7%
1818
16th to endDay
32%5%13%21%17%9%
2155
April1st to 15thDay
34%5%8%22%21%7%
2151
16th to endDay
26%6%13%25%21%6%
2160
May1st to 15thDay
26%7%15%22%19%8%
2244
16th to endDay
27%8%18%24%17%2
2435
June1st to 15thDay
33%11%18%29%7%
2340
16th to endDay
33%10%22%22%9%1
2340
July1st to 15thDay
37%16%25%16%3
2201
16th to endDay
37%15%27%16%2
2177
August1st to 15thDay
39%15%24%15%4
2100
16th to endDay
39%10%23%18%6%2
2100
September1st to 15thDay
37%11%20%16%11%2
1876
16th to endDay
31%10%14%19%17%6%
1815
October1st to 15thDay
25%6%11%19%24%13%
1815
16th to endDay
28%35%15%28%18%
1838
November1st to 15thDay
27%47%21%26%12%
1582
16th to endDay
30%46%20%22%15%
1620
December1st to 15thDay
34%5%11%21%20%6%
1620
16th to endDay
47%47%20%14%5%
1728
January1st to 15thNight
36%5%8%13%25%9%
2250
16th to endNight
42%36%14%22%9%
2304
February1st to 15thNight
37%35%17%23%12%
2112
16th to endNight
39%47%14%20%13%
1893
March1st to 15thNight
33%6%10%20%21%7%
2142
16th to endNight
30%5%10%24%19%10%
2077
April1st to 15thNight
32%5%10%18%23%9%
1797
16th to endNight
25%411%28%23%7%
1800
May1st to 15thNight
28%5%14%19%22%8%
1705
16th to endNight
26%8%17%24%18%4
1684
June1st to 15thNight
29%11%22%25%10%1
1620
16th to endNight
28%12%24%23%10%1
1620
July1st to 15thNight
29%13%31%20%5%
1530
16th to endNight
31%13%31%18%3
1725
August1st to 15thNight
31%13%32%18%3
1750
16th to endNight
40%10%21%17%7%2
1750
September1st to 15thNight
38%9%20%16%11%2
1741
16th to endNight
35%8%12%18%19%5%
1815
October1st to 15thNight
26%6%7%21%23%14%
1815
16th to endNight
30%35%14%24%21%
2030
November1st to 15thNight
27%46%20%26%14%
2276
16th to endNight
31%46%18%22%17%
2340
December1st to 15thNight
36%5%9%22%20%6%
2340
16th to endNight
43%5%9%19%14%6%
2496

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
17%7%26%28%15%3
90
16th to endDay
18%16%28%27%8%1
96
February1st to 15thDay
5%11%32%24%24%2
90
16th to endDay
11%6%28%41%12%
81
March1st to 15thDay
12%139%36%7%1
108
16th to endDay
11%7%23%31%22%4
288
April1st to 15thDay
14%5%19%32%24%3
270
16th to endDay
8%219%30%32%7%
270
May1st to 15thDay
9%214%34%32%7%
288
16th to endDay
9%16%25%37%20%
331
June1st to 15thDay
13%1416%41%22%
315
16th to endDay
12%312%36%33%
315
July1st to 15thDay
6%16%41%42%
305
16th to endDay
7%1311%39%37%
326
August1st to 15thDay
12%39%39%35%
297
16th to endDay
9%212%38%35%
268
September1st to 15thDay
16%412%38%26%
255
16th to endDay
9%1426%41%16%
254
October1st to 15thDay
8%12%31%36%10%
255
16th to endDay
12%217%26%27%12%
223
November1st to 15thDay
25%12%24%30%7%
90
16th to endDay
35%27%34%22%6%
90
December1st to 15thDay
11%331%37%15%1
90
16th to endDay
29%7%13%28%19%2
96
January1st to 15thNight
14%10%29%29%14%1
720
16th to endNight
19%10%27%29%12%
768
February1st to 15thNight
15%9%28%29%15%1
704
16th to endNight
17%7%31%31%12%
631
March1st to 15thNight
12%5%27%34%17%2
720
16th to endNight
9%419%34%27%3
733
April1st to 15thNight
11%318%33%30%2
539
16th to endNight
9%216%28%34%7%
540
May1st to 15thNight
8%213%28%36%10%
540
16th to endNight
6%8%18%48%17%
563
June1st to 15thNight
5%418%51%20%
540
16th to endNight
7%29%47%32%
540
July1st to 15thNight
6%27%40%42%
510
16th to endNight
6%26%44%39%
564
August1st to 15thNight
7%17%41%40%
527
16th to endNight
12%310%43%29%
525
September1st to 15thNight
11%5%12%43%26%
586
16th to endNight
10%8%26%41%11%
657
October1st to 15thNight
7%211%34%35%8%
660
16th to endNight
12%417%26%31%8%
704
November1st to 15thNight
9%421%33%26%4
700
16th to endNight
11%5%26%31%21%2
720
December1st to 15thNight
16%6%25%30%17%4
720
16th to endNight
19%7%24%30%16%1
768
Page generated at 2017-08-13 13:16:31. Version ac04

Copyright 2017 A. Danko


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