Fort Myers Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Myers Beach clear sky chart from 2005-11-06 to 2024-01-13.

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
65%
24618
13%
74533
11%
24571
67%
24571
16%
56390

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
57%
757
15%
2459
13%
757
62%
757
16%
1776
January11th to 20thNight
56%
732
14%
2378
14%
732
59%
732
14%
1794
January21st to endNight
51%
792
17%
2403
14%
792
54%
792
17%
1781
February1st to 10thNight
54%
720
16%
2160
14%
720
57%
720
17%
1611
February11th to 20thNight
62%
700
16%
2098
12%
699
67%
699
18%
1540
February21st to endNight
66%
592
24%
1665
19%
592
70%
592
23%
1152
March1st to 10thNight
63%
720
21%
1980
13%
720
69%
720
26%
1340
March11th to 20thNight
62%
720
20%
1980
15%
720
66%
720
23%
1385
March21st to endNight
65%
792
22%
2178
16%
792
68%
792
25%
1496
April1st to 10thNight
68%
720
16%
1980
13%
720
70%
720
22%
1392
April11th to 20thNight
63%
711
16%
1953
13%
711
66%
711
22%
1409
April21st to endNight
65%
720
18%
1832
12%
720
68%
720
23%
1355
May1st to 10thNight
78%
658
20%
1738
16%
658
79%
658
28%
1188
May11th to 20thNight
71%
531
12%
1592
9%
531
73%
531
18%
1172
May21st to endNight
73%
582
12%
1745
10%
582
74%
582
15%
1336
June1st to 10thNight
65%
540
8%
1620
7%
540
65%
540
11%
1341
June11th to 20thNight
76%
540
8%
1620
7%
540
76%
540
15%
1263
June21st to endNight
75%
540
6%
1620
5%
540
75%
540
11%
1346
July1st to 10thNight
74%
525
4%
1575
4%
525
74%
525
10%
1322
July11th to 20thNight
77%
522
3%
1566
3%
522
77%
522
10%
1339
July21st to endNight
77%
591
5%
1672
5%
558
78%
558
12%
1367
August1st to 10thNight
75%
537
3%
1612
3%
534
76%
534
12%
1325
August11th to 20thNight
75%
587
3%
1829
4%
587
75%
587
11%
1501
August21st to endNight
63%
792
3%
2178
3%
792
63%
792
8%
1876
September1st to 10thNight
70%
720
3%
1980
3%
720
70%
720
11%
1652
September11th to 20thNight
67%
720
4%
1980
5%
720
67%
720
10%
1670
September21st to endNight
61%
720
5%
1980
5%
720
61%
720
10%
1681
October1st to 10thNight
66%
720
12%
1980
12%
720
68%
720
16%
1547
October11th to 20thNight
64%
720
15%
2133
14%
720
66%
720
14%
1655
October21st to endNight
62%
792
16%
2376
16%
792
65%
792
17%
1770
November1st to 10thNight
62%
740
18%
2221
16%
740
67%
740
17%
1642
November11th to 20thNight
58%
760
19%
2280
16%
760
62%
760
17%
1672
November21st to endNight
61%
760
16%
2308
15%
760
64%
760
17%
1714
December1st to 10thNight
64%
760
17%
2470
17%
760
68%
760
17%
1784
December11th to 20thNight
59%
759
16%
2921
12%
758
62%
758
12%
2060
December21st to endNight
60%
826
10%
4471
15%
817
64%
817
10%
3136

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%425%6%46%6%7%10%43%
74825
Night
7%5%25%5%35%6%7%10%44%
74923
TransparencyDay
23%41%11%13%9%3
74548
Night
23%40%11%14%10%3
74719
SeeingDay
6%313%27%30%22%
14508
Night
8%215%33%31%12%
24637

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
6%435%436%5%5%9%49%
1706
11th to 20thDay
7%5%244245%7%11%48%
1644
21st to endDay
9%6%25%5%35%5%5%8%48%
1948
February1st to 10thDay
9%435%43446%9%50%
1800
11th to 20thDay
5%32332345%8%62%
1748
21st to endDay
5%41342445%11%57%
1588
March1st to 10thDay
311333445%8%65%
1980
11th to 20thDay
6%32343447%9%57%
1980
21st to endDay
33245%3445%8%60%
2178
April1st to 10thDay
32134245%6%11%59%
1980
11th to 20thDay
5%4135%345%6%11%54%
1956
21st to endDay
4214435%46%10%57%
2128
May1st to 10thDay
321221336%10%67%
2236
11th to 20thDay
7%425%5%36%6%7%10%46%
2301
21st to endDay
7%435%446%7%7%9%44%
2531
June1st to 10thDay
12%6%36%6%36%7%8%11%31%
2340
11th to 20thDay
7%425%6%5%8%7%10%13%33%
2340
21st to endDay
6%5%26%7%5%7%9%11%13%28%
2340
July1st to 10thDay
6%436%8%5%9%10%10%12%27%
2340
11th to 20thDay
5%437%7%5%9%9%11%13%27%
2340
21st to endDay
7%426%8%6%9%11%10%12%26%
2547
August1st to 10thDay
5%426%9%5%9%8%10%11%31%
2309
11th to 20thDay
5%427%7%7%7%9%11%15%26%
2053
21st to endDay
8%6%37%9%6%8%8%8%12%26%
2178
September1st to 10thDay
5%426%8%6%8%9%11%13%29%
1980
11th to 20thDay
7%6%26%8%6%8%8%9%10%29%
1980
21st to endDay
9%5%36%7%5%8%8%10%11%29%
1980
October1st to 10thDay
6%5%27%7%46%6%8%10%37%
1980
11th to 20thDay
7%6%25%5%36%6%7%10%43%
1823
21st to endDay
8%425%5%45%6%7%7%48%
1980
November1st to 10thDay
6%42442447%8%54%
1857
11th to 20thDay
7%426%5%35%6%6%11%47%
1900
21st to endDay
5%3235%345%6%9%52%
1867
December1st to 10thDay
7%4245%35%45%8%53%
1710
11th to 20thDay
8%4245%345%7%9%47%
2153
21st to endDay
9%5%27%7%46%7%6%10%37%
3124
January1st to 10thNight
7%425%435%6%7%10%47%
2459
11th to 20thNight
9%5%245%35%5%7%10%45%
2378
21st to endNight
9%5%25%5%35%6%6%9%45%
2403
February1st to 10thNight
9%6%35%5%35%5%5%6%48%
2160
11th to 20thNight
7%42443345%9%56%
2098
21st to endNight
5%22443445%8%58%
1665
March1st to 10thNight
331332445%9%63%
1980
11th to 20thNight
6%3243345%6%9%54%
1980
21st to endNight
33244345%6%10%59%
2178
April1st to 10thNight
6%2143245%7%10%55%
1980
11th to 20thNight
5%325%5%345%7%10%52%
1953
21st to endNight
44245%36%5%6%8%53%
1832
May1st to 10thNight
2213335%45%9%61%
1738
11th to 20thNight
7%3345%36%6%6%8%46%
1592
21st to endNight
6%6%246%37%6%7%9%44%
1744
June1st to 10thNight
12%6%36%7%48%6%9%9%31%
1620
11th to 20thNight
6%435%5%5%7%8%8%14%35%
1620
21st to endNight
5%5%36%8%6%8%8%9%13%30%
1620
July1st to 10thNight
6%437%7%47%7%10%13%32%
1620
11th to 20thNight
46%36%6%48%8%12%13%30%
1620
21st to endNight
4426%8%5%8%9%10%13%31%
1771
August1st to 10thNight
5%6%37%8%6%6%7%9%13%31%
1623
11th to 20thNight
6%436%7%38%9%10%14%29%
1829
21st to endNight
9%7%38%7%47%7%9%13%26%
2178
September1st to 10thNight
45%27%8%5%8%9%10%13%29%
1980
11th to 20thNight
8%6%37%8%5%6%7%9%12%30%
1980
21st to endNight
11%6%39%6%5%7%7%7%11%27%
1980
October1st to 10thNight
6%6%36%6%36%6%7%10%41%
1980
11th to 20thNight
7%5%36%6%45%5%5%8%45%
2133
21st to endNight
8%5%25%5%35%5%6%8%46%
2376
November1st to 10thNight
7%4345%345%5%8%52%
2221
11th to 20thNight
8%5%26%5%3446%8%49%
2280
21st to endNight
7%425%5%346%6%9%48%
2308
December1st to 10thNight
6%425%435%6%6%9%51%
2470
11th to 20thNight
9%6%35%43445%9%50%
3042
21st to endNight
10%7%36%6%46%6%7%10%36%
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
19%42%7%16%12%4
1707
11th to 20thDay
18%44%7%16%10%5%
1644
21st to endDay
22%39%7%16%10%6%
1948
February1st to 10thDay
24%37%5%13%16%5%
1800
11th to 20thDay
16%38%9%19%12%6%
1758
21st to endDay
15%37%7%14%21%6%
1588
March1st to 10thDay
12%37%7%20%19%5%
1980
11th to 20thDay
16%38%8%20%15%4
1980
21st to endDay
14%37%7%21%16%4
2178
April1st to 10thDay
14%39%14%19%11%4
1980
11th to 20thDay
16%38%12%21%11%3
1956
21st to endDay
15%39%9%16%18%3
2128
May1st to 10thDay
8%37%11%26%18%1
2236
11th to 20thDay
19%40%14%16%10%1
2305
21st to endDay
23%42%10%17%7%1
2531
June1st to 10thDay
29%42%14%12%3
2340
11th to 20thDay
26%40%17%13%3
2340
21st to endDay
32%42%16%8%1
2340
July1st to 10thDay
31%46%16%7%
2275
11th to 20thDay
33%45%16%6%1
2271
21st to endDay
29%47%14%8%
2405
August1st to 10thDay
28%46%18%6%1
2296
11th to 20thDay
30%45%18%7%
2053
21st to endDay
35%44%13%7%1
2178
September1st to 10thDay
29%45%17%8%
1980
11th to 20thDay
33%44%12%9%2
1980
21st to endDay
32%43%13%8%31
1980
October1st to 10thDay
24%42%10%9%10%4
1980
11th to 20thDay
25%41%8%14%9%3
1823
21st to endDay
22%39%7%12%17%3
1980
November1st to 10thDay
19%41%411%15%10%
1857
11th to 20thDay
19%42%6%15%14%5%
1900
21st to endDay
18%42%7%15%14%3
1867
December1st to 10thDay
19%41%9%16%11%4
1710
11th to 20thDay
25%35%6%15%12%7%
2150
21st to endDay
33%29%9%12%13%3
3124
January1st to 10thNight
18%42%8%17%11%4
2459
11th to 20thNight
22%42%6%16%10%4
2378
21st to endNight
22%39%9%15%11%5%
2403
February1st to 10thNight
25%36%6%11%15%6%
2160
11th to 20thNight
21%38%7%17%12%4
2099
21st to endNight
16%37%7%15%20%6%
1665
March1st to 10thNight
13%36%6%22%19%5%
1980
11th to 20thNight
16%37%9%20%14%4
1980
21st to endNight
13%37%9%21%15%4
2178
April1st to 10thNight
16%38%12%20%10%3
1980
11th to 20thNight
17%38%10%18%13%4
1953
21st to endNight
18%39%7%17%17%3
1832
May1st to 10thNight
12%37%10%23%17%1
1738
11th to 20thNight
20%39%13%17%9%
1593
21st to endNight
24%40%10%16%9%
1745
June1st to 10thNight
31%42%11%12%3
1620
11th to 20thNight
24%41%18%14%3
1620
21st to endNight
30%43%16%7%3
1620
July1st to 10thNight
29%46%17%7%1
1575
11th to 20thNight
31%46%17%6%1
1566
21st to endNight
26%46%19%10%
1672
August1st to 10thNight
29%43%19%8%
1612
11th to 20thNight
29%44%21%5%
1829
21st to endNight
34%45%15%6%1
2178
September1st to 10thNight
28%46%19%6%1
1980
11th to 20thNight
31%44%15%9%1
1980
21st to endNight
34%42%12%7%4
1980
October1st to 10thNight
25%40%12%11%9%4
1980
11th to 20thNight
26%40%8%14%9%3
2133
21st to endNight
23%39%6%14%15%3
2376
November1st to 10thNight
19%41%411%15%8%
2221
11th to 20thNight
20%40%6%16%14%4
2280
21st to endNight
21%41%8%14%13%3
2308
December1st to 10thNight
18%41%9%16%12%3
2470
11th to 20thNight
25%34%5%16%11%8%
3044
21st to endNight
32%30%11%10%13%3
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
9%6%31%36%17%1
270
11th to 20thDay
7%7%27%36%18%4
248
21st to endDay
10%10%34%36%10%
264
February1st to 10thDay
5%9%20%37%26%4
240
11th to 20thDay
4319%45%23%5%
240
21st to endDay
5%321%40%28%3
306
March1st to 10thDay
3330%42%21%2
420
11th to 20thDay
6%424%36%26%3
420
21st to endDay
3221%44%27%3
462
April1st to 10thDay
3425%40%21%5%
420
11th to 20thDay
6%5%19%40%27%4
412
21st to endDay
5%317%37%35%4
420
May1st to 10thDay
410%39%33%13%
423
11th to 20thDay
9%13%30%31%16%
447
21st to endDay
7%17%21%36%27%
485
June1st to 10thDay
13%27%19%36%23%
450
11th to 20thDay
7%16%15%34%38%
450
21st to endDay
4411%30%51%
450
July1st to 10thDay
5%116%30%57%
445
11th to 20thDay
3210%33%52%
444
21st to endDay
6%2212%30%48%
488
August1st to 10thDay
5%28%34%51%
446
11th to 20thDay
5%37%34%51%
439
21st to endDay
10%16%14%31%39%
495
September1st to 10thDay
5%2312%30%48%
450
11th to 20thDay
6%16%13%35%39%
450
21st to endDay
7%15%15%37%36%
450
October1st to 10thDay
7%210%31%37%13%
450
11th to 20thDay
7%412%30%34%14%
450
21st to endDay
7%214%31%35%11%
495
November1st to 10thDay
7%218%30%33%10%
455
11th to 20thDay
9%319%36%24%8%
460
21st to endDay
5%418%41%28%4
427
December1st to 10thDay
7%324%34%24%8%
270
11th to 20thDay
6%7%19%36%26%5%
270
21st to endDay
5%6%24%32%27%6%
297
January1st to 10thNight
9%5%23%40%22%2
760
11th to 20thNight
10%423%43%19%1
732
21st to endNight
11%6%26%41%17%1
792
February1st to 10thNight
11%5%23%42%19%1
720
11th to 20thNight
7%5%22%43%23%1
703
21st to endNight
6%218%49%24%1
592
March1st to 10thNight
4425%45%21%1
720
11th to 20thNight
7%321%42%26%
720
21st to endNight
4222%49%21%1
792
April1st to 10thNight
5%219%47%25%1
720
11th to 20thNight
4420%49%22%2
711
21st to endNight
6%220%47%23%2
720
May1st to 10thNight
3113%46%34%3
658
11th to 20thNight
8%29%38%40%3
531
21st to endNight
8%16%33%44%7%
584
June1st to 10thNight
13%16%20%45%14%
540
11th to 20thNight
5%1312%47%31%
540
21st to endNight
41312%42%39%
540
July1st to 10thNight
6%36%38%47%
525
11th to 20thNight
437%41%44%
522
21st to endNight
5%129%36%48%
591
August1st to 10thNight
5%119%43%39%
537
11th to 20thNight
7%126%38%47%
587
21st to endNight
10%17%15%38%28%
792
September1st to 10thNight
6%5%14%46%29%
720
11th to 20thNight
10%15%16%43%25%
720
21st to endNight
13%26%20%41%19%
720
October1st to 10thNight
9%210%37%33%8%
720
11th to 20thNight
8%313%32%36%8%
720
21st to endNight
10%316%38%29%5%
792
November1st to 10thNight
8%221%39%26%4
740
11th to 20thNight
8%322%38%25%3
760
21st to endNight
9%316%43%27%1
760
December1st to 10thNight
8%318%40%28%3
760
11th to 20thNight
9%420%37%28%2
760
21st to endNight
9%321%39%26%2
836
Page generated at 2024-01-10 19:35:21. Version ac07

Copyright 2024 Attilla Danko


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