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Fort Myers
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Myers clear sky chart from 2005-11-06 to 2024-03-23.

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
62%
24883
19%
80181
17%
24787
66%
24787
27%
50676

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
53%
753
20%
4051
19%
737
63%
737
19%
2374
January11th to 20thNight
53%
757
15%
4106
20%
740
62%
740
15%
2875
January21st to endNight
47%
827
17%
4171
17%
814
55%
814
18%
2427
February1st to 10thNight
49%
760
25%
2280
19%
760
56%
760
32%
1388
February11th to 20thNight
56%
740
27%
2218
19%
739
64%
739
40%
1225
February21st to endNight
60%
628
31%
1764
23%
628
67%
628
44%
962
March1st to 10thNight
56%
760
32%
2090
21%
760
65%
760
50%
1101
March11th to 20thNight
56%
760
29%
2090
19%
760
63%
760
41%
1200
March21st to endNight
59%
801
31%
2201
22%
801
66%
801
45%
1214
April1st to 10thNight
61%
720
25%
1980
20%
720
65%
720
43%
1105
April11th to 20thNight
59%
711
21%
1953
16%
711
63%
711
41%
1132
April21st to endNight
57%
720
29%
1821
19%
720
61%
720
42%
1086
May1st to 10thNight
73%
658
29%
1738
22%
658
76%
658
53%
927
May11th to 20thNight
70%
531
15%
1592
11%
531
73%
531
31%
997
May21st to endNight
74%
582
20%
1745
18%
582
74%
582
32%
1080
June1st to 10thNight
67%
540
12%
1620
10%
540
68%
540
21%
1165
June11th to 20thNight
73%
540
9%
1620
8%
540
74%
540
23%
1110
June21st to endNight
76%
540
9%
1620
9%
540
76%
540
21%
1199
July1st to 10thNight
73%
525
5%
1575
5%
525
73%
525
21%
1170
July11th to 20thNight
75%
522
5%
1566
5%
522
75%
522
21%
1158
July21st to endNight
78%
591
7%
1672
7%
558
79%
558
21%
1228
August1st to 10thNight
72%
537
4%
1600
4%
534
73%
534
20%
1195
August11th to 20thNight
76%
588
4%
1822
5%
588
76%
588
19%
1317
August21st to endNight
61%
792
6%
2178
5%
792
62%
792
15%
1676
September1st to 10thNight
69%
720
6%
1980
6%
720
69%
720
18%
1473
September11th to 20thNight
66%
720
7%
1980
7%
720
66%
720
18%
1487
September21st to endNight
59%
720
11%
1980
10%
720
60%
720
17%
1506
October1st to 10thNight
63%
720
19%
1980
17%
720
66%
720
28%
1302
October11th to 20thNight
61%
720
23%
2142
22%
720
65%
720
30%
1349
October21st to endNight
62%
792
25%
2376
25%
792
65%
792
33%
1428
November1st to 10thNight
59%
740
26%
2221
23%
740
65%
740
35%
1311
November11th to 20thNight
57%
760
27%
2280
24%
760
63%
760
33%
1371
November21st to endNight
59%
760
28%
2308
25%
760
66%
760
34%
1338
December1st to 10thNight
59%
760
26%
2470
24%
760
66%
760
34%
1398
December11th to 20thNight
57%
759
25%
2924
23%
758
62%
758
27%
1620
December21st to endNight
56%
829
14%
4467
23%
817
61%
817
18%
2782

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
8%5%26%6%46%6%7%10%39%
79153
Night
8%5%36%6%45%6%7%9%43%
80737
TransparencyDay
38%10%16%18%13%4
78876
Night
35%10%17%20%14%4
80533
SeeingDay
7%417%26%26%21%
14749
Night
8%317%33%29%10%
24915

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
11%8%45%5%345%5%8%42%
2836
11th to 20thDay
17%8%36%5%35%46%9%33%
2840
21st to endDay
8%6%36%6%45%6%6%8%42%
3388
February1st to 10thDay
9%425%5%345%6%8%49%
1900
11th to 20thDay
5%22342446%8%60%
1848
21st to endDay
6%413435%6%5%10%54%
1689
March1st to 10thDay
4314435%45%8%60%
2090
11th to 20thDay
6%3145%345%6%9%56%
2090
21st to endDay
5%42443445%7%57%
2200
April1st to 10thDay
5%313435%5%6%10%55%
1980
11th to 20thDay
6%4146%35%6%7%10%48%
1956
21st to endDay
5%3245%35%5%5%9%54%
2137
May1st to 10thDay
3212325%5%6%8%63%
2236
11th to 20thDay
8%436%6%46%7%6%9%42%
2301
21st to endDay
7%5%36%7%47%6%7%9%39%
2531
June1st to 10thDay
13%8%38%7%5%7%7%7%11%24%
2340
11th to 20thDay
8%5%36%8%6%9%9%9%12%27%
2340
21st to endDay
8%6%46%9%6%9%8%9%12%24%
2340
July1st to 10thDay
6%6%47%10%6%8%8%9%10%24%
2340
11th to 20thDay
6%6%38%8%5%8%10%10%12%24%
2340
21st to endDay
7%5%38%10%5%9%9%9%11%23%
2547
August1st to 10thDay
6%427%8%6%9%8%10%13%25%
2327
11th to 20thDay
6%5%38%8%5%10%9%11%12%23%
2052
21st to endDay
10%6%29%9%5%8%9%9%9%23%
2178
September1st to 10thDay
7%5%28%9%6%8%9%9%13%24%
1980
11th to 20thDay
9%6%48%10%5%8%8%9%8%26%
1980
21st to endDay
9%6%48%9%5%8%7%8%10%26%
1980
October1st to 10thDay
7%6%37%8%5%6%7%6%9%36%
1980
11th to 20thDay
7%5%25%6%46%5%7%9%42%
1816
21st to endDay
8%425%5%35%7%6%8%47%
1980
November1st to 10thDay
7%424435%46%8%52%
1857
11th to 20thDay
8%426%5%35%6%5%10%45%
1900
21st to endDay
6%425%436%7%6%9%48%
1867
December1st to 10thDay
7%425%5%35%5%6%9%49%
1710
11th to 20thDay
8%425%5%345%7%9%47%
2153
21st to endDay
10%6%36%7%5%6%7%8%9%34%
3124
January1st to 10thNight
9%6%36%6%46%6%7%10%38%
4109
11th to 20thNight
17%8%47%7%45%5%6%8%29%
4120
21st to endNight
7%5%37%7%46%6%6%8%41%
4264
February1st to 10thNight
10%5%35%5%345%5%7%48%
2280
11th to 20thNight
8%5%2432445%8%55%
2218
21st to endNight
6%32343445%9%57%
1764
March1st to 10thNight
432332346%8%61%
2090
11th to 20thNight
6%3245%35%5%6%9%53%
2090
21st to endNight
4325%435%46%9%57%
2201
April1st to 10thNight
5%2245%345%6%10%55%
1980
11th to 20thNight
5%3246%245%7%10%52%
1953
21st to endNight
5%325%5%35%5%6%8%53%
1821
May1st to 10thNight
222242446%9%62%
1738
11th to 20thNight
7%326%6%36%6%7%8%45%
1592
21st to endNight
7%426%5%45%5%6%8%46%
1744
June1st to 10thNight
11%6%36%6%5%6%7%8%10%32%
1620
11th to 20thNight
6%436%6%47%7%8%13%35%
1620
21st to endNight
5%5%28%8%6%8%6%9%12%31%
1620
July1st to 10thNight
6%5%38%8%46%8%8%12%32%
1620
11th to 20thNight
6%5%37%7%47%8%11%13%30%
1620
21st to endNight
5%427%8%5%7%9%11%13%29%
1771
August1st to 10thNight
5%5%38%8%48%7%9%13%30%
1611
11th to 20thNight
6%437%6%5%8%8%9%13%32%
1822
21st to endNight
9%6%38%7%47%7%10%10%28%
2178
September1st to 10thNight
5%5%37%8%5%7%9%9%13%29%
1980
11th to 20thNight
9%5%37%6%5%7%7%9%11%30%
1980
21st to endNight
11%8%38%8%5%6%7%7%10%28%
1980
October1st to 10thNight
8%5%26%7%446%7%9%42%
1980
11th to 20thNight
8%6%35%7%35%5%6%7%45%
2142
21st to endNight
8%435%5%35%5%6%7%48%
2376
November1st to 10thNight
9%4245%245%5%7%52%
2221
11th to 20thNight
8%435%5%45%45%8%49%
2280
21st to endNight
8%426%5%3445%9%50%
2308
December1st to 10thNight
7%435%5%245%5%7%52%
2470
11th to 20thNight
9%6%25%43445%7%50%
3042
21st to endNight
11%6%37%6%46%6%6%8%37%
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%6%9%22%18%5%
2837
11th to 20thDay
46%7%10%18%16%4
2840
21st to endDay
38%7%9%22%19%5%
3388
February1st to 10thDay
33%5%12%23%20%7%
1900
11th to 20thDay
21%6%11%27%23%12%
1858
21st to endDay
26%6%13%19%26%10%
1689
March1st to 10thDay
22%6%12%28%24%8%
2090
11th to 20thDay
26%6%13%28%20%8%
2090
21st to endDay
26%5%13%25%23%9%
2200
April1st to 10thDay
23%8%20%28%15%6%
1980
11th to 20thDay
29%8%17%24%18%5%
1956
21st to endDay
26%7%14%22%26%5%
2137
May1st to 10thDay
18%6%16%26%26%7%
2236
11th to 20thDay
37%9%17%21%15%1
2305
21st to endDay
39%9%15%20%15%1
2531
June1st to 10thDay
51%12%20%14%3
2340
11th to 20thDay
45%15%22%16%2
2340
21st to endDay
50%15%23%11%1
2340
July1st to 10thDay
50%17%23%9%1
2275
11th to 20thDay
48%18%25%9%
2271
21st to endDay
49%18%23%9%1
2405
August1st to 10thDay
44%18%30%8%1
2314
11th to 20thDay
46%20%26%8%
2052
21st to endDay
52%17%21%8%2
2178
September1st to 10thDay
48%19%22%11%
1980
11th to 20thDay
50%17%18%11%3
1980
21st to endDay
49%14%16%13%6%1
1980
October1st to 10thDay
43%10%16%16%11%5%
1980
11th to 20thDay
37%9%12%21%16%5%
1816
21st to endDay
34%7%12%17%22%8%
1980
November1st to 10thDay
30%6%13%21%18%12%
1857
11th to 20thDay
34%7%11%21%19%7%
1900
21st to endDay
31%7%12%22%21%6%
1867
December1st to 10thDay
31%6%13%27%18%5%
1710
11th to 20thDay
32%7%10%22%17%11%
2150
21st to endDay
42%9%13%18%15%3
3124
January1st to 10thNight
38%9%12%21%16%4
4109
11th to 20thNight
51%8%9%18%10%3
4120
21st to endNight
39%7%10%18%21%5%
4264
February1st to 10thNight
35%6%11%21%19%7%
2280
11th to 20thNight
27%6%10%25%22%11%
2219
21st to endNight
24%6%12%22%29%8%
1764
March1st to 10thNight
20%5%13%30%25%7%
2090
11th to 20thNight
26%8%14%28%18%6%
2090
21st to endNight
23%6%13%27%24%6%
2201
April1st to 10thNight
23%8%18%32%15%5%
1980
11th to 20thNight
26%7%18%24%20%5%
1953
21st to endNight
26%8%13%26%24%4
1821
May1st to 10thNight
19%6%14%30%24%7%
1738
11th to 20thNight
33%10%20%22%15%
1593
21st to endNight
33%9%18%22%18%
1745
June1st to 10thNight
44%12%21%19%4
1620
11th to 20thNight
38%14%28%17%3
1620
21st to endNight
41%17%25%13%4
1620
July1st to 10thNight
41%18%31%10%1
1575
11th to 20thNight
39%18%32%10%1
1566
21st to endNight
37%20%29%13%
1672
August1st to 10thNight
41%18%29%12%1
1600
11th to 20thNight
38%20%33%9%
1822
21st to endNight
46%19%25%9%1
2178
September1st to 10thNight
41%20%27%11%1
1980
11th to 20thNight
44%17%23%13%2
1980
21st to endNight
48%14%18%12%7%1
1980
October1st to 10thNight
36%11%19%18%12%4
1980
11th to 20thNight
35%9%14%19%20%4
2142
21st to endNight
33%7%14%18%21%8%
2376
November1st to 10thNight
31%7%12%21%19%10%
2221
11th to 20thNight
32%8%11%23%19%7%
2280
21st to endNight
31%7%13%22%22%6%
2308
December1st to 10thNight
31%6%14%27%17%4
2470
11th to 20thNight
32%6%9%23%18%11%
3044
21st to endNight
41%9%16%16%14%4
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%40%32%13%1
270
11th to 20thDay
11%10%33%32%11%3
270
21st to endDay
12%9%44%26%8%
297
February1st to 10thDay
6%9%29%31%21%4
270
11th to 20thDay
6%5%34%34%16%4
270
21st to endDay
5%7%26%38%21%3
344
March1st to 10thDay
37%35%36%17%3
460
11th to 20thDay
6%5%28%35%23%3
460
21st to endDay
4426%36%28%3
470
April1st to 10thDay
6%6%28%35%20%5%
420
11th to 20thDay
6%7%22%36%23%6%
412
21st to endDay
5%419%35%29%8%
420
May1st to 10thDay
3116%34%31%14%
423
11th to 20thDay
9%217%28%26%18%
447
21st to endDay
8%29%23%32%27%
485
June1st to 10thDay
14%19%20%31%25%
450
11th to 20thDay
6%18%18%30%38%
450
21st to endDay
5%1313%26%52%
450
July1st to 10thDay
5%129%26%56%
445
11th to 20thDay
439%32%51%
444
21st to endDay
8%1416%25%47%
488
August1st to 10thDay
5%49%32%50%
446
11th to 20thDay
6%39%31%51%
439
21st to endDay
9%27%16%27%39%
495
September1st to 10thDay
7%2414%29%45%
450
11th to 20thDay
8%2418%32%36%
450
21st to endDay
8%15%18%35%32%
450
October1st to 10thDay
7%411%33%34%11%
450
11th to 20thDay
9%414%32%29%12%
450
21st to endDay
8%416%33%30%9%
495
November1st to 10thDay
8%420%31%27%10%
455
11th to 20thDay
10%425%32%23%6%
460
21st to endDay
7%423%40%24%2
427
December1st to 10thDay
7%6%27%37%17%6%
270
11th to 20thDay
6%9%26%36%19%5%
270
21st to endDay
6%10%25%34%20%5%
297
January1st to 10thNight
10%6%24%40%19%1
760
11th to 20thNight
11%5%25%43%16%
760
21st to endNight
10%7%30%40%13%
836
February1st to 10thNight
10%7%26%41%15%1
760
11th to 20thNight
8%5%25%43%17%1
743
21st to endNight
6%425%47%18%
628
March1st to 10thNight
45%31%44%15%1
760
11th to 20thNight
7%327%43%19%
760
21st to endNight
4425%49%17%1
801
April1st to 10thNight
5%5%22%45%22%
720
11th to 20thNight
5%426%44%19%1
711
21st to endNight
6%326%45%19%1
720
May1st to 10thNight
3118%47%29%3
658
11th to 20thNight
8%110%43%34%4
531
21st to endNight
8%18%33%43%7%
584
June1st to 10thNight
12%17%22%45%13%
540
11th to 20thNight
5%1413%50%28%
540
21st to endNight
5%213%44%36%
540
July1st to 10thNight
6%137%43%39%
525
11th to 20thNight
4138%42%41%
522
21st to endNight
5%139%39%43%
591
August1st to 10thNight
7%138%47%35%
537
11th to 20thNight
8%116%42%41%
588
21st to endNight
11%27%15%38%26%
792
September1st to 10thNight
7%1417%45%26%
720
11th to 20thNight
12%25%16%43%23%
720
21st to endNight
14%27%19%39%20%
720
October1st to 10thNight
10%113%37%32%7%
720
11th to 20thNight
9%316%32%35%6%
720
21st to endNight
10%317%39%28%4
792
November1st to 10thNight
9%322%39%24%4
740
11th to 20thNight
8%424%41%22%3
760
21st to endNight
9%321%41%24%1
760
December1st to 10thNight
7%421%39%27%2
760
11th to 20thNight
9%5%22%39%23%2
760
21st to endNight
9%424%38%24%1
836
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