Fort Lauderdale
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Lauderdale clear sky chart from 2005-11-06 to 2024-03-28.

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
64%
25319
10%
80331
9%
25225
66%
25225
13%
61875

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%
750
11%
4060
11%
737
63%
737
10%
2829
January11th to 20thNight
50%
754
8%
4111
9%
740
55%
740
6%
3298
January21st to endNight
50%
829
9%
4438
12%
814
55%
814
10%
3034
February1st to 10thNight
55%
760
18%
2280
15%
760
60%
760
17%
1685
February11th to 20thNight
59%
742
18%
2085
12%
739
65%
739
20%
1517
February21st to endNight
63%
628
22%
1727
17%
628
66%
628
23%
1205
March1st to 10thNight
56%
760
18%
2090
10%
760
63%
760
23%
1476
March11th to 20thNight
63%
760
17%
2090
13%
760
68%
760
23%
1477
March21st to endNight
61%
821
18%
2256
15%
821
64%
821
22%
1602
April1st to 10thNight
72%
720
16%
1980
14%
720
73%
720
23%
1403
April11th to 20thNight
62%
711
13%
1853
10%
711
64%
711
21%
1376
April21st to endNight
66%
720
15%
1800
9%
720
69%
720
20%
1351
May1st to 10thNight
75%
720
17%
1800
12%
720
76%
720
26%
1271
May11th to 20thNight
62%
709
7%
1771
5%
709
62%
709
16%
1416
May21st to endNight
70%
598
6%
1760
6%
598
70%
598
13%
1442
June1st to 10thNight
61%
540
5%
1620
4%
540
62%
540
8%
1395
June11th to 20thNight
75%
540
7%
1620
7%
540
75%
540
13%
1288
June21st to endNight
77%
540
4%
1620
3%
540
77%
540
9%
1366
July1st to 10thNight
72%
525
3%
1575
3%
525
72%
525
9%
1344
July11th to 20thNight
79%
522
4%
1566
4%
522
79%
522
10%
1302
July21st to endNight
81%
591
6%
1672
6%
558
82%
558
13%
1334
August1st to 10thNight
77%
577
5%
1640
5%
574
78%
574
14%
1291
August11th to 20thNight
77%
710
4%
1774
3%
710
77%
710
13%
1468
August21st to endNight
67%
792
3%
2104
3%
792
68%
792
10%
1787
September1st to 10thNight
69%
720
4%
1980
3%
720
69%
720
10%
1657
September11th to 20thNight
67%
720
2%
1980
2%
720
67%
720
8%
1698
September21st to endNight
57%
720
5%
1980
5%
720
58%
720
7%
1749
October1st to 10thNight
63%
720
7%
2078
8%
720
63%
720
11%
1707
October11th to 20thNight
66%
720
10%
2160
9%
720
68%
720
13%
1720
October21st to endNight
59%
792
12%
2376
12%
792
61%
792
13%
1866
November1st to 10thNight
57%
740
14%
2221
11%
740
62%
740
14%
1700
November11th to 20thNight
57%
760
14%
2280
13%
760
59%
760
12%
1810
November21st to endNight
59%
760
12%
2280
11%
760
62%
760
14%
1741
December1st to 10thNight
62%
760
15%
2284
12%
760
66%
760
15%
1747
December11th to 20thNight
57%
759
12%
2940
10%
758
60%
758
10%
2207
December21st to endNight
59%
829
8%
4480
13%
817
63%
817
8%
3316

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%6%37%7%5%7%8%9%11%30%
79167
Night
7%6%36%6%46%6%7%10%38%
80831
TransparencyDay
29%40%11%11%7%2
78890
Night
27%39%12%13%8%2
80627
SeeingDay
7%315%29%28%18%
15152
Night
7%315%32%31%12%
25353

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
10%7%46%6%45%5%7%9%37%
2836
11th to 20thDay
16%8%48%7%5%6%6%7%9%24%
2840
21st to endDay
7%6%39%8%5%6%7%6%8%35%
3134
February1st to 10thDay
9%6%36%5%47%5%7%10%38%
1900
11th to 20thDay
7%5%24435%6%8%10%46%
1978
21st to endDay
6%435%6%5%6%6%7%9%43%
1727
March1st to 10thDay
4426%7%47%7%8%11%41%
2090
11th to 20thDay
7%425%5%46%7%8%9%44%
2090
21st to endDay
6%426%6%36%7%7%9%44%
2255
April1st to 10thDay
3425%5%36%8%9%13%41%
1980
11th to 20thDay
6%5%36%7%47%7%8%12%36%
2052
21st to endDay
6%335%5%48%7%8%11%40%
2160
May1st to 10thDay
42245%36%8%10%13%44%
2160
11th to 20thDay
9%7%48%8%5%6%7%9%11%26%
2124
21st to endDay
9%7%48%7%5%8%8%9%10%25%
2527
June1st to 10thDay
13%8%5%10%10%7%8%8%9%8%15%
2340
11th to 20thDay
6%5%49%11%7%10%10%9%11%18%
2340
21st to endDay
5%7%48%8%6%9%10%10%12%21%
2340
July1st to 10thDay
6%6%47%8%5%9%9%11%13%20%
2340
11th to 20thDay
6%6%37%7%5%9%9%11%13%24%
2340
21st to endDay
3437%10%6%9%10%11%14%23%
2547
August1st to 10thDay
5%6%38%9%6%8%9%12%12%22%
2268
11th to 20thDay
45%27%6%5%9%10%11%16%23%
2126
21st to endDay
8%6%38%8%6%9%10%11%13%18%
2246
September1st to 10thDay
7%449%10%7%10%11%9%11%18%
1980
11th to 20thDay
6%5%39%10%6%9%10%10%12%21%
1980
21st to endDay
10%9%410%9%6%9%8%8%9%17%
1980
October1st to 10thDay
8%6%49%10%5%8%8%11%11%21%
1882
11th to 20thDay
9%7%37%7%5%9%8%10%11%26%
1800
21st to endDay
11%7%36%7%47%6%6%10%32%
1980
November1st to 10thDay
8%6%36%6%46%7%9%10%36%
1857
11th to 20thDay
10%7%38%7%5%7%6%8%9%29%
1900
21st to endDay
8%5%37%8%47%7%7%8%36%
1900
December1st to 10thDay
8%5%36%6%47%6%7%9%39%
1891
11th to 20thDay
9%6%36%7%46%5%6%9%38%
2153
21st to endDay
13%7%37%7%46%8%8%10%28%
3124
January1st to 10thNight
8%7%36%7%46%6%7%10%36%
4109
11th to 20thNight
17%9%48%6%46%5%5%8%27%
4120
21st to endNight
6%8%48%7%46%6%6%7%37%
4518
February1st to 10thNight
8%6%35%5%445%7%10%44%
2280
11th to 20thNight
6%424435%5%6%8%54%
2085
21st to endNight
6%225%435%5%6%9%53%
1727
March1st to 10thNight
3325%435%5%7%10%53%
2090
11th to 20thNight
6%3245%345%5%10%54%
2090
21st to endNight
5%425%5%346%6%10%51%
2256
April1st to 10thNight
42144345%8%11%56%
1980
11th to 20thNight
5%325%6%36%6%7%11%45%
1853
21st to endNight
6%5%245%35%5%7%11%48%
1800
May1st to 10thNight
43233345%9%9%56%
1800
11th to 20thNight
7%6%37%6%36%6%9%10%37%
1770
21st to endNight
8%6%47%437%7%8%12%34%
1760
June1st to 10thNight
11%7%49%7%6%8%7%9%9%23%
1620
11th to 20thNight
6%5%36%7%47%8%9%13%32%
1620
21st to endNight
45%36%6%6%6%9%10%14%31%
1620
July1st to 10thNight
5%5%47%8%5%7%6%9%10%34%
1620
11th to 20thNight
5%5%36%6%5%7%7%8%13%37%
1620
21st to endNight
2335%7%46%8%8%14%39%
1771
August1st to 10thNight
6%425%6%48%7%10%15%35%
1651
11th to 20thNight
2425%8%47%8%9%15%37%
1774
21st to endNight
8%5%38%7%46%8%10%14%27%
2104
September1st to 10thNight
5%5%46%9%5%9%9%10%11%28%
1980
11th to 20thNight
6%6%37%8%5%7%8%9%12%28%
1980
21st to endNight
8%8%49%9%6%8%8%8%9%22%
1980
October1st to 10thNight
7%6%37%8%6%8%9%8%11%26%
2078
11th to 20thNight
8%6%36%6%46%6%7%13%34%
2160
21st to endNight
10%6%36%6%46%6%7%8%38%
2376
November1st to 10thNight
9%5%25%6%46%5%6%11%42%
2221
11th to 20thNight
8%7%37%7%5%6%7%6%9%36%
2280
21st to endNight
8%6%26%6%36%6%8%9%40%
2280
December1st to 10thNight
6%5%35%5%45%6%7%10%43%
2284
11th to 20thNight
11%6%36%5%345%6%8%44%
3042
21st to endNight
9%8%48%7%46%7%8%10%30%
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
32%28%8%19%11%3
2837
11th to 20thDay
44%31%10%8%42
2840
21st to endDay
34%26%9%16%10%5%
3134
February1st to 10thDay
26%36%7%16%11%4
1900
11th to 20thDay
22%38%9%18%9%4
1988
21st to endDay
20%37%7%14%16%5%
1727
March1st to 10thDay
21%37%11%17%12%3
2090
11th to 20thDay
20%38%11%18%11%3
2090
21st to endDay
20%37%10%18%12%3
2255
April1st to 10thDay
18%41%13%17%9%2
1980
11th to 20thDay
24%39%12%15%9%1
2052
21st to endDay
22%40%10%14%11%3
2160
May1st to 10thDay
15%38%13%20%13%1
2160
11th to 20thDay
29%41%13%12%4
2128
21st to endDay
34%42%11%10%3
2527
June1st to 10thDay
39%42%10%6%2
2340
11th to 20thDay
35%44%12%8%1
2340
21st to endDay
38%42%14%6%
2340
July1st to 10thDay
33%48%14%5%
2275
11th to 20thDay
32%47%15%6%
2271
21st to endDay
26%48%18%8%
2405
August1st to 10thDay
30%47%17%6%1
2255
11th to 20thDay
29%45%20%6%
2126
21st to endDay
32%48%15%41
2246
September1st to 10thDay
32%47%14%7%1
1980
11th to 20thDay
36%46%13%41
1980
21st to endDay
40%43%9%43
1980
October1st to 10thDay
32%43%12%8%5%1
1882
11th to 20thDay
29%42%11%12%6%1
1800
21st to endDay
30%40%7%12%10%1
1980
November1st to 10thDay
23%42%7%10%13%5%
1857
11th to 20thDay
30%42%6%11%9%2
1900
21st to endDay
25%43%9%11%11%1
1900
December1st to 10thDay
23%43%9%13%10%1
1891
11th to 20thDay
31%35%7%11%12%4
2150
21st to endDay
35%29%11%11%12%2
3124
January1st to 10thNight
31%30%10%15%12%2
4109
11th to 20thNight
46%29%10%9%5%2
4120
21st to endNight
33%27%10%15%9%5%
4518
February1st to 10thNight
24%37%7%17%12%3
2280
11th to 20thNight
19%39%10%19%11%2
2086
21st to endNight
16%36%8%16%19%5%
1727
March1st to 10thNight
16%37%10%17%15%4
2090
11th to 20thNight
17%36%13%19%12%3
2090
21st to endNight
18%37%11%19%13%3
2256
April1st to 10thNight
15%39%15%19%10%2
1980
11th to 20thNight
20%38%14%15%12%2
1853
21st to endNight
19%40%11%15%12%3
1800
May1st to 10thNight
13%39%10%25%13%
1800
11th to 20thNight
25%42%13%14%6%
1771
21st to endNight
29%42%13%13%3
1761
June1st to 10thNight
37%41%14%6%2
1620
11th to 20thNight
26%43%17%12%2
1620
21st to endNight
31%45%15%7%1
1620
July1st to 10thNight
32%46%16%7%1
1575
11th to 20thNight
28%46%19%7%
1566
21st to endNight
21%47%20%10%2
1672
August1st to 10thNight
23%44%21%10%1
1640
11th to 20thNight
24%47%20%9%
1774
21st to endNight
30%47%16%7%1
2104
September1st to 10thNight
29%46%16%8%1
1980
11th to 20thNight
33%45%14%6%1
1980
21st to endNight
39%42%9%6%3
1980
October1st to 10thNight
31%42%12%9%5%1
2078
11th to 20thNight
28%41%13%12%6%1
2160
21st to endNight
28%40%8%13%10%2
2376
November1st to 10thNight
22%43%6%11%13%5%
2221
11th to 20thNight
27%42%7%14%8%2
2280
21st to endNight
22%43%11%13%10%2
2280
December1st to 10thNight
20%44%10%14%10%2
2284
11th to 20thNight
29%35%7%12%10%7%
3044
21st to endNight
36%31%10%10%12%2
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
8%7%29%42%13%1
270
11th to 20thDay
13%7%30%33%16%2
270
21st to endDay
9%8%39%35%8%1
297
February1st to 10thDay
7%10%26%39%17%2
270
11th to 20thDay
6%6%24%39%20%4
401
21st to endDay
5%421%40%29%1
382
March1st to 10thDay
36%32%40%17%3
460
11th to 20thDay
5%5%25%40%22%2
460
21st to endDay
6%126%39%25%4
490
April1st to 10thDay
3328%41%21%5%
420
11th to 20thDay
6%325%38%23%6%
412
21st to endDay
5%316%43%27%6%
420
May1st to 10thDay
5%111%42%30%10%
423
11th to 20thDay
9%313%32%31%12%
447
21st to endDay
9%310%19%36%23%
485
June1st to 10thDay
10%39%25%32%20%
450
11th to 20thDay
6%26%19%34%33%
450
21st to endDay
22412%33%47%
450
July1st to 10thDay
3129%38%48%
445
11th to 20thDay
6%310%40%42%
444
21st to endDay
31314%33%46%
488
August1st to 10thDay
6%1413%35%42%
446
11th to 20thDay
41312%37%44%
439
21st to endDay
8%15%19%35%32%
495
September1st to 10thDay
8%1413%35%39%
450
11th to 20thDay
5%25%16%32%41%
450
21st to endDay
10%36%21%33%28%
450
October1st to 10thDay
10%111%30%36%12%
450
11th to 20thDay
9%312%33%30%12%
450
21st to endDay
9%416%33%31%7%
495
November1st to 10thDay
8%5%18%35%26%7%
455
11th to 20thDay
10%5%24%32%24%5%
460
21st to endDay
6%323%41%25%3
460
December1st to 10thDay
9%320%39%26%3
451
11th to 20thDay
8%5%21%37%24%4
270
21st to endDay
9%8%22%35%20%5%
297
January1st to 10thNight
8%6%21%39%24%2
760
11th to 20thNight
10%6%26%38%20%1
760
21st to endNight
7%6%29%43%15%
836
February1st to 10thNight
9%5%24%41%19%1
760
11th to 20thNight
6%5%25%40%22%1
743
21st to endNight
6%321%47%21%1
628
March1st to 10thNight
5%330%41%19%1
760
11th to 20thNight
7%321%46%22%2
760
21st to endNight
5%423%45%22%2
821
April1st to 10thNight
3316%49%27%2
720
11th to 20thNight
6%420%44%24%2
711
21st to endNight
7%217%47%25%2
720
May1st to 10thNight
4112%46%34%3
720
11th to 20thNight
8%214%41%33%3
709
21st to endNight
8%27%27%45%11%
600
June1st to 10thNight
12%25%22%43%16%
540
11th to 20thNight
6%1215%47%29%
540
21st to endNight
31313%40%40%
540
July1st to 10thNight
5%1210%39%43%
525
11th to 20thNight
41312%38%42%
522
21st to endNight
329%40%46%
591
August1st to 10thNight
7%1110%46%35%
577
11th to 20thNight
31311%45%38%
710
21st to endNight
9%1418%38%30%
792
September1st to 10thNight
6%15%13%40%34%
720
11th to 20thNight
8%25%17%39%30%
720
21st to endNight
10%27%18%38%25%
720
October1st to 10thNight
9%110%33%36%10%
720
11th to 20thNight
10%310%28%41%9%
720
21st to endNight
13%214%35%29%7%
792
November1st to 10thNight
10%322%31%29%4
740
11th to 20thNight
10%319%33%31%4
760
21st to endNight
8%320%42%25%3
760
December1st to 10thNight
7%218%39%31%3
760
11th to 20thNight
9%6%19%33%29%4
760
21st to endNight
7%421%37%28%2
836
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