Fakahatchee Strand Preserve
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fakahatchee Strand Preserve 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
61%
25027
19%
80168
17%
24935
66%
24935
29%
49183

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
55%
752
21%
4040
21%
737
66%
737
21%
2230
January11th to 20thNight
49%
753
14%
4109
18%
740
59%
740
15%
2805
January21st to endNight
45%
827
18%
4208
18%
814
56%
814
20%
2370
February1st to 10thNight
48%
760
27%
2280
19%
760
58%
760
34%
1327
February11th to 20thNight
53%
741
29%
2199
20%
739
64%
739
42%
1172
February21st to endNight
62%
628
35%
1727
25%
628
71%
628
49%
902
March1st to 10thNight
54%
760
32%
2090
20%
760
64%
760
48%
1114
March11th to 20thNight
55%
760
29%
2090
19%
760
62%
760
45%
1145
March21st to endNight
56%
801
33%
2201
24%
801
64%
801
46%
1191
April1st to 10thNight
60%
720
26%
1980
20%
720
66%
720
47%
1057
April11th to 20thNight
56%
711
23%
1943
17%
711
61%
711
44%
1084
April21st to endNight
58%
720
29%
1800
18%
720
63%
720
45%
1063
May1st to 10thNight
69%
720
30%
1800
21%
720
72%
720
57%
955
May11th to 20thNight
70%
563
14%
1624
10%
563
72%
563
36%
983
May21st to endNight
72%
582
21%
1745
18%
582
73%
582
35%
1058
June1st to 10thNight
61%
540
12%
1620
10%
540
62%
540
20%
1175
June11th to 20thNight
72%
540
11%
1620
9%
540
73%
540
25%
1100
June21st to endNight
75%
540
8%
1620
8%
540
76%
540
23%
1158
July1st to 10thNight
73%
525
6%
1575
6%
525
73%
525
23%
1120
July11th to 20thNight
79%
522
5%
1566
6%
522
79%
522
26%
1087
July21st to endNight
79%
591
8%
1672
7%
558
79%
558
26%
1156
August1st to 10thNight
74%
537
5%
1600
6%
534
74%
534
25%
1115
August11th to 20thNight
76%
642
5%
1822
5%
642
76%
642
23%
1279
August21st to endNight
60%
792
5%
2178
5%
792
61%
792
19%
1594
September1st to 10thNight
74%
720
6%
1980
6%
720
74%
720
24%
1370
September11th to 20thNight
65%
720
6%
1980
6%
720
65%
720
20%
1451
September21st to endNight
58%
720
9%
1980
8%
720
60%
720
18%
1476
October1st to 10thNight
61%
720
16%
1993
16%
720
63%
720
26%
1338
October11th to 20thNight
65%
720
23%
2160
23%
720
69%
720
32%
1323
October21st to endNight
59%
792
24%
2376
23%
792
63%
792
31%
1475
November1st to 10thNight
58%
740
28%
2221
24%
740
66%
740
37%
1277
November11th to 20thNight
56%
760
28%
2280
24%
760
64%
760
32%
1386
November21st to endNight
56%
760
28%
2280
24%
760
62%
760
34%
1349
December1st to 10thNight
61%
760
28%
2418
24%
760
68%
760
36%
1334
December11th to 20thNight
56%
760
27%
2919
24%
758
61%
758
30%
1549
December21st to endNight
56%
828
15%
4472
23%
817
64%
817
19%
2615

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%37%7%5%7%7%7%9%36%
79131
Night
7%5%36%6%45%6%7%10%42%
80739
TransparencyDay
43%6%15%19%13%4
78854
Night
37%6%18%21%15%4
80535
SeeingDay
7%5%17%26%25%20%
14885
Night
8%417%33%28%11%
25063

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%8%36%6%345%6%9%40%
2836
11th to 20thDay
16%7%47%6%45%6%6%9%31%
2840
21st to endDay
7%6%37%7%45%5%6%7%42%
3330
February1st to 10thDay
8%5%36%5%45%5%6%8%44%
1900
11th to 20thDay
6%3144345%5%8%56%
1866
21st to endDay
43246%36%5%6%9%51%
1727
March1st to 10thDay
3225%6%35%5%7%10%53%
2090
11th to 20thDay
6%425%6%35%5%6%9%50%
2090
21st to endDay
5%4246%35%6%6%8%52%
2200
April1st to 10thDay
4325%6%36%5%7%10%50%
1980
11th to 20thDay
6%426%7%46%7%7%9%41%
1964
21st to endDay
6%426%5%46%6%6%8%48%
2160
May1st to 10thDay
42235%46%6%6%10%53%
2160
11th to 20thDay
7%6%36%7%5%6%7%7%9%36%
2281
21st to endDay
10%6%38%8%5%7%6%6%9%31%
2531
June1st to 10thDay
13%8%410%9%6%10%8%8%8%17%
2340
11th to 20thDay
8%6%49%9%6%9%8%9%10%21%
2340
21st to endDay
8%7%49%9%6%9%8%9%10%21%
2340
July1st to 10thDay
6%7%49%11%6%9%9%9%10%21%
2340
11th to 20thDay
7%5%310%10%6%9%9%8%11%21%
2340
21st to endDay
7%5%38%10%7%9%9%9%10%22%
2547
August1st to 10thDay
5%5%39%10%6%9%9%9%11%23%
2327
11th to 20thDay
5%5%38%9%6%10%10%9%11%23%
2050
21st to endDay
8%7%410%11%5%9%9%9%9%19%
2178
September1st to 10thDay
7%6%39%10%7%9%8%9%9%24%
1980
11th to 20thDay
8%6%310%10%7%8%8%9%8%22%
1980
21st to endDay
11%7%410%10%6%8%7%8%8%21%
1980
October1st to 10thDay
7%5%38%9%5%8%7%7%10%30%
1963
11th to 20thDay
7%6%37%8%5%7%7%7%8%35%
1800
21st to endDay
9%6%36%6%45%5%7%8%41%
1980
November1st to 10thDay
6%5%35%6%46%6%6%9%46%
1857
11th to 20thDay
8%5%27%7%46%6%7%8%41%
1900
21st to endDay
6%435%6%45%5%7%8%46%
1900
December1st to 10thDay
8%5%346%35%5%5%8%48%
1757
11th to 20thDay
8%6%35%5%345%7%9%45%
2153
21st to endDay
10%5%36%7%46%7%7%10%34%
3124
January1st to 10thNight
9%6%36%6%45%5%7%10%39%
4109
11th to 20thNight
16%10%47%6%45%6%5%7%29%
4120
21st to endNight
7%6%37%7%45%6%6%9%42%
4308
February1st to 10thNight
8%6%25%5%345%5%8%48%
2280
11th to 20thNight
7%423425%45%9%55%
2199
21st to endNight
42243245%48%61%
1727
March1st to 10thNight
432442446%8%60%
2090
11th to 20thNight
6%31443447%8%55%
2090
21st to endNight
43234245%5%9%58%
2201
April1st to 10thNight
32135%345%6%9%56%
1980
11th to 20thNight
5%3144345%7%10%53%
1943
21st to endNight
6%4244345%5%8%55%
1800
May1st to 10thNight
331342446%10%62%
1800
11th to 20thNight
6%3346%45%6%9%10%45%
1624
21st to endNight
6%5%35%5%35%5%8%11%43%
1744
June1st to 10thNight
13%8%37%7%47%6%7%11%28%
1620
11th to 20thNight
7%5%35%7%47%7%9%12%34%
1620
21st to endNight
5%6%48%7%5%8%7%8%14%30%
1620
July1st to 10thNight
5%428%9%5%6%7%9%12%33%
1620
11th to 20thNight
36%35%7%5%8%9%11%12%30%
1620
21st to endNight
4427%6%5%7%9%9%12%34%
1771
August1st to 10thNight
5%5%37%8%5%8%7%9%13%30%
1611
11th to 20thNight
5%436%7%5%6%8%10%12%34%
1822
21st to endNight
7%7%48%8%5%6%8%9%11%27%
2178
September1st to 10thNight
6%426%6%48%8%10%14%31%
1980
11th to 20thNight
9%6%37%7%6%6%7%7%11%31%
1980
21st to endNight
8%8%49%8%5%7%7%7%10%27%
1980
October1st to 10thNight
7%6%38%6%47%5%7%10%36%
1993
11th to 20thNight
7%6%35%6%45%5%6%10%44%
2160
21st to endNight
10%5%35%5%445%6%8%44%
2376
November1st to 10thNight
8%425%435%46%9%50%
2221
11th to 20thNight
8%5%35%5%36%5%6%10%45%
2280
21st to endNight
7%6%35%5%345%6%8%48%
2280
December1st to 10thNight
6%425%5%35%6%5%9%50%
2418
11th to 20thNight
11%4344235%6%9%50%
3042
21st to endNight
10%7%36%6%35%6%7%10%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
41%211%24%16%5%
2837
11th to 20thDay
51%313%19%11%4
2840
21st to endDay
43%27%23%19%6%
3330
February1st to 10thDay
37%49%24%20%7%
1900
11th to 20thDay
25%38%26%26%11%
1876
21st to endDay
29%49%19%27%11%
1727
March1st to 10thDay
27%310%28%24%7%
2090
11th to 20thDay
31%311%27%21%7%
2090
21st to endDay
30%39%27%22%9%
2200
April1st to 10thDay
29%315%30%17%5%
1980
11th to 20thDay
37%5%14%24%17%4
1964
21st to endDay
33%312%22%24%6%
2160
May1st to 10thDay
26%412%26%25%7%
2160
11th to 20thDay
44%5%15%22%14%1
2285
21st to endDay
49%5%13%18%13%1
2531
June1st to 10thDay
61%6%17%13%3
2340
11th to 20thDay
54%9%22%13%2
2340
21st to endDay
54%8%25%11%1
2340
July1st to 10thDay
54%11%26%9%
2275
11th to 20thDay
53%9%28%10%
2271
21st to endDay
52%10%27%10%
2405
August1st to 10thDay
50%9%29%11%1
2314
11th to 20thDay
49%11%29%11%
2050
21st to endDay
56%11%23%8%1
2178
September1st to 10thDay
52%11%23%12%1
1980
11th to 20thDay
54%11%21%11%3
1980
21st to endDay
58%8%17%11%5%2
1980
October1st to 10thDay
47%7%15%16%12%4
1963
11th to 20thDay
44%6%12%19%15%4
1800
21st to endDay
39%5%8%19%21%8%
1980
November1st to 10thDay
34%5%10%20%20%11%
1857
11th to 20thDay
39%5%9%22%17%8%
1900
21st to endDay
35%5%11%22%23%5%
1900
December1st to 10thDay
34%312%24%22%4
1757
11th to 20thDay
36%410%21%21%9%
2150
21st to endDay
45%313%20%15%4
3124
January1st to 10thNight
40%213%24%17%4
4109
11th to 20thNight
54%313%18%10%3
4120
21st to endNight
40%39%22%20%5%
4308
February1st to 10thNight
35%311%26%20%6%
2280
11th to 20thNight
27%310%27%23%10%
2200
21st to endNight
22%411%24%31%9%
1727
March1st to 10thNight
24%310%32%25%7%
2090
11th to 20thNight
27%215%31%20%5%
2090
21st to endNight
24%5%10%29%25%6%
2201
April1st to 10thNight
23%418%34%15%5%
1980
11th to 20thNight
26%5%17%26%22%4
1943
21st to endNight
28%412%28%24%5%
1800
May1st to 10thNight
19%314%35%24%5%
1800
11th to 20thNight
33%5%24%22%16%
1625
21st to endNight
34%5%20%24%17%
1745
June1st to 10thNight
50%8%20%19%3
1620
11th to 20thNight
40%11%28%19%3
1620
21st to endNight
43%12%30%13%3
1620
July1st to 10thNight
41%14%34%11%1
1575
11th to 20thNight
40%12%36%12%1
1566
21st to endNight
38%13%35%14%1
1672
August1st to 10thNight
42%10%32%16%
1600
11th to 20thNight
38%15%35%11%
1822
21st to endNight
47%12%30%9%2
2178
September1st to 10thNight
38%14%34%13%1
1980
11th to 20thNight
46%12%26%13%2
1980
21st to endNight
50%11%21%12%5%
1980
October1st to 10thNight
41%8%19%18%10%3
1993
11th to 20thNight
36%5%16%23%18%3
2160
21st to endNight
38%5%10%20%20%7%
2376
November1st to 10thNight
31%5%12%22%22%9%
2221
11th to 20thNight
36%5%8%27%18%6%
2280
21st to endNight
34%5%11%22%23%5%
2280
December1st to 10thNight
30%5%13%29%19%4
2418
11th to 20thNight
32%310%25%21%10%
3044
21st to endNight
43%317%18%16%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
10%10%40%24%16%1
270
11th to 20thDay
10%13%36%30%10%1
270
21st to endDay
10%12%45%25%8%
297
February1st to 10thDay
7%10%32%37%13%1
270
11th to 20thDay
6%7%31%39%14%4
288
21st to endDay
38%26%38%24%3
382
March1st to 10thDay
49%35%35%15%2
460
11th to 20thDay
6%8%30%31%22%3
460
21st to endDay
6%5%27%33%27%4
470
April1st to 10thDay
37%32%34%19%5%
420
11th to 20thDay
6%7%27%32%19%8%
412
21st to endDay
5%5%22%33%27%7%
420
May1st to 10thDay
4117%36%30%11%
423
11th to 20thDay
9%5%16%28%25%17%
447
21st to endDay
10%28%26%31%24%
485
June1st to 10thDay
12%310%25%26%23%
450
11th to 20thDay
9%37%19%26%35%
450
21st to endDay
5%2212%26%52%
450
July1st to 10thDay
4328%29%54%
445
11th to 20thDay
5%1114%34%44%
444
21st to endDay
6%2315%28%46%
488
August1st to 10thDay
6%2213%29%50%
446
11th to 20thDay
41213%29%51%
439
21st to endDay
9%26%19%27%36%
495
September1st to 10thDay
8%35%14%26%44%
450
11th to 20thDay
7%2415%30%42%
450
21st to endDay
10%26%17%33%31%
450
October1st to 10thDay
7%312%35%31%11%
450
11th to 20thDay
7%413%34%29%13%
450
21st to endDay
7%5%20%35%26%7%
495
November1st to 10thDay
9%7%18%33%25%8%
455
11th to 20thDay
10%6%26%28%23%6%
460
21st to endDay
45%28%37%22%4
460
December1st to 10thDay
10%8%27%31%22%3
317
11th to 20thDay
7%11%30%31%16%4
270
21st to endDay
7%8%29%35%17%4
297
January1st to 10thNight
8%5%25%43%18%1
760
11th to 20thNight
9%7%27%41%15%1
760
21st to endNight
8%7%32%40%12%
836
February1st to 10thNight
10%6%29%41%13%1
760
11th to 20thNight
8%5%27%42%17%1
743
21st to endNight
5%423%50%18%
628
March1st to 10thNight
46%31%43%16%1
760
11th to 20thNight
7%5%27%45%15%1
760
21st to endNight
5%5%27%44%17%1
801
April1st to 10thNight
4425%43%23%1
720
11th to 20thNight
6%427%42%20%1
711
21st to endNight
7%324%43%22%1
720
May1st to 10thNight
3218%45%28%4
720
11th to 20thNight
7%111%43%31%6%
563
21st to endNight
7%27%33%43%8%
584
June1st to 10thNight
14%35%22%43%13%
540
11th to 20thNight
7%1313%45%31%
540
21st to endNight
41212%44%36%
540
July1st to 10thNight
4216%44%42%
525
11th to 20thNight
417%44%43%
522
21st to endNight
5%228%37%46%
591
August1st to 10thNight
7%217%44%39%
537
11th to 20thNight
6%128%43%40%
642
21st to endNight
10%26%16%38%27%
792
September1st to 10thNight
7%2413%43%33%
720
11th to 20thNight
11%2415%41%26%
720
21st to endNight
12%35%20%39%22%
720
October1st to 10thNight
10%212%37%31%8%
720
11th to 20thNight
9%412%35%30%11%
720
21st to endNight
12%317%36%27%5%
792
November1st to 10thNight
9%423%36%26%3
740
11th to 20thNight
9%224%39%24%2
760
21st to endNight
9%421%41%23%1
760
December1st to 10thNight
6%422%40%26%2
760
11th to 20thNight
10%421%39%23%3
760
21st to endNight
9%5%23%40%21%2
836
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