Brooksville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Brooksville 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
53%
24389
21%
74491
15%
24334
60%
24334
29%
45886

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
36%
758
23%
2459
14%
757
49%
757
27%
1470
January11th to 20thNight
45%
729
27%
2367
19%
729
57%
729
30%
1359
January21st to endNight
31%
792
23%
2448
13%
792
43%
792
25%
1533
February1st to 10thNight
39%
720
23%
2160
16%
720
48%
720
29%
1335
February11th to 20thNight
40%
700
24%
2099
13%
700
52%
700
32%
1213
February21st to endNight
37%
592
27%
1732
14%
592
49%
592
31%
1060
March1st to 10thNight
41%
720
30%
1980
16%
720
53%
720
42%
1100
March11th to 20thNight
44%
720
28%
1980
17%
720
53%
720
36%
1167
March21st to endNight
42%
792
29%
2178
17%
792
52%
792
39%
1235
April1st to 10thNight
41%
720
24%
1980
15%
720
49%
720
40%
1134
April11th to 20thNight
42%
711
22%
1953
13%
711
50%
711
37%
1145
April21st to endNight
51%
684
30%
1782
18%
684
58%
684
45%
1015
May1st to 10thNight
66%
540
30%
1620
22%
540
71%
540
49%
803
May11th to 20thNight
62%
531
18%
1592
12%
531
68%
531
35%
943
May21st to endNight
70%
582
24%
1744
18%
582
72%
582
37%
1003
June1st to 10thNight
64%
540
15%
1620
12%
540
65%
540
27%
1072
June11th to 20thNight
75%
540
13%
1620
11%
540
76%
540
31%
1013
June21st to endNight
70%
540
9%
1620
8%
540
71%
540
24%
1121
July1st to 10thNight
74%
525
6%
1575
5%
525
74%
525
22%
1121
July11th to 20thNight
76%
522
4%
1566
4%
522
76%
522
21%
1138
July21st to endNight
73%
591
8%
1672
8%
558
75%
558
22%
1191
August1st to 10thNight
76%
537
6%
1600
6%
534
76%
534
26%
1083
August11th to 20thNight
76%
534
7%
1749
8%
534
76%
534
21%
1207
August21st to endNight
62%
764
9%
2150
9%
764
63%
764
20%
1551
September1st to 10thNight
66%
720
9%
1980
8%
720
67%
720
20%
1435
September11th to 20thNight
59%
720
10%
1980
9%
720
60%
720
21%
1426
September21st to endNight
60%
720
20%
1980
17%
720
62%
720
25%
1354
October1st to 10thNight
53%
720
22%
1980
17%
720
59%
720
28%
1303
October11th to 20thNight
62%
720
32%
2128
29%
720
69%
720
43%
1151
October21st to endNight
54%
792
28%
2376
23%
792
62%
792
35%
1377
November1st to 10thNight
48%
740
28%
2221
20%
740
60%
740
38%
1229
November11th to 20thNight
46%
760
30%
2280
22%
760
56%
760
32%
1351
November21st to endNight
45%
760
26%
2451
21%
760
56%
760
31%
1436
December1st to 10thNight
47%
760
28%
2470
19%
760
59%
760
32%
1395
December11th to 20thNight
47%
760
25%
2938
21%
758
55%
758
26%
1664
December21st to endNight
43%
833
16%
4461
21%
817
52%
817
15%
2753

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%5%36%7%46%6%7%9%39%
74856
Night
9%5%25%5%35%5%6%9%44%
74874
TransparencyDay
41%6%14%18%14%6%
74579
Night
36%6%16%21%15%6%
74670
SeeingDay
9%7%21%27%21%14%
14298
Night
10%6%22%32%23%7%
24399

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%6%25%5%35%5%5%10%44%
1706
11th to 20thDay
8%5%245%245%6%9%49%
1638
21st to endDay
11%7%36%4345%6%7%45%
1904
February1st to 10thDay
14%6%35%5%345%5%7%43%
1800
11th to 20thDay
9%43443445%6%54%
1748
21st to endDay
9%436%5%35%5%5%8%48%
1522
March1st to 10thDay
5%3144345%5%8%57%
1980
11th to 20thDay
8%5%25%5%3445%8%51%
1980
21st to endDay
7%4245%35%5%46%53%
2178
April1st to 10thDay
8%3245%36%5%6%9%50%
1980
11th to 20thDay
9%436%7%36%6%5%8%43%
1956
21st to endDay
6%2245%35%5%5%9%54%
2186
May1st to 10thDay
5%313335%5%6%8%57%
2340
11th to 20thDay
8%425%7%5%7%6%6%9%41%
2301
21st to endDay
6%436%6%47%7%7%9%40%
2531
June1st to 10thDay
12%7%47%7%6%7%7%7%10%26%
2340
11th to 20thDay
6%5%37%8%6%9%8%9%11%28%
2340
21st to endDay
9%5%48%7%6%8%8%8%10%28%
2340
July1st to 10thDay
10%5%38%10%5%9%9%9%11%22%
2340
11th to 20thDay
8%6%49%10%5%9%8%8%11%22%
2340
21st to endDay
7%7%38%9%6%9%9%9%10%23%
2547
August1st to 10thDay
8%6%37%9%5%7%8%9%11%26%
2327
11th to 20thDay
7%6%38%9%7%10%8%9%11%21%
2148
21st to endDay
10%6%48%9%5%7%8%9%10%23%
2185
September1st to 10thDay
8%6%48%9%6%9%9%8%9%23%
1980
11th to 20thDay
10%7%38%9%49%7%7%9%27%
1980
21st to endDay
8%6%37%8%5%8%7%7%8%33%
1980
October1st to 10thDay
10%6%38%7%46%6%5%7%38%
1980
11th to 20thDay
7%425%5%45%46%7%51%
1830
21st to endDay
8%435%436%5%5%9%50%
1980
November1st to 10thDay
8%5%26%5%45%45%7%51%
1857
11th to 20thDay
9%6%25%6%3445%7%47%
1900
21st to endDay
9%6%26%5%45%5%6%9%43%
1725
December1st to 10thDay
8%435%5%345%7%8%48%
1710
11th to 20thDay
11%6%35%6%3445%8%45%
2153
21st to endDay
13%8%37%6%45%6%6%6%36%
3124
January1st to 10thNight
11%6%25%435%46%9%44%
2459
11th to 20thNight
9%5%345%35%5%6%9%47%
2367
21st to endNight
15%5%27%5%3445%7%43%
2448
February1st to 10thNight
12%6%35%5%35%45%6%46%
2160
11th to 20thNight
9%5%244345%6%8%50%
2098
21st to endNight
8%7%36%5%345%5%8%46%
1732
March1st to 10thNight
6%42443445%7%58%
1980
11th to 20thNight
8%4245%3446%8%51%
1980
21st to endNight
7%5%25%42346%7%56%
2178
April1st to 10thNight
7%42442346%9%53%
1980
11th to 20thNight
8%6%144345%5%9%50%
1953
21st to endNight
7%3144345%5%8%57%
1782
May1st to 10thNight
431332445%9%62%
1620
11th to 20thNight
6%5%15%5%36%5%6%9%49%
1592
21st to endNight
6%425%445%46%9%51%
1744
June1st to 10thNight
10%5%36%5%46%6%8%10%36%
1620
11th to 20thNight
5%435%5%37%8%9%14%38%
1620
21st to endNight
7%437%7%46%8%9%12%33%
1620
July1st to 10thNight
6%5%36%6%48%8%8%13%33%
1620
11th to 20thNight
45%37%8%5%8%8%10%13%29%
1620
21st to endNight
5%5%26%7%5%9%8%9%13%32%
1771
August1st to 10thNight
5%5%26%7%47%7%11%13%34%
1611
11th to 20thNight
5%5%26%6%47%9%10%14%31%
1749
21st to endNight
10%7%37%6%46%7%9%11%30%
2150
September1st to 10thNight
6%5%37%8%5%7%9%8%12%30%
1980
11th to 20thNight
10%7%37%8%47%5%9%11%29%
1980
21st to endNight
8%6%37%7%46%7%7%9%36%
1980
October1st to 10thNight
9%6%35%7%45%5%6%9%42%
1980
11th to 20thNight
6%5%1343346%8%56%
2128
21st to endNight
9%6%25%5%3345%7%51%
2376
November1st to 10thNight
8%425%43436%8%54%
2221
11th to 20thNight
8%7%25%5%3445%6%50%
2280
21st to endNight
9%5%36%6%35%46%8%46%
2451
December1st to 10thNight
8%425%5%35%45%8%49%
2470
11th to 20thNight
12%6%35%43345%7%48%
3042
21st to endNight
16%8%36%6%345%6%8%35%
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
37%49%22%19%10%
1707
11th to 20thDay
33%36%25%23%9%
1638
21st to endDay
38%48%17%23%10%
1904
February1st to 10thDay
40%5%10%15%18%13%
1800
11th to 20thDay
32%47%20%25%12%
1758
21st to endDay
35%5%9%18%22%10%
1522
March1st to 10thDay
25%5%10%25%26%10%
1980
11th to 20thDay
32%412%25%16%11%
1980
21st to endDay
33%49%24%22%8%
2178
April1st to 10thDay
31%5%14%20%21%9%
1980
11th to 20thDay
39%49%19%22%7%
1956
21st to endDay
27%411%25%24%8%
2186
May1st to 10thDay
25%412%24%24%10%
2340
11th to 20thDay
39%5%15%23%15%4
2305
21st to endDay
39%6%14%20%18%3
2531
June1st to 10thDay
52%7%18%17%5%
2340
11th to 20thDay
46%9%22%19%3
2340
21st to endDay
48%9%23%15%4
2340
July1st to 10thDay
53%11%23%10%1
2275
11th to 20thDay
53%11%26%9%1
2271
21st to endDay
51%11%25%11%1
2405
August1st to 10thDay
47%11%29%11%1
2314
11th to 20thDay
52%13%24%11%1
2148
21st to endDay
53%11%20%13%2
2185
September1st to 10thDay
53%12%19%12%4
1980
11th to 20thDay
53%8%21%14%4
1980
21st to endDay
47%8%14%17%10%4
1980
October1st to 10thDay
45%6%9%18%13%9%
1980
11th to 20thDay
33%49%24%24%7%
1830
21st to endDay
31%5%9%20%23%12%
1980
November1st to 10thDay
34%5%9%21%18%13%
1857
11th to 20thDay
37%49%19%21%10%
1900
21st to endDay
37%48%22%22%7%
1725
December1st to 10thDay
33%414%26%17%6%
1710
11th to 20thDay
39%29%19%17%13%
2150
21st to endDay
47%49%20%15%5%
3124
January1st to 10thNight
37%411%19%19%10%
2459
11th to 20thNight
34%410%22%23%8%
2367
21st to endNight
41%49%17%20%9%
2448
February1st to 10thNight
38%410%17%19%12%
2160
11th to 20thNight
32%410%20%23%10%
2099
21st to endNight
36%411%20%22%7%
1732
March1st to 10thNight
26%412%25%24%9%
1980
11th to 20thNight
31%5%13%27%14%10%
1980
21st to endNight
28%410%30%21%7%
2178
April1st to 10thNight
27%6%19%23%18%7%
1980
11th to 20thNight
31%413%27%19%5%
1953
21st to endNight
26%414%26%23%6%
1782
May1st to 10thNight
21%414%30%22%9%
1620
11th to 20thNight
32%6%22%23%15%2
1593
21st to endNight
30%6%17%24%20%2
1745
June1st to 10thNight
42%6%24%22%6%
1620
11th to 20thNight
34%9%31%23%3
1620
21st to endNight
40%12%27%16%5%
1620
July1st to 10thNight
41%14%32%10%2
1575
11th to 20thNight
41%17%32%10%1
1566
21st to endNight
39%16%31%12%1
1672
August1st to 10thNight
37%13%37%12%1
1600
11th to 20thNight
38%16%32%13%1
1749
21st to endNight
46%11%25%16%2
2150
September1st to 10thNight
43%14%24%14%4
1980
11th to 20thNight
47%10%22%17%31
1980
21st to endNight
42%9%17%19%11%2
1980
October1st to 10thNight
39%8%12%21%14%8%
1980
11th to 20thNight
26%412%28%24%5%
2128
21st to endNight
33%410%19%23%11%
2376
November1st to 10thNight
30%411%23%21%12%
2221
11th to 20thNight
36%39%22%20%10%
2280
21st to endNight
36%310%24%19%8%
2451
December1st to 10thNight
34%312%29%16%6%
2470
11th to 20thNight
36%410%19%19%12%
3044
21st to endNight
47%312%19%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
11%16%46%20%6%
270
11th to 20thDay
11%13%39%25%10%2
246
21st to endDay
15%23%42%19%2
264
February1st to 10thDay
13%18%35%27%7%1
240
11th to 20thDay
14%10%38%28%8%2
240
21st to endDay
8%16%32%31%12%
240
March1st to 10thDay
5%17%38%28%10%1
420
11th to 20thDay
12%14%30%27%15%2
420
21st to endDay
8%13%33%30%14%3
462
April1st to 10thDay
11%13%30%28%15%2
420
11th to 20thDay
10%13%33%27%15%3
412
21st to endDay
6%7%29%32%20%6%
420
May1st to 10thDay
6%8%26%31%20%9%
423
11th to 20thDay
9%418%33%21%14%
447
21st to endDay
8%311%27%32%19%
485
June1st to 10thDay
13%312%27%27%18%
450
11th to 20thDay
6%49%27%28%26%
450
21st to endDay
6%27%20%32%33%
450
July1st to 10thDay
7%2218%28%42%
445
11th to 20thDay
6%3316%34%38%
444
21st to endDay
8%27%22%28%34%
488
August1st to 10thDay
8%35%18%31%36%
446
11th to 20thDay
6%3315%36%37%
439
21st to endDay
12%26%23%28%28%
495
September1st to 10thDay
8%37%19%34%29%
450
11th to 20thDay
8%48%26%31%22%
450
21st to endDay
9%29%28%33%19%
450
October1st to 10thDay
12%422%34%20%7%
450
11th to 20thDay
6%6%18%37%26%7%
450
21st to endDay
8%5%25%37%21%4
495
November1st to 10thDay
10%7%27%34%17%4
455
11th to 20thDay
14%8%28%36%11%3
460
21st to endDay
10%9%39%29%11%1
285
December1st to 10thDay
7%11%39%29%10%4
270
11th to 20thDay
13%12%37%29%9%1
270
21st to endDay
8%11%37%35%8%2
297
January1st to 10thNight
14%14%32%31%10%
760
11th to 20thNight
12%10%28%39%12%
729
21st to endNight
17%12%34%30%6%
792
February1st to 10thNight
16%10%31%30%13%
720
11th to 20thNight
10%12%33%35%9%2
703
21st to endNight
11%10%34%37%7%
592
March1st to 10thNight
7%11%38%33%10%
720
11th to 20thNight
10%9%31%35%13%1
720
21st to endNight
9%9%35%35%12%
792
April1st to 10thNight
8%9%37%34%12%1
720
11th to 20thNight
10%9%34%34%12%1
711
21st to endNight
7%6%31%38%18%1
684
May1st to 10thNight
6%321%43%24%2
540
11th to 20thNight
8%219%41%26%4
531
21st to endNight
7%312%37%35%7%
584
June1st to 10thNight
12%211%32%35%8%
540
11th to 20thNight
7%16%26%39%21%
540
21st to endNight
8%25%19%44%23%
540
July1st to 10thNight
8%2216%44%29%
525
11th to 20thNight
5%2215%48%29%
522
21st to endNight
5%2314%52%25%
591
August1st to 10thNight
7%1213%50%26%
537
11th to 20thNight
6%3112%44%34%
534
21st to endNight
12%27%23%36%20%
764
September1st to 10thNight
8%28%24%39%18%
720
11th to 20thNight
12%310%29%35%12%
720
21st to endNight
9%213%30%39%7%
720
October1st to 10thNight
11%321%40%21%3
720
11th to 20thNight
6%421%38%29%2
720
21st to endNight
12%5%23%37%20%2
792
November1st to 10thNight
10%5%30%34%18%3
740
11th to 20thNight
11%7%29%37%15%2
760
21st to endNight
10%7%31%39%12%1
760
December1st to 10thNight
10%6%30%33%19%1
760
11th to 20thNight
11%9%26%38%15%1
760
21st to endNight
13%9%29%34%13%1
836
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