Carrollwood
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carrollwood clear sky chart from 2005-11-06 to 2024-01-16.

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
60%
24402
20%
74574
17%
24349
65%
24349
29%
46805

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
44%
758
22%
2459
16%
757
53%
757
27%
1492
January11th to 20thNight
51%
744
25%
2417
20%
744
59%
744
29%
1402
January21st to endNight
40%
792
23%
2416
15%
792
49%
792
26%
1548
February1st to 10thNight
46%
720
22%
2160
16%
720
52%
720
30%
1335
February11th to 20thNight
50%
700
23%
2099
16%
700
58%
700
36%
1196
February21st to endNight
52%
592
26%
1736
17%
592
59%
592
33%
1054
March1st to 10thNight
49%
720
30%
1980
19%
720
59%
720
43%
1102
March11th to 20thNight
53%
720
28%
1980
18%
720
60%
720
38%
1161
March21st to endNight
54%
792
30%
2178
21%
792
61%
792
42%
1238
April1st to 10thNight
56%
720
23%
1980
17%
720
60%
720
40%
1130
April11th to 20thNight
52%
711
20%
1953
14%
711
57%
711
36%
1179
April21st to endNight
61%
684
30%
1805
21%
684
65%
684
44%
1039
May1st to 10thNight
76%
540
31%
1620
26%
540
78%
540
52%
789
May11th to 20thNight
68%
531
17%
1592
12%
531
72%
531
32%
987
May21st to endNight
76%
582
23%
1745
20%
582
77%
582
39%
1008
June1st to 10thNight
69%
540
15%
1620
13%
540
69%
540
24%
1115
June11th to 20thNight
80%
540
13%
1620
12%
540
80%
540
28%
1055
June21st to endNight
76%
540
10%
1620
9%
540
76%
540
23%
1149
July1st to 10thNight
75%
525
6%
1575
6%
525
75%
525
20%
1164
July11th to 20thNight
78%
522
4%
1566
3%
522
78%
522
20%
1180
July21st to endNight
76%
591
8%
1672
8%
558
77%
558
20%
1198
August1st to 10thNight
81%
537
4%
1613
5%
534
81%
534
24%
1137
August11th to 20thNight
76%
534
6%
1776
8%
534
76%
534
20%
1257
August21st to endNight
64%
764
8%
2150
9%
764
64%
764
18%
1608
September1st to 10thNight
68%
720
7%
1980
6%
720
68%
720
19%
1466
September11th to 20thNight
63%
720
9%
1980
9%
720
63%
720
19%
1469
September21st to endNight
63%
720
18%
1980
16%
720
65%
720
24%
1381
October1st to 10thNight
62%
720
21%
1980
19%
720
64%
720
28%
1311
October11th to 20thNight
68%
720
28%
2112
28%
720
72%
720
37%
1228
October21st to endNight
61%
792
26%
2376
24%
792
67%
792
36%
1376
November1st to 10thNight
59%
740
26%
2221
22%
740
66%
740
37%
1261
November11th to 20thNight
55%
760
29%
2280
24%
760
63%
760
32%
1358
November21st to endNight
52%
760
26%
2446
22%
760
60%
760
31%
1444
December1st to 10thNight
54%
760
27%
2470
23%
760
64%
760
33%
1424
December11th to 20thNight
53%
759
24%
2945
22%
758
58%
758
24%
1708
December21st to endNight
52%
832
15%
4472
22%
817
58%
817
15%
2856

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%36%6%46%6%7%9%40%
74874
Night
8%5%25%5%35%5%7%10%44%
74938
TransparencyDay
38%10%15%18%14%5%
74597
Night
34%10%17%19%15%5%
74734
SeeingDay
8%5%18%26%25%19%
14308
Night
9%419%34%27%9%
24414

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%5%35%4245%7%10%44%
1706
11th to 20thDay
9%434435%5%6%10%48%
1671
21st to endDay
12%5%35%4245%6%7%46%
1935
February1st to 10thDay
13%425%5%35%6%5%7%45%
1800
11th to 20thDay
8%5%13425%45%6%56%
1748
21st to endDay
7%5%344235%6%9%52%
1517
March1st to 10thDay
332343446%9%58%
1980
11th to 20thDay
7%3244345%5%7%54%
1980
21st to endDay
7%425%43346%8%54%
2178
April1st to 10thDay
7%324435%47%10%51%
1980
11th to 20thDay
8%5%26%6%45%6%7%9%43%
1956
21st to endDay
5%32444446%9%55%
2164
May1st to 10thDay
5%21342445%8%61%
2340
11th to 20thDay
7%426%7%37%6%8%9%42%
2301
21st to endDay
6%435%7%5%7%6%8%10%39%
2531
June1st to 10thDay
11%6%37%8%5%7%8%8%11%26%
2340
11th to 20thDay
5%5%36%7%5%10%9%10%11%29%
2340
21st to endDay
7%6%37%7%5%8%9%9%12%28%
2340
July1st to 10thDay
7%5%47%8%5%9%9%10%12%24%
2340
11th to 20thDay
6%6%38%9%7%10%9%9%11%23%
2340
21st to endDay
7%6%38%9%6%9%9%9%11%23%
2547
August1st to 10thDay
7%5%37%9%6%9%9%9%11%25%
2308
11th to 20thDay
7%6%39%8%6%9%9%10%12%22%
2125
21st to endDay
9%6%38%9%6%8%8%9%10%24%
2188
September1st to 10thDay
7%6%38%9%6%8%8%9%12%23%
1980
11th to 20thDay
11%6%38%7%47%7%8%10%27%
1980
21st to endDay
7%7%38%7%5%6%8%9%10%31%
1980
October1st to 10thDay
8%6%37%7%5%6%7%7%8%37%
1980
11th to 20thDay
6%425%436%6%5%9%50%
1846
21st to endDay
7%5%245%345%6%9%50%
1980
November1st to 10thDay
8%5%25%5%25%5%6%9%50%
1857
11th to 20thDay
9%5%36%435%5%5%9%47%
1900
21st to endDay
9%425%5%45%5%6%10%45%
1729
December1st to 10thDay
6%5%345%35%6%6%10%47%
1710
11th to 20thDay
11%6%25%5%4445%8%45%
2153
21st to endDay
13%9%37%7%46%5%5%7%35%
3124
January1st to 10thNight
9%7%35%5%35%46%8%44%
2459
11th to 20thNight
10%5%35%5%3445%9%46%
2417
21st to endNight
12%6%36%5%35%5%47%43%
2416
February1st to 10thNight
11%7%25%5%245%5%7%47%
2160
11th to 20thNight
7%6%245%335%5%8%52%
2098
21st to endNight
8%5%36%6%25%45%8%48%
1736
March1st to 10thNight
5%42443445%7%58%
1980
11th to 20thNight
7%4245%345%6%9%51%
1980
21st to endNight
6%324435%449%56%
2178
April1st to 10thNight
6%31442447%10%54%
1980
11th to 20thNight
7%5%25%5%35%5%7%9%48%
1953
21st to endNight
7%32442435%7%59%
1805
May1st to 10thNight
32133145%6%9%64%
1620
11th to 20thNight
6%5%245%45%6%6%10%47%
1592
21st to endNight
5%424435%5%7%9%53%
1744
June1st to 10thNight
10%6%26%5%45%6%6%11%38%
1620
11th to 20thNight
5%425%5%45%6%9%14%40%
1620
21st to endNight
6%5%35%6%5%7%7%9%13%34%
1620
July1st to 10thNight
6%5%26%6%37%8%10%15%32%
1620
11th to 20thNight
45%25%8%48%8%11%12%31%
1620
21st to endNight
5%435%8%5%8%7%10%13%31%
1771
August1st to 10thNight
5%335%5%47%8%11%14%35%
1624
11th to 20thNight
5%6%26%6%48%9%9%14%31%
1776
21st to endNight
10%6%37%7%46%7%9%12%29%
2150
September1st to 10thNight
6%427%8%6%8%8%8%14%29%
1980
11th to 20thNight
9%6%38%9%46%7%8%10%30%
1980
21st to endNight
8%7%28%7%46%6%7%10%36%
1980
October1st to 10thNight
8%6%35%5%447%8%9%42%
1980
11th to 20thNight
7%4244345%6%7%53%
2112
21st to endNight
8%5%25%5%3345%8%50%
2376
November1st to 10thNight
8%424435%45%8%54%
2221
11th to 20thNight
9%5%35%5%34447%50%
2280
21st to endNight
7%5%36%6%345%6%9%46%
2446
December1st to 10thNight
8%5%245%345%5%9%49%
2470
11th to 20thNight
11%5%35%5%43448%47%
3042
21st to endNight
15%8%36%6%35%5%6%9%34%
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
35%7%11%22%18%7%
1707
11th to 20thDay
31%5%10%25%20%9%
1671
21st to endDay
37%5%8%16%25%8%
1935
February1st to 10thDay
37%6%9%19%18%11%
1800
11th to 20thDay
28%5%10%19%27%11%
1758
21st to endDay
31%5%13%17%23%10%
1517
March1st to 10thDay
23%6%12%24%24%10%
1980
11th to 20thDay
28%6%12%26%19%9%
1980
21st to endDay
29%5%11%25%23%8%
2178
April1st to 10thDay
29%7%17%21%19%8%
1980
11th to 20thDay
36%8%12%16%21%7%
1956
21st to endDay
26%6%13%24%25%7%
2164
May1st to 10thDay
21%7%13%25%24%10%
2340
11th to 20thDay
37%9%17%19%16%3
2305
21st to endDay
37%10%14%20%16%3
2531
June1st to 10thDay
49%12%17%16%5%
2340
11th to 20thDay
42%16%21%17%4
2340
21st to endDay
45%16%22%13%3
2340
July1st to 10thDay
48%19%24%8%1
2275
11th to 20thDay
51%18%22%9%1
2271
21st to endDay
48%18%22%12%1
2405
August1st to 10thDay
47%18%25%10%
2295
11th to 20thDay
50%18%21%10%1
2125
21st to endDay
50%18%19%11%1
2188
September1st to 10thDay
48%18%20%12%2
1980
11th to 20thDay
47%16%21%13%4
1980
21st to endDay
43%12%14%19%9%3
1980
October1st to 10thDay
41%10%12%17%11%9%
1980
11th to 20thDay
32%7%10%21%23%6%
1846
21st to endDay
30%7%12%18%21%12%
1980
November1st to 10thDay
31%7%11%21%19%11%
1857
11th to 20thDay
35%8%10%18%21%9%
1900
21st to endDay
34%7%11%21%20%8%
1729
December1st to 10thDay
31%7%14%26%16%5%
1710
11th to 20thDay
36%6%10%17%18%12%
2150
21st to endDay
47%6%11%17%14%5%
3124
January1st to 10thNight
37%6%12%19%19%7%
2459
11th to 20thNight
35%6%10%22%21%7%
2417
21st to endNight
41%5%10%17%19%8%
2416
February1st to 10thNight
35%7%10%18%19%10%
2160
11th to 20thNight
29%6%12%18%24%10%
2099
21st to endNight
34%5%14%17%22%7%
1736
March1st to 10thNight
25%6%12%27%23%8%
1980
11th to 20thNight
29%6%14%28%16%8%
1980
21st to endNight
26%6%11%29%22%7%
2178
April1st to 10thNight
25%8%20%23%18%6%
1980
11th to 20thNight
31%7%14%22%21%5%
1953
21st to endNight
26%6%12%25%25%6%
1805
May1st to 10thNight
17%6%15%30%23%9%
1620
11th to 20thNight
30%11%21%20%17%1
1593
21st to endNight
26%9%20%23%20%2
1745
June1st to 10thNight
40%12%19%22%7%
1620
11th to 20thNight
33%13%28%21%4
1620
21st to endNight
38%16%24%16%6%
1620
July1st to 10thNight
38%21%30%10%2
1575
11th to 20thNight
39%20%30%9%1
1566
21st to endNight
38%19%31%12%1
1672
August1st to 10thNight
33%20%35%10%1
1613
11th to 20thNight
37%19%30%13%
1776
21st to endNight
45%17%23%13%2
2150
September1st to 10thNight
41%18%26%12%3
1980
11th to 20thNight
45%15%21%15%3
1980
21st to endNight
42%11%18%18%9%3
1980
October1st to 10thNight
35%12%14%18%13%8%
1980
11th to 20thNight
29%7%12%23%24%5%
2112
21st to endNight
31%6%13%18%22%10%
2376
November1st to 10thNight
28%8%13%20%21%12%
2221
11th to 20thNight
33%6%10%20%22%8%
2280
21st to endNight
34%6%11%23%18%8%
2446
December1st to 10thNight
32%6%13%28%16%5%
2470
11th to 20thNight
36%6%10%18%19%10%
3044
21st to endNight
46%7%12%16%15%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%10%43%27%10%
270
11th to 20thDay
8%14%31%33%12%3
257
21st to endDay
18%15%38%22%7%
264
February1st to 10thDay
13%9%32%30%14%3
240
11th to 20thDay
9%9%33%30%15%5%
240
21st to endDay
5%11%31%31%20%2
235
March1st to 10thDay
5%8%38%35%13%1
420
11th to 20thDay
11%7%28%30%21%2
420
21st to endDay
6%6%29%35%21%3
462
April1st to 10thDay
9%9%27%30%22%3
420
11th to 20thDay
8%8%27%30%21%5%
412
21st to endDay
5%5%24%31%27%8%
420
May1st to 10thDay
6%418%33%26%13%
423
11th to 20thDay
9%114%28%31%17%
447
21st to endDay
6%110%23%34%26%
485
June1st to 10thDay
14%28%21%27%27%
450
11th to 20thDay
7%26%22%30%33%
450
21st to endDay
416%16%26%47%
450
July1st to 10thDay
5%2310%26%53%
445
11th to 20thDay
5%1211%30%50%
444
21st to endDay
9%1416%27%44%
488
August1st to 10thDay
8%414%30%44%
446
11th to 20thDay
8%2411%26%49%
439
21st to endDay
9%18%15%31%36%
495
September1st to 10thDay
7%27%15%31%39%
450
11th to 20thDay
11%16%21%34%26%
450
21st to endDay
9%26%23%35%25%
450
October1st to 10thDay
10%216%35%28%9%
450
11th to 20thDay
6%414%33%33%10%
450
21st to endDay
7%418%37%29%5%
495
November1st to 10thDay
10%420%35%25%7%
455
11th to 20thDay
12%7%22%37%18%4
460
21st to endDay
9%7%30%32%19%4
289
December1st to 10thDay
6%10%30%31%16%6%
270
11th to 20thDay
12%7%35%26%17%3
270
21st to endDay
7%11%28%35%16%3
297
January1st to 10thNight
11%7%32%37%13%1
760
11th to 20thNight
11%8%24%42%14%1
744
21st to endNight
14%8%32%37%9%
792
February1st to 10thNight
13%6%30%37%14%
720
11th to 20thNight
9%6%28%40%15%1
703
21st to endNight
9%5%27%46%13%
592
March1st to 10thNight
5%5%36%43%10%1
720
11th to 20thNight
8%6%27%41%17%1
720
21st to endNight
6%6%28%43%16%1
792
April1st to 10thNight
6%6%25%45%18%1
720
11th to 20thNight
8%5%28%43%15%1
711
21st to endNight
8%423%44%21%1
684
May1st to 10thNight
5%112%47%32%3
540
11th to 20thNight
8%113%39%35%4
531
21st to endNight
5%19%35%42%8%
584
June1st to 10thNight
11%28%25%43%11%
540
11th to 20thNight
6%1420%44%25%
540
21st to endNight
7%1216%44%30%
540
July1st to 10thNight
6%126%47%37%
525
11th to 20thNight
7%28%43%41%
522
21st to endNight
4310%47%35%
591
August1st to 10thNight
4148%49%34%
537
11th to 20thNight
6%137%41%42%
534
21st to endNight
11%26%19%40%22%
764
September1st to 10thNight
8%16%19%46%20%
720
11th to 20thNight
11%18%25%43%13%
720
21st to endNight
10%19%30%38%11%
720
October1st to 10thNight
11%316%41%26%4
720
11th to 20thNight
7%315%39%33%3
720
21st to endNight
10%319%39%26%2
792
November1st to 10thNight
9%224%41%21%3
740
11th to 20thNight
10%422%43%19%2
760
21st to endNight
9%427%44%16%1
760
December1st to 10thNight
8%425%39%22%1
760
11th to 20thNight
10%5%26%39%19%1
760
21st to endNight
10%6%26%39%18%1
836
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