Sun City Center
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sun City Center clear sky chart from 2005-11-05 to 2017-09-19.

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
63%
15905
21%
46988
17%
15867
67%
15867
31%
29098

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 15thNight
51%
716
19%
2327
15%
716
57%
716
26%
1431
January16th to endNight
49%
768
25%
2392
19%
768
57%
768
29%
1444
February1st to 15thNight
50%
701
25%
2105
19%
699
57%
699
33%
1260
February16th to endNight
53%
631
25%
1854
17%
631
60%
631
37%
1061
March1st to 15thNight
54%
720
30%
1980
18%
720
64%
720
44%
1105
March16th to endNight
58%
768
27%
2112
21%
768
62%
768
40%
1216
April1st to 15thNight
65%
718
23%
1976
19%
718
68%
718
46%
1087
April16th to endNight
61%
720
27%
1884
19%
720
66%
720
42%
1092
May1st to 15thNight
77%
542
29%
1622
25%
542
80%
542
46%
860
May16th to endNight
78%
561
24%
1683
20%
561
79%
561
38%
991
June1st to 15thNight
73%
540
11%
1620
10%
540
73%
540
26%
1094
June16th to endNight
77%
540
8%
1620
8%
540
77%
540
26%
1123
July1st to 15thNight
77%
510
6%
1530
6%
510
77%
510
22%
1126
July16th to endNight
76%
564
7%
1595
7%
531
77%
531
22%
1130
August1st to 15thNight
80%
539
4%
1675
5%
536
80%
536
27%
1111
August16th to endNight
69%
702
8%
2039
8%
702
69%
702
21%
1467
September1st to 15thNight
67%
720
7%
1980
8%
720
67%
720
19%
1468
September16th to endNight
63%
673
12%
1858
12%
673
64%
673
21%
1342
October1st to 15thNight
71%
660
26%
1846
25%
660
73%
660
37%
1108
October16th to endNight
59%
704
26%
2112
24%
704
64%
704
33%
1258
November1st to 15thNight
65%
700
32%
2101
29%
700
70%
700
40%
1175
November16th to endNight
56%
720
29%
2241
24%
720
64%
720
34%
1305
December1st to 15thNight
57%
720
25%
2340
23%
720
62%
720
29%
1405
December16th to endNight
59%
768
24%
2496
25%
768
63%
768
31%
1439

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%8%37%
47815
Night
6%425%5%35%5%6%9%43%
47194
TransparencyDay
41%7%14%17%13%5%
47516
Night
34%7%17%20%14%5%
46997
SeeingDay
9%210%20%27%30%
5764
Night
8%214%33%29%10%
15915

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 15thDay
10%5%36%6%345%6%9%37%
1611
16th to endDay
10%425%33445%7%47%
1830
February1st to 15thDay
11%6%244235%5%6%46%
1750
16th to endDay
6%425%5%2345%9%49%
1619
March1st to 15thDay
5%2145%245%6%7%53%
1980
16th to endDay
8%324425%45%7%49%
2111
April1st to 15thDay
6%3245%36%5%6%9%45%
1972
16th to endDay
6%324445%5%5%9%48%
2082
May1st to 15thDay
5%3135%35%5%6%8%52%
2331
16th to endDay
6%426%6%5%7%6%8%8%36%
2431
June1st to 15thDay
11%7%36%8%5%6%7%7%10%24%
2340
16th to endDay
7%5%26%8%7%9%9%8%10%23%
2340
July1st to 15thDay
9%5%39%9%7%10%8%8%8%20%
2340
16th to endDay
9%6%38%9%5%8%8%8%10%20%
2465
August1st to 15thDay
6%5%38%10%7%10%8%8%10%21%
2271
16th to endDay
10%6%39%8%5%8%8%8%8%22%
2151
September1st to 15thDay
8%6%39%10%5%8%7%10%9%21%
1980
16th to endDay
8%8%310%9%5%7%6%8%8%22%
1848
October1st to 15thDay
6%5%27%6%45%6%6%9%38%
1782
16th to endDay
9%5%34435%45%7%46%
1760
November1st to 15thDay
5%3245%36%5%5%8%49%
1757
16th to endDay
8%425%5%3445%7%47%
1716
December1st to 15thDay
8%6%35%6%35%5%6%7%40%
1620
16th to endDay
7%5%245%25%5%6%9%45%
1728
January1st to 15thNight
8%6%36%6%345%5%9%39%
2327
16th to endNight
11%425%435%5%5%8%42%
2392
February1st to 15thNight
11%5%245%2435%7%47%
2103
16th to endNight
7%42442437%8%49%
1854
March1st to 15thNight
4323425%45%7%55%
1980
16th to endNight
6%315%434447%55%
2112
April1st to 15thNight
5%21342446%10%54%
1976
16th to endNight
5%4135%2445%8%52%
1884
May1st to 15thNight
321332445%9%59%
1622
16th to endNight
4314425%5%6%9%51%
1682
June1st to 15thNight
8%6%25%6%45%6%7%10%35%
1620
16th to endNight
5%425%7%37%7%8%12%34%
1620
July1st to 15thNight
5%5%25%7%38%8%9%12%31%
1620
16th to endNight
35%27%6%5%7%7%11%13%28%
1703
August1st to 15thNight
4325%6%46%8%9%13%34%
1686
16th to endNight
8%425%7%47%8%7%12%31%
2039
September1st to 15thNight
6%5%37%8%47%7%9%13%26%
1980
16th to endNight
7%7%37%7%5%6%7%7%10%29%
1858
October1st to 15thNight
5%415%5%25%47%9%47%
1846
16th to endNight
8%6%2442436%8%47%
2112
November1st to 15thNight
43245%35%45%9%51%
2101
16th to endNight
6%425%5%25%5%6%9%47%
2241
December1st to 15thNight
9%4245%35%5%5%8%45%
2340
16th to endNight
6%4245%45%5%5%8%46%
2496

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 15thDay
41%39%22%18%4
1612
16th to endDay
34%47%21%24%7%
1830
February1st to 15thDay
36%47%17%20%14%
1752
16th to endDay
33%311%17%22%11%
1619
March1st to 15thDay
28%39%27%22%8%
1980
16th to endDay
32%49%22%21%8%
2112
April1st to 15thDay
33%6%12%20%20%7%
1972
16th to endDay
32%5%10%19%24%7%
2082
May1st to 15thDay
28%6%11%24%20%8%
2331
16th to endDay
40%7%12%20%16%1
2435
June1st to 15thDay
52%8%17%17%3
2340
16th to endDay
50%12%20%13%2
2340
July1st to 15thDay
56%13%21%6%1
2201
16th to endDay
53%12%22%10%1
2310
August1st to 15thDay
52%12%26%8%
2258
16th to endDay
53%13%21%11%
2151
September1st to 15thDay
53%12%20%10%2
1980
16th to endDay
55%8%15%13%5%1
1848
October1st to 15thDay
39%7%9%17%17%8%
1782
16th to endDay
36%5%7%16%21%12%
1760
November1st to 15thDay
31%46%24%23%9%
1757
16th to endDay
34%48%19%18%13%
1716
December1st to 15thDay
38%5%12%20%17%6%
1620
16th to endDay
34%412%21%19%6%
1728
January1st to 15thNight
39%411%24%15%4
2327
16th to endNight
37%39%20%20%7%
2392
February1st to 15thNight
35%37%18%22%12%
2112
16th to endNight
30%414%19%22%7%
1854
March1st to 15thNight
26%411%29%20%7%
1980
16th to endNight
29%411%25%21%8%
2112
April1st to 15thNight
24%418%25%20%6%
1976
16th to endNight
28%412%25%23%6%
1884
May1st to 15thNight
22%5%13%30%20%7%
1623
16th to endNight
28%7%19%25%17%1
1684
June1st to 15thNight
41%8%25%18%6%
1620
16th to endNight
38%13%27%16%4
1620
July1st to 15thNight
41%15%31%8%1
1530
16th to endNight
38%16%32%12%
1595
August1st to 15thNight
33%14%40%10%
1675
16th to endNight
42%13%28%13%1
2039
September1st to 15thNight
44%15%23%14%1
1980
16th to endNight
46%10%20%15%42
1858
October1st to 15thNight
31%5%15%19%19%7%
1846
16th to endNight
34%49%17%23%9%
2112
November1st to 15thNight
29%39%23%23%9%
2101
16th to endNight
33%49%23%16%12%
2241
December1st to 15thNight
37%5%12%23%16%5%
2340
16th to endNight
33%5%13%21%18%7%
2496

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 15thDay
24%5%23%24%17%4
90
16th to endDay
9%16%30%27%13%3
96
February1st to 15thDay
11%7%25%32%16%6%
90
16th to endDay
10%133%35%19%
120
March1st to 15thDay
4331%35%21%3
270
16th to endDay
9%5%19%34%25%6%
288
April1st to 15thDay
7%418%31%29%8%
270
16th to endDay
8%211%28%34%15%
270
May1st to 15thDay
7%29%25%32%21%
288
16th to endDay
6%1417%32%37%
331
June1st to 15thDay
19%1210%23%41%
315
16th to endDay
6%16%26%57%
315
July1st to 15thDay
7%2316%70%
305
16th to endDay
12%17%18%59%
326
August1st to 15thDay
8%116%20%61%
313
16th to endDay
9%226%25%52%
332
September1st to 15thDay
11%139%26%48%
315
16th to endDay
7%1112%38%39%
266
October1st to 15thDay
5%17%27%43%16%
255
16th to endDay
10%113%30%32%10%
272
November1st to 15thDay
7%212%31%34%11%
265
16th to endDay
8%121%37%25%5%
186
December1st to 15thDay
8%234%38%14%1
90
16th to endDay
6%413%30%41%4
96
January1st to 15thNight
11%6%22%39%19%1
720
16th to endNight
12%5%26%39%15%
768
February1st to 15thNight
13%425%42%13%
704
16th to endNight
8%324%46%15%
631
March1st to 15thNight
6%329%44%15%
720
16th to endNight
6%324%43%20%1
768
April1st to 15thNight
5%320%46%22%1
718
16th to endNight
7%320%43%24%
720
May1st to 15thNight
410%46%35%2
543
16th to endNight
417%39%39%9%
563
June1st to 15thNight
10%1219%48%17%
540
16th to endNight
5%111%42%37%
540
July1st to 15thNight
7%445%41%
510
16th to endNight
415%45%42%
564
August1st to 15thNight
5%5%47%41%
539
16th to endNight
10%214%40%31%
702
September1st to 15thNight
8%2317%44%23%
720
16th to endNight
12%3125%41%16%
673
October1st to 15thNight
7%15%40%38%6%
660
16th to endNight
11%117%33%32%3
704
November1st to 15thNight
6%217%45%24%3
700
16th to endNight
8%324%42%19%2
720
December1st to 15thNight
10%219%42%23%
720
16th to endNight
8%419%42%22%1
768
Page generated at 2017-09-20 04:49:58. Version ac04

Copyright 2017 A. Danko


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