Myakka City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Myakka City clear sky chart from 2005-11-05 to 2017-12-02.

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%
16241
21%
47861
18%
16203
67%
16203
32%
29324

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
52%
716
19%
2327
16%
716
58%
716
27%
1417
January16th to endNight
50%
768
26%
2394
20%
768
58%
768
30%
1428
February1st to 15thNight
49%
701
25%
2104
18%
699
56%
699
33%
1253
February16th to endNight
54%
631
28%
1840
19%
631
63%
631
41%
1009
March1st to 15thNight
54%
720
31%
1980
18%
720
64%
720
46%
1072
March16th to endNight
58%
768
28%
2112
21%
768
62%
768
43%
1185
April1st to 15thNight
65%
718
24%
1976
19%
718
68%
718
47%
1055
April16th to endNight
62%
720
28%
1878
20%
720
66%
720
43%
1112
May1st to 15thNight
75%
569
29%
1649
25%
569
78%
569
47%
873
May16th to endNight
77%
561
24%
1683
20%
561
79%
561
38%
985
June1st to 15thNight
71%
540
10%
1620
9%
540
71%
540
25%
1119
June16th to endNight
78%
540
8%
1620
7%
540
79%
540
24%
1121
July1st to 15thNight
73%
510
6%
1530
6%
510
73%
510
21%
1132
July16th to endNight
75%
564
8%
1595
8%
531
76%
531
24%
1127
August1st to 15thNight
81%
539
5%
1669
7%
536
81%
536
27%
1115
August16th to endNight
66%
715
7%
2052
7%
715
66%
715
20%
1473
September1st to 15thNight
66%
720
7%
1980
7%
720
66%
720
20%
1433
September16th to endNight
62%
717
12%
1980
12%
717
63%
717
20%
1432
October1st to 15thNight
69%
720
25%
2021
24%
720
70%
720
35%
1221
October16th to endNight
58%
768
27%
2304
25%
768
64%
768
33%
1381
November1st to 15thNight
65%
760
31%
2281
29%
760
71%
760
41%
1257
November16th to endNight
57%
780
32%
2405
27%
780
65%
780
37%
1348
December1st to 15thNight
56%
728
26%
2365
24%
728
62%
728
31%
1389
December16th to endNight
60%
768
25%
2496
25%
768
63%
768
35%
1387

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%7%46%6%6%8%36%
48568
Night
6%425%5%35%5%6%9%44%
48068
TransparencyDay
42%6%14%17%13%5%
48269
Night
34%6%17%21%15%5%
47871
SeeingDay
9%211%21%25%29%
6088
Night
8%214%33%29%10%
16251

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
9%6%345%45%5%6%9%37%
1611
16th to endDay
9%415%435%5%6%7%45%
1827
February1st to 15thDay
10%5%25%5%25%5%5%5%45%
1750
16th to endDay
7%5%1443445%7%49%
1631
March1st to 15thDay
5%21344446%7%54%
1980
16th to endDay
8%424435%35%8%48%
2111
April1st to 15thDay
5%425%5%36%6%7%9%43%
1972
16th to endDay
6%415%6%35%5%5%8%46%
2080
May1st to 15thDay
5%3145%45%5%5%8%50%
2310
16th to endDay
7%5%36%7%47%6%7%8%35%
2431
June1st to 15thDay
12%8%38%9%5%8%7%7%7%21%
2340
16th to endDay
7%6%38%9%5%9%8%9%7%22%
2340
July1st to 15thDay
9%6%49%11%7%8%8%7%7%19%
2340
16th to endDay
8%6%49%9%6%9%8%8%9%19%
2465
August1st to 15thDay
6%6%29%9%6%9%8%7%9%21%
2277
16th to endDay
10%5%47%10%6%9%7%7%9%21%
2136
September1st to 15thDay
9%6%48%10%6%8%7%8%10%20%
1980
16th to endDay
8%8%410%9%5%6%7%7%9%22%
1980
October1st to 15thDay
7%5%27%6%46%6%6%6%38%
1938
16th to endDay
9%6%35%5%445%46%45%
1920
November1st to 15thDay
6%3145%25%46%8%51%
1907
16th to endDay
7%5%25%5%35%45%6%48%
1882
December1st to 15thDay
9%6%346%35%5%6%7%42%
1632
16th to endDay
7%425%5%36%46%7%44%
1728
January1st to 15thNight
8%6%25%5%45%5%6%8%40%
2327
16th to endNight
11%5%244345%6%8%43%
2394
February1st to 15thNight
10%5%24434446%49%
2103
16th to endNight
5%4144245%8%9%49%
1840
March1st to 15thNight
5%213425%45%9%56%
1980
16th to endNight
5%325%42345%8%54%
2112
April1st to 15thNight
43123335%6%9%56%
1976
16th to endNight
4315%335%5%5%8%52%
1878
May1st to 15thNight
322342345%8%58%
1649
16th to endNight
5%215%5%346%6%8%49%
1682
June1st to 15thNight
9%5%36%7%45%5%8%9%34%
1620
16th to endNight
5%325%6%47%8%9%16%31%
1620
July1st to 15thNight
6%6%47%6%37%7%9%11%30%
1620
16th to endNight
3437%6%48%7%11%14%27%
1703
August1st to 15thNight
4425%5%47%6%9%14%33%
1680
16th to endNight
8%426%8%5%7%6%8%10%30%
2052
September1st to 15thNight
7%6%37%6%46%7%7%12%29%
1980
16th to endNight
9%6%37%8%37%7%8%10%27%
1980
October1st to 15thNight
6%5%25%5%3446%9%46%
2021
16th to endNight
9%5%2443445%9%47%
2304
November1st to 15thNight
5%42433445%8%52%
2281
16th to endNight
7%3144345%5%8%50%
2405
December1st to 15thNight
8%425%5%36%45%7%45%
2365
16th to endNight
6%424425%5%6%9%47%
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%47%22%18%4
1612
16th to endDay
36%37%21%23%7%
1827
February1st to 15thDay
37%36%18%20%13%
1752
16th to endDay
32%310%19%23%10%
1631
March1st to 15thDay
27%211%27%22%9%
1980
16th to endDay
33%39%22%21%8%
2112
April1st to 15thDay
33%412%22%20%5%
1972
16th to endDay
33%410%18%25%7%
2080
May1st to 15thDay
29%5%12%24%20%7%
2310
16th to endDay
43%5%14%20%15%1
2435
June1st to 15thDay
57%5%18%14%3
2340
16th to endDay
52%9%22%13%1
2340
July1st to 15thDay
57%12%20%6%1
2201
16th to endDay
54%10%23%9%1
2310
August1st to 15thDay
53%9%28%8%
2264
16th to endDay
56%11%21%9%
2136
September1st to 15thDay
55%9%21%10%2
1980
16th to endDay
53%7%16%15%41
1980
October1st to 15thDay
41%5%10%19%17%6%
1938
16th to endDay
39%37%15%21%12%
1920
November1st to 15thDay
29%38%25%23%9%
1907
16th to endDay
34%48%20%19%12%
1882
December1st to 15thDay
39%411%22%16%6%
1632
16th to endDay
37%410%22%18%6%
1728
January1st to 15thNight
39%412%24%15%4
2327
16th to endNight
36%48%22%20%7%
2394
February1st to 15thNight
35%36%19%21%12%
2112
16th to endNight
27%414%23%22%8%
1840
March1st to 15thNight
24%312%30%21%7%
1980
16th to endNight
27%412%26%21%8%
2112
April1st to 15thNight
23%318%26%20%6%
1976
16th to endNight
28%412%24%24%5%
1878
May1st to 15thNight
22%5%13%31%20%6%
1650
16th to endNight
29%6%18%27%17%1
1684
June1st to 15thNight
42%8%25%16%5%
1620
16th to endNight
37%14%27%15%5%
1620
July1st to 15thNight
44%13%31%8%1
1530
16th to endNight
39%13%31%15%
1595
August1st to 15thNight
35%13%39%11%
1669
16th to endNight
44%12%30%10%1
2052
September1st to 15thNight
44%13%26%14%2
1980
16th to endNight
47%9%20%15%5%1
1980
October1st to 15thNight
32%5%14%19%19%6%
2021
16th to endNight
35%49%17%22%10%
2304
November1st to 15thNight
28%38%25%24%9%
2281
16th to endNight
30%48%24%20%11%
2405
December1st to 15thNight
35%411%26%17%5%
2365
16th to endNight
31%414%22%19%6%
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
18%6%34%21%16%2
90
16th to endDay
14%15%32%25%9%3
96
February1st to 15thDay
12%10%28%26%15%6%
90
16th to endDay
8%331%40%15%
132
March1st to 15thDay
4230%33%23%4
270
16th to endDay
9%420%31%28%5%
288
April1st to 15thDay
6%222%30%29%8%
270
16th to endDay
7%411%30%31%14%
270
May1st to 15thDay
5%39%24%36%21%
288
16th to endDay
6%25%17%31%37%
331
June1st to 15thDay
19%2412%19%40%
315
16th to endDay
8%316%19%59%
315
July1st to 15thDay
6%1217%70%
305
16th to endDay
13%37%17%57%
326
August1st to 15thDay
8%16%19%63%
313
16th to endDay
12%117%24%53%
332
September1st to 15thDay
11%329%24%48%
315
16th to endDay
6%112%42%36%
314
October1st to 15thDay
9%28%30%32%15%
315
16th to endDay
11%218%31%25%11%
336
November1st to 15thDay
8%13%35%33%8%
325
16th to endDay
8%321%33%25%7%
262
December1st to 15thDay
12%134%37%13%1
94
16th to endDay
6%48%41%35%4
96
January1st to 15thNight
10%6%20%42%18%1
720
16th to endNight
13%5%23%41%16%
768
February1st to 15thNight
12%5%26%40%14%
704
16th to endNight
6%327%47%14%
631
March1st to 15thNight
6%429%43%15%
720
16th to endNight
6%324%45%19%1
768
April1st to 15thNight
5%320%47%21%1
718
16th to endNight
6%120%45%24%
720
May1st to 15thNight
419%49%32%2
570
16th to endNight
415%38%41%8%
563
June1st to 15thNight
10%2121%48%16%
540
16th to endNight
5%210%45%35%
540
July1st to 15thNight
8%1444%40%
510
16th to endNight
415%46%41%
564
August1st to 15thNight
7%446%39%
539
16th to endNight
11%2211%40%31%
715
September1st to 15thNight
10%1316%41%26%
720
16th to endNight
12%1220%45%17%
717
October1st to 15thNight
10%17%41%34%5%
720
16th to endNight
11%217%34%30%3
768
November1st to 15thNight
7%118%43%25%3
760
16th to endNight
8%223%41%22%1
780
December1st to 15thNight
9%220%41%24%
728
16th to endNight
9%220%41%23%2
768
Page generated at 2017-12-03 11:16:44. Version ac04

Copyright 2017 A. Danko


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