Daytona Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Daytona Beach clear sky chart from 2005-11-05 to 2017-08-12.

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%
15860
19%
46529
16%
15822
65%
15822
28%
29773

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
45%
716
19%
2327
14%
716
53%
716
23%
1496
January16th to endNight
44%
768
23%
2496
17%
768
54%
768
27%
1535
February1st to 15thNight
47%
701
23%
2116
16%
699
56%
699
31%
1282
February16th to endNight
51%
631
24%
1803
15%
631
60%
631
32%
1099
March1st to 15thNight
61%
720
28%
1980
20%
720
67%
720
44%
1123
March16th to endNight
62%
768
24%
2112
19%
768
65%
768
38%
1258
April1st to 15thNight
64%
718
23%
1976
17%
718
67%
718
38%
1166
April16th to endNight
67%
720
25%
1800
16%
720
70%
720
40%
1112
May1st to 15thNight
72%
605
25%
1685
19%
605
74%
605
41%
964
May16th to endNight
73%
561
21%
1682
18%
561
74%
561
31%
1056
June1st to 15thNight
70%
540
14%
1620
12%
540
70%
540
28%
1062
June16th to endNight
70%
540
9%
1620
7%
540
70%
540
23%
1108
July1st to 15thNight
74%
510
9%
1530
8%
510
74%
510
23%
1038
July16th to endNight
72%
564
10%
1595
10%
531
74%
531
24%
1073
August1st to 15thNight
74%
527
8%
1575
7%
524
74%
524
24%
1089
August16th to endNight
67%
682
10%
1817
9%
682
67%
682
22%
1322
September1st to 15thNight
65%
660
9%
1815
8%
660
65%
660
18%
1373
September16th to endNight
55%
657
10%
1815
10%
657
56%
657
15%
1423
October1st to 15thNight
63%
660
23%
1908
24%
660
64%
660
27%
1250
October16th to endNight
62%
704
24%
2112
25%
704
66%
704
30%
1299
November1st to 15thNight
59%
700
23%
2101
21%
700
63%
700
29%
1290
November16th to endNight
54%
720
23%
2208
18%
720
61%
720
28%
1372
December1st to 15thNight
54%
720
24%
2340
23%
720
60%
720
26%
1448
December16th to endNight
54%
768
21%
2496
19%
768
60%
768
27%
1535

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%36%6%7%9%37%
47428
Night
8%5%25%5%35%5%6%9%42%
46736
TransparencyDay
37%10%17%18%12%4
47129
Night
36%8%16%19%13%5%
46539
SeeingDay
9%19%21%32%26%
5694
Night
10%214%27%33%12%
15870

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%7%35%5%346%5%9%38%
1611
16th to endDay
10%6%25%425%6%5%6%42%
1728
February1st to 15thDay
10%6%25%6%45%446%43%
1738
16th to endDay
9%5%35%5%3445%7%46%
1667
March1st to 15thDay
6%313435%36%9%51%
1980
16th to endDay
8%435%4345%5%6%49%
2111
April1st to 15thDay
5%415%5%35%6%6%10%46%
1972
16th to endDay
6%4245%35%47%10%47%
2159
May1st to 15thDay
6%314435%5%6%9%49%
2274
16th to endDay
7%325%6%36%6%8%10%38%
2431
June1st to 15thDay
9%5%36%6%47%7%8%10%30%
2340
16th to endDay
8%5%26%7%48%7%8%10%29%
2340
July1st to 15thDay
8%5%36%6%48%8%8%10%28%
2340
16th to endDay
7%5%37%7%5%8%7%8%10%27%
2465
August1st to 15thDay
5%5%26%7%48%8%9%13%27%
2288
16th to endDay
10%6%36%6%48%7%7%11%26%
2019
September1st to 15thDay
7%6%38%7%6%8%8%8%10%24%
1815
16th to endDay
13%7%48%8%46%7%9%9%20%
1815
October1st to 15thDay
9%6%36%6%45%5%6%8%35%
1720
16th to endDay
10%6%25%5%35%45%8%42%
1760
November1st to 15thDay
6%426%6%45%5%5%8%44%
1757
16th to endDay
9%6%26%5%35%46%8%39%
1750
December1st to 15thDay
9%6%35%6%35%5%6%8%38%
1620
16th to endDay
8%5%245%26%6%7%9%39%
1728
January1st to 15thNight
10%7%35%435%5%5%7%39%
2327
16th to endNight
12%5%25%5%245%5%7%43%
2496
February1st to 15thNight
11%424424346%50%
2114
16th to endNight
8%415%4345%48%48%
1803
March1st to 15thNight
6%31332445%9%55%
1980
16th to endNight
6%425%424346%56%
2112
April1st to 15thNight
6%42443345%8%51%
1976
16th to endNight
7%413435%45%8%51%
1800
May1st to 15thNight
6%2134235%6%8%54%
1685
16th to endNight
7%3245%346%7%11%42%
1682
June1st to 15thNight
8%426%5%27%6%7%13%35%
1620
16th to endNight
6%5%37%6%36%7%8%11%32%
1620
July1st to 15thNight
8%415%5%46%6%9%13%34%
1620
16th to endNight
4337%7%37%7%7%12%34%
1703
August1st to 15thNight
4436%7%46%7%9%11%34%
1586
16th to endNight
8%5%36%7%45%7%8%11%31%
1817
September1st to 15thNight
9%5%37%6%48%7%8%10%28%
1815
16th to endNight
12%8%38%8%46%7%7%10%21%
1815
October1st to 15thNight
7%6%27%6%346%6%9%40%
1908
16th to endNight
10%5%34435%45%8%45%
2112
November1st to 15thNight
5%5%25%6%45%5%6%8%42%
2101
16th to endNight
8%5%25%5%35%6%6%9%42%
2208
December1st to 15thNight
11%5%26%435%46%7%42%
2340
16th to endNight
9%5%25%435%5%7%9%41%
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%6%12%17%15%6%
1612
16th to endDay
38%7%9%16%19%9%
1728
February1st to 15thDay
39%6%9%13%20%11%
1740
16th to endDay
35%6%13%17%18%8%
1667
March1st to 15thDay
27%6%14%27%19%5%
1980
16th to endDay
32%6%14%21%19%6%
2112
April1st to 15thDay
29%7%13%23%19%5%
1972
16th to endDay
30%6%13%24%19%5%
2159
May1st to 15thDay
28%7%14%23%20%5%
2274
16th to endDay
31%10%20%21%13%2
2435
June1st to 15thDay
41%12%20%21%4
2340
16th to endDay
41%13%24%15%4
2340
July1st to 15thDay
40%18%23%15%1
2201
16th to endDay
40%16%25%15%1
2310
August1st to 15thDay
38%18%29%11%1
2275
16th to endDay
44%15%25%12%1
2019
September1st to 15thDay
45%16%22%10%5%
1815
16th to endDay
51%13%17%12%32
1815
October1st to 15thDay
41%8%11%15%16%6%
1720
16th to endDay
38%5%9%16%21%8%
1760
November1st to 15thDay
34%5%12%20%20%5%
1757
16th to endDay
40%6%11%15%18%8%
1750
December1st to 15thDay
40%6%14%21%13%4
1620
16th to endDay
35%7%16%19%12%7%
1728
January1st to 15thNight
42%5%10%20%14%6%
2327
16th to endNight
39%49%17%20%8%
2496
February1st to 15thNight
35%49%17%18%14%
2123
16th to endNight
33%7%13%18%19%7%
1803
March1st to 15thNight
25%5%15%28%18%6%
1980
16th to endNight
29%6%11%22%20%9%
2112
April1st to 15thNight
29%6%13%22%19%8%
1976
16th to endNight
30%5%13%25%18%6%
1800
May1st to 15thNight
26%7%14%26%18%6%
1686
16th to endNight
31%11%16%24%14%1
1684
June1st to 15thNight
36%10%23%24%4
1620
16th to endNight
38%13%23%18%5%
1620
July1st to 15thNight
37%13%29%15%2
1530
16th to endNight
37%13%28%18%2
1595
August1st to 15thNight
37%14%33%12%1
1575
16th to endNight
43%12%24%16%1
1817
September1st to 15thNight
45%16%18%13%5%
1815
16th to endNight
53%12%14%13%41
1815
October1st to 15thNight
39%8%11%17%17%6%
1908
16th to endNight
36%5%10%16%21%9%
2112
November1st to 15thNight
35%7%13%18%19%6%
2101
16th to endNight
36%6%12%17%16%9%
2208
December1st to 15thNight
39%5%13%24%12%5%
2340
16th to endNight
37%6%15%21%11%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
18%124%31%13%11%
90
16th to endDay
15%5%25%36%14%3
96
February1st to 15thDay
7%8%25%24%25%7%
90
16th to endDay
13%225%45%13%
168
March1st to 15thDay
8%320%43%21%3
270
16th to endDay
10%217%29%32%6%
288
April1st to 15thDay
7%318%33%28%10%
270
16th to endDay
7%18%27%38%16%
270
May1st to 15thDay
6%10%27%38%16%
288
16th to endDay
5%413%41%34%
331
June1st to 15thDay
11%1313%33%35%
315
16th to endDay
7%29%29%48%
315
July1st to 15thDay
36%26%62%
305
16th to endDay
8%1434%50%
326
August1st to 15thDay
6%19%34%47%
297
16th to endDay
13%26%26%50%
268
September1st to 15thDay
11%39%34%40%
255
16th to endDay
15%25%6%31%38%
254
October1st to 15thDay
14%15%27%41%10%
255
16th to endDay
9%211%27%41%7%
272
November1st to 15thDay
5%211%31%35%13%
265
16th to endDay
12%120%31%28%5%
220
December1st to 15thDay
7%113%45%31%1
90
16th to endDay
8%37%26%44%10%
96
January1st to 15thNight
15%5%25%30%19%3
720
16th to endNight
14%5%28%34%15%
768
February1st to 15thNight
14%426%37%14%2
704
16th to endNight
12%324%44%14%
631
March1st to 15thNight
6%323%41%21%2
720
16th to endNight
8%218%37%28%5%
768
April1st to 15thNight
7%218%38%28%4
718
16th to endNight
8%214%35%35%4
720
May1st to 15thNight
6%112%36%38%5%
606
16th to endNight
8%6%22%44%17%
563
June1st to 15thNight
10%419%45%19%
540
16th to endNight
8%212%47%29%
540
July1st to 15thNight
8%18%42%37%
510
16th to endNight
5%210%52%29%
564
August1st to 15thNight
7%29%48%31%
527
16th to endNight
10%1310%42%31%
682
September1st to 15thNight
11%15%11%45%25%
660
16th to endNight
15%2413%42%21%
657
October1st to 15thNight
12%17%27%41%9%
660
16th to endNight
12%310%26%40%6%
704
November1st to 15thNight
8%414%36%30%6%
700
16th to endNight
12%421%33%22%5%
720
December1st to 15thNight
14%417%29%26%7%
720
16th to endNight
12%420%29%28%4
768
Page generated at 2017-08-13 14:16:41. Version ac04

Copyright 2017 A. Danko


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