Vero Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vero Beach clear sky chart from 2005-11-05 to 2017-12-20.

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
55%
16542
19%
48041
14%
16502
60%
16502
25%
30811

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
41%
718
17%
2327
11%
716
51%
716
22%
1446
January16th to endNight
42%
768
24%
2496
18%
768
52%
768
24%
1484
February1st to 15thNight
46%
701
25%
2116
18%
699
56%
699
28%
1245
February16th to endNight
49%
631
27%
1749
15%
631
61%
631
31%
1029
March1st to 15thNight
45%
720
28%
1980
17%
720
56%
720
32%
1145
March16th to endNight
53%
768
25%
2112
17%
768
60%
768
33%
1247
April1st to 15thNight
61%
718
23%
1964
17%
718
66%
718
37%
1088
April16th to endNight
56%
720
24%
1800
13%
720
61%
720
32%
1116
May1st to 15thNight
62%
708
24%
1789
15%
708
65%
708
38%
1064
May16th to endNight
63%
561
19%
1682
13%
561
66%
561
27%
1048
June1st to 15thNight
56%
540
10%
1620
6%
540
57%
540
17%
1155
June16th to endNight
63%
540
10%
1620
8%
540
65%
540
21%
1096
July1st to 15thNight
60%
510
7%
1530
6%
510
61%
510
19%
1103
July16th to endNight
68%
564
9%
1595
7%
531
73%
531
25%
1059
August1st to 15thNight
69%
578
9%
1648
8%
575
70%
575
26%
1075
August16th to endNight
61%
764
6%
1980
5%
764
62%
764
21%
1458
September1st to 15thNight
63%
720
7%
1980
6%
720
63%
720
19%
1474
September16th to endNight
54%
717
9%
1980
6%
717
57%
717
15%
1506
October1st to 15thNight
58%
720
20%
2102
20%
720
60%
720
23%
1383
October16th to endNight
53%
768
22%
2304
17%
768
60%
768
23%
1501
November1st to 15thNight
53%
760
22%
2281
20%
760
58%
760
25%
1462
November16th to endNight
46%
780
25%
2340
18%
780
55%
780
21%
1546
December1st to 15thNight
47%
780
24%
2487
20%
780
54%
780
22%
1579
December16th to endNight
53%
788
23%
2559
18%
788
61%
788
26%
1502

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%10%34%
48779
Night
7%5%25%5%36%6%7%10%39%
48248
TransparencyDay
41%7%17%18%11%3
48480
Night
37%7%16%20%13%4
48051
SeeingDay
8%9%7%19%29%25%
6346
Night
8%16%8%22%29%14%
16550

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
11%5%25%6%46%6%7%8%34%
1611
16th to endDay
10%4245%36%5%7%9%40%
1728
February1st to 15thDay
9%5%35%5%345%6%6%44%
1735
16th to endDay
7%423436%5%6%8%46%
1723
March1st to 15thDay
5%425%6%35%5%6%8%46%
1980
16th to endDay
7%4246%345%5%9%45%
2111
April1st to 15thDay
5%314436%6%8%10%44%
1984
16th to endDay
6%425%5%46%6%7%9%41%
2160
May1st to 15thDay
5%423336%6%6%10%46%
2170
16th to endDay
8%436%7%47%8%8%9%30%
2431
June1st to 15thDay
10%7%47%7%47%7%8%12%22%
2340
16th to endDay
7%5%36%7%47%9%9%13%25%
2340
July1st to 15thDay
9%5%46%6%47%8%9%13%23%
2340
16th to endDay
7%437%8%48%8%9%11%25%
2465
August1st to 15thDay
5%5%26%6%38%9%9%14%28%
2286
16th to endDay
10%5%26%7%5%8%7%8%11%24%
2217
September1st to 15thDay
6%6%27%8%5%9%8%10%11%22%
1980
16th to endDay
10%7%38%8%5%8%8%8%10%21%
1980
October1st to 15thDay
8%7%36%6%47%7%8%11%28%
1857
16th to endDay
12%5%35%5%36%6%6%9%36%
1920
November1st to 15thDay
7%5%26%7%37%5%7%8%37%
1907
16th to endDay
9%5%27%6%45%6%5%9%37%
1950
December1st to 15thDay
11%6%37%5%35%5%6%8%37%
1800
16th to endDay
6%425%6%36%47%11%40%
1764
January1st to 15thNight
9%6%35%6%3447%10%37%
2327
16th to endNight
9%5%35%4345%6%7%44%
2496
February1st to 15thNight
11%5%2442345%7%49%
2115
16th to endNight
7%324325%5%6%7%50%
1749
March1st to 15thNight
44245%345%48%51%
1980
16th to endNight
6%324435%47%8%49%
2112
April1st to 15thNight
5%113325%5%5%9%55%
1964
16th to endNight
7%3145%346%7%9%46%
1800
May1st to 15thNight
6%213425%46%9%52%
1788
16th to endNight
6%3246%36%7%9%12%36%
1682
June1st to 15thNight
10%6%37%6%38%7%9%12%24%
1620
16th to endNight
6%325%6%47%7%9%12%32%
1620
July1st to 15thNight
9%6%37%6%36%6%7%10%32%
1620
16th to endNight
4434437%6%9%13%36%
1703
August1st to 15thNight
44246%46%7%9%13%36%
1659
16th to endNight
8%6%27%6%46%7%7%12%29%
1980
September1st to 15thNight
6%5%38%7%5%8%8%9%12%23%
1980
16th to endNight
9%8%48%8%5%7%7%6%9%23%
1980
October1st to 15thNight
8%6%36%5%36%7%8%8%35%
2102
16th to endNight
11%6%25%5%35%6%5%10%36%
2304
November1st to 15thNight
6%5%35%6%36%6%6%8%38%
2281
16th to endNight
9%6%36%6%45%6%6%8%36%
2340
December1st to 15thNight
9%5%36%6%35%5%6%8%38%
2487
16th to endNight
6%5%35%5%35%5%7%9%42%
2559

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
44%5%10%19%14%4
1612
16th to endDay
38%48%22%19%7%
1728
February1st to 15thDay
36%29%20%20%9%
1737
16th to endDay
33%414%20%20%6%
1723
March1st to 15thDay
34%311%28%17%4
1980
16th to endDay
35%412%23%19%5%
2112
April1st to 15thDay
30%5%16%23%19%3
1984
16th to endDay
34%5%11%21%22%4
2160
May1st to 15thDay
29%5%14%26%18%5%
2170
16th to endDay
43%5%17%21%11%
2435
June1st to 15thDay
50%8%19%17%3
2340
16th to endDay
42%11%26%15%3
2340
July1st to 15thDay
44%12%29%12%
2201
16th to endDay
43%11%28%16%
2310
August1st to 15thDay
39%12%35%13%
2273
16th to endDay
47%13%26%11%
2217
September1st to 15thDay
47%12%25%12%2
1980
16th to endDay
52%10%20%11%4
1980
October1st to 15thDay
45%6%12%17%13%3
1857
16th to endDay
43%49%15%21%6%
1920
November1st to 15thDay
41%48%23%16%5%
1907
16th to endDay
42%5%8%18%17%8%
1950
December1st to 15thDay
43%412%20%13%5%
1800
16th to endDay
36%414%23%16%5%
1764
January1st to 15thNight
40%415%21%12%5%
2327
16th to endNight
37%310%24%15%7%
2496
February1st to 15thNight
34%48%21%22%9%
2124
16th to endNight
30%5%14%23%20%5%
1749
March1st to 15thNight
30%311%29%19%5%
1980
16th to endNight
30%412%25%19%7%
2112
April1st to 15thNight
25%418%27%18%4
1964
16th to endNight
31%5%13%22%21%4
1800
May1st to 15thNight
27%5%13%29%17%6%
1789
16th to endNight
35%7%20%25%11%
1684
June1st to 15thNight
47%9%22%15%4
1620
16th to endNight
36%14%27%18%2
1620
July1st to 15thNight
44%12%25%15%1
1530
16th to endNight
32%15%32%17%1
1595
August1st to 15thNight
33%12%38%14%
1648
16th to endNight
43%13%28%13%
1980
September1st to 15thNight
47%12%24%12%2
1980
16th to endNight
51%11%18%14%4
1980
October1st to 15thNight
41%6%14%16%17%2
2102
16th to endNight
41%5%9%16%19%7%
2304
November1st to 15thNight
40%5%8%22%17%6%
2281
16th to endNight
43%5%7%18%16%8%
2340
December1st to 15thNight
41%5%10%23%13%5%
2487
16th to endNight
35%5%15%23%15%5%
2559

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
16%6%22%24%22%7%
90
16th to endDay
18%10%20%26%21%2
96
February1st to 15thDay
5%317%42%25%5%
90
16th to endDay
10%13%18%36%19%1
224
March1st to 15thDay
6%14%20%34%20%4
270
16th to endDay
5%14%15%32%24%7%
288
April1st to 15thDay
213%12%32%31%5%
270
16th to endDay
6%12%9%23%40%8%
270
May1st to 15thDay
5%10%326%38%15%
288
16th to endDay
6%11%210%38%31%
331
June1st to 15thDay
11%10%211%28%35%
315
16th to endDay
410%1424%54%
315
July1st to 15thDay
5%7%24%61%
305
16th to endDay
7%9%1328%50%
326
August1st to 15thDay
45%329%55%
313
16th to endDay
12%5%25%21%53%
332
September1st to 15thDay
8%5%17%28%47%
315
16th to endDay
14%5%27%30%39%
314
October1st to 15thDay
12%6%420%40%15%
315
16th to endDay
12%8%12%29%29%7%
336
November1st to 15thDay
8%11%6%31%31%11%
325
16th to endDay
6%12%9%37%30%3
330
December1st to 15thDay
10%412%38%32%2
180
16th to endDay
416%25%46%15%
108
January1st to 15thNight
11%21%16%23%23%3
720
16th to endNight
9%21%19%31%17%1
768
February1st to 15thNight
10%19%16%32%18%2
704
16th to endNight
9%17%16%36%19%1
631
March1st to 15thNight
6%19%18%31%18%4
720
16th to endNight
6%17%13%33%25%3
768
April1st to 15thNight
317%10%32%31%4
718
16th to endNight
8%18%7%30%31%4
720
May1st to 15thNight
5%17%5%26%40%4
709
16th to endNight
5%18%118%37%18%
563
June1st to 15thNight
10%18%110%36%22%
540
16th to endNight
6%17%25%31%38%
540
July1st to 15thNight
9%12%330%43%
510
16th to endNight
417%430%42%
564
August1st to 15thNight
5%10%1335%44%
578
16th to endNight
8%9%27%32%40%
764
September1st to 15thNight
8%9%17%35%37%
720
16th to endNight
13%8%110%36%29%
717
October1st to 15thNight
12%9%423%37%12%
720
16th to endNight
16%10%10%23%29%9%
768
November1st to 15thNight
7%16%11%28%30%5%
760
16th to endNight
12%17%11%31%23%4
780
December1st to 15thNight
9%19%11%29%24%5%
780
16th to endNight
9%19%10%25%31%4
788
Page generated at 2017-12-21 07:04:43. Version ac04

Copyright 2017 A. Danko


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