Pompano Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pompano Beach clear sky chart from 2005-11-05 to 2018-02-13.

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%
16876
17%
48740
12%
16838
60%
16838
22%
32623

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
43%
776
15%
2522
10%
776
51%
776
18%
1655
January16th to endNight
46%
832
21%
2697
16%
832
55%
832
23%
1653
February1st to 15thNight
53%
750
25%
2230
20%
748
59%
748
30%
1343
February16th to endNight
51%
631
27%
1735
14%
631
63%
631
29%
1047
March1st to 15thNight
48%
720
24%
1980
14%
720
57%
720
30%
1202
March16th to endNight
52%
768
23%
2112
16%
768
57%
768
30%
1285
April1st to 15thNight
63%
718
23%
1966
16%
718
69%
718
38%
1106
April16th to endNight
52%
720
21%
1800
11%
720
58%
720
30%
1138
May1st to 15thNight
64%
719
22%
1799
14%
719
67%
719
37%
1074
May16th to endNight
60%
623
13%
1745
11%
623
61%
623
22%
1239
June1st to 15thNight
53%
540
8%
1620
6%
540
55%
540
13%
1247
June16th to endNight
65%
540
8%
1620
6%
540
66%
540
18%
1150
July1st to 15thNight
62%
510
5%
1530
6%
510
62%
510
16%
1146
July16th to endNight
67%
564
9%
1595
8%
531
72%
531
25%
1056
August1st to 15thNight
68%
624
7%
1694
6%
621
68%
621
25%
1159
August16th to endNight
62%
764
6%
1988
5%
764
62%
764
18%
1506
September1st to 15thNight
60%
720
4%
1980
4%
720
60%
720
14%
1552
September16th to endNight
54%
717
6%
1980
4%
717
57%
717
11%
1613
October1st to 15thNight
59%
720
12%
2106
13%
720
59%
720
16%
1535
October16th to endNight
49%
768
16%
2304
13%
768
54%
768
17%
1641
November1st to 15thNight
54%
760
21%
2281
18%
760
59%
760
23%
1469
November16th to endNight
47%
780
21%
2340
16%
780
55%
780
20%
1578
December1st to 15thNight
48%
780
20%
2412
17%
780
54%
780
20%
1592
December16th to endNight
59%
832
23%
2704
21%
832
64%
832
26%
1637

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%6%36%7%47%7%8%10%28%
49281
Night
7%5%25%6%36%6%7%10%37%
48944
TransparencyDay
44%11%16%15%9%2
48983
Night
38%10%17%19%10%2
48746
SeeingDay
9%8%8%19%29%25%
6623
Night
9%15%9%23%28%14%
16886

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%6%37%6%46%6%7%10%31%
1746
16th to endDay
8%6%35%5%37%6%7%9%34%
1875
February1st to 15thDay
9%7%25%5%35%6%7%10%37%
1890
16th to endDay
7%5%25%5%45%5%6%10%42%
1738
March1st to 15thDay
5%426%6%46%6%8%11%37%
1980
16th to endDay
6%426%6%46%7%8%10%36%
2111
April1st to 15thDay
6%4345%46%7%8%11%38%
1981
16th to endDay
7%425%5%37%7%8%10%35%
2160
May1st to 15thDay
4325%5%47%7%7%11%40%
2152
16th to endDay
9%7%37%8%5%8%7%8%11%22%
2375
June1st to 15thDay
12%7%49%8%6%8%9%7%9%16%
2340
16th to endDay
7%5%37%9%5%10%9%9%11%18%
2340
July1st to 15thDay
8%6%38%7%5%8%9%10%12%19%
2340
16th to endDay
6%437%8%6%8%8%9%15%21%
2465
August1st to 15thDay
6%6%37%7%5%7%8%11%13%21%
2241
16th to endDay
10%5%27%8%5%9%8%10%11%19%
2211
September1st to 15thDay
7%5%39%10%7%8%10%10%10%15%
1980
16th to endDay
11%9%49%11%6%8%8%7%8%14%
1980
October1st to 15thDay
8%7%37%9%5%7%9%8%12%19%
1852
16th to endDay
13%8%27%7%46%6%6%9%27%
1920
November1st to 15thDay
8%5%25%7%36%7%7%9%35%
1907
16th to endDay
11%5%26%8%47%6%6%8%33%
1950
December1st to 15thDay
10%7%45%7%46%6%7%7%33%
1875
16th to endDay
7%5%35%5%37%6%7%11%35%
1872
January1st to 15thNight
9%6%35%5%36%5%7%10%34%
2522
16th to endNight
6%425%5%35%7%7%10%39%
2697
February1st to 15thNight
9%5%234235%7%9%45%
2226
16th to endNight
5%315%5%25%5%7%9%47%
1735
March1st to 15thNight
5%324425%5%6%9%48%
1980
16th to endNight
5%315%5%346%6%10%46%
2112
April1st to 15thNight
32134245%7%12%52%
1966
16th to endNight
6%425%5%25%5%7%9%45%
1800
May1st to 15thNight
3314326%5%7%9%52%
1799
16th to endNight
8%6%26%5%46%6%9%12%31%
1744
June1st to 15thNight
12%6%27%8%5%6%8%8%10%22%
1620
16th to endNight
4326%6%47%8%11%12%30%
1620
July1st to 15thNight
5%5%47%8%5%7%6%7%11%29%
1620
16th to endNight
3335%6%46%7%7%12%39%
1703
August1st to 15thNight
5%315%447%7%8%13%36%
1705
16th to endNight
7%5%36%6%47%8%9%11%28%
1988
September1st to 15thNight
7%437%8%48%9%10%12%22%
1980
16th to endNight
9%6%48%9%5%8%8%9%9%20%
1980
October1st to 15thNight
7%6%27%8%47%8%8%10%26%
2106
16th to endNight
14%7%26%6%45%5%6%7%31%
2304
November1st to 15thNight
7%5%36%6%35%6%6%8%39%
2281
16th to endNight
11%5%35%6%37%6%5%8%35%
2340
December1st to 15thNight
9%6%25%5%36%5%7%9%37%
2412
16th to endNight
7%4245%36%5%7%10%42%
2704

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%8%12%16%12%4
1747
16th to endDay
40%8%12%20%13%5%
1875
February1st to 15thDay
38%5%12%22%15%5%
1893
16th to endDay
34%7%13%23%15%5%
1738
March1st to 15thDay
34%7%16%23%14%2
1980
16th to endDay
36%7%15%20%14%5%
2112
April1st to 15thDay
31%9%18%24%13%2
1981
16th to endDay
36%9%13%20%16%3
2160
May1st to 15thDay
32%6%17%24%13%5%
2152
16th to endDay
48%12%16%17%5%
2379
June1st to 15thDay
59%14%13%9%3
2340
16th to endDay
50%16%21%9%
2340
July1st to 15thDay
48%18%24%8%
2201
16th to endDay
44%19%26%9%
2310
August1st to 15thDay
43%19%24%10%1
2228
16th to endDay
49%17%23%8%
2211
September1st to 15thDay
53%19%20%6%1
1980
16th to endDay
60%16%14%5%3
1980
October1st to 15thDay
50%12%16%12%6%
1852
16th to endDay
50%7%11%14%11%4
1920
November1st to 15thDay
41%7%13%17%16%3
1907
16th to endDay
46%7%10%12%16%5%
1950
December1st to 15thDay
45%7%11%17%14%3
1875
16th to endDay
37%7%14%23%15%2
1872
January1st to 15thNight
41%9%15%19%11%2
2522
16th to endNight
35%8%15%21%13%4
2697
February1st to 15thNight
32%6%12%27%15%5%
2234
16th to endNight
29%8%13%26%16%5%
1735
March1st to 15thNight
29%8%13%24%18%4
1980
16th to endNight
31%7%16%24%16%4
2112
April1st to 15thNight
23%7%19%29%16%3
1966
16th to endNight
31%8%16%21%18%4
1800
May1st to 15thNight
25%8%14%32%15%5%
1800
16th to endNight
40%12%17%22%6%
1746
June1st to 15thNight
51%13%18%12%3
1620
16th to endNight
39%16%29%12%1
1620
July1st to 15thNight
45%16%26%10%
1530
16th to endNight
32%15%34%15%1
1595
August1st to 15thNight
34%15%30%17%1
1694
16th to endNight
41%19%25%12%1
1988
September1st to 15thNight
47%19%22%9%1
1980
16th to endNight
54%16%16%9%3
1980
October1st to 15thNight
46%12%16%14%8%1
2106
16th to endNight
48%8%11%15%11%4
2304
November1st to 15thNight
38%7%10%21%17%4
2281
16th to endNight
43%7%10%16%15%6%
2340
December1st to 15thNight
40%9%12%17%16%3
2412
16th to endNight
34%8%12%25%17%2
2704

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
22%5%14%37%19%
135
16th to endDay
11%420%40%18%4
144
February1st to 15thDay
9%410%37%31%8%
148
16th to endDay
8%11%19%37%21%1
239
March1st to 15thDay
6%13%17%39%18%4
270
16th to endDay
6%13%16%33%25%5%
288
April1st to 15thDay
312%11%36%29%5%
270
16th to endDay
7%11%8%25%42%5%
270
May1st to 15thDay
411%325%42%12%
288
16th to endDay
8%10%310%35%31%
331
June1st to 15thDay
11%10%311%30%33%
315
16th to endDay
49%2422%56%
315
July1st to 15thDay
7%6%219%61%
305
16th to endDay
310%2327%53%
326
August1st to 15thDay
8%5%25%23%54%
313
16th to endDay
11%5%17%25%47%
332
September1st to 15thDay
8%5%37%23%51%
315
16th to endDay
12%5%47%27%42%
314
October1st to 15thDay
11%6%6%15%40%19%
315
16th to endDay
15%7%12%26%27%11%
336
November1st to 15thDay
8%9%8%25%36%11%
325
16th to endDay
9%10%15%32%30%1
330
December1st to 15thDay
15%8%14%21%34%3
255
16th to endDay
9%418%48%18%
144
January1st to 15thNight
12%19%16%26%22%1
780
16th to endNight
8%18%19%34%17%
832
February1st to 15thNight
9%17%14%35%21%
753
16th to endNight
6%17%17%39%17%
631
March1st to 15thNight
7%19%18%30%20%3
720
16th to endNight
6%18%15%33%23%1
768
April1st to 15thNight
417%10%39%25%3
718
16th to endNight
8%17%10%31%30%1
720
May1st to 15thNight
417%6%33%35%3
720
16th to endNight
7%18%418%38%13%
625
June1st to 15thNight
10%17%212%32%24%
540
16th to endNight
416%26%32%37%
540
July1st to 15thNight
6%11%36%31%40%
510
16th to endNight
416%1330%42%
564
August1st to 15thNight
7%9%2437%38%
624
16th to endNight
9%9%37%32%37%
764
September1st to 15thNight
9%8%47%29%40%
720
16th to endNight
13%9%49%29%34%
717
October1st to 15thNight
12%9%5%20%37%14%
720
16th to endNight
19%10%8%25%25%10%
768
November1st to 15thNight
12%15%11%28%26%5%
760
16th to endNight
13%16%13%27%25%3
780
December1st to 15thNight
10%17%14%28%25%3
780
16th to endNight
7%16%10%24%34%6%
832
Page generated at 2018-02-13 20:46:07. Version ac04

Copyright 2018 A. Danko


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