Avon Park Bombing Range
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Avon Park Bombing Range clear sky chart from 2005-11-05 to 2017-09-10.

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
62%
16033
19%
46858
16%
15992
66%
15992
29%
29994

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
50%
718
18%
2327
14%
716
57%
716
26%
1450
January16th to endNight
50%
768
24%
2460
19%
768
59%
768
29%
1485
February1st to 15thNight
48%
701
23%
2103
16%
698
57%
698
32%
1281
February16th to endNight
54%
631
28%
1791
17%
631
64%
631
38%
1041
March1st to 15thNight
54%
720
29%
1980
17%
720
65%
720
42%
1113
March16th to endNight
59%
768
26%
2112
19%
768
64%
768
43%
1190
April1st to 15thNight
64%
718
22%
1976
18%
718
67%
718
43%
1108
April16th to endNight
63%
720
27%
1825
17%
720
67%
720
42%
1086
May1st to 15thNight
69%
645
25%
1725
18%
645
71%
645
42%
995
May16th to endNight
77%
561
21%
1682
16%
561
78%
561
33%
1047
June1st to 15thNight
67%
540
9%
1620
8%
540
67%
540
19%
1180
June16th to endNight
75%
540
9%
1620
7%
540
75%
540
20%
1198
July1st to 15thNight
71%
510
6%
1530
5%
510
71%
510
19%
1165
July16th to endNight
76%
564
7%
1595
7%
531
77%
531
20%
1194
August1st to 15thNight
79%
539
6%
1609
7%
536
78%
536
23%
1132
August16th to endNight
64%
761
5%
2056
5%
761
64%
761
18%
1558
September1st to 15thNight
63%
700
5%
1925
5%
700
63%
700
16%
1480
September16th to endNight
59%
657
9%
1815
9%
657
59%
657
17%
1369
October1st to 15thNight
69%
660
22%
1895
23%
660
71%
660
30%
1207
October16th to endNight
61%
704
24%
2112
23%
704
65%
704
31%
1297
November1st to 15thNight
64%
700
30%
2101
27%
700
69%
700
37%
1209
November16th to endNight
55%
720
30%
2163
24%
720
62%
720
32%
1297
December1st to 15thNight
58%
720
24%
2340
23%
720
62%
720
28%
1432
December16th to endNight
60%
768
22%
2496
21%
768
64%
768
30%
1480

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%37%7%47%6%6%8%33%
47746
Night
7%425%5%35%5%6%9%43%
47067
TransparencyDay
44%9%14%14%11%4
47447
Night
35%9%16%19%13%5%
46870
SeeingDay
8%212%20%25%30%
5871
Night
9%215%32%30%9%
16041

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%5%46%6%8%8%36%
1611
16th to endDay
9%4246%35%5%7%7%44%
1761
February1st to 15thDay
9%5%25%5%335%5%6%45%
1750
16th to endDay
7%5%35%6%25%46%7%45%
1681
March1st to 15thDay
43145%35%5%6%8%48%
1980
16th to endDay
7%435%5%46%5%6%7%45%
2111
April1st to 15thDay
6%335%6%46%6%6%9%41%
1972
16th to endDay
7%425%7%5%7%5%6%7%41%
2133
May1st to 15thDay
45%26%6%46%6%6%7%43%
2233
16th to endDay
7%6%37%8%5%7%7%6%8%31%
2431
June1st to 15thDay
11%9%48%9%5%8%7%7%9%19%
2340
16th to endDay
8%7%49%8%6%9%7%7%9%22%
2340
July1st to 15thDay
10%6%49%10%6%10%7%7%8%18%
2340
16th to endDay
7%7%5%10%9%6%9%8%7%8%19%
2465
August1st to 15thDay
6%6%29%10%5%8%8%8%11%22%
2328
16th to endDay
10%7%49%10%5%8%7%7%8%19%
2139
September1st to 15thDay
7%6%5%9%10%6%8%6%8%9%20%
1923
16th to endDay
10%9%39%9%5%8%7%8%7%18%
1815
October1st to 15thDay
7%5%26%8%47%6%8%7%33%
1734
16th to endDay
8%6%26%6%35%45%7%41%
1760
November1st to 15thDay
6%425%5%36%5%6%7%45%
1757
16th to endDay
8%5%27%6%36%5%5%7%42%
1794
December1st to 15thDay
9%7%26%7%35%5%6%7%38%
1620
16th to endDay
5%4346%36%6%5%8%44%
1728
January1st to 15thNight
8%6%25%5%345%5%9%40%
2327
16th to endNight
10%424435%46%8%44%
2460
February1st to 15thNight
10%5%24424447%47%
2103
16th to endNight
6%32332446%9%51%
1791
March1st to 15thNight
4214425%45%7%56%
1980
16th to endNight
421442445%7%56%
2112
April1st to 15thNight
322442446%9%55%
1976
16th to endNight
5%31443445%8%54%
1825
May1st to 15thNight
5%21342446%8%55%
1725
16th to endNight
5%3245%35%6%7%9%45%
1682
June1st to 15thNight
8%6%46%8%5%6%7%7%11%27%
1620
16th to endNight
6%437%6%47%6%8%11%31%
1620
July1st to 15thNight
10%5%36%6%45%5%9%10%31%
1620
16th to endNight
46%36%8%5%7%8%8%11%31%
1703
August1st to 15thNight
45%25%6%45%7%10%12%35%
1620
16th to endNight
10%6%37%6%45%7%7%12%29%
2056
September1st to 15thNight
6%6%38%8%46%8%8%12%26%
1925
16th to endNight
9%6%48%8%5%6%5%7%11%27%
1815
October1st to 15thNight
7%5%25%5%36%5%5%9%43%
1895
16th to endNight
11%6%24424448%46%
2112
November1st to 15thNight
5%3244245%6%8%51%
2101
16th to endNight
8%4245%25%45%8%47%
2163
December1st to 15thNight
8%6%35%4345%5%7%45%
2340
16th to endNight
5%425%5%36%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%8%9%18%17%4
1612
16th to endDay
36%5%8%20%19%9%
1761
February1st to 15thDay
36%5%9%15%20%11%
1752
16th to endDay
35%6%11%18%18%9%
1681
March1st to 15thDay
30%6%12%23%18%7%
1980
16th to endDay
34%7%11%19%19%7%
2112
April1st to 15thDay
36%7%13%20%17%5%
1972
16th to endDay
38%7%10%17%20%6%
2133
May1st to 15thDay
35%8%13%17%19%6%
2233
16th to endDay
46%9%12%17%11%1
2435
June1st to 15thDay
56%11%15%13%3
2340
16th to endDay
55%13%18%10%2
2340
July1st to 15thDay
59%14%18%6%1
2201
16th to endDay
56%14%18%9%
2310
August1st to 15thDay
49%16%24%8%
2315
16th to endDay
57%15%19%6%
2139
September1st to 15thDay
55%15%17%9%1
1923
16th to endDay
57%13%15%8%3
1815
October1st to 15thDay
42%10%12%14%14%5%
1734
16th to endDay
40%6%10%12%20%9%
1760
November1st to 15thDay
35%6%10%20%17%9%
1757
16th to endDay
39%6%9%16%15%11%
1794
December1st to 15thDay
43%6%12%16%14%5%
1620
16th to endDay
34%7%14%20%16%7%
1728
January1st to 15thNight
37%7%14%20%14%5%
2327
16th to endNight
35%5%10%22%16%8%
2460
February1st to 15thNight
35%5%8%17%20%12%
2112
16th to endNight
27%7%12%23%19%8%
1791
March1st to 15thNight
25%5%12%28%21%6%
1980
16th to endNight
25%6%14%24%19%8%
2112
April1st to 15thNight
24%6%18%25%18%6%
1976
16th to endNight
28%5%13%24%22%5%
1825
May1st to 15thNight
25%7%15%27%17%6%
1726
16th to endNight
29%11%17%24%16%
1684
June1st to 15thNight
45%13%21%16%3
1620
16th to endNight
41%16%21%16%3
1620
July1st to 15thNight
44%17%24%11%2
1530
16th to endNight
41%18%25%14%
1595
August1st to 15thNight
35%18%35%9%
1609
16th to endNight
44%17%27%9%
2056
September1st to 15thNight
45%18%21%12%1
1925
16th to endNight
48%13%19%13%3
1815
October1st to 15thNight
35%8%15%17%18%4
1895
16th to endNight
35%6%11%15%21%9%
2112
November1st to 15thNight
29%6%10%24%20%7%
2101
16th to endNight
34%6%9%21%18%10%
2163
December1st to 15thNight
37%6%13%23%13%6%
2340
16th to endNight
33%7%15%20%16%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%38%17%11%6%
90
16th to endDay
10%13%34%19%17%4
96
February1st to 15thDay
8%12%24%28%17%7%
90
16th to endDay
12%425%36%19%
182
March1st to 15thDay
4424%36%25%4
270
16th to endDay
7%5%22%26%31%7%
288
April1st to 15thDay
3223%30%29%11%
270
16th to endDay
9%112%29%25%22%
270
May1st to 15thDay
5%111%22%37%22%
288
16th to endDay
6%26%19%30%35%
331
June1st to 15thDay
16%18%9%24%39%
315
16th to endDay
7%210%21%57%
315
July1st to 15thDay
7%1419%66%
305
16th to endDay
8%6%9%19%56%
326
August1st to 15thDay
6%29%18%61%
313
16th to endDay
14%49%17%53%
332
September1st to 15thDay
8%1412%18%55%
294
16th to endDay
12%38%28%46%
254
October1st to 15thDay
9%15%28%37%16%
255
16th to endDay
12%19%25%30%12%
272
November1st to 15thDay
7%12%33%32%13%
265
16th to endDay
6%218%37%29%5%
264
December1st to 15thDay
7%6%33%36%14%1
90
16th to endDay
6%214%36%32%8%
96
January1st to 15thNight
11%5%24%37%20%1
720
16th to endNight
12%5%27%39%14%
768
February1st to 15thNight
12%427%41%12%
704
16th to endNight
8%329%45%12%
631
March1st to 15thNight
5%430%41%15%1
720
16th to endNight
6%226%44%20%
768
April1st to 15thNight
4224%45%22%
718
16th to endNight
8%219%46%22%1
720
May1st to 15thNight
7%114%46%26%3
646
16th to endNight
5%7%34%42%9%
563
June1st to 15thNight
10%422%48%12%
540
16th to endNight
7%212%46%30%
540
July1st to 15thNight
10%26%47%33%
510
16th to endNight
4111%43%39%
564
August1st to 15thNight
6%17%48%35%
539
16th to endNight
13%415%39%26%
761
September1st to 15thNight
9%417%44%23%
700
16th to endNight
13%420%44%16%
657
October1st to 15thNight
10%17%33%39%6%
660
16th to endNight
15%14%33%30%5%
704
November1st to 15thNight
6%118%41%28%4
700
16th to endNight
9%222%41%21%1
720
December1st to 15thNight
10%419%39%25%1
720
16th to endNight
7%321%39%26%2
768
Page generated at 2017-09-11 19:35:18. Version ac04

Copyright 2017 A. Danko


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