Fishing Battery Island
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fishing Battery Island clear sky chart from 2005-11-05 to 2017-09-18.

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
34%
15173
20%
46889
10%
15134
45%
15134
22%
29572

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
21%
719
21%
2485
10%
716
37%
716
16%
1550
January16th to endNight
20%
768
23%
2496
7%
768
39%
768
19%
1561
February1st to 15thNight
18%
704
18%
2280
6%
701
34%
701
17%
1437
February16th to endNight
16%
631
25%
1893
5%
631
39%
631
20%
1184
March1st to 15thNight
23%
720
20%
2058
9%
720
36%
720
22%
1310
March16th to endNight
25%
768
21%
2054
8%
768
36%
768
24%
1369
April1st to 15thNight
26%
718
19%
1796
5%
718
33%
718
26%
1198
April16th to endNight
34%
720
19%
1800
5%
720
40%
720
26%
1222
May1st to 15thNight
31%
535
17%
1615
8%
535
39%
535
17%
1081
May16th to endNight
42%
375
17%
1497
12%
374
51%
374
16%
914
June1st to 15thNight
45%
360
18%
1440
17%
360
53%
360
21%
846
June16th to endNight
52%
360
16%
1440
15%
360
60%
360
21%
835
July1st to 15thNight
50%
340
12%
1360
13%
340
54%
340
16%
871
July16th to endNight
58%
467
15%
1502
13%
438
65%
438
28%
869
August1st to 15thNight
57%
563
18%
1633
12%
560
59%
560
28%
1010
August16th to endNight
60%
764
19%
1910
10%
764
62%
764
32%
1249
September1st to 15thNight
52%
720
25%
1800
14%
720
56%
720
32%
1196
September16th to endNight
52%
669
24%
1817
16%
669
58%
669
27%
1188
October1st to 15thNight
42%
660
22%
1980
18%
660
50%
660
25%
1248
October16th to endNight
33%
704
26%
2112
13%
704
50%
704
28%
1246
November1st to 15thNight
30%
700
24%
2277
14%
700
46%
700
24%
1375
November16th to endNight
27%
720
21%
2436
10%
720
42%
720
18%
1493
December1st to 15thNight
21%
720
17%
2520
6%
720
36%
720
15%
1625
December16th to endNight
20%
768
20%
2688
6%
768
38%
768
16%
1695

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
14%4244245%5%7%42%
47903
Night
15%5%2442445%7%43%
47067
Cloud CoverDay
13%5%244345%6%7%43%
47913
Night
14%5%2442445%7%43%
47072
TransparencyDay
39%6%12%23%15%2
47599
Night
39%5%11%22%17%2
46889
SeeingDay
16%14%21%24%16%6%
5724
Night
15%20%23%25%12%1
15174

By Month

Percentage Cloud Cover NE (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
15%6%24434447%42%
1451
16th to endDay
14%7%245%34346%43%
1728
February1st to 15thDay
15%6%15%4345%5%5%41%
1582
16th to endDay
14%7%35%43345%6%41%
1580
March1st to 15thDay
15%5%245%24446%44%
1890
16th to endDay
17%6%14425%446%41%
2169
April1st to 15thDay
15%5%235%24446%44%
2152
16th to endDay
16%42342445%6%45%
2160
May1st to 15thDay
16%5%25%425%45%7%39%
2344
16th to endDay
14%3235%25%5%6%9%40%
2618
June1st to 15thDay
12%324435%6%7%10%39%
2520
16th to endDay
11%3144245%6%9%44%
2520
July1st to 15thDay
7%425%5%246%8%9%42%
2520
16th to endDay
5%3145%35%7%9%12%40%
2561
August1st to 15thDay
11%5%15%435%5%6%10%40%
2304
16th to endDay
10%4135%345%6%9%44%
2292
September1st to 15thDay
14%31442435%6%48%
2160
16th to endDay
15%334434448%43%
1863
October1st to 15thDay
17%41342345%6%45%
1650
16th to endDay
16%423423346%47%
1760
November1st to 15thDay
15%6%13423445%46%
1581
16th to endDay
17%5%34413446%45%
1522
December1st to 15thDay
17%5%2443445%7%41%
1440
16th to endDay
18%6%2443345%6%39%
1536
January1st to 15thNight
17%5%2442435%6%41%
2485
16th to endNight
17%6%14423346%43%
2496
February1st to 15thNight
14%7%25%424446%42%
2278
16th to endNight
15%5%24324345%46%
1893
March1st to 15thNight
17%423324446%45%
2046
16th to endNight
15%6%345%23436%43%
2054
April1st to 15thNight
15%6%2432445%6%44%
1796
16th to endNight
18%423323447%45%
1800
May1st to 15thNight
19%7%24423347%39%
1615
16th to endNight
15%6%2442445%8%41%
1495
June1st to 15thNight
13%425%32435%7%46%
1440
16th to endNight
9%425%5%345%5%10%42%
1440
July1st to 15thNight
9%5%36%6%36%7%7%8%36%
1440
16th to endNight
6%325%426%7%6%11%43%
1605
August1st to 15thNight
9%415%4345%6%9%44%
1644
16th to endNight
11%4245%2446%8%45%
1910
September1st to 15thNight
12%5%25%424447%46%
1800
16th to endNight
13%5%2443435%7%44%
1817
October1st to 15thNight
18%414323346%44%
1980
16th to endNight
16%313314336%51%
2112
November1st to 15thNight
14%5%35%412435%49%
2277
16th to endNight
16%41442445%7%42%
2436
December1st to 15thNight
17%6%35%5%3435%6%38%
2520
16th to endNight
17%6%25%42445%7%40%
2688

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
15%6%2442445%7%41%
1451
16th to endDay
14%7%24434446%43%
1728
February1st to 15thDay
14%6%25%4345%5%5%42%
1582
16th to endDay
13%7%35%32446%6%40%
1580
March1st to 15thDay
14%5%25%424446%44%
1901
16th to endDay
18%4245%25%446%41%
2168
April1st to 15thDay
14%6%24425%446%44%
2152
16th to endDay
15%42432445%6%46%
2160
May1st to 15thDay
15%5%25%4345%5%7%38%
2344
16th to endDay
14%424425%6%6%8%40%
2618
June1st to 15thDay
11%324435%6%7%10%39%
2520
16th to endDay
10%4144345%6%9%45%
2520
July1st to 15thDay
7%425%445%6%7%9%43%
2520
16th to endDay
5%2245%35%7%9%12%41%
2561
August1st to 15thDay
10%5%25%5%345%7%9%41%
2304
16th to endDay
9%4245%245%7%9%44%
2292
September1st to 15thDay
13%315%424447%46%
2160
16th to endDay
14%425%5%34448%42%
1863
October1st to 15thDay
16%42332345%6%46%
1650
16th to endDay
16%414334345%47%
1760
November1st to 15thDay
15%5%233235%46%46%
1581
16th to endDay
16%5%34423446%45%
1522
December1st to 15thDay
17%5%24434447%41%
1440
16th to endDay
18%5%25%42445%6%38%
1536
January1st to 15thNight
17%5%2442335%7%41%
2485
16th to endNight
17%6%235%23446%44%
2496
February1st to 15thNight
14%6%25%424446%42%
2271
16th to endNight
15%6%24324345%46%
1893
March1st to 15thNight
16%5%23423447%45%
2058
16th to endNight
15%6%25%5%23447%42%
2054
April1st to 15thNight
15%6%24324446%43%
1796
16th to endNight
18%5%23323447%44%
1800
May1st to 15thNight
18%7%34424338%38%
1615
16th to endNight
14%6%25%335%35%7%41%
1495
June1st to 15thNight
12%5%34425%35%8%45%
1440
16th to endNight
8%425%6%346%6%10%42%
1440
July1st to 15thNight
8%6%26%6%36%6%6%8%36%
1440
16th to endNight
6%3245%36%6%7%11%42%
1605
August1st to 15thNight
9%4244345%7%9%44%
1644
16th to endNight
10%5%144245%6%8%45%
1910
September1st to 15thNight
12%5%25%43445%7%46%
1800
16th to endNight
13%6%2443335%7%44%
1817
October1st to 15thNight
17%42442435%6%44%
1980
16th to endNight
16%412323346%51%
2112
November1st to 15thNight
14%5%35%313345%49%
2277
16th to endNight
16%415%42445%6%42%
2436
December1st to 15thNight
18%6%25%6%2435%6%38%
2520
16th to endNight
17%5%25%42435%7%40%
2688

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
42%5%15%20%12%4
1452
16th to endDay
41%412%24%13%3
1728
February1st to 15thDay
42%5%11%25%12%2
1584
16th to endDay
42%411%27%12%2
1580
March1st to 15thDay
40%412%24%15%1
1901
16th to endDay
44%5%10%19%17%3
2169
April1st to 15thDay
40%5%10%21%16%4
2152
16th to endDay
39%410%18%21%5%
2160
May1st to 15thDay
43%6%12%19%15%1
2344
16th to endDay
39%7%16%22%12%2
2622
June1st to 15thDay
37%8%13%25%13%1
2520
16th to endDay
33%9%15%22%18%1
2520
July1st to 15thDay
35%8%13%23%14%3
2371
16th to endDay
31%10%16%26%12%2
2401
August1st to 15thDay
37%7%13%22%16%1
2291
16th to endDay
34%7%13%22%17%3
2292
September1st to 15thDay
36%6%11%22%20%3
2160
16th to endDay
39%5%9%20%22%2
1863
October1st to 15thDay
38%5%12%24%17%2
1650
16th to endDay
38%311%26%18%1
1760
November1st to 15thDay
38%413%20%19%3
1581
16th to endDay
40%410%27%14%2
1522
December1st to 15thDay
41%5%15%24%11%2
1440
16th to endDay
45%5%14%21%13%
1536
January1st to 15thNight
42%411%21%16%3
2485
16th to endNight
41%311%26%15%1
2496
February1st to 15thNight
42%413%23%14%2
2280
16th to endNight
39%310%23%19%2
1893
March1st to 15thNight
39%413%25%15%1
2058
16th to endNight
41%411%20%17%3
2054
April1st to 15thNight
40%411%20%19%4
1796
16th to endNight
39%6%9%18%20%6%
1800
May1st to 15thNight
45%5%10%19%16%2
1615
16th to endNight
40%7%14%18%15%3
1497
June1st to 15thNight
37%6%13%24%17%
1440
16th to endNight
35%8%12%25%15%2
1440
July1st to 15thNight
43%8%14%17%11%3
1360
16th to endNight
29%10%18%22%17%1
1502
August1st to 15thNight
34%7%14%22%18%1
1633
16th to endNight
34%7%11%22%19%2
1910
September1st to 15thNight
37%6%9%22%20%3
1800
16th to endNight
38%5%7%20%23%3
1817
October1st to 15thNight
41%311%23%17%2
1980
16th to endNight
34%410%28%20%2
2112
November1st to 15thNight
38%48%23%17%7%
2277
16th to endNight
40%410%25%16%2
2436
December1st to 15thNight
46%412%22%13%1
2520
16th to endNight
42%5%15%22%12%1
2688

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
23%23%39%9%11
63
16th to endDay
19%18%38%19%3
96
February1st to 15thDay
23%25%32%17%1
98
16th to endDay
16%20%41%19%2
239
March1st to 15thDay
16%25%25%25%7%
270
16th to endDay
20%20%31%20%43
288
April1st to 15thDay
20%17%32%18%7%3
270
16th to endDay
20%15%21%25%12%5%
270
May1st to 15thDay
25%20%23%14%11%3
288
16th to endDay
18%11%16%24%21%7%
331
June1st to 15thDay
15%12%20%23%21%7%
315
16th to endDay
12%14%18%31%17%6%
315
July1st to 15thDay
11%7%14%31%27%7%
305
16th to endDay
410%12%29%32%9%
326
August1st to 15thDay
15%7%9%29%25%13%
313
16th to endDay
9%5%7%31%29%16%
332
September1st to 15thDay
12%9%19%21%21%15%
315
16th to endDay
21%7%12%24%21%12%
262
October1st to 15thDay
19%9%20%27%17%7%
255
16th to endDay
13%14%31%25%13%1
272
November1st to 15thDay
16%16%27%21%15%2
235
16th to endDay
18%23%24%21%10%1
142
December1st to 15thDay
20%25%23%15%15%1
60
16th to endDay
32%9%37%14%6%
64
January1st to 15thNight
17%28%28%20%5%
720
16th to endNight
19%25%31%22%1
768
February1st to 15thNight
15%27%33%21%2
704
16th to endNight
16%29%34%17%2
631
March1st to 15thNight
18%25%28%21%5%
720
16th to endNight
16%22%32%21%6%1
768
April1st to 15thNight
16%23%31%23%5%
718
16th to endNight
17%21%21%26%12%
720
May1st to 15thNight
22%21%19%28%7%1
535
16th to endNight
17%19%14%29%18%
375
June1st to 15thNight
13%18%17%29%19%1
360
16th to endNight
6%17%15%43%16%1
360
July1st to 15thNight
10%12%16%33%24%1
340
16th to endNight
5%17%10%35%26%4
467
August1st to 15thNight
11%10%12%35%27%2
563
16th to endNight
13%9%8%34%28%5%
764
September1st to 15thNight
11%10%17%29%28%2
720
16th to endNight
16%11%13%31%22%5%
669
October1st to 15thNight
19%14%19%27%17%2
660
16th to endNight
17%16%28%24%12%
704
November1st to 15thNight
16%20%27%23%11%1
700
16th to endNight
15%26%26%22%7%
720
December1st to 15thNight
19%25%27%18%8%
720
16th to endNight
17%27%30%22%2
768
Page generated at 2017-09-19 07:32:24. Version ac04

Copyright 2017 A. Danko


Fishing Battery Island Clear Sky Chart | Charts Home