Honeymoon Island State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Honeymoon Island State Park clear sky chart from 2005-11-05 to 2018-01-20.

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%
16317
20%
48497
15%
16278
61%
16278
26%
30268

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
39%
776
18%
2522
11%
776
49%
776
21%
1585
January16th to endNight
42%
788
24%
2437
17%
788
51%
788
24%
1514
February1st to 15thNight
44%
701
24%
2103
16%
698
53%
698
28%
1266
February16th to endNight
41%
631
23%
1881
11%
631
53%
631
25%
1148
March1st to 15thNight
47%
720
28%
1980
15%
720
57%
720
33%
1160
March16th to endNight
52%
768
27%
2112
17%
768
60%
768
33%
1232
April1st to 15thNight
57%
718
22%
1976
16%
718
61%
718
35%
1129
April16th to endNight
53%
672
27%
1854
17%
672
61%
672
33%
1069
May1st to 15thNight
63%
539
26%
1619
19%
539
67%
539
37%
866
May16th to endNight
65%
561
23%
1683
17%
561
71%
561
31%
974
June1st to 15thNight
60%
540
13%
1620
11%
540
61%
540
21%
1094
June16th to endNight
65%
540
10%
1620
8%
540
66%
540
21%
1100
July1st to 15thNight
66%
510
7%
1530
6%
510
67%
510
21%
1088
July16th to endNight
66%
564
7%
1595
6%
531
70%
531
19%
1147
August1st to 15thNight
69%
539
4%
1705
5%
536
70%
536
20%
1170
August16th to endNight
67%
673
9%
2010
10%
673
67%
673
20%
1436
September1st to 15thNight
62%
720
7%
1980
7%
720
62%
720
17%
1493
September16th to endNight
59%
717
15%
1980
11%
717
63%
717
21%
1398
October1st to 15thNight
65%
720
25%
1995
23%
720
68%
720
31%
1235
October16th to endNight
56%
768
28%
2304
24%
768
64%
768
31%
1355
November1st to 15thNight
59%
760
29%
2281
27%
760
65%
760
36%
1258
November16th to endNight
50%
780
28%
2471
21%
780
61%
780
30%
1434
December1st to 15thNight
51%
780
24%
2535
22%
780
58%
780
27%
1505
December16th to endNight
52%
832
23%
2704
19%
832
59%
832
25%
1612

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
7%425%5%35%6%7%10%41%
49010
Night
7%425%5%35%5%6%9%44%
48705
TransparencyDay
35%11%16%17%13%4
48711
Night
33%9%16%20%15%5%
48508
SeeingDay
8%8%10%21%28%22%
6131
Night
8%15%12%27%26%9%
16327

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%6%26%43446%10%40%
1746
16th to endDay
10%5%244235%6%6%48%
1888
February1st to 15thDay
12%43432445%6%46%
1750
16th to endDay
7%42442435%6%53%
1592
March1st to 15thDay
5%2134245%6%9%54%
1980
16th to endDay
7%3243245%5%7%53%
2111
April1st to 15thDay
5%313425%5%6%10%50%
1972
16th to endDay
5%31342345%9%55%
2112
May1st to 15thDay
5%21232446%8%58%
2331
16th to endDay
5%2145%35%5%7%11%46%
2431
June1st to 15thDay
10%5%15%5%37%7%8%13%32%
2340
16th to endDay
6%425%6%46%7%9%13%32%
2340
July1st to 15thDay
6%425%7%5%8%10%11%14%23%
2340
16th to endDay
5%337%9%5%8%10%11%12%22%
2465
August1st to 15thDay
6%426%6%5%9%10%10%12%24%
2240
16th to endDay
8%426%8%5%8%8%9%11%26%
2178
September1st to 15thDay
8%436%6%5%7%7%10%13%25%
1980
16th to endDay
8%6%37%7%47%8%9%10%28%
1980
October1st to 15thDay
6%315%6%35%7%7%9%43%
1963
16th to endDay
8%425%32345%8%49%
1920
November1st to 15thDay
5%4133245%5%8%53%
1907
16th to endDay
7%4244245%6%7%50%
1817
December1st to 15thDay
7%5%3442446%8%45%
1755
16th to endDay
6%3244345%6%9%47%
1872
January1st to 15thNight
9%7%36%5%335%6%9%38%
2522
16th to endNight
12%5%2442445%8%44%
2437
February1st to 15thNight
10%6%34313346%50%
2103
16th to endNight
7%6%26%424448%47%
1881
March1st to 15thNight
5%424425%45%8%52%
1980
16th to endNight
5%42343345%7%54%
2112
April1st to 15thNight
5%314325%46%10%52%
1976
16th to endNight
5%3245%2445%6%55%
1854
May1st to 15thNight
332341445%9%57%
1619
16th to endNight
4323335%46%9%52%
1682
June1st to 15thNight
10%425%5%245%7%11%38%
1620
16th to endNight
5%3246%37%6%9%13%37%
1620
July1st to 15thNight
5%425%6%5%7%6%9%14%33%
1620
16th to endNight
4425%7%47%9%9%15%29%
1703
August1st to 15thNight
5%315%6%46%8%9%16%32%
1716
16th to endNight
8%426%5%47%6%9%12%33%
2010
September1st to 15thNight
7%6%37%7%5%7%8%9%10%26%
1980
16th to endNight
7%6%37%7%36%5%6%11%33%
1980
October1st to 15thNight
6%4245%25%5%7%9%47%
1995
16th to endNight
8%5%25%423447%49%
2304
November1st to 15thNight
6%324434348%54%
2281
16th to endNight
7%424425%5%5%9%48%
2471
December1st to 15thNight
9%424425%45%9%45%
2535
16th to endNight
6%435%5%45%46%8%44%
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
38%6%12%20%17%4
1747
16th to endDay
33%6%9%18%24%7%
1888
February1st to 15thDay
36%49%14%21%12%
1752
16th to endDay
29%6%14%16%21%11%
1592
March1st to 15thDay
25%6%15%24%21%7%
1980
16th to endDay
29%7%12%22%20%8%
2112
April1st to 15thDay
27%8%15%18%21%6%
1972
16th to endDay
26%7%12%22%25%5%
2112
May1st to 15thDay
22%7%16%25%19%7%
2331
16th to endDay
32%9%16%23%16%2
2435
June1st to 15thDay
40%14%20%18%5%
2340
16th to endDay
41%17%22%15%3
2340
July1st to 15thDay
45%21%24%7%1
2201
16th to endDay
45%21%21%10%1
2310
August1st to 15thDay
44%21%25%8%
2227
16th to endDay
47%18%22%11%
2178
September1st to 15thDay
44%19%20%11%2
1980
16th to endDay
45%14%15%17%5%1
1980
October1st to 15thDay
35%9%12%17%15%9%
1963
16th to endDay
32%5%10%16%22%12%
1920
November1st to 15thDay
28%5%11%25%22%7%
1907
16th to endDay
31%7%11%19%19%10%
1817
December1st to 15thDay
35%6%13%22%17%4
1755
16th to endDay
31%6%14%21%18%5%
1872
January1st to 15thNight
40%6%12%21%16%3
2522
16th to endNight
38%5%10%17%20%7%
2437
February1st to 15thNight
34%5%9%16%23%11%
2112
16th to endNight
35%5%12%16%22%7%
1881
March1st to 15thNight
29%5%13%26%18%6%
1980
16th to endNight
27%6%11%26%19%8%
2112
April1st to 15thNight
26%6%17%23%21%5%
1976
16th to endNight
28%5%12%24%23%5%
1854
May1st to 15thNight
23%5%14%30%18%7%
1620
16th to endNight
25%10%19%24%17%2
1684
June1st to 15thNight
37%12%21%21%6%
1620
16th to endNight
34%15%24%20%4
1620
July1st to 15thNight
39%15%32%10%2
1530
16th to endNight
36%20%29%13%1
1595
August1st to 15thNight
33%19%36%10%
1705
16th to endNight
39%16%26%15%1
2010
September1st to 15thNight
44%17%22%12%2
1980
16th to endNight
41%12%19%18%5%2
1980
October1st to 15thNight
30%10%13%19%19%7%
1995
16th to endNight
33%49%17%24%9%
2304
November1st to 15thNight
27%5%10%24%24%7%
2281
16th to endNight
31%6%10%21%18%11%
2471
December1st to 15thNight
34%6%12%26%15%4
2535
16th to endNight
34%7%14%21%15%6%
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
12%9%28%28%17%2
135
16th to endDay
12%11%28%33%12%
109
February1st to 15thDay
10%6%30%23%25%4
90
16th to endDay
6%337%33%19%
93
March1st to 15thDay
7%15%21%38%14%2
270
16th to endDay
8%15%17%29%23%5%
288
April1st to 15thDay
6%11%20%30%26%4
270
16th to endDay
5%12%11%29%32%8%
270
May1st to 15thDay
6%11%10%29%29%12%
288
16th to endDay
410%6%14%36%27%
331
June1st to 15thDay
13%9%310%30%32%
315
16th to endDay
6%9%17%27%47%
315
July1st to 15thDay
6%6%420%61%
305
16th to endDay
11%9%39%24%41%
326
August1st to 15thDay
9%5%2426%51%
313
16th to endDay
10%438%32%40%
332
September1st to 15thDay
13%5%311%33%32%
315
16th to endDay
10%6%313%38%27%
314
October1st to 15thDay
9%6%9%23%40%11%
315
16th to endDay
11%7%13%34%25%7%
336
November1st to 15thDay
5%9%10%32%34%8%
325
16th to endDay
7%5%11%40%31%3
197
December1st to 15thDay
5%328%42%18%2
135
16th to endDay
329%38%38%7%
144
January1st to 15thNight
11%20%21%28%17%
780
16th to endNight
12%20%20%30%15%
788
February1st to 15thNight
10%20%19%33%14%
704
16th to endNight
9%19%23%34%12%
631
March1st to 15thNight
6%19%21%35%15%
720
16th to endNight
7%18%18%33%19%1
768
April1st to 15thNight
5%18%13%39%20%1
718
16th to endNight
8%18%14%33%25%
672
May1st to 15thNight
5%17%8%36%27%5%
540
16th to endNight
417%6%26%36%9%
563
June1st to 15thNight
9%17%414%38%17%
540
16th to endNight
5%16%29%33%32%
540
July1st to 15thNight
5%12%15%30%44%
510
16th to endNight
416%18%32%37%
564
August1st to 15thNight
5%9%25%38%38%
539
16th to endNight
9%8%212%38%28%
673
September1st to 15thNight
9%8%5%17%37%22%
720
16th to endNight
9%8%5%22%41%11%
717
October1st to 15thNight
8%9%9%32%33%6%
720
16th to endNight
10%10%16%31%28%2
768
November1st to 15thNight
6%14%14%38%22%3
760
16th to endNight
6%16%19%35%19%2
780
December1st to 15thNight
8%17%16%31%24%1
780
16th to endNight
7%17%15%31%25%1
832
Page generated at 2018-01-21 12:19:34. Version ac04

Copyright 2018 A. Danko


Honeymoon Island State Park Clear Sky Chart |Charts Home