Hammocks Beach State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hammocks Beach State Park clear sky chart from 2005-11-06 to 2024-01-16.

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
47%
24468
20%
74710
13%
24416
54%
24416
26%
47011

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 10thNight
28%
758
23%
2459
10%
757
43%
757
22%
1482
January11th to 20thNight
36%
744
24%
2417
13%
744
51%
744
22%
1513
January21st to endNight
29%
792
25%
2574
12%
792
46%
792
24%
1567
February1st to 10thNight
30%
720
18%
2340
11%
720
41%
720
23%
1465
February11th to 20thNight
25%
702
20%
2129
8%
700
40%
700
21%
1399
February21st to endNight
29%
592
22%
1750
11%
592
42%
592
22%
1142
March1st to 10thNight
33%
720
25%
1980
14%
720
45%
720
33%
1209
March11th to 20thNight
34%
720
18%
1980
11%
720
42%
720
23%
1355
March21st to endNight
37%
792
22%
2165
11%
792
47%
792
29%
1376
April1st to 10thNight
38%
720
23%
1800
9%
720
46%
720
33%
1148
April11th to 20thNight
45%
711
23%
1775
11%
711
51%
711
34%
1141
April21st to endNight
51%
720
26%
1800
12%
720
55%
720
41%
1082
May1st to 10thNight
46%
720
17%
1800
8%
720
49%
720
33%
1179
May11th to 20thNight
52%
596
15%
1657
9%
596
55%
596
28%
1095
May21st to endNight
66%
582
14%
1744
12%
582
68%
582
30%
1080
June1st to 10thNight
59%
360
15%
1440
19%
360
59%
360
20%
899
June11th to 20thNight
68%
360
16%
1440
19%
360
68%
360
24%
838
June21st to endNight
65%
470
15%
1550
14%
470
67%
470
24%
1000
July1st to 10thNight
70%
525
11%
1575
10%
525
71%
525
25%
1064
July11th to 20thNight
72%
522
11%
1566
10%
522
72%
522
26%
1024
July21st to endNight
70%
591
12%
1672
10%
558
71%
558
24%
1115
August1st to 10thNight
65%
549
9%
1612
7%
546
65%
546
24%
1090
August11th to 20thNight
65%
710
14%
1774
8%
710
66%
710
25%
1275
August21st to endNight
65%
792
12%
1980
8%
792
65%
792
25%
1422
September1st to 10thNight
66%
720
18%
1800
13%
720
67%
720
30%
1229
September11th to 20thNight
58%
720
20%
1800
15%
720
60%
720
26%
1274
September21st to endNight
51%
720
16%
2056
14%
720
54%
720
22%
1446
October1st to 10thNight
54%
720
22%
2160
22%
720
58%
720
30%
1354
October11th to 20thNight
53%
720
27%
2160
23%
720
61%
720
32%
1269
October21st to endNight
51%
792
29%
2376
23%
792
61%
792
35%
1336
November1st to 10thNight
48%
740
24%
2221
19%
740
56%
740
30%
1357
November11th to 20thNight
39%
760
25%
2365
16%
760
51%
760
26%
1454
November21st to endNight
43%
760
25%
2470
17%
760
55%
760
29%
1427
December1st to 10thNight
35%
760
20%
2660
10%
760
49%
760
20%
1692
December11th to 20thNight
37%
760
23%
3177
17%
758
49%
758
21%
1801
December21st to endNight
33%
828
16%
4486
11%
817
46%
817
15%
2412

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
11%5%25%5%35%5%6%8%44%
74611
Night
12%6%35%5%345%6%8%44%
75169
TransparencyDay
37%9%14%20%16%4
74332
Night
37%8%13%20%17%4
74967
SeeingDay
13%8%25%28%20%6%
14388
Night
14%8%24%31%20%4
24481

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 10thDay
13%6%245%34445%50%
1706
11th to 20thDay
13%6%35%5%35%45%6%45%
1671
21st to endDay
16%7%35%435%346%45%
1782
February1st to 10thDay
15%5%26%5%345%5%7%42%
1620
11th to 20thDay
19%6%34434435%46%
1717
21st to endDay
15%7%26%5%2345%7%43%
1502
March1st to 10thDay
13%5%245%23346%53%
1980
11th to 20thDay
13%5%35%5%35%5%5%8%43%
1980
21st to endDay
14%6%35%5%345%5%6%43%
2190
April1st to 10thDay
11%4244235%5%6%54%
2160
11th to 20thDay
9%3244345%6%8%53%
2134
21st to endDay
9%4145%3345%9%54%
2160
May1st to 10thDay
8%424435%5%7%9%49%
2160
11th to 20thDay
12%5%25%5%46%5%7%9%41%
2250
21st to endDay
8%425%446%7%8%11%42%
2531
June1st to 10thDay
9%6%36%6%36%6%8%10%37%
2515
11th to 20thDay
9%324435%6%9%13%41%
2520
21st to endDay
7%425%5%5%6%7%9%12%37%
2401
July1st to 10thDay
8%5%36%5%35%6%9%13%38%
2340
11th to 20thDay
8%5%25%436%6%8%11%40%
2340
21st to endDay
7%5%36%7%35%7%8%12%36%
2547
August1st to 10thDay
10%6%26%6%45%6%8%12%33%
2297
11th to 20thDay
9%6%26%5%46%6%8%11%38%
2126
21st to endDay
9%6%26%7%45%7%8%10%34%
2376
September1st to 10thDay
9%6%35%4346%7%10%41%
2160
11th to 20thDay
13%6%36%5%45%5%6%8%39%
2160
21st to endDay
17%6%36%436%45%8%39%
1897
October1st to 10thDay
14%5%36%5%2445%7%45%
1800
11th to 20thDay
9%425%424447%56%
1800
21st to endDay
10%5%245%23446%55%
1980
November1st to 10thDay
13%423424446%53%
1857
11th to 20thDay
12%5%35%5%25%445%52%
1810
21st to endDay
11%4345%3435%8%49%
1707
December1st to 10thDay
15%7%36%5%35%5%6%8%39%
1520
11th to 20thDay
15%5%2442333453%
1910
21st to endDay
12%9%35%5%34347%44%
3005
January1st to 10thNight
12%6%36%42345%7%47%
2459
11th to 20thNight
12%6%35%5%345%5%8%43%
2417
21st to endNight
15%6%35%5%3345%6%45%
2574
February1st to 10thNight
19%6%2442445%6%43%
2340
11th to 20thNight
17%8%35%43445%6%42%
2127
21st to endNight
16%6%45%435%5%6%6%41%
1750
March1st to 10thNight
13%5%2342446%6%52%
1980
11th to 20thNight
13%7%35%5%36%5%7%7%38%
1980
21st to endNight
12%6%35%4345%5%8%46%
2165
April1st to 10thNight
11%5%35%43445%7%50%
1800
11th to 20thNight
9%5%36%43445%6%50%
1775
21st to endNight
8%3144245%6%7%56%
1800
May1st to 10thNight
8%5%25%5%35%5%7%10%46%
1800
11th to 20thNight
12%5%25%435%6%6%10%42%
1657
21st to endNight
9%5%25%5%445%7%11%44%
1744
June1st to 10thNight
10%6%35%7%46%5%6%9%39%
1440
11th to 20thNight
8%5%24435%5%8%12%42%
1440
21st to endNight
9%5%26%5%46%7%8%12%36%
1550
July1st to 10thNight
6%425%7%48%6%8%12%36%
1620
11th to 20thNight
5%426%6%26%7%9%12%38%
1620
21st to endNight
6%5%26%6%5%7%7%9%12%35%
1771
August1st to 10thNight
8%5%36%6%36%7%9%12%35%
1623
11th to 20thNight
9%426%7%46%7%8%10%36%
1774
21st to endNight
10%6%26%6%36%6%8%12%34%
1980
September1st to 10thNight
11%425%5%35%7%7%10%41%
1800
11th to 20thNight
11%7%27%7%45%5%6%9%39%
1800
21st to endNight
16%8%37%5%35%5%6%7%36%
2056
October1st to 10thNight
11%7%45%5%3445%7%46%
2160
11th to 20thNight
10%5%35%43335%6%52%
2160
21st to endNight
9%5%25%423446%55%
2376
November1st to 10thNight
12%5%25%5%24446%50%
2221
11th to 20thNight
12%7%35%5%33346%48%
2365
21st to endNight
11%5%245%3445%8%50%
2470
December1st to 10thNight
15%8%25%5%345%5%7%42%
2660
11th to 20thNight
14%7%24434446%48%
3285
21st to endNight
14%6%35%424447%47%
4630

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 10thDay
36%5%11%19%22%6%
1707
11th to 20thDay
40%6%9%17%22%6%
1671
21st to endDay
41%47%18%23%6%
1782
February1st to 10thDay
42%5%10%21%17%5%
1620
11th to 20thDay
43%5%8%16%22%7%
1726
21st to endDay
40%6%12%18%16%8%
1502
March1st to 10thDay
34%5%11%19%23%8%
1980
11th to 20thDay
39%8%13%19%16%5%
1980
21st to endDay
41%7%12%17%19%4
2190
April1st to 10thDay
30%6%13%23%22%7%
2160
11th to 20thDay
29%7%14%23%19%8%
2134
21st to endDay
29%7%14%24%22%4
2160
May1st to 10thDay
30%9%19%25%14%3
2160
11th to 20thDay
37%11%15%25%11%1
2254
21st to endDay
33%15%16%26%10%1
2531
June1st to 10thDay
40%12%15%21%11%1
2515
11th to 20thDay
31%14%22%23%10%1
2520
21st to endDay
36%15%19%21%8%
2401
July1st to 10thDay
36%15%22%19%7%1
2275
11th to 20thDay
33%16%23%20%7%
2271
21st to endDay
36%13%22%25%4
2405
August1st to 10thDay
40%13%24%17%5%
2284
11th to 20thDay
39%15%20%18%8%
2126
21st to endDay
41%14%19%19%6%1
2376
September1st to 10thDay
36%15%18%15%13%3
2160
11th to 20thDay
42%11%13%17%15%3
2160
21st to endDay
44%8%13%18%14%3
1897
October1st to 10thDay
39%6%10%20%23%2
1800
11th to 20thDay
29%7%10%25%22%7%
1800
21st to endDay
31%6%8%21%28%7%
1980
November1st to 10thDay
32%7%8%19%27%7%
1857
11th to 20thDay
36%6%8%18%24%8%
1810
21st to endDay
34%7%10%21%22%6%
1707
December1st to 10thDay
43%8%11%19%13%5%
1520
11th to 20thDay
36%47%20%24%9%
1906
21st to endDay
41%5%11%19%21%2
3005
January1st to 10thNight
37%6%10%21%20%6%
2459
11th to 20thNight
39%7%10%20%18%6%
2417
21st to endNight
39%48%20%22%7%
2574
February1st to 10thNight
42%5%10%17%20%7%
2340
11th to 20thNight
44%5%9%16%20%7%
2129
21st to endNight
43%5%11%16%17%8%
1750
March1st to 10thNight
33%6%9%22%22%8%
1980
11th to 20thNight
43%7%11%17%16%6%
1980
21st to endNight
37%6%14%22%17%5%
2165
April1st to 10thNight
34%6%13%17%25%6%
1800
11th to 20thNight
35%5%13%22%18%7%
1775
21st to endNight
26%8%15%29%19%4
1800
May1st to 10thNight
32%10%16%23%17%3
1800
11th to 20thNight
38%8%17%23%13%1
1658
21st to endNight
32%11%21%23%12%1
1745
June1st to 10thNight
41%9%18%22%10%1
1440
11th to 20thNight
33%11%21%25%9%1
1440
21st to endNight
39%10%19%24%8%
1550
July1st to 10thNight
37%13%22%18%9%1
1575
11th to 20thNight
32%16%26%20%6%
1566
21st to endNight
37%13%22%23%5%1
1672
August1st to 10thNight
37%14%26%19%3
1612
11th to 20thNight
40%14%20%19%7%1
1774
21st to endNight
39%14%20%20%6%1
1980
September1st to 10thNight
36%12%22%16%13%2
1800
11th to 20thNight
41%11%12%20%14%3
1800
21st to endNight
46%8%12%19%14%1
2056
October1st to 10thNight
38%5%11%21%21%4
2160
11th to 20thNight
33%5%9%23%23%6%
2160
21st to endNight
31%410%22%25%8%
2376
November1st to 10thNight
35%7%10%16%25%8%
2221
11th to 20thNight
38%5%8%16%24%8%
2365
21st to endNight
33%6%9%22%23%6%
2470
December1st to 10thNight
41%8%12%17%17%5%
2660
11th to 20thNight
37%49%19%24%7%
3288
21st to endNight
39%49%22%23%3
4630

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 10thDay
18%19%42%17%4
270
11th to 20thDay
13%17%38%27%5%
257
21st to endDay
19%19%34%22%5%1
264
February1st to 10thDay
21%13%35%25%5%
240
11th to 20thDay
27%14%37%18%4
385
21st to endDay
16%17%40%20%6%1
346
March1st to 10thDay
13%16%38%24%9%
420
11th to 20thDay
17%18%35%22%7%1
420
21st to endDay
16%14%36%23%10%2
462
April1st to 10thDay
15%17%32%25%10%2
420
11th to 20thDay
11%11%30%28%17%4
412
21st to endDay
10%10%32%29%17%3
420
May1st to 10thDay
9%13%31%28%14%4
423
11th to 20thDay
14%422%34%20%6%
447
21st to endDay
11%317%28%29%12%
485
June1st to 10thDay
10%320%38%24%6%
450
11th to 20thDay
11%417%29%27%13%
450
21st to endDay
8%315%37%27%10%
450
July1st to 10thDay
11%211%28%38%11%
445
11th to 20thDay
9%19%30%38%12%
444
21st to endDay
9%114%33%35%7%
488
August1st to 10thDay
13%214%28%31%12%
446
11th to 20thDay
12%29%27%35%16%
439
21st to endDay
9%312%29%31%16%
495
September1st to 10thDay
10%214%29%32%13%
450
11th to 20thDay
15%317%31%26%8%
450
21st to endDay
18%418%28%23%10%
450
October1st to 10thDay
18%6%20%27%21%8%
450
11th to 20thDay
10%425%34%21%6%
450
21st to endDay
10%9%24%31%22%4
495
November1st to 10thDay
16%9%27%29%16%3
455
11th to 20thDay
14%12%35%28%9%1
418
21st to endDay
11%12%29%26%19%2
367
December1st to 10thDay
16%9%44%22%8%
180
11th to 20thDay
19%13%32%23%12%1
180
21st to endDay
18%13%34%21%12%2
265
January1st to 10thNight
16%18%33%26%7%1
760
11th to 20thNight
15%15%28%33%9%
744
21st to endNight
16%15%36%29%3
792
February1st to 10thNight
22%10%34%28%6%
720
11th to 20thNight
22%14%36%25%4
703
21st to endNight
20%12%33%27%8%
592
March1st to 10thNight
16%11%37%28%8%
720
11th to 20thNight
16%11%33%29%9%1
720
21st to endNight
15%11%33%30%11%1
792
April1st to 10thNight
14%11%33%30%11%1
720
11th to 20thNight
11%10%29%32%16%2
711
21st to endNight
10%6%29%38%15%1
720
May1st to 10thNight
10%9%30%36%14%1
720
11th to 20thNight
14%422%38%20%2
596
21st to endNight
10%311%32%34%10%
584
June1st to 10thNight
13%213%43%24%4
360
11th to 20thNight
10%213%35%33%8%
360
21st to endNight
11%212%37%33%4
470
July1st to 10thNight
6%210%34%41%7%
525
11th to 20thNight
6%17%32%44%9%
522
21st to endNight
7%19%41%35%7%
591
August1st to 10thNight
10%110%28%42%9%
549
11th to 20thNight
11%110%33%35%10%
710
21st to endNight
13%29%27%38%12%
792
September1st to 10thNight
12%110%27%37%12%
720
11th to 20thNight
14%214%33%29%7%
720
21st to endNight
21%315%26%28%7%
720
October1st to 10thNight
14%420%29%26%7%
720
11th to 20thNight
12%6%23%33%22%4
720
21st to endNight
12%7%25%31%20%4
792
November1st to 10thNight
15%7%24%35%16%3
740
11th to 20thNight
15%11%31%28%15%2
760
21st to endNight
14%10%29%29%17%2
760
December1st to 10thNight
18%14%28%29%10%1
760
11th to 20thNight
16%12%29%30%12%1
760
21st to endNight
18%12%31%29%10%
836
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