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 2005-11-05 to 2017-10-06.

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
40%
15980
20%
47242
11%
15941
49%
15941
23%
30020

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
26%
717
21%
2327
10%
716
40%
716
16%
1471
January16th to endNight
26%
768
24%
2496
10%
768
44%
768
21%
1543
February1st to 15thNight
24%
703
20%
2251
8%
701
39%
701
19%
1395
February16th to endNight
25%
631
25%
1875
10%
631
42%
631
21%
1166
March1st to 15thNight
29%
720
23%
1980
13%
720
40%
720
27%
1232
March16th to endNight
29%
768
21%
2103
10%
768
39%
768
25%
1343
April1st to 15thNight
35%
718
23%
1796
9%
718
43%
718
29%
1148
April16th to endNight
41%
720
21%
1800
8%
720
47%
720
30%
1142
May1st to 15thNight
38%
702
16%
1782
7%
702
43%
702
27%
1193
May16th to endNight
52%
561
16%
1683
8%
561
58%
561
24%
1020
June1st to 15thNight
53%
360
15%
1440
16%
360
55%
360
20%
865
June16th to endNight
53%
433
15%
1513
12%
433
58%
433
22%
925
July1st to 15thNight
63%
510
11%
1530
10%
510
64%
510
23%
1016
July16th to endNight
58%
564
10%
1595
7%
531
63%
531
23%
1050
August1st to 15thNight
55%
608
13%
1678
9%
605
57%
605
22%
1153
August16th to endNight
59%
764
15%
1910
8%
764
60%
764
23%
1373
September1st to 15thNight
58%
720
20%
1800
14%
720
60%
720
26%
1255
September16th to endNight
41%
717
14%
1971
8%
717
48%
717
17%
1441
October1st to 15thNight
46%
684
25%
2051
22%
684
53%
684
28%
1262
October16th to endNight
44%
704
32%
2112
22%
704
59%
704
33%
1192
November1st to 15thNight
40%
700
26%
2101
17%
700
52%
700
28%
1256
November16th to endNight
36%
720
25%
2334
15%
720
50%
720
23%
1399
December1st to 15thNight
32%
720
20%
2520
11%
720
45%
720
17%
1557
December16th to endNight
26%
768
21%
2594
10%
768
41%
768
16%
1623

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%244245%6%8%43%
47923
Night
11%5%25%42445%8%44%
47437
Cloud CoverDay
11%5%244345%6%8%44%
47933
Night
11%5%25%42445%8%44%
47441
TransparencyDay
37%9%13%20%15%3
47635
Night
37%7%13%20%16%4
47243
SeeingDay
13%13%20%26%19%7%
5996
Night
12%20%20%26%16%2
15986

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
13%6%24433235%48%
1611
16th to endDay
15%7%24324445%44%
1728
February1st to 15thDay
15%5%24424446%43%
1609
16th to endDay
13%4245%23336%49%
1595
March1st to 15thDay
13%314323347%51%
1969
16th to endDay
14%5%34425%45%7%42%
2121
April1st to 15thDay
9%42432345%7%53%
2152
16th to endDay
9%3135%3446%8%49%
2160
May1st to 15thDay
9%4245%25%5%6%9%42%
2178
16th to endDay
7%3235%36%6%7%9%45%
2431
June1st to 15thDay
9%423435%5%8%11%40%
2517
16th to endDay
7%3145%37%7%8%11%38%
2441
July1st to 15thDay
9%424426%6%8%12%38%
2340
16th to endDay
6%5%35%6%36%7%8%11%35%
2465
August1st to 15thDay
11%5%25%5%45%6%7%11%33%
2259
16th to endDay
9%6%26%6%45%7%8%10%32%
2292
September1st to 15thDay
11%6%25%425%5%6%8%41%
2160
16th to endDay
17%7%35%5%345%5%7%34%
1984
October1st to 15thDay
14%5%25%313345%48%
1707
16th to endDay
10%414312345%57%
1760
November1st to 15thDay
12%413323345%54%
1757
16th to endDay
11%424324347%51%
1621
December1st to 15thDay
13%7%36%32445%6%41%
1440
16th to endDay
16%6%24424335%44%
1626
January1st to 15thNight
11%7%35%42445%6%43%
2327
16th to endNight
15%6%24423446%44%
2496
February1st to 15thNight
16%5%25%33335%5%45%
2250
16th to endNight
12%5%244245%6%6%45%
1875
March1st to 15thNight
12%42332445%6%49%
1968
16th to endNight
12%5%25%325%45%7%46%
2103
April1st to 15thNight
9%5%24424446%50%
1796
16th to endNight
9%4134245%5%8%49%
1800
May1st to 15thNight
8%425%5%35%5%7%9%43%
1782
16th to endNight
9%5%1432446%9%46%
1682
June1st to 15thNight
9%5%235%36%46%9%42%
1440
16th to endNight
8%5%36%326%5%6%13%38%
1513
July1st to 15thNight
5%325%6%37%7%7%12%38%
1620
16th to endNight
4425%6%37%7%9%12%35%
1703
August1st to 15thNight
8%5%26%5%36%6%8%11%34%
1689
16th to endNight
9%426%5%46%6%9%10%33%
1910
September1st to 15thNight
11%424435%6%6%9%40%
1800
16th to endNight
15%7%37%5%35%45%7%33%
1971
October1st to 15thNight
13%5%33323446%49%
2051
16th to endNight
9%5%24412336%55%
2112
November1st to 15thNight
10%5%245%24346%52%
2101
16th to endNight
13%424423347%49%
2334
December1st to 15thNight
13%7%244245%5%7%42%
2520
16th to endNight
14%5%36%42445%6%42%
2594

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
14%5%24433345%48%
1611
16th to endDay
15%6%35%325%346%44%
1728
February1st to 15thDay
14%5%244345%46%43%
1609
16th to endDay
13%425%423346%50%
1595
March1st to 15thDay
12%424313346%51%
1980
16th to endDay
14%5%344345%46%43%
2120
April1st to 15thDay
9%32432346%6%53%
2152
16th to endDay
8%3144345%5%9%50%
2160
May1st to 15thDay
8%4245%35%5%6%8%43%
2178
16th to endDay
7%314436%5%7%10%45%
2431
June1st to 15thDay
8%4245%25%5%8%11%41%
2517
16th to endDay
6%3145%46%6%8%11%39%
2441
July1st to 15thDay
8%424425%6%9%11%39%
2340
16th to endDay
6%435%6%36%7%8%11%36%
2465
August1st to 15thDay
10%6%15%5%36%6%7%11%34%
2259
16th to endDay
9%5%26%6%45%7%8%10%32%
2292
September1st to 15thDay
10%5%35%4345%6%8%41%
2160
16th to endDay
17%7%26%5%35%448%33%
1984
October1st to 15thDay
15%5%24313346%47%
1707
16th to endDay
9%414412346%57%
1760
November1st to 15thDay
12%413423435%54%
1757
16th to endDay
11%43342425%6%50%
1621
December1st to 15thDay
13%7%36%42445%5%42%
1440
16th to endDay
15%6%25%433335%44%
1626
January1st to 15thNight
11%6%36%4235%5%6%43%
2327
16th to endNight
15%6%2442335%6%44%
2496
February1st to 15thNight
16%5%24424345%45%
2243
16th to endNight
12%5%3432445%6%45%
1875
March1st to 15thNight
12%42342436%6%49%
1980
16th to endNight
11%6%24325%45%7%45%
2103
April1st to 15thNight
9%5%24324446%50%
1796
16th to endNight
9%4144235%6%7%50%
1800
May1st to 15thNight
9%424435%5%7%9%43%
1781
16th to endNight
9%5%15%3335%6%9%46%
1682
June1st to 15thNight
8%5%245%35%46%9%42%
1440
16th to endNight
8%5%25%325%5%7%13%38%
1513
July1st to 15thNight
5%325%6%37%6%7%11%38%
1620
16th to endNight
4425%7%46%7%9%12%34%
1703
August1st to 15thNight
8%5%36%6%26%6%8%11%33%
1689
16th to endNight
9%5%26%6%36%6%8%10%33%
1910
September1st to 15thNight
11%5%245%35%6%6%9%39%
1800
16th to endNight
15%8%27%6%35%45%7%33%
1971
October1st to 15thNight
13%6%34323345%48%
2051
16th to endNight
9%5%25%412335%55%
2112
November1st to 15thNight
9%5%24324336%52%
2101
16th to endNight
13%5%23423347%49%
2334
December1st to 15thNight
13%7%25%32445%7%42%
2520
16th to endNight
14%5%35%42445%7%42%
2594

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
39%5%10%16%19%7%
1612
16th to endDay
41%5%6%17%22%6%
1728
February1st to 15thDay
41%37%20%20%5%
1612
16th to endDay
35%5%11%21%20%5%
1595
March1st to 15thDay
33%5%13%21%18%6%
1980
16th to endDay
41%6%11%18%18%4
2121
April1st to 15thDay
29%5%14%24%20%5%
2152
16th to endDay
31%8%13%20%20%6%
2160
May1st to 15thDay
36%9%17%22%12%1
2178
16th to endDay
31%14%15%26%11%
2435
June1st to 15thDay
35%12%16%22%11%
2517
16th to endDay
36%13%19%22%7%
2441
July1st to 15thDay
34%15%22%20%6%1
2201
16th to endDay
37%12%19%23%5%
2310
August1st to 15thDay
42%12%18%17%8%
2246
16th to endDay
43%14%16%19%5%
2292
September1st to 15thDay
39%13%14%15%13%3
2160
16th to endDay
50%8%12%13%13%2
1984
October1st to 15thDay
37%6%9%20%21%2
1707
16th to endDay
29%5%6%24%27%6%
1760
November1st to 15thDay
32%48%18%27%7%
1757
16th to endDay
34%6%8%19%22%8%
1621
December1st to 15thDay
42%7%10%19%14%5%
1440
16th to endDay
42%5%9%19%17%5%
1626
January1st to 15thNight
39%7%10%16%20%6%
2327
16th to endNight
39%47%20%18%8%
2496
February1st to 15thNight
39%5%9%15%22%7%
2251
16th to endNight
37%5%10%19%20%6%
1875
March1st to 15thNight
34%5%10%23%19%5%
1980
16th to endNight
37%5%12%21%17%4
2103
April1st to 15thNight
34%5%12%21%21%5%
1796
16th to endNight
31%7%14%22%16%6%
1800
May1st to 15thNight
35%9%17%22%14%1
1782
16th to endNight
31%9%19%25%12%1
1684
June1st to 15thNight
36%9%20%21%11%
1440
16th to endNight
36%9%20%25%8%
1513
July1st to 15thNight
35%13%21%20%8%
1530
16th to endNight
35%12%22%21%6%
1595
August1st to 15thNight
39%11%20%19%7%1
1678
16th to endNight
40%13%17%22%41
1910
September1st to 15thNight
38%12%16%16%14%2
1800
16th to endNight
49%8%11%15%13%1
1971
October1st to 15thNight
36%5%9%21%21%5%
2051
16th to endNight
31%39%22%25%8%
2112
November1st to 15thNight
34%5%8%17%25%9%
2101
16th to endNight
35%5%8%19%21%8%
2334
December1st to 15thNight
39%6%12%18%17%4
2520
16th to endNight
41%5%11%18%17%5%
2594

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
20%13%37%23%5%
90
16th to endDay
15%22%39%19%11
96
February1st to 15thDay
19%19%45%11%3
126
16th to endDay
9%24%38%22%4
239
March1st to 15thDay
12%22%32%21%10%
270
16th to endDay
18%19%25%26%9%2
288
April1st to 15thDay
12%25%20%21%13%5%
270
16th to endDay
10%13%24%30%14%6%
270
May1st to 15thDay
11%14%29%29%12%3
288
16th to endDay
10%12%15%22%26%11%
331
June1st to 15thDay
10%11%10%30%26%10%
315
16th to endDay
8%11%14%30%27%7%
315
July1st to 15thDay
6%6%10%33%35%7%
305
16th to endDay
9%10%8%28%32%9%
326
August1st to 15thDay
14%7%9%27%28%13%
313
16th to endDay
12%6%9%22%29%19%
332
September1st to 15thDay
13%6%15%27%20%15%
315
16th to endDay
22%7%18%24%17%9%
314
October1st to 15thDay
19%10%19%31%14%5%
278
16th to endDay
8%11%20%30%21%7%
272
November1st to 15thDay
16%14%28%24%12%3
265
16th to endDay
12%19%25%20%19%1
239
December1st to 15thDay
21%11%33%18%13%1
60
16th to endDay
21%8%35%24%8%1
79
January1st to 15thNight
13%31%24%23%6%
720
16th to endNight
13%27%28%26%3
768
February1st to 15thNight
16%28%27%23%3
704
16th to endNight
12%29%29%23%5%
631
March1st to 15thNight
13%25%30%22%8%
720
16th to endNight
14%24%28%23%9%
768
April1st to 15thNight
11%23%27%24%12%
718
16th to endNight
9%21%23%30%13%1
720
May1st to 15thNight
10%19%27%29%12%
702
16th to endNight
9%19%11%26%27%5%
563
June1st to 15thNight
10%17%11%33%21%5%
360
16th to endNight
11%17%11%36%20%2
433
July1st to 15thNight
7%11%8%36%30%5%
510
16th to endNight
6%16%7%32%30%5%
564
August1st to 15thNight
11%10%10%31%30%6%
608
16th to endNight
11%8%9%27%32%10%
764
September1st to 15thNight
12%9%10%27%33%6%
720
16th to endNight
18%11%16%24%23%5%
717
October1st to 15thNight
15%13%19%24%22%4
684
16th to endNight
12%16%23%24%18%4
704
November1st to 15thNight
11%20%25%27%13%2
700
16th to endNight
13%26%20%23%14%1
720
December1st to 15thNight
14%27%20%24%11%1
720
16th to endNight
14%26%26%24%6%
768
Page generated at 2017-10-07 14:07:49. Version ac04

Copyright 2017 A. Danko


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