Hunting Island State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hunting Island State Park clear sky chart from 2005-11-06 to 2024-01-13.

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
56%
24507
20%
74369
15%
24453
61%
24453
27%
47066

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
38%
757
22%
2459
12%
757
51%
757
24%
1499
January11th to 20thNight
43%
732
24%
2378
16%
732
55%
732
25%
1448
January21st to endNight
33%
792
22%
2574
12%
792
47%
792
24%
1605
February1st to 10thNight
41%
720
20%
2322
15%
720
49%
720
24%
1460
February11th to 20thNight
41%
703
20%
2098
10%
699
53%
699
25%
1331
February21st to endNight
43%
592
23%
1656
15%
592
50%
592
27%
1082
March1st to 10thNight
50%
720
29%
1980
20%
720
58%
720
36%
1194
March11th to 20thNight
49%
720
21%
1980
13%
720
56%
720
30%
1274
March21st to endNight
49%
792
23%
2178
14%
792
57%
792
32%
1355
April1st to 10thNight
54%
720
24%
1980
16%
720
59%
720
34%
1210
April11th to 20thNight
57%
711
25%
1785
14%
711
61%
711
38%
1120
April21st to endNight
64%
720
29%
1800
18%
720
68%
720
45%
1066
May1st to 10thNight
63%
567
24%
1647
16%
567
66%
567
40%
920
May11th to 20thNight
68%
531
18%
1593
13%
531
69%
531
32%
963
May21st to endNight
70%
582
19%
1744
16%
582
71%
582
29%
1092
June1st to 10thNight
68%
540
15%
1620
13%
540
68%
540
26%
1069
June11th to 20thNight
73%
540
12%
1620
10%
540
73%
540
27%
1058
June21st to endNight
74%
540
11%
1620
9%
540
75%
540
23%
1099
July1st to 10thNight
70%
525
12%
1575
10%
525
70%
525
25%
1023
July11th to 20thNight
70%
522
10%
1566
9%
522
70%
522
23%
1069
July21st to endNight
73%
591
12%
1672
10%
558
75%
558
27%
1089
August1st to 10thNight
72%
537
11%
1600
11%
534
72%
534
22%
1086
August11th to 20thNight
69%
560
10%
1624
9%
560
69%
560
18%
1173
August21st to endNight
63%
792
12%
1980
10%
792
63%
792
20%
1519
September1st to 10thNight
68%
720
15%
1955
13%
720
68%
720
24%
1371
September11th to 20thNight
62%
720
14%
1980
13%
720
62%
720
23%
1404
September21st to endNight
58%
720
17%
1980
16%
720
60%
720
24%
1393
October1st to 10thNight
58%
720
23%
2101
22%
720
62%
720
29%
1337
October11th to 20thNight
65%
720
29%
2160
28%
720
70%
720
38%
1218
October21st to endNight
58%
792
30%
2376
26%
792
66%
792
36%
1350
November1st to 10thNight
57%
740
28%
2221
24%
740
64%
740
36%
1287
November11th to 20thNight
46%
760
28%
2280
21%
760
55%
760
30%
1394
November21st to endNight
50%
760
24%
2450
20%
760
58%
760
27%
1480
December1st to 10thNight
45%
760
22%
2470
15%
760
55%
760
23%
1573
December11th to 20thNight
43%
759
24%
2927
17%
758
52%
758
22%
1732
December21st to endNight
40%
830
15%
4418
16%
817
48%
817
13%
2723

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
10%5%25%5%35%5%6%9%45%
74941
Night
11%5%35%5%35%5%6%8%44%
74806
TransparencyDay
35%9%16%21%15%4
74664
Night
37%8%14%19%16%6%
74602
SeeingDay
11%416%27%30%13%
14376
Night
12%5%19%29%27%8%
24519

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
12%5%25%5%35%45%9%45%
1706
11th to 20thDay
11%6%25%5%345%6%8%45%
1638
21st to endDay
16%7%35%423347%45%
1782
February1st to 10thDay
15%7%36%5%4446%6%41%
1634
11th to 20thDay
16%6%2443445%6%47%
1748
21st to endDay
13%5%37%5%245%5%6%45%
1598
March1st to 10thDay
11%42432346%7%53%
1980
11th to 20thDay
11%5%245%345%6%8%48%
1980
21st to endDay
10%5%344346%6%7%49%
2178
April1st to 10thDay
8%3235%345%6%9%52%
1980
11th to 20thDay
10%424435%448%52%
2123
21st to endDay
431342445%8%61%
2160
May1st to 10thDay
6%414325%5%6%10%53%
2327
11th to 20thDay
8%5%35%435%5%6%8%49%
2301
21st to endDay
8%4245%46%5%7%11%44%
2531
June1st to 10thDay
7%5%35%6%46%6%8%13%37%
2340
11th to 20thDay
6%435%6%45%7%7%11%44%
2340
21st to endDay
6%5%25%5%36%8%10%14%37%
2340
July1st to 10thDay
7%4245%46%6%9%14%40%
2340
11th to 20thDay
7%5%25%6%46%7%9%13%35%
2340
21st to endDay
7%5%246%46%7%8%13%37%
2547
August1st to 10thDay
9%415%6%47%8%9%13%34%
2327
11th to 20thDay
7%5%26%7%5%6%7%9%12%34%
2256
21st to endDay
13%8%36%6%36%7%7%11%30%
2376
September1st to 10thDay
11%5%346%45%6%7%10%38%
1999
11th to 20thDay
12%6%36%6%45%6%6%8%39%
1980
21st to endDay
14%5%26%5%35%6%6%8%40%
1980
October1st to 10thDay
12%5%25%5%345%5%7%48%
1859
11th to 20thDay
9%423323446%61%
1800
21st to endDay
9%6%24324446%54%
1980
November1st to 10thDay
10%4345%2345%6%54%
1857
11th to 20thDay
13%6%24424445%52%
1900
21st to endDay
13%4245%2445%5%52%
1727
December1st to 10thDay
11%6%35%5%35%5%5%8%45%
1710
11th to 20thDay
15%5%24423346%52%
2153
21st to endDay
14%9%35%5%3445%6%44%
3124
January1st to 10thNight
11%5%36%6%445%6%7%45%
2459
11th to 20thNight
11%5%36%5%35%45%6%46%
2378
21st to endNight
15%6%35%424446%44%
2574
February1st to 10thNight
14%6%35%6%25%45%6%44%
2322
11th to 20thNight
14%7%35%42446%6%45%
2098
21st to endNight
13%6%37%5%25%5%46%44%
1656
March1st to 10thNight
9%4245%35%45%6%52%
1980
11th to 20thNight
11%6%25%5%3445%8%47%
1980
21st to endNight
10%5%25%5%34448%49%
2178
April1st to 10thNight
9%425%435%45%7%52%
1980
11th to 20thNight
11%4244345%47%52%
1785
21st to endNight
6%42433446%8%56%
1800
May1st to 10thNight
6%324335%46%7%56%
1647
11th to 20thNight
7%4245%25%5%7%9%50%
1592
21st to endNight
8%5%345%35%7%8%9%44%
1744
June1st to 10thNight
9%5%25%6%47%7%9%12%35%
1620
11th to 20thNight
6%5%35%6%47%8%9%11%38%
1620
21st to endNight
5%3247%48%9%10%13%35%
1620
July1st to 10thNight
8%436%6%5%6%6%7%15%36%
1620
11th to 20thNight
7%5%26%7%46%8%8%12%34%
1620
21st to endNight
6%325%6%47%8%9%12%36%
1771
August1st to 10thNight
6%6%25%5%47%8%10%16%31%
1611
11th to 20thNight
8%5%27%8%5%7%7%10%13%29%
1624
21st to endNight
11%8%37%7%47%6%7%10%29%
1980
September1st to 10thNight
10%5%36%6%46%6%8%10%37%
1955
11th to 20thNight
10%7%37%7%36%6%7%9%35%
1980
21st to endNight
13%7%37%7%35%6%5%9%36%
1980
October1st to 10thNight
12%6%35%5%35%5%5%7%44%
2101
11th to 20thNight
9%32442445%6%56%
2160
21st to endNight
10%425%5%2445%6%55%
2376
November1st to 10thNight
10%5%2432435%6%54%
2221
11th to 20thNight
14%6%25%423446%49%
2280
21st to endNight
13%5%345%345%46%47%
2450
December1st to 10thNight
13%6%36%5%345%5%9%41%
2470
11th to 20thNight
15%7%24433446%48%
3042
21st to endNight
16%7%26%6%4445%6%39%
4532

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%6%11%23%20%4
1707
11th to 20thDay
37%5%10%21%21%6%
1638
21st to endDay
41%49%19%22%6%
1782
February1st to 10thDay
42%6%12%17%17%6%
1634
11th to 20thDay
38%6%10%15%24%7%
1758
21st to endDay
39%6%10%19%16%9%
1598
March1st to 10thDay
30%5%11%21%21%10%
1980
11th to 20thDay
34%8%15%20%16%7%
1980
21st to endDay
33%8%14%21%18%6%
2178
April1st to 10thDay
29%6%16%22%19%8%
1980
11th to 20thDay
32%5%12%24%18%8%
2123
21st to endDay
22%6%14%32%21%5%
2160
May1st to 10thDay
25%8%14%29%19%5%
2327
11th to 20thDay
31%10%19%24%14%2
2305
21st to endDay
32%10%20%22%14%1
2531
June1st to 10thDay
36%14%21%19%10%
2340
11th to 20thDay
31%12%22%27%7%
2340
21st to endDay
31%17%25%20%7%1
2340
July1st to 10thDay
31%16%27%20%6%1
2275
11th to 20thDay
36%15%26%17%5%
2271
21st to endDay
32%16%27%22%3
2405
August1st to 10thDay
36%16%25%18%4
2314
11th to 20thDay
38%15%27%17%3
2256
21st to endDay
46%14%19%16%4
2376
September1st to 10thDay
39%13%19%17%10%2
1999
11th to 20thDay
42%10%16%18%11%2
1980
21st to endDay
39%10%16%18%13%3
1980
October1st to 10thDay
36%6%13%18%20%7%
1859
11th to 20thDay
25%6%13%22%27%7%
1800
21st to endDay
31%5%9%18%25%11%
1980
November1st to 10thDay
31%6%11%18%23%11%
1857
11th to 20thDay
35%6%11%17%22%9%
1900
21st to endDay
34%6%10%23%21%7%
1727
December1st to 10thDay
38%7%14%20%15%6%
1710
11th to 20thDay
35%5%9%22%24%6%
2150
21st to endDay
41%6%9%19%21%4
3124
January1st to 10thNight
38%6%10%20%19%7%
2459
11th to 20thNight
38%5%10%17%22%8%
2378
21st to endNight
41%5%8%17%21%9%
2574
February1st to 10thNight
42%5%9%19%18%7%
2322
11th to 20thNight
39%6%10%15%21%9%
2099
21st to endNight
40%6%10%18%14%11%
1656
March1st to 10thNight
31%7%12%19%20%12%
1980
11th to 20thNight
36%7%15%19%14%9%
1980
21st to endNight
34%6%14%20%18%8%
2178
April1st to 10thNight
32%7%13%21%19%9%
1980
11th to 20thNight
32%6%9%22%20%10%
1785
21st to endNight
26%6%14%25%24%5%
1800
May1st to 10thNight
27%6%15%24%23%5%
1647
11th to 20thNight
29%12%20%22%15%2
1593
21st to endNight
34%10%16%27%11%2
1745
June1st to 10thNight
37%12%21%20%10%
1620
11th to 20thNight
34%13%22%24%6%
1620
21st to endNight
34%17%24%20%4
1620
July1st to 10thNight
35%13%25%20%5%1
1575
11th to 20thNight
38%15%26%16%6%
1566
21st to endNight
34%13%28%23%2
1672
August1st to 10thNight
35%17%26%18%3
1600
11th to 20thNight
41%18%21%18%2
1624
21st to endNight
48%14%18%16%4
1980
September1st to 10thNight
39%14%19%16%10%1
1955
11th to 20thNight
44%11%15%18%12%1
1980
21st to endNight
45%8%14%17%14%2
1980
October1st to 10thNight
38%6%12%18%18%7%
2101
11th to 20thNight
28%7%10%23%23%9%
2160
21st to endNight
30%6%9%18%25%12%
2376
November1st to 10thNight
32%411%19%23%12%
2221
11th to 20thNight
37%5%8%18%23%10%
2280
21st to endNight
37%6%10%19%21%8%
2450
December1st to 10thNight
40%7%15%16%17%5%
2470
11th to 20thNight
38%5%8%16%27%5%
3044
21st to endNight
44%7%7%20%18%4
4532

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
12%7%32%40%9%
270
11th to 20thDay
8%430%38%15%5%
246
21st to endDay
19%9%37%29%6%
264
February1st to 10thDay
16%10%23%35%16%
240
11th to 20thDay
21%8%23%38%11%
240
21st to endDay
11%8%32%38%10%1
316
March1st to 10thDay
11%431%34%18%2
420
11th to 20thDay
13%6%26%39%13%3
420
21st to endDay
11%7%27%34%18%2
462
April1st to 10thDay
10%8%25%35%19%3
420
11th to 20thDay
9%425%30%23%8%
412
21st to endDay
4220%35%30%9%
420
May1st to 10thDay
5%422%35%24%9%
423
11th to 20thDay
8%210%31%35%13%
447
21st to endDay
12%18%25%37%18%
485
June1st to 10thDay
8%17%27%42%14%
450
11th to 20thDay
8%17%22%37%24%
450
21st to endDay
6%15%23%45%21%
450
July1st to 10thDay
7%15%15%43%29%
445
11th to 20thDay
7%2410%46%31%
444
21st to endDay
6%2419%49%21%
488
August1st to 10thDay
11%15%16%41%26%
446
11th to 20thDay
7%1413%42%33%
439
21st to endDay
16%26%13%37%26%
495
September1st to 10thDay
11%27%18%40%22%
450
11th to 20thDay
14%210%20%41%13%
450
21st to endDay
13%16%22%39%19%
450
October1st to 10thDay
16%312%31%27%12%
450
11th to 20thDay
9%315%30%31%13%
450
21st to endDay
10%5%16%30%32%8%
495
November1st to 10thDay
12%5%17%34%24%8%
455
11th to 20thDay
17%5%25%31%18%3
460
21st to endDay
13%6%20%32%27%3
287
December1st to 10thDay
16%424%32%20%3
270
11th to 20thDay
16%6%26%32%17%4
270
21st to endDay
16%7%23%34%17%3
297
January1st to 10thNight
13%11%32%33%10%1
760
11th to 20thNight
14%8%29%33%15%2
732
21st to endNight
16%10%35%32%7%1
792
February1st to 10thNight
16%8%29%33%14%
720
11th to 20thNight
16%11%27%37%9%
703
21st to endNight
16%5%28%39%11%1
592
March1st to 10thNight
12%428%39%16%1
720
11th to 20thNight
13%7%23%38%18%1
720
21st to endNight
12%7%26%33%20%2
792
April1st to 10thNight
9%8%25%33%21%3
720
11th to 20thNight
12%421%33%25%5%
711
21st to endNight
8%418%37%25%7%
720
May1st to 10thNight
6%321%36%26%8%
567
11th to 20thNight
8%315%32%28%13%
531
21st to endNight
10%16%27%36%19%
584
June1st to 10thNight
12%26%29%38%12%
540
11th to 20thNight
6%26%24%39%23%
540
21st to endNight
5%26%26%43%18%
540
July1st to 10thNight
8%18%18%48%18%
525
11th to 20thNight
8%2413%52%21%
522
21st to endNight
7%2322%51%15%
591
August1st to 10thNight
9%15%21%47%17%
537
11th to 20thNight
8%15%18%49%20%
560
21st to endNight
13%26%16%40%23%
792
September1st to 10thNight
10%17%19%47%17%
720
11th to 20thNight
12%29%21%45%10%
720
21st to endNight
16%112%20%38%13%
720
October1st to 10thNight
14%315%27%31%11%
720
11th to 20thNight
10%415%31%31%9%
720
21st to endNight
11%5%19%27%31%6%
792
November1st to 10thNight
13%420%31%27%5%
740
11th to 20thNight
15%8%24%30%20%2
760
21st to endNight
14%7%24%31%21%3
760
December1st to 10thNight
14%7%26%34%15%3
760
11th to 20thNight
17%8%25%30%17%3
760
21st to endNight
18%9%26%32%15%1
836
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