Hamlin Beach State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hamlin Beach State Park clear sky chart from 2005-11-06 to 2024-01-31.

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
29%
22904
11%
75060
8%
22862
34%
22862
14%
55506

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
8%
758
6%
2649
2%
757
13%
757
4%
2227
January11th to 20thNight
10%
760
3%
2589
2%
760
12%
760
3%
2287
January21st to endNight
12%
835
6%
2711
3%
835
17%
835
5%
2328
February1st to 10thNight
7%
720
6%
2340
0%
720
14%
720
5%
1941
February11th to 20thNight
10%
702
7%
2275
3%
700
17%
700
7%
1864
February21st to endNight
13%
592
8%
1834
3%
592
19%
592
9%
1471
March1st to 10thNight
17%
720
10%
2021
4%
720
23%
720
13%
1603
March11th to 20thNight
20%
720
14%
1980
6%
720
28%
720
15%
1487
March21st to endNight
26%
792
15%
2154
7%
792
33%
792
18%
1602
April1st to 10thNight
21%
720
13%
1800
4%
720
26%
720
17%
1369
April11th to 20thNight
29%
711
14%
1775
5%
711
34%
711
22%
1288
April21st to endNight
33%
587
16%
1667
7%
587
39%
587
20%
1174
May1st to 10thNight
40%
482
14%
1562
10%
482
44%
482
19%
1063
May11th to 20thNight
39%
354
19%
1416
16%
354
50%
354
21%
851
May21st to endNight
49%
388
15%
1551
14%
388
59%
388
26%
880
June1st to 10thNight
43%
360
15%
1440
14%
360
53%
360
20%
903
June11th to 20thNight
47%
360
16%
1440
20%
360
56%
360
22%
845
June21st to endNight
49%
360
14%
1440
17%
360
55%
360
21%
875
July1st to 10thNight
58%
350
16%
1400
23%
350
62%
350
28%
754
July11th to 20thNight
53%
348
18%
1392
23%
348
58%
348
27%
765
July21st to endNight
58%
474
18%
1562
16%
448
63%
448
31%
893
August1st to 10thNight
59%
537
18%
1600
15%
534
61%
534
33%
957
August11th to 20thNight
56%
534
18%
1598
12%
534
59%
534
29%
996
August21st to endNight
55%
742
20%
1930
10%
742
58%
742
34%
1242
September1st to 10thNight
50%
720
18%
1800
9%
720
53%
720
32%
1197
September11th to 20thNight
54%
720
24%
1808
16%
720
57%
720
34%
1183
September21st to endNight
47%
720
18%
2074
14%
720
50%
720
25%
1391
October1st to 10thNight
36%
720
12%
2160
10%
720
39%
720
19%
1543
October11th to 20thNight
24%
720
10%
2160
7%
720
30%
720
15%
1616
October21st to endNight
20%
792
11%
2376
6%
792
26%
792
12%
1873
November1st to 10thNight
29%
740
16%
2443
13%
740
35%
740
16%
1685
November11th to 20thNight
20%
760
13%
2660
9%
760
26%
760
11%
1978
November21st to endNight
15%
760
7%
2660
4%
760
20%
760
9%
2090
December1st to 10thNight
9%
760
3%
2660
2%
760
11%
760
5%
2255
December11th to 20thNight
10%
759
4%
3260
0%
759
14%
759
4%
2758
December21st to endNight
7%
827
2%
4873
0%
817
11%
817
2%
4272

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
15%10%48%6%35%5%5%7%31%
74849
Night
16%11%5%8%7%35%5%5%6%28%
75275
TransparencyDay
52%7%12%18%10%1
74559
Night
54%7%12%17%8%1
75099
SeeingDay
19%14%29%24%11%3
13457
Night
21%15%29%24%10%1
22918

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 10thDay
14%17%9%13%10%46%6%35%12%
1517
11th to 20thDay
15%20%8%16%11%45%5%3410%
1586
21st to endDay
13%18%8%15%11%6%5%5%3410%
1872
February1st to 10thDay
17%15%7%13%9%46%5%5%415%
1620
11th to 20thDay
13%15%9%16%9%46%5%3416%
1573
21st to endDay
19%16%5%13%10%45%5%5%415%
1421
March1st to 10thDay
14%12%7%14%8%46%445%21%
1931
11th to 20thDay
15%13%5%8%8%35%446%30%
1980
21st to endDay
17%13%5%7%6%3445%6%31%
2201
April1st to 10thDay
16%11%5%7%6%34446%32%
2160
11th to 20thDay
19%8%36%6%345%45%38%
2134
21st to endDay
20%10%36%6%35%446%33%
2308
May1st to 10thDay
15%8%37%7%4446%7%35%
2398
11th to 20thDay
15%7%25%5%345%6%7%40%
2478
21st to endDay
11%436%6%35%6%6%8%43%
2725
June1st to 10thDay
14%6%36%5%45%5%6%8%40%
2520
11th to 20thDay
12%5%25%5%35%6%6%10%42%
2520
21st to endDay
12%5%35%5%3446%9%43%
2520
July1st to 10thDay
8%4245%35%46%9%50%
2520
11th to 20thDay
11%5%245%35%6%8%10%40%
2520
21st to endDay
10%5%26%6%45%6%7%10%39%
2660
August1st to 10thDay
9%5%36%5%45%6%7%9%43%
2327
11th to 20thDay
9%6%26%6%46%6%7%9%38%
2303
21st to endDay
12%5%35%5%35%5%6%9%42%
2408
September1st to 10thDay
14%6%35%5%345%6%9%41%
2160
11th to 20thDay
14%6%25%6%3445%8%43%
2150
21st to endDay
15%6%46%6%46%5%5%8%36%
1885
October1st to 10thDay
22%7%36%6%35%46%6%32%
1800
11th to 20thDay
19%10%49%6%45%5%6%7%27%
1800
21st to endDay
26%13%48%7%34445%22%
1980
November1st to 10thDay
14%12%47%7%35%5%5%6%30%
1634
11th to 20thDay
14%15%5%10%6%45%5%5%7%23%
1520
21st to endDay
20%17%6%9%7%35%45%6%17%
1520
December1st to 10thDay
21%20%8%10%7%34445%13%
1520
11th to 20thDay
18%18%9%16%7%3444413%
1906
21st to endDay
25%23%8%12%7%3433310%
2772
January1st to 10thNight
16%17%7%13%10%46%44415%
2649
11th to 20thNight
17%19%8%14%11%45%44411%
2589
21st to endNight
14%16%8%13%12%5%5%5%4413%
2711
February1st to 10thNight
16%17%6%13%9%45%5%5%5%16%
2340
11th to 20thNight
14%12%8%13%10%5%6%45%419%
2273
21st to endNight
17%14%7%14%7%5%436%6%19%
1834
March1st to 10thNight
15%14%6%10%8%45%5%5%5%24%
2011
11th to 20thNight
16%10%6%9%6%3445%6%31%
1979
21st to endNight
17%10%5%9%6%345%5%5%33%
2154
April1st to 10thNight
20%10%5%7%7%345%46%30%
1800
11th to 20thNight
16%9%36%6%35%5%5%7%35%
1775
21st to endNight
18%9%36%5%346%6%8%32%
1667
May1st to 10thNight
18%7%35%445%5%5%8%35%
1562
11th to 20thNight
12%5%37%5%35%5%7%8%42%
1415
21st to endNight
9%5%26%6%25%46%8%48%
1550
June1st to 10thNight
13%5%36%6%45%6%7%10%36%
1440
11th to 20thNight
11%5%35%5%45%5%6%9%42%
1440
21st to endNight
11%5%37%5%45%6%5%8%42%
1440
July1st to 10thNight
7%5%25%5%345%6%9%50%
1440
11th to 20thNight
10%5%245%346%6%8%47%
1440
21st to endNight
9%5%24425%5%7%10%46%
1654
August1st to 10thNight
9%5%145%35%5%6%9%47%
1611
11th to 20thNight
9%5%36%6%445%7%9%44%
1598
21st to endNight
9%5%25%6%35%6%6%9%45%
1930
September1st to 10thNight
14%5%25%5%3446%8%44%
1800
11th to 20thNight
14%5%345%24448%46%
1808
21st to endNight
16%6%25%6%35%5%6%8%37%
2074
October1st to 10thNight
19%8%37%6%35%6%6%6%33%
2160
11th to 20thNight
22%8%47%6%35%5%5%6%28%
2160
21st to endNight
28%12%36%5%35%5%45%23%
2376
November1st to 10thNight
15%11%46%6%35%6%5%7%34%
2443
11th to 20thNight
15%12%6%8%8%46%46%7%25%
2660
21st to endNight
19%14%6%9%7%45%45%7%20%
2660
December1st to 10thNight
20%18%8%10%8%35%5%45%13%
2660
11th to 20thNight
17%19%8%12%8%45%45%5%13%
3288
21st to endNight
30%18%7%10%6%344449%
4884

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
72%8%10%9%1
1518
11th to 20thDay
79%6%8%5%1
1586
21st to endDay
77%6%10%6%1
1872
February1st to 10thDay
70%7%11%10%1
1620
11th to 20thDay
72%6%8%11%3
1582
21st to endDay
71%6%9%9%5%
1421
March1st to 10thDay
64%6%10%14%41
1934
11th to 20thDay
57%6%9%16%11%1
1980
21st to endDay
55%6%8%19%11%2
2201
April1st to 10thDay
53%6%11%18%10%2
2160
11th to 20thDay
47%6%10%21%14%2
2134
21st to endDay
51%7%9%17%13%2
2308
May1st to 10thDay
48%7%11%20%12%2
2398
11th to 20thDay
42%8%11%23%13%3
2482
21st to endDay
38%8%14%24%14%1
2725
June1st to 10thDay
42%8%12%21%17%1
2520
11th to 20thDay
37%8%14%25%16%1
2520
21st to endDay
38%8%15%23%16%1
2520
July1st to 10thDay
31%8%14%28%17%2
2450
11th to 20thDay
36%10%17%25%11%
2445
21st to endDay
39%10%15%22%14%1
2511
August1st to 10thDay
36%9%18%23%13%1
2314
11th to 20thDay
40%10%16%24%10%
2303
21st to endDay
38%8%15%27%11%1
2408
September1st to 10thDay
39%8%14%26%12%1
2160
11th to 20thDay
39%6%13%27%15%
2150
21st to endDay
45%7%13%23%10%1
1885
October1st to 10thDay
51%7%12%18%11%
1800
11th to 20thDay
56%7%14%17%6%
1800
21st to endDay
65%6%11%12%5%1
1980
November1st to 10thDay
53%8%12%16%9%1
1634
11th to 20thDay
59%8%14%12%6%1
1520
21st to endDay
66%7%13%12%2
1520
December1st to 10thDay
73%5%12%9%1
1520
11th to 20thDay
74%8%10%6%3
1906
21st to endDay
80%6%8%6%
2772
January1st to 10thNight
71%7%10%10%2
2649
11th to 20thNight
77%7%9%6%1
2589
21st to endNight
73%6%9%8%3
2711
February1st to 10thNight
68%7%10%12%2
2340
11th to 20thNight
68%6%10%12%3
2275
21st to endNight
64%7%12%13%4
1834
March1st to 10thNight
61%7%12%15%5%
2021
11th to 20thNight
54%7%10%19%9%1
1980
21st to endNight
53%6%8%18%12%2
2154
April1st to 10thNight
55%6%9%20%9%1
1800
11th to 20thNight
47%7%12%18%13%2
1775
21st to endNight
48%7%11%19%13%2
1667
May1st to 10thNight
47%7%10%19%15%2
1562
11th to 20thNight
39%8%13%22%15%3
1416
21st to endNight
34%8%16%21%20%2
1551
June1st to 10thNight
41%9%13%22%14%2
1440
11th to 20thNight
38%7%12%22%19%2
1440
21st to endNight
40%8%13%22%16%1
1440
July1st to 10thNight
30%8%14%25%20%3
1400
11th to 20thNight
34%6%14%29%17%1
1392
21st to endNight
31%8%16%28%15%2
1562
August1st to 10thNight
32%8%17%29%14%1
1600
11th to 20thNight
36%7%18%27%11%
1598
21st to endNight
33%9%14%29%12%2
1930
September1st to 10thNight
37%7%14%28%12%2
1800
11th to 20thNight
36%7%12%28%16%1
1808
21st to endNight
41%8%14%24%12%1
2074
October1st to 10thNight
49%8%13%17%12%1
2160
11th to 20thNight
53%8%14%17%8%
2160
21st to endNight
60%8%12%12%7%1
2376
November1st to 10thNight
48%8%13%19%10%2
2443
11th to 20thNight
56%8%13%15%7%1
2660
21st to endNight
61%8%16%12%2
2660
December1st to 10thNight
70%8%13%7%1
2660
11th to 20thNight
69%10%11%9%2
3288
21st to endNight
78%7%10%5%
4884

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
25%28%29%12%6%
180
11th to 20thDay
31%25%34%9%1
211
21st to endDay
23%26%33%15%3
294
February1st to 10thDay
27%29%36%8%
240
11th to 20thDay
23%35%35%8%
240
21st to endDay
34%23%31%11%
287
March1st to 10thDay
20%25%34%18%3
420
11th to 20thDay
25%21%32%17%31
420
21st to endDay
28%18%31%16%6%1
462
April1st to 10thDay
22%20%33%19%5%
420
11th to 20thDay
26%17%28%18%8%2
412
21st to endDay
23%16%35%20%6%1
420
May1st to 10thDay
22%11%34%22%9%3
423
11th to 20thDay
15%9%33%30%10%2
447
21st to endDay
13%7%31%29%16%4
485
June1st to 10thDay
16%10%31%32%10%1
450
11th to 20thDay
16%10%25%35%13%2
450
21st to endDay
12%8%34%31%14%1
450
July1st to 10thDay
7%7%23%36%22%5%
445
11th to 20thDay
13%425%34%19%5%
444
21st to endDay
10%6%28%41%13%2
488
August1st to 10thDay
9%5%21%39%20%6%
446
11th to 20thDay
10%5%23%34%21%5%
439
21st to endDay
11%7%26%33%18%5%
495
September1st to 10thDay
14%9%23%31%17%6%
450
11th to 20thDay
13%7%21%26%22%9%
450
21st to endDay
15%12%28%24%15%6%
450
October1st to 10thDay
23%10%26%21%14%5%
450
11th to 20thDay
23%20%31%17%8%2
450
21st to endDay
33%15%29%18%5%
495
November1st to 10thDay
21%18%33%18%8%2
326
11th to 20thDay
22%27%32%15%32
180
21st to endDay
29%22%32%14%3
180
December1st to 10thDay
29%26%27%16%3
180
11th to 20thDay
27%30%27%13%3
180
21st to endDay
33%26%27%12%1
198
January1st to 10thNight
25%29%29%13%4
760
11th to 20thNight
25%27%30%16%2
760
21st to endNight
20%26%33%16%4
835
February1st to 10thNight
27%27%33%13%1
720
11th to 20thNight
21%27%34%15%2
703
21st to endNight
24%25%32%16%2
592
March1st to 10thNight
24%18%35%19%4
720
11th to 20thNight
24%21%30%20%4
720
21st to endNight
21%13%34%23%8%1
792
April1st to 10thNight
23%16%36%22%4
720
11th to 20thNight
21%15%30%25%7%1
711
21st to endNight
25%9%29%29%9%
587
May1st to 10thNight
22%6%27%28%15%1
482
11th to 20thNight
15%5%32%38%10%
354
21st to endNight
11%5%29%34%20%2
389
June1st to 10thNight
13%5%30%36%15%1
360
11th to 20thNight
13%5%27%38%18%
360
21st to endNight
11%426%45%13%
360
July1st to 10thNight
7%322%41%23%3
350
11th to 20thNight
11%5%24%36%22%2
348
21st to endNight
11%225%42%18%3
474
August1st to 10thNight
11%221%40%23%3
537
11th to 20thNight
10%5%20%36%25%4
534
21st to endNight
10%424%35%25%2
742
September1st to 10thNight
16%6%21%29%23%3
720
11th to 20thNight
16%5%19%29%23%6%
720
21st to endNight
16%10%21%30%18%4
720
October1st to 10thNight
22%10%27%23%16%2
720
11th to 20thNight
25%15%30%22%7%1
720
21st to endNight
34%12%29%21%4
792
November1st to 10thNight
23%15%28%26%8%1
740
11th to 20thNight
21%24%30%17%6%1
760
21st to endNight
27%21%31%15%5%
760
December1st to 10thNight
31%23%29%13%3
760
11th to 20thNight
25%26%31%15%3
760
21st to endNight
33%22%30%12%2
836
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