Oscoda
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oscoda clear sky chart from 2005-11-05 to

2017-09-12
.

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
38%
15479
13%
46754
9%
15438
42%
15438
20%
32791

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
18%
899
7%
2506
2%
895
23%
895
11%
2009
January16th to endNight
23%
913
10%
2641
4%
913
28%
913
13%
2099
February1st to 15thNight
22%
701
9%
2287
3%
701
28%
701
13%
1730
February16th to endNight
30%
631
11%
1898
5%
631
36%
631
14%
1440
March1st to 15thNight
30%
720
15%
2079
9%
720
35%
720
20%
1478
March16th to endNight
38%
768
18%
2112
10%
768
44%
768
24%
1447
April1st to 15thNight
32%
581
17%
1782
9%
581
40%
581
21%
1225
April16th to endNight
43%
540
19%
1620
13%
540
47%
540
24%
1095
May1st to 15thNight
48%
540
15%
1620
13%
540
51%
540
24%
1094
May16th to endNight
55%
487
17%
1533
16%
486
59%
486
30%
930
June1st to 15thNight
55%
360
13%
1260
13%
360
58%
360
25%
772
June16th to endNight
60%
360
14%
1260
14%
360
64%
360
26%
767
July1st to 15thNight
69%
439
15%
1289
16%
439
69%
439
38%
732
July16th to endNight
68%
564
14%
1453
12%
531
68%
531
34%
894
August1st to 15thNight
69%
539
18%
1609
16%
536
72%
536
36%
920
August16th to endNight
64%
573
22%
1719
16%
573
68%
573
35%
1009
September1st to 15thNight
58%
647
19%
1871
14%
647
61%
647
32%
1134
September16th to endNight
55%
657
17%
1815
12%
657
58%
657
29%
1175
October1st to 15thNight
40%
660
16%
1911
11%
660
44%
660
23%
1335
October16th to endNight
27%
704
11%
2222
7%
704
34%
704
16%
1616
November1st to 15thNight
32%
700
15%
2276
14%
700
36%
700
18%
1575
November16th to endNight
23%
720
8%
2497
5%
720
28%
720
12%
1892
December1st to 15thNight
16%
816
6%
2616
1%
816
21%
816
10%
2059
December16th to endNight
16%
960
7%
2878
1%
960
21%
960
10%
2364

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
13%7%36%6%35%5%5%8%35%
47901
Night
14%8%36%5%3445%7%34%
46927
Cloud CoverDay
12%7%36%6%35%5%5%8%34%
47911
Night
14%8%36%5%3445%7%34%
46931
TransparencyDay
46%8%14%19%9%1
47592
Night
48%7%14%19%9%1
46754
SeeingDay
15%425%31%17%5%
5879
Night
18%6%28%29%14%2
15484

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
17%12%5%9%7%35%46%7%19%
1432
16th to endDay
12%13%7%11%9%46%45%7%16%
1581
February1st to 15thDay
13%14%49%7%5%6%45%6%21%
1575
16th to endDay
13%9%39%9%47%5%5%7%24%
1575
March1st to 15thDay
12%9%38%6%47%5%5%8%28%
1870
16th to endDay
14%8%46%6%35%45%7%31%
2112
April1st to 15thDay
18%10%36%5%24436%33%
2176
16th to endDay
14%6%24425%35%8%40%
2340
May1st to 15thDay
16%6%36%6%35%45%6%36%
2331
16th to endDay
12%4245%2445%7%45%
2578
June1st to 15thDay
10%5%345%2446%9%41%
2700
16th to endDay
10%4245%35%5%6%9%39%
2700
July1st to 15thDay
7%3244345%7%9%47%
2589
16th to endDay
7%3145%35%5%6%10%45%
2616
August1st to 15thDay
7%3145%345%8%10%44%
2340
16th to endDay
9%415%4345%6%9%44%
2483
September1st to 15thDay
12%5%245%345%6%9%42%
1994
16th to endDay
12%6%25%4245%5%9%40%
1815
October1st to 15thDay
15%7%36%5%25%446%36%
1719
16th to endDay
21%10%37%7%45%5%6%6%22%
1647
November1st to 15thDay
16%10%37%6%35%5%5%6%28%
1582
16th to endDay
18%11%5%6%7%5%6%5%5%6%21%
1461
December1st to 15thDay
15%12%48%6%46%5%5%8%20%
1341
16th to endDay
19%13%5%8%7%46%5%5%6%16%
1344
January1st to 15thNight
18%11%5%8%6%35%5%5%7%21%
2506
16th to endNight
13%12%5%9%7%45%5%6%6%22%
2641
February1st to 15thNight
12%14%5%8%6%35%5%5%6%25%
2285
16th to endNight
14%13%5%9%6%35%5%46%24%
1898
March1st to 15thNight
14%8%47%5%345%5%5%35%
2067
16th to endNight
14%9%35%5%23346%40%
2112
April1st to 15thNight
19%7%35%42345%7%35%
1782
16th to endNight
17%7%26%42425%6%39%
1620
May1st to 15thNight
13%6%25%6%45%45%8%36%
1620
16th to endNight
13%414425%45%8%45%
1531
June1st to 15thNight
12%435%42446%8%42%
1260
16th to endNight
9%415%5%35%5%6%8%43%
1260
July1st to 15thNight
7%3145%25%5%5%7%51%
1368
16th to endNight
6%3235%345%7%10%46%
1552
August1st to 15thNight
6%3143345%6%9%50%
1620
16th to endNight
10%31432445%7%52%
1719
September1st to 15thNight
10%5%24424447%49%
1871
16th to endNight
13%5%25%335%45%8%44%
1815
October1st to 15thNight
15%7%26%5%3445%7%38%
1911
16th to endNight
21%8%26%5%34447%30%
2222
November1st to 15thNight
13%9%37%6%3445%7%33%
2276
16th to endNight
19%11%46%6%35%46%8%23%
2497
December1st to 15thNight
19%12%47%6%36%447%22%
2616
16th to endNight
20%14%5%8%6%35%45%6%17%
2878

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
16%12%5%10%7%35%46%7%19%
1432
16th to endDay
12%13%7%11%10%46%5%48%15%
1581
February1st to 15thDay
13%14%5%8%7%5%6%45%6%21%
1575
16th to endDay
12%10%39%8%46%6%5%8%24%
1575
March1st to 15thDay
12%8%38%6%47%5%5%8%28%
1881
16th to endDay
14%8%47%7%35%45%7%31%
2111
April1st to 15thDay
17%10%36%5%24437%33%
2176
16th to endDay
14%6%2442445%8%40%
2340
May1st to 15thDay
15%7%36%5%35%45%6%36%
2331
16th to endDay
11%5%2442445%8%45%
2578
June1st to 15thDay
10%5%25%5%2446%9%41%
2700
16th to endDay
10%425%5%35%6%6%9%39%
2700
July1st to 15thDay
6%3244345%6%10%47%
2589
16th to endDay
7%3145%25%5%6%11%45%
2616
August1st to 15thDay
7%4145%4448%10%44%
2340
16th to endDay
8%4245%346%5%9%44%
2483
September1st to 15thDay
12%5%244345%6%8%42%
1994
16th to endDay
12%6%245%245%6%9%40%
1815
October1st to 15thDay
14%7%36%5%35%5%5%6%36%
1719
16th to endDay
21%9%47%6%45%5%6%6%22%
1647
November1st to 15thDay
16%9%37%6%45%5%47%27%
1582
16th to endDay
17%12%5%7%6%46%5%5%6%20%
1461
December1st to 15thDay
15%13%48%7%5%6%46%8%20%
1341
16th to endDay
19%14%48%8%45%5%6%7%14%
1344
January1st to 15thNight
18%11%5%8%6%445%5%7%19%
2506
16th to endNight
13%12%5%9%7%45%5%6%6%22%
2641
February1st to 15thNight
12%14%5%8%6%35%5%5%5%25%
2278
16th to endNight
14%13%5%9%6%35%5%47%24%
1898
March1st to 15thNight
14%8%48%5%345%5%5%34%
2079
16th to endNight
14%8%35%5%23346%40%
2112
April1st to 15thNight
19%7%35%4235%5%7%35%
1782
16th to endNight
16%7%35%5%3425%6%39%
1620
May1st to 15thNight
13%6%25%6%45%45%8%36%
1619
16th to endNight
12%424425%5%5%8%45%
1531
June1st to 15thNight
12%435%4345%5%8%42%
1260
16th to endNight
8%425%5%35%5%6%8%42%
1260
July1st to 15thNight
6%3145%245%5%8%51%
1368
16th to endNight
6%324435%5%7%10%46%
1552
August1st to 15thNight
6%2244245%6%9%50%
1620
16th to endNight
9%31432446%6%52%
1719
September1st to 15thNight
10%424423447%49%
1871
16th to endNight
13%5%15%435%45%7%44%
1815
October1st to 15thNight
15%7%26%5%3445%7%37%
1911
16th to endNight
21%8%26%6%245%5%7%29%
2222
November1st to 15thNight
13%9%37%6%3445%7%33%
2276
16th to endNight
19%10%46%7%35%46%7%23%
2497
December1st to 15thNight
18%12%47%5%46%447%21%
2616
16th to endNight
20%14%6%8%6%45%46%6%17%
2878

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
61%7%16%11%3
1433
16th to endDay
65%9%11%9%3
1581
February1st to 15thDay
62%7%12%13%5%
1577
16th to endDay
57%9%13%13%5%1
1575
March1st to 15thDay
52%7%14%16%7%
1881
16th to endDay
50%8%15%16%8%1
2112
April1st to 15thDay
52%5%11%19%11%
2176
16th to endDay
41%7%16%17%13%2
2340
May1st to 15thDay
47%6%9%22%11%2
2331
16th to endDay
36%7%14%24%14%2
2582
June1st to 15thDay
37%9%14%24%13%1
2700
16th to endDay
38%9%15%22%13%
2700
July1st to 15thDay
29%10%14%26%16%2
2439
16th to endDay
33%10%16%23%14%1
2452
August1st to 15thDay
32%10%17%26%11%
2327
16th to endDay
34%11%14%26%11%1
2483
September1st to 15thDay
37%9%14%27%10%
1994
16th to endDay
38%9%20%22%8%
1815
October1st to 15thDay
46%7%12%21%10%
1719
16th to endDay
58%9%16%11%3
1647
November1st to 15thDay
54%6%14%16%7%
1582
16th to endDay
60%8%16%10%2
1461
December1st to 15thDay
59%9%16%10%2
1341
16th to endDay
66%10%13%7%2
1344
January1st to 15thNight
61%7%14%11%4
2506
16th to endNight
59%8%13%13%4
2641
February1st to 15thNight
57%7%12%15%6%
2287
16th to endNight
57%6%15%13%6%
1898
March1st to 15thNight
49%6%13%21%8%
2079
16th to endNight
44%5%13%21%13%1
2112
April1st to 15thNight
48%5%9%22%13%1
1782
16th to endNight
46%48%19%16%3
1620
May1st to 15thNight
44%6%10%21%14%2
1620
16th to endNight
36%5%11%28%13%4
1533
June1st to 15thNight
38%6%12%23%16%1
1260
16th to endNight
36%7%13%21%18%1
1260
July1st to 15thNight
28%6%14%27%20%2
1289
16th to endNight
31%8%17%24%16%1
1453
August1st to 15thNight
27%8%16%30%14%1
1609
16th to endNight
29%8%13%32%14%1
1719
September1st to 15thNight
33%7%14%30%13%
1871
16th to endNight
37%7%17%26%10%
1815
October1st to 15thNight
45%7%11%23%11%
1911
16th to endNight
52%7%17%17%5%
2222
November1st to 15thNight
48%6%17%19%7%
2276
16th to endNight
57%7%18%11%3
2497
December1st to 15thNight
60%8%15%11%4
2616
16th to endNight
65%7%13%9%3
2878

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
18%7%41%27%4
90
16th to endDay
28%327%32%8%1
96
February1st to 15thDay
24%11%38%23%2
90
16th to endDay
18%9%39%27%4
81
March1st to 15thDay
21%10%30%28%9%
171
16th to endDay
22%5%26%31%11%2
288
April1st to 15thDay
25%5%26%27%14%1
270
16th to endDay
20%431%25%14%3
270
May1st to 15thDay
20%328%23%17%5%
288
16th to endDay
15%226%30%20%4
405
June1st to 15thDay
12%127%36%18%4
495
16th to endDay
12%223%35%20%4
495
July1st to 15thDay
9%117%42%22%6%
475
16th to endDay
7%122%39%22%6%
476
August1st to 15thDay
9%15%34%28%11%
313
16th to endDay
9%315%32%27%10%
332
September1st to 15thDay
12%320%30%20%12%
299
16th to endDay
15%221%25%25%9%
254
October1st to 15thDay
18%9%26%27%13%3
255
16th to endDay
27%8%29%27%6%
159
November1st to 15thDay
11%431%40%13%
90
16th to endDay
17%19%30%28%31
63
December1st to 15thDay
25%10%41%18%5%
60
16th to endDay
29%20%40%9%
64
January1st to 15thNight
24%10%35%22%5%
900
16th to endNight
17%8%36%27%8%1
913
February1st to 15thNight
20%5%39%29%4
704
16th to endNight
19%9%31%31%7%
631
March1st to 15thNight
17%7%36%27%9%
720
16th to endNight
18%6%29%31%10%2
768
April1st to 15thNight
22%5%33%28%9%1
581
16th to endNight
21%425%31%15%2
540
May1st to 15thNight
16%321%39%16%2
540
16th to endNight
14%220%36%24%1
488
June1st to 15thNight
13%320%37%23%2
360
16th to endNight
10%118%38%28%3
360
July1st to 15thNight
7%113%46%25%5%
439
16th to endNight
8%114%41%30%4
564
August1st to 15thNight
8%113%38%32%5%
539
16th to endNight
11%117%31%33%5%
573
September1st to 15thNight
13%5%17%34%20%8%
647
16th to endNight
15%319%31%22%8%
657
October1st to 15thNight
19%5%28%28%16%1
660
16th to endNight
25%9%32%26%5%
704
November1st to 15thNight
17%10%34%24%12%1
700
16th to endNight
23%12%33%22%7%
720
December1st to 15thNight
25%13%36%20%4
816
16th to endNight
27%9%36%20%4
960
Page generated at 2017-09-13 07:39:11. Version ac04

Copyright 2017 A. Danko


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