Oscoda
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oscoda clear sky chart from 2005-11-06 to 2024-03-28.

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
36%
24182
13%
81250
9%
24084
42%
24084
17%
57927

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
21%
942
7%
4388
3%
926
26%
926
8%
3222
January11th to 20thNight
18%
947
6%
4435
3%
930
22%
930
6%
3683
January21st to endNight
23%
960
5%
4742
4%
948
29%
948
7%
3923
February1st to 10thNight
22%
760
11%
2470
5%
760
28%
760
13%
1865
February11th to 20thNight
24%
740
13%
2316
5%
739
33%
739
15%
1678
February21st to endNight
21%
628
11%
1884
2%
628
29%
628
14%
1427
March1st to 10thNight
28%
760
18%
2247
9%
760
36%
760
22%
1548
March11th to 20thNight
29%
760
18%
2090
8%
760
37%
760
23%
1429
March21st to endNight
34%
821
15%
2256
8%
821
39%
821
20%
1613
April1st to 10thNight
30%
604
15%
1864
7%
604
38%
604
20%
1277
April11th to 20thNight
38%
533
20%
1602
13%
533
44%
533
24%
1070
April21st to endNight
41%
540
17%
1620
10%
540
46%
540
22%
1130
May1st to 10thNight
46%
540
15%
1620
12%
540
49%
540
23%
1092
May11th to 20thNight
49%
531
18%
1593
15%
531
52%
531
25%
1049
May21st to endNight
59%
472
18%
1523
18%
471
63%
471
32%
894
June1st to 10thNight
56%
360
16%
1260
16%
360
60%
360
27%
750
June11th to 20thNight
56%
360
17%
1260
17%
360
61%
360
29%
734
June21st to endNight
59%
360
16%
1260
16%
360
62%
360
26%
758
July1st to 10thNight
70%
418
18%
1293
18%
418
73%
418
40%
698
July11th to 20thNight
67%
522
17%
1392
14%
522
69%
522
37%
841
July21st to endNight
65%
591
15%
1541
13%
558
66%
558
35%
944
August1st to 10thNight
69%
537
19%
1600
16%
534
71%
534
36%
915
August11th to 20thNight
67%
534
22%
1598
17%
534
72%
534
40%
889
August21st to endNight
59%
594
20%
1782
14%
594
63%
594
31%
1104
September1st to 10thNight
58%
630
18%
1870
13%
630
61%
630
31%
1138
September11th to 20thNight
60%
720
24%
1980
17%
720
63%
720
35%
1220
September21st to endNight
46%
720
18%
1980
12%
720
50%
720
26%
1329
October1st to 10thNight
44%
720
16%
2047
13%
720
47%
720
25%
1386
October11th to 20thNight
29%
720
13%
2160
7%
720
37%
720
18%
1578
October21st to endNight
27%
792
12%
2556
9%
792
33%
792
15%
1874
November1st to 10thNight
34%
740
18%
2406
14%
740
42%
740
20%
1592
November11th to 20thNight
24%
760
12%
2529
8%
760
30%
760
13%
1867
November21st to endNight
21%
760
8%
2660
4%
760
26%
760
12%
2021
December1st to 10thNight
18%
817
9%
2717
3%
817
25%
817
10%
2126
December11th to 20thNight
17%
950
7%
3487
1%
948
22%
948
10%
2681
December21st to endNight
13%
1039
4%
5222
1%
1026
18%
1026
4%
4582

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%9%47%6%45%5%6%8%34%
78480
Night
15%10%47%6%35%5%5%7%32%
81535
TransparencyDay
47%9%14%19%10%1
78190
Night
50%8%13%19%9%1
81361
SeeingDay
16%8%28%29%15%4
14515
Night
18%8%29%30%13%2
24213

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
16%12%7%10%8%35%45%6%23%
2527
11th to 20thDay
13%15%6%12%9%5%7%6%6%8%13%
2530
21st to endDay
18%17%7%11%7%345%5%6%17%
2903
February1st to 10thDay
12%14%410%8%6%6%6%5%7%22%
1710
11th to 20thDay
11%11%5%9%8%5%7%5%5%6%26%
1748
21st to endDay
13%10%48%8%5%7%5%6%7%27%
1570
March1st to 10thDay
12%10%48%7%5%7%5%5%7%30%
1930
11th to 20thDay
11%9%5%8%6%46%5%7%8%31%
2090
21st to endDay
16%9%47%8%35%46%8%30%
2255
April1st to 10thDay
17%11%48%6%35%5%5%7%30%
2110
11th to 20thDay
17%9%36%5%25%45%8%36%
2307
21st to endDay
15%8%36%5%36%45%7%37%
2340
May1st to 10thDay
15%7%37%6%35%5%5%7%36%
2340
11th to 20thDay
16%6%36%7%35%447%40%
2301
21st to endDay
11%5%25%5%35%5%6%9%45%
2746
June1st to 10thDay
11%6%35%5%35%5%7%9%42%
2700
11th to 20thDay
10%5%25%5%35%5%7%10%43%
2700
21st to endDay
10%5%35%5%36%5%6%9%43%
2700
July1st to 10thDay
6%423435%5%7%10%50%
2624
11th to 20thDay
8%5%25%6%45%6%6%9%44%
2520
21st to endDay
8%425%5%35%6%6%10%45%
2685
August1st to 10thDay
9%4245%46%5%8%10%43%
2327
11th to 20thDay
7%425%5%45%6%7%10%47%
2303
21st to endDay
10%6%25%5%35%5%7%10%44%
2574
September1st to 10thDay
10%6%35%6%445%6%10%40%
2069
11th to 20thDay
12%5%244245%6%10%46%
1980
21st to endDay
14%6%36%6%35%6%6%9%36%
1980
October1st to 10thDay
15%6%37%6%35%5%47%38%
1913
11th to 20thDay
20%11%46%6%35%5%5%7%28%
1800
21st to endDay
21%10%37%7%5%5%5%7%7%22%
1796
November1st to 10thDay
13%11%37%6%46%5%6%8%30%
1672
11th to 20thDay
13%10%5%8%8%5%7%6%6%8%25%
1649
21st to endDay
18%13%6%8%7%5%5%5%5%6%22%
1520
December1st to 10thDay
13%14%6%9%8%5%6%5%7%8%20%
1459
11th to 20thDay
16%15%5%8%6%46%5%6%7%23%
1671
21st to endDay
26%22%7%9%7%3443410%
2431
January1st to 10thNight
17%12%6%9%8%45%5%5%6%24%
4428
11th to 20thNight
13%14%7%12%11%5%6%5%5%5%17%
4440
21st to endNight
17%16%7%10%8%46%45%5%17%
4757
February1st to 10thNight
11%14%5%9%8%46%6%6%7%23%
2470
11th to 20thNight
13%13%5%8%7%45%5%5%7%29%
2316
21st to endNight
14%13%6%10%7%45%5%46%26%
1884
March1st to 10thNight
12%9%5%8%5%345%5%6%38%
2237
11th to 20thNight
12%8%47%6%345%6%7%38%
2089
21st to endNight
17%10%37%5%35%45%6%36%
2256
April1st to 10thNight
17%9%36%6%245%5%7%36%
1864
11th to 20thNight
17%8%37%42435%8%39%
1602
21st to endNight
17%9%38%6%3435%6%36%
1620
May1st to 10thNight
11%7%36%6%45%5%6%9%36%
1620
11th to 20thNight
15%7%26%5%35%5%5%7%40%
1592
21st to endNight
12%4145%35%5%6%8%48%
1522
June1st to 10thNight
12%5%35%435%46%7%45%
1260
11th to 20thNight
10%5%26%5%345%8%9%44%
1260
21st to endNight
8%5%36%6%35%5%6%8%45%
1260
July1st to 10thNight
6%315%5%245%6%7%56%
1331
11th to 20thNight
6%3246%35%6%7%10%48%
1440
21st to endNight
8%4245%45%5%6%9%49%
1632
August1st to 10thNight
8%42443446%10%50%
1611
11th to 20thNight
8%3144245%6%9%54%
1598
21st to endNight
11%5%25%445%6%5%7%47%
1782
September1st to 10thNight
8%6%35%5%35%6%6%8%47%
1870
11th to 20thNight
10%5%24345%46%7%50%
1980
21st to endNight
16%6%26%5%3445%8%40%
1980
October1st to 10thNight
16%7%25%5%35%5%6%8%39%
2047
11th to 20thNight
19%10%37%6%345%5%7%32%
2160
21st to endNight
22%10%46%5%3445%7%29%
2556
November1st to 10thNight
12%9%47%5%3445%8%38%
2406
11th to 20thNight
14%11%5%7%8%5%6%5%6%7%26%
2529
21st to endNight
19%13%48%6%35%45%7%25%
2660
December1st to 10thNight
17%12%49%7%46%46%7%24%
2717
11th to 20thNight
15%13%6%8%7%46%6%6%9%20%
3526
21st to endNight
25%22%7%10%6%3434411%
5233

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
61%9%17%10%3
2528
11th to 20thDay
68%12%12%6%2
2530
21st to endDay
66%9%15%7%3
2903
February1st to 10thDay
59%9%11%16%5%
1710
11th to 20thDay
57%9%12%15%7%1
1757
21st to endDay
54%9%13%16%6%1
1570
March1st to 10thDay
52%8%13%17%8%1
1933
11th to 20thDay
48%9%13%19%8%3
2090
21st to endDay
51%9%13%18%10%1
2255
April1st to 10thDay
54%7%11%18%9%1
2110
11th to 20thDay
45%7%13%19%15%1
2307
21st to endDay
45%8%15%16%13%2
2340
May1st to 10thDay
46%8%10%23%12%2
2340
11th to 20thDay
44%6%11%22%14%2
2305
21st to endDay
34%10%16%23%15%3
2746
June1st to 10thDay
36%9%14%25%14%2
2700
11th to 20thDay
35%9%13%24%17%2
2700
21st to endDay
36%10%14%25%14%1
2700
July1st to 10thDay
26%9%16%27%19%3
2554
11th to 20thDay
33%10%14%26%15%2
2445
21st to endDay
33%11%16%23%15%2
2536
August1st to 10thDay
33%12%17%27%11%1
2314
11th to 20thDay
30%12%18%26%14%1
2303
21st to endDay
34%12%15%26%12%1
2574
September1st to 10thDay
38%9%15%25%12%1
2069
11th to 20thDay
33%10%17%29%10%
1980
21st to endDay
42%10%18%21%9%
1980
October1st to 10thDay
45%8%12%22%11%1
1913
11th to 20thDay
54%8%15%17%6%
1800
21st to endDay
57%10%16%12%5%
1796
November1st to 10thDay
51%8%13%19%9%
1672
11th to 20thDay
55%9%17%13%7%
1649
21st to endDay
61%8%17%12%21
1520
December1st to 10thDay
60%10%17%10%2
1459
11th to 20thDay
60%9%15%12%3
1671
21st to endDay
79%7%7%5%2
2431
January1st to 10thNight
57%9%15%14%4
4428
11th to 20thNight
67%10%11%9%2
4440
21st to endNight
68%8%10%10%3
4757
February1st to 10thNight
57%7%12%15%7%1
2470
11th to 20thNight
53%7%14%18%7%1
2318
21st to endNight
57%6%12%15%8%
1884
March1st to 10thNight
46%6%13%24%10%1
2247
11th to 20thNight
43%8%14%21%12%2
2090
21st to endNight
49%7%11%20%12%1
2256
April1st to 10thNight
48%6%10%20%14%2
1864
11th to 20thNight
44%5%10%22%16%3
1602
21st to endNight
49%5%9%18%15%4
1620
May1st to 10thNight
43%8%11%21%15%3
1620
11th to 20thNight
43%6%9%22%17%4
1593
21st to endNight
33%6%12%28%16%4
1523
June1st to 10thNight
37%6%12%26%17%2
1260
11th to 20thNight
33%8%14%23%19%2
1260
21st to endNight
36%8%12%22%19%3
1260
July1st to 10thNight
25%7%15%26%24%3
1293
11th to 20thNight
30%8%16%27%17%2
1392
21st to endNight
31%9%17%26%16%2
1541
August1st to 10thNight
28%8%17%31%14%1
1600
11th to 20thNight
26%8%18%33%15%2
1598
21st to endNight
32%10%14%29%13%2
1782
September1st to 10thNight
33%9%13%28%16%1
1870
11th to 20thNight
31%8%16%32%12%
1980
21st to endNight
41%8%16%25%9%
1980
October1st to 10thNight
42%8%13%24%12%1
2047
11th to 20thNight
51%8%14%20%7%1
2160
21st to endNight
54%7%15%18%6%
2556
November1st to 10thNight
44%7%16%24%9%1
2406
11th to 20thNight
55%7%16%15%5%
2529
21st to endNight
57%9%18%13%3
2660
December1st to 10thNight
59%9%14%13%4
2717
11th to 20thNight
57%10%16%12%4
3525
21st to endNight
75%8%9%6%2
5233

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%14%37%23%8%
270
11th to 20thDay
20%14%36%21%8%
270
21st to endDay
24%7%32%29%6%1
297
February1st to 10thDay
19%19%37%20%4
270
11th to 20thDay
16%18%42%20%3
270
21st to endDay
19%19%44%17%2
225
March1st to 10thDay
18%17%38%19%7%
303
11th to 20thDay
18%14%33%26%9%1
460
21st to endDay
22%10%32%28%7%1
490
April1st to 10thDay
22%9%32%28%9%
420
11th to 20thDay
22%11%27%24%13%3
412
21st to endDay
20%9%32%26%12%1
420
May1st to 10thDay
18%9%32%27%11%3
423
11th to 20thDay
17%427%30%17%4
447
21st to endDay
12%324%33%23%5%
593
June1st to 10thDay
11%328%38%17%3
630
11th to 20thDay
12%427%34%19%4
630
21st to endDay
12%423%38%19%3
630
July1st to 10thDay
6%320%39%26%6%
621
11th to 20thDay
9%422%39%20%6%
618
21st to endDay
9%322%39%21%5%
626
August1st to 10thDay
11%219%33%27%8%
446
11th to 20thDay
6%315%36%30%10%
439
21st to endDay
11%5%19%35%23%6%
495
September1st to 10thDay
12%5%25%31%19%8%
450
11th to 20thDay
12%5%20%30%24%9%
450
21st to endDay
16%6%25%24%22%6%
450
October1st to 10thDay
20%10%25%24%16%4
450
11th to 20thDay
24%13%29%26%6%1
450
21st to endDay
24%14%33%23%6%
311
November1st to 10thDay
14%12%40%25%8%1
270
11th to 20thDay
16%21%34%22%5%1
241
21st to endDay
21%13%46%18%2
180
December1st to 10thDay
22%13%36%20%8%1
180
11th to 20thDay
27%18%38%15%2
180
21st to endDay
26%17%38%16%31
198
January1st to 10thNight
20%12%35%26%6%1
950
11th to 20thNight
22%13%34%24%7%
950
21st to endNight
18%9%35%30%8%1
970
February1st to 10thNight
18%8%40%31%4
760
11th to 20thNight
21%11%35%27%6%
743
21st to endNight
20%12%38%26%4
628
March1st to 10thNight
16%9%38%28%9%1
760
11th to 20thNight
15%11%37%27%9%1
760
21st to endNight
21%10%29%30%8%1
821
April1st to 10thNight
21%8%35%27%9%1
604
11th to 20thNight
22%6%27%29%14%2
533
21st to endNight
21%5%26%35%13%1
540
May1st to 10thNight
14%426%41%13%2
540
11th to 20thNight
18%420%37%20%1
531
21st to endNight
14%118%39%25%2
473
June1st to 10thNight
13%322%40%21%1
360
11th to 20thNight
10%323%37%26%2
360
21st to endNight
8%417%40%28%3
360
July1st to 10thNight
7%214%46%28%3
418
11th to 20thNight
7%216%40%29%6%
522
21st to endNight
9%315%42%29%2
591
August1st to 10thNight
9%114%39%32%4
537
11th to 20thNight
9%216%30%36%6%
534
21st to endNight
12%320%35%28%4
594
September1st to 10thNight
11%5%20%37%21%7%
630
11th to 20thNight
12%320%34%25%7%
720
21st to endNight
18%5%22%27%20%8%
720
October1st to 10thNight
19%6%26%29%18%2
720
11th to 20thNight
23%9%33%27%8%
720
21st to endNight
25%11%30%27%5%1
792
November1st to 10thNight
18%10%32%28%10%1
740
11th to 20thNight
18%14%36%23%9%
760
21st to endNight
24%13%37%22%5%
760
December1st to 10thNight
23%14%36%21%5%
817
11th to 20thNight
22%13%40%20%41
950
21st to endNight
29%12%34%21%4
1045
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