Manitoulin Eco Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manitoulin Eco Park 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
29%
23860
12%
81275
7%
23756
35%
23756
15%
59080

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
16%
945
5%
4710
3%
926
21%
926
5%
3753
January11th to 20thNight
17%
948
6%
4426
3%
930
21%
930
6%
3653
January21st to endNight
21%
926
6%
4673
5%
912
28%
912
7%
3770
February1st to 10thNight
18%
760
11%
2470
5%
760
26%
760
11%
1896
February11th to 20thNight
22%
741
13%
2403
5%
739
31%
739
13%
1760
February21st to endNight
17%
628
12%
1898
2%
628
27%
628
13%
1426
March1st to 10thNight
23%
760
17%
2199
6%
760
32%
760
20%
1490
March11th to 20thNight
25%
760
18%
2090
7%
760
35%
760
21%
1459
March21st to endNight
29%
821
17%
2256
7%
821
37%
821
23%
1528
April1st to 10thNight
24%
666
15%
1864
6%
666
32%
666
20%
1317
April11th to 20thNight
33%
533
21%
1597
11%
533
40%
533
25%
1047
April21st to endNight
30%
540
16%
1620
9%
540
36%
540
19%
1158
May1st to 10thNight
39%
540
13%
1620
10%
540
43%
540
23%
1104
May11th to 20thNight
41%
440
17%
1501
14%
440
49%
440
22%
953
May21st to endNight
43%
388
14%
1461
14%
388
51%
388
23%
867
June1st to 10thNight
38%
360
14%
1260
11%
360
46%
360
23%
768
June11th to 20thNight
50%
360
16%
1260
14%
360
56%
360
27%
740
June21st to endNight
49%
360
13%
1260
12%
360
54%
360
25%
782
July1st to 10thNight
55%
350
18%
1225
14%
350
64%
350
36%
651
July11th to 20thNight
57%
389
18%
1259
17%
389
63%
389
32%
743
July21st to endNight
53%
591
16%
1568
12%
558
56%
558
32%
973
August1st to 10thNight
54%
537
16%
1600
12%
534
60%
534
33%
959
August11th to 20thNight
56%
534
18%
1598
13%
534
61%
534
31%
977
August21st to endNight
51%
594
18%
1782
11%
594
56%
594
29%
1104
September1st to 10thNight
46%
670
18%
1808
10%
670
51%
670
32%
1147
September11th to 20thNight
49%
720
21%
1980
13%
720
54%
720
34%
1226
September21st to endNight
41%
720
18%
1980
11%
720
45%
720
24%
1362
October1st to 10thNight
35%
720
15%
2107
11%
720
41%
720
20%
1468
October11th to 20thNight
23%
720
13%
2160
7%
720
30%
720
13%
1638
October21st to endNight
19%
792
11%
2510
6%
792
26%
792
11%
1942
November1st to 10thNight
24%
740
16%
2433
10%
740
32%
740
14%
1772
November11th to 20thNight
19%
760
9%
2660
6%
760
24%
760
8%
2077
November21st to endNight
14%
760
7%
2660
4%
760
19%
760
7%
2150
December1st to 10thNight
13%
798
7%
2698
2%
798
18%
798
6%
2265
December11th to 20thNight
10%
950
7%
3474
1%
948
16%
948
7%
2756
December21st to endNight
10%
1039
3%
5205
1%
1026
14%
1026
3%
4399

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
14%10%47%6%345%5%7%34%
78421
Night
15%11%5%8%7%35%5%5%6%31%
81589
TransparencyDay
49%7%13%20%10%1
78122
Night
53%7%12%17%9%1
81423
SeeingDay
18%14%32%24%9%2
14402
Night
20%13%31%25%10%1
23884

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
18%19%10%11%6%3333420%
2217
11th to 20thDay
10%15%7%15%15%5%6%44415%
2530
21st to endDay
16%20%9%12%8%4444416%
2952
February1st to 10thDay
10%16%7%11%9%35%45%6%24%
1710
11th to 20thDay
11%14%6%10%7%46%45%5%28%
1663
21st to endDay
12%15%6%12%7%345%45%27%
1555
March1st to 10thDay
12%12%46%6%245%5%5%39%
1978
11th to 20thDay
11%10%6%8%6%3445%6%37%
2090
21st to endDay
14%11%46%5%335%5%7%36%
2255
April1st to 10thDay
17%12%5%6%5%3445%7%32%
2113
11th to 20thDay
18%8%36%5%3445%6%37%
2312
21st to endDay
20%9%36%42345%8%36%
2340
May1st to 10thDay
17%7%35%5%3445%8%40%
2340
11th to 20thDay
16%6%35%4345%48%42%
2388
21st to endDay
11%5%245%345%6%7%47%
2812
June1st to 10thDay
13%5%26%5%35%6%6%6%42%
2700
11th to 20thDay
11%6%245%35%5%6%9%44%
2700
21st to endDay
14%6%35%5%345%5%9%41%
2700
July1st to 10thDay
8%5%25%5%25%5%5%8%50%
2700
11th to 20thDay
8%5%25%5%45%5%6%8%46%
2656
21st to endDay
11%5%2443447%8%48%
2658
August1st to 10thDay
11%5%245%3446%10%44%
2327
11th to 20thDay
11%5%25%5%35%5%6%8%46%
2303
21st to endDay
11%7%35%5%346%5%8%42%
2574
September1st to 10thDay
11%7%36%6%345%5%9%41%
2130
11th to 20thDay
13%5%344345%5%9%45%
1980
21st to endDay
16%7%35%6%3446%7%38%
1980
October1st to 10thDay
17%9%37%6%35%5%6%6%35%
1851
11th to 20thDay
24%10%47%6%45%5%5%6%25%
1800
21st to endDay
25%13%5%7%5%34447%22%
1843
November1st to 10thDay
15%13%49%6%35%5%5%7%28%
1644
11th to 20thDay
17%13%6%9%7%45%5%5%7%21%
1520
21st to endDay
22%20%5%10%7%45%445%15%
1520
December1st to 10thDay
14%20%9%10%7%5%6%45%5%16%
1478
11th to 20thDay
18%17%6%10%8%5%5%6%45%18%
1671
21st to endDay
25%24%6%10%7%3434411%
2431
January1st to 10thNight
15%17%8%12%7%45%5%5%5%18%
4737
11th to 20thNight
12%14%7%15%10%45%5%45%17%
4440
21st to endNight
14%18%8%11%8%45%445%19%
4695
February1st to 10thNight
11%14%6%10%8%46%46%5%26%
2470
11th to 20thNight
10%13%5%10%8%45%5%5%6%29%
2403
21st to endNight
13%15%6%9%6%3446%6%26%
1898
March1st to 10thNight
12%8%47%7%44446%40%
2189
11th to 20thNight
11%10%38%6%3445%6%38%
2089
21st to endNight
14%9%37%6%3445%7%38%
2256
April1st to 10thNight
19%9%36%6%35%46%6%35%
1864
11th to 20thNight
17%9%35%43446%8%39%
1597
21st to endNight
16%10%48%7%3445%6%33%
1620
May1st to 10thNight
12%7%36%7%45%6%6%8%36%
1620
11th to 20thNight
13%6%37%5%36%5%6%6%39%
1501
21st to endNight
11%6%35%5%25%5%5%8%45%
1460
June1st to 10thNight
12%6%36%5%36%6%7%7%41%
1260
11th to 20thNight
10%5%336%35%6%5%10%43%
1260
21st to endNight
11%6%45%6%35%5%6%8%42%
1260
July1st to 10thNight
8%3134245%6%10%53%
1260
11th to 20thNight
6%425%6%46%6%6%8%47%
1301
21st to endNight
8%5%25%5%35%5%6%7%49%
1660
August1st to 10thNight
8%425%5%345%6%9%48%
1611
11th to 20thNight
10%326%5%45%5%5%8%48%
1598
21st to endNight
10%7%35%5%345%48%46%
1782
September1st to 10thNight
12%6%35%42345%9%48%
1808
11th to 20thNight
10%5%25%5%3446%7%49%
1980
21st to endNight
17%7%36%5%3445%7%40%
1980
October1st to 10thNight
18%7%47%6%34446%37%
2107
11th to 20thNight
22%10%47%6%35%5%6%6%27%
2160
21st to endNight
25%12%37%7%345%46%24%
2510
November1st to 10thNight
17%10%47%6%35%5%5%7%30%
2433
11th to 20thNight
15%14%6%10%7%45%5%5%6%22%
2660
21st to endNight
20%15%5%9%8%45%45%6%19%
2660
December1st to 10thNight
17%18%6%11%7%45%5%5%5%17%
2698
11th to 20thNight
16%17%6%9%7%35%5%5%5%21%
3526
21st to endNight
24%20%6%10%7%3435%5%14%
5236

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
69%6%11%10%3
2218
11th to 20thDay
74%6%9%8%31
2530
21st to endDay
70%8%9%8%5%1
2952
February1st to 10thDay
61%6%12%15%5%1
1710
11th to 20thDay
56%6%12%16%9%1
1672
21st to endDay
59%6%10%18%8%
1555
March1st to 10thDay
46%6%15%16%14%2
1981
11th to 20thDay
48%6%11%24%9%3
2090
21st to endDay
46%6%12%19%13%3
2255
April1st to 10thDay
52%5%13%17%12%1
2113
11th to 20thDay
47%6%8%25%13%1
2312
21st to endDay
46%6%11%19%14%3
2340
May1st to 10thDay
43%6%10%24%13%4
2340
11th to 20thDay
41%6%9%23%19%2
2392
21st to endDay
35%8%16%23%15%2
2812
June1st to 10thDay
38%8%12%26%14%2
2700
11th to 20thDay
37%6%13%25%17%2
2700
21st to endDay
40%7%13%24%13%2
2700
July1st to 10thDay
31%7%14%29%18%2
2626
11th to 20thDay
34%9%14%29%13%1
2575
21st to endDay
32%7%15%30%15%1
2510
August1st to 10thDay
34%8%17%26%13%1
2314
11th to 20thDay
34%8%18%29%12%
2303
21st to endDay
38%8%17%26%11%1
2574
September1st to 10thDay
38%8%15%26%11%1
2130
11th to 20thDay
36%7%18%30%9%1
1980
21st to endDay
44%9%16%23%8%
1980
October1st to 10thDay
48%8%13%20%10%1
1851
11th to 20thDay
58%7%13%15%6%
1800
21st to endDay
61%7%12%13%6%1
1843
November1st to 10thDay
55%7%15%17%6%
1644
11th to 20thDay
61%8%13%12%5%
1520
21st to endDay
71%7%10%9%3
1520
December1st to 10thDay
70%7%11%8%4
1478
11th to 20thDay
67%7%10%13%2
1671
21st to endDay
75%8%7%7%3
2431
January1st to 10thNight
66%8%11%9%5%1
4737
11th to 20thNight
68%9%11%8%4
4440
21st to endNight
67%8%9%12%5%
4695
February1st to 10thNight
60%6%10%17%6%1
2470
11th to 20thNight
55%7%11%18%8%1
2405
21st to endNight
57%6%12%16%9%
1898
March1st to 10thNight
46%5%14%19%14%2
2199
11th to 20thNight
46%5%12%21%12%2
2090
21st to endNight
45%5%12%19%16%4
2256
April1st to 10thNight
49%5%9%21%14%2
1864
11th to 20thNight
43%5%9%23%18%2
1597
21st to endNight
51%5%8%18%15%3
1620
May1st to 10thNight
45%6%12%21%12%3
1620
11th to 20thNight
43%6%9%23%16%3
1502
21st to endNight
37%8%14%21%16%4
1461
June1st to 10thNight
38%8%12%22%17%3
1260
11th to 20thNight
34%7%13%23%20%2
1260
21st to endNight
39%7%15%23%14%2
1260
July1st to 10thNight
26%7%15%28%20%4
1225
11th to 20thNight
31%9%14%29%16%1
1259
21st to endNight
33%8%14%27%17%1
1568
August1st to 10thNight
31%9%18%28%12%2
1600
11th to 20thNight
32%9%16%29%12%1
1598
21st to endNight
36%7%16%26%12%2
1782
September1st to 10thNight
34%8%14%29%14%2
1808
11th to 20thNight
34%6%17%34%10%
1980
21st to endNight
44%7%16%25%9%
1980
October1st to 10thNight
48%6%13%21%12%
2107
11th to 20thNight
56%8%12%19%5%
2160
21st to endNight
60%7%11%15%6%
2510
November1st to 10thNight
52%8%12%21%6%
2433
11th to 20thNight
61%8%14%11%5%
2660
21st to endNight
66%8%12%11%3
2660
December1st to 10thNight
69%8%9%11%2
2698
11th to 20thNight
63%8%13%9%6%1
3525
21st to endNight
73%7%11%6%3
5236

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
24%22%31%16%7%
184
11th to 20thDay
18%21%38%18%5%
270
21st to endDay
25%13%36%18%6%
297
February1st to 10thDay
23%25%34%13%4
270
11th to 20thDay
21%22%40%14%2
270
21st to endDay
25%30%35%9%1
225
March1st to 10thDay
20%22%37%17%31
351
11th to 20thDay
18%18%37%20%6%1
460
21st to endDay
24%17%32%20%5%1
490
April1st to 10thDay
22%14%31%24%8%1
420
11th to 20thDay
25%20%24%17%10%3
412
21st to endDay
26%13%35%17%7%1
420
May1st to 10thDay
20%13%37%22%7%2
423
11th to 20thDay
17%13%30%26%12%2
447
21st to endDay
13%9%37%26%13%2
572
June1st to 10thDay
15%11%36%29%9%
630
11th to 20thDay
13%12%35%30%8%2
630
21st to endDay
17%10%33%28%10%2
630
July1st to 10thDay
9%7%33%36%13%2
621
11th to 20thDay
10%9%30%35%12%4
618
21st to endDay
12%6%36%30%13%4
599
August1st to 10thDay
14%6%25%33%17%5%
446
11th to 20thDay
12%5%23%33%17%10%
439
21st to endDay
14%10%29%26%15%6%
495
September1st to 10thDay
14%11%28%28%14%6%
450
11th to 20thDay
13%10%27%30%13%6%
450
21st to endDay
18%14%27%24%14%4
450
October1st to 10thDay
21%16%25%24%10%2
450
11th to 20thDay
24%22%34%14%6%1
450
21st to endDay
30%21%32%14%21
358
November1st to 10thDay
24%24%33%16%3
257
11th to 20thDay
26%22%36%15%2
180
21st to endDay
31%26%31%9%3
180
December1st to 10thDay
30%20%29%16%4
180
11th to 20thDay
30%26%31%11%2
180
21st to endDay
30%30%29%8%21
198
January1st to 10thNight
20%18%33%23%5%1
950
11th to 20thNight
24%18%29%22%6%1
950
21st to endNight
19%11%35%25%9%1
934
February1st to 10thNight
18%18%39%21%4
760
11th to 20thNight
17%18%35%24%6%1
743
21st to endNight
21%17%38%20%4
628
March1st to 10thNight
16%17%38%22%6%
760
11th to 20thNight
17%15%38%22%8%1
760
21st to endNight
18%13%33%28%8%
821
April1st to 10thNight
24%12%35%25%5%
666
11th to 20thNight
21%12%32%23%11%2
533
21st to endNight
21%11%30%25%12%1
540
May1st to 10thNight
14%6%32%33%13%2
540
11th to 20thNight
16%7%29%35%13%
440
21st to endNight
13%5%31%34%16%1
389
June1st to 10thNight
15%6%35%30%13%1
360
11th to 20thNight
12%9%25%36%18%1
360
21st to endNight
14%5%23%39%16%3
360
July1st to 10thNight
8%6%26%43%17%1
350
11th to 20thNight
8%326%39%21%2
389
21st to endNight
10%426%36%23%2
591
August1st to 10thNight
9%5%24%37%22%3
537
11th to 20thNight
11%420%31%30%4
534
21st to endNight
12%6%24%33%22%4
594
September1st to 10thNight
15%8%25%27%19%6%
670
11th to 20thNight
12%8%27%32%15%7%
720
21st to endNight
19%8%26%26%16%4
720
October1st to 10thNight
21%12%26%27%13%2
720
11th to 20thNight
27%17%29%18%8%
720
21st to endNight
30%15%30%20%41
792
November1st to 10thNight
23%17%31%20%8%1
740
11th to 20thNight
23%23%29%19%7%
760
21st to endNight
28%19%31%17%5%
760
December1st to 10thNight
29%22%30%13%6%
798
11th to 20thNight
24%21%36%13%31
950
21st to endNight
31%18%31%16%4
1045
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