Lake Superior Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Superior Provincial Park clear sky chart from 2005-11-06 to 2024-03-06.

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%
24164
9%
81136
7%
24063
33%
24063
12%
62617

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%
4592
3%
926
18%
926
4%
3897
January11th to 20thNight
18%
944
5%
4423
3%
930
20%
930
4%
3688
January21st to endNight
20%
1037
3%
4884
2%
1023
24%
1023
4%
4386
February1st to 10thNight
17%
881
5%
2591
2%
881
20%
881
8%
2213
February11th to 20thNight
20%
743
8%
2320
4%
740
24%
740
10%
1867
February21st to endNight
19%
628
9%
1884
4%
628
24%
628
11%
1503
March1st to 10thNight
27%
742
15%
2227
8%
742
33%
742
18%
1598
March11th to 20thNight
27%
720
16%
2012
7%
720
36%
720
20%
1454
March21st to endNight
32%
757
19%
2143
10%
757
41%
757
22%
1502
April1st to 10thNight
31%
540
10%
1800
7%
540
34%
540
15%
1309
April11th to 20thNight
36%
533
17%
1615
10%
533
41%
533
20%
1144
April21st to endNight
37%
540
15%
1620
9%
540
42%
540
23%
1094
May1st to 10thNight
43%
540
13%
1620
12%
540
46%
540
22%
1097
May11th to 20thNight
41%
523
16%
1442
12%
523
46%
523
23%
1004
May21st to endNight
48%
389
13%
1358
14%
388
51%
388
21%
862
June1st to 10thNight
46%
360
11%
1260
10%
360
49%
360
21%
805
June11th to 20thNight
46%
360
11%
1260
10%
360
47%
360
20%
824
June21st to endNight
51%
360
9%
1260
9%
360
52%
360
21%
818
July1st to 10thNight
54%
350
11%
1225
10%
350
56%
350
24%
766
July11th to 20thNight
55%
470
12%
1340
10%
470
56%
470
26%
896
July21st to endNight
53%
591
12%
1487
10%
558
54%
558
27%
1029
August1st to 10thNight
54%
537
13%
1476
11%
534
55%
534
30%
949
August11th to 20thNight
61%
534
16%
1598
15%
534
63%
534
33%
953
August21st to endNight
45%
594
16%
1784
12%
594
48%
594
24%
1177
September1st to 10thNight
45%
558
15%
1818
12%
558
49%
558
24%
1168
September11th to 20thNight
40%
720
14%
1980
8%
720
43%
720
23%
1400
September21st to endNight
40%
720
13%
1980
10%
720
42%
720
21%
1407
October1st to 10thNight
30%
720
13%
2020
8%
720
35%
720
18%
1505
October11th to 20thNight
22%
720
9%
2263
5%
720
27%
720
11%
1814
October21st to endNight
19%
792
7%
2574
5%
792
24%
792
8%
2125
November1st to 10thNight
18%
740
11%
2406
7%
740
24%
740
9%
1922
November11th to 20thNight
15%
760
6%
2593
4%
760
19%
760
5%
2213
November21st to endNight
14%
878
3%
2778
1%
878
15%
878
6%
2426
December1st to 10thNight
14%
950
4%
2850
2%
950
16%
950
5%
2523
December11th to 20thNight
14%
949
6%
3475
2%
948
16%
948
6%
2924
December21st to endNight
12%
1039
3%
5178
1%
1026
15%
1026
3%
4355

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
16%12%5%8%6%35%45%7%30%
78106
Night
15%14%6%9%7%3445%6%26%
81447
TransparencyDay
54%7%13%18%8%1
77803
Night
59%8%11%15%7%1
81286
SeeingDay
21%11%28%26%11%2
14574
Night
22%11%29%27%11%1
24191

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
10%23%13%14%9%45%4449%
2338
11th to 20thDay
9%13%6%15%9%5%6%5%6%6%20%
2530
21st to endDay
7%19%13%15%9%45%5%6%5%12%
2783
February1st to 10thDay
8%15%6%10%13%8%6%5%5%6%18%
1587
11th to 20thDay
10%15%7%10%10%45%5%45%23%
1746
21st to endDay
8%15%9%14%8%45%45%7%21%
1570
March1st to 10thDay
11%12%5%11%5%345%47%32%
1848
11th to 20thDay
12%14%47%6%35%446%34%
1947
21st to endDay
16%10%47%6%35%447%33%
2227
April1st to 10thDay
17%14%5%8%5%2445%7%28%
2160
11th to 20thDay
20%11%47%43445%6%32%
2293
21st to endDay
16%11%46%5%345%6%8%32%
2340
May1st to 10thDay
15%9%36%5%45%5%6%7%35%
2340
11th to 20thDay
19%7%35%5%35%45%6%38%
2449
21st to endDay
17%7%35%435%46%8%39%
2919
June1st to 10thDay
18%6%26%5%46%5%6%8%34%
2700
11th to 20thDay
15%7%36%5%45%46%9%36%
2700
21st to endDay
18%7%25%435%45%8%38%
2700
July1st to 10thDay
15%6%25%4345%5%9%43%
2700
11th to 20thDay
16%7%244245%6%7%42%
2573
21st to endDay
18%6%2433445%9%41%
2743
August1st to 10thDay
13%6%25%5%445%6%9%41%
2453
11th to 20thDay
16%6%35%435%5%5%8%42%
2303
21st to endDay
20%7%25%43445%7%39%
2570
September1st to 10thDay
22%7%26%5%3345%7%37%
2124
11th to 20thDay
23%6%244245%6%8%37%
1980
21st to endDay
25%7%36%5%3435%7%32%
1980
October1st to 10thDay
23%11%46%43445%5%30%
1940
11th to 20thDay
28%17%47%7%43445%17%
1693
21st to endDay
24%19%5%7%7%345%45%19%
1782
November1st to 10thDay
21%21%5%8%5%245%45%19%
1672
11th to 20thDay
18%18%8%10%6%35%5%46%17%
1584
21st to endDay
18%26%7%9%6%35%5%45%12%
1400
December1st to 10thDay
12%24%11%14%9%4433314%
1330
11th to 20thDay
14%19%7%15%8%445%5%5%15%
1671
21st to endDay
20%22%7%12%5%3445%414%
2431
January1st to 10thNight
11%21%11%16%6%34445%15%
4616
11th to 20thNight
8%15%10%15%13%45%445%17%
4440
21st to endNight
10%17%13%17%10%46%44412%
4884
February1st to 10thNight
8%17%8%13%14%5%6%5%5%5%15%
2591
11th to 20thNight
10%13%7%14%9%46%5%6%6%20%
2318
21st to endNight
10%17%8%11%9%5%6%445%21%
1884
March1st to 10thNight
10%11%6%11%6%45%5%5%6%32%
2216
11th to 20thNight
13%13%47%6%4446%6%34%
2011
21st to endNight
12%10%5%7%6%45%45%7%36%
2143
April1st to 10thNight
19%12%5%6%5%45%5%5%7%29%
1800
11th to 20thNight
18%11%5%6%5%34446%34%
1615
21st to endNight
17%10%46%5%3435%7%37%
1620
May1st to 10thNight
15%8%46%6%35%45%8%35%
1620
11th to 20thNight
18%9%35%5%345%6%7%36%
1442
21st to endNight
15%7%44445%446%43%
1357
June1st to 10thNight
16%6%35%6%25%5%48%39%
1260
11th to 20thNight
18%9%46%32345%8%38%
1260
21st to endNight
15%7%26%5%45%45%7%40%
1260
July1st to 10thNight
12%7%36%6%345%5%9%40%
1260
11th to 20thNight
15%6%26%5%45%5%5%8%39%
1384
21st to endNight
18%7%35%5%3435%8%39%
1575
August1st to 10thNight
13%8%25%5%35%5%6%8%42%
1485
11th to 20thNight
11%425%5%3345%7%50%
1598
21st to endNight
18%8%25%5%2345%6%41%
1784
September1st to 10thNight
17%7%35%424447%43%
1818
11th to 20thNight
22%6%245%2445%8%38%
1980
21st to endNight
25%7%35%4235%47%35%
1980
October1st to 10thNight
25%10%35%5%3445%5%32%
2020
11th to 20thNight
27%14%36%6%33446%22%
2263
21st to endNight
25%18%48%5%34445%20%
2574
November1st to 10thNight
21%19%6%8%5%34445%21%
2406
11th to 20thNight
21%19%7%10%6%3445%5%16%
2593
21st to endNight
18%22%8%10%5%35%45%5%15%
2778
December1st to 10thNight
12%23%10%14%6%34435%14%
2850
11th to 20thNight
14%22%9%12%7%34445%17%
3526
21st to endNight
15%22%8%12%7%35%45%6%13%
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
78%7%8%6%1
2339
11th to 20thDay
65%8%12%12%2
2530
21st to endDay
72%10%9%5%4
2783
February1st to 10thDay
66%8%11%10%5%
1587
11th to 20thDay
62%8%12%11%7%1
1755
21st to endDay
62%5%10%12%8%1
1570
March1st to 10thDay
52%6%14%14%12%3
1850
11th to 20thDay
51%6%13%20%9%2
1947
21st to endDay
52%5%13%17%10%3
2227
April1st to 10thDay
55%6%12%17%9%1
2160
11th to 20thDay
52%411%20%11%1
2293
21st to endDay
48%6%10%20%13%4
2340
May1st to 10thDay
47%7%12%22%10%3
2340
11th to 20thDay
45%5%11%24%14%1
2453
21st to endDay
43%8%14%23%10%3
2919
June1st to 10thDay
46%8%13%20%12%2
2700
11th to 20thDay
43%8%14%22%12%1
2700
21st to endDay
43%8%14%23%10%1
2700
July1st to 10thDay
38%9%16%26%11%1
2626
11th to 20thDay
39%7%17%27%8%1
2495
21st to endDay
40%9%17%24%9%
2591
August1st to 10thDay
38%9%21%23%9%1
2438
11th to 20thDay
39%7%17%29%8%
2303
21st to endDay
44%8%16%22%9%1
2570
September1st to 10thDay
47%6%15%22%10%
2124
11th to 20thDay
45%7%21%23%4
1980
21st to endDay
51%6%17%20%5%
1980
October1st to 10thDay
56%6%15%18%41
1940
11th to 20thDay
69%7%11%11%2
1693
21st to endDay
68%6%9%11%6%
1782
November1st to 10thDay
67%6%11%13%3
1672
11th to 20thDay
67%9%11%8%4
1584
21st to endDay
76%9%7%6%2
1400
December1st to 10thDay
76%6%7%8%2
1330
11th to 20thDay
72%8%10%8%2
1671
21st to endDay
73%7%9%6%5%
2431
January1st to 10thNight
72%9%8%7%4
4616
11th to 20thNight
70%9%11%9%2
4440
21st to endNight
76%10%5%6%3
4884
February1st to 10thNight
70%8%9%9%4
2591
11th to 20thNight
63%9%13%11%4
2320
21st to endNight
63%7%11%12%7%
1884
March1st to 10thNight
51%7%12%17%13%
2227
11th to 20thNight
49%7%12%19%11%1
2012
21st to endNight
48%5%11%20%13%3
2143
April1st to 10thNight
55%6%11%17%11%1
1800
11th to 20thNight
52%410%21%11%2
1615
21st to endNight
47%413%18%15%3
1620
May1st to 10thNight
47%5%12%21%12%4
1620
11th to 20thNight
47%5%9%23%13%1
1443
21st to endNight
42%7%12%22%14%3
1358
June1st to 10thNight
42%7%12%21%16%2
1260
11th to 20thNight
44%8%12%20%14%2
1260
21st to endNight
42%9%13%24%11%1
1260
July1st to 10thNight
38%9%15%24%13%
1225
11th to 20thNight
42%7%13%25%12%1
1340
21st to endNight
43%7%14%25%11%
1487
August1st to 10thNight
39%6%19%25%11%
1476
11th to 20thNight
34%6%20%30%10%
1598
21st to endNight
44%5%14%26%11%
1784
September1st to 10thNight
41%7%14%27%10%1
1818
11th to 20thNight
44%9%16%24%6%1
1980
21st to endNight
48%7%17%22%6%
1980
October1st to 10thNight
54%7%14%20%5%1
2020
11th to 20thNight
64%7%12%14%3
2263
21st to endNight
67%8%9%12%4
2574
November1st to 10thNight
65%6%10%14%4
2406
11th to 20thNight
71%9%9%9%3
2593
21st to endNight
71%10%12%5%1
2778
December1st to 10thNight
73%10%7%7%2
2850
11th to 20thNight
70%7%9%8%32
3525
21st to endNight
71%9%9%9%1
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
22%18%31%17%10%2
218
11th to 20thDay
16%15%35%24%8%1
270
21st to endDay
16%10%38%27%7%
297
February1st to 10thDay
18%19%36%20%6%1
270
11th to 20thDay
20%19%38%17%41
270
21st to endDay
19%25%41%14%1
225
March1st to 10thDay
17%16%40%21%5%
255
11th to 20thDay
21%14%32%24%7%2
387
21st to endDay
22%15%32%23%7%1
462
April1st to 10thDay
22%11%34%27%6%1
420
11th to 20thDay
25%11%31%19%11%2
412
21st to endDay
21%11%32%23%10%3
420
May1st to 10thDay
21%11%31%24%10%3
423
11th to 20thDay
21%7%32%26%11%3
589
21st to endDay
21%7%29%29%11%2
679
June1st to 10thDay
19%7%32%30%10%1
630
11th to 20thDay
18%9%29%31%12%2
630
21st to endDay
19%6%25%31%15%3
630
July1st to 10thDay
14%6%26%37%15%2
621
11th to 20thDay
17%7%21%35%17%3
618
21st to endDay
20%423%34%16%4
684
August1st to 10thDay
12%8%23%33%21%4
572
11th to 20thDay
17%5%16%33%23%6%
439
21st to endDay
26%7%20%29%13%4
495
September1st to 10thDay
24%10%24%21%17%4
450
11th to 20thDay
23%8%27%28%12%2
450
21st to endDay
28%10%19%26%16%1
450
October1st to 10thDay
28%12%21%26%10%2
450
11th to 20thDay
35%14%28%20%3
343
21st to endDay
34%13%34%15%4
297
November1st to 10thDay
30%15%30%20%6%
270
11th to 20thDay
22%27%32%13%5%
210
21st to endDay
26%22%37%13%2
180
December1st to 10thDay
24%24%26%17%9%1
180
11th to 20thDay
21%19%39%14%6%1
180
21st to endDay
26%21%34%12%7%1
198
January1st to 10thNight
21%16%36%21%5%
950
11th to 20thNight
19%15%34%25%6%1
950
21st to endNight
19%10%34%29%8%1
1045
February1st to 10thNight
16%13%40%25%5%1
881
11th to 20thNight
16%14%38%23%8%1
743
21st to endNight
19%14%35%28%4
628
March1st to 10thNight
15%10%38%29%8%1
743
11th to 20thNight
20%11%37%25%7%1
720
21st to endNight
15%10%34%30%10%1
757
April1st to 10thNight
26%8%28%28%8%2
540
11th to 20thNight
24%7%26%32%10%1
533
21st to endNight
19%9%27%28%16%1
540
May1st to 10thNight
19%6%23%39%11%1
540
11th to 20thNight
22%6%24%28%16%3
523
21st to endNight
17%7%24%35%17%1
389
June1st to 10thNight
17%5%23%39%16%1
360
11th to 20thNight
20%8%19%38%15%1
360
21st to endNight
15%5%22%32%23%3
360
July1st to 10thNight
14%320%39%23%2
350
11th to 20thNight
18%316%37%24%2
470
21st to endNight
21%414%36%22%4
591
August1st to 10thNight
17%5%17%34%25%2
537
11th to 20thNight
13%414%37%28%3
534
21st to endNight
21%423%31%18%3
594
September1st to 10thNight
18%6%24%28%18%5%
558
11th to 20thNight
23%7%25%29%14%2
720
21st to endNight
27%8%19%29%14%2
720
October1st to 10thNight
29%7%27%23%13%1
720
11th to 20thNight
36%13%24%20%6%
720
21st to endNight
35%13%26%22%5%
792
November1st to 10thNight
31%14%31%19%5%
740
11th to 20thNight
29%17%30%18%6%1
760
21st to endNight
28%16%32%19%4
878
December1st to 10thNight
25%15%34%20%6%1
950
11th to 20thNight
22%17%37%17%6%1
950
21st to endNight
27%16%32%19%6%
1045
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