Elliot Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Elliot Lake clear sky chart from 2005-11-06 to 2024-09-29.

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%
24418
13%
94997
7%
24196
36%
24196
14%
65748

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
15%
947
8%
4698
4%
926
21%
926
7%
3552
January11th to 20thNight
18%
948
9%
4420
4%
930
24%
930
7%
3373
January21st to endNight
21%
1011
6%
4825
4%
996
27%
996
7%
3967
February1st to 10thNight
18%
760
13%
2470
5%
760
27%
760
11%
1864
February11th to 20thNight
21%
741
13%
2394
5%
739
30%
739
13%
1773
February21st to endNight
20%
628
12%
1884
4%
628
28%
628
14%
1427
March1st to 10thNight
23%
758
20%
3614
6%
745
33%
745
13%
2266
March11th to 20thNight
24%
755
18%
3455
6%
740
35%
740
14%
2178
March21st to endNight
25%
831
11%
3745
8%
814
34%
814
14%
2414
April1st to 10thNight
24%
652
14%
1935
7%
652
31%
652
18%
1374
April11th to 20thNight
30%
563
20%
1687
10%
563
38%
563
22%
1140
April21st to endNight
29%
570
15%
1710
8%
570
35%
570
19%
1196
May1st to 10thNight
36%
568
17%
2784
8%
559
42%
559
14%
1706
May11th to 20thNight
37%
466
13%
2605
14%
458
48%
458
14%
1515
May21st to endNight
38%
409
12%
2408
10%
399
49%
399
14%
1386
June1st to 10thNight
33%
380
12%
1330
9%
380
41%
380
23%
817
June11th to 20thNight
40%
380
12%
1330
10%
380
45%
380
22%
823
June21st to endNight
41%
380
11%
1330
8%
380
47%
380
22%
856
July1st to 10thNight
48%
365
14%
2096
13%
360
56%
360
18%
1219
July11th to 20thNight
50%
408
15%
1956
16%
402
55%
402
21%
1067
July21st to endNight
50%
607
11%
2265
10%
569
53%
569
23%
1362
August1st to 10thNight
52%
560
15%
2572
11%
545
58%
545
20%
1564
August11th to 20thNight
52%
553
12%
2626
11%
543
59%
543
20%
1571
August21st to endNight
46%
610
15%
2779
10%
605
52%
605
21%
1514
September1st to 10thNight
43%
674
18%
1907
10%
674
48%
674
28%
1236
September11th to 20thNight
49%
760
18%
2090
11%
760
53%
760
35%
1277
September21st to endNight
41%
756
18%
2079
13%
756
45%
756
24%
1434
October1st to 10thNight
34%
720
16%
2087
11%
720
40%
720
21%
1465
October11th to 20thNight
24%
720
14%
2160
6%
720
33%
720
15%
1609
October21st to endNight
23%
792
12%
2560
7%
792
30%
792
13%
1912
November1st to 10thNight
25%
740
15%
2420
11%
740
33%
740
16%
1714
November11th to 20thNight
20%
760
11%
2660
6%
760
28%
760
11%
2027
November21st to endNight
16%
760
10%
2660
5%
760
24%
760
9%
2097
December1st to 10thNight
17%
897
11%
2797
3%
897
25%
897
11%
2167
December11th to 20thNight
16%
950
10%
3469
3%
948
22%
948
9%
2655
December21st to endNight
13%
1039
5%
5190
1%
1026
18%
1026
5%
4231

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%5%4445%7%34%
101177
Night
15%12%48%5%4435%6%33%
97138
TransparencyDay
48%7%12%20%11%1
100924
Night
50%7%12%20%10%1
97010
SeeingDay
20%15%33%22%8%2
15294
Night
21%11%31%27%9%1
24525

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
13%21%8%11%5%4335%5%21%
2217
11th to 20thDay
10%15%6%13%10%7%6%46%6%18%
2530
21st to endDay
14%23%11%15%6%4434313%
2820
February1st to 10thDay
10%14%6%13%7%6%5%5%5%5%24%
1710
11th to 20thDay
11%16%411%6%6%445%6%27%
1667
21st to endDay
10%16%7%11%6%6%5%446%24%
1570
March1st to 10thDay
14%14%48%44445%7%31%
3203
11th to 20thDay
10%15%5%9%5%45%45%6%32%
3480
21st to endDay
13%11%9%10%5%4445%6%30%
3815
April1st to 10thDay
17%13%49%5%5%5%45%6%29%
2260
11th to 20thDay
20%10%37%5%44347%33%
2442
21st to endDay
19%11%36%5%3435%7%35%
2470
May1st to 10thDay
18%7%26%44446%7%38%
4108
11th to 20thDay
13%8%37%44435%7%41%
4232
21st to endDay
15%7%26%43336%7%44%
5152
June1st to 10thDay
16%6%27%44446%8%38%
2850
11th to 20thDay
14%7%26%5%5%445%8%38%
2850
21st to endDay
18%7%25%5%5%5%45%7%36%
2850
July1st to 10thDay
16%8%36%445%46%8%35%
4760
11th to 20thDay
11%5%25%5%5%5%46%8%44%
4670
21st to endDay
12%5%25%43445%8%49%
4790
August1st to 10thDay
10%6%37%5%5%6%47%9%40%
4104
11th to 20thDay
15%5%27%45%446%7%41%
4044
21st to endDay
15%5%26%44445%7%43%
4532
September1st to 10thDay
14%7%38%44445%8%40%
2251
11th to 20thDay
15%5%27%445%35%7%43%
2090
21st to endDay
20%7%37%444247%37%
2069
October1st to 10thDay
21%8%36%44445%7%34%
1872
11th to 20thDay
23%13%38%5%5%5%35%6%23%
1800
21st to endDay
23%14%38%5%44447%23%
1792
November1st to 10thDay
21%11%39%5%5%445%7%26%
1655
11th to 20thDay
16%17%5%11%5%4435%6%24%
1520
21st to endDay
19%25%5%9%5%3334419%
1520
December1st to 10thDay
12%21%5%11%445%45%423%
1380
11th to 20thDay
16%20%6%10%6%44345%22%
1671
21st to endDay
24%24%5%10%43433318%
2431
January1st to 10thNight
14%16%6%12%6%4435%6%24%
4734
11th to 20thNight
10%15%6%15%9%45%45%6%21%
4440
21st to endNight
14%18%9%13%7%5%5%34419%
4844
February1st to 10thNight
11%15%5%11%8%6%445%5%26%
2470
11th to 20thNight
11%14%411%7%5%445%6%28%
2394
21st to endNight
11%16%6%10%5%5%6%346%28%
1884
March1st to 10thNight
16%10%38%444347%38%
3637
11th to 20thNight
9%11%5%10%5%5%4346%38%
3479
21st to endNight
13%10%6%9%5%44346%37%
3817
April1st to 10thNight
19%11%27%445%45%7%33%
1935
11th to 20thNight
20%7%26%5%44345%39%
1687
21st to endNight
19%9%37%5%5%335%5%36%
1710
May1st to 10thNight
17%7%27%45%445%6%39%
2833
11th to 20thNight
11%9%37%6%5%447%8%37%
2659
21st to endNight
15%8%35%34436%7%41%
2432
June1st to 10thNight
13%7%36%44445%8%41%
1330
11th to 20thNight
12%6%26%5%5%5%5%5%8%40%
1330
21st to endNight
14%7%37%5%45%45%6%41%
1330
July1st to 10thNight
15%7%25%44446%8%42%
2210
11th to 20thNight
11%5%25%434447%52%
2296
21st to endNight
9%5%25%34445%7%51%
2771
August1st to 10thNight
8%8%37%45%45%7%8%42%
2825
11th to 20thNight
13%5%25%43446%8%45%
2785
21st to endNight
11%5%25%443346%52%
3124
September1st to 10thNight
14%6%35%444447%44%
1907
11th to 20thNight
13%41434336%7%51%
2090
21st to endNight
18%7%27%444347%40%
2079
October1st to 10thNight
21%8%26%45%3345%38%
2087
11th to 20thNight
23%10%28%5%45%35%6%29%
2160
21st to endNight
26%11%36%5%4435%6%28%
2560
November1st to 10thNight
17%11%49%44346%7%32%
2420
11th to 20thNight
19%13%49%6%5%5%45%5%25%
2660
21st to endNight
19%19%5%9%44445%5%23%
2660
December1st to 10thNight
15%19%5%8%6%4445%5%24%
2797
11th to 20thNight
17%17%5%9%5%44345%25%
3526
21st to endNight
22%23%6%10%43333418%
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
66%6%13%11%4
2218
11th to 20thDay
64%8%12%10%5%1
2530
21st to endDay
75%6%5%7%6%1
2820
February1st to 10thDay
59%7%12%14%7%1
1710
11th to 20thDay
55%8%10%15%10%1
1676
21st to endDay
59%7%8%15%10%1
1570
March1st to 10thDay
50%8%15%12%14%2
3206
11th to 20thDay
50%6%11%22%9%2
3480
21st to endDay
51%9%11%14%11%4
3815
April1st to 10thDay
55%6%10%16%11%2
2260
11th to 20thDay
50%6%10%21%11%2
2442
21st to endDay
48%6%9%18%15%4
2470
May1st to 10thDay
42%8%11%23%15%2
4120
11th to 20thDay
40%7%13%23%15%2
4236
21st to endDay
38%7%13%18%18%6%
5152
June1st to 10thDay
42%7%12%23%14%2
2850
11th to 20thDay
43%6%11%22%16%1
2850
21st to endDay
46%7%11%21%13%2
2850
July1st to 10thDay
45%7%15%22%11%1
4686
11th to 20thDay
36%6%15%32%10%1
4589
21st to endDay
33%6%11%33%17%
4638
August1st to 10thDay
39%7%13%29%11%1
4091
11th to 20thDay
41%6%17%25%10%
4083
21st to endDay
40%7%14%29%10%1
4531
September1st to 10thDay
42%7%14%24%12%1
2251
11th to 20thDay
40%6%16%27%11%
2090
21st to endDay
48%5%15%24%8%
2069
October1st to 10thDay
50%7%12%23%8%
1872
11th to 20thDay
60%9%10%16%5%
1800
21st to endDay
61%8%12%11%7%1
1792
November1st to 10thDay
56%7%13%17%7%
1655
11th to 20thDay
60%8%13%14%6%
1520
21st to endDay
69%5%12%10%5%
1520
December1st to 10thDay
62%7%10%14%6%1
1380
11th to 20thDay
64%6%10%13%5%1
1671
21st to endDay
72%5%7%11%6%
2431
January1st to 10thNight
60%8%12%12%7%1
4734
11th to 20thNight
62%7%12%13%5%
4440
21st to endNight
69%6%7%12%6%
4844
February1st to 10thNight
59%6%10%16%8%1
2470
11th to 20thNight
56%7%13%17%8%1
2396
21st to endNight
56%7%11%16%9%1
1884
March1st to 10thNight
46%7%12%20%15%1
3647
11th to 20thNight
45%8%14%22%10%2
3480
21st to endNight
47%6%13%18%14%2
3817
April1st to 10thNight
50%7%10%20%13%1
1935
11th to 20thNight
46%5%7%25%15%2
1687
21st to endNight
50%5%9%19%14%4
1710
May1st to 10thNight
44%7%9%26%13%2
2840
11th to 20thNight
41%7%10%26%14%1
2660
21st to endNight
40%9%12%21%13%6%
2433
June1st to 10thNight
39%7%15%23%15%2
1330
11th to 20thNight
39%7%13%22%17%2
1330
21st to endNight
42%8%14%22%13%2
1330
July1st to 10thNight
40%6%14%25%14%2
2175
11th to 20thNight
32%5%15%34%14%
2254
21st to endNight
33%6%12%30%20%
2683
August1st to 10thNight
38%6%15%28%12%1
2814
11th to 20thNight
36%9%19%26%10%1
2812
21st to endNight
33%5%14%32%16%1
3124
September1st to 10thNight
38%7%15%25%12%2
1907
11th to 20thNight
32%7%19%32%10%
2090
21st to endNight
45%7%15%25%9%
2079
October1st to 10thNight
48%6%12%23%10%
2087
11th to 20thNight
55%6%14%19%5%
2160
21st to endNight
57%6%12%16%7%1
2560
November1st to 10thNight
50%7%14%20%8%
2420
11th to 20thNight
60%7%12%14%7%
2660
21st to endNight
63%7%11%12%6%1
2660
December1st to 10thNight
61%6%12%17%4
2797
11th to 20thNight
60%7%11%12%7%2
3525
21st to endNight
71%5%8%11%5%
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%21%31%18%6%1
184
11th to 20thDay
19%15%36%23%6%1
270
21st to endDay
22%16%35%20%7%1
297
February1st to 10thDay
21%26%35%13%5%
270
11th to 20thDay
20%24%40%12%4
270
21st to endDay
25%27%39%8%
225
March1st to 10thDay
20%24%40%13%31
317
11th to 20thDay
20%16%38%20%5%1
460
21st to endDay
25%17%34%18%5%1
506
April1st to 10thDay
21%16%36%21%6%1
460
11th to 20thDay
30%19%23%17%8%2
452
21st to endDay
29%14%30%19%7%2
460
May1st to 10thDay
21%15%35%20%6%3
463
11th to 20thDay
17%15%32%22%10%3
487
21st to endDay
17%14%36%23%8%2
714
June1st to 10thDay
17%15%38%23%6%1
680
11th to 20thDay
19%14%36%22%8%1
680
21st to endDay
21%14%33%22%8%3
680
July1st to 10thDay
11%11%38%29%8%2
671
11th to 20thDay
13%9%34%29%10%4
668
21st to endDay
15%8%33%28%11%5%
727
August1st to 10thDay
14%9%27%29%16%5%
486
11th to 20thDay
15%6%25%28%16%10%
479
21st to endDay
17%8%28%28%13%6%
539
September1st to 10thDay
17%12%27%26%12%5%
490
11th to 20thDay
17%8%26%32%12%5%
490
21st to endDay
23%12%27%23%12%3
483
October1st to 10thDay
28%14%25%20%11%2
450
11th to 20thDay
27%17%33%18%41
450
21st to endDay
28%20%34%17%1
307
November1st to 10thDay
28%20%33%17%3
261
11th to 20thDay
25%22%35%15%3
180
21st to endDay
31%22%29%14%3
180
December1st to 10thDay
22%16%33%22%7%1
180
11th to 20thDay
29%23%32%12%3
180
21st to endDay
32%19%37%9%31
198
January1st to 10thNight
24%13%35%23%5%
950
11th to 20thNight
23%13%32%24%7%1
950
21st to endNight
21%9%32%27%10%
1018
February1st to 10thNight
18%14%41%23%4
760
11th to 20thNight
19%14%36%23%7%
743
21st to endNight
18%16%37%25%41
628
March1st to 10thNight
16%14%40%26%41
760
11th to 20thNight
19%13%37%23%6%1
760
21st to endNight
19%12%36%26%6%1
836
April1st to 10thNight
23%12%33%26%5%
652
11th to 20thNight
25%9%31%25%9%1
563
21st to endNight
21%13%29%28%8%1
570
May1st to 10thNight
17%9%30%34%10%1
570
11th to 20thNight
18%8%29%35%9%1
473
21st to endNight
16%8%34%32%11%
411
June1st to 10thNight
13%7%42%31%7%
380
11th to 20thNight
15%7%32%37%9%
380
21st to endNight
15%7%26%39%12%1
380
July1st to 10thNight
11%7%28%45%9%
370
11th to 20thNight
12%5%26%40%17%1
415
21st to endNight
14%425%39%17%2
624
August1st to 10thNight
12%227%39%19%1
567
11th to 20thNight
14%321%33%26%2
564
21st to endNight
17%6%22%37%17%1
627
September1st to 10thNight
18%7%26%28%19%3
674
11th to 20thNight
15%6%27%30%19%3
760
21st to endNight
21%7%25%31%14%2
756
October1st to 10thNight
25%8%29%25%12%2
720
11th to 20thNight
29%12%28%24%7%
720
21st to endNight
30%14%28%23%41
792
November1st to 10thNight
23%13%31%25%7%1
740
11th to 20thNight
25%13%33%24%5%
760
21st to endNight
30%14%31%19%5%1
760
December1st to 10thNight
25%15%34%20%6%
897
11th to 20thNight
27%16%32%19%41
950
21st to endNight
31%14%32%18%5%
1045
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