Rouyn-Noranda
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rouyn-Noranda clear sky chart from 2005-11-06 to 2024-01-12.

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
26%
23101
10%
74783
6%
23056
30%
23056
12%
57680

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
14%
950
6%
2838
4%
946
16%
946
6%
2470
January11th to 20thNight
18%
908
6%
2722
3%
908
22%
908
8%
2266
January21st to endNight
30%
819
9%
2677
7%
819
33%
819
10%
2149
February1st to 10thNight
22%
720
10%
2340
7%
720
28%
720
11%
1842
February11th to 20thNight
20%
703
10%
2275
4%
700
27%
700
11%
1787
February21st to endNight
19%
592
10%
1924
5%
592
27%
592
10%
1524
March1st to 10thNight
24%
720
12%
2040
7%
720
28%
720
13%
1603
March11th to 20thNight
22%
720
13%
1980
6%
720
28%
720
12%
1567
March21st to endNight
27%
792
18%
2165
9%
792
33%
792
20%
1568
April1st to 10thNight
23%
720
12%
1800
6%
720
25%
720
17%
1409
April11th to 20thNight
30%
591
16%
1655
9%
591
35%
591
19%
1177
April21st to endNight
31%
540
15%
1620
8%
540
37%
540
19%
1161
May1st to 10thNight
33%
378
14%
1458
14%
378
41%
378
17%
984
May11th to 20thNight
35%
354
15%
1415
16%
354
45%
354
16%
930
May21st to endNight
35%
389
10%
1498
8%
388
44%
388
17%
978
June1st to 10thNight
30%
360
9%
1260
6%
360
34%
360
16%
881
June11th to 20thNight
36%
360
11%
1260
7%
360
40%
360
22%
784
June21st to endNight
44%
360
8%
1260
6%
360
45%
360
21%
805
July1st to 10thNight
42%
350
10%
1225
8%
350
46%
350
20%
779
July11th to 20thNight
45%
348
12%
1218
12%
348
50%
348
24%
754
July21st to endNight
49%
394
12%
1428
15%
372
52%
372
19%
913
August1st to 10thNight
43%
465
11%
1529
11%
463
47%
463
21%
1022
August11th to 20thNight
45%
534
14%
1598
11%
534
49%
534
25%
1049
August21st to endNight
39%
625
14%
1813
9%
625
41%
625
20%
1268
September1st to 10thNight
38%
720
12%
1800
6%
720
39%
720
24%
1304
September11th to 20thNight
35%
720
13%
1853
6%
720
38%
720
23%
1337
September21st to endNight
36%
720
14%
2044
10%
720
40%
720
22%
1441
October1st to 10thNight
29%
720
14%
2160
11%
720
33%
720
16%
1594
October11th to 20thNight
17%
720
6%
2160
4%
720
21%
720
9%
1795
October21st to endNight
17%
792
7%
2491
4%
792
21%
792
9%
2053
November1st to 10thNight
17%
740
9%
2592
5%
740
23%
740
9%
2059
November11th to 20thNight
14%
760
7%
2660
4%
760
19%
760
6%
2219
November21st to endNight
9%
760
4%
2660
2%
760
11%
760
4%
2363
December1st to 10thNight
14%
769
5%
2669
2%
769
17%
769
5%
2335
December11th to 20thNight
18%
950
5%
3510
3%
949
21%
949
6%
3001
December21st to endNight
15%
1038
4%
5186
4%
1026
17%
1026
3%
4509

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
18%12%5%8%6%45%5%5%6%26%
74704
Night
17%13%6%9%7%45%45%5%25%
75006
TransparencyDay
58%6%11%17%7%1
74396
Night
61%5%11%15%7%1
74849
SeeingDay
23%14%31%21%9%2
14006
Night
24%12%30%25%8%1
23108

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%19%8%13%7%5%5%5%5%411%
1328
11th to 20thDay
16%14%7%13%8%36%7%7%7%13%
1267
21st to endDay
11%17%6%10%10%6%7%5%7%6%15%
1672
February1st to 10thDay
9%15%7%11%9%6%9%7%6%7%16%
1620
11th to 20thDay
11%17%7%10%8%5%6%5%5%6%20%
1573
21st to endDay
12%15%7%11%8%45%5%5%5%23%
1332
March1st to 10thDay
13%13%6%10%8%47%6%45%25%
1915
11th to 20thDay
14%14%6%9%7%45%345%29%
1980
21st to endDay
14%13%48%5%5%6%45%6%31%
2190
April1st to 10thDay
19%15%5%8%5%45%5%5%6%24%
2160
11th to 20thDay
19%9%5%9%6%34446%32%
2270
21st to endDay
19%12%47%5%35%445%32%
2340
May1st to 10thDay
16%10%36%7%35%5%5%8%31%
2500
11th to 20thDay
21%10%46%6%3445%5%32%
2478
21st to endDay
19%8%36%5%35%5%5%6%36%
2774
June1st to 10thDay
22%7%36%5%46%5%5%7%30%
2700
11th to 20thDay
15%7%37%5%35%5%6%7%36%
2700
21st to endDay
18%7%36%5%46%5%6%7%31%
2700
July1st to 10thDay
15%7%36%5%445%6%9%35%
2700
11th to 20thDay
14%6%36%6%36%6%6%10%33%
2700
21st to endDay
16%7%36%7%45%6%5%9%31%
2804
August1st to 10thDay
17%8%47%7%46%6%6%8%28%
2398
11th to 20thDay
18%8%35%6%35%5%6%7%33%
2303
21st to endDay
18%8%36%6%45%6%6%8%31%
2525
September1st to 10thDay
19%8%37%5%45%6%6%8%32%
2160
11th to 20thDay
22%8%35%6%35%46%7%31%
2106
21st to endDay
24%10%46%5%24446%31%
1915
October1st to 10thDay
23%11%37%5%345%45%30%
1800
11th to 20thDay
29%19%47%5%25%44417%
1800
21st to endDay
27%18%5%8%7%35%43415%
1860
November1st to 10thDay
21%20%7%9%6%3445%5%17%
1486
11th to 20thDay
21%16%8%14%8%45%43413%
1520
21st to endDay
26%20%9%12%8%343339%
1520
December1st to 10thDay
19%20%8%13%8%3445%5%11%
1506
11th to 20thDay
15%17%7%10%9%5%7%5%4415%
1671
21st to endDay
16%23%8%17%9%344339%
2431
January1st to 10thNight
14%19%8%14%10%45%44412%
2838
11th to 20thNight
16%16%8%11%8%36%6%6%415%
2722
21st to endNight
11%14%5%12%10%6%7%5%6%5%17%
2677
February1st to 10thNight
11%15%6%9%11%5%7%5%5%6%19%
2340
11th to 20thNight
12%15%7%10%9%45%5%35%23%
2273
21st to endNight
9%16%7%12%9%5%7%45%6%20%
1924
March1st to 10thNight
13%12%7%11%9%5%6%45%5%24%
2030
11th to 20thNight
17%13%6%9%8%46%44426%
1979
21st to endNight
14%12%49%5%35%446%35%
2165
April1st to 10thNight
20%15%6%7%6%3444428%
1800
11th to 20thNight
19%7%46%7%445%5%7%32%
1655
21st to endNight
20%11%48%5%3435%6%33%
1620
May1st to 10thNight
16%8%47%6%35%5%5%5%36%
1458
11th to 20thNight
20%7%35%435%5%5%7%35%
1415
21st to endNight
19%7%25%425%5%6%6%38%
1497
June1st to 10thNight
18%10%37%6%445%5%7%32%
1260
11th to 20thNight
14%6%35%5%35%5%5%7%42%
1260
21st to endNight
16%5%36%5%36%5%5%7%39%
1260
July1st to 10thNight
15%6%46%435%5%5%8%39%
1260
11th to 20thNight
15%5%35%5%35%6%7%9%38%
1260
21st to endNight
12%6%25%7%36%6%6%9%38%
1512
August1st to 10thNight
13%6%46%7%45%46%8%37%
1539
11th to 20thNight
14%6%26%7%4446%9%39%
1598
21st to endNight
18%7%47%6%345%6%7%35%
1813
September1st to 10thNight
17%7%36%6%345%5%6%37%
1800
11th to 20thNight
20%8%35%5%2445%6%37%
1853
21st to endNight
22%8%26%5%2445%6%36%
2044
October1st to 10thNight
21%10%46%6%34446%31%
2160
11th to 20thNight
27%17%5%8%6%3444418%
2160
21st to endNight
23%20%5%8%5%34445%18%
2491
November1st to 10thNight
19%16%6%9%6%45%45%5%21%
2592
11th to 20thNight
21%15%7%11%9%45%44416%
2660
21st to endNight
23%20%7%11%8%45%44410%
2660
December1st to 10thNight
17%21%8%13%9%45%43411%
2669
11th to 20thNight
17%18%7%11%11%46%5%3413%
3526
21st to endNight
19%20%10%15%10%3433311%
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
75%48%11%2
1329
11th to 20thDay
69%6%8%11%6%
1267
21st to endDay
69%46%13%8%
1672
February1st to 10thDay
66%6%8%14%7%
1620
11th to 20thDay
66%49%14%7%
1582
21st to endDay
64%39%17%6%1
1332
March1st to 10thDay
62%5%8%14%11%1
1918
11th to 20thDay
59%48%19%10%1
1980
21st to endDay
55%49%19%11%3
2190
April1st to 10thDay
61%5%10%14%8%1
2160
11th to 20thDay
54%49%21%10%1
2270
21st to endDay
54%5%9%16%14%2
2340
May1st to 10thDay
51%7%10%19%12%2
2500
11th to 20thDay
54%5%9%18%14%1
2482
21st to endDay
49%7%11%21%12%1
2774
June1st to 10thDay
53%6%11%20%10%1
2700
11th to 20thDay
46%6%11%22%13%2
2700
21st to endDay
50%7%12%21%10%1
2700
July1st to 10thDay
44%7%15%25%8%
2626
11th to 20thDay
45%7%16%23%8%
2619
21st to endDay
51%7%15%24%4
2648
August1st to 10thDay
54%9%14%20%3
2384
11th to 20thDay
48%8%18%18%7%1
2303
21st to endDay
49%7%15%21%7%
2525
September1st to 10thDay
50%8%13%21%7%1
2160
11th to 20thDay
52%7%17%20%4
2106
21st to endDay
56%5%13%21%6%
1915
October1st to 10thDay
57%5%12%17%7%1
1800
11th to 20thDay
71%6%9%11%3
1800
21st to endDay
73%5%8%9%3
1860
November1st to 10thDay
71%5%13%8%4
1486
11th to 20thDay
76%49%8%2
1520
21st to endDay
83%48%42
1520
December1st to 10thDay
76%310%9%2
1506
11th to 20thDay
71%5%6%14%2
1671
21st to endDay
80%5%6%7%1
2431
January1st to 10thNight
76%5%8%8%2
2838
11th to 20thNight
70%5%8%10%6%
2722
21st to endNight
67%47%13%8%1
2677
February1st to 10thNight
65%48%14%9%
2340
11th to 20thNight
64%5%9%15%7%
2275
21st to endNight
65%48%14%7%1
1924
March1st to 10thNight
63%48%15%9%1
2040
11th to 20thNight
63%48%13%9%2
1980
21st to endNight
53%49%16%15%4
2165
April1st to 10thNight
60%48%16%12%1
1800
11th to 20thNight
51%5%9%21%13%1
1655
21st to endNight
52%5%7%16%17%3
1620
May1st to 10thNight
49%6%10%19%13%3
1458
11th to 20thNight
47%6%10%19%14%2
1416
21st to endNight
45%8%12%19%14%2
1498
June1st to 10thNight
52%6%9%20%11%1
1260
11th to 20thNight
40%7%10%24%15%3
1260
21st to endNight
43%7%15%22%13%1
1260
July1st to 10thNight
42%8%13%26%11%
1225
11th to 20thNight
41%6%19%22%12%
1218
21st to endNight
42%9%17%27%5%
1428
August1st to 10thNight
46%6%18%24%5%
1529
11th to 20thNight
41%7%18%25%7%1
1598
21st to endNight
47%8%17%21%7%
1813
September1st to 10thNight
47%7%16%20%8%1
1800
11th to 20thNight
47%7%19%21%5%
1853
21st to endNight
48%6%14%25%6%
2044
October1st to 10thNight
55%6%14%17%8%1
2160
11th to 20thNight
70%5%10%13%2
2160
21st to endNight
69%5%11%10%41
2491
November1st to 10thNight
66%5%14%12%3
2592
11th to 20thNight
72%5%11%9%3
2660
21st to endNight
80%5%8%7%1
2660
December1st to 10thNight
79%48%8%2
2669
11th to 20thNight
75%48%10%3
3525
21st to endNight
80%36%8%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
26%21%36%13%31
180
11th to 20thDay
15%19%36%21%6%2
162
21st to endDay
21%11%36%23%8%1
229
February1st to 10thDay
15%25%40%16%31
240
11th to 20thDay
22%20%36%16%6%
240
21st to endDay
22%25%39%13%2
198
March1st to 10thDay
20%14%41%17%7%
406
11th to 20thDay
21%17%34%20%7%
420
21st to endDay
25%18%33%17%6%1
462
April1st to 10thDay
23%20%28%19%9%1
420
11th to 20thDay
23%18%28%22%7%2
412
21st to endDay
26%19%26%19%8%2
420
May1st to 10thDay
22%15%33%20%9%2
423
11th to 20thDay
26%14%29%19%8%4
447
21st to endDay
23%14%31%22%7%1
534
June1st to 10thDay
24%12%35%22%8%1
630
11th to 20thDay
19%18%29%23%9%2
630
21st to endDay
19%11%28%28%11%3
630
July1st to 10thDay
16%11%33%28%10%2
621
11th to 20thDay
16%10%31%26%15%1
618
21st to endDay
15%8%32%28%12%4
548
August1st to 10thDay
18%10%26%30%11%6%
446
11th to 20thDay
18%8%25%27%15%7%
439
21st to endDay
22%11%29%18%14%6%
495
September1st to 10thDay
21%10%31%23%12%4
450
11th to 20thDay
24%10%30%24%9%3
450
21st to endDay
30%10%26%19%13%2
450
October1st to 10thDay
28%13%29%18%9%3
450
11th to 20thDay
36%18%26%15%31
450
21st to endDay
36%15%30%15%31
408
November1st to 10thDay
33%21%36%8%2
180
11th to 20thDay
23%26%28%21%21
180
21st to endDay
42%16%31%7%22
180
December1st to 10thDay
29%14%31%16%9%1
180
11th to 20thDay
24%16%40%16%41
180
21st to endDay
32%13%34%15%6%1
198
January1st to 10thNight
24%14%35%22%5%1
950
11th to 20thNight
26%11%34%23%7%
908
21st to endNight
18%10%29%30%12%2
819
February1st to 10thNight
18%13%36%25%7%
720
11th to 20thNight
22%13%34%26%5%
703
21st to endNight
18%16%37%22%6%
592
March1st to 10thNight
19%18%32%23%7%1
720
11th to 20thNight
25%16%30%23%5%1
720
21st to endNight
20%12%35%26%6%1
792
April1st to 10thNight
27%13%30%23%7%1
720
11th to 20thNight
23%16%27%27%8%1
591
21st to endNight
23%9%31%29%7%1
540
May1st to 10thNight
21%9%31%29%10%
378
11th to 20thNight
23%10%27%30%7%2
354
21st to endNight
22%8%31%33%6%1
389
June1st to 10thNight
22%8%34%27%8%
360
11th to 20thNight
18%9%29%33%11%
360
21st to endNight
17%7%27%34%16%
360
July1st to 10thNight
17%7%26%38%11%1
350
11th to 20thNight
18%328%39%11%1
348
21st to endNight
13%6%26%36%17%2
394
August1st to 10thNight
18%427%30%20%1
465
11th to 20thNight
17%6%23%31%20%3
534
21st to endNight
23%7%24%28%16%2
625
September1st to 10thNight
21%9%29%27%14%1
720
11th to 20thNight
23%10%26%27%13%
720
21st to endNight
25%9%23%29%12%1
720
October1st to 10thNight
28%12%25%25%9%1
720
11th to 20thNight
36%14%27%17%6%1
720
21st to endNight
34%12%30%20%41
792
November1st to 10thNight
29%12%34%18%5%1
740
11th to 20thNight
30%15%31%18%5%1
760
21st to endNight
35%13%33%14%41
760
December1st to 10thNight
30%13%29%20%7%1
769
11th to 20thNight
28%13%31%21%6%1
950
21st to endNight
29%14%27%22%7%2
1045
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