Chibougamau
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Chibougamau 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%
22422
8%
74390
6%
22377
29%
22377
10%
59801

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
18%
760
6%
2649
5%
757
20%
757
5%
2359
January11th to 20thNight
21%
725
8%
2535
4%
725
25%
725
7%
2072
January21st to endNight
31%
792
10%
2772
9%
792
34%
792
9%
2239
February1st to 10thNight
32%
720
10%
2475
8%
720
37%
720
9%
1983
February11th to 20thNight
25%
703
6%
2275
6%
700
27%
700
8%
1925
February21st to endNight
26%
592
12%
1788
8%
592
32%
592
11%
1428
March1st to 10thNight
31%
720
13%
2160
9%
720
36%
720
14%
1670
March11th to 20thNight
25%
720
11%
2072
7%
720
28%
720
11%
1700
March21st to endNight
25%
792
15%
2001
6%
792
30%
792
15%
1599
April1st to 10thNight
23%
720
10%
1800
4%
720
27%
720
14%
1457
April11th to 20thNight
30%
687
14%
1751
8%
687
34%
687
19%
1324
April21st to endNight
30%
426
14%
1506
12%
426
37%
426
15%
1074
May1st to 10thNight
30%
360
12%
1440
10%
360
39%
360
14%
1006
May11th to 20thNight
33%
354
12%
1415
11%
354
42%
354
15%
972
May21st to endNight
29%
389
8%
1515
6%
388
35%
388
15%
1046
June1st to 10thNight
31%
360
6%
1260
2%
360
33%
360
16%
887
June11th to 20thNight
35%
360
5%
1080
0%
360
35%
360
19%
772
June21st to endNight
44%
360
5%
1080
0%
360
44%
360
23%
743
July1st to 10thNight
36%
350
5%
1154
1%
350
37%
350
19%
800
July11th to 20thNight
47%
348
7%
1381
8%
348
48%
348
20%
873
July21st to endNight
44%
394
7%
1486
12%
372
47%
372
13%
1066
August1st to 10thNight
41%
358
8%
1422
11%
356
43%
356
13%
1017
August11th to 20thNight
44%
356
12%
1420
12%
356
48%
356
15%
977
August21st to endNight
38%
759
10%
1947
6%
759
39%
759
19%
1491
September1st to 10thNight
36%
720
10%
1800
5%
720
37%
720
20%
1361
September11th to 20thNight
31%
720
9%
1840
4%
720
33%
720
17%
1434
September21st to endNight
29%
720
11%
1981
7%
720
33%
720
18%
1500
October1st to 10thNight
27%
720
13%
2160
8%
720
33%
720
14%
1633
October11th to 20thNight
17%
720
6%
2236
4%
720
20%
720
7%
1927
October21st to endNight
16%
792
6%
2574
3%
792
20%
792
6%
2223
November1st to 10thNight
12%
740
5%
2483
3%
740
15%
740
4%
2215
November11th to 20thNight
12%
760
5%
2660
3%
760
15%
760
4%
2367
November21st to endNight
11%
823
1%
2791
1%
823
12%
823
2%
2596
December1st to 10thNight
16%
850
3%
2850
2%
850
18%
850
4%
2587
December11th to 20thNight
22%
850
5%
3513
5%
849
24%
849
5%
3026
December21st to endNight
17%
902
3%
5118
4%
889
20%
889
2%
4452

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%9%8%46%5%5%6%21%
75054
Night
17%14%6%11%8%46%5%5%5%20%
74628
TransparencyDay
63%6%10%14%7%1
74754
Night
66%6%9%13%6%
74464
SeeingDay
24%12%29%22%10%2
14279
Night
24%11%29%26%10%1
22437

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
12%19%8%16%10%6%5%6%6%5%7%
1517
11th to 20thDay
13%14%7%12%10%6%7%6%7%7%10%
1448
21st to endDay
8%13%5%13%12%6%8%8%8%8%11%
1584
February1st to 10thDay
6%10%6%13%13%7%9%9%7%6%13%
1483
11th to 20thDay
10%16%5%15%11%47%9%6%6%10%
1573
21st to endDay
7%14%8%10%11%5%7%6%7%7%16%
1467
March1st to 10thDay
11%12%6%12%9%5%6%8%7%6%19%
1797
11th to 20thDay
11%13%7%10%10%6%6%6%4423%
1885
21st to endDay
13%14%6%9%9%46%5%46%24%
2354
April1st to 10thDay
17%15%8%10%8%44445%21%
2160
11th to 20thDay
17%10%5%10%6%46%5%5%6%27%
2156
21st to endDay
17%13%5%10%6%35%446%27%
2470
May1st to 10thDay
17%11%5%8%7%44447%29%
2520
11th to 20thDay
18%8%37%7%45%5%5%6%32%
2478
21st to endDay
19%9%36%6%46%5%5%7%29%
2756
June1st to 10thDay
22%9%47%7%35%45%7%28%
2700
11th to 20thDay
17%7%47%7%46%5%7%7%30%
2874
21st to endDay
19%7%37%7%47%5%6%7%28%
2880
July1st to 10thDay
18%8%46%6%5%6%6%6%8%27%
2767
11th to 20thDay
17%9%37%7%46%6%7%8%28%
2530
21st to endDay
19%9%37%7%5%6%6%6%8%24%
2744
August1st to 10thDay
21%10%5%8%8%5%7%5%5%7%19%
2506
11th to 20thDay
20%9%48%7%45%5%6%7%25%
2481
21st to endDay
20%9%47%6%45%6%5%7%27%
2387
September1st to 10thDay
22%10%38%6%35%446%28%
2160
11th to 20thDay
22%12%38%6%45%5%5%7%23%
2119
21st to endDay
25%13%37%6%34435%27%
1976
October1st to 10thDay
24%12%6%7%6%34436%26%
1800
11th to 20thDay
31%20%6%9%6%3443212%
1724
21st to endDay
28%18%7%11%7%44225%12%
1782
November1st to 10thDay
22%24%8%12%7%3333312%
1595
11th to 20thDay
22%22%9%13%9%433239%
1520
21st to endDay
20%24%10%14%9%45%3335%
1387
December1st to 10thDay
16%22%9%15%9%6%6%5%338%
1330
11th to 20thDay
17%15%6%14%10%5%7%5%5%412%
1668
21st to endDay
13%17%10%16%12%6%7%5%447%
2476
January1st to 10thNight
14%20%10%16%10%5%6%5%5%46%
2649
11th to 20thNight
12%15%7%13%8%5%7%7%7%7%11%
2535
21st to endNight
8%12%7%13%11%6%9%9%8%6%11%
2772
February1st to 10thNight
8%11%6%10%10%7%12%9%8%6%13%
2475
11th to 20thNight
10%18%7%12%10%6%8%8%5%6%12%
2273
21st to endNight
7%14%6%12%11%6%6%8%6%6%18%
1788
March1st to 10thNight
9%14%7%10%9%5%6%5%6%7%22%
2150
11th to 20thNight
13%14%7%11%10%5%7%6%4420%
2071
21st to endNight
14%15%6%10%6%46%445%25%
2001
April1st to 10thNight
19%14%6%9%8%45%445%23%
1800
11th to 20thNight
13%12%5%8%7%45%5%46%30%
1751
21st to endNight
18%10%5%8%7%3444433%
1506
May1st to 10thNight
18%11%37%7%3445%5%32%
1440
11th to 20thNight
16%10%5%7%6%35%5%5%5%33%
1415
21st to endNight
22%10%37%5%35%447%31%
1514
June1st to 10thNight
22%9%37%6%345%5%6%30%
1260
11th to 20thNight
18%7%48%5%46%6%6%7%31%
1080
21st to endNight
17%6%26%5%45%5%6%6%38%
1080
July1st to 10thNight
21%6%37%5%345%6%8%32%
1189
11th to 20thNight
15%6%35%6%45%5%6%8%37%
1428
21st to endNight
18%8%37%6%35%5%6%7%30%
1574
August1st to 10thNight
21%8%35%6%35%6%6%8%29%
1432
11th to 20thNight
16%9%46%7%445%6%8%31%
1420
21st to endNight
20%9%48%6%45%5%5%6%30%
1947
September1st to 10thNight
22%8%36%6%34346%34%
1800
11th to 20thNight
23%11%37%6%3445%6%28%
1840
21st to endNight
21%11%48%6%34445%31%
1981
October1st to 10thNight
21%11%46%5%35%5%5%6%29%
2160
11th to 20thNight
28%17%6%9%6%3444415%
2236
21st to endNight
29%18%6%9%6%3434414%
2574
November1st to 10thNight
25%21%7%12%7%4433310%
2483
11th to 20thNight
19%20%8%13%10%46%44310%
2660
21st to endNight
18%23%10%15%11%5%5%4236%
2791
December1st to 10thNight
16%21%8%16%11%46%4337%
2850
11th to 20thNight
16%17%7%11%11%7%7%6%5%410%
3531
21st to endNight
13%15%8%19%13%6%6%4439%
5172

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%47%10%2
1518
11th to 20thDay
71%5%6%12%5%1
1448
21st to endDay
68%36%13%10%
1584
February1st to 10thDay
68%5%5%13%9%
1483
11th to 20thDay
72%5%7%9%6%
1582
21st to endDay
66%5%8%13%8%
1467
March1st to 10thDay
62%5%9%13%11%1
1800
11th to 20thDay
64%5%7%13%9%1
1885
21st to endDay
62%5%9%14%10%1
2354
April1st to 10thDay
66%5%9%12%7%1
2160
11th to 20thDay
57%6%10%16%10%1
2156
21st to endDay
58%7%7%15%13%1
2470
May1st to 10thDay
55%6%8%19%11%1
2520
11th to 20thDay
52%6%10%19%11%2
2482
21st to endDay
53%7%11%19%10%1
2756
June1st to 10thDay
55%6%8%19%11%
2700
11th to 20thDay
51%8%10%17%12%2
2874
21st to endDay
53%9%10%18%10%
2880
July1st to 10thDay
52%9%14%19%5%
2693
11th to 20thDay
51%8%15%20%6%
2454
21st to endDay
56%10%15%15%4
2591
August1st to 10thDay
63%9%14%13%1
2492
11th to 20thDay
56%10%15%14%5%
2481
21st to endDay
55%8%12%21%4
2387
September1st to 10thDay
56%6%13%16%8%
2160
11th to 20thDay
59%8%12%16%4
2119
21st to endDay
60%6%12%18%4
1976
October1st to 10thDay
61%6%11%14%7%1
1800
11th to 20thDay
79%5%7%7%11
1724
21st to endDay
77%5%8%7%31
1782
November1st to 10thDay
79%5%8%7%21
1595
11th to 20thDay
83%46%5%1
1520
21st to endDay
88%36%3
1387
December1st to 10thDay
84%348%1
1330
11th to 20thDay
75%5%5%11%41
1668
21st to endDay
80%5%5%5%41
2476
January1st to 10thNight
81%36%8%2
2649
11th to 20thNight
69%5%6%13%6%1
2535
21st to endNight
67%6%7%13%6%
2772
February1st to 10thNight
65%6%8%12%8%
2475
11th to 20thNight
72%6%7%11%4
2275
21st to endNight
64%6%7%16%7%
1788
March1st to 10thNight
61%5%8%15%10%1
2160
11th to 20thNight
67%5%5%13%9%1
2072
21st to endNight
62%5%8%16%9%1
2001
April1st to 10thNight
63%6%9%13%8%2
1800
11th to 20thNight
54%6%9%21%9%1
1751
21st to endNight
55%5%9%17%13%2
1506
May1st to 10thNight
54%5%10%16%12%3
1440
11th to 20thNight
51%6%10%17%13%1
1416
21st to endNight
54%5%7%19%15%1
1515
June1st to 10thNight
53%5%10%18%12%1
1260
11th to 20thNight
49%9%9%19%13%2
1080
21st to endNight
45%8%13%24%9%
1080
July1st to 10thNight
49%7%15%22%7%
1154
11th to 20thNight
42%8%16%26%8%
1381
21st to endNight
54%8%13%22%2
1486
August1st to 10thNight
51%11%20%17%1
1422
11th to 20thNight
49%9%19%17%6%
1420
21st to endNight
54%8%15%20%3
1947
September1st to 10thNight
54%5%11%21%9%
1800
11th to 20thNight
55%8%15%17%5%
1840
21st to endNight
56%5%14%20%5%
1981
October1st to 10thNight
56%8%13%16%7%1
2160
11th to 20thNight
74%5%8%11%21
2236
21st to endNight
76%5%7%8%41
2574
November1st to 10thNight
79%5%5%7%3
2483
11th to 20thNight
81%48%6%1
2660
21st to endNight
87%36%4
2791
December1st to 10thNight
83%46%7%1
2850
11th to 20thNight
76%5%7%10%3
3532
21st to endNight
79%47%6%31
5172

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
14%16%39%27%31
180
11th to 20thDay
20%12%31%19%15%3
162
21st to endDay
16%10%30%28%13%2
176
February1st to 10thDay
7%18%41%28%5%1
180
11th to 20thDay
19%13%40%21%6%1
240
21st to endDay
17%14%40%21%8%1
333
March1st to 10thDay
16%14%31%27%11%1
420
11th to 20thDay
20%15%35%21%8%1
420
21st to endDay
24%13%30%26%5%2
462
April1st to 10thDay
23%15%31%20%10%2
420
11th to 20thDay
21%17%27%26%6%4
412
21st to endDay
22%14%36%19%7%2
420
May1st to 10thDay
23%13%33%21%9%2
423
11th to 20thDay
23%12%26%24%12%3
447
21st to endDay
22%14%32%23%8%
516
June1st to 10thDay
27%10%29%23%8%2
630
11th to 20thDay
21%13%30%23%11%2
804
21st to endDay
21%8%27%29%13%2
810
July1st to 10thDay
22%10%28%26%11%2
688
11th to 20thDay
22%9%24%28%14%3
453
21st to endDay
23%7%26%23%15%6%
488
August1st to 10thDay
24%11%23%23%14%4
446
11th to 20thDay
23%9%23%25%14%7%
439
21st to endDay
24%10%26%21%11%7%
495
September1st to 10thDay
28%11%28%20%10%3
450
11th to 20thDay
24%14%30%22%8%2
450
21st to endDay
30%12%26%18%10%3
450
October1st to 10thDay
28%14%26%19%10%2
450
11th to 20thDay
36%17%22%16%6%2
412
21st to endDay
34%15%28%17%6%1
396
November1st to 10thDay
38%16%32%11%2
289
11th to 20thDay
33%18%28%14%7%
180
21st to endDay
37%13%32%12%5%1
180
December1st to 10thDay
26%12%23%21%16%3
180
11th to 20thDay
24%22%27%14%11%2
180
21st to endDay
20%15%34%22%7%3
198
January1st to 10thNight
21%11%33%26%9%1
760
11th to 20thNight
20%14%33%23%9%1
725
21st to endNight
15%8%30%33%14%1
792
February1st to 10thNight
12%11%33%33%10%2
720
11th to 20thNight
20%12%30%28%9%1
703
21st to endNight
16%12%33%26%12%1
592
March1st to 10thNight
16%12%30%31%9%2
720
11th to 20thNight
20%13%32%27%7%1
720
21st to endNight
21%11%34%26%7%1
792
April1st to 10thNight
25%11%30%25%9%
720
11th to 20thNight
19%12%32%27%11%
687
21st to endNight
24%6%34%27%9%1
426
May1st to 10thNight
27%431%28%10%1
360
11th to 20thNight
20%8%34%25%11%2
354
21st to endNight
26%9%29%28%7%
389
June1st to 10thNight
25%7%30%28%10%
360
11th to 20thNight
20%7%30%31%11%
360
21st to endNight
20%7%24%35%13%1
360
July1st to 10thNight
25%6%27%31%9%1
350
11th to 20thNight
18%326%36%15%1
348
21st to endNight
24%5%18%36%17%1
394
August1st to 10thNight
24%422%27%22%2
358
11th to 20thNight
20%6%21%30%21%2
356
21st to endNight
24%8%22%26%15%3
759
September1st to 10thNight
28%6%25%27%14%1
720
11th to 20thNight
29%10%25%26%8%2
720
21st to endNight
27%10%28%25%10%1
720
October1st to 10thNight
25%12%30%23%8%1
720
11th to 20thNight
37%10%26%20%5%2
720
21st to endNight
39%10%25%19%7%1
792
November1st to 10thNight
36%16%25%16%6%1
740
11th to 20thNight
28%15%32%18%6%
760
21st to endNight
28%17%30%18%6%1
823
December1st to 10thNight
25%11%32%22%9%1
850
11th to 20thNight
22%13%32%21%9%2
850
21st to endNight
24%13%31%23%8%1
917
Page generated at 2024-01-08 22:31:24. Version ac07

Copyright 2024 Attilla Danko


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