Saguenay-Bagotville Airport (YBG)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saguenay-Bagotville Airport (YBG) clear sky chart from 2005-11-06 to 2024-01-16.

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
23%
22717
8%
74984
5%
22671
27%
22671
10%
59236

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
12%
801
5%
2734
2%
798
16%
798
4%
2411
January11th to 20thNight
16%
744
7%
2602
4%
744
19%
744
5%
2167
January21st to endNight
20%
792
8%
2772
5%
792
25%
792
8%
2205
February1st to 10thNight
17%
720
9%
2520
5%
720
23%
720
9%
1989
February11th to 20thNight
15%
702
7%
2184
3%
700
21%
700
7%
1812
February21st to endNight
17%
592
10%
1776
4%
592
24%
592
12%
1385
March1st to 10thNight
19%
720
10%
2160
7%
720
25%
720
11%
1712
March11th to 20thNight
20%
720
11%
2066
7%
720
25%
720
11%
1649
March21st to endNight
21%
792
13%
2052
4%
792
26%
792
14%
1612
April1st to 10thNight
20%
720
10%
1800
3%
720
24%
720
13%
1474
April11th to 20thNight
23%
592
14%
1656
7%
592
28%
592
17%
1227
April21st to endNight
25%
540
15%
1620
6%
540
33%
540
16%
1172
May1st to 10thNight
25%
460
11%
1540
8%
460
31%
460
13%
1139
May11th to 20thNight
31%
354
15%
1416
14%
354
42%
354
15%
954
May21st to endNight
24%
389
9%
1381
6%
388
32%
388
14%
987
June1st to 10thNight
28%
360
5%
1260
3%
360
31%
360
13%
912
June11th to 20thNight
38%
360
7%
1260
4%
360
42%
360
18%
844
June21st to endNight
33%
360
5%
1260
3%
360
35%
360
13%
920
July1st to 10thNight
32%
350
6%
1225
3%
350
37%
350
15%
870
July11th to 20thNight
41%
348
6%
1366
9%
348
43%
348
13%
945
July21st to endNight
37%
394
6%
1486
9%
372
38%
372
11%
1108
August1st to 10thNight
43%
358
9%
1422
10%
356
46%
356
13%
1012
August11th to 20thNight
38%
497
9%
1561
7%
497
40%
497
14%
1169
August21st to endNight
36%
650
11%
1838
7%
650
38%
650
17%
1374
September1st to 10thNight
34%
720
11%
1800
4%
720
37%
720
21%
1335
September11th to 20thNight
30%
720
9%
1961
4%
720
33%
720
18%
1463
September21st to endNight
32%
720
14%
1980
9%
720
36%
720
18%
1466
October1st to 10thNight
28%
720
16%
1985
8%
720
36%
720
18%
1459
October11th to 20thNight
20%
720
6%
2340
4%
720
23%
720
8%
1934
October21st to endNight
18%
792
7%
2574
4%
792
23%
792
8%
2091
November1st to 10thNight
17%
740
8%
2407
4%
740
22%
740
8%
1950
November11th to 20thNight
18%
800
7%
2602
5%
800
21%
800
7%
2167
November21st to endNight
14%
850
3%
2850
2%
850
16%
850
5%
2496
December1st to 10thNight
14%
850
3%
2850
1%
850
16%
850
4%
2521
December11th to 20thNight
15%
850
5%
3495
3%
848
17%
848
4%
3014
December21st to endNight
13%
920
4%
5183
3%
906
17%
906
2%
4291

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%11%48%7%45%5%5%6%26%
74575
Night
18%14%5%9%7%45%5%5%5%22%
75237
TransparencyDay
58%8%13%15%6%1
74272
Night
62%7%11%14%5%1
75074
SeeingDay
25%17%29%19%7%1
14297
Night
25%15%29%23%7%1
22733

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%19%8%13%9%5%7%5%5%412%
1427
11th to 20thDay
13%15%8%11%10%5%6%5%6%5%15%
1480
21st to endDay
8%12%6%10%9%5%8%9%8%6%18%
1584
February1st to 10thDay
6%12%7%10%10%8%11%7%7%6%17%
1440
11th to 20thDay
11%16%6%12%10%5%8%5%5%6%16%
1661
21st to endDay
8%13%6%8%9%6%7%8%6%5%23%
1480
March1st to 10thDay
16%12%5%10%7%46%6%6%6%23%
1797
11th to 20thDay
15%14%5%8%9%5%5%445%24%
1894
21st to endDay
17%14%5%9%5%35%5%46%27%
2303
April1st to 10thDay
18%14%5%10%8%35%45%5%23%
2160
11th to 20thDay
19%11%36%6%34447%33%
2253
21st to endDay
21%10%46%5%2446%7%31%
2340
May1st to 10thDay
22%10%45%5%34446%33%
2435
11th to 20thDay
18%7%36%7%45%46%6%35%
2478
21st to endDay
19%7%36%6%45%46%6%33%
2893
June1st to 10thDay
21%7%37%6%46%5%6%7%30%
2700
11th to 20thDay
18%7%36%6%35%6%5%7%33%
2700
21st to endDay
22%7%47%6%45%6%5%7%28%
2700
July1st to 10thDay
21%6%46%5%45%6%6%9%29%
2700
11th to 20thDay
16%6%38%6%47%7%6%8%28%
2545
21st to endDay
16%7%36%8%6%6%6%6%7%29%
2744
August1st to 10thDay
19%7%38%7%5%6%6%8%8%24%
2506
11th to 20thDay
18%7%47%6%45%46%10%29%
2321
21st to endDay
20%8%46%6%35%5%6%7%30%
2516
September1st to 10thDay
20%7%37%6%46%45%6%32%
2160
11th to 20thDay
22%6%26%5%345%5%6%36%
1998
21st to endDay
23%9%35%5%345%47%33%
1980
October1st to 10thDay
21%9%37%6%45%45%7%29%
1972
11th to 20thDay
27%14%48%7%45%5%45%16%
1620
21st to endDay
26%16%48%6%34445%20%
1782
November1st to 10thDay
19%15%6%10%7%45%5%4421%
1671
11th to 20thDay
20%18%7%10%6%345%45%16%
1576
21st to endDay
19%19%7%10%10%445%45%13%
1330
December1st to 10thDay
19%18%7%13%10%5%7%5%448%
1330
11th to 20thDay
19%16%6%11%9%5%5%5%4415%
1668
21st to endDay
19%17%5%9%12%5%6%5%4413%
2431
January1st to 10thNight
13%20%7%15%11%5%7%4449%
2734
11th to 20thNight
14%17%8%12%10%45%7%6%5%13%
2602
21st to endNight
10%13%7%11%10%6%8%7%7%6%16%
2772
February1st to 10thNight
9%12%6%11%10%7%9%7%5%6%19%
2520
11th to 20thNight
12%19%7%13%8%5%6%5%4417%
2182
21st to endNight
11%16%7%12%8%45%45%423%
1776
March1st to 10thNight
14%17%7%11%7%44445%23%
2150
11th to 20thNight
14%16%6%10%7%5%5%5%5%6%22%
2065
21st to endNight
16%16%5%8%6%345%4429%
2052
April1st to 10thNight
22%15%5%8%7%4444423%
1800
11th to 20thNight
22%12%46%43435%6%31%
1656
21st to endNight
21%11%25%5%3445%6%34%
1620
May1st to 10thNight
26%10%35%5%25%445%29%
1540
11th to 20thNight
19%8%36%6%35%446%34%
1415
21st to endNight
23%9%36%5%3445%7%30%
1380
June1st to 10thNight
19%8%47%6%46%7%6%7%28%
1260
11th to 20thNight
18%9%35%5%35%5%5%7%35%
1260
21st to endNight
22%7%37%6%45%6%6%8%27%
1260
July1st to 10thNight
19%8%35%6%45%7%7%7%29%
1260
11th to 20thNight
14%5%36%8%47%8%8%9%28%
1412
21st to endNight
19%8%46%6%5%5%6%7%7%28%
1574
August1st to 10thNight
17%7%27%6%5%6%5%7%7%30%
1432
11th to 20thNight
19%7%38%7%45%6%5%6%30%
1561
21st to endNight
21%6%36%5%45%5%7%7%30%
1838
September1st to 10thNight
21%6%36%6%35%5%5%6%35%
1800
11th to 20thNight
21%7%27%6%45%5%5%5%33%
1961
21st to endNight
22%7%35%5%45%445%35%
1980
October1st to 10thNight
21%8%36%6%3445%6%33%
1985
11th to 20thNight
30%14%47%6%34445%19%
2340
21st to endNight
28%14%47%5%4445%6%20%
2574
November1st to 10thNight
23%16%6%8%6%33445%21%
2407
11th to 20thNight
19%18%6%11%7%45%45%6%17%
2602
21st to endNight
19%20%7%12%9%45%34413%
2850
December1st to 10thNight
21%17%7%12%9%5%6%445%10%
2850
11th to 20thNight
20%16%7%12%10%45%5%5%5%12%
3531
21st to endNight
16%23%7%11%9%45%43316%
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%7%10%7%2
1428
11th to 20thDay
68%6%11%10%4
1480
21st to endDay
61%7%9%15%7%
1584
February1st to 10thDay
65%9%9%11%5%1
1440
11th to 20thDay
69%7%10%11%4
1669
21st to endDay
60%8%11%15%5%1
1480
March1st to 10thDay
62%6%11%12%7%1
1800
11th to 20thDay
63%5%10%14%8%
1894
21st to endDay
59%6%10%18%7%1
2303
April1st to 10thDay
64%6%11%12%6%2
2160
11th to 20thDay
53%5%14%19%9%1
2253
21st to endDay
53%8%12%16%10%1
2340
May1st to 10thDay
51%7%12%16%12%2
2435
11th to 20thDay
49%7%11%21%11%1
2482
21st to endDay
51%8%10%20%11%1
2893
June1st to 10thDay
54%7%11%16%11%1
2700
11th to 20thDay
49%8%12%19%10%1
2700
21st to endDay
54%9%13%16%7%1
2700
July1st to 10thDay
51%9%17%18%5%
2625
11th to 20thDay
52%9%17%17%5%
2468
21st to endDay
53%11%15%18%3
2591
August1st to 10thDay
56%12%17%13%2
2492
11th to 20thDay
50%9%20%16%5%
2321
21st to endDay
52%9%16%19%4
2516
September1st to 10thDay
52%8%14%19%6%
2160
11th to 20thDay
48%8%19%20%6%
1998
21st to endDay
52%8%15%18%6%
1980
October1st to 10thDay
56%7%14%15%7%1
1972
11th to 20thDay
70%8%11%10%1
1620
21st to endDay
69%6%10%11%31
1782
November1st to 10thDay
66%7%12%12%2
1671
11th to 20thDay
70%9%10%9%2
1576
21st to endDay
75%9%11%5%1
1330
December1st to 10thDay
80%5%8%7%
1330
11th to 20thDay
72%6%10%9%3
1668
21st to endDay
69%11%8%8%4
2431
January1st to 10thNight
78%6%8%7%2
2734
11th to 20thNight
70%7%9%10%4
2602
21st to endNight
65%7%10%14%4
2772
February1st to 10thNight
63%7%10%14%5%
2520
11th to 20thNight
69%6%9%12%4
2184
21st to endNight
64%312%15%5%
1776
March1st to 10thNight
64%5%9%15%6%1
2160
11th to 20thNight
63%6%9%15%6%1
2066
21st to endNight
58%6%9%17%8%2
2052
April1st to 10thNight
64%5%8%12%8%2
1800
11th to 20thNight
54%6%9%19%12%
1656
21st to endNight
51%7%9%21%10%2
1620
May1st to 10thNight
57%6%9%14%12%2
1540
11th to 20thNight
50%7%11%19%12%1
1416
21st to endNight
54%6%10%18%11%1
1381
June1st to 10thNight
52%10%11%18%7%2
1260
11th to 20thNight
48%6%13%19%11%3
1260
21st to endNight
53%9%12%17%8%
1260
July1st to 10thNight
51%9%16%19%5%
1225
11th to 20thNight
47%13%17%17%6%1
1366
21st to endNight
53%12%12%17%5%
1486
August1st to 10thNight
48%13%19%18%2
1422
11th to 20thNight
53%10%16%16%5%
1561
21st to endNight
51%11%15%20%4
1838
September1st to 10thNight
48%10%14%20%8%
1800
11th to 20thNight
52%8%16%18%6%
1961
21st to endNight
51%9%12%21%7%
1980
October1st to 10thNight
51%7%13%20%7%1
1985
11th to 20thNight
68%7%11%12%3
2340
21st to endNight
66%7%10%12%41
2574
November1st to 10thNight
66%7%13%11%3
2407
11th to 20thNight
70%7%11%10%3
2602
21st to endNight
76%6%10%6%1
2850
December1st to 10thNight
77%6%10%6%1
2850
11th to 20thNight
75%6%7%9%2
3532
21st to endNight
71%8%9%10%2
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
23%21%35%17%4
180
11th to 20thDay
25%19%28%22%5%1
170
21st to endDay
16%20%32%24%5%2
176
February1st to 10thDay
17%26%46%8%31
160
11th to 20thDay
25%22%34%14%5%
362
21st to endDay
24%22%30%17%6%
346
March1st to 10thDay
28%16%32%18%6%
420
11th to 20thDay
27%22%29%14%6%1
420
21st to endDay
27%20%29%17%6%
462
April1st to 10thDay
31%20%27%18%41
420
11th to 20thDay
30%16%30%17%6%
412
21st to endDay
27%20%32%15%5%1
420
May1st to 10thDay
29%20%28%15%7%
423
11th to 20thDay
21%15%34%21%6%1
447
21st to endDay
27%17%30%18%7%1
653
June1st to 10thDay
25%15%31%22%6%1
630
11th to 20thDay
21%15%29%22%11%1
630
21st to endDay
22%13%29%24%10%2
630
July1st to 10thDay
23%12%29%26%10%
620
11th to 20thDay
20%13%31%25%10%2
467
21st to endDay
18%13%31%26%11%1
488
August1st to 10thDay
23%10%27%27%9%4
446
11th to 20thDay
17%14%26%28%13%3
439
21st to endDay
23%15%26%19%12%5%
495
September1st to 10thDay
24%16%27%19%9%5%
450
11th to 20thDay
24%16%27%22%8%2
450
21st to endDay
26%18%24%18%11%2
450
October1st to 10thDay
23%18%27%19%10%3
450
11th to 20thDay
37%17%24%13%8%2
360
21st to endDay
36%21%23%15%41
396
November1st to 10thDay
37%19%25%14%4
365
11th to 20thDay
30%20%25%20%5%1
322
21st to endDay
34%24%29%11%2
180
December1st to 10thDay
28%16%32%17%7%1
180
11th to 20thDay
27%28%30%9%6%1
180
21st to endDay
26%31%21%17%5%
198
January1st to 10thNight
25%17%33%20%5%
801
11th to 20thNight
24%17%28%24%6%1
744
21st to endNight
17%14%35%27%6%1
792
February1st to 10thNight
14%18%39%23%5%1
720
11th to 20thNight
24%18%29%22%6%
703
21st to endNight
21%17%34%20%7%1
592
March1st to 10thNight
25%14%34%22%4
720
11th to 20thNight
25%18%31%18%9%
720
21st to endNight
23%19%29%23%5%
792
April1st to 10thNight
29%16%29%21%41
720
11th to 20thNight
28%14%29%23%5%
592
21st to endNight
26%15%31%22%5%
540
May1st to 10thNight
32%13%27%23%5%
460
11th to 20thNight
22%10%31%28%8%
354
21st to endNight
28%13%29%23%7%
389
June1st to 10thNight
19%9%35%31%6%1
360
11th to 20thNight
18%12%26%32%12%1
360
21st to endNight
21%9%30%32%7%1
360
July1st to 10thNight
23%9%31%28%9%
350
11th to 20thNight
16%7%25%39%13%
348
21st to endNight
22%7%26%34%11%
394
August1st to 10thNight
18%8%24%37%12%1
358
11th to 20thNight
20%8%24%31%15%1
497
21st to endNight
23%9%25%30%12%1
650
September1st to 10thNight
24%13%25%27%10%1
720
11th to 20thNight
26%9%29%24%10%2
720
21st to endNight
26%12%26%25%10%2
720
October1st to 10thNight
25%13%26%26%10%
720
11th to 20thNight
35%16%23%18%8%1
720
21st to endNight
37%16%23%18%5%1
792
November1st to 10thNight
34%17%24%18%6%1
740
11th to 20thNight
27%21%26%18%6%1
800
21st to endNight
28%21%29%18%41
850
December1st to 10thNight
31%15%27%19%7%1
850
11th to 20thNight
27%19%26%20%7%1
850
21st to endNight
26%20%27%20%6%1
935
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