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 2005-11-05 to 2017-12-01.

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
24%
14862
8%
47782
5%
14831
27%
14831
10%
37931

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 15thNight
14%
729
6%
2559
3%
725
17%
725
4%
2220
January16th to endNight
19%
768
6%
2688
3%
768
23%
768
6%
2212
February1st to 15thNight
20%
703
8%
2406
5%
701
25%
701
9%
1924
February16th to endNight
15%
631
7%
1893
3%
631
21%
631
9%
1562
March1st to 15thNight
22%
720
12%
2157
9%
720
27%
720
12%
1671
March16th to endNight
24%
768
14%
2028
6%
768
29%
768
15%
1557
April1st to 15thNight
23%
697
12%
1775
5%
697
26%
697
14%
1413
April16th to endNight
26%
540
15%
1620
7%
540
33%
540
18%
1155
May1st to 15thNight
27%
426
10%
1506
9%
426
32%
426
13%
1098
May16th to endNight
28%
375
9%
1381
9%
374
33%
374
12%
1011
June1st to 15thNight
32%
360
4%
1260
2%
360
34%
360
13%
911
June16th to endNight
36%
360
4%
1260
3%
360
37%
360
14%
918
July1st to 15thNight
35%
340
5%
1229
4%
340
38%
340
13%
883
July16th to endNight
38%
376
6%
1418
8%
354
40%
354
11%
1041
August1st to 15thNight
41%
395
8%
1466
8%
393
43%
393
12%
1087
August16th to endNight
35%
611
9%
1757
5%
611
38%
611
15%
1342
September1st to 15thNight
34%
720
8%
1848
4%
720
36%
720
19%
1387
September16th to endNight
30%
717
13%
1980
8%
717
34%
717
18%
1469
October1st to 15thNight
25%
720
11%
2104
6%
720
31%
720
15%
1596
October16th to endNight
18%
768
6%
2496
4%
768
21%
768
7%
2094
November1st to 15thNight
20%
760
9%
2472
7%
760
23%
760
7%
2022
November16th to endNight
18%
824
5%
2887
3%
824
21%
824
6%
2422
December1st to 15thNight
12%
754
2%
2712
0%
754
13%
754
4%
2396
December16th to endNight
14%
800
5%
2880
3%
800
17%
800
4%
2540

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
20%10%47%6%35%5%5%6%25%
48659
Night
19%12%5%8%7%45%445%22%
47945
TransparencyDay
60%7%12%14%5%
48340
Night
63%6%10%13%5%
47782
SeeingDay
28%13%27%20%8%1
6433
Night
26%13%28%23%7%
14863

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 15thDay
14%14%7%10%10%6%7%5%5%413%
1376
16th to endDay
10%14%7%9%9%5%8%9%7%414%
1536
February1st to 15thDay
7%12%6%11%9%7%9%7%5%5%16%
1453
16th to endDay
10%17%7%9%9%5%7%5%4418%
1580
March1st to 15thDay
17%11%48%6%5%6%5%45%24%
1793
16th to endDay
14%13%5%7%5%34445%29%
2196
April1st to 15thDay
20%13%46%6%34445%27%
2173
16th to endDay
22%8%35%5%24346%33%
2340
May1st to 15thDay
23%7%345%33336%33%
2455
16th to endDay
22%7%35%5%36%46%5%29%
2732
June1st to 15thDay
21%7%26%5%35%45%6%29%
2700
16th to endDay
20%7%37%6%35%6%5%6%26%
2700
July1st to 15thDay
22%6%47%5%45%6%5%8%24%
2656
16th to endDay
19%6%36%7%45%5%5%6%29%
2654
August1st to 15thDay
21%7%38%6%46%5%6%7%22%
2472
16th to endDay
20%8%36%5%35%5%5%7%27%
2444
September1st to 15thDay
25%7%25%434445%31%
2112
16th to endDay
21%7%25%4345%46%33%
1980
October1st to 15thDay
24%10%27%6%35%346%25%
1854
16th to endDay
29%16%47%6%2433416%
1728
November1st to 15thDay
20%15%5%9%6%345%4420%
1716
16th to endDay
24%16%7%7%7%335%4416%
1403
December1st to 15thDay
21%18%5%9%9%46%5%45%10%
1262
16th to endDay
20%18%7%9%7%46%5%3312%
1344
January1st to 15thNight
16%15%7%13%10%5%6%44410%
2559
16th to endNight
11%15%7%10%9%5%8%7%6%412%
2688
February1st to 15thNight
7%12%6%11%10%6%9%6%5%418%
2405
16th to endNight
13%19%7%12%7%4433319%
1893
March1st to 15thNight
16%14%5%9%5%35%445%24%
2144
16th to endNight
14%14%5%8%5%3343431%
2028
April1st to 15thNight
24%13%5%6%5%2334425%
1775
16th to endNight
22%9%24424346%35%
1620
May1st to 15thNight
25%8%36%5%24445%29%
1506
16th to endNight
22%9%46%5%34446%28%
1379
June1st to 15thNight
20%8%36%5%35%5%45%29%
1260
16th to endNight
19%6%36%6%46%5%6%7%27%
1260
July1st to 15thNight
18%7%35%6%35%7%7%8%27%
1302
16th to endNight
17%6%35%7%46%6%7%7%27%
1514
August1st to 15thNight
19%6%27%6%45%5%6%6%28%
1476
16th to endNight
20%6%36%5%45%5%6%6%28%
1757
September1st to 15thNight
22%6%26%6%25%45%5%33%
1848
16th to endNight
24%6%34444335%35%
1980
October1st to 15thNight
23%9%36%5%33346%29%
2104
16th to endNight
31%13%46%5%3344417%
2496
November1st to 15thNight
23%16%6%7%6%3434420%
2472
16th to endNight
21%16%5%10%7%35%33416%
2887
December1st to 15thNight
22%17%6%11%8%45%4349%
2712
16th to endNight
16%19%8%11%10%45%5%4310%
2880

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 15thDay
72%7%10%7%2
1377
16th to endDay
66%6%9%12%4
1536
February1st to 15thDay
66%8%10%9%3
1456
16th to endDay
68%6%7%12%5%
1580
March1st to 15thDay
61%5%10%13%8%
1803
16th to endDay
57%5%10%18%7%
2196
April1st to 15thDay
59%5%9%16%7%1
2173
16th to endDay
52%6%12%17%10%
2340
May1st to 15thDay
53%5%12%17%10%1
2455
16th to endDay
55%8%9%17%8%1
2736
June1st to 15thDay
54%7%11%15%9%1
2700
16th to endDay
55%9%12%16%6%
2700
July1st to 15thDay
56%8%16%15%3
2500
16th to endDay
56%9%13%16%3
2487
August1st to 15thDay
59%10%16%10%2
2458
16th to endDay
54%8%18%15%2
2444
September1st to 15thDay
54%7%14%18%5%
2112
16th to endDay
50%8%16%18%5%
1980
October1st to 15thDay
60%6%12%13%5%
1854
16th to endDay
73%5%9%9%1
1728
November1st to 15thDay
66%7%11%11%2
1716
16th to endDay
72%7%10%8%
1403
December1st to 15thDay
77%5%9%7%
1262
16th to endDay
75%6%7%6%3
1344
January1st to 15thNight
76%5%7%8%1
2559
16th to endNight
68%7%9%12%2
2688
February1st to 15thNight
64%7%9%14%3
2406
16th to endNight
69%49%13%3
1893
March1st to 15thNight
61%5%9%15%8%
2157
16th to endNight
57%5%8%19%7%1
2028
April1st to 15thNight
62%46%14%9%1
1775
16th to endNight
50%6%9%19%12%1
1620
May1st to 15thNight
57%5%9%15%10%
1506
16th to endNight
57%5%10%15%8%1
1381
June1st to 15thNight
54%6%12%16%7%
1260
16th to endNight
53%8%12%16%8%
1260
July1st to 15thNight
51%9%16%17%4
1229
16th to endNight
53%11%12%17%5%
1418
August1st to 15thNight
53%10%16%15%3
1466
16th to endNight
53%10%15%17%3
1757
September1st to 15thNight
52%7%15%17%7%
1848
16th to endNight
52%7%13%20%5%
1980
October1st to 15thNight
56%6%12%17%6%1
2104
16th to endNight
70%6%9%10%3
2496
November1st to 15thNight
67%5%10%11%3
2472
16th to endNight
71%6%11%8%2
2887
December1st to 15thNight
77%6%9%5%
2712
16th to endNight
77%6%6%7%1
2880

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 15thDay
21%26%38%11%1
60
16th to endDay
28%17%28%21%4
64
February1st to 15thDay
23%9%35%19%7%2
101
16th to endDay
29%15%27%17%8%
239
March1st to 15thDay
29%16%27%18%7%
270
16th to endDay
25%16%27%21%9%1
288
April1st to 15thDay
31%14%25%21%6%1
270
16th to endDay
28%16%30%14%8%1
270
May1st to 15thDay
29%12%29%19%7%1
288
16th to endDay
26%15%31%18%6%1
445
June1st to 15thDay
27%10%25%25%9%1
495
16th to endDay
21%12%30%22%10%2
495
July1st to 15thDay
27%10%25%24%11%1
434
16th to endDay
23%9%28%25%11%1
326
August1st to 15thDay
26%10%22%23%11%5%
313
16th to endDay
25%12%24%21%10%5%
332
September1st to 15thDay
28%11%26%19%9%4
315
16th to endDay
23%15%26%19%10%3
314
October1st to 15thDay
29%15%25%19%8%1
300
16th to endDay
44%13%22%11%5%1
288
November1st to 15thDay
33%19%22%16%6%
280
16th to endDay
39%21%23%13%1
122
December1st to 15thDay
31%15%38%10%5%
60
16th to endDay
35%29%28%41
64
January1st to 15thNight
25%15%32%20%5%
729
16th to endNight
19%15%31%25%6%1
768
February1st to 15thNight
13%15%37%25%7%
704
16th to endNight
25%15%31%19%7%
631
March1st to 15thNight
26%17%29%21%5%
720
16th to endNight
21%16%30%23%7%
768
April1st to 15thNight
31%14%25%22%4
697
16th to endNight
25%13%32%21%7%
540
May1st to 15thNight
29%11%27%24%6%
426
16th to endNight
26%12%26%26%8%
375
June1st to 15thNight
21%8%30%31%7%1
360
16th to endNight
17%8%31%31%9%1
360
July1st to 15thNight
21%7%27%31%10%
340
16th to endNight
21%427%33%13%
376
August1st to 15thNight
21%6%22%32%16%1
395
16th to endNight
24%7%26%29%11%1
611
September1st to 15thNight
27%9%24%28%9%1
720
16th to endNight
27%9%29%22%9%1
717
October1st to 15thNight
26%12%27%22%9%
720
16th to endNight
40%15%20%16%6%
768
November1st to 15thNight
32%17%22%18%7%1
760
16th to endNight
29%18%26%18%6%
824
December1st to 15thNight
32%18%27%16%5%
754
16th to endNight
26%18%25%21%6%1
800
Page generated at 2017-12-02 09:14:25. Version ac04

Copyright 2017 A. Danko


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