Chicoutimi
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Chicoutimi clear sky chart from 2005-11-05 to 2018-02-14.

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%
15188
8%
48858
5%
15157
28%
15157
10%
38695

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
15%
793
6%
2774
4%
789
18%
789
4%
2409
January16th to endNight
19%
832
7%
2912
4%
832
23%
832
7%
2397
February1st to 15thNight
21%
759
8%
2601
5%
757
26%
757
9%
2066
February16th to endNight
18%
631
8%
1893
3%
631
24%
631
9%
1556
March1st to 15thNight
23%
720
12%
2159
9%
720
28%
720
13%
1661
March16th to endNight
24%
768
15%
2025
6%
768
30%
768
16%
1541
April1st to 15thNight
24%
697
12%
1775
5%
697
28%
697
14%
1413
April16th to endNight
25%
540
15%
1620
7%
540
33%
540
18%
1145
May1st to 15thNight
27%
421
11%
1501
10%
421
33%
421
13%
1088
May16th to endNight
29%
375
10%
1380
9%
374
35%
374
12%
1004
June1st to 15thNight
32%
360
4%
1260
2%
360
35%
360
14%
907
June16th to endNight
36%
360
4%
1260
3%
360
37%
360
14%
913
July1st to 15thNight
33%
340
6%
1227
4%
340
36%
340
14%
869
July16th to endNight
39%
376
6%
1418
10%
354
40%
354
11%
1035
August1st to 15thNight
40%
390
9%
1461
8%
388
44%
388
12%
1076
August16th to endNight
35%
612
10%
1758
5%
612
38%
612
16%
1338
September1st to 15thNight
35%
720
8%
1845
4%
720
37%
720
20%
1387
September16th to endNight
30%
717
13%
1980
8%
717
33%
717
18%
1469
October1st to 15thNight
26%
720
12%
2106
6%
720
32%
720
15%
1600
October16th to endNight
19%
768
7%
2496
5%
768
22%
768
7%
2090
November1st to 15thNight
20%
760
9%
2472
7%
760
24%
760
8%
2018
November16th to endNight
19%
824
5%
2890
4%
824
22%
824
6%
2424
December1st to 15thNight
13%
825
2%
2925
0%
825
15%
825
4%
2576
December16th to endNight
16%
880
6%
3120
3%
880
19%
880
4%
2713

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%
49226
Night
19%12%5%8%7%35%445%23%
49021
TransparencyDay
60%6%11%14%5%
48907
Night
63%6%10%14%5%
48858
SeeingDay
27%13%27%19%9%1
6582
Night
26%12%27%24%8%
15189

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
15%14%8%11%8%5%6%46%413%
1491
16th to endDay
12%14%6%10%8%46%9%5%5%16%
1664
February1st to 15thDay
7%11%7%9%10%6%8%6%5%5%18%
1559
16th to endDay
11%15%6%9%9%5%8%5%45%18%
1580
March1st to 15thDay
17%10%48%6%35%6%5%6%25%
1790
16th to endDay
15%12%48%5%35%5%46%29%
2198
April1st to 15thDay
21%10%46%6%34445%28%
2173
16th to endDay
20%8%35%5%24346%33%
2340
May1st to 15thDay
22%8%35%434445%33%
2460
16th to endDay
22%6%36%435%5%6%6%29%
2734
June1st to 15thDay
20%7%26%5%35%5%5%6%29%
2700
16th to endDay
20%6%37%7%45%5%5%7%26%
2700
July1st to 15thDay
21%6%26%6%45%6%6%7%24%
2658
16th to endDay
18%6%37%6%35%5%6%6%29%
2654
August1st to 15thDay
20%8%37%7%36%6%5%6%22%
2475
16th to endDay
19%7%37%5%345%5%8%28%
2442
September1st to 15thDay
24%6%26%5%34446%30%
2115
16th to endDay
21%7%36%5%2445%5%33%
1980
October1st to 15thDay
24%9%36%6%34345%27%
1851
16th to endDay
29%16%47%5%3444416%
1728
November1st to 15thDay
23%12%5%7%6%35%446%20%
1716
16th to endDay
23%18%5%10%5%2444416%
1397
December1st to 15thDay
23%18%5%10%7%36%43412%
1365
16th to endDay
19%18%6%9%8%46%43413%
1456
January1st to 15thNight
18%16%7%11%10%46%5%4411%
2774
16th to endNight
11%15%7%8%10%47%6%6%5%14%
2912
February1st to 15thNight
8%11%7%11%10%6%7%5%6%421%
2600
16th to endNight
12%18%7%11%8%4434420%
1893
March1st to 15thNight
17%13%5%7%5%35%445%26%
2146
16th to endNight
13%13%6%7%5%34335%32%
2025
April1st to 15thNight
24%12%47%5%2443426%
1775
16th to endNight
21%8%26%324446%35%
1620
May1st to 15thNight
23%9%46%5%23345%29%
1501
16th to endNight
22%8%36%5%34445%28%
1378
June1st to 15thNight
21%8%45%5%35%5%47%28%
1260
16th to endNight
19%5%36%6%45%5%49%27%
1260
July1st to 15thNight
18%6%37%6%45%6%6%8%26%
1300
16th to endNight
17%7%35%7%46%47%7%28%
1514
August1st to 15thNight
18%7%47%7%45%5%5%7%27%
1471
16th to endNight
21%6%26%6%36%6%5%6%28%
1758
September1st to 15thNight
22%6%36%5%3335%5%33%
1845
16th to endNight
23%5%25%6%3444435%
1980
October1st to 15thNight
24%7%25%6%33436%30%
2106
16th to endNight
31%15%36%5%3334418%
2496
November1st to 15thNight
24%16%5%7%6%3334420%
2472
16th to endNight
22%16%5%11%5%2434417%
2890
December1st to 15thNight
23%18%6%11%7%35%43411%
2925
16th to endNight
15%19%7%10%10%46%5%4411%
3120

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
71%7%9%8%2
1492
16th to endDay
65%7%7%14%4
1664
February1st to 15thDay
65%8%9%10%31
1562
16th to endDay
68%5%7%12%5%
1580
March1st to 15thDay
60%5%9%14%8%
1800
16th to endDay
56%5%11%18%8%
2198
April1st to 15thDay
59%49%16%8%1
2173
16th to endDay
52%5%11%18%11%1
2340
May1st to 15thDay
53%412%17%11%1
2460
16th to endDay
55%7%8%18%8%1
2738
June1st to 15thDay
54%5%11%16%10%1
2700
16th to endDay
55%8%11%16%7%
2700
July1st to 15thDay
55%8%15%16%3
2502
16th to endDay
56%8%13%17%4
2487
August1st to 15thDay
59%9%16%11%2
2461
16th to endDay
53%8%17%16%2
2442
September1st to 15thDay
55%5%14%18%5%
2115
16th to endDay
51%6%16%18%5%
1980
October1st to 15thDay
60%5%11%14%6%
1851
16th to endDay
72%6%9%9%1
1728
November1st to 15thDay
66%6%10%12%3
1716
16th to endDay
72%7%10%8%1
1397
December1st to 15thDay
75%5%9%7%1
1365
16th to endDay
75%5%6%7%4
1456
January1st to 15thNight
76%6%6%7%3
2774
16th to endNight
68%7%8%13%3
2912
February1st to 15thNight
63%7%9%13%4
2601
16th to endNight
68%48%13%4
1893
March1st to 15thNight
60%48%16%8%
2159
16th to endNight
56%5%7%20%8%1
2025
April1st to 15thNight
62%47%13%10%1
1775
16th to endNight
51%410%19%13%1
1620
May1st to 15thNight
58%38%16%11%
1501
16th to endNight
56%5%9%16%9%1
1380
June1st to 15thNight
54%6%12%16%9%
1260
16th to endNight
53%7%11%16%8%1
1260
July1st to 15thNight
52%7%15%18%4
1227
16th to endNight
54%10%10%19%5%
1418
August1st to 15thNight
54%9%16%16%3
1461
16th to endNight
54%9%14%18%3
1758
September1st to 15thNight
52%6%14%18%7%
1845
16th to endNight
52%7%13%21%5%
1980
October1st to 15thNight
56%6%11%17%6%1
2106
16th to endNight
70%5%8%11%3
2496
November1st to 15thNight
68%5%10%11%4
2472
16th to endNight
70%6%10%8%2
2890
December1st to 15thNight
77%6%8%6%1
2925
16th to endNight
75%6%6%8%2
3120

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
23%21%36%16%2
90
16th to endDay
25%17%32%20%4
96
February1st to 15thDay
17%14%41%17%6%2
128
16th to endDay
28%16%27%19%7%
239
March1st to 15thDay
30%15%26%18%9%
270
16th to endDay
23%16%28%22%8%1
288
April1st to 15thDay
27%15%26%20%8%1
270
16th to endDay
26%15%30%15%10%1
270
May1st to 15thDay
28%12%28%20%8%1
288
16th to endDay
26%15%31%18%7%
447
June1st to 15thDay
26%10%26%23%10%1
495
16th to endDay
23%9%31%21%11%2
495
July1st to 15thDay
27%8%26%23%13%1
436
16th to endDay
21%9%27%25%12%2
326
August1st to 15thDay
25%8%25%22%14%4
313
16th to endDay
24%13%21%22%11%5%
332
September1st to 15thDay
28%11%25%18%10%4
315
16th to endDay
24%14%25%20%11%3
314
October1st to 15thDay
30%14%25%18%10%1
300
16th to endDay
43%13%22%12%6%1
288
November1st to 15thDay
33%17%23%16%7%1
280
16th to endDay
44%17%24%12%1
116
December1st to 15thDay
30%17%41%5%41
90
16th to endDay
28%30%27%11%3
96
January1st to 15thNight
26%13%30%22%6%
793
16th to endNight
20%14%30%26%7%1
832
February1st to 15thNight
14%13%36%26%7%
760
16th to endNight
24%15%31%19%8%1
631
March1st to 15thNight
26%15%29%22%6%
720
16th to endNight
21%15%29%24%7%
768
April1st to 15thNight
30%14%25%22%6%
697
16th to endNight
24%11%32%22%7%
540
May1st to 15thNight
29%10%26%24%8%
421
16th to endNight
25%11%28%27%7%
375
June1st to 15thNight
22%6%31%30%7%
360
16th to endNight
19%8%29%32%9%
360
July1st to 15thNight
21%8%26%31%10%
340
16th to endNight
18%6%26%35%13%
376
August1st to 15thNight
20%7%20%32%18%1
390
16th to endNight
23%6%25%29%13%1
612
September1st to 15thNight
27%7%22%29%10%1
720
16th to endNight
26%9%29%23%9%1
717
October1st to 15thNight
27%12%27%22%10%
720
16th to endNight
38%15%20%17%7%
768
November1st to 15thNight
33%16%21%19%8%
760
16th to endNight
29%17%25%19%6%1
824
December1st to 15thNight
33%15%25%18%5%
825
16th to endNight
26%17%24%22%7%1
880
Page generated at 2018-02-15 10:58:38. Version ac04

Copyright 2018 A. Danko


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