Salluit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Salluit clear sky chart from 2005-11-05 to 2017-09-18.

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
40%
15094
4%
46520
4%
15065
40%
15065
9%
38812

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
51%
930
10%
3180
9%
925
53%
925
11%
2510
January16th to endNight
55%
992
11%
3157
10%
992
56%
992
12%
2483
February1st to 15thNight
58%
855
10%
2630
9%
855
59%
855
11%
2099
February16th to endNight
56%
631
8%
2128
8%
631
58%
631
13%
1640
March1st to 15thNight
52%
718
8%
2201
7%
718
52%
718
14%
1709
March16th to endNight
50%
768
10%
2004
7%
768
52%
768
15%
1604
April1st to 15thNight
43%
554
6%
1632
6%
554
45%
554
13%
1303
April16th to endNight
39%
360
1%
1406
1%
360
39%
360
8%
1154
May1st to 15thNight
31%
360
0%
1080
0%
360
31%
360
8%
924
May16th to endNight
31%
374
0%
874
0%
374
31%
374
9%
774
June1st to 15thNight
34%
360
0%
720
0%
360
34%
360
19%
597
June16th to endNight
42%
360
0%
720
0%
360
42%
360
24%
575
July1st to 15thNight
49%
340
0%
680
0%
340
49%
340
29%
517
July16th to endNight
46%
376
0%
905
0%
354
48%
354
20%
691
August1st to 15thNight
41%
359
0%
1130
0%
357
41%
357
11%
902
August16th to endNight
38%
382
2%
1521
2%
382
38%
382
9%
1171
September1st to 15thNight
25%
657
2%
1737
2%
657
25%
657
7%
1545
September16th to endNight
13%
669
2%
1839
1%
669
13%
669
4%
1719
October1st to 15thNight
15%
660
1%
2046
2%
660
15%
660
3%
1883
October16th to endNight
21%
710
3%
2473
2%
710
22%
710
3%
2249
November1st to 15thNight
24%
827
2%
2725
2%
827
25%
827
4%
2454
November16th to endNight
31%
930
4%
3036
3%
930
31%
930
6%
2642
December1st to 15thNight
43%
930
2%
3240
2%
930
43%
930
5%
2792
December16th to endNight
45%
992
3%
3456
3%
992
45%
992
8%
2875

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
14%13%6%10%8%5%6%5%5%5%16%
48356
Night
8%12%6%12%10%6%9%7%6%6%14%
46615
TransparencyDay
67%7%11%11%2
47968
Night
67%8%11%10%3
46520
SeeingDay
22%6%18%24%19%10%
7493
Night
14%5%18%27%22%11%
15100

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
26%5%8%12%7%14%8%9%8%14%
757
16th to endDay
28%39%12%9%13%9%9%7%13%
1066
February1st to 15thDay
439%12%7%15%12%9%10%14%
1229
16th to endDay
17%311%13%7%11%10%11%8%12%
1344
March1st to 15thDay
37%5%10%9%7%9%12%10%9%14%
1748
16th to endDay
27%310%11%8%12%12%7%7%16%
2220
April1st to 15thDay
49%411%10%8%10%9%6%6%17%
2327
16th to endDay
9%9%6%13%14%9%8%5%5%5%10%
2553
May1st to 15thDay
13%13%7%15%13%5%5%34312%
2871
16th to endDay
12%18%12%17%8%3433313%
3240
June1st to 15thDay
16%17%8%10%6%4444418%
3240
16th to endDay
19%15%46%5%24446%26%
3240
July1st to 15thDay
22%9%36%5%3445%5%29%
3240
16th to endDay
22%9%36%6%45%5%46%26%
3197
August1st to 15thDay
21%12%48%7%45%5%5%6%20%
2822
16th to endDay
24%15%48%5%33345%20%
2681
September1st to 15thDay
24%21%5%9%6%2433412%
2211
16th to endDay
25%36%10%7%4222123
1845
October1st to 15thDay
22%25%15%9%5%222326%
1584
16th to endDay
11%17%12%19%8%45%4448%
1398
November1st to 15thDay
9%14%11%19%8%5%45%5%49%
1131
16th to endDay
312%8%17%14%47%6%6%6%11%
924
December1st to 15thDay
46%413%17%9%11%7%5%6%13%
720
16th to endDay
39%412%12%8%14%6%8%5%13%
768
January1st to 15thNight
17%5%11%12%8%13%9%8%6%15%
3180
16th to endNight
26%410%12%8%12%10%10%9%12%
3157
February1st to 15thNight
16%6%10%11%7%13%13%8%7%13%
2628
16th to endNight
15%412%13%8%12%10%11%8%11%
2128
March1st to 15thNight
26%411%11%8%13%10%10%8%13%
2188
16th to endNight
38%5%10%9%6%12%13%7%7%16%
2004
April1st to 15thNight
5%10%411%12%7%9%7%6%7%18%
1632
16th to endNight
8%11%6%10%11%8%9%6%5%5%15%
1406
May1st to 15thNight
12%13%6%13%14%7%6%33315%
1080
16th to endNight
12%16%8%17%7%36%44414%
873
June1st to 15thNight
17%14%8%6%5%44446%23%
720
16th to endNight
16%14%345%45%5%5%7%27%
720
July1st to 15thNight
20%12%23425%346%34%
720
16th to endNight
20%8%36%5%3445%5%32%
969
August1st to 15thNight
22%10%47%6%445%5%5%21%
1137
16th to endNight
20%14%36%8%3445%6%22%
1521
September1st to 15thNight
21%24%6%9%6%3433314%
1737
16th to endNight
21%30%8%9%7%233325%
1839
October1st to 15thNight
23%27%13%10%3233236%
2046
16th to endNight
13%19%11%17%8%344339%
2473
November1st to 15thNight
10%17%8%22%8%5%6%3339%
2725
16th to endNight
5%12%7%15%12%6%8%7%6%5%11%
3036
December1st to 15thNight
47%5%15%15%8%12%7%6%5%11%
3240
16th to endNight
39%5%12%12%8%12%8%7%7%11%
3456

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
59%10%12%14%2
758
16th to endDay
61%8%9%12%6%
1066
February1st to 15thDay
55%12%12%16%3
1231
16th to endDay
59%7%12%13%5%
1344
March1st to 15thDay
55%10%14%12%7%
1758
16th to endDay
55%10%8%16%8%
2220
April1st to 15thDay
60%8%8%14%7%
2327
16th to endDay
73%6%9%8%2
2553
May1st to 15thDay
75%5%8%8%1
2871
16th to endDay
77%48%8%2
3244
June1st to 15thDay
68%5%10%12%2
3240
16th to endDay
58%6%13%19%1
3240
July1st to 15thDay
55%6%16%19%1
3051
16th to endDay
57%6%18%15%1
2998
August1st to 15thDay
64%9%15%8%1
2805
16th to endDay
67%6%14%10%1
2681
September1st to 15thDay
75%5%10%7%
2211
16th to endDay
91%231
1845
October1st to 15thDay
85%35%4
1584
16th to endDay
78%8%7%5%
1398
November1st to 15thDay
78%7%8%5%
1131
16th to endDay
72%10%10%5%1
924
December1st to 15thDay
68%11%11%7%
720
16th to endDay
65%11%12%9%
768
January1st to 15thNight
60%9%13%14%2
3180
16th to endNight
58%10%11%12%7%
3157
February1st to 15thNight
59%10%8%15%5%
2630
16th to endNight
58%7%11%13%7%
2128
March1st to 15thNight
58%8%11%15%6%
2201
16th to endNight
55%11%9%14%7%
2004
April1st to 15thNight
61%6%8%14%8%
1632
16th to endNight
67%7%10%11%2
1406
May1st to 15thNight
73%49%10%1
1080
16th to endNight
73%6%8%8%3
874
June1st to 15thNight
61%5%14%17%1
720
16th to endNight
51%7%18%18%3
720
July1st to 15thNight
50%321%21%3
680
16th to endNight
53%7%20%18%1
905
August1st to 15thNight
62%8%16%11%1
1130
16th to endNight
62%6%15%14%1
1521
September1st to 15thNight
76%5%8%8%
1737
16th to endNight
84%45%4
1839
October1st to 15thNight
84%36%4
2046
16th to endNight
80%7%5%5%
2473
November1st to 15thNight
80%5%9%4
2725
16th to endNight
71%9%10%7%
3036
December1st to 15thNight
70%10%11%5%1
3240
16th to endNight
66%10%15%7%
3456

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
11%5%15%36%18%13%
60
16th to endDay
12%312%25%39%7%
64
February1st to 15thDay
8%18%31%41%
60
16th to endDay
7%13%33%29%16%
68
March1st to 15thDay
8%5%23%26%18%17%
225
16th to endDay
27%15%28%27%18%
288
April1st to 15thDay
9%217%26%25%19%
270
16th to endDay
13%9%21%27%16%12%
303
May1st to 15thDay
18%7%24%25%16%7%
648
16th to endDay
18%6%20%25%21%7%
705
June1st to 15thDay
23%6%19%25%14%11%
675
16th to endDay
26%6%16%22%17%11%
675
July1st to 15thDay
25%413%23%20%11%
645
16th to endDay
26%6%14%24%20%8%
703
August1st to 15thDay
25%415%24%23%7%
615
16th to endDay
33%317%20%12%11%
339
September1st to 15thDay
33%11%17%15%13%7%
315
16th to endDay
43%9%19%13%9%3
262
October1st to 15thDay
34%8%29%16%10%1
243
16th to endDay
18%423%32%19%1
86
November1st to 15thDay
18%5%15%20%31%10%
60
16th to endDay
10%11%21%35%18%3
60
December1st to 15thDay
315%36%38%15%
60
16th to endDay
36%28%28%15%18%
64
January1st to 15thNight
3314%26%31%20%
930
16th to endNight
4314%28%33%15%
992
February1st to 15thNight
2211%30%31%21%
858
16th to endNight
3211%32%29%19%
631
March1st to 15thNight
45%21%31%24%12%
720
16th to endNight
6%6%18%31%25%12%
768
April1st to 15thNight
10%419%27%25%12%
554
16th to endNight
13%6%18%32%21%7%
360
May1st to 15thNight
19%5%21%30%17%5%
360
16th to endNight
18%316%32%22%5%
375
June1st to 15thNight
23%7%21%22%18%6%
360
16th to endNight
22%5%18%23%23%5%
360
July1st to 15thNight
24%410%25%29%5%
340
16th to endNight
23%5%12%29%25%3
376
August1st to 15thNight
23%315%26%23%7%
359
16th to endNight
27%417%21%23%4
382
September1st to 15thNight
32%8%16%23%12%5%
657
16th to endNight
35%9%23%17%11%3
669
October1st to 15thNight
36%8%20%21%10%2
660
16th to endNight
22%6%21%27%15%7%
710
November1st to 15thNight
17%6%22%29%16%7%
827
16th to endNight
9%10%24%25%18%11%
930
December1st to 15thNight
7%416%29%25%17%
930
16th to endNight
7%5%20%30%24%12%
992
Page generated at 2017-09-19 07:32:25. Version ac04

Copyright 2017 A. Danko


Salluit Clear Sky Chart | Charts Home