Les Escoumins
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Les Escoumins clear sky chart from 2005-11-06 to 2024-02-10.

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
30%
22874
13%
80653
7%
22785
38%
22785
15%
57242

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
17%
836
12%
4681
3%
815
26%
815
6%
3325
January11th to 20thNight
20%
756
14%
4365
6%
740
28%
740
7%
3002
January21st to endNight
27%
824
11%
4827
7%
814
40%
814
10%
3126
February1st to 10thNight
21%
759
15%
2615
6%
759
35%
759
15%
1855
February11th to 20thNight
22%
703
11%
2225
5%
700
31%
700
13%
1699
February21st to endNight
27%
592
15%
1776
8%
592
38%
592
17%
1298
March1st to 10thNight
26%
720
15%
2160
8%
720
35%
720
15%
1598
March11th to 20thNight
24%
720
16%
2014
8%
720
32%
720
18%
1484
March21st to endNight
27%
792
17%
2124
6%
792
34%
792
19%
1555
April1st to 10thNight
22%
720
13%
1800
4%
720
27%
720
16%
1424
April11th to 20thNight
30%
534
16%
1598
6%
534
38%
534
20%
1115
April21st to endNight
32%
540
15%
1620
8%
540
38%
540
18%
1149
May1st to 10thNight
34%
534
11%
1614
6%
534
41%
534
17%
1199
May11th to 20thNight
34%
354
16%
1342
13%
354
46%
354
18%
859
May21st to endNight
32%
389
11%
1357
7%
388
40%
388
15%
964
June1st to 10thNight
38%
360
6%
1260
5%
360
42%
360
15%
892
June11th to 20thNight
46%
360
8%
1260
6%
360
49%
360
19%
836
June21st to endNight
39%
360
6%
1260
5%
360
40%
360
14%
916
July1st to 10thNight
40%
350
8%
1225
5%
350
45%
350
17%
865
July11th to 20thNight
52%
348
8%
1256
9%
348
55%
348
20%
844
July21st to endNight
52%
394
7%
1486
10%
372
53%
372
14%
1046
August1st to 10thNight
52%
381
10%
1445
11%
379
56%
379
17%
983
August11th to 20thNight
48%
532
10%
1596
7%
532
50%
532
20%
1144
August21st to endNight
50%
594
16%
1782
10%
594
53%
594
23%
1207
September1st to 10thNight
43%
695
14%
1806
7%
695
46%
695
26%
1255
September11th to 20thNight
39%
720
12%
1980
6%
720
44%
720
24%
1376
September21st to endNight
39%
720
18%
1980
11%
720
44%
720
26%
1338
October1st to 10thNight
38%
720
19%
2034
10%
720
46%
720
24%
1384
October11th to 20thNight
32%
720
13%
2275
7%
720
39%
720
17%
1668
October21st to endNight
27%
792
11%
2574
5%
792
34%
792
15%
1884
November1st to 10thNight
25%
740
14%
2407
6%
740
34%
740
14%
1726
November11th to 20thNight
23%
847
14%
2653
6%
847
32%
847
14%
1947
November21st to endNight
22%
850
11%
2826
5%
850
30%
850
12%
2123
December1st to 10thNight
23%
850
12%
2850
4%
850
31%
850
13%
2128
December11th to 20thNight
22%
850
13%
3463
5%
848
31%
848
11%
2496
December21st to endNight
18%
918
9%
5117
3%
906
28%
906
6%
3532

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
17%9%47%6%45%5%5%7%32%
77795
Night
16%11%47%6%3445%6%33%
81194
TransparencyDay
51%8%13%18%9%1
77488
Night
52%7%12%18%10%1
81036
SeeingDay
21%11%31%25%10%2
14635
Night
22%9%30%28%10%1
22919

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
14%15%5%8%7%445%47%28%
2207
11th to 20thDay
11%14%5%10%7%5%6%5%5%5%28%
2520
21st to endDay
7%9%5%11%10%5%6%5%46%31%
2772
February1st to 10thDay
7%11%6%11%7%45%6%6%8%29%
1549
11th to 20thDay
12%15%5%10%10%44446%26%
1623
21st to endDay
12%10%410%6%46%5%6%7%30%
1480
March1st to 10thDay
15%14%5%7%6%36%5%46%29%
1797
11th to 20thDay
14%12%5%9%6%45%5%46%30%
1946
21st to endDay
15%16%47%6%34446%31%
2229
April1st to 10thDay
20%12%49%6%35%5%46%26%
2160
11th to 20thDay
17%8%36%5%3446%7%36%
2311
21st to endDay
22%11%36%5%35%5%46%32%
2340
May1st to 10thDay
23%9%46%5%34446%32%
2362
11th to 20thDay
19%7%35%5%4446%7%35%
2552
21st to endDay
19%6%36%5%36%5%5%7%36%
2919
June1st to 10thDay
20%8%36%8%35%45%7%30%
2700
11th to 20thDay
19%6%36%5%345%6%8%34%
2700
21st to endDay
23%8%37%5%45%5%6%7%28%
2700
July1st to 10thDay
17%7%35%6%45%6%8%8%31%
2700
11th to 20thDay
14%6%36%6%46%6%7%7%34%
2659
21st to endDay
12%6%37%7%5%6%7%8%9%31%
2744
August1st to 10thDay
15%6%37%7%46%7%7%8%28%
2465
11th to 20thDay
15%7%35%7%346%6%8%35%
2304
21st to endDay
13%6%36%8%45%6%6%8%35%
2574
September1st to 10thDay
16%6%36%6%345%6%7%39%
2152
11th to 20thDay
18%5%25%43446%6%42%
1980
21st to endDay
20%6%25%5%3345%7%39%
1980
October1st to 10thDay
17%8%36%6%36%5%5%6%37%
1926
11th to 20thDay
23%7%46%6%445%5%7%29%
1684
21st to endDay
25%11%37%5%34445%28%
1782
November1st to 10thDay
17%10%48%7%46%5%5%5%29%
1671
11th to 20thDay
19%10%47%6%35%5%5%5%30%
1525
21st to endDay
20%14%6%7%5%35%44428%
1353
December1st to 10thDay
19%12%5%7%6%35%5%5%5%26%
1330
11th to 20thDay
19%13%6%7%6%3433433%
1668
21st to endDay
19%13%47%6%2322438%
2431
January1st to 10thNight
12%16%6%10%7%34445%29%
4744
11th to 20thNight
11%14%6%10%7%34446%30%
4440
21st to endNight
6%11%49%7%45%5%5%7%36%
4884
February1st to 10thNight
10%12%5%8%8%44447%33%
2615
11th to 20thNight
10%15%7%10%7%45%445%29%
2222
21st to endNight
12%13%5%8%5%46%5%45%33%
1776
March1st to 10thNight
12%14%6%7%6%45%45%6%31%
2150
11th to 20thNight
14%14%5%9%5%33346%33%
2013
21st to endNight
14%13%47%6%3445%6%35%
2124
April1st to 10thNight
23%13%49%6%3433428%
1800
11th to 20thNight
20%9%346%35%5%5%6%36%
1598
21st to endNight
25%9%46%5%23346%35%
1620
May1st to 10thNight
25%8%37%6%35%45%5%30%
1614
11th to 20thNight
22%6%26%5%23447%38%
1341
21st to endNight
19%7%36%6%45%5%5%6%32%
1356
June1st to 10thNight
19%6%37%7%45%5%6%8%30%
1260
11th to 20thNight
17%7%25%5%2446%6%40%
1260
21st to endNight
27%6%345%35%45%6%31%
1260
July1st to 10thNight
19%6%37%6%35%5%7%8%31%
1260
11th to 20thNight
12%5%46%6%46%6%8%10%34%
1298
21st to endNight
16%7%37%5%36%6%6%8%33%
1574
August1st to 10thNight
15%6%25%6%46%5%8%9%35%
1455
11th to 20thNight
15%7%26%5%45%6%7%7%35%
1596
21st to endNight
14%6%25%5%45%5%5%8%40%
1782
September1st to 10thNight
15%6%35%5%345%5%8%41%
1806
11th to 20thNight
20%6%25%5%34446%41%
1980
21st to endNight
19%6%24434445%46%
1980
October1st to 10thNight
16%7%35%5%345%47%41%
2034
11th to 20thNight
24%8%36%5%34446%33%
2275
21st to endNight
23%8%36%5%35%447%32%
2574
November1st to 10thNight
18%11%36%6%35%45%5%33%
2407
11th to 20thNight
19%10%37%6%35%5%46%32%
2653
21st to endNight
19%13%49%5%3445%6%28%
2826
December1st to 10thNight
18%13%6%8%5%34445%30%
2850
11th to 20thNight
18%12%5%8%6%4435%5%31%
3531
21st to endNight
15%14%5%9%6%34445%32%
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
56%8%12%18%5%
2208
11th to 20thDay
58%6%10%19%6%1
2520
21st to endDay
51%8%10%19%11%
2772
February1st to 10thDay
52%8%11%16%11%3
1549
11th to 20thDay
61%5%9%14%11%1
1631
21st to endDay
51%7%8%20%13%2
1480
March1st to 10thDay
56%6%10%12%13%2
1800
11th to 20thDay
55%6%9%16%13%1
1946
21st to endDay
55%6%10%16%11%2
2229
April1st to 10thDay
59%6%9%13%10%2
2160
11th to 20thDay
47%6%12%23%10%2
2311
21st to endDay
53%6%9%18%12%2
2340
May1st to 10thDay
53%6%11%16%11%2
2362
11th to 20thDay
47%7%12%19%13%1
2556
21st to endDay
48%6%12%21%12%1
2919
June1st to 10thDay
52%8%11%16%11%1
2700
11th to 20thDay
48%8%12%19%11%2
2700
21st to endDay
54%9%12%16%8%1
2700
July1st to 10thDay
47%12%15%20%7%
2625
11th to 20thDay
45%9%15%22%8%1
2578
21st to endDay
47%13%15%20%6%
2591
August1st to 10thDay
48%14%17%17%5%
2451
11th to 20thDay
43%13%17%21%6%
2304
21st to endDay
43%10%17%22%8%
2574
September1st to 10thDay
42%9%16%22%11%1
2152
11th to 20thDay
41%9%14%25%10%1
1980
21st to endDay
44%7%16%21%11%
1980
October1st to 10thDay
46%8%15%18%12%1
1926
11th to 20thDay
53%9%15%17%5%
1684
21st to endDay
59%7%11%14%9%
1782
November1st to 10thDay
55%8%14%15%7%1
1671
11th to 20thDay
54%8%14%17%7%
1525
21st to endDay
60%6%12%14%7%
1353
December1st to 10thDay
58%9%12%13%7%1
1330
11th to 20thDay
57%6%8%18%11%
1668
21st to endDay
52%5%14%18%6%4
2431
January1st to 10thNight
59%6%11%14%10%1
4744
11th to 20thNight
55%6%11%20%7%
4440
21st to endNight
45%11%13%20%10%1
4884
February1st to 10thNight
53%6%10%17%13%2
2615
11th to 20thNight
58%7%8%16%10%1
2225
21st to endNight
54%5%9%20%10%1
1776
March1st to 10thNight
54%7%9%18%11%1
2160
11th to 20thNight
55%410%17%13%1
2014
21st to endNight
51%6%10%18%14%2
2124
April1st to 10thNight
62%38%12%13%2
1800
11th to 20thNight
49%6%10%18%16%1
1598
21st to endNight
53%47%20%13%2
1620
May1st to 10thNight
56%5%7%17%13%1
1614
11th to 20thNight
47%5%11%21%14%2
1342
21st to endNight
51%8%8%18%13%2
1357
June1st to 10thNight
51%9%10%18%10%2
1260
11th to 20thNight
45%8%11%19%13%3
1260
21st to endNight
53%9%10%16%11%1
1260
July1st to 10thNight
48%10%16%19%7%
1225
11th to 20thNight
41%12%17%21%8%
1256
21st to endNight
48%12%14%18%7%
1486
August1st to 10thNight
43%13%17%21%6%
1445
11th to 20thNight
45%12%15%19%8%1
1596
21st to endNight
41%10%15%25%8%
1782
September1st to 10thNight
42%9%16%23%10%1
1806
11th to 20thNight
45%7%16%22%10%1
1980
21st to endNight
42%7%12%26%12%
1980
October1st to 10thNight
43%7%14%21%13%2
2034
11th to 20thNight
53%7%13%21%5%
2275
21st to endNight
52%8%14%18%8%
2574
November1st to 10thNight
52%7%13%17%10%1
2407
11th to 20thNight
53%7%13%18%8%1
2653
21st to endNight
58%7%12%14%9%
2826
December1st to 10thNight
57%6%12%17%7%
2850
11th to 20thNight
56%6%11%17%10%
3532
21st to endNight
55%7%12%15%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
27%13%32%19%9%1
180
11th to 20thDay
20%18%32%22%7%1
180
21st to endDay
13%15%30%26%13%3
198
February1st to 10thDay
11%17%33%30%6%3
215
11th to 20thDay
18%15%37%24%6%1
358
21st to endDay
18%13%37%24%6%1
346
March1st to 10thDay
25%14%31%21%8%
420
11th to 20thDay
20%18%28%22%11%1
420
21st to endDay
24%12%37%19%7%1
462
April1st to 10thDay
24%17%34%19%5%2
420
11th to 20thDay
22%12%35%22%7%2
412
21st to endDay
25%12%30%25%6%2
420
May1st to 10thDay
28%12%29%19%11%1
423
11th to 20thDay
22%9%34%24%9%3
521
21st to endDay
22%12%33%22%9%2
680
June1st to 10thDay
25%9%33%23%7%3
630
11th to 20thDay
21%9%29%23%15%3
630
21st to endDay
22%7%28%30%12%1
630
July1st to 10thDay
20%5%29%30%13%2
620
11th to 20thDay
15%7%26%36%15%1
577
21st to endDay
16%6%26%35%15%3
488
August1st to 10thDay
18%5%26%35%13%2
446
11th to 20thDay
18%5%27%32%16%3
439
21st to endDay
15%10%27%27%16%4
495
September1st to 10thDay
16%9%31%27%14%3
450
11th to 20thDay
22%8%33%28%7%3
450
21st to endDay
22%8%31%26%9%4
450
October1st to 10thDay
18%9%35%26%9%4
423
11th to 20thDay
27%13%26%20%11%2
360
21st to endDay
31%13%29%19%7%1
396
November1st to 10thDay
23%16%36%20%5%1
365
11th to 20thDay
23%14%31%21%9%1
370
21st to endDay
29%17%30%18%6%
203
December1st to 10thDay
24%11%30%21%12%3
180
11th to 20thDay
24%22%31%16%6%1
180
21st to endDay
24%23%23%22%7%1
198
January1st to 10thNight
22%11%36%26%5%
848
11th to 20thNight
20%14%35%25%7%
760
21st to endNight
14%9%37%32%7%1
836
February1st to 10thNight
15%10%40%26%7%1
759
11th to 20thNight
20%15%33%26%6%
703
21st to endNight
20%9%32%28%9%1
592
March1st to 10thNight
20%10%35%28%7%1
720
11th to 20thNight
19%14%34%22%9%1
720
21st to endNight
21%11%33%28%6%1
792
April1st to 10thNight
28%11%28%25%7%1
720
11th to 20thNight
24%9%29%29%8%1
534
21st to endNight
29%7%25%28%10%1
540
May1st to 10thNight
26%7%24%33%10%
534
11th to 20thNight
25%426%31%13%1
354
21st to endNight
22%7%31%29%11%1
389
June1st to 10thNight
21%425%37%11%1
360
11th to 20thNight
19%321%35%20%2
360
21st to endNight
29%5%18%34%12%2
360
July1st to 10thNight
21%326%32%15%2
350
11th to 20thNight
13%421%43%18%1
348
21st to endNight
19%219%42%17%2
394
August1st to 10thNight
17%319%36%23%2
381
11th to 20thNight
19%420%35%20%2
532
21st to endNight
15%323%38%18%2
594
September1st to 10thNight
18%5%27%34%15%2
695
11th to 20thNight
23%428%28%14%3
720
21st to endNight
21%5%29%31%13%2
720
October1st to 10thNight
19%8%28%31%12%2
720
11th to 20thNight
27%8%27%24%14%1
720
21st to endNight
26%9%30%26%9%
792
November1st to 10thNight
23%14%31%24%8%
740
11th to 20thNight
24%13%32%21%8%2
847
21st to endNight
24%11%35%25%5%1
850
December1st to 10thNight
23%11%33%24%8%1
850
11th to 20thNight
22%14%34%23%6%1
850
21st to endNight
24%13%33%22%7%1
935
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