Carleton-sur-mer
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carleton-sur-mer 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
30%
23038
12%
74857
6%
22990
36%
22990
15%
53983

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
19%
850
8%
2838
2%
847
25%
847
9%
2233
January11th to 20thNight
20%
817
11%
2761
4%
817
29%
817
11%
2076
January21st to endNight
24%
792
18%
2736
8%
792
37%
792
15%
1821
February1st to 10thNight
22%
720
13%
2340
4%
720
33%
720
12%
1686
February11th to 20thNight
19%
702
9%
2276
3%
700
27%
700
11%
1720
February21st to endNight
24%
592
15%
1870
4%
592
37%
592
16%
1326
March1st to 10thNight
25%
720
17%
2073
7%
720
34%
720
15%
1548
March11th to 20thNight
25%
720
14%
1980
6%
720
30%
720
15%
1491
March21st to endNight
27%
792
15%
2178
5%
792
36%
792
19%
1571
April1st to 10thNight
22%
604
12%
1798
5%
604
29%
604
13%
1394
April11th to 20thNight
28%
534
17%
1598
9%
534
35%
534
17%
1123
April21st to endNight
27%
540
15%
1620
8%
540
35%
540
16%
1176
May1st to 10thNight
32%
540
10%
1562
8%
540
36%
540
16%
1152
May11th to 20thNight
34%
532
14%
1417
8%
532
40%
532
21%
1018
May21st to endNight
34%
402
11%
1369
5%
401
41%
401
16%
936
June1st to 10thNight
38%
360
7%
1260
6%
360
40%
360
16%
888
June11th to 20thNight
47%
360
9%
1260
6%
360
50%
360
19%
847
June21st to endNight
39%
360
6%
1260
4%
360
41%
360
15%
920
July1st to 10thNight
44%
350
8%
1225
6%
350
48%
350
18%
835
July11th to 20thNight
49%
348
9%
1218
10%
348
53%
348
21%
811
July21st to endNight
50%
407
11%
1360
12%
385
52%
385
19%
919
August1st to 10thNight
52%
538
8%
1600
7%
534
54%
534
22%
1098
August11th to 20thNight
51%
532
11%
1596
10%
532
52%
532
20%
1127
August21st to endNight
49%
594
17%
1782
11%
594
53%
594
27%
1141
September1st to 10thNight
41%
540
14%
1771
8%
540
48%
540
23%
1144
September11th to 20thNight
42%
704
16%
1964
10%
704
48%
704
25%
1301
September21st to endNight
41%
720
20%
1980
12%
720
48%
720
28%
1292
October1st to 10thNight
33%
720
18%
2149
9%
720
41%
720
22%
1462
October11th to 20thNight
32%
720
14%
2160
6%
720
40%
720
17%
1561
October21st to endNight
27%
792
11%
2524
5%
792
33%
792
13%
1835
November1st to 10thNight
27%
814
12%
2561
5%
814
34%
814
13%
1875
November11th to 20thNight
24%
850
12%
2660
5%
850
32%
850
11%
2015
November21st to endNight
20%
850
8%
2660
3%
850
25%
850
9%
2116
December1st to 10thNight
19%
850
9%
2812
3%
850
25%
850
9%
2189
December11th to 20thNight
16%
850
8%
3484
3%
849
22%
849
8%
2701
December21st to endNight
19%
922
6%
5155
2%
907
26%
907
5%
3635

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
19%9%47%6%45%5%5%7%30%
74668
Night
18%10%36%6%35%5%5%7%32%
75139
TransparencyDay
52%9%13%17%8%1
74355
Night
51%8%13%18%8%1
74987
SeeingDay
22%15%29%23%9%2
15189
Night
22%13%27%28%9%1
23052

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
15%15%6%8%7%45%5%5%6%23%
1327
11th to 20thDay
17%13%5%10%6%45%46%6%26%
1317
21st to endDay
10%8%48%5%45%5%7%8%35%
1619
February1st to 10thDay
9%12%410%7%5%6%6%6%7%28%
1620
11th to 20thDay
12%15%6%9%6%46%5%6%6%24%
1573
21st to endDay
9%12%5%8%6%5%6%6%6%8%30%
1384
March1st to 10thDay
13%12%6%9%6%36%5%5%8%27%
1882
11th to 20thDay
14%11%5%8%7%45%5%5%7%29%
1980
21st to endDay
14%13%47%6%3445%6%33%
2178
April1st to 10thDay
22%10%48%8%4445%6%25%
2157
11th to 20thDay
18%10%46%6%36%45%6%33%
2312
21st to endDay
22%11%48%6%34445%29%
2340
May1st to 10thDay
23%10%37%6%45%445%29%
2398
11th to 20thDay
23%9%37%6%345%5%6%31%
2481
21st to endDay
22%6%36%5%35%5%5%7%33%
2919
June1st to 10thDay
26%8%46%5%3445%6%29%
2700
11th to 20thDay
20%7%35%435%5%6%7%33%
2700
21st to endDay
25%8%37%7%445%6%6%26%
2700
July1st to 10thDay
19%7%37%7%46%6%7%9%26%
2700
11th to 20thDay
14%6%35%6%46%6%7%9%34%
2700
21st to endDay
19%6%26%6%45%5%6%8%32%
2856
August1st to 10thDay
19%6%35%6%45%7%7%7%31%
2327
11th to 20thDay
19%6%36%5%45%6%6%8%32%
2304
21st to endDay
15%5%37%6%46%6%7%9%33%
2574
September1st to 10thDay
19%6%36%5%34446%39%
2188
11th to 20thDay
22%6%35%5%33435%43%
1994
21st to endDay
20%7%36%5%3445%6%36%
1980
October1st to 10thDay
16%8%47%6%345%5%6%38%
1810
11th to 20thDay
22%9%37%7%35%46%7%28%
1800
21st to endDay
27%9%37%6%4445%6%25%
1828
November1st to 10thDay
19%10%46%8%35%46%6%28%
1517
11th to 20thDay
21%10%46%7%45%6%6%7%24%
1520
21st to endDay
20%13%5%9%6%35%5%5%6%23%
1520
December1st to 10thDay
21%12%48%6%46%5%6%7%23%
1364
11th to 20thDay
19%12%49%7%5%6%5%5%7%22%
1668
21st to endDay
14%15%5%8%6%35%445%31%
2431
January1st to 10thNight
14%14%5%9%8%46%6%6%7%21%
2838
11th to 20thNight
16%13%48%7%45%5%5%8%26%
2761
21st to endNight
10%10%47%6%36%5%6%9%34%
2736
February1st to 10thNight
9%13%5%8%7%46%6%5%7%30%
2340
11th to 20thNight
13%15%5%8%7%46%6%6%7%24%
2273
21st to endNight
12%13%6%7%5%45%5%6%7%31%
1870
March1st to 10thNight
13%12%5%8%7%35%5%5%6%31%
2064
11th to 20thNight
15%11%47%7%36%45%5%31%
1979
21st to endNight
15%11%47%5%5%6%35%5%34%
2178
April1st to 10thNight
24%12%47%5%35%44428%
1798
11th to 20thNight
20%9%45%6%33447%34%
1598
21st to endNight
26%9%36%6%2434433%
1620
May1st to 10thNight
22%10%45%5%35%445%32%
1562
11th to 20thNight
22%8%245%45%5%47%34%
1416
21st to endNight
20%6%35%6%36%36%7%35%
1369
June1st to 10thNight
27%7%26%43435%7%32%
1260
11th to 20thNight
22%6%25%434447%38%
1260
21st to endNight
29%6%245%35%45%5%32%
1260
July1st to 10thNight
17%10%26%6%25%5%6%7%35%
1260
11th to 20thNight
18%6%35%5%36%45%7%38%
1260
21st to endNight
19%7%36%4245%5%7%36%
1439
August1st to 10thNight
15%6%25%5%35%6%6%9%37%
1612
11th to 20thNight
21%6%345%35%5%6%8%35%
1596
21st to endNight
15%5%3443446%7%45%
1782
September1st to 10thNight
20%5%144245%6%7%43%
1771
11th to 20thNight
21%5%25%433446%45%
1964
21st to endNight
19%5%24423346%48%
1980
October1st to 10thNight
20%7%35%434446%40%
2149
11th to 20thNight
22%7%25%6%45%447%34%
2160
21st to endNight
24%9%25%5%35%5%5%7%30%
2524
November1st to 10thNight
22%8%35%5%45%5%5%6%32%
2561
11th to 20thNight
21%10%46%5%45%6%6%6%27%
2660
21st to endNight
20%12%47%6%45%5%6%7%24%
2660
December1st to 10thNight
22%13%48%6%3445%5%26%
2812
11th to 20thNight
23%11%47%7%45%5%6%6%23%
3531
21st to endNight
15%14%48%7%46%5%5%6%28%
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
60%10%12%12%6%1
1328
11th to 20thDay
58%7%12%14%9%
1317
21st to endDay
44%8%13%23%12%
1619
February1st to 10thDay
53%7%10%20%8%2
1620
11th to 20thDay
57%8%11%16%8%
1581
21st to endDay
49%7%10%22%9%2
1384
March1st to 10thDay
53%8%12%17%9%2
1886
11th to 20thDay
52%8%11%17%9%2
1980
21st to endDay
50%6%11%17%13%2
2178
April1st to 10thDay
57%7%9%15%10%2
2157
11th to 20thDay
51%8%10%18%12%2
2312
21st to endDay
55%8%8%17%10%2
2340
May1st to 10thDay
57%7%9%16%10%2
2398
11th to 20thDay
52%8%12%17%10%
2485
21st to endDay
50%8%12%19%11%1
2919
June1st to 10thDay
55%8%12%15%10%1
2700
11th to 20thDay
47%9%14%18%10%2
2700
21st to endDay
57%9%12%14%7%
2700
July1st to 10thDay
50%11%16%16%6%
2625
11th to 20thDay
43%11%16%21%9%
2619
21st to endDay
48%11%16%18%7%
2695
August1st to 10thDay
48%11%17%19%4
2314
11th to 20thDay
46%12%19%18%5%1
2304
21st to endDay
44%11%19%20%6%
2574
September1st to 10thDay
46%7%16%23%8%
2188
11th to 20thDay
44%6%15%23%11%
1994
21st to endDay
46%9%13%22%9%1
1980
October1st to 10thDay
46%8%17%20%9%1
1810
11th to 20thDay
55%8%14%18%5%
1800
21st to endDay
58%8%11%16%6%1
1828
November1st to 10thDay
54%9%14%16%6%
1517
11th to 20thDay
57%10%13%15%4
1520
21st to endDay
62%9%15%11%3
1520
December1st to 10thDay
60%10%14%12%4
1364
11th to 20thDay
58%10%15%12%5%
1668
21st to endDay
52%10%15%12%8%2
2431
January1st to 10thNight
59%10%13%13%4
2838
11th to 20thNight
56%8%12%15%7%1
2761
21st to endNight
45%9%13%21%13%1
2736
February1st to 10thNight
53%7%10%17%10%3
2340
11th to 20thNight
57%7%11%16%7%1
2276
21st to endNight
51%6%12%19%11%2
1870
March1st to 10thNight
53%8%8%20%10%1
2073
11th to 20thNight
53%8%10%17%11%1
1980
21st to endNight
50%6%12%17%14%2
2178
April1st to 10thNight
59%6%8%12%13%2
1798
11th to 20thNight
49%7%10%18%14%2
1598
21st to endNight
53%6%9%16%14%2
1620
May1st to 10thNight
53%7%12%16%12%1
1562
11th to 20thNight
47%8%12%22%11%1
1417
21st to endNight
47%8%11%20%12%1
1370
June1st to 10thNight
51%7%13%18%10%
1260
11th to 20thNight
47%6%12%19%14%1
1260
21st to endNight
54%8%12%17%9%1
1260
July1st to 10thNight
45%11%16%22%6%
1225
11th to 20thNight
44%9%16%23%8%1
1218
21st to endNight
46%8%15%21%9%
1360
August1st to 10thNight
41%12%20%22%5%
1600
11th to 20thNight
46%10%19%19%6%
1596
21st to endNight
37%9%18%28%8%
1782
September1st to 10thNight
39%9%16%26%10%1
1771
11th to 20thNight
40%7%16%24%12%1
1964
21st to endNight
38%7%14%27%13%1
1980
October1st to 10thNight
45%6%15%22%10%1
2149
11th to 20thNight
50%8%14%21%7%
2160
21st to endNight
52%8%15%17%7%
2524
November1st to 10thNight
52%9%16%16%7%1
2561
11th to 20thNight
56%9%14%16%5%
2660
21st to endNight
59%11%14%12%31
2660
December1st to 10thNight
60%8%13%14%4
2812
11th to 20thNight
59%10%12%15%4
3532
21st to endNight
54%10%15%14%5%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%24%27%19%6%1
180
11th to 20thDay
28%20%26%18%6%1
170
21st to endDay
12%19%35%24%9%
211
February1st to 10thDay
18%18%33%23%7%1
340
11th to 20thDay
19%25%30%20%6%1
336
21st to endDay
15%20%35%22%7%1
304
March1st to 10thDay
22%18%33%20%5%1
420
11th to 20thDay
21%18%30%22%9%1
420
21st to endDay
19%20%32%19%7%3
462
April1st to 10thDay
27%23%30%15%31
420
11th to 20thDay
21%19%31%21%6%1
412
21st to endDay
26%19%26%21%6%2
420
May1st to 10thDay
27%12%33%20%7%1
481
11th to 20thDay
24%14%27%21%11%2
624
21st to endDay
24%16%31%22%7%1
680
June1st to 10thDay
29%13%28%22%7%1
630
11th to 20thDay
23%15%24%24%12%2
630
21st to endDay
25%9%30%25%9%2
630
July1st to 10thDay
20%9%32%26%10%2
620
11th to 20thDay
15%8%29%33%13%1
618
21st to endDay
21%5%26%33%13%2
633
August1st to 10thDay
18%7%30%29%13%2
446
11th to 20thDay
17%10%29%29%12%3
439
21st to endDay
16%10%28%28%13%4
495
September1st to 10thDay
20%9%32%26%11%2
450
11th to 20thDay
23%13%28%23%10%2
450
21st to endDay
22%18%27%21%10%3
450
October1st to 10thDay
18%13%31%24%12%2
365
11th to 20thDay
24%18%24%21%13%1
360
21st to endDay
33%21%20%17%8%1
396
November1st to 10thDay
22%19%28%22%7%1
365
11th to 20thDay
28%19%25%19%7%1
370
21st to endDay
25%22%27%21%41
370
December1st to 10thDay
28%14%30%18%8%1
214
11th to 20thDay
25%24%32%15%31
180
21st to endDay
20%28%30%20%3
198
January1st to 10thNight
18%17%34%25%6%1
850
11th to 20thNight
23%16%29%27%5%
817
21st to endNight
15%20%31%27%7%
792
February1st to 10thNight
14%20%32%26%7%1
720
11th to 20thNight
22%17%32%23%5%
703
21st to endNight
17%14%36%25%7%1
592
March1st to 10thNight
19%16%30%28%6%
720
11th to 20thNight
21%16%29%24%9%1
720
21st to endNight
18%15%29%28%9%1
792
April1st to 10thNight
30%13%27%25%5%
604
11th to 20thNight
22%13%29%27%8%1
534
21st to endNight
31%8%23%28%9%1
540
May1st to 10thNight
27%10%23%30%10%
540
11th to 20thNight
23%9%26%29%11%2
532
21st to endNight
23%8%29%31%9%
402
June1st to 10thNight
28%5%21%36%11%
360
11th to 20thNight
22%5%18%37%17%
360
21st to endNight
30%318%35%13%1
360
July1st to 10thNight
19%422%39%14%1
350
11th to 20thNight
16%5%20%41%17%1
348
21st to endNight
22%315%40%18%1
407
August1st to 10thNight
16%318%42%20%1
538
11th to 20thNight
22%415%39%19%1
532
21st to endNight
17%5%22%35%20%2
594
September1st to 10thNight
20%7%26%34%12%1
540
11th to 20thNight
22%9%20%33%15%1
704
21st to endNight
20%10%24%34%12%
720
October1st to 10thNight
23%10%28%28%10%1
720
11th to 20thNight
24%10%28%25%13%1
720
21st to endNight
28%14%25%25%7%
792
November1st to 10thNight
27%16%25%25%6%1
814
11th to 20thNight
25%18%27%21%7%1
850
21st to endNight
25%18%29%20%7%
850
December1st to 10thNight
26%15%29%22%8%
850
11th to 20thNight
26%22%30%17%5%
850
21st to endNight
24%19%28%23%42
935
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