Bouctouche
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bouctouche clear sky chart from 2005-11-06 to 2024-01-22.

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
28%
23356
13%
74887
6%
23299
35%
23299
16%
53505

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
16%
850
11%
2838
2%
847
25%
847
12%
2081
January11th to 20thNight
19%
837
12%
2782
4%
837
29%
837
12%
2053
January21st to endNight
25%
800
19%
2598
7%
800
39%
800
18%
1733
February1st to 10thNight
20%
720
13%
2340
4%
720
31%
720
16%
1664
February11th to 20thNight
15%
703
12%
2276
3%
700
26%
700
13%
1698
February21st to endNight
26%
592
16%
1914
6%
592
38%
592
18%
1349
March1st to 10thNight
21%
719
16%
2003
7%
719
30%
719
16%
1521
March11th to 20thNight
24%
720
15%
1980
6%
720
31%
720
18%
1454
March21st to endNight
23%
792
15%
2178
7%
792
31%
792
17%
1642
April1st to 10thNight
23%
566
11%
1826
6%
566
29%
566
12%
1396
April11th to 20thNight
28%
534
16%
1634
7%
534
35%
534
18%
1167
April21st to endNight
27%
540
13%
1620
7%
540
34%
540
17%
1194
May1st to 10thNight
32%
540
13%
1548
8%
540
38%
540
18%
1144
May11th to 20thNight
34%
532
14%
1417
6%
532
40%
532
21%
1035
May21st to endNight
32%
583
10%
1551
4%
582
38%
582
21%
1130
June1st to 10thNight
35%
386
8%
1286
8%
386
37%
386
16%
923
June11th to 20thNight
39%
360
12%
1260
10%
360
43%
360
17%
857
June21st to endNight
38%
360
7%
1260
7%
360
40%
360
14%
924
July1st to 10thNight
46%
350
12%
1225
8%
350
52%
350
19%
813
July11th to 20thNight
48%
348
11%
1218
9%
348
52%
348
20%
809
July21st to endNight
46%
585
11%
1523
9%
553
48%
553
20%
1126
August1st to 10thNight
50%
538
11%
1600
9%
534
52%
534
23%
1086
August11th to 20thNight
50%
532
12%
1596
8%
532
53%
532
20%
1119
August21st to endNight
47%
594
16%
1826
10%
594
51%
594
26%
1177
September1st to 10thNight
40%
540
16%
1800
10%
540
48%
540
25%
1122
September11th to 20thNight
41%
638
19%
1898
14%
638
48%
638
26%
1223
September21st to endNight
38%
720
21%
2015
11%
720
46%
720
27%
1310
October1st to 10thNight
34%
720
17%
2160
9%
720
40%
720
23%
1456
October11th to 20thNight
29%
720
19%
2160
8%
720
39%
720
21%
1462
October21st to endNight
21%
792
14%
2416
5%
792
29%
792
15%
1776
November1st to 10thNight
23%
825
14%
2581
6%
825
32%
825
16%
1830
November11th to 20thNight
21%
850
15%
2660
6%
850
31%
850
14%
1942
November21st to endNight
17%
850
11%
2660
3%
850
27%
850
12%
1974
December1st to 10thNight
15%
850
12%
2660
2%
850
25%
850
13%
2001
December11th to 20thNight
12%
849
11%
3386
2%
849
22%
849
8%
2595
December21st to endNight
14%
921
7%
5192
2%
907
25%
907
6%
3719

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
18%9%46%6%35%45%7%33%
74785
Night
19%10%46%5%3445%6%33%
75147
TransparencyDay
51%7%12%19%9%1
74481
Night
52%6%12%19%9%1
74986
SeeingDay
22%10%29%28%10%1
15620
Night
23%10%32%27%8%1
23372

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
18%16%5%8%434346%29%
1327
11th to 20thDay
20%14%6%8%6%34345%27%
1393
21st to endDay
11%11%46%6%2435%7%40%
1792
February1st to 10thDay
16%10%48%6%45%5%5%6%33%
1620
11th to 20thDay
17%13%5%7%6%46%5%5%5%28%
1573
21st to endDay
11%12%6%8%5%45%5%5%7%34%
1340
March1st to 10thDay
17%15%6%8%5%36%445%28%
1952
11th to 20thDay
14%12%5%11%7%34346%31%
1980
21st to endDay
19%14%5%7%5%34445%31%
2178
April1st to 10thDay
21%10%5%8%6%45%446%26%
2133
11th to 20thDay
22%9%35%5%34447%33%
2271
21st to endDay
24%11%46%5%44447%27%
2340
May1st to 10thDay
25%9%37%6%34446%28%
2411
11th to 20thDay
22%9%36%43445%6%34%
2478
21st to endDay
18%9%35%6%45%45%7%34%
2724
June1st to 10thDay
26%9%36%5%35%45%7%26%
2689
11th to 20thDay
20%6%36%5%35%5%5%8%34%
2700
21st to endDay
24%9%36%5%45%446%29%
2700
July1st to 10thDay
16%6%35%6%35%6%6%9%34%
2700
11th to 20thDay
13%6%35%6%46%7%7%9%34%
2684
21st to endDay
15%7%37%6%45%6%7%9%30%
2697
August1st to 10thDay
16%5%36%7%35%5%6%8%36%
2327
11th to 20thDay
15%5%37%6%5%6%6%7%8%33%
2304
21st to endDay
13%6%245%445%6%8%42%
2530
September1st to 10thDay
16%5%25%5%245%6%9%42%
2160
11th to 20thDay
18%6%35%5%44445%42%
2058
21st to endDay
16%6%35%5%34346%44%
1944
October1st to 10thDay
17%7%246%34447%41%
1800
11th to 20thDay
17%10%37%6%345%46%35%
1800
21st to endDay
21%8%36%6%35%5%5%6%32%
1939
November1st to 10thDay
18%9%37%5%46%5%5%7%31%
1495
11th to 20thDay
18%12%36%6%45%447%31%
1520
21st to endDay
17%14%46%5%345%6%6%30%
1520
December1st to 10thDay
23%13%5%6%5%23345%29%
1520
11th to 20thDay
17%17%6%8%6%3343428%
1755
21st to endDay
19%11%5%10%7%33335%30%
2431
January1st to 10thNight
16%14%5%8%6%35%446%29%
2838
11th to 20thNight
16%12%48%6%44446%31%
2782
21st to endNight
13%11%5%6%6%34446%38%
2598
February1st to 10thNight
17%11%47%6%36%5%5%6%31%
2340
11th to 20thNight
17%14%48%7%45%445%27%
2273
21st to endNight
13%14%47%7%345%46%33%
1914
March1st to 10thNight
18%14%5%8%6%34445%29%
1994
11th to 20thNight
18%10%47%5%36%5%46%32%
1979
21st to endNight
19%13%5%8%6%3433432%
2178
April1st to 10thNight
24%12%37%7%35%5%45%26%
1826
11th to 20thNight
23%10%36%434446%33%
1634
21st to endNight
23%12%46%5%3435%6%30%
1620
May1st to 10thNight
26%10%25%4345%46%32%
1548
11th to 20thNight
22%9%35%6%24347%34%
1416
21st to endNight
16%8%36%6%35%5%6%7%35%
1550
June1st to 10thNight
24%9%36%3245%6%7%30%
1286
11th to 20thNight
21%8%35%434447%36%
1260
21st to endNight
25%7%47%435%5%46%30%
1260
July1st to 10thNight
17%8%25%5%35%6%6%8%35%
1260
11th to 20thNight
11%7%46%7%36%5%7%8%35%
1260
21st to endNight
15%8%49%6%36%5%5%7%33%
1612
August1st to 10thNight
14%6%26%5%46%5%6%7%38%
1612
11th to 20thNight
14%7%36%7%5%5%5%6%7%36%
1596
21st to endNight
13%6%35%6%2446%8%42%
1826
September1st to 10thNight
16%6%345%3445%7%44%
1800
11th to 20thNight
17%7%245%2335%5%46%
1898
21st to endNight
16%6%25%4235%5%6%45%
2015
October1st to 10thNight
19%6%36%5%3445%7%40%
2160
11th to 20thNight
18%6%26%6%34447%39%
2160
21st to endNight
23%8%35%6%44446%33%
2416
November1st to 10thNight
20%10%35%4345%5%6%35%
2581
11th to 20thNight
19%10%47%6%45%446%32%
2660
21st to endNight
22%11%36%6%34445%32%
2660
December1st to 10thNight
24%11%46%43445%5%29%
2660
11th to 20thNight
20%16%5%8%5%3434428%
3439
21st to endNight
23%13%5%9%5%23345%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
58%6%10%15%10%
1328
11th to 20thDay
61%6%8%14%10%1
1393
21st to endDay
44%6%13%19%17%1
1792
February1st to 10thDay
52%5%12%18%11%2
1620
11th to 20thDay
57%6%10%17%9%1
1581
21st to endDay
48%6%12%20%12%3
1340
March1st to 10thDay
57%6%8%19%9%1
1956
11th to 20thDay
55%410%19%9%2
1980
21st to endDay
56%6%8%18%10%3
2178
April1st to 10thDay
59%5%9%15%9%4
2133
11th to 20thDay
51%5%11%20%12%2
2271
21st to endDay
55%7%9%15%11%3
2340
May1st to 10thDay
56%6%10%16%10%1
2411
11th to 20thDay
51%6%9%22%11%1
2482
21st to endDay
49%8%13%21%8%1
2724
June1st to 10thDay
56%7%13%17%7%
2689
11th to 20thDay
48%8%13%21%9%1
2700
21st to endDay
55%8%12%16%8%1
2700
July1st to 10thDay
43%9%17%22%8%
2625
11th to 20thDay
43%10%18%21%9%
2603
21st to endDay
48%9%16%20%7%
2546
August1st to 10thDay
44%9%15%25%7%
2314
11th to 20thDay
45%10%18%22%6%
2304
21st to endDay
38%9%16%26%11%
2530
September1st to 10thDay
38%8%18%25%12%
2160
11th to 20thDay
44%6%11%24%14%1
2058
21st to endDay
42%5%12%25%15%1
1944
October1st to 10thDay
43%6%12%27%11%1
1800
11th to 20thDay
49%7%12%23%8%1
1800
21st to endDay
53%6%12%18%11%1
1939
November1st to 10thDay
51%9%12%20%8%1
1495
11th to 20thDay
53%7%14%14%11%1
1520
21st to endDay
54%8%15%16%6%
1520
December1st to 10thDay
59%8%12%14%6%
1520
11th to 20thDay
61%5%9%16%7%1
1754
21st to endDay
58%7%13%16%6%1
2431
January1st to 10thNight
57%6%12%17%8%1
2838
11th to 20thNight
56%7%12%17%8%1
2782
21st to endNight
48%412%23%12%2
2598
February1st to 10thNight
53%5%11%17%11%2
2340
11th to 20thNight
58%5%9%16%10%1
2276
21st to endNight
51%6%9%19%12%3
1914
March1st to 10thNight
57%5%8%18%9%2
2003
11th to 20thNight
54%5%9%18%12%2
1980
21st to endNight
57%47%18%11%3
2178
April1st to 10thNight
60%6%8%13%11%3
1826
11th to 20thNight
53%5%10%20%12%1
1634
21st to endNight
55%5%11%14%14%1
1620
May1st to 10thNight
54%5%10%18%11%2
1548
11th to 20thNight
50%8%10%20%11%1
1417
21st to endNight
46%10%15%19%9%1
1551
June1st to 10thNight
52%7%15%17%8%
1286
11th to 20thNight
48%8%11%22%10%1
1260
21st to endNight
55%8%13%14%9%1
1260
July1st to 10thNight
44%9%16%23%8%
1225
11th to 20thNight
43%10%17%22%9%
1218
21st to endNight
49%9%14%19%8%
1523
August1st to 10thNight
43%9%16%25%7%
1600
11th to 20thNight
46%10%19%20%6%
1596
21st to endNight
39%8%17%25%10%
1826
September1st to 10thNight
39%8%12%29%13%
1800
11th to 20thNight
40%6%12%28%13%1
1898
21st to endNight
39%7%12%26%15%1
2015
October1st to 10thNight
44%7%12%25%12%
2160
11th to 20thNight
45%6%14%27%7%
2160
21st to endNight
54%6%11%19%9%1
2416
November1st to 10thNight
50%7%14%20%9%1
2581
11th to 20thNight
54%6%12%18%9%1
2660
21st to endNight
55%7%14%17%7%
2660
December1st to 10thNight
57%7%14%15%7%
2660
11th to 20thNight
61%5%10%17%7%
3441
21st to endNight
59%6%12%16%6%1
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%16%31%23%3
180
11th to 20thDay
26%17%35%17%5%
218
21st to endDay
16%11%35%30%7%
378
February1st to 10thDay
24%13%35%24%41
340
11th to 20thDay
24%16%36%20%5%
336
21st to endDay
15%13%37%27%8%
284
March1st to 10thDay
23%13%37%24%21
420
11th to 20thDay
17%15%34%25%8%1
420
21st to endDay
26%11%33%24%5%2
462
April1st to 10thDay
26%14%36%20%4
420
11th to 20thDay
24%10%32%25%7%1
412
21st to endDay
28%9%28%27%8%2
420
May1st to 10thDay
29%8%31%23%9%
494
11th to 20thDay
24%8%27%27%13%1
624
21st to endDay
22%10%27%33%7%1
680
June1st to 10thDay
29%7%26%26%9%1
630
11th to 20thDay
22%7%25%33%11%2
630
21st to endDay
26%5%22%32%14%1
630
July1st to 10thDay
20%326%35%15%1
620
11th to 20thDay
14%5%22%39%17%2
618
21st to endDay
15%321%44%15%2
637
August1st to 10thDay
14%421%41%19%2
446
11th to 20thDay
17%5%21%35%19%3
439
21st to endDay
16%6%22%35%18%3
495
September1st to 10thDay
14%5%28%35%14%3
450
11th to 20thDay
23%10%23%29%12%3
450
21st to endDay
18%9%30%30%10%3
432
October1st to 10thDay
19%11%25%27%16%1
360
11th to 20thDay
20%11%31%22%14%1
360
21st to endDay
27%13%33%20%7%1
396
November1st to 10thDay
22%16%30%25%6%1
365
11th to 20thDay
26%16%33%21%41
370
21st to endDay
26%16%38%19%2
370
December1st to 10thDay
28%15%32%21%4
370
11th to 20thDay
26%21%37%13%3
266
21st to endDay
18%25%34%19%4
198
January1st to 10thNight
24%11%39%22%4
850
11th to 20thNight
22%14%36%23%5%
837
21st to endNight
19%11%39%23%8%
800
February1st to 10thNight
23%11%40%22%4
720
11th to 20thNight
26%10%41%20%31
703
21st to endNight
21%8%35%29%6%
592
March1st to 10thNight
23%10%37%27%3
720
11th to 20thNight
25%9%33%24%8%1
720
21st to endNight
25%11%32%25%6%1
792
April1st to 10thNight
30%11%28%27%4
566
11th to 20thNight
27%8%31%27%7%
534
21st to endNight
26%10%30%23%10%1
540
May1st to 10thNight
31%7%25%26%9%1
540
11th to 20thNight
26%428%29%12%1
532
21st to endNight
19%7%35%32%7%
583
June1st to 10thNight
29%6%25%32%9%
386
11th to 20thNight
23%5%23%39%9%1
360
21st to endNight
24%425%33%13%1
360
July1st to 10thNight
19%326%39%14%1
350
11th to 20thNight
16%324%45%12%1
348
21st to endNight
16%5%22%44%12%1
585
August1st to 10thNight
18%322%41%15%1
538
11th to 20thNight
17%420%39%18%2
532
21st to endNight
15%424%38%18%1
594
September1st to 10thNight
18%5%30%35%12%
540
11th to 20thNight
20%8%27%33%11%1
638
21st to endNight
18%9%32%31%9%1
720
October1st to 10thNight
22%7%33%27%11%1
720
11th to 20thNight
21%11%34%25%9%1
720
21st to endNight
28%16%30%22%4
792
November1st to 10thNight
25%14%33%23%4
825
11th to 20thNight
23%18%32%19%6%1
850
21st to endNight
27%18%31%20%3
850
December1st to 10thNight
29%14%37%16%4
850
11th to 20thNight
26%21%34%16%4
850
21st to endNight
28%15%34%19%41
935
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