Baddeck
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baddeck 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
19%
24000
9%
74812
4%
23934
24%
23934
10%
59351

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
9%
850
4%
2649
1%
847
12%
847
3%
2368
January11th to 20thNight
9%
829
3%
2601
1%
829
12%
829
3%
2295
January21st to endNight
11%
860
7%
2730
2%
860
16%
860
5%
2298
February1st to 10thNight
12%
720
5%
2340
1%
720
16%
720
5%
1958
February11th to 20thNight
10%
703
7%
2276
1%
700
17%
700
5%
1869
February21st to endNight
16%
592
11%
1780
2%
592
25%
592
9%
1409
March1st to 10thNight
14%
717
13%
2160
4%
717
23%
717
10%
1686
March11th to 20thNight
23%
720
13%
1989
5%
720
30%
720
13%
1514
March21st to endNight
17%
672
12%
2058
3%
672
27%
672
10%
1599
April1st to 10thNight
17%
540
11%
1800
5%
540
26%
540
9%
1375
April11th to 20thNight
19%
534
13%
1776
8%
534
28%
534
13%
1283
April21st to endNight
19%
540
12%
1635
6%
540
26%
540
13%
1221
May1st to 10thNight
21%
540
13%
1440
6%
540
28%
540
15%
1099
May11th to 20thNight
27%
532
15%
1417
6%
532
34%
532
20%
1019
May21st to endNight
20%
583
10%
1551
3%
582
24%
582
16%
1174
June1st to 10thNight
18%
540
6%
1440
1%
540
21%
540
12%
1162
June11th to 20thNight
25%
540
10%
1440
4%
540
29%
540
19%
1061
June21st to endNight
22%
540
4%
1440
2%
540
23%
540
13%
1167
July1st to 10thNight
29%
526
7%
1401
3%
526
31%
526
19%
1061
July11th to 20thNight
31%
522
9%
1392
5%
522
33%
522
17%
1086
July21st to endNight
30%
590
8%
1486
5%
558
31%
558
15%
1172
August1st to 10thNight
38%
538
9%
1425
6%
534
40%
534
20%
1041
August11th to 20thNight
34%
532
11%
1608
8%
532
37%
532
16%
1206
August21st to endNight
40%
594
14%
1980
12%
594
44%
594
19%
1341
September1st to 10thNight
35%
540
13%
1800
9%
540
42%
540
19%
1206
September11th to 20thNight
29%
540
17%
1800
12%
540
37%
540
17%
1243
September21st to endNight
24%
595
16%
2034
10%
595
33%
595
16%
1399
October1st to 10thNight
30%
720
14%
2160
7%
720
35%
720
18%
1513
October11th to 20thNight
26%
720
11%
2160
6%
720
30%
720
15%
1610
October21st to endNight
16%
872
10%
2535
4%
872
21%
872
9%
2052
November1st to 10thNight
15%
830
8%
2422
2%
830
20%
830
10%
1934
November11th to 20thNight
16%
850
7%
2660
3%
850
19%
850
6%
2224
November21st to endNight
12%
850
6%
2660
2%
850
17%
850
5%
2245
December1st to 10thNight
9%
850
4%
2660
1%
850
13%
850
4%
2350
December11th to 20thNight
7%
850
4%
3258
0%
849
10%
849
3%
2953
December21st to endNight
7%
929
1%
4849
0%
907
9%
907
1%
4158

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
22%11%48%7%45%5%5%6%24%
74765
Night
23%10%48%7%45%5%5%6%23%
75052
TransparencyDay
61%7%11%14%6%1
74468
Night
62%7%10%14%6%
74884
SeeingDay
31%23%27%14%41
16495
Night
29%20%26%19%5%
24009

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
17%15%6%14%11%5%6%5%5%5%10%
1516
11th to 20thDay
22%15%5%12%9%5%6%45%5%11%
1481
21st to endDay
14%13%6%15%12%5%7%445%14%
1624
February1st to 10thDay
18%14%5%12%11%48%5%5%5%13%
1620
11th to 20thDay
16%14%5%10%9%6%6%6%6%7%15%
1573
21st to endDay
11%15%7%9%10%46%446%24%
1474
March1st to 10thDay
15%14%6%9%9%46%445%22%
1796
11th to 20thDay
17%11%6%10%7%47%45%6%23%
1969
21st to endDay
18%13%6%10%8%35%44425%
2297
April1st to 10thDay
22%15%48%7%345%5%6%21%
2160
11th to 20thDay
21%12%47%5%34336%31%
2134
21st to endDay
24%13%47%5%34446%27%
2321
May1st to 10thDay
27%11%46%6%3445%6%24%
2520
11th to 20thDay
23%10%36%6%345%45%30%
2478
21st to endDay
22%10%36%5%345%5%7%30%
2724
June1st to 10thDay
31%9%36%5%35%45%7%23%
2520
11th to 20thDay
22%8%36%5%35%45%7%33%
2520
21st to endDay
31%9%47%5%24446%23%
2520
July1st to 10thDay
19%7%36%6%35%5%6%8%32%
2520
11th to 20thDay
22%7%36%5%35%5%6%8%30%
2520
21st to endDay
26%8%36%5%36%5%6%7%24%
2745
August1st to 10thDay
18%8%36%6%46%5%6%9%30%
2501
11th to 20thDay
22%7%37%6%345%6%7%30%
2291
21st to endDay
18%7%36%6%46%5%6%7%32%
2376
September1st to 10thDay
20%6%35%5%345%6%9%34%
2160
11th to 20thDay
23%7%36%6%45%45%7%30%
2160
21st to endDay
21%6%35%5%35%45%8%35%
1922
October1st to 10thDay
19%7%37%7%45%5%6%8%30%
1800
11th to 20thDay
23%8%48%6%5%5%6%5%7%23%
1800
21st to endDay
23%12%49%7%5%5%6%5%6%17%
1819
November1st to 10thDay
25%12%5%8%7%5%45%46%20%
1655
11th to 20thDay
26%17%5%9%7%45%445%13%
1520
21st to endDay
19%17%6%9%8%5%6%47%5%13%
1520
December1st to 10thDay
26%15%9%10%9%45%45%5%9%
1520
11th to 20thDay
33%13%8%11%9%46%4337%
1906
21st to endDay
22%15%10%12%9%46%5%449%
2783
January1st to 10thNight
19%15%7%11%10%5%7%6%6%5%10%
2649
11th to 20thNight
22%11%6%11%11%5%7%6%5%411%
2601
21st to endNight
17%12%6%11%10%5%8%6%6%5%14%
2730
February1st to 10thNight
18%12%412%9%5%9%6%6%5%15%
2340
11th to 20thNight
18%12%5%10%8%5%7%45%6%20%
2273
21st to endNight
11%13%6%11%8%5%6%5%6%5%24%
1780
March1st to 10thNight
14%11%6%10%9%5%445%7%24%
2151
11th to 20thNight
18%9%38%8%46%5%5%6%29%
1988
21st to endNight
19%13%5%6%6%45%446%27%
2058
April1st to 10thNight
24%10%5%6%6%445%5%6%25%
1800
11th to 20thNight
20%12%5%7%5%2435%6%31%
1776
21st to endNight
26%10%35%5%33345%32%
1635
May1st to 10thNight
29%9%345%3345%6%31%
1440
11th to 20thNight
22%10%36%32445%7%36%
1416
21st to endNight
18%9%48%6%35%45%8%29%
1550
June1st to 10thNight
32%10%45%5%34445%24%
1440
11th to 20thNight
26%7%35%6%24446%35%
1440
21st to endNight
30%10%5%6%6%345%46%22%
1440
July1st to 10thNight
21%8%36%6%445%6%7%29%
1440
11th to 20thNight
24%8%37%5%35%6%5%7%27%
1440
21st to endNight
25%9%35%5%35%6%7%6%26%
1573
August1st to 10thNight
18%7%36%6%446%6%6%35%
1436
11th to 20thNight
24%8%35%5%36%5%7%7%29%
1608
21st to endNight
17%6%26%5%346%6%9%36%
1980
September1st to 10thNight
19%5%245%36%47%8%37%
1800
11th to 20thNight
26%6%245%245%5%7%36%
1800
21st to endNight
21%7%35%5%35%5%5%6%37%
2034
October1st to 10thNight
19%7%36%5%35%5%5%8%35%
2160
11th to 20thNight
26%8%25%5%35%5%6%6%29%
2160
21st to endNight
25%11%37%6%45%5%6%7%21%
2535
November1st to 10thNight
23%11%48%7%35%46%7%23%
2422
11th to 20thNight
26%12%48%7%5%5%5%6%6%16%
2660
21st to endNight
24%12%5%8%7%5%6%6%6%7%14%
2660
December1st to 10thNight
26%14%6%10%7%45%5%5%5%12%
2660
11th to 20thNight
33%12%5%10%8%45%44410%
3293
21st to endNight
28%12%8%13%8%3433414%
4884

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
77%7%8%6%2
1517
11th to 20thDay
76%6%9%8%2
1481
21st to endDay
73%6%8%9%4
1624
February1st to 10thDay
72%7%7%8%4
1620
11th to 20thDay
67%9%11%9%41
1581
21st to endDay
62%5%10%12%9%3
1474
March1st to 10thDay
64%5%9%14%8%1
1800
11th to 20thDay
62%6%10%13%7%1
1969
21st to endDay
65%5%9%12%8%1
2297
April1st to 10thDay
64%7%9%11%7%2
2160
11th to 20thDay
55%6%10%16%12%1
2134
21st to endDay
60%7%10%13%9%1
2321
May1st to 10thDay
61%8%9%13%8%2
2520
11th to 20thDay
55%7%10%18%9%1
2482
21st to endDay
54%7%11%18%9%1
2724
June1st to 10thDay
61%7%9%16%6%
2520
11th to 20thDay
50%8%12%19%9%1
2520
21st to endDay
63%7%9%13%8%
2520
July1st to 10thDay
48%10%14%20%7%
2450
11th to 20thDay
50%9%12%21%7%1
2444
21st to endDay
57%10%12%15%6%
2592
August1st to 10thDay
50%9%15%20%6%
2487
11th to 20thDay
52%11%13%19%6%
2291
21st to endDay
49%9%14%21%7%
2376
September1st to 10thDay
47%8%14%21%9%1
2160
11th to 20thDay
54%6%11%19%9%1
2160
21st to endDay
48%6%11%24%10%1
1922
October1st to 10thDay
51%8%10%21%10%
1800
11th to 20thDay
60%7%12%16%5%
1800
21st to endDay
67%8%9%11%4
1819
November1st to 10thDay
66%6%12%13%3
1655
11th to 20thDay
73%6%10%8%3
1520
21st to endDay
72%6%13%7%3
1520
December1st to 10thDay
78%6%8%6%2
1520
11th to 20thDay
84%45%5%1
1905
21st to endDay
77%8%8%41
2783
January1st to 10thNight
78%7%7%6%2
2649
11th to 20thNight
76%7%8%7%2
2601
21st to endNight
71%6%9%10%4
2730
February1st to 10thNight
70%7%9%9%41
2340
11th to 20thNight
68%7%9%12%41
2276
21st to endNight
62%6%10%12%9%1
1780
March1st to 10thNight
61%6%9%15%9%
2160
11th to 20thNight
56%6%10%18%9%
1989
21st to endNight
61%6%9%13%9%2
2058
April1st to 10thNight
60%6%10%13%11%1
1800
11th to 20thNight
55%6%9%18%12%1
1776
21st to endNight
57%5%9%17%10%1
1635
May1st to 10thNight
55%6%9%19%10%1
1440
11th to 20thNight
51%5%10%21%12%1
1417
21st to endNight
54%7%12%20%7%1
1551
June1st to 10thNight
65%5%9%15%5%1
1440
11th to 20thNight
53%5%11%19%11%1
1440
21st to endNight
63%6%10%13%7%
1440
July1st to 10thNight
53%8%16%18%6%
1401
11th to 20thNight
55%9%9%18%8%1
1392
21st to endNight
57%9%13%16%5%1
1486
August1st to 10thNight
50%8%15%21%6%
1425
11th to 20thNight
54%8%14%18%6%
1608
21st to endNight
42%12%15%23%8%
1980
September1st to 10thNight
44%9%14%23%10%
1800
11th to 20thNight
49%7%10%23%10%1
1800
21st to endNight
50%7%9%25%9%1
2034
October1st to 10thNight
47%8%14%21%10%
2160
11th to 20thNight
54%7%14%22%3
2160
21st to endNight
63%8%10%14%5%
2535
November1st to 10thNight
60%8%14%13%5%
2422
11th to 20thNight
68%8%11%9%4
2660
21st to endNight
68%9%12%8%3
2660
December1st to 10thNight
74%8%8%7%2
2660
11th to 20thNight
81%5%6%6%2
3295
21st to endNight
77%5%9%8%1
4884

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
35%29%26%9%1
370
11th to 20thDay
31%30%26%11%1
356
21st to endDay
25%32%30%11%2
374
February1st to 10thDay
33%31%26%9%1
340
11th to 20thDay
36%34%20%8%2
336
21st to endDay
24%35%24%13%4
280
March1st to 10thDay
25%36%25%10%4
340
11th to 20thDay
26%30%28%11%41
416
21st to endDay
30%34%21%11%21
462
April1st to 10thDay
35%33%23%7%2
420
11th to 20thDay
31%32%23%12%2
412
21st to endDay
34%24%26%13%21
487
May1st to 10thDay
37%24%22%11%42
603
11th to 20thDay
30%20%27%15%8%1
624
21st to endDay
29%24%30%14%41
680
June1st to 10thDay
40%13%26%17%4
630
11th to 20thDay
26%20%33%15%5%2
630
21st to endDay
38%15%27%14%5%1
630
July1st to 10thDay
27%15%33%20%5%1
620
11th to 20thDay
26%13%33%21%7%
618
21st to endDay
32%14%29%19%6%1
685
August1st to 10thDay
21%12%36%21%9%1
620
11th to 20thDay
27%12%35%19%6%1
439
21st to endDay
22%16%35%19%7%1
495
September1st to 10thDay
23%19%37%14%6%1
450
11th to 20thDay
32%19%29%12%6%1
450
21st to endDay
27%20%27%18%7%1
360
October1st to 10thDay
24%19%34%14%8%1
360
11th to 20thDay
28%22%26%17%43
360
21st to endDay
34%24%25%11%6%1
396
November1st to 10thDay
34%25%22%13%5%1
365
11th to 20thDay
38%26%22%10%21
370
21st to endDay
37%28%21%11%21
370
December1st to 10thDay
37%29%21%9%3
370
11th to 20thDay
39%29%21%9%1
370
21st to endDay
29%36%19%12%21
407
January1st to 10thNight
30%30%25%12%3
850
11th to 20thNight
29%31%24%12%3
829
21st to endNight
25%29%27%15%4
860
February1st to 10thNight
30%24%28%16%2
720
11th to 20thNight
29%35%21%13%3
703
21st to endNight
22%26%29%18%5%
592
March1st to 10thNight
23%27%31%16%3
720
11th to 20thNight
23%25%24%20%8%
720
21st to endNight
28%24%27%17%41
672
April1st to 10thNight
31%22%24%20%2
540
11th to 20thNight
28%16%31%21%4
534
21st to endNight
33%16%26%17%6%
540
May1st to 10thNight
34%16%26%16%7%2
540
11th to 20thNight
27%13%29%23%8%
532
21st to endNight
25%16%31%23%5%
583
June1st to 10thNight
37%10%30%20%3
540
11th to 20thNight
29%10%29%26%6%
540
21st to endNight
35%8%30%23%4
540
July1st to 10thNight
27%8%29%29%7%1
526
11th to 20thNight
27%8%27%32%5%
522
21st to endNight
30%6%28%28%7%1
590
August1st to 10thNight
23%7%25%36%9%1
538
11th to 20thNight
28%6%24%30%10%1
532
21st to endNight
22%8%25%34%11%
594
September1st to 10thNight
21%10%28%30%11%1
540
11th to 20thNight
30%13%26%21%10%1
540
21st to endNight
27%14%31%22%6%1
595
October1st to 10thNight
25%13%27%27%8%
720
11th to 20thNight
30%15%24%22%8%2
720
21st to endNight
34%21%24%17%4
872
November1st to 10thNight
32%19%28%17%31
830
11th to 20thNight
37%22%21%14%5%1
850
21st to endNight
33%26%24%14%3
850
December1st to 10thNight
34%28%24%11%4
850
11th to 20thNight
37%29%22%9%3
850
21st to endNight
33%28%24%11%21
935
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