Miramichi (Bay du Vin)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Miramichi (Bay du Vin) clear sky chart from 2005-11-06 to 2024-01-31.

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
22%
23286
14%
75029
5%
23228
33%
23228
16%
52453

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
12%
850
12%
2838
1%
847
24%
847
10%
2076
January11th to 20thNight
16%
837
14%
2822
3%
837
30%
837
13%
1997
January21st to endNight
20%
835
19%
2753
5%
835
36%
835
17%
1795
February1st to 10thNight
16%
720
15%
2340
4%
720
30%
720
15%
1621
February11th to 20thNight
12%
702
12%
2276
2%
700
25%
700
11%
1674
February21st to endNight
19%
592
18%
1898
4%
592
35%
592
15%
1352
March1st to 10thNight
18%
720
17%
2026
5%
720
29%
720
16%
1520
March11th to 20thNight
20%
720
16%
1980
5%
720
29%
720
17%
1436
March21st to endNight
20%
792
17%
2178
5%
792
30%
792
16%
1615
April1st to 10thNight
19%
578
11%
1838
5%
578
25%
578
12%
1370
April11th to 20thNight
20%
534
17%
1601
7%
534
29%
534
19%
1118
April21st to endNight
24%
540
14%
1620
6%
540
31%
540
15%
1195
May1st to 10thNight
25%
540
14%
1553
7%
540
31%
540
17%
1128
May11th to 20thNight
28%
532
15%
1417
6%
532
37%
532
21%
1021
May21st to endNight
26%
532
12%
1500
4%
531
33%
531
20%
1044
June1st to 10thNight
27%
360
9%
1260
5%
360
32%
360
14%
913
June11th to 20thNight
36%
360
11%
1260
8%
360
41%
360
18%
850
June21st to endNight
26%
360
6%
1260
3%
360
30%
360
14%
926
July1st to 10thNight
30%
350
11%
1225
4%
350
39%
350
20%
810
July11th to 20thNight
40%
348
11%
1218
10%
348
45%
348
21%
790
July21st to endNight
39%
521
11%
1463
8%
492
42%
492
20%
1022
August1st to 10thNight
36%
538
10%
1600
6%
534
41%
534
22%
1081
August11th to 20thNight
41%
532
13%
1596
8%
532
45%
532
21%
1113
August21st to endNight
40%
594
17%
1803
9%
594
46%
594
25%
1156
September1st to 10thNight
30%
540
17%
1800
8%
540
41%
540
25%
1100
September11th to 20thNight
34%
661
20%
1921
11%
661
43%
661
27%
1199
September21st to endNight
29%
720
21%
1999
9%
720
38%
720
27%
1296
October1st to 10thNight
31%
720
20%
2160
9%
720
41%
720
23%
1421
October11th to 20thNight
24%
720
19%
2160
6%
720
35%
720
21%
1441
October21st to endNight
17%
792
15%
2452
4%
792
29%
792
15%
1732
November1st to 10thNight
18%
821
16%
2575
4%
821
30%
821
15%
1791
November11th to 20thNight
18%
850
17%
2660
6%
850
30%
850
14%
1906
November21st to endNight
16%
850
12%
2660
3%
850
27%
850
12%
1939
December1st to 10thNight
12%
850
15%
2663
1%
850
26%
850
12%
1968
December11th to 20thNight
12%
850
13%
3476
3%
849
25%
849
9%
2574
December21st to endNight
13%
925
9%
5178
2%
907
26%
907
6%
3463

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%8%36%5%35%5%5%7%34%
74828
Night
19%9%46%5%3445%6%34%
75302
TransparencyDay
50%6%12%21%11%1
74522
Night
51%5%12%21%10%1
75143
SeeingDay
24%14%32%20%7%1
15482
Night
25%13%33%22%7%1
23297

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%14%5%8%5%2435%5%31%
1327
11th to 20thDay
18%13%48%6%35%5%46%28%
1354
21st to endDay
12%9%46%5%335%6%6%41%
1828
February1st to 10thDay
14%11%48%5%346%6%5%34%
1620
11th to 20thDay
16%13%48%6%45%5%5%6%29%
1573
21st to endDay
11%10%5%7%7%46%5%46%34%
1354
March1st to 10thDay
17%16%5%5%5%25%447%31%
1929
11th to 20thDay
16%10%5%7%6%445%36%35%
1980
21st to endDay
19%13%46%434445%33%
2178
April1st to 10thDay
21%10%46%6%45%5%47%29%
2121
11th to 20thDay
21%8%25%5%34446%37%
2307
21st to endDay
26%11%35%5%24445%30%
2340
May1st to 10thDay
26%8%36%5%35%45%5%30%
2407
11th to 20thDay
24%7%36%6%34445%34%
2478
21st to endDay
20%6%35%5%345%6%9%35%
2790
June1st to 10thDay
28%8%35%5%345%5%7%28%
2700
11th to 20thDay
20%6%26%6%35%46%8%34%
2700
21st to endDay
28%7%36%6%35%45%7%27%
2700
July1st to 10thDay
17%6%36%6%45%5%6%8%34%
2700
11th to 20thDay
13%6%36%6%46%6%7%9%36%
2700
21st to endDay
17%6%36%6%46%6%7%8%32%
2744
August1st to 10thDay
16%6%36%6%45%5%7%8%35%
2327
11th to 20thDay
14%7%36%7%46%6%6%8%34%
2304
21st to endDay
14%6%245%35%5%6%9%41%
2552
September1st to 10thDay
16%5%26%6%3445%8%42%
2160
11th to 20thDay
17%7%25%5%34335%45%
2036
21st to endDay
19%6%245%34446%43%
1960
October1st to 10thDay
15%7%26%5%34447%43%
1800
11th to 20thDay
20%8%26%5%34445%38%
1800
21st to endDay
25%6%26%6%345%5%5%33%
1902
November1st to 10thDay
20%8%36%6%345%5%7%33%
1502
11th to 20thDay
20%10%46%5%25%5%6%6%33%
1520
21st to endDay
19%12%47%5%35%5%46%31%
1520
December1st to 10thDay
23%13%36%434446%31%
1516
11th to 20thDay
17%13%6%8%6%44445%28%
1668
21st to endDay
19%10%36%5%34435%37%
2431
January1st to 10thNight
16%12%5%9%7%45%5%5%5%29%
2838
11th to 20thNight
17%11%47%5%3345%7%33%
2822
21st to endNight
12%9%46%5%35%5%46%39%
2753
February1st to 10thNight
15%11%47%6%45%46%6%33%
2340
11th to 20thNight
17%15%5%6%6%35%445%30%
2273
21st to endNight
14%13%5%7%5%35%5%46%32%
1898
March1st to 10thNight
17%14%5%6%5%45%44432%
2017
11th to 20thNight
18%9%46%6%45%5%5%6%33%
1979
21st to endNight
18%11%48%5%35%43434%
2178
April1st to 10thNight
27%10%36%5%335%45%28%
1838
11th to 20thNight
23%10%35%33445%7%34%
1601
21st to endNight
23%11%47%5%34436%31%
1620
May1st to 10thNight
25%11%35%4235%45%33%
1553
11th to 20thNight
24%6%36%5%246%5%6%34%
1416
21st to endNight
17%8%36%6%35%45%9%35%
1499
June1st to 10thNight
27%7%45%5%3445%5%30%
1260
11th to 20thNight
20%7%35%5%35%6%5%7%36%
1260
21st to endNight
27%9%35%6%4435%5%28%
1260
July1st to 10thNight
17%8%35%435%5%5%7%38%
1260
11th to 20thNight
13%6%26%7%46%5%7%9%36%
1260
21st to endNight
16%7%37%6%45%5%6%8%34%
1549
August1st to 10thNight
18%5%25%6%45%5%6%7%38%
1612
11th to 20thNight
15%7%35%6%36%5%6%9%34%
1596
21st to endNight
13%5%26%5%35%46%8%42%
1803
September1st to 10thNight
18%5%25%333448%44%
1800
11th to 20thNight
15%6%25%434447%47%
1921
21st to endNight
18%5%2442445%6%45%
1999
October1st to 10thNight
19%5%244345%46%42%
2160
11th to 20thNight
18%9%35%434445%41%
2160
21st to endNight
23%8%25%7%33446%35%
2452
November1st to 10thNight
21%8%35%5%35%45%6%35%
2575
11th to 20thNight
21%9%36%5%3445%6%32%
2660
21st to endNight
21%10%46%6%3445%6%31%
2660
December1st to 10thNight
23%12%46%5%3445%5%30%
2663
11th to 20thNight
23%12%46%6%3445%6%28%
3531
21st to endNight
21%11%5%6%5%33346%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%411%16%12%1
1328
11th to 20thDay
59%5%9%14%12%1
1354
21st to endDay
43%411%22%17%2
1828
February1st to 10thDay
51%412%19%12%2
1620
11th to 20thDay
56%5%9%19%10%1
1581
21st to endDay
51%5%9%20%13%2
1354
March1st to 10thDay
56%48%21%9%1
1933
11th to 20thDay
53%410%19%10%3
1980
21st to endDay
54%48%19%11%4
2178
April1st to 10thDay
57%47%16%12%3
2121
11th to 20thDay
49%5%10%22%12%1
2307
21st to endDay
57%5%8%15%12%4
2340
May1st to 10thDay
57%47%19%12%1
2407
11th to 20thDay
53%5%8%22%11%1
2482
21st to endDay
46%7%14%23%9%1
2790
June1st to 10thDay
57%6%11%17%9%1
2700
11th to 20thDay
48%6%12%21%11%1
2700
21st to endDay
57%7%11%17%8%
2700
July1st to 10thDay
46%8%17%21%8%
2625
11th to 20thDay
42%8%16%24%10%
2619
21st to endDay
48%8%16%20%8%
2590
August1st to 10thDay
45%8%15%23%8%1
2314
11th to 20thDay
46%9%15%23%8%
2304
21st to endDay
40%7%15%27%11%
2552
September1st to 10thDay
41%8%15%23%14%
2160
11th to 20thDay
43%5%11%25%15%1
2036
21st to endDay
43%6%9%26%14%1
1960
October1st to 10thDay
43%5%11%28%12%1
1800
11th to 20thDay
48%6%14%23%9%
1800
21st to endDay
52%5%12%19%10%1
1902
November1st to 10thDay
51%5%11%21%10%1
1502
11th to 20thDay
52%5%13%17%12%1
1520
21st to endDay
54%7%14%16%8%
1520
December1st to 10thDay
56%5%14%17%7%1
1516
11th to 20thDay
59%410%16%9%1
1668
21st to endDay
52%5%12%17%11%3
2431
January1st to 10thNight
56%6%11%18%8%1
2838
11th to 20thNight
53%6%13%17%11%1
2822
21st to endNight
47%411%24%13%2
2753
February1st to 10thNight
50%5%12%17%13%3
2340
11th to 20thNight
56%5%9%17%11%2
2276
21st to endNight
52%6%7%19%14%2
1898
March1st to 10thNight
57%47%19%12%2
2026
11th to 20thNight
53%49%18%14%2
1980
21st to endNight
56%37%19%11%4
2178
April1st to 10thNight
58%48%15%12%3
1838
11th to 20thNight
50%5%9%21%13%2
1601
21st to endNight
56%5%8%14%14%2
1620
May1st to 10thNight
54%5%8%20%12%2
1553
11th to 20thNight
49%6%9%22%12%1
1417
21st to endNight
47%7%14%21%10%1
1500
June1st to 10thNight
56%5%10%19%9%1
1260
11th to 20thNight
48%7%11%25%9%2
1260
21st to endNight
58%5%12%17%7%1
1260
July1st to 10thNight
43%8%18%23%8%
1225
11th to 20thNight
42%8%17%23%9%1
1218
21st to endNight
48%7%17%20%8%
1463
August1st to 10thNight
44%9%15%25%7%
1600
11th to 20thNight
45%9%18%22%6%
1596
21st to endNight
40%8%16%25%11%
1803
September1st to 10thNight
39%5%13%30%12%1
1800
11th to 20thNight
38%5%13%28%15%1
1921
21st to endNight
39%6%11%28%14%1
1999
October1st to 10thNight
43%6%12%26%13%1
2160
11th to 20thNight
45%5%13%27%9%
2160
21st to endNight
51%5%13%21%10%
2452
November1st to 10thNight
50%5%13%21%10%1
2575
11th to 20thNight
53%5%12%19%10%1
2660
21st to endNight
54%7%13%18%8%
2660
December1st to 10thNight
57%5%12%19%7%
2663
11th to 20thNight
57%5%10%18%9%
3532
21st to endNight
55%414%18%8%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
31%12%39%16%2
180
11th to 20thDay
32%21%25%15%5%2
180
21st to endDay
16%18%38%21%6%
360
February1st to 10thDay
25%17%36%18%41
340
11th to 20thDay
23%25%34%13%41
336
21st to endDay
20%16%39%19%6%1
290
March1st to 10thDay
28%17%36%15%31
420
11th to 20thDay
25%18%30%19%6%2
420
21st to endDay
29%17%34%14%5%1
462
April1st to 10thDay
28%22%35%11%31
420
11th to 20thDay
27%19%31%18%31
412
21st to endDay
32%14%30%18%42
420
May1st to 10thDay
31%15%28%19%5%1
490
11th to 20thDay
26%14%29%20%9%2
624
21st to endDay
26%15%32%20%5%1
680
June1st to 10thDay
33%10%32%14%9%2
630
11th to 20thDay
24%13%29%25%7%1
630
21st to endDay
28%10%28%26%8%1
630
July1st to 10thDay
20%9%37%20%13%1
620
11th to 20thDay
14%7%39%27%12%2
618
21st to endDay
17%6%35%30%10%2
636
August1st to 10thDay
15%7%33%32%10%2
446
11th to 20thDay
17%9%28%31%14%1
439
21st to endDay
17%11%28%31%11%3
495
September1st to 10thDay
16%12%36%24%12%1
450
11th to 20thDay
24%13%32%22%7%2
450
21st to endDay
20%16%34%19%7%3
439
October1st to 10thDay
19%13%31%22%13%2
360
11th to 20thDay
24%16%30%20%9%1
360
21st to endDay
29%19%30%16%5%1
396
November1st to 10thDay
24%20%34%16%5%1
365
11th to 20thDay
28%18%32%15%6%1
370
21st to endDay
32%19%31%15%21
370
December1st to 10thDay
34%14%31%16%41
366
11th to 20thDay
29%23%36%9%3
180
21st to endDay
27%24%30%16%3
198
January1st to 10thNight
24%18%35%19%4
850
11th to 20thNight
25%17%34%19%5%
837
21st to endNight
18%17%37%22%6%
835
February1st to 10thNight
22%16%38%19%5%1
720
11th to 20thNight
27%18%35%14%5%1
703
21st to endNight
21%14%38%21%7%
592
March1st to 10thNight
26%13%36%23%3
720
11th to 20thNight
25%16%33%20%6%1
720
21st to endNight
24%14%34%22%5%1
792
April1st to 10thNight
33%14%26%23%4
578
11th to 20thNight
30%11%34%16%9%1
534
21st to endNight
31%11%27%22%8%1
540
May1st to 10thNight
32%10%28%24%7%
540
11th to 20thNight
27%7%31%25%9%1
532
21st to endNight
23%12%34%24%7%
532
June1st to 10thNight
33%5%27%28%7%
360
11th to 20thNight
24%5%27%34%11%
360
21st to endNight
30%6%27%27%10%1
360
July1st to 10thNight
19%7%39%24%11%1
350
11th to 20thNight
16%432%38%9%
348
21st to endNight
18%5%28%34%13%1
521
August1st to 10thNight
21%232%32%12%
538
11th to 20thNight
17%5%26%39%12%1
532
21st to endNight
16%6%31%31%13%2
594
September1st to 10thNight
20%8%37%26%8%1
540
11th to 20thNight
20%10%31%29%10%1
661
21st to endNight
20%10%36%25%8%
720
October1st to 10thNight
23%10%32%25%9%1
720
11th to 20thNight
23%11%37%21%8%1
720
21st to endNight
27%17%32%18%5%
792
November1st to 10thNight
28%17%32%18%5%1
821
11th to 20thNight
27%19%31%17%5%2
850
21st to endNight
28%20%29%18%4
850
December1st to 10thNight
31%16%35%14%4
850
11th to 20thNight
29%21%33%14%4
850
21st to endNight
29%19%30%17%41
935
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