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 2005-11-05 to

2017-09-12
.

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
25%
14750
14%
46686
5%
14709
34%
14709
17%
32756

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 15thNight
14%
750
14%
2685
2%
746
28%
746
12%
1862
January16th to endNight
21%
775
18%
2625
5%
775
38%
775
17%
1727
February1st to 15thNight
18%
704
12%
2286
4%
701
29%
701
17%
1598
February16th to endNight
18%
631
11%
2033
3%
631
28%
631
12%
1538
March1st to 15thNight
20%
720
16%
2010
5%
720
30%
720
17%
1489
March16th to endNight
23%
768
18%
2112
6%
768
33%
768
19%
1526
April1st to 15thNight
23%
563
13%
1762
7%
563
29%
563
16%
1282
April16th to endNight
27%
540
15%
1620
9%
540
32%
540
19%
1143
May1st to 15thNight
30%
540
10%
1515
7%
540
33%
540
18%
1109
May16th to endNight
28%
527
10%
1462
4%
526
34%
526
18%
1081
June1st to 15thNight
33%
360
7%
1260
6%
360
35%
360
14%
912
June16th to endNight
32%
360
5%
1260
3%
360
36%
360
15%
920
July1st to 15thNight
42%
340
10%
1190
8%
340
47%
340
23%
760
July16th to endNight
39%
461
9%
1347
6%
432
42%
432
19%
948
August1st to 15thNight
42%
539
9%
1608
7%
535
44%
535
20%
1129
August16th to endNight
41%
573
15%
1734
8%
573
46%
573
24%
1147
September1st to 15thNight
33%
550
15%
1787
9%
550
41%
550
23%
1132
September16th to endNight
32%
657
22%
1827
10%
657
41%
657
31%
1119
October1st to 15thNight
32%
660
20%
1980
8%
660
42%
660
24%
1287
October16th to endNight
18%
704
15%
2159
4%
704
29%
704
17%
1531
November1st to 15thNight
18%
728
15%
2442
6%
728
30%
728
15%
1725
November16th to endNight
21%
750
13%
2520
5%
750
31%
750
13%
1813
December1st to 15thNight
12%
750
13%
2582
2%
750
25%
750
12%
1849
December16th to endNight
14%
800
11%
2880
2%
800
26%
800
10%
2129

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
20%8%35%5%34446%33%
47983
Night
19%8%35%5%34446%33%
46846
TransparencyDay
51%5%12%19%9%
47661
Night
51%5%12%20%9%
46686
SeeingDay
24%10%30%23%9%1
7011
Night
24%10%32%23%7%
14750

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 15thDay
15%12%46%5%24446%33%
1253
16th to endDay
13%10%47%4235%5%438%
1595
February1st to 15thDay
11%10%38%5%35%6%6%5%33%
1575
16th to endDay
16%13%5%6%6%45%5%45%26%
1437
March1st to 15thDay
18%13%45%423335%32%
1938
16th to endDay
16%11%46%435%435%35%
2112
April1st to 15thDay
20%8%35%6%34446%31%
2183
16th to endDay
26%8%24423335%34%
2340
May1st to 15thDay
26%7%35%5%2435%5%31%
2437
16th to endDay
24%7%35%5%2445%7%29%
2663
June1st to 15thDay
27%7%345%2445%6%28%
2700
16th to endDay
26%6%25%6%3446%7%27%
2700
July1st to 15thDay
15%435%6%35%5%6%8%34%
2700
16th to endDay
18%6%25%6%36%46%8%30%
2711
August1st to 15thDay
17%6%25%6%35%5%5%7%33%
2340
16th to endDay
14%5%245%35%5%5%8%39%
2468
September1st to 15thDay
17%6%26%6%24445%39%
2091
16th to endDay
17%413323335%47%
1802
October1st to 15thDay
18%6%26%423446%40%
1650
16th to endDay
26%6%245%3343434%
1711
November1st to 15thDay
24%10%245%24447%30%
1416
16th to endDay
17%10%46%5%25%45%5%31%
1440
December1st to 15thDay
23%10%36%324336%31%
1377
16th to endDay
23%11%5%6%423346%27%
1344
January1st to 15thNight
15%10%37%6%3445%6%33%
2685
16th to endNight
15%8%45%434446%38%
2625
February1st to 15thNight
15%12%35%5%35%36%6%32%
2285
16th to endNight
17%14%46%6%35%445%26%
2033
March1st to 15thNight
19%10%45%5%35%5%45%31%
1998
16th to endNight
17%10%47%5%2433437%
2112
April1st to 15thNight
25%9%25%5%22446%30%
1762
16th to endNight
24%10%25%323336%33%
1620
May1st to 15thNight
24%9%36%413446%31%
1515
16th to endNight
21%7%25%6%25%5%5%7%29%
1460
June1st to 15thNight
26%7%45%43444429%
1260
16th to endNight
24%7%246%45%5%5%6%28%
1260
July1st to 15thNight
13%7%25%5%35%5%6%7%38%
1260
16th to endNight
17%6%26%6%35%5%6%8%30%
1440
August1st to 15thNight
19%5%245%35%5%5%6%34%
1620
16th to endNight
13%6%25%5%25%45%8%39%
1734
September1st to 15thNight
18%5%24324347%42%
1787
16th to endNight
16%313313445%50%
1827
October1st to 15thNight
19%5%233345%46%41%
1980
16th to endNight
25%7%245%23345%35%
2159
November1st to 15thNight
24%8%35%424346%33%
2442
16th to endNight
19%9%46%6%34445%31%
2520
December1st to 15thNight
22%11%35%434345%31%
2582
16th to endNight
24%10%45%5%2335%6%26%
2880

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 15thDay
52%413%17%11%
1254
16th to endDay
48%410%19%17%
1595
February1st to 15thDay
50%413%20%9%1
1578
16th to endDay
59%5%8%18%8%
1437
March1st to 15thDay
55%38%19%10%1
1949
16th to endDay
53%47%21%10%2
2112
April1st to 15thDay
54%48%17%12%2
2183
16th to endDay
52%48%17%14%2
2340
May1st to 15thDay
56%37%20%9%1
2437
16th to endDay
54%6%12%19%6%
2667
June1st to 15thDay
56%412%16%8%
2700
16th to endDay
56%6%13%16%7%
2700
July1st to 15thDay
43%7%16%21%9%
2541
16th to endDay
49%7%16%19%7%
2542
August1st to 15thDay
48%7%13%22%7%
2327
16th to endDay
42%6%17%26%7%
2468
September1st to 15thDay
45%5%13%21%12%
2091
16th to endDay
39%411%27%15%1
1802
October1st to 15thDay
45%412%26%9%1
1650
16th to endDay
52%5%12%19%9%
1711
November1st to 15thDay
54%5%14%13%11%
1416
16th to endDay
53%6%15%16%7%
1440
December1st to 15thDay
56%416%16%5%
1377
16th to endDay
59%5%10%15%9%
1344
January1st to 15thNight
52%5%12%18%10%1
2685
16th to endNight
48%311%23%11%
2625
February1st to 15thNight
51%5%12%19%11%
2286
16th to endNight
59%5%8%15%10%1
2033
March1st to 15thNight
55%38%18%11%1
2010
16th to endNight
53%27%20%13%2
2112
April1st to 15thNight
54%49%16%12%3
1762
16th to endNight
51%48%16%15%2
1620
May1st to 15thNight
54%410%20%8%1
1515
16th to endNight
53%6%13%17%8%
1462
June1st to 15thNight
56%5%10%19%8%1
1260
16th to endNight
55%6%13%16%7%
1260
July1st to 15thNight
41%7%16%26%7%
1190
16th to endNight
49%7%17%16%8%
1347
August1st to 15thNight
47%8%15%21%7%
1608
16th to endNight
42%7%17%24%7%
1734
September1st to 15thNight
42%412%27%12%
1787
16th to endNight
35%413%30%14%
1827
October1st to 15thNight
42%413%27%10%
1980
16th to endNight
51%411%22%9%
2159
November1st to 15thNight
53%413%19%9%
2442
16th to endNight
53%6%14%19%5%
2520
December1st to 15thNight
55%412%21%6%
2582
16th to endNight
59%410%17%8%
2880

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 15thDay
21%23%35%16%3
60
16th to endDay
15%13%39%25%5%
168
February1st to 15thDay
17%12%36%25%7%
236
16th to endDay
25%12%30%24%5%2
215
March1st to 15thDay
24%17%30%20%5%1
270
16th to endDay
24%11%33%19%8%1
288
April1st to 15thDay
27%12%34%18%5%1
270
16th to endDay
27%13%28%22%5%3
270
May1st to 15thDay
32%9%25%19%9%2
393
16th to endDay
27%11%28%22%8%1
519
June1st to 15thDay
33%8%27%19%9%1
495
16th to endDay
27%6%29%25%11%
495
July1st to 15thDay
16%7%34%24%15%1
475
16th to endDay
20%330%31%13%1
481
August1st to 15thDay
15%426%35%14%4
313
16th to endDay
17%6%26%31%16%1
332
September1st to 15thDay
21%9%34%23%10%1
299
16th to endDay
18%9%33%25%9%3
251
October1st to 15thDay
19%12%28%22%13%4
225
16th to endDay
32%17%29%14%5%2
240
November1st to 15thDay
31%13%31%13%8%2
235
16th to endDay
26%15%30%21%41
240
December1st to 15thDay
32%12%34%14%5%
177
16th to endDay
28%26%39%6%
64
January1st to 15thNight
19%17%39%18%4
750
16th to endNight
20%14%35%23%5%
775
February1st to 15thNight
21%11%40%19%6%
704
16th to endNight
25%12%32%20%6%
631
March1st to 15thNight
23%12%36%21%4
720
16th to endNight
22%13%33%23%5%1
768
April1st to 15thNight
31%11%26%23%7%
563
16th to endNight
30%9%27%22%9%
540
May1st to 15thNight
29%8%26%23%11%
540
16th to endNight
25%6%33%25%9%
527
June1st to 15thNight
30%323%34%8%
360
16th to endNight
25%428%30%10%
360
July1st to 15thNight
15%334%31%14%
340
16th to endNight
20%228%34%13%
461
August1st to 15thNight
20%324%35%14%
539
16th to endNight
17%331%32%13%1
573
September1st to 15thNight
22%7%33%27%9%
550
16th to endNight
17%9%37%26%8%
657
October1st to 15thNight
22%8%34%23%9%1
660
16th to endNight
27%13%34%17%5%
704
November1st to 15thNight
28%11%36%15%6%1
728
16th to endNight
24%18%29%19%6%1
750
December1st to 15thNight
28%17%36%14%3
750
16th to endNight
31%16%30%15%41
800
Page generated at 2017-09-13 08:39:10. Version ac04

Copyright 2017 A. Danko


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