Musquodoboit Harbour
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Musquodoboit Harbour clear sky chart from 2005-11-05 to 2017-08-12.

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
22%
15227
11%
46527
5%
15182
28%
15182
14%
34731

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
12%
750
9%
2506
2%
746
20%
746
8%
1933
January16th to endNight
12%
776
11%
2544
3%
776
23%
776
10%
1926
February1st to 15thNight
14%
704
7%
2286
2%
701
20%
701
9%
1794
February16th to endNight
15%
631
8%
2012
2%
631
22%
631
9%
1572
March1st to 15thNight
18%
720
13%
2011
4%
720
26%
720
14%
1531
March16th to endNight
20%
753
13%
2097
4%
753
28%
753
15%
1567
April1st to 15thNight
16%
539
12%
1796
4%
539
25%
539
12%
1335
April16th to endNight
20%
540
13%
1666
6%
540
27%
540
15%
1222
May1st to 15thNight
22%
540
9%
1497
4%
540
26%
540
13%
1183
May16th to endNight
22%
561
9%
1496
3%
560
28%
560
15%
1146
June1st to 15thNight
18%
540
6%
1440
2%
540
21%
540
13%
1169
June16th to endNight
25%
540
6%
1440
2%
540
28%
540
16%
1123
July1st to 15thNight
36%
510
7%
1360
4%
510
38%
510
20%
1015
July16th to endNight
35%
565
8%
1436
7%
532
36%
532
17%
1117
August1st to 15thNight
39%
528
11%
1575
8%
524
41%
524
18%
1150
August16th to endNight
40%
525
14%
1656
10%
525
43%
525
20%
1132
September1st to 15thNight
33%
495
16%
1650
9%
495
41%
495
21%
1090
September16th to endNight
35%
613
22%
1825
14%
613
42%
613
24%
1176
October1st to 15thNight
29%
660
18%
1980
8%
660
38%
660
22%
1336
October16th to endNight
17%
707
13%
2125
4%
707
24%
707
15%
1541
November1st to 15thNight
25%
730
12%
2401
8%
730
30%
730
14%
1755
November16th to endNight
21%
750
12%
2520
5%
750
30%
750
12%
1847
December1st to 15thNight
12%
750
10%
2520
2%
750
21%
750
8%
1962
December16th to endNight
12%
800
9%
2688
2%
800
21%
800
8%
2109

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
23%9%46%5%34446%27%
47450
Night
22%9%36%5%34446%28%
46701
TransparencyDay
57%6%11%16%7%
47142
Night
55%6%12%17%7%
46527
SeeingDay
30%15%29%17%6%1
7426
Night
28%14%30%20%5%
15227

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
18%12%5%6%7%36%6%46%21%
1432
16th to endDay
18%12%5%7%5%36%5%5%8%23%
1677
February1st to 15thDay
18%13%5%8%7%45%5%5%5%21%
1575
16th to endDay
14%16%7%8%6%34347%23%
1461
March1st to 15thDay
20%12%48%5%35%33426%
1936
16th to endDay
18%12%5%8%5%3433429%
2127
April1st to 15thDay
25%12%47%5%24445%24%
2153
16th to endDay
26%9%35%433346%28%
2292
May1st to 15thDay
29%9%35%6%23445%24%
2455
16th to endDay
26%10%45%5%33346%26%
2618
June1st to 15thDay
31%9%36%5%23446%21%
2520
16th to endDay
27%9%45%5%24346%25%
2520
July1st to 15thDay
22%8%3442345%9%30%
2520
16th to endDay
25%9%46%43445%6%24%
2633
August1st to 15thDay
21%7%26%5%3445%7%29%
2288
16th to endDay
17%7%25%3245%5%7%38%
2193
September1st to 15thDay
23%7%245%33347%34%
1980
16th to endDay
18%425%423448%41%
1802
October1st to 15thDay
21%5%26%42345%6%35%
1650
16th to endDay
24%7%47%7%24445%27%
1746
November1st to 15thDay
26%10%45%5%33445%26%
1456
16th to endDay
22%9%47%6%25%45%6%24%
1440
December1st to 15thDay
27%8%47%6%34436%22%
1440
16th to endDay
24%12%48%6%34335%21%
1536
January1st to 15thNight
18%10%38%6%36%6%5%7%23%
2506
16th to endNight
19%10%37%6%35%45%7%25%
2544
February1st to 15thNight
19%10%5%8%7%5%6%45%6%21%
2285
16th to endNight
15%12%6%9%8%4445%5%23%
2012
March1st to 15thNight
22%10%35%5%35%5%5%6%27%
1999
16th to endNight
20%9%37%6%24445%30%
2097
April1st to 15thNight
25%11%35%5%2444429%
1796
16th to endNight
25%8%45%5%23446%30%
1666
May1st to 15thNight
31%8%35%434446%23%
1497
16th to endNight
23%8%35%5%345%47%27%
1494
June1st to 15thNight
33%10%34424335%23%
1440
16th to endNight
28%8%36%424335%28%
1440
July1st to 15thNight
19%8%26%5%3346%9%29%
1440
16th to endNight
24%10%35%5%25%45%7%26%
1533
August1st to 15thNight
20%9%25%42445%6%32%
1587
16th to endNight
18%6%26%5%2445%6%38%
1656
September1st to 15thNight
19%5%25%42445%6%40%
1650
16th to endNight
21%6%24313345%43%
1825
October1st to 15thNight
21%5%25%324346%39%
1980
16th to endNight
25%7%25%434436%32%
2125
November1st to 15thNight
25%8%36%5%2445%6%28%
2401
16th to endNight
23%6%35%5%25%347%30%
2520
December1st to 15thNight
25%10%47%5%35%35%5%24%
2520
16th to endNight
24%11%47%5%35%45%5%21%
2688

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
61%8%13%13%3
1433
16th to endDay
57%6%11%16%7%
1677
February1st to 15thDay
63%6%10%12%5%
1578
16th to endDay
61%5%10%14%6%1
1461
March1st to 15thDay
61%310%14%8%1
1947
16th to endDay
58%311%16%8%
2127
April1st to 15thDay
62%47%13%10%1
2153
16th to endDay
56%5%9%16%10%1
2292
May1st to 15thDay
61%5%9%16%6%
2455
16th to endDay
60%5%11%16%6%
2622
June1st to 15thDay
64%6%10%11%5%
2520
16th to endDay
59%7%11%14%6%
2520
July1st to 15thDay
48%8%17%17%8%
2372
16th to endDay
59%8%11%15%4
2467
August1st to 15thDay
52%7%16%17%6%
2275
16th to endDay
41%7%19%23%7%
2193
September1st to 15thDay
49%5%11%21%10%1
1980
16th to endDay
41%5%11%27%13%
1802
October1st to 15thDay
48%5%12%22%11%
1650
16th to endDay
57%414%17%5%
1746
November1st to 15thDay
59%5%10%15%7%
1456
16th to endDay
59%8%12%12%6%
1440
December1st to 15thDay
63%7%11%15%2
1440
16th to endDay
66%411%11%6%
1536
January1st to 15thNight
58%9%13%15%3
2506
16th to endNight
57%6%12%18%4
2544
February1st to 15thNight
62%6%12%12%5%
2286
16th to endNight
60%7%12%13%5%
2012
March1st to 15thNight
55%6%12%16%8%
2011
16th to endNight
55%5%10%18%8%1
2097
April1st to 15thNight
57%5%9%15%9%1
1796
16th to endNight
54%5%10%16%11%1
1666
May1st to 15thNight
60%6%8%17%5%
1497
16th to endNight
55%6%12%17%5%1
1496
June1st to 15thNight
64%5%9%14%5%
1440
16th to endNight
58%6%10%15%8%
1440
July1st to 15thNight
47%10%15%17%8%
1360
16th to endNight
55%8%12%15%6%
1436
August1st to 15thNight
51%7%13%21%5%
1575
16th to endNight
45%8%14%22%9%
1656
September1st to 15thNight
43%7%13%23%10%1
1650
16th to endNight
42%411%28%13%
1825
October1st to 15thNight
46%412%25%10%
1980
16th to endNight
53%5%12%20%8%
2125
November1st to 15thNight
55%5%13%17%7%
2401
16th to endNight
54%7%14%16%6%
2520
December1st to 15thNight
61%7%11%16%4
2520
16th to endNight
63%6%10%15%4
2688

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
27%21%32%17%1
240
16th to endDay
28%19%38%10%3
256
February1st to 15thDay
29%19%31%16%2
236
16th to endDay
26%21%32%15%3
212
March1st to 15thDay
26%25%29%13%4
265
16th to endDay
31%22%26%13%31
288
April1st to 15thDay
34%22%29%8%4
270
16th to endDay
24%21%33%15%41
270
May1st to 15thDay
39%11%26%15%5%2
411
16th to endDay
33%12%31%17%4
519
June1st to 15thDay
35%13%24%20%5%
495
16th to endDay
33%12%27%18%5%2
495
July1st to 15thDay
26%9%28%23%11%
475
16th to endDay
34%7%24%23%9%1
494
August1st to 15thDay
25%9%31%19%11%3
297
16th to endDay
23%11%27%22%12%3
268
September1st to 15thDay
25%11%28%22%10%
255
16th to endDay
20%11%30%23%11%3
244
October1st to 15thDay
27%12%31%14%10%3
225
16th to endDay
32%18%27%11%7%2
240
November1st to 15thDay
26%16%28%17%7%2
235
16th to endDay
29%18%27%16%6%1
240
December1st to 15thDay
36%20%26%14%2
240
16th to endDay
30%22%31%12%1
256
January1st to 15thNight
26%21%34%15%1
750
16th to endNight
27%21%35%14%2
776
February1st to 15thNight
25%20%33%17%1
704
16th to endNight
25%21%31%17%4
631
March1st to 15thNight
27%19%30%18%3
720
16th to endNight
27%18%28%19%5%
753
April1st to 15thNight
31%14%32%16%4
539
16th to endNight
31%14%31%19%3
540
May1st to 15thNight
34%11%28%17%7%1
540
16th to endNight
25%12%35%21%5%
561
June1st to 15thNight
37%8%30%18%3
540
16th to endNight
29%8%32%23%5%
540
July1st to 15thNight
21%6%29%34%8%
510
16th to endNight
26%7%26%29%10%
565
August1st to 15thNight
24%5%24%31%13%
528
16th to endNight
21%6%25%35%10%
525
September1st to 15thNight
21%9%30%27%11%
495
16th to endNight
24%9%27%27%9%1
613
October1st to 15thNight
25%10%30%23%8%1
660
16th to endNight
29%15%33%15%4
707
November1st to 15thNight
29%11%29%21%6%1
730
16th to endNight
28%17%28%19%5%
750
December1st to 15thNight
33%18%31%13%3
750
16th to endNight
32%21%29%14%1
800
Page generated at 2017-08-13 15:16:37. Version ac04

Copyright 2017 A. Danko


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