Kentville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kentville clear sky chart from 2005-11-05 to 2017-12-01.

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
21%
15347
10%
47548
5%
15302
28%
15302
12%
36260

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
9%
750
6%
2572
1%
746
15%
746
4%
2150
January16th to endNight
10%
769
7%
2505
1%
769
17%
769
6%
2118
February1st to 15thNight
9%
704
4%
2286
1%
701
14%
701
4%
1981
February16th to endNight
15%
631
7%
2039
2%
631
22%
631
8%
1644
March1st to 15thNight
15%
720
13%
1980
4%
720
23%
720
12%
1555
March16th to endNight
16%
768
13%
2112
3%
768
24%
768
13%
1613
April1st to 15thNight
15%
557
12%
1805
5%
557
24%
557
11%
1362
April16th to endNight
21%
540
13%
1620
5%
540
27%
540
15%
1180
May1st to 15thNight
24%
540
9%
1537
4%
540
29%
540
14%
1184
May16th to endNight
23%
561
10%
1496
3%
560
29%
560
19%
1114
June1st to 15thNight
24%
479
7%
1379
3%
479
27%
479
13%
1058
June16th to endNight
33%
360
9%
1260
5%
360
39%
360
15%
894
July1st to 15thNight
41%
365
10%
1215
6%
365
46%
365
25%
755
July16th to endNight
39%
565
9%
1479
6%
532
40%
532
20%
1080
August1st to 15thNight
42%
539
13%
1608
9%
535
45%
535
21%
1114
August16th to endNight
40%
573
17%
1769
9%
573
47%
573
24%
1159
September1st to 15thNight
37%
543
18%
1803
12%
543
46%
543
23%
1137
September16th to endNight
34%
717
21%
2007
11%
717
42%
717
25%
1325
October1st to 15thNight
27%
720
17%
2160
8%
720
34%
720
21%
1447
October16th to endNight
19%
768
14%
2304
5%
768
27%
768
13%
1682
November1st to 15thNight
21%
799
11%
2631
7%
799
26%
799
11%
2010
November16th to endNight
16%
825
8%
2730
4%
825
22%
825
8%
2177
December1st to 15thNight
9%
754
6%
2531
0%
754
16%
754
5%
2126
December16th to endNight
8%
800
5%
2720
0%
800
13%
800
3%
2395

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%11%47%6%34346%28%
48855
Night
18%11%48%6%34446%26%
47718
TransparencyDay
56%5%10%18%8%
48543
Night
58%6%10%16%6%
47548
SeeingDay
27%15%29%18%7%1
7612
Night
26%15%29%20%6%
15347

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
14%17%7%14%11%5%434413%
1357
16th to endDay
13%14%7%10%13%6%7%33414%
1716
February1st to 15thDay
16%14%7%14%13%6%5%33411%
1575
16th to endDay
12%16%9%12%6%34335%22%
1433
March1st to 15thDay
14%14%6%9%9%3433326%
1969
16th to endDay
15%13%7%9%5%2423330%
2112
April1st to 15thDay
18%13%48%5%34446%26%
2141
16th to endDay
22%10%26%423346%32%
2340
May1st to 15thDay
26%9%46%434445%27%
2413
16th to endDay
23%9%45%5%2435%6%28%
2618
June1st to 15thDay
28%9%35%6%34446%24%
2589
16th to endDay
22%8%36%5%335%6%6%27%
2700
July1st to 15thDay
15%7%25%43445%8%38%
2658
16th to endDay
19%7%36%5%345%5%7%29%
2585
August1st to 15thDay
18%6%25%5%245%5%6%36%
2340
16th to endDay
13%6%2342335%8%45%
2432
September1st to 15thDay
19%7%24423346%41%
2154
16th to endDay
16%6%15%423247%45%
1953
October1st to 15thDay
19%7%14433448%38%
1800
16th to endDay
21%11%36%5%2435%7%28%
1920
November1st to 15thDay
21%15%46%5%34335%26%
1553
16th to endDay
18%16%6%10%6%3443420%
1560
December1st to 15thDay
21%14%7%13%8%3442414%
1443
16th to endDay
22%18%9%12%9%2312313%
1494
January1st to 15thNight
15%14%7%13%9%5%444415%
2572
16th to endNight
15%12%6%11%10%6%6%445%14%
2505
February1st to 15thNight
17%13%7%12%12%6%434412%
2285
16th to endNight
13%16%6%11%7%45%34321%
2039
March1st to 15thNight
17%12%47%8%3443427%
1968
16th to endNight
17%13%7%7%5%23335%29%
2112
April1st to 15thNight
20%13%47%6%2443427%
1805
16th to endNight
22%9%35%5%23445%32%
1620
May1st to 15thNight
23%10%36%5%35%447%26%
1537
16th to endNight
18%8%37%5%2446%8%29%
1494
June1st to 15thNight
27%7%35%5%34347%26%
1379
16th to endNight
20%7%346%35%5%48%30%
1260
July1st to 15thNight
13%5%2443447%11%38%
1287
16th to endNight
16%7%35%5%36%5%7%7%29%
1580
August1st to 15thNight
19%7%2442445%7%37%
1620
16th to endNight
14%5%2443445%8%41%
1769
September1st to 15thNight
16%5%2432445%8%42%
1803
16th to endNight
14%6%35%5%3435%7%41%
2007
October1st to 15thNight
18%6%144245%5%7%38%
2160
16th to endNight
22%10%36%424446%31%
2304
November1st to 15thNight
21%12%47%6%3444426%
2631
16th to endNight
18%15%6%8%6%35%435%22%
2730
December1st to 15thNight
20%14%7%11%9%3334416%
2531
16th to endNight
23%17%8%11%9%3333412%
2720

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
75%5%9%8%1
1358
16th to endDay
73%6%7%8%3
1716
February1st to 15thDay
75%6%7%7%2
1578
16th to endDay
65%5%10%13%4
1433
March1st to 15thDay
63%48%14%8%
1980
16th to endDay
59%47%19%8%1
2112
April1st to 15thDay
57%5%7%15%11%1
2141
16th to endDay
53%38%19%12%1
2340
May1st to 15thDay
57%5%8%17%9%
2413
16th to endDay
56%6%10%18%6%
2622
June1st to 15thDay
60%5%9%16%6%
2589
16th to endDay
54%7%11%16%8%
2700
July1st to 15thDay
41%6%15%22%12%
2502
16th to endDay
52%5%12%22%6%
2423
August1st to 15thDay
46%7%11%21%11%
2327
16th to endDay
37%6%14%29%12%
2432
September1st to 15thDay
44%412%24%12%1
2154
16th to endDay
40%310%28%15%1
1953
October1st to 15thDay
45%5%11%26%10%
1800
16th to endDay
56%411%20%7%
1920
November1st to 15thDay
61%412%13%7%
1553
16th to endDay
67%6%10%10%3
1560
December1st to 15thDay
74%5%7%10%1
1443
16th to endDay
78%48%5%3
1494
January1st to 15thNight
70%6%10%10%2
2572
16th to endNight
71%6%9%10%2
2505
February1st to 15thNight
74%6%8%8%2
2286
16th to endNight
65%5%11%11%5%
2039
March1st to 15thNight
59%5%9%15%7%
1980
16th to endNight
57%49%17%9%
2112
April1st to 15thNight
60%47%14%11%2
1805
16th to endNight
53%6%9%15%13%1
1620
May1st to 15thNight
58%5%10%18%5%1
1537
16th to endNight
52%6%13%19%6%1
1496
June1st to 15thNight
58%6%11%17%5%
1379
16th to endNight
51%6%12%19%7%
1260
July1st to 15thNight
36%9%20%23%9%
1215
16th to endNight
48%8%15%19%6%
1479
August1st to 15thNight
45%8%12%24%8%
1608
16th to endNight
40%8%14%26%10%
1769
September1st to 15thNight
38%8%10%29%11%
1803
16th to endNight
41%5%11%27%12%
2007
October1st to 15thNight
44%6%12%25%10%
2160
16th to endNight
53%5%11%19%9%
2304
November1st to 15thNight
58%7%11%15%6%
2631
16th to endNight
64%6%12%12%4
2730
December1st to 15thNight
71%6%9%11%2
2531
16th to endNight
76%6%5%8%2
2720

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
23%25%37%12%
164
16th to endDay
25%26%32%12%2
256
February1st to 15thDay
24%25%33%13%2
236
16th to endDay
28%19%32%14%5%
214
March1st to 15thDay
25%25%33%10%4
270
16th to endDay
29%22%27%13%5%1
288
April1st to 15thDay
30%20%32%14%1
270
16th to endDay
24%19%31%16%7%
270
May1st to 15thDay
33%15%25%18%41
369
16th to endDay
31%13%29%17%5%
519
June1st to 15thDay
35%11%25%19%7%
495
16th to endDay
26%9%31%23%7%2
495
July1st to 15thDay
19%5%33%27%13%1
475
16th to endDay
23%6%31%23%13%1
446
August1st to 15thDay
21%5%30%28%11%2
313
16th to endDay
18%8%30%24%15%3
332
September1st to 15thDay
25%9%33%20%10%
315
16th to endDay
20%9%28%25%12%2
307
October1st to 15thDay
24%12%30%21%6%4
270
16th to endDay
28%26%23%14%7%
288
November1st to 15thDay
32%15%26%18%5%2
280
16th to endDay
29%22%28%13%5%
285
December1st to 15thDay
36%22%26%12%2
241
16th to endDay
37%27%22%9%2
214
January1st to 15thNight
27%23%32%13%2
750
16th to endNight
27%24%31%12%2
769
February1st to 15thNight
31%23%29%14%1
704
16th to endNight
28%20%29%15%4
631
March1st to 15thNight
26%20%32%16%4
720
16th to endNight
27%20%30%15%5%
768
April1st to 15thNight
30%16%32%16%4
557
16th to endNight
27%13%33%19%4
540
May1st to 15thNight
30%10%28%21%7%
540
16th to endNight
22%11%35%23%5%
561
June1st to 15thNight
30%10%27%25%6%
479
16th to endNight
23%7%28%32%7%1
360
July1st to 15thNight
16%330%39%9%
365
16th to endNight
19%5%28%36%9%
565
August1st to 15thNight
21%423%36%14%
539
16th to endNight
17%6%29%31%13%1
573
September1st to 15thNight
19%6%31%31%10%
543
16th to endNight
18%10%31%29%9%1
717
October1st to 15thNight
22%13%34%20%8%1
720
16th to endNight
31%19%26%18%4
768
November1st to 15thNight
30%16%27%18%6%
799
16th to endNight
30%20%26%18%4
825
December1st to 15thNight
34%23%27%12%2
754
16th to endNight
36%22%25%11%3
800
Page generated at 2017-12-02 10:14:20. Version ac04

Copyright 2017 A. Danko


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