Blomidon Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Blomidon Provincial Park clear sky chart from 2005-11-05 to 2017-09-17.

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%
15005
10%
46601
5%
14960
30%
14960
13%
35668

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
11%
750
7%
2576
2%
746
18%
746
5%
2153
January16th to endNight
12%
771
8%
2517
2%
771
19%
771
6%
2090
February1st to 15thNight
12%
704
5%
2286
2%
701
16%
701
6%
1957
February16th to endNight
18%
631
7%
2042
2%
631
24%
631
9%
1613
March1st to 15thNight
20%
719
13%
1980
5%
719
28%
719
14%
1532
March16th to endNight
20%
768
13%
2112
5%
768
27%
768
16%
1605
April1st to 15thNight
23%
551
13%
1802
7%
551
30%
551
13%
1346
April16th to endNight
27%
540
13%
1620
7%
540
31%
540
17%
1183
May1st to 15thNight
30%
540
9%
1527
5%
540
33%
540
14%
1193
May16th to endNight
31%
561
10%
1496
3%
560
36%
560
19%
1118
June1st to 15thNight
32%
477
6%
1377
4%
477
34%
477
14%
1084
June16th to endNight
39%
360
8%
1260
7%
360
41%
360
15%
914
July1st to 15thNight
48%
363
8%
1213
6%
363
51%
363
22%
798
July16th to endNight
40%
565
8%
1468
7%
532
41%
532
18%
1103
August1st to 15thNight
46%
539
11%
1608
10%
535
47%
535
21%
1148
August16th to endNight
46%
573
15%
1770
9%
573
51%
573
22%
1204
September1st to 15thNight
41%
540
16%
1800
13%
540
47%
540
24%
1144
September16th to endNight
38%
662
20%
1860
12%
662
44%
662
25%
1236
October1st to 15thNight
29%
660
16%
1980
8%
660
36%
660
20%
1357
October16th to endNight
19%
704
13%
2112
4%
704
27%
704
13%
1591
November1st to 15thNight
23%
727
11%
2428
6%
727
29%
727
13%
1832
November16th to endNight
18%
750
8%
2520
4%
750
24%
750
8%
2031
December1st to 15thNight
10%
750
8%
2520
1%
750
17%
750
6%
2096
December16th to endNight
9%
800
6%
2727
1%
800
15%
800
4%
2340

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
18%9%47%6%34446%29%
48162
Night
19%10%47%6%35%446%25%
46770
TransparencyDay
55%6%11%18%8%
47849
Night
58%6%10%16%6%
46601
SeeingDay
25%9%25%25%11%1
7392
Night
25%12%29%23%8%
15006

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
16%16%6%9%8%5%5%5%46%14%
1354
16th to endDay
15%12%5%8%8%6%8%5%5%6%15%
1706
February1st to 15thDay
17%12%5%11%9%6%7%6%46%13%
1575
16th to endDay
12%11%6%12%8%445%46%22%
1428
March1st to 15thDay
15%13%47%7%44445%26%
1969
16th to endDay
16%10%47%7%44336%30%
2112
April1st to 15thDay
18%11%45%5%35%45%6%28%
2144
16th to endDay
20%9%36%5%35%45%5%31%
2340
May1st to 15thDay
21%10%47%5%2345%6%27%
2425
16th to endDay
20%9%37%5%3445%7%29%
2618
June1st to 15thDay
24%8%36%5%35%5%45%26%
2592
16th to endDay
21%7%46%5%35%46%7%28%
2700
July1st to 15thDay
16%6%25%42445%9%38%
2661
16th to endDay
19%7%46%6%245%6%7%30%
2599
August1st to 15thDay
15%7%36%4245%5%8%37%
2340
16th to endDay
12%6%2442335%8%46%
2430
September1st to 15thDay
15%6%35%5%2435%6%41%
2160
16th to endDay
13%7%25%422246%47%
1804
October1st to 15thDay
18%9%34423346%39%
1650
16th to endDay
23%9%36%5%345%46%27%
1760
November1st to 15thDay
22%12%36%5%34326%28%
1426
16th to endDay
19%13%7%10%8%35%33418%
1440
December1st to 15thDay
25%11%6%10%7%35%5%35%16%
1440
16th to endDay
24%14%7%10%8%4433414%
1489
January1st to 15thNight
18%13%7%10%8%45%5%45%16%
2576
16th to endNight
16%13%48%7%6%8%6%5%5%16%
2517
February1st to 15thNight
17%12%6%10%9%5%7%6%4414%
2285
16th to endNight
14%14%6%11%7%35%43422%
2042
March1st to 15thNight
19%10%5%7%6%45%445%27%
1968
16th to endNight
18%13%47%7%23435%29%
2112
April1st to 15thNight
23%12%46%5%3444426%
1802
16th to endNight
21%9%36%5%34346%30%
1620
May1st to 15thNight
25%8%46%6%34346%25%
1527
16th to endNight
18%9%47%5%3445%7%28%
1494
June1st to 15thNight
25%10%45%6%35%346%23%
1377
16th to endNight
20%8%37%5%45%5%47%28%
1260
July1st to 15thNight
13%8%35%435%5%6%11%31%
1285
16th to endNight
17%9%47%6%46%46%9%23%
1568
August1st to 15thNight
18%8%26%5%25%5%5%6%31%
1620
16th to endNight
12%6%37%5%35%5%6%7%36%
1770
September1st to 15thNight
15%4345%3445%8%39%
1800
16th to endNight
14%6%36%6%24346%43%
1860
October1st to 15thNight
18%6%25%5%345%45%37%
1980
16th to endNight
24%10%36%433445%28%
2112
November1st to 15thNight
22%9%36%5%35%5%5%6%26%
2428
16th to endNight
21%11%5%8%7%45%435%21%
2520
December1st to 15thNight
24%11%6%9%8%35%35%6%16%
2520
16th to endNight
25%13%6%9%7%35%435%14%
2727

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
71%7%10%8%2
1355
16th to endDay
69%6%8%10%4
1706
February1st to 15thDay
71%6%10%7%3
1578
16th to endDay
61%7%11%12%5%
1428
March1st to 15thDay
60%6%9%15%8%
1980
16th to endDay
56%5%8%18%9%1
2112
April1st to 15thDay
56%6%9%15%11%1
2144
16th to endDay
53%410%19%11%1
2340
May1st to 15thDay
56%5%8%19%8%
2425
16th to endDay
54%7%11%18%6%1
2622
June1st to 15thDay
59%7%9%16%6%
2592
16th to endDay
53%7%12%17%8%
2700
July1st to 15thDay
40%7%15%22%11%
2505
16th to endDay
51%7%12%22%6%
2436
August1st to 15thDay
44%8%13%22%10%
2327
16th to endDay
35%7%16%29%10%
2430
September1st to 15thDay
43%7%12%23%12%
2160
16th to endDay
38%410%30%14%1
1804
October1st to 15thDay
45%6%11%25%11%
1650
16th to endDay
58%5%11%18%6%
1760
November1st to 15thDay
60%411%14%8%
1426
16th to endDay
69%6%10%9%4
1440
December1st to 15thDay
71%6%8%11%2
1440
16th to endDay
74%6%8%7%4
1489
January1st to 15thNight
70%5%9%10%2
2576
16th to endNight
69%6%8%12%3
2517
February1st to 15thNight
72%6%8%9%3
2286
16th to endNight
63%6%11%11%5%
2042
March1st to 15thNight
59%49%16%8%
1980
16th to endNight
57%48%18%9%
2112
April1st to 15thNight
58%47%15%11%2
1802
16th to endNight
54%5%10%15%12%1
1620
May1st to 15thNight
59%6%9%17%5%
1527
16th to endNight
52%7%12%19%6%1
1496
June1st to 15thNight
60%7%9%16%5%1
1377
16th to endNight
53%7%11%21%5%
1260
July1st to 15thNight
39%11%18%21%8%
1213
16th to endNight
52%8%13%18%6%
1468
August1st to 15thNight
48%7%12%23%7%
1608
16th to endNight
41%10%15%24%7%
1770
September1st to 15thNight
40%7%11%29%11%
1800
16th to endNight
42%5%11%29%11%
1860
October1st to 15thNight
47%5%12%23%9%
1980
16th to endNight
58%49%18%8%
2112
November1st to 15thNight
58%6%12%16%6%
2428
16th to endNight
66%6%11%12%4
2520
December1st to 15thNight
68%7%8%12%2
2520
16th to endNight
73%6%7%9%3
2727

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%22%37%16%2
161
16th to endDay
24%17%35%18%3
256
February1st to 15thDay
22%16%33%23%3
236
16th to endDay
22%14%29%25%8%
213
March1st to 15thDay
20%18%35%20%5%
270
16th to endDay
26%14%27%21%9%
288
April1st to 15thDay
28%10%31%22%5%
270
16th to endDay
22%5%31%27%10%1
270
May1st to 15thDay
30%7%25%22%9%3
381
16th to endDay
30%424%29%9%1
519
June1st to 15thDay
32%423%26%12%1
495
16th to endDay
26%5%22%29%13%3
495
July1st to 15thDay
21%319%33%19%3
475
16th to endDay
26%116%32%20%2
460
August1st to 15thDay
21%214%37%20%4
313
16th to endDay
16%220%33%20%5%
332
September1st to 15thDay
18%6%22%34%17%
315
16th to endDay
20%8%20%31%15%4
254
October1st to 15thDay
25%8%27%19%14%5%
225
16th to endDay
30%16%26%17%7%
240
November1st to 15thDay
28%11%29%19%9%2
235
16th to endDay
27%16%29%17%7%
240
December1st to 15thDay
35%19%26%17%1
240
16th to endDay
33%17%32%12%2
209
January1st to 15thNight
26%21%33%15%2
750
16th to endNight
23%24%33%14%3
771
February1st to 15thNight
26%17%36%17%2
704
16th to endNight
23%17%33%18%5%1
631
March1st to 15thNight
23%15%34%21%4
720
16th to endNight
24%14%33%20%7%
768
April1st to 15thNight
29%11%29%22%7%
551
16th to endNight
25%9%32%24%7%
540
May1st to 15thNight
29%8%24%25%9%2
540
16th to endNight
23%431%30%9%
561
June1st to 15thNight
30%6%23%30%8%
477
16th to endNight
22%6%18%38%12%2
360
July1st to 15thNight
17%319%39%18%1
363
16th to endNight
21%322%36%15%
565
August1st to 15thNight
20%218%35%20%1
539
16th to endNight
16%423%31%21%3
573
September1st to 15thNight
17%427%34%16%
540
16th to endNight
17%9%29%30%11%1
662
October1st to 15thNight
22%12%30%21%10%2
660
16th to endNight
31%14%30%18%4
704
November1st to 15thNight
28%11%31%19%6%1
727
16th to endNight
26%18%28%20%5%
750
December1st to 15thNight
32%17%33%13%2
750
16th to endNight
33%21%27%13%3
800
Page generated at 2017-09-18 09:38:19. Version ac04

Copyright 2017 A. Danko


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