Rondeau Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rondeau Provincial Park 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
35%
15109
14%
46590
9%
15071
41%
15071
17%
32834

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%
785
8%
2394
3%
783
17%
783
8%
1979
January16th to endNight
17%
768
8%
2496
3%
768
23%
768
8%
2001
February1st to 15thNight
18%
701
8%
2287
3%
701
24%
701
10%
1772
February16th to endNight
25%
631
11%
1920
5%
631
32%
631
12%
1458
March1st to 15thNight
27%
720
14%
2028
8%
720
31%
720
15%
1498
March16th to endNight
32%
768
18%
2112
10%
768
38%
768
20%
1481
April1st to 15thNight
34%
662
14%
1837
8%
662
39%
662
20%
1312
April16th to endNight
39%
540
20%
1620
9%
540
47%
540
21%
1053
May1st to 15thNight
39%
540
14%
1620
9%
540
45%
540
18%
1141
May16th to endNight
50%
498
16%
1621
13%
498
55%
498
22%
1012
June1st to 15thNight
50%
360
16%
1389
16%
360
59%
360
21%
802
June16th to endNight
54%
360
19%
1260
18%
360
63%
360
24%
734
July1st to 15thNight
63%
464
17%
1336
16%
464
65%
464
34%
780
July16th to endNight
57%
564
16%
1595
12%
531
65%
531
33%
922
August1st to 15thNight
64%
539
19%
1609
15%
536
67%
536
32%
936
August16th to endNight
62%
573
25%
1719
18%
573
67%
573
33%
1003
September1st to 15thNight
56%
704
21%
1887
15%
704
59%
704
30%
1220
September16th to endNight
53%
657
20%
1815
14%
657
57%
657
29%
1150
October1st to 15thNight
45%
660
18%
1939
17%
660
49%
660
23%
1278
October16th to endNight
25%
704
13%
2141
6%
704
33%
704
14%
1564
November1st to 15thNight
33%
700
18%
2276
16%
700
38%
700
18%
1525
November16th to endNight
19%
720
11%
2499
6%
720
25%
720
9%
1888
December1st to 15thNight
14%
720
6%
2520
3%
720
18%
720
7%
2058
December16th to endNight
12%
771
5%
2670
1%
771
17%
771
5%
2267

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
13%7%36%5%35%5%5%7%34%
48025
Night
15%8%36%5%3445%6%34%
46775
Cloud CoverDay
14%7%36%5%35%5%5%7%35%
48035
Night
15%8%36%5%3445%6%34%
46779
TransparencyDay
46%8%14%19%10%1
47728
Night
49%7%12%19%11%1
46590
SeeingDay
15%11%18%28%20%5%
5634
Night
17%19%20%25%14%2
15117

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
19%12%5%9%8%46%446%17%
1532
16th to endDay
16%15%7%9%8%46%5%5%415%
1728
February1st to 15thDay
16%12%6%9%8%45%445%22%
1575
16th to endDay
14%9%5%9%8%36%5%5%6%25%
1551
March1st to 15thDay
18%8%5%7%7%45%445%27%
1921
16th to endDay
17%8%48%6%345%47%29%
2112
April1st to 15thDay
17%7%46%5%35%5%5%7%31%
2119
16th to endDay
16%6%25%5%2445%7%38%
2340
May1st to 15thDay
14%7%36%5%35%45%8%36%
2331
16th to endDay
10%425%425%46%8%43%
2491
June1st to 15thDay
9%5%25%5%25%5%6%8%41%
2567
16th to endDay
9%325%5%35%5%8%10%40%
2700
July1st to 15thDay
7%42442446%10%47%
2535
16th to endDay
7%424435%5%7%10%45%
2465
August1st to 15thDay
5%425%5%35%6%8%10%42%
2340
16th to endDay
9%4135%345%6%9%46%
2474
September1st to 15thDay
10%5%25%43445%7%44%
1989
16th to endDay
14%4145%3445%8%41%
1815
October1st to 15thDay
15%427%6%36%36%5%38%
1691
16th to endDay
23%7%36%434445%31%
1730
November1st to 15thDay
13%8%45%5%35%45%7%36%
1582
16th to endDay
19%14%5%8%5%25%5%46%21%
1460
December1st to 15thDay
20%16%6%8%6%345%6%5%17%
1440
16th to endDay
22%14%7%11%7%35%445%13%
1537
January1st to 15thNight
23%12%6%9%5%3435%421%
2394
16th to endNight
16%15%6%9%7%35%5%45%20%
2496
February1st to 15thNight
16%13%5%10%6%35%445%25%
2285
16th to endNight
17%10%48%6%45%5%5%5%25%
1920
March1st to 15thNight
18%11%36%5%4445%7%29%
2016
16th to endNight
16%7%36%5%2445%6%36%
2112
April1st to 15thNight
17%8%46%5%34446%35%
1837
16th to endNight
12%6%25%5%35%5%5%7%40%
1620
May1st to 15thNight
15%5%36%5%35%5%7%7%32%
1620
16th to endNight
11%5%25%43445%6%45%
1619
June1st to 15thNight
9%4245%346%7%8%43%
1389
16th to endNight
8%4245%35%47%8%46%
1260
July1st to 15thNight
6%324433447%55%
1418
16th to endNight
5%3145%2445%10%51%
1703
August1st to 15thNight
5%314435%5%7%9%49%
1620
16th to endNight
9%42442435%7%51%
1719
September1st to 15thNight
10%434434446%48%
1887
16th to endNight
12%5%25%43345%7%44%
1815
October1st to 15thNight
15%5%35%434447%41%
1939
16th to endNight
20%7%36%6%34447%30%
2141
November1st to 15thNight
13%6%37%6%35%45%6%37%
2276
16th to endNight
23%10%46%43445%6%25%
2499
December1st to 15thNight
22%13%5%8%5%35%5%46%18%
2520
16th to endNight
22%14%6%10%7%35%44415%
2670

Percentage Cloud Cover SE (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
19%12%5%10%8%45%5%45%17%
1532
16th to endDay
16%15%6%10%8%37%5%5%416%
1728
February1st to 15thDay
16%12%7%8%8%45%445%22%
1575
16th to endDay
14%10%5%8%7%37%5%5%6%25%
1551
March1st to 15thDay
19%8%48%6%445%45%27%
1932
16th to endDay
17%7%47%6%3445%7%29%
2111
April1st to 15thDay
18%7%45%5%35%45%7%31%
2119
16th to endDay
16%6%25%5%2446%6%38%
2340
May1st to 15thDay
15%7%26%5%35%45%7%36%
2331
16th to endDay
10%425%5%345%5%8%44%
2491
June1st to 15thDay
9%5%25%5%25%5%6%9%42%
2567
16th to endDay
9%325%5%35%6%7%10%41%
2700
July1st to 15thDay
8%31442446%9%49%
2535
16th to endDay
7%323435%5%7%10%45%
2465
August1st to 15thDay
5%425%5%35%6%8%11%42%
2340
16th to endDay
9%4144345%5%9%47%
2474
September1st to 15thDay
11%5%2443445%8%44%
1989
16th to endDay
14%424435%45%7%41%
1815
October1st to 15thDay
14%5%26%6%45%45%6%38%
1691
16th to endDay
23%7%36%42445%5%31%
1730
November1st to 15thDay
14%8%35%5%35%46%6%36%
1582
16th to endDay
19%14%5%8%6%25%5%46%22%
1460
December1st to 15thDay
20%15%5%8%6%335%47%17%
1440
16th to endDay
22%15%7%10%7%25%35%5%14%
1537
January1st to 15thNight
23%12%6%8%6%34345%20%
2394
16th to endNight
16%15%7%9%7%345%45%20%
2496
February1st to 15thNight
16%13%5%10%7%25%445%25%
2278
16th to endNight
18%9%47%6%5%5%5%5%5%26%
1920
March1st to 15thNight
18%10%35%5%3445%7%29%
2028
16th to endNight
16%8%36%5%2445%7%36%
2112
April1st to 15thNight
17%8%35%5%34446%35%
1837
16th to endNight
12%5%25%5%35%5%5%7%40%
1620
May1st to 15thNight
15%5%36%5%45%5%6%7%32%
1619
16th to endNight
11%5%25%425%447%45%
1619
June1st to 15thNight
10%4245%345%6%8%44%
1389
16th to endNight
9%5%144345%6%8%46%
1260
July1st to 15thNight
6%414423446%55%
1418
16th to endNight
6%3145%335%5%9%51%
1703
August1st to 15thNight
5%315%425%5%7%9%50%
1620
16th to endNight
9%424333448%51%
1719
September1st to 15thNight
11%5%34424446%47%
1887
16th to endNight
13%4235%2345%7%45%
1815
October1st to 15thNight
15%5%25%425%447%42%
1939
16th to endNight
21%7%36%6%33447%31%
2141
November1st to 15thNight
13%7%35%5%345%5%6%38%
2276
16th to endNight
23%10%36%5%3435%6%26%
2499
December1st to 15thNight
23%12%5%8%6%25%446%20%
2520
16th to endNight
22%13%6%11%6%35%44416%
2670

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
69%7%9%10%3
1533
16th to endDay
68%7%12%8%3
1728
February1st to 15thDay
62%7%11%13%4
1577
16th to endDay
57%7%12%16%4
1551
March1st to 15thDay
58%8%11%14%6%
1932
16th to endDay
51%6%13%18%8%1
2112
April1st to 15thDay
49%8%12%18%11%
2119
16th to endDay
45%5%13%19%13%2
2340
May1st to 15thDay
45%7%13%21%10%1
2331
16th to endDay
36%8%15%23%13%1
2495
June1st to 15thDay
37%9%14%23%13%1
2567
16th to endDay
35%8%17%20%16%1
2700
July1st to 15thDay
29%8%13%28%18%2
2388
16th to endDay
33%8%18%24%13%2
2310
August1st to 15thDay
32%10%18%24%13%
2327
16th to endDay
32%7%17%27%12%2
2474
September1st to 15thDay
37%7%15%26%11%
1989
16th to endDay
39%7%14%24%12%
1815
October1st to 15thDay
45%7%13%19%12%1
1691
16th to endDay
53%7%16%15%6%
1730
November1st to 15thDay
45%10%13%18%10%1
1582
16th to endDay
62%8%13%12%3
1460
December1st to 15thDay
66%8%14%8%2
1440
16th to endDay
73%8%8%8%1
1537
January1st to 15thNight
68%6%9%10%5%
2394
16th to endNight
64%6%13%11%3
2496
February1st to 15thNight
61%7%11%15%4
2287
16th to endNight
57%6%12%16%6%
1920
March1st to 15thNight
54%6%11%19%7%1
2028
16th to endNight
47%6%11%23%10%1
2112
April1st to 15thNight
49%5%11%19%11%1
1837
16th to endNight
42%5%11%19%17%4
1620
May1st to 15thNight
47%7%11%18%12%3
1620
16th to endNight
38%7%11%23%17%1
1621
June1st to 15thNight
35%7%12%26%15%1
1389
16th to endNight
33%8%12%23%20%1
1260
July1st to 15thNight
30%5%10%26%23%3
1336
16th to endNight
29%7%14%25%19%3
1595
August1st to 15thNight
27%9%14%31%14%2
1609
16th to endNight
30%6%12%29%18%2
1719
September1st to 15thNight
35%7%11%24%17%2
1887
16th to endNight
36%6%12%27%15%
1815
October1st to 15thNight
41%7%12%18%19%
1939
16th to endNight
53%6%14%17%6%
2141
November1st to 15thNight
45%6%14%19%11%1
2276
16th to endNight
59%6%12%16%5%
2499
December1st to 15thNight
65%8%12%9%3
2520
16th to endNight
70%7%10%8%3
2670

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%10%43%16%8%
90
16th to endDay
33%9%36%17%3
96
February1st to 15thDay
20%16%38%22%2
90
16th to endDay
18%6%35%38%1
81
March1st to 15thDay
22%19%20%28%9%
222
16th to endDay
22%12%24%29%8%2
288
April1st to 15thDay
20%14%25%28%9%1
270
16th to endDay
17%12%24%28%10%6%
270
May1st to 15thDay
18%12%19%28%18%2
288
16th to endDay
13%10%18%28%23%5%
331
June1st to 15thDay
11%11%12%37%24%2
362
16th to endDay
11%13%15%33%20%4
495
July1st to 15thDay
9%10%12%31%30%6%
450
16th to endDay
7%10%10%29%33%8%
326
August1st to 15thDay
8%7%9%37%26%11%
313
16th to endDay
10%7%9%25%36%11%
332
September1st to 15thDay
11%8%13%24%28%14%
299
16th to endDay
18%7%11%20%30%11%
254
October1st to 15thDay
14%12%19%25%21%6%
255
16th to endDay
24%16%27%23%7%
242
November1st to 15thDay
13%6%22%33%20%4
90
16th to endDay
23%20%22%26%6%
63
December1st to 15thDay
21%25%31%16%5%
60
16th to endDay
26%31%35%5%
67
January1st to 15thNight
23%26%30%15%3
788
16th to endNight
21%24%25%21%6%
768
February1st to 15thNight
21%22%28%22%4
704
16th to endNight
19%20%23%29%6%
631
March1st to 15thNight
20%20%24%25%9%
720
16th to endNight
17%19%23%26%10%2
768
April1st to 15thNight
18%19%21%31%7%
662
16th to endNight
12%20%20%32%11%2
540
May1st to 15thNight
15%18%17%27%17%2
540
16th to endNight
11%18%12%30%22%4
500
June1st to 15thNight
11%18%13%35%19%1
360
16th to endNight
10%17%11%33%25%2
360
July1st to 15thNight
7%12%9%32%32%5%
464
16th to endNight
6%17%11%29%29%4
564
August1st to 15thNight
7%10%8%35%29%8%
539
16th to endNight
9%9%10%25%37%6%
573
September1st to 15thNight
12%11%11%24%30%9%
704
16th to endNight
14%11%13%25%26%8%
657
October1st to 15thNight
18%13%16%25%21%4
660
16th to endNight
25%18%27%22%6%
704
November1st to 15thNight
16%21%21%24%12%2
700
16th to endNight
26%29%20%14%8%
720
December1st to 15thNight
27%26%25%14%5%
720
16th to endNight
25%26%28%15%3
771
Page generated at 2017-09-13 07:39:05. Version ac04

Copyright 2017 A. Danko


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