Parc national d'Oka
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parc national d'Oka 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
33%
14617
14%
46781
9%
14587
39%
14587
17%
33153

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
20%
720
9%
2506
5%
716
26%
716
9%
1957
January16th to endNight
23%
768
10%
2688
6%
768
30%
768
12%
1990
February1st to 15thNight
23%
703
9%
2300
6%
701
29%
701
11%
1773
February16th to endNight
26%
631
14%
1898
7%
631
35%
631
15%
1409
March1st to 15thNight
25%
720
13%
2160
9%
720
31%
720
15%
1619
March16th to endNight
35%
768
20%
1992
11%
768
42%
768
25%
1398
April1st to 15thNight
32%
718
17%
1796
6%
718
37%
718
21%
1333
April16th to endNight
32%
633
17%
1713
6%
633
39%
633
23%
1206
May1st to 15thNight
33%
384
17%
1464
14%
384
43%
384
17%
973
May16th to endNight
40%
374
13%
1497
14%
374
48%
374
17%
973
June1st to 15thNight
37%
360
9%
1440
9%
360
45%
360
15%
1000
June16th to endNight
46%
360
9%
1440
12%
360
51%
360
20%
897
July1st to 15thNight
52%
340
14%
1360
20%
340
59%
340
26%
774
July16th to endNight
56%
376
13%
1418
17%
354
59%
354
25%
817
August1st to 15thNight
56%
368
15%
1439
17%
366
59%
366
23%
841
August16th to endNight
56%
758
20%
1904
11%
758
59%
758
37%
1224
September1st to 15thNight
51%
707
15%
1768
8%
707
53%
707
29%
1226
September16th to endNight
50%
657
20%
1798
14%
657
54%
657
30%
1147
October1st to 15thNight
35%
660
19%
1952
11%
660
44%
660
21%
1345
October16th to endNight
28%
704
11%
2248
8%
704
33%
704
15%
1652
November1st to 15thNight
28%
700
17%
2277
11%
700
37%
700
17%
1620
November16th to endNight
22%
720
12%
2515
8%
720
29%
720
11%
1874
December1st to 15thNight
20%
720
9%
2520
5%
720
26%
720
9%
1972
December16th to endNight
14%
768
10%
2688
4%
768
22%
768
9%
2133

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
17%8%36%5%3445%6%33%
47884
Night
18%9%36%5%34446%32%
46950
Cloud CoverDay
17%8%36%5%3445%7%33%
47893
Night
18%9%36%5%34446%32%
46956
TransparencyDay
49%412%21%10%1
47571
Night
52%411%20%10%1
46781
SeeingDay
21%6%24%26%15%5%
5545
Night
23%7%26%29%11%
14619

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
21%13%5%8%6%3444422%
1432
16th to endDay
13%14%5%8%6%35%35%6%27%
1536
February1st to 15thDay
14%12%5%10%8%35%5%45%23%
1560
16th to endDay
17%12%5%8%6%3444428%
1575
March1st to 15thDay
18%10%5%7%8%35%44327%
1790
16th to endDay
18%8%36%433336%37%
2229
April1st to 15thDay
21%9%35%5%23445%32%
2152
16th to endDay
19%7%35%433445%37%
2247
May1st to 15thDay
20%6%36%5%44446%33%
2497
16th to endDay
18%7%25%5%3445%7%34%
2618
June1st to 15thDay
21%7%25%5%3445%7%31%
2520
16th to endDay
17%6%25%5%36%5%5%8%31%
2520
July1st to 15thDay
11%5%25%5%36%5%6%9%39%
2520
16th to endDay
11%5%245%46%5%7%11%35%
2654
August1st to 15thDay
12%6%26%6%35%5%6%8%35%
2500
16th to endDay
9%3144345%5%9%46%
2292
September1st to 15thDay
15%5%25%4245%5%8%40%
2112
16th to endDay
15%424423446%47%
1832
October1st to 15thDay
20%7%35%5%34445%35%
1675
16th to endDay
23%10%37%6%3345%6%26%
1623
November1st to 15thDay
16%8%46%5%345%6%7%32%
1581
16th to endDay
23%9%36%6%34445%28%
1443
December1st to 15thDay
25%12%49%5%245%5%6%19%
1440
16th to endDay
25%13%5%7%6%3434321%
1536
January1st to 15thNight
18%15%6%8%6%34445%21%
2506
16th to endNight
13%14%5%9%7%45%34426%
2688
February1st to 15thNight
13%12%5%10%7%36%5%5%6%22%
2298
16th to endNight
16%11%5%8%6%345%4429%
1898
March1st to 15thNight
20%11%47%6%35%44428%
2147
16th to endNight
16%10%36%32334440%
1992
April1st to 15thNight
25%7%35%5%24336%32%
1796
16th to endNight
21%7%25%5%24346%36%
1713
May1st to 15thNight
22%7%45%5%33345%34%
1464
16th to endNight
20%6%25%425%347%36%
1495
June1st to 15thNight
23%7%25%4345%5%8%29%
1440
16th to endNight
15%5%25%5%35%5%7%8%36%
1440
July1st to 15thNight
10%4146%35%5%5%10%42%
1440
16th to endNight
10%434425%5%7%9%42%
1514
August1st to 15thNight
10%5%35%4245%5%10%40%
1449
16th to endNight
11%42443336%7%48%
1904
September1st to 15thNight
15%5%36%5%3345%7%40%
1768
16th to endNight
17%423413345%48%
1798
October1st to 15thNight
17%6%35%5%34446%36%
1952
16th to endNight
24%8%37%5%3434429%
2248
November1st to 15thNight
19%8%36%5%3445%6%32%
2277
16th to endNight
22%11%47%5%2444427%
2515
December1st to 15thNight
23%15%47%5%24445%22%
2520
16th to endNight
24%16%5%6%5%2333422%
2688

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
21%13%5%8%7%335%4422%
1432
16th to endDay
13%14%5%7%7%35%35%6%26%
1536
February1st to 15thDay
14%13%5%9%7%36%5%5%5%23%
1560
16th to endDay
16%12%5%7%5%45%445%27%
1575
March1st to 15thDay
18%10%49%7%345%4427%
1800
16th to endDay
18%6%36%424347%37%
2228
April1st to 15thDay
21%7%45%6%33445%32%
2152
16th to endDay
18%7%26%5%33445%37%
2247
May1st to 15thDay
19%6%25%6%35%45%6%33%
2497
16th to endDay
18%6%25%5%3446%7%35%
2618
June1st to 15thDay
21%7%25%5%3445%7%32%
2520
16th to endDay
16%6%25%6%36%5%5%8%32%
2520
July1st to 15thDay
10%5%25%5%36%5%6%8%40%
2520
16th to endDay
11%425%5%35%6%7%9%37%
2654
August1st to 15thDay
11%6%25%6%446%6%9%35%
2500
16th to endDay
9%3134245%6%9%47%
2292
September1st to 15thDay
15%5%2443445%7%41%
2112
16th to endDay
14%415%424447%46%
1832
October1st to 15thDay
20%7%26%5%3445%5%35%
1675
16th to endDay
22%9%36%6%34447%25%
1623
November1st to 15thDay
16%9%45%5%345%7%7%31%
1581
16th to endDay
22%9%37%6%34436%27%
1443
December1st to 15thDay
25%12%48%5%35%5%5%5%18%
1440
16th to endDay
26%13%5%8%43344420%
1536
January1st to 15thNight
18%14%6%8%6%45%45%5%20%
2506
16th to endNight
14%13%6%8%6%45%445%26%
2688
February1st to 15thNight
13%13%6%10%7%36%5%46%21%
2291
16th to endNight
16%11%5%9%5%35%445%28%
1898
March1st to 15thNight
21%10%47%5%35%35%5%28%
2160
16th to endNight
17%10%35%42333440%
1992
April1st to 15thNight
25%7%26%434346%32%
1796
16th to endNight
22%7%25%5%24345%36%
1713
May1st to 15thNight
22%6%36%5%23346%35%
1464
16th to endNight
19%5%35%435%347%35%
1495
June1st to 15thNight
23%7%35%4245%5%8%28%
1440
16th to endNight
15%6%25%4445%7%7%35%
1440
July1st to 15thNight
10%315%6%35%6%6%10%41%
1440
16th to endNight
10%5%245%3447%8%42%
1514
August1st to 15thNight
11%5%26%4245%6%9%40%
1449
16th to endNight
12%32443445%8%46%
1904
September1st to 15thNight
15%6%35%5%24447%40%
1768
16th to endNight
17%5%23424345%47%
1798
October1st to 15thNight
18%5%36%4345%46%36%
1952
16th to endNight
25%7%37%6%34345%29%
2248
November1st to 15thNight
20%7%36%5%3435%5%32%
2277
16th to endNight
22%10%48%6%2344427%
2515
December1st to 15thNight
23%14%47%5%24446%21%
2520
16th to endNight
24%16%5%6%5%2334420%
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
64%48%14%6%
1433
16th to endDay
57%412%16%8%
1536
February1st to 15thDay
61%311%19%3
1562
16th to endDay
58%311%15%8%1
1575
March1st to 15thDay
58%312%16%8%1
1800
16th to endDay
47%310%18%15%4
2229
April1st to 15thDay
53%36%21%12%2
2152
16th to endDay
48%29%20%14%3
2247
May1st to 15thDay
50%49%20%13%2
2497
16th to endDay
47%411%21%12%1
2622
June1st to 15thDay
51%5%10%20%10%
2520
16th to endDay
47%5%13%21%9%1
2520
July1st to 15thDay
38%6%15%27%12%
2371
16th to endDay
40%6%18%24%9%
2487
August1st to 15thDay
42%6%18%23%8%
2486
16th to endDay
31%5%18%31%12%
2292
September1st to 15thDay
40%414%26%12%
2112
16th to endDay
38%411%33%11%
1832
October1st to 15thDay
49%411%23%9%
1675
16th to endDay
58%413%16%7%
1623
November1st to 15thDay
48%5%15%20%9%
1581
16th to endDay
57%5%9%19%6%
1443
December1st to 15thDay
65%7%11%12%2
1440
16th to endDay
66%5%9%12%5%
1536
January1st to 15thNight
64%49%15%4
2506
16th to endNight
59%410%16%7%
2688
February1st to 15thNight
61%5%11%15%4
2300
16th to endNight
57%49%17%10%
1898
March1st to 15thNight
58%39%17%9%1
2160
16th to endNight
48%38%19%16%4
1992
April1st to 15thNight
54%36%19%15%1
1796
16th to endNight
48%37%19%16%4
1713
May1st to 15thNight
50%37%18%15%4
1464
16th to endNight
48%49%21%14%1
1497
June1st to 15thNight
52%5%10%20%9%
1440
16th to endNight
43%5%14%19%15%
1440
July1st to 15thNight
34%6%12%29%15%
1360
16th to endNight
36%6%17%25%13%
1418
August1st to 15thNight
37%6%19%24%11%
1439
16th to endNight
34%415%30%13%
1904
September1st to 15thNight
43%5%10%25%14%
1768
16th to endNight
38%410%31%14%
1798
October1st to 15thNight
47%5%9%24%11%
1952
16th to endNight
57%412%18%6%
2248
November1st to 15thNight
53%412%18%9%2
2277
16th to endNight
59%5%11%17%6%
2515
December1st to 15thNight
64%5%11%15%2
2520
16th to endNight
65%5%9%12%6%
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
16%21%23%21%15%1
60
16th to endDay
34%7%29%18%6%3
64
February1st to 15thDay
32%11%39%16%1
87
16th to endDay
27%5%31%29%5%
234
March1st to 15thDay
21%9%34%26%7%
270
16th to endDay
25%7%23%27%13%2
288
April1st to 15thDay
30%8%25%22%10%2
270
16th to endDay
21%7%27%24%15%4
270
May1st to 15thDay
26%6%25%21%14%5%
288
16th to endDay
20%6%31%19%15%5%
331
June1st to 15thDay
26%7%21%29%11%3
315
16th to endDay
19%322%35%16%2
315
July1st to 15thDay
11%5%23%31%20%7%
305
16th to endDay
13%314%36%24%6%
326
August1st to 15thDay
13%218%33%22%9%
313
16th to endDay
9%321%28%21%14%
332
September1st to 15thDay
17%6%18%23%21%13%
299
16th to endDay
18%7%23%18%22%9%
254
October1st to 15thDay
20%6%21%27%18%5%
255
16th to endDay
27%8%28%23%10%
247
November1st to 15thDay
23%7%28%26%12%1
235
16th to endDay
33%6%25%26%7%
63
December1st to 15thDay
28%133%30%5%1
60
16th to endDay
37%9%35%15%1
64
January1st to 15thNight
24%11%30%27%5%
720
16th to endNight
21%10%33%25%8%
768
February1st to 15thNight
20%8%34%28%7%
704
16th to endNight
22%7%33%28%7%
631
March1st to 15thNight
26%9%29%28%6%
720
16th to endNight
21%7%26%32%10%
768
April1st to 15thNight
27%7%25%33%5%
718
16th to endNight
25%8%27%26%11%
633
May1st to 15thNight
25%426%30%10%2
384
16th to endNight
20%426%37%10%
375
June1st to 15thNight
29%122%34%10%
360
16th to endNight
17%225%36%15%1
360
July1st to 15thNight
10%324%37%21%1
340
16th to endNight
13%220%44%17%1
376
August1st to 15thNight
14%215%42%24%1
368
16th to endNight
13%220%35%26%1
758
September1st to 15thNight
18%318%39%18%1
707
16th to endNight
20%421%28%23%1
657
October1st to 15thNight
21%6%29%29%13%
660
16th to endNight
29%7%28%27%6%
704
November1st to 15thNight
25%8%29%24%11%
700
16th to endNight
27%11%28%19%11%1
720
December1st to 15thNight
32%11%26%24%4
720
16th to endNight
33%9%29%21%4
768
Page generated at 2017-09-13 07:39:13. Version ac04

Copyright 2017 A. Danko


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