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 2005-11-06 to 2024-03-23.

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
32%
22804
13%
81012
9%
22724
39%
22724
16%
57094

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 10thNight
19%
756
8%
4399
5%
737
25%
737
5%
3203
January11th to 20thNight
20%
755
8%
4384
5%
740
26%
740
7%
3176
January21st to endNight
25%
827
8%
4876
8%
814
33%
814
8%
3608
February1st to 10thNight
21%
760
12%
2490
6%
760
29%
760
11%
1913
February11th to 20thNight
24%
742
13%
2319
6%
740
34%
740
16%
1667
February21st to endNight
25%
628
15%
1884
7%
628
36%
628
17%
1373
March1st to 10thNight
25%
760
16%
2280
11%
760
32%
760
16%
1685
March11th to 20thNight
26%
760
15%
2191
7%
760
35%
760
18%
1596
March21st to endNight
33%
801
21%
2015
9%
801
40%
801
24%
1448
April1st to 10thNight
30%
720
16%
1800
5%
720
36%
720
20%
1344
April11th to 20thNight
30%
711
16%
1775
5%
711
36%
711
23%
1298
April21st to endNight
30%
590
17%
1670
7%
590
36%
590
20%
1190
May1st to 10thNight
34%
396
16%
1476
13%
396
43%
396
17%
985
May11th to 20thNight
37%
354
19%
1416
18%
354
50%
354
18%
901
May21st to endNight
39%
388
14%
1551
14%
388
49%
388
21%
947
June1st to 10thNight
37%
360
10%
1440
11%
360
47%
360
17%
977
June11th to 20thNight
42%
360
12%
1440
15%
360
50%
360
21%
875
June21st to endNight
42%
360
10%
1440
13%
360
49%
360
18%
923
July1st to 10thNight
54%
350
14%
1400
19%
350
62%
350
25%
804
July11th to 20thNight
52%
348
15%
1392
21%
348
57%
348
24%
799
July21st to endNight
55%
394
15%
1486
18%
372
59%
372
24%
860
August1st to 10thNight
59%
358
18%
1422
21%
356
62%
356
25%
804
August11th to 20thNight
53%
539
18%
1603
13%
539
57%
539
30%
1010
August21st to endNight
51%
792
18%
1980
9%
792
54%
792
34%
1320
September1st to 10thNight
52%
720
16%
1800
8%
720
54%
720
31%
1214
September11th to 20thNight
53%
720
21%
1862
13%
720
56%
720
35%
1181
September21st to endNight
46%
720
21%
1980
15%
720
51%
720
27%
1302
October1st to 10thNight
39%
720
19%
2115
12%
720
47%
720
22%
1461
October11th to 20thNight
32%
720
16%
2183
10%
720
40%
720
19%
1538
October21st to endNight
28%
792
12%
2574
8%
792
34%
792
15%
1876
November1st to 10thNight
28%
740
16%
2407
9%
740
38%
740
17%
1670
November11th to 20thNight
24%
760
17%
2558
10%
760
34%
760
16%
1809
November21st to endNight
20%
760
12%
2660
5%
760
28%
760
10%
2005
December1st to 10thNight
18%
760
9%
2660
5%
760
24%
760
9%
2103
December11th to 20thNight
19%
760
12%
3247
6%
759
27%
759
8%
2476
December21st to endNight
17%
823
6%
4837
4%
817
24%
817
6%
3753

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%9%47%6%35%5%5%7%33%
78512
Night
18%10%47%6%35%45%6%32%
81365
TransparencyDay
50%5%13%21%10%1
78217
Night
54%5%11%20%10%1
81194
SeeingDay
21%9%27%26%13%4
13673
Night
23%8%28%30%11%1
22837

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 10thDay
16%15%5%12%7%45%445%23%
2517
11th to 20thDay
15%12%6%9%7%45%5%6%6%25%
2520
21st to endDay
14%16%6%8%7%36%5%6%6%23%
2772
February1st to 10thDay
14%15%5%10%7%35%5%46%25%
1686
11th to 20thDay
14%11%5%9%7%45%6%6%5%28%
1748
21st to endDay
18%14%5%8%7%34445%28%
1570
March1st to 10thDay
17%12%5%8%7%35%445%30%
1897
11th to 20thDay
15%12%48%6%345%5%6%31%
1985
21st to endDay
18%9%37%5%44446%35%
2386
April1st to 10thDay
21%9%46%6%3345%5%33%
2160
11th to 20thDay
20%7%36%5%3445%6%37%
2134
21st to endDay
22%9%46%5%345%46%32%
2290
May1st to 10thDay
19%7%37%6%35%5%5%6%34%
2499
11th to 20thDay
17%7%36%5%4445%7%39%
2478
21st to endDay
17%7%35%6%35%5%6%8%37%
2725
June1st to 10thDay
21%7%36%5%45%5%6%7%31%
2520
11th to 20thDay
14%6%36%6%35%6%5%8%38%
2520
21st to endDay
19%8%36%6%35%5%6%8%31%
2520
July1st to 10thDay
11%5%36%5%45%5%6%8%43%
2520
11th to 20thDay
12%5%25%5%46%6%7%10%37%
2520
21st to endDay
12%5%25%5%46%5%7%10%38%
2744
August1st to 10thDay
12%6%26%6%35%6%7%8%38%
2506
11th to 20thDay
10%5%36%6%45%6%6%9%41%
2275
21st to endDay
13%5%25%5%35%5%6%9%42%
2376
September1st to 10thDay
12%5%36%5%35%5%6%9%41%
2160
11th to 20thDay
13%5%245%335%5%7%48%
2097
21st to endDay
17%5%25%5%345%5%7%41%
1980
October1st to 10thDay
21%7%35%5%345%5%5%37%
1841
11th to 20thDay
19%9%37%8%45%5%5%6%29%
1775
21st to endDay
25%11%36%5%3446%7%28%
1782
November1st to 10thDay
17%8%36%6%346%6%7%34%
1671
11th to 20thDay
18%10%5%7%6%45%5%5%7%28%
1620
21st to endDay
22%10%37%6%5%6%6%5%6%24%
1520
December1st to 10thDay
25%13%5%9%6%35%45%6%19%
1520
11th to 20thDay
21%13%48%6%345%5%426%
1906
21st to endDay
28%15%5%8%6%3433320%
2772
January1st to 10thNight
18%15%7%8%6%45%446%23%
4429
11th to 20thNight
13%13%5%11%9%5%5%5%6%6%22%
4440
21st to endNight
16%17%6%9%7%45%445%24%
4884
February1st to 10thNight
15%13%6%10%7%45%6%6%6%23%
2490
11th to 20thNight
14%10%49%7%46%5%6%7%29%
2317
21st to endNight
16%14%5%8%6%345%35%32%
1884
March1st to 10thNight
18%12%49%6%35%5%45%30%
2270
11th to 20thNight
18%13%47%5%4445%5%31%
2190
21st to endNight
18%10%37%424445%38%
2015
April1st to 10thNight
24%8%45%6%35%446%31%
1800
11th to 20thNight
22%7%36%5%24447%34%
1775
21st to endNight
21%9%36%6%2445%6%34%
1670
May1st to 10thNight
21%8%45%6%3335%6%35%
1476
11th to 20thNight
20%7%35%5%35%346%40%
1415
21st to endNight
16%6%25%5%35%45%7%41%
1550
June1st to 10thNight
21%7%26%5%445%6%8%31%
1440
11th to 20thNight
16%6%35%5%246%6%8%39%
1440
21st to endNight
16%6%26%6%45%5%6%8%35%
1440
July1st to 10thNight
12%425%5%46%5%6%8%44%
1440
11th to 20thNight
11%5%26%6%35%6%6%10%40%
1440
21st to endNight
11%6%35%5%35%5%6%9%42%
1574
August1st to 10thNight
12%5%35%425%5%411%43%
1432
11th to 20thNight
12%6%35%5%445%5%8%44%
1603
21st to endNight
13%5%35%5%3447%8%42%
1980
September1st to 10thNight
12%5%37%6%346%5%8%42%
1800
11th to 20thNight
16%5%25%5%2335%7%48%
1862
21st to endNight
17%5%35%42445%7%43%
1980
October1st to 10thNight
18%7%36%5%35%5%5%6%37%
2115
11th to 20thNight
20%8%37%6%35%5%46%34%
2183
21st to endNight
23%8%37%6%45%45%5%29%
2574
November1st to 10thNight
19%9%36%5%3445%7%32%
2407
11th to 20thNight
19%9%48%5%345%6%5%32%
2558
21st to endNight
22%12%5%8%6%34445%26%
2660
December1st to 10thNight
21%15%5%9%6%35%5%5%5%21%
2660
11th to 20thNight
23%15%48%6%3444425%
3288
21st to endNight
30%16%5%8%5%2334422%
4884

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 10thDay
63%315%13%5%1
2518
11th to 20thDay
58%5%13%16%8%1
2520
21st to endDay
61%5%16%13%5%
2772
February1st to 10thDay
60%410%19%5%2
1686
11th to 20thDay
56%413%17%9%1
1757
21st to endDay
60%310%15%9%2
1570
March1st to 10thDay
57%310%19%10%2
1900
11th to 20thDay
53%312%16%13%2
1985
21st to endDay
50%310%19%14%4
2386
April1st to 10thDay
53%5%7%21%12%2
2160
11th to 20thDay
48%38%23%16%2
2134
21st to endDay
54%39%18%13%4
2290
May1st to 10thDay
49%5%8%21%15%2
2499
11th to 20thDay
45%410%22%16%3
2482
21st to endDay
45%5%13%21%14%2
2725
June1st to 10thDay
51%5%11%20%12%1
2520
11th to 20thDay
43%5%11%23%14%3
2520
21st to endDay
50%5%14%19%10%1
2520
July1st to 10thDay
37%6%15%28%14%1
2450
11th to 20thDay
39%5%17%28%10%
2445
21st to endDay
40%6%17%27%9%
2591
August1st to 10thDay
41%6%18%27%9%
2492
11th to 20thDay
37%6%19%27%10%1
2275
21st to endDay
37%6%15%28%14%1
2376
September1st to 10thDay
38%6%15%28%13%
2160
11th to 20thDay
36%412%32%15%1
2097
21st to endDay
42%5%14%28%10%1
1980
October1st to 10thDay
49%5%11%23%11%
1841
11th to 20thDay
55%414%19%7%
1775
21st to endDay
56%5%13%18%8%1
1782
November1st to 10thDay
48%5%16%22%8%1
1671
11th to 20thDay
55%5%11%19%10%
1620
21st to endDay
60%6%13%16%5%1
1520
December1st to 10thDay
68%5%11%13%4
1520
11th to 20thDay
61%6%12%16%5%
1906
21st to endDay
70%310%12%5%
2772
January1st to 10thNight
64%315%13%4
4429
11th to 20thNight
61%5%13%16%41
4440
21st to endNight
64%413%12%6%1
4884
February1st to 10thNight
62%6%9%17%6%1
2490
11th to 20thNight
53%5%12%21%8%1
2319
21st to endNight
56%39%18%13%1
1884
March1st to 10thNight
57%48%18%11%2
2280
11th to 20thNight
55%49%17%12%3
2191
21st to endNight
50%36%21%16%4
2015
April1st to 10thNight
54%48%19%14%2
1800
11th to 20thNight
51%47%21%15%2
1775
21st to endNight
52%47%19%13%4
1670
May1st to 10thNight
50%46%18%16%5%
1476
11th to 20thNight
47%47%19%19%4
1416
21st to endNight
43%413%21%17%2
1551
June1st to 10thNight
51%5%10%21%11%1
1440
11th to 20thNight
43%5%12%23%16%2
1440
21st to endNight
46%6%14%20%14%
1440
July1st to 10thNight
36%6%13%27%18%1
1400
11th to 20thNight
37%6%14%30%12%
1392
21st to endNight
37%6%17%27%12%
1486
August1st to 10thNight
36%6%19%27%11%
1422
11th to 20thNight
38%5%17%25%13%
1603
21st to endNight
38%5%16%28%12%1
1980
September1st to 10thNight
40%6%11%27%16%1
1800
11th to 20thNight
37%313%34%13%1
1862
21st to endNight
41%6%11%28%14%
1980
October1st to 10thNight
47%6%9%24%12%1
2115
11th to 20thNight
52%411%24%9%
2183
21st to endNight
57%413%17%8%1
2574
November1st to 10thNight
52%412%22%9%1
2407
11th to 20thNight
53%5%13%18%10%1
2558
21st to endNight
61%5%11%16%6%
2660
December1st to 10thNight
66%5%11%15%4
2660
11th to 20thNight
63%5%8%17%6%
3288
21st to endNight
68%49%15%4
4884

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 10thDay
23%12%28%25%11%1
180
11th to 20thDay
28%12%32%21%7%1
180
21st to endDay
20%11%35%24%9%1
198
February1st to 10thDay
29%16%34%15%5%
258
11th to 20thDay
22%10%41%23%3
355
21st to endDay
28%9%30%29%4
382
March1st to 10thDay
23%10%35%24%8%
460
11th to 20thDay
20%13%35%23%7%2
460
21st to endDay
25%9%30%19%14%2
470
April1st to 10thDay
27%12%26%24%11%2
420
11th to 20thDay
25%12%26%22%12%3
412
21st to endDay
27%11%27%23%10%2
420
May1st to 10thDay
21%9%30%26%11%3
423
11th to 20thDay
19%6%32%25%14%4
447
21st to endDay
18%8%30%26%13%5%
485
June1st to 10thDay
22%8%24%29%13%4
450
11th to 20thDay
17%7%24%31%18%3
450
21st to endDay
21%6%25%27%16%5%
450
July1st to 10thDay
11%7%23%31%21%7%
445
11th to 20thDay
13%426%31%19%6%
444
21st to endDay
13%6%21%35%19%5%
488
August1st to 10thDay
15%421%30%22%8%
446
11th to 20thDay
11%421%33%21%10%
439
21st to endDay
14%7%25%24%21%9%
495
September1st to 10thDay
15%6%23%26%19%10%
450
11th to 20thDay
14%7%23%25%20%12%
450
21st to endDay
18%8%25%23%20%7%
450
October1st to 10thDay
22%8%25%25%14%6%
450
11th to 20thDay
20%12%30%23%14%2
437
21st to endDay
30%12%24%24%9%
396
November1st to 10thDay
26%13%23%28%9%1
365
11th to 20thDay
23%14%34%20%8%1
280
21st to endDay
25%14%33%21%7%1
180
December1st to 10thDay
32%8%27%24%8%1
180
11th to 20thDay
24%13%39%17%6%1
180
21st to endDay
32%13%29%18%6%2
198
January1st to 10thNight
25%12%30%28%5%
760
11th to 20thNight
27%9%33%26%5%1
760
21st to endNight
19%10%34%28%8%1
836
February1st to 10thNight
21%10%36%26%6%1
760
11th to 20thNight
20%11%36%29%5%
743
21st to endNight
22%9%34%29%5%
628
March1st to 10thNight
24%11%31%29%6%
760
11th to 20thNight
25%10%30%28%6%1
760
21st to endNight
23%8%27%32%10%
801
April1st to 10thNight
27%10%26%31%6%
720
11th to 20thNight
24%10%29%29%7%1
711
21st to endNight
27%9%26%28%10%
590
May1st to 10thNight
25%6%29%30%10%2
396
11th to 20thNight
21%6%28%34%10%1
354
21st to endNight
16%5%31%38%11%
389
June1st to 10thNight
26%327%33%11%1
360
11th to 20thNight
18%5%26%35%16%1
360
21st to endNight
18%5%26%33%18%1
360
July1st to 10thNight
12%423%40%20%1
350
11th to 20thNight
11%324%44%17%1
348
21st to endNight
13%422%43%17%2
394
August1st to 10thNight
15%315%45%22%1
358
11th to 20thNight
14%219%37%25%3
539
21st to endNight
15%322%34%23%3
792
September1st to 10thNight
14%422%40%19%1
720
11th to 20thNight
19%5%18%35%21%2
720
21st to endNight
19%6%23%30%19%3
720
October1st to 10thNight
21%7%27%31%14%1
720
11th to 20thNight
23%8%28%29%11%1
720
21st to endNight
27%9%30%28%6%
792
November1st to 10thNight
25%11%28%27%9%1
740
11th to 20thNight
23%13%33%20%9%1
760
21st to endNight
29%12%29%21%8%1
760
December1st to 10thNight
31%11%30%23%5%
760
11th to 20thNight
29%13%29%23%5%1
760
21st to endNight
35%11%27%22%5%
836
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