Parc National du Mont-Orford
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Parc National du Mont-Orford clear sky chart from 2005-11-05 to 2017-09-22.

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
26%
14673
11%
46887
7%
14643
31%
14643
13%
35488

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%
720
7%
2506
3%
716
17%
716
6%
2100
January16th to endNight
15%
768
6%
2688
4%
768
19%
768
6%
2221
February1st to 15thNight
14%
703
6%
2306
2%
701
19%
701
6%
1947
February16th to endNight
17%
631
8%
1893
5%
631
22%
631
9%
1527
March1st to 15thNight
21%
720
12%
2160
8%
720
26%
720
12%
1686
March16th to endNight
26%
768
17%
2013
7%
768
33%
768
17%
1520
April1st to 15thNight
22%
718
13%
1796
4%
718
27%
718
15%
1428
April16th to endNight
24%
582
16%
1662
5%
582
32%
582
18%
1188
May1st to 15thNight
28%
458
15%
1538
11%
458
35%
458
16%
1069
May16th to endNight
29%
374
10%
1497
9%
374
37%
374
13%
1038
June1st to 15thNight
31%
360
8%
1440
8%
360
38%
360
12%
1025
June16th to endNight
39%
360
8%
1440
10%
360
44%
360
16%
954
July1st to 15thNight
45%
340
10%
1360
14%
340
48%
340
18%
858
July16th to endNight
47%
376
10%
1418
14%
354
50%
354
19%
889
August1st to 15thNight
50%
413
12%
1484
12%
411
52%
411
20%
966
August16th to endNight
51%
705
18%
1851
10%
705
54%
705
32%
1207
September1st to 15thNight
44%
720
11%
1828
6%
720
45%
720
26%
1289
September16th to endNight
44%
685
19%
1891
14%
685
47%
685
30%
1218
October1st to 15thNight
31%
660
16%
1895
9%
660
37%
660
17%
1393
October16th to endNight
21%
704
8%
2288
5%
704
26%
704
10%
1808
November1st to 15thNight
21%
700
13%
2277
9%
700
28%
700
11%
1741
November16th to endNight
21%
720
11%
2448
9%
720
26%
720
9%
1919
December1st to 15thNight
12%
720
4%
2520
1%
720
15%
720
5%
2166
December16th to endNight
8%
768
6%
2688
2%
768
13%
768
4%
2331

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
20%11%47%6%34445%27%
48003
Night
18%11%48%6%34445%27%
47057
TransparencyDay
58%6%11%16%7%
47691
Night
58%6%10%16%7%
46887
SeeingDay
26%14%28%18%9%3
5692
Night
25%14%27%23%8%
14675

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%16%6%14%9%46%43312%
1432
16th to endDay
12%16%6%10%9%5%6%6%45%17%
1536
February1st to 15thDay
12%17%9%13%9%5%6%43313%
1552
16th to endDay
13%18%7%12%9%4434418%
1580
March1st to 15thDay
17%16%6%8%6%345%3423%
1790
16th to endDay
18%13%5%8%5%2323430%
2208
April1st to 15thDay
21%15%5%6%5%2333427%
2152
16th to endDay
22%10%36%434345%33%
2297
May1st to 15thDay
24%7%36%6%2435%6%28%
2424
16th to endDay
21%7%26%7%345%5%6%27%
2618
June1st to 15thDay
29%7%244345%5%6%25%
2520
16th to endDay
22%7%35%5%35%45%7%28%
2520
July1st to 15thDay
17%6%26%5%35%5%7%8%31%
2520
16th to endDay
18%6%25%5%46%5%6%8%29%
2654
August1st to 15thDay
19%7%37%7%36%5%5%7%27%
2454
16th to endDay
15%7%25%43435%8%37%
2348
September1st to 15thDay
20%7%35%423336%39%
2131
16th to endDay
18%7%25%322447%40%
1881
October1st to 15thDay
25%10%35%5%2335%6%28%
1733
16th to endDay
26%17%46%5%3332322%
1584
November1st to 15thDay
19%14%46%5%24445%27%
1581
16th to endDay
18%16%7%8%5%33335%23%
1512
December1st to 15thDay
21%21%7%10%5%3333414%
1440
16th to endDay
23%21%8%11%6%3322312%
1536
January1st to 15thNight
15%17%8%12%7%45%44415%
2506
16th to endNight
10%16%7%11%10%46%5%4417%
2688
February1st to 15thNight
11%15%7%15%9%5%6%34417%
2305
16th to endNight
13%16%6%11%8%36%33423%
1893
March1st to 15thNight
19%13%6%7%6%3444426%
2147
16th to endNight
16%12%5%8%5%2433333%
2013
April1st to 15thNight
23%11%46%6%35%33427%
1796
16th to endNight
20%9%25%433346%35%
1662
May1st to 15thNight
21%7%36%6%23446%32%
1538
16th to endNight
19%6%35%6%35%45%7%31%
1495
June1st to 15thNight
29%6%2432336%8%27%
1440
16th to endNight
17%6%34425%5%6%9%33%
1440
July1st to 15thNight
14%5%35%5%36%5%7%9%34%
1440
16th to endNight
13%5%24435%5%6%7%39%
1514
August1st to 15thNight
15%425%5%345%5%8%37%
1494
16th to endNight
12%5%15%42435%7%45%
1851
September1st to 15thNight
18%5%25%423346%40%
1828
16th to endNight
19%5%23313347%46%
1891
October1st to 15thNight
20%10%25%5%24446%32%
1895
16th to endNight
27%11%37%43334424%
2288
November1st to 15thNight
18%11%5%7%6%45%445%26%
2277
16th to endNight
19%14%6%9%6%3422426%
2448
December1st to 15thNight
21%19%7%11%6%2433314%
2520
16th to endNight
21%20%8%10%6%3433313%
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
76%47%8%2
1433
16th to endDay
67%5%11%12%3
1536
February1st to 15thDay
75%5%6%10%1
1555
16th to endDay
69%48%9%6%1
1580
March1st to 15thDay
64%410%13%5%1
1800
16th to endDay
58%39%17%9%1
2208
April1st to 15thDay
60%37%16%9%1
2152
16th to endDay
53%5%9%17%11%3
2297
May1st to 15thDay
55%5%9%17%10%
2424
16th to endDay
54%8%11%16%8%
2622
June1st to 15thDay
57%7%11%15%7%
2520
16th to endDay
53%7%11%19%7%
2520
July1st to 15thDay
46%9%14%22%6%
2371
16th to endDay
51%7%15%19%5%
2487
August1st to 15thDay
53%8%16%17%3
2440
16th to endDay
43%6%16%23%10%
2348
September1st to 15thDay
46%6%12%23%10%
2131
16th to endDay
42%6%12%27%11%
1881
October1st to 15thDay
56%5%12%18%7%
1733
16th to endDay
66%411%13%4
1584
November1st to 15thDay
58%7%10%15%7%1
1581
16th to endDay
63%5%10%13%5%
1512
December1st to 15thDay
74%5%9%9%1
1440
16th to endDay
78%5%5%5%4
1536
January1st to 15thNight
71%5%9%9%3
2506
16th to endNight
69%6%8%11%4
2688
February1st to 15thNight
71%6%7%11%3
2306
16th to endNight
67%38%11%8%
1893
March1st to 15thNight
61%5%8%16%6%1
2160
16th to endNight
56%37%16%12%2
2013
April1st to 15thNight
60%46%14%12%1
1796
16th to endNight
49%6%9%18%13%2
1662
May1st to 15thNight
52%48%17%14%2
1538
16th to endNight
51%8%11%19%9%1
1497
June1st to 15thNight
54%7%10%20%6%
1440
16th to endNight
46%8%13%21%9%
1440
July1st to 15thNight
41%9%16%22%9%
1360
16th to endNight
41%9%16%22%9%
1418
August1st to 15thNight
43%8%19%22%6%
1484
16th to endNight
36%7%18%27%10%
1851
September1st to 15thNight
43%7%15%23%9%
1828
16th to endNight
37%6%13%28%12%
1891
October1st to 15thNight
52%6%10%20%9%
1895
16th to endNight
62%6%10%14%5%
2288
November1st to 15thNight
59%6%11%13%6%2
2277
16th to endNight
63%5%8%15%6%
2448
December1st to 15thNight
75%5%7%9%2
2520
16th to endNight
76%5%7%7%4
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
23%16%38%15%6%
60
16th to endDay
32%21%31%10%11
64
February1st to 15thDay
30%22%31%12%3
128
16th to endDay
25%22%30%17%2
239
March1st to 15thDay
30%21%25%18%3
270
16th to endDay
27%18%25%14%10%3
288
April1st to 15thDay
35%17%23%18%21
270
16th to endDay
29%14%29%13%9%3
270
May1st to 15thDay
34%13%27%12%9%2
288
16th to endDay
23%16%31%19%7%1
331
June1st to 15thDay
36%10%26%18%7%
315
16th to endDay
24%11%37%19%6%
315
July1st to 15thDay
20%9%33%23%8%3
305
16th to endDay
18%6%35%27%10%1
326
August1st to 15thDay
21%7%31%21%15%2
313
16th to endDay
21%8%23%21%15%9%
332
September1st to 15thDay
21%8%25%19%16%8%
315
16th to endDay
16%11%23%23%14%11%
278
October1st to 15thDay
27%14%21%17%13%4
254
16th to endDay
37%17%17%19%7%
240
November1st to 15thDay
28%15%29%18%5%2
235
16th to endDay
32%20%18%17%8%2
132
December1st to 15thDay
38%20%26%11%3
60
16th to endDay
39%26%28%6%
64
January1st to 15thNight
26%20%32%17%3
720
16th to endNight
21%21%32%18%5%
768
February1st to 15thNight
20%19%34%22%3
704
16th to endNight
24%17%32%21%3
631
March1st to 15thNight
32%14%28%20%4
720
16th to endNight
23%19%26%21%7%1
768
April1st to 15thNight
29%15%28%22%4
718
16th to endNight
25%17%27%20%8%
582
May1st to 15thNight
24%11%31%22%9%1
458
16th to endNight
23%9%30%27%8%
375
June1st to 15thNight
33%6%23%26%9%
360
16th to endNight
18%7%29%32%11%
360
July1st to 15thNight
13%429%32%18%
340
16th to endNight
13%328%38%17%
376
August1st to 15thNight
17%320%36%20%
413
16th to endNight
15%5%22%34%20%1
705
September1st to 15thNight
21%8%21%32%13%1
720
16th to endNight
20%7%24%26%18%1
685
October1st to 15thNight
26%12%24%22%11%1
660
16th to endNight
33%15%25%20%4
704
November1st to 15thNight
25%17%30%18%7%1
700
16th to endNight
27%20%25%15%8%1
720
December1st to 15thNight
32%21%28%13%4
720
16th to endNight
32%21%27%15%3
768
Page generated at 2017-09-23 06:43:47. Version ac04

Copyright 2017 A. Danko


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