Réserve Fauniques des Laurentides
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Réserve Fauniques des Laurentides 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
21%
14577
10%
46782
5%
14545
28%
14545
12%
35318

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%
720
9%
2506
2%
716
19%
716
7%
2001
January16th to endNight
17%
768
11%
2688
3%
768
27%
768
9%
1980
February1st to 15thNight
17%
704
11%
2375
4%
701
27%
701
10%
1774
February16th to endNight
12%
631
10%
1893
3%
631
22%
631
10%
1492
March1st to 15thNight
16%
720
14%
2160
6%
720
26%
720
12%
1622
March16th to endNight
20%
768
16%
2023
5%
768
28%
768
15%
1492
April1st to 15thNight
16%
712
13%
1790
3%
712
23%
712
14%
1403
April16th to endNight
22%
540
13%
1620
5%
540
29%
540
14%
1172
May1st to 15thNight
23%
445
11%
1525
7%
445
30%
445
12%
1108
May16th to endNight
24%
375
9%
1441
5%
374
33%
374
11%
1038
June1st to 15thNight
30%
360
5%
1260
4%
360
34%
360
11%
939
June16th to endNight
30%
360
6%
1260
5%
360
33%
360
14%
918
July1st to 15thNight
36%
340
6%
1293
7%
340
39%
340
15%
909
July16th to endNight
39%
376
9%
1418
10%
354
42%
354
14%
980
August1st to 15thNight
42%
407
9%
1478
7%
405
46%
405
14%
1050
August16th to endNight
35%
633
12%
1779
6%
633
38%
633
20%
1246
September1st to 15thNight
32%
707
8%
1811
3%
707
34%
707
21%
1341
September16th to endNight
28%
657
14%
1815
8%
657
33%
657
20%
1272
October1st to 15thNight
22%
660
12%
1916
5%
660
29%
660
14%
1444
October16th to endNight
15%
704
7%
2288
4%
704
20%
704
8%
1834
November1st to 15thNight
19%
700
13%
2277
7%
700
27%
700
10%
1740
November16th to endNight
20%
741
10%
2591
7%
741
25%
741
8%
2033
December1st to 15thNight
12%
750
6%
2700
2%
750
17%
750
5%
2242
December16th to endNight
13%
799
10%
2875
4%
799
21%
799
6%
2288

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%13%5%8%6%34445%22%
47882
Night
16%12%5%8%6%35%446%24%
46951
TransparencyDay
60%6%10%13%7%1
47569
Night
57%7%11%15%8%1
46782
SeeingDay
27%17%29%17%7%1
6091
Night
23%18%29%20%6%
14577

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
12%15%7%9%7%45%446%21%
1432
16th to endDay
6%12%9%14%6%36%7%6%6%20%
1536
February1st to 15thDay
6%12%7%14%10%47%447%19%
1484
16th to endDay
9%16%8%12%9%46%445%19%
1580
March1st to 15thDay
14%15%5%10%6%25%346%25%
1790
16th to endDay
12%14%6%8%6%35%446%29%
2199
April1st to 15thDay
20%17%6%6%425%34424%
2158
16th to endDay
20%14%46%5%2434430%
2340
May1st to 15thDay
23%10%46%6%33445%26%
2436
16th to endDay
26%9%37%6%35%45%5%22%
2672
June1st to 15thDay
25%9%37%6%4445%6%23%
2700
16th to endDay
27%10%48%7%34445%19%
2700
July1st to 15thDay
22%9%47%6%5%6%5%5%7%19%
2586
16th to endDay
23%9%47%5%46%5%5%5%21%
2654
August1st to 15thDay
24%10%48%8%45%5%5%6%16%
2460
16th to endDay
19%9%47%8%345%6%8%22%
2422
September1st to 15thDay
24%10%36%424345%30%
2068
16th to endDay
23%9%24423446%32%
1815
October1st to 15thDay
26%16%37%433245%23%
1713
16th to endDay
24%21%5%7%5%3333417%
1584
November1st to 15thDay
18%19%7%9%5%2343421%
1581
16th to endDay
19%18%8%9%6%33335%20%
1365
December1st to 15thDay
18%20%9%9%6%24345%17%
1260
16th to endDay
13%18%10%10%7%2434420%
1347
January1st to 15thNight
11%15%8%11%9%6%445%5%16%
2506
16th to endNight
8%11%6%11%8%47%6%6%8%19%
2688
February1st to 15thNight
5%11%6%12%9%5%7%6%5%7%21%
2374
16th to endNight
9%17%7%13%7%37%5%45%19%
1893
March1st to 15thNight
13%12%5%9%6%35%5%46%26%
2147
16th to endNight
10%14%47%7%35%5%5%6%30%
2023
April1st to 15thNight
19%15%5%7%6%34435%24%
1790
16th to endNight
17%12%36%5%3444432%
1620
May1st to 15thNight
22%10%46%5%24346%28%
1525
16th to endNight
26%7%36%5%34436%28%
1439
June1st to 15thNight
21%10%46%6%35%5%46%25%
1260
16th to endNight
21%9%36%5%34347%29%
1260
July1st to 15thNight
18%8%36%5%35%5%5%8%29%
1372
16th to endNight
17%8%26%5%345%47%32%
1514
August1st to 15thNight
16%7%37%6%35%6%5%8%28%
1488
16th to endNight
16%5%26%6%45%5%5%7%33%
1779
September1st to 15thNight
22%7%25%5%24346%34%
1811
16th to endNight
23%6%245%23436%35%
1815
October1st to 15thNight
19%13%36%6%35%445%26%
1916
16th to endNight
25%17%5%7%5%2434419%
2288
November1st to 15thNight
18%15%6%7%6%36%35%6%21%
2277
16th to endNight
20%16%5%9%6%35%34421%
2591
December1st to 15thNight
16%18%7%12%9%44325%15%
2700
16th to endNight
14%17%8%11%8%44445%16%
2875

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
61%6%7%13%10%
1433
16th to endDay
56%6%9%14%11%1
1536
February1st to 15thDay
62%5%8%12%9%1
1487
16th to endDay
65%45%11%9%2
1580
March1st to 15thDay
59%47%12%12%3
1800
16th to endDay
55%5%8%15%11%3
2199
April1st to 15thDay
60%48%13%8%3
2158
16th to endDay
57%39%13%13%2
2340
May1st to 15thDay
57%5%10%14%9%1
2436
16th to endDay
61%7%9%15%6%
2676
June1st to 15thDay
59%8%10%14%5%1
2700
16th to endDay
65%6%10%11%6%
2700
July1st to 15thDay
58%9%13%13%4
2436
16th to endDay
63%8%9%13%5%
2487
August1st to 15thDay
64%8%13%10%2
2446
16th to endDay
55%8%15%16%4
2422
September1st to 15thDay
55%5%13%16%7%
2068
16th to endDay
50%6%12%20%8%
1815
October1st to 15thDay
61%6%9%15%6%
1713
16th to endDay
68%5%8%12%4
1584
November1st to 15thDay
64%6%7%15%5%
1581
16th to endDay
63%6%8%14%5%1
1365
December1st to 15thDay
68%49%10%6%
1260
16th to endDay
65%5%7%10%9%1
1347
January1st to 15thNight
65%6%8%11%6%1
2506
16th to endNight
57%6%9%16%8%1
2688
February1st to 15thNight
56%7%9%15%10%1
2375
16th to endNight
63%5%8%10%10%1
1893
March1st to 15thNight
56%6%8%15%10%2
2160
16th to endNight
51%5%10%17%11%3
2023
April1st to 15thNight
58%5%7%14%11%2
1790
16th to endNight
51%7%9%15%12%2
1620
May1st to 15thNight
56%5%11%15%10%1
1525
16th to endNight
56%5%14%15%7%
1441
June1st to 15thNight
56%8%11%17%5%
1260
16th to endNight
54%6%12%16%9%
1260
July1st to 15thNight
49%9%17%18%5%
1293
16th to endNight
49%9%13%19%7%
1418
August1st to 15thNight
48%10%18%18%3
1478
16th to endNight
44%9%18%22%4
1779
September1st to 15thNight
49%7%15%19%7%
1811
16th to endNight
47%6%14%24%6%
1815
October1st to 15thNight
55%7%12%16%7%
1916
16th to endNight
64%6%10%11%6%
2288
November1st to 15thNight
57%8%11%13%7%
2277
16th to endNight
62%7%9%11%7%1
2591
December1st to 15thNight
69%6%7%9%6%
2700
16th to endNight
65%6%8%10%7%1
2875

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
25%28%33%13%
60
16th to endDay
15%29%34%10%6%3
64
February1st to 15thDay
18%23%29%22%5%
116
16th to endDay
21%22%35%14%5%
239
March1st to 15thDay
23%23%30%16%5%
270
16th to endDay
19%23%25%20%9%2
288
April1st to 15thDay
30%20%31%10%5%1
270
16th to endDay
30%17%34%10%5%2
270
May1st to 15thDay
31%14%28%15%7%1
288
16th to endDay
30%17%30%15%41
385
June1st to 15thDay
29%14%28%19%7%
495
16th to endDay
28%15%29%20%7%
495
July1st to 15thDay
24%13%32%17%10%1
370
16th to endDay
26%11%32%23%5%
326
August1st to 15thDay
23%11%27%23%11%1
313
16th to endDay
21%14%28%16%13%4
332
September1st to 15thDay
28%15%24%19%9%4
299
16th to endDay
25%17%25%17%9%4
254
October1st to 15thDay
27%20%26%16%7%2
247
16th to endDay
36%16%28%12%5%
240
November1st to 15thDay
28%22%20%19%8%1
235
16th to endDay
34%15%28%13%5%2
111
December1st to 15thDay
35%15%38%6%5%
60
16th to endDay
37%34%23%31
64
January1st to 15thNight
19%25%35%15%4
720
16th to endNight
16%21%34%20%5%1
768
February1st to 15thNight
11%22%39%22%4
704
16th to endNight
20%21%38%14%4
631
March1st to 15thNight
20%23%34%17%3
720
16th to endNight
17%24%32%17%7%1
768
April1st to 15thNight
28%18%29%18%4
712
16th to endNight
26%18%28%20%6%
540
May1st to 15thNight
30%11%29%20%8%
445
16th to endNight
29%11%29%25%4
375
June1st to 15thNight
26%9%25%27%10%
360
16th to endNight
24%9%27%26%11%
360
July1st to 15thNight
22%8%28%27%12%1
340
16th to endNight
22%6%25%34%11%
376
August1st to 15thNight
20%6%21%32%17%1
407
16th to endNight
20%9%27%29%10%1
633
September1st to 15thNight
26%8%26%27%9%1
707
16th to endNight
25%16%26%21%9%1
657
October1st to 15thNight
27%16%27%20%6%1
660
16th to endNight
34%18%26%14%5%
704
November1st to 15thNight
26%21%25%19%6%1
700
16th to endNight
27%22%23%17%6%1
741
December1st to 15thNight
25%23%29%16%3
750
16th to endNight
26%23%27%17%41
799
Page generated at 2017-09-13 07:39:21. Version ac04

Copyright 2017 A. Danko


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