Ste-Agathe-des-Monts
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ste-Agathe-des-Monts clear sky chart from 2005-11-05 to 2017-09-16.

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%
14595
13%
46830
7%
14563
33%
14563
15%
33741

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
13%
720
7%
2506
2%
716
19%
716
7%
2022
January16th to endNight
17%
768
11%
2688
5%
768
25%
768
10%
2020
February1st to 15thNight
15%
704
11%
2305
3%
701
24%
701
10%
1759
February16th to endNight
17%
631
12%
1913
5%
631
27%
631
11%
1447
March1st to 15thNight
16%
720
13%
2157
6%
720
25%
720
12%
1647
March16th to endNight
27%
768
20%
1995
7%
768
35%
768
21%
1384
April1st to 15thNight
22%
718
16%
1796
5%
718
28%
718
19%
1330
April16th to endNight
25%
631
16%
1711
6%
631
32%
631
19%
1207
May1st to 15thNight
24%
362
15%
1442
10%
362
36%
362
14%
987
May16th to endNight
27%
375
13%
1497
9%
374
40%
374
16%
980
June1st to 15thNight
29%
360
7%
1440
4%
360
36%
360
13%
1008
June16th to endNight
40%
360
8%
1440
10%
360
44%
360
16%
949
July1st to 15thNight
46%
340
12%
1360
15%
340
53%
340
24%
777
July16th to endNight
49%
376
12%
1418
13%
354
55%
354
23%
843
August1st to 15thNight
52%
365
13%
1436
12%
363
58%
363
21%
895
August16th to endNight
47%
744
19%
1890
9%
744
52%
744
34%
1197
September1st to 15thNight
41%
720
14%
1800
6%
720
44%
720
28%
1247
September16th to endNight
41%
661
19%
1803
11%
661
46%
661
30%
1167
October1st to 15thNight
28%
660
17%
1963
9%
660
39%
660
18%
1382
October16th to endNight
22%
704
11%
2247
5%
704
30%
704
12%
1699
November1st to 15thNight
23%
700
17%
2295
9%
700
34%
700
13%
1647
November16th to endNight
20%
720
12%
2520
8%
720
26%
720
9%
1940
December1st to 15thNight
13%
720
8%
2520
2%
720
20%
720
7%
2037
December16th to endNight
10%
768
10%
2688
3%
768
19%
768
6%
2170

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
18%10%47%6%3445%6%28%
47941
Night
17%10%47%5%34446%31%
46999
Cloud CoverDay
18%10%36%6%3445%6%29%
47950
Night
16%9%46%5%34446%32%
47005
TransparencyDay
55%5%10%18%9%1
47628
Night
53%5%10%19%9%1
46830
SeeingDay
24%16%29%19%7%2
5526
Night
23%16%28%22%8%
14595

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
20%15%7%9%7%3442418%
1432
16th to endDay
11%15%6%10%7%35%445%24%
1536
February1st to 15thDay
11%16%6%11%8%35%436%22%
1555
16th to endDay
14%19%5%8%7%25%44424%
1560
March1st to 15thDay
15%13%5%10%7%35%335%25%
1793
16th to endDay
16%9%46%434346%35%
2229
April1st to 15thDay
21%11%46%423345%31%
2152
16th to endDay
20%9%46%434345%33%
2257
May1st to 15thDay
21%10%36%5%3435%6%27%
2511
16th to endDay
23%9%26%6%34446%29%
2618
June1st to 15thDay
22%8%36%6%36%46%6%25%
2520
16th to endDay
21%7%36%5%45%5%5%6%26%
2520
July1st to 15thDay
16%6%36%6%36%5%6%7%32%
2520
16th to endDay
14%7%37%5%46%6%6%8%29%
2654
August1st to 15thDay
16%7%37%6%36%6%6%7%27%
2512
16th to endDay
11%6%26%6%35%46%8%38%
2300
September1st to 15thDay
19%6%36%5%3445%7%35%
2160
16th to endDay
19%7%25%323346%42%
1847
October1st to 15thDay
23%9%35%5%33346%30%
1664
16th to endDay
26%12%37%6%35%34421%
1624
November1st to 15thDay
17%10%47%6%3445%6%29%
1561
16th to endDay
23%13%5%6%5%2435%5%25%
1440
December1st to 15thDay
22%19%6%8%433335%19%
1440
16th to endDay
20%18%7%9%6%23445%18%
1536
January1st to 15thNight
16%16%7%9%8%345%5%5%17%
2506
16th to endNight
10%14%7%9%7%45%448%23%
2688
February1st to 15thNight
10%14%6%10%8%45%445%24%
2303
16th to endNight
13%13%6%10%5%3445%7%24%
1913
March1st to 15thNight
17%11%5%9%5%45%346%27%
2144
16th to endNight
14%8%45%5%24445%40%
1995
April1st to 15thNight
23%8%45%433336%32%
1796
16th to endNight
19%8%25%5%24446%36%
1711
May1st to 15thNight
20%9%36%4235%45%33%
1442
16th to endNight
20%6%3443445%8%34%
1495
June1st to 15thNight
22%7%35%5%245%5%6%29%
1440
16th to endNight
19%425%4346%5%7%35%
1440
July1st to 15thNight
12%5%245%2445%8%44%
1440
16th to endNight
10%5%25%435%6%6%8%42%
1514
August1st to 15thNight
10%5%26%6%25%6%6%9%38%
1446
16th to endNight
11%5%1442445%7%47%
1890
September1st to 15thNight
15%6%344345%5%6%40%
1800
16th to endNight
18%413313445%46%
1803
October1st to 15thNight
17%7%36%5%34346%35%
1963
16th to endNight
25%9%36%5%34446%26%
2247
November1st to 15thNight
18%9%46%6%35%35%7%29%
2295
16th to endNight
19%14%5%8%5%34435%25%
2520
December1st to 15thNight
20%14%7%8%7%35%435%20%
2520
16th to endNight
20%17%6%9%6%3344419%
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
20%15%5%8%8%34345%20%
1432
16th to endDay
11%15%6%9%7%35%44426%
1536
February1st to 15thDay
11%15%5%10%9%35%436%23%
1555
16th to endDay
14%17%6%7%6%3443425%
1560
March1st to 15thDay
16%12%5%10%7%44435%26%
1803
16th to endDay
15%9%35%5%2435%6%35%
2228
April1st to 15thDay
22%10%35%5%23345%32%
2152
16th to endDay
20%9%35%5%24345%33%
2257
May1st to 15thDay
22%9%36%5%3435%6%28%
2511
16th to endDay
23%8%26%5%34446%30%
2618
June1st to 15thDay
22%7%26%6%35%5%6%6%26%
2520
16th to endDay
21%6%36%6%35%6%6%6%26%
2520
July1st to 15thDay
15%6%35%6%35%5%6%7%33%
2520
16th to endDay
14%6%36%6%36%6%6%8%30%
2654
August1st to 15thDay
15%7%36%7%46%6%6%7%29%
2512
16th to endDay
11%5%25%6%35%45%8%40%
2300
September1st to 15thDay
19%6%25%434447%36%
2160
16th to endDay
18%6%25%423336%43%
1847
October1st to 15thDay
23%9%36%5%2335%6%32%
1664
16th to endDay
26%11%38%6%3434423%
1624
November1st to 15thDay
16%9%46%6%345%5%7%30%
1561
16th to endDay
23%12%46%5%24345%27%
1440
December1st to 15thDay
22%17%6%8%5%23435%20%
1440
16th to endDay
20%16%6%9%5%2344420%
1536
January1st to 15thNight
16%15%6%9%7%3445%6%20%
2506
16th to endNight
9%14%6%9%7%45%446%27%
2688
February1st to 15thNight
10%13%6%9%10%35%445%26%
2296
16th to endNight
13%14%5%8%6%34446%27%
1913
March1st to 15thNight
17%11%48%5%36%445%27%
2157
16th to endNight
13%8%45%5%24346%41%
1995
April1st to 15thNight
23%8%35%433345%34%
1796
16th to endNight
19%7%35%5%24446%36%
1711
May1st to 15thNight
19%9%36%5%23435%34%
1442
16th to endNight
21%6%34424448%35%
1495
June1st to 15thNight
22%8%35%43445%6%30%
1440
16th to endNight
19%5%245%35%5%5%6%35%
1440
July1st to 15thNight
12%4245%3445%8%44%
1440
16th to endNight
10%5%245%25%5%6%7%43%
1514
August1st to 15thNight
11%425%6%35%5%7%9%39%
1446
16th to endNight
12%414433446%50%
1890
September1st to 15thNight
14%5%25%4335%6%6%42%
1800
16th to endNight
17%42431335%6%47%
1803
October1st to 15thNight
17%7%36%5%24446%36%
1963
16th to endNight
25%8%26%5%2445%6%28%
2247
November1st to 15thNight
18%8%36%5%3445%7%31%
2295
16th to endNight
19%13%5%6%5%24445%28%
2520
December1st to 15thNight
20%13%6%8%5%25%446%22%
2520
16th to endNight
20%16%6%8%6%33335%21%
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
69%46%12%5%
1433
16th to endDay
61%5%6%16%8%1
1536
February1st to 15thDay
63%38%17%6%
1557
16th to endDay
62%36%15%9%1
1560
March1st to 15thDay
62%39%14%9%1
1803
16th to endDay
49%48%18%15%4
2229
April1st to 15thDay
54%37%18%11%3
2152
16th to endDay
52%47%18%12%3
2257
May1st to 15thDay
56%47%17%11%1
2511
16th to endDay
55%410%17%9%1
2622
June1st to 15thDay
57%6%10%15%9%
2520
16th to endDay
55%6%10%18%6%1
2520
July1st to 15thDay
46%5%15%23%8%
2371
16th to endDay
50%7%14%19%8%
2487
August1st to 15thDay
52%8%14%19%5%
2498
16th to endDay
42%6%16%24%10%
2300
September1st to 15thDay
48%412%22%11%
2160
16th to endDay
43%312%29%9%
1847
October1st to 15thDay
54%49%20%9%
1664
16th to endDay
66%49%13%5%
1624
November1st to 15thDay
54%5%15%15%8%
1561
16th to endDay
60%5%10%16%6%
1440
December1st to 15thDay
69%49%13%3
1440
16th to endDay
68%5%6%10%8%
1536
January1st to 15thNight
67%5%9%12%4
2506
16th to endNight
59%5%8%16%8%1
2688
February1st to 15thNight
60%49%17%6%
2305
16th to endNight
59%49%15%10%1
1913
March1st to 15thNight
59%47%16%9%1
2157
16th to endNight
46%410%17%18%2
1995
April1st to 15thNight
53%36%22%12%2
1796
16th to endNight
48%5%9%18%15%2
1711
May1st to 15thNight
52%48%17%13%3
1442
16th to endNight
47%6%10%22%12%1
1497
June1st to 15thNight
53%6%11%19%8%
1440
16th to endNight
47%7%11%21%12%
1440
July1st to 15thNight
36%6%17%26%12%
1360
16th to endNight
37%7%18%25%10%
1418
August1st to 15thNight
39%9%19%24%7%
1436
16th to endNight
34%5%17%31%10%
1890
September1st to 15thNight
41%7%13%26%10%
1800
16th to endNight
38%5%13%31%10%
1803
October1st to 15thNight
50%410%22%10%
1963
16th to endNight
58%5%11%16%7%
2247
November1st to 15thNight
53%6%12%18%7%1
2295
16th to endNight
62%5%7%16%6%1
2520
December1st to 15thNight
67%5%8%14%3
2520
16th to endNight
67%5%7%11%6%1
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
26%20%31%18%3
60
16th to endDay
29%25%29%9%41
64
February1st to 15thDay
36%26%29%33
87
16th to endDay
26%23%31%14%2
219
March1st to 15thDay
23%23%31%18%2
270
16th to endDay
23%19%29%17%7%2
288
April1st to 15thDay
31%20%26%14%6%
270
16th to endDay
26%19%28%15%8%1
270
May1st to 15thDay
31%18%27%16%41
288
16th to endDay
28%16%30%18%6%
331
June1st to 15thDay
27%14%33%16%6%
315
16th to endDay
24%15%34%19%5%
315
July1st to 15thDay
18%9%39%23%7%2
305
16th to endDay
15%7%33%32%8%2
326
August1st to 15thDay
18%7%30%27%13%2
313
16th to endDay
14%11%31%21%12%8%
332
September1st to 15thDay
22%11%22%23%13%6%
315
16th to endDay
22%14%22%19%13%7%
257
October1st to 15thDay
28%17%22%19%10%2
255
16th to endDay
34%17%25%14%7%
247
November1st to 15thDay
23%21%27%20%5%1
215
16th to endDay
36%21%26%15%
60
December1st to 15thDay
36%25%21%13%3
60
16th to endDay
35%31%29%3
64
January1st to 15thNight
25%22%31%14%5%
720
16th to endNight
18%20%34%19%5%1
768
February1st to 15thNight
18%22%34%19%4
704
16th to endNight
22%20%34%17%4
631
March1st to 15thNight
24%21%32%19%2
720
16th to endNight
19%19%29%23%6%1
768
April1st to 15thNight
27%18%27%23%3
718
16th to endNight
24%19%27%19%7%
631
May1st to 15thNight
26%9%32%22%6%2
362
16th to endNight
22%10%36%21%8%
375
June1st to 15thNight
25%10%26%28%7%
360
16th to endNight
22%424%33%14%1
360
July1st to 15thNight
15%8%25%34%15%1
340
16th to endNight
12%5%26%40%14%1
376
August1st to 15thNight
15%322%37%19%1
365
16th to endNight
14%7%25%31%18%2
744
September1st to 15thNight
18%7%27%31%14%
720
16th to endNight
20%10%24%26%16%2
661
October1st to 15thNight
22%15%27%23%10%
660
16th to endNight
31%16%25%20%5%
704
November1st to 15thNight
23%20%26%20%7%1
700
16th to endNight
27%23%23%16%7%1
720
December1st to 15thNight
31%21%26%16%4
720
16th to endNight
31%22%27%14%31
768
Page generated at 2017-09-17 12:05:46. Version ac04

Copyright 2017 A. Danko


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