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 2005-11-06 to 2024-01-11.

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
25%
22480
13%
74696
7%
22439
33%
22439
14%
53901

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
10%
760
8%
2649
2%
757
18%
757
6%
2159
January11th to 20thNight
15%
724
10%
2532
3%
724
23%
724
7%
1977
January21st to endNight
18%
792
13%
2772
7%
792
28%
792
12%
2012
February1st to 10thNight
12%
720
11%
2367
3%
720
22%
720
9%
1821
February11th to 20thNight
13%
703
12%
2216
3%
700
25%
700
10%
1674
February21st to endNight
17%
592
15%
1776
6%
592
29%
592
13%
1319
March1st to 10thNight
16%
720
15%
2160
8%
720
25%
720
12%
1640
March11th to 20thNight
18%
720
14%
2066
5%
720
28%
720
13%
1546
March21st to endNight
24%
792
20%
2003
7%
792
33%
792
19%
1444
April1st to 10thNight
21%
720
15%
1800
4%
720
27%
720
18%
1359
April11th to 20thNight
25%
711
17%
1775
5%
711
31%
711
21%
1269
April21st to endNight
23%
588
15%
1668
7%
588
30%
588
16%
1204
May1st to 10thNight
26%
363
16%
1443
10%
363
39%
363
15%
967
May11th to 20thNight
29%
354
20%
1416
17%
354
44%
354
18%
913
May21st to endNight
27%
389
12%
1551
7%
388
41%
388
17%
981
June1st to 10thNight
29%
360
9%
1440
7%
360
39%
360
15%
963
June11th to 20thNight
38%
360
10%
1440
11%
360
45%
360
17%
924
June21st to endNight
40%
360
10%
1440
12%
360
46%
360
17%
955
July1st to 10thNight
46%
350
12%
1400
16%
350
54%
350
24%
811
July11th to 20thNight
46%
348
13%
1392
17%
348
53%
348
22%
835
July21st to endNight
47%
394
13%
1486
13%
372
52%
372
22%
892
August1st to 10thNight
53%
358
14%
1422
14%
356
58%
356
22%
849
August11th to 20thNight
49%
512
17%
1576
11%
512
54%
512
28%
1009
August21st to endNight
43%
792
17%
1980
7%
792
47%
792
30%
1320
September1st to 10thNight
41%
720
16%
1800
6%
720
46%
720
31%
1199
September11th to 20thNight
46%
720
19%
1854
11%
720
50%
720
33%
1206
September21st to endNight
39%
720
21%
1980
13%
720
45%
720
26%
1313
October1st to 10thNight
32%
720
19%
2132
11%
720
42%
720
19%
1484
October11th to 20thNight
24%
720
14%
2182
7%
720
33%
720
15%
1608
October21st to endNight
21%
792
11%
2574
5%
792
29%
792
13%
1933
November1st to 10thNight
24%
740
14%
2407
7%
740
33%
740
13%
1744
November11th to 20thNight
19%
760
15%
2593
9%
760
27%
760
11%
1926
November21st to endNight
18%
760
10%
2660
6%
760
24%
760
8%
2092
December1st to 10thNight
13%
760
8%
2660
3%
760
19%
760
6%
2197
December11th to 20thNight
14%
760
11%
3246
4%
759
21%
759
5%
2532
December21st to endNight
10%
826
7%
4838
2%
817
18%
817
4%
3824

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%11%48%6%35%5%5%6%29%
74734
Night
16%11%5%8%6%3445%6%31%
74955
TransparencyDay
55%5%10%19%10%1
74439
Night
54%6%10%19%10%1
74784
SeeingDay
25%19%30%17%6%2
13384
Night
23%17%29%23%8%1
22490

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
15%16%9%12%8%45%5%3419%
1517
11th to 20thDay
15%18%7%11%7%34435%23%
1440
21st to endDay
10%14%7%11%7%45%5%45%27%
1584
February1st to 10thDay
11%18%6%11%10%35%5%46%21%
1591
11th to 20thDay
12%18%6%11%7%45%35%5%25%
1631
21st to endDay
15%18%6%9%8%35%445%24%
1480
March1st to 10thDay
13%14%6%10%9%44446%26%
1797
11th to 20thDay
15%13%5%9%7%45%45%5%28%
1892
21st to endDay
18%11%48%5%34445%33%
2353
April1st to 10thDay
20%14%5%8%6%33446%30%
2160
11th to 20thDay
21%10%47%5%3445%5%33%
2134
21st to endDay
21%11%49%5%3445%5%29%
2302
May1st to 10thDay
20%11%47%5%3445%6%30%
2520
11th to 20thDay
20%9%36%6%345%5%6%33%
2478
21st to endDay
20%9%36%6%45%45%7%32%
2725
June1st to 10thDay
22%9%36%6%35%5%7%7%26%
2520
11th to 20thDay
16%7%37%6%46%46%8%32%
2520
21st to endDay
23%9%37%6%45%6%5%6%26%
2520
July1st to 10thDay
14%6%36%6%47%5%6%7%36%
2520
11th to 20thDay
15%6%36%7%46%6%7%9%32%
2520
21st to endDay
13%7%37%6%46%6%7%9%32%
2744
August1st to 10thDay
14%8%47%6%37%6%6%8%31%
2506
11th to 20thDay
14%7%26%6%46%6%7%9%32%
2304
21st to endDay
14%7%36%6%4446%8%37%
2376
September1st to 10thDay
16%7%35%6%345%6%7%39%
2160
11th to 20thDay
16%5%35%5%4446%7%41%
2106
21st to endDay
19%8%35%43446%6%38%
1980
October1st to 10thDay
22%9%35%5%3446%7%32%
1823
11th to 20thDay
24%11%47%7%445%5%5%25%
1777
21st to endDay
25%12%48%5%35%345%24%
1782
November1st to 10thDay
16%12%47%5%35%45%6%31%
1671
11th to 20thDay
19%14%6%9%8%3445%6%23%
1583
21st to endDay
20%15%7%8%7%35%5%5%421%
1520
December1st to 10thDay
21%19%7%11%6%34435%18%
1520
11th to 20thDay
19%16%7%11%6%3445%5%21%
1906
21st to endDay
21%19%7%10%6%23445%19%
2772
January1st to 10thNight
14%18%8%12%8%35%5%5%5%17%
2649
11th to 20thNight
14%18%7%11%8%34436%22%
2532
21st to endNight
10%12%6%10%8%5%5%5%5%8%28%
2772
February1st to 10thNight
11%14%6%11%9%45%5%46%24%
2367
11th to 20thNight
11%13%7%11%8%45%5%5%6%26%
2214
21st to endNight
13%14%6%11%5%46%45%7%27%
1776
March1st to 10thNight
14%13%5%11%7%46%445%28%
2150
11th to 20thNight
15%13%5%8%5%45%45%6%28%
2065
21st to endNight
15%10%47%6%35%445%38%
2003
April1st to 10thNight
22%10%47%5%43447%30%
1800
11th to 20thNight
17%7%46%6%345%6%5%37%
1775
21st to endNight
20%10%37%5%35%446%33%
1668
May1st to 10thNight
19%9%47%5%345%46%35%
1443
11th to 20thNight
19%7%35%6%2445%7%38%
1415
21st to endNight
16%7%46%43445%9%37%
1550
June1st to 10thNight
19%7%36%5%35%5%7%8%32%
1440
11th to 20thNight
19%6%35%6%345%5%8%37%
1440
21st to endNight
20%6%36%5%446%5%7%36%
1440
July1st to 10thNight
11%7%35%5%345%5%8%45%
1440
11th to 20thNight
13%5%36%6%35%5%6%8%41%
1440
21st to endNight
11%6%35%5%35%6%6%8%42%
1574
August1st to 10thNight
10%6%26%6%336%7%10%41%
1432
11th to 20thNight
10%7%26%5%35%45%8%44%
1576
21st to endNight
15%6%25%43446%8%43%
1980
September1st to 10thNight
12%7%35%4345%6%6%45%
1800
11th to 20thNight
15%5%244245%5%8%46%
1854
21st to endNight
18%6%25%4335%5%7%43%
1980
October1st to 10thNight
17%8%36%6%44446%37%
2132
11th to 20thNight
21%10%37%6%44446%31%
2182
21st to endNight
23%10%47%7%3445%7%26%
2574
November1st to 10thNight
18%10%5%8%6%35%46%7%29%
2407
11th to 20thNight
16%12%5%9%7%45%45%7%26%
2593
21st to endNight
18%16%5%10%7%445%45%23%
2660
December1st to 10thNight
17%16%8%11%9%35%45%5%16%
2660
11th to 20thNight
19%15%6%11%7%4443423%
3288
21st to endNight
21%21%6%9%6%3334419%
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
70%45%14%6%
1518
11th to 20thDay
65%5%6%12%11%2
1440
21st to endDay
58%5%6%17%11%2
1584
February1st to 10thDay
65%36%16%8%2
1591
11th to 20thDay
63%38%14%10%1
1640
21st to endDay
64%37%15%9%2
1480
March1st to 10thDay
59%5%7%16%11%2
1800
11th to 20thDay
58%49%14%12%3
1892
21st to endDay
53%48%18%13%4
2353
April1st to 10thDay
57%49%17%11%3
2160
11th to 20thDay
53%48%20%12%2
2134
21st to endDay
57%5%7%16%12%3
2302
May1st to 10thDay
54%5%7%19%12%3
2520
11th to 20thDay
51%5%8%19%15%2
2482
21st to endDay
52%5%10%19%13%1
2725
June1st to 10thDay
56%6%10%17%10%1
2520
11th to 20thDay
49%6%12%20%11%3
2520
21st to endDay
57%7%10%17%9%
2520
July1st to 10thDay
44%6%15%25%10%
2450
11th to 20thDay
45%7%13%25%9%
2445
21st to endDay
48%7%15%23%8%
2591
August1st to 10thDay
49%7%15%23%5%
2492
11th to 20thDay
44%8%18%22%8%
2304
21st to endDay
45%6%13%24%12%1
2376
September1st to 10thDay
44%5%13%25%13%
2160
11th to 20thDay
42%6%12%29%11%1
2106
21st to endDay
46%413%26%10%
1980
October1st to 10thDay
53%412%21%10%1
1823
11th to 20thDay
62%6%10%17%5%1
1777
21st to endDay
63%5%10%14%7%1
1782
November1st to 10thDay
53%5%14%19%8%1
1671
11th to 20thDay
62%6%11%12%9%1
1583
21st to endDay
65%7%10%13%41
1520
December1st to 10thDay
70%5%8%11%5%
1520
11th to 20thDay
66%6%9%13%6%
1906
21st to endDay
68%6%6%13%7%
2772
January1st to 10thNight
69%6%7%13%5%
2649
11th to 20thNight
65%5%8%11%8%3
2532
21st to endNight
56%5%8%16%13%2
2772
February1st to 10thNight
61%5%8%17%7%1
2367
11th to 20thNight
59%5%9%16%9%1
2216
21st to endNight
57%49%16%12%2
1776
March1st to 10thNight
59%5%7%16%10%2
2160
11th to 20thNight
57%5%9%15%13%2
2066
21st to endNight
49%5%8%19%15%4
2003
April1st to 10thNight
56%37%19%13%2
1800
11th to 20thNight
48%5%9%22%15%2
1775
21st to endNight
53%5%8%19%13%3
1668
May1st to 10thNight
51%5%8%19%14%4
1443
11th to 20thNight
45%6%9%20%17%3
1416
21st to endNight
45%6%11%22%13%3
1551
June1st to 10thNight
49%7%12%22%10%
1440
11th to 20thNight
46%6%10%22%13%3
1440
21st to endNight
48%7%12%21%12%
1440
July1st to 10thNight
37%7%16%27%13%1
1400
11th to 20thNight
40%7%15%29%9%
1392
21st to endNight
38%8%18%26%10%
1486
August1st to 10thNight
36%9%20%27%7%
1422
11th to 20thNight
39%6%17%27%10%
1576
21st to endNight
39%6%17%27%11%
1980
September1st to 10thNight
38%7%14%28%13%1
1800
11th to 20thNight
36%6%15%31%10%1
1854
21st to endNight
41%6%13%29%11%
1980
October1st to 10thNight
48%6%9%24%12%1
2132
11th to 20thNight
55%5%12%19%8%
2182
21st to endNight
57%6%12%15%8%1
2574
November1st to 10thNight
54%6%13%19%6%1
2407
11th to 20thNight
58%6%10%17%7%2
2593
21st to endNight
63%6%9%14%6%1
2660
December1st to 10thNight
70%6%8%11%4
2660
11th to 20thNight
66%5%7%15%7%1
3288
21st to endNight
69%46%13%6%
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
21%24%39%13%3
180
11th to 20thDay
28%21%32%13%6%1
160
21st to endDay
23%22%36%13%5%1
176
February1st to 10thDay
39%29%27%31
228
11th to 20thDay
26%32%35%6%1
298
21st to endDay
31%23%32%12%1
346
March1st to 10thDay
26%23%34%15%2
420
11th to 20thDay
29%25%29%14%31
420
21st to endDay
31%21%25%16%6%1
462
April1st to 10thDay
31%20%31%13%4
420
11th to 20thDay
34%20%23%13%8%1
412
21st to endDay
30%20%33%12%41
420
May1st to 10thDay
26%24%30%15%41
423
11th to 20thDay
25%21%32%16%6%1
447
21st to endDay
25%20%32%19%4
485
June1st to 10thDay
27%17%35%14%6%
450
11th to 20thDay
19%23%30%18%10%1
450
21st to endDay
27%14%32%19%6%1
450
July1st to 10thDay
16%12%35%27%8%2
445
11th to 20thDay
16%14%36%27%6%1
444
21st to endDay
14%14%36%27%7%1
488
August1st to 10thDay
18%11%30%28%11%2
446
11th to 20thDay
15%9%31%27%13%5%
439
21st to endDay
16%20%28%20%10%6%
495
September1st to 10thDay
20%14%30%21%10%5%
450
11th to 20thDay
16%15%29%21%12%8%
450
21st to endDay
22%17%23%22%11%5%
450
October1st to 10thDay
29%18%23%18%10%2
450
11th to 20thDay
30%22%25%16%6%1
438
21st to endDay
36%15%29%15%5%
396
November1st to 10thDay
32%19%28%17%31
365
11th to 20thDay
27%28%28%12%5%
243
21st to endDay
31%26%31%11%2
180
December1st to 10thDay
32%22%28%12%6%
180
11th to 20thDay
31%28%31%8%21
180
21st to endDay
35%26%24%10%41
198
January1st to 10thNight
24%22%35%16%4
760
11th to 20thNight
25%24%28%18%5%
724
21st to endNight
16%20%38%20%6%1
792
February1st to 10thNight
19%25%34%18%31
720
11th to 20thNight
21%24%36%15%3
703
21st to endNight
23%20%33%20%3
592
March1st to 10thNight
23%22%34%18%3
720
11th to 20thNight
24%25%28%18%41
720
21st to endNight
23%19%28%23%6%1
792
April1st to 10thNight
27%19%27%22%4
720
11th to 20thNight
23%19%29%23%5%1
711
21st to endNight
25%19%28%20%8%1
588
May1st to 10thNight
26%11%33%22%6%2
363
11th to 20thNight
21%13%31%27%8%1
354
21st to endNight
19%11%39%24%7%
389
June1st to 10thNight
24%8%31%29%8%
360
11th to 20thNight
22%8%25%32%12%1
360
21st to endNight
21%6%24%34%14%1
360
July1st to 10thNight
14%8%28%35%15%1
350
11th to 20thNight
14%7%23%39%16%1
348
21st to endNight
13%7%26%39%14%1
394
August1st to 10thNight
14%7%20%42%16%1
358
11th to 20thNight
13%6%24%32%24%1
512
21st to endNight
17%8%26%30%16%3
792
September1st to 10thNight
16%9%29%31%14%1
720
11th to 20thNight
18%10%23%31%17%1
720
21st to endNight
21%12%24%25%16%2
720
October1st to 10thNight
23%13%27%24%12%1
720
11th to 20thNight
28%14%29%22%8%1
720
21st to endNight
29%16%27%22%5%
792
November1st to 10thNight
26%20%26%22%6%1
740
11th to 20thNight
25%21%28%16%8%1
760
21st to endNight
29%24%24%17%5%1
760
December1st to 10thNight
30%21%27%16%6%
760
11th to 20thNight
28%24%26%16%41
760
21st to endNight
33%22%27%15%3
836
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