Saint-Michel-des-Saints
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Saint-Michel-des-Saints clear sky chart from 2005-11-06 to 2024-01-16.

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
24%
22435
11%
74767
6%
22393
31%
22393
13%
55631

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
8%
760
7%
2649
1%
757
16%
757
6%
2219
January11th to 20thNight
13%
744
8%
2602
2%
744
19%
744
7%
2074
January21st to endNight
18%
792
12%
2772
6%
792
28%
792
11%
2056
February1st to 10thNight
14%
720
11%
2400
3%
720
24%
720
9%
1864
February11th to 20thNight
13%
703
10%
2213
3%
700
22%
700
9%
1728
February21st to endNight
16%
592
14%
1776
5%
592
27%
592
13%
1338
March1st to 10thNight
17%
720
11%
2160
6%
720
24%
720
11%
1705
March11th to 20thNight
19%
720
14%
2084
6%
720
27%
720
12%
1600
March21st to endNight
23%
792
18%
1990
6%
792
31%
792
17%
1485
April1st to 10thNight
20%
720
12%
1800
4%
720
24%
720
14%
1426
April11th to 20thNight
26%
711
16%
1775
6%
711
32%
711
20%
1279
April21st to endNight
22%
562
15%
1642
7%
562
28%
562
16%
1178
May1st to 10thNight
29%
360
15%
1440
11%
360
40%
360
15%
966
May11th to 20thNight
29%
354
18%
1416
14%
354
45%
354
16%
935
May21st to endNight
26%
389
10%
1551
7%
388
37%
388
15%
1025
June1st to 10thNight
27%
360
7%
1440
5%
360
36%
360
14%
982
June11th to 20thNight
35%
360
8%
1440
8%
360
41%
360
16%
951
June21st to endNight
41%
360
8%
1440
9%
360
44%
360
17%
959
July1st to 10thNight
40%
350
9%
1400
9%
350
49%
350
19%
889
July11th to 20thNight
41%
348
12%
1392
15%
348
48%
348
19%
857
July21st to endNight
43%
394
11%
1486
13%
372
46%
372
19%
943
August1st to 10thNight
51%
358
12%
1422
13%
356
56%
356
20%
897
August11th to 20thNight
47%
475
14%
1539
11%
475
51%
475
22%
1034
August21st to endNight
37%
792
15%
1980
7%
792
41%
792
25%
1387
September1st to 10thNight
40%
720
13%
1800
6%
720
42%
720
28%
1242
September11th to 20thNight
38%
720
16%
1862
8%
720
42%
720
28%
1271
September21st to endNight
35%
720
19%
1980
12%
720
40%
720
24%
1352
October1st to 10thNight
29%
720
19%
2120
11%
720
39%
720
19%
1466
October11th to 20thNight
23%
720
11%
2204
6%
720
30%
720
13%
1692
October21st to endNight
19%
792
9%
2574
4%
792
26%
792
10%
2040
November1st to 10thNight
20%
740
12%
2407
5%
740
28%
740
11%
1818
November11th to 20thNight
19%
760
13%
2601
8%
760
27%
760
9%
2024
November21st to endNight
16%
760
8%
2660
4%
760
21%
760
7%
2155
December1st to 10thNight
12%
760
5%
2660
1%
760
17%
760
6%
2252
December11th to 20thNight
13%
760
9%
3245
3%
759
19%
759
5%
2615
December21st to endNight
10%
827
6%
4845
2%
817
17%
817
3%
3927

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%12%5%8%7%45%45%6%27%
74780
Night
16%13%5%8%7%45%45%6%28%
75020
TransparencyDay
56%7%10%16%9%1
74485
Night
56%7%11%17%8%1
74849
SeeingDay
25%19%31%17%6%2
13363
Night
23%16%31%22%8%1
22444

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
12%19%8%13%10%5%6%44415%
1517
11th to 20thDay
12%17%7%12%9%36%45%5%20%
1480
21st to endDay
9%12%6%11%10%46%6%6%6%24%
1584
February1st to 10thDay
8%17%7%11%12%5%6%35%6%19%
1557
11th to 20thDay
11%16%6%12%7%5%6%5%4423%
1634
21st to endDay
14%17%6%11%9%46%34323%
1480
March1st to 10thDay
13%14%7%11%9%5%5%445%24%
1797
11th to 20thDay
12%15%6%10%7%45%5%46%26%
1873
21st to endDay
15%13%6%9%6%34445%31%
2366
April1st to 10thDay
19%17%6%9%6%43435%25%
2160
11th to 20thDay
21%11%5%6%5%2434434%
2134
21st to endDay
20%13%5%7%6%33445%29%
2331
May1st to 10thDay
21%12%37%5%25%346%31%
2520
11th to 20thDay
20%8%37%6%345%5%6%32%
2478
21st to endDay
21%9%36%6%34446%32%
2725
June1st to 10thDay
24%9%36%6%35%46%6%27%
2520
11th to 20thDay
19%7%36%6%35%5%5%9%32%
2520
21st to endDay
22%9%47%7%36%5%6%7%24%
2520
July1st to 10thDay
15%8%47%6%46%6%6%9%31%
2520
11th to 20thDay
14%7%36%7%47%6%7%10%29%
2520
21st to endDay
13%8%48%6%46%6%6%8%32%
2744
August1st to 10thDay
17%8%37%7%47%7%7%8%25%
2506
11th to 20thDay
16%7%36%8%45%5%5%8%33%
2342
21st to endDay
15%7%37%6%45%5%6%9%34%
2376
September1st to 10thDay
17%7%35%5%445%6%7%38%
2160
11th to 20thDay
17%8%35%6%3445%6%38%
2098
21st to endDay
22%8%25%5%34447%36%
1980
October1st to 10thDay
22%11%36%6%3445%6%29%
1836
11th to 20thDay
21%15%49%8%35%44422%
1754
21st to endDay
25%15%5%8%7%4333422%
1782
November1st to 10thDay
15%16%5%7%6%35%445%29%
1671
11th to 20thDay
17%17%6%11%7%45%445%20%
1577
21st to endDay
16%19%8%12%8%3443419%
1520
December1st to 10thDay
20%19%7%11%7%45%5%35%16%
1520
11th to 20thDay
18%17%6%13%8%34446%18%
1906
21st to endDay
18%18%7%11%9%35%435%16%
2772
January1st to 10thNight
14%18%9%14%9%5%5%5%4413%
2649
11th to 20thNight
12%16%6%12%10%5%6%5%6%6%17%
2602
21st to endNight
8%12%6%11%11%5%7%5%6%7%23%
2772
February1st to 10thNight
9%13%6%11%11%6%6%7%5%6%20%
2400
11th to 20thNight
9%15%6%11%9%6%7%6%5%5%21%
2211
21st to endNight
12%14%5%10%8%45%45%6%26%
1776
March1st to 10thNight
15%15%6%8%10%45%5%45%23%
2150
11th to 20thNight
15%15%5%8%8%45%35%6%26%
2083
21st to endNight
14%13%5%9%5%45%435%34%
1990
April1st to 10thNight
21%13%6%9%6%34346%26%
1800
11th to 20thNight
16%10%46%5%35%45%7%36%
1775
21st to endNight
21%11%5%7%5%23445%34%
1642
May1st to 10thNight
21%10%36%5%2345%6%35%
1440
11th to 20thNight
19%9%36%425%45%6%37%
1415
21st to endNight
18%8%36%6%34447%37%
1550
June1st to 10thNight
20%8%36%5%445%6%8%31%
1440
11th to 20thNight
16%8%36%5%36%45%7%36%
1440
21st to endNight
18%6%45%5%445%5%8%35%
1440
July1st to 10thNight
12%7%26%5%445%6%9%39%
1440
11th to 20thNight
12%5%35%6%45%5%6%9%40%
1440
21st to endNight
11%6%36%6%36%6%6%9%39%
1574
August1st to 10thNight
11%6%36%5%35%6%6%9%39%
1432
11th to 20thNight
12%6%36%5%35%5%6%8%39%
1539
21st to endNight
15%8%26%5%445%5%7%39%
1980
September1st to 10thNight
16%8%25%5%35%45%7%41%
1800
11th to 20thNight
18%6%25%5%3445%6%43%
1862
21st to endNight
17%9%35%424446%42%
1980
October1st to 10thNight
17%10%46%5%34446%38%
2120
11th to 20thNight
21%15%47%5%34446%26%
2204
21st to endNight
23%14%47%7%3445%6%22%
2574
November1st to 10thNight
15%14%6%8%6%45%5%5%6%26%
2407
11th to 20thNight
15%12%7%12%7%45%45%6%23%
2601
21st to endNight
18%17%7%10%8%34445%19%
2660
December1st to 10thNight
17%19%8%13%9%45%35%414%
2660
11th to 20thNight
18%17%7%11%8%45%445%19%
3288
21st to endNight
19%20%7%11%9%4443416%
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
73%46%11%5%
1518
11th to 20thDay
65%5%9%12%7%1
1480
21st to endDay
60%5%7%15%11%2
1584
February1st to 10thDay
67%47%14%8%2
1557
11th to 20thDay
63%5%9%12%11%1
1643
21st to endDay
66%46%14%9%2
1480
March1st to 10thDay
61%6%7%15%9%3
1800
11th to 20thDay
58%5%10%12%12%2
1873
21st to endDay
56%5%8%16%12%3
2366
April1st to 10thDay
62%5%9%13%9%2
2160
11th to 20thDay
54%5%8%20%11%2
2134
21st to endDay
58%6%7%14%12%3
2331
May1st to 10thDay
54%5%8%18%12%2
2520
11th to 20thDay
51%7%9%17%13%2
2482
21st to endDay
53%7%10%17%12%1
2725
June1st to 10thDay
56%8%10%16%9%1
2520
11th to 20thDay
47%9%13%19%10%2
2520
21st to endDay
58%8%11%15%8%
2520
July1st to 10thDay
47%9%14%20%8%
2450
11th to 20thDay
47%10%15%21%8%
2445
21st to endDay
48%11%15%20%7%
2591
August1st to 10thDay
53%12%14%18%4
2492
11th to 20thDay
47%10%15%21%7%
2342
21st to endDay
46%9%13%21%10%
2376
September1st to 10thDay
43%8%15%23%10%1
2160
11th to 20thDay
45%7%14%24%9%1
2098
21st to endDay
48%7%12%24%9%
1980
October1st to 10thDay
55%7%12%17%8%1
1836
11th to 20thDay
64%7%11%13%31
1754
21st to endDay
67%5%9%12%6%1
1782
November1st to 10thDay
57%7%11%16%8%
1671
11th to 20thDay
67%5%9%12%7%1
1577
21st to endDay
70%6%8%10%5%1
1520
December1st to 10thDay
71%6%8%10%5%
1520
11th to 20thDay
66%5%10%12%7%
1906
21st to endDay
69%6%7%11%7%
2772
January1st to 10thNight
73%47%11%4
2649
11th to 20thNight
66%6%9%11%6%2
2602
21st to endNight
58%6%9%13%13%1
2772
February1st to 10thNight
62%6%9%15%7%2
2400
11th to 20thNight
63%6%9%13%8%1
2213
21st to endNight
57%6%8%16%12%1
1776
March1st to 10thNight
62%5%9%14%8%2
2160
11th to 20thNight
59%5%8%14%11%2
2084
21st to endNight
53%5%8%19%12%3
1990
April1st to 10thNight
59%6%8%14%10%2
1800
11th to 20thNight
47%7%10%21%13%2
1775
21st to endNight
53%5%9%20%12%2
1642
May1st to 10thNight
50%5%10%19%13%3
1440
11th to 20thNight
48%6%11%19%13%3
1416
21st to endNight
47%7%12%20%11%2
1551
June1st to 10thNight
49%8%13%19%10%1
1440
11th to 20thNight
47%8%12%21%10%3
1440
21st to endNight
46%8%15%19%11%
1440
July1st to 10thNight
40%10%18%22%8%1
1400
11th to 20thNight
40%10%16%27%7%1
1392
21st to endNight
40%11%18%24%8%
1486
August1st to 10thNight
39%11%20%25%5%
1422
11th to 20thNight
40%11%17%24%7%
1539
21st to endNight
42%9%17%24%8%
1980
September1st to 10thNight
41%8%17%23%12%
1800
11th to 20thNight
41%8%15%28%8%1
1862
21st to endNight
43%7%14%26%10%
1980
October1st to 10thNight
48%5%11%24%10%1
2120
11th to 20thNight
58%7%12%17%5%
2204
21st to endNight
63%6%10%14%6%1
2574
November1st to 10thNight
57%8%12%17%6%1
2407
11th to 20thNight
61%8%10%13%6%2
2601
21st to endNight
68%6%10%12%4
2660
December1st to 10thNight
73%6%9%9%4
2660
11th to 20thNight
68%6%7%11%8%1
3288
21st to endNight
71%6%6%12%5%
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%29%34%14%2
180
11th to 20thDay
26%16%38%14%5%1
170
21st to endDay
20%26%35%14%6%
176
February1st to 10thDay
30%32%33%5%1
212
11th to 20thDay
28%25%38%9%
301
21st to endDay
32%27%26%12%3
346
March1st to 10thDay
25%20%37%14%3
420
11th to 20thDay
27%25%31%13%31
420
21st to endDay
30%23%25%15%5%2
462
April1st to 10thDay
29%21%31%13%5%
420
11th to 20thDay
32%23%21%12%10%1
412
21st to endDay
30%21%31%11%5%1
420
May1st to 10thDay
31%21%29%14%41
423
11th to 20thDay
25%21%31%16%5%2
447
21st to endDay
27%20%31%16%41
485
June1st to 10thDay
28%18%34%14%5%1
450
11th to 20thDay
21%19%31%16%10%2
450
21st to endDay
26%14%33%20%6%2
450
July1st to 10thDay
15%14%40%22%7%2
445
11th to 20thDay
17%15%35%27%5%2
444
21st to endDay
15%11%36%26%10%1
488
August1st to 10thDay
17%13%31%26%10%2
446
11th to 20thDay
16%10%30%28%11%5%
439
21st to endDay
18%17%31%17%11%6%
495
September1st to 10thDay
20%16%30%19%10%5%
450
11th to 20thDay
20%14%27%22%12%4
450
21st to endDay
24%14%28%18%10%5%
450
October1st to 10thDay
25%18%28%16%10%3
450
11th to 20thDay
29%23%25%15%6%2
426
21st to endDay
33%18%30%15%4
396
November1st to 10thDay
32%20%28%16%41
365
11th to 20thDay
31%25%30%9%5%
237
21st to endDay
34%28%26%8%31
180
December1st to 10thDay
32%18%30%13%7%1
180
11th to 20thDay
33%27%27%11%21
180
21st to endDay
33%25%27%10%41
198
January1st to 10thNight
23%21%38%13%4
760
11th to 20thNight
21%21%36%17%5%
744
21st to endNight
15%17%41%22%5%
792
February1st to 10thNight
17%22%39%17%41
720
11th to 20thNight
21%21%37%17%31
703
21st to endNight
22%19%37%18%3
592
March1st to 10thNight
27%18%31%19%4
720
11th to 20thNight
25%22%30%17%5%1
720
21st to endNight
22%17%32%23%6%1
792
April1st to 10thNight
30%15%27%23%4
720
11th to 20thNight
23%18%30%20%9%
711
21st to endNight
29%16%29%20%6%
562
May1st to 10thNight
25%14%28%23%9%1
360
11th to 20thNight
26%9%32%25%7%1
354
21st to endNight
20%13%39%21%7%
389
June1st to 10thNight
22%9%36%26%7%
360
11th to 20thNight
20%9%30%29%11%1
360
21st to endNight
19%8%26%33%13%1
360
July1st to 10thNight
14%6%35%36%9%1
350
11th to 20thNight
15%433%32%16%1
348
21st to endNight
12%6%31%38%12%1
394
August1st to 10thNight
13%7%21%43%16%
358
11th to 20thNight
16%5%25%33%20%1
475
21st to endNight
20%10%28%26%14%3
792
September1st to 10thNight
20%9%26%32%11%1
720
11th to 20thNight
21%8%29%26%15%1
720
21st to endNight
23%11%28%24%13%2
720
October1st to 10thNight
23%15%28%23%10%1
720
11th to 20thNight
30%16%28%18%8%1
720
21st to endNight
31%16%27%21%5%
792
November1st to 10thNight
25%20%31%17%6%1
740
11th to 20thNight
24%19%32%16%8%1
760
21st to endNight
29%23%26%17%5%1
760
December1st to 10thNight
29%19%31%16%5%1
760
11th to 20thNight
28%19%32%14%6%1
760
21st to endNight
31%21%30%14%3
836
Page generated at 2024-01-13 09:37:57. Version ac07

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