Radar de Saint-Adolphe-d'Howard
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Radar de Saint-Adolphe-d'Howard clear sky chart from 2005-11-06 to 2024-01-14.

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%
22501
13%
74735
7%
22461
34%
22461
14%
53970

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
11%
760
8%
2649
2%
757
18%
757
7%
2165
January11th to 20thNight
15%
735
10%
2569
4%
735
23%
735
8%
2012
January21st to endNight
17%
792
13%
2772
7%
792
26%
792
12%
2024
February1st to 10thNight
13%
720
11%
2362
2%
720
24%
720
10%
1827
February11th to 20thNight
13%
703
12%
2214
3%
700
25%
700
10%
1669
February21st to endNight
18%
592
15%
1776
6%
592
29%
592
13%
1324
March1st to 10thNight
16%
720
15%
2160
7%
720
25%
720
12%
1645
March11th to 20thNight
19%
720
14%
2064
4%
720
28%
720
14%
1518
March21st to endNight
25%
792
20%
2003
7%
792
34%
792
19%
1437
April1st to 10thNight
21%
720
15%
1800
4%
720
27%
720
18%
1358
April11th to 20thNight
25%
711
17%
1775
5%
711
32%
711
22%
1274
April21st to endNight
23%
591
16%
1671
6%
591
30%
591
17%
1207
May1st to 10thNight
25%
365
15%
1445
10%
365
37%
365
16%
968
May11th to 20thNight
28%
354
19%
1416
14%
354
44%
354
17%
913
May21st to endNight
26%
389
13%
1551
7%
388
41%
388
17%
988
June1st to 10thNight
29%
360
9%
1440
7%
360
39%
360
16%
962
June11th to 20thNight
37%
360
10%
1440
11%
360
45%
360
17%
923
June21st to endNight
40%
360
10%
1440
12%
360
46%
360
16%
958
July1st to 10thNight
46%
350
13%
1400
16%
350
55%
350
23%
817
July11th to 20thNight
47%
348
13%
1392
17%
348
53%
348
21%
838
July21st to endNight
47%
394
13%
1486
13%
372
52%
372
22%
896
August1st to 10thNight
53%
358
14%
1422
14%
356
59%
356
21%
864
August11th to 20thNight
49%
518
17%
1582
11%
518
55%
518
27%
1030
August21st to endNight
43%
792
18%
1980
8%
792
47%
792
29%
1325
September1st to 10thNight
42%
720
16%
1800
6%
720
46%
720
30%
1208
September11th to 20thNight
46%
720
20%
1854
11%
720
51%
720
33%
1214
September21st to endNight
40%
720
22%
1980
14%
720
46%
720
27%
1321
October1st to 10thNight
33%
720
19%
2133
11%
720
42%
720
20%
1485
October11th to 20thNight
25%
720
14%
2181
7%
720
33%
720
16%
1604
October21st to endNight
21%
792
11%
2574
5%
792
29%
792
13%
1948
November1st to 10thNight
24%
740
14%
2407
7%
740
33%
740
13%
1738
November11th to 20thNight
19%
760
15%
2590
9%
760
28%
760
12%
1908
November21st to endNight
17%
760
10%
2660
5%
760
24%
760
8%
2070
December1st to 10thNight
14%
760
9%
2660
3%
760
20%
760
6%
2185
December11th to 20thNight
14%
760
11%
3248
4%
759
23%
759
6%
2521
December21st to endNight
11%
825
7%
4839
3%
817
18%
817
4%
3826

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%35%5%5%6%30%
74757
Night
17%11%47%6%3445%6%32%
74991
TransparencyDay
53%7%10%18%10%1
74462
Night
52%8%10%19%10%1
74820
SeeingDay
25%19%30%18%6%2
13398
Night
23%16%30%23%8%1
22512

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%18%7%12%8%5%5%43419%
1517
11th to 20thDay
16%18%5%10%7%34436%23%
1464
21st to endDay
10%15%7%10%7%35%6%5%5%27%
1584
February1st to 10thDay
12%18%5%11%10%35%446%22%
1597
11th to 20thDay
13%18%6%10%7%45%445%26%
1632
21st to endDay
16%17%6%10%7%35%435%24%
1480
March1st to 10thDay
14%14%6%10%7%35%445%28%
1797
11th to 20thDay
16%13%49%7%35%45%5%29%
1894
21st to endDay
18%11%47%5%3445%6%34%
2352
April1st to 10thDay
21%12%5%6%6%33445%31%
2160
11th to 20thDay
21%9%46%5%34445%34%
2134
21st to endDay
22%10%5%7%5%35%5%45%29%
2297
May1st to 10thDay
20%9%47%6%35%45%6%31%
2520
11th to 20thDay
20%8%36%6%345%5%6%33%
2478
21st to endDay
20%7%46%6%45%5%5%6%34%
2725
June1st to 10thDay
23%8%36%6%36%5%6%7%27%
2520
11th to 20thDay
16%7%37%6%45%5%6%7%33%
2520
21st to endDay
23%8%37%6%45%6%5%6%27%
2520
July1st to 10thDay
14%5%36%6%45%6%6%7%37%
2520
11th to 20thDay
15%6%36%6%46%6%7%9%33%
2520
21st to endDay
14%7%37%6%5%5%7%7%8%33%
2744
August1st to 10thDay
15%6%37%7%45%6%5%8%33%
2506
11th to 20thDay
14%6%36%6%36%5%8%9%34%
2295
21st to endDay
15%6%36%6%4446%7%38%
2376
September1st to 10thDay
16%6%35%5%25%5%5%8%39%
2160
11th to 20thDay
15%5%36%434447%43%
2106
21st to endDay
20%7%345%2445%6%40%
1980
October1st to 10thDay
23%9%25%6%345%46%33%
1823
11th to 20thDay
24%11%38%6%345%45%26%
1778
21st to endDay
26%12%38%6%34445%24%
1782
November1st to 10thDay
16%11%47%5%35%5%6%6%32%
1671
11th to 20thDay
20%13%6%8%6%35%46%425%
1587
21st to endDay
21%15%5%8%6%35%5%5%5%22%
1520
December1st to 10thDay
21%19%7%9%6%35%43419%
1520
11th to 20thDay
19%14%7%11%6%3444423%
1906
21st to endDay
21%19%7%9%5%2444420%
2772
January1st to 10thNight
15%18%8%12%7%35%5%46%18%
2649
11th to 20thNight
15%18%7%10%8%24446%23%
2569
21st to endNight
10%12%6%10%8%45%45%6%30%
2772
February1st to 10thNight
12%14%6%10%8%45%5%5%6%24%
2362
11th to 20thNight
12%13%6%11%8%35%45%5%27%
2212
21st to endNight
12%14%6%10%6%34446%28%
1776
March1st to 10thNight
14%12%5%10%7%46%445%28%
2150
11th to 20thNight
15%14%5%8%5%45%45%6%29%
2063
21st to endNight
16%10%46%5%35%345%39%
2003
April1st to 10thNight
22%11%46%5%34346%31%
1800
11th to 20thNight
18%7%36%7%345%45%38%
1775
21st to endNight
21%9%37%5%35%5%5%5%33%
1671
May1st to 10thNight
19%9%47%6%34445%35%
1445
11th to 20thNight
18%7%46%6%335%46%39%
1415
21st to endNight
17%7%35%5%3445%8%39%
1550
June1st to 10thNight
20%8%36%5%346%5%9%31%
1440
11th to 20thNight
18%6%35%6%445%5%7%38%
1440
21st to endNight
20%6%25%5%45%5%5%6%37%
1440
July1st to 10thNight
11%7%25%6%335%5%8%45%
1440
11th to 20thNight
13%6%25%5%35%47%8%42%
1440
21st to endNight
12%6%35%5%26%5%6%9%41%
1574
August1st to 10thNight
11%6%26%5%336%6%10%41%
1432
11th to 20thNight
10%6%36%6%3445%7%45%
1582
21st to endNight
15%5%25%5%4445%7%45%
1980
September1st to 10thNight
12%6%45%4345%5%6%46%
1800
11th to 20thNight
15%5%2442446%7%47%
1854
21st to endNight
18%5%244235%5%7%43%
1980
October1st to 10thNight
17%7%47%6%345%45%39%
2133
11th to 20thNight
22%9%37%5%35%45%6%32%
2181
21st to endNight
23%10%46%6%3445%7%28%
2574
November1st to 10thNight
19%9%5%8%5%345%6%7%30%
2407
11th to 20thNight
17%11%5%8%6%45%45%6%29%
2590
21st to endNight
19%15%5%8%7%3445%5%24%
2660
December1st to 10thNight
18%17%7%10%8%45%445%18%
2660
11th to 20thNight
20%14%6%9%7%4444424%
3288
21st to endNight
23%20%5%8%6%33435%21%
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
68%7%7%13%5%
1518
11th to 20thDay
63%6%6%12%10%2
1464
21st to endDay
57%7%7%15%12%2
1584
February1st to 10thDay
63%5%6%16%8%2
1597
11th to 20thDay
61%5%10%14%9%1
1641
21st to endDay
62%5%7%14%9%2
1480
March1st to 10thDay
59%6%7%16%11%2
1800
11th to 20thDay
56%6%10%14%12%3
1894
21st to endDay
52%5%8%18%13%4
2352
April1st to 10thDay
55%5%9%16%11%3
2160
11th to 20thDay
51%6%8%20%13%2
2134
21st to endDay
56%6%6%16%12%4
2297
May1st to 10thDay
54%5%7%19%12%3
2520
11th to 20thDay
50%6%9%18%15%3
2482
21st to endDay
50%6%10%19%13%1
2725
June1st to 10thDay
54%8%8%17%11%1
2520
11th to 20thDay
47%8%11%20%11%3
2520
21st to endDay
56%8%10%16%9%1
2520
July1st to 10thDay
42%8%13%26%10%
2450
11th to 20thDay
45%9%13%24%10%
2445
21st to endDay
46%9%15%21%9%
2591
August1st to 10thDay
46%10%14%23%6%
2492
11th to 20thDay
42%11%15%23%8%
2295
21st to endDay
44%7%13%23%12%1
2376
September1st to 10thDay
42%7%12%25%13%
2160
11th to 20thDay
38%8%13%28%11%1
2106
21st to endDay
45%6%13%26%10%
1980
October1st to 10thDay
50%6%11%21%11%1
1823
11th to 20thDay
60%7%11%16%6%1
1778
21st to endDay
60%8%10%14%7%1
1782
November1st to 10thDay
51%7%14%19%8%1
1671
11th to 20thDay
58%9%11%12%9%
1587
21st to endDay
62%9%12%12%41
1520
December1st to 10thDay
68%8%8%10%5%
1520
11th to 20thDay
62%9%9%13%6%
1906
21st to endDay
68%6%7%12%6%
2772
January1st to 10thNight
66%9%8%12%5%
2649
11th to 20thNight
63%7%9%10%8%2
2569
21st to endNight
53%9%9%15%13%2
2772
February1st to 10thNight
60%7%8%17%7%1
2362
11th to 20thNight
56%8%10%16%9%1
2214
21st to endNight
56%6%9%16%11%2
1776
March1st to 10thNight
58%7%7%16%11%2
2160
11th to 20thNight
54%6%11%14%13%2
2064
21st to endNight
48%5%9%19%15%4
2003
April1st to 10thNight
54%5%8%17%14%2
1800
11th to 20thNight
48%6%9%21%15%2
1775
21st to endNight
51%6%9%18%13%3
1671
May1st to 10thNight
51%48%19%14%4
1445
11th to 20thNight
45%7%9%18%17%3
1416
21st to endNight
43%8%10%21%15%3
1551
June1st to 10thNight
48%8%13%21%11%
1440
11th to 20thNight
46%7%9%23%13%3
1440
21st to endNight
47%8%12%20%13%
1440
July1st to 10thNight
36%8%15%27%13%1
1400
11th to 20thNight
39%8%15%29%9%
1392
21st to endNight
38%8%18%24%11%
1486
August1st to 10thNight
37%10%19%26%9%
1422
11th to 20thNight
37%10%16%27%10%
1582
21st to endNight
38%8%15%27%12%
1980
September1st to 10thNight
38%8%13%27%14%1
1800
11th to 20thNight
36%7%14%32%10%1
1854
21st to endNight
39%8%11%29%12%
1980
October1st to 10thNight
47%7%9%24%12%1
2133
11th to 20thNight
52%8%12%19%8%
2181
21st to endNight
56%9%11%15%8%1
2574
November1st to 10thNight
52%8%14%19%7%1
2407
11th to 20thNight
53%10%11%16%8%2
2590
21st to endNight
60%9%10%14%6%1
2660
December1st to 10thNight
67%8%8%13%4
2660
11th to 20thNight
62%8%7%15%7%1
3288
21st to endNight
67%7%7%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
20%26%37%14%4
180
11th to 20thDay
27%23%34%9%7%1
166
21st to endDay
22%26%34%13%5%1
176
February1st to 10thDay
39%32%25%4
230
11th to 20thDay
27%33%33%7%1
299
21st to endDay
30%25%29%14%2
346
March1st to 10thDay
27%23%33%14%3
420
11th to 20thDay
27%24%31%14%31
420
21st to endDay
31%22%24%16%6%1
462
April1st to 10thDay
32%20%30%13%4
420
11th to 20thDay
34%19%24%14%8%1
412
21st to endDay
30%21%30%14%31
420
May1st to 10thDay
27%22%30%15%41
423
11th to 20thDay
25%20%32%18%5%1
447
21st to endDay
24%21%33%17%5%
485
June1st to 10thDay
27%18%34%15%6%
450
11th to 20thDay
19%21%32%19%8%1
450
21st to endDay
26%15%33%18%7%2
450
July1st to 10thDay
16%11%35%26%10%2
445
11th to 20thDay
16%14%36%27%7%1
444
21st to endDay
14%12%36%27%9%1
488
August1st to 10thDay
17%11%29%28%13%1
446
11th to 20thDay
15%10%27%30%13%5%
439
21st to endDay
18%17%28%19%11%6%
495
September1st to 10thDay
18%13%32%22%10%5%
450
11th to 20thDay
14%15%29%22%13%7%
450
21st to endDay
22%16%24%23%11%5%
450
October1st to 10thDay
26%20%23%19%10%2
450
11th to 20thDay
28%22%27%17%5%1
439
21st to endDay
35%15%30%16%4
396
November1st to 10thDay
30%19%29%17%41
365
11th to 20thDay
27%26%32%12%4
247
21st to endDay
31%26%31%12%1
180
December1st to 10thDay
30%22%30%13%5%
180
11th to 20thDay
30%28%29%12%11
180
21st to endDay
33%28%25%10%31
198
January1st to 10thNight
24%20%35%18%3
760
11th to 20thNight
25%22%28%19%4
735
21st to endNight
17%19%38%20%6%1
792
February1st to 10thNight
19%24%35%18%31
720
11th to 20thNight
21%22%37%16%4
703
21st to endNight
23%19%33%22%3
592
March1st to 10thNight
22%20%35%19%3
720
11th to 20thNight
25%20%32%18%41
720
21st to endNight
22%18%30%23%6%1
792
April1st to 10thNight
28%17%27%23%4
720
11th to 20thNight
23%16%31%23%5%1
711
21st to endNight
27%16%29%19%8%1
591
May1st to 10thNight
24%12%34%21%7%2
365
11th to 20thNight
22%14%30%27%7%1
354
21st to endNight
20%11%38%25%6%
389
June1st to 10thNight
23%8%32%28%8%
360
11th to 20thNight
24%7%25%31%12%1
360
21st to endNight
21%6%26%32%15%1
360
July1st to 10thNight
13%10%27%35%14%1
350
11th to 20thNight
12%7%26%40%15%1
348
21st to endNight
14%6%27%39%13%2
394
August1st to 10thNight
14%5%22%41%17%1
358
11th to 20thNight
12%6%24%32%24%1
518
21st to endNight
17%7%27%31%16%2
792
September1st to 10thNight
13%10%29%33%13%1
720
11th to 20thNight
17%9%23%30%18%1
720
21st to endNight
20%10%25%26%16%2
720
October1st to 10thNight
22%11%30%25%11%1
720
11th to 20thNight
26%14%29%23%8%1
720
21st to endNight
28%16%29%21%5%
792
November1st to 10thNight
25%18%27%22%6%1
740
11th to 20thNight
24%20%30%18%8%1
760
21st to endNight
29%21%26%18%5%1
760
December1st to 10thNight
28%20%30%16%6%
760
11th to 20thNight
29%23%27%16%41
760
21st to endNight
32%20%29%15%3
836
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