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 2005-11-05 to 2017-09-23.

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%
14630
13%
46903
7%
14598
34%
14598
15%
33920

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%
2036
January16th to endNight
17%
768
10%
2688
5%
768
25%
768
10%
2032
February1st to 15thNight
15%
704
10%
2302
2%
701
25%
701
10%
1771
February16th to endNight
18%
631
12%
1912
5%
631
27%
631
11%
1460
March1st to 15thNight
16%
720
13%
2154
6%
720
24%
720
12%
1657
March16th to endNight
27%
768
19%
1995
7%
768
36%
768
21%
1384
April1st to 15thNight
23%
718
16%
1796
5%
718
29%
718
19%
1337
April16th to endNight
24%
633
16%
1713
6%
633
32%
633
19%
1214
May1st to 15thNight
24%
363
14%
1443
9%
363
36%
363
14%
993
May16th to endNight
27%
375
13%
1497
9%
374
41%
374
16%
983
June1st to 15thNight
28%
360
7%
1440
5%
360
35%
360
13%
1008
June16th to endNight
38%
360
8%
1440
10%
360
43%
360
16%
949
July1st to 15thNight
49%
340
12%
1360
16%
340
56%
340
24%
783
July16th to endNight
50%
376
11%
1418
13%
354
55%
354
23%
840
August1st to 15thNight
51%
368
13%
1439
12%
366
57%
366
20%
912
August16th to endNight
48%
745
19%
1891
10%
745
52%
745
33%
1212
September1st to 15thNight
42%
720
14%
1800
6%
720
46%
720
28%
1254
September16th to endNight
45%
689
21%
1878
13%
689
50%
689
30%
1210
October1st to 15thNight
30%
660
18%
1964
10%
660
39%
660
18%
1380
October16th to endNight
22%
704
11%
2247
6%
704
30%
704
12%
1707
November1st to 15thNight
24%
700
17%
2292
9%
700
34%
700
14%
1654
November16th to endNight
20%
720
12%
2520
8%
720
27%
720
9%
1935
December1st to 15thNight
14%
720
9%
2520
3%
720
21%
720
7%
2041
December16th to endNight
11%
768
10%
2688
3%
768
19%
768
6%
2168

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
19%10%47%6%34446%29%
48009
Night
17%10%46%5%34446%32%
47072
Cloud CoverDay
18%9%47%6%3445%6%30%
48018
Night
16%9%46%5%34446%32%
47078
TransparencyDay
54%6%10%18%9%1
47696
Night
52%7%10%19%9%1
46903
SeeingDay
24%15%29%20%7%2
5554
Night
22%14%29%23%8%
14630

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%16%6%9%7%4443419%
1432
16th to endDay
12%16%6%9%6%35%45%425%
1536
February1st to 15thDay
13%15%5%10%10%25%346%22%
1559
16th to endDay
15%18%5%8%6%245%4424%
1560
March1st to 15thDay
16%13%5%10%7%3433426%
1793
16th to endDay
16%10%36%42335%6%36%
2229
April1st to 15thDay
22%11%45%5%23345%32%
2152
16th to endDay
21%9%36%424445%33%
2252
May1st to 15thDay
22%9%47%5%245%46%28%
2511
16th to endDay
23%8%35%6%34446%30%
2618
June1st to 15thDay
23%7%36%5%35%46%7%25%
2520
16th to endDay
22%7%36%5%35%5%5%6%26%
2520
July1st to 15thDay
16%5%36%6%35%5%5%7%34%
2520
16th to endDay
14%6%26%6%45%6%6%8%30%
2654
August1st to 15thDay
16%6%37%6%45%6%5%7%29%
2508
16th to endDay
12%5%26%6%35%45%8%39%
2298
September1st to 15thDay
19%6%35%5%25%437%36%
2160
16th to endDay
18%6%23423336%45%
1919
October1st to 15thDay
24%9%25%5%33435%31%
1664
16th to endDay
27%11%37%6%34345%22%
1625
November1st to 15thDay
17%9%46%5%35%46%6%29%
1563
16th to endDay
24%12%36%5%2334427%
1440
December1st to 15thDay
22%18%6%7%425%33420%
1440
16th to endDay
21%16%8%10%5%2343419%
1536
January1st to 15thNight
16%17%6%9%7%35%446%18%
2506
16th to endNight
10%14%7%9%7%34446%25%
2688
February1st to 15thNight
11%14%6%9%8%45%45%5%24%
2300
16th to endNight
14%13%6%9%6%3445%6%26%
1912
March1st to 15thNight
17%11%5%8%5%45%445%27%
2141
16th to endNight
14%9%45%425%345%40%
1995
April1st to 15thNight
24%9%4442433434%
1796
16th to endNight
19%7%25%424436%36%
1713
May1st to 15thNight
20%7%47%5%2343434%
1443
16th to endNight
20%6%345%3335%7%36%
1495
June1st to 15thNight
23%8%36%42445%7%29%
1440
16th to endNight
19%5%15%445%5%5%7%36%
1440
July1st to 15thNight
11%6%2443446%9%43%
1440
16th to endNight
10%5%24426%47%8%42%
1514
August1st to 15thNight
10%5%36%5%345%6%9%39%
1449
16th to endNight
11%414433347%49%
1891
September1st to 15thNight
14%6%35%42446%6%41%
1800
16th to endNight
17%423313445%48%
1878
October1st to 15thNight
17%7%37%5%34436%36%
1964
16th to endNight
26%9%35%5%24346%27%
2247
November1st to 15thNight
19%8%37%5%345%5%6%30%
2292
16th to endNight
20%13%47%6%34336%26%
2520
December1st to 15thNight
20%15%6%7%6%35%445%20%
2520
16th to endNight
21%16%5%7%7%3343420%
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%24435%20%
1432
16th to endDay
11%16%5%8%7%35%445%26%
1536
February1st to 15thDay
12%14%5%10%8%45%445%22%
1559
16th to endDay
14%17%5%8%6%3444425%
1560
March1st to 15thDay
16%13%410%7%3434426%
1803
16th to endDay
15%10%36%5%2435%6%36%
2228
April1st to 15thDay
23%9%35%5%23345%32%
2152
16th to endDay
20%9%35%5%34345%34%
2252
May1st to 15thDay
21%9%37%6%34436%28%
2511
16th to endDay
22%7%35%6%35%446%30%
2618
June1st to 15thDay
22%7%36%6%45%46%7%25%
2520
16th to endDay
21%7%37%6%35%5%6%6%26%
2520
July1st to 15thDay
15%6%35%6%46%46%7%34%
2520
16th to endDay
13%6%37%6%45%7%7%8%30%
2654
August1st to 15thDay
14%6%37%6%46%6%6%7%30%
2508
16th to endDay
11%5%25%6%35%46%8%40%
2298
September1st to 15thDay
19%6%25%5%335%46%37%
2160
16th to endDay
17%5%34323336%45%
1919
October1st to 15thDay
23%8%36%5%23445%32%
1664
16th to endDay
24%12%47%6%34346%22%
1625
November1st to 15thDay
16%8%46%6%345%5%6%30%
1563
16th to endDay
24%11%45%5%34445%27%
1440
December1st to 15thDay
22%16%6%7%5%24435%20%
1440
16th to endDay
21%15%7%8%6%2344321%
1536
January1st to 15thNight
15%15%7%9%7%35%446%19%
2506
16th to endNight
9%14%7%9%6%45%445%27%
2688
February1st to 15thNight
10%14%5%10%8%45%45%6%24%
2293
16th to endNight
14%12%5%8%7%25%445%28%
1912
March1st to 15thNight
17%10%5%8%7%35%45%5%27%
2154
16th to endNight
13%9%36%5%33345%41%
1995
April1st to 15thNight
23%8%3443433435%
1796
16th to endNight
20%6%26%5%24446%37%
1713
May1st to 15thNight
19%8%37%5%2443435%
1443
16th to endNight
20%6%345%24348%36%
1495
June1st to 15thNight
22%8%35%5%335%47%30%
1440
16th to endNight
18%6%235%345%5%8%35%
1440
July1st to 15thNight
11%5%24425%46%9%43%
1440
16th to endNight
10%5%245%26%5%6%7%42%
1514
August1st to 15thNight
10%5%25%5%35%46%10%38%
1449
16th to endNight
11%41443435%7%49%
1891
September1st to 15thNight
14%5%25%4345%5%6%42%
1800
16th to endNight
17%414313346%48%
1878
October1st to 15thNight
17%7%36%5%3345%6%36%
1964
16th to endNight
24%8%35%5%3435%6%29%
2247
November1st to 15thNight
18%8%37%6%245%46%32%
2292
16th to endNight
19%13%47%5%24435%28%
2520
December1st to 15thNight
19%14%5%7%6%3435%6%22%
2520
16th to endNight
21%14%6%7%6%34435%22%
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
67%6%7%12%5%
1433
16th to endDay
60%6%7%15%8%1
1536
February1st to 15thDay
63%47%17%5%
1561
16th to endDay
61%5%7%15%9%1
1560
March1st to 15thDay
62%48%14%9%1
1803
16th to endDay
48%48%18%15%4
2229
April1st to 15thDay
54%47%18%12%3
2152
16th to endDay
52%5%6%18%12%3
2252
May1st to 15thDay
56%47%17%12%1
2511
16th to endDay
54%5%9%17%10%1
2622
June1st to 15thDay
55%8%9%15%9%1
2520
16th to endDay
55%7%9%18%7%1
2520
July1st to 15thDay
45%7%13%24%9%
2371
16th to endDay
49%8%14%18%8%
2487
August1st to 15thDay
50%9%14%19%5%
2494
16th to endDay
41%7%15%24%10%
2298
September1st to 15thDay
46%6%11%23%11%
2160
16th to endDay
41%5%11%31%10%
1919
October1st to 15thDay
53%5%9%20%9%
1664
16th to endDay
64%6%10%13%5%
1625
November1st to 15thDay
52%8%14%14%9%
1563
16th to endDay
59%6%10%16%5%
1440
December1st to 15thDay
66%7%9%12%3
1440
16th to endDay
67%6%7%10%8%
1536
January1st to 15thNight
65%8%8%11%4
2506
16th to endNight
57%8%9%14%8%1
2688
February1st to 15thNight
60%6%9%17%5%
2302
16th to endNight
57%7%9%14%9%1
1912
March1st to 15thNight
57%7%7%16%9%1
2154
16th to endNight
45%5%10%17%17%3
1995
April1st to 15thNight
53%46%20%13%1
1796
16th to endNight
48%5%9%17%15%2
1713
May1st to 15thNight
52%5%8%16%13%3
1443
16th to endNight
47%6%9%21%13%1
1497
June1st to 15thNight
53%6%11%19%9%
1440
16th to endNight
46%7%10%20%12%1
1440
July1st to 15thNight
35%7%16%27%12%
1360
16th to endNight
36%8%18%24%11%
1418
August1st to 15thNight
40%10%17%23%8%
1439
16th to endNight
33%7%16%31%11%
1891
September1st to 15thNight
40%8%12%26%11%
1800
16th to endNight
36%6%11%32%11%
1878
October1st to 15thNight
48%6%10%22%11%
1964
16th to endNight
56%8%10%17%7%
2247
November1st to 15thNight
51%7%11%18%7%2
2292
16th to endNight
59%8%7%17%6%
2520
December1st to 15thNight
64%8%8%14%3
2520
16th to endNight
65%7%7%11%6%
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
25%21%33%16%3
60
16th to endDay
29%26%31%7%31
64
February1st to 15thDay
39%26%28%41
87
16th to endDay
26%22%28%18%3
219
March1st to 15thDay
26%21%30%19%2
270
16th to endDay
24%19%30%15%7%2
288
April1st to 15thDay
33%20%24%14%6%1
270
16th to endDay
24%19%28%17%7%1
270
May1st to 15thDay
33%16%26%15%6%1
288
16th to endDay
28%16%30%18%6%
331
June1st to 15thDay
27%14%34%17%5%
315
16th to endDay
24%11%36%20%5%1
315
July1st to 15thDay
18%11%37%22%7%2
305
16th to endDay
15%7%31%34%9%2
326
August1st to 15thDay
17%7%29%27%15%2
313
16th to endDay
15%10%27%25%13%8%
332
September1st to 15thDay
21%9%23%25%14%5%
315
16th to endDay
18%12%21%22%15%9%
283
October1st to 15thDay
26%17%23%20%9%2
255
16th to endDay
32%16%26%17%6%
247
November1st to 15thDay
20%21%29%21%6%1
217
16th to endDay
35%18%31%15%
60
December1st to 15thDay
30%28%25%15%1
60
16th to endDay
35%34%25%4
64
January1st to 15thNight
26%19%33%16%4
720
16th to endNight
18%19%35%20%5%1
768
February1st to 15thNight
17%21%37%18%4
704
16th to endNight
22%19%33%19%3
631
March1st to 15thNight
24%18%35%19%2
720
16th to endNight
19%17%31%23%6%1
768
April1st to 15thNight
28%15%28%23%4
718
16th to endNight
25%17%29%19%7%
633
May1st to 15thNight
24%10%33%22%7%1
363
16th to endNight
22%10%34%24%6%
375
June1st to 15thNight
26%9%28%28%6%
360
16th to endNight
23%326%32%13%
360
July1st to 15thNight
12%10%25%33%16%1
340
16th to endNight
13%326%40%14%1
376
August1st to 15thNight
13%322%38%20%1
368
16th to endNight
13%7%25%31%20%2
745
September1st to 15thNight
16%7%27%32%13%1
720
16th to endNight
19%9%23%25%19%2
689
October1st to 15thNight
22%13%29%25%9%
660
16th to endNight
31%15%27%19%6%
704
November1st to 15thNight
23%17%29%20%7%1
700
16th to endNight
27%21%24%18%7%1
720
December1st to 15thNight
30%20%27%16%4
720
16th to endNight
30%20%30%14%3
768
Page generated at 2017-09-24 09:15:44. Version ac04

Copyright 2017 A. Danko


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