Riviere-du-Loup
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Riviere-du-Loup 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
25%
22834
11%
74907
6%
22789
31%
22789
13%
55723

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%
830
6%
2796
1%
827
16%
827
6%
2361
January11th to 20thNight
15%
744
9%
2602
4%
744
23%
744
9%
2043
January21st to endNight
23%
792
14%
2772
7%
792
33%
792
12%
2031
February1st to 10thNight
15%
720
10%
2466
3%
720
26%
720
11%
1843
February11th to 20thNight
14%
702
8%
2208
2%
700
22%
700
9%
1749
February21st to endNight
21%
592
15%
1776
7%
592
31%
592
15%
1328
March1st to 10thNight
21%
720
14%
2160
7%
720
30%
720
15%
1639
March11th to 20thNight
19%
720
12%
2012
6%
720
24%
720
13%
1573
March21st to endNight
24%
792
15%
2127
6%
792
31%
792
17%
1610
April1st to 10thNight
21%
720
13%
1800
4%
720
26%
720
15%
1440
April11th to 20thNight
27%
544
16%
1608
9%
544
32%
544
17%
1156
April21st to endNight
28%
540
16%
1620
8%
540
35%
540
17%
1171
May1st to 10thNight
29%
540
12%
1620
7%
540
36%
540
17%
1210
May11th to 20thNight
33%
372
16%
1395
14%
372
45%
372
17%
923
May21st to endNight
27%
388
11%
1357
7%
388
35%
388
15%
954
June1st to 10thNight
32%
360
7%
1260
6%
360
35%
360
15%
889
June11th to 20thNight
39%
360
10%
1260
8%
360
43%
360
19%
837
June21st to endNight
28%
360
6%
1260
4%
360
31%
360
16%
893
July1st to 10thNight
36%
350
9%
1225
6%
350
42%
350
18%
825
July11th to 20thNight
44%
348
10%
1299
10%
348
49%
348
19%
844
July21st to endNight
43%
394
8%
1486
11%
372
48%
372
16%
1001
August1st to 10thNight
47%
398
11%
1462
12%
396
51%
396
19%
963
August11th to 20thNight
43%
532
10%
1596
8%
532
45%
532
21%
1114
August21st to endNight
42%
594
17%
1782
12%
594
44%
594
25%
1171
September1st to 10thNight
36%
707
14%
1823
6%
707
40%
707
26%
1266
September11th to 20thNight
32%
720
12%
1980
5%
720
37%
720
23%
1377
September21st to endNight
35%
720
18%
1980
11%
720
41%
720
26%
1337
October1st to 10thNight
29%
720
19%
2027
9%
720
38%
720
23%
1388
October11th to 20thNight
26%
720
10%
2268
5%
720
31%
720
14%
1712
October21st to endNight
22%
792
11%
2574
4%
792
30%
792
13%
1917
November1st to 10thNight
19%
740
12%
2407
5%
740
27%
740
12%
1824
November11th to 20thNight
19%
832
12%
2622
7%
832
26%
832
11%
1985
November21st to endNight
17%
850
8%
2797
3%
850
23%
850
8%
2208
December1st to 10thNight
13%
850
7%
2850
1%
850
20%
850
8%
2319
December11th to 20thNight
15%
849
7%
3471
2%
848
20%
848
5%
2888
December21st to endNight
13%
922
6%
5159
3%
907
20%
907
4%
3934

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%10%47%6%35%5%5%7%32%
74606
Night
18%12%5%8%7%35%5%5%6%27%
75203
TransparencyDay
53%413%21%8%1
74299
Night
59%411%18%7%1
75045
SeeingDay
25%12%30%22%9%2
14558
Night
26%11%29%25%8%1
22850

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%6%9%8%46%7%5%6%14%
1367
11th to 20thDay
13%16%7%11%8%46%5%6%6%17%
1480
21st to endDay
10%10%5%10%8%47%5%6%8%26%
1584
February1st to 10thDay
8%14%6%10%9%6%7%6%6%8%22%
1493
11th to 20thDay
14%15%7%9%8%46%446%23%
1636
21st to endDay
13%11%5%8%7%46%5%5%6%29%
1480
March1st to 10thDay
16%11%5%7%5%46%5%6%6%28%
1797
11th to 20thDay
15%14%5%7%7%45%45%6%29%
1947
21st to endDay
16%14%48%5%345%45%32%
2227
April1st to 10thDay
21%12%47%6%335%5%7%26%
2160
11th to 20thDay
20%8%36%5%2345%6%38%
2301
21st to endDay
23%9%46%424446%34%
2340
May1st to 10thDay
21%7%45%5%4445%5%35%
2340
11th to 20thDay
17%8%37%5%34447%38%
2515
21st to endDay
19%7%35%43446%8%37%
2919
June1st to 10thDay
19%8%46%5%35%5%5%7%33%
2700
11th to 20thDay
19%5%36%435%5%5%8%37%
2700
21st to endDay
20%7%37%6%45%5%5%7%30%
2700
July1st to 10thDay
15%7%36%6%35%6%8%9%34%
2700
11th to 20thDay
12%6%37%6%46%6%7%7%37%
2615
21st to endDay
12%8%36%6%345%7%8%38%
2744
August1st to 10thDay
15%6%36%5%46%6%7%9%32%
2448
11th to 20thDay
14%6%35%5%345%7%9%39%
2304
21st to endDay
14%6%36%6%35%5%6%9%38%
2574
September1st to 10thDay
16%6%25%5%345%5%9%40%
2134
11th to 20thDay
17%7%2442335%6%46%
1980
21st to endDay
18%5%25%5%3445%6%43%
1980
October1st to 10thDay
17%7%36%6%35%5%5%8%35%
1932
11th to 20thDay
24%7%36%6%345%6%6%28%
1691
21st to endDay
25%12%46%5%33445%28%
1782
November1st to 10thDay
18%12%5%6%6%35%5%5%6%28%
1671
11th to 20thDay
20%13%5%8%7%345%6%6%24%
1556
21st to endDay
19%16%5%8%6%3445%5%24%
1380
December1st to 10thDay
21%14%6%10%8%5%5%5%46%18%
1330
11th to 20thDay
20%18%48%8%44446%20%
1668
21st to endDay
22%14%5%7%7%3443428%
2431
January1st to 10thNight
15%18%7%12%10%46%5%5%5%13%
2796
11th to 20thNight
16%15%6%9%8%46%5%5%6%20%
2602
21st to endNight
9%13%7%10%8%5%6%5%6%7%25%
2772
February1st to 10thNight
11%13%6%10%9%46%5%6%6%25%
2466
11th to 20thNight
13%17%7%12%8%35%5%5%422%
2205
21st to endNight
14%14%6%10%8%34346%27%
1776
March1st to 10thNight
16%13%6%8%7%45%45%6%27%
2150
11th to 20thNight
16%16%5%8%7%45%45%6%25%
2011
21st to endNight
18%14%46%5%35%5%46%31%
2127
April1st to 10thNight
24%14%47%5%34445%26%
1800
11th to 20thNight
22%9%47%6%34445%33%
1608
21st to endNight
26%9%35%433345%32%
1620
May1st to 10thNight
25%9%37%6%35%45%5%29%
1620
11th to 20thNight
22%9%36%6%24436%36%
1394
21st to endNight
24%9%36%5%345%5%6%31%
1356
June1st to 10thNight
19%9%37%7%45%5%5%7%28%
1260
11th to 20thNight
18%7%37%5%3446%7%36%
1260
21st to endNight
22%10%37%6%345%5%7%28%
1260
July1st to 10thNight
20%6%37%6%35%5%6%8%32%
1260
11th to 20thNight
14%6%36%8%46%6%5%9%33%
1341
21st to endNight
14%6%45%6%47%6%8%8%30%
1574
August1st to 10thNight
13%7%36%7%46%6%7%8%35%
1472
11th to 20thNight
15%7%36%8%36%6%7%9%29%
1596
21st to endNight
15%7%37%5%2446%9%38%
1782
September1st to 10thNight
16%7%36%5%45%45%7%38%
1823
11th to 20thNight
19%8%36%5%34445%38%
1980
21st to endNight
17%8%35%424446%43%
1980
October1st to 10thNight
18%8%36%5%2435%6%40%
2027
11th to 20thNight
25%10%46%6%35%45%5%27%
2268
21st to endNight
24%9%47%5%3445%7%27%
2574
November1st to 10thNight
21%12%48%6%3445%6%28%
2407
11th to 20thNight
20%13%5%7%6%3445%6%27%
2622
21st to endNight
19%16%6%9%6%445%5%6%21%
2797
December1st to 10thNight
22%16%7%9%7%4445%5%18%
2850
11th to 20thNight
19%16%5%9%8%46%6%6%6%15%
3531
21st to endNight
18%16%5%9%7%35%5%4423%
5236

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
71%6%10%11%2
1368
11th to 20thDay
69%39%15%31
1480
21st to endDay
57%49%20%10%
1584
February1st to 10thDay
61%314%14%7%1
1493
11th to 20thDay
65%211%16%6%
1644
21st to endDay
56%38%21%11%1
1480
March1st to 10thDay
57%48%19%10%2
1800
11th to 20thDay
59%310%18%10%1
1947
21st to endDay
57%38%21%9%2
2227
April1st to 10thDay
59%410%16%10%2
2160
11th to 20thDay
50%311%24%11%2
2301
21st to endDay
54%37%21%13%2
2340
May1st to 10thDay
53%211%20%13%1
2340
11th to 20thDay
48%311%24%12%1
2519
21st to endDay
47%5%12%24%10%1
2919
June1st to 10thDay
52%411%20%12%1
2700
11th to 20thDay
46%5%15%21%12%1
2700
21st to endDay
53%414%20%8%1
2700
July1st to 10thDay
46%419%24%7%
2625
11th to 20thDay
45%5%16%25%8%1
2534
21st to endDay
45%5%18%24%8%1
2591
August1st to 10thDay
47%6%20%23%4
2434
11th to 20thDay
43%419%27%7%
2304
21st to endDay
44%416%27%8%
2574
September1st to 10thDay
42%416%27%10%
2134
11th to 20thDay
41%416%27%11%1
1980
21st to endDay
45%315%26%10%
1980
October1st to 10thDay
49%413%23%11%
1932
11th to 20thDay
58%5%15%19%4
1691
21st to endDay
62%311%18%5%
1782
November1st to 10thDay
59%412%20%5%1
1671
11th to 20thDay
63%49%19%5%
1556
21st to endDay
65%5%12%14%4
1380
December1st to 10thDay
72%310%12%3
1330
11th to 20thDay
68%37%17%4
1668
21st to endDay
64%313%16%41
2431
January1st to 10thNight
74%48%11%3
2796
11th to 20thNight
65%410%15%6%
2602
21st to endNight
59%47%22%8%
2772
February1st to 10thNight
60%412%16%8%1
2466
11th to 20thNight
67%39%14%7%
2208
21st to endNight
60%28%21%8%1
1776
March1st to 10thNight
61%38%20%7%1
2160
11th to 20thNight
64%29%16%8%1
2012
21st to endNight
58%38%21%9%2
2127
April1st to 10thNight
63%36%14%11%3
1800
11th to 20thNight
55%38%19%14%1
1608
21st to endNight
56%36%21%13%2
1620
May1st to 10thNight
59%28%17%12%1
1620
11th to 20thNight
52%29%23%13%2
1395
21st to endNight
55%310%18%13%2
1357
June1st to 10thNight
55%411%19%10%1
1260
11th to 20thNight
48%5%11%20%14%3
1260
21st to endNight
55%414%17%10%
1260
July1st to 10thNight
49%5%17%23%5%
1225
11th to 20thNight
47%5%17%23%8%1
1299
21st to endNight
50%6%17%20%7%
1486
August1st to 10thNight
47%6%19%25%4
1462
11th to 20thNight
49%5%19%20%7%
1596
21st to endNight
45%416%27%8%
1782
September1st to 10thNight
47%313%26%10%1
1823
11th to 20thNight
49%315%22%9%1
1980
21st to endNight
45%412%27%12%1
1980
October1st to 10thNight
48%312%25%10%1
2027
11th to 20thNight
61%313%19%4
2268
21st to endNight
59%312%19%6%
2574
November1st to 10thNight
61%413%16%6%
2407
11th to 20thNight
60%5%12%17%6%
2622
21st to endNight
66%413%13%4
2797
December1st to 10thNight
70%311%13%3
2850
11th to 20thNight
71%5%8%14%2
3532
21st to endNight
68%311%14%4
5236

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
25%18%35%17%31
180
11th to 20thDay
24%16%36%18%5%1
170
21st to endDay
18%19%34%18%10%2
176
February1st to 10thDay
21%23%29%23%41
213
11th to 20thDay
23%19%38%19%2
364
21st to endDay
23%16%34%20%7%1
346
March1st to 10thDay
25%12%33%24%5%1
420
11th to 20thDay
26%15%28%21%7%3
420
21st to endDay
27%16%30%18%6%3
462
April1st to 10thDay
29%17%26%21%5%2
420
11th to 20thDay
28%13%28%24%5%2
412
21st to endDay
28%14%31%19%6%3
420
May1st to 10thDay
29%13%30%18%9%2
423
11th to 20thDay
23%12%30%24%9%2
486
21st to endDay
25%14%34%19%7%1
680
June1st to 10thDay
27%10%30%23%9%1
630
11th to 20thDay
26%7%29%24%11%2
630
21st to endDay
24%5%29%28%13%1
630
July1st to 10thDay
21%10%28%29%11%1
620
11th to 20thDay
16%6%34%27%15%3
533
21st to endDay
18%6%31%31%13%2
488
August1st to 10thDay
19%10%27%29%13%3
446
11th to 20thDay
18%6%27%32%15%2
439
21st to endDay
19%11%27%24%13%6%
495
September1st to 10thDay
20%10%27%26%13%5%
450
11th to 20thDay
24%10%29%24%10%4
450
21st to endDay
24%11%29%22%8%5%
450
October1st to 10thDay
21%12%31%23%10%3
426
11th to 20thDay
34%13%24%17%10%2
360
21st to endDay
35%13%29%16%6%2
396
November1st to 10thDay
33%15%31%18%21
365
11th to 20thDay
31%15%28%18%6%2
370
21st to endDay
33%17%32%16%3
230
December1st to 10thDay
26%18%35%12%6%2
180
11th to 20thDay
32%18%33%14%21
180
21st to endDay
32%23%21%21%4
198
January1st to 10thNight
25%16%32%20%6%1
830
11th to 20thNight
25%15%32%22%5%
744
21st to endNight
17%12%35%28%8%1
792
February1st to 10thNight
18%15%38%23%5%1
720
11th to 20thNight
24%15%32%22%6%1
703
21st to endNight
22%14%32%24%7%1
592
March1st to 10thNight
22%11%36%22%8%1
720
11th to 20thNight
28%13%33%18%8%1
720
21st to endNight
27%14%29%23%6%2
792
April1st to 10thNight
34%9%30%21%6%1
720
11th to 20thNight
29%9%27%26%9%
544
21st to endNight
33%9%26%24%8%1
540
May1st to 10thNight
30%8%25%29%8%1
540
11th to 20thNight
26%7%24%33%9%1
372
21st to endNight
30%9%27%24%9%1
389
June1st to 10thNight
24%6%24%37%8%1
360
11th to 20thNight
22%6%23%36%13%1
360
21st to endNight
26%426%32%11%1
360
July1st to 10thNight
21%6%28%33%11%1
350
11th to 20thNight
19%5%24%39%14%1
348
21st to endNight
18%424%39%14%1
394
August1st to 10thNight
18%320%41%17%1
398
11th to 20thNight
18%325%38%14%1
532
21st to endNight
18%7%25%34%14%2
594
September1st to 10thNight
21%6%27%32%12%2
707
11th to 20thNight
25%6%28%28%11%3
720
21st to endNight
23%6%29%30%10%2
720
October1st to 10thNight
26%8%30%26%8%2
720
11th to 20thNight
33%10%24%23%9%1
720
21st to endNight
31%10%28%22%8%
792
November1st to 10thNight
33%12%29%20%6%
740
11th to 20thNight
30%16%28%19%7%1
832
21st to endNight
29%15%30%20%5%
850
December1st to 10thNight
31%12%32%18%6%1
850
11th to 20thNight
28%17%31%19%5%
850
21st to endNight
29%16%28%21%6%1
935
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