Miquelon Lake Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Miquelon Lake Provincial Park clear sky chart from 2005-11-05 to 2018-10-08.

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
42%
16571
10%
50935
7%
16544
45%
16544
18%
36301

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
35%
970
7%
2910
4%
970
37%
970
14%
2241
January16th to endNight
30%
988
15%
3068
8%
988
38%
988
17%
2214
February1st to 15thNight
41%
758
10%
2621
7%
756
46%
756
15%
1884
February16th to endNight
45%
684
13%
2198
12%
684
48%
684
19%
1549
March1st to 15thNight
43%
780
14%
2275
10%
780
47%
780
19%
1655
March16th to endNight
38%
832
8%
2283
5%
831
40%
831
16%
1786
April1st to 15thNight
43%
636
12%
1806
7%
636
46%
636
20%
1309
April16th to endNight
44%
579
10%
1737
9%
579
46%
579
19%
1231
May1st to 15thNight
45%
434
10%
1425
8%
434
48%
434
19%
977
May16th to endNight
40%
406
1%
1421
1%
406
40%
406
15%
1015
June1st to 15thNight
40%
390
0%
1365
0%
390
40%
390
13%
1022
June16th to endNight
51%
390
0%
1365
0%
390
51%
390
18%
919
July1st to 15thNight
54%
370
0%
1295
0%
370
54%
370
22%
835
July16th to endNight
60%
408
3%
1351
2%
386
61%
386
24%
826
August1st to 15thNight
63%
413
7%
1496
9%
411
64%
411
23%
929
August16th to endNight
58%
621
13%
1863
12%
621
60%
621
27%
1216
September1st to 15thNight
56%
662
14%
1920
10%
662
58%
662
30%
1230
September16th to endNight
50%
776
18%
2145
12%
776
54%
776
32%
1367
October1st to 15thNight
44%
752
14%
2238
9%
752
49%
752
22%
1538
October16th to endNight
39%
782
14%
2510
9%
782
45%
782
18%
1735
November1st to 15thNight
31%
950
13%
2673
8%
950
36%
950
16%
2029
November16th to endNight
29%
975
10%
2925
5%
975
33%
975
14%
2252
December1st to 15thNight
32%
975
9%
2925
6%
975
35%
975
13%
2245
December16th to endNight
38%
1040
12%
3120
6%
1040
44%
1040
17%
2297

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
10%8%47%6%35%5%6%8%32%
52235
Night
9%9%48%7%46%5%6%8%31%
51092
TransparencyDay
48%8%17%19%5%
51885
Night
48%8%15%19%6%
50946
SeeingDay
15%5%22%31%19%6%
7479
Night
13%5%26%35%17%2
16584

By Month

Percentage Cloud Cover NW (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
5%12%5%10%9%6%6%46%8%25%
1358
16th to endDay
5%11%5%11%9%46%5%47%28%
1521
February1st to 15thDay
8%10%6%8%8%45%5%48%27%
1564
16th to endDay
5%10%8%11%9%36%6%7%6%24%
1559
March1st to 15thDay
6%13%5%9%7%46%6%6%8%24%
2015
16th to endDay
11%13%6%11%5%45%46%7%23%
2289
April1st to 15thDay
14%10%47%5%445%6%8%28%
2472
16th to endDay
15%10%37%5%35%45%7%31%
2498
May1st to 15thDay
9%7%46%6%35%6%5%8%34%
2854
16th to endDay
17%7%37%5%35%45%7%32%
3042
June1st to 15thDay
16%8%47%7%46%5%5%7%25%
2925
16th to endDay
14%6%35%7%45%6%6%7%31%
2925
July1st to 15thDay
10%426%5%35%6%7%9%37%
2925
16th to endDay
9%4245%36%6%7%8%41%
3086
August1st to 15thDay
11%5%25%5%35%6%6%10%37%
2709
16th to endDay
7%6%25%5%35%5%6%9%43%
2691
September1st to 15thDay
13%6%26%5%2445%7%39%
2369
16th to endDay
11%6%25%5%2446%8%42%
2145
October1st to 15thDay
12%11%47%6%35%35%6%33%
1889
16th to endDay
10%10%45%5%35%6%7%8%31%
1701
November1st to 15thDay
7%12%6%11%7%445%5%8%25%
1512
16th to endDay
6%8%7%11%8%45%446%30%
1365
December1st to 15thDay
5%13%5%13%11%47%5%47%20%
1365
16th to endDay
5%11%5%8%8%5%8%48%9%23%
1456
January1st to 15thNight
6%10%5%9%9%5%8%6%6%6%25%
2910
16th to endNight
6%10%5%10%8%35%5%5%7%30%
3068
February1st to 15thNight
5%8%5%10%9%5%7%6%5%6%29%
2618
16th to endNight
5%11%5%8%6%46%5%7%8%30%
2198
March1st to 15thNight
7%8%48%7%47%5%7%8%29%
2275
16th to endNight
11%13%5%10%7%36%47%8%20%
2282
April1st to 15thNight
10%8%37%7%45%6%7%6%31%
1806
16th to endNight
15%10%36%5%346%5%7%32%
1737
May1st to 15thNight
10%9%37%6%46%5%5%7%32%
1425
16th to endNight
19%7%48%5%34446%30%
1421
June1st to 15thNight
14%9%47%7%45%6%6%7%25%
1365
16th to endNight
11%5%37%6%36%6%7%9%32%
1365
July1st to 15thNight
11%425%6%25%5%8%10%36%
1365
16th to endNight
8%5%25%5%346%6%10%41%
1435
August1st to 15thNight
10%4145%26%6%8%10%39%
1503
16th to endNight
8%5%15%7%45%5%6%8%39%
1863
September1st to 15thNight
13%5%25%4145%5%6%45%
1920
16th to endNight
10%5%25%42345%8%46%
2145
October1st to 15thNight
12%9%37%5%3445%8%35%
2238
16th to endNight
9%8%27%7%46%6%6%8%32%
2510
November1st to 15thNight
10%13%5%9%7%35%5%5%6%27%
2673
16th to endNight
6%11%6%10%8%46%5%47%26%
2925
December1st to 15thNight
8%12%6%9%8%46%5%5%8%23%
2925
16th to endNight
310%5%10%8%5%7%6%6%9%25%
3120

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
55%9%13%14%5%
1358
16th to endDay
54%7%12%16%8%1
1521
February1st to 15thDay
53%7%17%15%5%
1564
16th to endDay
56%6%12%18%5%
1559
March1st to 15thDay
54%9%15%15%4
2015
16th to endDay
58%7%13%16%4
2290
April1st to 15thDay
52%7%16%16%6%
2472
16th to endDay
51%6%15%17%7%1
2498
May1st to 15thDay
44%7%15%22%9%
2854
16th to endDay
50%7%13%18%9%
3047
June1st to 15thDay
56%8%14%17%4
2925
16th to endDay
47%10%19%18%3
2925
July1st to 15thDay
40%10%22%23%3
2766
16th to endDay
38%10%25%23%2
2907
August1st to 15thDay
40%11%26%19%2
2691
16th to endDay
35%9%23%24%5%
2691
September1st to 15thDay
41%8%18%22%6%1
2369
16th to endDay
39%8%18%25%6%1
2145
October1st to 15thDay
51%6%17%18%5%
1889
16th to endDay
45%10%15%23%4
1701
November1st to 15thDay
54%7%16%16%4
1512
16th to endDay
54%7%17%16%4
1365
December1st to 15thDay
62%7%11%14%3
1365
16th to endDay
53%7%14%15%8%
1456
January1st to 15thNight
56%9%16%12%41
2910
16th to endNight
51%6%14%18%7%1
3068
February1st to 15thNight
52%7%15%17%6%
2629
16th to endNight
48%8%14%19%8%1
2198
March1st to 15thNight
49%8%14%19%7%
2275
16th to endNight
57%7%12%16%5%
2285
April1st to 15thNight
50%7%13%19%8%1
1806
16th to endNight
48%8%12%18%9%2
1737
May1st to 15thNight
47%7%10%20%12%
1426
16th to endNight
53%6%10%19%7%2
1421
June1st to 15thNight
54%9%14%16%4
1365
16th to endNight
45%9%21%18%4
1365
July1st to 15thNight
39%10%21%23%5%
1295
16th to endNight
36%9%23%26%3
1351
August1st to 15thNight
35%12%26%21%3
1496
16th to endNight
38%8%19%26%6%
1863
September1st to 15thNight
36%8%17%25%10%2
1920
16th to endNight
34%8%18%26%10%2
2145
October1st to 15thNight
46%6%16%23%7%
2238
16th to endNight
45%9%17%21%5%
2510
November1st to 15thNight
54%7%12%18%5%1
2673
16th to endNight
56%8%14%13%6%
2925
December1st to 15thNight
56%8%15%14%4
2925
16th to endNight
51%8%16%15%7%
3120

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
13%222%36%20%5%
90
16th to endDay
6%416%45%17%9%
96
February1st to 15thDay
14%226%33%17%3
101
16th to endDay
7%325%36%20%5%
140
March1st to 15thDay
13%429%33%14%5%
330
16th to endDay
19%327%29%17%2
352
April1st to 15thDay
16%10%24%31%13%3
329
16th to endDay
26%7%17%27%17%4
318
May1st to 15thDay
11%7%21%36%15%7%
527
16th to endDay
17%421%30%18%6%
597
June1st to 15thDay
18%5%23%30%15%5%
570
16th to endDay
12%5%22%27%22%9%
570
July1st to 15thDay
11%216%35%27%6%
550
16th to endDay
11%318%31%24%10%
595
August1st to 15thDay
14%115%29%24%14%
421
16th to endDay
9%5%22%31%23%6%
396
September1st to 15thDay
19%425%26%17%6%
375
16th to endDay
17%9%24%29%14%4
375
October1st to 15thDay
28%425%24%15%2
196
16th to endDay
20%9%23%28%13%3
144
November1st to 15thDay
16%229%39%9%3
131
16th to endDay
8%5%41%26%10%7%
90
December1st to 15thDay
8%8%28%26%23%3
90
16th to endDay
7%429%33%21%4
96
January1st to 15thNight
10%8%30%35%13%2
975
16th to endNight
11%9%32%33%11%1
988
February1st to 15thNight
9%6%24%38%19%1
764
16th to endNight
10%424%36%20%3
684
March1st to 15thNight
9%427%38%16%3
780
16th to endNight
15%326%35%15%3
832
April1st to 15thNight
13%6%25%32%19%2
636
16th to endNight
18%6%20%36%16%2
579
May1st to 15thNight
15%5%21%35%19%2
435
16th to endNight
19%422%29%21%1
407
June1st to 15thNight
19%5%21%35%14%3
390
16th to endNight
13%420%30%26%4
390
July1st to 15thNight
14%117%40%24%
370
16th to endNight
9%417%41%23%3
408
August1st to 15thNight
11%116%30%34%4
413
16th to endNight
10%219%37%28%1
621
September1st to 15thNight
15%217%36%25%2
662
16th to endNight
13%325%38%16%2
776
October1st to 15thNight
17%225%37%15%1
752
16th to endNight
15%430%36%11%
782
November1st to 15thNight
16%6%32%30%10%2
950
16th to endNight
12%7%34%32%10%2
975
December1st to 15thNight
13%8%29%30%14%2
975
16th to endNight
8%431%36%15%3
1040
Page generated at 2018-10-09 08:39:17. Version ac04

Copyright 2018 A. Danko


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