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 2017-09-18.

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
41%
15213
10%
46781
7%
15186
45%
15186
18%
33425

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
34%
895
7%
2685
4%
895
36%
895
13%
2095
January16th to endNight
30%
912
15%
2832
7%
912
39%
912
17%
2032
February1st to 15thNight
41%
698
9%
2415
6%
696
46%
696
15%
1729
February16th to endNight
44%
632
13%
2031
13%
632
47%
632
18%
1437
March1st to 15thNight
41%
720
12%
2100
8%
720
45%
720
18%
1550
March16th to endNight
39%
768
9%
2107
5%
767
41%
767
17%
1635
April1st to 15thNight
42%
587
12%
1667
7%
587
45%
587
19%
1220
April16th to endNight
42%
540
11%
1620
9%
540
44%
540
18%
1161
May1st to 15thNight
44%
401
9%
1316
7%
401
47%
401
18%
907
May16th to endNight
39%
374
1%
1309
1%
374
39%
374
15%
946
June1st to 15thNight
40%
360
0%
1260
0%
360
40%
360
13%
942
June16th to endNight
50%
360
0%
1260
0%
360
50%
360
17%
857
July1st to 15thNight
55%
340
0%
1190
0%
340
55%
340
22%
764
July16th to endNight
58%
376
3%
1239
3%
354
59%
354
23%
764
August1st to 15thNight
62%
387
6%
1403
8%
385
64%
385
23%
870
August16th to endNight
59%
573
12%
1719
11%
573
60%
573
27%
1113
September1st to 15thNight
57%
611
15%
1772
11%
611
59%
611
31%
1109
September16th to endNight
52%
667
19%
1847
13%
667
57%
667
36%
1135
October1st to 15thNight
43%
660
16%
1966
10%
660
48%
660
22%
1353
October16th to endNight
39%
717
14%
2301
10%
717
45%
717
18%
1603
November1st to 15thNight
32%
875
14%
2462
9%
875
36%
875
17%
1838
November16th to endNight
29%
900
10%
2700
6%
900
33%
900
13%
2084
December1st to 15thNight
30%
900
8%
2700
6%
900
33%
900
12%
2131
December16th to endNight
37%
960
11%
2880
5%
960
43%
960
16%
2150

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
11%8%47%6%35%5%6%8%31%
48049
Night
9%9%48%7%46%5%6%8%31%
46938
TransparencyDay
48%8%17%18%5%
47699
Night
49%8%16%19%6%
46792
SeeingDay
14%5%22%31%19%6%
6110
Night
13%5%26%35%17%2
15226

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%8%6%6%46%7%25%
1253
16th to endDay
5%11%5%11%9%46%5%47%28%
1404
February1st to 15thDay
8%10%6%9%8%45%5%5%8%27%
1440
16th to endDay
5%11%8%12%8%36%6%7%6%23%
1440
March1st to 15thDay
7%12%5%10%7%36%6%6%8%25%
1860
16th to endDay
11%12%6%10%5%45%5%6%7%23%
2113
April1st to 15thDay
15%9%47%5%345%6%8%29%
2281
16th to endDay
15%10%37%6%35%45%7%29%
2340
May1st to 15thDay
9%8%47%6%36%6%5%8%33%
2634
16th to endDay
18%7%37%5%45%5%5%7%29%
2802
June1st to 15thDay
16%9%48%7%46%5%5%6%25%
2700
16th to endDay
15%6%36%7%45%6%6%7%29%
2700
July1st to 15thDay
11%426%5%35%6%7%9%37%
2700
16th to endDay
10%4245%36%6%7%8%40%
2846
August1st to 15thDay
11%5%25%5%35%6%6%10%36%
2550
16th to endDay
7%6%35%5%35%5%6%9%42%
2483
September1st to 15thDay
12%6%26%5%2445%7%41%
2187
16th to endDay
9%5%25%42446%9%45%
1838
October1st to 15thDay
12%10%46%6%35%35%6%35%
1662
16th to endDay
10%9%45%5%35%5%7%9%32%
1559
November1st to 15thDay
7%12%5%10%6%45%5%5%8%27%
1393
16th to endDay
6%8%8%11%8%45%446%31%
1260
December1st to 15thDay
5%13%6%13%11%48%5%5%7%17%
1260
16th to endDay
6%12%5%8%8%5%8%47%9%23%
1344
January1st to 15thNight
7%10%6%9%9%5%7%6%6%6%23%
2685
16th to endNight
6%10%5%10%8%35%5%6%7%31%
2832
February1st to 15thNight
5%8%5%10%9%5%7%5%5%7%29%
2412
16th to endNight
6%12%5%9%6%36%5%7%8%30%
2031
March1st to 15thNight
7%9%48%7%47%5%7%8%27%
2100
16th to endNight
10%13%5%10%7%46%47%9%20%
2106
April1st to 15thNight
10%9%47%7%45%6%7%6%30%
1667
16th to endNight
15%10%36%5%345%5%7%31%
1620
May1st to 15thNight
10%9%37%6%46%5%5%7%31%
1316
16th to endNight
19%8%48%6%34346%29%
1309
June1st to 15thNight
13%8%47%7%45%6%6%7%25%
1260
16th to endNight
12%5%37%6%36%6%7%9%31%
1260
July1st to 15thNight
11%425%6%25%5%8%11%36%
1260
16th to endNight
8%5%25%5%346%6%10%40%
1323
August1st to 15thNight
10%4145%26%6%8%10%38%
1410
16th to endNight
8%5%15%7%45%6%6%8%39%
1719
September1st to 15thNight
12%415%41445%6%47%
1772
16th to endNight
9%42442345%9%50%
1847
October1st to 15thNight
11%10%38%5%34448%35%
1966
16th to endNight
9%9%27%7%46%6%6%8%32%
2301
November1st to 15thNight
10%11%5%8%7%345%5%6%29%
2462
16th to endNight
6%12%6%10%8%46%5%47%26%
2700
December1st to 15thNight
8%12%7%10%8%46%5%5%8%21%
2700
16th to endNight
311%5%10%8%5%7%6%6%8%25%
2880

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
56%9%14%14%4
1253
16th to endDay
54%7%12%16%7%1
1404
February1st to 15thDay
53%7%18%14%5%
1440
16th to endDay
57%7%11%18%5%
1440
March1st to 15thDay
53%10%15%15%3
1860
16th to endDay
57%7%13%16%4
2114
April1st to 15thDay
51%7%17%16%6%
2281
16th to endDay
52%7%15%15%7%1
2340
May1st to 15thDay
46%8%14%20%9%
2634
16th to endDay
52%7%14%16%8%
2807
June1st to 15thDay
56%8%14%16%4
2700
16th to endDay
49%10%19%16%3
2700
July1st to 15thDay
40%10%23%23%2
2541
16th to endDay
39%10%26%21%2
2667
August1st to 15thDay
41%11%26%18%2
2532
16th to endDay
36%9%24%23%5%
2483
September1st to 15thDay
40%8%18%23%6%1
2187
16th to endDay
34%9%18%28%6%1
1838
October1st to 15thDay
49%6%17%19%6%
1662
16th to endDay
45%10%15%24%4
1559
November1st to 15thDay
51%7%17%18%4
1393
16th to endDay
54%6%16%15%4
1260
December1st to 15thDay
65%7%11%13%2
1260
16th to endDay
55%7%15%15%6%
1344
January1st to 15thNight
57%9%16%12%31
2685
16th to endNight
50%7%14%18%7%1
2832
February1st to 15thNight
52%7%15%16%6%
2423
16th to endNight
49%7%13%18%9%1
2031
March1st to 15thNight
50%9%14%18%6%
2100
16th to endNight
56%7%13%17%5%
2109
April1st to 15thNight
51%7%14%19%7%1
1667
16th to endNight
50%7%12%17%9%2
1620
May1st to 15thNight
48%7%11%19%12%
1317
16th to endNight
54%6%10%18%7%2
1309
June1st to 15thNight
53%10%14%15%5%
1260
16th to endNight
46%9%22%17%3
1260
July1st to 15thNight
38%10%22%22%5%
1190
16th to endNight
37%9%24%25%3
1239
August1st to 15thNight
34%12%27%21%3
1403
16th to endNight
37%8%20%26%6%
1719
September1st to 15thNight
34%7%17%26%10%2
1772
16th to endNight
30%8%18%28%10%3
1847
October1st to 15thNight
46%6%15%23%7%
1966
16th to endNight
46%9%16%22%4
2301
November1st to 15thNight
52%8%12%19%5%1
2462
16th to endNight
57%8%13%13%6%1
2700
December1st to 15thNight
59%8%14%12%4
2700
16th to endNight
53%8%16%16%4
2880

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%123%38%15%8%
60
16th to endDay
3318%45%18%10%
64
February1st to 15thDay
13%225%32%22%2
67
16th to endDay
11%5%25%32%19%7%
99
March1st to 15thDay
14%432%35%11%2
270
16th to endDay
17%428%31%16%1
288
April1st to 15thDay
16%13%23%33%13%1
269
16th to endDay
26%7%19%28%14%4
270
May1st to 15thDay
11%8%21%35%15%7%
453
16th to endDay
17%5%21%29%18%6%
517
June1st to 15thDay
18%5%24%30%15%5%
495
16th to endDay
13%5%23%30%20%6%
495
July1st to 15thDay
10%215%34%29%7%
475
16th to endDay
12%420%31%25%6%
515
August1st to 15thDay
15%115%29%23%14%
372
16th to endDay
9%6%24%31%24%4
332
September1st to 15thDay
16%426%26%17%6%
315
16th to endDay
10%11%27%31%14%4
264
October1st to 15thDay
28%5%21%27%13%2
123
16th to endDay
20%221%33%16%5%
96
November1st to 15thDay
20%226%39%10%1
87
16th to endDay
11%5%33%25%13%11%
60
December1st to 15thDay
6%40%23%25%5%
60
16th to endDay
10%6%23%31%23%4
64
January1st to 15thNight
11%8%31%35%12%2
900
16th to endNight
10%9%33%34%11%1
912
February1st to 15thNight
9%7%23%37%20%1
704
16th to endNight
11%423%36%20%3
632
March1st to 15thNight
10%429%38%14%3
720
16th to endNight
14%327%35%16%2
768
April1st to 15thNight
13%6%26%32%18%1
587
16th to endNight
19%6%20%36%15%2
540
May1st to 15thNight
14%5%22%34%20%2
402
16th to endNight
20%422%28%22%1
375
June1st to 15thNight
18%5%21%35%14%4
360
16th to endNight
14%5%20%30%25%3
360
July1st to 15thNight
14%116%40%26%
340
16th to endNight
9%418%42%22%3
376
August1st to 15thNight
11%117%29%34%5%
387
16th to endNight
10%219%37%28%1
573
September1st to 15thNight
14%217%36%26%2
611
16th to endNight
11%326%40%15%2
667
October1st to 15thNight
17%325%36%15%1
660
16th to endNight
16%429%37%12%
717
November1st to 15thNight
16%6%33%31%10%2
875
16th to endNight
13%8%33%32%10%2
900
December1st to 15thNight
14%8%30%29%13%3
900
16th to endNight
9%430%35%16%4
960
Page generated at 2017-09-19 05:32:21. Version ac04

Copyright 2017 A. Danko


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