Muskoka District Municipality
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Muskoka District Municipality clear sky chart from 2005-11-05 to 2017-11-30.

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
29%
15099
13%
47539
8%
15065
35%
15065
16%
34599

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
11%
787
5%
2574
1%
784
15%
784
5%
2188
January16th to endNight
19%
768
11%
2511
5%
768
25%
768
9%
2017
February1st to 15thNight
15%
702
9%
2287
3%
701
23%
701
8%
1846
February16th to endNight
19%
631
11%
2039
5%
631
26%
631
11%
1563
March1st to 15thNight
19%
720
11%
1980
4%
720
25%
720
15%
1497
March16th to endNight
31%
768
19%
2112
11%
768
38%
768
24%
1428
April1st to 15thNight
23%
718
14%
1811
6%
718
28%
718
19%
1359
April16th to endNight
30%
546
18%
1626
9%
546
37%
546
20%
1121
May1st to 15thNight
38%
450
16%
1530
13%
450
45%
450
21%
1000
May16th to endNight
39%
374
14%
1497
12%
374
50%
374
22%
873
June1st to 15thNight
40%
360
9%
1377
9%
360
46%
360
17%
885
June16th to endNight
46%
360
11%
1260
11%
360
51%
360
22%
808
July1st to 15thNight
56%
340
16%
1215
19%
340
60%
340
32%
661
July16th to endNight
51%
435
14%
1472
14%
408
55%
408
26%
878
August1st to 15thNight
57%
539
16%
1609
13%
536
60%
536
30%
1007
August16th to endNight
53%
612
19%
1758
10%
612
59%
612
32%
1090
September1st to 15thNight
45%
720
15%
1800
7%
720
48%
720
30%
1206
September16th to endNight
47%
717
22%
2010
15%
717
52%
717
29%
1301
October1st to 15thNight
30%
720
15%
2160
10%
720
38%
720
18%
1540
October16th to endNight
20%
768
10%
2304
5%
768
27%
768
11%
1834
November1st to 15thNight
28%
760
14%
2635
13%
760
34%
760
14%
1892
November16th to endNight
18%
780
10%
2728
6%
780
24%
780
9%
2158
December1st to 15thNight
11%
720
5%
2520
2%
720
16%
720
6%
2145
December16th to endNight
11%
804
8%
2724
3%
804
16%
804
6%
2302

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%46%5%34446%30%
48855
Night
18%11%47%5%34445%30%
47707
Cloud CoverDay
18%10%46%5%34446%30%
48865
Night
18%11%47%5%34445%30%
47712
TransparencyDay
54%410%19%9%
48541
Night
55%410%18%9%
47539
SeeingDay
24%12%28%21%9%3
5926
Night
24%11%28%24%10%1
15104

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%17%8%10%6%3333418%
1356
16th to endDay
14%19%8%10%7%3433419%
1710
February1st to 15thDay
14%17%7%14%7%3434418%
1575
16th to endDay
16%19%6%10%6%34335%21%
1431
March1st to 15thDay
16%12%5%8%6%34445%28%
1969
16th to endDay
13%9%46%5%34446%36%
2112
April1st to 15thDay
22%11%35%434335%31%
2143
16th to endDay
21%9%3442334438%
2340
May1st to 15thDay
20%8%25%5%33447%32%
2419
16th to endDay
16%5%245%25%5%5%7%38%
2618
June1st to 15thDay
20%7%36%425%46%8%30%
2580
16th to endDay
18%6%25%5%25%46%8%33%
2700
July1st to 15thDay
14%5%345%245%5%9%38%
2671
16th to endDay
13%5%35%5%35%5%6%9%36%
2593
August1st to 15thDay
13%6%25%5%36%45%7%37%
2340
16th to endDay
14%5%26%5%345%5%8%36%
2432
September1st to 15thDay
19%6%26%5%34447%36%
2157
16th to endDay
18%7%244335%45%39%
1950
October1st to 15thDay
26%7%26%5%33435%31%
1800
16th to endDay
33%9%36%5%23445%21%
1920
November1st to 15thDay
22%12%37%6%33446%24%
1550
16th to endDay
24%17%5%6%6%3344418%
1558
December1st to 15thDay
22%23%7%8%5%2323316%
1440
16th to endDay
21%22%8%10%43433315%
1491
January1st to 15thNight
21%17%8%12%7%3333315%
2574
16th to endNight
14%16%9%11%7%3344420%
2511
February1st to 15thNight
12%16%7%13%7%36%43419%
2285
16th to endNight
16%15%7%9%5%3443424%
2039
March1st to 15thNight
17%11%5%8%7%3443430%
1968
16th to endNight
14%9%46%413345%41%
2112
April1st to 15thNight
22%12%45%423335%31%
1811
16th to endNight
17%8%25%6%34447%35%
1626
May1st to 15thNight
19%8%35%3245%5%7%36%
1530
16th to endNight
13%5%24426%45%8%42%
1495
June1st to 15thNight
16%7%25%3246%5%8%36%
1377
16th to endNight
14%6%245%345%6%7%38%
1260
July1st to 15thNight
11%32433345%5%51%
1287
16th to endNight
11%5%24335%5%5%8%43%
1573
August1st to 15thNight
10%5%245%345%5%8%44%
1620
16th to endNight
12%425%32445%7%46%
1758
September1st to 15thNight
14%435%43345%8%42%
1800
16th to endNight
15%5%25%423445%45%
2010
October1st to 15thNight
22%7%26%5%23446%33%
2160
16th to endNight
28%11%47%433335%23%
2304
November1st to 15thNight
21%12%35%32345%6%30%
2635
16th to endNight
25%15%5%5%5%24345%20%
2728
December1st to 15thNight
23%22%7%8%5%2343414%
2520
16th to endNight
23%21%8%8%5%3333414%
2724

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%17%8%10%6%3234417%
1356
16th to endDay
14%19%9%10%7%34335%18%
1710
February1st to 15thDay
14%17%7%14%8%3433418%
1575
16th to endDay
16%18%7%9%6%4433420%
1431
March1st to 15thDay
16%13%47%7%34445%27%
1980
16th to endDay
13%9%46%7%24435%36%
2111
April1st to 15thDay
23%11%45%43333431%
2143
16th to endDay
21%9%3442334437%
2340
May1st to 15thDay
20%8%35%5%3445%7%32%
2419
16th to endDay
16%5%25%43445%7%38%
2618
June1st to 15thDay
20%7%36%325%46%8%30%
2580
16th to endDay
18%6%25%5%35%5%5%9%32%
2700
July1st to 15thDay
14%435%4345%5%9%38%
2671
16th to endDay
13%5%25%5%35%6%7%8%35%
2593
August1st to 15thDay
13%7%26%5%35%46%7%37%
2340
16th to endDay
14%5%25%5%35%5%6%7%37%
2432
September1st to 15thDay
19%6%25%5%24446%37%
2157
16th to endDay
19%6%24335%446%39%
1950
October1st to 15thDay
26%8%26%5%33335%31%
1800
16th to endDay
33%10%36%5%24345%21%
1920
November1st to 15thDay
22%12%37%5%34445%25%
1550
16th to endDay
23%17%5%7%6%24445%17%
1558
December1st to 15thDay
22%22%7%9%5%2332415%
1440
16th to endDay
20%22%7%10%5%2432315%
1491
January1st to 15thNight
21%17%8%12%7%3432315%
2574
16th to endNight
14%16%8%12%7%24345%19%
2511
February1st to 15thNight
12%16%7%12%7%45%5%35%18%
2278
16th to endNight
17%14%7%9%6%3433424%
2039
March1st to 15thNight
18%11%5%8%6%3443430%
1980
16th to endNight
15%8%36%423345%40%
2112
April1st to 15thNight
22%11%44423345%31%
1811
16th to endNight
18%8%25%5%34446%36%
1626
May1st to 15thNight
19%7%3432445%8%36%
1530
16th to endNight
13%424425%6%5%8%42%
1495
June1st to 15thNight
17%6%35%4346%5%7%36%
1377
16th to endNight
14%6%345%345%6%7%39%
1260
July1st to 15thNight
10%4244245%5%6%51%
1287
16th to endNight
11%4244245%5%7%44%
1573
August1st to 15thNight
10%5%245%35%45%8%44%
1620
16th to endNight
11%5%25%43445%7%46%
1758
September1st to 15thNight
14%6%344235%6%7%42%
1800
16th to endNight
15%5%245%24445%45%
2010
October1st to 15thNight
21%7%36%434446%33%
2160
16th to endNight
28%11%46%5%33335%24%
2304
November1st to 15thNight
20%11%35%424445%30%
2635
16th to endNight
25%15%5%6%5%24345%20%
2728
December1st to 15thNight
23%21%7%8%5%2344313%
2520
16th to endNight
22%20%8%9%5%2333415%
2724

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
71%39%10%5%
1357
16th to endDay
69%26%10%8%1
1710
February1st to 15thDay
70%27%13%4
1577
16th to endDay
67%36%13%8%
1431
March1st to 15thDay
58%5%12%16%7%
1980
16th to endDay
49%39%19%15%2
2112
April1st to 15thDay
56%37%18%12%1
2143
16th to endDay
49%37%22%14%2
2340
May1st to 15thDay
51%49%20%12%1
2419
16th to endDay
43%6%11%23%13%1
2622
June1st to 15thDay
51%5%10%22%10%
2580
16th to endDay
47%6%14%19%11%1
2700
July1st to 15thDay
39%7%12%25%13%1
2514
16th to endDay
43%6%11%26%10%
2431
August1st to 15thDay
44%6%14%21%11%
2327
16th to endDay
44%6%14%25%8%
2432
September1st to 15thDay
47%413%23%9%
2157
16th to endDay
45%6%11%28%7%
1950
October1st to 15thDay
56%49%19%10%
1800
16th to endDay
66%410%12%5%
1920
November1st to 15thDay
59%5%12%14%6%
1550
16th to endDay
69%310%11%31
1558
December1st to 15thDay
74%29%9%3
1440
16th to endDay
74%36%10%4
1491
January1st to 15thNight
75%38%8%4
2574
16th to endNight
67%36%12%8%
2511
February1st to 15thNight
68%48%13%5%
2287
16th to endNight
63%39%16%7%
2039
March1st to 15thNight
58%312%16%8%
1980
16th to endNight
46%29%21%17%2
2112
April1st to 15thNight
55%37%19%12%1
1811
16th to endNight
49%47%19%17%2
1626
May1st to 15thNight
45%410%20%15%2
1530
16th to endNight
38%5%14%24%15%1
1497
June1st to 15thNight
46%5%11%21%14%
1377
16th to endNight
42%6%13%24%12%
1260
July1st to 15thNight
30%5%12%30%19%1
1215
16th to endNight
37%5%12%28%14%
1472
August1st to 15thNight
36%6%17%26%12%
1609
16th to endNight
36%5%16%29%11%1
1758
September1st to 15thNight
39%6%16%24%11%
1800
16th to endNight
40%5%12%32%9%
2010
October1st to 15thNight
50%5%10%20%11%
2160
16th to endNight
64%410%13%6%
2304
November1st to 15thNight
54%5%13%18%7%
2635
16th to endNight
66%49%15%3
2728
December1st to 15thNight
73%5%9%8%2
2520
16th to endNight
74%37%8%5%
2724

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%25%36%10%3
60
16th to endDay
43%10%27%15%3
93
February1st to 15thDay
31%31%33%4
90
16th to endDay
40%15%34%9%
84
March1st to 15thDay
25%16%32%19%5%
270
16th to endDay
21%14%34%18%9%2
288
April1st to 15thDay
27%16%28%19%7%1
270
16th to endDay
27%15%26%16%10%3
270
May1st to 15thDay
33%7%25%20%8%5%
288
16th to endDay
21%14%30%19%10%3
331
June1st to 15thDay
24%12%28%24%7%2
375
16th to endDay
19%12%34%23%8%2
495
July1st to 15thDay
16%8%31%27%12%3
448
16th to endDay
15%8%27%29%11%7%
326
August1st to 15thDay
15%228%29%14%9%
313
16th to endDay
20%6%21%23%17%10%
332
September1st to 15thDay
18%7%24%25%14%10%
315
16th to endDay
18%8%22%26%17%6%
314
October1st to 15thDay
26%11%28%21%9%2
315
16th to endDay
38%16%25%14%4
336
November1st to 15thDay
33%14%29%20%3
99
16th to endDay
37%21%28%10%2
90
December1st to 15thDay
38%18%28%13%1
60
16th to endDay
35%43%15%31
64
January1st to 15thNight
32%17%28%16%3
789
16th to endNight
23%13%33%21%7%1
768
February1st to 15thNight
23%17%33%20%5%
704
16th to endNight
26%15%30%19%6%
631
March1st to 15thNight
25%16%32%21%3
720
16th to endNight
20%12%30%25%9%1
768
April1st to 15thNight
28%12%31%21%5%
718
16th to endNight
23%11%29%24%9%1
546
May1st to 15thNight
23%7%24%30%12%1
450
16th to endNight
14%7%32%31%13%
375
June1st to 15thNight
19%7%26%33%13%
360
16th to endNight
17%5%24%39%13%
360
July1st to 15thNight
10%223%42%18%1
340
16th to endNight
12%227%34%22%
435
August1st to 15thNight
13%217%38%24%3
539
16th to endNight
13%424%31%23%3
612
September1st to 15thNight
17%5%25%29%17%4
720
16th to endNight
18%5%23%29%20%3
717
October1st to 15thNight
25%8%29%24%11%1
720
16th to endNight
35%13%26%18%5%
768
November1st to 15thNight
29%11%24%25%9%
760
16th to endNight
35%12%26%18%5%
780
December1st to 15thNight
34%18%29%13%3
720
16th to endNight
34%13%29%17%3
804
Page generated at 2017-12-01 12:13:45. Version ac04

Copyright 2017 A. Danko


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