Fenelon Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fenelon Falls clear sky chart from 2005-11-05 to 2017-08-12.

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
28%
14608
13%
46483
7%
14574
35%
14574
16%
33080

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%
719
8%
2506
2%
716
18%
716
6%
2051
January16th to endNight
16%
768
10%
2517
5%
768
23%
768
9%
1982
February1st to 15thNight
13%
702
9%
2287
3%
701
21%
701
9%
1812
February16th to endNight
18%
631
14%
2025
4%
631
30%
631
12%
1481
March1st to 15thNight
19%
720
14%
1989
4%
720
27%
720
15%
1468
March16th to endNight
26%
768
20%
2112
9%
768
35%
768
23%
1413
April1st to 15thNight
22%
718
15%
1796
5%
718
27%
718
19%
1353
April16th to endNight
29%
579
19%
1659
8%
579
36%
579
24%
1111
May1st to 15thNight
36%
441
16%
1521
11%
441
44%
441
20%
991
May16th to endNight
39%
375
15%
1497
11%
374
51%
374
23%
861
June1st to 15thNight
38%
360
11%
1440
9%
360
48%
360
18%
890
June16th to endNight
46%
360
11%
1391
12%
360
51%
360
21%
850
July1st to 15thNight
55%
340
15%
1360
20%
340
63%
340
30%
722
July16th to endNight
53%
428
16%
1466
15%
402
60%
402
29%
837
August1st to 15thNight
55%
527
16%
1575
12%
524
60%
524
33%
943
August16th to endNight
52%
583
18%
1633
9%
583
57%
583
33%
1012
September1st to 15thNight
43%
660
17%
1650
8%
660
47%
660
30%
1118
September16th to endNight
48%
657
21%
1834
13%
657
52%
657
29%
1184
October1st to 15thNight
31%
660
16%
1980
11%
660
38%
660
19%
1415
October16th to endNight
17%
704
11%
2112
4%
704
26%
704
10%
1663
November1st to 15thNight
28%
700
16%
2405
13%
700
35%
700
15%
1678
November16th to endNight
19%
720
9%
2520
5%
720
25%
720
9%
1963
December1st to 15thNight
11%
720
6%
2520
2%
720
16%
720
6%
2059
December16th to endNight
9%
768
8%
2688
2%
768
17%
768
6%
2223

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
16%9%36%6%3445%6%32%
47442
Night
16%10%47%6%34446%32%
46658
Cloud CoverDay
16%9%36%6%3445%6%32%
47452
Night
16%9%46%6%34446%32%
46663
TransparencyDay
51%5%11%19%10%
47135
Night
51%5%11%19%10%
46483
SeeingDay
21%12%30%21%10%4
5209
Night
20%14%30%23%10%1
14611

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
18%15%5%9%7%34345%22%
1432
16th to endDay
13%15%7%12%8%33435%20%
1707
February1st to 15thDay
14%14%6%14%9%3443420%
1575
16th to endDay
16%14%410%7%35%33424%
1447
March1st to 15thDay
15%11%47%8%35%445%29%
1959
16th to endDay
15%9%46%434435%38%
2112
April1st to 15thDay
22%9%35%5%2435%5%32%
2152
16th to endDay
19%8%24433336%39%
2310
May1st to 15thDay
17%7%35%5%45%45%6%33%
2427
16th to endDay
13%6%25%5%3445%8%39%
2618
June1st to 15thDay
20%6%25%5%3445%7%33%
2520
16th to endDay
16%6%25%435%47%9%34%
2520
July1st to 15thDay
10%425%436%5%6%8%40%
2520
16th to endDay
10%5%35%6%36%5%6%8%36%
2601
August1st to 15thDay
11%5%35%5%45%5%6%8%38%
2288
16th to endDay
10%5%25%6%35%47%8%39%
2205
September1st to 15thDay
17%6%25%5%3445%7%38%
1980
16th to endDay
16%5%25%5%24435%41%
1793
October1st to 15thDay
21%8%35%6%34445%31%
1650
16th to endDay
29%10%46%5%3335%5%22%
1760
November1st to 15thDay
17%8%48%5%3335%7%31%
1450
16th to endDay
23%13%48%6%345%5%419%
1440
December1st to 15thDay
18%18%7%10%6%34435%17%
1440
16th to endDay
21%16%7%9%6%25%5%35%16%
1536
January1st to 15thNight
19%14%6%11%8%4434417%
2506
16th to endNight
14%16%6%10%7%3445%421%
2517
February1st to 15thNight
13%15%6%10%8%46%445%21%
2285
16th to endNight
15%12%47%6%25%45%6%27%
2025
March1st to 15thNight
18%10%47%5%23436%32%
1977
16th to endNight
15%7%46%414346%40%
2112
April1st to 15thNight
20%10%46%6%23436%32%
1796
16th to endNight
14%8%36%5%2335%7%39%
1659
May1st to 15thNight
15%7%35%43445%6%38%
1521
16th to endNight
11%5%34435%45%6%45%
1495
June1st to 15thNight
16%5%245%25%45%8%38%
1440
16th to endNight
11%5%246%245%5%9%40%
1391
July1st to 15thNight
7%3236%35%446%51%
1440
16th to endNight
9%423336%46%8%46%
1566
August1st to 15thNight
8%3245%2445%8%48%
1586
16th to endNight
9%4236%3445%6%49%
1633
September1st to 15thNight
15%6%25%424447%42%
1650
16th to endNight
15%6%24424346%45%
1834
October1st to 15thNight
19%8%36%5%3335%6%33%
1980
16th to endNight
26%10%37%6%3444424%
2112
November1st to 15thNight
18%9%35%5%2445%6%32%
2405
16th to endNight
22%11%47%6%35%45%5%21%
2520
December1st to 15thNight
20%16%6%9%6%35%445%16%
2520
16th to endNight
22%16%8%10%6%3333416%
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
19%14%5%10%7%33435%22%
1432
16th to endDay
14%15%7%12%8%34335%21%
1707
February1st to 15thDay
13%16%6%13%9%35%34320%
1575
16th to endDay
17%15%49%7%35%33425%
1447
March1st to 15thDay
16%11%5%7%7%35%445%29%
1970
16th to endDay
15%9%35%435%435%38%
2111
April1st to 15thDay
22%8%35%5%33346%32%
2152
16th to endDay
19%8%24423345%40%
2310
May1st to 15thDay
18%7%35%6%35%5%46%34%
2427
16th to endDay
14%6%25%5%3445%7%39%
2618
June1st to 15thDay
20%6%35%5%25%5%6%8%32%
2520
16th to endDay
16%6%26%435%46%9%35%
2520
July1st to 15thDay
10%4345%36%5%6%9%40%
2520
16th to endDay
10%5%25%7%46%5%6%9%36%
2601
August1st to 15thDay
11%6%25%6%35%5%6%8%38%
2288
16th to endDay
11%6%25%5%35%5%6%8%39%
2205
September1st to 15thDay
17%6%245%3445%7%38%
1980
16th to endDay
16%6%25%5%34346%41%
1793
October1st to 15thDay
21%9%37%5%34436%31%
1650
16th to endDay
28%11%35%5%33346%22%
1760
November1st to 15thDay
16%8%46%7%3345%7%32%
1450
16th to endDay
23%14%47%6%3445%5%20%
1440
December1st to 15thDay
17%18%7%10%7%34345%17%
1440
16th to endDay
21%16%8%8%5%34445%17%
1536
January1st to 15thNight
19%15%6%10%9%44345%17%
2506
16th to endNight
14%15%6%9%8%35%345%21%
2517
February1st to 15thNight
13%14%7%10%7%46%435%21%
2278
16th to endNight
16%12%47%6%35%35%6%28%
2025
March1st to 15thNight
19%10%46%5%34335%32%
1989
16th to endNight
15%6%35%5%2335%5%41%
2112
April1st to 15thNight
20%9%46%5%24346%32%
1796
16th to endNight
14%8%35%5%2335%7%39%
1659
May1st to 15thNight
16%7%25%435%446%38%
1521
16th to endNight
12%5%24435%447%45%
1495
June1st to 15thNight
15%6%25%5%2445%9%38%
1440
16th to endNight
11%5%246%35%5%6%7%40%
1391
July1st to 15thNight
8%3235%35%437%51%
1440
16th to endNight
9%5%13336%5%6%8%46%
1566
August1st to 15thNight
8%41442445%8%48%
1586
16th to endNight
8%425%5%35%446%49%
1633
September1st to 15thNight
16%5%25%42345%6%43%
1650
16th to endNight
16%5%24424346%45%
1834
October1st to 15thNight
20%8%36%6%2435%6%34%
1980
16th to endNight
26%9%37%6%2444425%
2112
November1st to 15thNight
18%9%35%5%3445%6%33%
2405
16th to endNight
22%11%47%6%35%5%46%22%
2520
December1st to 15thNight
20%15%6%8%6%35%5%45%17%
2520
16th to endNight
21%16%7%10%6%34335%16%
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
63%5%10%13%6%
1433
16th to endDay
66%47%10%9%1
1707
February1st to 15thDay
67%48%14%4
1577
16th to endDay
62%48%13%9%
1447
March1st to 15thDay
57%414%15%7%
1970
16th to endDay
48%5%7%19%16%2
2112
April1st to 15thDay
53%38%19%13%1
2152
16th to endDay
46%39%23%15%1
2310
May1st to 15thDay
50%5%9%19%13%
2427
16th to endDay
42%5%13%21%14%1
2622
June1st to 15thDay
49%6%11%22%10%
2520
16th to endDay
43%8%14%20%12%
2520
July1st to 15thDay
36%7%14%26%14%
2371
16th to endDay
43%8%12%26%9%1
2438
August1st to 15thDay
41%7%16%21%12%1
2275
16th to endDay
40%6%13%28%9%1
2205
September1st to 15thDay
44%5%15%24%9%
1980
16th to endDay
45%5%11%28%8%
1793
October1st to 15thDay
54%49%20%10%
1650
16th to endDay
62%5%12%12%5%
1760
November1st to 15thDay
51%7%14%16%9%1
1450
16th to endDay
64%6%11%11%5%
1440
December1st to 15thDay
69%5%13%9%2
1440
16th to endDay
69%6%7%12%4
1536
January1st to 15thNight
68%5%7%11%5%
2506
16th to endNight
64%5%8%13%7%
2517
February1st to 15thNight
64%5%9%14%5%
2287
16th to endNight
55%5%11%19%8%
2025
March1st to 15thNight
54%411%19%8%
1989
16th to endNight
43%410%22%16%1
2112
April1st to 15thNight
53%5%7%19%13%1
1796
16th to endNight
43%5%10%19%18%2
1659
May1st to 15thNight
45%5%11%18%15%3
1521
16th to endNight
37%5%12%26%15%2
1497
June1st to 15thNight
43%5%12%22%15%
1440
16th to endNight
39%7%13%22%15%
1391
July1st to 15thNight
30%6%10%31%21%
1360
16th to endNight
32%7%14%30%14%
1466
August1st to 15thNight
32%6%20%25%14%
1575
16th to endNight
34%6%14%28%15%1
1633
September1st to 15thNight
40%6%15%25%11%
1650
16th to endNight
39%410%32%12%
1834
October1st to 15thNight
51%5%10%21%11%
1980
16th to endNight
60%7%10%13%7%
2112
November1st to 15thNight
50%6%13%18%9%1
2405
16th to endNight
61%7%12%12%4
2520
December1st to 15thNight
67%7%11%10%3
2520
16th to endNight
71%48%10%5%
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
21%28%31%13%5%
60
16th to endDay
31%15%37%11%4
93
February1st to 15thDay
31%30%31%7%
90
16th to endDay
33%17%35%11%
106
March1st to 15thDay
25%15%33%21%4
270
16th to endDay
25%14%31%17%7%2
288
April1st to 15thDay
25%17%33%14%7%1
270
16th to endDay
22%15%31%15%11%3
270
May1st to 15thDay
26%10%28%17%9%7%
288
16th to endDay
18%10%37%19%8%4
331
June1st to 15thDay
24%8%31%24%8%2
315
16th to endDay
18%9%27%28%13%3
315
July1st to 15thDay
12%6%26%29%17%7%
305
16th to endDay
9%7%34%28%13%7%
326
August1st to 15thDay
13%5%27%26%16%11%
297
16th to endDay
14%424%25%17%12%
268
September1st to 15thDay
14%7%27%23%16%10%
255
16th to endDay
18%10%22%25%14%8%
254
October1st to 15thDay
18%16%26%21%11%5%
255
16th to endDay
33%17%28%16%4
272
November1st to 15thDay
18%15%28%29%5%2
97
16th to endDay
43%8%33%13%1
60
December1st to 15thDay
20%28%33%10%8%
60
16th to endDay
32%35%28%3
64
January1st to 15thNight
25%24%30%13%5%
720
16th to endNight
22%17%32%22%41
768
February1st to 15thNight
21%21%36%17%3
704
16th to endNight
23%19%33%18%4
631
March1st to 15thNight
25%19%31%20%3
720
16th to endNight
19%14%35%19%10%1
768
April1st to 15thNight
24%16%31%20%5%
718
16th to endNight
17%14%34%23%9%1
579
May1st to 15thNight
19%6%30%27%14%1
441
16th to endNight
12%7%34%32%11%
375
June1st to 15thNight
17%9%27%35%9%
360
16th to endNight
10%6%29%38%15%
360
July1st to 15thNight
7%5%25%40%21%
340
16th to endNight
8%428%37%19%
428
August1st to 15thNight
10%322%35%25%3
527
16th to endNight
10%325%30%26%2
583
September1st to 15thNight
17%5%28%26%18%4
660
16th to endNight
17%7%22%30%17%4
657
October1st to 15thNight
23%11%27%22%12%1
660
16th to endNight
30%17%28%18%5%
704
November1st to 15thNight
21%15%30%22%9%1
700
16th to endNight
26%17%30%18%5%
720
December1st to 15thNight
29%25%28%12%4
720
16th to endNight
28%21%31%15%21
768
Page generated at 2017-08-13 14:16:59. Version ac04

Copyright 2017 A. Danko


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