Upper Kananaskis Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Upper Kananaskis Lake clear sky chart from 2005-11-05 to 2017-09-15.

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
24%
15106
8%
46780
4%
15073
29%
15073
13%
34282

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
13%
900
6%
2685
3%
895
16%
895
8%
2200
January16th to endNight
15%
771
10%
2691
6%
771
22%
771
10%
1991
February1st to 15thNight
21%
704
6%
2438
4%
700
23%
700
9%
1838
February16th to endNight
22%
632
8%
1941
5%
632
26%
632
12%
1439
March1st to 15thNight
14%
720
6%
2141
2%
720
19%
720
8%
1693
March16th to endNight
18%
768
6%
2058
1%
768
21%
768
11%
1656
April1st to 15thNight
25%
656
5%
1736
2%
656
27%
656
12%
1360
April16th to endNight
25%
540
8%
1620
5%
540
28%
540
11%
1239
May1st to 15thNight
37%
395
7%
1438
8%
395
40%
395
13%
1003
May16th to endNight
33%
374
4%
1309
3%
374
34%
374
10%
998
June1st to 15thNight
34%
360
1%
1260
0%
360
34%
360
11%
932
June16th to endNight
32%
360
2%
1260
0%
360
32%
360
13%
849
July1st to 15thNight
43%
340
2%
1190
0%
340
44%
340
21%
717
July16th to endNight
47%
376
10%
1329
9%
354
56%
354
25%
727
August1st to 15thNight
55%
378
14%
1450
17%
376
61%
376
24%
826
August16th to endNight
45%
573
20%
1719
14%
573
49%
573
30%
971
September1st to 15thNight
43%
701
15%
1827
8%
701
46%
701
27%
1182
September16th to endNight
35%
656
16%
1815
8%
656
40%
656
22%
1198
October1st to 15thNight
25%
660
12%
1946
6%
660
31%
660
14%
1448
October16th to endNight
24%
704
10%
2288
5%
704
32%
704
12%
1695
November1st to 15thNight
12%
778
8%
2359
2%
778
18%
778
9%
1832
November16th to endNight
14%
900
7%
2700
2%
900
19%
900
10%
2088
December1st to 15thNight
18%
900
6%
2700
4%
900
20%
900
9%
2142
December16th to endNight
12%
960
7%
2880
2%
960
17%
960
8%
2258

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
8%10%5%10%8%47%6%6%7%24%
47980
Night
47%49%9%5%8%6%7%9%27%
46935
Cloud CoverDay
8%10%49%8%46%6%6%8%26%
47981
Night
47%48%8%47%7%8%9%30%
46938
TransparencyDay
52%13%15%12%5%
47639
Night
44%16%17%14%6%1
46780
SeeingDay
16%27%27%18%7%1
5959
Night
8%32%28%19%9%1
15108

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%314%11%7%11%8%6%10%19%
1261
16th to endDay
15%5%13%11%6%9%8%6%9%22%
1536
February1st to 15thDay
17%6%12%10%7%10%7%8%9%18%
1426
16th to endDay
16%7%16%13%7%8%6%6%8%17%
1533
March1st to 15thDay
8%6%14%14%6%9%7%6%8%17%
1818
16th to endDay
317%9%16%11%5%7%5%46%10%
2165
April1st to 15thDay
6%17%10%14%9%46%5%46%13%
2212
16th to endDay
7%20%7%11%7%45%45%6%18%
2340
May1st to 15thDay
8%19%5%7%6%36%45%7%23%
2508
16th to endDay
19%14%48%8%35%45%6%18%
2802
June1st to 15thDay
19%13%5%7%7%45%5%5%6%19%
2700
16th to endDay
16%8%49%8%45%6%5%5%24%
2700
July1st to 15thDay
10%7%38%7%47%6%6%7%30%
2700
16th to endDay
7%6%36%7%45%5%6%7%38%
2745
August1st to 15thDay
12%7%37%7%36%6%6%6%33%
2501
16th to endDay
9%6%36%6%35%45%8%40%
2483
September1st to 15thDay
11%10%36%6%23446%40%
2118
16th to endDay
8%8%36%6%45%6%5%8%35%
1815
October1st to 15thDay
6%12%5%11%9%46%5%6%8%25%
1683
16th to endDay
39%5%10%8%47%7%7%10%25%
1584
November1st to 15thDay
28%5%12%10%7%9%7%6%10%19%
1486
16th to endDay
19%49%9%5%8%6%8%11%27%
1260
December1st to 15thDay
6%5%13%10%6%7%7%9%9%20%
1260
16th to endDay
6%411%12%6%10%9%7%10%19%
1344
January1st to 15thNight
6%6%12%13%8%10%8%8%10%13%
2685
16th to endNight
6%5%11%12%6%9%6%8%9%22%
2691
February1st to 15thNight
16%5%10%13%6%10%7%8%9%19%
2427
16th to endNight
7%414%11%7%9%7%6%9%21%
1941
March1st to 15thNight
5%5%12%10%6%11%8%8%11%18%
2141
16th to endNight
29%6%13%9%5%8%6%7%9%20%
2055
April1st to 15thNight
411%7%10%7%47%6%8%10%21%
1736
16th to endNight
313%5%10%8%36%5%7%6%28%
1620
May1st to 15thNight
6%11%5%7%7%35%5%5%8%33%
1437
16th to endNight
15%13%46%6%36%5%6%7%24%
1309
June1st to 15thNight
15%10%47%5%345%5%8%28%
1260
16th to endNight
12%6%36%5%36%5%6%7%35%
1260
July1st to 15thNight
6%5%25%5%245%6%8%47%
1260
16th to endNight
33134345%8%8%51%
1421
August1st to 15thNight
6%425%4345%6%8%47%
1458
16th to endNight
7%31432445%9%53%
1719
September1st to 15thNight
7%8%244345%5%8%46%
1827
16th to endNight
8%5%25%5%245%7%8%42%
1815
October1st to 15thNight
5%10%39%8%45%5%6%8%31%
1946
16th to endNight
38%5%10%9%6%8%6%7%10%24%
2288
November1st to 15thNight
17%6%11%10%6%10%7%7%11%17%
2359
16th to endNight
18%5%11%11%5%9%7%9%9%19%
2700
December1st to 15thNight
17%5%11%12%6%9%9%9%10%17%
2700
16th to endNight
5%413%14%8%10%7%8%9%15%
2880

Percentage Cloud Cover SW (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%29%10%5%10%8%10%11%23%
1261
16th to endDay
14410%11%6%9%6%8%10%27%
1536
February1st to 15thDay
17%410%10%6%8%10%8%9%22%
1426
16th to endDay
16%7%14%13%6%7%6%8%9%18%
1533
March1st to 15thDay
7%413%12%5%7%6%10%10%20%
1818
16th to endDay
316%9%16%11%5%7%5%5%6%12%
2166
April1st to 15thDay
6%17%9%13%8%5%6%5%5%6%13%
2212
16th to endDay
7%20%7%11%6%35%46%6%19%
2340
May1st to 15thDay
8%17%6%9%5%35%45%7%25%
2508
16th to endDay
19%14%48%7%45%5%5%6%18%
2802
June1st to 15thDay
20%13%48%7%35%45%6%19%
2700
16th to endDay
15%8%5%9%8%46%6%5%5%24%
2700
July1st to 15thDay
10%7%38%8%46%6%6%7%31%
2700
16th to endDay
7%5%36%7%45%5%6%8%38%
2745
August1st to 15thDay
12%7%37%7%45%5%5%7%33%
2501
16th to endDay
9%6%25%6%45%36%8%40%
2483
September1st to 15thDay
11%10%35%5%3345%6%40%
2118
16th to endDay
8%8%36%5%46%5%6%8%37%
1815
October1st to 15thDay
6%11%5%9%9%45%5%6%7%27%
1683
16th to endDay
28%410%7%35%7%9%11%27%
1584
November1st to 15thDay
26%49%9%6%8%9%8%9%25%
1486
16th to endDay
17%39%9%46%8%7%10%30%
1260
December1st to 15thDay
5%311%10%5%7%7%10%13%22%
1260
16th to endDay
5%49%9%5%11%7%9%12%24%
1344
January1st to 15thNight
5%411%11%6%10%9%10%11%17%
2685
16th to endNight
5%410%10%5%8%7%9%10%27%
2691
February1st to 15thNight
15%48%10%6%8%9%9%10%24%
2427
16th to endNight
16%412%10%6%8%8%9%8%24%
1941
March1st to 15thNight
14310%9%5%9%8%10%11%24%
2141
16th to endNight
19%5%12%10%46%7%8%9%23%
2058
April1st to 15thNight
5%12%7%9%5%46%6%7%9%24%
1736
16th to endNight
312%6%10%7%25%6%6%7%30%
1620
May1st to 15thNight
5%12%47%5%35%5%5%8%34%
1437
16th to endNight
15%13%46%6%35%47%6%25%
1309
June1st to 15thNight
14%10%46%5%35%5%5%6%30%
1260
16th to endNight
11%7%35%5%36%6%7%7%35%
1260
July1st to 15thNight
6%5%25%42446%8%47%
1260
16th to endNight
4223435%5%8%7%52%
1421
August1st to 15thNight
6%5%2432447%8%48%
1458
16th to endNight
7%4331446%9%54%
1719
September1st to 15thNight
7%7%234345%5%8%48%
1827
16th to endNight
8%5%245%25%46%8%44%
1815
October1st to 15thNight
5%10%38%8%45%47%9%31%
1946
16th to endNight
37%39%9%47%7%9%10%27%
2288
November1st to 15thNight
16%49%8%5%10%8%11%10%23%
2359
16th to endNight
17%49%10%5%8%7%9%13%23%
2700
December1st to 15thNight
5%5%8%10%5%9%8%11%12%20%
2700
16th to endNight
4312%9%7%9%9%10%11%20%
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
45%21%16%9%42
1261
16th to endDay
47%17%18%7%6%2
1536
February1st to 15thDay
48%16%20%7%42
1426
16th to endDay
56%13%15%8%4
1533
March1st to 15thDay
51%22%14%9%1
1818
16th to endDay
69%13%10%5%1
2166
April1st to 15thDay
67%10%13%5%2
2212
16th to endDay
62%10%14%9%1
2340
May1st to 15thDay
56%8%17%13%3
2508
16th to endDay
64%10%12%8%2
2807
June1st to 15thDay
64%9%11%10%3
2700
16th to endDay
58%10%12%12%4
2700
July1st to 15thDay
49%9%14%15%9%
2541
16th to endDay
43%8%14%19%11%1
2574
August1st to 15thDay
48%10%14%19%6%1
2484
16th to endDay
39%7%16%25%9%1
2483
September1st to 15thDay
43%7%14%20%12%1
2118
16th to endDay
41%11%16%20%8%
1815
October1st to 15thDay
52%12%15%10%7%
1683
16th to endDay
44%18%17%14%4
1584
November1st to 15thDay
47%21%15%10%3
1486
16th to endDay
40%21%19%9%6%2
1260
December1st to 15thDay
44%25%14%9%5%
1260
16th to endDay
45%19%19%8%5%
1344
January1st to 15thNight
49%22%13%7%41
2685
16th to endNight
45%17%16%9%7%3
2691
February1st to 15thNight
46%18%18%8%5%2
2438
16th to endNight
48%12%18%11%7%1
1941
March1st to 15thNight
44%23%18%8%4
2141
16th to endNight
53%15%16%10%3
2058
April1st to 15thNight
51%14%21%8%4
1736
16th to endNight
51%12%15%15%31
1620
May1st to 15thNight
47%10%17%19%4
1438
16th to endNight
55%11%16%12%4
1309
June1st to 15thNight
51%11%15%14%7%
1260
16th to endNight
43%11%15%21%7%
1260
July1st to 15thNight
35%9%21%22%11%1
1190
16th to endNight
26%11%18%28%14%
1329
August1st to 15thNight
31%9%20%29%8%
1450
16th to endNight
25%9%19%33%10%
1719
September1st to 15thNight
33%8%19%23%13%1
1827
16th to endNight
34%12%18%22%10%
1815
October1st to 15thNight
46%13%14%16%7%
1946
16th to endNight
45%16%17%15%4
2288
November1st to 15thNight
46%20%17%9%5%
2359
16th to endNight
45%20%16%9%5%2
2700
December1st to 15thNight
45%23%15%8%5%1
2700
16th to endNight
47%20%17%8%5%
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
36%41%23%15%10%
60
16th to endDay
128%39%21%6%3
64
February1st to 15thDay
12%30%41%10%4
65
16th to endDay
6%28%38%19%7%
192
March1st to 15thDay
12%48%28%9%
270
16th to endDay
12%41%30%13%1
288
April1st to 15thDay
15%31%34%15%3
269
16th to endDay
25%29%25%12%5%2
270
May1st to 15thDay
20%25%24%20%7%1
324
16th to endDay
26%18%14%18%15%5%
517
June1st to 15thDay
20%25%22%21%9%1
495
16th to endDay
16%25%28%18%8%2
495
July1st to 15thDay
16%20%23%24%11%3
475
16th to endDay
12%29%29%19%6%1
414
August1st to 15thDay
18%16%31%24%8%
315
16th to endDay
15%26%29%21%5%1
332
September1st to 15thDay
22%27%26%16%5%1
312
16th to endDay
20%32%27%15%4
255
October1st to 15thDay
17%32%30%15%3
178
16th to endDay
7%18%41%18%9%4
96
November1st to 15thDay
10%43%35%6%12
89
16th to endDay
16%16%28%13%16%8%
60
December1st to 15thDay
138%18%28%10%3
60
16th to endDay
129%37%20%10%
64
January1st to 15thNight
6%42%34%12%3
900
16th to endNight
5%41%30%16%5%
771
February1st to 15thNight
6%37%27%16%9%2
704
16th to endNight
331%34%20%8%1
632
March1st to 15thNight
6%39%34%13%5%
720
16th to endNight
5%32%34%18%7%1
768
April1st to 15thNight
7%33%26%24%6%1
656
16th to endNight
12%26%28%20%10%1
540
May1st to 15thNight
9%25%22%23%15%2
396
16th to endNight
23%22%16%17%17%3
375
June1st to 15thNight
15%25%19%22%14%2
360
16th to endNight
15%25%21%21%15%
360
July1st to 15thNight
12%17%21%26%20%2
340
16th to endNight
7%22%20%29%19%
376
August1st to 15thNight
10%13%15%33%25%2
378
16th to endNight
11%20%20%29%16%2
573
September1st to 15thNight
13%19%20%23%15%6%
701
16th to endNight
12%24%22%23%12%4
656
October1st to 15thNight
12%26%29%20%7%2
660
16th to endNight
9%26%32%21%7%1
704
November1st to 15thNight
9%44%30%10%3
778
16th to endNight
7%42%32%12%41
900
December1st to 15thNight
6%39%30%15%6%1
900
16th to endNight
341%33%14%5%
960
Page generated at 2017-09-15 22:58:31. Version ac04

Copyright 2017 A. Danko


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