Fernie Alpine Resort
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fernie Alpine Resort clear sky chart from 2005-11-05 to 2017-09-22.

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
35%
15139
9%
46859
7%
15109
38%
15109
17%
34232

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
16%
861
4%
2649
2%
859
18%
859
5%
2345
January16th to endNight
24%
768
7%
2688
6%
768
26%
768
9%
2200
February1st to 15thNight
22%
704
6%
2417
3%
700
26%
700
9%
1949
February16th to endNight
25%
632
7%
1926
5%
632
27%
632
12%
1561
March1st to 15thNight
27%
720
5%
2136
3%
720
30%
720
11%
1731
March16th to endNight
28%
768
5%
2064
2%
768
30%
768
13%
1672
April1st to 15thNight
36%
664
8%
1744
4%
664
38%
664
19%
1295
April16th to endNight
36%
540
11%
1620
8%
540
39%
540
19%
1152
May1st to 15thNight
41%
425
10%
1502
12%
425
43%
425
23%
941
May16th to endNight
46%
374
8%
1309
9%
374
47%
374
17%
911
June1st to 15thNight
46%
360
3%
1260
2%
360
46%
360
19%
854
June16th to endNight
49%
360
5%
1260
1%
360
50%
360
24%
766
July1st to 15thNight
66%
340
9%
1190
6%
340
69%
340
45%
550
July16th to endNight
69%
376
18%
1366
23%
354
76%
354
47%
577
August1st to 15thNight
71%
402
22%
1474
26%
400
76%
400
44%
670
August16th to endNight
65%
573
28%
1719
23%
573
68%
573
51%
822
September1st to 15thNight
60%
714
21%
1848
13%
714
62%
714
45%
1056
September16th to endNight
52%
683
17%
1890
13%
683
55%
683
32%
1203
October1st to 15thNight
41%
660
13%
1930
10%
660
45%
660
24%
1307
October16th to endNight
39%
704
10%
2288
9%
704
41%
704
17%
1656
November1st to 15thNight
23%
751
8%
2326
6%
751
27%
751
12%
1846
November16th to endNight
22%
900
4%
2673
2%
900
23%
900
9%
2245
December1st to 15thNight
17%
900
4%
2700
3%
900
18%
900
7%
2387
December16th to endNight
17%
960
4%
2880
2%
960
19%
960
6%
2536

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
15%13%46%5%34446%30%
48051
Night
15%15%47%423346%30%
47017
Cloud CoverDay
13%14%5%7%5%34446%30%
48052
Night
12%16%5%8%5%24346%29%
47020
TransparencyDay
53%5%15%17%7%1
47713
Night
54%5%14%17%6%1
46859
SeeingDay
24%13%26%23%9%1
5941
Night
23%8%23%30%12%1
15144

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
18%22%7%13%5%33335%13%
1298
16th to endDay
13%23%6%10%7%4435%5%15%
1536
February1st to 15thDay
16%20%7%8%5%23447%17%
1446
16th to endDay
12%24%9%10%5%33445%16%
1545
March1st to 15thDay
19%25%7%6%5%2334418%
1824
16th to endDay
21%26%5%8%5%3334412%
2159
April1st to 15thDay
17%19%48%7%34446%18%
2203
16th to endDay
16%17%5%6%6%24446%25%
2340
May1st to 15thDay
14%11%36%43445%7%33%
2445
16th to endDay
21%11%36%7%35%5%46%24%
2802
June1st to 15thDay
23%8%47%6%36%447%24%
2700
16th to endDay
19%6%25%5%35%5%6%6%32%
2700
July1st to 15thDay
7%314435%36%8%51%
2700
16th to endDay
431443445%9%56%
2705
August1st to 15thDay
6%21342446%8%53%
2478
16th to endDay
8%31333445%7%53%
2483
September1st to 15thDay
11%6%25%423347%48%
2111
16th to endDay
16%7%24424346%43%
1882
October1st to 15thDay
21%9%26%5%3445%6%29%
1700
16th to endDay
25%13%34323446%27%
1584
November1st to 15thDay
25%18%6%6%424346%17%
1520
16th to endDay
18%20%7%9%5%23335%19%
1286
December1st to 15thDay
18%22%9%9%7%2333415%
1260
16th to endDay
11%26%9%11%8%2432414%
1344
January1st to 15thNight
20%24%7%12%6%2323312%
2649
16th to endNight
12%23%8%10%6%23345%18%
2688
February1st to 15thNight
16%23%7%8%5%22335%20%
2406
16th to endNight
12%22%7%10%5%3433421%
1926
March1st to 15thNight
18%23%6%6%325%347%18%
2136
16th to endNight
18%21%46%42345%6%21%
2061
April1st to 15thNight
15%16%25%5%2347%8%28%
1744
16th to endNight
15%13%47%5%23447%32%
1620
May1st to 15thNight
11%9%26%5%3445%6%39%
1501
16th to endNight
18%9%35%426%46%7%28%
1309
June1st to 15thNight
18%5%245%36%46%7%33%
1260
16th to endNight
16%324435%5%7%7%38%
1260
July1st to 15thNight
4233244410%59%
1260
16th to endNight
42222345%6%65%
1461
August1st to 15thNight
423223448%62%
1482
16th to endNight
5%12222348%65%
1719
September1st to 15thNight
7%41432335%6%57%
1848
16th to endNight
16%5%24422346%46%
1890
October1st to 15thNight
18%8%24334448%37%
1930
16th to endNight
23%10%3432446%6%29%
2288
November1st to 15thNight
25%18%45%422346%23%
2326
16th to endNight
20%25%8%6%413335%17%
2673
December1st to 15thNight
17%25%7%12%8%2323311%
2700
16th to endNight
15%26%10%11%6%2424412%
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
13%23%8%14%7%23435%13%
1298
16th to endDay
8%22%10%13%6%35%345%16%
1536
February1st to 15thDay
10%23%10%10%5%2445%6%16%
1446
16th to endDay
8%25%9%11%6%35%5%45%15%
1545
March1st to 15thDay
15%26%7%8%5%3333417%
1824
16th to endDay
16%29%7%8%5%3433412%
2160
April1st to 15thDay
14%21%5%8%7%44446%16%
2203
16th to endDay
12%18%6%8%5%25%446%24%
2340
May1st to 15thDay
13%13%36%6%25%5%46%31%
2445
16th to endDay
22%10%47%6%35%5%5%5%23%
2802
June1st to 15thDay
22%9%46%6%45%45%6%24%
2700
16th to endDay
17%6%35%5%36%5%6%6%32%
2700
July1st to 15thDay
7%414435%45%8%50%
2700
16th to endDay
431343346%8%56%
2705
August1st to 15thDay
6%2144245%5%9%52%
2478
16th to endDay
7%41432346%7%52%
2483
September1st to 15thDay
10%7%25%42345%6%47%
2111
16th to endDay
15%7%25%5%33437%42%
1882
October1st to 15thDay
20%9%46%5%2445%7%28%
1700
16th to endDay
19%16%46%423446%26%
1584
November1st to 15thDay
20%23%5%6%42445%5%17%
1520
16th to endDay
13%22%7%10%6%24246%18%
1286
December1st to 15thDay
13%24%9%10%8%3333415%
1260
16th to endDay
8%26%9%16%8%2432414%
1344
January1st to 15thNight
14%25%8%15%6%3422311%
2649
16th to endNight
9%23%9%12%7%34335%17%
2688
February1st to 15thNight
11%25%8%10%7%23245%18%
2406
16th to endNight
8%24%8%11%7%3323420%
1926
March1st to 15thNight
12%25%7%7%4345%46%17%
2136
16th to endNight
13%22%6%7%6%245%5%6%20%
2064
April1st to 15thNight
13%16%36%4245%6%8%27%
1744
16th to endNight
9%17%47%5%23347%32%
1620
May1st to 15thNight
10%10%26%6%3445%7%38%
1501
16th to endNight
19%8%45%6%346%6%7%28%
1309
June1st to 15thNight
17%6%25%436%6%5%8%32%
1260
16th to endNight
15%325%435%6%6%7%38%
1260
July1st to 15thNight
32342345%9%58%
1260
16th to endNight
31122235%5%6%64%
1461
August1st to 15thNight
323324448%61%
1482
16th to endNight
5%11122235%8%64%
1719
September1st to 15thNight
7%41341345%6%56%
1848
16th to endNight
13%5%34423448%45%
1890
October1st to 15thNight
16%10%25%42445%7%36%
1930
16th to endNight
17%15%35%42446%6%28%
2288
November1st to 15thNight
20%21%5%6%423347%21%
2326
16th to endNight
13%26%10%9%42423418%
2673
December1st to 15thNight
12%26%8%13%9%3423311%
2700
16th to endNight
10%26%12%14%6%3333412%
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
74%7%10%5%1
1298
16th to endDay
70%7%11%8%2
1536
February1st to 15thDay
65%7%14%9%3
1446
16th to endDay
69%6%12%8%3
1545
March1st to 15thDay
70%5%13%8%1
1824
16th to endDay
74%412%6%2
2160
April1st to 15thDay
65%5%15%11%2
2203
16th to endDay
59%417%15%2
2340
May1st to 15thDay
48%416%21%7%
2445
16th to endDay
59%5%18%11%4
2807
June1st to 15thDay
58%412%16%6%1
2700
16th to endDay
48%416%21%8%
2700
July1st to 15thDay
31%5%15%26%18%3
2541
16th to endDay
24%5%12%29%23%4
2537
August1st to 15thDay
26%5%19%31%14%2
2461
16th to endDay
28%5%18%28%17%2
2483
September1st to 15thDay
35%316%28%14%2
2111
16th to endDay
41%5%17%23%10%1
1882
October1st to 15thDay
53%6%18%16%4
1700
16th to endDay
57%5%21%14%1
1584
November1st to 15thDay
68%7%10%10%2
1520
16th to endDay
66%9%14%6%2
1286
December1st to 15thDay
73%5%10%9%1
1260
16th to endDay
74%49%8%2
1344
January1st to 15thNight
78%46%7%2
2649
16th to endNight
68%5%12%9%2
2688
February1st to 15thNight
67%5%13%10%4
2417
16th to endNight
66%411%13%3
1926
March1st to 15thNight
65%6%16%10%1
2136
16th to endNight
62%7%15%11%2
2064
April1st to 15thNight
51%7%19%16%5%
1744
16th to endNight
51%5%16%21%3
1620
May1st to 15thNight
43%419%20%12%
1502
16th to endNight
51%5%19%17%5%
1309
June1st to 15thNight
48%5%16%20%7%1
1260
16th to endNight
39%5%21%23%10%
1260
July1st to 15thNight
20%418%32%18%5%
1190
16th to endNight
18%313%33%25%6%
1366
August1st to 15thNight
19%5%17%38%15%2
1474
16th to endNight
17%416%35%22%3
1719
September1st to 15thNight
26%413%33%17%4
1848
16th to endNight
37%5%19%22%13%2
1890
October1st to 15thNight
44%6%21%20%5%1
1930
16th to endNight
53%6%19%17%3
2288
November1st to 15thNight
62%7%11%13%4
2326
16th to endNight
68%6%12%8%3
2673
December1st to 15thNight
78%37%8%1
2700
16th to endNight
77%49%6%2
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
15%5%20%36%13%10%
60
16th to endDay
34%9%21%17%9%7%
64
February1st to 15thDay
28%13%28%20%8%
69
16th to endDay
29%16%24%22%5%
204
March1st to 15thDay
47%18%24%8%1
270
16th to endDay
40%15%27%14%2
288
April1st to 15thDay
32%17%28%16%4
269
16th to endDay
31%21%23%17%41
270
May1st to 15thDay
25%19%28%19%6%1
291
16th to endDay
25%10%18%28%14%2
517
June1st to 15thDay
23%13%24%25%12%
495
16th to endDay
19%13%26%26%13%1
495
July1st to 15thDay
9%8%28%32%19%1
475
16th to endDay
8%14%38%26%9%1
374
August1st to 15thDay
8%11%33%31%12%3
315
16th to endDay
13%11%33%26%12%2
332
September1st to 15thDay
23%16%24%24%8%1
315
16th to endDay
25%16%29%17%10%1
280
October1st to 15thDay
34%13%25%20%6%
184
16th to endDay
48%7%16%17%7%2
96
November1st to 15thDay
47%323%25%
90
16th to endDay
42%10%17%14%14%1
64
December1st to 15thDay
36%6%28%18%8%1
60
16th to endDay
21%443%23%6%
64
January1st to 15thNight
33%13%23%22%6%1
864
16th to endNight
23%10%27%28%8%
768
February1st to 15thNight
28%10%25%27%6%1
704
16th to endNight
24%9%27%26%11%
632
March1st to 15thNight
31%11%22%24%8%
720
16th to endNight
31%9%23%25%7%
768
April1st to 15thNight
24%9%23%30%11%
664
16th to endNight
22%11%23%28%13%1
540
May1st to 15thNight
16%8%23%34%14%1
426
16th to endNight
22%6%14%31%23%1
375
June1st to 15thNight
17%7%21%33%19%
360
16th to endNight
16%6%20%38%17%1
360
July1st to 15thNight
5%417%47%23%1
340
16th to endNight
5%317%49%24%
376
August1st to 15thNight
5%315%42%30%3
402
16th to endNight
6%420%39%27%1
573
September1st to 15thNight
9%419%35%23%6%
714
16th to endNight
18%420%31%21%3
683
October1st to 15thNight
24%5%23%34%10%1
660
16th to endNight
28%6%19%33%11%
704
November1st to 15thNight
32%12%25%24%4
751
16th to endNight
34%11%23%22%8%1
900
December1st to 15thNight
30%9%27%26%5%
900
16th to endNight
25%13%28%27%5%
960
Page generated at 2017-09-23 03:43:46. Version ac04

Copyright 2017 A. Danko


Fernie Alpine Resort Clear Sky Chart | Charts Home