Mount Carleton Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mount Carleton Provincial Park clear sky chart from 2005-11-05 to 2018-02-22.

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
23%
15385
10%
48909
5%
15351
28%
15351
12%
37573

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
9%
823
6%
2904
1%
819
15%
819
5%
2459
January16th to endNight
16%
832
10%
2894
3%
832
26%
832
8%
2292
February1st to 15thNight
17%
764
8%
2481
2%
761
23%
761
8%
1979
February16th to endNight
13%
659
7%
2073
2%
659
19%
659
7%
1746
March1st to 15thNight
19%
720
13%
2057
7%
720
26%
720
12%
1617
March16th to endNight
22%
768
15%
2112
6%
768
29%
768
15%
1594
April1st to 15thNight
21%
605
12%
1740
7%
605
25%
605
13%
1348
April16th to endNight
26%
540
17%
1620
9%
540
33%
540
17%
1130
May1st to 15thNight
28%
540
10%
1563
7%
540
32%
540
15%
1171
May16th to endNight
24%
436
9%
1371
4%
435
31%
435
12%
1030
June1st to 15thNight
36%
360
7%
1260
5%
360
39%
360
15%
905
June16th to endNight
31%
360
5%
1260
3%
360
33%
360
12%
944
July1st to 15thNight
36%
340
8%
1190
5%
340
41%
340
18%
824
July16th to endNight
41%
380
8%
1325
8%
358
44%
358
16%
930
August1st to 15thNight
40%
539
9%
1608
6%
535
42%
535
19%
1131
August16th to endNight
38%
573
15%
1719
9%
573
43%
573
23%
1150
September1st to 15thNight
32%
621
12%
1850
5%
621
39%
621
21%
1249
September16th to endNight
34%
717
19%
1980
11%
717
41%
717
25%
1324
October1st to 15thNight
29%
720
15%
2133
8%
720
36%
720
19%
1502
October16th to endNight
19%
768
11%
2418
6%
768
25%
768
11%
1858
November1st to 15thNight
20%
790
12%
2602
7%
790
26%
790
10%
1984
November16th to endNight
18%
825
7%
2730
5%
825
22%
825
7%
2246
December1st to 15thNight
10%
825
5%
2899
1%
825
15%
825
5%
2468
December16th to endNight
10%
880
6%
3120
3%
880
15%
880
4%
2692

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
20%13%48%6%34445%24%
49355
Night
17%13%48%7%35%445%25%
49067
TransparencyDay
61%5%10%15%6%
49031
Night
60%5%10%15%6%
48909
SeeingDay
29%16%27%17%7%1
7189
Night
25%17%27%21%7%
15385

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
15%18%7%10%9%5%433417%
1361
16th to endDay
10%14%7%12%7%47%6%5%419%
1680
February1st to 15thDay
10%14%5%10%11%7%9%5%4416%
1710
16th to endDay
14%18%6%11%7%46%425%18%
1546
March1st to 15thDay
15%17%6%7%6%26%445%22%
1891
16th to endDay
13%18%7%8%5%3433329%
2112
April1st to 15thDay
20%18%5%8%5%2333424%
2206
16th to endDay
23%12%46%42334430%
2340
May1st to 15thDay
23%12%47%434345%26%
2386
16th to endDay
27%10%46%43335%5%24%
2755
June1st to 15thDay
27%9%36%5%3445%6%24%
2700
16th to endDay
27%8%47%6%345%45%20%
2700
July1st to 15thDay
19%8%37%6%45%5%5%7%24%
2700
16th to endDay
20%8%37%7%36%46%7%23%
2736
August1st to 15thDay
20%8%48%7%46%45%5%25%
2340
16th to endDay
19%8%37%6%35%447%28%
2483
September1st to 15thDay
24%9%25%413335%34%
2106
16th to endDay
19%9%25%423345%39%
1980
October1st to 15thDay
19%15%35%41435%5%30%
1827
16th to endDay
27%18%46%42343322%
1806
November1st to 15thDay
21%17%5%7%43334422%
1586
16th to endDay
18%19%5%12%6%2333420%
1560
December1st to 15thDay
20%17%7%10%8%35%33315%
1388
16th to endDay
16%16%7%14%9%45%43411%
1456
January1st to 15thNight
14%17%7%10%11%5%6%43314%
2904
16th to endNight
10%12%7%11%8%5%8%6%4418%
2894
February1st to 15thNight
10%14%49%8%6%9%5%5%5%19%
2480
16th to endNight
13%18%6%10%9%46%43318%
2073
March1st to 15thNight
15%13%5%9%6%36%44424%
2045
16th to endNight
14%14%7%7%425%33431%
2112
April1st to 15thNight
21%15%37%5%3334327%
1740
16th to endNight
21%9%34423345%36%
1620
May1st to 15thNight
22%11%35%5%34445%29%
1563
16th to endNight
21%10%36%6%35%346%27%
1369
June1st to 15thNight
21%7%36%5%35%5%5%6%30%
1260
16th to endNight
19%9%38%6%36%45%6%25%
1260
July1st to 15thNight
15%8%25%5%345%6%8%33%
1260
16th to endNight
16%9%36%5%345%5%7%30%
1416
August1st to 15thNight
14%6%35%6%35%5%6%8%32%
1620
16th to endNight
14%6%25%6%245%5%8%38%
1719
September1st to 15thNight
17%8%34424345%40%
1850
16th to endNight
17%6%25%324446%42%
1980
October1st to 15thNight
19%9%35%42435%5%36%
2133
16th to endNight
22%17%36%413446%24%
2418
November1st to 15thNight
21%14%46%5%34335%26%
2602
16th to endNight
18%16%6%12%6%2433419%
2730
December1st to 15thNight
19%17%6%10%10%5%442315%
2899
16th to endNight
18%17%7%12%10%5%5%32313%
3120

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%9%5%
1362
16th to endDay
63%5%7%15%6%
1680
February1st to 15thDay
67%6%9%11%4
1713
16th to endDay
69%5%6%12%6%
1546
March1st to 15thDay
63%48%14%7%1
1902
16th to endDay
59%38%17%10%1
2112
April1st to 15thDay
64%37%12%9%2
2206
16th to endDay
57%47%16%11%2
2340
May1st to 15thDay
61%47%15%9%1
2386
16th to endDay
62%5%9%16%6%
2759
June1st to 15thDay
59%7%10%13%8%1
2700
16th to endDay
64%6%10%12%5%
2700
July1st to 15thDay
56%6%15%16%5%
2541
16th to endDay
58%7%14%14%5%
2565
August1st to 15thDay
58%7%14%16%2
2327
16th to endDay
53%7%15%18%4
2483
September1st to 15thDay
52%5%12%22%6%
2106
16th to endDay
47%411%24%11%
1980
October1st to 15thDay
54%5%13%19%6%
1827
16th to endDay
67%38%14%5%
1806
November1st to 15thDay
64%6%9%12%6%
1586
16th to endDay
68%411%12%2
1560
December1st to 15thDay
74%5%8%8%3
1388
16th to endDay
76%5%7%7%3
1456
January1st to 15thNight
71%6%8%9%3
2904
16th to endNight
64%6%8%15%5%
2894
February1st to 15thNight
63%6%10%13%4
2481
16th to endNight
70%5%6%8%7%
2073
March1st to 15thNight
62%48%16%7%
2057
16th to endNight
57%38%17%11%1
2112
April1st to 15thNight
61%47%12%11%2
1740
16th to endNight
50%48%18%16%2
1620
May1st to 15thNight
57%49%16%9%1
1563
16th to endNight
58%5%10%17%7%
1371
June1st to 15thNight
53%6%12%17%8%1
1260
16th to endNight
57%7%12%13%9%
1260
July1st to 15thNight
46%9%14%22%6%
1190
16th to endNight
49%8%15%17%8%
1325
August1st to 15thNight
46%9%18%20%4
1608
16th to endNight
42%8%18%25%5%
1719
September1st to 15thNight
44%5%14%24%8%1
1850
16th to endNight
41%6%15%24%11%1
1980
October1st to 15thNight
49%5%13%23%8%
2133
16th to endNight
61%410%17%5%
2418
November1st to 15thNight
60%5%12%14%6%
2602
16th to endNight
70%410%11%3
2730
December1st to 15thNight
73%5%9%9%2
2899
16th to endNight
76%46%7%3
3120

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%28%32%10%3
90
16th to endDay
25%25%35%8%4
112
February1st to 15thDay
18%20%34%19%6%
281
16th to endDay
33%22%25%12%5%1
244
March1st to 15thDay
30%18%31%14%5%
270
16th to endDay
23%20%28%15%8%3
288
April1st to 15thDay
35%20%25%11%42
270
16th to endDay
30%18%25%17%6%2
270
May1st to 15thDay
35%13%25%17%5%2
342
16th to endDay
35%17%23%16%6%
519
June1st to 15thDay
35%13%20%20%9%1
495
16th to endDay
30%13%29%15%10%
495
July1st to 15thDay
22%12%27%22%11%2
475
16th to endDay
24%9%32%23%8%1
425
August1st to 15thDay
22%9%33%21%11%1
313
16th to endDay
26%14%25%20%12%1
332
September1st to 15thDay
28%11%29%21%6%2
315
16th to endDay
25%13%32%17%7%3
314
October1st to 15thDay
26%18%24%17%8%4
277
16th to endDay
43%16%19%12%7%
288
November1st to 15thDay
34%17%22%15%10%
280
16th to endDay
30%22%24%17%41
285
December1st to 15thDay
37%24%25%8%3
113
16th to endDay
31%34%20%11%2
96
January1st to 15thNight
25%27%29%14%3
823
16th to endNight
18%23%34%19%3
832
February1st to 15thNight
19%25%31%17%5%
764
16th to endNight
24%20%33%14%5%
659
March1st to 15thNight
25%19%30%17%5%
720
16th to endNight
20%19%28%22%7%1
768
April1st to 15thNight
31%17%24%19%6%
605
16th to endNight
30%16%24%20%7%
540
May1st to 15thNight
28%10%27%24%6%1
540
16th to endNight
26%13%30%23%5%
436
June1st to 15thNight
24%6%26%33%8%
360
16th to endNight
22%12%25%28%11%
360
July1st to 15thNight
18%8%30%28%14%
340
16th to endNight
17%5%29%32%14%
380
August1st to 15thNight
20%6%25%30%16%
539
16th to endNight
17%7%30%29%13%1
573
September1st to 15thNight
22%12%27%27%9%
621
16th to endNight
21%11%29%27%8%1
717
October1st to 15thNight
25%14%27%22%9%1
720
16th to endNight
34%19%21%16%6%
768
November1st to 15thNight
31%18%24%18%6%1
790
16th to endNight
26%22%26%17%6%
825
December1st to 15thNight
28%25%28%15%3
825
16th to endNight
30%24%23%15%41
880
Page generated at 2018-02-23 12:21:36. Version ac04

Copyright 2018 A. Danko


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