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 2017-09-10.

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%
14655
10%
46700
5%
14621
28%
14621
12%
35875

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
10%
749
6%
2680
1%
745
16%
745
5%
2260
January16th to endNight
17%
768
11%
2672
3%
768
27%
768
8%
2122
February1st to 15thNight
18%
704
7%
2286
2%
701
23%
701
8%
1824
February16th to endNight
13%
631
6%
1984
2%
631
19%
631
8%
1675
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
31%
601
12%
1794
5%
601
37%
601
20%
1224
September16th to endNight
33%
657
18%
1815
10%
657
40%
657
25%
1209
October1st to 15thNight
29%
660
16%
1955
8%
660
36%
660
18%
1393
October16th to endNight
19%
704
10%
2216
5%
704
24%
704
10%
1715
November1st to 15thNight
18%
720
11%
2397
7%
720
24%
720
9%
1851
November16th to endNight
19%
750
8%
2520
6%
750
23%
750
7%
2061
December1st to 15thNight
10%
750
4%
2676
1%
750
14%
750
5%
2284
December16th to endNight
10%
800
5%
2880
2%
800
14%
800
3%
2483

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%
47941
Night
17%13%48%6%35%445%25%
46858
TransparencyDay
61%5%10%15%6%
47617
Night
60%5%10%15%6%
46700
SeeingDay
29%15%26%17%7%1
6731
Night
25%17%27%21%7%
14655

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
14%18%7%11%9%6%422417%
1256
16th to endDay
10%13%8%12%7%47%6%5%419%
1551
February1st to 15thDay
10%13%5%10%11%7%9%5%4417%
1575
16th to endDay
14%18%6%11%7%45%42418%
1488
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
25%9%36%413435%33%
2050
16th to endDay
20%8%25%423345%39%
1815
October1st to 15thDay
19%16%36%423345%29%
1675
16th to endDay
28%18%46%42343320%
1656
November1st to 15thDay
21%17%5%8%5%4334421%
1461
16th to endDay
17%20%5%12%6%2333420%
1440
December1st to 15thDay
20%17%7%9%8%35%33315%
1281
16th to endDay
17%17%7%14%9%45%43412%
1344
January1st to 15thNight
14%17%7%10%10%5%6%44314%
2680
16th to endNight
10%13%7%11%7%5%8%6%4418%
2672
February1st to 15thNight
9%14%5%10%9%6%8%5%5%5%19%
2285
16th to endNight
13%19%6%10%9%5%6%43318%
1984
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
18%8%34424346%38%
1794
16th to endNight
17%6%15%423346%42%
1815
October1st to 15thNight
20%10%35%5%2335%5%34%
1955
16th to endNight
23%18%36%413445%23%
2216
November1st to 15thNight
22%14%46%5%34335%25%
2397
16th to endNight
18%17%6%12%6%2423420%
2520
December1st to 15thNight
20%16%6%10%11%5%442314%
2676
16th to endNight
19%18%7%12%9%4432313%
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
72%38%9%5%
1257
16th to endDay
64%5%8%14%6%
1551
February1st to 15thDay
66%6%9%11%4
1578
16th to endDay
69%5%6%12%6%
1488
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
53%5%12%22%5%
2050
16th to endDay
46%412%25%10%
1815
October1st to 15thDay
56%5%13%17%6%
1675
16th to endDay
69%38%13%5%
1656
November1st to 15thDay
65%6%9%11%5%
1461
16th to endDay
68%411%12%2
1440
December1st to 15thDay
73%5%8%8%2
1281
16th to endDay
76%5%7%7%2
1344
January1st to 15thNight
71%6%8%9%3
2680
16th to endNight
64%6%7%15%5%
2672
February1st to 15thNight
64%6%10%13%4
2286
16th to endNight
70%5%6%8%7%1
1984
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
46%5%14%23%8%1
1794
16th to endNight
42%5%15%24%10%1
1815
October1st to 15thNight
51%412%22%7%
1955
16th to endNight
62%410%17%5%
2216
November1st to 15thNight
62%5%12%13%6%
2397
16th to endNight
69%410%11%3
2520
December1st to 15thNight
73%5%9%9%2
2676
16th to endNight
76%47%7%3
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
26%25%35%10%3
60
16th to endDay
22%20%39%10%6%1
79
February1st to 15thDay
18%18%33%22%7%
236
16th to endDay
33%20%25%13%5%1
224
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
30%11%27%20%7%2
294
16th to endDay
25%14%29%18%7%4
254
October1st to 15thDay
26%17%21%20%9%5%
230
16th to endDay
43%16%20%12%7%
240
November1st to 15thDay
35%17%22%14%8%
235
16th to endDay
30%22%23%18%41
240
December1st to 15thDay
37%23%24%9%4
81
16th to endDay
34%37%20%6%1
64
January1st to 15thNight
26%26%29%13%3
749
16th to endNight
19%23%33%20%4
768
February1st to 15thNight
18%25%31%18%5%
704
16th to endNight
24%19%34%14%5%
631
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
23%12%27%26%8%
601
16th to endNight
21%12%29%26%8%1
657
October1st to 15thNight
26%13%26%22%9%1
660
16th to endNight
35%19%21%16%6%
704
November1st to 15thNight
31%18%24%18%5%
720
16th to endNight
26%21%26%17%7%
750
December1st to 15thNight
28%25%28%14%3
750
16th to endNight
32%23%23%14%41
800
Page generated at 2017-09-11 20:35:22. Version ac04

Copyright 2017 A. Danko


Mount Carleton Provincial Park Clear Sky Chart | Charts Home