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 2005-11-06 to 2024-03-18.

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
22%
23282
10%
81259
5%
23171
28%
23171
11%
61860

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 10thNight
8%
843
5%
4725
1%
817
13%
817
3%
3926
January11th to 20thNight
13%
797
10%
4546
2%
776
20%
776
3%
3684
January21st to endNight
18%
827
9%
4787
5%
814
28%
814
6%
3314
February1st to 10thNight
14%
760
11%
2470
4%
760
22%
760
8%
1927
February11th to 20thNight
11%
743
6%
2406
1%
740
18%
740
6%
2012
February21st to endNight
14%
628
10%
1934
3%
628
23%
628
11%
1511
March1st to 10thNight
16%
760
14%
2211
6%
760
25%
760
12%
1718
March11th to 20thNight
18%
752
11%
2067
6%
752
23%
752
12%
1646
March21st to endNight
20%
792
13%
2178
5%
792
27%
792
14%
1694
April1st to 10thNight
17%
640
11%
1806
5%
640
22%
640
11%
1460
April11th to 20thNight
23%
534
17%
1598
8%
534
30%
534
17%
1121
April21st to endNight
25%
540
15%
1620
8%
540
32%
540
16%
1174
May1st to 10thNight
28%
540
12%
1620
8%
540
32%
540
14%
1196
May11th to 20thNight
25%
532
14%
1424
7%
532
32%
532
18%
1047
May21st to endNight
25%
397
11%
1365
4%
396
35%
396
14%
955
June1st to 10thNight
32%
360
9%
1260
6%
360
37%
360
15%
890
June11th to 20thNight
39%
360
10%
1260
7%
360
42%
360
17%
856
June21st to endNight
30%
360
6%
1260
3%
360
34%
360
12%
942
July1st to 10thNight
33%
350
10%
1225
4%
350
41%
350
18%
833
July11th to 20thNight
40%
348
9%
1218
9%
348
44%
348
19%
826
July21st to endNight
42%
399
10%
1429
11%
377
46%
377
15%
1006
August1st to 10thNight
38%
538
8%
1600
5%
534
40%
534
20%
1111
August11th to 20thNight
41%
532
11%
1596
9%
532
43%
532
19%
1132
August21st to endNight
40%
594
17%
1782
10%
594
44%
594
23%
1192
September1st to 10thNight
34%
572
14%
1783
7%
572
40%
572
23%
1161
September11th to 20thNight
33%
720
15%
1980
7%
720
41%
720
24%
1339
September21st to endNight
32%
720
19%
1980
11%
720
39%
720
24%
1349
October1st to 10thNight
30%
720
17%
2119
10%
720
37%
720
20%
1480
October11th to 20thNight
24%
720
12%
2160
6%
720
29%
720
15%
1612
October21st to endNight
16%
792
10%
2545
3%
792
23%
792
9%
1982
November1st to 10thNight
17%
785
11%
2502
4%
785
23%
785
11%
1903
November11th to 20thNight
17%
850
10%
2660
6%
850
22%
850
8%
2136
November21st to endNight
14%
850
5%
2660
3%
850
17%
850
6%
2230
December1st to 10thNight
9%
850
7%
2812
2%
850
15%
850
6%
2385
December11th to 20thNight
12%
850
5%
3492
3%
849
15%
849
4%
3022
December21st to endNight
11%
927
4%
5179
2%
907
15%
907
2%
4088

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
19%13%5%9%7%45%445%25%
78161
Night
17%13%5%9%8%45%445%26%
81640
TransparencyDay
60%6%10%16%7%1
77853
Night
60%6%11%16%7%1
81483
SeeingDay
29%19%29%16%6%1
15259
Night
25%18%28%21%7%1
23310

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 10thDay
14%15%7%10%10%8%6%43419%
2207
11th to 20thDay
11%14%9%15%18%6%444212%
2369
21st to endDay
7%10%6%18%9%5%6%5%5%6%25%
2809
February1st to 10thDay
12%14%6%10%11%7%8%5%5%418%
1710
11th to 20thDay
13%18%7%13%9%5%7%5%4416%
1663
21st to endDay
10%14%6%12%9%6%7%5%46%22%
1517
March1st to 10thDay
14%17%8%10%7%46%435%22%
1964
11th to 20thDay
13%19%6%10%10%3444422%
2059
21st to endDay
14%19%7%9%5%3434428%
2178
April1st to 10thDay
19%19%6%10%5%34435%22%
2150
11th to 20thDay
20%15%47%5%34345%30%
2312
21st to endDay
23%15%5%7%5%33345%26%
2340
May1st to 10thDay
24%16%47%6%3434426%
2340
11th to 20thDay
23%12%47%434446%29%
2476
21st to endDay
23%9%36%5%3445%6%31%
2919
June1st to 10thDay
26%10%36%5%45%5%5%6%26%
2700
11th to 20thDay
23%8%37%6%35%45%7%29%
2700
21st to endDay
27%10%47%7%445%46%23%
2700
July1st to 10thDay
20%9%48%6%5%6%6%6%8%25%
2700
11th to 20thDay
17%8%37%7%5%6%6%6%8%28%
2700
21st to endDay
19%8%37%6%46%5%6%8%27%
2782
August1st to 10thDay
19%8%37%7%46%6%7%7%27%
2327
11th to 20thDay
19%9%48%7%45%447%29%
2304
21st to endDay
19%8%37%6%46%5%5%7%31%
2574
September1st to 10thDay
22%8%36%42445%7%36%
2172
11th to 20thDay
22%9%36%42334440%
1980
21st to endDay
21%10%35%43445%5%36%
1980
October1st to 10thDay
17%14%36%5%2346%6%34%
1841
11th to 20thDay
23%16%37%435%445%27%
1800
21st to endDay
26%18%6%7%5%3434421%
1810
November1st to 10thDay
20%20%6%7%5%3345%424%
1575
11th to 20thDay
19%16%6%14%5%4434420%
1520
21st to endDay
16%18%6%15%8%34445%18%
1520
December1st to 10thDay
20%17%8%13%9%3433415%
1364
11th to 20thDay
15%17%8%13%10%5%6%44315%
1668
21st to endDay
16%16%5%16%12%3432320%
2431
January1st to 10thNight
9%15%7%14%15%8%6%5%5%413%
4748
11th to 20thNight
13%15%7%14%14%445%3317%
4592
21st to endNight
8%12%7%14%8%46%446%26%
4845
February1st to 10thNight
11%14%5%11%8%7%7%5%5%5%22%
2470
11th to 20thNight
14%18%6%10%9%5%9%5%3417%
2403
21st to endNight
10%15%5%10%9%6%6%445%25%
1934
March1st to 10thNight
13%13%7%10%8%47%445%26%
2202
11th to 20thNight
16%17%6%9%7%45%43425%
2066
21st to endNight
14%15%8%9%6%36%44427%
2178
April1st to 10thNight
22%17%49%6%4433325%
1806
11th to 20thNight
20%12%35%434445%35%
1598
21st to endNight
23%11%45%5%3446%6%30%
1620
May1st to 10thNight
24%13%36%5%2445%5%30%
1620
11th to 20thNight
20%13%25%6%3445%5%32%
1423
21st to endNight
19%8%36%6%36%5%5%7%33%
1364
June1st to 10thNight
21%9%46%6%345%47%32%
1260
11th to 20thNight
19%6%36%5%35%5%6%8%33%
1260
21st to endNight
21%10%38%6%35%5%5%7%27%
1260
July1st to 10thNight
16%9%25%5%35%5%6%9%33%
1260
11th to 20thNight
15%7%37%5%445%7%7%35%
1260
21st to endNight
17%10%46%6%35%5%5%8%31%
1513
August1st to 10thNight
15%7%36%7%45%6%6%8%34%
1612
11th to 20thNight
17%7%36%6%36%6%7%8%32%
1596
21st to endNight
15%8%26%5%345%5%8%39%
1782
September1st to 10thNight
18%6%25%435%5%5%6%42%
1783
11th to 20thNight
20%9%34423346%41%
1980
21st to endNight
19%7%25%424446%41%
1980
October1st to 10thNight
21%9%35%434445%37%
2119
11th to 20thNight
22%14%36%5%2445%5%30%
2160
21st to endNight
22%19%5%7%5%23446%24%
2545
November1st to 10thNight
21%15%5%7%6%34446%26%
2502
11th to 20thNight
19%16%7%12%6%3435%5%21%
2660
21st to endNight
18%16%7%15%7%3433418%
2660
December1st to 10thNight
19%16%7%13%11%4343416%
2812
11th to 20thNight
19%19%8%11%10%5%5%43313%
3531
21st to endNight
18%17%6%12%11%4433419%
5236

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 10thDay
66%8%12%10%4
2208
11th to 20thDay
76%5%6%9%5%
2369
21st to endDay
58%7%8%16%11%1
2809
February1st to 10thDay
66%6%9%10%7%1
1710
11th to 20thDay
70%6%7%12%5%1
1671
21st to endDay
63%6%7%16%7%1
1517
March1st to 10thDay
64%5%8%14%7%1
1968
11th to 20thDay
66%47%15%6%2
2059
21st to endDay
61%48%16%10%2
2178
April1st to 10thDay
65%5%9%11%8%2
2150
11th to 20thDay
57%5%8%18%10%2
2312
21st to endDay
61%5%7%15%10%3
2340
May1st to 10thDay
63%46%15%10%1
2340
11th to 20thDay
57%5%10%17%10%1
2480
21st to endDay
54%6%10%21%9%
2919
June1st to 10thDay
57%8%10%15%9%1
2700
11th to 20thDay
54%6%11%18%9%1
2700
21st to endDay
61%7%11%15%6%
2700
July1st to 10thDay
55%8%17%15%5%
2625
11th to 20thDay
51%8%14%20%7%
2619
21st to endDay
54%9%14%18%6%
2626
August1st to 10thDay
54%9%16%16%5%
2314
11th to 20thDay
54%7%14%18%5%
2304
21st to endDay
51%7%15%21%5%
2574
September1st to 10thDay
48%7%14%23%9%
2172
11th to 20thDay
49%411%25%11%
1980
21st to endDay
49%6%11%24%10%
1980
October1st to 10thDay
51%414%22%8%1
1841
11th to 20thDay
60%7%12%16%6%
1800
21st to endDay
68%48%14%6%
1810
November1st to 10thDay
63%6%10%16%5%
1575
11th to 20thDay
68%6%10%11%5%
1520
21st to endDay
69%6%12%11%1
1520
December1st to 10thDay
74%5%8%9%4
1364
11th to 20thDay
72%6%8%10%4
1668
21st to endDay
71%5%9%9%5%2
2431
January1st to 10thNight
71%9%9%10%1
4748
11th to 20thNight
70%5%7%11%6%
4592
21st to endNight
57%5%9%16%10%2
4845
February1st to 10thNight
63%5%10%13%8%1
2470
11th to 20thNight
69%7%7%10%6%1
2406
21st to endNight
61%6%9%14%9%1
1934
March1st to 10thNight
62%48%18%7%1
2211
11th to 20thNight
63%5%8%15%8%1
2067
21st to endNight
60%5%9%16%9%2
2178
April1st to 10thNight
65%46%12%9%3
1806
11th to 20thNight
51%5%9%18%15%1
1598
21st to endNight
53%6%9%18%13%2
1620
May1st to 10thNight
55%6%9%16%12%2
1620
11th to 20thNight
54%410%21%11%1
1424
21st to endNight
51%7%11%20%11%1
1365
June1st to 10thNight
53%6%11%20%10%1
1260
11th to 20thNight
48%7%13%18%12%2
1260
21st to endNight
57%7%12%14%9%1
1260
July1st to 10thNight
45%9%16%23%6%
1225
11th to 20thNight
46%8%17%20%8%1
1218
21st to endNight
50%9%13%19%8%
1429
August1st to 10thNight
46%9%19%21%5%
1600
11th to 20thNight
46%11%19%19%5%
1596
21st to endNight
42%8%15%27%8%
1782
September1st to 10thNight
41%8%15%26%9%1
1783
11th to 20thNight
45%415%24%11%1
1980
21st to endNight
43%7%12%25%13%1
1980
October1st to 10thNight
49%5%13%22%10%1
2119
11th to 20thNight
56%6%13%20%5%
2160
21st to endNight
63%5%10%16%6%1
2545
November1st to 10thNight
60%5%13%16%6%
2502
11th to 20thNight
67%5%11%13%5%1
2660
21st to endNight
71%6%11%9%31
2660
December1st to 10thNight
73%5%9%10%3
2812
11th to 20thNight
76%5%6%9%3
3532
21st to endNight
69%5%10%10%5%1
5236

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 10thDay
32%21%31%12%31
180
11th to 20thDay
36%26%24%11%21
180
21st to endDay
23%23%33%12%6%2
222
February1st to 10thDay
26%25%28%15%5%1
370
11th to 20thDay
28%27%29%12%3
366
21st to endDay
29%26%28%12%31
357
March1st to 10thDay
28%22%36%12%21
460
11th to 20thDay
29%22%29%14%6%1
449
21st to endDay
29%24%27%13%5%2
462
April1st to 10thDay
34%28%25%10%21
420
11th to 20thDay
35%19%28%13%41
412
21st to endDay
33%21%26%15%32
420
May1st to 10thDay
39%15%29%13%31
423
11th to 20thDay
29%17%28%17%7%1
615
21st to endDay
34%18%28%15%5%
680
June1st to 10thDay
33%17%28%15%7%1
630
11th to 20thDay
29%18%23%20%10%1
630
21st to endDay
31%13%32%18%6%1
630
July1st to 10thDay
22%16%32%20%8%1
620
11th to 20thDay
19%14%33%24%9%1
618
21st to endDay
22%12%35%23%7%1
551
August1st to 10thDay
20%15%36%20%7%2
446
11th to 20thDay
23%14%28%26%9%
439
21st to endDay
25%16%28%18%12%1
495
September1st to 10thDay
24%17%29%19%9%2
450
11th to 20thDay
29%14%30%18%7%2
450
21st to endDay
28%19%29%13%7%4
450
October1st to 10thDay
25%19%27%18%8%3
381
11th to 20thDay
36%17%22%16%8%1
360
21st to endDay
41%19%23%10%5%1
396
November1st to 10thDay
37%18%24%15%5%
365
11th to 20thDay
31%25%26%13%5%1
370
21st to endDay
31%25%26%13%41
370
December1st to 10thDay
33%22%28%11%5%1
214
11th to 20thDay
35%28%27%8%2
180
21st to endDay
35%28%26%9%3
198
January1st to 10thNight
24%23%34%14%4
850
11th to 20thNight
26%25%28%16%4
801
21st to endNight
17%22%33%22%5%
836
February1st to 10thNight
20%30%28%16%5%1
760
11th to 20thNight
27%24%31%14%3
743
21st to endNight
20%19%39%17%41
628
March1st to 10thNight
22%20%36%18%4
760
11th to 20thNight
28%20%27%16%7%1
752
21st to endNight
22%20%30%22%6%1
792
April1st to 10thNight
33%20%25%18%4
640
11th to 20thNight
28%18%26%20%8%
534
21st to endNight
33%13%24%22%6%1
540
May1st to 10thNight
30%13%24%27%5%1
540
11th to 20thNight
30%10%31%23%6%1
532
21st to endNight
22%17%31%25%5%
397
June1st to 10thNight
26%7%28%32%6%1
360
11th to 20thNight
20%10%26%33%12%
360
21st to endNight
26%11%26%29%8%
360
July1st to 10thNight
19%9%34%28%11%
350
11th to 20thNight
14%9%30%34%12%1
348
21st to endNight
20%7%25%34%13%1
399
August1st to 10thNight
18%7%30%32%12%1
538
11th to 20thNight
20%8%24%34%14%1
532
21st to endNight
17%9%28%32%13%1
594
September1st to 10thNight
20%13%30%28%10%
572
11th to 20thNight
24%10%28%26%10%1
720
21st to endNight
23%14%27%26%10%
720
October1st to 10thNight
26%13%27%24%9%1
720
11th to 20thNight
29%16%27%18%9%1
720
21st to endNight
33%22%24%17%41
792
November1st to 10thNight
33%18%25%19%4
785
11th to 20thNight
30%22%24%17%5%1
850
21st to endNight
27%25%29%15%4
850
December1st to 10thNight
28%22%28%16%41
850
11th to 20thNight
31%25%25%15%4
850
21st to endNight
30%26%24%16%41
935
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