Carmacks
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carmacks clear sky chart from 2005-11-06 to 2024-03-01.

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
42%
22369
8%
82217
6%
22282
44%
22282
13%
60234

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
44%
1014
9%
5630
9%
1006
46%
1006
7%
4530
January11th to 20thNight
35%
849
14%
5251
8%
835
40%
835
6%
3696
January21st to endNight
37%
925
7%
5618
8%
902
43%
902
6%
4288
February1st to 10thNight
44%
850
15%
2869
12%
850
48%
850
15%
2073
February11th to 20thNight
43%
834
12%
2652
8%
830
46%
830
17%
1902
February21st to endNight
50%
703
15%
2065
10%
703
54%
703
22%
1406
March1st to 10thNight
45%
756
17%
2241
14%
756
48%
756
22%
1533
March11th to 20thNight
44%
622
11%
2062
11%
622
47%
622
19%
1424
March21st to endNight
50%
594
13%
2029
11%
594
54%
594
22%
1316
April1st to 10thNight
50%
540
9%
1726
6%
540
52%
540
21%
1153
April11th to 20thNight
48%
533
7%
1425
5%
533
50%
533
23%
990
April21st to endNight
52%
527
0%
1390
0%
527
52%
527
28%
934
May1st to 10thNight
46%
360
0%
1080
0%
360
46%
360
22%
695
May11th to 20thNight
46%
354
0%
1062
0%
354
46%
354
29%
654
May21st to endNight
51%
198
0%
802
0%
197
51%
197
24%
463
June1st to 10thNight
50%
180
0%
720
0%
180
50%
180
18%
449
June11th to 20thNight
47%
180
0%
720
0%
180
47%
180
14%
487
June21st to endNight
47%
180
0%
720
0%
180
47%
180
14%
497
July1st to 10thNight
53%
175
0%
700
0%
175
53%
175
20%
448
July11th to 20thNight
45%
174
0%
759
0%
174
45%
174
14%
513
July21st to endNight
49%
284
0%
1013
0%
269
47%
269
17%
673
August1st to 10thNight
51%
378
0%
1088
0%
376
50%
376
24%
731
August11th to 20thNight
42%
534
0%
1316
0%
534
42%
534
20%
992
August21st to endNight
45%
594
3%
1584
2%
594
46%
594
19%
1191
September1st to 10thNight
41%
540
6%
1718
5%
540
42%
540
15%
1244
September11th to 20thNight
52%
540
13%
1800
12%
540
56%
540
22%
1168
September21st to endNight
39%
678
11%
2050
7%
678
43%
678
16%
1474
October1st to 10thNight
37%
720
11%
2160
7%
720
40%
720
16%
1576
October11th to 20thNight
37%
754
9%
2394
8%
754
39%
754
14%
1798
October21st to endNight
40%
891
5%
2790
3%
891
42%
891
14%
2138
November1st to 10thNight
38%
830
7%
2851
7%
830
40%
830
11%
2220
November11th to 20thNight
34%
850
6%
3040
5%
850
37%
850
8%
2486
November21st to endNight
33%
1015
7%
3256
4%
1015
36%
1015
10%
2584
December1st to 10thNight
35%
1040
7%
3420
6%
1040
36%
1040
9%
2747
December11th to 20thNight
38%
1039
10%
4114
7%
1039
40%
1039
9%
3190
December21st to endNight
40%
1134
6%
6102
8%
1114
43%
1114
6%
4571

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%9%5%7%7%7%8%24%
76552
Night
5%11%6%12%10%6%8%7%7%8%21%
82806
TransparencyDay
56%315%19%6%
76192
Night
59%413%17%7%1
82747
SeeingDay
15%7%21%29%21%7%
16085
Night
12%6%16%33%27%7%
22432

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 10thDay
29%6%18%14%9%13%8%8%6%8%
1261
11th to 20thDay
312%7%14%14%8%8%5%5%11%12%
1565
21st to endDay
210%6%14%12%6%9%7%7%9%16%
2001
February1st to 10thDay
29%7%13%10%6%9%8%8%10%19%
1308
11th to 20thDay
410%5%12%11%7%8%7%8%10%18%
1419
21st to endDay
19%5%12%11%7%10%9%6%8%22%
1387
March1st to 10thDay
29%6%13%11%6%8%7%6%8%25%
1725
11th to 20thDay
211%7%13%9%5%7%5%7%9%25%
1896
21st to endDay
18%6%11%9%5%7%6%5%7%35%
2327
April1st to 10thDay
313%5%12%9%5%6%7%6%9%26%
2232
11th to 20thDay
5%12%49%9%5%7%6%6%8%29%
2484
21st to endDay
5%10%5%9%9%5%7%6%6%7%30%
2569
May1st to 10thDay
6%9%49%9%5%6%7%6%9%29%
2880
11th to 20thDay
7%9%47%7%46%6%7%9%31%
2833
21st to endDay
6%7%48%8%47%6%7%10%32%
3471
June1st to 10thDay
9%8%49%10%5%8%7%7%8%26%
3240
11th to 20thDay
11%10%5%10%9%5%6%6%6%8%22%
3240
21st to endDay
13%8%48%10%5%9%7%8%9%21%
3240
July1st to 10thDay
10%6%37%8%6%8%7%8%9%28%
3240
11th to 20thDay
14%9%5%9%9%5%7%7%7%7%22%
3175
21st to endDay
13%8%48%7%5%8%6%7%9%26%
3244
August1st to 10thDay
11%8%48%7%48%7%7%9%27%
2844
11th to 20thDay
15%9%38%8%5%7%7%7%9%22%
2584
21st to endDay
16%9%38%8%47%7%7%9%21%
2772
September1st to 10thDay
13%10%49%8%5%7%6%5%9%24%
2241
11th to 20thDay
10%7%37%8%5%6%6%8%8%32%
2160
21st to endDay
13%10%48%7%5%7%6%6%7%27%
1908
October1st to 10thDay
11%11%49%8%6%7%6%7%7%24%
1800
11th to 20thDay
9%15%5%9%9%47%7%6%7%21%
1563
21st to endDay
7%12%7%10%11%5%6%5%7%7%22%
1566
November1st to 10thDay
414%10%12%10%6%9%6%6%6%16%
1226
11th to 20thDay
5%15%8%12%12%6%10%6%7%5%13%
1140
21st to endDay
413%6%14%10%6%8%11%8%6%15%
903
December1st to 10thDay
49%7%18%14%6%7%8%9%8%9%
760
11th to 20thDay
411%6%12%11%6%8%12%8%11%13%
962
21st to endDay
313%7%13%12%5%7%7%8%10%16%
1386
January1st to 10thNight
310%5%14%15%10%11%9%7%5%11%
5686
11th to 20thNight
314%8%14%10%5%7%5%8%12%14%
5361
21st to endNight
412%6%16%13%6%9%8%7%7%13%
5654
February1st to 10thNight
28%7%13%12%6%8%7%7%9%21%
2869
11th to 20thNight
29%5%12%11%6%8%7%8%9%23%
2648
21st to endNight
18%410%8%7%8%8%7%9%31%
2065
March1st to 10thNight
28%5%14%9%5%5%5%7%7%33%
2241
11th to 20thNight
111%6%10%10%5%7%6%7%7%29%
2060
21st to endNight
29%411%8%5%7%6%7%7%35%
2029
April1st to 10thNight
310%5%10%10%45%6%6%9%32%
1726
11th to 20thNight
38%5%10%9%5%7%7%8%7%30%
1425
21st to endNight
5%8%47%7%5%6%8%8%9%34%
1390
May1st to 10thNight
46%48%7%6%7%7%8%10%32%
1080
11th to 20thNight
8%6%37%5%35%6%8%10%38%
1062
21st to endNight
6%6%37%5%5%6%8%7%11%36%
802
June1st to 10thNight
8%8%36%7%49%7%9%9%30%
720
11th to 20thNight
9%8%39%9%5%7%8%9%8%25%
720
21st to endNight
12%7%49%8%48%9%11%8%20%
720
July1st to 10thNight
9%7%38%7%5%5%8%8%11%30%
720
11th to 20thNight
12%9%410%6%5%8%7%8%8%24%
783
21st to endNight
12%9%27%7%46%6%6%10%31%
1072
August1st to 10thNight
9%6%37%7%47%6%7%10%33%
1094
11th to 20thNight
14%9%47%7%47%8%7%8%25%
1316
21st to endNight
12%8%5%10%8%5%7%6%9%8%22%
1584
September1st to 10thNight
10%8%410%8%5%8%7%7%9%25%
1718
11th to 20thNight
7%6%37%8%6%8%6%7%9%34%
1800
21st to endNight
11%11%49%7%5%7%6%7%7%25%
2050
October1st to 10thNight
12%11%48%8%5%6%5%6%8%27%
2160
11th to 20thNight
10%19%6%9%7%5%5%5%5%6%24%
2394
21st to endNight
6%16%6%11%10%46%6%7%8%21%
2790
November1st to 10thNight
7%14%6%14%11%5%7%7%6%6%18%
2851
11th to 20thNight
414%9%17%13%6%8%6%5%5%13%
3040
21st to endNight
6%14%6%13%12%6%8%9%8%5%13%
3256
December1st to 10thNight
6%12%7%14%14%6%8%7%8%8%12%
3420
11th to 20thNight
311%7%13%13%6%10%8%8%9%12%
4230
21st to endNight
6%14%6%11%11%6%9%7%8%7%15%
6270

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
72%35%12%6%2
1261
11th to 20thDay
67%27%9%15%
1580
21st to endDay
61%310%16%8%1
2001
February1st to 10thDay
54%49%19%13%1
1308
11th to 20thDay
59%412%14%10%
1426
21st to endDay
57%414%17%8%
1387
March1st to 10thDay
56%311%22%7%1
1725
11th to 20thDay
54%415%17%10%
1896
21st to endDay
48%316%18%13%1
2327
April1st to 10thDay
54%416%19%6%
2232
11th to 20thDay
52%315%22%8%
2484
21st to endDay
50%313%24%9%
2569
May1st to 10thDay
49%316%26%6%
2880
11th to 20thDay
48%211%26%12%
2836
21st to endDay
47%312%26%11%
3472
June1st to 10thDay
56%211%23%7%1
3240
11th to 20thDay
60%311%22%5%
3240
21st to endDay
58%317%20%3
3240
July1st to 10thDay
50%416%23%6%1
3151
11th to 20thDay
59%418%15%4
3076
21st to endDay
54%324%15%3
3063
August1st to 10thDay
52%424%16%3
2825
11th to 20thDay
58%5%19%16%2
2584
21st to endDay
59%324%13%1
2772
September1st to 10thDay
57%319%18%3
2241
11th to 20thDay
48%324%22%3
2160
21st to endDay
56%318%20%4
1908
October1st to 10thDay
57%6%17%17%3
1800
11th to 20thDay
59%5%20%12%3
1563
21st to endDay
59%5%17%16%3
1566
November1st to 10thDay
62%5%13%17%2
1226
11th to 20thDay
68%413%12%3
1140
21st to endDay
62%5%13%15%5%
903
December1st to 10thDay
67%7%14%9%4
760
11th to 20thDay
59%37%15%15%1
964
21st to endDay
60%310%20%7%
1386
January1st to 10thNight
70%37%12%6%1
5686
11th to 20thNight
61%27%13%12%5%
5408
21st to endNight
67%47%15%5%2
5654
February1st to 10thNight
55%5%8%19%12%1
2869
11th to 20thNight
53%5%11%21%9%1
2652
21st to endNight
48%416%20%12%
2065
March1st to 10thNight
49%311%26%10%
2241
11th to 20thNight
53%313%21%10%1
2062
21st to endNight
46%415%21%13%1
2029
April1st to 10thNight
49%318%21%8%
1726
11th to 20thNight
49%314%26%8%
1425
21st to endNight
44%316%27%10%
1390
May1st to 10thNight
45%418%25%9%
1080
11th to 20thNight
40%312%31%15%1
1062
21st to endNight
41%313%32%11%
802
June1st to 10thNight
46%314%28%7%1
720
11th to 20thNight
52%5%12%25%5%1
720
21st to endNight
54%416%21%4
720
July1st to 10thNight
47%418%24%6%2
700
11th to 20thNight
56%223%15%4
759
21st to endNight
51%324%18%4
1013
August1st to 10thNight
44%6%25%21%4
1088
11th to 20thNight
55%417%20%4
1316
21st to endNight
57%324%16%1
1584
September1st to 10thNight
56%419%19%2
1718
11th to 20thNight
46%424%23%4
1800
21st to endNight
56%317%19%5%
2050
October1st to 10thNight
55%416%20%4
2160
11th to 20thNight
61%319%14%2
2394
21st to endNight
60%5%20%12%3
2790
November1st to 10thNight
64%415%14%3
2851
11th to 20thNight
71%310%12%3
3040
21st to endNight
66%5%11%16%3
3256
December1st to 10thNight
67%5%13%12%3
3420
11th to 20thNight
64%49%14%7%2
4227
21st to endNight
64%46%14%9%3
6270

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
4212%29%43%9%
90
11th to 20thDay
9%11%38%19%23%
90
21st to endDay
8%7%19%32%22%12%
175
February1st to 10thDay
7%417%38%24%11%
348
11th to 20thDay
9%5%17%35%21%13%
365
21st to endDay
6%7%23%38%21%5%
307
March1st to 10thDay
6%9%25%26%21%12%
341
11th to 20thDay
6%9%28%31%18%8%
340
21st to endDay
7%8%28%29%21%8%
441
April1st to 10thDay
12%10%26%27%19%6%
492
11th to 20thDay
13%11%24%27%20%5%
590
21st to endDay
13%11%24%32%16%6%
600
May1st to 10thDay
16%14%28%26%12%4
603
11th to 20thDay
14%10%27%27%15%6%
625
21st to endDay
14%9%27%27%19%5%
850
June1st to 10thDay
16%6%17%31%25%6%
810
11th to 20thDay
18%6%18%30%22%6%
810
21st to endDay
17%5%17%28%25%8%
810
July1st to 10thDay
14%5%18%28%27%8%
796
11th to 20thDay
18%417%29%23%9%
727
21st to endDay
19%314%29%26%8%
684
August1st to 10thDay
15%423%29%21%8%
626
11th to 20thDay
22%7%25%26%16%4
615
21st to endDay
18%6%21%32%19%4
693
September1st to 10thDay
21%9%20%20%20%9%
522
11th to 20thDay
16%7%21%26%22%8%
450
21st to endDay
24%13%23%21%14%5%
392
October1st to 10thDay
19%11%27%21%15%7%
360
11th to 20thDay
21%10%20%22%19%8%
360
21st to endDay
16%6%16%30%24%8%
378
November1st to 10thDay
17%6%21%27%23%6%
180
11th to 20thDay
11%412%34%28%10%
180
21st to endDay
9%6%16%35%19%14%
156
December1st to 10thDay
7%414%33%30%11%
90
11th to 20thDay
14%116%31%24%13%
90
21st to endDay
6%7%17%23%30%16%
99
January1st to 10thNight
6%5%13%35%32%9%
1040
11th to 20thNight
10%5%15%41%25%5%
865
21st to endNight
10%421%37%22%6%
935
February1st to 10thNight
6%415%41%28%6%
850
11th to 20thNight
6%7%19%39%24%6%
834
21st to endNight
6%5%20%42%24%4
703
March1st to 10thNight
7%7%20%33%27%7%
756
11th to 20thNight
5%5%22%33%27%7%
622
21st to endNight
6%6%20%29%31%8%
594
April1st to 10thNight
9%6%18%31%29%7%
540
11th to 20thNight
7%5%19%34%29%6%
533
21st to endNight
8%8%16%28%33%7%
527
May1st to 10thNight
12%10%17%28%29%4
360
11th to 20thNight
12%8%23%28%26%1
354
21st to endNight
9%5%25%26%32%3
198
June1st to 10thNight
13%7%18%26%29%7%
180
11th to 20thNight
16%6%12%29%33%3
180
21st to endNight
14%8%16%24%32%6%
180
July1st to 10thNight
14%214%29%38%3
175
11th to 20thNight
18%316%22%32%9%
174
21st to endNight
17%5%13%24%35%7%
284
August1st to 10thNight
12%418%29%31%5%
378
11th to 20thNight
20%7%16%26%25%7%
534
21st to endNight
16%415%28%31%6%
594
September1st to 10thNight
18%8%16%25%25%8%
540
11th to 20thNight
12%8%16%33%26%5%
540
21st to endNight
19%9%16%27%21%7%
678
October1st to 10thNight
20%11%18%27%20%5%
720
11th to 20thNight
21%7%11%29%26%6%
754
21st to endNight
14%5%14%35%25%7%
891
November1st to 10thNight
15%5%13%35%24%7%
830
11th to 20thNight
10%317%34%30%7%
850
21st to endNight
14%5%19%30%23%8%
1015
December1st to 10thNight
13%415%37%26%7%
1040
11th to 20thNight
13%315%36%26%7%
1040
21st to endNight
9%5%12%35%28%11%
1144
Page generated at 2024-02-27 03:30:19. Version ac07

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