Sanikiluaq
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sanikiluaq clear sky chart from 2005-11-06 to 2024-01-16.

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
33%
23734
4%
74713
4%
23686
34%
23686
7%
64840

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
28%
1040
0%
3027
0%
1036
28%
1036
2%
2873
January11th to 20thNight
40%
939
4%
2807
2%
939
41%
939
5%
2507
January21st to endNight
48%
990
8%
2970
8%
990
49%
990
8%
2547
February1st to 10thNight
51%
890
6%
2655
5%
890
51%
890
9%
2236
February11th to 20thNight
53%
702
9%
2275
8%
699
56%
699
10%
1857
February21st to endNight
54%
592
11%
1924
12%
592
56%
592
12%
1501
March1st to 10thNight
49%
720
8%
2202
8%
720
51%
720
11%
1765
March11th to 20thNight
45%
720
10%
1980
7%
720
47%
720
14%
1568
March21st to endNight
46%
792
9%
2124
6%
792
48%
792
14%
1724
April1st to 10thNight
43%
638
10%
1718
7%
638
44%
638
12%
1408
April11th to 20thNight
48%
533
11%
1597
12%
533
50%
533
17%
1200
April21st to endNight
43%
362
8%
1442
11%
362
45%
362
12%
1049
May1st to 10thNight
30%
360
4%
1342
4%
360
31%
360
9%
1069
May11th to 20thNight
29%
354
0%
1202
0%
354
29%
354
9%
999
May21st to endNight
30%
389
0%
1163
0%
388
30%
388
12%
925
June1st to 10thNight
42%
360
0%
1080
0%
360
42%
360
18%
785
June11th to 20thNight
50%
360
0%
918
0%
360
50%
360
25%
658
June21st to endNight
47%
360
0%
900
0%
360
47%
360
19%
692
July1st to 10thNight
44%
350
0%
926
0%
350
44%
350
17%
727
July11th to 20thNight
41%
348
0%
1072
0%
348
41%
348
14%
848
July21st to endNight
42%
394
0%
1301
0%
372
42%
372
12%
999
August1st to 10thNight
32%
358
0%
1245
0%
356
32%
356
8%
1029
August11th to 20thNight
38%
369
5%
1407
7%
369
39%
369
10%
1093
August21st to endNight
38%
594
8%
1782
9%
594
38%
594
12%
1409
September1st to 10thNight
27%
640
4%
1720
3%
640
27%
640
8%
1494
September11th to 20thNight
30%
720
7%
1828
4%
720
30%
720
10%
1555
September21st to endNight
24%
720
6%
2056
3%
720
26%
720
8%
1759
October1st to 10thNight
20%
720
5%
2160
4%
720
21%
720
6%
1893
October11th to 20thNight
18%
720
5%
2228
4%
720
20%
720
4%
2038
October21st to endNight
16%
792
3%
2772
3%
792
18%
792
2%
2572
November1st to 10thNight
14%
740
1%
2592
1%
740
15%
740
1%
2458
November11th to 20thNight
16%
920
1%
2870
1%
920
16%
920
2%
2731
November21st to endNight
16%
1040
2%
3040
1%
1040
17%
1040
2%
2888
December1st to 10thNight
12%
1040
0%
3040
0%
1040
12%
1040
1%
2967
December11th to 20thNight
23%
1038
1%
3762
0%
1037
23%
1037
1%
3612
December21st to endNight
29%
1130
0%
5586
0%
1115
30%
1115
1%
5405

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
14%14%6%11%9%5%7%6%6%6%16%
74960
Night
13%16%7%13%11%6%8%7%6%410%
74858
TransparencyDay
68%6%9%13%5%
74630
Night
75%5%7%9%3
74724
SeeingDay
20%419%28%21%9%
15390
Night
21%419%28%21%7%
23751

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
9%14%7%13%16%9%12%12%6%11
1138
11th to 20thDay
6%11%7%13%11%9%17%10%13%31
1271
21st to endDay
410%6%12%11%9%12%12%14%6%5%
1386
February1st to 10thDay
310%6%11%10%8%14%16%15%6%1
1301
11th to 20thDay
38%5%10%12%7%12%14%15%10%3
1573
21st to endDay
36%48%12%8%9%18%19%8%6%
1332
March1st to 10thDay
7%10%311%12%6%11%14%13%7%5%
1752
11th to 20thDay
5%8%5%10%12%8%10%11%12%7%12%
1980
21st to endDay
9%10%48%10%7%14%13%6%7%14%
2232
April1st to 10thDay
11%12%5%8%11%8%11%7%5%417%
2258
11th to 20thDay
7%8%5%10%11%9%11%6%5%8%20%
2312
21st to endDay
10%11%5%11%10%7%5%45%7%25%
2518
May1st to 10thDay
14%13%6%17%11%45%45%6%16%
2618
11th to 20thDay
12%12%8%20%9%45%445%18%
2691
21st to endDay
13%11%9%14%9%46%5%6%5%19%
3113
June1st to 10thDay
11%11%8%10%7%45%5%5%7%28%
2880
11th to 20thDay
17%8%45%5%3446%8%37%
3038
21st to endDay
16%12%5%7%6%45%5%6%7%28%
3060
July1st to 10thDay
19%11%5%7%7%45%5%5%7%25%
3004
11th to 20thDay
16%12%5%10%7%45%45%6%25%
2849
21st to endDay
17%15%5%7%5%34448%27%
2940
August1st to 10thDay
23%18%5%8%6%34445%19%
2686
11th to 20thDay
21%17%48%6%33347%23%
2490
21st to endDay
20%15%48%7%35%45%6%23%
2574
September1st to 10thDay
24%17%5%9%7%35%6%45%17%
2222
11th to 20thDay
25%18%5%9%8%44445%14%
2129
21st to endDay
24%23%5%9%5%34445%13%
1904
October1st to 10thDay
24%23%5%9%8%35%34412%
1800
11th to 20thDay
23%28%8%10%7%43335%6%
1729
21st to endDay
20%26%9%10%9%45%4436%
1584
November1st to 10thDay
18%25%10%14%9%35%3335%
1486
11th to 20thDay
19%22%13%17%8%343334
1307
21st to endDay
11%18%13%23%11%45%5%434
1140
December1st to 10thDay
9%18%11%24%17%8%5%3112
1140
11th to 20thDay
8%14%10%21%21%9%7%4223
1433
21st to endDay
8%12%9%16%24%10%8%7%312
2090
January1st to 10thNight
10%15%7%14%14%8%13%11%6%21
3027
11th to 20thNight
6%13%6%11%12%8%14%15%10%32
2807
21st to endNight
49%7%12%12%9%13%14%13%43
2970
February1st to 10thNight
5%9%5%10%14%8%14%16%16%4
2655
11th to 20thNight
47%5%10%10%9%14%15%15%8%4
2273
21st to endNight
37%5%10%10%7%12%15%19%6%5%
1924
March1st to 10thNight
6%7%413%11%6%10%15%12%9%7%
2192
11th to 20thNight
5%9%410%11%6%12%12%10%7%13%
1979
21st to endNight
8%11%48%9%8%12%11%6%7%16%
2124
April1st to 10thNight
11%13%410%10%5%11%6%6%7%18%
1718
11th to 20thNight
6%8%6%11%11%410%7%5%9%23%
1597
21st to endNight
11%9%6%10%10%7%5%5%6%7%24%
1442
May1st to 10thNight
14%13%6%17%12%3335%420%
1342
11th to 20thNight
15%13%8%19%8%3444418%
1202
21st to endNight
14%12%9%15%6%35%5%5%7%19%
1163
June1st to 10thNight
13%11%8%11%4236%49%30%
1080
11th to 20thNight
15%9%6%7%433348%37%
918
21st to endNight
18%11%5%7%6%45%5%7%7%25%
900
July1st to 10thNight
18%13%6%8%7%3337%6%25%
954
11th to 20thNight
19%13%7%9%9%34446%22%
1108
21st to endNight
18%16%410%6%35%446%24%
1378
August1st to 10thNight
27%16%5%8%6%34346%17%
1253
11th to 20thNight
18%19%5%10%7%34346%22%
1407
21st to endNight
20%18%47%5%3445%6%23%
1782
September1st to 10thNight
26%17%6%8%7%4444416%
1720
11th to 20thNight
22%17%5%10%7%45%445%17%
1828
21st to endNight
23%25%47%5%44445%15%
2056
October1st to 10thNight
25%23%5%10%6%34435%12%
2160
11th to 20thNight
22%29%6%10%6%344448%
2228
21st to endNight
22%27%8%12%7%45%4436%
2772
November1st to 10thNight
19%27%11%14%8%5%43335%
2592
11th to 20thNight
18%23%13%16%9%45%3334
2870
21st to endNight
10%21%12%21%12%45%4334
3040
December1st to 10thNight
11%16%11%24%19%7%6%2112
3040
11th to 20thNight
7%15%7%21%21%11%7%3213
3769
21st to endNight
11%16%8%16%23%7%8%6%311
5588

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
88%5%431
1139
11th to 20thDay
80%5%8%6%1
1271
21st to endDay
71%4414%6%
1386
February1st to 10thDay
72%5%7%12%4
1301
11th to 20thDay
66%5%9%14%5%
1582
21st to endDay
58%7%9%15%10%
1332
March1st to 10thDay
68%5%8%15%4
1755
11th to 20thDay
63%39%17%8%
1980
21st to endDay
66%6%8%12%7%
2232
April1st to 10thDay
68%5%6%13%9%1
2258
11th to 20thDay
62%47%17%9%1
2312
21st to endDay
59%5%10%18%8%
2518
May1st to 10thDay
70%5%7%13%6%1
2618
11th to 20thDay
69%5%7%13%6%
2695
21st to endDay
64%7%9%15%6%
3113
June1st to 10thDay
54%6%10%21%9%1
2880
11th to 20thDay
47%5%12%24%12%1
3038
21st to endDay
55%7%9%22%6%
3060
July1st to 10thDay
58%7%13%19%2
2923
11th to 20thDay
59%9%12%16%4
2762
21st to endDay
57%7%18%14%4
2777
August1st to 10thDay
68%7%13%11%1
2670
11th to 20thDay
63%7%11%15%4
2490
21st to endDay
61%9%11%15%4
2574
September1st to 10thDay
69%7%10%11%2
2222
11th to 20thDay
73%7%10%9%2
2129
21st to endDay
74%6%8%9%2
1904
October1st to 10thDay
77%6%8%6%3
1800
11th to 20thDay
84%46%5%1
1729
21st to endDay
84%6%6%311
1584
November1st to 10thDay
87%5%441
1486
11th to 20thDay
88%443
1307
21st to endDay
85%5%6%31
1140
December1st to 10thDay
94%221
1140
11th to 20thDay
92%2421
1433
21st to endDay
91%242
2090
January1st to 10thNight
88%5%43
3027
11th to 20thNight
80%46%8%1
2807
21st to endNight
75%46%9%6%
2970
February1st to 10thNight
72%48%11%4
2655
11th to 20thNight
66%7%9%13%4
2275
21st to endNight
61%7%9%15%8%
1924
March1st to 10thNight
64%6%8%17%4
2202
11th to 20thNight
63%5%10%13%10%
1980
21st to endNight
65%410%13%7%
2124
April1st to 10thNight
67%5%5%14%9%
1718
11th to 20thNight
57%5%8%21%10%
1597
21st to endNight
59%5%9%19%7%1
1442
May1st to 10thNight
68%46%14%8%1
1342
11th to 20thNight
71%45%14%5%
1203
21st to endNight
64%5%10%15%6%
1164
June1st to 10thNight
53%6%8%23%10%
1080
11th to 20thNight
49%47%23%17%
918
21st to endNight
56%5%11%21%7%
900
July1st to 10thNight
58%6%12%19%5%
926
11th to 20thNight
62%6%10%19%3
1072
21st to endNight
62%5%12%17%4
1301
August1st to 10thNight
70%6%10%12%1
1245
11th to 20thNight
65%5%11%15%4
1407
21st to endNight
62%7%11%18%2
1782
September1st to 10thNight
73%6%10%10%1
1720
11th to 20thNight
69%7%11%11%3
1828
21st to endNight
73%5%10%9%3
2056
October1st to 10thNight
76%6%9%8%2
2160
11th to 20thNight
81%6%5%6%2
2228
21st to endNight
84%6%5%41
2772
November1st to 10thNight
88%4321
2592
11th to 20thNight
88%5%43
2870
21st to endNight
88%4431
3040
December1st to 10thNight
94%3211
3040
11th to 20thNight
93%2321
3769
21st to endNight
93%3311
5588

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
12%223%37%19%7%
180
11th to 20thDay
14%427%28%19%9%
170
21st to endDay
10%5%18%30%25%13%
176
February1st to 10thDay
2322%30%29%13%
174
11th to 20thDay
5%217%38%30%8%
240
21st to endDay
6%319%34%33%6%
198
March1st to 10thDay
9%419%25%25%17%
320
11th to 20thDay
9%423%35%21%8%
420
21st to endDay
13%421%26%23%12%
462
April1st to 10thDay
15%316%24%22%20%
420
11th to 20thDay
12%219%30%20%17%
412
21st to endDay
17%317%28%21%14%
420
May1st to 10thDay
20%5%18%25%21%13%
521
11th to 20thDay
16%5%22%33%17%7%
660
21st to endDay
16%5%26%32%18%4
874
June1st to 10thDay
16%220%31%20%11%
810
11th to 20thDay
19%319%32%21%7%
810
21st to endDay
23%314%27%28%5%
810
July1st to 10thDay
22%212%28%26%10%
796
11th to 20thDay
20%217%29%25%7%
761
21st to endDay
25%29%24%29%11%
684
August1st to 10thDay
31%411%22%22%10%
626
11th to 20thDay
29%312%21%22%13%
464
21st to endDay
27%5%14%24%21%8%
495
September1st to 10thDay
30%422%26%14%5%
450
11th to 20thDay
33%5%21%23%15%4
450
21st to endDay
35%9%19%24%8%5%
450
October1st to 10thDay
34%9%23%25%7%2
450
11th to 20thDay
34%7%23%23%11%2
391
21st to endDay
19%8%27%26%15%5%
198
November1st to 10thDay
26%7%18%26%18%5%
180
11th to 20thDay
25%8%23%28%13%3
180
21st to endDay
11%426%30%18%11%
180
December1st to 10thDay
17%7%28%23%19%6%
180
11th to 20thDay
16%9%17%31%21%5%
180
21st to endDay
8%5%23%37%21%6%
198
January1st to 10thNight
18%5%20%30%20%8%
1040
11th to 20thNight
13%418%35%23%8%
939
21st to endNight
7%313%33%30%13%
990
February1st to 10thNight
8%414%32%28%14%
890
11th to 20thNight
7%218%31%29%14%
703
21st to endNight
7%220%33%28%11%
592
March1st to 10thNight
9%414%30%33%10%
720
11th to 20thNight
8%326%34%23%6%
720
21st to endNight
13%420%33%21%8%
792
April1st to 10thNight
18%318%29%22%11%
638
11th to 20thNight
9%218%33%25%12%
533
21st to endNight
15%320%32%22%8%
362
May1st to 10thNight
19%5%20%28%20%8%
360
11th to 20thNight
19%5%22%32%17%5%
354
21st to endNight
16%427%32%18%3
389
June1st to 10thNight
18%219%34%19%8%
360
11th to 20thNight
19%417%34%23%3
360
21st to endNight
25%29%32%27%5%
360
July1st to 10thNight
23%112%27%29%8%
350
11th to 20thNight
23%215%33%22%5%
348
21st to endNight
25%210%27%29%6%
394
August1st to 10thNight
37%112%19%25%6%
358
11th to 20thNight
28%311%23%27%8%
369
21st to endNight
30%415%25%18%9%
594
September1st to 10thNight
35%5%19%20%15%6%
640
11th to 20thNight
32%322%22%18%3
720
21st to endNight
40%6%19%19%13%3
720
October1st to 10thNight
40%8%21%20%10%1
720
11th to 20thNight
39%5%18%20%16%2
720
21st to endNight
33%8%20%20%14%6%
792
November1st to 10thNight
33%7%19%22%13%5%
740
11th to 20thNight
29%7%21%23%18%4
920
21st to endNight
20%6%22%28%18%6%
1040
December1st to 10thNight
19%6%22%30%20%3
1040
11th to 20thNight
16%8%18%30%22%6%
1040
21st to endNight
13%5%21%34%20%7%
1144
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