Igloolik
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Igloolik clear sky chart from 2005-11-06 to 2024-01-14.

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
53%
22244
5%
77980
5%
22227
54%
22227
13%
58725

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
65%
1216
6%
4545
6%
1216
66%
1216
15%
3190
January11th to 20thNight
64%
1135
7%
4197
8%
1135
64%
1135
13%
3111
January21st to endNight
70%
1107
12%
3828
11%
1107
72%
1107
21%
2487
February1st to 10thNight
71%
980
7%
3116
7%
980
72%
980
19%
2213
February11th to 20thNight
74%
878
12%
2720
12%
876
75%
876
22%
1853
February21st to endNight
70%
740
12%
2130
11%
740
71%
740
26%
1426
March1st to 10thNight
63%
720
11%
2333
10%
720
64%
720
19%
1614
March11th to 20thNight
69%
720
11%
2042
9%
720
70%
720
26%
1367
March21st to endNight
63%
700
7%
2010
6%
700
64%
700
25%
1367
April1st to 10thNight
62%
522
0%
1602
0%
522
62%
522
24%
1073
April11th to 20thNight
65%
356
0%
1244
0%
356
65%
356
15%
902
April21st to endNight
45%
360
0%
1004
0%
360
45%
360
15%
787
May1st to 10thNight
46%
290
0%
718
0%
290
46%
290
18%
567
May11th to 20thNight
32%
68
0%
346
0%
68
32%
68
4%
269
May21st to endNight0
0%
400
0%
4
June1st to 10thNight00000
June11th to 20thNight00000
June21st to endNight00000
July1st to 10thNight00000
July11th to 20thNight00000
July21st to endNight
50%
68
0%
264
0%
65
50%
65
10%
180
August1st to 10thNight
57%
226
0%
652
0%
225
56%
225
22%
452
August11th to 20thNight
51%
356
0%
929
0%
356
51%
356
21%
682
August21st to endNight
41%
396
0%
1386
0%
396
41%
396
12%
1061
September1st to 10thNight
47%
504
0%
1566
0%
504
47%
504
16%
1133
September11th to 20thNight
40%
643
2%
1764
1%
643
40%
643
11%
1455
September21st to endNight
30%
720
4%
2041
3%
720
31%
720
9%
1752
October1st to 10thNight
25%
720
3%
2279
2%
720
25%
720
7%
1960
October11th to 20thNight
18%
754
2%
2554
2%
754
19%
754
4%
2294
October21st to endNight
33%
1062
3%
3114
2%
1062
35%
1062
6%
2770
November1st to 10thNight
54%
1015
4%
3249
3%
1015
55%
1015
11%
2604
November11th to 20thNight
38%
1040
3%
3673
2%
1040
39%
1040
8%
3049
November21st to endNight
49%
1195
5%
4333
5%
1195
49%
1195
9%
3486
December1st to 10thNight
49%
1220
4%
4560
3%
1220
50%
1220
8%
3739
December11th to 20thNight
53%
1219
8%
5591
8%
1219
55%
1219
11%
3942
December21st to endNight
54%
1314
2%
8186
4%
1303
54%
1303
7%
5936

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
11%10%5%9%8%5%6%6%6%8%27%
76105
Night
5%8%5%11%11%7%9%8%8%9%17%
78251
TransparencyDay
53%8%16%19%4
75612
Night
58%8%16%15%4
78238
SeeingDay
14%210%23%31%20%
17720
Night
9%210%25%34%20%
22280

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
January11th to 20thDay
25%39%16%12%7%9%12%9%17%
58
21st to endDay
329%11%7%8%12%13%13%23%
527
February1st to 10thDay
1338%8%10%9%14%12%16%15%
844
11th to 20thDay
326%12%7%11%13%11%15%20%
1131
21st to endDay
1428%8%7%11%8%10%20%22%
1123
March1st to 10thDay
16%410%9%8%10%8%9%11%25%
1625
11th to 20thDay
25%27%10%6%9%9%11%11%28%
1917
21st to endDay
25%49%9%6%9%10%11%13%22%
2362
April1st to 10thDay
310%5%8%7%6%7%7%7%10%31%
2358
11th to 20thDay
46%5%8%10%8%9%8%7%8%28%
2668
21st to endDay
411%5%12%10%6%9%6%5%6%24%
2956
May1st to 10thDay
8%10%6%11%10%45%5%5%7%28%
3240
11th to 20thDay
5%12%8%13%10%46%5%6%6%24%
3547
21st to endDay
9%12%7%13%10%45%5%5%7%23%
4625
June1st to 10thDay
13%13%6%9%6%45%5%6%7%25%
4320
11th to 20thDay
15%12%5%8%6%35%5%5%6%29%
4320
21st to endDay
15%9%5%7%6%35%5%6%8%32%
4320
July1st to 10thDay
8%6%36%5%45%5%7%10%42%
4320
11th to 20thDay
17%9%46%7%45%6%6%7%28%
4320
21st to endDay
16%9%46%6%35%5%6%8%32%
4095
August1st to 10thDay
15%7%26%5%345%6%7%39%
3284
11th to 20thDay
17%10%36%5%3445%7%35%
2972
21st to endDay
20%11%49%6%4445%6%28%
2970
September1st to 10thDay
15%9%48%5%44448%35%
2394
11th to 20thDay
14%16%8%11%7%35%5%6%6%19%
2175
21st to endDay
20%15%8%13%6%33335%20%
1920
October1st to 10thDay
13%19%7%19%7%4333417%
1679
11th to 20thDay
15%20%6%20%13%443438%
1404
21st to endDay
8%19%6%11%15%9%7%5%4412%
1242
November1st to 10thDay
28%410%17%12%14%9%6%6%14%
828
11th to 20thDay
8%11%9%13%13%7%12%7%6%5%8%
508
21st to endDay
8%17%8%9%21%29%26%8%11%
53
January1st to 10thNight
25%48%10%7%12%12%11%12%18%
4545
11th to 20thNight
14412%14%7%10%10%10%13%14%
4197
21st to endNight
1327%10%8%10%10%12%15%21%
3828
February1st to 10thNight
2428%8%8%13%12%13%13%15%
3116
11th to 20thNight
1228%11%6%11%12%13%15%19%
2716
21st to endNight
1238%11%5%11%10%12%15%22%
2130
March1st to 10thNight
17%5%8%11%7%10%9%9%10%24%
2333
11th to 20thNight
2338%9%6%9%9%11%12%27%
2042
21st to endNight
1439%10%6%8%10%12%13%22%
2010
April1st to 10thNight
29%6%9%8%46%7%7%11%31%
1602
11th to 20thNight
5%7%36%10%8%11%10%6%8%25%
1244
21st to endNight
7%10%5%12%14%6%8%5%47%21%
1004
May1st to 10thNight
9%11%5%15%9%5%6%5%5%8%23%
718
11th to 20thNight
7%13%7%21%11%36%5%2320%
346
21st to endNight
25%25%25%25%
4
July21st to endNight
14%10%29%6%8%8%348%27%
278
August1st to 10thNight
16%8%35%5%45%45%7%39%
655
11th to 20thNight
16%11%47%5%3345%7%35%
929
21st to endNight
23%12%47%7%3435%6%24%
1386
September1st to 10thNight
14%13%47%7%4445%6%33%
1566
11th to 20thNight
13%19%8%9%7%45%45%7%19%
1764
21st to endNight
19%17%10%14%6%3443417%
2041
October1st to 10thNight
13%18%10%22%6%2334316%
2279
11th to 20thNight
13%20%9%20%13%343339%
2554
21st to endNight
9%14%8%16%15%8%7%5%449%
3114
November1st to 10thNight
26%411%16%15%13%8%5%7%14%
3249
11th to 20thNight
7%11%8%15%14%7%11%8%5%49%
3673
21st to endNight
5%12%8%11%11%8%11%8%8%8%10%
4333
December1st to 10thNight
19%6%15%15%8%10%10%7%7%10%
4560
11th to 20thNight
36%5%9%12%7%11%10%13%12%13%
5675
21st to endNight
16%5%14%14%8%10%8%8%9%16%
8360

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
January11th to 20thDay
60%221%10%7%
58
21st to endDay
43%10%17%18%13%
527
February1st to 10thDay
44%13%21%22%1
844
11th to 20thDay
43%10%22%18%8%
1137
21st to endDay
40%6%22%18%13%
1123
March1st to 10thDay
48%7%18%17%10%1
1625
11th to 20thDay
42%8%17%21%10%1
1919
21st to endDay
46%7%15%23%9%
2362
April1st to 10thDay
47%7%12%21%11%1
2358
11th to 20thDay
50%7%10%24%8%
2668
21st to endDay
59%7%9%17%8%
2956
May1st to 10thDay
55%7%9%22%7%
3240
11th to 20thDay
60%8%12%17%3
3551
21st to endDay
60%9%13%15%2
4626
June1st to 10thDay
56%9%14%19%2
4320
11th to 20thDay
55%7%14%23%2
4320
21st to endDay
48%9%19%21%3
4320
July1st to 10thDay
36%10%21%29%4
4201
11th to 20thDay
52%10%19%18%2
4185
21st to endDay
47%10%18%22%2
3865
August1st to 10thDay
43%9%22%21%4
3262
11th to 20thDay
49%8%19%21%4
2972
21st to endDay
56%8%21%15%1
2970
September1st to 10thDay
48%10%26%15%1
2394
11th to 20thDay
64%9%16%11%1
2175
21st to endDay
68%7%12%12%1
1920
October1st to 10thDay
72%5%11%11%1
1679
11th to 20thDay
81%5%10%22
1404
21st to endDay
72%7%12%6%3
1242
November1st to 10thDay
61%12%17%9%
828
11th to 20thDay
71%6%11%10%3
508
21st to endDay
70%6%9%15%
53
January1st to 10thNight
49%10%21%18%2
4545
11th to 20thNight
56%8%18%15%3
4197
21st to endNight
43%8%18%20%11%
3828
February1st to 10thNight
48%9%22%20%1
3116
11th to 20thNight
44%9%20%20%6%
2720
21st to endNight
41%8%19%19%11%1
2130
March1st to 10thNight
50%6%17%19%9%
2333
11th to 20thNight
41%8%20%20%10%1
2042
21st to endNight
45%6%17%20%12%
2010
April1st to 10thNight
45%5%15%24%10%1
1602
11th to 20thNight
53%8%8%22%9%
1244
21st to endNight
60%6%8%19%7%1
1004
May1st to 10thNight
57%8%8%22%5%
718
11th to 20thNight
71%48%15%3
346
21st to endNight
75%25%
4
July21st to endNight
53%8%18%18%2
264
August1st to 10thNight
45%9%19%23%4
652
11th to 20thNight
51%6%17%23%3
929
21st to endNight
61%7%20%12%1
1386
September1st to 10thNight
52%8%26%13%1
1566
11th to 20thNight
64%8%15%12%
1764
21st to endNight
72%6%10%11%1
2041
October1st to 10thNight
74%5%11%9%
2279
11th to 20thNight
82%48%42
2554
21st to endNight
76%7%10%6%1
3114
November1st to 10thNight
61%10%17%10%2
3249
11th to 20thNight
70%6%14%8%1
3673
21st to endNight
65%8%14%13%1
4333
December1st to 10thNight
65%10%12%11%2
4560
11th to 20thNight
54%8%19%18%2
5675
21st to endNight
59%7%12%15%7%1
8360

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
January21st to endDay
19%24%36%30%
80
February1st to 10thDay
1124%45%29%
136
11th to 20thDay
15%13%36%45%
160
21st to endDay
1224%40%32%
172
March1st to 10thDay
3212%22%33%29%
240
11th to 20thDay
210%24%31%33%
359
21st to endDay
319%24%35%29%
462
April1st to 10thDay
8%28%20%32%31%
420
11th to 20thDay
5%16%21%35%32%
590
21st to endDay
9%311%24%29%24%
748
May1st to 10thDay
11%29%23%31%24%
783
11th to 20thDay
10%313%29%28%17%
876
21st to endDay
13%28%19%34%24%
1259
June1st to 10thDay
16%39%23%30%20%
1170
11th to 20thDay
19%211%25%26%17%
1170
21st to endDay
17%29%27%32%14%
1170
July1st to 10thDay
10%110%25%35%19%
1146
11th to 20thDay
20%39%23%30%16%
1140
21st to endDay
17%311%21%28%20%
1058
August1st to 10thDay
17%17%22%35%18%
805
11th to 20thDay
21%39%21%27%18%
767
21st to endDay
21%312%24%23%17%
693
September1st to 10thDay
19%39%20%34%15%
468
11th to 20thDay
21%29%22%25%21%
450
21st to endDay
25%210%22%29%12%
450
October1st to 10thDay
21%7%16%25%23%7%
329
11th to 20thDay
21%6%17%20%22%14%
180
21st to endDay
11%411%34%26%14%
198
November1st to 10thDay
228%33%38%16%
180
11th to 20thDay
5%5%11%33%30%16%
61
January1st to 10thNight
317%23%39%27%
1220
11th to 20thNight
26%29%40%23%
1135
21st to endNight
28%25%40%24%
1107
February1st to 10thNight
38%21%39%30%
980
11th to 20thNight
2420%39%35%
881
21st to endNight
117%23%42%25%
740
March1st to 10thNight
329%27%34%25%
720
11th to 20thNight
39%29%41%18%
720
21st to endNight
3111%23%40%22%
700
April1st to 10thNight
7%17%27%40%18%
522
11th to 20thNight
8%6%26%38%22%
356
21st to endNight
11%210%24%32%22%
360
May1st to 10thNight
15%210%26%31%17%
290
11th to 20thNight
15%18%26%22%19%
68
July21st to endNight
18%310%24%38%7%
68
August1st to 10thNight
21%19%25%32%12%
226
11th to 20thNight
22%310%27%30%9%
356
21st to endNight
30%210%23%27%9%
396
September1st to 10thNight
20%412%21%34%9%
504
11th to 20thNight
21%212%24%27%14%
643
21st to endNight
25%412%23%26%11%
720
October1st to 10thNight
21%416%23%28%7%
720
11th to 20thNight
22%5%17%25%21%8%
754
21st to endNight
15%310%29%30%13%
1062
November1st to 10thNight
4210%30%37%18%
1015
11th to 20thNight
9%316%27%29%15%
1040
21st to endNight
9%312%21%35%21%
1195
December1st to 10thNight
4211%32%29%22%
1220
11th to 20thNight
5%115%26%31%22%
1220
21st to endNight
3110%24%37%25%
1342
Page generated at 2024-01-11 03:22:37. Version ac07

Copyright 2024 Attilla Danko


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