Qikiqtarjuaq
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Qikiqtarjuaq clear sky chart from 2005-11-05 to 2017-11-30.

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
0%
3453
0%
34504
0%
2383
0%
2383
13%
33565

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
0%
85
0%
2818
0%
67
0%
67
13%
2645
January16th to endNight
0%
149
0%
2617
0%
123
0%
123
16%
2423
February1st to 15thNight
0%
151
0%
2183
0%
96
0%
96
12%
2043
February16th to endNight
0%
76
0%
1507
0%
47
0%
47
18%
1443
March1st to 15thNight
0%
186
0%
1181
0%
51
0%
51
19%
1345
March16th to endNight
0%
222
0%
1266
0%
90
0%
90
13%
1375
April1st to 15thNight
0%
89
0%
966
0%
55
0%
55
23%
1049
April16th to endNight
0%
42
0%
765
0%
36
0%
36
17%
806
May1st to 15thNight
0%
92
0%
533
0%
76
0%
76
13%
573
May16th to endNight
0%
42
0%
267
0%
36
0%
36
14%
270
June1st to 15thNight00000
June16th to endNight00000
July1st to 15thNight0
0%
3000
0%
20
July16th to endNight
0%
47
0%
380
0%
38
0%
38
14%
335
August1st to 15thNight
0%
125
0%
647
0%
82
0%
82
13%
624
August16th to endNight
0%
223
0%
956
0%
147
0%
147
7%
975
September1st to 15thNight
0%
211
0%
1362
0%
196
0%
196
12%
1282
September16th to endNight
0%
265
0%
1701
0%
245
0%
245
8%
1650
October1st to 15thNight
0%
281
0%
1884
0%
259
0%
259
11%
1828
October16th to endNight
0%
194
0%
2236
0%
166
0%
166
13%
2092
November1st to 15thNight
0%
238
0%
2240
0%
128
0%
128
12%
2206
November16th to endNight
0%
315
0%
2552
0%
171
0%
171
11%
2579
December1st to 15thNight
0%
228
0%
3007
0%
158
0%
158
10%
2855
December16th to endNight
0%
192
0%
3406
0%
116
0%
116
11%
3147

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
TransparencyDay
49%8%12%11%314%
49767
Night
49%8%13%11%312%
47931
SeeingDay
24%5%6%16%23%23%
9189
Night
13%47%22%30%22%
13788

By Month

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
56%7%14%16%5%
130
16th to endDay
49%8%18%14%7%1
684
February1st to 15thDay
47%11%17%11%47%
1006
16th to endDay
40%9%17%18%6%8%
1212
March1st to 15thDay
32%8%11%14%9%23%
1714
16th to endDay
42%6%9%10%7%24%
2214
April1st to 15thDay
41%5%10%20%8%13%
2418
16th to endDay
44%6%9%14%10%13%
2789
May1st to 15thDay
50%45%9%425%
3150
16th to endDay
46%6%9%11%125%
3771
June1st to 15thDay
49%7%12%13%213%
4289
16th to endDay
53%8%10%11%213%
4320
July1st to 15thDay
54%10%18%14%1
3936
16th to endDay
51%16%19%12%
3475
August1st to 15thDay
40%11%13%5%28%
3048
16th to endDay
48%8%10%427%
2837
September1st to 15thDay
57%8%13%11%16%
2312
16th to endDay
64%9%12%6%15%
1974
October1st to 15thDay
57%9%11%11%45%
1638
16th to endDay
53%11%13%12%44
1358
November1st to 15thDay
50%8%13%11%312%
934
16th to endDay
63%7%9%9%26%
524
December1st to 15thDay
70%8%8%5%5%
34
January1st to 15thNight
48%9%14%18%35%
3906
16th to endNight
47%9%17%13%5%6%
3538
February1st to 15thNight
50%9%15%9%311%
2858
16th to endNight
39%11%16%16%5%11%
2259
March1st to 15thNight
35%6%10%12%7%26%
2244
16th to endNight
46%5%10%8%5%23%
2010
April1st to 15thNight
42%7%12%17%8%10%
1536
16th to endNight
50%6%8%14%9%10%
1174
May1st to 15thNight
56%46%11%119%
801
16th to endNight
53%11%11%9%13%
346
July1st to 15thNight
55%229%8%2
34
16th to endNight
50%15%22%11%
430
August1st to 15thNight
43%12%17%322%
886
16th to endNight
51%9%9%425%
1353
September1st to 15thNight
57%10%15%11%15%
1647
16th to endNight
67%7%9%7%15%
1983
October1st to 15thNight
60%8%11%10%16%
2320
16th to endNight
51%11%15%9%5%6%
2865
November1st to 15thNight
48%7%12%10%118%
3252
16th to endNight
50%7%10%9%319%
3759
December1st to 15thNight
52%8%12%12%311%
4122
16th to endNight
49%9%14%12%310%
4608

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
33%33%33%
3
16th to endDay
9%14%31%26%17%
41
February1st to 15thDay
6%113%50%28%
60
16th to endDay
19%431%29%23%
108
March1st to 15thDay
19%10%315%26%25%
247
16th to endDay
21%9%321%19%23%
288
April1st to 15thDay
12%5%5%14%24%38%
350
16th to endDay
11%5%6%16%25%33%
450
May1st to 15thDay
31%8%7%18%19%14%
639
16th to endDay
28%7%5%16%19%22%
841
June1st to 15thDay
22%46%16%23%25%
1019
16th to endDay
29%45%17%25%16%
1035
July1st to 15thDay
21%15%12%27%30%
935
16th to endDay
20%25%13%23%34%
773
August1st to 15thDay
35%5%410%18%25%
649
16th to endDay
37%5%9%15%18%13%
523
September1st to 15thDay
21%7%10%20%20%20%
350
16th to endDay
23%411%21%25%14%
297
October1st to 15thDay
19%410%25%27%12%
270
16th to endDay
12%48%23%31%20%
200
November1st to 15thDay
6%9%32%33%18%
65
16th to endDay
15%15%24%28%15%
45
December1st to 15thDay
100%
1
January1st to 15thNight
21424%37%29%
968
16th to endNight
428%27%38%18%
992
February1st to 15thNight
46%6%22%32%27%
847
16th to endNight
145%17%38%32%
648
March1st to 15thNight
15%5%419%28%26%
720
16th to endNight
20%6%5%21%27%18%
693
April1st to 15thNight
7%4420%34%28%
539
16th to endNight
5%1421%37%30%
363
May1st to 15thNight
20%311%25%27%11%
258
16th to endNight
18%411%24%28%12%
125
July16th to endNight
22%27%17%28%23%
150
August1st to 15thNight
30%25%14%23%24%
326
16th to endNight
40%47%15%18%13%
427
September1st to 15thNight
25%310%23%26%11%
540
16th to endNight
28%210%21%25%13%
651
October1st to 15thNight
24%310%25%22%13%
738
16th to endNight
10%210%27%28%20%
816
November1st to 15thNight
13%5%6%24%31%17%
906
16th to endNight
15%6%7%20%24%24%
1048
December1st to 15thNight
6%7%9%24%30%21%
977
16th to endNight
5%6%6%16%31%33%
1056
Page generated at 2017-12-01 12:13:43. Version ac04

Copyright 2017 A. Danko


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