Inuvik
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Inuvik clear sky chart from 2005-11-05 to 2017-12-01.

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%
13638
4%
48266
4%
13623
43%
13623
9%
38862

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
42%
974
6%
4131
6%
974
43%
974
8%
3284
January16th to endNight
45%
1011
7%
3651
7%
1011
46%
1011
10%
2842
February1st to 15thNight
49%
765
7%
2914
8%
762
51%
762
11%
2200
February16th to endNight
43%
659
7%
2281
5%
659
47%
659
12%
1769
March1st to 15thNight
53%
730
10%
2257
10%
730
53%
730
14%
1719
March16th to endNight
58%
617
7%
2010
6%
617
59%
617
19%
1399
April1st to 15thNight
49%
539
0%
1514
0%
539
49%
539
16%
1153
April16th to endNight
57%
375
0%
1140
0%
375
57%
375
21%
806
May1st to 15thNight
47%
219
0%
724
0%
219
47%
219
15%
550
May16th to endNight
67%
79
0%
184
0%
79
67%
79
33%
121
June1st to 15thNight00000
June16th to endNight00000
July1st to 15thNight00000
July16th to endNight
47%
143
0%
315
0%
132
47%
132
16%
254
August1st to 15thNight
49%
240
0%
839
0%
239
49%
239
11%
650
August16th to endNight
47%
461
0%
1318
0%
461
47%
461
13%
1050
September1st to 15thNight
47%
540
0%
1614
0%
540
47%
540
13%
1274
September16th to endNight
24%
656
3%
1965
2%
656
25%
656
7%
1689
October1st to 15thNight
33%
728
5%
2320
3%
728
34%
728
9%
1946
October16th to endNight
29%
816
4%
2888
4%
816
30%
816
5%
2505
November1st to 15thNight
32%
986
3%
3326
2%
986
33%
986
7%
2865
November16th to endNight
38%
1049
4%
3934
4%
1049
38%
1049
6%
3387
December1st to 15thNight
43%
995
5%
4333
4%
995
45%
995
7%
3442
December16th to endNight
37%
1056
3%
4608
3%
1056
37%
1056
5%
3957

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
12%11%48%7%45%5%6%7%26%
50470
Night
8%14%6%11%9%5%7%5%5%6%18%
48292
TransparencyDay
55%8%16%15%3
49966
Night
65%6%12%12%2
48280
SeeingDay
16%214%26%28%11%
9491
Night
15%113%27%28%11%
13651

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 15thDay
5%8%11%28%211%11%8%225%
35
16th to endDay
310%6%9%10%6%11%8%7%8%17%
573
February1st to 15thDay
314%5%8%11%6%11%7%9%5%16%
951
16th to endDay
411%6%9%13%6%9%9%10%5%13%
1193
March1st to 15thDay
6%8%6%9%11%7%8%9%7%6%18%
1703
16th to endDay
5%12%6%9%9%46%9%7%6%22%
2206
April1st to 15thDay
10%16%6%10%7%46%5%45%21%
2432
16th to endDay
6%10%5%10%10%5%6%5%6%6%25%
2818
May1st to 15thDay
9%14%6%10%10%45%5%5%6%21%
3225
16th to endDay
9%7%35%5%3445%7%42%
4028
June1st to 15thDay
10%7%36%4245%6%8%37%
4320
16th to endDay
10%5%25%5%35%5%6%9%39%
4320
July1st to 15thDay
8%5%26%7%46%7%8%9%33%
4320
16th to endDay
18%10%48%6%46%6%6%7%20%
3831
August1st to 15thDay
19%10%37%6%45%5%5%7%22%
3116
16th to endDay
21%13%47%6%34445%24%
2882
September1st to 15thDay
20%13%46%434447%24%
2346
16th to endDay
23%19%5%9%5%2433318%
1994
October1st to 15thDay
16%18%7%9%5%3445%7%18%
1638
16th to endDay
12%22%8%11%10%45%34313%
1334
November1st to 15thDay
11%16%9%13%10%6%45%1315%
851
16th to endDay
7%14%6%19%9%5%7%7%7%5%9%
354
January1st to 15thNight
8%15%7%10%9%5%7%6%7%6%16%
4131
16th to endNight
5%11%7%11%9%5%8%8%7%9%15%
3651
February1st to 15thNight
311%5%11%9%6%9%8%7%8%19%
2911
16th to endNight
210%7%12%11%6%7%6%6%7%19%
2281
March1st to 15thNight
49%410%11%6%8%6%7%6%22%
2257
16th to endNight
48%5%9%10%5%6%6%6%5%32%
2010
April1st to 15thNight
9%14%5%9%6%35%7%5%7%25%
1514
16th to endNight
48%48%9%6%7%45%8%32%
1140
May1st to 15thNight
8%12%8%8%8%35%6%5%6%26%
723
16th to endNight
7%9%27%31435%12%41%
184
July16th to endNight
15%7%48%5%45%10%9%7%20%
341
August1st to 15thNight
17%9%28%9%5%5%46%8%22%
843
16th to endNight
19%10%47%6%445%7%7%22%
1318
September1st to 15thNight
17%14%37%5%45%45%8%23%
1614
16th to endNight
23%22%6%8%6%2313218%
1965
October1st to 15thNight
15%19%6%9%7%345%5%418%
2320
16th to endNight
15%19%8%12%9%4433413%
2888
November1st to 15thNight
9%17%9%14%10%5%5%33415%
3326
16th to endNight
6%13%8%16%13%6%8%5%5%5%11%
3934
December1st to 15thNight
7%13%7%10%10%5%8%6%6%6%16%
4333
16th to endNight
6%15%8%13%11%6%9%6%5%412%
4608

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
88%28%
35
16th to endDay
62%6%11%14%4
573
February1st to 15thDay
63%6%11%14%4
951
16th to endDay
63%7%13%9%4
1193
March1st to 15thDay
62%5%10%17%4
1703
16th to endDay
58%8%11%18%4
2206
April1st to 15thDay
64%5%13%11%4
2432
16th to endDay
57%7%16%15%3
2818
May1st to 15thDay
63%7%17%11%
3225
16th to endDay
40%6%17%25%9%
4033
June1st to 15thDay
43%8%17%24%5%
4320
16th to endDay
39%9%19%26%4
4320
July1st to 15thDay
43%12%22%18%2
4071
16th to endDay
59%11%20%8%
3592
August1st to 15thDay
60%9%20%8%1
3095
16th to endDay
62%9%16%11%
2882
September1st to 15thDay
58%10%21%8%
2346
16th to endDay
72%6%10%9%
1994
October1st to 15thDay
66%7%15%11%
1638
16th to endDay
75%7%10%6%
1334
November1st to 15thDay
74%6%7%9%1
851
16th to endDay
73%8%10%5%2
354
January1st to 15thNight
66%6%10%13%2
4131
16th to endNight
61%7%14%11%4
3651
February1st to 15thNight
59%7%12%16%4
2923
16th to endNight
62%5%11%13%5%
2281
March1st to 15thNight
59%410%20%3
2257
16th to endNight
50%5%15%24%4
2015
April1st to 15thNight
55%7%15%17%4
1514
16th to endNight
50%5%19%20%4
1140
May1st to 15thNight
58%5%16%18%
724
16th to endNight
38%417%30%8%
184
July16th to endNight
55%11%24%8%
315
August1st to 15thNight
59%8%20%9%1
839
16th to endNight
58%10%19%11%
1318
September1st to 15thNight
59%9%20%10%
1614
16th to endNight
74%49%9%1
1965
October1st to 15thNight
67%8%12%11%
2320
16th to endNight
75%6%11%5%1
2888
November1st to 15thNight
74%5%9%9%
3326
16th to endNight
73%7%8%7%3
3934
December1st to 15thNight
66%6%10%13%2
4333
16th to endNight
73%7%6%10%1
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
50%50%
4
16th to endDay
9%15%37%37%
32
February1st to 15thDay
14%6%6%29%29%14%
48
16th to endDay
12%18%23%28%16%
197
March1st to 15thDay
10%119%29%23%15%
240
16th to endDay
11%211%21%31%22%
280
April1st to 15thDay
15%215%28%26%11%
403
16th to endDay
8%14%31%29%14%
456
May1st to 15thDay
13%215%22%33%12%
648
16th to endDay
12%210%30%33%10%
939
June1st to 15thDay
13%418%27%25%9%
1035
16th to endDay
11%112%32%32%9%
1035
July1st to 15thDay
11%212%28%31%14%
985
16th to endDay
21%113%25%28%8%
865
August1st to 15thDay
22%211%26%27%9%
608
16th to endDay
28%214%22%21%10%
523
September1st to 15thDay
31%414%18%20%11%
387
16th to endDay
33%318%17%18%7%
303
October1st to 15thDay
22%319%23%24%5%
270
16th to endDay
23%110%21%29%12%
134
November1st to 15thDay
13%119%24%20%20%
73
16th to endDay
11%19%26%30%11%
26
January1st to 15thNight
15%316%29%25%10%
979
16th to endNight
10%116%34%27%9%
1011
February1st to 15thNight
9%214%30%30%13%
770
16th to endNight
7%218%27%24%18%
659
March1st to 15thNight
9%112%33%31%12%
730
16th to endNight
8%8%24%41%16%
618
April1st to 15thNight
15%110%26%31%13%
539
16th to endNight
6%114%38%29%10%
375
May1st to 15thNight
16%11%28%33%9%
220
16th to endNight
10%26%33%41%6%
80
July16th to endNight
20%13%35%27%2
143
August1st to 15thNight
21%212%34%25%5%
240
16th to endNight
24%111%23%29%8%
461
September1st to 15thNight
26%210%25%28%6%
540
16th to endNight
36%217%20%17%5%
656
October1st to 15thNight
26%117%24%23%7%
728
16th to endNight
26%110%18%28%13%
816
November1st to 15thNight
16%116%24%29%11%
986
16th to endNight
11%310%25%31%18%
1049
December1st to 15thNight
11%114%30%29%12%
995
16th to endNight
11%213%32%29%11%
1056
Page generated at 2017-12-02 07:14:26. Version ac04

Copyright 2017 A. Danko


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