Goose Bay
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goose Bay clear sky chart from 2005-11-05 to 2017-09-21.

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
24%
14462
9%
46725
5%
14423
29%
14423
11%
35544

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
19%
750
10%
2792
4%
746
27%
746
9%
2118
January16th to endNight
27%
800
14%
2817
8%
800
36%
800
11%
2031
February1st to 15thNight
28%
725
14%
2411
9%
722
35%
722
14%
1694
February16th to endNight
26%
631
10%
2020
5%
631
31%
631
12%
1552
March1st to 15thNight
25%
720
11%
2129
6%
717
31%
717
13%
1672
March16th to endNight
21%
669
10%
2013
6%
669
26%
669
11%
1601
April1st to 15thNight
22%
539
9%
1796
8%
539
26%
539
8%
1434
April16th to endNight
21%
540
11%
1473
5%
540
27%
540
12%
1129
May1st to 15thNight
25%
540
6%
1440
2%
540
28%
540
13%
1105
May16th to endNight
25%
446
1%
1237
0%
446
27%
446
11%
976
June1st to 15thNight
28%
360
0%
1080
0%
360
28%
360
11%
856
June16th to endNight
31%
360
0%
1080
0%
360
31%
360
14%
826
July1st to 15thNight
30%
340
0%
1020
0%
340
30%
340
12%
810
July16th to endNight
33%
415
1%
1261
1%
390
36%
390
11%
972
August1st to 15thNight
34%
539
5%
1429
3%
535
36%
535
15%
1112
August16th to endNight
33%
573
8%
1690
4%
573
37%
573
15%
1259
September1st to 15thNight
23%
540
10%
1800
6%
540
30%
540
12%
1314
September16th to endNight
19%
549
9%
1858
4%
549
26%
549
10%
1416
October1st to 15thNight
25%
660
10%
1980
4%
660
30%
660
12%
1545
October16th to endNight
21%
736
9%
2309
4%
736
25%
736
9%
1875
November1st to 15thNight
18%
730
9%
2455
2%
730
24%
730
9%
1924
November16th to endNight
18%
750
11%
2700
5%
750
27%
750
9%
2043
December1st to 15thNight
19%
750
9%
2863
5%
750
26%
750
10%
2071
December16th to endNight
22%
800
12%
3072
7%
800
29%
800
10%
2209

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
21%11%47%6%34445%26%
48158
Night
19%12%47%5%34445%27%
46878
TransparencyDay
59%7%11%15%5%
47817
Night
59%6%11%16%6%
46737
SeeingDay
27%18%21%19%10%2
7389
Night
23%21%22%22%9%
14463

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 15thDay
15%19%5%7%434445%23%
1143
16th to endDay
10%12%6%8%5%445%5%5%29%
1407
February1st to 15thDay
10%12%5%7%6%35%5%47%31%
1449
16th to endDay
12%13%7%7%7%35%45%8%23%
1452
March1st to 15thDay
13%17%6%7%5%24345%27%
1808
16th to endDay
15%16%5%8%7%44345%26%
2211
April1st to 15thDay
21%17%5%7%5%2444422%
2153
16th to endDay
20%14%5%7%5%23335%27%
2487
May1st to 15thDay
24%13%36%5%34446%24%
2512
16th to endDay
28%12%46%5%2344422%
2885
June1st to 15thDay
28%9%47%6%24435%23%
2880
16th to endDay
22%7%36%6%35%5%5%7%25%
2880
July1st to 15thDay
27%8%37%5%35%5%6%6%20%
2880
16th to endDay
24%7%37%7%45%5%5%6%22%
2807
August1st to 15thDay
24%7%36%6%35%5%5%8%24%
2520
16th to endDay
22%7%26%6%35%6%46%27%
2510
September1st to 15thDay
20%9%35%6%3445%6%31%
2160
16th to endDay
20%8%36%5%4445%5%31%
1893
October1st to 15thDay
24%11%46%5%2444427%
1650
16th to endDay
30%12%26%5%2443423%
1562
November1st to 15thDay
20%15%45%5%23435%27%
1402
16th to endDay
21%10%37%423436%31%
1260
December1st to 15thDay
10%13%46%426%435%36%
1095
16th to endDay
17%13%47%5%3334432%
1152
January1st to 15thNight
18%17%5%7%6%24325%26%
2792
16th to endNight
10%14%6%8%6%35%45%5%29%
2817
February1st to 15thNight
11%12%49%5%3445%6%32%
2411
16th to endNight
14%17%6%9%6%24445%25%
2020
March1st to 15thNight
14%16%6%7%6%3445%425%
2126
16th to endNight
16%18%6%9%6%3324424%
2013
April1st to 15thNight
25%14%5%7%6%2432324%
1796
16th to endNight
21%12%46%5%25%445%28%
1473
May1st to 15thNight
24%9%345%2444431%
1440
16th to endNight
30%9%45%5%22445%26%
1236
June1st to 15thNight
29%10%25%5%35%435%25%
1080
16th to endNight
22%6%27%6%36%35%6%29%
1080
July1st to 15thNight
23%7%38%7%36%46%6%21%
1080
16th to endNight
21%7%37%7%46%45%6%25%
1347
August1st to 15thNight
20%7%46%6%445%46%28%
1440
16th to endNight
20%6%35%5%36%5%5%8%28%
1690
September1st to 15thNight
22%7%35%6%3345%7%29%
1800
16th to endNight
25%7%36%6%35%336%27%
1858
October1st to 15thNight
24%9%35%5%3446%5%26%
1980
16th to endNight
31%12%36%42333424%
2309
November1st to 15thNight
20%14%47%5%34335%26%
2455
16th to endNight
18%15%46%424445%28%
2700
December1st to 15thNight
13%12%5%8%6%24446%31%
2863
16th to endNight
15%14%5%6%5%34435%31%
3072

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
63%5%8%15%6%
1144
16th to endDay
54%6%10%15%12%
1407
February1st to 15thDay
51%6%14%18%8%
1452
16th to endDay
59%5%11%17%5%
1452
March1st to 15thDay
59%5%10%16%8%
1818
16th to endDay
62%47%15%9%
2211
April1st to 15thDay
66%5%8%12%7%
2153
16th to endDay
61%5%10%16%5%
2487
May1st to 15thDay
60%6%12%12%6%
2512
16th to endDay
64%6%9%14%5%
2889
June1st to 15thDay
64%6%10%14%3
2880
16th to endDay
57%8%12%16%4
2880
July1st to 15thDay
62%9%13%12%2
2711
16th to endDay
59%9%12%14%3
2631
August1st to 15thDay
56%10%15%13%2
2506
16th to endDay
55%9%15%15%3
2510
September1st to 15thDay
54%7%14%20%3
2160
16th to endDay
55%8%12%17%7%
1893
October1st to 15thDay
61%6%11%14%6%
1650
16th to endDay
67%6%10%12%4
1562
November1st to 15thDay
60%6%12%14%4
1402
16th to endDay
57%6%13%19%2
1260
December1st to 15thDay
51%7%14%21%4
1095
16th to endDay
55%6%11%16%9%
1152
January1st to 15thNight
62%411%15%6%
2792
16th to endNight
56%5%11%17%9%
2817
February1st to 15thNight
52%412%21%7%
2412
16th to endNight
60%410%17%6%
2020
March1st to 15thNight
61%49%14%8%
2139
16th to endNight
66%37%13%8%1
2013
April1st to 15thNight
66%36%13%8%
1796
16th to endNight
56%6%9%17%8%
1473
May1st to 15thNight
58%5%13%15%6%
1440
16th to endNight
61%5%10%16%6%
1238
June1st to 15thNight
61%6%11%14%4
1080
16th to endNight
54%8%14%15%7%
1080
July1st to 15thNight
57%11%14%14%2
1020
16th to endNight
57%8%13%15%4
1261
August1st to 15thNight
54%10%17%14%3
1429
16th to endNight
52%8%17%15%5%
1690
September1st to 15thNight
54%6%14%17%6%
1800
16th to endNight
58%7%12%15%5%
1858
October1st to 15thNight
58%7%10%15%6%
1980
16th to endNight
66%5%10%14%3
2309
November1st to 15thNight
62%6%11%14%4
2455
16th to endNight
59%7%12%18%2
2700
December1st to 15thNight
55%7%14%18%4
2863
16th to endNight
57%411%19%6%
3072

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
21%13%38%16%10%
60
16th to endDay
17%14%28%27%11%
127
February1st to 15thDay
12%20%22%27%13%3
236
16th to endDay
17%21%26%16%12%5%
212
March1st to 15thDay
21%22%21%20%11%3
244
16th to endDay
19%21%28%21%6%3
288
April1st to 15thDay
28%22%22%12%10%4
270
16th to endDay
29%22%21%14%9%1
423
May1st to 15thDay
31%17%18%16%11%4
468
16th to endDay
33%18%19%17%8%2
519
June1st to 15thDay
37%16%14%18%11%1
495
16th to endDay
24%20%19%21%10%3
495
July1st to 15thDay
28%15%22%20%11%2
475
16th to endDay
27%16%14%24%14%3
514
August1st to 15thDay
27%11%18%22%16%3
493
16th to endDay
26%12%19%21%17%3
422
September1st to 15thDay
28%12%30%19%7%
315
16th to endDay
24%23%29%16%5%
254
October1st to 15thDay
27%22%22%16%7%4
225
16th to endDay
35%15%21%14%8%4
240
November1st to 15thDay
25%21%23%19%7%1
235
16th to endDay
30%18%22%23%5%
240
December1st to 15thDay
17%12%30%25%12%2
75
16th to endDay
17%21%31%17%10%1
64
January1st to 15thNight
25%23%24%19%6%
750
16th to endNight
12%25%23%28%9%
800
February1st to 15thNight
15%21%25%24%11%2
725
16th to endNight
20%20%21%22%11%3
631
March1st to 15thNight
16%25%24%22%9%1
720
16th to endNight
23%22%22%23%7%1
669
April1st to 15thNight
27%24%15%23%7%1
539
16th to endNight
25%25%20%19%7%
540
May1st to 15thNight
26%20%19%22%9%1
540
16th to endNight
32%21%16%21%6%2
447
June1st to 15thNight
32%19%15%24%8%
360
16th to endNight
18%21%20%23%15%
360
July1st to 15thNight
23%16%20%26%12%1
340
16th to endNight
22%20%13%31%12%
415
August1st to 15thNight
19%13%22%28%14%
539
16th to endNight
21%15%22%26%12%
573
September1st to 15thNight
29%16%25%22%6%
540
16th to endNight
28%18%27%20%4
549
October1st to 15thNight
28%19%21%20%9%
660
16th to endNight
35%16%21%17%7%
736
November1st to 15thNight
26%23%25%17%6%1
730
16th to endNight
25%23%27%18%4
750
December1st to 15thNight
16%27%29%16%9%
750
16th to endNight
21%23%21%21%10%1
800
Page generated at 2017-09-22 08:35:39. Version ac04

Copyright 2017 A. Danko


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