Labrador City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Labrador City clear sky chart from 2005-11-06 to 2024-01-13.

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
27%
22668
7%
74920
4%
22614
30%
22614
10%
60824

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
31%
850
11%
2838
8%
847
36%
847
10%
2279
January11th to 20thNight
27%
814
9%
2742
6%
814
31%
814
10%
2156
January21st to endNight
32%
851
14%
2906
10%
851
39%
851
11%
2238
February1st to 10thNight
37%
720
11%
2502
8%
720
43%
720
13%
1858
February11th to 20thNight
28%
702
9%
2276
5%
699
35%
699
12%
1781
February21st to endNight
34%
592
12%
1910
8%
592
39%
592
13%
1440
March1st to 10thNight
34%
719
11%
2132
8%
719
38%
719
14%
1650
March11th to 20thNight
28%
720
11%
1980
6%
720
33%
720
14%
1573
March21st to endNight
25%
792
11%
2178
5%
792
29%
792
13%
1774
April1st to 10thNight
25%
590
8%
1693
5%
590
28%
590
10%
1413
April11th to 20thNight
30%
534
12%
1598
9%
534
35%
534
17%
1191
April21st to endNight
30%
540
9%
1620
8%
540
33%
540
13%
1273
May1st to 10thNight
27%
477
6%
1377
5%
477
29%
477
10%
1147
May11th to 20thNight
32%
354
6%
1238
3%
354
36%
354
14%
928
May21st to endNight
28%
388
1%
1356
0%
388
28%
388
11%
1054
June1st to 10thNight
35%
360
0%
1260
0%
360
35%
360
13%
938
June11th to 20thNight
34%
360
0%
1260
0%
360
34%
360
11%
956
June21st to endNight
36%
360
0%
1260
0%
360
36%
360
12%
973
July1st to 10thNight
36%
350
0%
1225
0%
350
36%
350
13%
931
July11th to 20thNight
37%
348
0%
1218
0%
348
37%
348
13%
927
July21st to endNight
40%
394
2%
1300
1%
372
42%
372
10%
1045
August1st to 10thNight
45%
358
5%
1303
8%
356
45%
356
10%
1033
August11th to 20thNight
37%
523
4%
1587
3%
523
39%
523
11%
1284
August21st to endNight
34%
594
7%
1782
4%
594
36%
594
13%
1387
September1st to 10thNight
29%
540
9%
1697
5%
540
32%
540
13%
1322
September11th to 20thNight
26%
696
7%
1956
4%
696
29%
696
12%
1580
September21st to endNight
22%
720
7%
1980
3%
720
25%
720
12%
1604
October1st to 10thNight
19%
720
8%
2146
4%
720
23%
720
11%
1705
October11th to 20thNight
23%
720
7%
2236
5%
720
25%
720
8%
1908
October21st to endNight
20%
823
6%
2636
4%
823
21%
823
7%
2277
November1st to 10thNight
13%
830
3%
2593
2%
830
14%
830
4%
2347
November11th to 20thNight
12%
850
3%
2719
2%
850
13%
850
4%
2473
November21st to endNight
20%
850
2%
2850
1%
850
21%
850
5%
2539
December1st to 10thNight
20%
850
4%
2850
2%
850
22%
850
5%
2516
December11th to 20thNight
22%
850
4%
3518
3%
849
24%
849
6%
2969
December21st to endNight
27%
929
6%
5198
5%
906
32%
906
4%
4355

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
18%14%6%11%8%5%6%5%5%6%17%
74642
Night
15%14%6%11%9%5%6%5%5%7%17%
75121
TransparencyDay
67%8%10%11%5%
74324
Night
65%8%10%12%5%1
74974
SeeingDay
23%11%26%23%13%4
14979
Night
21%10%30%27%11%2
22677

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
10%14%7%14%10%47%5%6%10%13%
1327
11th to 20thDay
7%11%8%13%11%445%5%13%19%
1280
21st to endDay
5%11%7%12%12%5%7%6%8%12%16%
1449
February1st to 10thDay
311%6%10%8%5%6%8%12%12%19%
1458
11th to 20thDay
414%8%13%10%5%8%6%7%11%15%
1573
21st to endDay
6%13%7%9%8%5%9%6%8%10%19%
1345
March1st to 10thDay
412%8%17%13%5%5%8%7%7%14%
1823
11th to 20thDay
9%14%8%12%9%5%8%6%5%7%17%
1980
21st to endDay
7%17%8%12%10%5%7%7%6%6%16%
2178
April1st to 10thDay
16%17%8%13%9%5%7%5%4413%
2266
11th to 20thDay
11%15%412%9%5%6%45%5%25%
2312
21st to endDay
18%15%6%12%8%45%45%5%18%
2340
May1st to 10thDay
23%19%7%9%6%35%33417%
2600
11th to 20thDay
16%14%7%11%8%5%5%446%19%
2655
21st to endDay
21%16%7%10%7%345%45%18%
2919
June1st to 10thDay
25%14%5%8%5%24446%23%
2700
11th to 20thDay
24%10%5%8%6%35%5%5%6%22%
2700
21st to endDay
26%9%38%7%5%6%5%46%20%
2700
July1st to 10thDay
23%11%5%8%7%46%45%5%20%
2700
11th to 20thDay
26%9%49%7%46%5%6%6%18%
2700
21st to endDay
23%11%5%9%10%5%7%5%6%5%14%
2941
August1st to 10thDay
25%11%5%10%7%5%6%5%6%6%15%
2615
11th to 20thDay
27%10%49%7%5%6%5%5%5%18%
2304
21st to endDay
26%11%49%7%45%5%5%6%18%
2574
September1st to 10thDay
24%11%48%8%46%45%6%21%
2262
11th to 20thDay
24%14%410%9%44445%17%
2002
21st to endDay
21%18%6%10%6%44446%17%
1980
October1st to 10thDay
22%17%6%9%7%45%35%5%16%
1814
11th to 20thDay
26%19%6%9%7%3433414%
1722
21st to endDay
22%20%10%11%8%4433411%
1720
November1st to 10thDay
21%18%6%15%12%35%4447%
1485
11th to 20thDay
15%19%8%16%11%6%6%4438%
1459
21st to endDay
14%16%7%15%12%5%8%6%5%5%8%
1330
December1st to 10thDay
9%14%7%15%13%7%6%7%6%6%11%
1330
11th to 20thDay
10%16%6%11%11%7%9%7%7%7%10%
1668
21st to endDay
7%14%7%13%11%9%9%5%6%6%14%
2431
January1st to 10thNight
8%14%6%12%10%5%7%7%7%10%12%
2838
11th to 20thNight
8%14%6%14%10%47%6%7%12%14%
2742
21st to endNight
5%11%7%14%10%5%7%7%7%11%15%
2906
February1st to 10thNight
49%8%9%11%6%8%8%8%11%19%
2502
11th to 20thNight
6%14%8%13%9%5%7%5%7%11%15%
2273
21st to endNight
7%11%5%10%10%5%7%7%9%10%19%
1910
March1st to 10thNight
5%13%6%12%9%6%7%7%7%8%20%
2123
11th to 20thNight
8%17%7%10%8%5%6%6%6%7%21%
1979
21st to endNight
8%18%8%12%9%46%5%5%5%22%
2178
April1st to 10thNight
14%17%8%12%8%46%44418%
1693
11th to 20thNight
14%14%5%8%7%35%5%45%30%
1598
21st to endNight
17%13%5%10%8%5%45%45%25%
1620
May1st to 10thNight
23%16%6%9%7%3445%419%
1377
11th to 20thNight
19%13%5%7%6%3446%6%27%
1238
21st to endNight
21%12%6%8%6%4445%6%22%
1356
June1st to 10thNight
20%12%47%6%36%447%27%
1260
11th to 20thNight
22%10%5%7%7%45%5%5%6%25%
1260
21st to endNight
23%9%38%7%35%5%5%6%24%
1260
July1st to 10thNight
21%11%48%6%36%5%6%7%25%
1260
11th to 20thNight
23%8%47%5%5%5%45%7%27%
1260
21st to endNight
19%10%5%8%8%45%7%7%7%20%
1377
August1st to 10thNight
22%9%47%7%46%46%7%23%
1312
11th to 20thNight
22%9%48%8%46%5%6%6%22%
1587
21st to endNight
24%9%46%6%45%6%6%8%23%
1782
September1st to 10thNight
21%10%38%7%45%5%46%27%
1697
11th to 20thNight
23%12%48%6%36%5%6%6%22%
1956
21st to endNight
22%12%5%8%7%46%5%5%6%21%
1980
October1st to 10thNight
21%16%47%6%35%5%5%6%22%
2146
11th to 20thNight
25%19%6%9%6%43346%15%
2236
21st to endNight
24%16%7%10%8%35%5%5%414%
2636
November1st to 10thNight
19%19%7%14%12%46%4339%
2593
11th to 20thNight
18%18%8%13%11%7%5%4448%
2719
21st to endNight
16%16%8%12%10%5%8%6%5%6%8%
2850
December1st to 10thNight
9%16%7%13%11%7%8%7%6%6%10%
2850
11th to 20thNight
14%15%6%12%11%7%7%5%5%8%11%
3531
21st to endNight
7%14%9%13%11%10%9%6%5%6%11%
5236

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
66%6%7%15%5%
1328
11th to 20thDay
59%6%9%16%9%1
1280
21st to endDay
59%7%8%14%10%1
1449
February1st to 10thDay
52%7%10%22%9%
1458
11th to 20thDay
62%6%9%13%9%
1581
21st to endDay
56%6%10%16%11%2
1345
March1st to 10thDay
66%6%10%9%7%2
1827
11th to 20thDay
66%5%7%14%7%2
1980
21st to endDay
67%7%8%10%7%1
2178
April1st to 10thDay
74%7%8%7%4
2266
11th to 20thDay
60%6%8%13%11%1
2312
21st to endDay
67%7%10%9%7%
2340
May1st to 10thDay
72%5%8%10%6%
2600
11th to 20thDay
65%7%10%12%5%
2659
21st to endDay
68%7%10%12%4
2919
June1st to 10thDay
63%6%11%13%7%1
2700
11th to 20thDay
61%8%11%15%6%
2700
21st to endDay
63%9%12%11%4
2700
July1st to 10thDay
64%9%11%12%4
2625
11th to 20thDay
65%8%13%13%2
2619
21st to endDay
69%11%11%8%1
2777
August1st to 10thDay
69%10%11%10%1
2600
11th to 20thDay
65%10%12%11%2
2304
21st to endDay
65%9%12%12%2
2574
September1st to 10thDay
63%8%13%13%3
2262
11th to 20thDay
69%8%11%10%2
2002
21st to endDay
68%8%10%12%2
1980
October1st to 10thDay
70%8%10%10%2
1814
11th to 20thDay
75%6%7%9%2
1722
21st to endDay
77%6%6%7%21
1720
November1st to 10thDay
80%7%7%41
1485
11th to 20thDay
80%7%8%311
1459
21st to endDay
77%9%6%6%2
1330
December1st to 10thDay
70%11%8%7%21
1330
11th to 20thDay
68%11%10%8%4
1668
21st to endDay
68%7%7%11%5%1
2431
January1st to 10thNight
64%8%8%13%6%1
2838
11th to 20thNight
63%7%9%13%8%1
2742
21st to endNight
61%6%8%14%8%2
2906
February1st to 10thNight
56%8%9%17%10%
2502
11th to 20thNight
63%6%8%14%9%
2276
21st to endNight
57%8%10%15%9%2
1910
March1st to 10thNight
59%6%11%16%6%2
2132
11th to 20thNight
62%6%7%14%10%1
1980
21st to endNight
65%6%8%12%9%1
2178
April1st to 10thNight
70%5%8%9%8%1
1693
11th to 20thNight
56%6%9%15%13%2
1598
21st to endNight
62%6%10%16%7%
1620
May1st to 10thNight
69%5%8%13%4
1377
11th to 20thNight
56%7%11%17%8%
1239
21st to endNight
62%7%10%15%7%
1357
June1st to 10thNight
57%7%12%16%8%
1260
11th to 20thNight
58%9%12%18%4
1260
21st to endNight
59%9%11%16%5%
1260
July1st to 10thNight
56%10%15%15%4
1225
11th to 20thNight
56%10%14%17%3
1218
21st to endNight
57%15%13%14%1
1300
August1st to 10thNight
59%12%14%14%1
1303
11th to 20thNight
59%13%14%11%2
1587
21st to endNight
57%10%17%14%2
1782
September1st to 10thNight
59%8%13%18%3
1697
11th to 20thNight
60%10%14%13%2
1956
21st to endNight
62%8%14%13%2
1980
October1st to 10thNight
60%9%13%13%5%
2146
11th to 20thNight
71%7%10%9%2
2236
21st to endNight
71%9%8%7%41
2636
November1st to 10thNight
80%6%7%6%1
2593
11th to 20thNight
80%7%6%6%1
2719
21st to endNight
75%9%9%6%2
2850
December1st to 10thNight
73%10%8%6%2
2850
11th to 20thNight
71%7%10%8%5%
3532
21st to endNight
71%8%7%6%6%2
5236

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
7%8%31%28%20%6%
180
11th to 20thDay
8%11%31%32%14%3
166
21st to endDay
12%5%38%30%12%5%
176
February1st to 10thDay
8%8%41%22%15%5%
178
11th to 20thDay
6%10%38%29%13%3
336
21st to endDay
10%9%33%28%16%3
286
March1st to 10thDay
11%12%31%25%17%4
420
11th to 20thDay
13%13%29%26%14%5%
420
21st to endDay
14%16%33%24%10%3
462
April1st to 10thDay
22%14%33%21%8%3
420
11th to 20thDay
15%13%26%29%11%6%
412
21st to endDay
22%13%26%21%13%5%
420
May1st to 10thDay
32%8%22%24%10%5%
603
11th to 20thDay
19%12%26%20%17%7%
624
21st to endDay
26%12%24%22%13%3
680
June1st to 10thDay
28%8%22%26%14%2
630
11th to 20thDay
29%8%22%23%14%4
630
21st to endDay
28%8%24%20%15%4
630
July1st to 10thDay
24%9%25%20%15%6%
620
11th to 20thDay
29%9%21%25%13%3
618
21st to endDay
26%6%19%27%17%6%
685
August1st to 10thDay
30%8%19%23%14%5%
564
11th to 20thDay
23%9%18%22%22%6%
439
21st to endDay
27%9%21%22%15%4
495
September1st to 10thDay
29%14%28%19%8%2
450
11th to 20thDay
27%14%30%19%8%2
450
21st to endDay
26%18%33%13%8%3
450
October1st to 10thDay
25%19%30%17%6%3
367
11th to 20thDay
35%11%23%21%7%3
360
21st to endDay
31%13%23%20%11%3
396
November1st to 10thDay
28%15%33%19%41
365
11th to 20thDay
23%13%31%23%8%2
309
21st to endDay
12%16%39%20%10%3
180
December1st to 10thDay
15%11%21%29%20%4
180
11th to 20thDay
16%13%37%22%9%3
180
21st to endDay
14%13%33%23%15%3
198
January1st to 10thNight
12%8%31%30%15%3
850
11th to 20thNight
12%10%36%31%9%2
814
21st to endNight
11%6%35%34%13%2
851
February1st to 10thNight
7%9%32%34%14%4
720
11th to 20thNight
12%10%36%28%12%3
703
21st to endNight
11%7%33%29%15%4
592
March1st to 10thNight
10%8%33%31%16%3
720
11th to 20thNight
13%10%36%27%13%1
720
21st to endNight
15%13%33%27%9%2
792
April1st to 10thNight
21%9%33%29%6%1
590
11th to 20thNight
20%7%31%27%10%4
534
21st to endNight
24%9%27%29%9%2
540
May1st to 10thNight
28%8%25%28%10%1
477
11th to 20thNight
23%8%26%26%14%3
354
21st to endNight
26%11%25%27%10%1
389
June1st to 10thNight
23%7%26%34%10%
360
11th to 20thNight
25%9%23%29%13%
360
21st to endNight
27%5%23%29%16%1
360
July1st to 10thNight
25%6%22%30%15%1
350
11th to 20thNight
23%7%24%34%11%
348
21st to endNight
20%6%20%33%19%2
394
August1st to 10thNight
27%5%15%33%18%1
358
11th to 20thNight
23%7%22%30%17%2
523
21st to endNight
26%7%26%29%11%1
594
September1st to 10thNight
26%10%29%28%7%1
540
11th to 20thNight
28%12%28%25%6%1
696
21st to endNight
26%15%33%20%6%
720
October1st to 10thNight
32%14%29%20%5%
720
11th to 20thNight
35%8%23%24%8%2
720
21st to endNight
32%11%27%20%9%2
823
November1st to 10thNight
29%15%29%19%6%1
830
11th to 20thNight
25%15%30%20%9%1
850
21st to endNight
23%10%32%24%10%1
850
December1st to 10thNight
17%9%35%26%10%3
850
11th to 20thNight
16%10%35%28%10%1
850
21st to endNight
16%12%27%28%14%2
935
Page generated at 2024-01-10 20:35:26. Version ac07

Copyright 2024 Attilla Danko


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