L'Anse-au-Loup
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the L'Anse-au-Loup 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
18%
15123
10%
47460
3%
15082
26%
15082
11%
35684

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
11%
747
12%
2656
2%
746
23%
746
9%
1946
January16th to endNight
16%
800
19%
2688
4%
800
33%
800
11%
1872
February1st to 15thNight
17%
734
13%
2461
4%
731
28%
731
12%
1743
February16th to endNight
18%
632
10%
1924
2%
632
24%
632
12%
1427
March1st to 15thNight
19%
720
15%
2160
5%
720
29%
720
12%
1589
March16th to endNight
15%
596
12%
2015
5%
596
24%
596
9%
1535
April1st to 15thNight
18%
539
10%
1763
6%
539
24%
539
7%
1413
April16th to endNight
19%
540
12%
1576
6%
540
25%
540
11%
1180
May1st to 15thNight
22%
540
6%
1431
2%
540
24%
540
11%
1157
May16th to endNight
21%
560
3%
1308
1%
560
23%
560
12%
1085
June1st to 15thNight
18%
512
0%
1232
0%
512
18%
512
9%
1050
June16th to endNight
25%
360
0%
1080
0%
360
25%
360
9%
895
July1st to 15thNight
24%
423
0%
1103
0%
423
24%
423
11%
910
July16th to endNight
21%
565
3%
1353
2%
532
23%
532
11%
1135
August1st to 15thNight
27%
539
5%
1429
2%
535
28%
535
12%
1150
August16th to endNight
25%
573
8%
1714
4%
573
28%
573
12%
1325
September1st to 15thNight
20%
540
9%
1818
4%
540
28%
540
12%
1348
September16th to endNight
17%
538
10%
1980
4%
538
26%
538
12%
1395
October1st to 15thNight
23%
670
12%
2156
5%
670
29%
670
14%
1548
October16th to endNight
19%
816
12%
2496
4%
816
26%
816
11%
1913
November1st to 15thNight
16%
805
13%
2616
3%
805
24%
805
11%
1898
November16th to endNight
15%
824
13%
2921
4%
824
26%
824
9%
2164
December1st to 15thNight
12%
750
11%
2700
3%
750
23%
750
10%
1976
December16th to endNight
17%
800
14%
2880
6%
800
27%
800
10%
2030

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
23%12%47%5%24345%25%
48958
Night
21%12%47%5%24445%27%
47617
TransparencyDay
59%6%12%15%6%
48632
Night
58%5%11%16%7%
47461
SeeingDay
28%20%23%17%7%2
8368
Night
26%24%24%18%6%
15127

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%13%5%7%5%23347%31%
1280
16th to endDay
13%16%5%7%6%3434330%
1536
February1st to 15thDay
10%14%5%8%424345%36%
1400
16th to endDay
11%16%5%7%6%35%445%30%
1548
March1st to 15thDay
18%15%5%8%5%3433427%
1790
16th to endDay
16%16%6%7%6%34346%24%
2205
April1st to 15thDay
20%17%6%8%7%3333420%
2185
16th to endDay
19%14%5%7%6%3435%5%24%
2382
May1st to 15thDay
22%12%47%6%45%445%21%
2521
16th to endDay
28%11%48%5%23345%21%
2805
June1st to 15thDay
28%11%5%7%5%35%45%6%16%
2736
16th to endDay
26%12%46%5%2335%6%21%
2880
July1st to 15thDay
27%10%47%6%2435%6%21%
2775
16th to endDay
25%11%37%6%35%45%6%21%
2719
August1st to 15thDay
28%9%25%5%3445%7%24%
2520
16th to endDay
26%11%36%414347%25%
2485
September1st to 15thDay
31%7%35%5%23445%27%
2142
16th to endDay
26%10%35%5%34345%26%
1980
October1st to 15thDay
26%9%25%42334432%
1803
16th to endDay
27%13%36%5%24345%24%
1728
November1st to 15thDay
21%10%46%5%3333432%
1569
16th to endDay
23%14%5%5%41223431%
1365
December1st to 15thDay
15%15%5%6%315%45%430%
1260
16th to endDay
20%12%49%323235%34%
1344
January1st to 15thNight
14%14%5%7%7%34445%29%
2656
16th to endNight
13%17%5%5%42333435%
2688
February1st to 15thNight
9%14%6%9%6%24445%31%
2460
16th to endNight
13%14%48%6%25%345%29%
1924
March1st to 15thNight
15%15%5%6%5%34445%30%
2147
16th to endNight
15%16%6%7%5%25%44424%
2015
April1st to 15thNight
22%17%6%8%5%2433420%
1763
16th to endNight
21%12%47%422435%30%
1576
May1st to 15thNight
23%11%47%6%34445%23%
1431
16th to endNight
28%10%45%5%24436%21%
1307
June1st to 15thNight
29%11%6%7%6%24435%18%
1232
16th to endNight
29%10%5%6%5%26%6%35%17%
1080
July1st to 15thNight
27%10%410%5%43436%18%
1170
16th to endNight
28%11%6%8%5%3445%5%16%
1447
August1st to 15thNight
28%11%47%5%24345%22%
1440
16th to endNight
22%10%47%6%3435%7%23%
1714
September1st to 15thNight
29%7%25%5%33446%27%
1818
16th to endNight
23%10%36%5%23346%30%
1980
October1st to 15thNight
20%9%36%6%34445%31%
2156
16th to endNight
28%11%36%5%2334426%
2496
November1st to 15thNight
26%10%35%423345%30%
2616
16th to endNight
25%13%46%42334427%
2921
December1st to 15thNight
16%16%5%7%334335%31%
2700
16th to endNight
18%13%45%424235%33%
2880

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
53%5%14%17%7%
1281
16th to endDay
57%29%16%12%
1536
February1st to 15thDay
49%5%10%21%9%2
1403
16th to endDay
55%46%20%11%
1548
March1st to 15thDay
60%49%15%9%
1800
16th to endDay
61%47%15%8%1
2205
April1st to 15thDay
65%5%7%11%8%1
2185
16th to endDay
58%6%9%14%10%
2382
May1st to 15thDay
62%6%11%12%6%
2521
16th to endDay
63%6%13%11%4
2809
June1st to 15thDay
66%7%12%11%2
2736
16th to endDay
61%5%12%16%3
2880
July1st to 15thDay
60%7%14%15%2
2614
16th to endDay
60%8%15%13%2
2550
August1st to 15thDay
55%8%17%13%4
2506
16th to endDay
57%6%16%16%3
2485
September1st to 15thDay
57%6%11%17%7%
2142
16th to endDay
56%7%12%14%8%
1980
October1st to 15thDay
55%5%12%17%8%
1803
16th to endDay
61%6%11%14%5%
1728
November1st to 15thDay
54%314%17%8%1
1569
16th to endDay
56%410%18%9%
1365
December1st to 15thDay
55%5%12%17%9%
1260
16th to endDay
55%39%18%11%1
1344
January1st to 15thNight
57%412%16%6%1
2656
16th to endNight
53%38%18%14%1
2688
February1st to 15thNight
54%311%18%9%2
2461
16th to endNight
56%413%18%6%
1924
March1st to 15thNight
56%39%17%11%
2160
16th to endNight
62%39%13%9%1
2015
April1st to 15thNight
68%37%11%7%1
1763
16th to endNight
57%411%16%9%1
1576
May1st to 15thNight
62%6%11%13%5%
1431
16th to endNight
63%5%11%14%4
1309
June1st to 15thNight
67%7%11%9%3
1232
16th to endNight
66%7%11%11%2
1080
July1st to 15thNight
65%5%14%10%2
1103
16th to endNight
66%6%12%12%1
1353
August1st to 15thNight
61%7%15%12%3
1429
16th to endNight
57%8%14%15%3
1714
September1st to 15thNight
55%7%13%18%4
1818
16th to endNight
54%5%15%16%7%
1980
October1st to 15thNight
54%5%14%17%8%
2156
16th to endNight
60%412%16%5%
2496
November1st to 15thNight
56%412%18%8%
2616
16th to endNight
59%411%17%6%
2921
December1st to 15thNight
56%5%10%18%7%1
2700
16th to endNight
54%411%19%9%
2880

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
18%28%27%17%6%2
240
16th to endDay
17%27%28%19%5%1
256
February1st to 15thDay
16%25%28%19%7%1
236
16th to endDay
23%22%25%16%8%4
212
March1st to 15thDay
20%29%22%16%8%2
240
16th to endDay
21%25%30%15%6%1
276
April1st to 15thDay
28%26%18%18%5%2
302
16th to endDay
28%24%20%16%6%3
450
May1st to 15thDay
28%16%23%17%8%5%
468
16th to endDay
33%17%19%17%8%2
519
June1st to 15thDay
35%17%18%17%9%2
495
16th to endDay
33%20%22%13%7%3
495
July1st to 15thDay
31%15%21%19%8%2
475
16th to endDay
29%18%19%22%9%1
514
August1st to 15thDay
30%13%22%19%10%3
493
16th to endDay
28%12%24%21%9%3
499
September1st to 15thDay
33%16%26%18%4
310
16th to endDay
29%18%30%15%4
269
October1st to 15thDay
28%20%29%12%7%1
270
16th to endDay
28%18%23%20%6%1
288
November1st to 15thDay
27%25%24%14%6%1
280
16th to endDay
28%25%22%17%4
285
December1st to 15thDay
19%28%31%14%6%
240
16th to endDay
21%31%24%16%31
256
January1st to 15thNight
20%30%29%14%4
750
16th to endNight
18%32%26%17%4
800
February1st to 15thNight
17%28%30%19%4
734
16th to endNight
21%24%28%17%7%1
632
March1st to 15thNight
19%30%22%18%6%1
720
16th to endNight
21%29%28%15%3
596
April1st to 15thNight
26%26%20%19%6%1
539
16th to endNight
30%22%21%17%6%1
540
May1st to 15thNight
24%23%20%19%10%1
540
16th to endNight
31%21%19%19%6%
561
June1st to 15thNight
35%20%19%15%7%
512
16th to endNight
28%20%16%21%11%1
360
July1st to 15thNight
30%16%21%23%8%
423
16th to endNight
27%20%21%21%8%
565
August1st to 15thNight
30%13%19%23%11%
539
16th to endNight
26%14%23%21%11%1
573
September1st to 15thNight
30%18%25%18%5%
540
16th to endNight
28%18%31%18%3
538
October1st to 15thNight
25%19%27%20%5%
670
16th to endNight
32%17%24%19%5%
816
November1st to 15thNight
29%26%23%14%5%
805
16th to endNight
29%28%22%14%3
824
December1st to 15thNight
22%29%28%15%3
750
16th to endNight
22%30%24%16%5%
800
Page generated at 2017-12-01 13:43:35. Version ac04

Copyright 2017 A. Danko


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