Amqui
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Amqui clear sky chart from 2005-11-05 to 2018-01-12.

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
30%
15138
10%
48359
6%
15106
34%
15106
13%
36744

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
17%
806
5%
2852
2%
802
20%
802
5%
2442
January16th to endNight
23%
769
11%
2698
6%
769
30%
769
7%
2174
February1st to 15thNight
27%
704
8%
2316
4%
701
32%
701
10%
1826
February16th to endNight
24%
631
7%
1979
4%
631
28%
631
9%
1596
March1st to 15thNight
25%
720
15%
2073
9%
720
31%
720
14%
1603
March16th to endNight
30%
768
18%
2112
8%
768
37%
768
19%
1524
April1st to 15thNight
27%
611
13%
1720
7%
611
31%
611
14%
1313
April16th to endNight
30%
540
18%
1620
10%
540
38%
540
20%
1095
May1st to 15thNight
32%
540
9%
1554
7%
540
35%
540
17%
1153
May16th to endNight
32%
383
10%
1318
6%
382
37%
382
14%
959
June1st to 15thNight
43%
360
6%
1260
4%
360
45%
360
18%
876
June16th to endNight
39%
360
5%
1260
4%
360
40%
360
15%
894
July1st to 15thNight
45%
340
7%
1190
6%
340
48%
340
20%
804
July16th to endNight
50%
376
9%
1306
10%
354
52%
354
20%
857
August1st to 15thNight
54%
498
8%
1569
7%
496
55%
496
21%
1061
August16th to endNight
49%
573
13%
1719
9%
573
52%
573
23%
1157
September1st to 15thNight
40%
632
12%
1841
8%
632
43%
632
23%
1248
September16th to endNight
40%
717
18%
1980
13%
717
45%
717
26%
1322
October1st to 15thNight
35%
720
16%
2124
8%
720
43%
720
21%
1453
October16th to endNight
26%
768
10%
2448
5%
768
31%
768
13%
1846
November1st to 15thNight
26%
792
13%
2609
8%
792
33%
792
12%
1978
November16th to endNight
22%
825
7%
2766
5%
825
26%
825
7%
2285
December1st to 15thNight
16%
825
3%
2925
1%
825
18%
825
4%
2558
December16th to endNight
17%
880
5%
3120
3%
880
21%
880
4%
2720

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%10%48%7%45%45%6%25%
48998
Night
16%10%47%7%46%5%5%5%25%
48514
TransparencyDay
60%311%16%7%
48671
Night
60%311%16%6%
48359
SeeingDay
26%10%24%23%12%3
7005
Night
24%10%24%28%10%1
15138

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
13%13%6%11%12%7%8%6%6%5%9%
1330
16th to endDay
10%9%6%10%9%5%9%10%7%5%14%
1524
February1st to 15thDay
6%13%5%8%10%8%13%7%6%415%
1545
16th to endDay
11%16%6%11%9%5%7%445%16%
1491
March1st to 15thDay
15%11%5%8%7%5%7%6%5%5%21%
1876
16th to endDay
12%13%5%8%7%45%345%28%
2112
April1st to 15thDay
17%13%5%8%6%44345%24%
2227
16th to endDay
19%10%37%6%23445%31%
2340
May1st to 15thDay
21%11%47%5%24335%30%
2398
16th to endDay
25%9%37%43435%6%27%
2805
June1st to 15thDay
23%8%35%6%3435%6%29%
2700
16th to endDay
24%9%36%5%35%45%7%23%
2700
July1st to 15thDay
18%6%36%6%36%5%6%7%27%
2700
16th to endDay
17%8%35%6%36%45%6%30%
2769
August1st to 15thDay
17%8%37%6%35%5%6%8%27%
2368
16th to endDay
14%7%36%6%35%6%6%8%30%
2483
September1st to 15thDay
20%7%26%5%33445%35%
2118
16th to endDay
18%8%35%423336%38%
1980
October1st to 15thDay
17%10%37%6%34445%31%
1836
16th to endDay
24%15%47%5%23445%22%
1775
November1st to 15thDay
18%14%5%9%6%45%35%5%21%
1579
16th to endDay
19%15%6%12%9%34335%15%
1521
December1st to 15thDay
18%13%6%13%12%6%6%43410%
1365
16th to endDay
15%15%7%12%10%5%7%6%5%39%
1456
January1st to 15thNight
13%13%5%10%12%6%6%7%6%5%10%
2852
16th to endNight
9%12%5%8%8%6%11%10%6%415%
2698
February1st to 15thNight
6%11%6%8%10%7%10%7%6%5%18%
2315
16th to endNight
13%15%5%8%7%6%8%6%5%5%18%
1979
March1st to 15thNight
14%11%5%8%7%47%5%3426%
2061
16th to endNight
12%14%46%6%35%44433%
2112
April1st to 15thNight
20%10%46%6%45%445%26%
1720
16th to endNight
21%10%34212446%36%
1620
May1st to 15thNight
20%11%47%5%35%44428%
1554
16th to endNight
18%7%38%6%35%5%6%6%27%
1316
June1st to 15thNight
20%7%36%4246%5%6%30%
1260
16th to endNight
20%7%37%6%35%5%45%30%
1260
July1st to 15thNight
17%7%35%5%445%6%7%32%
1260
16th to endNight
12%6%25%6%35%6%6%8%35%
1396
August1st to 15thNight
13%6%27%5%446%6%8%33%
1579
16th to endNight
12%5%25%5%45%6%6%8%36%
1719
September1st to 15thNight
16%6%25%5%35%346%39%
1841
16th to endNight
18%5%24433335%44%
1980
October1st to 15thNight
17%6%25%435%446%36%
2124
16th to endNight
22%11%36%5%3445%6%25%
2448
November1st to 15thNight
21%10%47%5%35%446%26%
2609
16th to endNight
19%12%5%10%7%46%5%5%5%17%
2766
December1st to 15thNight
18%15%6%11%10%5%7%6%4310%
2925
16th to endNight
16%13%6%11%10%7%8%5%4410%
3120

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
77%29%8%2
1331
16th to endDay
66%48%14%4
1524
February1st to 15thDay
68%311%12%3
1548
16th to endDay
70%26%14%5%
1491
March1st to 15thDay
63%49%15%7%
1887
16th to endDay
57%29%19%9%1
2112
April1st to 15thDay
62%17%17%8%2
2227
16th to endDay
54%27%19%13%1
2340
May1st to 15thDay
57%28%19%10%1
2398
16th to endDay
59%310%18%8%
2809
June1st to 15thDay
55%411%16%11%1
2700
16th to endDay
59%410%16%8%
2700
July1st to 15thDay
53%415%19%6%
2541
16th to endDay
54%414%19%7%
2596
August1st to 15thDay
54%416%20%3
2354
16th to endDay
49%5%19%19%5%
2483
September1st to 15thDay
51%315%22%6%
2118
16th to endDay
48%314%24%8%
1980
October1st to 15thDay
55%315%16%8%
1836
16th to endDay
65%210%16%4
1775
November1st to 15thDay
65%311%14%4
1579
16th to endDay
74%211%9%2
1521
December1st to 15thDay
79%39%6%1
1365
16th to endDay
80%36%8%1
1456
January1st to 15thNight
76%38%8%2
2852
16th to endNight
68%45%14%6%
2698
February1st to 15thNight
65%49%15%4
2316
16th to endNight
68%38%13%5%
1979
March1st to 15thNight
62%26%18%9%
2073
16th to endNight
53%28%20%12%2
2112
April1st to 15thNight
61%27%14%12%1
1720
16th to endNight
49%27%22%16%1
1620
May1st to 15thNight
58%29%18%10%1
1554
16th to endNight
55%5%9%20%7%
1318
June1st to 15thNight
52%411%20%10%1
1260
16th to endNight
54%5%11%17%11%
1260
July1st to 15thNight
49%416%23%6%
1190
16th to endNight
45%6%17%20%9%
1306
August1st to 15thNight
46%6%20%22%3
1569
16th to endNight
44%6%21%22%5%
1719
September1st to 15thNight
48%214%25%8%
1841
16th to endNight
44%315%24%11%1
1980
October1st to 15thNight
47%414%23%8%1
2124
16th to endNight
60%314%17%4
2448
November1st to 15thNight
61%312%16%5%
2609
16th to endNight
71%410%10%3
2766
December1st to 15thNight
80%28%7%1
2925
16th to endNight
79%27%8%2
3120

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
19%19%35%20%4
82
16th to endDay
14%20%29%25%9%1
64
February1st to 15thDay
16%10%29%31%10%2
206
16th to endDay
27%15%24%20%10%1
224
March1st to 15thDay
25%15%24%22%10%1
270
16th to endDay
25%15%22%20%13%3
288
April1st to 15thDay
27%14%28%16%11%2
270
16th to endDay
27%10%25%22%9%4
270
May1st to 15thDay
28%9%25%22%10%3
354
16th to endDay
32%12%22%19%10%2
519
June1st to 15thDay
31%9%16%27%13%1
495
16th to endDay
29%6%25%23%12%3
495
July1st to 15thDay
22%422%27%16%5%
475
16th to endDay
20%6%23%31%14%3
440
August1st to 15thDay
20%6%24%27%15%5%
313
16th to endDay
23%8%24%25%12%5%
332
September1st to 15thDay
25%7%25%23%13%4
315
16th to endDay
26%9%24%21%14%4
314
October1st to 15thDay
22%13%25%20%13%3
279
16th to endDay
39%11%17%15%14%1
288
November1st to 15thDay
33%11%23%18%10%2
280
16th to endDay
31%12%26%21%6%1
246
December1st to 15thDay
28%17%26%17%7%1
90
16th to endDay
23%26%28%18%3
96
January1st to 15thNight
23%13%32%26%4
806
16th to endNight
18%16%29%27%7%
769
February1st to 15thNight
15%11%30%29%11%1
704
16th to endNight
23%10%29%25%10%
631
March1st to 15thNight
23%12%28%26%8%1
720
16th to endNight
21%12%23%28%11%2
768
April1st to 15thNight
30%12%21%26%8%
611
16th to endNight
27%9%23%27%9%1
540
May1st to 15thNight
27%7%21%32%9%1
540
16th to endNight
23%6%26%31%11%
383
June1st to 15thNight
21%6%18%39%13%
360
16th to endNight
21%422%36%14%
360
July1st to 15thNight
21%419%37%16%
340
16th to endNight
16%5%15%40%21%1
376
August1st to 15thNight
18%314%38%23%1
498
16th to endNight
18%420%37%17%2
573
September1st to 15thNight
21%6%24%33%12%2
632
16th to endNight
22%6%24%34%10%1
717
October1st to 15thNight
22%10%24%28%11%1
720
16th to endNight
31%12%22%22%9%1
768
November1st to 15thNight
31%11%22%25%7%1
792
16th to endNight
29%13%24%22%8%
825
December1st to 15thNight
29%14%25%24%5%
825
16th to endNight
27%16%22%22%8%1
880
Page generated at 2018-01-12 22:01:28. Version ac04

Copyright 2018 A. Danko


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