Ebo Landing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ebo Landing clear sky chart from 2005-11-05 to 2017-09-22.

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
50%
15896
21%
46964
15%
15856
57%
15856
25%
29411

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
34%
717
21%
2327
11%
716
47%
716
22%
1401
January16th to endNight
37%
768
22%
2496
14%
768
49%
768
22%
1528
February1st to 15thNight
37%
703
23%
2141
13%
700
48%
700
23%
1329
February16th to endNight
39%
631
24%
1842
14%
631
50%
631
24%
1166
March1st to 15thNight
45%
720
28%
1980
15%
720
55%
720
33%
1151
March16th to endNight
47%
768
24%
2112
13%
768
56%
768
31%
1249
April1st to 15thNight
48%
718
24%
1971
15%
718
56%
718
33%
1180
April16th to endNight
53%
702
29%
1782
16%
702
60%
702
37%
1020
May1st to 15thNight
58%
539
24%
1619
18%
539
62%
539
32%
949
May16th to endNight
59%
561
20%
1683
11%
561
65%
561
27%
1015
June1st to 15thNight
63%
540
15%
1620
12%
540
64%
540
25%
1037
June16th to endNight
62%
540
11%
1620
8%
540
64%
540
22%
1067
July1st to 15thNight
66%
510
11%
1530
9%
510
67%
510
24%
983
July16th to endNight
64%
564
12%
1595
11%
531
69%
531
24%
1055
August1st to 15thNight
65%
539
11%
1609
11%
536
66%
536
23%
1085
August16th to endNight
58%
699
13%
1924
11%
699
60%
699
20%
1394
September1st to 15thNight
59%
720
13%
1980
12%
720
59%
720
20%
1451
September16th to endNight
48%
685
14%
1892
9%
685
53%
685
16%
1404
October1st to 15thNight
54%
660
26%
1906
23%
660
58%
660
27%
1200
October16th to endNight
58%
704
31%
2112
27%
704
66%
704
33%
1210
November1st to 15thNight
50%
700
29%
2101
24%
700
58%
700
30%
1210
November16th to endNight
43%
720
26%
2286
17%
720
56%
720
26%
1344
December1st to 15thNight
41%
720
23%
2340
15%
720
52%
720
24%
1408
December16th to endNight
41%
768
23%
2496
16%
768
52%
768
20%
1575

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
10%425%5%35%5%6%9%42%
47905
Night
10%5%245%3446%8%43%
47168
TransparencyDay
35%7%16%21%14%4
47606
Night
36%6%14%20%15%6%
46971
SeeingDay
10%9%8%21%31%18%
5742
Night
11%17%11%23%27%8%
15903

By Month

Percentage Cloud Cover SE (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
11%6%36%43345%6%44%
1611
16th to endDay
13%5%2443445%6%45%
1728
February1st to 15thDay
13%5%25%42445%5%45%
1714
16th to endDay
12%5%245%24236%48%
1629
March1st to 15thDay
9%42331435%6%54%
1980
16th to endDay
10%4245%2435%6%50%
2111
April1st to 15thDay
8%41442445%8%51%
1975
16th to endDay
7%313424449%53%
2187
May1st to 15thDay
7%31342445%11%50%
2331
16th to endDay
9%314435%6%6%8%44%
2431
June1st to 15thDay
8%5%245%36%7%9%11%34%
2340
16th to endDay
7%425%6%48%7%8%11%33%
2340
July1st to 15thDay
7%325%5%46%7%9%13%34%
2340
16th to endDay
7%425%7%47%8%9%12%29%
2465
August1st to 15thDay
7%427%8%5%7%7%8%14%25%
2340
16th to endDay
12%6%26%6%47%7%8%10%26%
2261
September1st to 15thDay
11%428%6%37%6%7%9%31%
1980
16th to endDay
17%7%35%6%36%6%6%8%27%
1881
October1st to 15thDay
11%5%25%5%2445%7%45%
1724
16th to endDay
9%413324447%53%
1760
November1st to 15thDay
7%5%2432445%7%52%
1757
16th to endDay
10%4245%23346%51%
1672
December1st to 15thDay
12%5%35%6%34447%43%
1620
16th to endDay
10%6%25%5%35%45%7%43%
1728
January1st to 15thNight
12%7%34433446%45%
2327
16th to endNight
14%435%5%24346%46%
2496
February1st to 15thNight
14%5%245%23345%47%
2137
16th to endNight
13%4345%25%45%5%45%
1842
March1st to 15thNight
8%414324348%52%
1980
16th to endNight
8%424423346%53%
2112
April1st to 15thNight
9%413424347%52%
1971
16th to endNight
6%322424348%55%
1782
May1st to 15thNight
7%3244245%6%8%49%
1619
16th to endNight
7%424436%5%5%10%45%
1682
June1st to 15thNight
9%425%5%46%5%8%12%35%
1620
16th to endNight
7%325%5%45%7%9%15%31%
1620
July1st to 15thNight
8%425%5%36%7%9%12%35%
1620
16th to endNight
6%4346%37%7%10%13%32%
1703
August1st to 15thNight
8%425%7%47%6%10%13%30%
1620
16th to endNight
14%5%25%5%36%7%7%11%28%
1924
September1st to 15thNight
11%6%36%7%36%5%7%10%29%
1980
16th to endNight
18%6%38%6%35%6%5%9%26%
1892
October1st to 15thNight
13%5%25%42335%7%46%
1906
16th to endNight
9%313434445%54%
2112
November1st to 15thNight
8%424423447%52%
2101
16th to endNight
11%42342335%7%49%
2286
December1st to 15thNight
13%5%35%42435%8%44%
2340
16th to endNight
13%7%25%42445%6%41%
2496

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
40%310%20%16%8%
1612
16th to endDay
38%48%19%20%7%
1728
February1st to 15thDay
38%49%13%22%11%
1716
16th to endDay
37%38%18%21%10%
1629
March1st to 15thDay
29%411%25%21%7%
1980
16th to endDay
33%5%13%19%21%6%
2112
April1st to 15thDay
31%5%11%24%19%8%
1975
16th to endDay
26%415%24%21%6%
2187
May1st to 15thDay
26%6%15%28%18%4
2331
16th to endDay
31%8%16%24%16%2
2435
June1st to 15thDay
35%10%21%23%8%
2340
16th to endDay
36%11%24%20%7%
2340
July1st to 15thDay
31%11%32%21%2
2201
16th to endDay
35%12%26%19%4
2310
August1st to 15thDay
40%15%24%16%2
2327
16th to endDay
43%13%23%16%2
2261
September1st to 15thDay
42%10%18%17%9%
1980
16th to endDay
49%8%16%14%8%2
1881
October1st to 15thDay
37%5%10%21%18%7%
1724
16th to endDay
29%48%23%21%12%
1760
November1st to 15thDay
30%310%23%22%8%
1757
16th to endDay
32%210%23%20%9%
1672
December1st to 15thDay
41%5%10%23%13%5%
1620
16th to endDay
39%414%22%12%6%
1728
January1st to 15thNight
38%410%19%19%7%
2327
16th to endNight
40%38%14%22%10%
2496
February1st to 15thNight
39%36%16%20%12%
2146
16th to endNight
40%49%16%18%11%
1842
March1st to 15thNight
29%314%23%18%9%
1980
16th to endNight
31%412%20%22%8%
2112
April1st to 15thNight
30%6%9%23%19%10%
1971
16th to endNight
27%314%23%24%7%
1782
May1st to 15thNight
29%7%13%24%19%4
1620
16th to endNight
32%7%17%25%13%2
1684
June1st to 15thNight
36%8%20%24%8%
1620
16th to endNight
36%12%23%19%7%
1620
July1st to 15thNight
34%11%28%21%3
1530
16th to endNight
36%12%24%22%3
1595
August1st to 15thNight
38%12%29%16%3
1609
16th to endNight
44%12%20%18%3
1924
September1st to 15thNight
46%10%17%15%8%1
1980
16th to endNight
52%7%13%14%9%2
1892
October1st to 15thNight
37%5%10%20%18%7%
1906
16th to endNight
30%47%20%22%13%
2112
November1st to 15thNight
33%38%22%22%9%
2101
16th to endNight
36%39%18%21%10%
2286
December1st to 15thNight
38%414%22%16%5%
2340
16th to endNight
41%5%10%22%12%8%
2496

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
17%6%21%32%12%10%
90
16th to endDay
16%427%33%17%1
96
February1st to 15thDay
12%425%33%23%1
90
16th to endDay
11%7%23%45%11%
130
March1st to 15thDay
11%15%21%29%20%1
270
16th to endDay
12%13%15%30%21%6%
288
April1st to 15thDay
8%12%21%27%24%5%
270
16th to endDay
5%12%11%22%33%14%
270
May1st to 15thDay
6%11%10%34%29%8%
288
16th to endDay
6%11%317%31%28%
331
June1st to 15thDay
11%11%112%37%26%
315
16th to endDay
9%10%11%40%27%
315
July1st to 15thDay
47%5%41%40%
305
16th to endDay
6%10%7%42%31%
326
August1st to 15thDay
8%7%18%40%33%
313
16th to endDay
9%6%16%34%41%
332
September1st to 15thDay
16%6%115%39%20%
315
16th to endDay
20%8%312%37%17%
278
October1st to 15thDay
18%8%6%30%26%8%
255
16th to endDay
8%8%10%28%34%9%
272
November1st to 15thDay
12%12%14%29%22%9%
265
16th to endDay
10%7%16%35%21%7%
142
December1st to 15thDay
4220%44%26%2
90
16th to endDay
17%212%34%27%6%
96
January1st to 15thNight
12%22%23%25%12%2
720
16th to endNight
12%21%21%32%11%
768
February1st to 15thNight
14%21%21%28%14%
704
16th to endNight
14%19%18%35%11%
631
March1st to 15thNight
10%18%18%32%16%1
720
16th to endNight
9%19%15%31%21%1
768
April1st to 15thNight
9%18%17%26%23%3
718
16th to endNight
8%18%12%23%30%5%
702
May1st to 15thNight
6%17%11%32%25%7%
540
16th to endNight
8%17%419%33%15%
563
June1st to 15thNight
8%17%19%40%13%
540
16th to endNight
9%17%116%37%18%
540
July1st to 15thNight
7%12%112%41%23%
510
16th to endNight
5%17%11%45%19%
564
August1st to 15thNight
10%10%11%46%21%
539
16th to endNight
14%10%29%40%23%
699
September1st to 15thNight
12%9%113%44%17%
720
16th to endNight
19%11%216%36%12%
685
October1st to 15thNight
18%10%7%22%33%7%
660
16th to endNight
9%12%12%23%35%6%
704
November1st to 15thNight
10%19%12%32%23%3
700
16th to endNight
9%20%17%29%18%5%
720
December1st to 15thNight
12%21%17%23%20%5%
720
16th to endNight
12%22%14%29%19%2
768
Page generated at 2017-09-23 06:43:40. Version ac04

Copyright 2017 A. Danko


Ebo Landing Clear Sky Chart | Charts Home