Lebanon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lebanon clear sky chart from 2005-11-06 to 2024-03-08.

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
47%
22894
13%
80721
14%
22802
49%
22802
17%
57920

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
27%
754
4%
4402
7%
736
29%
736
4%
3891
January11th to 20thNight
32%
757
7%
4407
9%
740
34%
740
5%
3693
January21st to endNight
38%
834
8%
4493
13%
814
40%
814
7%
3748
February1st to 10thNight
38%
760
8%
2470
9%
760
38%
760
10%
2002
February11th to 20thNight
36%
740
9%
2404
9%
740
39%
740
12%
1859
February21st to endNight
33%
628
12%
1960
11%
628
35%
628
12%
1551
March1st to 10thNight
34%
750
9%
2138
7%
750
35%
750
13%
1712
March11th to 20thNight
40%
720
11%
1980
9%
720
42%
720
16%
1532
March21st to endNight
30%
792
5%
2142
3%
792
31%
792
10%
1804
April1st to 10thNight
35%
720
8%
1800
5%
720
35%
720
14%
1479
April11th to 20thNight
41%
711
10%
1779
5%
711
42%
711
18%
1399
April21st to endNight
44%
558
11%
1638
8%
558
45%
558
16%
1220
May1st to 10thNight
48%
437
14%
1517
13%
437
51%
437
20%
994
May11th to 20thNight
50%
354
12%
1416
15%
354
51%
354
15%
964
May21st to endNight
49%
389
9%
1552
12%
388
52%
388
14%
1064
June1st to 10thNight
50%
360
10%
1440
13%
360
53%
360
17%
933
June11th to 20thNight
49%
360
11%
1440
15%
360
53%
360
20%
901
June21st to endNight
64%
360
18%
1440
26%
360
70%
360
34%
699
July1st to 10thNight
73%
350
20%
1400
29%
350
78%
350
45%
588
July11th to 20thNight
64%
348
28%
1392
32%
348
78%
348
48%
567
July21st to endNight
80%
416
36%
1509
44%
393
89%
393
72%
493
August1st to 10thNight
82%
537
28%
1602
24%
534
86%
534
60%
716
August11th to 20thNight
81%
534
33%
1602
26%
534
84%
534
57%
738
August21st to endNight
70%
727
35%
1915
21%
727
74%
727
55%
993
September1st to 10thNight
70%
720
33%
1800
19%
720
73%
720
57%
969
September11th to 20thNight
70%
720
28%
1804
19%
720
71%
720
42%
1080
September21st to endNight
62%
720
25%
2062
23%
720
64%
720
35%
1239
October1st to 10thNight
57%
720
16%
2160
17%
720
60%
720
28%
1368
October11th to 20thNight
57%
720
20%
2160
22%
720
59%
720
26%
1420
October21st to endNight
44%
792
18%
2388
17%
792
47%
792
19%
1709
November1st to 10thNight
38%
740
12%
2485
14%
740
39%
740
12%
1908
November11th to 20thNight
37%
760
9%
2660
10%
760
38%
760
10%
2096
November21st to endNight
44%
760
10%
2660
10%
760
46%
760
14%
1953
December1st to 10thNight
42%
760
11%
2660
12%
760
44%
760
14%
1971
December11th to 20thNight
33%
759
8%
3208
8%
759
34%
759
8%
2588
December21st to endNight
25%
827
4%
4836
7%
817
26%
817
4%
4079

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%8%35%5%34446%36%
78533
Night
26%8%36%5%34445%33%
81046
TransparencyDay
50%5%11%18%12%3
78238
Night
54%5%10%17%10%3
80862
SeeingDay
23%7%20%28%17%5%
13770
Night
27%5%11%31%23%3
22919

By Month

Percentage Cloud Cover SW (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
40%16%38%6%444339%
2539
11th to 20thDay
42%12%36%5%25%44414%
2540
21st to endDay
39%9%36%5%345%5%6%15%
3128
February1st to 10thDay
31%11%46%7%45%45%7%17%
1710
11th to 20thDay
31%12%27%6%45%446%20%
1665
21st to endDay
33%12%47%5%35%43419%
1494
March1st to 10thDay
30%11%37%6%46%45%6%17%
1978
11th to 20thDay
32%9%36%5%35%35%5%23%
1980
21st to endDay
31%12%5%8%6%45%445%16%
2213
April1st to 10thDay
31%12%38%6%45%35%5%17%
2160
11th to 20thDay
28%10%46%5%25%446%25%
2129
21st to endDay
27%7%35%5%35%45%7%28%
2320
May1st to 10thDay
19%7%36%5%35%5%5%6%36%
2443
11th to 20thDay
22%8%36%5%4445%8%31%
2477
21st to endDay
26%6%36%5%25%5%5%7%30%
2723
June1st to 10thDay
26%6%36%423445%35%
2520
11th to 20thDay
21%6%36%5%35%45%7%35%
2520
21st to endDay
12%314323336%59%
2520
July1st to 10thDay
6%412322335%69%
2520
11th to 20thDay
7%213213235%69%
2520
21st to endDay
431211223478%
2715
August1st to 10thDay
4312323336%70%
2328
11th to 20thDay
5%213222346%70%
2298
21st to endDay
5%313324446%65%
2440
September1st to 10thDay
8%312212336%70%
2160
11th to 20thDay
13%5%35%5%23447%49%
2153
21st to endDay
17%6%24434345%48%
1897
October1st to 10thDay
19%6%24424446%44%
1800
11th to 20thDay
23%7%26%5%45%5%47%34%
1800
21st to endDay
27%8%27%5%34447%29%
1967
November1st to 10thDay
34%8%37%6%34446%21%
1594
11th to 20thDay
34%8%36%6%36%45%6%20%
1520
21st to endDay
31%8%37%5%45%5%5%6%22%
1520
December1st to 10thDay
29%8%36%7%44346%26%
1520
11th to 20thDay
34%9%47%9%5%5%46%6%11%
1928
21st to endDay
35%14%47%8%45%445%9%
2794
January1st to 10thNight
38%17%49%6%3433310%
4406
11th to 20thNight
43%13%36%5%2433414%
4420
21st to endNight
40%12%46%5%34335%16%
4523
February1st to 10thNight
32%11%46%6%35%445%19%
2470
11th to 20thNight
32%10%36%5%34345%26%
2402
21st to endNight
34%11%35%5%33346%23%
1960
March1st to 10thNight
29%12%46%6%3446%5%22%
2138
11th to 20thNight
29%8%35%6%3445%7%25%
1980
21st to endNight
34%11%38%6%3444419%
2142
April1st to 10thNight
32%13%46%5%33445%23%
1800
11th to 20thNight
26%9%36%43445%6%29%
1779
21st to endNight
28%7%25%5%2445%7%31%
1638
May1st to 10thNight
20%7%37%5%33346%40%
1517
11th to 20thNight
19%7%37%7%44446%35%
1416
21st to endNight
21%8%36%435%46%7%34%
1552
June1st to 10thNight
21%6%35%43445%7%39%
1440
11th to 20thNight
17%6%36%5%3445%8%41%
1440
21st to endNight
10%41432334463%
1440
July1st to 10thNight
7%21222334471%
1440
11th to 20thNight
6%31231323472%
1440
21st to endNight
411111123383%
1598
August1st to 10thNight
3212213346%73%
1611
11th to 20thNight
421232223475%
1602
21st to endNight
6%213223236%70%
1915
September1st to 10thNight
8%212222235%70%
1800
11th to 20thNight
10%314434446%56%
1804
21st to endNight
14%5%25%32435%6%52%
2062
October1st to 10thNight
19%5%25%5%22335%48%
2160
11th to 20thNight
20%6%25%32445%5%44%
2160
21st to endNight
27%8%34423435%37%
2388
November1st to 10thNight
32%8%26%6%34446%24%
2485
11th to 20thNight
36%7%35%6%34445%22%
2660
21st to endNight
29%7%35%6%34445%30%
2660
December1st to 10thNight
30%8%36%434446%27%
2660
11th to 20thNight
32%11%37%7%35%446%18%
3276
21st to endNight
32%11%412%9%3443413%
4862

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
78%7%7%6%21
2539
11th to 20thDay
72%47%9%5%3
2540
21st to endDay
70%6%8%10%5%1
3128
February1st to 10thDay
66%5%11%11%6%
1710
11th to 20thDay
67%6%11%9%5%2
1674
21st to endDay
70%48%10%5%2
1494
March1st to 10thDay
67%6%10%12%4
1978
11th to 20thDay
64%411%15%5%1
1980
21st to endDay
72%7%9%10%3
2213
April1st to 10thDay
71%5%10%10%4
2160
11th to 20thDay
63%5%11%12%7%3
2132
21st to endDay
57%7%15%12%8%1
2320
May1st to 10thDay
49%6%15%20%8%1
2443
11th to 20thDay
53%6%14%19%6%1
2480
21st to endDay
55%6%17%20%3
2724
June1st to 10thDay
53%5%15%21%5%
2520
11th to 20thDay
50%5%18%20%6%
2520
21st to endDay
29%417%33%13%4
2520
July1st to 10thDay
20%414%29%26%7%
2451
11th to 20thDay
20%38%25%33%10%
2445
21st to endDay
13%26%32%38%9%
2564
August1st to 10thDay
17%5%13%36%23%6%
2312
11th to 20thDay
17%312%36%25%7%
2298
21st to endDay
21%411%32%28%5%
2440
September1st to 10thDay
19%29%32%23%14%
2160
11th to 20thDay
35%6%12%23%17%7%
2153
21st to endDay
39%5%11%22%17%7%
1897
October1st to 10thDay
42%411%20%17%6%
1800
11th to 20thDay
48%6%12%17%14%3
1800
21st to endDay
55%6%10%13%14%2
1967
November1st to 10thDay
65%5%11%15%5%
1594
11th to 20thDay
63%7%10%10%7%3
1520
21st to endDay
61%6%9%8%14%2
1520
December1st to 10thDay
59%6%10%12%12%2
1520
11th to 20thDay
66%10%8%12%3
1928
21st to endDay
71%10%8%8%31
2794
January1st to 10thNight
78%6%6%5%31
4406
11th to 20thNight
75%45%10%42
4420
21st to endNight
73%46%10%6%1
4523
February1st to 10thNight
67%5%10%11%5%1
2470
11th to 20thNight
62%5%12%11%7%2
2404
21st to endNight
64%5%9%12%7%2
1960
March1st to 10thNight
64%5%11%14%6%
2138
11th to 20thNight
59%5%13%15%6%1
1980
21st to endNight
70%5%12%11%2
2142
April1st to 10thNight
67%412%13%5%
1800
11th to 20thNight
58%7%15%12%5%4
1779
21st to endNight
56%6%14%16%6%3
1638
May1st to 10thNight
48%414%23%9%3
1517
11th to 20thNight
51%6%15%19%5%4
1416
21st to endNight
52%6%17%21%4
1552
June1st to 10thNight
45%8%15%27%5%
1440
11th to 20thNight
44%5%19%24%7%
1440
21st to endNight
28%416%35%13%5%
1440
July1st to 10thNight
19%413%30%25%10%
1400
11th to 20thNight
18%311%23%34%12%
1392
21st to endNight
7%26%33%40%12%
1509
August1st to 10thNight
14%415%39%21%7%
1602
11th to 20thNight
16%311%38%26%6%
1602
21st to endNight
18%49%37%25%7%
1915
September1st to 10thNight
20%39%32%24%13%
1800
11th to 20thNight
29%6%13%29%14%10%
1804
21st to endNight
35%412%23%17%9%
2062
October1st to 10thNight
40%5%9%23%17%6%
2160
11th to 20thNight
41%7%12%19%17%4
2160
21st to endNight
52%5%8%14%17%4
2388
November1st to 10thNight
61%6%10%14%9%1
2485
11th to 20thNight
65%5%10%9%8%3
2660
21st to endNight
56%6%9%12%12%5%
2660
December1st to 10thNight
58%5%11%14%11%2
2660
11th to 20thNight
65%7%10%11%7%
3276
21st to endNight
68%13%7%9%21
4862

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
49%8%11%17%11%3
180
11th to 20thDay
46%6%13%20%11%5%
180
21st to endDay
35%7%17%19%17%5%
402
February1st to 10thDay
37%7%16%26%12%3
370
11th to 20thDay
37%7%21%22%9%3
365
21st to endDay
37%12%18%19%12%2
346
March1st to 10thDay
35%9%22%23%8%2
449
11th to 20thDay
34%7%20%25%11%3
420
21st to endDay
34%12%23%20%10%1
462
April1st to 10thDay
37%10%19%21%10%3
420
11th to 20thDay
34%11%22%19%10%4
412
21st to endDay
29%10%24%24%10%3
420
May1st to 10thDay
20%12%23%27%13%4
423
11th to 20thDay
28%8%18%24%17%6%
448
21st to endDay
20%9%20%28%16%7%
485
June1st to 10thDay
23%7%21%28%16%5%
450
11th to 20thDay
20%10%28%26%14%2
450
21st to endDay
8%422%42%17%6%
450
July1st to 10thDay
7%5%20%41%23%4
446
11th to 20thDay
45%26%38%20%7%
444
21st to endDay
4321%41%23%8%
487
August1st to 10thDay
3119%43%26%7%
447
11th to 20thDay
3315%44%25%10%
437
21st to endDay
5%5%26%35%23%7%
495
September1st to 10thDay
9%5%24%34%22%6%
450
11th to 20thDay
16%417%32%25%6%
450
21st to endDay
19%6%20%32%19%5%
450
October1st to 10thDay
20%7%20%25%18%9%
450
11th to 20thDay
22%7%15%26%23%8%
450
21st to endDay
29%8%20%21%16%6%
482
November1st to 10thDay
34%6%20%25%11%3
232
11th to 20thDay
29%8%21%16%17%9%
180
21st to endDay
34%5%17%19%18%7%
180
December1st to 10thDay
38%7%13%19%13%9%
180
11th to 20thDay
46%216%20%12%4
180
21st to endDay
44%5%15%18%17%2
198
January1st to 10thNight
42%7%11%21%15%4
760
11th to 20thNight
40%7%9%21%19%4
760
21st to endNight
35%48%32%17%4
836
February1st to 10thNight
37%48%30%18%2
760
11th to 20thNight
37%5%11%29%17%1
744
21st to endNight
38%6%13%25%18%
628
March1st to 10thNight
35%8%12%29%15%1
750
11th to 20thNight
32%6%12%32%17%2
720
21st to endNight
40%5%13%26%14%2
792
April1st to 10thNight
37%7%9%27%18%1
720
11th to 20thNight
29%6%15%29%19%2
711
21st to endNight
31%412%32%19%2
558
May1st to 10thNight
22%6%15%34%22%2
437
11th to 20thNight
19%410%30%33%3
354
21st to endNight
24%411%31%27%3
389
June1st to 10thNight
21%7%11%36%24%1
360
11th to 20thNight
20%318%38%20%1
360
21st to endNight
11%314%41%30%1
360
July1st to 10thNight
7%212%46%32%1
350
11th to 20thNight
7%321%41%26%1
348
21st to endNight
3113%47%34%1
416
August1st to 10thNight
417%35%45%7%
537
11th to 20thNight
5%15%35%48%6%
534
21st to endNight
7%315%38%33%5%
727
September1st to 10thNight
9%214%36%36%3
720
11th to 20thNight
12%37%32%38%8%
720
21st to endNight
16%311%34%32%4
720
October1st to 10thNight
19%311%33%30%5%
720
11th to 20thNight
21%411%30%28%7%
720
21st to endNight
32%412%28%19%6%
792
November1st to 10thNight
34%6%12%29%17%2
740
11th to 20thNight
38%6%11%25%17%3
760
21st to endNight
31%5%9%32%19%5%
760
December1st to 10thNight
33%5%8%30%19%5%
760
11th to 20thNight
41%411%25%17%2
760
21st to endNight
44%6%12%25%11%1
836
Page generated at 2024-03-05 04:23:59. Version ac07

Copyright © 2024 Attilla Danko.


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