Redondo Beach
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Redondo Beach clear sky chart from 2005-11-06 to 2024-01-15.

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
70%
24436
30%
74433
27%
24382
73%
24382
41%
40305

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
66%
756
26%
2646
27%
756
71%
756
36%
1363
January11th to 20thNight
71%
738
34%
2390
33%
738
77%
738
43%
1215
January21st to endNight
65%
792
37%
2376
33%
792
72%
792
43%
1270
February1st to 10thNight
66%
720
34%
2160
32%
720
72%
720
40%
1166
February11th to 20thNight
62%
700
32%
2098
30%
700
69%
700
41%
1127
February21st to endNight
60%
592
28%
1776
27%
592
66%
592
38%
990
March1st to 10thNight
60%
720
26%
2160
26%
720
65%
720
37%
1228
March11th to 20thNight
63%
720
22%
2098
22%
720
66%
720
35%
1255
March21st to endNight
63%
792
29%
1980
21%
792
68%
792
44%
1170
April1st to 10thNight
63%
720
26%
1800
18%
720
65%
720
41%
1106
April11th to 20thNight
66%
711
31%
1779
18%
711
70%
711
49%
998
April21st to endNight
65%
720
27%
1800
14%
720
67%
720
43%
1074
May1st to 10thNight
67%
692
23%
1772
14%
692
69%
692
42%
1059
May11th to 20thNight
68%
531
25%
1595
20%
531
69%
531
39%
911
May21st to endNight
69%
582
27%
1746
20%
582
72%
582
46%
941
June1st to 10thNight
69%
511
19%
1591
16%
511
70%
511
34%
966
June11th to 20thNight
77%
360
28%
1440
34%
360
77%
360
38%
678
June21st to endNight
73%
360
26%
1440
30%
360
73%
360
30%
753
July1st to 10thNight
79%
350
31%
1400
37%
350
79%
350
40%
639
July11th to 20thNight
81%
367
28%
1411
31%
367
81%
367
40%
662
July21st to endNight
76%
788
23%
1860
16%
744
76%
744
47%
1088
August1st to 10thNight
79%
716
28%
1780
18%
712
79%
712
53%
983
August11th to 20thNight
78%
712
31%
1780
20%
712
79%
712
52%
991
August21st to endNight
79%
792
32%
1980
23%
792
79%
792
52%
1105
September1st to 10thNight
78%
720
33%
1800
26%
720
78%
720
51%
1000
September11th to 20thNight
79%
720
37%
1920
35%
720
80%
720
56%
959
September21st to endNight
78%
720
36%
1980
36%
720
80%
720
57%
971
October1st to 10thNight
77%
720
35%
1980
35%
720
79%
720
52%
1021
October11th to 20thNight
76%
720
35%
2110
36%
720
78%
720
47%
1091
October21st to endNight
78%
792
38%
2389
40%
792
81%
792
54%
1141
November1st to 10thNight
74%
740
33%
2405
36%
740
77%
740
48%
1126
November11th to 20thNight
77%
760
36%
2470
39%
760
80%
760
49%
1157
November21st to endNight
72%
760
32%
2470
33%
760
75%
760
41%
1273
December1st to 10thNight
67%
760
30%
2470
30%
760
71%
760
37%
1335
December11th to 20thNight
62%
760
28%
2971
31%
759
68%
759
25%
1795
December21st to endNight
62%
822
19%
4610
30%
817
69%
817
19%
2698

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
5%423323347%64%
74986
Night
6%6%2442435%7%56%
74785
TransparencyDay
21%48%18%25%23%
74713
Night
26%5%9%17%22%22%
74579
SeeingDay
5%6%22%37%22%7%
14509
Night
7%210%32%37%11%
24460

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
8%42433435%7%56%
1519
11th to 20thDay
6%424333446%61%
1653
21st to endDay
10%5%24323246%59%
1980
February1st to 10thDay
9%423324335%62%
1800
11th to 20thDay
7%21242335%7%62%
1750
21st to endDay
7%42332345%6%60%
1480
March1st to 10thDay
6%424435%5%6%7%55%
1800
11th to 20thDay
7%4243234411%56%
1855
21st to endDay
5%3234245%5%6%62%
2376
April1st to 10thDay
5%42342345%8%59%
2160
11th to 20thDay
3313323347%67%
2129
21st to endDay
4313312337%68%
2160
May1st to 10thDay
45%2342245%8%61%
2186
11th to 20thDay
5%6%24313247%64%
2301
21st to endDay
46%24323348%62%
2530
June1st to 10thDay
7%6%24322348%58%
2362
11th to 20thDay
45%23322248%67%
2520
21st to endDay
35%24323335%67%
2520
July1st to 10thDay
35%24322347%66%
2520
11th to 20thDay
3313312346%70%
2490
21st to endDay
231332335%8%67%
2350
August1st to 10thDay
2312222236%73%
2149
11th to 20thDay
3312212346%74%
2122
21st to endDay
2212313347%72%
2376
September1st to 10thDay
3312323346%72%
2160
11th to 20thDay
3322313236%71%
2039
21st to endDay
2312312346%71%
1980
October1st to 10thDay
431332235%5%69%
1980
11th to 20thDay
431222323472%
1846
21st to endDay
2313422445%70%
1966
November1st to 10thDay
3323423347%67%
1674
11th to 20thDay
5%32331245%5%67%
1710
21st to endDay
431432435%9%62%
1710
December1st to 10thDay
7%6%244235%5%7%56%
1710
11th to 20thDay
13%6%25%5%2445%7%46%
2169
21st to endDay
11%7%35%6%3445%7%44%
2954
January1st to 10thNight
9%5%1432446%8%54%
2646
11th to 20thNight
7%42332345%7%59%
2390
21st to endNight
9%5%23323336%61%
2376
February1st to 10thNight
7%5%25%323446%59%
2160
11th to 20thNight
7%5%24423345%59%
2098
21st to endNight
9%425%424435%57%
1776
March1st to 10thNight
8%6%345%3345%8%52%
2160
11th to 20thNight
8%6%35%43445%7%50%
2098
21st to endNight
5%6%2443445%8%55%
1980
April1st to 10thNight
8%6%35%42335%7%54%
1800
11th to 20thNight
5%6%23323237%63%
1779
21st to endNight
48%25%32445%7%56%
1800
May1st to 10thNight
5%6%2444445%7%54%
1772
11th to 20thNight
5%9%34424347%55%
1594
21st to endNight
48%23323238%62%
1746
June1st to 10thNight
49%46%43445%8%49%
1591
11th to 20thNight
37%3342445%8%56%
1440
21st to endNight
39%35%6%35%45%8%49%
1440
July1st to 10thNight
46%25%6%34249%55%
1440
11th to 20thNight
25%25%6%445%5%8%54%
1459
21st to endNight
46%35%6%45%45%9%50%
1970
August1st to 10thNight
342443445%10%56%
1790
11th to 20thNight
37%245%3346%10%54%
1780
21st to endNight
25%2443435%9%58%
1980
September1st to 10thNight
46%2442435%7%59%
1800
11th to 20thNight
3424433348%64%
1920
21st to endNight
25%25%322246%67%
1980
October1st to 10thNight
3424434336%64%
1980
11th to 20thNight
5%424423345%64%
2110
21st to endNight
3423223347%67%
2389
November1st to 10thNight
3424323348%63%
2405
11th to 20thNight
3424423347%64%
2470
21st to endNight
5%43443345%8%58%
2470
December1st to 10thNight
7%5%25%5%24446%55%
2470
11th to 20thNight
14%8%35%423447%45%
3041
21st to endNight
14%7%26%5%36%45%6%43%
4685

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
28%48%20%20%20%
1519
11th to 20thDay
25%48%13%23%27%
1653
21st to endDay
28%38%18%16%27%
1980
February1st to 10thDay
27%3415%26%25%
1800
11th to 20thDay
22%5%7%17%25%24%
1760
21st to endDay
24%5%9%21%24%18%
1480
March1st to 10thDay
27%6%10%19%18%20%
1800
11th to 20thDay
25%413%19%24%16%
1855
21st to endDay
22%5%12%24%22%15%
2376
April1st to 10thDay
23%6%13%26%21%12%
2160
11th to 20thDay
18%410%24%27%17%
2132
21st to endDay
18%411%25%29%13%
2160
May1st to 10thDay
23%5%12%22%25%13%
2186
11th to 20thDay
23%5%8%25%27%12%
2304
21st to endDay
23%6%10%29%26%6%
2530
June1st to 10thDay
26%5%11%19%27%12%
2362
11th to 20thDay
18%5%7%13%34%24%
2520
21st to endDay
20%46%11%28%32%
2520
July1st to 10thDay
19%46%13%22%37%
2451
11th to 20thDay
17%48%19%30%22%
2415
21st to endDay
16%5%10%22%31%14%
2220
August1st to 10thDay
14%35%16%30%32%
2135
11th to 20thDay
12%36%16%34%28%
2122
21st to endDay
13%37%14%34%29%
2376
September1st to 10thDay
15%37%12%31%32%
2160
11th to 20thDay
15%46%13%31%31%
2039
21st to endDay
15%45%16%33%28%
1980
October1st to 10thDay
19%37%21%22%28%
1980
11th to 20thDay
18%36%17%25%30%
1846
21st to endDay
16%5%6%15%20%38%
1966
November1st to 10thDay
18%49%18%22%31%
1674
11th to 20thDay
19%48%15%18%36%
1710
21st to endDay
22%310%13%24%28%
1710
December1st to 10thDay
28%5%6%17%20%23%
1710
11th to 20thDay
36%5%10%15%19%15%
2168
21st to endDay
38%7%11%18%14%12%
2954
January1st to 10thNight
28%49%16%23%19%
2646
11th to 20thNight
24%5%9%15%19%28%
2390
21st to endNight
26%48%17%16%29%
2376
February1st to 10thNight
28%36%13%23%26%
2160
11th to 20thNight
27%47%17%21%24%
2099
21st to endNight
29%5%8%15%23%21%
1776
March1st to 10thNight
30%5%9%19%19%18%
2160
11th to 20thNight
32%6%9%17%21%15%
2098
21st to endNight
26%6%11%22%22%13%
1980
April1st to 10thNight
30%6%11%24%17%12%
1800
11th to 20thNight
22%5%10%22%24%17%
1779
21st to endNight
27%6%11%22%22%11%
1800
May1st to 10thNight
28%6%12%22%20%11%
1772
11th to 20thNight
30%5%10%25%20%11%
1595
21st to endNight
22%6%12%28%24%7%
1746
June1st to 10thNight
32%8%14%17%21%9%
1591
11th to 20thNight
22%7%11%14%30%16%
1440
21st to endNight
31%5%8%11%22%23%
1440
July1st to 10thNight
24%47%13%23%30%
1400
11th to 20thNight
21%7%12%17%25%19%
1411
21st to endNight
25%6%12%23%22%12%
1860
August1st to 10thNight
20%5%8%13%29%24%
1780
11th to 20thNight
22%47%14%30%23%
1780
21st to endNight
21%6%6%14%29%25%
1980
September1st to 10thNight
22%5%6%10%29%28%
1800
11th to 20thNight
17%5%7%12%28%31%
1920
21st to endNight
18%35%16%32%26%
1980
October1st to 10thNight
20%46%18%23%28%
1980
11th to 20thNight
23%47%14%23%29%
2110
21st to endNight
18%46%12%22%38%
2389
November1st to 10thNight
20%47%17%20%32%
2405
11th to 20thNight
20%47%14%18%36%
2470
21st to endNight
25%5%8%16%19%28%
2470
December1st to 10thNight
29%47%14%19%26%
2470
11th to 20thNight
38%5%8%14%20%15%
3041
21st to endNight
35%11%10%19%14%12%
4685

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
13%418%41%20%4
180
11th to 20thDay
10%6%26%35%20%3
346
21st to endDay
9%8%28%33%18%4
462
February1st to 10thDay
10%5%29%30%19%7%
420
11th to 20thDay
8%12%31%29%17%4
415
21st to endDay
9%12%32%33%13%2
346
March1st to 10thDay
12%12%32%29%13%2
420
11th to 20thDay
10%11%29%30%16%4
420
21st to endDay
8%14%32%31%12%2
462
April1st to 10thDay
6%12%30%30%16%6%
420
11th to 20thDay
416%35%30%10%4
412
21st to endDay
411%32%32%15%5%
420
May1st to 10thDay
5%12%31%36%13%4
423
11th to 20thDay
5%8%27%42%15%4
448
21st to endDay
5%8%32%37%15%3
485
June1st to 10thDay
7%5%22%39%23%4
450
11th to 20thDay
4322%41%21%8%
450
21st to endDay
3316%44%26%7%
450
July1st to 10thDay
319%45%33%9%
446
11th to 20thDay
216%41%35%15%
444
21st to endDay
29%43%33%14%
487
August1st to 10thDay
2110%47%29%11%
447
11th to 20thDay
418%44%32%11%
437
21st to endDay
2112%42%32%11%
495
September1st to 10thDay
3218%41%26%10%
450
11th to 20thDay
4220%45%21%8%
450
21st to endDay
16%22%40%22%10%
450
October1st to 10thDay
46%23%36%24%6%
450
11th to 20thDay
4425%38%20%8%
450
21st to endDay
47%19%36%25%9%
481
November1st to 10thDay
5%6%12%34%31%11%
270
11th to 20thDay
5%316%36%30%10%
270
21st to endDay
4418%34%31%9%
270
December1st to 10thDay
8%316%40%27%6%
270
11th to 20thDay
6%5%15%39%25%10%
270
21st to endDay
12%10%20%33%23%3
243
January1st to 10thNight
11%312%40%27%7%
760
11th to 20thNight
8%212%40%30%7%
738
21st to endNight
11%315%39%27%5%
792
February1st to 10thNight
9%313%36%33%7%
720
11th to 20thNight
10%415%36%29%6%
704
21st to endNight
10%417%40%24%4
592
March1st to 10thNight
9%417%43%23%4
720
11th to 20thNight
10%313%37%29%8%
720
21st to endNight
8%5%16%38%29%5%
792
April1st to 10thNight
9%5%13%39%29%5%
720
11th to 20thNight
7%416%35%33%5%
711
21st to endNight
6%414%34%34%7%
720
May1st to 10thNight
8%213%36%34%7%
692
11th to 20thNight
5%216%33%37%7%
531
21st to endNight
4216%37%33%7%
584
June1st to 10thNight
5%213%34%38%8%
511
11th to 20thNight
5%16%21%53%15%
360
21st to endNight
6%25%24%51%12%
360
July1st to 10thNight
5%310%58%24%
350
11th to 20thNight
3127%53%33%
367
21st to endNight
5%1219%47%26%
788
August1st to 10thNight
5%420%48%22%
716
11th to 20thNight
7%1213%49%28%
712
21st to endNight
4315%53%25%
792
September1st to 10thNight
5%15%20%46%22%
720
11th to 20thNight
5%5%26%51%14%
720
21st to endNight
326%26%49%14%
720
October1st to 10thNight
5%16%34%46%8%
720
11th to 20thNight
7%26%31%42%12%
720
21st to endNight
429%32%39%15%
792
November1st to 10thNight
5%210%32%40%12%
740
11th to 20thNight
427%36%39%13%
760
21st to endNight
6%213%41%32%7%
760
December1st to 10thNight
9%311%42%30%6%
760
11th to 20thNight
13%313%39%27%5%
760
21st to endNight
10%5%15%42%22%6%
836
Page generated at 2024-01-12 04:31:50. Version ac07

Copyright 2024 Attilla Danko


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