Estrella Escondido
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Estrella Escondido clear sky chart from 2005-11-05 to 2017-12-04.

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
60%
15789
33%
47860
23%
15748
70%
15748
46%
24078

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
47%
718
31%
2327
19%
716
62%
716
43%
1156
January16th to endNight
48%
768
37%
2399
22%
768
65%
768
42%
1198
February1st to 15thNight
53%
702
35%
2112
22%
700
67%
700
51%
1001
February16th to endNight
38%
632
37%
1894
17%
632
57%
632
47%
923
March1st to 15thNight
50%
720
35%
2087
20%
720
62%
720
43%
1097
March16th to endNight
49%
681
38%
2025
20%
681
66%
681
51%
960
April1st to 15thNight
42%
539
35%
1798
17%
539
64%
539
44%
837
April16th to endNight
45%
540
40%
1800
24%
540
71%
540
56%
729
May1st to 15thNight
46%
539
30%
1799
21%
539
62%
539
47%
822
May16th to endNight
62%
562
30%
1781
25%
561
72%
561
49%
848
June1st to 15thNight
78%
540
28%
1527
26%
540
81%
540
55%
747
June16th to endNight
80%
540
27%
1441
24%
540
80%
540
48%
795
July1st to 15thNight
78%
510
23%
1530
23%
510
79%
510
42%
838
July16th to endNight
79%
564
23%
1696
25%
531
80%
531
38%
932
August1st to 15thNight
84%
539
25%
1789
31%
536
83%
536
37%
968
August16th to endNight
79%
573
21%
1910
25%
573
79%
573
31%
1116
September1st to 15thNight
74%
540
22%
1800
25%
540
74%
540
32%
1043
September16th to endNight
72%
537
32%
1955
33%
537
76%
537
36%
1003
October1st to 15thNight
67%
636
34%
2076
29%
636
73%
636
47%
996
October16th to endNight
72%
768
41%
2304
27%
768
79%
768
60%
1032
November1st to 15thNight
64%
825
39%
2345
24%
825
72%
825
59%
1086
November16th to endNight
59%
975
40%
2535
22%
975
69%
975
54%
1306
December1st to 15thNight
52%
920
36%
2392
19%
920
62%
920
48%
1314
December16th to endNight
42%
921
36%
2538
18%
921
56%
921
46%
1331

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
3213323447%61%
48599
Night
331332345%7%61%
48067
Cloud CoverDay
321332445%7%60%
48597
Night
331332345%7%61%
48067
TransparencyDay
21%48%17%25%21%
48306
Night
21%48%16%26%23%
47862
SeeingDay
5%8%21%31%25%8%
5531
Night
5%6%23%36%25%3
15795

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 15thDay
241332435%8%61%
1611
16th to endDay
6%313314446%60%
1821
February1st to 15thDay
2213322346%68%
1750
16th to endDay
2212322336%68%
1580
March1st to 15thDay
2313324447%62%
1870
16th to endDay
2212313237%68%
2199
April1st to 15thDay
2212312346%67%
2150
16th to endDay
111112235%79%
2160
May1st to 15thDay
2212313335%70%
2151
16th to endDay
3111223346%70%
2330
June1st to 15thDay
1111212348%70%
2430
16th to endDay
32133245%6%10%56%
2514
July1st to 15thDay
6%324425%6%7%9%47%
2340
16th to endDay
6%4245%35%5%7%11%43%
2353
August1st to 15thDay
4213327%7%8%11%46%
2160
16th to endDay
5%425%6%36%6%7%11%41%
2292
September1st to 15thDay
8%4245%245%5%8%47%
2160
16th to endDay
5%31442335%7%56%
2004
October1st to 15thDay
4213213336%66%
1881
16th to endDay
11231222375%
1920
November1st to 15thDay
2312212345%69%
1829
16th to endDay
4312213335%68%
1755
December1st to 15thDay
3214424348%60%
1650
16th to endDay
3423324447%58%
1689
January1st to 15thNight
2423323446%61%
2327
16th to endNight
6%313323335%63%
2399
February1st to 15thNight
221322335%7%65%
2102
16th to endNight
3313313346%66%
1894
March1st to 15thNight
3424323346%60%
2087
16th to endNight
3213213336%68%
2025
April1st to 15thNight
2213322446%64%
1798
16th to endNight
21121324475%
1800
May1st to 15thNight
3213212345%66%
1799
16th to endNight
211232335%5%66%
1780
June1st to 15thNight
221232447%7%63%
1527
16th to endNight
1213425%5%6%11%53%
1441
July1st to 15thNight
3324425%47%9%52%
1620
16th to endNight
4314425%47%12%48%
1813
August1st to 15thNight
32145%36%6%9%13%44%
1800
16th to endNight
3425%5%35%6%7%12%42%
1910
September1st to 15thNight
7%4245%346%6%9%46%
1800
16th to endNight
6%4134235%5%7%54%
1955
October1st to 15thNight
4312312347%63%
2076
16th to endNight
31122233473%
2304
November1st to 15thNight
212212247%71%
2345
16th to endNight
431321223469%
2535
December1st to 15thNight
4312323347%61%
2392
16th to endNight
3414423345%63%
2538

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
2413424347%61%
1611
16th to endDay
6%313324445%59%
1821
February1st to 15thDay
3213223346%66%
1750
16th to endDay
3312323335%67%
1580
March1st to 15thDay
221343445%7%60%
1870
16th to endDay
2213322247%68%
2197
April1st to 15thDay
2213213346%66%
2150
16th to endDay
111112135%79%
2160
May1st to 15thDay
2212313336%69%
2151
16th to endDay
3111213346%70%
2330
June1st to 15thDay
112212447%69%
2430
16th to endDay
2213325%5%7%10%54%
2514
July1st to 15thDay
5%324435%5%7%10%45%
2340
16th to endDay
6%3245%45%6%8%10%42%
2353
August1st to 15thDay
4213436%7%9%10%45%
2160
16th to endDay
4435%6%36%7%7%11%39%
2292
September1st to 15thDay
8%4245%35%5%6%9%45%
2160
16th to endDay
5%4135%2335%7%56%
2004
October1st to 15thDay
5%213223246%65%
1881
16th to endDay
1112312225%74%
1920
November1st to 15thDay
2312212436%68%
1829
16th to endDay
331221334468%
1755
December1st to 15thDay
3213415%448%59%
1650
16th to endDay
3434424446%58%
1689
January1st to 15thNight
2324424446%61%
2327
16th to endNight
6%313323335%63%
2399
February1st to 15thNight
2213323346%65%
2102
16th to endNight
3323312345%66%
1894
March1st to 15thNight
3424423346%60%
2087
16th to endNight
2213223346%68%
2025
April1st to 15thNight
2214323346%63%
1798
16th to endNight
111122324375%
1800
May1st to 15thNight
3213323445%67%
1799
16th to endNight
211332436%6%65%
1780
June1st to 15thNight
111322445%9%62%
1527
16th to endNight
1114435%5%7%11%53%
1441
July1st to 15thNight
2314325%5%7%10%51%
1620
16th to endNight
4214436%5%6%12%47%
1813
August1st to 15thNight
42135%35%6%8%14%43%
1800
16th to endNight
3425%6%36%6%8%12%42%
1910
September1st to 15thNight
6%425%5%25%6%7%8%45%
1800
16th to endNight
5%5%1342446%7%54%
1955
October1st to 15thNight
5%214312346%63%
2076
16th to endNight
31121233473%
2304
November1st to 15thNight
2212212347%70%
2345
16th to endNight
431332233468%
2535
December1st to 15thNight
5%313324447%61%
2392
16th to endNight
4324423345%62%
2538

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
23%38%18%29%17%
1612
16th to endDay
23%36%14%30%21%
1821
February1st to 15thDay
18%36%15%25%30%
1751
16th to endDay
18%2413%32%28%
1580
March1st to 15thDay
19%45%13%31%25%
1870
16th to endDay
17%25%12%30%32%
2199
April1st to 15thDay
17%3411%30%32%
2150
16th to endDay
10%249%29%44%
2160
May1st to 15thDay
16%35%12%25%37%
2151
16th to endDay
15%46%15%24%33%
2333
June1st to 15thDay
13%37%17%22%35%
2430
16th to endDay
21%6%11%17%21%21%
2514
July1st to 15thDay
28%7%13%22%19%8%
2201
16th to endDay
30%8%17%25%14%3
2207
August1st to 15thDay
25%10%18%25%17%3
2147
16th to endDay
34%10%13%22%15%4
2292
September1st to 15thDay
32%7%12%19%18%8%
2160
16th to endDay
26%5%7%16%29%13%
2004
October1st to 15thDay
19%39%17%27%22%
1881
16th to endDay
14%2316%32%30%
1920
November1st to 15thDay
16%45%20%29%22%
1829
16th to endDay
17%25%16%32%25%
1755
December1st to 15thDay
23%36%23%31%10%
1650
16th to endDay
24%37%23%28%11%
1689
January1st to 15thNight
23%36%15%31%19%
2327
16th to endNight
22%3415%33%20%
2399
February1st to 15thNight
18%37%13%24%33%
2112
16th to endNight
19%349%31%32%
1894
March1st to 15thNight
23%3413%26%28%
2087
16th to endNight
17%3412%27%34%
2025
April1st to 15thNight
19%36%8%32%29%
1798
16th to endNight
12%2312%25%43%
1800
May1st to 15thNight
18%35%11%23%36%
1800
16th to endNight
18%47%15%20%32%
1782
June1st to 15thNight
16%49%16%19%32%
1527
16th to endNight
21%6%12%20%18%21%
1441
July1st to 15thNight
24%7%15%25%19%8%
1530
16th to endNight
25%8%19%24%19%3
1696
August1st to 15thNight
25%8%16%25%19%3
1789
16th to endNight
31%8%16%23%14%5%
1910
September1st to 15thNight
31%8%15%19%14%11%
1800
16th to endNight
26%6%8%19%26%13%
1955
October1st to 15thNight
21%38%17%23%24%
2076
16th to endNight
13%35%15%25%35%
2304
November1st to 15thNight
14%25%18%34%24%
2345
16th to endNight
18%2312%32%29%
2535
December1st to 15thNight
22%45%20%30%16%
2392
16th to endNight
22%36%20%33%13%
2538

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
11%12%35%30%11%
90
16th to endDay
226%32%22%13%3
96
February1st to 15thDay
7%5%20%37%25%3
90
16th to endDay
7%17%25%30%11%7%
81
March1st to 15thDay
5%10%37%28%13%4
160
16th to endDay
424%30%27%10%2
288
April1st to 15thDay
5%21%38%26%5%1
269
16th to endDay
224%47%17%8%1
270
May1st to 15thDay
221%37%29%7%
288
16th to endDay
27%38%35%15%
417
June1st to 15thDay
2117%37%36%4
495
16th to endDay
5%112%34%37%8%
489
July1st to 15thDay
6%6%35%36%14%
305
16th to endDay
3431%35%23%
327
August1st to 15thDay
4324%42%24%
315
16th to endDay
6%7%29%38%16%
332
September1st to 15thDay
9%6%37%33%12%
315
16th to endDay
13%6%6%25%37%9%
159
October1st to 15thDay
12%217%25%28%13%
135
16th to endDay
4415%29%28%18%
144
November1st to 15thDay
11%7%21%33%17%8%
135
16th to endDay
8%13%21%32%17%5%
135
December1st to 15thDay
6%11%26%35%19%3
100
16th to endDay
10%15%38%29%6%
96
January1st to 15thNight
5%5%37%34%14%2
720
16th to endNight
5%12%30%36%14%1
768
February1st to 15thNight
48%30%37%17%1
704
16th to endNight
5%10%43%32%6%
632
March1st to 15thNight
411%28%40%13%1
720
16th to endNight
39%33%39%11%1
681
April1st to 15thNight
313%37%35%9%
539
16th to endNight
110%40%35%11%
540
May1st to 15thNight
48%37%40%8%
540
16th to endNight
3424%48%17%
563
June1st to 15thNight
1112%57%24%1
540
16th to endNight
217%51%34%1
540
July1st to 15thNight
5%5%36%49%3
510
16th to endNight
41426%56%7%
564
August1st to 15thNight
4117%65%10%
539
16th to endNight
5%222%58%10%
573
September1st to 15thNight
10%1430%43%8%
540
16th to endNight
10%18%37%37%5%
537
October1st to 15thNight
6%316%39%29%3
636
16th to endNight
3416%38%30%7%
768
November1st to 15thNight
35%22%36%28%4
825
16th to endNight
5%8%22%35%25%2
975
December1st to 15thNight
6%8%28%39%15%1
920
16th to endNight
5%11%36%32%13%1
921
Page generated at 2017-12-05 08:19:01. Version ac04

Copyright 2017 A. Danko


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