Lake Elsinore
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Elsinore clear sky chart from 2005-11-05 to 2019-06-10.

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
80%
18466
33%
53783
31%
18421
82%
18421
49%
27491

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
71%
839
30%
2710
31%
836
75%
836
39%
1430
January16th to endNight
70%
896
33%
2688
31%
896
74%
896
40%
1467
February1st to 15thNight
73%
817
34%
2466
35%
817
76%
817
43%
1308
February16th to endNight
67%
736
29%
2207
31%
736
70%
736
35%
1293
March1st to 15thNight
75%
840
27%
2520
31%
840
76%
840
40%
1399
March16th to endNight
79%
896
28%
2365
24%
896
80%
896
47%
1320
April1st to 15thNight
70%
839
28%
2099
19%
839
72%
839
43%
1270
April16th to endNight
78%
832
29%
2080
19%
832
79%
832
51%
1160
May1st to 15thNight
79%
685
29%
1945
22%
685
79%
685
44%
1093
May16th to endNight
76%
657
25%
1973
20%
657
77%
657
42%
1097
June1st to 15thNight
87%
612
31%
1836
27%
612
87%
612
54%
901
June16th to endNight
95%
494
37%
1664
37%
494
95%
494
74%
609
July1st to 15thNight
93%
480
32%
1590
32%
480
93%
480
64%
642
July16th to endNight
90%
686
29%
1806
23%
648
90%
648
59%
870
August1st to 15thNight
94%
765
37%
1910
24%
761
94%
761
73%
906
August16th to endNight
95%
828
40%
2070
27%
828
95%
828
75%
970
September1st to 15thNight
90%
780
40%
2012
33%
780
90%
780
66%
980
September16th to endNight
90%
776
43%
2145
42%
776
90%
776
71%
939
October1st to 15thNight
84%
780
36%
2145
35%
780
84%
780
55%
1092
October16th to endNight
81%
832
38%
2515
40%
832
83%
832
52%
1206
November1st to 15thNight
85%
820
37%
2665
42%
820
87%
820
52%
1212
November16th to endNight
76%
840
34%
2730
38%
840
79%
840
44%
1354
December1st to 15thNight
73%
840
34%
2730
36%
840
75%
840
39%
1423
December16th to endNight
65%
896
33%
2912
32%
896
71%
896
38%
1550

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
3212323346%66%
54689
Night
3213323346%65%
53989
TransparencyDay
19%36%16%26%27%
54391
Night
21%46%15%24%27%
53790
SeeingDay
45%18%34%26%10%
8259
Night
5%17%32%41%11%
18477

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
6%424423436%57%
1884
16th to endDay
8%313323445%58%
2240
February1st to 15thDay
5%412324445%60%
2051
16th to endDay
7%5%25%424446%52%
1839
March1st to 15thDay
42134245%6%10%54%
2100
16th to endDay
221332446%8%59%
2558
April1st to 15thDay
422332445%7%58%
2509
16th to endDay
2213313346%67%
2485
May1st to 15thDay
241432435%8%59%
2664
16th to endDay
242332335%7%60%
2845
June1st to 15thDay
2312212236%70%
2653
16th to endDay
111112484%
2613
July1st to 15thDay
1212222345%71%
2600
16th to endDay
1112213347%70%
2597
August1st to 15thDay
11133481%
2293
16th to endDay
1121233478%
2484
September1st to 15thDay
11111223479%
2276
16th to endDay
12111235%80%
2145
October1st to 15thDay
3213222346%66%
2145
16th to endDay
3312212345%70%
2058
November1st to 15thDay
312322336%68%
1854
16th to endDay
3313323447%61%
1890
December1st to 15thDay
5%31342436%7%57%
1890
16th to endDay
7%423324347%56%
2016
January1st to 15thNight
5%423424347%56%
2710
16th to endNight
7%324323446%58%
2688
February1st to 15thNight
6%324222346%60%
2461
16th to endNight
8%41442435%5%54%
2207
March1st to 15thNight
44143235%5%9%54%
2520
16th to endNight
22133245%5%9%59%
2365
April1st to 15thNight
5%42441445%7%56%
2099
16th to endNight
2312323447%64%
2080
May1st to 15thNight
132342435%8%60%
1945
16th to endNight
131342435%9%60%
1972
June1st to 15thNight
1223212337%70%
1836
16th to endNight
1122484%
1664
July1st to 15thNight
11111225%7%74%
1679
16th to endNight
21211335%6%69%
1919
August1st to 15thNight
11111246%77%
1920
16th to endNight
111223481%
2070
September1st to 15thNight
1111111235%76%
2012
16th to endNight
11211112382%
2145
October1st to 15thNight
2212313346%67%
2145
16th to endNight
3213212335%69%
2515
November1st to 15thNight
1213322336%68%
2665
16th to endNight
421342345%8%59%
2730
December1st to 15thNight
6%423324348%57%
2730
16th to endNight
7%313324346%58%
2912

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
28%4412%24%24%
1885
16th to endDay
27%47%14%19%28%
2240
February1st to 15thDay
25%4413%25%26%
2051
16th to endDay
33%36%16%26%12%
1839
March1st to 15thDay
24%6%7%20%20%20%
2100
16th to endDay
22%5%11%22%23%15%
2558
April1st to 15thDay
25%5%8%23%24%12%
2509
16th to endDay
18%37%22%30%16%
2485
May1st to 15thDay
24%47%19%26%17%
2664
16th to endDay
23%47%25%29%10%
2848
June1st to 15thDay
18%26%17%31%24%
2653
16th to endDay
8%137%26%52%
2613
July1st to 15thDay
13%36%10%25%40%
2461
16th to endDay
13%39%22%28%21%
2448
August1st to 15thDay
8%2213%33%39%
2279
16th to endDay
9%2313%35%34%
2484
September1st to 15thDay
10%249%34%39%
2276
16th to endDay
9%2211%34%39%
2145
October1st to 15thDay
18%3416%27%28%
2145
16th to endDay
17%4311%23%40%
2058
November1st to 15thDay
18%27%14%22%33%
1854
16th to endDay
22%46%14%21%31%
1890
December1st to 15thDay
24%5%8%17%17%26%
1890
16th to endDay
29%46%16%21%21%
2016
January1st to 15thNight
27%46%13%20%27%
2710
16th to endNight
27%47%13%15%30%
2688
February1st to 15thNight
25%36%16%22%25%
2472
16th to endNight
32%5%5%15%26%15%
2207
March1st to 15thNight
26%7%8%19%19%19%
2520
16th to endNight
22%6%10%21%22%15%
2365
April1st to 15thNight
28%5%9%22%21%13%
2099
16th to endNight
21%48%20%25%18%
2080
May1st to 15thNight
24%6%8%21%21%18%
1946
16th to endNight
24%7%10%24%22%11%
1973
June1st to 15thNight
17%48%13%31%23%
1836
16th to endNight
7%15%7%26%50%
1664
July1st to 15thNight
10%45%11%26%41%
1590
16th to endNight
14%49%21%29%19%
1806
August1st to 15thNight
9%3414%39%29%
1910
16th to endNight
8%25%12%32%37%
2070
September1st to 15thNight
13%35%8%30%39%
2012
16th to endNight
10%2211%33%40%
2145
October1st to 15thNight
19%35%17%29%23%
2145
16th to endNight
18%439%21%42%
2515
November1st to 15thNight
17%35%15%22%35%
2665
16th to endNight
23%36%14%20%31%
2730
December1st to 15thNight
26%46%16%19%26%
2730
16th to endNight
27%48%12%25%21%
2912

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
16%212%33%27%7%
183
16th to endDay
9%6%25%32%20%5%
416
February1st to 15thDay
7%7%24%30%19%9%
386
16th to endDay
10%14%25%29%17%2
342
March1st to 15thDay
5%12%27%34%15%5%
390
16th to endDay
38%30%34%17%5%
416
April1st to 15thDay
413%29%29%17%5%
389
16th to endDay
210%36%31%11%7%
378
May1st to 15thDay
7%9%26%34%17%5%
408
16th to endDay
6%8%26%39%15%4
458
June1st to 15thDay
3119%35%28%11%
412
16th to endDay
19%35%33%19%
375
July1st to 15thDay
215%34%35%21%
365
16th to endDay
2228%44%21%
391
August1st to 15thDay
1441%37%14%
359
16th to endDay
1135%41%19%
396
September1st to 15thDay
19%46%30%11%
375
16th to endDay
1113%41%30%10%
375
October1st to 15thDay
5%420%38%25%5%
375
16th to endDay
4117%31%28%15%
338
November1st to 15thDay
1110%36%35%15%
180
16th to endDay
5%5%12%32%30%13%
180
December1st to 15thDay
5%211%33%36%10%
180
16th to endDay
6%5%17%27%32%10%
192
January1st to 15thNight
7%210%41%29%9%
840
16th to endNight
9%210%38%31%7%
896
February1st to 15thNight
7%28%40%30%10%
824
16th to endNight
10%212%40%26%6%
736
March1st to 15thNight
6%29%46%27%7%
840
16th to endNight
337%42%34%7%
896
April1st to 15thNight
6%410%41%33%4
839
16th to endNight
4310%39%34%8%
832
May1st to 15thNight
3210%33%41%7%
686
16th to endNight
3113%37%38%4
659
June1st to 15thNight
116%36%46%7%
612
16th to endNight
1125%63%7%
494
July1st to 15thNight
114%68%14%
480
16th to endNight
210%66%18%
686
August1st to 15thNight
1111%66%18%
765
16th to endNight
110%63%24%
828
September1st to 15thNight
2216%58%19%
780
16th to endNight
2325%53%14%
776
October1st to 15thNight
45%38%41%9%
780
16th to endNight
5%16%26%42%17%
832
November1st to 15thNight
31438%38%13%
820
16th to endNight
6%17%32%38%13%
840
December1st to 15thNight
8%28%40%31%8%
840
16th to endNight
10%312%38%26%8%
896
Page generated at 2019-06-10 16:29:45. Version ac04

Copyright 2019 A. Danko


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