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 2017-03-14.

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%
15450
33%
45049
31%
15405
81%
15405
50%
22922

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
72%
719
30%
2321
31%
716
76%
716
41%
1193
January16th to endNight
69%
768
33%
2304
31%
768
73%
768
39%
1276
February1st to 15thNight
74%
697
34%
2106
34%
697
77%
697
45%
1097
February16th to endNight
67%
632
28%
1895
31%
632
68%
632
33%
1136
March1st to 15thNight
76%
716
30%
2148
34%
716
78%
716
45%
1130
March16th to endNight
78%
704
27%
1858
24%
704
79%
704
47%
1043
April1st to 15thNight
68%
659
27%
1649
19%
659
70%
659
42%
1008
April16th to endNight
78%
660
28%
1650
18%
660
79%
660
51%
923
May1st to 15thNight
81%
538
31%
1528
23%
538
82%
538
48%
825
May16th to endNight
78%
513
25%
1541
20%
513
79%
513
44%
833
June1st to 15thNight
86%
495
31%
1485
28%
495
87%
495
54%
724
June16th to endNight
95%
418
36%
1408
36%
418
95%
418
75%
510
July1st to 15thNight
93%
402
32%
1332
32%
402
93%
402
62%
549
July16th to endNight
89%
584
29%
1524
23%
546
89%
546
58%
740
August1st to 15thNight
94%
657
38%
1640
25%
653
94%
653
73%
777
August16th to endNight
95%
700
39%
1750
27%
700
95%
700
75%
820
September1st to 15thNight
90%
660
40%
1702
33%
660
91%
660
66%
826
September16th to endNight
90%
656
45%
1815
43%
656
91%
656
71%
793
October1st to 15thNight
84%
660
37%
1815
36%
660
84%
660
56%
912
October16th to endNight
80%
704
38%
2127
39%
704
82%
704
50%
1038
November1st to 15thNight
85%
700
36%
2275
40%
700
87%
700
53%
1025
November16th to endNight
75%
720
35%
2340
38%
720
78%
720
45%
1146
December1st to 15thNight
72%
720
33%
2340
34%
720
75%
720
38%
1238
December16th to endNight
63%
768
32%
2496
31%
768
69%
768
36%
1360

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
3212213346%67%
45623
Night
3213213346%66%
45255
TransparencyDay
19%36%16%26%27%
45325
Night
21%46%15%24%28%
45056
SeeingDay
46%20%38%23%6%
5186
Night
5%17%32%41%11%
15461

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
5%423413436%59%
1614
16th to endDay
8%41332345%5%58%
1920
February1st to 15thDay
5%322324445%61%
1751
16th to endDay
7%5%25%5%23346%51%
1579
March1st to 15thDay
42123235%6%10%58%
1783
16th to endDay
321332445%8%59%
2010
April1st to 15thDay
5%22432435%7%56%
1969
16th to endDay
2313213337%67%
1980
May1st to 15thDay
231331335%8%64%
2091
16th to endDay
2423312347%64%
2221
June1st to 15thDay
3312212326%69%
2145
16th to endDay
111112483%
2211
July1st to 15thDay
1212212345%72%
2200
16th to endDay
1112213347%70%
2219
August1st to 15thDay
11233480%
1980
16th to endDay
1121233478%
2100
September1st to 15thDay
11111222479%
1926
16th to endDay
1211112480%
1815
October1st to 15thDay
3213222347%66%
1815
16th to endDay
333212335%68%
1742
November1st to 15thDay
312322345%69%
1584
16th to endDay
4313313347%63%
1620
December1st to 15thDay
5%31342435%8%56%
1620
16th to endDay
8%424324247%55%
1728
January1st to 15thNight
5%423414346%60%
2321
16th to endNight
8%324323445%57%
2304
February1st to 15thNight
5%32422235%5%62%
2101
16th to endNight
10%41443435%5%52%
1895
March1st to 15thNight
431332245%9%59%
2148
16th to endNight
3313324449%59%
1858
April1st to 15thNight
6%5%24324346%56%
1649
16th to endNight
3313223436%66%
1650
May1st to 15thNight
1212324348%65%
1528
16th to endNight
1313323249%64%
1540
June1st to 15thNight
1222212336%71%
1485
16th to endNight
1122385%
1408
July1st to 15thNight
11111225%7%73%
1421
16th to endNight
22211335%6%69%
1637
August1st to 15thNight
1111125%6%77%
1650
16th to endNight
11223482%
1750
September1st to 15thNight
111111133477%
1702
16th to endNight
1111112283%
1815
October1st to 15thNight
2212312235%71%
1815
16th to endNight
3213212345%68%
2127
November1st to 15thNight
1213222326%70%
2275
16th to endNight
4313412348%62%
2340
December1st to 15thNight
6%423424347%56%
2340
16th to endNight
9%313314345%58%
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
26%45%12%25%26%
1615
16th to endDay
27%47%13%18%28%
1920
February1st to 15thDay
24%45%13%25%26%
1751
16th to endDay
34%36%16%27%11%
1579
March1st to 15thDay
21%5%7%21%21%22%
1783
16th to endDay
22%411%24%20%16%
2010
April1st to 15thDay
27%47%24%23%12%
1969
16th to endDay
18%37%22%29%17%
1980
May1st to 15thDay
20%37%20%28%20%
2091
16th to endDay
20%36%26%32%10%
2224
June1st to 15thDay
19%26%15%31%24%
2145
16th to endDay
8%148%27%50%
2211
July1st to 15thDay
13%35%10%25%41%
2061
16th to endDay
14%28%21%28%24%
2070
August1st to 15thDay
8%3214%34%37%
1966
16th to endDay
9%3312%34%36%
2100
September1st to 15thDay
10%138%33%41%
1926
16th to endDay
9%2111%34%40%
1815
October1st to 15thDay
18%3417%28%27%
1815
16th to endDay
19%4311%21%39%
1742
November1st to 15thDay
17%27%15%23%33%
1584
16th to endDay
21%45%13%21%33%
1620
December1st to 15thDay
25%5%8%17%17%25%
1620
16th to endDay
30%47%16%21%20%
1728
January1st to 15thNight
25%45%12%21%29%
2321
16th to endNight
29%48%12%15%30%
2304
February1st to 15thNight
25%36%16%21%26%
2112
16th to endNight
34%5%5%13%25%15%
1895
March1st to 15thNight
23%5%7%20%20%22%
2148
16th to endNight
23%6%10%21%21%16%
1858
April1st to 15thNight
30%48%23%19%14%
1649
16th to endNight
22%47%20%24%20%
1650
May1st to 15thNight
21%6%7%20%22%21%
1529
16th to endNight
23%6%9%25%24%11%
1541
June1st to 15thNight
17%46%14%33%23%
1485
16th to endNight
7%15%8%28%48%
1408
July1st to 15thNight
10%46%10%26%41%
1332
16th to endNight
16%37%21%28%22%
1524
August1st to 15thNight
9%3315%40%27%
1640
16th to endNight
8%2411%32%40%
1750
September1st to 15thNight
13%247%30%41%
1702
16th to endNight
10%2112%32%41%
1815
October1st to 15thNight
17%4417%31%23%
1815
16th to endNight
19%4310%22%39%
2127
November1st to 15thNight
17%3415%22%36%
2275
16th to endNight
22%35%14%19%34%
2340
December1st to 15thNight
27%5%6%15%20%25%
2340
16th to endNight
29%5%8%13%23%20%
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
16%413%46%18%1
93
16th to endDay
10%8%28%35%15%1
288
February1st to 15thDay
5%7%28%32%22%4
266
16th to endDay
10%16%26%30%13%2
238
March1st to 15thDay
413%26%32%17%6%
264
16th to endDay
411%36%33%11%4
224
April1st to 15thDay
7%19%34%28%7%3
209
16th to endDay
313%40%32%7%2
210
May1st to 15thDay
5%11%29%35%14%2
228
16th to endDay
48%27%42%13%3
266
June1st to 15thDay
3225%43%20%4
255
16th to endDay
113%43%29%10%
255
July1st to 15thDay
117%44%35%9%
245
16th to endDay
2335%43%14%
271
August1st to 15thDay
16%50%34%7%
255
16th to endDay
1141%41%14%
268
September1st to 15thDay
110%51%28%7%
255
16th to endDay
1116%46%24%9%
255
October1st to 15thDay
45%21%42%22%3
255
16th to endDay
6%221%32%27%10%
220
November1st to 15thDay
310%31%30%25%
90
16th to endDay
47%16%33%32%5%
90
December1st to 15thDay
3411%33%41%6%
90
16th to endDay
8%7%20%33%29%1
96
January1st to 15thNight
6%210%40%28%10%
720
16th to endNight
9%210%38%29%8%
768
February1st to 15thNight
7%29%40%31%9%
704
16th to endNight
11%311%40%25%7%
632
March1st to 15thNight
6%29%44%29%8%
716
16th to endNight
337%40%34%9%
704
April1st to 15thNight
6%5%11%41%30%4
659
16th to endNight
5%38%38%34%8%
660
May1st to 15thNight
3210%36%40%7%
539
16th to endNight
2112%36%41%5%
515
June1st to 15thNight
116%40%44%5%
495
16th to endNight
1126%64%5%
418
July1st to 15thNight
115%68%12%
402
16th to endNight
3111%66%17%
584
August1st to 15thNight
1112%66%17%
657
16th to endNight
19%64%24%
700
September1st to 15thNight
1215%58%20%
660
16th to endNight
2424%52%15%
656
October1st to 15thNight
35%38%40%10%
660
16th to endNight
5%17%26%40%18%
704
November1st to 15thNight
315%35%39%15%
700
16th to endNight
6%18%32%36%13%
720
December1st to 15thNight
8%28%39%31%9%
720
16th to endNight
12%313%37%25%8%
768
Page generated at 2017-03-15 08:32:41. Version ac04

Copyright 2017 A. Danko


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