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 2017-09-21.

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%
16113
33%
46868
31%
16068
82%
16068
50%
23817

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%
720
30%
2160
34%
720
78%
720
45%
1137
March16th to endNight
78%
768
28%
2027
25%
768
79%
768
47%
1139
April1st to 15thNight
70%
719
27%
1799
18%
719
72%
719
44%
1078
April16th to endNight
78%
720
31%
1800
20%
720
79%
720
53%
991
May1st to 15thNight
81%
587
30%
1667
22%
587
82%
587
48%
904
May16th to endNight
78%
561
27%
1685
21%
561
79%
561
44%
909
June1st to 15thNight
86%
540
29%
1620
27%
540
86%
540
53%
796
June16th to endNight
96%
456
38%
1536
39%
456
96%
456
76%
552
July1st to 15thNight
93%
441
31%
1461
31%
441
93%
441
63%
595
July16th to endNight
90%
632
31%
1656
24%
594
90%
594
58%
805
August1st to 15thNight
94%
717
36%
1790
23%
713
94%
713
72%
854
August16th to endNight
95%
764
41%
1910
28%
764
95%
764
75%
890
September1st to 15thNight
90%
720
38%
1857
32%
720
90%
720
65%
907
September16th to endNight
88%
680
44%
1881
42%
680
89%
680
68%
839
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%
47957
Night
3213213346%66%
47074
TransparencyDay
19%36%16%27%27%
47659
Night
20%46%15%24%28%
46875
SeeingDay
45%19%37%24%8%
5941
Night
5%17%32%41%11%
16124

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
42124235%6%10%58%
1800
16th to endDay
221332445%8%60%
2193
April1st to 15thDay
5%22332435%7%58%
2149
16th to endDay
2312213337%68%
2160
May1st to 15thDay
231332335%8%64%
2282
16th to endDay
2423322347%63%
2429
June1st to 15thDay
3312222226%69%
2340
16th to endDay
111111484%
2412
July1st to 15thDay
1212212345%72%
2400
16th to endDay
1112213347%69%
2395
August1st to 15thDay
11233480%
2160
16th to endDay
1121133478%
2292
September1st to 15thDay
11111223478%
2101
16th to endDay
12111225%79%
1871
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%
2160
16th to endNight
3313324449%59%
2027
April1st to 15thNight
5%424314347%58%
1799
16th to endNight
3312213336%67%
1800
May1st to 15thNight
1212324348%65%
1667
16th to endNight
1313323348%63%
1684
June1st to 15thNight
1223212337%70%
1620
16th to endNight
1122386%
1536
July1st to 15thNight
11111325%7%74%
1550
16th to endNight
21211335%6%69%
1769
August1st to 15thNight
11111125%7%76%
1800
16th to endNight
11223481%
1910
September1st to 15thNight
1211111335%76%
1857
16th to endNight
11221112381%
1881
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%
1800
16th to endDay
21%411%23%21%15%
2193
April1st to 15thDay
26%47%24%26%12%
2149
16th to endDay
17%38%22%29%18%
2160
May1st to 15thDay
20%37%20%28%19%
2282
16th to endDay
20%36%25%31%11%
2432
June1st to 15thDay
19%26%16%31%24%
2340
16th to endDay
8%137%25%53%
2412
July1st to 15thDay
13%36%9%25%41%
2261
16th to endDay
14%28%21%28%23%
2246
August1st to 15thDay
8%3213%33%38%
2146
16th to endDay
9%2311%35%37%
2292
September1st to 15thDay
10%249%33%38%
2101
16th to endDay
10%2211%33%39%
1871
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%
2160
16th to endNight
23%6%10%20%22%16%
2027
April1st to 15thNight
28%48%23%21%13%
1799
16th to endNight
20%47%22%24%20%
1800
May1st to 15thNight
21%6%7%21%22%20%
1668
16th to endNight
23%6%9%24%23%13%
1685
June1st to 15thNight
18%47%14%32%23%
1620
16th to endNight
6%147%26%52%
1536
July1st to 15thNight
10%45%10%26%42%
1461
16th to endNight
15%47%20%29%21%
1656
August1st to 15thNight
9%3314%40%28%
1790
16th to endNight
8%25%10%31%41%
1910
September1st to 15thNight
13%35%8%30%38%
1857
16th to endNight
11%2111%32%40%
1881
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
412%26%31%17%7%
270
16th to endDay
310%34%31%13%6%
288
April1st to 15thDay
5%16%31%28%11%5%
269
16th to endDay
212%39%31%10%4
270
May1st to 15thDay
411%28%35%15%4
288
16th to endDay
37%24%43%15%5%
330
June1st to 15thDay
3123%38%23%8%
315
16th to endDay
111%40%31%15%
315
July1st to 15thDay
16%38%35%17%
305
16th to endDay
2331%44%17%
327
August1st to 15thDay
15%46%36%10%
315
16th to endDay
1238%40%15%
332
September1st to 15thDay
19%50%28%8%
315
16th to endDay
2114%45%26%9%
276
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%
720
16th to endNight
337%40%35%8%
768
April1st to 15thNight
6%410%41%31%4
719
16th to endNight
439%39%34%8%
720
May1st to 15thNight
3210%35%41%7%
588
16th to endNight
2112%36%41%5%
563
June1st to 15thNight
117%38%45%5%
540
16th to endNight
1126%64%6%
456
July1st to 15thNight
115%68%13%
441
16th to endNight
211%66%17%
632
August1st to 15thNight
1112%66%17%
717
16th to endNight
110%63%24%
764
September1st to 15thNight
2216%58%19%
720
16th to endNight
3424%52%15%
680
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 2017-09-22 04:35:35. Version ac04

Copyright 2017 A. Danko


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