Temecula
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Temecula clear sky chart from 2005-11-05 to 2018-02-14.

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
78%
16837
33%
48823
30%
16794
80%
16794
50%
25031

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%
777
30%
2520
31%
776
75%
776
40%
1322
January16th to endNight
67%
832
33%
2496
31%
832
72%
832
40%
1372
February1st to 15thNight
73%
753
33%
2274
35%
753
76%
753
45%
1188
February16th to endNight
64%
632
27%
1895
31%
632
65%
632
31%
1164
March1st to 15thNight
73%
720
29%
2160
34%
720
75%
720
43%
1166
March16th to endNight
76%
768
28%
2031
26%
768
77%
768
47%
1136
April1st to 15thNight
68%
719
25%
1799
18%
719
69%
719
43%
1087
April16th to endNight
75%
720
30%
1800
20%
720
75%
720
51%
1010
May1st to 15thNight
75%
581
29%
1661
22%
581
76%
581
45%
923
May16th to endNight
74%
561
27%
1685
23%
561
74%
561
44%
914
June1st to 15thNight
83%
540
30%
1620
26%
540
83%
540
55%
787
June16th to endNight
95%
540
37%
1620
34%
540
95%
540
80%
629
July1st to 15thNight
91%
510
28%
1530
24%
510
91%
510
63%
687
July16th to endNight
89%
627
31%
1651
23%
589
89%
589
56%
809
August1st to 15thNight
91%
717
35%
1790
22%
713
91%
713
70%
862
August16th to endNight
92%
764
41%
1910
28%
764
92%
764
73%
902
September1st to 15thNight
87%
720
37%
1866
31%
720
88%
720
66%
907
September16th to endNight
88%
716
46%
1980
45%
716
89%
716
72%
862
October1st to 15thNight
83%
720
36%
1980
34%
720
84%
720
57%
996
October16th to endNight
79%
768
39%
2311
41%
768
81%
768
52%
1118
November1st to 15thNight
82%
760
33%
2470
37%
760
84%
760
49%
1165
November16th to endNight
76%
780
35%
2535
39%
780
79%
780
44%
1262
December1st to 15thNight
72%
780
32%
2535
35%
780
74%
780
41%
1308
December16th to endNight
67%
832
33%
2704
34%
832
71%
832
38%
1455

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
4312212336%67%
49238
Night
4313313346%65%
49030
TransparencyDay
19%36%16%26%27%
48939
Night
22%36%15%25%27%
48830
SeeingDay
5%6%22%38%19%6%
6436
Night
6%17%32%40%10%
16850

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
7%424313335%60%
1746
16th to endDay
9%412223436%59%
2080
February1st to 15thDay
6%312313345%62%
1883
16th to endDay
10%5%2442335%6%51%
1579
March1st to 15thDay
5%213313449%61%
1800
16th to endDay
4213323348%61%
2188
April1st to 15thDay
6%314323446%58%
2149
16th to endDay
3212212236%69%
2160
May1st to 15thDay
2414111347%65%
2287
16th to endDay
2413313236%66%
2429
June1st to 15thDay
3412212325%71%
2340
16th to endDay
111122385%
2340
July1st to 15thDay
2112212336%70%
2340
16th to endDay
2112213348%68%
2402
August1st to 15thDay
1111123479%
2160
16th to endDay
1121223478%
2292
September1st to 15thDay
11221232478%
2094
16th to endDay
1211122381%
1980
October1st to 15thDay
3213312245%69%
1980
16th to endDay
331221322470%
1908
November1st to 15thDay
3212323445%67%
1719
16th to endDay
5%313212347%63%
1755
December1st to 15thDay
5%31232435%9%58%
1755
16th to endDay
10%413322335%58%
1872
January1st to 15thNight
6%413323446%59%
2520
16th to endNight
7%5%14423236%58%
2496
February1st to 15thNight
6%323313335%63%
2269
16th to endNight
11%5%34423436%50%
1895
March1st to 15thNight
6%313323448%59%
2160
16th to endNight
5%413223449%58%
2031
April1st to 15thNight
7%6%34222348%54%
1799
16th to endNight
4423323235%65%
1800
May1st to 15thNight
26%14313247%61%
1661
16th to endNight
36%23313346%60%
1684
June1st to 15thNight
1312313336%67%
1620
16th to endNight
11123384%
1620
July1st to 15thNight
112312346%71%
1620
16th to endNight
21231245%7%67%
1764
August1st to 15thNight
1111221347%72%
1800
16th to endNight
1111224378%
1910
September1st to 15thNight
132212235%73%
1866
16th to endNight
221112381%
1980
October1st to 15thNight
2213323345%68%
1980
16th to endNight
331222333468%
2311
November1st to 15thNight
2312213336%68%
2470
16th to endNight
4313324346%62%
2535
December1st to 15thNight
7%324323346%58%
2535
16th to endNight
9%413312336%59%
2704

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%25%13%26%23%
1747
16th to endDay
27%37%14%18%28%
2080
February1st to 15thDay
25%4412%24%28%
1883
16th to endDay
36%46%15%24%12%
1579
March1st to 15thDay
22%47%20%23%21%
1800
16th to endDay
23%410%24%22%14%
2188
April1st to 15thDay
27%47%24%24%11%
2149
16th to endDay
18%39%22%29%17%
2160
May1st to 15thDay
21%37%21%26%18%
2287
16th to endDay
20%37%25%32%11%
2432
June1st to 15thDay
19%1416%33%24%
2340
16th to endDay
7%136%27%54%
2340
July1st to 15thDay
13%35%11%26%40%
2201
16th to endDay
15%48%21%29%21%
2252
August1st to 15thDay
9%2214%33%37%
2146
16th to endDay
10%2410%35%36%
2292
September1st to 15thDay
12%239%35%37%
2094
16th to endDay
10%2111%35%39%
1980
October1st to 15thDay
19%2416%27%29%
1980
16th to endDay
19%25%10%20%41%
1908
November1st to 15thDay
21%27%15%21%31%
1719
16th to endDay
23%3413%21%33%
1755
December1st to 15thDay
24%310%14%17%29%
1755
16th to endDay
31%37%14%23%19%
1872
January1st to 15thNight
26%45%12%22%28%
2520
16th to endNight
29%27%12%16%30%
2496
February1st to 15thNight
24%36%15%21%28%
2280
16th to endNight
38%3414%23%15%
1895
March1st to 15thNight
26%37%20%20%21%
2160
16th to endNight
25%410%21%22%16%
2031
April1st to 15thNight
30%49%22%20%13%
1799
16th to endNight
23%37%23%22%19%
1800
May1st to 15thNight
26%48%20%20%19%
1662
16th to endNight
26%49%24%23%12%
1685
June1st to 15thNight
18%28%17%33%18%
1620
16th to endNight
6%138%31%48%
1620
July1st to 15thNight
13%25%11%30%36%
1530
16th to endNight
15%5%8%22%31%16%
1651
August1st to 15thNight
12%1219%39%24%
1790
16th to endNight
9%2411%36%35%
1910
September1st to 15thNight
14%15%10%33%34%
1866
16th to endNight
10%1310%35%38%
1980
October1st to 15thNight
18%25%17%29%25%
1980
16th to endNight
20%2410%20%40%
2311
November1st to 15thNight
19%45%16%20%33%
2470
16th to endNight
23%36%13%18%33%
2535
December1st to 15thNight
25%47%15%18%28%
2535
16th to endNight
28%48%11%24%22%
2704

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
26%211%31%22%4
135
16th to endDay
11%8%25%31%17%5%
352
February1st to 15thDay
6%7%24%34%19%7%
320
16th to endDay
13%13%31%31%9%1
238
March1st to 15thDay
7%11%25%33%16%5%
270
16th to endDay
6%13%33%28%14%4
288
April1st to 15thDay
7%15%34%28%9%4
269
16th to endDay
117%37%32%8%3
270
May1st to 15thDay
7%9%35%33%10%3
288
16th to endDay
5%10%29%37%15%2
330
June1st to 15thDay
3329%37%20%5%
315
16th to endDay
115%43%28%9%
315
July1st to 15thDay
29%49%28%9%
305
16th to endDay
36%48%30%10%
327
August1st to 15thDay
113%53%23%7%
315
16th to endDay
216%53%23%11%
332
September1st to 15thDay
3122%50%17%4
315
16th to endDay
2427%42%16%5%
315
October1st to 15thDay
37%27%39%18%2
315
16th to endDay
6%225%35%19%11%
273
November1st to 15thDay
3412%35%31%12%
135
16th to endDay
45%14%36%31%7%
135
December1st to 15thDay
2217%37%34%5%
135
16th to endDay
11%118%28%34%5%
144
January1st to 15thNight
8%210%41%27%8%
780
16th to endNight
11%112%37%29%7%
832
February1st to 15thNight
7%210%37%32%9%
760
16th to endNight
13%311%40%24%6%
632
March1st to 15thNight
8%29%42%31%5%
720
16th to endNight
7%27%39%34%8%
768
April1st to 15thNight
9%312%39%29%5%
719
16th to endNight
5%49%38%34%8%
720
May1st to 15thNight
5%19%36%37%8%
582
16th to endNight
4112%35%41%4
563
June1st to 15thNight
218%37%45%4
540
16th to endNight
1231%57%6%
540
July1st to 15thNight
20%66%11%
510
16th to endNight
2112%64%18%
627
August1st to 15thNight
115%65%16%
717
16th to endNight
1110%62%24%
764
September1st to 15thNight
2218%59%17%
720
16th to endNight
3328%48%15%
716
October1st to 15thNight
37%36%40%10%
720
16th to endNight
7%7%28%37%18%
768
November1st to 15thNight
46%39%35%12%
760
16th to endNight
6%18%34%35%13%
780
December1st to 15thNight
9%110%39%31%8%
780
16th to endNight
12%111%40%25%7%
832
Page generated at 2018-02-15 07:58:42. Version ac04

Copyright 2018 A. Danko


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