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 2017-04-28.

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%
15758
33%
45647
30%
15715
80%
15715
49%
23486

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%
717
30%
2325
31%
716
75%
716
42%
1202
January16th to endNight
65%
768
32%
2304
29%
768
71%
768
38%
1288
February1st to 15thNight
73%
697
33%
2106
34%
697
76%
697
44%
1108
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%
712
30%
1780
20%
712
75%
712
51%
1002
May1st to 15thNight
75%
533
30%
1523
22%
533
76%
533
46%
840
May16th to endNight
73%
513
25%
1541
21%
513
74%
513
43%
841
June1st to 15thNight
83%
495
31%
1485
28%
495
84%
495
56%
714
June16th to endNight
94%
495
34%
1485
32%
495
94%
495
78%
583
July1st to 15thNight
91%
465
30%
1395
26%
465
91%
465
62%
634
July16th to endNight
89%
579
30%
1519
23%
541
89%
541
57%
740
August1st to 15thNight
91%
657
37%
1640
24%
653
91%
653
70%
790
August16th to endNight
93%
700
39%
1750
27%
700
93%
700
74%
822
September1st to 15thNight
89%
660
39%
1710
33%
660
89%
660
68%
823
September16th to endNight
89%
656
46%
1815
44%
656
90%
656
74%
779
October1st to 15thNight
83%
660
37%
1815
35%
660
84%
660
55%
923
October16th to endNight
79%
704
37%
2118
39%
704
81%
704
52%
1028
November1st to 15thNight
83%
700
34%
2275
39%
700
84%
700
51%
1049
November16th to endNight
76%
720
33%
2340
37%
720
78%
720
44%
1167
December1st to 15thNight
71%
720
32%
2340
35%
720
73%
720
39%
1236
December16th to endNight
65%
768
32%
2496
32%
768
69%
768
36%
1364

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%
46033
Night
4313313346%65%
45854
TransparencyDay
20%36%16%26%27%
45734
Night
22%36%16%24%26%
45654
SeeingDay
6%7%24%40%17%4
5356
Night
6%17%33%40%10%
15771

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%414313345%61%
1611
16th to endDay
9%412223436%58%
1920
February1st to 15thDay
6%313313345%61%
1751
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
3312212236%69%
2127
May1st to 15thDay
2414111347%66%
2095
16th to endDay
2413212236%67%
2221
June1st to 15thDay
3412212325%71%
2145
16th to endDay
111122384%
2145
July1st to 15thDay
2212212336%71%
2145
16th to endDay
211221335%8%69%
2226
August1st to 15thDay
11111123479%
1980
16th to endDay
1121223478%
2100
September1st to 15thDay
11211222479%
1920
16th to endDay
1211122381%
1815
October1st to 15thDay
4313312246%67%
1815
16th to endDay
3312213225%70%
1749
November1st to 15thDay
321221233470%
1584
16th to endDay
5%312212347%64%
1620
December1st to 15thDay
5%3124243410%56%
1620
16th to endDay
11%413322335%57%
1728
January1st to 15thNight
6%412323446%61%
2325
16th to endNight
8%5%14423236%56%
2304
February1st to 15thNight
6%323313335%63%
2101
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%64%
1780
May1st to 15thNight
26%13313247%61%
1523
16th to endNight
36%24313346%60%
1540
June1st to 15thNight
1312313236%69%
1485
16th to endNight
11123383%
1485
July1st to 15thNight
212222346%70%
1485
16th to endNight
212212447%68%
1632
August1st to 15thNight
111221347%72%
1650
16th to endNight
1111224379%
1750
September1st to 15thNight
132212235%74%
1710
16th to endNight
1211111382%
1815
October1st to 15thNight
2213223345%68%
1815
16th to endNight
431222333467%
2118
November1st to 15thNight
2212213335%70%
2275
16th to endNight
4313323336%62%
2340
December1st to 15thNight
7%324324346%57%
2340
16th to endNight
10%413312335%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
27%26%12%26%25%
1612
16th to endDay
28%47%13%17%28%
1920
February1st to 15thDay
26%4413%24%26%
1751
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%23%29%16%
2127
May1st to 15thDay
20%37%22%26%19%
2095
16th to endDay
19%37%26%33%10%
2224
June1st to 15thDay
19%1415%33%24%
2145
16th to endDay
8%136%28%51%
2145
July1st to 15thDay
13%35%11%25%40%
2006
16th to endDay
14%48%21%28%21%
2076
August1st to 15thDay
9%2214%33%36%
1966
16th to endDay
10%3410%35%35%
2100
September1st to 15thDay
11%238%35%39%
1920
16th to endDay
10%2110%34%39%
1815
October1st to 15thDay
20%25%17%26%27%
1815
16th to endDay
19%26%10%20%40%
1749
November1st to 15thDay
18%17%15%22%33%
1584
16th to endDay
22%3414%20%34%
1620
December1st to 15thDay
26%410%14%17%26%
1620
16th to endDay
32%37%15%23%18%
1728
January1st to 15thNight
25%35%12%22%30%
2325
16th to endNight
31%28%11%15%30%
2304
February1st to 15thNight
25%36%16%20%27%
2112
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%18%
1780
May1st to 15thNight
25%48%20%20%20%
1524
16th to endNight
26%49%24%24%11%
1541
June1st to 15thNight
18%28%17%34%18%
1485
16th to endNight
7%149%33%45%
1485
July1st to 15thNight
14%35%11%28%36%
1395
16th to endNight
15%5%8%23%30%17%
1519
August1st to 15thNight
12%1219%40%23%
1640
16th to endNight
9%2411%36%34%
1750
September1st to 15thNight
13%15%9%33%36%
1710
16th to endNight
9%1211%35%39%
1815
October1st to 15thNight
19%35%18%29%23%
1815
16th to endNight
21%2411%21%38%
2118
November1st to 15thNight
18%35%15%21%35%
2275
16th to endNight
23%46%14%17%33%
2340
December1st to 15thNight
27%47%15%18%25%
2340
16th to endNight
30%48%12%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
30%312%37%16%
90
16th to endDay
13%9%28%34%13%1
288
February1st to 15thDay
8%8%25%36%17%3
266
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
116%37%32%7%3
259
May1st to 15thDay
7%11%35%35%8%1
228
16th to endDay
6%11%30%38%12%1
266
June1st to 15thDay
4331%41%16%2
255
16th to endDay
2118%47%23%7%
255
July1st to 15thDay
211%56%24%5%
245
16th to endDay
37%52%26%8%
271
August1st to 15thDay
215%55%20%5%
255
16th to endDay
116%57%21%10%
268
September1st to 15thDay
2122%52%15%4
255
16th to endDay
1327%46%14%5%
255
October1st to 15thDay
49%30%39%14%1
255
16th to endDay
7%327%37%20%4
214
November1st to 15thDay
16%11%30%32%18%
90
16th to endDay
5%6%17%37%30%2
90
December1st to 15thDay
3216%41%32%4
90
16th to endDay
16%221%33%26%
96
January1st to 15thNight
8%211%42%26%9%
720
16th to endNight
11%112%37%27%7%
768
February1st to 15thNight
7%210%39%32%8%
704
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%
712
May1st to 15thNight
4110%38%37%7%
534
16th to endNight
5%112%34%40%4
515
June1st to 15thNight
218%38%44%4
495
16th to endNight
1333%56%6%
495
July1st to 15thNight
20%66%10%
465
16th to endNight
2112%65%17%
579
August1st to 15thNight
1116%65%15%
657
16th to endNight
1110%63%24%
700
September1st to 15thNight
2117%60%18%
660
16th to endNight
3328%48%16%
656
October1st to 15thNight
317%37%38%11%
660
16th to endNight
7%6%29%36%18%
704
November1st to 15thNight
46%37%36%13%
700
16th to endNight
6%19%34%34%13%
720
December1st to 15thNight
9%110%39%30%8%
720
16th to endNight
13%112%40%24%6%
768
Page generated at 2017-04-29 06:45:07. Version ac04

Copyright 2017 A. Danko


Temecula Clear Sky Chart | Charts Home