Santa Paula
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Santa Paula clear sky chart from 2005-11-06 to 2024-02-15.

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
71%
24399
33%
79566
28%
24297
78%
24297
47%
38686

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 10thNight
52%
754
36%
4221
23%
736
65%
736
29%
1622
January11th to 20thNight
54%
751
34%
4040
25%
740
70%
740
26%
1965
January21st to endNight
49%
832
25%
4058
24%
814
67%
814
25%
2024
February1st to 10thNight
55%
760
36%
2280
27%
760
68%
760
41%
1204
February11th to 20thNight
60%
718
36%
2151
29%
718
73%
718
48%
1081
February21st to endNight
56%
592
30%
1776
26%
592
65%
592
40%
953
March1st to 10thNight
56%
720
26%
2160
22%
720
65%
720
39%
1192
March11th to 20thNight
67%
720
27%
2049
24%
720
72%
720
43%
1118
March21st to endNight
65%
792
32%
2003
22%
792
71%
792
49%
1135
April1st to 10thNight
70%
720
31%
1800
20%
720
74%
720
51%
1010
April11th to 20thNight
67%
711
34%
1779
18%
711
73%
711
56%
946
April21st to endNight
76%
720
34%
1800
18%
720
80%
720
58%
946
May1st to 10thNight
75%
720
28%
1800
17%
720
76%
720
51%
1007
May11th to 20thNight
77%
541
31%
1605
23%
541
79%
541
51%
788
May21st to endNight
77%
582
30%
1746
23%
582
80%
582
57%
822
June1st to 10thNight
84%
382
31%
1462
34%
382
86%
382
45%
647
June11th to 20thNight
88%
360
34%
1440
40%
360
90%
360
54%
551
June21st to endNight
92%
360
37%
1440
46%
360
93%
360
56%
536
July1st to 10thNight
92%
350
36%
1400
43%
350
92%
350
61%
492
July11th to 20thNight
93%
402
36%
1446
37%
402
93%
402
60%
550
July21st to endNight
91%
691
34%
1769
25%
653
92%
653
65%
832
August1st to 10thNight
91%
716
33%
1780
22%
712
91%
712
70%
864
August11th to 20thNight
92%
712
36%
1780
22%
712
92%
712
70%
866
August21st to endNight
94%
792
40%
1980
27%
792
94%
792
75%
925
September1st to 10thNight
88%
720
40%
1800
30%
720
89%
720
67%
890
September11th to 20thNight
89%
720
42%
1883
37%
720
90%
720
69%
886
September21st to endNight
89%
720
42%
1980
39%
720
92%
720
68%
894
October1st to 10thNight
80%
720
38%
1998
34%
720
86%
720
64%
917
October11th to 20thNight
74%
720
39%
2160
38%
720
80%
720
57%
996
October21st to endNight
71%
792
41%
2376
36%
792
81%
792
58%
1084
November1st to 10thNight
71%
740
36%
2380
33%
740
80%
740
56%
1032
November11th to 20thNight
68%
760
37%
2470
32%
760
79%
760
52%
1106
November21st to endNight
56%
760
36%
2470
30%
760
68%
760
47%
1167
December1st to 10thNight
53%
760
33%
2470
26%
760
65%
760
41%
1250
December11th to 20thNight
51%
760
29%
3058
24%
759
67%
759
27%
1815
December21st to endNight
52%
829
20%
4756
26%
817
65%
817
21%
2573

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
5%313323346%67%
78620
Night
6%313323346%67%
80481
TransparencyDay
20%48%18%27%23%
78341
Night
21%48%17%26%25%
80281
SeeingDay
7%8%29%36%15%5%
14561
Night
6%315%33%33%10%
24431

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 10thDay
6%213222345%69%
2575
11th to 20thDay
9%41432335%8%58%
2860
21st to endDay
12%5%1431445%8%53%
3277
February1st to 10thDay
10%423213345%62%
1900
11th to 20thDay
6%312323448%64%
1791
21st to endDay
8%314333447%61%
1480
March1st to 10thDay
7%5%244345%5%7%54%
1800
11th to 20thDay
8%32332446%9%57%
1907
21st to endDay
5%224425%45%7%61%
2352
April1st to 10thDay
6%42332345%8%61%
2160
11th to 20thDay
4323223347%66%
2129
21st to endDay
4423222237%68%
2160
May1st to 10thDay
5%42331345%8%63%
2160
11th to 20thDay
341222345%8%66%
2287
21st to endDay
3413323347%67%
2530
June1st to 10thDay
5%424323347%63%
2492
11th to 20thDay
3323213337%70%
2520
21st to endDay
121221324478%
2520
July1st to 10thDay
121221235%6%75%
2520
11th to 20thDay
2212212335%78%
2462
21st to endDay
2112213448%71%
2443
August1st to 10thDay
221321225%5%76%
2149
11th to 20thDay
111212235%81%
2122
21st to endDay
1111213335%80%
2376
September1st to 10thDay
111221234479%
2160
11th to 20thDay
2112212225%80%
2075
21st to endDay
2212212235%79%
1980
October1st to 10thDay
3212222345%74%
1958
11th to 20thDay
4212322225%74%
1800
21st to endDay
221222333474%
1980
November1st to 10thDay
2212322347%73%
1697
11th to 20thDay
4312322346%70%
1710
21st to endDay
3313433447%67%
1710
December1st to 10thDay
7%324224447%60%
1710
11th to 20thDay
17%6%2442435%8%47%
2074
21st to endDay
11%5%25%6%345%5%7%48%
2794
January1st to 10thNight
7%313323335%66%
4367
11th to 20thNight
8%5%24423448%56%
4110
21st to endNight
12%6%2332445%6%54%
4391
February1st to 10thNight
9%424223245%63%
2280
11th to 20thNight
7%313213436%67%
2151
21st to endNight
10%323323345%62%
1776
March1st to 10thNight
8%5%2442445%7%56%
2160
11th to 20thNight
7%41342345%7%60%
2049
21st to endNight
6%423423446%63%
2003
April1st to 10thNight
6%422423348%63%
1800
11th to 20thNight
341321235%6%69%
1779
21st to endNight
3412322346%71%
1800
May1st to 10thNight
4413223447%66%
1800
11th to 20thNight
25%12323335%70%
1604
21st to endNight
1313212346%74%
1746
June1st to 10thNight
2412312448%69%
1462
11th to 20thNight
1212312245%77%
1440
21st to endNight
1112111335%80%
1440
July1st to 10thNight
1111312345%78%
1440
11th to 20thNight
1112112346%78%
1494
21st to endNight
111122235%7%75%
1873
August1st to 10thNight
2112211345%78%
1790
11th to 20thNight
1111212246%78%
1780
21st to endNight
111112235%82%
1980
September1st to 10thNight
2212212236%77%
1800
11th to 20thNight
21122222481%
1883
21st to endNight
1111112235%81%
1980
October1st to 10thNight
3222223245%75%
1998
11th to 20thNight
3313312235%73%
2160
21st to endNight
2313212345%75%
2376
November1st to 10thNight
3212222336%72%
2380
11th to 20thNight
3312222345%72%
2470
21st to endNight
5%213323446%66%
2470
December1st to 10thNight
8%324423346%62%
2470
11th to 20thNight
20%5%2332335%7%47%
3117
21st to endNight
13%5%245%35%45%7%48%
4862

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 10thDay
18%36%26%32%15%
2575
11th to 20thDay
26%7%15%19%18%15%
2860
21st to endDay
30%37%21%24%15%
3277
February1st to 10thDay
26%35%15%24%26%
1900
11th to 20thDay
21%38%17%28%22%
1801
21st to endDay
24%410%19%25%18%
1480
March1st to 10thDay
31%310%17%19%20%
1800
11th to 20thDay
24%6%11%20%23%16%
1907
21st to endDay
22%6%13%23%25%12%
2352
April1st to 10thDay
23%7%12%26%21%12%
2160
11th to 20thDay
19%5%9%26%27%15%
2132
21st to endDay
19%49%26%33%10%
2160
May1st to 10thDay
21%5%11%22%27%14%
2160
11th to 20thDay
19%6%9%25%29%11%
2290
21st to endDay
19%6%10%30%27%8%
2530
June1st to 10thDay
23%5%11%19%30%12%
2492
11th to 20thDay
18%49%14%34%21%
2520
21st to endDay
13%36%9%36%34%
2520
July1st to 10thDay
13%26%11%27%41%
2451
11th to 20thDay
12%36%19%32%28%
2387
21st to endDay
15%38%22%30%20%
2307
August1st to 10thDay
13%35%12%35%32%
2135
11th to 20thDay
9%25%12%38%34%
2122
21st to endDay
11%25%10%38%35%
2376
September1st to 10thDay
11%26%9%32%40%
2160
11th to 20thDay
11%26%14%30%37%
2075
21st to endDay
12%25%14%35%31%
1980
October1st to 10thDay
14%38%20%23%32%
1958
11th to 20thDay
17%36%13%27%34%
1800
21st to endDay
15%45%13%24%39%
1980
November1st to 10thDay
16%45%16%27%32%
1697
11th to 20thDay
17%37%14%21%38%
1710
21st to endDay
19%38%15%22%32%
1710
December1st to 10thDay
25%46%17%23%25%
1710
11th to 20thDay
38%48%17%19%15%
2073
21st to endDay
34%6%9%24%15%12%
2794
January1st to 10thNight
22%46%15%35%19%
4367
11th to 20thNight
28%6%9%23%16%17%
4110
21st to endNight
30%37%17%26%17%
4391
February1st to 10thNight
26%35%13%24%29%
2280
11th to 20thNight
22%35%19%25%26%
2152
21st to endNight
27%47%15%25%22%
1776
March1st to 10thNight
28%49%18%23%17%
2160
11th to 20thNight
25%5%10%16%26%19%
2049
21st to endNight
23%5%9%24%24%15%
2003
April1st to 10thNight
23%413%25%22%13%
1800
11th to 20thNight
18%410%23%28%17%
1779
21st to endNight
17%49%24%34%13%
1800
May1st to 10thNight
21%6%9%23%27%14%
1800
11th to 20thNight
18%5%10%27%27%13%
1605
21st to endNight
14%6%11%31%30%8%
1746
June1st to 10thNight
19%5%13%22%29%13%
1462
11th to 20thNight
12%5%9%19%35%20%
1440
21st to endNight
12%45%12%33%34%
1440
July1st to 10thNight
12%18%12%21%45%
1400
11th to 20thNight
11%47%21%29%28%
1446
21st to endNight
14%210%24%30%20%
1769
August1st to 10thNight
11%37%11%32%35%
1780
11th to 20thNight
10%48%9%37%32%
1780
21st to endNight
10%26%10%36%36%
1980
September1st to 10thNight
14%26%9%27%42%
1800
11th to 20thNight
11%36%11%33%36%
1883
21st to endNight
9%5%5%11%34%36%
1980
October1st to 10thNight
13%37%17%26%34%
1998
11th to 20thNight
16%37%14%24%37%
2160
21st to endNight
15%35%10%21%45%
2376
November1st to 10thNight
16%26%15%26%34%
2380
11th to 20thNight
17%36%12%22%39%
2470
21st to endNight
21%36%17%19%34%
2470
December1st to 10thNight
25%47%15%20%30%
2470
11th to 20thNight
38%47%13%21%17%
3117
21st to endNight
36%5%8%22%17%12%
4862

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 10thDay
16%11%36%28%8%1
203
11th to 20thDay
11%14%38%29%8%1
370
21st to endDay
14%13%38%26%7%1
445
February1st to 10thDay
13%13%38%27%7%3
460
11th to 20thDay
9%15%37%32%5%2
432
21st to endDay
12%18%37%27%6%
346
March1st to 10thDay
15%16%38%23%7%
420
11th to 20thDay
12%13%39%25%9%2
420
21st to endDay
11%15%37%29%7%
462
April1st to 10thDay
10%12%36%28%11%3
420
11th to 20thDay
7%16%39%27%7%4
412
21st to endDay
6%10%34%32%14%5%
420
May1st to 10thDay
10%12%31%33%9%5%
423
11th to 20thDay
5%11%28%36%15%4
448
21st to endDay
9%11%30%33%14%4
485
June1st to 10thDay
7%9%21%38%19%6%
450
11th to 20thDay
6%6%21%41%20%7%
450
21st to endDay
3421%42%22%9%
450
July1st to 10thDay
215%46%27%9%
446
11th to 20thDay
218%47%29%14%
444
21st to endDay
119%48%26%15%
487
August1st to 10thDay
1217%49%20%11%
447
11th to 20thDay
2110%51%22%14%
437
21st to endDay
2214%49%23%10%
495
September1st to 10thDay
3222%47%19%7%
450
11th to 20thDay
2430%46%14%4
450
21st to endDay
26%25%42%20%5%
450
October1st to 10thDay
37%33%42%15%1
450
11th to 20thDay
36%35%40%14%2
450
21st to endDay
47%36%33%17%3
495
November1st to 10thDay
5%5%32%38%17%3
293
11th to 20thDay
5%10%35%36%12%2
270
21st to endDay
7%11%35%32%13%2
270
December1st to 10thDay
11%9%36%31%12%1
270
11th to 20thDay
7%13%32%31%15%2
243
21st to endDay
13%15%37%23%11%2
198
January1st to 10thNight
11%6%25%37%16%5%
760
11th to 20thNight
8%6%27%40%17%3
760
21st to endNight
12%8%25%36%15%4
836
February1st to 10thNight
11%8%21%34%21%5%
760
11th to 20thNight
8%225%40%19%6%
722
21st to endNight
11%5%21%40%20%2
592
March1st to 10thNight
10%423%41%20%2
720
11th to 20thNight
9%415%40%26%7%
720
21st to endNight
8%317%45%23%4
792
April1st to 10thNight
7%215%43%28%5%
720
11th to 20thNight
5%319%37%30%5%
711
21st to endNight
4313%42%31%8%
720
May1st to 10thNight
7%212%41%32%7%
720
11th to 20thNight
4212%33%42%7%
541
21st to endNight
2214%34%39%8%
584
June1st to 10thNight
35%32%47%13%
382
11th to 20thNight
115%25%55%13%
360
21st to endNight
1324%58%14%
360
July1st to 10thNight
21113%62%22%
350
11th to 20thNight
126%58%33%
402
21st to endNight
2213%56%28%
691
August1st to 10thNight
2222%54%21%
716
11th to 20thNight
21212%60%24%
712
21st to endNight
2117%57%23%
792
September1st to 10thNight
31420%53%19%
720
11th to 20thNight
21430%48%15%
720
21st to endNight
26%32%44%15%
720
October1st to 10thNight
3111%40%39%6%
720
11th to 20thNight
3214%39%34%8%
720
21st to endNight
3319%34%30%11%
792
November1st to 10thNight
4219%41%26%8%
740
11th to 20thNight
5%319%40%26%7%
760
21st to endNight
6%428%35%22%5%
760
December1st to 10thNight
8%7%25%36%19%5%
760
11th to 20thNight
13%5%27%35%17%3
760
21st to endNight
11%5%26%37%16%4
836
Page generated at 2024-02-12 03:35:31. Version ac07

Copyright 2024 Attilla Danko


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