Cachuma Lake Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cachuma Lake Recreation Area clear sky chart from 2005-11-06 to 2024-01-12.

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
65%
24218
34%
74651
27%
24169
74%
24169
49%
36483

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
49%
756
28%
2555
20%
756
61%
756
32%
1363
January11th to 20thNight
58%
726
34%
2358
26%
726
70%
726
41%
1197
January21st to endNight
48%
792
34%
2574
25%
792
63%
792
37%
1353
February1st to 10thNight
55%
720
35%
2186
28%
720
67%
720
42%
1154
February11th to 20thNight
53%
700
35%
2098
27%
700
67%
700
43%
1055
February21st to endNight
47%
592
29%
1776
22%
592
58%
592
37%
984
March1st to 10thNight
49%
720
24%
2153
17%
720
59%
720
33%
1239
March11th to 20thNight
55%
720
27%
1980
21%
720
64%
720
40%
1134
March21st to endNight
51%
792
31%
2048
17%
792
63%
792
46%
1121
April1st to 10thNight
50%
720
31%
1800
15%
720
60%
720
47%
1012
April11th to 20thNight
51%
711
36%
1779
14%
711
62%
711
55%
921
April21st to endNight
55%
720
33%
1800
12%
720
64%
720
55%
932
May1st to 10thNight
62%
720
32%
1800
16%
720
66%
720
59%
904
May11th to 20thNight
66%
613
33%
1677
19%
613
71%
613
57%
820
May21st to endNight
59%
488
32%
1652
21%
488
69%
488
50%
713
June1st to 10thNight
74%
360
33%
1440
32%
360
81%
360
47%
574
June11th to 20thNight
80%
360
38%
1440
40%
360
87%
360
59%
520
June21st to endNight
84%
360
40%
1440
44%
360
89%
360
68%
467
July1st to 10thNight
89%
350
36%
1400
41%
350
92%
350
67%
465
July11th to 20thNight
93%
483
36%
1527
33%
483
93%
483
70%
602
July21st to endNight
89%
595
41%
1678
34%
562
91%
562
64%
728
August1st to 10thNight
84%
716
37%
1780
24%
712
85%
712
75%
831
August11th to 20thNight
92%
712
40%
1780
25%
712
93%
712
79%
807
August21st to endNight
92%
792
44%
1980
29%
792
93%
792
83%
870
September1st to 10thNight
86%
720
41%
1800
31%
720
88%
720
72%
855
September11th to 20thNight
80%
720
47%
1837
36%
720
85%
720
73%
850
September21st to endNight
83%
720
45%
1980
39%
720
89%
720
76%
834
October1st to 10thNight
75%
720
38%
2084
34%
720
83%
720
67%
896
October11th to 20thNight
70%
720
40%
2160
36%
720
79%
720
55%
995
October21st to endNight
68%
792
43%
2376
40%
792
78%
792
60%
1058
November1st to 10thNight
66%
740
39%
2319
34%
740
77%
740
55%
1032
November11th to 20thNight
66%
760
37%
2470
30%
760
80%
760
51%
1113
November21st to endNight
61%
760
35%
2470
30%
760
71%
760
45%
1202
December1st to 10thNight
57%
760
34%
2470
28%
760
67%
760
41%
1246
December11th to 20thNight
50%
760
26%
3200
25%
759
63%
759
23%
1952
December21st to endNight
48%
828
20%
4784
25%
817
61%
817
18%
2684

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%68%
74732
Night
5%313323346%67%
74985
TransparencyDay
18%48%19%30%21%
74453
Night
19%47%16%28%25%
74787
SeeingDay
8%11%26%35%17%4
14463
Night
6%6%19%34%29%7%
24236

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
11%5%15%42446%7%52%
1606
11th to 20thDay
9%413324446%60%
1630
21st to endDay
12%423324345%57%
1782
February1st to 10thDay
11%43331225%5%60%
1771
11th to 20thDay
8%32332345%8%58%
1750
21st to endDay
10%42342445%6%55%
1480
March1st to 10thDay
10%4245%36%5%5%9%47%
1804
11th to 20thDay
9%415%5%34349%54%
1980
21st to endDay
7%32332435%8%60%
2306
April1st to 10thDay
6%313325%5%6%8%58%
2160
11th to 20thDay
4324323347%67%
2129
21st to endDay
5%21232335%6%68%
2160
May1st to 10thDay
4313323446%66%
2160
11th to 20thDay
2212223447%72%
2217
21st to endDay
331222335%7%69%
2619
June1st to 10thDay
421332325%7%69%
2520
11th to 20thDay
132212235%79%
2520
21st to endDay
1112112235%80%
2520
July1st to 10thDay
112223337%77%
2520
11th to 20thDay
2212222345%76%
2376
21st to endDay
1212323448%71%
2538
August1st to 10thDay
111222335%5%75%
2149
11th to 20thDay
111112235%82%
2122
21st to endDay
111222223481%
2376
September1st to 10thDay
211212336%79%
2160
11th to 20thDay
11221223482%
2121
21st to endDay
111121223482%
1980
October1st to 10thDay
3112223345%73%
1872
11th to 20thDay
3212323235%76%
1800
21st to endDay
2212222345%74%
1980
November1st to 10thDay
4213323435%71%
1757
11th to 20thDay
3413322346%69%
1710
21st to endDay
422432445%7%63%
1710
December1st to 10thDay
8%5%24323446%59%
1710
11th to 20thDay
21%5%25%3245%45%43%
1943
21st to endDay
14%6%145%3445%8%47%
2794
January1st to 10thNight
10%42442446%7%53%
2555
11th to 20thNight
7%313434446%61%
2358
21st to endNight
9%5%23323336%59%
2574
February1st to 10thNight
9%5%24322346%61%
2186
11th to 20thNight
6%32332346%7%62%
2098
21st to endNight
9%42443434458%
1776
March1st to 10thNight
9%5%24435%6%7%9%48%
2153
11th to 20thNight
8%42443446%8%53%
1980
21st to endNight
7%32322345%7%63%
2048
April1st to 10thNight
6%41332345%6%63%
1800
11th to 20thNight
4212312345%71%
1779
21st to endNight
2112323348%70%
1800
May1st to 10thNight
23232235%6%73%
1800
11th to 20thNight
2213212346%74%
1676
21st to endNight
2322212236%74%
1652
June1st to 10thNight
22332445%8%68%
1440
11th to 20thNight
131211245%80%
1440
21st to endNight
11221222485%
1440
July1st to 10thNight
11213346%79%
1440
11th to 20thNight
12222345%79%
1578
21st to endNight
1212323346%75%
1777
August1st to 10thNight
1212212236%80%
1790
11th to 20thNight
11112245%81%
1780
21st to endNight
11111212387%
1980
September1st to 10thNight
11232222381%
1800
11th to 20thNight
12111223383%
1837
21st to endNight
1121123484%
1980
October1st to 10thNight
3112112335%78%
2084
11th to 20thNight
3213322335%74%
2160
21st to endNight
2212212235%77%
2376
November1st to 10thNight
3313323247%71%
2319
11th to 20thNight
3313323446%69%
2470
21st to endNight
5%313334447%63%
2470
December1st to 10thNight
7%42332345%6%60%
2470
11th to 20thNight
20%6%2342445%8%43%
3257
21st to endNight
13%7%25%6%3445%6%45%
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
31%47%19%26%13%
1606
11th to 20thDay
26%47%15%27%21%
1630
21st to endDay
30%38%19%21%18%
1782
February1st to 10thDay
27%25%20%25%21%
1771
11th to 20thDay
23%48%22%28%15%
1760
21st to endDay
28%49%20%27%12%
1480
March1st to 10thDay
32%6%9%19%22%12%
1804
11th to 20thDay
28%414%19%24%11%
1980
21st to endDay
23%5%12%27%24%9%
2306
April1st to 10thDay
23%6%13%24%23%10%
2160
11th to 20thDay
19%49%27%30%11%
2132
21st to endDay
17%6%9%26%34%9%
2160
May1st to 10thDay
19%411%23%31%12%
2160
11th to 20thDay
13%5%11%28%31%12%
2220
21st to endDay
14%6%11%33%28%6%
2619
June1st to 10thDay
16%5%10%24%30%15%
2520
11th to 20thDay
11%36%16%39%25%
2520
21st to endDay
10%25%9%37%36%
2520
July1st to 10thDay
9%37%11%32%38%
2451
11th to 20thDay
13%47%17%32%28%
2305
21st to endDay
14%5%8%19%34%20%
2397
August1st to 10thDay
13%37%11%35%32%
2135
11th to 20thDay
7%36%14%38%32%
2122
21st to endDay
10%26%10%37%35%
2376
September1st to 10thDay
9%37%10%31%41%
2160
11th to 20thDay
8%45%15%38%30%
2121
21st to endDay
9%3417%38%29%
1980
October1st to 10thDay
13%47%18%26%32%
1872
11th to 20thDay
14%36%15%32%31%
1800
21st to endDay
15%35%15%28%34%
1980
November1st to 10thDay
16%45%19%31%26%
1757
11th to 20thDay
18%37%17%26%29%
1710
21st to endDay
21%46%17%26%26%
1710
December1st to 10thDay
27%47%16%27%19%
1710
11th to 20thDay
41%5%7%15%20%11%
1943
21st to endDay
35%6%10%24%17%8%
2794
January1st to 10thNight
29%5%7%17%27%15%
2555
11th to 20thNight
24%5%7%16%23%25%
2358
21st to endNight
27%5%7%15%25%21%
2574
February1st to 10thNight
26%35%17%26%23%
2186
11th to 20thNight
21%46%18%31%19%
2099
21st to endNight
28%5%7%16%27%17%
1776
March1st to 10thNight
29%6%10%21%23%11%
2153
11th to 20thNight
27%6%10%18%23%16%
1980
21st to endNight
21%5%11%23%28%12%
2048
April1st to 10thNight
23%412%26%24%12%
1800
11th to 20thNight
16%411%25%31%14%
1779
21st to endNight
13%6%10%25%33%12%
1800
May1st to 10thNight
13%411%25%29%19%
1800
11th to 20thNight
12%6%9%24%32%16%
1677
21st to endNight
13%6%10%27%32%11%
1652
June1st to 10thNight
14%7%13%19%31%17%
1440
11th to 20thNight
11%46%12%35%34%
1440
21st to endNight
8%26%9%30%46%
1440
July1st to 10thNight
9%26%6%28%48%
1400
11th to 20thNight
9%37%15%24%42%
1527
21st to endNight
13%25%16%33%31%
1678
August1st to 10thNight
10%247%29%48%
1780
11th to 20thNight
7%26%10%33%42%
1780
21st to endNight
6%15%7%35%47%
1980
September1st to 10thNight
11%26%5%26%49%
1800
11th to 20thNight
9%3310%37%38%
1837
21st to endNight
7%2412%41%34%
1980
October1st to 10thNight
11%36%17%27%37%
2084
11th to 20thNight
15%46%14%27%34%
2160
21st to endNight
13%4410%30%39%
2376
November1st to 10thNight
15%36%17%31%27%
2319
11th to 20thNight
17%37%15%26%33%
2470
21st to endNight
22%37%19%21%27%
2470
December1st to 10thNight
24%47%16%25%24%
2470
11th to 20thNight
40%5%7%16%19%12%
3257
21st to endNight
37%6%8%20%19%9%
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
20%13%32%23%12%1
267
11th to 20thDay
17%15%25%28%13%2
344
21st to endDay
14%14%35%26%9%2
374
February1st to 10thDay
14%14%24%27%17%4
408
11th to 20thDay
17%17%28%26%10%2
415
21st to endDay
14%18%32%26%9%2
346
March1st to 10thDay
19%20%32%22%6%1
420
11th to 20thDay
15%20%30%27%7%1
420
21st to endDay
16%22%33%23%6%
462
April1st to 10thDay
11%18%33%24%11%2
420
11th to 20thDay
10%20%37%24%6%2
412
21st to endDay
8%18%34%25%13%3
420
May1st to 10thDay
11%17%31%27%11%3
423
11th to 20thDay
6%15%35%29%13%2
448
21st to endDay
10%14%32%32%11%3
485
June1st to 10thDay
6%8%27%36%21%2
450
11th to 20thDay
47%27%38%18%6%
450
21st to endDay
2422%44%22%5%
450
July1st to 10thDay
2117%48%27%5%
446
11th to 20thDay
2110%45%32%9%
444
21st to endDay
2113%47%28%10%
487
August1st to 10thDay
2222%47%23%4
447
11th to 20thDay
2114%46%31%7%
437
21st to endDay
2214%49%29%4
495
September1st to 10thDay
3320%47%22%5%
450
11th to 20thDay
26%29%45%15%4
450
21st to endDay
18%24%42%22%3
450
October1st to 10thDay
410%26%37%21%2
450
11th to 20thDay
48%28%39%18%3
450
21st to endDay
6%9%26%35%20%4
495
November1st to 10thDay
7%9%25%34%20%4
353
11th to 20thDay
7%9%24%40%17%4
270
21st to endDay
7%10%24%35%20%4
270
December1st to 10thDay
11%11%30%30%16%2
270
11th to 20thDay
12%15%24%28%16%6%
187
21st to endDay
21%15%31%21%10%3
198
January1st to 10thNight
12%8%24%29%17%10%
760
11th to 20thNight
8%6%24%33%21%8%
726
21st to endNight
10%8%28%32%16%5%
792
February1st to 10thNight
11%5%22%33%23%5%
720
11th to 20thNight
8%11%24%32%18%7%
704
21st to endNight
11%11%26%32%18%3
592
March1st to 10thNight
11%10%24%36%15%3
720
11th to 20thNight
9%8%22%35%22%4
720
21st to endNight
9%10%27%34%17%3
792
April1st to 10thNight
8%7%30%34%19%3
720
11th to 20thNight
6%10%28%32%19%4
711
21st to endNight
310%28%31%21%7%
720
May1st to 10thNight
5%8%22%35%27%4
720
11th to 20thNight
46%21%36%30%4
613
21st to endNight
38%27%32%28%2
490
June1st to 10thNight
15%16%37%39%3
360
11th to 20thNight
2213%38%40%6%
360
21st to endNight
1111%34%46%6%
360
July1st to 10thNight
8%29%51%11%
350
11th to 20thNight
1221%59%17%
483
21st to endNight
1323%55%19%
595
August1st to 10thNight
29%35%44%10%
716
11th to 20thNight
1428%55%12%
712
21st to endNight
11431%52%12%
792
September1st to 10thNight
227%33%45%10%
720
11th to 20thNight
2213%40%35%9%
720
21st to endNight
1213%36%40%9%
720
October1st to 10thNight
3315%41%33%5%
720
11th to 20thNight
4417%40%28%8%
720
21st to endNight
3420%35%29%9%
792
November1st to 10thNight
6%5%20%36%25%9%
740
11th to 20thNight
6%418%39%27%6%
760
21st to endNight
6%5%22%38%21%7%
760
December1st to 10thNight
9%6%20%34%24%7%
760
11th to 20thNight
12%7%24%35%18%4
760
21st to endNight
11%12%23%34%16%5%
836
Page generated at 2024-01-09 04:14:40. Version ac07

Copyright 2024 Attilla Danko


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