Moreno Valley
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moreno Valley 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
75%
24639
34%
74198
31%
24589
78%
24589
48%
37765

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
64%
757
29%
2457
29%
756
68%
756
39%
1288
January11th to 20thNight
67%
724
36%
2273
33%
724
74%
724
41%
1195
January21st to endNight
60%
792
36%
2376
29%
792
70%
792
40%
1298
February1st to 10thNight
66%
720
35%
2160
34%
720
72%
720
46%
1114
February11th to 20thNight
66%
700
32%
2098
31%
700
71%
700
43%
1121
February21st to endNight
59%
592
30%
1776
30%
592
63%
592
35%
1025
March1st to 10thNight
62%
720
24%
2160
25%
720
66%
720
33%
1282
March11th to 20thNight
68%
720
26%
2087
27%
720
70%
720
42%
1152
March21st to endNight
64%
792
27%
2039
20%
792
68%
792
42%
1218
April1st to 10thNight
66%
720
28%
1800
20%
720
68%
720
42%
1104
April11th to 20thNight
67%
711
31%
1779
20%
711
69%
711
48%
1022
April21st to endNight
70%
720
31%
1800
20%
720
72%
720
48%
1033
May1st to 10thNight
70%
596
30%
1676
22%
596
71%
596
43%
943
May11th to 20thNight
75%
531
32%
1595
26%
531
76%
531
47%
831
May21st to endNight
72%
582
27%
1746
22%
582
72%
582
43%
942
June1st to 10thNight
81%
540
32%
1620
29%
540
82%
540
57%
773
June11th to 20thNight
85%
540
35%
1620
32%
540
86%
540
62%
727
June21st to endNight
92%
381
40%
1461
48%
381
92%
381
67%
501
July1st to 10thNight
95%
392
39%
1442
42%
392
95%
392
75%
476
July11th to 20thNight
93%
522
36%
1566
31%
522
93%
522
71%
638
July21st to endNight
88%
671
33%
1750
26%
634
88%
634
59%
852
August1st to 10thNight
92%
716
36%
1780
24%
712
92%
712
74%
845
August11th to 20thNight
95%
712
41%
1780
26%
712
95%
712
80%
799
August21st to endNight
94%
792
44%
1980
31%
792
94%
792
76%
920
September1st to 10thNight
88%
720
41%
1800
32%
720
89%
720
68%
887
September11th to 20thNight
88%
720
43%
1980
41%
720
88%
720
69%
888
September21st to endNight
86%
720
43%
1980
40%
720
88%
720
68%
902
October1st to 10thNight
81%
720
37%
1980
34%
720
84%
720
58%
970
October11th to 20thNight
80%
720
43%
2006
41%
720
82%
720
61%
960
October21st to endNight
75%
792
38%
2470
40%
792
79%
792
54%
1149
November1st to 10thNight
79%
740
37%
2405
41%
740
82%
740
55%
1055
November11th to 20thNight
79%
760
39%
2470
40%
760
84%
760
53%
1115
November21st to endNight
71%
760
34%
2470
36%
760
74%
760
42%
1253
December1st to 10thNight
67%
760
32%
2470
33%
760
71%
760
39%
1298
December11th to 20thNight
61%
760
30%
2941
31%
759
67%
759
29%
1680
December21st to endNight
60%
824
20%
4405
30%
817
68%
817
22%
2509

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%
75095
Night
6%413323346%65%
74622
TransparencyDay
19%35%15%27%30%
74825
Night
22%45%16%25%28%
74415
SeeingDay
6%5%19%36%25%9%
14543
Night
7%211%35%37%9%
24660

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
9%32343345%8%57%
1708
11th to 20thDay
7%3222145%47%62%
1705
21st to endDay
9%414423345%60%
1980
February1st to 10thDay
8%312333246%65%
1800
11th to 20thDay
9%41332345%7%59%
1750
21st to endDay
10%5%25%433337%55%
1480
March1st to 10thDay
8%4235%345%6%8%52%
1800
11th to 20thDay
7%42333335%9%59%
1872
21st to endDay
5%323325%5%6%8%58%
2312
April1st to 10thDay
6%423323448%60%
2160
11th to 20thDay
5%31332435%6%65%
2129
21st to endDay
5%423223236%68%
2160
May1st to 10thDay
6%5%2332335%7%62%
2281
11th to 20thDay
5%5%23322346%65%
2301
21st to endDay
5%5%24423346%63%
2530
June1st to 10thDay
3314313336%69%
2340
11th to 20thDay
3312111225%76%
2340
21st to endDay
121221222381%
2485
July1st to 10thDay
2212212235%77%
2462
11th to 20thDay
1112223345%76%
2340
21st to endDay
221232336%7%69%
2462
August1st to 10thDay
1112212236%79%
2149
11th to 20thDay
111212235%83%
2122
21st to endDay
112213335%79%
2376
September1st to 10thDay
221222324477%
2160
11th to 20thDay
221121222482%
1980
21st to endDay
221221133481%
1980
October1st to 10thDay
3312323335%71%
1980
11th to 20thDay
431221233475%
1949
21st to endDay
4312212335%74%
1883
November1st to 10thDay
3212313346%72%
1674
11th to 20thDay
3213323446%70%
1710
21st to endDay
6%313424348%62%
1710
December1st to 10thDay
6%414423448%60%
1710
11th to 20thDay
11%5%25%43446%9%48%
2169
21st to endDay
10%6%25%6%45%5%6%6%45%
3146
January1st to 10thNight
9%5%24423447%56%
2457
11th to 20thNight
7%5%23324346%60%
2273
21st to endNight
10%5%24422346%59%
2376
February1st to 10thNight
8%424322335%63%
2160
11th to 20thNight
9%423323445%61%
2098
21st to endNight
12%6%2432445%7%52%
1776
March1st to 10thNight
9%5%25%44445%9%48%
2160
11th to 20thNight
10%5%2331335%7%57%
2087
21st to endNight
7%5%245%3435%7%56%
2039
April1st to 10thNight
8%5%3432445%8%55%
1800
11th to 20thNight
8%5%2322245%5%62%
1779
21st to endNight
8%5%23213246%64%
1800
May1st to 10thNight
7%7%23322338%61%
1676
11th to 20thNight
6%413223447%63%
1594
21st to endNight
7%5%23212446%65%
1746
June1st to 10thNight
3422212236%73%
1620
11th to 20thNight
221221223479%
1620
21st to endNight
111111223484%
1461
July1st to 10thNight
1211233484%
1484
11th to 20thNight
111212347%77%
1620
21st to endNight
2112324446%71%
1853
August1st to 10thNight
22221223480%
1790
11th to 20thNight
11112235%84%
1780
21st to endNight
11121222484%
1980
September1st to 10thNight
2312213225%77%
1800
11th to 20thNight
221221112283%
1980
21st to endNight
231221222381%
1980
October1st to 10thNight
3323323336%70%
1980
11th to 20thNight
431232223475%
2006
21st to endNight
5%41321233471%
2470
November1st to 10thNight
4312313336%71%
2405
11th to 20thNight
3313323336%70%
2470
21st to endNight
6%41443345%7%58%
2470
December1st to 10thNight
8%424333448%56%
2470
11th to 20thNight
11%5%25%5%3445%8%48%
3041
21st to endNight
10%7%25%6%3445%7%46%
4521

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
26%45%18%25%22%
1709
11th to 20thDay
21%46%15%27%26%
1705
21st to endDay
27%27%15%20%28%
1980
February1st to 10thDay
23%3412%26%31%
1800
11th to 20thDay
26%3414%29%26%
1760
21st to endDay
31%5%6%14%22%23%
1480
March1st to 10thDay
27%6%8%17%21%21%
1800
11th to 20thDay
24%38%18%26%20%
1872
21st to endDay
23%5%10%23%23%17%
2312
April1st to 10thDay
25%48%22%25%15%
2160
11th to 20thDay
20%46%21%28%22%
2132
21st to endDay
19%46%20%35%16%
2160
May1st to 10thDay
23%5%8%19%26%20%
2281
11th to 20thDay
20%5%6%20%34%16%
2304
21st to endDay
23%47%27%28%12%
2530
June1st to 10thDay
17%27%22%32%21%
2340
11th to 20thDay
13%3213%29%40%
2340
21st to endDay
11%237%26%51%
2485
July1st to 10thDay
11%2310%22%52%
2396
11th to 20thDay
11%45%17%29%34%
2271
21st to endDay
14%5%9%21%29%22%
2325
August1st to 10thDay
9%3212%28%45%
2135
11th to 20thDay
7%3314%30%43%
2122
21st to endDay
9%3310%33%42%
2376
September1st to 10thDay
12%347%31%43%
2160
11th to 20thDay
9%219%33%46%
1980
21st to endDay
11%2212%30%43%
1980
October1st to 10thDay
17%3417%24%36%
1980
11th to 20thDay
15%3310%28%41%
1949
21st to endDay
15%3310%23%46%
1883
November1st to 10thDay
15%3414%28%36%
1674
11th to 20thDay
16%35%11%24%41%
1710
21st to endDay
24%36%12%22%34%
1710
December1st to 10thDay
23%48%16%19%30%
1710
11th to 20thDay
35%49%14%19%19%
2168
21st to endDay
39%5%7%18%18%13%
3146
January1st to 10thNight
28%45%15%25%23%
2457
11th to 20thNight
26%5%414%23%29%
2273
21st to endNight
28%48%13%18%29%
2376
February1st to 10thNight
25%35%14%24%29%
2160
11th to 20thNight
27%35%15%23%27%
2099
21st to endNight
32%5%5%16%21%22%
1776
March1st to 10thNight
32%7%5%19%17%19%
2160
11th to 20thNight
27%49%17%24%19%
2087
21st to endNight
28%6%8%23%21%14%
2039
April1st to 10thNight
29%6%8%23%18%15%
1800
11th to 20thNight
24%6%5%23%23%20%
1779
21st to endNight
23%6%5%24%29%14%
1800
May1st to 10thNight
24%8%6%22%21%18%
1676
11th to 20thNight
22%6%7%28%25%13%
1595
21st to endNight
23%8%10%27%23%10%
1746
June1st to 10thNight
16%47%22%32%18%
1620
11th to 20thNight
13%4413%31%34%
1620
21st to endNight
9%238%30%48%
1461
July1st to 10thNight
6%2211%29%49%
1442
11th to 20thNight
9%37%19%31%31%
1566
21st to endNight
16%48%24%32%16%
1750
August1st to 10thNight
10%3413%34%37%
1780
11th to 20thNight
6%3217%33%39%
1780
21st to endNight
7%3211%36%40%
1980
September1st to 10thNight
12%3410%30%41%
1800
11th to 20thNight
10%3311%29%44%
1980
21st to endNight
12%3313%32%38%
1980
October1st to 10thNight
17%36%18%25%30%
1980
11th to 20thNight
15%3312%30%36%
2006
21st to endNight
17%439%21%46%
2470
November1st to 10thNight
16%3416%25%36%
2405
11th to 20thNight
17%3314%21%41%
2470
21st to endNight
25%46%14%18%33%
2470
December1st to 10thNight
27%46%14%18%29%
2470
11th to 20thNight
35%47%14%22%18%
3041
21st to endNight
37%7%8%18%17%13%
4521

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
14%416%42%22%2
270
11th to 20thDay
12%5%20%35%24%4
319
21st to endDay
10%8%28%35%16%3
462
February1st to 10thDay
10%7%25%33%19%5%
420
11th to 20thDay
11%9%29%33%16%2
415
21st to endDay
12%14%28%30%14%1
346
March1st to 10thDay
13%14%25%33%13%2
420
11th to 20thDay
11%10%27%32%14%4
420
21st to endDay
9%12%32%32%13%2
462
April1st to 10thDay
9%10%25%31%21%4
420
11th to 20thDay
414%33%31%14%5%
412
21st to endDay
6%11%27%30%17%9%
420
May1st to 10thDay
9%9%28%33%16%5%
423
11th to 20thDay
9%6%25%36%20%4
448
21st to endDay
7%6%25%36%19%6%
485
June1st to 10thDay
5%318%33%30%11%
450
11th to 20thDay
4217%36%28%14%
450
21st to endDay
3213%36%30%15%
450
July1st to 10thDay
38%36%34%18%
446
11th to 20thDay
15%34%36%23%
444
21st to endDay
11439%34%20%
487
August1st to 10thDay
28%43%31%15%
447
11th to 20thDay
26%40%33%19%
437
21st to endDay
215%41%34%18%
495
September1st to 10thDay
3111%44%30%11%
450
11th to 20thDay
2114%46%28%8%
450
21st to endDay
2220%35%27%14%
450
October1st to 10thDay
4421%37%29%5%
450
11th to 20thDay
45%19%37%28%7%
450
21st to endDay
4321%32%28%12%
398
November1st to 10thDay
5%217%37%31%7%
270
11th to 20thDay
3318%40%27%10%
270
21st to endDay
7%6%17%38%24%7%
270
December1st to 10thDay
9%5%15%38%28%4
270
11th to 20thDay
7%219%34%29%8%
270
21st to endDay
14%7%24%32%20%3
297
January1st to 10thNight
11%316%40%23%8%
760
11th to 20thNight
9%317%40%26%6%
724
21st to endNight
11%218%42%21%5%
792
February1st to 10thNight
10%215%42%25%7%
720
11th to 20thNight
10%316%44%22%6%
704
21st to endNight
14%6%15%41%20%5%
592
March1st to 10thNight
10%417%45%21%4
720
11th to 20thNight
10%414%37%27%8%
720
21st to endNight
8%417%41%26%4
792
April1st to 10thNight
9%314%43%28%4
720
11th to 20thNight
6%5%15%40%29%5%
711
21st to endNight
8%414%36%31%7%
720
May1st to 10thNight
7%413%39%31%5%
596
11th to 20thNight
6%212%31%42%7%
531
21st to endNight
7%413%39%33%4
584
June1st to 10thNight
3110%38%43%5%
540
11th to 20thNight
217%38%48%4
540
21st to endNight
21329%59%7%
381
July1st to 10thNight
1121%65%13%
392
11th to 20thNight
2125%64%8%
522
21st to endNight
2217%65%14%
671
August1st to 10thNight
11127%55%15%
716
11th to 20thNight
1115%63%20%
712
21st to endNight
1117%60%21%
792
September1st to 10thNight
41220%57%16%
720
11th to 20thNight
315%26%54%12%
720
21st to endNight
316%31%46%13%
720
October1st to 10thNight
5%17%40%41%6%
720
11th to 20thNight
5%19%34%40%11%
720
21st to endNight
6%213%33%33%13%
792
November1st to 10thNight
439%40%33%11%
740
11th to 20thNight
4111%42%31%11%
760
21st to endNight
7%214%39%30%8%
760
December1st to 10thNight
9%315%39%27%7%
760
11th to 20thNight
12%315%41%23%5%
760
21st to endNight
11%420%39%20%6%
836
Page generated at 2024-01-08 19:31:28. Version ac07

Copyright 2024 Attilla Danko


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