Observatorio De Solitario
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Observatorio De Solitario clear sky chart from 2005-11-06 to 2024-03-08.

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
66%
23769
32%
79161
25%
23673
74%
23673
44%
38277

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
65%
752
49%
3639
28%
736
74%
736
47%
1129
January11th to 20thNight
65%
757
47%
3572
26%
740
75%
740
47%
1135
January21st to endNight
56%
829
25%
3858
26%
814
67%
814
29%
1893
February1st to 10thNight
58%
760
37%
2280
23%
760
70%
760
49%
1124
February11th to 20thNight
59%
744
29%
2218
20%
740
68%
740
45%
1142
February21st to endNight
52%
628
34%
1884
20%
628
65%
628
48%
935
March1st to 10thNight
51%
750
31%
2250
17%
750
63%
750
42%
1196
March11th to 20thNight
53%
720
30%
2062
18%
720
62%
720
42%
1116
March21st to endNight
49%
602
41%
1988
26%
602
67%
602
49%
890
April1st to 10thNight
52%
540
39%
1800
26%
540
70%
540
43%
870
April11th to 20thNight
48%
533
35%
1777
23%
533
66%
533
50%
791
April21st to endNight
50%
540
37%
1800
27%
540
69%
540
51%
796
May1st to 10thNight
59%
540
30%
1800
26%
540
72%
540
50%
817
May11th to 20thNight
56%
531
26%
1770
25%
531
64%
531
39%
919
May21st to endNight
61%
582
27%
1837
26%
582
69%
582
43%
946
June1st to 10thNight
72%
540
26%
1620
26%
540
77%
540
52%
789
June11th to 20thNight
74%
540
26%
1620
26%
540
77%
540
43%
874
June21st to endNight
78%
540
27%
1691
29%
540
80%
540
46%
863
July1st to 10thNight
74%
525
17%
1750
20%
525
75%
525
32%
990
July11th to 20thNight
86%
522
28%
1740
33%
522
88%
522
50%
803
July21st to endNight
82%
591
27%
1859
32%
558
84%
558
42%
953
August1st to 10thNight
85%
537
27%
1779
33%
534
87%
534
48%
839
August11th to 20thNight
80%
534
25%
1778
30%
534
81%
534
35%
968
August21st to endNight
79%
594
21%
1980
23%
594
80%
594
31%
1152
September1st to 10thNight
80%
540
24%
1800
26%
540
81%
540
34%
1003
September11th to 20thNight
72%
540
25%
1925
28%
540
74%
540
28%
1111
September21st to endNight
73%
540
27%
1980
29%
540
75%
540
35%
1024
October1st to 10thNight
77%
540
33%
1980
34%
540
80%
540
43%
920
October11th to 20thNight
72%
607
38%
2047
33%
607
77%
607
44%
1007
October21st to endNight
71%
792
40%
2376
28%
792
76%
792
56%
1103
November1st to 10thNight
77%
751
39%
2231
28%
751
81%
751
59%
1018
November11th to 20thNight
74%
950
34%
2470
21%
950
77%
950
56%
1283
November21st to endNight
62%
950
36%
2470
19%
950
70%
950
52%
1326
December1st to 10thNight
71%
950
37%
2470
25%
950
74%
950
50%
1370
December11th to 20thNight
64%
948
35%
2895
22%
948
71%
948
47%
1485
December21st to endNight
63%
930
26%
4165
25%
922
73%
922
40%
1697

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
431332345%7%64%
79187
Night
431332445%8%62%
80430
TransparencyDay
19%6%9%19%25%22%
78937
Night
20%6%10%18%24%22%
80202
SeeingDay
5%6%19%34%28%8%
13456
Night
5%420%46%24%1
23802

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
4212322335%74%
3167
11th to 20thDay
4312212235%75%
3170
21st to endDay
5%423423346%63%
3487
February1st to 10thDay
342342345%5%66%
1900
11th to 20thDay
45%24324337%63%
1849
21st to endDay
431232345%6%68%
1570
March1st to 10thDay
3313425%45%8%60%
1870
11th to 20thDay
6%5%134245%5%6%60%
1894
21st to endDay
3312223346%71%
2366
April1st to 10thDay
221242345%7%67%
2160
11th to 20thDay
221222245%6%72%
2131
21st to endDay
4312312345%72%
2160
May1st to 10thDay
2213323347%69%
2160
11th to 20thDay
3213323448%67%
2125
21st to endDay
211222346%8%68%
2431
June1st to 10thDay
11121346%8%72%
2340
11th to 20thDay
321242445%8%65%
2340
21st to endDay
321232447%10%60%
2261
July1st to 10thDay
5%226%5%46%6%7%10%48%
2160
11th to 20thDay
42134246%6%10%58%
2160
21st to endDay
3214426%6%7%12%52%
2349
August1st to 10thDay
32123235%7%11%61%
2149
11th to 20thDay
6%315%6%36%6%8%11%46%
2123
21st to endDay
42245%347%7%11%51%
2376
September1st to 10thDay
5%5%25%435%6%7%10%47%
2160
11th to 20thDay
8%5%24435%5%5%8%52%
2034
21st to endDay
5%3143245%5%7%61%
1980
October1st to 10thDay
331222246%8%68%
1980
11th to 20thDay
7%21332246%6%64%
1908
21st to endDay
6%21221223474%
1980
November1st to 10thDay
5%212212336%73%
1825
11th to 20thDay
4312322347%69%
1710
21st to endDay
6%313323346%65%
1710
December1st to 10thDay
6%423423337%62%
1710
11th to 20thDay
2425%4345%5%8%57%
2161
21st to endDay
321332345%7%66%
3331
January1st to 10thNight
3212212235%77%
3788
11th to 20thNight
5%12112345%76%
3800
21st to endNight
7%42442445%7%57%
4180
February1st to 10thNight
5%323423446%65%
2280
11th to 20thNight
5%324424447%61%
2218
21st to endNight
5%31332445%6%66%
1884
March1st to 10thNight
432443446%7%60%
2250
11th to 20thNight
6%5%2422445%6%60%
2062
21st to endNight
3313322446%69%
1988
April1st to 10thNight
432332445%6%64%
1800
11th to 20thNight
3212333447%68%
1777
21st to endNight
3212333445%70%
1800
May1st to 10thNight
421342435%8%65%
1800
11th to 20thNight
5%2135%345%5%8%59%
1770
21st to endNight
3314436%5%6%8%59%
1837
June1st to 10thNight
2112425%5%8%11%58%
1620
11th to 20thNight
32135%45%5%8%11%54%
1620
21st to endNight
3314335%5%7%11%56%
1691
July1st to 10thNight
33245%46%7%9%12%44%
1800
11th to 20thNight
31133335%7%11%60%
1800
21st to endNight
2313437%7%7%11%52%
1969
August1st to 10thNight
2213435%5%9%13%54%
1790
11th to 20thNight
4314445%8%8%12%46%
1778
21st to endNight
43245%45%8%9%11%44%
1980
September1st to 10thNight
5%3245%35%6%7%11%50%
1800
11th to 20thNight
6%326%5%46%6%7%10%45%
1925
21st to endNight
5%5%245%35%6%6%10%51%
1980
October1st to 10thNight
42133245%5%8%62%
1980
11th to 20thNight
7%21342345%7%63%
2047
21st to endNight
5%312222235%74%
2376
November1st to 10thNight
6%212212335%75%
2231
11th to 20thNight
4212323446%70%
2470
21st to endNight
5%31332335%6%66%
2470
December1st to 10thNight
5%22333345%7%62%
2470
11th to 20thNight
341432445%7%63%
3036
21st to endNight
331332346%8%64%
4363

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
14%3414%30%35%
3168
11th to 20thDay
14%26%14%39%25%
3170
21st to endDay
23%5%6%22%32%12%
3487
February1st to 10thDay
22%35%14%25%31%
1900
11th to 20thDay
23%47%13%23%29%
1859
21st to endDay
16%5%5%12%27%35%
1570
March1st to 10thDay
23%5%6%17%24%26%
1870
11th to 20thDay
24%5%6%12%21%31%
1894
21st to endDay
16%35%11%27%38%
2366
April1st to 10thDay
17%5%6%12%24%36%
2160
11th to 20thDay
14%46%13%23%40%
2134
21st to endDay
16%35%12%24%40%
2160
May1st to 10thDay
16%46%12%23%39%
2160
11th to 20thDay
16%5%8%18%26%26%
2128
21st to endDay
13%6%9%20%24%27%
2431
June1st to 10thDay
9%6%11%25%29%20%
2340
11th to 20thDay
17%5%9%17%30%22%
2340
21st to endDay
18%7%14%22%23%16%
2261
July1st to 10thDay
28%12%16%23%15%5%
2101
11th to 20thDay
19%7%13%26%24%11%
2097
21st to endDay
18%9%20%32%17%3
2219
August1st to 10thDay
15%7%15%32%24%7%
2136
11th to 20thDay
28%11%16%24%17%4
2123
21st to endDay
23%11%18%23%16%8%
2376
September1st to 10thDay
30%10%16%19%15%10%
2160
11th to 20thDay
29%8%13%18%22%9%
2034
21st to endDay
22%8%11%21%26%13%
1980
October1st to 10thDay
14%8%12%25%22%18%
1980
11th to 20thDay
21%6%9%20%20%25%
1908
21st to endDay
16%35%16%31%29%
1980
November1st to 10thDay
15%48%19%31%23%
1825
11th to 20thDay
17%48%21%29%21%
1710
21st to endDay
21%47%22%24%22%
1710
December1st to 10thDay
24%48%19%29%16%
1710
11th to 20thDay
24%6%6%19%29%16%
2159
21st to endDay
16%5%5%14%34%25%
3331
January1st to 10thNight
13%3310%36%35%
3788
11th to 20thNight
12%36%13%30%35%
3800
21st to endNight
25%6%6%17%31%15%
4180
February1st to 10thNight
21%36%14%25%31%
2280
11th to 20thNight
23%5%8%14%21%30%
2218
21st to endNight
19%5%6%10%27%34%
1884
March1st to 10thNight
24%5%6%16%23%26%
2250
11th to 20thNight
24%6%7%12%20%31%
2062
21st to endNight
17%47%13%22%37%
1988
April1st to 10thNight
21%6%6%13%21%34%
1800
11th to 20thNight
15%5%9%15%19%37%
1777
21st to endNight
15%5%8%16%22%34%
1800
May1st to 10thNight
17%5%9%15%20%34%
1800
11th to 20thNight
22%9%9%19%21%20%
1771
21st to endNight
21%8%12%21%17%21%
1838
June1st to 10thNight
16%7%14%28%22%13%
1620
11th to 20thNight
21%9%11%17%27%15%
1620
21st to endNight
20%8%15%21%21%15%
1691
July1st to 10thNight
27%12%21%26%12%3
1750
11th to 20thNight
16%7%14%29%26%9%
1740
21st to endNight
20%9%17%34%18%1
1859
August1st to 10thNight
17%7%16%31%24%5%
1779
11th to 20thNight
24%11%20%29%15%2
1778
21st to endNight
27%13%15%22%16%7%
1980
September1st to 10thNight
27%10%17%25%13%9%
1800
11th to 20thNight
30%11%16%18%18%7%
1925
21st to endNight
25%9%14%22%18%13%
1980
October1st to 10thNight
18%8%14%24%18%18%
1980
11th to 20thNight
22%6%9%20%20%24%
2047
21st to endNight
17%25%16%28%31%
2376
November1st to 10thNight
14%47%17%32%26%
2231
11th to 20thNight
16%5%7%19%26%26%
2470
21st to endNight
20%5%10%15%23%27%
2470
December1st to 10thNight
21%6%8%20%26%19%
2470
11th to 20thNight
20%5%8%19%27%21%
3037
21st to endNight
17%5%6%13%34%24%
4363

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
10%6%30%37%16%1
270
11th to 20thDay
5%9%22%44%18%2
270
21st to endDay
415%28%33%18%2
297
February1st to 10thDay
7%11%24%33%23%3
270
11th to 20thDay
10%13%24%36%16%2
270
21st to endDay
7%15%35%34%8%2
225
March1st to 10thDay
7%7%32%39%15%1
261
11th to 20thDay
6%15%35%30%10%5%
334
21st to endDay
6%16%33%32%10%1
462
April1st to 10thDay
5%14%38%33%9%1
420
11th to 20thDay
316%41%30%8%2
412
21st to endDay
8%13%35%35%8%1
420
May1st to 10thDay
49%35%37%13%3
423
11th to 20thDay
37%34%37%18%2
448
21st to endDay
25%25%45%22%1
579
June1st to 10thDay
2215%39%37%5%
630
11th to 20thDay
3111%38%42%6%
630
21st to endDay
3210%35%42%8%
551
July1st to 10thDay
418%29%37%21%
446
11th to 20thDay
25%35%41%15%
444
21st to endDay
26%36%42%14%
487
August1st to 10thDay
4325%48%19%
447
11th to 20thDay
418%27%40%21%
437
21st to endDay
317%30%38%21%
495
September1st to 10thDay
6%17%34%38%15%
450
11th to 20thDay
6%5%22%48%19%
324
21st to endDay
9%9%20%43%19%
270
October1st to 10thDay
5%310%27%42%14%
270
11th to 20thDay
10%210%31%33%13%
270
21st to endDay
9%5%15%27%33%11%
297
November1st to 10thDay
7%315%33%32%10%
270
11th to 20thDay
8%7%20%26%31%9%
270
21st to endDay
7%11%23%32%23%4
270
December1st to 10thDay
9%5%16%34%30%6%
270
11th to 20thDay
5%9%28%37%19%2
270
21st to endDay
47%23%45%19%1
297
January1st to 10thNight
7%221%52%17%1
760
11th to 20thNight
9%418%48%20%1
760
21st to endNight
6%6%25%48%14%1
836
February1st to 10thNight
6%6%26%43%18%1
760
11th to 20thNight
6%5%25%53%11%1
744
21st to endNight
6%7%31%49%7%
628
March1st to 10thNight
7%6%34%41%11%1
750
11th to 20thNight
10%6%28%42%15%1
720
21st to endNight
48%35%42%11%
602
April1st to 10thNight
48%32%47%9%
540
11th to 20thNight
38%38%44%7%
533
21st to endNight
48%36%45%7%
540
May1st to 10thNight
4430%52%10%1
540
11th to 20thNight
5%6%28%50%11%
531
21st to endNight
3228%52%14%
584
June1st to 10thNight
2218%56%21%1
540
11th to 20thNight
2116%59%22%
540
21st to endNight
4111%50%34%1
540
July1st to 10thNight
5%110%44%38%2
525
11th to 20thNight
35%47%43%2
522
21st to endNight
316%39%49%2
591
August1st to 10thNight
215%32%59%2
537
11th to 20thNight
415%30%55%4
534
21st to endNight
416%36%52%3
594
September1st to 10thNight
5%25%36%49%2
540
11th to 20thNight
7%110%37%44%1
540
21st to endNight
6%111%40%40%2
540
October1st to 10thNight
4113%45%36%1
540
11th to 20thNight
8%115%49%25%3
607
21st to endNight
5%414%41%32%4
792
November1st to 10thNight
7%110%44%33%3
751
11th to 20thNight
4414%49%27%2
950
21st to endNight
6%424%43%20%2
950
December1st to 10thNight
7%315%50%23%2
950
11th to 20thNight
5%423%50%17%1
950
21st to endNight
5%422%51%16%1
941
Page generated at 2024-03-05 06:23:58. Version ac07

Copyright © 2024 Attilla Danko.


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