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 2005-11-05 to 2018-02-13.

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%
15915
32%
48892
27%
15874
77%
15874
47%
24674

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
69%
776
36%
2328
28%
776
76%
776
45%
1207
January16th to endNight
67%
832
36%
2496
30%
832
73%
832
46%
1275
February1st to 15thNight
65%
749
35%
2252
25%
744
76%
744
52%
1079
February16th to endNight
65%
632
35%
1894
25%
632
74%
632
55%
894
March1st to 15thNight
59%
720
34%
2154
22%
720
69%
720
48%
1087
March16th to endNight
57%
641
37%
1985
25%
641
70%
641
49%
952
April1st to 15thNight
54%
539
37%
1798
23%
539
72%
539
47%
832
April16th to endNight
54%
540
36%
1800
27%
540
70%
540
52%
791
May1st to 15thNight
55%
539
28%
1799
23%
539
68%
539
46%
858
May16th to endNight
65%
561
26%
1802
28%
561
71%
561
40%
954
June1st to 15thNight
77%
540
26%
1620
25%
540
81%
540
54%
786
June16th to endNight
80%
540
25%
1667
26%
540
82%
540
44%
870
July1st to 15thNight
80%
510
19%
1700
23%
510
81%
510
37%
909
July16th to endNight
82%
564
25%
1771
30%
531
84%
531
38%
951
August1st to 15thNight
85%
539
26%
1789
32%
536
85%
536
42%
900
August16th to endNight
80%
573
22%
1910
26%
573
80%
573
30%
1125
September1st to 15thNight
79%
540
21%
1824
23%
540
81%
540
32%
1044
September16th to endNight
70%
537
25%
1980
28%
537
72%
537
28%
1122
October1st to 15thNight
80%
540
34%
1980
37%
540
83%
540
46%
892
October16th to endNight
77%
753
41%
2289
32%
753
81%
753
59%
1031
November1st to 15thNight
80%
832
37%
2352
26%
832
83%
832
64%
1073
November16th to endNight
74%
975
40%
2535
25%
975
80%
975
62%
1259
December1st to 15thNight
74%
975
35%
2535
26%
975
76%
975
51%
1401
December16th to endNight
67%
968
38%
2632
26%
968
74%
968
51%
1382

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
421332345%7%62%
49105
Night
321332445%7%60%
49116
Cloud CoverDay
431332345%7%62%
49103
Night
421332445%7%60%
49116
TransparencyDay
20%5%9%19%25%20%
48825
Night
20%5%10%18%23%21%
48898
SeeingDay
4417%32%29%11%
5556
Night
4216%46%28%1
15925

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%42332235%5%58%
1940
16th to endDay
5%313313335%66%
2080
February1st to 15thDay
2212323345%68%
1870
16th to endDay
3212213345%71%
1580
March1st to 15thDay
231231435%6%63%
1803
16th to endDay
422213335%68%
2238
April1st to 15thDay
221221335%6%68%
2150
16th to endDay
221221233473%
2160
May1st to 15thDay
123323338%67%
2151
16th to endDay
211121336%7%67%
2306
June1st to 15thDay
1121435%6%71%
2340
16th to endDay
321232446%11%58%
2286
July1st to 15thDay
5%2145%35%6%5%9%50%
2160
16th to endDay
5%213436%6%7%11%45%
2277
August1st to 15thDay
4313435%47%11%52%
2160
16th to endDay
5%2145%246%7%11%47%
2292
September1st to 15thDay
6%425%435%6%6%9%44%
2136
16th to endDay
8%3144245%47%52%
1980
October1st to 15thDay
32221236%7%66%
1980
16th to endDay
411121133473%
1932
November1st to 15thDay
4212211236%72%
1821
16th to endDay
4212212225%71%
1755
December1st to 15thDay
4423323236%61%
1755
16th to endDay
331332345%6%62%
1953
January1st to 15thNight
6%213323346%61%
2328
16th to endNight
6%21321345%6%61%
2496
February1st to 15thNight
2212323335%67%
2246
16th to endNight
312224446%67%
1894
March1st to 15thNight
331331335%6%62%
2154
16th to endNight
3313212346%66%
1985
April1st to 15thNight
3212323446%65%
1798
16th to endNight
221122233471%
1800
May1st to 15thNight
4112423347%63%
1799
16th to endNight
3213425%5%6%9%56%
1801
June1st to 15thNight
1123245%8%11%58%
1620
16th to endNight
2113335%47%11%54%
1667
July1st to 15thNight
2213435%7%9%11%48%
1800
16th to endNight
3213427%7%7%11%47%
1891
August1st to 15thNight
3212335%6%10%14%47%
1800
16th to endNight
3215%5%5%6%8%10%11%40%
1910
September1st to 15thNight
32245%36%6%7%11%46%
1824
16th to endNight
7%5%145%35%6%6%9%44%
1980
October1st to 15thNight
41221345%7%63%
1980
16th to endNight
312212235%73%
2289
November1st to 15thNight
311211335%74%
2352
16th to endNight
41121223474%
2535
December1st to 15thNight
4213323447%61%
2535
16th to endNight
3313313445%64%
2632

Percentage Cloud Cover SE (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%5%23323235%59%
1940
16th to endDay
442231333466%
2080
February1st to 15thDay
221332333468%
1870
16th to endDay
3212213345%70%
1580
March1st to 15thDay
3312423445%63%
1803
16th to endDay
3312212336%67%
2236
April1st to 15thDay
221222235%6%68%
2150
16th to endDay
2112213335%73%
2160
May1st to 15thDay
1213313337%68%
2151
16th to endDay
31221345%7%67%
2306
June1st to 15thDay
11223447%69%
2340
16th to endDay
311332446%11%57%
2286
July1st to 15thDay
5%3144245%6%8%50%
2160
16th to endDay
5%323436%6%7%11%45%
2277
August1st to 15thDay
421343447%11%51%
2160
16th to endDay
5%315%5%25%6%7%11%45%
2292
September1st to 15thDay
7%5%24436%5%7%8%44%
2136
16th to endDay
9%41443345%6%52%
1980
October1st to 15thDay
32221245%8%65%
1980
16th to endDay
41221233473%
1932
November1st to 15thDay
43121123473%
1821
16th to endDay
421221223471%
1755
December1st to 15thDay
5%414314336%61%
1755
16th to endDay
241333435%6%62%
1953
January1st to 15thNight
6%214313346%60%
2328
16th to endNight
6%22322435%5%61%
2496
February1st to 15thNight
3314313335%67%
2246
16th to endNight
3211224447%65%
1894
March1st to 15thNight
5%413324347%60%
2154
16th to endNight
3313312436%65%
1985
April1st to 15thNight
231222445%6%65%
1798
16th to endNight
221222344470%
1800
May1st to 15thNight
4313323447%62%
1799
16th to endNight
4213325%5%6%8%55%
1801
June1st to 15thNight
1123245%8%12%57%
1620
16th to endNight
223335%5%7%11%54%
1667
July1st to 15thNight
3213436%7%8%11%47%
1800
16th to endNight
4213436%7%7%10%47%
1891
August1st to 15thNight
3213435%7%10%13%46%
1800
16th to endNight
33146%37%8%10%11%39%
1910
September1st to 15thNight
3325%5%25%5%8%11%45%
1824
16th to endNight
8%424435%5%6%9%44%
1980
October1st to 15thNight
5%2222345%7%62%
1980
16th to endNight
3212212235%72%
2289
November1st to 15thNight
312211236%73%
2352
16th to endNight
411121223473%
2535
December1st to 15thNight
4313323347%60%
2535
16th to endNight
3413324345%64%
2632

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%35%20%30%12%
1941
16th to endDay
21%27%17%36%14%
2080
February1st to 15thDay
19%36%14%25%29%
1871
16th to endDay
15%35%13%34%28%
1580
March1st to 15thDay
19%37%16%23%29%
1803
16th to endDay
19%26%11%25%35%
2238
April1st to 15thDay
15%46%11%24%36%
2150
16th to endDay
14%25%9%22%44%
2160
May1st to 15thDay
16%36%13%23%35%
2151
16th to endDay
15%5%8%18%23%28%
2309
June1st to 15thDay
11%39%21%30%23%
2340
16th to endDay
18%6%14%21%23%14%
2286
July1st to 15thDay
26%7%14%23%20%6%
2031
16th to endDay
24%9%18%28%15%3
2134
August1st to 15thDay
22%8%15%28%20%3
2147
16th to endDay
26%9%18%22%15%6%
2292
September1st to 15thDay
31%9%16%20%16%6%
2136
16th to endDay
29%6%12%19%21%10%
1980
October1st to 15thDay
15%5%13%24%22%18%
1980
16th to endDay
15%26%16%29%30%
1932
November1st to 15thDay
16%27%23%29%20%
1821
16th to endDay
16%37%17%29%26%
1755
December1st to 15thDay
25%28%18%30%14%
1755
16th to endDay
21%46%22%32%12%
1953
January1st to 15thNight
23%36%15%33%16%
2328
16th to endNight
23%35%14%33%19%
2496
February1st to 15thNight
18%37%13%24%33%
2256
16th to endNight
16%37%12%29%29%
1894
March1st to 15thNight
21%35%14%23%31%
2154
16th to endNight
19%37%13%22%33%
1985
April1st to 15thNight
18%47%12%20%37%
1798
16th to endNight
16%36%15%18%39%
1800
May1st to 15thNight
20%48%16%19%30%
1800
16th to endNight
23%7%9%18%17%22%
1803
June1st to 15thNight
15%6%12%24%26%14%
1620
16th to endNight
21%6%14%20%22%13%
1667
July1st to 15thNight
23%10%18%26%16%4
1700
16th to endNight
23%9%17%31%15%3
1771
August1st to 15thNight
19%9%18%28%21%2
1789
16th to endNight
30%10%16%23%13%4
1910
September1st to 15thNight
28%10%19%22%11%7%
1824
16th to endNight
32%7%14%18%15%10%
1980
October1st to 15thNight
17%6%13%25%18%17%
1980
16th to endNight
15%2417%26%33%
2289
November1st to 15thNight
12%38%20%31%23%
2352
16th to endNight
15%27%13%26%34%
2535
December1st to 15thNight
22%47%19%26%18%
2535
16th to endNight
20%35%18%33%18%
2632

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
11%317%36%27%3
135
16th to endDay
29%20%34%27%4
144
February1st to 15thDay
27%11%30%38%8%
126
16th to endDay
11%8%14%33%25%6%
81
March1st to 15thDay
4419%39%27%4
93
16th to endDay
411%34%31%13%5%
288
April1st to 15thDay
415%39%28%10%1
269
16th to endDay
311%37%33%10%3
270
May1st to 15thDay
213%38%35%8%1
288
16th to endDay
3429%42%19%1
393
June1st to 15thDay
1212%34%41%8%
495
16th to endDay
210%34%42%9%
441
July1st to 15thDay
5%7%34%30%21%
305
16th to endDay
46%34%33%20%
327
August1st to 15thDay
4327%41%22%
315
16th to endDay
48%35%34%17%
332
September1st to 15thDay
49%33%34%17%
291
16th to endDay
10%26%22%36%21%
135
October1st to 15thDay
7%9%21%37%22%
135
16th to endDay
112%27%36%21%
144
November1st to 15thDay
5%211%28%37%14%
135
16th to endDay
6%7%14%21%37%12%
135
December1st to 15thDay
10%5%12%25%34%10%
135
16th to endDay
46%20%37%26%4
144
January1st to 15thNight
7%115%53%20%1
780
16th to endNight
7%317%50%21%
832
February1st to 15thNight
3321%47%22%
752
16th to endNight
3224%57%11%
632
March1st to 15thNight
8%325%45%16%
720
16th to endNight
5%427%45%17%
641
April1st to 15thNight
26%33%47%9%
539
16th to endNight
35%34%47%8%
540
May1st to 15thNight
4433%49%7%
540
16th to endNight
4223%53%15%
563
June1st to 15thNight
16%59%22%
540
16th to endNight
210%50%36%
540
July1st to 15thNight
37%46%40%1
510
16th to endNight
4436%51%2
564
August1st to 15thNight
3226%63%3
539
16th to endNight
3434%53%3
573
September1st to 15thNight
217%31%54%2
540
16th to endNight
8%10%40%38%1
537
October1st to 15thNight
5%10%45%37%1
540
16th to endNight
3111%40%36%5%
753
November1st to 15thNight
4111%44%35%3
832
16th to endNight
4215%44%30%2
975
December1st to 15thNight
6%213%49%25%1
975
16th to endNight
4318%51%19%1
968
Page generated at 2018-02-13 19:46:04. Version ac04

Copyright 2018 A. Danko


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