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 2017-03-19.

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
70%
14765
32%
45326
26%
14724
76%
14724
46%
23014

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
68%
716
35%
2148
27%
716
75%
716
44%
1126
January16th to endNight
65%
768
36%
2304
29%
768
71%
768
45%
1197
February1st to 15thNight
65%
701
36%
2108
25%
696
76%
696
53%
1003
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%
604
34%
1864
23%
604
68%
604
47%
915
April1st to 15thNight
54%
494
39%
1648
25%
494
72%
494
47%
770
April16th to endNight
53%
495
34%
1650
26%
495
69%
495
51%
728
May1st to 15thNight
54%
494
29%
1649
24%
494
68%
494
44%
808
May16th to endNight
65%
513
25%
1648
27%
513
70%
513
40%
872
June1st to 15thNight
76%
495
28%
1485
27%
495
81%
495
54%
723
June16th to endNight
80%
495
21%
1528
23%
495
82%
495
42%
819
July1st to 15thNight
79%
465
20%
1550
25%
465
80%
465
37%
836
July16th to endNight
82%
522
24%
1631
28%
489
84%
489
37%
886
August1st to 15thNight
85%
494
28%
1639
34%
491
86%
491
43%
813
August16th to endNight
79%
525
21%
1750
25%
525
80%
525
30%
1039
September1st to 15thNight
78%
495
21%
1672
23%
495
80%
495
30%
980
September16th to endNight
71%
492
24%
1815
27%
492
72%
492
29%
1014
October1st to 15thNight
79%
495
35%
1815
38%
495
82%
495
46%
818
October16th to endNight
76%
690
39%
2098
30%
690
80%
690
57%
956
November1st to 15thNight
79%
766
38%
2166
27%
766
83%
766
63%
993
November16th to endNight
73%
900
38%
2340
23%
900
79%
900
60%
1182
December1st to 15thNight
74%
900
36%
2340
26%
900
76%
900
53%
1278
December16th to endNight
66%
894
37%
2430
25%
894
73%
894
51%
1277

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%61%
45452
Night
421332445%7%60%
45550
Cloud CoverDay
431332345%7%61%
45450
Night
431332445%7%59%
45550
TransparencyDay
20%5%9%18%25%20%
45172
Night
21%5%10%18%23%21%
45332
SeeingDay
4418%34%28%9%
4364
Night
4217%46%27%1
14775

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%57%
1790
16th to endDay
5%323313335%64%
1920
February1st to 15thDay
2212322335%69%
1750
16th to endDay
3212213345%71%
1580
March1st to 15thDay
231231435%6%63%
1803
16th to endDay
433213336%66%
2089
April1st to 15thDay
121231335%6%67%
1970
16th to endDay
221221233473%
1980
May1st to 15thDay
1213323348%66%
1971
16th to endDay
211121336%6%67%
2109
June1st to 15thDay
1121435%6%71%
2145
16th to endDay
321332447%11%55%
2096
July1st to 15thDay
5%2145%35%6%5%9%50%
1980
16th to endDay
5%214426%6%7%11%45%
2109
August1st to 15thDay
431243447%11%53%
1980
16th to endDay
6%2145%246%7%11%46%
2100
September1st to 15thDay
6%5%25%435%6%6%10%42%
1958
16th to endDay
7%3144145%47%54%
1815
October1st to 15thDay
32221236%7%67%
1815
16th to endDay
411121133472%
1771
November1st to 15thDay
4212211235%71%
1678
16th to endDay
4212212235%70%
1620
December1st to 15thDay
4423323236%61%
1620
16th to endDay
3313323446%62%
1803
January1st to 15thNight
6%213323346%60%
2148
16th to endNight
7%21421345%6%59%
2304
February1st to 15thNight
221232233469%
2102
16th to endNight
312224446%67%
1894
March1st to 15thNight
331331335%6%62%
2154
16th to endNight
3414312346%65%
1864
April1st to 15thNight
2212324446%65%
1648
16th to endNight
221222333470%
1650
May1st to 15thNight
411342435%7%60%
1649
16th to endNight
3213425%5%6%8%55%
1647
June1st to 15thNight
1124245%7%11%58%
1485
16th to endNight
3113335%5%7%11%52%
1528
July1st to 15thNight
2213435%7%9%10%48%
1650
16th to endNight
4213427%7%7%11%46%
1751
August1st to 15thNight
3212335%6%10%14%48%
1650
16th to endNight
3315%5%5%5%8%10%11%39%
1750
September1st to 15thNight
3225%5%36%6%7%12%44%
1672
16th to endNight
7%4145%346%6%9%45%
1815
October1st to 15thNight
41221345%7%63%
1815
16th to endNight
312212235%72%
2098
November1st to 15thNight
411211335%74%
2166
16th to endNight
41121223472%
2340
December1st to 15thNight
4213322447%62%
2340
16th to endNight
3313323445%64%
2430

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%
1790
16th to endDay
5%42231333464%
1920
February1st to 15thDay
221332323469%
1750
16th to endDay
3212213345%70%
1580
March1st to 15thDay
3312423445%63%
1803
16th to endDay
4312313336%65%
2087
April1st to 15thDay
2213222446%67%
1970
16th to endDay
3112213335%72%
1980
May1st to 15thDay
2213314347%66%
1971
16th to endDay
21221345%7%67%
2109
June1st to 15thDay
111223446%70%
2145
16th to endDay
32133245%6%11%55%
2096
July1st to 15thDay
5%314425%5%6%8%50%
1980
16th to endDay
5%213436%6%7%11%45%
2109
August1st to 15thDay
421343447%11%52%
1980
16th to endDay
5%315%5%26%6%7%11%45%
2100
September1st to 15thDay
7%6%25%436%5%7%9%42%
1958
16th to endDay
8%31443345%6%54%
1815
October1st to 15thDay
32221245%8%65%
1815
16th to endDay
5%11121223472%
1771
November1st to 15thDay
5%3121123472%
1678
16th to endDay
431221233470%
1620
December1st to 15thDay
4414314336%61%
1620
16th to endDay
2413334346%63%
1803
January1st to 15thNight
7%214313346%60%
2148
16th to endNight
7%22322435%6%59%
2304
February1st to 15thNight
321331333468%
2102
16th to endNight
3211224447%65%
1894
March1st to 15thNight
5%413324347%60%
2154
16th to endNight
4313312436%64%
1864
April1st to 15thNight
221222445%6%64%
1648
16th to endNight
221222244470%
1650
May1st to 15thNight
4313423447%60%
1649
16th to endNight
4213325%6%6%8%55%
1647
June1st to 15thNight
11123245%8%11%56%
1485
16th to endNight
3213436%5%7%10%52%
1528
July1st to 15thNight
3213436%7%8%10%48%
1650
16th to endNight
4213436%7%7%10%46%
1751
August1st to 15thNight
4212325%7%10%13%47%
1650
16th to endNight
43145%37%8%10%10%38%
1750
September1st to 15thNight
4325%5%25%6%8%12%43%
1672
16th to endNight
7%4244345%7%8%45%
1815
October1st to 15thNight
5%2222345%7%62%
1815
16th to endNight
3212212236%71%
2098
November1st to 15thNight
3112211236%73%
2166
16th to endNight
421221223472%
2340
December1st to 15thNight
4413323337%62%
2340
16th to endNight
3413324345%64%
2430

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%45%20%29%13%
1791
16th to endDay
22%27%17%34%15%
1920
February1st to 15thDay
18%35%13%26%31%
1751
16th to endDay
15%35%13%34%28%
1580
March1st to 15thDay
19%37%16%23%29%
1803
16th to endDay
20%26%12%26%32%
2089
April1st to 15thDay
16%46%11%24%37%
1970
16th to endDay
14%26%8%21%45%
1980
May1st to 15thDay
17%37%14%23%33%
1971
16th to endDay
15%48%18%24%28%
2112
June1st to 15thDay
12%38%20%30%25%
2145
16th to endDay
20%7%14%21%22%13%
2096
July1st to 15thDay
27%8%13%22%21%7%
1851
16th to endDay
25%8%18%28%15%3
1966
August1st to 15thDay
22%7%14%29%22%4
1967
16th to endDay
27%9%17%23%16%5%
2100
September1st to 15thDay
33%9%17%19%14%5%
1958
16th to endDay
27%6%12%19%22%11%
1815
October1st to 15thDay
15%5%12%24%23%18%
1815
16th to endDay
15%26%16%28%29%
1771
November1st to 15thDay
16%27%19%31%21%
1678
16th to endDay
17%37%16%26%27%
1620
December1st to 15thDay
24%28%18%30%15%
1620
16th to endDay
21%46%22%33%11%
1803
January1st to 15thNight
24%46%16%31%17%
2148
16th to endNight
24%36%15%32%18%
2304
February1st to 15thNight
18%26%11%24%34%
2112
16th to endNight
16%37%12%29%29%
1894
March1st to 15thNight
21%35%14%23%31%
2154
16th to endNight
21%37%13%21%32%
1864
April1st to 15thNight
19%47%12%19%37%
1648
16th to endNight
16%36%15%17%40%
1650
May1st to 15thNight
21%48%16%18%29%
1650
16th to endNight
23%7%9%19%17%21%
1649
June1st to 15thNight
16%6%12%23%26%15%
1485
16th to endNight
23%7%15%21%20%11%
1528
July1st to 15thNight
23%10%18%25%17%5%
1550
16th to endNight
24%9%16%30%15%3
1631
August1st to 15thNight
19%9%17%28%22%3
1639
16th to endNight
30%10%15%24%14%4
1750
September1st to 15thNight
29%10%20%22%10%5%
1672
16th to endNight
31%7%14%18%16%11%
1815
October1st to 15thNight
17%6%13%24%19%18%
1815
16th to endNight
16%2417%25%32%
2098
November1st to 15thNight
12%38%17%32%25%
2166
16th to endNight
16%37%13%23%35%
2340
December1st to 15thNight
21%48%20%26%20%
2340
16th to endNight
20%35%18%32%18%
2430

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
13%220%38%23%2
90
16th to endDay
412%25%34%20%3
96
February1st to 15thDay
27%10%34%34%11%
90
16th to endDay
11%8%14%33%25%6%
81
March1st to 15thDay
4419%39%27%4
93
16th to endDay
410%35%32%12%4
238
April1st to 15thDay
5%17%39%26%9%1
209
16th to endDay
312%40%35%6%1
210
May1st to 15thDay
214%40%35%6%
228
16th to endDay
2329%43%18%1
324
June1st to 15thDay
114%34%39%8%
420
16th to endDay
212%35%42%6%
371
July1st to 15thDay
48%37%30%17%
245
16th to endDay
47%36%33%17%
271
August1st to 15thDay
4230%43%18%
255
16th to endDay
5%10%38%33%13%
268
September1st to 15thDay
410%34%31%18%
233
16th to endDay
11%5%16%42%24%
90
October1st to 15thDay
8%18%22%38%20%
90
16th to endDay
219%28%33%26%
96
November1st to 15thDay
6%216%37%30%6%
90
16th to endDay
10%10%17%25%33%3
90
December1st to 15thDay
7%6%7%24%41%12%
90
16th to endDay
6%6%25%36%25%1
96
January1st to 15thNight
8%16%53%20%1
720
16th to endNight
7%318%50%20%
768
February1st to 15thNight
3422%47%21%
704
16th to endNight
3224%57%11%
632
March1st to 15thNight
8%325%45%16%
720
16th to endNight
6%327%45%17%
604
April1st to 15thNight
26%34%47%8%
494
16th to endNight
36%35%47%8%
495
May1st to 15thNight
4432%49%7%
495
16th to endNight
4123%53%16%
515
June1st to 15thNight
117%58%21%
495
16th to endNight
310%52%33%
495
July1st to 15thNight
37%46%40%1
465
16th to endNight
4437%50%1
522
August1st to 15thNight
3327%62%2
494
16th to endNight
3436%51%3
525
September1st to 15thNight
317%31%53%2
495
16th to endNight
8%9%39%40%1
492
October1st to 15thNight
5%10%46%35%1
495
16th to endNight
4112%40%36%4
690
November1st to 15thNight
411%45%32%4
766
16th to endNight
4216%45%29%2
900
December1st to 15thNight
6%213%49%26%1
900
16th to endNight
4319%51%18%1
894
Page generated at 2017-03-20 07:18:29. Version ac04

Copyright 2017 A. Danko


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