Bull Domingo Astro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bull Domingo Astro clear sky chart from 2005-11-06 to 2024-01-11.

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
45%
24444
29%
74425
14%
24389
60%
24389
41%
37931

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
36%
950
32%
2647
12%
946
55%
946
45%
1276
January11th to 20thNight
34%
783
36%
2411
17%
783
55%
783
44%
1113
January21st to endNight
35%
792
35%
2574
16%
792
58%
792
46%
1171
February1st to 10thNight
25%
720
30%
2340
10%
720
50%
720
42%
1110
February11th to 20thNight
26%
701
31%
2101
10%
700
47%
700
39%
1080
February21st to endNight
25%
592
38%
1776
8%
592
55%
592
42%
874
March1st to 10thNight
31%
720
29%
2147
9%
720
50%
720
43%
1032
March11th to 20thNight
41%
720
28%
1980
13%
720
52%
720
44%
1078
March21st to endNight
32%
678
34%
2064
11%
678
56%
678
41%
1039
April1st to 10thNight
31%
540
29%
1800
11%
540
53%
540
40%
838
April11th to 20thNight
32%
533
26%
1777
13%
533
50%
533
31%
933
April21st to endNight
38%
540
25%
1800
11%
540
57%
540
31%
958
May1st to 10thNight
42%
540
25%
1764
16%
540
56%
540
33%
957
May11th to 20thNight
49%
531
16%
1464
10%
531
55%
531
30%
918
May21st to endNight
46%
583
22%
1552
10%
582
57%
582
38%
874
June1st to 10thNight
58%
540
25%
1440
15%
540
66%
540
41%
793
June11th to 20thNight
60%
540
28%
1440
18%
540
68%
540
52%
740
June21st to endNight
64%
540
23%
1440
16%
540
70%
540
41%
834
July1st to 10thNight
69%
525
17%
1400
15%
525
71%
525
30%
915
July11th to 20thNight
80%
522
20%
1392
17%
522
81%
522
41%
802
July21st to endNight
74%
591
11%
1634
11%
558
74%
558
23%
1106
August1st to 10thNight
70%
537
13%
1623
13%
534
71%
534
27%
993
August11th to 20thNight
73%
534
21%
1778
22%
534
76%
534
33%
1001
August21st to endNight
72%
594
22%
1980
23%
594
75%
594
33%
1111
September1st to 10thNight
69%
540
27%
1800
24%
540
75%
540
36%
962
September11th to 20thNight
62%
540
35%
1806
28%
540
74%
540
43%
892
September21st to endNight
57%
540
32%
1980
24%
540
70%
540
43%
891
October1st to 10thNight
54%
717
30%
2157
16%
717
65%
717
45%
1099
October11th to 20thNight
53%
720
39%
2160
18%
720
69%
720
63%
905
October21st to endNight
48%
792
38%
2376
17%
792
64%
792
50%
1146
November1st to 10thNight
46%
911
37%
2391
14%
911
61%
911
59%
1136
November11th to 20thNight
40%
950
40%
2470
14%
950
57%
950
56%
1199
November21st to endNight
42%
950
34%
2512
14%
950
56%
950
49%
1286
December1st to 10thNight
36%
950
31%
2660
12%
950
52%
950
47%
1310
December11th to 20thNight
30%
950
31%
3117
10%
949
48%
949
41%
1474
December21st to endNight
25%
1038
21%
4672
8%
1026
45%
1026
27%
2085

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
3424435%5%6%8%55%
74738
Night
242442445%8%62%
74973
TransparencyDay
25%7%13%23%23%10%
74451
Night
20%6%13%26%25%9%
74782
SeeingDay
9%13%29%27%16%5%
14275
Night
6%10%33%33%16%3
24455

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
132332445%8%67%
1518
11th to 20thDay
132342346%9%63%
1577
21st to endDay
435%32335%8%64%
1782
February1st to 10thDay
436%42336%8%61%
1620
11th to 20thDay
1325%4235%5%8%63%
1745
21st to endDay
15%36%5%24348%59%
1480
March1st to 10thDay
142442345%9%61%
1809
11th to 20thDay
26%35%425%5%6%7%53%
1980
21st to endDay
16%35%435%46%9%53%
2290
April1st to 10thDay
25%24425%5%6%8%56%
2160
11th to 20thDay
47%26%6%4446%7%50%
2131
21st to endDay
47%35%6%35%6%7%8%47%
2160
May1st to 10thDay
47%36%436%6%7%8%46%
2194
11th to 20thDay
6%6%36%5%46%6%7%9%42%
2428
21st to endDay
43235%45%6%6%10%51%
2724
June1st to 10thDay
3325%435%7%8%12%49%
2520
11th to 20thDay
3313435%6%7%9%57%
2520
21st to endDay
33236%36%8%8%10%49%
2520
July1st to 10thDay
5%425%5%46%6%7%10%47%
2520
11th to 20thDay
34247%47%7%7%10%44%
2520
21st to endDay
5%427%7%5%8%8%10%10%32%
2583
August1st to 10thDay
5%5%26%7%48%7%7%9%39%
2307
11th to 20thDay
44345%46%7%8%9%47%
2123
21st to endDay
5%4245%45%7%7%9%49%
2376
September1st to 10thDay
44245%35%5%7%8%53%
2160
11th to 20thDay
42134245%5%8%62%
2152
21st to endDay
4214423435%67%
1980
October1st to 10thDay
4324435%5%6%6%58%
1800
11th to 20thDay
2312213337%73%
1800
21st to endDay
35%23323346%67%
1973
November1st to 10thDay
1313212348%71%
1673
11th to 20thDay
313323348%70%
1710
21st to endDay
142441335%7%66%
1663
December1st to 10thDay
32332335%8%68%
1520
11th to 20thDay
122422236%10%64%
1926
21st to endDay
1326%43445%6%61%
2794
January1st to 10thNight
313423348%69%
2647
11th to 20thNight
1412323446%70%
2411
21st to endNight
323322448%67%
2574
February1st to 10thNight
1435%422247%66%
2340
11th to 20thNight
14244245%5%8%62%
2101
21st to endNight
425%42345%6%65%
1776
March1st to 10thNight
142322346%8%66%
2147
11th to 20thNight
25%2442446%8%60%
1980
21st to endNight
242332335%8%64%
2064
April1st to 10thNight
15%24323348%65%
1800
11th to 20thNight
47%35%423448%57%
1777
21st to endNight
46%35%4345%48%56%
1800
May1st to 10thNight
46%35%424447%56%
1764
11th to 20thNight
6%8%25%335%6%7%8%47%
1464
21st to endNight
6%41442445%9%57%
1552
June1st to 10thNight
33232245%7%8%60%
1440
11th to 20thNight
222222335%8%68%
1440
21st to endNight
32245%35%5%8%10%53%
1440
July1st to 10thNight
5%425%5%48%8%9%9%41%
1440
11th to 20thNight
4324435%6%8%10%51%
1440
21st to endNight
45%35%6%47%7%10%12%38%
1730
August1st to 10thNight
5%425%5%35%6%8%11%44%
1632
11th to 20thNight
4425%445%6%8%10%48%
1778
21st to endNight
4325%435%6%8%10%50%
1980
September1st to 10thNight
44245%35%5%6%9%52%
1800
11th to 20thNight
441332345%7%62%
1806
21st to endNight
4213423447%66%
1980
October1st to 10thNight
432332335%7%65%
2157
11th to 20thNight
1112213345%78%
2160
21st to endNight
35%13322346%68%
2376
November1st to 10thNight
1222212347%73%
2391
11th to 20thNight
1212313446%74%
2470
21st to endNight
15%2331325%7%67%
2512
December1st to 10thNight
22332335%8%68%
2660
11th to 20thNight
132431346%9%62%
3271
21st to endNight
325%5%3446%8%60%
4873

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
17%314%34%26%6%
1519
11th to 20thDay
18%415%30%25%8%
1577
21st to endDay
21%312%33%22%9%
1782
February1st to 10thDay
23%414%29%22%9%
1620
11th to 20thDay
19%5%11%27%29%10%
1755
21st to endDay
23%411%23%26%13%
1480
March1st to 10thDay
21%411%25%29%10%
1809
11th to 20thDay
27%5%13%25%23%7%
1980
21st to endDay
27%6%11%27%23%6%
2290
April1st to 10thDay
25%5%14%22%22%12%
2160
11th to 20thDay
33%5%10%25%20%8%
2134
21st to endDay
31%7%13%23%20%6%
2160
May1st to 10thDay
34%7%13%21%20%6%
2194
11th to 20thDay
36%10%15%21%15%4
2432
21st to endDay
26%8%13%20%21%11%
2724
June1st to 10thDay
24%10%14%22%20%10%
2520
11th to 20thDay
21%8%10%16%24%21%
2520
21st to endDay
26%9%14%19%20%12%
2520
July1st to 10thDay
30%10%13%16%20%11%
2451
11th to 20thDay
31%9%15%26%13%5%
2445
21st to endDay
38%14%21%19%8%1
2439
August1st to 10thDay
38%12%16%14%14%6%
2292
11th to 20thDay
31%9%12%21%19%8%
2123
21st to endDay
29%9%14%22%22%5%
2376
September1st to 10thDay
27%8%12%21%22%12%
2160
11th to 20thDay
20%6%12%18%28%15%
2152
21st to endDay
20%48%24%33%11%
1980
October1st to 10thDay
24%7%10%20%27%11%
1800
11th to 20thDay
14%210%19%39%15%
1800
21st to endDay
20%38%27%32%11%
1973
November1st to 10thDay
13%311%21%38%14%
1673
11th to 20thDay
14%410%32%32%9%
1710
21st to endDay
20%29%22%32%15%
1663
December1st to 10thDay
16%5%16%29%25%8%
1520
11th to 20thDay
16%5%15%27%28%9%
1924
21st to endDay
19%8%11%25%23%13%
2794
January1st to 10thNight
15%5%15%30%29%7%
2647
11th to 20thNight
16%412%30%31%7%
2411
21st to endNight
16%412%33%26%8%
2574
February1st to 10thNight
21%312%32%22%10%
2340
11th to 20thNight
22%5%12%28%26%8%
2101
21st to endNight
19%49%25%31%11%
1776
March1st to 10thNight
17%413%27%30%9%
2147
11th to 20thNight
21%6%12%30%24%5%
1980
21st to endNight
19%6%12%29%29%4
2064
April1st to 10thNight
19%5%14%27%26%9%
1800
11th to 20thNight
26%6%10%27%25%6%
1777
21st to endNight
27%6%13%29%19%6%
1800
May1st to 10thNight
28%6%12%28%20%6%
1764
11th to 20thNight
34%9%18%19%15%5%
1465
21st to endNight
25%7%15%23%20%11%
1552
June1st to 10thNight
22%8%18%21%18%13%
1440
11th to 20thNight
15%7%12%22%24%20%
1440
21st to endNight
25%8%13%19%21%13%
1440
July1st to 10thNight
33%13%14%15%16%9%
1400
11th to 20thNight
23%10%21%26%13%6%
1392
21st to endNight
34%18%23%18%7%1
1634
August1st to 10thNight
31%13%20%18%12%7%
1623
11th to 20thNight
29%9%18%24%14%6%
1778
21st to endNight
27%10%17%23%18%5%
1980
September1st to 10thNight
27%7%14%24%21%8%
1800
11th to 20thNight
20%7%12%21%25%15%
1806
21st to endNight
19%5%11%23%33%9%
1980
October1st to 10thNight
19%7%11%24%27%12%
2157
11th to 20thNight
10%310%21%39%16%
2160
21st to endNight
18%48%29%29%12%
2376
November1st to 10thNight
12%311%26%33%14%
2391
11th to 20thNight
13%49%33%30%12%
2470
21st to endNight
17%410%22%33%14%
2512
December1st to 10thNight
16%5%16%29%25%9%
2660
11th to 20thNight
17%5%15%25%30%8%
3272
21st to endNight
19%9%12%25%23%12%
4873

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%17%34%20%10%4
270
11th to 20thDay
11%18%38%27%6%1
240
21st to endDay
5%17%44%26%8%1
264
February1st to 10thDay
9%24%46%17%31
240
11th to 20thDay
12%29%39%16%41
240
21st to endDay
16%21%39%18%6%
198
March1st to 10thDay
12%21%40%20%5%1
249
11th to 20thDay
12%22%35%22%8%1
420
21st to endDay
15%26%39%16%3
462
April1st to 10thDay
15%25%34%20%6%1
420
11th to 20thDay
18%27%34%15%5%1
412
21st to endDay
16%24%37%15%7%1
420
May1st to 10thDay
12%19%37%21%9%2
457
11th to 20thDay
12%10%27%31%16%3
625
21st to endDay
8%13%30%28%16%5%
679
June1st to 10thDay
6%9%27%29%22%7%
630
11th to 20thDay
5%10%32%31%17%6%
630
21st to endDay
5%7%28%29%24%7%
630
July1st to 10thDay
8%216%36%28%10%
621
11th to 20thDay
4213%35%35%11%
618
21st to endDay
8%210%32%34%14%
525
August1st to 10thDay
7%316%36%26%12%
447
11th to 20thDay
5%222%36%25%9%
437
21st to endDay
9%319%36%25%8%
495
September1st to 10thDay
7%5%22%32%24%10%
450
11th to 20thDay
6%8%30%33%19%4
442
21st to endDay
7%7%23%28%28%8%
270
October1st to 10thDay
10%11%27%21%23%9%
270
11th to 20thDay
8%15%30%27%14%6%
270
21st to endDay
12%13%31%25%15%3
297
November1st to 10thDay
8%20%32%25%13%3
270
11th to 20thDay
5%19%41%22%9%4
270
21st to endDay
7%15%38%30%8%2
270
December1st to 10thDay
12%21%36%22%8%1
270
11th to 20thDay
9%22%39%18%10%2
270
21st to endDay
12%24%42%18%41
297
January1st to 10thNight
5%17%36%29%10%2
950
11th to 20thNight
418%39%28%9%2
783
21st to endNight
312%45%32%7%1
792
February1st to 10thNight
412%53%26%6%
720
11th to 20thNight
5%14%50%23%7%
704
21st to endNight
413%53%28%3
592
March1st to 10thNight
5%18%42%28%6%1
720
11th to 20thNight
6%8%39%34%12%1
720
21st to endNight
7%13%45%31%5%
678
April1st to 10thNight
7%13%44%30%6%
540
11th to 20thNight
10%14%37%31%7%1
533
21st to endNight
9%12%35%33%11%1
540
May1st to 10thNight
7%10%31%40%10%1
540
11th to 20thNight
12%6%25%36%18%2
531
21st to endNight
10%10%27%34%16%3
584
June1st to 10thNight
6%7%21%40%25%2
540
11th to 20thNight
37%26%45%17%2
540
21st to endNight
3418%39%32%3
540
July1st to 10thNight
8%28%37%40%6%
525
11th to 20thNight
6%15%37%42%10%
522
21st to endNight
5%2330%53%7%
591
August1st to 10thNight
7%26%35%40%10%
537
11th to 20thNight
7%110%41%35%6%
534
21st to endNight
5%211%40%36%6%
594
September1st to 10thNight
5%314%41%29%8%
540
11th to 20thNight
7%421%39%24%5%
540
21st to endNight
5%6%26%37%22%4
540
October1st to 10thNight
7%7%28%39%17%3
717
11th to 20thNight
37%34%38%16%3
720
21st to endNight
6%7%36%33%16%3
792
November1st to 10thNight
311%36%35%14%2
911
11th to 20thNight
412%40%30%11%2
950
21st to endNight
6%10%37%35%11%1
950
December1st to 10thNight
415%41%32%7%1
950
11th to 20thNight
5%15%45%26%8%1
950
21st to endNight
6%19%44%24%5%1
1045
Page generated at 2024-01-08 09:14:15. Version ac07

Copyright 2024 Attilla Danko


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