Puerto Peņasco
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Puerto Peņasco clear sky chart from 2005-11-05 to 2017-09-24.

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
82%
15947
41%
47025
36%
15906
86%
15906
65%
20459

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
74%
718
38%
2327
35%
716
83%
716
58%
990
January16th to endNight
70%
768
40%
2430
37%
768
79%
768
52%
1126
February1st to 15thNight
78%
700
41%
2103
41%
697
84%
697
60%
937
February16th to endNight
73%
632
40%
1895
39%
632
80%
632
58%
866
March1st to 15thNight
74%
720
41%
2022
37%
720
81%
720
66%
918
March16th to endNight
83%
768
44%
2112
39%
768
87%
768
71%
929
April1st to 15thNight
79%
719
39%
1978
29%
719
84%
719
70%
882
April16th to endNight
83%
627
49%
1713
37%
627
88%
627
82%
704
May1st to 15thNight
83%
539
44%
1619
35%
539
89%
539
80%
609
May16th to endNight
91%
561
46%
1684
38%
561
93%
561
85%
620
June1st to 15thNight
92%
540
38%
1620
31%
540
92%
540
79%
625
June16th to endNight
95%
540
38%
1620
33%
540
95%
540
77%
638
July1st to 15thNight
91%
510
31%
1530
25%
510
92%
510
63%
675
July16th to endNight
89%
564
33%
1593
27%
531
89%
531
50%
797
August1st to 15thNight
91%
593
35%
1665
29%
590
91%
590
61%
791
August16th to endNight
90%
764
39%
1946
31%
764
90%
764
65%
963
September1st to 15thNight
89%
720
37%
1980
34%
720
89%
720
66%
917
September16th to endNight
89%
692
48%
1914
42%
692
92%
692
76%
813
October1st to 15thNight
82%
660
47%
1817
40%
660
87%
660
75%
781
October16th to endNight
85%
704
45%
2112
41%
704
90%
704
73%
854
November1st to 15thNight
82%
700
44%
2169
42%
700
88%
700
72%
859
November16th to endNight
74%
720
41%
2340
39%
720
81%
720
57%
1007
December1st to 15thNight
72%
720
41%
2340
39%
720
80%
720
58%
1009
December16th to endNight
68%
768
39%
2496
37%
768
75%
768
50%
1149

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
211212235%75%
47893
Night
212112235%75%
47230
TransparencyDay
12%2313%27%40%
47588
Night
12%2213%26%43%
47036
SeeingDay
26%24%43%22%
5694
Night
219%27%40%18%
15956

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
2112222236%71%
1611
16th to endDay
421222323469%
1791
February1st to 15thDay
1111212336%71%
1751
16th to endDay
221221335%8%65%
1579
March1st to 15thDay
11111235%5%73%
1938
16th to endDay
1111212235%77%
2112
April1st to 15thDay
11212235%77%
1970
16th to endDay
111111386%
2244
May1st to 15thDay
112484%
2331
16th to endDay
11290%
2429
June1st to 15thDay
11112385%
2340
16th to endDay
1121385%
2340
July1st to 15thDay
311222335%7%64%
2340
16th to endDay
321432346%10%56%
2467
August1st to 15thDay
2212222347%67%
2283
16th to endDay
212312336%70%
2256
September1st to 15thDay
3212221346%69%
1980
16th to endDay
21111386%
1904
October1st to 15thDay
11111111385%
1812
16th to endDay
11213481%
1760
November1st to 15thDay
111111125%81%
1687
16th to endDay
311111122476%
1620
December1st to 15thDay
3113323246%67%
1620
16th to endDay
2212212247%70%
1728
January1st to 15thNight
112212347%70%
2327
16th to endNight
423323346%66%
2430
February1st to 15thNight
212212346%71%
2101
16th to endNight
3112222346%68%
1895
March1st to 15thNight
3112111245%73%
2022
16th to endNight
21112336%77%
2112
April1st to 15thNight
11111222479%
1978
16th to endNight
1111288%
1713
May1st to 15thNight
1112386%
1619
16th to endNight
11290%
1684
June1st to 15thNight
1111112385%
1620
16th to endNight
1112385%
1620
July1st to 15thNight
11231345%9%67%
1620
16th to endNight
111332447%13%56%
1701
August1st to 15thNight
11222346%7%67%
1674
16th to endNight
211212347%71%
1946
September1st to 15thNight
31212227%73%
1980
16th to endNight
21122483%
1914
October1st to 15thNight
111112383%
1817
16th to endNight
111223480%
2112
November1st to 15thNight
1111123380%
2169
16th to endNight
2212112245%73%
2340
December1st to 15thNight
3212212247%69%
2340
16th to endNight
3213212336%68%
2496

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
16%1413%27%36%
1612
16th to endDay
19%1217%27%31%
1791
February1st to 15thDay
14%1215%27%37%
1751
16th to endDay
18%2216%32%26%
1579
March1st to 15thDay
11%2110%28%46%
1938
16th to endDay
12%139%28%45%
2112
April1st to 15thDay
11%111%33%41%
1970
16th to endDay
6%19%24%56%
2244
May1st to 15thDay
6%16%28%56%
2331
16th to endDay
37%31%57%
2432
June1st to 15thDay
7%421%66%
2340
16th to endDay
7%12318%65%
2340
July1st to 15thDay
16%5%7%17%24%28%
2201
16th to endDay
20%415%29%23%6%
2312
August1st to 15thDay
16%37%24%26%21%
2268
16th to endDay
15%37%24%24%24%
2256
September1st to 15thDay
15%37%19%28%25%
1980
16th to endDay
7%11%33%45%
1904
October1st to 15thDay
7%1210%33%44%
1812
16th to endDay
8%1213%24%48%
1760
November1st to 15thDay
9%110%34%43%
1687
16th to endDay
14%1111%28%42%
1620
December1st to 15thDay
19%2215%28%31%
1620
16th to endDay
16%25%19%30%25%
1728
January1st to 15thNight
15%2313%25%40%
2327
16th to endNight
18%2312%27%35%
2430
February1st to 15thNight
14%2214%23%42%
2112
16th to endNight
17%1215%28%35%
1895
March1st to 15thNight
13%118%25%49%
2022
16th to endNight
10%1111%28%46%
2112
April1st to 15thNight
11%118%33%44%
1978
16th to endNight
6%7%26%58%
1713
May1st to 15thNight
5%15%25%61%
1620
16th to endNight
316%22%66%
1685
June1st to 15thNight
6%317%70%
1620
16th to endNight
7%11213%73%
1620
July1st to 15thNight
12%36%18%23%34%
1530
16th to endNight
19%5%9%30%25%9%
1593
August1st to 15thNight
13%46%21%28%24%
1665
16th to endNight
13%37%23%27%24%
1946
September1st to 15thNight
13%25%18%31%27%
1980
16th to endNight
7%210%34%44%
1914
October1st to 15thNight
8%1210%30%46%
1817
16th to endNight
8%1310%20%56%
2112
November1st to 15thNight
9%1110%29%47%
2169
16th to endNight
15%2111%21%47%
2340
December1st to 15thNight
15%2317%24%37%
2340
16th to endNight
19%2416%29%27%
2496

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
5%210%47%30%4
90
16th to endDay
1118%30%33%14%
159
February1st to 15thDay
26%32%48%10%
266
16th to endDay
2110%43%33%9%
238
March1st to 15thDay
1212%31%33%18%
270
16th to endDay
110%36%29%21%
288
April1st to 15thDay
1110%35%38%13%
269
16th to endDay
111%30%44%11%
270
May1st to 15thDay
1113%31%36%15%
288
16th to endDay
6%26%50%14%
330
June1st to 15thDay
2318%57%17%
315
16th to endDay
113%49%34%
315
July1st to 15thDay
1113%51%31%
305
16th to endDay
318%43%42%
327
August1st to 15thDay
110%45%41%
315
16th to endDay
18%51%38%
332
September1st to 15thDay
6%217%44%28%
315
16th to endDay
3422%46%23%
288
October1st to 15thDay
17%30%41%19%
252
16th to endDay
11219%41%34%
96
November1st to 15thDay
28%30%36%22%
90
16th to endDay
6%418%36%26%6%
90
December1st to 15thDay
211%23%47%15%
90
16th to endDay
6%6%14%40%28%4
96
January1st to 15thNight
2314%41%32%5%
720
16th to endNight
6%214%38%32%7%
768
February1st to 15thNight
228%36%41%7%
704
16th to endNight
4215%39%30%8%
632
March1st to 15thNight
3115%34%33%10%
720
16th to endNight
228%32%39%15%
768
April1st to 15thNight
1213%36%37%8%
719
16th to endNight
211%29%43%12%
627
May1st to 15thNight
112%32%38%14%
540
16th to endNight
11423%48%19%
563
June1st to 15thNight
1320%57%16%
540
16th to endNight
13%51%33%
540
July1st to 15thNight
119%47%40%
510
16th to endNight
18%42%46%
564
August1st to 15thNight
27%45%43%
593
16th to endNight
38%46%41%
764
September1st to 15thNight
4116%43%33%
720
16th to endNight
2421%45%25%
692
October1st to 15thNight
1111%26%42%16%
660
16th to endNight
118%22%45%20%
704
November1st to 15thNight
2112%32%40%12%
700
16th to endNight
3115%31%34%12%
720
December1st to 15thNight
4117%37%31%8%
720
16th to endNight
4416%44%25%4
768
Page generated at 2017-09-25 07:02:17. Version ac04

Copyright 2017 A. Danko


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