Ciudad Delicias
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ciudad Delicias clear sky chart from 2005-11-05 to 2017-09-23.

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
73%
14963
30%
46964
23%
14922
80%
14922
37%
25774

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
77%
717
36%
2148
30%
716
84%
716
48%
1083
January16th to endNight
72%
768
32%
2304
27%
768
79%
768
42%
1228
February1st to 15thNight
68%
700
37%
2103
26%
696
80%
696
54%
1002
February16th to endNight
66%
632
37%
1894
27%
632
76%
632
53%
907
March1st to 15thNight
61%
720
40%
2007
22%
720
73%
720
51%
1031
March16th to endNight
61%
714
36%
2058
19%
714
74%
714
46%
1062
April1st to 15thNight
49%
539
38%
1798
20%
539
72%
539
46%
838
April16th to endNight
50%
540
36%
1800
24%
540
70%
540
47%
833
May1st to 15thNight
48%
539
30%
1799
20%
539
65%
539
43%
867
May16th to endNight
59%
561
29%
1870
24%
561
71%
561
37%
970
June1st to 15thNight
75%
540
21%
1800
22%
540
79%
540
31%
1018
June16th to endNight
81%
540
15%
1800
16%
540
84%
540
24%
1144
July1st to 15thNight
85%
510
12%
1700
15%
510
86%
510
19%
1158
July16th to endNight
84%
564
9%
1771
11%
531
85%
531
13%
1320
August1st to 15thNight
88%
539
14%
1789
16%
536
88%
536
17%
1240
August16th to endNight
88%
573
11%
1910
13%
573
88%
573
17%
1343
September1st to 15thNight
82%
540
12%
1800
13%
540
83%
540
17%
1286
September16th to endNight
78%
516
20%
1858
22%
516
78%
516
19%
1217
October1st to 15thNight
82%
599
28%
1919
24%
599
84%
599
37%
1063
October16th to endNight
85%
704
37%
2112
28%
704
89%
704
55%
1003
November1st to 15thNight
81%
700
40%
2100
30%
700
86%
700
61%
946
November16th to endNight
78%
720
42%
2160
31%
720
86%
720
55%
1017
December1st to 15thNight
80%
720
42%
2160
35%
720
84%
720
52%
1051
December16th to endNight
73%
768
40%
2304
30%
768
82%
768
48%
1147

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
100%
47907
Night
100%
47194
TransparencyDay
21%47%18%25%23%
47629
Night
29%47%14%22%22%
46976
SeeingDay
5%415%27%29%17%
4972
Night
6%216%42%27%3
14973

By Month

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
100%
1790
16th to endDay
100%
1920
February1st to 15thDay
100%
1750
16th to endDay
100%
1580
March1st to 15thDay
100%
1950
16th to endDay
100%
2161
April1st to 15thDay
100%
2150
16th to endDay
100%
2160
May1st to 15thDay
100%
2151
16th to endDay
100%
2243
June1st to 15thDay
100%
2160
16th to endDay
100%
2160
July1st to 15thDay
100%
2160
16th to endDay
100%
2277
August1st to 15thDay
100%
2160
16th to endDay
100%
2292
September1st to 15thDay
100%
2160
16th to endDay
100%
1936
October1st to 15thDay
100%
1708
16th to endDay
100%
1760
November1st to 15thDay
100%
1759
16th to endDay
100%
1800
December1st to 15thDay
100%
1800
16th to endDay
100%
1920
January1st to 15thNight
100%
2148
16th to endNight
100%
2304
February1st to 15thNight
100%
2102
16th to endNight
100%
1894
March1st to 15thNight
100%
2007
16th to endNight
100%
2058
April1st to 15thNight
100%
1798
16th to endNight
100%
1800
May1st to 15thNight
100%
1799
16th to endNight
100%
1870
June1st to 15thNight
100%
1800
16th to endNight
100%
1800
July1st to 15thNight
100%
1800
16th to endNight
100%
1891
August1st to 15thNight
100%
1800
16th to endNight
100%
1910
September1st to 15thNight
100%
1800
16th to endNight
100%
1858
October1st to 15thNight
100%
1919
16th to endNight
100%
2112
November1st to 15thNight
100%
2100
16th to endNight
100%
2160
December1st to 15thNight
100%
2160
16th to endNight
100%
2304

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
24%36%23%26%16%
1791
16th to endDay
23%2419%33%16%
1920
February1st to 15thDay
19%338%31%33%
1751
16th to endDay
14%2213%37%29%
1580
March1st to 15thDay
19%1310%28%36%
1950
16th to endDay
16%2210%25%43%
2163
April1st to 15thDay
15%2210%24%45%
2150
16th to endDay
14%128%20%51%
2160
May1st to 15thDay
16%2311%22%43%
2151
16th to endDay
15%2411%22%43%
2246
June1st to 15thDay
11%2318%32%32%
2160
16th to endDay
19%410%23%25%17%
2160
July1st to 15thDay
30%8%14%25%15%5%
2031
16th to endDay
33%9%19%25%10%
2134
August1st to 15thDay
23%10%21%28%14%1
2147
16th to endDay
33%9%18%24%11%3
2292
September1st to 15thDay
34%7%16%22%14%4
2160
16th to endDay
31%5%12%22%20%8%
1936
October1st to 15thDay
16%39%22%31%16%
1708
16th to endDay
13%2318%36%25%
1760
November1st to 15thDay
17%1419%34%22%
1759
16th to endDay
19%25%17%26%28%
1800
December1st to 15thDay
21%25%19%36%13%
1800
16th to endDay
20%2422%35%14%
1920
January1st to 15thNight
23%26%18%31%17%
2148
16th to endNight
27%26%13%28%21%
2304
February1st to 15thNight
18%2210%28%37%
2112
16th to endNight
19%2212%31%32%
1894
March1st to 15thNight
21%2211%27%34%
2007
16th to endNight
23%239%23%37%
2058
April1st to 15thNight
20%248%23%40%
1798
16th to endNight
20%249%21%42%
1800
May1st to 15thNight
22%3312%21%35%
1800
16th to endNight
27%35%9%19%33%
1872
June1st to 15thNight
32%5%9%17%17%17%
1800
16th to endNight
41%6%11%17%12%10%
1800
July1st to 15thNight
46%8%15%15%9%4
1700
16th to endNight
54%10%14%14%5%
1771
August1st to 15thNight
46%10%17%14%9%1
1789
16th to endNight
48%9%15%15%8%2
1910
September1st to 15thNight
50%8%14%14%8%4
1800
16th to endNight
46%5%10%14%12%8%
1858
October1st to 15thNight
29%5%8%16%21%19%
1919
16th to endNight
18%2318%24%31%
2112
November1st to 15thNight
15%15%18%33%26%
2100
16th to endNight
18%26%15%24%33%
2160
December1st to 15thNight
20%16%16%35%18%
2160
16th to endNight
22%2317%35%18%
2304

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
6%6%20%33%27%5%
90
16th to endDay
2423%42%21%5%
96
February1st to 15thDay
1114%23%38%21%
90
16th to endDay
4314%32%33%11%
81
March1st to 15thDay
211%28%30%21%4
240
16th to endDay
414%27%31%18%3
288
April1st to 15thDay
316%33%28%15%2
269
16th to endDay
412%36%25%15%5%
270
May1st to 15thDay
410%33%31%16%2
288
16th to endDay
35%25%39%21%5%
330
June1st to 15thDay
28%30%37%20%
315
16th to endDay
45%31%35%23%
315
July1st to 15thDay
7%2326%35%25%
305
16th to endDay
3325%36%30%
327
August1st to 15thDay
41118%40%32%
315
16th to endDay
8%121%37%31%
332
September1st to 15thDay
5%1422%35%30%
315
16th to endDay
16%15%12%36%27%
154
October1st to 15thDay
10%1312%31%42%
90
16th to endDay
1212%16%39%28%
96
November1st to 15thDay
7%8%36%32%14%
90
16th to endDay
11%215%30%33%7%
90
December1st to 15thDay
6%116%22%31%22%
90
16th to endDay
7%5%25%37%21%3
96
January1st to 15thNight
6%114%54%21%1
720
16th to endNight
6%316%53%18%
768
February1st to 15thNight
6%122%48%19%
704
16th to endNight
35%24%53%13%
632
March1st to 15thNight
7%426%46%13%
720
16th to endNight
7%6%23%47%13%
714
April1st to 15thNight
5%7%37%40%8%
539
16th to endNight
5%5%37%42%8%
540
May1st to 15thNight
5%6%39%40%7%
540
16th to endNight
5%430%44%15%
563
June1st to 15thNight
5%216%44%30%1
540
16th to endNight
5%210%42%34%4
540
July1st to 15thNight
7%6%35%45%5%
510
16th to endNight
7%25%31%45%8%
564
August1st to 15thNight
7%2123%49%15%
539
16th to endNight
6%1324%53%10%
573
September1st to 15thNight
13%1225%50%6%
540
16th to endNight
15%1429%42%5%
516
October1st to 15thNight
6%19%41%37%3
599
16th to endNight
418%42%38%3
704
November1st to 15thNight
7%11%44%34%2
700
16th to endNight
4114%45%30%2
720
December1st to 15thNight
5%112%48%30%2
720
16th to endNight
6%118%50%20%2
768
Page generated at 2017-09-24 07:15:47. Version ac04

Copyright 2017 A. Danko


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