Arizona Sky Village
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Arizona Sky Village clear sky chart from 2005-11-06 to 2024-01-10.

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
60%
23653
33%
74206
23%
23599
71%
23599
45%
36045

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
56%
760
33%
2456
25%
756
69%
756
43%
1189
January11th to 20thNight
60%
720
36%
2340
30%
720
72%
720
52%
1057
January21st to endNight
50%
792
36%
2574
25%
792
67%
792
40%
1246
February1st to 10thNight
56%
720
37%
2340
27%
720
73%
720
50%
1025
February11th to 20thNight
45%
700
34%
2115
19%
700
63%
700
44%
1018
February21st to endNight
43%
592
42%
1628
23%
592
62%
592
52%
778
March1st to 10thNight
44%
720
39%
1980
20%
720
62%
720
48%
981
March11th to 20thNight
51%
720
39%
1980
19%
720
68%
720
53%
945
March21st to endNight
48%
792
39%
2178
16%
792
66%
792
52%
1032
April1st to 10thNight
46%
657
40%
1917
18%
657
68%
657
58%
832
April11th to 20thNight
43%
533
40%
1777
20%
533
69%
533
52%
717
April21st to endNight
46%
540
44%
1800
23%
540
75%
540
56%
696
May1st to 10thNight
48%
540
37%
1797
22%
540
68%
540
55%
718
May11th to 20thNight
53%
531
37%
1594
22%
531
68%
531
56%
711
May21st to endNight
54%
582
42%
1746
24%
582
72%
582
66%
707
June1st to 10thNight
64%
540
34%
1620
26%
540
71%
540
59%
723
June11th to 20thNight
68%
540
34%
1620
25%
540
75%
540
62%
696
June21st to endNight
69%
540
23%
1620
20%
540
72%
540
41%
867
July1st to 10thNight
74%
525
19%
1575
16%
525
76%
525
32%
933
July11th to 20thNight
72%
522
12%
1566
10%
522
72%
522
21%
1079
July21st to endNight
70%
591
10%
1674
9%
558
70%
558
19%
1194
August1st to 10thNight
75%
537
13%
1602
13%
534
75%
534
26%
1037
August11th to 20thNight
76%
534
22%
1731
22%
534
77%
534
26%
1076
August21st to endNight
72%
594
19%
1980
20%
594
73%
594
25%
1234
September1st to 10thNight
69%
550
23%
1810
24%
550
70%
550
27%
1105
September11th to 20thNight
79%
720
33%
1980
27%
720
81%
720
46%
1094
September21st to endNight
73%
720
34%
1980
21%
720
80%
720
53%
1020
October1st to 10thNight
68%
720
33%
2155
24%
720
75%
720
51%
1048
October11th to 20thNight
68%
720
39%
2160
25%
720
79%
720
58%
967
October21st to endNight
69%
792
44%
2376
31%
792
79%
792
67%
971
November1st to 10thNight
67%
740
44%
2220
32%
740
77%
740
64%
926
November11th to 20thNight
66%
760
41%
2280
28%
760
77%
760
57%
1022
November21st to endNight
54%
760
40%
2317
27%
760
67%
760
43%
1131
December1st to 10thNight
59%
760
38%
2470
28%
760
71%
760
44%
1185
December11th to 20thNight
53%
759
33%
2932
25%
758
68%
758
35%
1438
December21st to endNight
52%
830
24%
4316
27%
817
65%
817
32%
1647

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
32134345%5%7%63%
74989
Night
221332445%7%65%
74727
TransparencyDay
20%5%7%14%27%26%
74715
Night
19%6%7%15%27%26%
74522
SeeingDay
7%14%26%30%18%4
13532
Night
49%22%36%25%5%
23666

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
23233345%5%7%63%
1699
11th to 20thDay
222332335%8%67%
1620
21st to endDay
4323323447%64%
1782
February1st to 10thDay
1113234447%70%
1620
11th to 20thDay
342322445%6%66%
1727
21st to endDay
221221335%7%73%
1628
March1st to 10thDay
11134345%6%7%65%
1980
11th to 20thDay
221221445%6%71%
1980
21st to endDay
111222345%6%73%
2178
April1st to 10thDay
11221336%7%74%
2042
11th to 20thDay
22112233480%
2131
21st to endDay
1111212235%81%
2160
May1st to 10thDay
1112322335%76%
2160
11th to 20thDay
1211323347%74%
2300
21st to endDay
1111223335%80%
2530
June1st to 10thDay
111222345%7%70%
2340
11th to 20thDay
1112313446%74%
2340
21st to endDay
34245%45%5%7%7%54%
2340
July1st to 10thDay
5%225%5%47%7%10%10%43%
2340
11th to 20thDay
4325%7%6%9%9%10%11%35%
2340
21st to endDay
7%5%36%7%5%8%9%9%12%29%
2545
August1st to 10thDay
5%326%7%48%8%10%11%35%
2328
11th to 20thDay
5%426%7%5%8%7%8%11%36%
2170
21st to endDay
5%4346%47%8%9%10%40%
2376
September1st to 10thDay
6%426%6%36%6%8%7%46%
2143
11th to 20thDay
43145%35%6%6%8%56%
1980
21st to endDay
4214433447%64%
1980
October1st to 10thDay
3213223448%68%
1805
11th to 20thDay
321332334473%
1800
21st to endDay
112212335%78%
1980
November1st to 10thDay
1112223247%76%
1859
11th to 20thDay
1212323446%72%
1900
21st to endDay
4313423446%66%
1861
December1st to 10thDay
32123245%47%65%
1710
11th to 20thDay
23245%34447%60%
2169
21st to endDay
121232345%6%70%
3146
January1st to 10thNight
321232446%6%65%
2456
11th to 20thNight
2212223346%72%
2340
21st to endNight
331343445%5%65%
2574
February1st to 10thNight
111222445%7%73%
2340
11th to 20thNight
3212324346%69%
2115
21st to endNight
111221435%7%72%
1628
March1st to 10thNight
221232336%10%67%
1980
11th to 20thNight
2212223346%73%
1980
21st to endNight
1212213447%73%
2178
April1st to 10thNight
1111213346%75%
1917
11th to 20thNight
1212213445%76%
1777
21st to endNight
112122236%81%
1800
May1st to 10thNight
1111223345%77%
1797
11th to 20thNight
2113212346%75%
1594
21st to endNight
112212235%82%
1746
June1st to 10thNight
3222212436%73%
1620
11th to 20thNight
2113213345%76%
1620
21st to endNight
42245%35%6%8%8%55%
1620
July1st to 10thNight
4315%5%48%8%8%10%44%
1620
11th to 20thNight
35%38%7%5%8%9%12%12%28%
1620
21st to endNight
5%5%37%7%7%8%9%11%13%25%
1773
August1st to 10thNight
3326%7%48%8%10%12%36%
1611
11th to 20thNight
4425%5%46%8%8%13%40%
1731
21st to endNight
5%5%25%6%5%7%7%10%10%39%
1980
September1st to 10thNight
6%5%246%46%6%8%9%44%
1810
11th to 20thNight
5%21343445%8%61%
1980
21st to endNight
2313323446%69%
1980
October1st to 10thNight
3112324445%70%
2155
11th to 20thNight
221222235%5%76%
2160
21st to endNight
11121224482%
2376
November1st to 10thNight
111212346%78%
2220
11th to 20thNight
2212223345%75%
2280
21st to endNight
3313323346%69%
2317
December1st to 10thNight
321331446%7%67%
2470
11th to 20thNight
1213445%5%6%7%63%
3041
21st to endNight
221232446%6%68%
4521

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
22%5%6%16%36%15%
1700
11th to 20thDay
16%6%6%14%35%22%
1620
21st to endDay
22%45%15%32%22%
1782
February1st to 10thDay
17%4414%28%33%
1620
11th to 20thDay
20%47%14%28%27%
1736
21st to endDay
16%3412%27%38%
1628
March1st to 10thDay
20%45%12%31%29%
1980
11th to 20thDay
16%35%11%32%33%
1980
21st to endDay
13%37%11%35%30%
2178
April1st to 10thDay
11%2410%39%34%
2042
11th to 20thDay
9%238%30%48%
2134
21st to endDay
9%2310%31%44%
2160
May1st to 10thDay
12%248%23%50%
2160
11th to 20thDay
13%35%10%29%39%
2303
21st to endDay
9%246%27%51%
2530
June1st to 10thDay
13%447%29%43%
2340
11th to 20thDay
12%35%6%21%54%
2340
21st to endDay
24%6%8%12%20%30%
2340
July1st to 10thDay
29%10%12%17%17%14%
2276
11th to 20thDay
32%14%19%21%11%4
2271
21st to endDay
39%15%19%17%10%1
2404
August1st to 10thDay
33%13%16%20%13%4
2313
11th to 20thDay
36%12%15%17%14%6%
2170
21st to endDay
33%11%12%20%15%8%
2376
September1st to 10thDay
33%9%11%14%18%14%
2143
11th to 20thDay
24%6%8%18%25%19%
1980
21st to endDay
18%5%7%18%32%20%
1980
October1st to 10thDay
15%5%8%17%27%27%
1805
11th to 20thDay
17%3414%27%35%
1800
21st to endDay
10%2417%34%32%
1980
November1st to 10thDay
11%35%18%37%27%
1859
11th to 20thDay
13%45%18%33%26%
1900
21st to endDay
21%4418%29%23%
1861
December1st to 10thDay
19%47%22%28%19%
1710
11th to 20thDay
26%5%6%19%29%15%
2168
21st to endDay
16%48%16%41%15%
3146
January1st to 10thNight
20%6%8%17%32%18%
2456
11th to 20thNight
16%45%16%36%23%
2340
21st to endNight
22%45%17%31%21%
2574
February1st to 10thNight
15%36%15%27%33%
2340
11th to 20thNight
18%4416%28%28%
2116
21st to endNight
14%46%11%28%37%
1628
March1st to 10thNight
17%36%14%31%29%
1980
11th to 20thNight
14%45%12%32%33%
1980
21st to endNight
14%36%11%38%28%
2178
April1st to 10thNight
11%25%13%36%33%
1917
11th to 20thNight
12%2411%30%41%
1777
21st to endNight
10%2410%34%40%
1800
May1st to 10thNight
11%338%27%47%
1797
11th to 20thNight
13%45%12%26%39%
1595
21st to endNight
9%238%29%49%
1746
June1st to 10thNight
14%348%29%42%
1620
11th to 20thNight
12%35%6%21%54%
1620
21st to endNight
24%8%9%12%18%30%
1620
July1st to 10thNight
29%10%14%19%14%13%
1575
11th to 20thNight
38%16%18%18%7%3
1566
21st to endNight
41%17%22%13%7%1
1674
August1st to 10thNight
33%14%18%20%11%3
1602
11th to 20thNight
34%11%17%17%16%5%
1731
21st to endNight
34%12%17%18%12%7%
1980
September1st to 10thNight
32%12%13%13%17%12%
1810
11th to 20thNight
23%7%9%18%25%19%
1980
21st to endNight
18%5%7%17%35%18%
1980
October1st to 10thNight
17%5%9%15%26%27%
2155
11th to 20thNight
13%45%16%25%38%
2160
21st to endNight
9%3415%35%35%
2376
November1st to 10thNight
9%45%18%37%27%
2220
11th to 20thNight
14%35%18%33%27%
2280
21st to endNight
19%5%6%17%29%24%
2317
December1st to 10thNight
20%5%6%21%28%20%
2470
11th to 20thNight
21%7%8%19%30%15%
3041
21st to endNight
19%46%16%35%21%
4521

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
12%21%26%33%8%1
267
11th to 20thDay
8%13%34%33%10%2
240
21st to endDay
9%20%31%27%11%2
264
February1st to 10thDay
322%26%31%15%3
240
11th to 20thDay
16%28%29%23%3
320
21st to endDay
17%33%32%12%5%1
346
March1st to 10thDay
11%31%34%18%6%1
420
11th to 20thDay
14%24%30%21%8%3
420
21st to endDay
13%31%30%19%6%1
462
April1st to 10thDay
5%23%40%22%7%2
420
11th to 20thDay
5%32%35%20%6%2
412
21st to endDay
9%24%36%23%6%3
420
May1st to 10thDay
7%22%37%22%11%1
423
11th to 20thDay
416%38%30%10%2
448
21st to endDay
415%41%29%10%1
485
June1st to 10thDay
48%35%34%17%2
450
11th to 20thDay
29%31%34%21%3
450
21st to endDay
5%322%46%20%4
450
July1st to 10thDay
6%111%45%31%6%
446
11th to 20thDay
417%39%39%10%
444
21st to endDay
4210%34%36%14%
487
August1st to 10thDay
5%2431%43%15%
447
11th to 20thDay
338%39%39%8%
437
21st to endDay
429%31%41%14%
495
September1st to 10thDay
6%5%19%37%27%6%
450
11th to 20thDay
3218%43%28%6%
450
21st to endDay
47%26%35%20%8%
450
October1st to 10thDay
410%25%31%23%7%
275
11th to 20thDay
9%12%24%30%19%6%
270
21st to endDay
6%10%28%28%23%5%
297
November1st to 10thDay
6%14%37%28%13%3
270
11th to 20thDay
313%30%32%20%1
270
21st to endDay
10%22%30%28%10%1
270
December1st to 10thDay
9%14%34%31%12%
270
11th to 20thDay
7%21%34%29%9%
270
21st to endDay
11%19%36%26%5%2
297
January1st to 10thNight
49%27%37%19%4
760
11th to 20thNight
5%8%24%38%21%4
720
21st to endNight
6%14%25%35%17%3
792
February1st to 10thNight
114%25%33%22%4
720
11th to 20thNight
6%16%31%32%13%2
704
21st to endNight
5%17%33%32%11%1
592
March1st to 10thNight
5%18%31%33%11%2
720
11th to 20thNight
5%14%27%31%19%4
720
21st to endNight
5%16%29%32%16%2
792
April1st to 10thNight
213%36%34%13%2
657
11th to 20thNight
418%33%30%14%1
533
21st to endNight
117%34%34%11%3
540
May1st to 10thNight
213%34%36%13%2
540
11th to 20thNight
27%34%37%18%1
531
21st to endNight
27%33%38%18%1
584
June1st to 10thNight
4325%46%22%2
540
11th to 20thNight
2422%49%22%1
540
21st to endNight
2318%40%34%2
540
July1st to 10thNight
4111%41%37%6%
525
11th to 20thNight
427%36%43%8%
522
21st to endNight
5%25%28%48%11%
591
August1st to 10thNight
41428%48%14%
537
11th to 20thNight
5%25%30%49%9%
534
21st to endNight
7%27%23%51%10%
594
September1st to 10thNight
8%211%31%41%7%
550
11th to 20thNight
6%17%35%42%8%
720
21st to endNight
2215%44%30%7%
720
October1st to 10thNight
26%18%42%27%4
720
11th to 20thNight
36%21%38%26%6%
720
21st to endNight
36%20%35%28%8%
792
November1st to 10thNight
37%21%38%23%8%
740
11th to 20thNight
37%22%39%26%4
760
21st to endNight
5%14%23%34%19%5%
760
December1st to 10thNight
49%26%36%21%4
760
11th to 20thNight
312%28%36%18%3
760
21st to endNight
6%13%26%35%15%5%
836
Page generated at 2024-01-07 08:06:57. Version ac07

Copyright 2024 Attilla Danko


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