Sedona
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sedona clear sky chart from 2005-11-06 to 2024-03-23.

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
58%
24273
34%
79765
24%
24166
69%
24166
44%
38617

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
46%
756
36%
4002
21%
736
65%
736
27%
1770
January11th to 20thNight
45%
758
38%
3932
24%
740
61%
740
30%
1551
January21st to endNight
40%
832
23%
4296
20%
814
62%
814
19%
2402
February1st to 10thNight
49%
760
33%
2441
23%
760
65%
760
39%
1187
February11th to 20thNight
41%
740
33%
2219
18%
740
61%
740
41%
1176
February21st to endNight
42%
628
32%
1876
24%
628
55%
628
37%
1019
March1st to 10thNight
41%
760
34%
2090
18%
760
58%
760
44%
1125
March11th to 20thNight
51%
760
34%
2090
22%
760
62%
760
43%
1137
March21st to endNight
52%
800
33%
2200
18%
800
65%
800
48%
1136
April1st to 10thNight
47%
720
31%
1980
15%
720
60%
720
51%
987
April11th to 20thNight
47%
583
37%
1823
20%
583
65%
583
47%
820
April21st to endNight
52%
540
44%
1620
23%
540
70%
540
58%
687
May1st to 10thNight
58%
540
39%
1620
25%
540
70%
540
57%
702
May11th to 20thNight
61%
531
39%
1594
28%
531
69%
531
58%
690
May21st to endNight
56%
582
37%
1746
24%
582
66%
582
61%
738
June1st to 10thNight
68%
540
36%
1620
28%
540
73%
540
66%
672
June11th to 20thNight
64%
540
37%
1620
29%
540
71%
540
72%
629
June21st to endNight
72%
540
33%
1620
28%
540
76%
540
63%
697
July1st to 10thNight
80%
525
26%
1575
23%
525
80%
525
48%
796
July11th to 20thNight
86%
522
24%
1566
20%
522
86%
522
45%
806
July21st to endNight
79%
591
21%
1674
19%
558
79%
558
35%
990
August1st to 10thNight
82%
537
25%
1602
21%
534
82%
534
45%
821
August11th to 20thNight
82%
534
29%
1602
26%
534
83%
534
44%
835
August21st to endNight
84%
652
32%
1943
29%
652
84%
652
46%
996
September1st to 10thNight
78%
720
30%
1980
24%
720
81%
720
47%
1083
September11th to 20thNight
76%
720
41%
1980
30%
720
83%
720
63%
950
September21st to endNight
70%
720
39%
1980
25%
720
78%
720
59%
941
October1st to 10thNight
60%
720
37%
2029
22%
720
71%
720
52%
1011
October11th to 20thNight
60%
720
41%
2160
28%
720
73%
720
62%
936
October21st to endNight
59%
792
44%
2376
28%
792
75%
792
60%
1035
November1st to 10thNight
57%
740
41%
2220
27%
740
72%
740
54%
1038
November11th to 20thNight
55%
760
39%
2470
27%
760
72%
760
57%
1047
November21st to endNight
50%
760
37%
2470
26%
760
66%
760
43%
1182
December1st to 10thNight
51%
760
35%
2470
27%
760
65%
760
40%
1231
December11th to 20thNight
46%
758
32%
2936
23%
758
61%
758
29%
1604
December21st to endNight
42%
832
21%
4343
20%
817
58%
817
21%
2190

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
5%42342445%6%61%
79209
Night
5%5%13323346%64%
80752
TransparencyDay
22%5%6%17%28%22%
78936
Night
21%46%17%28%24%
80547
SeeingDay
10%16%29%29%12%4
14039
Night
8%8%22%34%24%5%
24295

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
5%7%35%423345%60%
2858
11th to 20thDay
5%6%24412345%62%
2860
21st to endDay
13%10%23223347%51%
3146
February1st to 10thDay
6%9%24312337%61%
1736
11th to 20thDay
8%7%24423446%58%
1850
21st to endDay
8%10%23423346%54%
1576
March1st to 10thDay
8%6%2432345%7%57%
2090
11th to 20thDay
6%7%24413437%59%
2090
21st to endDay
6%5%2332345%7%61%
2201
April1st to 10thDay
421343335%8%63%
1980
11th to 20thDay
3413322345%70%
2079
21st to endDay
4213313346%70%
2340
May1st to 10thDay
4313323447%67%
2340
11th to 20thDay
3213224447%67%
2301
21st to endDay
4212222235%74%
2530
June1st to 10thDay
111221335%6%75%
2340
11th to 20thDay
211111222483%
2340
21st to endDay
2112324445%72%
2340
July1st to 10thDay
2223437%7%7%7%56%
2340
11th to 20thDay
5%3246%47%8%10%11%40%
2340
21st to endDay
7%5%25%6%5%8%9%9%9%34%
2545
August1st to 10thDay
4425%6%46%6%7%7%50%
2328
11th to 20thDay
4325%6%46%7%8%9%46%
2299
21st to endDay
5%3246%45%6%6%9%50%
2409
September1st to 10thDay
5%325%5%35%6%5%7%54%
1980
11th to 20thDay
4112323446%70%
1980
21st to endDay
4213323346%69%
1980
October1st to 10thDay
6%312323446%67%
1930
11th to 20thDay
221221223478%
1800
21st to endDay
3212312245%76%
1980
November1st to 10thDay
4312322337%71%
1856
11th to 20thDay
4212213345%73%
1710
21st to endDay
9%5%22212245%67%
1710
December1st to 10thDay
9%5%1332335%7%60%
1710
11th to 20thDay
9%7%26%5%3346%8%47%
2169
21st to endDay
11%9%25%32334453%
3146
January1st to 10thNight
5%7%2432335%6%59%
4097
11th to 20thNight
5%6%13322246%66%
4110
21st to endNight
12%12%23323345%49%
4521
February1st to 10thNight
6%6%23223245%65%
2441
11th to 20thNight
8%7%22314336%62%
2218
21st to endNight
8%10%2421335%6%57%
1876
March1st to 10thNight
6%6%2322335%7%60%
2090
11th to 20thNight
9%6%13323345%61%
2090
21st to endNight
6%5%12223446%66%
2200
April1st to 10thNight
5%212224447%66%
1980
11th to 20thNight
5%212223346%70%
1823
21st to endNight
3212312346%75%
1620
May1st to 10thNight
3111223346%74%
1620
11th to 20thNight
2212222335%76%
1594
21st to endNight
3112212235%77%
1746
June1st to 10thNight
1222112336%76%
1620
11th to 20thNight
11121112385%
1620
21st to endNight
2213212245%76%
1620
July1st to 10thNight
22135%245%7%7%60%
1620
11th to 20thNight
2212435%7%8%9%56%
1620
21st to endNight
43246%36%7%10%13%41%
1773
August1st to 10thNight
22145%35%6%7%9%58%
1611
11th to 20thNight
3213426%6%7%12%54%
1602
21st to endNight
22134348%6%9%57%
1943
September1st to 10thNight
43244245%6%8%58%
1980
11th to 20thNight
321222333475%
1980
21st to endNight
421222233475%
1980
October1st to 10thNight
5%313223346%67%
2029
11th to 20thNight
321221222380%
2160
21st to endNight
3212212245%76%
2376
November1st to 10thNight
431332233472%
2220
11th to 20thNight
3311213335%74%
2470
21st to endNight
8%413213336%66%
2470
December1st to 10thNight
8%5%12223347%61%
2470
11th to 20thNight
9%6%25%42435%7%52%
3041
21st to endNight
10%7%2443434454%
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
26%46%22%27%14%
2859
11th to 20thDay
24%47%30%21%13%
2860
21st to endDay
33%35%16%32%9%
3146
February1st to 10thDay
25%47%18%26%21%
1736
11th to 20thDay
27%45%19%25%20%
1860
21st to endDay
30%5%5%16%27%18%
1576
March1st to 10thDay
25%5%419%30%17%
2090
11th to 20thDay
24%5%5%20%31%15%
2090
21st to endDay
23%5%422%33%13%
2201
April1st to 10thDay
20%35%19%35%18%
1980
11th to 20thDay
16%4415%35%26%
2082
21st to endDay
16%4315%40%21%
2340
May1st to 10thDay
16%4417%34%24%
2340
11th to 20thDay
16%5%5%15%36%24%
2304
21st to endDay
13%3313%34%34%
2530
June1st to 10thDay
9%4310%34%40%
2340
11th to 20thDay
7%215%27%58%
2340
21st to endDay
13%35%7%25%47%
2340
July1st to 10thDay
20%7%8%14%19%31%
2276
11th to 20thDay
28%12%17%18%15%10%
2271
21st to endDay
35%13%17%16%13%5%
2404
August1st to 10thDay
27%9%11%16%17%20%
2313
11th to 20thDay
28%9%12%19%17%15%
2299
21st to endDay
26%9%10%17%27%11%
2409
September1st to 10thDay
27%7%8%14%21%22%
1980
11th to 20thDay
15%45%14%36%26%
1980
21st to endDay
15%45%14%32%30%
1980
October1st to 10thDay
19%45%18%24%30%
1930
11th to 20thDay
13%2310%34%39%
1800
21st to endDay
12%3416%37%28%
1980
November1st to 10thDay
15%3423%33%22%
1856
11th to 20thDay
14%4417%32%28%
1710
21st to endDay
22%2318%33%22%
1710
December1st to 10thDay
25%37%21%26%18%
1710
11th to 20thDay
35%5%7%20%21%12%
2168
21st to endDay
33%5%421%26%11%
3146
January1st to 10thNight
24%6%420%34%12%
4097
11th to 20thNight
21%47%30%26%12%
4110
21st to endNight
37%4415%28%12%
4521
February1st to 10thNight
23%37%17%28%23%
2441
11th to 20thNight
25%45%19%27%21%
2219
21st to endNight
27%5%5%15%30%19%
1876
March1st to 10thNight
22%5%5%17%34%17%
2090
11th to 20thNight
24%5%419%32%16%
2090
21st to endNight
20%47%22%32%16%
2200
April1st to 10thNight
18%45%18%36%20%
1980
11th to 20thNight
16%3313%35%29%
1823
21st to endNight
12%3416%40%26%
1620
May1st to 10thNight
12%36%18%33%27%
1620
11th to 20thNight
12%45%16%32%31%
1595
21st to endNight
11%2213%33%38%
1746
June1st to 10thNight
10%338%30%47%
1620
11th to 20thNight
7%215%24%61%
1620
21st to endNight
13%238%21%54%
1620
July1st to 10thNight
19%7%9%12%20%33%
1575
11th to 20thNight
18%10%16%23%20%12%
1566
21st to endNight
29%10%20%20%15%7%
1674
August1st to 10thNight
20%8%15%16%19%22%
1602
11th to 20thNight
20%8%15%21%17%19%
1602
21st to endNight
20%7%11%23%25%13%
1943
September1st to 10thNight
22%6%11%16%21%23%
1980
11th to 20thNight
14%45%15%31%31%
1980
21st to endNight
15%3411%32%35%
1980
October1st to 10thNight
18%45%19%22%32%
2029
11th to 20thNight
12%3311%31%40%
2160
21st to endNight
11%35%14%32%35%
2376
November1st to 10thNight
17%3320%34%24%
2220
11th to 20thNight
13%45%16%33%30%
2470
21st to endNight
21%3416%30%26%
2470
December1st to 10thNight
23%46%19%24%24%
2470
11th to 20thNight
31%5%7%18%25%15%
3041
21st to endNight
32%45%18%22%18%
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
18%14%33%24%10%1
270
11th to 20thDay
14%16%33%24%11%2
270
21st to endDay
14%18%34%22%10%2
297
February1st to 10thDay
16%15%34%23%9%2
296
11th to 20thDay
16%25%33%20%6%
455
21st to endDay
24%25%30%15%6%1
382
March1st to 10thDay
20%25%31%18%5%1
460
11th to 20thDay
19%21%28%21%9%2
460
21st to endDay
17%28%34%16%41
471
April1st to 10thDay
10%26%35%19%9%2
420
11th to 20thDay
16%29%33%13%7%2
412
21st to endDay
11%30%33%16%8%2
420
May1st to 10thDay
11%25%37%19%6%2
423
11th to 20thDay
7%20%37%22%10%4
448
21st to endDay
11%23%34%24%7%2
485
June1st to 10thDay
318%37%28%9%4
450
11th to 20thDay
6%17%38%25%9%5%
450
21st to endDay
410%33%35%13%4
450
July1st to 10thDay
26%30%42%13%7%
446
11th to 20thDay
5%316%43%23%11%
444
21st to endDay
7%310%41%27%11%
487
August1st to 10thDay
5%319%43%22%7%
447
11th to 20thDay
45%19%41%25%7%
437
21st to endDay
4317%41%24%11%
495
September1st to 10thDay
7%6%25%36%18%9%
450
11th to 20thDay
48%30%40%13%5%
450
21st to endDay
8%14%23%35%14%6%
450
October1st to 10thDay
7%18%30%29%15%2
400
11th to 20thDay
7%13%30%36%12%3
270
21st to endDay
8%17%25%32%13%4
297
November1st to 10thDay
10%17%26%32%13%1
270
11th to 20thDay
10%13%31%28%14%4
270
21st to endDay
16%14%26%31%10%2
270
December1st to 10thDay
14%14%31%29%11%1
270
11th to 20thDay
7%15%33%30%11%3
270
21st to endDay
25%13%26%27%9%
297
January1st to 10thNight
11%9%29%30%14%6%
760
11th to 20thNight
12%10%28%31%16%3
760
21st to endNight
16%12%26%30%13%3
836
February1st to 10thNight
13%13%21%34%17%3
760
11th to 20thNight
13%10%33%31%12%1
744
21st to endNight
15%11%29%29%14%2
628
March1st to 10thNight
12%11%33%31%12%1
760
11th to 20thNight
13%9%23%32%19%5%
760
21st to endNight
9%11%27%35%18%2
800
April1st to 10thNight
6%10%32%35%15%3
720
11th to 20thNight
7%15%26%36%13%2
583
21st to endNight
5%13%29%35%16%3
540
May1st to 10thNight
5%10%24%42%18%1
540
11th to 20thNight
310%22%37%26%2
531
21st to endNight
49%27%37%21%3
584
June1st to 10thNight
25%20%44%27%2
540
11th to 20thNight
16%24%37%28%3
540
21st to endNight
3316%36%37%4
540
July1st to 10thNight
316%37%47%6%
525
11th to 20thNight
31324%55%14%
522
21st to endNight
42221%55%16%
591
August1st to 10thNight
31428%50%14%
537
11th to 20thNight
32331%51%10%
534
21st to endNight
31431%48%14%
652
September1st to 10thNight
427%32%42%12%
720
11th to 20thNight
4114%37%37%6%
720
21st to endNight
5%6%15%36%31%8%
720
October1st to 10thNight
7%7%24%39%22%2
720
11th to 20thNight
5%6%26%39%19%6%
720
21st to endNight
48%25%32%22%9%
792
November1st to 10thNight
7%6%25%39%18%5%
740
11th to 20thNight
47%30%37%18%5%
760
21st to endNight
11%9%26%35%15%4
760
December1st to 10thNight
13%9%23%34%19%2
760
11th to 20thNight
13%9%26%35%15%2
760
21st to endNight
15%11%27%32%12%3
836
Page generated at 2024-03-19 20:31:06. Version ac07

Copyright © 2024 Attilla Danko.


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