Zuni
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Zuni clear sky chart from 2005-11-06 to 2024-01-14.

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
63%
23558
31%
74247
25%
23506
70%
23506
42%
37995

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
62%
760
32%
2457
29%
756
69%
756
43%
1243
January11th to 20thNight
58%
736
33%
2391
30%
736
66%
736
42%
1213
January21st to endNight
58%
792
34%
2574
30%
792
68%
792
38%
1366
February1st to 10thNight
59%
720
32%
2340
29%
720
67%
720
46%
1130
February11th to 20thNight
51%
701
27%
2244
22%
700
61%
700
38%
1205
February21st to endNight
48%
592
39%
1640
25%
592
62%
592
46%
876
March1st to 10thNight
52%
720
35%
1980
22%
720
63%
720
49%
1044
March11th to 20thNight
58%
720
35%
1980
22%
720
68%
720
48%
1053
March21st to endNight
53%
792
32%
2178
18%
792
63%
792
44%
1203
April1st to 10thNight
50%
612
34%
1872
18%
612
65%
612
48%
898
April11th to 20thNight
48%
533
35%
1777
22%
533
67%
533
45%
819
April21st to endNight
47%
540
36%
1800
23%
540
66%
540
47%
817
May1st to 10thNight
55%
540
33%
1688
23%
540
68%
540
49%
794
May11th to 20thNight
58%
531
29%
1594
21%
531
66%
531
44%
815
May21st to endNight
59%
582
33%
1746
23%
582
69%
582
56%
781
June1st to 10thNight
66%
540
31%
1620
27%
540
69%
540
53%
766
June11th to 20thNight
69%
540
34%
1620
27%
540
74%
540
63%
704
June21st to endNight
71%
540
25%
1620
24%
540
73%
540
45%
833
July1st to 10thNight
72%
525
18%
1575
16%
525
73%
525
33%
919
July11th to 20thNight
72%
522
14%
1566
12%
522
73%
522
25%
993
July21st to endNight
69%
591
11%
1674
10%
558
69%
558
17%
1195
August1st to 10thNight
76%
537
17%
1602
16%
534
76%
534
30%
960
August11th to 20thNight
70%
534
17%
1672
17%
534
70%
534
23%
1090
August21st to endNight
77%
594
23%
1980
25%
594
78%
594
32%
1126
September1st to 10thNight
68%
540
28%
1800
29%
540
70%
540
29%
1062
September11th to 20thNight
77%
665
35%
1925
29%
665
81%
665
47%
1031
September21st to endNight
70%
720
35%
2001
23%
720
77%
720
52%
1023
October1st to 10thNight
66%
720
31%
2160
21%
720
73%
720
49%
1080
October11th to 20thNight
73%
720
42%
2160
30%
720
81%
720
64%
932
October21st to endNight
69%
792
43%
2376
31%
792
78%
792
58%
1086
November1st to 10thNight
72%
740
41%
2220
32%
740
79%
740
59%
993
November11th to 20thNight
71%
760
42%
2280
34%
760
79%
760
59%
1029
November21st to endNight
61%
760
36%
2441
30%
760
70%
760
45%
1193
December1st to 10thNight
64%
760
35%
2470
32%
760
70%
760
45%
1213
December11th to 20thNight
57%
760
30%
2922
28%
759
64%
759
32%
1576
December21st to endNight
55%
827
21%
4302
26%
817
63%
817
26%
1934

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
442443445%7%59%
74971
Night
45%2442445%6%60%
74791
TransparencyDay
25%5%7%17%27%19%
74697
Night
24%5%8%18%27%18%
74586
SeeingDay
7%10%22%28%22%10%
13422
Night
6%420%40%26%3
23572

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%2342435%7%58%
1708
11th to 20thDay
5%7%24333345%62%
1647
21st to endDay
48%34323346%58%
1782
February1st to 10thDay
28%34433346%61%
1620
11th to 20thDay
38%46%5%245%5%7%53%
1602
21st to endDay
48%25%5%3435%7%55%
1613
March1st to 10thDay
46%25%32446%8%54%
1980
11th to 20thDay
38%25%434347%56%
1980
21st to endDay
35%2442445%7%60%
2178
April1st to 10thDay
2324424447%64%
2088
11th to 20thDay
35%2342445%5%64%
2131
21st to endDay
3322433347%66%
2160
May1st to 10thDay
332342435%6%66%
2268
11th to 20thDay
341443446%6%60%
2301
21st to endDay
331232345%5%70%
2530
June1st to 10thDay
211332345%8%69%
2340
11th to 20thDay
2112222345%77%
2340
21st to endDay
22134346%6%6%63%
2340
July1st to 10thDay
3315%6%5%7%7%7%9%47%
2340
11th to 20thDay
5%425%7%47%7%8%10%42%
2340
21st to endDay
6%5%27%7%5%8%8%8%10%33%
2545
August1st to 10thDay
6%5%27%8%5%6%7%7%9%39%
2328
11th to 20thDay
6%5%25%6%5%7%6%8%9%42%
2228
21st to endDay
6%325%6%35%8%7%10%46%
2376
September1st to 10thDay
5%426%6%45%5%6%8%50%
2160
11th to 20thDay
432443445%5%62%
2031
21st to endDay
4313424446%67%
1958
October1st to 10thDay
6%324223346%65%
1800
11th to 20thDay
321221223378%
1800
21st to endDay
3213223335%72%
1980
November1st to 10thDay
2313322347%72%
1859
11th to 20thDay
2213323345%71%
1900
21st to endDay
45%23433336%64%
1736
December1st to 10thDay
5%6%25%223346%61%
1667
11th to 20thDay
6%7%45%6%3445%6%50%
2169
21st to endDay
48%24434445%56%
3146
January1st to 10thNight
46%2432345%7%59%
2457
11th to 20thNight
5%6%34423345%62%
2391
21st to endNight
5%7%25%423446%57%
2574
February1st to 10thNight
35%24323346%65%
2340
11th to 20thNight
5%8%34334446%56%
2243
21st to endNight
48%24323335%63%
1640
March1st to 10thNight
5%424323347%63%
1980
11th to 20thNight
46%23323445%64%
1980
21st to endNight
46%2432445%6%60%
2178
April1st to 10thNight
332432335%6%66%
1872
11th to 20thNight
441233335%5%66%
1777
21st to endNight
3423223347%67%
1800
May1st to 10thNight
241332335%6%66%
1688
11th to 20thNight
33245%3445%7%62%
1594
21st to endNight
3213213345%73%
1746
June1st to 10thNight
321332345%6%66%
1620
11th to 20thNight
2112222345%75%
1620
21st to endNight
3324435%5%5%7%59%
1620
July1st to 10thNight
3426%6%36%7%8%9%46%
1620
11th to 20thNight
5%5%37%6%47%8%10%11%35%
1620
21st to endNight
5%8%37%7%5%10%9%10%10%27%
1773
August1st to 10thNight
4325%7%46%7%9%10%44%
1611
11th to 20thNight
6%5%37%7%5%8%7%8%9%36%
1672
21st to endNight
5%325%5%46%6%7%9%47%
1980
September1st to 10thNight
5%5%26%8%5%5%7%6%8%44%
1800
11th to 20thNight
43244335%46%62%
1925
21st to endNight
4313323445%67%
2001
October1st to 10thNight
5%31332336%7%64%
2160
11th to 20thNight
221222223478%
2160
21st to endNight
2313322235%74%
2376
November1st to 10thNight
331332335%6%71%
2220
11th to 20thNight
2313312345%73%
2280
21st to endNight
46%23323445%64%
2441
December1st to 10thNight
6%5%23323446%63%
2470
11th to 20thNight
5%7%36%5%2445%8%52%
3041
21st to endNight
47%2442445%6%57%
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
25%48%25%28%10%
1709
11th to 20thDay
25%37%24%32%8%
1647
21st to endDay
27%36%20%33%10%
1782
February1st to 10thDay
26%29%20%28%15%
1620
11th to 20thDay
31%45%21%24%15%
1611
21st to endDay
29%35%18%28%17%
1613
March1st to 10thDay
26%46%16%33%15%
1980
11th to 20thDay
28%26%18%31%16%
1980
21st to endDay
23%47%20%33%14%
2178
April1st to 10thDay
21%35%18%33%19%
2088
11th to 20thDay
21%35%15%35%21%
2134
21st to endDay
18%36%18%37%18%
2160
May1st to 10thDay
19%3415%35%23%
2268
11th to 20thDay
25%5%6%12%30%22%
2304
21st to endDay
17%3413%33%30%
2530
June1st to 10thDay
13%45%11%31%35%
2340
11th to 20thDay
12%238%24%51%
2340
21st to endDay
19%5%7%11%23%34%
2340
July1st to 10thDay
30%9%9%16%14%23%
2276
11th to 20thDay
33%10%16%20%12%9%
2271
21st to endDay
40%11%19%18%9%2
2404
August1st to 10thDay
38%10%14%13%14%12%
2313
11th to 20thDay
34%8%12%18%16%11%
2228
21st to endDay
30%9%11%20%22%8%
2376
September1st to 10thDay
31%6%9%17%20%17%
2160
11th to 20thDay
23%5%6%16%25%25%
2031
21st to endDay
19%47%14%30%26%
1958
October1st to 10thDay
22%36%20%24%24%
1800
11th to 20thDay
13%2311%37%34%
1800
21st to endDay
16%36%17%41%18%
1980
November1st to 10thDay
14%25%24%36%19%
1859
11th to 20thDay
17%36%20%38%17%
1900
21st to endDay
24%26%19%32%17%
1736
December1st to 10thDay
25%38%25%24%14%
1667
11th to 20thDay
35%5%8%20%23%9%
2168
21st to endDay
29%47%22%22%16%
3146
January1st to 10thNight
25%48%25%30%9%
2457
11th to 20thNight
26%36%24%31%10%
2391
21st to endNight
29%36%19%31%11%
2574
February1st to 10thNight
22%39%22%29%15%
2340
11th to 20thNight
30%36%22%23%17%
2244
21st to endNight
24%36%17%34%16%
1640
March1st to 10thNight
23%35%22%32%16%
1980
11th to 20thNight
23%36%18%35%15%
1980
21st to endNight
25%46%21%30%14%
2178
April1st to 10thNight
20%3421%35%17%
1872
11th to 20thNight
20%35%16%34%22%
1777
21st to endNight
18%46%16%36%19%
1800
May1st to 10thNight
19%36%16%34%22%
1688
11th to 20thNight
21%6%9%16%30%19%
1595
21st to endNight
14%46%13%35%29%
1746
June1st to 10thNight
18%45%10%28%35%
1620
11th to 20thNight
12%339%22%51%
1620
21st to endNight
23%5%7%15%19%32%
1620
July1st to 10thNight
30%9%13%14%12%22%
1575
11th to 20thNight
34%13%17%19%8%9%
1566
21st to endNight
45%14%21%13%6%2
1674
August1st to 10thNight
31%11%19%14%14%12%
1602
11th to 20thNight
39%11%16%12%12%10%
1672
21st to endNight
29%9%15%20%17%9%
1980
September1st to 10thNight
34%7%12%18%13%16%
1800
11th to 20thNight
21%6%9%17%24%23%
1925
21st to endNight
20%46%14%28%28%
2001
October1st to 10thNight
20%5%9%18%23%26%
2160
11th to 20thNight
12%2413%34%35%
2160
21st to endNight
15%3418%38%22%
2376
November1st to 10thNight
15%35%23%35%20%
2220
11th to 20thNight
15%35%20%36%21%
2280
21st to endNight
23%35%18%33%18%
2441
December1st to 10thNight
24%37%27%25%14%
2470
11th to 20thNight
31%49%20%26%10%
3041
21st to endNight
27%46%21%24%17%
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
11%9%31%33%15%2
270
11th to 20thDay
14%9%24%28%20%5%
249
21st to endDay
5%10%28%32%17%8%
264
February1st to 10thDay
48%28%38%16%6%
240
11th to 20thDay
13%14%27%35%11%1
240
21st to endDay
11%21%35%23%7%3
331
March1st to 10thDay
12%19%30%24%13%2
420
11th to 20thDay
11%17%28%23%16%4
420
21st to endDay
11%25%32%21%8%3
462
April1st to 10thDay
6%16%34%26%14%5%
420
11th to 20thDay
11%19%33%22%12%3
412
21st to endDay
7%19%32%25%13%4
420
May1st to 10thDay
7%14%32%32%14%2
423
11th to 20thDay
5%11%30%30%17%7%
448
21st to endDay
6%15%29%28%16%5%
485
June1st to 10thDay
38%24%33%23%9%
450
11th to 20thDay
48%24%29%23%12%
450
21st to endDay
2422%37%24%9%
450
July1st to 10thDay
4212%30%36%17%
446
11th to 20thDay
7%2424%35%28%
444
21st to endDay
6%3423%37%27%
487
August1st to 10thDay
8%37%23%38%21%
447
11th to 20thDay
7%412%26%29%22%
437
21st to endDay
7%18%28%30%26%
495
September1st to 10thDay
6%413%25%35%18%
450
11th to 20thDay
3219%33%33%10%
450
21st to endDay
6%7%18%29%27%13%
428
October1st to 10thDay
5%8%23%23%23%17%
270
11th to 20thDay
6%9%16%33%24%13%
270
21st to endDay
6%7%18%27%31%11%
297
November1st to 10thDay
49%25%35%20%6%
270
11th to 20thDay
5%6%16%34%27%11%
270
21st to endDay
7%14%24%28%20%7%
270
December1st to 10thDay
11%7%21%30%25%6%
270
11th to 20thDay
7%10%27%32%19%6%
270
21st to endDay
17%11%27%28%15%3
297
January1st to 10thNight
8%322%42%23%3
760
11th to 20thNight
8%5%24%41%19%3
736
21st to endNight
9%5%21%43%18%3
792
February1st to 10thNight
6%5%26%42%20%3
720
11th to 20thNight
10%5%28%42%13%1
704
21st to endNight
9%8%31%41%11%
592
March1st to 10thNight
6%8%30%41%14%1
720
11th to 20thNight
8%8%22%41%20%2
720
21st to endNight
7%8%28%42%15%1
792
April1st to 10thNight
49%33%39%14%1
612
11th to 20thNight
7%10%32%36%14%1
533
21st to endNight
48%36%37%14%1
540
May1st to 10thNight
45%31%45%14%1
540
11th to 20thNight
46%25%42%22%1
531
21st to endNight
45%26%44%19%1
584
June1st to 10thNight
4419%50%22%1
540
11th to 20thNight
2421%49%23%1
540
21st to endNight
4214%44%33%2
540
July1st to 10thNight
5%17%39%45%3
525
11th to 20thNight
6%2327%54%8%
522
21st to endNight
8%2224%53%11%
591
August1st to 10thNight
41424%54%12%
537
11th to 20thNight
7%25%31%48%7%
534
21st to endNight
6%1428%53%8%
594
September1st to 10thNight
5%38%41%40%3
540
11th to 20thNight
4110%40%40%5%
665
21st to endNight
5%314%37%35%5%
720
October1st to 10thNight
6%319%43%26%3
720
11th to 20thNight
3317%46%27%4
720
21st to endNight
4219%39%29%6%
792
November1st to 10thNight
3318%43%29%4
740
11th to 20thNight
5%219%42%27%5%
760
21st to endNight
9%6%19%35%27%3
760
December1st to 10thNight
9%418%44%22%3
760
11th to 20thNight
10%5%22%42%21%1
760
21st to endNight
10%6%23%44%15%2
836
Page generated at 2024-01-11 11:32:04. Version ac07

Copyright 2024 Attilla Danko


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