New Mexico Astronomy Village
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Mexico Astronomy Village clear sky chart from 2005-11-06 to 2024-03-01.

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
61%
23624
35%
79304
25%
23532
72%
23532
46%
37423

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
58%
752
41%
3978
29%
736
71%
736
35%
1555
January11th to 20thNight
57%
753
46%
3890
29%
740
72%
740
45%
1255
January21st to endNight
53%
828
25%
4283
27%
814
71%
814
26%
2168
February1st to 10thNight
55%
760
38%
2470
27%
760
72%
760
52%
1107
February11th to 20thNight
47%
740
36%
2254
23%
740
63%
740
50%
1076
February21st to endNight
38%
628
40%
1756
18%
628
59%
628
54%
860
March1st to 10thNight
42%
722
40%
1985
17%
722
62%
722
51%
984
March11th to 20thNight
51%
720
38%
1980
18%
720
67%
720
55%
966
March21st to endNight
47%
792
40%
2178
17%
792
65%
792
55%
1058
April1st to 10thNight
45%
586
41%
1846
19%
586
69%
586
59%
774
April11th to 20thNight
42%
533
40%
1777
22%
533
67%
533
54%
745
April21st to endNight
42%
540
44%
1800
22%
540
72%
540
56%
715
May1st to 10thNight
50%
540
38%
1800
25%
540
71%
540
60%
732
May11th to 20thNight
56%
531
34%
1681
24%
531
70%
531
56%
744
May21st to endNight
54%
584
39%
1746
25%
582
69%
582
62%
754
June1st to 10thNight
64%
540
33%
1620
25%
540
71%
540
54%
768
June11th to 20thNight
67%
540
34%
1620
26%
540
74%
540
60%
723
June21st to endNight
72%
540
22%
1620
20%
540
74%
540
41%
898
July1st to 10thNight
75%
525
21%
1575
18%
525
76%
525
37%
891
July11th to 20thNight
75%
522
19%
1566
17%
522
75%
522
29%
989
July21st to endNight
72%
591
18%
1674
18%
558
72%
558
29%
1048
August1st to 10thNight
78%
537
17%
1619
17%
534
78%
534
30%
996
August11th to 20thNight
75%
534
23%
1778
25%
534
77%
534
28%
1078
August21st to endNight
77%
594
23%
1980
27%
594
78%
594
30%
1153
September1st to 10thNight
74%
540
27%
1800
31%
540
75%
540
33%
1033
September11th to 20thNight
79%
593
36%
1853
35%
593
81%
593
44%
962
September21st to endNight
76%
720
35%
2038
25%
720
82%
720
56%
999
October1st to 10thNight
69%
720
34%
2160
24%
720
75%
720
51%
1062
October11th to 20thNight
73%
720
42%
2160
30%
720
81%
720
63%
950
October21st to endNight
72%
792
45%
2376
31%
792
81%
792
67%
1006
November1st to 10thNight
74%
740
45%
2220
32%
740
83%
740
65%
938
November11th to 20thNight
70%
760
43%
2280
30%
760
81%
760
62%
1012
November21st to endNight
57%
760
42%
2280
28%
760
70%
760
48%
1137
December1st to 10thNight
61%
760
40%
2432
31%
760
73%
760
49%
1162
December11th to 20thNight
55%
759
34%
2914
26%
759
68%
759
37%
1434
December21st to endNight
54%
828
25%
4315
29%
817
66%
817
34%
1691

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
431332445%7%64%
79057
Night
431332445%7%64%
80421
TransparencyDay
20%45%15%28%28%
78784
Night
21%46%16%28%26%
80215
SeeingDay
6%8%21%30%24%11%
13517
Night
5%423%40%23%4
23660

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
341342345%5%66%
2858
11th to 20thDay
321121345%7%71%
2860
21st to endDay
8%42432346%6%57%
3146
February1st to 10thDay
3313323336%69%
1710
11th to 20thDay
6%212323436%66%
1811
21st to endDay
4412322345%69%
1694
March1st to 10thDay
432432445%5%64%
1981
11th to 20thDay
5%312323435%70%
1980
21st to endDay
2112224447%70%
2178
April1st to 10thDay
2113222346%74%
2113
11th to 20thDay
321121222479%
2131
21st to endDay
2211211235%80%
2160
May1st to 10thDay
212223235%78%
2160
11th to 20thDay
221331335%473%
2210
21st to endDay
21121233480%
2530
June1st to 10thDay
3213323347%69%
2340
11th to 20thDay
211222335%5%75%
2340
21st to endDay
5%3135%245%6%8%58%
2340
July1st to 10thDay
6%3245%45%6%7%9%48%
2340
11th to 20thDay
6%325%7%46%6%8%11%42%
2340
21st to endDay
7%425%6%6%8%8%9%11%34%
2545
August1st to 10thDay
5%325%7%45%7%8%10%43%
2311
11th to 20thDay
6%325%6%5%6%6%7%10%44%
2123
21st to endDay
6%3245%35%7%8%10%48%
2376
September1st to 10thDay
8%3246%35%5%7%8%49%
2160
11th to 20thDay
6%31432445%8%61%
2102
21st to endDay
3213322346%70%
1920
October1st to 10thDay
4213323447%67%
1800
11th to 20thDay
331332233474%
1800
21st to endDay
2211222335%79%
1980
November1st to 10thDay
2212323346%73%
1859
11th to 20thDay
2313323335%71%
1900
21st to endDay
6%423323447%63%
1900
December1st to 10thDay
6%32424447%64%
1744
11th to 20thDay
5%6%24424336%58%
2169
21st to endDay
331232345%8%66%
3146
January1st to 10thNight
45%23323346%64%
4097
11th to 20thNight
3212223345%74%
4110
21st to endNight
10%5%2432445%6%54%
4521
February1st to 10thNight
3212323447%69%
2470
11th to 20thNight
5%412313336%68%
2254
21st to endNight
4312224446%68%
1756
March1st to 10thNight
431322446%6%66%
1985
11th to 20thNight
4212323335%71%
1980
21st to endNight
3213223345%71%
2178
April1st to 10thNight
1212222346%74%
1846
11th to 20thNight
3213312245%73%
1777
21st to endNight
211221343477%
1800
May1st to 10thNight
3212223245%76%
1800
11th to 20thNight
311332335%6%70%
1681
21st to endNight
2113212335%77%
1746
June1st to 10thNight
42133235%46%67%
1620
11th to 20thNight
211232435%5%72%
1620
21st to endNight
5%3245%36%5%8%9%51%
1620
July1st to 10thNight
6%424435%6%9%12%45%
1620
11th to 20thNight
4326%7%5%9%8%9%13%35%
1620
21st to endNight
5%436%7%46%7%8%14%36%
1773
August1st to 10thNight
4425%5%5%7%9%9%13%37%
1628
11th to 20thNight
6%425%6%5%7%8%8%13%38%
1778
21st to endNight
6%315%6%47%7%9%11%41%
1980
September1st to 10thNight
6%425%5%36%6%6%7%49%
1800
11th to 20thNight
5%3135%3446%7%58%
1853
21st to endNight
4213323346%70%
2038
October1st to 10thNight
5%213323446%66%
2160
11th to 20thNight
421221333476%
2160
21st to endNight
311221223479%
2376
November1st to 10thNight
2111223445%76%
2220
11th to 20thNight
3213222346%74%
2280
21st to endNight
7%313323346%65%
2280
December1st to 10thNight
6%31332345%7%64%
2432
11th to 20thNight
4325%4245%5%7%58%
3041
21st to endNight
6%413323345%65%
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
18%5%313%42%19%
2859
11th to 20thDay
13%4419%44%16%
2860
21st to endDay
25%6%424%28%14%
3146
February1st to 10thDay
17%3415%26%34%
1710
11th to 20thDay
20%2314%31%29%
1821
21st to endDay
19%329%30%37%
1694
March1st to 10thDay
22%3311%30%32%
1981
11th to 20thDay
19%3313%26%37%
1980
21st to endDay
15%2310%35%34%
2178
April1st to 10thDay
12%2210%36%37%
2113
11th to 20thDay
11%217%28%51%
2134
21st to endDay
10%129%32%46%
2160
May1st to 10thDay
11%229%24%52%
2160
11th to 20thDay
14%45%10%27%40%
2213
21st to endDay
9%229%24%54%
2530
June1st to 10thDay
16%3211%27%42%
2340
11th to 20thDay
11%326%20%58%
2340
21st to endDay
22%6%5%14%20%33%
2340
July1st to 10thDay
28%7%9%17%19%20%
2276
11th to 20thDay
30%8%13%24%16%9%
2271
21st to endDay
36%11%16%21%13%3
2404
August1st to 10thDay
31%8%14%24%17%7%
2296
11th to 20thDay
31%8%12%19%21%8%
2123
21st to endDay
28%8%12%22%20%11%
2376
September1st to 10thDay
30%5%10%18%22%15%
2160
11th to 20thDay
22%5%7%17%28%22%
2102
21st to endDay
16%35%16%34%25%
1920
October1st to 10thDay
18%47%15%24%32%
1800
11th to 20thDay
16%2311%28%40%
1800
21st to endDay
12%2217%34%34%
1980
November1st to 10thDay
14%2417%35%28%
1859
11th to 20thDay
17%2317%30%31%
1900
21st to endDay
22%4416%31%23%
1900
December1st to 10thDay
21%3422%31%19%
1744
11th to 20thDay
29%3420%28%16%
2168
21st to endDay
17%36%17%37%21%
3146
January1st to 10thNight
21%3314%43%15%
4097
11th to 20thNight
14%2220%46%15%
4110
21st to endNight
30%45%20%28%12%
4521
February1st to 10thNight
17%3418%27%31%
2470
11th to 20thNight
20%2216%31%29%
2254
21st to endNight
17%3411%30%35%
1756
March1st to 10thNight
19%3415%28%32%
1985
11th to 20thNight
17%3313%27%37%
1980
21st to endNight
17%2313%34%31%
2178
April1st to 10thNight
13%2312%35%36%
1846
11th to 20thNight
15%229%29%43%
1777
21st to endNight
12%2211%31%42%
1800
May1st to 10thNight
13%218%25%51%
1800
11th to 20thNight
15%36%11%24%41%
1682
21st to endNight
13%227%24%52%
1746
June1st to 10thNight
18%3311%24%40%
1620
11th to 20thNight
15%227%21%53%
1620
21st to endNight
27%6%8%14%15%31%
1620
July1st to 10thNight
28%7%13%19%17%16%
1575
11th to 20thNight
36%9%16%20%12%6%
1566
21st to endNight
36%8%21%21%11%3
1674
August1st to 10thNight
34%9%16%25%10%6%
1619
11th to 20thNight
35%9%16%17%16%8%
1778
21st to endNight
32%8%15%23%15%7%
1980
September1st to 10thNight
32%6%9%19%17%16%
1800
11th to 20thNight
23%5%8%18%25%20%
1853
21st to endNight
17%47%17%31%24%
2038
October1st to 10thNight
19%47%14%25%30%
2160
11th to 20thNight
14%2314%27%41%
2160
21st to endNight
11%2216%32%36%
2376
November1st to 10thNight
12%2316%35%32%
2220
11th to 20thNight
14%2318%32%31%
2280
21st to endNight
22%3417%31%24%
2280
December1st to 10thNight
21%35%23%27%22%
2432
11th to 20thNight
24%47%19%30%15%
3041
21st to endNight
21%3318%35%20%
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%7%27%37%13%3
270
11th to 20thDay
6%8%26%37%19%4
270
21st to endDay
5%7%28%36%16%8%
297
February1st to 10thDay
411%27%33%20%4
270
11th to 20thDay
12%8%31%36%11%2
270
21st to endDay
10%27%33%22%7%1
349
March1st to 10thDay
10%21%31%28%10%1
421
11th to 20thDay
10%16%28%31%12%3
420
21st to endDay
8%23%34%25%9%2
462
April1st to 10thDay
5%15%36%27%12%4
420
11th to 20thDay
7%19%34%26%12%2
412
21st to endDay
5%15%37%26%16%2
420
May1st to 10thDay
413%35%30%15%3
423
11th to 20thDay
39%29%34%21%4
448
21st to endDay
28%32%36%18%3
485
June1st to 10thDay
45%22%38%25%6%
450
11th to 20thDay
3422%38%26%8%
450
21st to endDay
4210%42%30%12%
450
July1st to 10thDay
7%15%29%34%25%
446
11th to 20thDay
7%1221%39%30%
444
21st to endDay
5%1316%45%30%
487
August1st to 10thDay
5%2218%39%33%
447
11th to 20thDay
5%35%24%40%23%
437
21st to endDay
426%21%39%28%
495
September1st to 10thDay
10%25%30%36%16%
450
11th to 20thDay
5%110%32%36%16%
450
21st to endDay
4414%38%31%10%
390
October1st to 10thDay
7%416%33%27%14%
270
11th to 20thDay
8%5%16%33%30%8%
270
21st to endDay
46%17%32%28%14%
297
November1st to 10thDay
6%427%36%21%6%
270
11th to 20thDay
35%17%39%29%7%
270
21st to endDay
9%11%23%35%18%4
270
December1st to 10thDay
6%6%23%36%24%5%
270
11th to 20thDay
9%7%30%33%17%3
270
21st to endDay
8%10%30%35%14%3
297
January1st to 10thNight
6%5%27%41%17%4
760
11th to 20thNight
6%429%39%18%4
760
21st to endNight
10%5%26%41%15%3
836
February1st to 10thNight
46%32%38%16%4
760
11th to 20thNight
7%6%34%39%11%2
744
21st to endNight
6%9%45%31%8%1
628
March1st to 10thNight
6%9%40%34%10%1
722
11th to 20thNight
7%7%30%39%14%2
720
21st to endNight
5%9%36%38%11%1
792
April1st to 10thNight
28%42%39%9%1
586
11th to 20thNight
49%42%33%11%1
533
21st to endNight
113%40%35%10%1
540
May1st to 10thNight
46%38%45%7%1
540
11th to 20thNight
4431%45%15%1
531
21st to endNight
35%34%47%12%1
584
June1st to 10thNight
5%223%51%18%1
540
11th to 20thNight
2423%53%17%1
540
21st to endNight
5%213%46%33%1
540
July1st to 10thNight
7%26%38%43%5%
525
11th to 20thNight
32330%54%8%
522
21st to endNight
6%1225%56%10%
591
August1st to 10thNight
42224%56%12%
537
11th to 20thNight
5%25%30%49%9%
534
21st to endNight
5%1327%56%8%
594
September1st to 10thNight
6%2435%51%3
540
11th to 20thNight
7%16%43%39%5%
593
21st to endNight
4112%45%33%5%
720
October1st to 10thNight
6%217%47%25%3
720
11th to 20thNight
4218%50%22%4
720
21st to endNight
3319%42%25%8%
792
November1st to 10thNight
4219%43%26%7%
740
11th to 20thNight
3320%45%25%3
760
21st to endNight
8%424%39%19%5%
760
December1st to 10thNight
6%325%43%19%4
760
11th to 20thNight
6%428%45%14%3
760
21st to endNight
8%6%26%41%16%3
836
Page generated at 2024-02-27 04:30:12. Version ac07

Copyright © 2024 Attilla Danko.


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