Dark Sky New Mexico
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dark Sky New Mexico clear sky chart from 2005-11-06 to 2025-04-26.

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
66%
24994
35%
110593
27%
24723
75%
24723
41%
44593

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
61%
782
42%
5573
31%
756
73%
756
29%
1869
January11th to 20thNight
66%
782
37%
5360
35%
760
76%
760
49%
1233
January21st to endNight
56%
864
34%
5856
30%
836
71%
836
24%
2422
February1st to 10thNight
63%
800
39%
2600
33%
800
76%
800
55%
1139
February11th to 20thNight
54%
780
34%
2362
24%
780
67%
780
53%
1097
February21st to endNight
50%
660
43%
1815
27%
660
66%
660
57%
874
March1st to 10thNight
52%
788
46%
4131
24%
764
68%
764
42%
1369
March11th to 20thNight
55%
785
36%
4243
22%
760
70%
760
44%
1351
March21st to endNight
58%
859
31%
4515
20%
836
73%
836
36%
1786
April1st to 10thNight
59%
714
41%
2114
25%
714
75%
714
62%
915
April11th to 20thNight
55%
593
40%
1977
27%
593
75%
593
59%
792
April21st to endNight
58%
587
44%
1955
31%
587
79%
587
65%
747
May1st to 10thNight
61%
563
50%
2905
30%
559
76%
559
62%
745
May11th to 20thNight
64%
550
35%
2745
29%
541
73%
541
53%
817
May21st to endNight
68%
607
32%
3054
34%
593
78%
593
70%
719
June1st to 10thNight
76%
570
36%
1710
32%
570
79%
570
60%
764
June11th to 20thNight
75%
570
35%
1710
30%
570
78%
570
65%
729
June21st to endNight
75%
570
23%
1710
21%
570
76%
570
41%
929
July1st to 10thNight
74%
537
24%
2498
18%
535
75%
535
24%
1299
July11th to 20thNight
73%
537
15%
2419
12%
533
74%
533
18%
1459
July21st to endNight
72%
606
9%
2874
11%
569
72%
569
13%
1931
August1st to 10thNight
76%
554
17%
2649
16%
545
76%
545
18%
1590
August11th to 20thNight
75%
549
17%
2779
23%
544
76%
544
18%
1586
August21st to endNight
77%
606
16%
3288
23%
605
77%
605
18%
1888
September1st to 10thNight
74%
570
26%
1900
29%
570
75%
570
31%
1101
September11th to 20thNight
79%
743
33%
2073
29%
743
80%
743
49%
1118
September21st to endNight
76%
760
36%
2099
26%
760
82%
760
56%
1053
October1st to 10thNight
75%
740
49%
3325
27%
740
80%
740
51%
1123
October11th to 20thNight
75%
744
31%
3305
29%
740
83%
740
51%
1208
October21st to endNight
77%
818
49%
3747
35%
813
85%
813
67%
1046
November1st to 10thNight
75%
780
47%
2340
35%
780
84%
780
69%
966
November11th to 20thNight
73%
800
41%
2400
31%
800
82%
800
63%
1050
November21st to endNight
59%
800
41%
2417
29%
800
70%
800
50%
1175
December1st to 10thNight
65%
789
47%
3901
34%
780
74%
780
44%
1339
December11th to 20thNight
61%
783
25%
4377
29%
778
73%
778
37%
1564
December21st to endNight
58%
854
36%
5867
30%
839
70%
839
33%
1800

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
221333335%7%67%
118142
Night
231333435%7%66%
119420
TransparencyDay
17%36%14%28%31%
117905
Night
18%46%14%29%29%
119246
SeeingDay
6%9%20%31%24%10%
15209
Night
4419%44%26%3
25334

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
2414333347%65%
4098
11th to 20thDay
122222235%78%
4100
21st to endDay
442423335%8%63%
4510
February1st to 10thDay
3313224346%69%
1800
11th to 20thDay
4413324346%66%
1919
21st to endDay
3213333246%70%
1815
March1st to 10thDay
121322335%6%73%
4954
11th to 20thDay
221322335%7%70%
5000
21st to endDay
131433436%9%64%
5486
April1st to 10thDay
121222235%6%74%
2285
11th to 20thDay
221112124480%
2371
21st to endDay
1111212225%80%
2341
May1st to 10thDay
111111212386%
3800
11th to 20thDay
12222345%79%
4033
21st to endDay
11111112388%
4477
June1st to 10thDay
2212333347%70%
2470
11th to 20thDay
222222345%76%
2470
21st to endDay
341445%5%5%7%8%54%
2470
July1st to 10thDay
221435%5%5%7%10%56%
4110
11th to 20thDay
221445%6%5%8%11%52%
4110
21st to endDay
5%426%5%6%7%6%10%13%36%
4454
August1st to 10thDay
3325%46%6%6%8%11%46%
4092
11th to 20thDay
231445%5%46%11%53%
3768
21st to endDay
3325%5%6%7%6%9%11%44%
4180
September1st to 10thDay
6%425%5%5%6%5%6%8%49%
2280
11th to 20thDay
42145%45%46%7%58%
2102
21st to endDay
3313233347%68%
2081
October1st to 10thDay
112222246%78%
3170
11th to 20thDay
221222223380%
3150
21st to endDay
11111212387%
3438
November1st to 10thDay
1213222246%76%
1959
11th to 20thDay
121322235%6%74%
2000
21st to endDay
4423333347%64%
1980
December1st to 10thDay
35%1332334469%
2950
11th to 20thDay
2324333246%69%
3409
21st to endDay
2213223246%72%
4510
January1st to 10thNight
241433335%7%65%
5867
11th to 20thNight
111212123481%
5880
21st to endNight
6%42433335%6%60%
6468
February1st to 10thNight
221333336%6%69%
2600
11th to 20thNight
4414222246%69%
2362
21st to endNight
121323435%6%70%
1815
March1st to 10thNight
2212233346%73%
4940
11th to 20thNight
221222225%6%73%
5000
21st to endNight
231333435%7%67%
5489
April1st to 10thNight
1312233245%75%
2114
11th to 20thNight
2213222346%75%
1977
21st to endNight
12212223481%
1955
May1st to 10thNight
111211122386%
3170
11th to 20thNight
2213222245%76%
2867
21st to endNight
1111112389%
3110
June1st to 10thNight
3213222246%72%
1710
11th to 20thNight
2213223346%74%
1710
21st to endNight
4325%45%6%6%8%8%51%
1710
July1st to 10thNight
2325%5%6%6%7%8%10%46%
2860
11th to 20thNight
2326%7%7%9%8%11%13%33%
2860
21st to endNight
45%39%7%9%10%8%11%14%20%
3109
August1st to 10thNight
3428%7%7%8%7%10%12%34%
2847
11th to 20thNight
3326%6%6%8%7%10%12%37%
3067
21st to endNight
3427%6%7%8%7%10%11%34%
3487
September1st to 10thNight
6%5%26%5%5%5%5%7%9%45%
1900
11th to 20thNight
431444445%7%59%
2073
21st to endNight
222433425%5%69%
2099
October1st to 10thNight
121222223478%
3800
11th to 20thNight
2212222235%76%
3778
21st to endNight
11111213485%
4120
November1st to 10thNight
212122237%77%
2340
11th to 20thNight
2212222245%75%
2400
21st to endNight
431433435%7%64%
2417
December1st to 10thNight
431212224474%
4240
11th to 20thNight
121334435%6%68%
4811
21st to endNight
331322335%5%70%
6468

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
20%2412%40%22%
4099
11th to 20thDay
10%3313%43%28%
4100
21st to endDay
19%45%17%28%26%
4510
February1st to 10thDay
18%3413%29%33%
1800
11th to 20thDay
20%3415%31%27%
1928
21st to endDay
17%2311%28%39%
1815
March1st to 10thDay
12%229%34%40%
4954
11th to 20thDay
13%4416%33%30%
5000
21st to endDay
15%5%412%35%28%
5486
April1st to 10thDay
11%239%36%39%
2285
11th to 20thDay
10%126%28%53%
2374
21st to endDay
9%129%29%49%
2341
May1st to 10thDay
7%115%20%65%
3800
11th to 20thDay
8%248%28%50%
4036
21st to endDay
6%11415%74%
4477
June1st to 10thDay
14%337%28%45%
2470
11th to 20thDay
12%226%19%60%
2470
21st to endDay
25%5%8%13%19%30%
2470
July1st to 10thDay
21%5%13%14%19%27%
4046
11th to 20thDay
22%7%14%26%23%9%
4041
21st to endDay
34%7%21%26%10%1
4314
August1st to 10thDay
28%7%16%25%19%5%
4078
11th to 20thDay
25%6%11%21%29%9%
3804
21st to endDay
31%6%15%22%17%9%
4179
September1st to 10thDay
31%6%11%15%20%17%
2280
11th to 20thDay
24%5%6%17%26%23%
2102
21st to endDay
17%4417%32%26%
2081
October1st to 10thDay
9%2410%23%51%
3170
11th to 20thDay
12%2211%30%43%
3150
21st to endDay
6%1211%33%47%
3438
November1st to 10thDay
12%2418%36%29%
1959
11th to 20thDay
13%2418%34%30%
2000
21st to endDay
21%35%19%29%23%
1980
December1st to 10thDay
19%3417%37%20%
2950
11th to 20thDay
19%2414%39%22%
3408
21st to endDay
13%45%17%42%19%
4510
January1st to 10thNight
19%3412%46%16%
5867
11th to 20thNight
9%2316%44%27%
5880
21st to endNight
23%5%5%16%26%26%
6468
February1st to 10thNight
16%3415%28%34%
2600
11th to 20thNight
18%2417%32%27%
2363
21st to endNight
15%3412%28%37%
1815
March1st to 10thNight
13%349%34%38%
4940
11th to 20thNight
11%3418%37%27%
5000
21st to endNight
15%5%415%34%27%
5489
April1st to 10thNight
13%2312%36%35%
2114
11th to 20thNight
11%329%29%46%
1977
21st to endNight
10%229%32%45%
1955
May1st to 10thNight
7%115%24%62%
3170
11th to 20thNight
10%348%24%52%
2868
21st to endNight
5%11417%71%
3110
June1st to 10thNight
15%236%29%44%
1710
11th to 20thNight
13%236%20%57%
1710
21st to endNight
26%6%9%13%17%29%
1710
July1st to 10thNight
28%7%12%15%19%20%
2815
11th to 20thNight
34%9%15%23%11%8%
2806
21st to endNight
47%8%21%17%5%1
3011
August1st to 10thNight
38%7%18%21%12%4
2838
11th to 20thNight
34%7%14%16%22%6%
3097
21st to endNight
37%7%21%17%12%6%
3487
September1st to 10thNight
32%7%14%14%18%15%
1900
11th to 20thNight
22%5%8%18%24%22%
2073
21st to endNight
18%46%16%34%23%
2099
October1st to 10thNight
11%349%23%50%
3800
11th to 20thNight
13%3313%23%46%
3778
21st to endNight
6%129%31%50%
4120
November1st to 10thNight
10%2418%36%30%
2340
11th to 20thNight
13%2418%32%30%
2400
21st to endNight
20%36%16%31%23%
2417
December1st to 10thNight
15%2418%42%18%
4240
11th to 20thNight
18%25%13%37%25%
4811
21st to endNight
15%3417%40%21%
6468

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
10%10%28%35%15%3
300
11th to 20thDay
7%426%41%18%4
300
21st to endDay
6%12%24%37%17%4
330
February1st to 10thDay
5%10%22%34%24%5%
300
11th to 20thDay
13%14%25%33%14%1
367
21st to endDay
11%23%35%22%8%1
414
March1st to 10thDay
7%22%33%27%10%2
500
11th to 20thDay
10%18%29%27%11%4
500
21st to endDay
9%21%31%25%12%3
550
April1st to 10thDay
6%14%31%28%16%5%
500
11th to 20thDay
422%29%27%14%3
492
21st to endDay
5%17%32%28%15%4
481
May1st to 10thDay
5%16%31%28%16%5%
463
11th to 20thDay
311%27%33%20%6%
488
21st to endDay
39%32%33%20%3
529
June1st to 10thDay
4424%34%26%7%
490
11th to 20thDay
2320%39%25%11%
490
21st to endDay
5%49%37%33%12%
490
July1st to 10thDay
42431%44%15%
486
11th to 20thDay
42224%45%23%
484
21st to endDay
6%2323%40%25%
531
August1st to 10thDay
6%2221%35%34%
487
11th to 20thDay
5%2427%41%21%
477
21st to endDay
415%23%41%26%
539
September1st to 10thDay
8%19%35%32%14%
490
11th to 20thDay
329%33%36%16%
490
21st to endDay
5%5%16%32%29%13%
481
October1st to 10thDay
3417%29%32%16%
300
11th to 20thDay
6%6%18%33%25%13%
300
21st to endDay
37%18%30%27%14%
330
November1st to 10thDay
48%24%35%22%6%
300
11th to 20thDay
26%22%35%28%7%
300
21st to endDay
7%10%29%32%18%3
300
December1st to 10thDay
7%5%24%39%20%5%
300
11th to 20thDay
6%8%27%40%15%3
300
21st to endDay
8%8%29%34%16%5%
330
January1st to 10thNight
5%323%47%20%2
800
11th to 20thNight
4322%48%20%2
800
21st to endNight
7%5%25%44%17%2
880
February1st to 10thNight
36%25%42%22%3
800
11th to 20thNight
6%7%29%45%12%1
784
21st to endNight
39%35%42%11%
660
March1st to 10thNight
48%33%44%11%1
800
11th to 20thNight
46%31%40%16%3
800
21st to endNight
37%27%46%15%1
880
April1st to 10thNight
36%28%47%14%1
714
11th to 20thNight
38%31%45%13%1
593
21st to endNight
27%30%46%13%2
587
May1st to 10thNight
2428%51%14%1
570
11th to 20thNight
3423%52%18%1
561
21st to endNight
2223%54%18%
617
June1st to 10thNight
4112%58%24%1
570
11th to 20thNight
2116%54%26%1
570
21st to endNight
428%46%38%2
570
July1st to 10thNight
5%16%39%45%4
555
11th to 20thNight
6%334%49%7%
552
21st to endNight
5%1328%54%9%
624
August1st to 10thNight
5%2125%55%11%
567
11th to 20thNight
6%1426%55%8%
564
21st to endNight
5%2329%52%9%
627
September1st to 10thNight
8%2438%47%3
570
11th to 20thNight
6%16%37%45%5%
743
21st to endNight
3111%44%36%5%
760
October1st to 10thNight
3113%47%33%3
760
11th to 20thNight
4116%50%26%3
760
21st to endNight
3313%43%32%6%
836
November1st to 10thNight
2317%47%25%6%
780
11th to 20thNight
2418%48%26%2
800
21st to endNight
6%425%43%20%3
800
December1st to 10thNight
6%321%47%20%3
800
11th to 20thNight
35%24%47%20%1
800
21st to endNight
6%6%24%44%17%4
880
Page generated at 2025-04-23 07:25:01. Version ac07

Copyright © 2025 Attilla Danko.


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