Alamogordo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Alamogordo 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
58%
23863
31%
74483
21%
23816
68%
23816
42%
38497

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
54%
757
32%
2456
23%
756
66%
756
40%
1276
January11th to 20thNight
51%
720
31%
2340
25%
720
62%
720
42%
1182
January21st to endNight
48%
792
34%
2574
22%
792
64%
792
40%
1344
February1st to 10thNight
50%
720
35%
2214
22%
720
64%
720
47%
1094
February11th to 20thNight
40%
701
30%
2098
16%
700
53%
700
41%
1125
February21st to endNight
34%
592
34%
1776
15%
592
53%
592
42%
926
March1st to 10thNight
40%
720
33%
2044
15%
720
56%
720
40%
1130
March11th to 20thNight
49%
720
32%
1980
16%
720
61%
720
45%
1072
March21st to endNight
42%
723
36%
2109
16%
723
60%
723
47%
1064
April1st to 10thNight
38%
540
37%
1800
18%
540
61%
540
47%
827
April11th to 20thNight
40%
533
32%
1777
18%
533
60%
533
41%
844
April21st to endNight
39%
540
39%
1800
21%
540
65%
540
47%
829
May1st to 10thNight
45%
540
33%
1800
23%
540
64%
540
51%
795
May11th to 20thNight
58%
531
29%
1770
25%
531
69%
531
48%
826
May21st to endNight
56%
582
32%
1811
21%
582
71%
582
54%
834
June1st to 10thNight
68%
540
28%
1440
22%
540
72%
540
46%
801
June11th to 20thNight
71%
540
36%
1440
27%
540
77%
540
60%
715
June21st to endNight
75%
540
21%
1540
19%
540
77%
540
36%
909
July1st to 10thNight
78%
525
21%
1575
20%
525
78%
525
34%
917
July11th to 20thNight
82%
522
22%
1566
21%
522
82%
522
37%
891
July21st to endNight
83%
591
19%
1674
18%
558
83%
558
31%
1020
August1st to 10thNight
81%
537
17%
1766
20%
534
81%
534
31%
1048
August11th to 20thNight
80%
534
22%
1778
24%
534
81%
534
30%
1040
August21st to endNight
80%
594
23%
1980
27%
594
81%
594
32%
1137
September1st to 10thNight
77%
540
25%
1800
27%
540
79%
540
33%
1023
September11th to 20thNight
79%
540
34%
1800
35%
540
81%
540
38%
968
September21st to endNight
75%
548
34%
1974
33%
548
80%
548
45%
900
October1st to 10thNight
66%
720
30%
2160
22%
720
72%
720
45%
1127
October11th to 20thNight
67%
720
38%
2160
24%
720
76%
720
55%
1011
October21st to endNight
64%
792
40%
2376
26%
792
73%
792
54%
1123
November1st to 10thNight
65%
740
42%
2220
26%
740
75%
740
56%
1030
November11th to 20thNight
67%
869
38%
2389
24%
869
75%
869
58%
1164
November21st to endNight
52%
950
34%
2470
18%
950
61%
950
45%
1395
December1st to 10thNight
52%
950
35%
2470
19%
950
62%
950
44%
1409
December11th to 20thNight
45%
948
29%
3099
16%
948
56%
948
35%
1732
December21st to endNight
46%
912
21%
4457
19%
903
59%
903
28%
1969

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%61%
74623
Night
5%31332445%7%62%
75054
TransparencyDay
22%8%8%16%26%20%
74350
Night
22%6%8%16%27%21%
74849
SeeingDay
5%9%23%30%25%7%
13515
Night
6%5%27%38%22%3
23883

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%5%333135%5%6%61%
1699
11th to 20thDay
6%21322335%7%66%
1620
21st to endDay
7%6%12423346%62%
1782
February1st to 10thDay
6%5%13313336%68%
1743
11th to 20thDay
8%5%12324237%63%
1749
21st to endDay
6%313322335%69%
1480
March1st to 10thDay
7%5%2442335%7%58%
1912
11th to 20thDay
6%414323335%64%
1980
21st to endDay
3313323447%66%
2245
April1st to 10thDay
321321345%7%69%
2160
11th to 20thDay
3313223235%74%
2131
21st to endDay
3212213235%75%
2160
May1st to 10thDay
2212223345%74%
2160
11th to 20thDay
22123245%5%7%66%
2125
21st to endDay
3111213345%76%
2453
June1st to 10thDay
221232346%8%68%
2520
11th to 20thDay
221222335%6%73%
2520
21st to endDay
3223435%6%7%8%55%
2410
July1st to 10thDay
5%325%6%37%9%9%9%42%
2340
11th to 20thDay
23146%47%8%11%10%42%
2340
21st to endDay
5%325%6%5%9%10%10%13%32%
2545
August1st to 10thDay
43246%47%6%9%11%43%
2159
11th to 20thDay
5%425%6%36%8%9%12%41%
2123
21st to endDay
5%3145%5%6%7%8%10%46%
2376
September1st to 10thDay
6%415%5%46%6%8%8%47%
2160
11th to 20thDay
6%3244345%6%7%57%
2160
21st to endDay
3213423346%69%
1978
October1st to 10thDay
4214423448%64%
1800
11th to 20thDay
2213222336%73%
1800
21st to endDay
2212212235%77%
1980
November1st to 10thDay
2112333246%73%
1859
11th to 20thDay
322221335%6%71%
1767
21st to endDay
6%41332345%8%61%
1710
December1st to 10thDay
8%5%12313348%63%
1710
11th to 20thDay
6%5%25%32335%8%57%
1945
21st to endDay
7%412323446%65%
3022
January1st to 10thNight
5%5%23323446%63%
2456
11th to 20thNight
8%323212445%65%
2340
21st to endNight
7%423423347%62%
2574
February1st to 10thNight
6%5%22213347%65%
2214
11th to 20thNight
10%5%12323346%61%
2098
21st to endNight
7%5%22323435%63%
1776
March1st to 10thNight
8%5%23313347%60%
2044
11th to 20thNight
8%31331345%6%62%
1980
21st to endNight
6%423313336%66%
2109
April1st to 10thNight
331332435%6%67%
1800
11th to 20thNight
7%313222445%65%
1777
21st to endNight
5%313213345%70%
1800
May1st to 10thNight
4222213336%72%
1800
11th to 20thNight
421231345%6%69%
1770
21st to endNight
2213213446%71%
1811
June1st to 10thNight
23135%36%5%7%8%58%
1440
11th to 20thNight
321231336%8%69%
1440
21st to endNight
421345%7%5%9%10%50%
1540
July1st to 10thNight
4325%5%35%6%6%12%49%
1620
11th to 20thNight
32145%37%6%8%10%50%
1620
21st to endNight
32135%48%8%10%14%42%
1773
August1st to 10thNight
42245%45%9%10%13%41%
1776
11th to 20thNight
43145%35%8%7%13%46%
1778
21st to endNight
32146%36%7%7%11%49%
1980
September1st to 10thNight
4325%5%35%6%6%10%52%
1800
11th to 20thNight
6%313435%5%6%7%57%
1800
21st to endNight
331342435%7%66%
1974
October1st to 10thNight
422442446%7%62%
2160
11th to 20thNight
3212222335%75%
2160
21st to endNight
5%21221223376%
2376
November1st to 10thNight
3211212347%73%
2220
11th to 20thNight
3212322347%72%
2389
21st to endNight
7%214324346%62%
2470
December1st to 10thNight
9%313322348%61%
2470
11th to 20thNight
6%5%2432445%7%57%
3247
21st to endNight
8%413323335%64%
4672

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
24%7%8%15%31%15%
1700
11th to 20thDay
21%5%417%34%19%
1620
21st to endDay
27%46%14%31%18%
1782
February1st to 10thDay
22%45%17%28%24%
1743
11th to 20thDay
26%5%416%27%22%
1759
21st to endDay
21%449%31%32%
1480
March1st to 10thDay
27%6%6%11%29%21%
1912
11th to 20thDay
24%5%6%11%28%26%
1980
21st to endDay
19%6%5%13%34%22%
2245
April1st to 10thDay
16%46%14%33%26%
2160
11th to 20thDay
17%4410%31%35%
2134
21st to endDay
14%5%5%13%33%30%
2160
May1st to 10thDay
15%46%9%30%36%
2160
11th to 20thDay
19%8%8%13%27%25%
2128
21st to endDay
12%45%16%28%34%
2453
June1st to 10thDay
16%6%9%19%27%23%
2520
11th to 20thDay
13%47%13%24%40%
2520
21st to endDay
24%10%12%15%20%18%
2410
July1st to 10thDay
34%14%14%15%15%8%
2276
11th to 20thDay
30%15%18%19%14%4
2271
21st to endDay
34%19%22%17%8%1
2404
August1st to 10thDay
31%15%18%24%9%3
2145
11th to 20thDay
34%16%16%18%12%4
2123
21st to endDay
31%15%16%19%17%2
2376
September1st to 10thDay
33%11%12%17%17%10%
2160
11th to 20thDay
27%8%10%19%25%11%
2160
21st to endDay
17%7%8%22%31%14%
1978
October1st to 10thDay
22%6%9%18%25%20%
1800
11th to 20thDay
17%45%12%31%31%
1800
21st to endDay
14%4419%34%25%
1980
November1st to 10thDay
16%4420%33%23%
1859
11th to 20thDay
16%5%6%19%28%25%
1767
21st to endDay
23%7%6%16%31%17%
1710
December1st to 10thDay
23%5%6%21%31%14%
1710
11th to 20thDay
28%6%8%16%29%14%
1943
21st to endDay
21%5%5%17%30%22%
3022
January1st to 10thNight
24%7%5%15%31%19%
2456
11th to 20thNight
23%5%5%11%37%18%
2340
21st to endNight
26%5%6%13%31%20%
2574
February1st to 10thNight
21%46%15%26%27%
2214
11th to 20thNight
26%45%13%29%23%
2098
21st to endNight
23%5%48%29%31%
1776
March1st to 10thNight
25%5%5%11%28%25%
2044
11th to 20thNight
23%5%6%12%31%23%
1980
21st to endNight
21%45%14%34%23%
2109
April1st to 10thNight
18%5%5%11%37%25%
1800
11th to 20thNight
21%46%12%27%30%
1777
21st to endNight
18%5%413%33%27%
1800
May1st to 10thNight
16%4411%30%35%
1800
11th to 20thNight
17%7%8%16%26%27%
1771
21st to endNight
15%5%6%16%25%34%
1812
June1st to 10thNight
23%7%10%16%20%25%
1440
11th to 20thNight
14%5%414%21%41%
1440
21st to endNight
28%10%11%16%16%19%
1540
July1st to 10thNight
29%9%15%21%18%8%
1575
11th to 20thNight
25%10%15%26%18%5%
1566
21st to endNight
26%16%22%22%12%2
1674
August1st to 10thNight
27%14%20%26%10%4
1766
11th to 20thNight
28%13%18%24%14%4
1778
21st to endNight
28%11%16%24%18%3
1980
September1st to 10thNight
29%9%13%16%20%13%
1800
11th to 20thNight
25%8%10%18%24%14%
1800
21st to endNight
19%6%9%18%33%15%
1974
October1st to 10thNight
21%7%10%15%27%20%
2160
11th to 20thNight
16%4414%27%35%
2160
21st to endNight
17%4316%32%28%
2376
November1st to 10thNight
14%5%417%35%25%
2220
11th to 20thNight
14%5%6%16%32%27%
2389
21st to endNight
24%6%5%14%31%20%
2470
December1st to 10thNight
24%6%6%17%28%20%
2470
11th to 20thNight
28%6%9%16%25%18%
3248
21st to endNight
24%5%5%14%32%20%
4672

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%13%31%30%13%2
267
11th to 20thDay
8%8%36%31%15%2
240
21st to endDay
6%13%36%27%16%2
264
February1st to 10thDay
10%9%33%28%17%3
240
11th to 20thDay
15%15%36%28%6%1
240
21st to endDay
10%27%30%26%5%2
198
March1st to 10thDay
8%21%39%25%6%1
352
11th to 20thDay
11%17%30%28%11%2
420
21st to endDay
7%28%35%23%6%1
462
April1st to 10thDay
5%20%40%26%9%1
420
11th to 20thDay
6%25%38%23%7%1
412
21st to endDay
7%23%35%26%8%1
420
May1st to 10thDay
216%38%32%11%
423
11th to 20thDay
211%34%34%17%3
448
21st to endDay
210%39%34%14%2
508
June1st to 10thDay
3417%41%32%3
630
11th to 20thDay
2318%40%32%4
630
21st to endDay
3312%38%37%8%
520
July1st to 10thDay
416%30%43%16%
446
11th to 20thDay
11323%51%22%
444
21st to endDay
35%19%47%26%
487
August1st to 10thDay
35%24%45%23%
447
11th to 20thDay
5%28%27%40%18%
437
21st to endDay
415%23%46%21%
495
September1st to 10thDay
6%112%32%39%10%
450
11th to 20thDay
7%18%37%37%11%
450
21st to endDay
2417%37%28%11%
281
October1st to 10thDay
7%5%19%31%28%10%
270
11th to 20thDay
5%8%18%33%28%8%
270
21st to endDay
411%20%31%23%9%
297
November1st to 10thDay
49%33%29%21%5%
270
11th to 20thDay
36%23%35%27%6%
270
21st to endDay
10%13%30%30%14%3
270
December1st to 10thDay
10%10%30%30%16%3
270
11th to 20thDay
6%13%33%35%12%
270
21st to endDay
11%15%35%31%9%
297
January1st to 10thNight
7%5%32%39%15%2
760
11th to 20thNight
10%432%37%15%2
720
21st to endNight
9%336%35%15%1
792
February1st to 10thNight
7%5%36%37%14%2
720
11th to 20thNight
12%6%40%34%8%
704
21st to endNight
8%9%47%31%41
592
March1st to 10thNight
8%10%38%34%9%1
720
11th to 20thNight
7%9%32%36%15%1
720
21st to endNight
7%9%40%34%10%1
723
April1st to 10thNight
37%49%32%9%
540
11th to 20thNight
7%13%38%32%9%1
533
21st to endNight
7%7%45%33%8%
540
May1st to 10thNight
46%43%38%9%
540
11th to 20thNight
3432%43%18%
531
21st to endNight
25%33%48%12%1
584
June1st to 10thNight
2322%54%18%1
540
11th to 20thNight
3220%53%21%1
540
21st to endNight
3113%50%31%2
540
July1st to 10thNight
416%45%40%3
525
11th to 20thNight
25%36%52%5%
522
21st to endNight
31433%51%8%
591
August1st to 10thNight
3426%56%10%
537
11th to 20thNight
416%31%49%9%
534
21st to endNight
226%35%48%7%
594
September1st to 10thNight
418%38%43%6%
540
11th to 20thNight
5%27%43%40%3
540
21st to endNight
3215%47%30%3
548
October1st to 10thNight
4222%45%24%3
720
11th to 20thNight
3324%44%22%3
720
21st to endNight
6%423%35%26%6%
792
November1st to 10thNight
4425%37%26%4
740
11th to 20thNight
4322%42%25%3
869
21st to endNight
8%6%29%32%21%3
950
December1st to 10thNight
9%7%28%36%18%1
950
11th to 20thNight
8%7%36%34%14%1
950
21st to endNight
11%7%31%37%12%1
922
Page generated at 2024-01-07 08:06:52. Version ac07

Copyright 2024 Attilla Danko


Alamogordo Clear Sky Chart |Charts Home