Alamogordo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Alamogordo clear sky chart from 2005-11-05 to 2018-03-11.

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
56%
16234
31%
49179
20%
16192
67%
16192
41%
25733

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 15thNight
50%
778
30%
2522
21%
776
63%
776
38%
1296
January16th to endNight
48%
832
33%
2704
23%
832
63%
832
37%
1397
February1st to 15thNight
48%
762
34%
2329
20%
759
62%
759
45%
1148
February16th to endNight
32%
684
34%
2050
14%
684
52%
684
36%
1089
March1st to 15thNight
44%
764
33%
2147
15%
764
58%
764
40%
1160
March16th to endNight
46%
722
36%
2066
17%
722
62%
722
47%
1024
April1st to 15thNight
35%
539
33%
1798
14%
539
58%
539
34%
895
April16th to endNight
37%
540
38%
1800
19%
540
63%
540
44%
798
May1st to 15thNight
44%
540
29%
1799
20%
539
62%
539
46%
817
May16th to endNight
50%
561
31%
1784
18%
561
67%
561
47%
847
June1st to 15thNight
64%
540
30%
1440
21%
540
70%
540
52%
765
June16th to endNight
74%
540
23%
1507
19%
540
76%
540
40%
860
July1st to 15thNight
77%
510
22%
1530
20%
510
78%
510
38%
868
July16th to endNight
79%
564
20%
1593
19%
531
79%
531
31%
961
August1st to 15thNight
83%
539
19%
1782
21%
536
83%
536
29%
1063
August16th to endNight
79%
573
23%
1910
27%
573
80%
573
30%
1128
September1st to 15thNight
74%
540
22%
1800
23%
540
76%
540
29%
1070
September16th to endNight
71%
543
34%
1918
32%
543
77%
543
41%
933
October1st to 15thNight
60%
720
33%
2160
21%
720
68%
720
50%
1045
October16th to endNight
67%
768
40%
2304
27%
768
76%
768
55%
1067
November1st to 15thNight
60%
770
39%
2290
23%
770
71%
770
54%
1074
November16th to endNight
58%
975
37%
2535
22%
975
67%
975
47%
1375
December1st to 15thNight
49%
975
33%
2584
17%
975
59%
975
41%
1468
December16th to endNight
42%
955
31%
2827
18%
955
54%
955
36%
1585

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
421332445%7%61%
49421
Night
421232345%7%62%
49378
Cloud CoverDay
321332345%7%61%
49419
Night
4212323447%63%
49378
TransparencyDay
23%7%8%16%26%18%
49118
Night
22%6%7%16%27%19%
49183
SeeingDay
6%13%25%30%19%5%
5799
Night
6%8%25%32%22%4
16240

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 15thDay
432321345%6%63%
1746
16th to endDay
7%312312346%63%
1872
February1st to 15thDay
5%312312236%68%
1858
16th to endDay
7%312222236%66%
1710
March1st to 15thDay
4313323346%61%
2046
16th to endDay
3312213335%69%
2157
April1st to 15thDay
3213212346%66%
2150
16th to endDay
21222135%77%
2160
May1st to 15thDay
1212223446%68%
2151
16th to endDay
2111213345%72%
2324
June1st to 15thDay
12221235%6%70%
2520
16th to endDay
11223246%6%8%59%
2446
July1st to 15thDay
42146%37%8%10%10%39%
2340
16th to endDay
43246%48%9%11%11%32%
2467
August1st to 15thDay
43245%36%6%9%12%39%
2166
16th to endDay
4315%5%46%6%8%9%44%
2292
September1st to 15thDay
6%415%5%45%6%8%7%44%
2160
16th to endDay
3212323347%64%
2037
October1st to 15thDay
3213312238%67%
1800
16th to endDay
112212225%76%
1920
November1st to 15thDay
2112213236%72%
1883
16th to endDay
4312212336%67%
1755
December1st to 15thDay
6%412212248%63%
1703
16th to endDay
6%5%22312349%58%
1758
January1st to 15thNight
5%312223445%64%
2522
16th to endNight
7%312312335%64%
2704
February1st to 15thNight
4322212246%66%
2321
16th to endNight
9%322213335%63%
2050
March1st to 15thNight
6%313312346%63%
2147
16th to endNight
5%312212235%70%
2066
April1st to 15thNight
421322335%5%64%
1798
16th to endNight
421221233472%
1800
May1st to 15thNight
2212213345%70%
1799
16th to endNight
2111213447%69%
1783
June1st to 15thNight
112325%46%8%63%
1440
16th to endNight
1112346%48%10%55%
1507
July1st to 15thNight
23144245%6%11%51%
1620
16th to endNight
21135%37%6%9%12%46%
1701
August1st to 15thNight
3114435%9%10%12%43%
1792
16th to endNight
21146%36%7%7%12%47%
1910
September1st to 15thNight
43245%35%5%6%9%48%
1800
16th to endNight
422324347%63%
1918
October1st to 15thNight
3112212346%67%
2160
16th to endNight
31221223475%
2304
November1st to 15thNight
2111212237%72%
2290
16th to endNight
6%213313235%67%
2535
December1st to 15thNight
8%412212346%62%
2584
16th to endNight
7%413323345%59%
2827

Percentage Cloud Cover SE (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 15thDay
431321345%6%63%
1746
16th to endDay
6%312312346%63%
1872
February1st to 15thDay
4313212235%69%
1858
16th to endDay
6%212222235%66%
1710
March1st to 15thDay
4313323346%62%
2046
16th to endDay
2312223236%69%
2155
April1st to 15thDay
3212212346%67%
2150
16th to endDay
211211235%77%
2160
May1st to 15thDay
1212213446%68%
2151
16th to endDay
2111113346%72%
2324
June1st to 15thDay
11121335%6%71%
2520
16th to endDay
1212325%5%6%9%59%
2446
July1st to 15thDay
34145%36%8%10%11%40%
2340
16th to endDay
4315%5%49%10%11%10%33%
2467
August1st to 15thDay
43245%36%7%9%11%40%
2166
16th to endDay
33145%45%6%8%9%45%
2292
September1st to 15thDay
7%4145%45%6%7%7%45%
2160
16th to endDay
3213223446%64%
2037
October1st to 15thDay
3212322248%68%
1800
16th to endDay
111221222477%
1920
November1st to 15thDay
212113335%73%
1883
16th to endDay
4312212345%68%
1755
December1st to 15thDay
6%412212247%65%
1703
16th to endDay
6%413322348%58%
1758
January1st to 15thNight
4312313445%64%
2522
16th to endNight
7%313212335%64%
2704
February1st to 15thNight
4312212237%66%
2321
16th to endNight
8%312213345%62%
2050
March1st to 15thNight
6%313212336%63%
2147
16th to endNight
5%211212325%70%
2066
April1st to 15thNight
4213213445%65%
1798
16th to endNight
4212212335%71%
1800
May1st to 15thNight
2212213346%69%
1799
16th to endNight
2111212437%70%
1783
June1st to 15thNight
1123245%6%8%63%
1440
16th to endNight
112237%48%10%56%
1507
July1st to 15thNight
22244345%6%10%52%
1620
16th to endNight
21135%35%7%9%12%46%
1701
August1st to 15thNight
3214435%8%10%12%43%
1792
16th to endNight
21145%36%6%7%12%47%
1910
September1st to 15thNight
4314436%6%6%8%49%
1800
16th to endNight
431132345%6%62%
1918
October1st to 15thNight
3112213346%68%
2160
16th to endNight
311212325%75%
2304
November1st to 15thNight
211211337%72%
2290
16th to endNight
5%212323225%67%
2535
December1st to 15thNight
8%312212246%62%
2584
16th to endNight
7%312424346%59%
2827

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 15thDay
23%5%6%17%30%16%
1747
16th to endDay
25%45%15%33%15%
1872
February1st to 15thDay
21%4417%30%21%
1859
16th to endDay
23%4313%33%22%
1710
March1st to 15thDay
25%45%13%30%20%
2046
16th to endDay
19%45%11%35%23%
2157
April1st to 15thDay
20%4413%33%24%
2150
16th to endDay
12%3410%32%35%
2160
May1st to 15thDay
17%6%8%10%29%27%
2151
16th to endDay
15%5%5%14%29%30%
2327
June1st to 15thDay
14%5%7%15%24%33%
2520
16th to endDay
22%8%10%15%20%23%
2446
July1st to 15thDay
35%13%14%15%13%7%
2201
16th to endDay
37%15%19%18%9%
2312
August1st to 15thDay
35%15%17%20%8%2
2152
16th to endDay
34%14%14%18%15%3
2292
September1st to 15thDay
35%11%11%18%17%5%
2160
16th to endDay
21%7%8%21%27%13%
2037
October1st to 15thDay
20%47%18%29%19%
1800
16th to endDay
14%4418%32%25%
1920
November1st to 15thDay
16%45%20%32%20%
1883
16th to endDay
19%5%416%32%21%
1755
December1st to 15thDay
22%48%20%33%10%
1703
16th to endDay
27%5%7%20%28%10%
1758
January1st to 15thNight
24%5%5%14%32%16%
2522
16th to endNight
25%4413%33%17%
2704
February1st to 15thNight
21%36%14%28%24%
2331
16th to endNight
25%4311%34%21%
2050
March1st to 15thNight
22%5%412%31%23%
2147
16th to endNight
19%3412%36%23%
2066
April1st to 15thNight
22%5%411%35%20%
1798
16th to endNight
16%3411%32%31%
1800
May1st to 15thNight
16%5%5%13%31%27%
1800
16th to endNight
17%5%6%15%27%27%
1785
June1st to 15thNight
19%5%7%13%20%34%
1440
16th to endNight
24%8%11%15%17%22%
1507
July1st to 15thNight
26%8%14%24%18%7%
1530
16th to endNight
27%13%20%24%12%1
1593
August1st to 15thNight
28%13%18%24%11%2
1782
16th to endNight
28%12%14%23%17%3
1910
September1st to 15thNight
31%10%15%17%16%8%
1800
16th to endNight
22%6%8%19%29%13%
1918
October1st to 15thNight
18%47%16%29%22%
2160
16th to endNight
15%3317%28%31%
2304
November1st to 15thNight
15%4418%35%21%
2290
16th to endNight
21%3412%31%25%
2535
December1st to 15thNight
25%5%6%17%29%16%
2584
16th to endNight
28%5%7%19%28%11%
2827

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 15thDay
14%14%33%24%10%2
135
16th to endDay
6%25%23%19%21%4
144
February1st to 15thDay
8%10%34%28%16%1
135
16th to endDay
14%35%22%17%8%2
120
March1st to 15thDay
7%20%42%22%41
263
16th to endDay
5%28%35%21%6%2
288
April1st to 15thDay
8%33%37%16%11
269
16th to endDay
9%32%35%18%31
270
May1st to 15thDay
328%40%22%3
288
16th to endDay
216%44%27%7%
348
June1st to 15thDay
3424%38%23%5%
495
16th to endDay
2117%37%35%4
421
July1st to 15thDay
7%12%40%30%7%
305
16th to endDay
5%18%27%43%13%
327
August1st to 15thDay
3111%31%38%13%
315
16th to endDay
6%29%35%34%11%
332
September1st to 15thDay
10%113%43%24%6%
315
16th to endDay
6%330%44%12%2
201
October1st to 15thDay
10%5%22%32%20%8%
135
16th to endDay
36%26%28%22%12%
144
November1st to 15thDay
5%19%31%28%11%4
135
16th to endDay
10%19%22%31%14%2
135
December1st to 15thDay
10%17%23%31%14%2
135
16th to endDay
14%23%29%22%9%
144
January1st to 15thNight
7%10%28%32%17%4
780
16th to endNight
10%10%28%30%16%2
832
February1st to 15thNight
7%11%31%31%15%2
764
16th to endNight
10%19%36%26%6%
684
March1st to 15thNight
7%16%29%31%13%1
764
16th to endNight
5%14%31%34%12%
722
April1st to 15thNight
5%20%35%29%7%
539
16th to endNight
7%16%37%28%9%
540
May1st to 15thNight
412%37%36%9%
540
16th to endNight
28%34%39%12%1
563
June1st to 15thNight
1227%44%21%2
540
16th to endNight
2117%47%27%3
540
July1st to 15thNight
319%42%37%4
510
16th to endNight
318%29%46%11%
564
August1st to 15thNight
45%25%47%16%
539
16th to endNight
29%29%46%11%
573
September1st to 15thNight
6%10%32%40%8%
540
16th to endNight
5%217%37%32%4
543
October1st to 15thNight
35%28%33%25%4
720
16th to endNight
35%20%32%29%8%
768
November1st to 15thNight
47%25%31%25%5%
770
16th to endNight
8%10%19%32%23%5%
975
December1st to 15thNight
11%11%25%32%17%1
975
16th to endNight
12%10%31%29%14%1
955
Page generated at 2018-03-12 11:28:08. Version ac04

Copyright 2018 A. Danko


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