White Sands National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the White Sands National Park clear sky chart from 2005-11-06 to 2024-02-25.

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%
23970
33%
79628
26%
23884
74%
23884
48%
37573

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
65%
751
37%
3999
30%
736
76%
736
34%
1625
January11th to 20thNight
61%
753
43%
3885
31%
740
71%
740
45%
1247
January21st to endNight
60%
828
24%
4248
28%
814
74%
814
31%
2032
February1st to 10thNight
59%
760
37%
2364
26%
760
73%
760
55%
1075
February11th to 20thNight
55%
741
32%
2218
22%
740
65%
740
48%
1111
February21st to endNight
45%
610
37%
1830
21%
610
61%
610
56%
851
March1st to 10thNight
51%
720
36%
2016
20%
720
64%
720
50%
1048
March11th to 20thNight
57%
720
36%
1980
20%
720
68%
720
56%
974
March21st to endNight
52%
739
38%
2125
20%
739
68%
739
54%
1038
April1st to 10thNight
50%
540
40%
1800
27%
540
69%
540
57%
759
April11th to 20thNight
46%
533
35%
1777
23%
533
63%
533
50%
789
April21st to endNight
52%
540
41%
1800
28%
540
73%
540
58%
742
May1st to 10thNight
57%
540
35%
1800
27%
540
74%
540
59%
758
May11th to 20thNight
69%
531
30%
1770
29%
531
78%
531
54%
780
May21st to endNight
64%
582
32%
1815
26%
582
74%
582
56%
826
June1st to 10thNight
71%
540
29%
1510
25%
540
75%
540
50%
793
June11th to 20thNight
77%
540
37%
1470
29%
540
81%
540
66%
689
June21st to endNight
78%
540
22%
1620
20%
540
79%
540
43%
873
July1st to 10thNight
79%
525
22%
1575
21%
525
80%
525
38%
913
July11th to 20thNight
82%
522
23%
1566
21%
522
83%
522
40%
861
July21st to endNight
79%
591
22%
1674
22%
558
79%
558
33%
999
August1st to 10thNight
81%
537
18%
1745
22%
534
81%
534
33%
1009
August11th to 20thNight
81%
534
26%
1778
30%
534
83%
534
37%
969
August21st to endNight
79%
594
24%
1980
29%
594
80%
594
36%
1099
September1st to 10thNight
78%
540
27%
1800
31%
540
79%
540
37%
974
September11th to 20thNight
79%
540
36%
1800
40%
540
80%
540
41%
924
September21st to endNight
78%
580
35%
1992
33%
580
82%
580
52%
887
October1st to 10thNight
73%
720
32%
2160
26%
720
76%
720
48%
1094
October11th to 20thNight
73%
720
40%
2160
29%
720
80%
720
62%
954
October21st to endNight
73%
792
42%
2376
29%
792
81%
792
63%
1043
November1st to 10thNight
77%
740
43%
2220
33%
740
83%
740
67%
952
November11th to 20thNight
75%
821
42%
2341
28%
821
82%
821
66%
1043
November21st to endNight
64%
950
37%
2470
23%
950
71%
950
53%
1310
December1st to 10thNight
66%
950
39%
2474
26%
950
71%
950
55%
1295
December11th to 20thNight
61%
948
32%
3124
22%
948
69%
948
45%
1579
December21st to endNight
61%
858
24%
4366
29%
851
71%
851
39%
1658

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
431332345%7%66%
78527
Night
431332345%7%63%
80793
TransparencyDay
17%5%8%17%28%26%
78253
Night
19%5%8%16%28%25%
80589
SeeingDay
45%17%29%29%15%
13473
Night
5%321%45%25%2
24013

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
35%2342345%6%63%
2858
11th to 20thDay
2212212337%75%
2860
21st to endDay
8%5%1442346%8%56%
3146
February1st to 10thDay
3313223336%70%
1813
11th to 20thDay
6%41232433468%
1849
21st to endDay
321232243474%
1520
March1st to 10thDay
5%413423447%63%
1940
11th to 20thDay
5%412224345%68%
1980
21st to endDay
2213323447%69%
2228
April1st to 10thDay
221222335%6%73%
2160
11th to 20thDay
321232223477%
2131
21st to endDay
2212122335%79%
2160
May1st to 10thDay
2212223335%78%
2160
11th to 20thDay
221231346%8%69%
2125
21st to endDay
2111112336%79%
2456
June1st to 10thDay
221222435%8%70%
2434
11th to 20thDay
2111213346%76%
2474
21st to endDay
421343346%9%60%
2340
July1st to 10thDay
43235%45%7%9%11%47%
2340
11th to 20thDay
32235%35%6%8%13%50%
2340
21st to endDay
5%3246%46%7%10%13%41%
2545
August1st to 10thDay
42245%36%5%8%10%51%
2182
11th to 20thDay
5%3235%35%6%8%10%49%
2123
21st to endDay
4213435%6%7%11%54%
2376
September1st to 10thDay
7%3245%35%5%5%8%55%
2160
11th to 20thDay
6%2124335%47%62%
2160
21st to endDay
4212222237%72%
1964
October1st to 10thDay
421332435%7%67%
1800
11th to 20thDay
4212222235%75%
1800
21st to endDay
211221222480%
1980
November1st to 10thDay
2212222335%76%
1859
11th to 20thDay
221222335%5%73%
1815
21st to endDay
6%31332345%6%64%
1710
December1st to 10thDay
5%413223348%66%
1702
11th to 20thDay
4325%5%23447%60%
1926
21st to endDay
5%213323447%65%
3111
January1st to 10thNight
46%2443345%5%61%
4097
11th to 20thNight
4312212347%72%
4110
21st to endNight
8%5%144235%5%7%55%
4521
February1st to 10thNight
4312323346%68%
2364
11th to 20thNight
8%313323346%64%
2218
21st to endNight
431332345%7%67%
1830
March1st to 10thNight
6%6%23313347%62%
2016
11th to 20thNight
5%323223446%66%
1980
21st to endNight
4323323336%68%
2125
April1st to 10thNight
222232345%6%69%
1800
11th to 20thNight
5%313323345%68%
1777
21st to endNight
321322345%5%72%
1800
May1st to 10thNight
421222333474%
1800
11th to 20thNight
221232435%7%69%
1770
21st to endNight
2213323345%72%
1815
June1st to 10thNight
32134445%6%7%61%
1510
11th to 20thNight
311222345%7%71%
1470
21st to endNight
42135%36%6%9%10%52%
1620
July1st to 10thNight
4324436%6%6%12%49%
1620
11th to 20thNight
32246%46%7%8%12%47%
1620
21st to endNight
3325%6%47%9%8%12%41%
1773
August1st to 10thNight
5%2245%46%8%10%12%41%
1754
11th to 20thNight
5%2145%36%7%8%12%46%
1778
21st to endNight
5%325%5%446%7%11%48%
1980
September1st to 10thNight
5%3245%347%6%9%52%
1800
11th to 20thNight
7%42343445%9%56%
1800
21st to endNight
4213323446%68%
1992
October1st to 10thNight
5%31332345%8%62%
2160
11th to 20thNight
421231223476%
2160
21st to endNight
421122223477%
2376
November1st to 10thNight
2111223337%76%
2220
11th to 20thNight
2212223346%74%
2341
21st to endNight
6%323322446%64%
2470
December1st to 10thNight
7%313222448%65%
2474
11th to 20thNight
4325%43345%8%60%
3271
21st to endNight
6%313324446%65%
4581

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%8%15%41%14%
2859
11th to 20thDay
12%36%19%45%15%
2860
21st to endDay
22%6%9%24%27%12%
3146
February1st to 10thDay
16%35%18%30%28%
1813
11th to 20thDay
20%35%15%32%25%
1859
21st to endDay
15%348%32%38%
1520
March1st to 10thDay
21%36%13%30%28%
1940
11th to 20thDay
19%35%12%25%36%
1980
21st to endDay
14%36%12%33%32%
2228
April1st to 10thDay
12%3411%31%39%
2160
11th to 20thDay
12%2410%24%48%
2134
21st to endDay
10%3411%29%44%
2160
May1st to 10thDay
11%249%23%51%
2160
11th to 20thDay
13%6%8%14%22%38%
2128
21st to endDay
9%35%12%24%48%
2456
June1st to 10thDay
12%38%15%25%36%
2434
11th to 20thDay
9%35%9%23%51%
2474
21st to endDay
19%6%10%14%23%28%
2340
July1st to 10thDay
25%9%15%20%15%16%
2276
11th to 20thDay
20%11%18%22%20%10%
2271
21st to endDay
26%12%21%22%15%4
2404
August1st to 10thDay
23%10%14%27%19%7%
2167
11th to 20thDay
26%9%17%22%17%8%
2123
21st to endDay
21%9%16%23%22%8%
2376
September1st to 10thDay
25%8%11%21%21%16%
2160
11th to 20thDay
21%6%8%18%27%20%
2160
21st to endDay
14%47%19%34%23%
1964
October1st to 10thDay
18%6%8%14%27%27%
1800
11th to 20thDay
15%3410%30%38%
1800
21st to endDay
11%2319%33%31%
1980
November1st to 10thDay
11%26%19%34%28%
1859
11th to 20thDay
13%37%19%30%28%
1815
21st to endDay
20%47%15%35%20%
1710
December1st to 10thDay
19%46%23%34%14%
1702
11th to 20thDay
24%49%21%31%11%
1924
21st to endDay
16%48%20%35%18%
3111
January1st to 10thNight
20%6%7%15%38%15%
4097
11th to 20thNight
13%37%16%46%15%
4110
21st to endNight
24%6%8%19%30%12%
4521
February1st to 10thNight
17%37%16%25%31%
2364
11th to 20thNight
21%46%11%29%29%
2218
21st to endNight
16%36%9%28%38%
1830
March1st to 10thNight
22%35%12%27%31%
2016
11th to 20thNight
17%37%11%28%34%
1980
21st to endNight
17%45%9%31%33%
2125
April1st to 10thNight
14%36%9%30%38%
1800
11th to 20thNight
17%36%11%21%41%
1777
21st to endNight
12%45%12%26%42%
1800
May1st to 10thNight
15%2410%22%49%
1800
11th to 20thNight
14%6%9%11%23%38%
1771
21st to endNight
16%45%11%18%46%
1816
June1st to 10thNight
19%7%8%15%17%34%
1510
11th to 20thNight
13%36%12%17%50%
1470
21st to endNight
23%7%12%16%17%24%
1620
July1st to 10thNight
26%10%13%21%17%13%
1575
11th to 20thNight
24%9%17%20%20%10%
1566
21st to endNight
27%12%19%24%13%4
1674
August1st to 10thNight
27%11%17%26%13%6%
1745
11th to 20thNight
24%10%17%25%17%7%
1778
21st to endNight
27%9%14%23%19%7%
1980
September1st to 10thNight
27%7%13%16%21%17%
1800
11th to 20thNight
25%5%10%18%21%20%
1800
21st to endNight
17%49%16%30%24%
1992
October1st to 10thNight
19%7%9%13%24%28%
2160
11th to 20thNight
14%2411%24%44%
2160
21st to endNight
14%2415%30%36%
2376
November1st to 10thNight
11%3415%34%33%
2220
11th to 20thNight
12%35%16%31%32%
2341
21st to endNight
20%46%15%32%23%
2470
December1st to 10thNight
19%47%19%31%21%
2474
11th to 20thNight
21%5%9%20%31%14%
3272
21st to endNight
18%37%18%40%13%
4581

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
8%6%19%41%22%5%
270
11th to 20thDay
5%419%41%25%7%
270
21st to endDay
4425%34%28%6%
297
February1st to 10thDay
5%7%23%36%22%7%
270
11th to 20thDay
12%6%22%43%15%2
270
21st to endDay
5%12%27%42%10%3
210
March1st to 10thDay
5%12%32%34%14%2
380
11th to 20thDay
8%13%24%32%18%5%
420
21st to endDay
319%31%32%13%3
462
April1st to 10thDay
411%30%35%17%3
420
11th to 20thDay
317%33%30%15%2
412
21st to endDay
413%35%30%15%3
420
May1st to 10thDay
29%32%31%20%6%
423
11th to 20thDay
17%25%36%23%8%
448
21st to endDay
26%29%37%24%3
485
June1st to 10thDay
3313%33%37%10%
544
11th to 20thDay
3212%35%39%9%
584
21st to endDay
317%33%35%20%
450
July1st to 10thDay
31419%46%28%
446
11th to 20thDay
2216%38%41%
444
21st to endDay
2218%35%43%
487
August1st to 10thDay
3116%35%45%
447
11th to 20thDay
6%15%16%41%31%
437
21st to endDay
31314%38%41%
495
September1st to 10thDay
6%5%22%39%27%
450
11th to 20thDay
6%5%22%45%22%
450
21st to endDay
438%25%39%21%
298
October1st to 10thDay
6%312%26%32%21%
270
11th to 20thDay
6%310%27%34%20%
270
21st to endDay
5%5%15%24%32%19%
297
November1st to 10thDay
4418%30%32%11%
270
11th to 20thDay
1314%26%43%13%
270
21st to endDay
7%6%24%34%24%6%
270
December1st to 10thDay
9%314%39%29%7%
270
11th to 20thDay
6%6%19%44%23%3
270
21st to endDay
8%5%23%43%18%3
297
January1st to 10thNight
6%322%50%18%1
760
11th to 20thNight
6%426%46%18%1
760
21st to endNight
6%327%45%18%1
836
February1st to 10thNight
5%329%44%17%1
760
11th to 20thNight
8%429%48%10%
744
21st to endNight
45%44%41%7%
610
March1st to 10thNight
8%6%32%44%10%
720
11th to 20thNight
5%6%29%44%15%1
720
21st to endNight
4435%45%11%
739
April1st to 10thNight
15%40%44%10%
540
11th to 20thNight
5%8%36%41%9%
533
21st to endNight
37%36%44%9%
540
May1st to 10thNight
4233%50%10%
540
11th to 20thNight
3222%56%17%
531
21st to endNight
2326%55%13%1
584
June1st to 10thNight
3218%53%23%1
540
11th to 20thNight
3115%56%24%1
540
21st to endNight
319%51%34%1
540
July1st to 10thNight
5%5%42%44%4
525
11th to 20thNight
3431%56%6%
522
21st to endNight
31332%54%6%
591
August1st to 10thNight
41325%59%8%
537
11th to 20thNight
41329%55%8%
534
21st to endNight
5%432%53%5%
594
September1st to 10thNight
5%5%39%47%4
540
11th to 20thNight
7%15%43%43%1
540
21st to endNight
4110%50%31%3
580
October1st to 10thNight
4314%46%32%1
720
11th to 20thNight
4217%50%25%2
720
21st to endNight
4218%40%31%5%
792
November1st to 10thNight
3116%46%32%2
740
11th to 20thNight
3118%48%28%2
821
21st to endNight
7%322%42%24%2
950
December1st to 10thNight
8%320%47%21%1
950
11th to 20thNight
5%325%48%18%
950
21st to endNight
5%425%50%15%1
870
Page generated at 2024-02-22 04:05:45. Version ac07

Copyright 2024 Attilla Danko


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