Hueco Tanks State Park & Historic Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hueco Tanks State Park & Historic Site clear sky chart from 2005-11-05 to 2017-09-22.

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%
15408
33%
47241
22%
15367
69%
15367
46%
23827

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
49%
717
32%
2327
21%
716
63%
716
42%
1175
January16th to endNight
50%
768
34%
2496
23%
768
66%
768
40%
1257
February1st to 15thNight
53%
703
35%
2125
22%
699
68%
699
51%
1012
February16th to endNight
37%
632
38%
1894
19%
632
57%
632
49%
929
March1st to 15thNight
46%
720
37%
2007
18%
720
61%
720
47%
1039
March16th to endNight
48%
727
38%
2071
18%
727
65%
727
53%
1005
April1st to 15thNight
38%
539
36%
1798
16%
539
62%
539
45%
824
April16th to endNight
46%
540
41%
1800
23%
540
73%
540
59%
712
May1st to 15thNight
42%
539
31%
1799
19%
539
62%
539
50%
802
May16th to endNight
53%
561
31%
1841
22%
561
68%
561
52%
830
June1st to 15thNight
70%
540
28%
1620
23%
540
76%
540
53%
782
June16th to endNight
72%
540
23%
1620
21%
540
74%
540
42%
885
July1st to 15thNight
74%
510
22%
1530
20%
510
76%
510
38%
872
July16th to endNight
73%
564
22%
1608
21%
531
74%
531
33%
963
August1st to 15thNight
78%
539
19%
1789
23%
536
78%
536
28%
1085
August16th to endNight
79%
573
20%
1910
25%
573
80%
573
30%
1144
September1st to 15thNight
73%
540
24%
1800
27%
540
75%
540
31%
1050
September16th to endNight
70%
519
36%
1827
33%
519
77%
519
41%
904
October1st to 15thNight
67%
660
35%
1980
26%
660
73%
660
51%
977
October16th to endNight
69%
704
41%
2112
26%
704
78%
704
61%
927
November1st to 15thNight
61%
700
42%
2100
26%
700
73%
700
61%
936
November16th to endNight
57%
857
39%
2297
22%
857
67%
857
52%
1190
December1st to 15thNight
55%
900
38%
2346
22%
900
66%
900
53%
1249
December16th to endNight
52%
816
36%
2544
25%
816
64%
816
44%
1278

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
321332345%7%62%
47620
Night
331332345%7%61%
47441
Cloud CoverDay
321232345%7%63%
47618
Night
421332345%7%62%
47441
TransparencyDay
20%47%16%27%23%
47319
Night
21%47%15%26%24%
47244
SeeingDay
5%7%20%29%25%10%
4995
Night
45%26%37%22%3
15415

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
2312424347%62%
1611
16th to endDay
6%323323346%58%
1728
February1st to 15thDay
2313212436%67%
1734
16th to endDay
2211313235%70%
1580
March1st to 15thDay
3313223338%64%
1950
16th to endDay
3222212336%69%
2151
April1st to 15thDay
2212212336%70%
2150
16th to endDay
111221212480%
2160
May1st to 15thDay
121213346%71%
2151
16th to endDay
111112346%75%
2268
June1st to 15thDay
111212336%73%
2340
16th to endDay
2123145%6%9%61%
2340
July1st to 15thDay
4315%5%36%6%8%11%43%
2340
16th to endDay
6%315%6%47%8%7%9%38%
2449
August1st to 15thDay
42145%35%6%8%10%45%
2160
16th to endDay
4325%5%45%7%7%10%43%
2292
September1st to 15thDay
9%4244246%5%8%46%
2160
16th to endDay
5%212323447%62%
1940
October1st to 15thDay
421221235%7%65%
1650
16th to endDay
11211222477%
1760
November1st to 15thDay
2213322345%70%
1759
16th to endDay
431221234469%
1647
December1st to 15thDay
331431235%8%63%
1611
16th to endDay
5%5%24313236%61%
1689
January1st to 15thNight
35%13423245%62%
2327
16th to endNight
6%412323446%59%
2496
February1st to 15thNight
2312323347%66%
2116
16th to endNight
431322233467%
1894
March1st to 15thNight
3323313347%62%
2007
16th to endNight
221331323469%
2071
April1st to 15thNight
421321245%6%65%
1798
16th to endNight
121121222478%
1800
May1st to 15thNight
322224435%68%
1799
16th to endNight
211222335%6%68%
1840
June1st to 15thNight
11123245%48%63%
1620
16th to endNight
2113437%7%7%10%51%
1620
July1st to 15thNight
32235%46%6%7%11%45%
1620
16th to endNight
4216%7%36%6%7%12%39%
1717
August1st to 15thNight
43146%47%8%10%13%34%
1800
16th to endNight
43145%37%8%9%11%40%
1910
September1st to 15thNight
5%4245%25%7%7%9%45%
1800
16th to endNight
5%313323447%60%
1827
October1st to 15thNight
322232235%7%64%
1980
16th to endNight
221211223477%
2112
November1st to 15thNight
1212212236%74%
2100
16th to endNight
3313312235%68%
2297
December1st to 15thNight
5%32312346%65%
2346
16th to endNight
5%323312345%63%
2544

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
2313423347%62%
1611
16th to endDay
6%323313445%59%
1728
February1st to 15thDay
3312212446%67%
1734
16th to endDay
222322335%70%
1580
March1st to 15thDay
3323213337%65%
1950
16th to endDay
3213212336%70%
2149
April1st to 15thDay
2212213246%71%
2150
16th to endDay
11211121480%
2160
May1st to 15thDay
111213445%72%
2151
16th to endDay
1122336%76%
2268
June1st to 15thDay
111113346%74%
2340
16th to endDay
211231446%9%62%
2340
July1st to 15thDay
42245%36%6%7%11%45%
2340
16th to endDay
6%3246%37%7%8%9%39%
2449
August1st to 15thDay
5%314435%5%8%11%46%
2160
16th to endDay
43245%36%7%7%10%44%
2292
September1st to 15thDay
9%4134245%6%7%47%
2160
16th to endDay
4212323347%64%
1940
October1st to 15thDay
4213213346%67%
1650
16th to endDay
111111322477%
1760
November1st to 15thDay
2112213245%70%
1759
16th to endDay
43222233469%
1647
December1st to 15thDay
4213312248%64%
1611
16th to endDay
6%5%13223235%62%
1689
January1st to 15thNight
45%13323245%63%
2327
16th to endNight
7%312323446%60%
2496
February1st to 15thNight
3212223346%66%
2116
16th to endNight
431221334467%
1894
March1st to 15thNight
4312322347%63%
2007
16th to endNight
321231323469%
2071
April1st to 15thNight
3312212446%65%
1798
16th to endNight
1222223478%
1800
May1st to 15thNight
3211213345%69%
1799
16th to endNight
2112323346%69%
1840
June1st to 15thNight
1112214448%64%
1620
16th to endNight
21135%36%6%7%10%52%
1620
July1st to 15thNight
32235%46%6%6%12%46%
1620
16th to endNight
4215%6%46%6%8%12%41%
1717
August1st to 15thNight
43145%47%7%10%13%35%
1800
16th to endNight
4313445%7%10%11%42%
1910
September1st to 15thNight
6%324435%6%7%9%46%
1800
16th to endNight
431242335%6%61%
1827
October1st to 15thNight
321231335%7%64%
1980
16th to endNight
211111222477%
2112
November1st to 15thNight
112212236%74%
2100
16th to endNight
4313212235%68%
2297
December1st to 15thNight
5%212213345%66%
2346
16th to endNight
6%313312345%63%
2544

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
21%35%20%30%18%
1612
16th to endDay
26%2415%33%17%
1728
February1st to 15thDay
18%25%14%29%29%
1735
16th to endDay
17%1314%35%26%
1580
March1st to 15thDay
19%2313%35%25%
1950
16th to endDay
17%1310%32%33%
2151
April1st to 15thDay
15%2311%34%32%
2150
16th to endDay
10%127%27%49%
2160
May1st to 15thDay
13%3410%27%41%
2151
16th to endDay
11%35%12%26%40%
2271
June1st to 15thDay
12%2412%25%43%
2340
16th to endDay
17%5%8%14%25%29%
2340
July1st to 15thDay
30%8%13%19%18%10%
2201
16th to endDay
35%9%16%22%12%3
2295
August1st to 15thDay
28%10%14%25%17%4
2147
16th to endDay
32%9%15%19%18%5%
2292
September1st to 15thDay
33%6%11%19%18%11%
2160
16th to endDay
20%46%19%30%17%
1940
October1st to 15thDay
18%37%14%29%26%
1650
16th to endDay
12%2317%32%32%
1760
November1st to 15thDay
16%3419%31%24%
1759
16th to endDay
18%2216%33%25%
1647
December1st to 15thDay
20%36%23%36%10%
1611
16th to endDay
26%26%22%32%9%
1689
January1st to 15thNight
24%35%17%29%19%
2327
16th to endNight
25%3315%33%18%
2496
February1st to 15thNight
18%35%14%25%33%
2126
16th to endNight
19%3210%34%29%
1894
March1st to 15thNight
21%3313%29%28%
2007
16th to endNight
18%2410%30%33%
2071
April1st to 15thNight
18%35%8%32%30%
1798
16th to endNight
12%139%26%47%
1800
May1st to 15thNight
17%3411%26%38%
1800
16th to endNight
16%46%12%23%36%
1842
June1st to 15thNight
17%47%12%16%41%
1620
16th to endNight
24%6%11%11%19%25%
1620
July1st to 15thNight
27%6%13%24%17%9%
1530
16th to endNight
31%9%19%22%14%3
1608
August1st to 15thNight
33%10%17%21%13%3
1789
16th to endNight
31%10%15%20%14%7%
1910
September1st to 15thNight
31%8%13%18%15%12%
1800
16th to endNight
23%5%6%19%28%17%
1827
October1st to 15thNight
19%47%15%25%27%
1980
16th to endNight
13%2316%25%38%
2112
November1st to 15thNight
12%3316%35%27%
2100
16th to endNight
21%2311%32%28%
2297
December1st to 15thNight
20%26%20%31%17%
2346
16th to endNight
23%25%20%35%12%
2544

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
7%8%33%37%11%1
90
16th to endDay
5%8%42%22%12%8%
96
February1st to 15thDay
5%11%17%32%23%10%
90
16th to endDay
6%8%37%28%14%4
81
March1st to 15thDay
6%12%36%30%10%3
240
16th to endDay
6%17%28%29%14%4
288
April1st to 15thDay
7%20%29%30%11%1
269
16th to endDay
219%40%25%10%1
270
May1st to 15thDay
218%34%31%11%
288
16th to endDay
110%33%38%14%1
330
June1st to 15thDay
4217%36%29%8%
315
16th to endDay
2113%30%39%13%
315
July1st to 15thDay
48%33%36%16%
305
16th to endDay
5%324%39%26%
327
August1st to 15thDay
6%218%40%31%
315
16th to endDay
6%328%38%22%
332
September1st to 15thDay
10%27%29%36%13%
315
16th to endDay
9%112%25%42%9%
177
October1st to 15thDay
6%218%26%28%16%
90
16th to endDay
35%12%28%31%19%
96
November1st to 15thDay
7%13%20%31%17%10%
90
16th to endDay
10%17%33%23%14%1
90
December1st to 15thDay
7%5%28%35%17%4
90
16th to endDay
10%13%35%33%7%
96
January1st to 15thNight
6%6%33%33%16%3
720
16th to endNight
8%8%27%36%15%2
768
February1st to 15thNight
5%8%30%33%18%2
704
16th to endNight
5%9%45%29%9%
632
March1st to 15thNight
49%35%37%11%1
720
16th to endNight
37%36%38%12%1
727
April1st to 15thNight
5%11%42%30%9%
539
16th to endNight
29%39%35%11%
540
May1st to 15thNight
49%41%37%6%
540
16th to endNight
2434%43%13%1
563
June1st to 15thNight
1122%48%24%1
540
16th to endNight
2118%48%27%2
540
July1st to 15thNight
410%45%36%2
510
16th to endNight
47%35%46%6%
564
August1st to 15thNight
4431%48%10%
539
16th to endNight
5%5%36%45%6%
573
September1st to 15thNight
6%111%40%36%2
540
16th to endNight
6%115%44%27%3
519
October1st to 15thNight
4320%40%26%3
660
16th to endNight
3420%39%25%6%
704
November1st to 15thNight
2330%33%25%4
700
16th to endNight
5%6%26%32%24%4
857
December1st to 15thNight
6%6%28%37%18%2
900
16th to endNight
7%7%29%40%13%2
816
Page generated at 2017-09-23 05:43:41. Version ac04

Copyright 2017 A. Danko


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