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 2019-06-10.

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
57%
17689
33%
54209
23%
17648
69%
17648
45%
27425

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%
837
32%
2717
22%
836
63%
836
41%
1388
January16th to endNight
52%
896
34%
2912
23%
896
67%
896
42%
1433
February1st to 15thNight
51%
823
36%
2487
22%
819
66%
819
49%
1210
February16th to endNight
38%
736
36%
2206
18%
736
57%
736
48%
1095
March1st to 15thNight
44%
840
36%
2342
17%
840
59%
840
45%
1239
March16th to endNight
47%
849
37%
2417
17%
849
63%
849
51%
1193
April1st to 15thNight
39%
629
39%
2098
18%
629
64%
629
46%
947
April16th to endNight
45%
624
39%
2079
22%
624
71%
624
56%
845
May1st to 15thNight
44%
629
33%
2099
22%
629
64%
629
49%
942
May16th to endNight
51%
657
31%
2157
21%
657
67%
657
53%
964
June1st to 15thNight
69%
612
29%
1836
24%
612
75%
612
52%
898
June16th to endNight
73%
585
23%
1755
21%
585
76%
585
43%
951
July1st to 15thNight
74%
555
21%
1665
19%
555
76%
555
37%
963
July16th to endNight
72%
612
22%
1753
21%
579
73%
579
33%
1040
August1st to 15thNight
78%
575
21%
1908
25%
572
78%
572
29%
1137
August16th to endNight
79%
621
20%
2070
24%
621
80%
621
30%
1241
September1st to 15thNight
73%
585
27%
1950
29%
585
75%
585
32%
1124
September16th to endNight
69%
590
34%
2077
32%
590
76%
590
41%
1033
October1st to 15thNight
65%
780
34%
2340
25%
780
71%
780
49%
1175
October16th to endNight
66%
832
39%
2496
25%
832
75%
832
56%
1140
November1st to 15thNight
62%
820
42%
2460
26%
820
74%
820
61%
1097
November16th to endNight
58%
1000
39%
2680
22%
1000
68%
1000
54%
1364
December1st to 15thNight
53%
1050
38%
2737
21%
1050
64%
1050
49%
1508
December16th to endNight
51%
952
35%
2968
25%
952
63%
952
43%
1498

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%
54280
Night
331332345%7%61%
54409
Cloud CoverDay
321332345%7%63%
54278
Night
421332345%7%61%
54409
TransparencyDay
20%47%16%27%23%
53979
Night
21%47%15%26%24%
54212
SeeingDay
6%7%21%30%24%10%
7146
Night
5%5%26%37%21%3
17696

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
3312424448%60%
1881
16th to endDay
5%423323445%60%
2016
February1st to 15thDay
3313212436%65%
2032
16th to endDay
322313335%68%
1840
March1st to 15thDay
3413324337%61%
2274
16th to endDay
3223212336%66%
2509
April1st to 15thDay
2212212346%70%
2510
16th to endDay
111121212478%
2486
May1st to 15thDay
121213346%71%
2511
16th to endDay
111112346%76%
2656
June1st to 15thDay
111213436%72%
2653
16th to endDay
2123145%6%8%62%
2535
July1st to 15thDay
4315%6%36%6%8%11%42%
2535
16th to endDay
5%315%6%47%8%7%10%40%
2656
August1st to 15thDay
42145%35%6%8%10%47%
2294
16th to endDay
33245%46%7%8%10%43%
2484
September1st to 15thDay
9%4244246%5%8%47%
2340
16th to endDay
5%212323447%63%
2208
October1st to 15thDay
5%21321235%7%64%
1950
16th to endDay
22221222474%
2080
November1st to 15thDay
1113322245%71%
2059
16th to endDay
3212212345%68%
1921
December1st to 15thDay
4315%31235%7%60%
1879
16th to endDay
6%5%23323246%60%
1971
January1st to 15thNight
35%14423345%60%
2717
16th to endNight
5%31232345%6%61%
2912
February1st to 15thNight
3313313347%64%
2478
16th to endNight
4313223345%65%
2206
March1st to 15thNight
3424313347%60%
2342
16th to endNight
2313323245%66%
2417
April1st to 15thNight
3213212446%66%
2098
16th to endNight
121121233475%
2079
May1st to 15thNight
332223335%68%
2099
16th to endNight
2112213346%69%
2156
June1st to 15thNight
12133245%48%63%
1836
16th to endNight
2113436%6%6%9%53%
1755
July1st to 15thNight
42235%36%7%7%11%44%
1755
16th to endNight
4216%7%36%6%7%12%40%
1862
August1st to 15thNight
43146%46%8%10%13%35%
1919
16th to endNight
43145%37%8%10%12%39%
2070
September1st to 15thNight
5%4145%25%7%7%9%46%
1950
16th to endNight
4313323447%60%
2077
October1st to 15thNight
422232335%7%62%
2340
16th to endNight
321221223473%
2496
November1st to 15thNight
1112212346%73%
2460
16th to endNight
3313312235%68%
2680
December1st to 15thNight
5%313322346%62%
2737
16th to endNight
5%324312345%62%
2968

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
2313424448%60%
1881
16th to endDay
6%323313445%61%
2016
February1st to 15thDay
3312212446%65%
2032
16th to endDay
322212345%68%
1840
March1st to 15thDay
3323323337%62%
2274
16th to endDay
3213212336%67%
2507
April1st to 15thDay
221221325%6%70%
2510
16th to endDay
21121122478%
2486
May1st to 15thDay
111213345%72%
2511
16th to endDay
1112336%77%
2656
June1st to 15thDay
111213347%72%
2653
16th to endDay
211231445%8%64%
2535
July1st to 15thDay
42245%36%6%7%11%44%
2535
16th to endDay
5%3246%36%7%8%9%41%
2656
August1st to 15thDay
4214335%5%8%10%47%
2294
16th to endDay
33245%36%7%8%10%44%
2484
September1st to 15thDay
9%4134245%7%7%48%
2340
16th to endDay
422323346%64%
2208
October1st to 15thDay
5%213313346%65%
1950
16th to endDay
211221322475%
2080
November1st to 15thDay
2112212245%71%
2059
16th to endDay
422222345%68%
1921
December1st to 15thDay
5%314312347%60%
1879
16th to endDay
6%5%14223236%61%
1971
January1st to 15thNight
45%13423245%61%
2717
16th to endNight
6%312323346%62%
2912
February1st to 15thNight
4212223347%65%
2478
16th to endNight
4313213345%66%
2206
March1st to 15thNight
4413322347%61%
2342
16th to endNight
3223313335%66%
2417
April1st to 15thNight
3312312447%66%
2098
16th to endNight
1212212235%75%
2079
May1st to 15thNight
3212213345%68%
2099
16th to endNight
212213346%70%
2156
June1st to 15thNight
1113224448%64%
1836
16th to endNight
21125%35%5%6%10%54%
1755
July1st to 15thNight
42235%36%7%6%11%45%
1755
16th to endNight
4216%6%46%6%8%11%42%
1862
August1st to 15thNight
43145%47%6%10%13%37%
1919
16th to endNight
3313446%8%10%11%40%
2070
September1st to 15thNight
5%3244346%7%9%48%
1950
16th to endNight
431242335%6%61%
2077
October1st to 15thNight
431232335%7%63%
2340
16th to endNight
321221232474%
2496
November1st to 15thNight
112212346%73%
2460
16th to endNight
4213212236%68%
2680
December1st to 15thNight
6%313223345%63%
2737
16th to endNight
6%313322345%62%
2968

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%17%
1882
16th to endDay
24%2414%34%18%
2016
February1st to 15thDay
20%26%15%27%27%
2033
16th to endDay
18%2314%33%27%
1840
March1st to 15thDay
22%2313%32%24%
2274
16th to endDay
19%2411%32%30%
2509
April1st to 15thDay
15%2311%34%32%
2510
16th to endDay
11%138%28%45%
2486
May1st to 15thDay
14%2410%28%39%
2511
16th to endDay
10%25%12%27%41%
2659
June1st to 15thDay
13%2412%26%40%
2653
16th to endDay
16%5%7%13%25%31%
2535
July1st to 15thDay
31%8%13%18%17%9%
2396
16th to endDay
33%9%16%23%13%3
2502
August1st to 15thDay
27%9%13%27%18%4
2281
16th to endDay
31%9%15%20%17%5%
2484
September1st to 15thDay
32%6%11%19%18%11%
2340
16th to endDay
20%46%20%31%16%
2208
October1st to 15thDay
19%37%14%30%23%
1950
16th to endDay
14%2418%30%29%
2080
November1st to 15thDay
15%25%23%32%21%
2059
16th to endDay
18%3316%34%23%
1921
December1st to 15thDay
23%36%22%33%10%
1879
16th to endDay
26%25%22%31%10%
1971
January1st to 15thNight
25%35%17%29%18%
2717
16th to endNight
23%2415%34%19%
2912
February1st to 15thNight
19%35%14%24%32%
2488
16th to endNight
20%3310%32%29%
2206
March1st to 15thNight
23%3313%28%27%
2342
16th to endNight
19%2410%30%31%
2417
April1st to 15thNight
18%35%9%33%29%
2098
16th to endNight
12%2311%25%44%
2079
May1st to 15thNight
17%3411%25%37%
2100
16th to endNight
15%45%11%24%37%
2158
June1st to 15thNight
18%47%13%17%38%
1836
16th to endNight
24%6%10%11%19%28%
1755
July1st to 15thNight
28%7%13%24%16%9%
1665
16th to endNight
30%8%18%22%15%4
1753
August1st to 15thNight
31%10%16%22%14%3
1908
16th to endNight
30%10%15%20%14%7%
2070
September1st to 15thNight
30%8%13%18%16%12%
1950
16th to endNight
23%5%6%19%28%17%
2077
October1st to 15thNight
20%47%16%25%25%
2340
16th to endNight
16%2415%25%35%
2496
November1st to 15thNight
12%4418%35%24%
2460
16th to endNight
19%2312%34%27%
2680
December1st to 15thNight
23%25%20%30%16%
2737
16th to endNight
24%25%19%34%13%
2968

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%9%31%32%17%1
180
16th to endDay
6%6%34%28%17%6%
192
February1st to 15thDay
8%10%26%30%16%7%
180
16th to endDay
9%14%37%27%9%2
159
March1st to 15thDay
9%12%38%30%7%2
354
16th to endDay
6%17%29%29%13%3
416
April1st to 15thDay
6%18%28%32%12%1
389
16th to endDay
316%39%27%10%1
378
May1st to 15thDay
314%32%31%15%1
408
16th to endDay
210%34%37%14%
458
June1st to 15thDay
5%117%39%28%7%
412
16th to endDay
2113%29%38%14%
375
July1st to 15thDay
6%8%30%36%17%
365
16th to endDay
5%323%39%27%
391
August1st to 15thDay
6%318%42%29%
359
16th to endDay
6%326%38%25%
396
September1st to 15thDay
9%27%28%37%14%
375
16th to endDay
9%113%24%37%12%
255
October1st to 15thDay
8%218%31%25%13%
180
16th to endDay
5%7%16%26%26%18%
192
November1st to 15thDay
5%10%23%35%16%9%
180
16th to endDay
5%12%27%30%20%3
180
December1st to 15thDay
8%8%24%37%17%2
180
16th to endDay
10%9%32%35%9%1
192
January1st to 15thNight
6%5%32%35%16%3
840
16th to endNight
7%9%26%37%16%3
896
February1st to 15thNight
5%8%31%33%17%2
824
16th to endNight
5%9%44%30%8%
736
March1st to 15thNight
5%9%36%36%10%1
840
16th to endNight
37%37%37%11%1
849
April1st to 15thNight
5%11%41%31%10%
629
16th to endNight
49%38%36%10%
624
May1st to 15thNight
49%39%37%8%
630
16th to endNight
2435%41%13%1
659
June1st to 15thNight
1122%49%23%1
612
16th to endNight
2118%49%26%2
585
July1st to 15thNight
410%45%36%2
555
16th to endNight
47%36%46%6%
612
August1st to 15thNight
4432%48%9%
575
16th to endNight
5%5%35%46%7%
621
September1st to 15thNight
6%111%41%36%2
585
16th to endNight
6%117%43%27%3
590
October1st to 15thNight
6%321%39%26%3
780
16th to endNight
4421%37%25%6%
832
November1st to 15thNight
2329%36%24%4
820
16th to endNight
46%26%34%24%4
1000
December1st to 15thNight
7%6%27%38%17%2
1050
16th to endNight
7%6%28%39%14%1
952
Page generated at 2019-06-10 18:29:45. Version ac04

Copyright 2019 A. Danko


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