Lake Mineral Wells Trailway
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Mineral Wells Trailway 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
50%
15603
31%
46984
20%
15559
60%
15559
42%
24883

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
41%
897
32%
2327
14%
895
51%
895
43%
1309
January16th to endNight
40%
960
36%
2496
14%
960
53%
960
44%
1404
February1st to 15thNight
37%
704
29%
2108
14%
699
49%
699
36%
1159
February16th to endNight
25%
632
32%
1894
9%
632
43%
632
37%
1020
March1st to 15thNight
33%
569
28%
2009
16%
569
48%
569
30%
1113
March16th to endNight
32%
576
26%
2112
16%
576
47%
576
32%
1089
April1st to 15thNight
30%
539
25%
1977
13%
539
48%
539
33%
990
April16th to endNight
33%
540
29%
1680
17%
540
51%
540
39%
912
May1st to 15thNight
36%
540
25%
1620
15%
540
52%
540
36%
933
May16th to endNight
50%
562
27%
1684
21%
561
62%
561
43%
915
June1st to 15thNight
68%
540
24%
1620
23%
540
75%
540
54%
770
June16th to endNight
75%
540
27%
1620
29%
540
78%
540
50%
808
July1st to 15thNight
75%
510
26%
1530
27%
510
80%
510
48%
793
July16th to endNight
88%
564
33%
1594
40%
531
89%
531
60%
727
August1st to 15thNight
87%
539
36%
1610
41%
536
88%
536
57%
752
August16th to endNight
80%
573
30%
1923
36%
573
82%
573
42%
971
September1st to 15thNight
72%
540
24%
1980
28%
540
74%
540
34%
1043
September16th to endNight
73%
513
34%
1891
35%
513
77%
513
40%
921
October1st to 15thNight
59%
528
37%
1848
31%
528
67%
528
44%
879
October16th to endNight
53%
704
37%
2112
21%
704
64%
704
52%
1013
November1st to 15thNight
51%
773
32%
2173
15%
773
62%
773
47%
1156
November16th to endNight
40%
900
35%
2340
15%
900
51%
900
43%
1344
December1st to 15thNight
41%
900
33%
2340
15%
900
51%
900
41%
1366
December16th to endNight
37%
960
30%
2496
12%
960
48%
960
38%
1496

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
7%313323345%62%
47890
Night
6%212212335%66%
47184
Cloud CoverDay
9%413324446%54%
47888
Night
8%313313346%59%
47184
TransparencyDay
29%410%23%23%8%
47588
Night
25%39%23%25%12%
46989
SeeingDay
8%5%19%31%26%8%
5585
Night
9%6%29%36%16%1
15607

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
9%31322112466%
1611
16th to endDay
7%21322233466%
1737
February1st to 15thDay
8%41331223465%
1750
16th to endDay
10%41221222466%
1580
March1st to 15thDay
14%41321333357%
1950
16th to endDay
7%313212235%65%
2112
April1st to 15thDay
7%313323235%63%
1971
16th to endDay
8%41221224464%
2274
May1st to 15thDay
10%32421333459%
2331
16th to endDay
8%31342345%5%56%
2430
June1st to 15thDay
42232345%6%64%
2340
16th to endDay
2212323337%66%
2340
July1st to 15thDay
421342345%7%61%
2340
16th to endDay
21332445%9%61%
2466
August1st to 15thDay
21333446%7%61%
2340
16th to endDay
6%3144345%7%8%52%
2275
September1st to 15thDay
9%3135%2335%6%55%
1980
16th to endDay
8%31432345%6%56%
1881
October1st to 15thDay
7%314312335%62%
1771
16th to endDay
6%21221212372%
1760
November1st to 15thDay
7%31231333466%
1683
16th to endDay
10%221122468%
1620
December1st to 15thDay
12%6%1421232457%
1620
16th to endDay
10%5%1332224459%
1728
January1st to 15thNight
7%31331113467%
2327
16th to endNight
7%21111122372%
2496
February1st to 15thNight
9%41221222365%
2102
16th to endNight
9%312112225%67%
1894
March1st to 15thNight
11%41331322461%
2009
16th to endNight
6%212212235%68%
2112
April1st to 15thNight
5%212313345%65%
1977
16th to endNight
8%21321223466%
1680
May1st to 15thNight
6%21331335%5%63%
1619
16th to endNight
4213222348%64%
1683
June1st to 15thNight
11221235%9%69%
1620
16th to endNight
112212337%73%
1620
July1st to 15thNight
3112222347%67%
1620
16th to endNight
21122125%8%71%
1702
August1st to 15thNight
111213348%71%
1620
16th to endNight
421332445%10%57%
1923
September1st to 15thNight
6%314223445%59%
1980
16th to endNight
5%21441335%7%60%
1891
October1st to 15thNight
7%312212236%65%
1848
16th to endNight
6%2121123473%
2112
November1st to 15thNight
42332223270%
2173
16th to endNight
10%31321223465%
2340
December1st to 15thNight
11%41321233462%
2340
16th to endNight
8%413313235%60%
2496

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
11%414322125%58%
1611
16th to endDay
11%313213335%57%
1737
February1st to 15thDay
10%414313235%58%
1750
16th to endDay
14%5%1331222458%
1580
March1st to 15thDay
15%424224435%49%
1950
16th to endDay
12%423313345%54%
2110
April1st to 15thDay
8%324324446%55%
1971
16th to endDay
10%42331435%5%54%
2274
May1st to 15thDay
11%5%25%4235%46%48%
2331
16th to endDay
9%5%15%435%5%6%6%45%
2430
June1st to 15thDay
5%3133245%5%7%57%
2340
16th to endDay
5%32332445%9%54%
2340
July1st to 15thDay
6%2246%345%6%9%49%
2340
16th to endDay
3213435%6%6%10%51%
2466
August1st to 15thDay
2213435%5%6%8%56%
2340
16th to endDay
6%314435%5%7%9%47%
2275
September1st to 15thDay
11%3145%2445%6%49%
1980
16th to endDay
8%31332445%8%53%
1881
October1st to 15thDay
8%414323346%57%
1771
16th to endDay
6%31221223370%
1760
November1st to 15thDay
7%412313445%61%
1683
16th to endDay
11%32221123463%
1620
December1st to 15thDay
11%7%2431333453%
1620
16th to endDay
12%6%24323245%51%
1728
January1st to 15thNight
10%313312235%61%
2327
16th to endNight
10%322213335%62%
2496
February1st to 15thNight
10%5%2331233459%
2102
16th to endNight
12%312213335%59%
1894
March1st to 15thNight
12%5%2332434453%
2009
16th to endNight
8%324313346%56%
2112
April1st to 15thNight
7%41342445%6%56%
1977
16th to endNight
9%32331235%6%57%
1680
May1st to 15thNight
8%42332445%6%52%
1619
16th to endNight
7%31332345%8%56%
1683
June1st to 15thNight
211231336%10%63%
1620
16th to endNight
3112224449%64%
1620
July1st to 15thNight
42133235%6%9%58%
1620
16th to endNight
211222236%11%64%
1702
August1st to 15thNight
2111223449%66%
1620
16th to endNight
431332446%11%53%
1923
September1st to 15thNight
8%32432345%7%53%
1980
16th to endNight
5%31442346%7%57%
1891
October1st to 15thNight
8%312313236%62%
1848
16th to endNight
7%2221123470%
2112
November1st to 15thNight
5%31432334366%
2173
16th to endNight
10%42321223460%
2340
December1st to 15thNight
11%423313345%56%
2340
16th to endNight
11%5%14323345%54%
2496

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
30%25%21%29%10%
1612
16th to endDay
28%25%20%30%12%
1737
February1st to 15thDay
29%35%22%26%12%
1751
16th to endDay
31%25%18%26%15%
1580
March1st to 15thDay
37%37%17%23%11%
1950
16th to endDay
32%39%23%21%9%
2112
April1st to 15thDay
30%310%23%18%13%
1971
16th to endDay
30%39%21%24%9%
2274
May1st to 15thDay
36%49%19%21%8%
2331
16th to endDay
35%5%14%21%20%2
2434
June1st to 15thDay
24%5%14%27%24%3
2340
16th to endDay
27%5%12%27%21%5%
2340
July1st to 15thDay
28%5%17%28%17%1
2201
16th to endDay
22%6%16%32%21%1
2311
August1st to 15thDay
22%5%14%29%24%3
2326
16th to endDay
29%6%14%30%15%3
2275
September1st to 15thDay
33%39%23%21%7%
1980
16th to endDay
27%5%7%23%24%11%
1881
October1st to 15thDay
27%39%23%21%14%
1771
16th to endDay
20%25%21%31%18%
1760
November1st to 15thDay
25%38%23%26%12%
1683
16th to endDay
26%15%19%29%17%
1620
December1st to 15thDay
34%25%22%26%8%
1620
16th to endDay
35%25%22%25%8%
1728
January1st to 15thNight
27%16%18%30%15%
2327
16th to endNight
26%25%19%30%16%
2496
February1st to 15thNight
29%26%17%25%18%
2112
16th to endNight
28%26%20%25%16%
1894
March1st to 15thNight
33%37%17%22%14%
2009
16th to endNight
27%5%11%22%25%7%
2112
April1st to 15thNight
27%310%21%19%16%
1977
16th to endNight
27%410%20%26%11%
1680
May1st to 15thNight
30%410%20%22%10%
1620
16th to endNight
25%416%24%24%3
1685
June1st to 15thNight
15%5%14%33%23%7%
1620
16th to endNight
18%5%12%29%26%7%
1620
July1st to 15thNight
21%5%11%35%21%5%
1530
16th to endNight
14%318%34%25%3
1594
August1st to 15thNight
14%5%11%31%30%6%
1610
16th to endNight
23%5%12%31%21%5%
1923
September1st to 15thNight
28%5%10%22%23%9%
1980
16th to endNight
25%37%24%25%13%
1891
October1st to 15thNight
23%210%23%22%17%
1848
16th to endNight
19%25%17%32%22%
2112
November1st to 15thNight
23%36%24%24%17%
2173
16th to endNight
27%2416%31%17%
2340
December1st to 15thNight
29%26%22%26%11%
2340
16th to endNight
33%16%21%24%11%
2496

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
18%12%32%25%10%1
90
16th to endDay
8%10%43%25%11%1
96
February1st to 15thDay
8%10%36%36%7%
90
16th to endDay
13%8%45%23%8%
81
March1st to 15thDay
21%16%25%30%6%
90
16th to endDay
8%12%31%38%7%2
96
April1st to 15thDay
11%16%30%25%16%
90
16th to endDay
12%12%41%21%11%
384
May1st to 15thDay
13%9%37%28%8%2
468
16th to endDay
15%5%30%30%14%2
517
June1st to 15thDay
6%114%43%27%6%
495
16th to endDay
4212%37%32%10%
495
July1st to 15thDay
5%27%37%38%8%
475
16th to endDay
2328%46%19%
515
August1st to 15thDay
31329%47%14%
493
16th to endDay
10%5%33%34%14%
315
September1st to 15thDay
221%49%25%
135
16th to endDay
7%22%45%23%
108
October1st to 15thDay
11%47%30%11%
90
16th to endDay
13%5%14%37%25%4
96
November1st to 15thDay
12%6%27%35%13%4
90
16th to endDay
24%15%28%18%8%3
90
December1st to 15thDay
20%5%27%32%11%3
90
16th to endDay
10%16%40%25%7%
96
January1st to 15thNight
11%9%33%36%9%
900
16th to endNight
12%9%34%34%8%
960
February1st to 15thNight
13%10%35%35%4
704
16th to endNight
15%11%46%24%2
632
March1st to 15thNight
13%9%41%30%5%
569
16th to endNight
9%10%45%29%5%
576
April1st to 15thNight
8%11%46%28%4
539
16th to endNight
9%8%45%28%7%
540
May1st to 15thNight
11%5%42%31%7%1
540
16th to endNight
7%332%38%17%1
563
June1st to 15thNight
3121%49%21%1
540
16th to endNight
2214%50%27%2
540
July1st to 15thNight
5%11%46%32%3
510
16th to endNight
3347%41%3
564
August1st to 15thNight
2342%47%4
539
16th to endNight
5%444%38%5%
573
September1st to 15thNight
9%17%39%39%3
540
16th to endNight
6%11%44%33%3
513
October1st to 15thNight
10%222%38%23%2
528
16th to endNight
9%5%30%35%18%
704
November1st to 15thNight
7%5%32%36%17%1
773
16th to endNight
14%7%35%31%10%
900
December1st to 15thNight
14%8%33%36%7%
900
16th to endNight
15%8%36%31%8%
960
Page generated at 2017-09-23 05:43:36. Version ac04

Copyright 2017 A. Danko


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