Lake Mineral Wells State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Mineral Wells State Park clear sky chart from 2005-11-05 to 2017-09-18.

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
51%
15588
30%
46941
21%
15543
61%
15543
42%
24999

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
42%
897
32%
2327
14%
895
51%
895
43%
1319
January16th to endNight
42%
957
35%
2493
15%
957
54%
957
45%
1394
February1st to 15thNight
38%
704
29%
2107
14%
698
50%
698
37%
1157
February16th to endNight
27%
632
32%
1894
10%
632
44%
632
38%
1024
March1st to 15thNight
34%
570
28%
2010
16%
570
48%
570
29%
1120
March16th to endNight
33%
576
26%
2112
17%
576
47%
576
32%
1091
April1st to 15thNight
31%
539
25%
1977
13%
539
48%
539
33%
1002
April16th to endNight
34%
540
29%
1679
17%
540
53%
540
39%
905
May1st to 15thNight
36%
540
25%
1620
15%
540
52%
540
35%
942
May16th to endNight
51%
562
28%
1684
22%
561
63%
561
41%
933
June1st to 15thNight
68%
540
24%
1620
22%
540
75%
540
53%
783
June16th to endNight
74%
540
27%
1620
29%
540
78%
540
48%
823
July1st to 15thNight
76%
510
25%
1530
26%
510
80%
510
47%
799
July16th to endNight
86%
564
33%
1594
40%
531
88%
531
59%
738
August1st to 15thNight
88%
539
36%
1610
41%
536
89%
536
57%
746
August16th to endNight
80%
573
30%
1928
36%
573
82%
573
40%
990
September1st to 15thNight
72%
540
23%
1980
28%
540
74%
540
34%
1050
September16th to endNight
74%
501
33%
1848
35%
501
77%
501
39%
907
October1st to 15thNight
61%
525
36%
1845
31%
525
69%
525
44%
878
October16th to endNight
54%
704
37%
2112
21%
704
64%
704
51%
1023
November1st to 15thNight
52%
775
32%
2175
16%
775
62%
775
47%
1160
November16th to endNight
41%
900
34%
2340
16%
900
52%
900
43%
1341
December1st to 15thNight
42%
900
33%
2340
15%
900
52%
900
40%
1375
December16th to endNight
37%
960
30%
2496
12%
960
48%
960
38%
1499

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
8%41332445%6%54%
47843
Night
7%313323347%59%
47142
Cloud CoverDay
9%413324446%54%
47841
Night
7%313313346%59%
47142
TransparencyDay
29%5%10%22%23%9%
47541
Night
25%49%22%25%12%
46947
SeeingDay
8%419%31%26%8%
5570
Night
9%5%29%37%16%1
15592

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
11%423323225%59%
1611
16th to endDay
11%413223445%57%
1740
February1st to 15thDay
11%413313335%58%
1750
16th to endDay
13%6%1321222459%
1580
March1st to 15thDay
14%5%13324445%49%
1948
16th to endDay
12%423313346%53%
2112
April1st to 15thDay
8%324424446%55%
1971
16th to endDay
9%5%2332335%6%54%
2276
May1st to 15thDay
12%5%35%32335%6%48%
2331
16th to endDay
9%5%245%35%5%5%7%45%
2430
June1st to 15thDay
4313325%46%7%57%
2340
16th to endDay
5%32341445%9%54%
2340
July1st to 15thDay
6%3145%35%5%5%9%49%
2340
16th to endDay
3113436%5%7%10%51%
2466
August1st to 15thDay
2213336%5%6%8%56%
2340
16th to endDay
5%413435%5%7%9%47%
2270
September1st to 15thDay
10%3145%3445%7%48%
1980
16th to endDay
9%31342445%7%52%
1837
October1st to 15thDay
8%323424345%57%
1773
16th to endDay
6%3321222470%
1760
November1st to 15thDay
7%413323345%61%
1680
16th to endDay
11%31321123463%
1620
December1st to 15thDay
12%7%1432334453%
1620
16th to endDay
13%5%2422335%5%51%
1728
January1st to 15thNight
10%323312235%61%
2327
16th to endNight
10%422113335%61%
2493
February1st to 15thNight
10%5%2332233458%
2102
16th to endNight
12%422213336%59%
1894
March1st to 15thNight
11%6%13414335%53%
2010
16th to endNight
8%324223337%57%
2112
April1st to 15thNight
7%31342435%6%56%
1977
16th to endNight
9%323322346%58%
1679
May1st to 15thNight
9%4234245%46%52%
1619
16th to endNight
6%31432435%9%55%
1683
June1st to 15thNight
21322346%10%63%
1620
16th to endNight
3113224448%64%
1620
July1st to 15thNight
321322446%9%58%
1620
16th to endNight
111121337%11%63%
1702
August1st to 15thNight
11222435%8%66%
1620
16th to endNight
43133245%6%12%52%
1928
September1st to 15thNight
8%313423447%53%
1980
16th to endNight
5%21432435%7%58%
1848
October1st to 15thNight
7%312322346%62%
1845
16th to endNight
7%3131123469%
2112
November1st to 15thNight
5%31432333366%
2175
16th to endNight
11%42321233460%
2340
December1st to 15thNight
12%413223335%56%
2340
16th to endNight
11%5%24323336%53%
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%5%23323135%58%
1611
16th to endDay
11%413213345%57%
1740
February1st to 15thDay
11%323312335%58%
1750
16th to endDay
13%5%1321222459%
1580
March1st to 15thDay
15%5%14324345%50%
1948
16th to endDay
12%5%24213436%54%
2110
April1st to 15thDay
8%325%324446%55%
1971
16th to endDay
10%5%2332345%5%54%
2276
May1st to 15thDay
12%5%35%42335%5%48%
2331
16th to endDay
9%424426%5%5%7%45%
2430
June1st to 15thDay
4313325%46%7%57%
2340
16th to endDay
5%31342445%9%54%
2340
July1st to 15thDay
6%2245%35%5%5%9%49%
2340
16th to endDay
3114346%5%7%11%51%
2466
August1st to 15thDay
2213435%5%6%8%56%
2340
16th to endDay
5%3235%36%5%7%9%47%
2270
September1st to 15thDay
10%3145%3445%7%49%
1980
16th to endDay
9%31333445%7%52%
1837
October1st to 15thDay
9%313424346%57%
1773
16th to endDay
6%31321222470%
1760
November1st to 15thDay
7%413323345%61%
1680
16th to endDay
11%31321223463%
1620
December1st to 15thDay
12%6%1431334453%
1620
16th to endDay
13%5%14323345%51%
1728
January1st to 15thNight
9%422312235%61%
2327
16th to endNight
10%422113335%61%
2493
February1st to 15thNight
10%5%2321233459%
2102
16th to endNight
11%422213236%59%
1894
March1st to 15thNight
12%5%23323335%54%
2010
16th to endNight
8%313223346%57%
2112
April1st to 15thNight
7%31332335%7%56%
1977
16th to endNight
10%323312346%58%
1679
May1st to 15thNight
9%3243145%46%52%
1619
16th to endNight
6%31431445%9%56%
1683
June1st to 15thNight
211231345%10%63%
1620
16th to endNight
322323448%64%
1620
July1st to 15thNight
411332446%9%58%
1620
16th to endNight
111121346%10%64%
1702
August1st to 15thNight
11211345%9%66%
1620
16th to endNight
431332446%12%53%
1928
September1st to 15thNight
7%413423447%54%
1980
16th to endNight
5%31432335%7%57%
1848
October1st to 15thNight
7%312322246%62%
1845
16th to endNight
7%21221123469%
2112
November1st to 15thNight
5%31332343366%
2175
16th to endNight
11%42321233461%
2340
December1st to 15thNight
12%412313335%57%
2340
16th to endNight
11%5%24313346%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%26%20%29%10%
1612
16th to endDay
28%36%18%30%12%
1740
February1st to 15thDay
28%45%20%27%12%
1751
16th to endDay
31%25%18%26%15%
1580
March1st to 15thDay
37%37%16%23%11%
1948
16th to endDay
32%49%22%21%10%
2112
April1st to 15thDay
29%49%23%17%13%
1971
16th to endDay
30%49%20%24%10%
2276
May1st to 15thDay
36%5%9%18%21%9%
2331
16th to endDay
35%7%13%20%20%3
2434
June1st to 15thDay
24%6%14%26%24%4
2340
16th to endDay
26%5%13%26%21%6%
2340
July1st to 15thDay
28%6%17%27%17%2
2201
16th to endDay
21%8%16%30%21%1
2311
August1st to 15thDay
21%6%15%27%24%3
2326
16th to endDay
29%7%14%28%16%3
2270
September1st to 15thDay
32%5%10%20%22%7%
1980
16th to endDay
30%48%20%24%11%
1837
October1st to 15thDay
27%48%23%21%14%
1773
16th to endDay
20%16%21%30%19%
1760
November1st to 15thDay
25%47%24%26%12%
1680
16th to endDay
26%25%18%28%18%
1620
December1st to 15thDay
34%25%21%26%8%
1620
16th to endDay
34%35%22%25%8%
1728
January1st to 15thNight
27%25%18%30%15%
2327
16th to endNight
25%26%18%30%16%
2493
February1st to 15thNight
29%27%16%25%18%
2112
16th to endNight
27%37%19%25%16%
1894
March1st to 15thNight
33%46%17%22%15%
2010
16th to endNight
27%5%11%21%25%8%
2112
April1st to 15thNight
27%410%20%19%17%
1977
16th to endNight
26%411%19%26%11%
1679
May1st to 15thNight
30%5%10%20%21%10%
1620
16th to endNight
25%6%15%24%24%4
1685
June1st to 15thNight
15%6%13%33%22%7%
1620
16th to endNight
19%6%11%29%26%7%
1620
July1st to 15thNight
21%5%12%34%21%5%
1530
16th to endNight
13%5%17%34%25%3
1594
August1st to 15thNight
14%412%31%29%7%
1610
16th to endNight
23%6%12%30%21%5%
1928
September1st to 15thNight
28%5%11%21%23%9%
1980
16th to endNight
25%48%21%25%14%
1848
October1st to 15thNight
22%310%23%22%17%
1845
16th to endNight
19%25%17%31%23%
2112
November1st to 15thNight
22%45%25%24%17%
2175
16th to endNight
27%25%15%30%18%
2340
December1st to 15thNight
29%36%21%26%11%
2340
16th to endNight
32%26%21%24%12%
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
20%8%32%28%7%2
90
16th to endDay
8%8%45%23%12%1
96
February1st to 15thDay
5%13%36%34%10%
90
16th to endDay
14%8%40%23%12%
81
March1st to 15thDay
20%16%26%30%6%
90
16th to endDay
8%13%32%34%8%3
96
April1st to 15thDay
11%18%27%24%17%
90
16th to endDay
12%12%40%22%11%
386
May1st to 15thDay
14%7%38%29%8%1
468
16th to endDay
15%5%30%31%13%3
517
June1st to 15thDay
5%215%43%27%6%
495
16th to endDay
5%114%38%30%9%
495
July1st to 15thDay
7%7%37%36%10%
475
16th to endDay
1426%48%18%
515
August1st to 15thDay
4327%48%15%
493
16th to endDay
9%15%35%33%15%
310
September1st to 15thDay
120%48%28%
135
16th to endDay
7%321%42%25%
96
October1st to 15thDay
11%47%30%11%
90
16th to endDay
13%5%13%37%26%4
96
November1st to 15thDay
15%231%33%14%3
90
16th to endDay
23%16%26%21%8%3
90
December1st to 15thDay
17%6%28%30%12%4
90
16th to endDay
10%15%40%25%8%
96
January1st to 15thNight
12%8%32%37%9%
900
16th to endNight
12%8%33%36%7%
957
February1st to 15thNight
13%8%35%36%5%
704
16th to endNight
14%10%47%26%2
632
March1st to 15thNight
14%9%40%30%5%
570
16th to endNight
9%10%43%31%5%
576
April1st to 15thNight
9%11%45%30%4
539
16th to endNight
10%8%44%29%7%
540
May1st to 15thNight
10%6%42%31%7%1
540
16th to endNight
6%334%37%17%1
563
June1st to 15thNight
3122%51%19%2
540
16th to endNight
2116%50%26%2
540
July1st to 15thNight
5%110%47%32%2
510
16th to endNight
35%47%41%2
564
August1st to 15thNight
1243%46%3
539
16th to endNight
5%442%40%5%
573
September1st to 15thNight
9%18%38%40%2
540
16th to endNight
6%11%43%34%2
501
October1st to 15thNight
9%223%40%23%2
525
16th to endNight
8%5%29%36%19%
704
November1st to 15thNight
6%5%32%36%17%1
775
16th to endNight
14%7%34%32%10%
900
December1st to 15thNight
16%7%32%36%7%
900
16th to endNight
14%7%37%32%8%
960
Page generated at 2017-09-19 06:32:29. Version ac04

Copyright 2017 A. Danko


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