Lake Livingston State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Livingston State Park clear sky chart from 2005-11-05 to 2017-09-21.

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%
15436
24%
46938
17%
15389
57%
15389
31%
28101

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
33%
900
24%
2327
10%
895
41%
895
27%
1530
January16th to endNight
31%
960
26%
2496
10%
960
40%
960
30%
1635
February1st to 15thNight
30%
815
23%
2223
9%
811
39%
811
27%
1446
February16th to endNight
25%
510
26%
1772
10%
510
41%
510
21%
1101
March1st to 15thNight
30%
540
24%
1980
15%
540
41%
540
21%
1234
March16th to endNight
37%
576
21%
2112
15%
576
47%
576
25%
1248
April1st to 15thNight
35%
539
21%
1920
14%
539
47%
539
25%
1127
April16th to endNight
38%
540
23%
1800
17%
540
49%
540
26%
1088
May1st to 15thNight
36%
539
18%
1715
12%
539
46%
539
25%
1069
May16th to endNight
58%
563
24%
1684
23%
561
64%
561
38%
941
June1st to 15thNight
76%
540
20%
1620
22%
540
80%
540
43%
869
June16th to endNight
76%
540
18%
1620
21%
540
78%
540
35%
952
July1st to 15thNight
77%
510
18%
1530
21%
510
79%
510
38%
873
July16th to endNight
82%
564
18%
1594
22%
531
84%
531
37%
915
August1st to 15thNight
89%
539
27%
1616
31%
536
89%
536
55%
764
August16th to endNight
74%
573
15%
1910
17%
573
75%
573
26%
1182
September1st to 15thNight
70%
540
18%
1956
20%
540
72%
540
28%
1108
September16th to endNight
73%
510
28%
1881
31%
510
74%
510
31%
1043
October1st to 15thNight
69%
621
32%
1941
27%
621
73%
621
43%
1019
October16th to endNight
59%
704
36%
2112
26%
704
65%
704
45%
1094
November1st to 15thNight
51%
700
28%
2100
20%
700
56%
700
34%
1226
November16th to endNight
44%
753
33%
2193
20%
753
54%
753
34%
1280
December1st to 15thNight
36%
900
25%
2340
12%
900
44%
900
26%
1604
December16th to endNight
31%
960
20%
2496
8%
960
38%
960
23%
1753

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
11%5%25%5%35%5%6%7%40%
47917
Night
11%5%2442445%8%48%
47135
TransparencyDay
42%6%11%17%16%6%
47617
Night
34%5%12%20%17%8%
46940
SeeingDay
11%5%17%26%28%12%
5458
Night
14%6%22%32%20%2
15437

By Month

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
18%5%34423246%43%
1611
16th to endDay
20%6%24322336%44%
1728
February1st to 15thDay
17%7%35%423335%43%
1648
16th to endDay
19%6%44424345%41%
1700
March1st to 15thDay
22%6%24424346%39%
1980
16th to endDay
14%7%345%24436%42%
2110
April1st to 15thDay
13%6%36%42446%6%41%
2028
16th to endDay
11%5%36%6%45%45%6%40%
2160
May1st to 15thDay
11%5%27%7%37%6%6%8%34%
2232
16th to endDay
6%5%26%7%46%6%7%9%36%
2430
June1st to 15thDay
5%4246%47%7%8%11%37%
2340
16th to endDay
6%425%7%5%8%8%9%11%29%
2340
July1st to 15thDay
8%435%7%38%7%9%9%33%
2340
16th to endDay
7%336%7%5%7%7%8%10%32%
2466
August1st to 15thDay
43135%46%7%7%12%44%
2334
16th to endDay
8%5%27%7%48%6%7%9%33%
2292
September1st to 15thDay
9%326%5%46%6%6%8%39%
2001
16th to endDay
8%4246%46%5%6%6%43%
1871
October1st to 15thDay
8%315%424446%52%
1675
16th to endDay
11%21331335%6%58%
1760
November1st to 15thDay
8%5%26%43445%6%46%
1758
16th to endDay
13%6%23324335%50%
1765
December1st to 15thDay
17%9%26%413436%39%
1620
16th to endDay
18%9%36%424445%36%
1728
January1st to 15thNight
17%8%24322346%44%
2327
16th to endNight
19%6%23312335%46%
2496
February1st to 15thNight
15%7%24313346%45%
2213
16th to endNight
16%6%245%2343445%
1772
March1st to 15thNight
20%6%3432325%5%43%
1980
16th to endNight
11%7%24324446%47%
2112
April1st to 15thNight
9%5%35%4345%5%8%45%
1920
16th to endNight
13%425%42445%7%46%
1800
May1st to 15thNight
9%5%45%6%2445%9%42%
1715
16th to endNight
5%41441447%11%49%
1683
June1st to 15thNight
321331446%12%55%
1620
16th to endNight
3323426%6%7%12%46%
1620
July1st to 15thNight
5%4243245%7%12%47%
1620
16th to endNight
3223435%6%9%12%46%
1702
August1st to 15thNight
211212336%11%62%
1626
16th to endNight
7%3245%35%5%7%12%41%
1910
September1st to 15thNight
8%4245%25%5%5%10%45%
1956
16th to endNight
6%4134345%5%9%49%
1881
October1st to 15thNight
5%213324448%59%
1941
16th to endNight
10%312312235%63%
2112
November1st to 15thNight
10%424323446%52%
2100
16th to endNight
13%424322245%54%
2193
December1st to 15thNight
17%8%34425%35%5%40%
2340
16th to endNight
17%9%36%42333441%
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
42%25%14%22%10%
1612
16th to endDay
42%36%15%20%12%
1728
February1st to 15thDay
44%35%16%19%10%
1649
16th to endDay
46%36%14%19%9%
1700
March1st to 15thDay
48%28%11%21%6%
1980
16th to endDay
44%47%15%22%6%
2112
April1st to 15thDay
44%46%17%17%9%
2028
16th to endDay
44%410%16%17%7%
2160
May1st to 15thDay
48%6%9%14%13%6%
2232
16th to endDay
43%7%11%20%14%2
2434
June1st to 15thDay
39%8%14%20%15%1
2340
16th to endDay
44%11%14%17%9%1
2340
July1st to 15thDay
42%9%17%20%8%
2201
16th to endDay
42%9%20%21%6%
2311
August1st to 15thDay
30%8%20%29%10%
2320
16th to endDay
45%9%17%18%6%1
2292
September1st to 15thDay
41%8%14%17%12%5%
2001
16th to endDay
39%7%10%19%15%7%
1871
October1st to 15thDay
33%5%10%18%16%15%
1675
16th to endDay
28%35%13%32%17%
1760
November1st to 15thDay
38%49%18%20%9%
1758
16th to endDay
37%35%13%24%15%
1765
December1st to 15thDay
47%39%16%16%7%
1620
16th to endDay
50%37%16%15%7%
1728
January1st to 15thNight
41%36%15%20%12%
2327
16th to endNight
41%26%14%21%13%
2496
February1st to 15thNight
41%25%15%20%13%
2223
16th to endNight
43%35%14%17%14%
1772
March1st to 15thNight
44%37%14%19%11%
1980
16th to endNight
38%412%15%20%8%
2112
April1st to 15thNight
38%411%18%16%11%
1920
16th to endNight
38%49%20%17%9%
1800
May1st to 15thNight
39%6%13%16%16%8%
1716
16th to endNight
28%6%18%28%15%3
1685
June1st to 15thNight
21%8%16%31%19%1
1620
16th to endNight
27%10%21%27%12%1
1620
July1st to 15thNight
26%8%28%27%9%
1530
16th to endNight
23%11%31%27%5%
1594
August1st to 15thNight
14%6%28%38%12%
1616
16th to endNight
34%10%25%21%5%2
1910
September1st to 15thNight
33%7%21%20%12%5%
1956
16th to endNight
31%6%12%21%18%8%
1881
October1st to 15thNight
24%49%26%18%16%
1941
16th to endNight
25%25%15%32%19%
2112
November1st to 15thNight
32%410%20%22%8%
2100
16th to endNight
34%27%13%25%16%
2193
December1st to 15thNight
45%37%18%16%8%
2340
16th to endNight
48%36%14%17%9%
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
32%5%32%18%11%
90
16th to endDay
17%17%41%14%8%
96
February1st to 15thDay
12%20%36%27%3
90
16th to endDay
22%13%40%20%2
81
March1st to 15thDay
32%15%37%7%6%
90
16th to endDay
14%11%33%27%13%
96
April1st to 15thDay
17%14%29%26%11%
147
16th to endDay
21%11%23%27%14%2
270
May1st to 15thDay
16%11%30%27%13%1
369
16th to endDay
9%6%28%33%19%2
517
June1st to 15thDay
6%19%40%31%9%
495
16th to endDay
8%112%28%33%15%
495
July1st to 15thDay
6%8%29%36%19%
475
16th to endDay
41319%45%24%
515
August1st to 15thDay
5%118%51%22%
487
16th to endDay
15%417%35%27%
332
September1st to 15thDay
3110%17%44%22%
156
16th to endDay
5%5%24%39%24%
105
October1st to 15thDay
415%42%25%12%
90
16th to endDay
17%415%17%35%9%
96
November1st to 15thDay
11%336%32%15%1
90
16th to endDay
17%14%30%24%8%4
90
December1st to 15thDay
23%8%27%28%5%5%
90
16th to endDay
26%17%36%17%2
96
January1st to 15thNight
22%11%28%29%8%
900
16th to endNight
23%11%30%28%5%
960
February1st to 15thNight
20%11%34%28%5%
815
16th to endNight
19%12%39%26%2
510
March1st to 15thNight
24%9%32%28%5%
540
16th to endNight
13%11%35%30%9%
576
April1st to 15thNight
13%8%39%28%9%
539
16th to endNight
17%7%32%32%9%
540
May1st to 15thNight
12%6%37%31%10%
540
16th to endNight
8%324%40%20%2
563
June1st to 15thNight
410%46%34%3
540
16th to endNight
429%41%38%4
540
July1st to 15thNight
6%6%43%34%8%
510
16th to endNight
4232%52%6%
564
August1st to 15thNight
3337%49%6%
539
16th to endNight
9%430%48%6%
573
September1st to 15thNight
8%17%29%44%9%
540
16th to endNight
8%17%31%43%6%
510
October1st to 15thNight
6%214%38%32%4
621
16th to endNight
12%322%34%24%2
704
November1st to 15thNight
12%6%24%34%20%2
700
16th to endNight
16%9%26%30%15%1
753
December1st to 15thNight
22%10%25%29%11%1
900
16th to endNight
25%11%26%29%6%
960
Page generated at 2017-09-22 06:35:30. Version ac04

Copyright 2017 A. Danko


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