Lockhart State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lockhart State Park clear sky chart from 2005-11-06 to 2024-01-13.

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
49%
23712
24%
74301
17%
23657
57%
23657
31%
43737

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 10thNight
38%
947
27%
2458
12%
946
47%
946
35%
1525
January11th to 20thNight
38%
915
25%
2379
11%
915
45%
915
32%
1509
January21st to endNight
36%
904
28%
2488
12%
904
46%
904
29%
1574
February1st to 10thNight
31%
720
25%
2160
10%
720
42%
720
25%
1366
February11th to 20thNight
29%
704
21%
2098
9%
700
38%
700
28%
1304
February21st to endNight
21%
585
24%
1769
6%
585
36%
585
23%
1131
March1st to 10thNight
28%
540
23%
1980
9%
540
44%
540
21%
1209
March11th to 20thNight
28%
540
20%
1980
12%
540
38%
540
20%
1245
March21st to endNight
30%
594
24%
2178
14%
594
44%
594
25%
1248
April1st to 10thNight
29%
540
23%
1980
12%
540
44%
540
24%
1168
April11th to 20thNight
30%
533
20%
1953
12%
533
44%
533
24%
1167
April21st to endNight
31%
540
27%
1693
14%
540
48%
540
27%
1050
May1st to 10thNight
33%
540
23%
1620
17%
540
42%
540
27%
1040
May11th to 20thNight
44%
531
21%
1594
19%
531
51%
531
30%
988
May21st to endNight
48%
583
21%
1745
16%
582
57%
582
31%
1060
June1st to 10thNight
70%
540
23%
1620
24%
540
74%
540
45%
849
June11th to 20thNight
62%
540
24%
1620
21%
540
71%
540
46%
840
June21st to endNight
70%
540
21%
1620
23%
540
73%
540
33%
977
July1st to 10thNight
71%
525
17%
1575
18%
525
74%
525
33%
948
July11th to 20thNight
81%
522
25%
1566
26%
522
85%
522
49%
794
July21st to endNight
81%
591
25%
1673
26%
558
84%
558
49%
852
August1st to 10thNight
87%
537
27%
1601
29%
534
89%
534
59%
728
August11th to 20thNight
79%
534
23%
1732
26%
534
80%
534
35%
971
August21st to endNight
79%
594
19%
2107
22%
594
81%
594
32%
1159
September1st to 10thNight
75%
540
20%
1980
24%
540
76%
540
30%
1111
September11th to 20thNight
71%
540
21%
1980
23%
540
72%
540
27%
1188
September21st to endNight
68%
540
24%
1980
26%
540
71%
540
32%
1082
October1st to 10thNight
77%
540
35%
1980
36%
540
80%
540
42%
946
October11th to 20thNight
58%
666
31%
2106
23%
666
63%
666
35%
1201
October21st to endNight
53%
792
32%
2376
21%
792
60%
792
39%
1314
November1st to 10thNight
57%
740
27%
2220
20%
740
61%
740
34%
1316
November11th to 20thNight
50%
828
26%
2348
16%
828
56%
828
35%
1408
November21st to endNight
40%
950
26%
2470
12%
950
47%
950
31%
1600
December1st to 10thNight
44%
950
28%
2470
15%
950
49%
950
32%
1596
December11th to 20thNight
35%
949
24%
2887
11%
948
41%
948
23%
1890
December21st to endNight
38%
1038
16%
4315
12%
1026
45%
1026
23%
2383

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
12%6%25%5%35%5%5%7%45%
74891
Night
13%5%2442445%7%50%
74874
TransparencyDay
37%7%11%19%18%9%
74616
Night
33%6%12%20%18%11%
74669
SeeingDay
13%6%18%28%26%10%
13681
Night
15%6%25%36%17%1
23724

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 10thDay
16%7%345%23346%48%
1707
11th to 20thDay
20%6%2442334447%
1643
21st to endDay
16%6%23423346%51%
1881
February1st to 10thDay
22%6%26%42334444%
1800
11th to 20thDay
20%8%34324346%41%
1749
21st to endDay
18%6%35%424345%46%
1484
March1st to 10thDay
20%8%35%5%35%446%39%
1980
11th to 20thDay
18%5%35%434446%43%
1980
21st to endDay
17%5%26%42435%6%46%
2178
April1st to 10thDay
15%9%36%4345%46%41%
1980
11th to 20thDay
17%7%35%6%44446%41%
1956
21st to endDay
14%7%35%33445%6%45%
2260
May1st to 10thDay
14%6%36%5%35%6%6%6%39%
2340
11th to 20thDay
12%7%37%6%45%6%5%7%39%
2302
21st to endDay
12%7%36%6%46%6%7%9%34%
2531
June1st to 10thDay
5%325%6%35%7%7%11%45%
2340
11th to 20thDay
7%325%5%46%6%7%9%46%
2340
21st to endDay
6%5%36%7%5%7%7%7%10%36%
2340
July1st to 10thDay
10%5%37%7%46%6%6%10%35%
2340
11th to 20thDay
5%3246%46%7%7%11%46%
2340
21st to endDay
43145%47%6%8%12%47%
2546
August1st to 10thDay
32145%25%46%11%58%
2328
11th to 20thDay
5%3245%45%6%7%10%51%
2164
21st to endDay
5%326%6%46%7%8%12%41%
2246
September1st to 10thDay
7%5%36%8%45%5%6%7%44%
1980
11th to 20thDay
10%6%36%7%45%5%7%8%39%
1980
21st to endDay
8%5%25%436%5%6%8%48%
1980
October1st to 10thDay
7%4245%245%6%8%53%
1980
11th to 20thDay
12%5%25%424447%51%
1834
21st to endDay
11%42442335%5%56%
1980
November1st to 10thDay
12%8%345%3345%7%46%
1858
11th to 20thDay
12%5%25%5%24346%51%
1828
21st to endDay
18%8%25%424436%44%
1710
December1st to 10thDay
17%7%35%424447%44%
1710
11th to 20thDay
18%7%35%5%2445%5%43%
2161
21st to endDay
16%7%24423335%51%
3135
January1st to 10thNight
18%5%23323347%51%
2458
11th to 20thNight
19%5%24323345%51%
2379
21st to endNight
18%6%34323435%49%
2488
February1st to 10thNight
19%6%24423446%46%
2160
11th to 20thNight
20%6%24323335%49%
2098
21st to endNight
22%6%24314347%44%
1769
March1st to 10thNight
18%6%25%334447%45%
1980
11th to 20thNight
17%8%35%5%24446%43%
1980
21st to endNight
15%6%34323446%49%
2178
April1st to 10thNight
14%5%25%425%46%8%45%
1980
11th to 20thNight
16%6%35%42445%7%44%
1953
21st to endNight
15%5%3442445%5%48%
1693
May1st to 10thNight
13%5%36%5%3445%9%43%
1620
11th to 20thNight
13%5%25%436%5%5%8%45%
1593
21st to endNight
11%435%43447%11%44%
1745
June1st to 10thNight
5%41332345%9%60%
1620
11th to 20thNight
421343445%11%58%
1620
21st to endNight
6%435%5%36%6%6%7%50%
1620
July1st to 10thNight
7%4346%35%5%7%11%46%
1620
11th to 20thNight
321332447%11%61%
1620
21st to endNight
322332446%12%58%
1772
August1st to 10thNight
121122345%9%71%
1611
11th to 20thNight
5%314425%6%9%10%51%
1732
21st to endNight
5%414435%6%7%11%50%
2107
September1st to 10thNight
8%425%5%35%5%5%9%49%
1980
11th to 20thNight
9%6%25%6%345%6%7%47%
1980
21st to endNight
7%425%4246%6%8%52%
1980
October1st to 10thNight
6%32342345%8%61%
1980
11th to 20thNight
12%5%24333346%54%
2106
21st to endNight
13%5%23322335%60%
2376
November1st to 10thNight
12%6%2432435%6%54%
2220
11th to 20thNight
11%6%2442445%5%53%
2348
21st to endNight
18%5%24424348%46%
2470
December1st to 10thNight
16%7%3432335%6%48%
2470
11th to 20thNight
18%7%25%433345%45%
3036
21st to endNight
18%7%23323235%53%
4532

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 10thDay
38%5%6%15%24%12%
1708
11th to 20thDay
42%36%15%19%15%
1643
21st to endDay
37%46%14%24%14%
1881
February1st to 10thDay
45%46%11%19%15%
1800
11th to 20thDay
45%47%16%16%11%
1759
21st to endDay
42%5%8%14%17%14%
1484
March1st to 10thDay
46%6%9%12%17%9%
1980
11th to 20thDay
42%6%8%11%19%14%
1980
21st to endDay
39%5%9%17%18%12%
2178
April1st to 10thDay
43%6%8%17%15%11%
1980
11th to 20thDay
44%5%7%14%19%11%
1956
21st to endDay
40%5%7%19%19%9%
2260
May1st to 10thDay
42%8%9%16%17%8%
2340
11th to 20thDay
42%8%9%19%17%4
2306
21st to endDay
43%8%14%19%15%1
2531
June1st to 10thDay
29%10%15%25%19%3
2340
11th to 20thDay
32%8%13%26%17%4
2340
21st to endDay
39%11%14%22%12%3
2340
July1st to 10thDay
42%9%14%24%10%2
2276
11th to 20thDay
27%10%21%24%16%2
2271
21st to endDay
24%11%21%32%11%1
2405
August1st to 10thDay
20%10%17%34%18%1
2314
11th to 20thDay
28%10%19%28%12%4
2164
21st to endDay
33%10%18%25%11%2
2246
September1st to 10thDay
37%10%10%21%15%7%
1980
11th to 20thDay
41%9%13%16%16%5%
1980
21st to endDay
32%8%12%20%16%12%
1980
October1st to 10thDay
28%8%11%20%22%11%
1980
11th to 20thDay
34%7%9%14%20%16%
1834
21st to endDay
29%5%7%16%23%20%
1980
November1st to 10thDay
38%6%10%17%19%10%
1858
11th to 20thDay
35%5%9%17%19%14%
1828
21st to endDay
43%47%14%19%13%
1710
December1st to 10thDay
41%5%9%18%19%7%
1710
11th to 20thDay
42%7%6%10%21%13%
2159
21st to endDay
38%35%17%24%13%
3135
January1st to 10thNight
35%47%15%22%16%
2458
11th to 20thNight
37%37%17%21%15%
2379
21st to endNight
40%35%14%20%18%
2488
February1st to 10thNight
41%5%7%13%18%17%
2160
11th to 20thNight
40%37%16%19%14%
2098
21st to endNight
43%47%15%15%15%
1769
March1st to 10thNight
41%6%11%16%17%10%
1980
11th to 20thNight
43%6%9%11%17%14%
1980
21st to endNight
36%5%11%16%18%13%
2178
April1st to 10thNight
37%7%10%18%17%11%
1980
11th to 20thNight
39%5%11%14%16%15%
1953
21st to endNight
38%6%9%20%17%9%
1693
May1st to 10thNight
39%7%11%18%16%9%
1620
11th to 20thNight
36%8%12%24%17%4
1594
21st to endNight
33%9%17%27%14%1
1746
June1st to 10thNight
21%7%17%29%22%3
1620
11th to 20thNight
20%7%16%33%19%4
1620
21st to endNight
30%10%16%27%14%2
1620
July1st to 10thNight
30%10%21%29%9%1
1575
11th to 20thNight
16%10%27%31%16%1
1566
21st to endNight
17%9%28%37%9%
1673
August1st to 10thNight
11%7%26%37%17%1
1601
11th to 20thNight
23%13%23%29%10%2
1732
21st to endNight
24%13%22%28%10%3
2107
September1st to 10thNight
30%8%18%22%14%6%
1980
11th to 20thNight
34%9%15%22%14%5%
1980
21st to endNight
28%8%15%20%16%11%
1980
October1st to 10thNight
21%6%12%27%22%12%
1980
11th to 20thNight
31%6%10%17%19%17%
2106
21st to endNight
29%47%17%22%22%
2376
November1st to 10thNight
31%7%10%18%20%13%
2220
11th to 20thNight
33%5%10%18%19%15%
2348
21st to endNight
39%49%17%18%14%
2470
December1st to 10thNight
38%5%8%20%18%11%
2470
11th to 20thNight
41%5%7%11%19%17%
3037
21st to endNight
36%46%14%28%12%
4532

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 10thDay
20%10%33%28%7%1
270
11th to 20thDay
23%13%23%29%10%2
248
21st to endDay
20%11%34%25%9%
264
February1st to 10thDay
31%12%28%18%11%
240
11th to 20thDay
26%14%32%19%7%1
240
21st to endDay
26%14%37%21%2
198
March1st to 10thDay
23%11%38%21%8%
240
11th to 20thDay
17%14%37%23%8%1
240
21st to endDay
17%13%33%27%9%1
264
April1st to 10thDay
22%9%38%23%7%
240
11th to 20thDay
19%14%30%25%11%1
234
21st to endDay
18%11%35%25%11%1
520
May1st to 10thDay
15%11%31%31%11%
603
11th to 20thDay
15%7%25%33%18%2
625
21st to endDay
12%6%21%38%20%3
679
June1st to 10thDay
6%210%40%34%9%
630
11th to 20thDay
6%211%42%33%6%
630
21st to endDay
7%210%32%34%15%
630
July1st to 10thDay
8%17%31%38%15%
621
11th to 20thDay
315%24%50%17%
618
21st to endDay
31425%49%19%
684
August1st to 10thDay
31224%49%20%
626
11th to 20thDay
4324%45%23%
478
21st to endDay
5%25%18%32%38%
365
September1st to 10thDay
10%317%42%29%
270
11th to 20thDay
7%1120%45%26%
270
21st to endDay
11%27%19%36%25%
270
October1st to 10thDay
6%110%27%40%16%
270
11th to 20thDay
12%316%32%27%10%
270
21st to endDay
17%11%20%26%19%7%
297
November1st to 10thDay
15%7%19%33%19%6%
270
11th to 20thDay
20%5%24%28%20%4
270
21st to endDay
25%11%29%19%14%2
270
December1st to 10thDay
19%6%28%30%11%6%
270
11th to 20thDay
23%14%26%26%11%1
270
21st to endDay
21%10%30%27%10%2
297
January1st to 10thNight
21%7%30%33%9%1
950
11th to 20thNight
22%9%29%32%9%
915
21st to endNight
22%8%29%34%7%
904
February1st to 10thNight
25%9%31%29%6%
720
11th to 20thNight
25%10%34%28%4
704
21st to endNight
25%14%37%21%3
585
March1st to 10thNight
21%11%37%27%4
540
11th to 20thNight
21%9%36%27%6%
540
21st to endNight
17%10%39%29%41
594
April1st to 10thNight
15%9%44%29%3
540
11th to 20thNight
17%11%40%28%5%
533
21st to endNight
16%10%40%26%8%
540
May1st to 10thNight
15%8%41%30%6%
540
11th to 20thNight
14%334%38%11%
531
21st to endNight
12%331%40%14%
584
June1st to 10thNight
5%119%49%25%1
540
11th to 20thNight
5%26%50%17%1
540
21st to endNight
6%214%45%29%4
540
July1st to 10thNight
6%111%48%31%4
525
11th to 20thNight
410%49%35%2
522
21st to endNight
37%49%37%4
591
August1st to 10thNight
215%52%36%4
537
11th to 20thNight
5%16%48%36%4
534
21st to endNight
6%16%37%45%5%
594
September1st to 10thNight
9%15%40%39%6%
540
11th to 20thNight
10%27%35%43%4
540
21st to endNight
9%112%33%40%4
540
October1st to 10thNight
5%211%46%31%5%
540
11th to 20thNight
15%320%41%20%2
666
21st to endNight
13%8%24%34%20%2
792
November1st to 10thNight
12%5%21%39%21%1
740
11th to 20thNight
13%7%24%38%17%1
828
21st to endNight
20%8%27%31%13%1
950
December1st to 10thNight
21%6%24%36%12%1
950
11th to 20thNight
25%9%27%31%8%
950
21st to endNight
20%8%28%36%8%
1045
Page generated at 2024-01-10 18:35:21. Version ac07

Copyright 2024 Attilla Danko


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