Bastrop State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bastrop State Park clear sky chart from 2005-11-06 to 2024-01-14.

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
48%
23739
25%
74281
17%
23686
56%
23686
32%
43123

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
36%
947
28%
2458
12%
946
45%
946
33%
1537
January11th to 20thNight
35%
918
27%
2386
12%
918
44%
918
31%
1507
January21st to endNight
33%
950
29%
2534
11%
950
44%
950
31%
1604
February1st to 10thNight
31%
720
25%
2160
10%
720
41%
720
23%
1367
February11th to 20thNight
28%
704
21%
2098
10%
700
37%
700
27%
1309
February21st to endNight
20%
561
25%
1745
7%
561
36%
561
22%
1119
March1st to 10thNight
26%
540
24%
1980
10%
540
42%
540
22%
1200
March11th to 20thNight
30%
540
21%
1980
13%
540
40%
540
21%
1220
March21st to endNight
28%
594
25%
2178
14%
594
43%
594
25%
1236
April1st to 10thNight
27%
540
23%
1980
12%
540
43%
540
24%
1152
April11th to 20thNight
27%
533
22%
1934
13%
533
42%
533
25%
1131
April21st to endNight
29%
540
27%
1716
14%
540
46%
540
29%
1024
May1st to 10thNight
31%
540
23%
1620
15%
540
41%
540
27%
1018
May11th to 20thNight
42%
531
23%
1594
20%
531
49%
531
32%
952
May21st to endNight
49%
582
23%
1745
18%
582
59%
582
34%
1037
June1st to 10thNight
71%
540
23%
1620
23%
540
76%
540
47%
827
June11th to 20thNight
62%
540
24%
1620
22%
540
71%
540
47%
832
June21st to endNight
71%
540
22%
1620
23%
540
74%
540
35%
941
July1st to 10thNight
73%
525
17%
1575
20%
525
74%
525
35%
927
July11th to 20thNight
80%
522
26%
1566
27%
522
85%
522
50%
777
July21st to endNight
82%
591
24%
1673
26%
558
85%
558
51%
846
August1st to 10thNight
87%
537
29%
1601
29%
534
91%
534
61%
723
August11th to 20thNight
79%
534
25%
1671
27%
534
81%
534
39%
915
August21st to endNight
79%
594
19%
2130
22%
594
82%
594
34%
1132
September1st to 10thNight
75%
540
21%
1980
24%
540
78%
540
33%
1073
September11th to 20thNight
70%
540
22%
1980
26%
540
71%
540
27%
1149
September21st to endNight
68%
540
25%
1980
26%
540
71%
540
34%
1044
October1st to 10thNight
75%
540
36%
1980
37%
540
79%
540
45%
904
October11th to 20thNight
57%
696
32%
2136
21%
696
63%
696
38%
1197
October21st to endNight
50%
792
33%
2376
20%
792
58%
792
39%
1303
November1st to 10thNight
56%
740
29%
2220
21%
740
61%
740
36%
1279
November11th to 20thNight
48%
802
27%
2322
16%
802
55%
802
35%
1371
November21st to endNight
38%
950
27%
2470
13%
950
46%
950
31%
1594
December1st to 10thNight
40%
950
29%
2470
14%
950
48%
950
31%
1613
December11th to 20thNight
34%
948
25%
2877
12%
948
41%
948
24%
1874
December21st to endNight
36%
1038
17%
4306
11%
1026
44%
1026
22%
2389

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%35%5%35%5%5%7%45%
74908
Night
12%5%2442445%7%51%
74873
TransparencyDay
38%5%10%20%18%8%
74633
Night
33%5%12%21%19%11%
74668
SeeingDay
14%6%19%27%25%9%
13718
Night
15%7%25%36%16%2
23753

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
17%5%25%424336%49%
1707
11th to 20thDay
19%6%24423446%47%
1647
21st to endDay
15%7%25%423245%51%
1836
February1st to 10thDay
21%7%25%5%23335%42%
1800
11th to 20thDay
20%8%35%333346%43%
1749
21st to endDay
18%8%45%42334446%
1510
March1st to 10thDay
20%7%36%5%2445%6%37%
1980
11th to 20thDay
16%7%35%5%2445%6%42%
1980
21st to endDay
16%7%25%423446%46%
2178
April1st to 10thDay
15%8%35%5%345%5%6%41%
1980
11th to 20thDay
14%7%37%6%34447%41%
1974
21st to endDay
14%7%25%32445%7%46%
2239
May1st to 10thDay
13%6%36%5%46%6%5%7%40%
2340
11th to 20thDay
12%6%37%6%35%5%6%7%41%
2302
21st to endDay
11%6%36%7%46%6%7%9%34%
2531
June1st to 10thDay
5%324435%6%7%10%49%
2340
11th to 20thDay
6%4245%46%6%6%10%49%
2340
21st to endDay
6%6%46%6%5%7%7%8%9%36%
2340
July1st to 10thDay
8%5%46%6%5%6%7%7%9%37%
2340
11th to 20thDay
43246%47%7%8%12%44%
2340
21st to endDay
43235%46%6%7%12%48%
2546
August1st to 10thDay
2213435%5%7%10%57%
2328
11th to 20thDay
5%3145%45%7%7%11%47%
2225
21st to endDay
5%326%7%36%8%8%11%41%
2224
September1st to 10thDay
6%6%36%7%46%5%5%8%43%
1980
11th to 20thDay
9%6%36%7%46%7%6%7%39%
1980
21st to endDay
7%425%6%36%6%6%8%47%
1980
October1st to 10thDay
6%4235%345%5%9%54%
1980
11th to 20thDay
14%5%24424346%53%
1805
21st to endDay
12%414333335%57%
1980
November1st to 10thDay
13%6%35%33445%7%47%
1858
11th to 20thDay
11%6%34435%345%52%
1853
21st to endDay
18%8%34434345%44%
1710
December1st to 10thDay
17%7%36%42345%7%44%
1710
11th to 20thDay
18%7%25%5%34445%44%
2161
21st to endDay
16%7%25%423335%51%
3135
January1st to 10thNight
17%6%23323346%50%
2458
11th to 20thNight
19%5%24323335%52%
2386
21st to endNight
17%5%24424335%50%
2534
February1st to 10thNight
19%8%35%323336%46%
2160
11th to 20thNight
20%7%24322335%48%
2098
21st to endNight
22%6%34424345%43%
1745
March1st to 10thNight
17%6%25%42445%7%43%
1980
11th to 20thNight
16%8%35%5%33346%43%
1980
21st to endNight
14%5%34425%447%49%
2178
April1st to 10thNight
12%7%36%43446%7%46%
1980
11th to 20thNight
16%7%345%23448%45%
1934
21st to endNight
13%6%36%423447%48%
1716
May1st to 10thNight
12%6%36%5%345%5%8%43%
1620
11th to 20thNight
11%6%145%35%5%5%9%47%
1593
21st to endNight
10%5%24425%5%7%10%46%
1745
June1st to 10thNight
431333345%10%60%
1620
11th to 20thNight
4312425%6%6%10%58%
1620
21st to endNight
5%425%5%35%5%7%10%49%
1620
July1st to 10thNight
6%425%435%5%6%11%48%
1620
11th to 20thNight
32123345%7%11%60%
1620
21st to endNight
321332445%13%59%
1772
August1st to 10thNight
11131345%11%69%
1611
11th to 20thNight
4424335%5%8%11%52%
1671
21st to endNight
43235%35%6%8%12%49%
2130
September1st to 10thNight
6%4245%345%6%9%51%
1980
11th to 20thNight
8%6%25%6%45%5%6%7%48%
1980
21st to endNight
8%41443446%8%53%
1980
October1st to 10thNight
442242445%7%63%
1980
11th to 20thNight
12%41432335%5%56%
2136
21st to endNight
13%424223335%60%
2376
November1st to 10thNight
12%5%244335%46%54%
2220
11th to 20thNight
11%5%2443335%7%52%
2322
21st to endNight
18%6%24433346%46%
2470
December1st to 10thNight
16%7%24334445%48%
2470
11th to 20thNight
17%9%35%323446%45%
3036
21st to endNight
17%7%2332334453%
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
39%35%18%23%12%
1708
11th to 20thDay
41%36%17%20%14%
1647
21st to endDay
38%36%14%25%15%
1836
February1st to 10thDay
46%36%12%20%14%
1800
11th to 20thDay
45%37%17%18%10%
1759
21st to endDay
43%47%15%17%14%
1510
March1st to 10thDay
48%49%12%19%9%
1980
11th to 20thDay
45%46%11%20%13%
1980
21st to endDay
40%48%17%21%10%
2178
April1st to 10thDay
44%5%8%18%15%10%
1980
11th to 20thDay
44%47%15%19%11%
1974
21st to endDay
39%46%21%21%8%
2239
May1st to 10thDay
43%6%9%17%16%9%
2340
11th to 20thDay
41%6%10%21%17%5%
2306
21st to endDay
44%7%12%22%14%1
2531
June1st to 10thDay
30%6%15%27%20%2
2340
11th to 20thDay
31%7%13%27%18%4
2340
21st to endDay
40%10%12%22%14%2
2340
July1st to 10thDay
40%8%16%24%10%2
2276
11th to 20thDay
30%7%19%25%17%2
2271
21st to endDay
25%7%23%33%11%1
2405
August1st to 10thDay
22%7%17%36%17%1
2314
11th to 20thDay
29%9%18%29%12%4
2225
21st to endDay
33%9%17%25%12%3
2224
September1st to 10thDay
37%7%10%22%15%7%
1980
11th to 20thDay
42%7%12%17%17%5%
1980
21st to endDay
33%7%9%22%16%13%
1980
October1st to 10thDay
26%6%11%22%23%12%
1980
11th to 20thDay
36%36%15%22%17%
1805
21st to endDay
32%35%15%25%20%
1980
November1st to 10thDay
37%48%19%21%10%
1858
11th to 20thDay
35%49%16%22%14%
1853
21st to endDay
44%46%15%19%12%
1710
December1st to 10thDay
42%39%18%20%8%
1710
11th to 20thDay
45%26%12%23%12%
2159
21st to endDay
39%35%16%26%13%
3135
January1st to 10thNight
37%36%17%23%15%
2458
11th to 20thNight
38%25%17%22%15%
2386
21st to endNight
39%2416%20%18%
2534
February1st to 10thNight
43%46%13%19%16%
2160
11th to 20thNight
41%47%16%19%14%
2098
21st to endNight
45%36%15%16%15%
1745
March1st to 10thNight
41%5%10%16%18%10%
1980
11th to 20thNight
43%5%9%12%19%13%
1980
21st to endNight
36%411%16%20%13%
2178
April1st to 10thNight
38%5%10%18%18%11%
1980
11th to 20thNight
39%410%16%16%15%
1934
21st to endNight
37%49%23%19%8%
1716
May1st to 10thNight
39%5%10%19%17%9%
1620
11th to 20thNight
35%5%12%26%18%4
1594
21st to endNight
32%7%17%29%14%1
1746
June1st to 10thNight
21%6%19%30%22%3
1620
11th to 20thNight
21%6%16%33%20%4
1620
21st to endNight
30%8%16%28%16%2
1620
July1st to 10thNight
30%8%23%30%9%
1575
11th to 20thNight
17%7%26%34%15%1
1566
21st to endNight
17%7%29%37%9%
1673
August1st to 10thNight
11%7%25%39%18%1
1601
11th to 20thNight
24%9%23%31%11%2
1671
21st to endNight
26%9%24%28%10%4
2130
September1st to 10thNight
29%7%18%25%15%6%
1980
11th to 20thNight
34%8%15%22%15%6%
1980
21st to endNight
29%5%16%19%18%13%
1980
October1st to 10thNight
20%5%11%27%23%13%
1980
11th to 20thNight
31%49%18%21%18%
2136
21st to endNight
30%26%18%22%23%
2376
November1st to 10thNight
31%5%9%20%21%14%
2220
11th to 20thNight
33%49%20%20%14%
2322
21st to endNight
40%38%18%17%14%
2470
December1st to 10thNight
40%47%21%18%11%
2470
11th to 20thNight
42%36%12%22%15%
3037
21st to endNight
37%35%15%29%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
22%11%35%23%7%1
270
11th to 20thDay
24%10%28%29%7%2
249
21st to endDay
19%16%38%19%8%
264
February1st to 10thDay
32%12%27%21%8%1
240
11th to 20thDay
30%18%30%16%5%
240
21st to endDay
30%19%33%16%31
198
March1st to 10thDay
26%15%33%19%5%1
240
11th to 20thDay
21%15%36%20%7%1
240
21st to endDay
20%14%38%18%9%
264
April1st to 10thDay
23%12%37%23%5%1
240
11th to 20thDay
21%15%30%23%9%1
252
21st to endDay
20%11%35%25%9%1
499
May1st to 10thDay
16%10%34%30%10%
603
11th to 20thDay
16%8%24%34%16%3
625
21st to endDay
13%7%23%34%20%3
679
June1st to 10thDay
7%212%38%32%10%
630
11th to 20thDay
7%212%44%28%7%
630
21st to endDay
6%310%34%32%15%
630
July1st to 10thDay
8%37%30%38%15%
621
11th to 20thDay
31428%50%15%
618
21st to endDay
31427%50%15%
684
August1st to 10thDay
31425%49%18%
626
11th to 20thDay
5%2323%50%16%
539
21st to endDay
8%2421%30%35%
343
September1st to 10thDay
6%224%41%27%
270
11th to 20thDay
426%24%43%21%
270
21st to endDay
12%1425%40%17%
270
October1st to 10thDay
4113%30%40%13%
270
11th to 20thDay
14%419%30%27%6%
270
21st to endDay
22%10%24%21%18%5%
297
November1st to 10thDay
19%5%21%33%17%6%
270
11th to 20thDay
20%7%23%30%15%4
270
21st to endDay
26%12%31%21%8%2
270
December1st to 10thDay
19%7%34%22%13%5%
270
11th to 20thDay
27%13%27%24%8%
270
21st to endDay
23%10%36%20%8%2
297
January1st to 10thNight
21%10%29%31%8%
950
11th to 20thNight
23%11%27%31%8%
918
21st to endNight
21%9%32%31%7%
950
February1st to 10thNight
24%12%30%29%5%
720
11th to 20thNight
25%10%34%26%4
704
21st to endNight
27%12%39%19%2
561
March1st to 10thNight
21%11%40%25%4
540
11th to 20thNight
20%10%36%31%4
540
21st to endNight
16%11%41%27%41
594
April1st to 10thNight
14%11%43%29%3
540
11th to 20thNight
18%9%42%25%6%
533
21st to endNight
15%11%41%24%8%1
540
May1st to 10thNight
14%8%44%28%5%
540
11th to 20thNight
12%6%35%35%11%1
531
21st to endNight
11%430%40%15%
584
June1st to 10thNight
4216%49%27%1
540
11th to 20thNight
4225%51%16%1
540
21st to endNight
4314%46%29%5%
540
July1st to 10thNight
6%19%49%31%4
525
11th to 20thNight
3110%48%35%3
522
21st to endNight
417%52%34%3
591
August1st to 10thNight
16%58%31%4
537
11th to 20thNight
5%15%52%31%5%
534
21st to endNight
5%15%39%44%6%
594
September1st to 10thNight
8%25%40%40%5%
540
11th to 20thNight
10%27%36%41%5%
540
21st to endNight
10%212%35%37%4
540
October1st to 10thNight
5%112%48%29%5%
540
11th to 20thNight
14%420%41%19%2
696
21st to endNight
14%7%26%32%19%2
792
November1st to 10thNight
12%324%39%21%1
740
11th to 20thNight
14%7%25%38%15%1
802
21st to endNight
20%10%27%30%13%1
950
December1st to 10thNight
20%7%28%32%13%1
950
11th to 20thNight
24%10%27%31%8%1
950
21st to endNight
20%10%30%33%7%
1045
Page generated at 2024-01-11 03:22:39. Version ac07

Copyright 2024 Attilla Danko


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