Lufkin
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lufkin 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%
23831
24%
74211
17%
23772
55%
23772
30%
44225

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
32%
950
27%
2458
10%
946
43%
946
30%
1580
January11th to 20thNight
30%
920
25%
2392
9%
920
40%
920
28%
1579
January21st to endNight
29%
990
27%
2574
9%
990
39%
990
28%
1708
February1st to 10thNight
27%
900
23%
2340
6%
900
37%
900
26%
1565
February11th to 20thNight
24%
695
19%
2089
8%
691
33%
691
21%
1392
February21st to endNight
21%
444
26%
1628
9%
444
39%
444
19%
1024
March1st to 10thNight
29%
540
23%
1980
12%
540
43%
540
20%
1243
March11th to 20thNight
30%
540
21%
1980
12%
540
41%
540
19%
1234
March21st to endNight
31%
594
23%
2178
14%
594
44%
594
24%
1274
April1st to 10thNight
31%
540
24%
1958
15%
540
44%
540
24%
1167
April11th to 20thNight
34%
533
23%
1775
14%
533
47%
533
25%
1081
April21st to endNight
36%
540
25%
1800
17%
540
50%
540
29%
1038
May1st to 10thNight
35%
540
21%
1763
16%
540
45%
540
26%
1064
May11th to 20thNight
45%
531
24%
1594
20%
531
54%
531
35%
941
May21st to endNight
57%
584
23%
1745
20%
582
65%
582
35%
1018
June1st to 10thNight
72%
540
20%
1620
21%
540
76%
540
39%
908
June11th to 20thNight
72%
540
22%
1620
23%
540
76%
540
47%
836
June21st to endNight
69%
540
21%
1620
23%
540
71%
540
34%
951
July1st to 10thNight
71%
525
16%
1575
18%
525
73%
525
33%
960
July11th to 20thNight
81%
522
21%
1566
24%
522
84%
522
46%
832
July21st to endNight
81%
591
18%
1673
22%
558
82%
558
39%
949
August1st to 10thNight
86%
537
27%
1601
31%
534
87%
534
54%
766
August11th to 20thNight
80%
534
23%
1699
25%
534
81%
534
37%
941
August21st to endNight
73%
594
18%
1980
20%
594
74%
594
28%
1200
September1st to 10thNight
73%
540
23%
1894
26%
540
75%
540
33%
1051
September11th to 20thNight
68%
540
21%
1980
24%
540
69%
540
27%
1161
September21st to endNight
72%
540
30%
1980
32%
540
75%
540
35%
1003
October1st to 10thNight
72%
678
32%
2118
27%
678
75%
678
43%
1087
October11th to 20thNight
57%
720
34%
2160
23%
720
65%
720
38%
1194
October21st to endNight
49%
792
34%
2376
23%
792
58%
792
37%
1334
November1st to 10thNight
53%
740
28%
2220
20%
740
59%
740
36%
1268
November11th to 20thNight
46%
760
29%
2280
20%
760
54%
760
33%
1332
November21st to endNight
39%
820
28%
2340
17%
820
47%
820
29%
1479
December1st to 10thNight
36%
950
26%
2470
12%
950
45%
950
28%
1655
December11th to 20thNight
30%
948
25%
2872
11%
948
37%
948
22%
1890
December21st to endNight
32%
1039
15%
4313
11%
1026
39%
1026
19%
2520

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%6%8%43%
74990
Night
12%5%2443445%7%49%
74801
TransparencyDay
39%6%11%19%18%6%
74715
Night
35%5%11%20%20%9%
74596
SeeingDay
14%8%22%26%23%7%
13879
Night
15%7%24%33%18%2
23839

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
18%7%245%235%45%44%
1707
11th to 20thDay
20%7%34423345%46%
1647
21st to endDay
20%7%33423336%46%
1782
February1st to 10thDay
21%8%37%5%3443439%
1620
11th to 20thDay
24%8%245%34345%39%
1774
21st to endDay
23%7%46%433435%39%
1628
March1st to 10thDay
21%7%36%5%34447%37%
1980
11th to 20thDay
18%7%345%445%5%6%39%
1980
21st to endDay
15%7%35%6%34446%42%
2178
April1st to 10thDay
14%7%46%6%345%5%6%40%
2000
11th to 20thDay
15%7%36%5%35%5%5%7%40%
2134
21st to endDay
12%6%25%7%3445%6%46%
2160
May1st to 10thDay
12%7%35%7%45%5%6%8%39%
2192
11th to 20thDay
12%5%35%6%45%5%6%8%41%
2302
21st to endDay
10%5%36%7%46%7%8%12%33%
2531
June1st to 10thDay
6%435%7%46%6%8%11%39%
2340
11th to 20thDay
6%325%6%47%7%8%11%42%
2340
21st to endDay
6%6%26%6%5%7%7%8%11%36%
2340
July1st to 10thDay
9%5%35%7%5%7%7%8%10%34%
2340
11th to 20thDay
5%425%5%46%8%8%11%41%
2340
21st to endDay
6%336%6%46%6%8%10%41%
2546
August1st to 10thDay
43145%46%5%7%12%50%
2328
11th to 20thDay
6%425%5%46%6%9%11%43%
2199
21st to endDay
8%426%7%5%7%7%7%10%36%
2376
September1st to 10thDay
6%5%36%6%46%6%7%8%44%
2062
11th to 20thDay
13%5%26%6%35%5%6%8%40%
1980
21st to endDay
8%4244345%8%8%50%
1980
October1st to 10thDay
7%424434346%59%
1823
11th to 20thDay
12%6%24334446%54%
1800
21st to endDay
15%6%24323345%53%
1980
November1st to 10thDay
11%6%345%35%46%7%48%
1858
11th to 20thDay
12%6%345%24346%51%
1900
21st to endDay
18%6%35%5%33445%44%
1837
December1st to 10thDay
17%6%36%425%445%44%
1710
11th to 20thDay
18%7%345%44445%42%
2161
21st to endDay
16%10%47%423435%42%
3135
January1st to 10thNight
17%7%24423346%47%
2458
11th to 20thNight
19%6%25%423335%47%
2392
21st to endNight
19%8%35%323345%46%
2574
February1st to 10thNight
17%8%34424446%44%
2340
11th to 20thNight
21%7%35%42432444%
2089
21st to endNight
22%6%34424446%42%
1628
March1st to 10thNight
19%8%25%5%33446%43%
1980
11th to 20thNight
15%7%26%5%35%45%7%42%
1980
21st to endNight
14%6%25%42435%5%48%
2178
April1st to 10thNight
11%6%36%5%35%45%7%45%
1958
11th to 20thNight
13%5%35%5%4445%7%45%
1775
21st to endNight
11%7%25%434447%50%
1800
May1st to 10thNight
10%6%345%3446%9%45%
1763
11th to 20thNight
12%5%2443345%7%51%
1593
21st to endNight
8%425%5%345%7%10%48%
1745
June1st to 10thNight
6%414425%5%7%12%51%
1620
11th to 20thNight
221332347%13%58%
1620
21st to endNight
7%425%5%25%5%7%11%47%
1620
July1st to 10thNight
6%325%6%45%5%8%13%43%
1620
11th to 20thNight
33133345%7%11%57%
1620
21st to endNight
3224436%6%8%13%50%
1772
August1st to 10thNight
221322346%13%63%
1611
11th to 20thNight
5%323435%6%8%12%49%
1699
21st to endNight
6%426%6%36%7%7%10%43%
1980
September1st to 10thNight
5%5%36%435%5%5%7%53%
1894
11th to 20thNight
11%7%26%5%245%5%8%47%
1980
21st to endNight
7%4243245%7%7%55%
1980
October1st to 10thNight
5%323335%5%47%61%
2118
11th to 20thNight
10%6%2332345%5%58%
2160
21st to endNight
13%423323345%58%
2376
November1st to 10thNight
12%5%24423346%55%
2220
11th to 20thNight
11%6%25%433446%53%
2280
21st to endNight
17%6%25%42345%6%46%
2340
December1st to 10thNight
18%7%25%424445%45%
2470
11th to 20thNight
17%8%35%5%33435%45%
3036
21st to endNight
17%7%24433445%47%
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
42%46%17%23%8%
1708
11th to 20thDay
42%3418%24%8%
1647
21st to endDay
43%3415%24%11%
1782
February1st to 10thDay
51%35%13%18%10%
1620
11th to 20thDay
51%35%15%18%8%
1784
21st to endDay
49%46%12%17%12%
1628
March1st to 10thDay
49%47%13%19%7%
1980
11th to 20thDay
45%5%8%15%20%7%
1980
21st to endDay
43%5%8%15%23%6%
2178
April1st to 10thDay
44%6%8%19%17%7%
2000
11th to 20thDay
43%5%11%16%16%9%
2134
21st to endDay
39%5%9%19%24%5%
2160
May1st to 10thDay
43%6%11%18%16%6%
2192
11th to 20thDay
40%6%12%22%17%2
2306
21st to endDay
42%9%14%20%14%1
2531
June1st to 10thDay
36%10%16%24%14%1
2340
11th to 20thDay
33%9%14%26%16%2
2340
21st to endDay
40%9%14%22%13%2
2340
July1st to 10thDay
42%9%19%22%7%
2276
11th to 20thDay
33%9%19%26%12%
2271
21st to endDay
34%11%19%27%9%
2405
August1st to 10thDay
25%9%19%32%13%1
2314
11th to 20thDay
31%10%22%24%12%2
2199
21st to endDay
40%10%16%20%11%2
2376
September1st to 10thDay
35%8%14%20%15%8%
2062
11th to 20thDay
40%7%13%16%17%7%
1980
21st to endDay
30%6%12%22%20%12%
1980
October1st to 10thDay
26%410%22%24%13%
1823
11th to 20thDay
33%46%17%25%15%
1800
21st to endDay
34%45%14%29%15%
1980
November1st to 10thDay
36%5%8%19%22%10%
1858
11th to 20thDay
36%46%19%24%11%
1900
21st to endDay
43%5%6%18%20%8%
1837
December1st to 10thDay
43%311%16%19%8%
1710
11th to 20thDay
45%45%15%22%8%
2159
21st to endDay
47%35%13%25%8%
3135
January1st to 10thNight
39%35%19%22%11%
2458
11th to 20thNight
41%37%17%22%10%
2392
21st to endNight
43%3414%22%14%
2574
February1st to 10thNight
42%46%16%18%14%
2340
11th to 20thNight
47%45%14%20%10%
2089
21st to endNight
44%48%13%16%15%
1628
March1st to 10thNight
44%48%14%19%11%
1980
11th to 20thNight
43%5%9%14%21%8%
1980
21st to endNight
38%5%10%16%23%8%
2178
April1st to 10thNight
38%5%9%20%17%11%
1958
11th to 20thNight
38%6%10%19%16%12%
1775
21st to endNight
35%5%9%19%25%7%
1800
May1st to 10thNight
37%6%11%18%20%7%
1763
11th to 20thNight
34%412%25%21%3
1594
21st to endNight
30%7%18%27%16%1
1746
June1st to 10thNight
26%8%19%29%17%1
1620
11th to 20thNight
19%8%18%33%18%3
1620
21st to endNight
30%9%15%29%16%1
1620
July1st to 10thNight
30%10%24%25%9%1
1575
11th to 20thNight
20%8%29%29%13%1
1566
21st to endNight
23%11%28%25%12%1
1673
August1st to 10thNight
14%7%27%35%15%2
1601
11th to 20thNight
25%9%23%27%13%2
1699
21st to endNight
32%11%20%22%11%4
1980
September1st to 10thNight
30%7%17%21%17%8%
1894
11th to 20thNight
36%6%14%20%16%7%
1980
21st to endNight
26%7%11%22%23%12%
1980
October1st to 10thNight
23%6%9%25%21%16%
2118
11th to 20thNight
29%46%18%26%16%
2160
21st to endNight
30%46%16%27%18%
2376
November1st to 10thNight
31%410%19%24%12%
2220
11th to 20thNight
34%37%19%24%13%
2280
21st to endNight
40%47%17%22%11%
2340
December1st to 10thNight
42%49%18%19%9%
2470
11th to 20thNight
44%35%13%22%13%
3037
21st to endNight
40%46%14%29%7%
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
24%16%39%16%6%
270
11th to 20thDay
29%12%35%20%41
249
21st to endDay
26%20%34%16%3
264
February1st to 10thDay
29%19%33%16%3
240
11th to 20thDay
37%16%33%14%
240
21st to endDay
28%23%38%11%1
198
March1st to 10thDay
25%21%36%14%4
240
11th to 20thDay
22%22%38%15%21
240
21st to endDay
21%14%44%18%21
264
April1st to 10thDay
20%16%40%20%3
260
11th to 20thDay
25%14%27%23%12%
412
21st to endDay
16%12%36%26%7%2
420
May1st to 10thDay
16%11%34%30%9%
455
11th to 20thDay
15%7%26%32%18%2
625
21st to endDay
11%7%25%33%19%6%
679
June1st to 10thDay
7%116%36%31%10%
630
11th to 20thDay
5%117%40%30%7%
630
21st to endDay
8%313%29%35%11%
630
July1st to 10thDay
8%29%28%39%14%
621
11th to 20thDay
416%29%46%14%
618
21st to endDay
416%29%44%16%
684
August1st to 10thDay
415%27%46%17%
626
11th to 20thDay
7%1326%45%18%
513
21st to endDay
11%35%18%39%23%
495
September1st to 10thDay
427%27%43%18%
352
11th to 20thDay
9%313%31%34%10%
270
21st to endDay
11%410%35%32%9%
270
October1st to 10thDay
7%323%38%23%6%
270
11th to 20thDay
11%7%29%31%16%5%
270
21st to endDay
25%10%30%19%12%4
297
November1st to 10thDay
13%8%29%34%13%3
270
11th to 20thDay
19%9%36%26%9%1
270
21st to endDay
21%18%36%19%5%2
270
December1st to 10thDay
19%12%36%21%10%3
270
11th to 20thDay
26%15%34%19%6%
270
21st to endDay
24%17%35%19%42
297
January1st to 10thNight
21%11%32%29%7%
950
11th to 20thNight
24%14%28%27%7%
920
21st to endNight
24%10%33%30%4
990
February1st to 10thNight
22%12%35%27%4
900
11th to 20thNight
28%13%33%23%4
695
21st to endNight
28%12%36%21%2
444
March1st to 10thNight
24%12%33%27%5%
540
11th to 20thNight
18%14%34%29%5%1
540
21st to endNight
17%11%37%28%7%
594
April1st to 10thNight
14%11%42%27%7%
540
11th to 20thNight
16%13%33%28%10%
533
21st to endNight
15%10%37%28%10%
540
May1st to 10thNight
13%7%39%31%9%1
540
11th to 20thNight
14%5%31%31%17%1
531
21st to endNight
9%425%39%22%2
584
June1st to 10thNight
7%111%43%33%4
540
11th to 20thNight
2219%48%26%4
540
21st to endNight
7%311%43%31%6%
540
July1st to 10thNight
6%28%39%38%7%
525
11th to 20thNight
419%39%40%7%
522
21st to endNight
416%39%43%6%
591
August1st to 10thNight
215%45%41%6%
537
11th to 20thNight
6%1442%42%5%
534
21st to endNight
8%16%34%43%8%
594
September1st to 10thNight
6%26%34%45%7%
540
11th to 20thNight
14%27%30%40%7%
540
21st to endNight
8%212%34%37%7%
540
October1st to 10thNight
6%213%38%35%5%
678
11th to 20thNight
14%6%20%39%19%3
720
21st to endNight
16%6%26%30%20%2
792
November1st to 10thNight
13%424%36%21%2
740
11th to 20thNight
14%10%25%38%14%
760
21st to endNight
21%10%27%28%14%
820
December1st to 10thNight
22%11%27%28%11%1
950
11th to 20thNight
25%10%29%30%5%
950
21st to endNight
24%9%29%30%7%
1045
Page generated at 2024-01-11 12:32:03. Version ac07

Copyright 2024 Attilla Danko


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