Catahoula Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Catahoula Lake clear sky chart from 2005-11-06 to 2024-01-16.

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
47%
23765
23%
74177
17%
23704
54%
23704
29%
44626

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
25%
950
25%
2458
8%
946
37%
946
27%
1618
January11th to 20thNight
29%
930
26%
2418
9%
930
39%
930
27%
1591
January21st to endNight
25%
990
24%
2574
8%
990
35%
990
27%
1731
February1st to 10thNight
27%
830
22%
2270
9%
830
36%
830
26%
1503
February11th to 20thNight
26%
703
20%
2099
9%
700
34%
700
23%
1380
February21st to endNight
19%
527
21%
1711
7%
527
32%
527
18%
1174
March1st to 10thNight
30%
540
24%
1980
14%
540
43%
540
22%
1209
March11th to 20thNight
26%
540
20%
1980
11%
540
38%
540
20%
1234
March21st to endNight
32%
594
23%
2178
15%
594
45%
594
27%
1246
April1st to 10thNight
31%
540
26%
1805
14%
540
46%
540
27%
1072
April11th to 20thNight
32%
533
24%
1775
15%
533
46%
533
26%
1069
April21st to endNight
41%
540
28%
1800
19%
540
57%
540
33%
997
May1st to 10thNight
43%
540
21%
1800
16%
540
54%
540
31%
1018
May11th to 20thNight
48%
531
21%
1770
20%
531
55%
531
34%
994
May21st to endNight
60%
584
23%
1802
22%
582
65%
582
34%
1059
June1st to 10thNight
67%
540
17%
1620
18%
540
69%
540
32%
980
June11th to 20thNight
72%
540
20%
1620
20%
540
76%
540
44%
872
June21st to endNight
72%
540
20%
1620
21%
540
74%
540
33%
968
July1st to 10thNight
75%
525
13%
1575
15%
525
75%
525
31%
965
July11th to 20thNight
77%
522
18%
1566
19%
522
80%
522
37%
910
July21st to endNight
77%
591
18%
1673
20%
558
78%
558
38%
954
August1st to 10thNight
83%
537
17%
1721
20%
534
84%
534
41%
901
August11th to 20thNight
79%
534
19%
1776
22%
534
80%
534
30%
1046
August21st to endNight
69%
594
17%
1980
19%
594
70%
594
25%
1260
September1st to 10thNight
73%
540
23%
1800
26%
540
74%
540
30%
1072
September11th to 20thNight
67%
540
24%
1800
24%
540
69%
540
28%
1089
September21st to endNight
68%
644
31%
2036
29%
644
71%
644
37%
1122
October1st to 10thNight
66%
720
29%
2160
23%
720
69%
720
41%
1162
October11th to 20thNight
53%
720
34%
2160
24%
720
62%
720
39%
1195
October21st to endNight
50%
792
33%
2376
24%
792
58%
792
37%
1335
November1st to 10thNight
52%
740
32%
2220
23%
740
61%
740
39%
1243
November11th to 20thNight
43%
760
31%
2280
20%
760
53%
760
35%
1290
November21st to endNight
38%
760
28%
2280
18%
760
48%
760
29%
1417
December1st to 10thNight
37%
764
28%
2284
16%
764
47%
764
27%
1440
December11th to 20thNight
31%
949
24%
2888
10%
948
38%
948
22%
1889
December21st to endNight
27%
1041
14%
4322
9%
1026
35%
1026
16%
2621

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%42%
75087
Night
12%6%25%43445%7%47%
74741
TransparencyDay
41%5%11%19%18%6%
74812
Night
36%5%11%19%20%8%
74537
SeeingDay
14%8%20%25%23%10%
13891
Night
15%8%25%30%19%3
23770

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
20%6%245%33447%44%
1707
11th to 20thDay
17%8%46%42344444%
1670
21st to endDay
20%8%245%24436%42%
1782
February1st to 10thDay
20%9%35%5%3434440%
1688
11th to 20thDay
20%8%36%5%2335%5%39%
1748
21st to endDay
20%10%37%5%2345%5%35%
1560
March1st to 10thDay
19%8%35%5%3445%6%38%
1980
11th to 20thDay
14%8%47%7%35%45%7%37%
1980
21st to endDay
12%6%36%6%3446%7%44%
2178
April1st to 10thDay
11%7%26%6%35%5%5%7%44%
2155
11th to 20thDay
15%7%36%6%34447%40%
2134
21st to endDay
12%6%26%5%36%5%6%6%42%
2160
May1st to 10thDay
11%7%36%6%345%5%8%41%
2160
11th to 20thDay
10%5%36%6%45%6%6%7%42%
2124
21st to endDay
8%5%26%6%48%6%7%9%39%
2469
June1st to 10thDay
8%5%36%6%5%7%7%7%11%35%
2340
11th to 20thDay
5%5%35%6%47%8%8%9%40%
2340
21st to endDay
8%426%7%5%7%7%8%11%35%
2340
July1st to 10thDay
7%5%36%8%5%8%7%7%11%33%
2340
11th to 20thDay
7%436%6%47%8%9%10%35%
2340
21st to endDay
8%5%26%7%47%9%8%10%34%
2546
August1st to 10thDay
6%425%6%47%6%7%11%43%
2202
11th to 20thDay
8%5%36%6%46%6%7%11%38%
2125
21st to endDay
13%5%35%6%46%7%7%10%35%
2376
September1st to 10thDay
9%5%26%6%47%5%6%9%40%
2160
11th to 20thDay
13%6%25%5%36%5%5%7%43%
2160
21st to endDay
11%424434347%53%
1898
October1st to 10thDay
7%4245%3435%6%58%
1800
11th to 20thDay
10%425%33345%6%56%
1800
21st to endDay
13%5%25%423346%54%
1980
November1st to 10thDay
10%6%25%324446%54%
1858
11th to 20thDay
12%5%35%424445%53%
1900
21st to endDay
15%7%26%5%4435%6%43%
1900
December1st to 10thDay
18%8%25%43445%6%43%
1891
11th to 20thDay
15%10%36%5%24447%39%
2161
21st to endDay
17%9%35%42435%5%43%
3135
January1st to 10thNight
18%6%25%423346%46%
2458
11th to 20thNight
18%7%35%423446%44%
2418
21st to endNight
19%8%35%423435%44%
2574
February1st to 10thNight
17%7%345%33446%43%
2270
11th to 20thNight
22%8%24423335%44%
2098
21st to endNight
23%8%36%434346%36%
1711
March1st to 10thNight
16%7%25%5%34447%44%
1980
11th to 20thNight
15%7%35%5%34447%41%
1980
21st to endNight
13%6%25%5%24346%49%
2178
April1st to 10thNight
12%5%25%5%25%5%6%7%48%
1805
11th to 20thNight
15%6%345%3446%7%46%
1775
21st to endNight
9%435%5%2445%8%52%
1800
May1st to 10thNight
9%5%245%345%6%9%48%
1800
11th to 20thNight
9%5%24435%36%9%49%
1769
21st to endNight
8%435%5%45%46%9%48%
1802
June1st to 10thNight
6%5%25%5%35%6%7%9%46%
1620
11th to 20thNight
42245%35%5%7%11%54%
1620
21st to endNight
6%434435%7%8%11%46%
1620
July1st to 10thNight
6%5%35%5%36%7%9%12%41%
1620
11th to 20thNight
6%4233345%7%12%50%
1620
21st to endNight
5%325%5%345%7%12%49%
1772
August1st to 10thNight
3213435%6%8%13%53%
1731
11th to 20thNight
4325%6%46%5%8%13%44%
1776
21st to endNight
9%426%6%36%6%8%10%40%
1980
September1st to 10thNight
7%5%25%5%446%7%8%46%
1800
11th to 20thNight
9%6%346%35%6%6%7%45%
1800
21st to endNight
9%5%2443446%6%55%
2036
October1st to 10thNight
6%41443445%6%58%
2160
11th to 20thNight
10%5%24323346%57%
2160
21st to endNight
12%5%23324445%56%
2376
November1st to 10thNight
11%5%14423347%56%
2220
11th to 20thNight
13%424423346%55%
2280
21st to endNight
15%6%25%43445%5%47%
2280
December1st to 10thNight
18%6%35%424346%46%
2284
11th to 20thNight
15%8%27%5%34345%43%
3036
21st to endNight
17%10%35%423346%43%
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
43%35%21%21%7%
1708
11th to 20thDay
44%25%16%24%8%
1670
21st to endDay
46%25%15%22%10%
1782
February1st to 10thDay
50%36%14%18%10%
1688
11th to 20thDay
49%45%16%18%9%
1758
21st to endDay
52%46%12%16%10%
1560
March1st to 10thDay
48%48%14%17%9%
1980
11th to 20thDay
48%49%13%21%5%
1980
21st to endDay
40%49%19%23%5%
2178
April1st to 10thDay
41%49%22%17%7%
2155
11th to 20thDay
45%47%18%18%8%
2134
21st to endDay
39%6%8%21%22%4
2160
May1st to 10thDay
41%5%12%19%18%6%
2160
11th to 20thDay
40%5%14%23%16%2
2128
21st to endDay
39%7%13%27%14%1
2469
June1st to 10thDay
41%7%15%22%12%2
2340
11th to 20thDay
36%8%15%24%16%1
2340
21st to endDay
41%10%16%21%12%1
2340
July1st to 10thDay
42%9%21%18%8%1
2276
11th to 20thDay
39%10%21%22%7%1
2271
21st to endDay
40%9%20%22%7%1
2405
August1st to 10thDay
34%8%21%26%10%
2188
11th to 20thDay
37%9%19%24%9%2
2125
21st to endDay
42%10%17%16%11%3
2376
September1st to 10thDay
39%7%14%20%15%5%
2160
11th to 20thDay
39%6%14%17%18%6%
2160
21st to endDay
34%49%23%21%9%
1898
October1st to 10thDay
27%49%21%23%15%
1800
11th to 20thDay
31%35%18%29%14%
1800
21st to endDay
33%36%17%29%13%
1980
November1st to 10thDay
33%36%19%29%10%
1858
11th to 20thDay
35%37%16%27%12%
1900
21st to endDay
43%37%19%21%8%
1900
December1st to 10thDay
44%311%19%17%8%
1891
11th to 20thDay
47%36%14%24%6%
2159
21st to endDay
45%26%17%27%4
3135
January1st to 10thNight
41%35%17%25%8%
2458
11th to 20thNight
41%36%18%22%10%
2418
21st to endNight
44%36%15%23%9%
2574
February1st to 10thNight
43%37%17%20%10%
2270
11th to 20thNight
45%36%16%20%11%
2099
21st to endNight
51%46%12%14%13%
1711
March1st to 10thNight
42%47%14%22%11%
1980
11th to 20thNight
44%411%14%19%8%
1980
21st to endNight
37%311%18%24%6%
2178
April1st to 10thNight
35%6%10%20%18%10%
1805
11th to 20thNight
38%49%18%18%12%
1775
21st to endNight
32%5%9%24%25%6%
1800
May1st to 10thNight
33%5%12%23%18%9%
1800
11th to 20thNight
32%5%14%24%22%3
1770
21st to endNight
32%6%15%27%19%1
1803
June1st to 10thNight
33%8%18%23%17%1
1620
11th to 20thNight
23%6%21%31%17%3
1620
21st to endNight
30%9%18%27%14%1
1620
July1st to 10thNight
31%11%28%19%10%1
1575
11th to 20thNight
24%12%29%23%10%1
1566
21st to endNight
26%9%27%26%10%2
1673
August1st to 10thNight
21%9%28%28%12%1
1721
11th to 20thNight
30%10%22%24%11%2
1776
21st to endNight
37%10%19%18%12%3
1980
September1st to 10thNight
33%8%16%22%14%7%
1800
11th to 20thNight
36%7%15%17%18%8%
1800
21st to endNight
29%5%9%23%21%13%
2036
October1st to 10thNight
26%5%9%21%24%15%
2160
11th to 20thNight
29%46%18%29%15%
2160
21st to endNight
31%36%16%24%18%
2376
November1st to 10thNight
30%38%18%27%14%
2220
11th to 20thNight
32%38%17%27%14%
2280
21st to endNight
39%37%16%24%10%
2280
December1st to 10thNight
42%39%19%20%7%
2284
11th to 20thNight
44%36%12%24%11%
3037
21st to endNight
44%35%20%22%6%
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
25%19%35%16%5%
270
11th to 20thDay
23%21%33%16%5%1
257
21st to endDay
29%18%32%16%4
264
February1st to 10thDay
25%20%30%18%7%1
240
11th to 20thDay
35%18%34%10%3
240
21st to endDay
28%27%33%11%1
198
March1st to 10thDay
24%16%35%20%5%
240
11th to 20thDay
21%23%35%16%5%
240
21st to endDay
17%20%34%21%6%
264
April1st to 10thDay
17%17%34%24%8%
415
11th to 20thDay
21%17%30%18%13%2
412
21st to endDay
15%14%28%29%14%
420
May1st to 10thDay
17%9%29%28%14%3
423
11th to 20thDay
13%422%33%20%8%
447
21st to endDay
10%5%20%35%23%7%
617
June1st to 10thDay
10%312%33%31%10%
630
11th to 20thDay
7%215%36%30%10%
630
21st to endDay
9%311%27%32%18%
630
July1st to 10thDay
7%26%25%39%20%
621
11th to 20thDay
6%16%23%41%24%
618
21st to endDay
7%28%26%39%19%
684
August1st to 10thDay
6%1423%39%26%
500
11th to 20thDay
7%1417%45%25%
439
21st to endDay
13%27%16%36%25%
495
September1st to 10thDay
7%17%26%37%22%
450
11th to 20thDay
12%210%22%34%19%
450
21st to endDay
12%212%28%29%16%
313
October1st to 10thDay
6%422%36%27%6%
270
11th to 20thDay
10%8%24%30%21%7%
270
21st to endDay
19%10%27%24%15%4
297
November1st to 10thDay
14%10%26%33%15%3
270
11th to 20thDay
17%13%29%26%13%2
270
21st to endDay
19%19%30%20%11%2
270
December1st to 10thDay
19%13%37%18%12%1
270
11th to 20thDay
25%12%37%18%7%
270
21st to endDay
23%18%33%19%6%1
297
January1st to 10thNight
23%14%35%23%6%
950
11th to 20thNight
22%13%32%26%8%
930
21st to endNight
23%13%36%23%5%
990
February1st to 10thNight
21%14%34%26%5%
830
11th to 20thNight
26%14%30%25%4
703
21st to endNight
27%17%35%19%3
527
March1st to 10thNight
20%12%34%28%6%
540
11th to 20thNight
17%14%39%23%6%1
540
21st to endNight
18%9%38%26%8%
594
April1st to 10thNight
15%12%39%27%6%1
540
11th to 20thNight
18%13%34%25%11%
533
21st to endNight
9%9%37%33%12%1
540
May1st to 10thNight
11%8%34%34%13%1
540
11th to 20thNight
10%433%33%19%1
531
21st to endNight
7%421%40%23%4
584
June1st to 10thNight
8%112%42%33%4
540
11th to 20thNight
4114%44%32%5%
540
21st to endNight
9%19%35%33%12%
540
July1st to 10thNight
5%26%32%46%9%
525
11th to 20thNight
5%17%33%40%14%
522
21st to endNight
5%16%37%41%11%
591
August1st to 10thNight
415%32%44%13%
537
11th to 20thNight
5%1432%45%13%
534
21st to endNight
10%26%28%40%13%
594
September1st to 10thNight
8%27%34%42%7%
540
11th to 20thNight
12%29%27%42%8%
540
21st to endNight
11%211%34%37%5%
644
October1st to 10thNight
8%218%34%34%4
720
11th to 20thNight
12%5%25%33%22%3
720
21st to endNight
15%7%24%33%19%3
792
November1st to 10thNight
12%5%25%35%21%2
740
11th to 20thNight
15%9%29%32%14%
760
21st to endNight
18%10%31%27%13%1
760
December1st to 10thNight
21%12%28%30%9%
764
11th to 20thNight
23%10%30%28%9%
950
21st to endNight
24%13%31%25%6%
1045
Page generated at 2024-01-13 18:28:33. Version ac07

Copyright 2024 Attilla Danko


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