Abita Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Abita Springs clear sky chart from 2005-11-06 to 2024-01-10.

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
54%
23274
22%
74488
18%
23217
60%
23217
29%
44749

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
35%
945
25%
2453
10%
941
46%
941
31%
1580
January11th to 20thNight
38%
855
25%
2295
12%
855
46%
855
30%
1470
January21st to endNight
32%
792
27%
2376
13%
792
43%
792
24%
1527
February1st to 10thNight
31%
720
23%
2160
11%
720
41%
720
26%
1382
February11th to 20thNight
34%
703
21%
2099
9%
700
43%
700
25%
1359
February21st to endNight
24%
592
20%
1776
8%
592
33%
592
22%
1196
March1st to 10thNight
34%
662
24%
2102
14%
662
43%
662
27%
1299
March11th to 20thNight
40%
540
20%
1980
14%
540
48%
540
22%
1221
March21st to endNight
43%
594
27%
2066
19%
594
55%
594
30%
1140
April1st to 10thNight
42%
540
25%
1800
18%
540
51%
540
25%
1091
April11th to 20thNight
41%
533
24%
1775
17%
533
53%
533
26%
1081
April21st to endNight
56%
540
30%
1800
27%
540
65%
540
39%
919
May1st to 10thNight
59%
540
26%
1800
25%
540
66%
540
38%
937
May11th to 20thNight
65%
531
19%
1770
21%
531
68%
531
32%
1026
May21st to endNight
71%
584
20%
1938
22%
582
74%
582
33%
1088
June1st to 10thNight
73%
540
15%
1800
18%
540
74%
540
29%
1079
June11th to 20thNight
80%
540
17%
1672
18%
540
81%
540
35%
962
June21st to endNight
71%
540
13%
1620
14%
540
71%
540
28%
1040
July1st to 10thNight
77%
525
11%
1575
12%
525
77%
525
27%
1020
July11th to 20thNight
80%
522
11%
1610
13%
522
80%
522
27%
1036
July21st to endNight
78%
591
13%
1858
17%
558
78%
558
29%
1127
August1st to 10thNight
85%
537
11%
1778
15%
534
85%
534
36%
997
August11th to 20thNight
81%
534
13%
1776
17%
534
81%
534
24%
1152
August21st to endNight
73%
594
14%
1980
17%
594
73%
594
24%
1273
September1st to 10thNight
73%
540
20%
1800
23%
540
73%
540
27%
1115
September11th to 20thNight
69%
581
24%
1841
23%
581
70%
581
29%
1111
September21st to endNight
69%
720
28%
1980
23%
720
70%
720
39%
1163
October1st to 10thNight
70%
720
30%
2038
25%
720
72%
720
45%
1110
October11th to 20thNight
63%
720
34%
2160
26%
720
70%
720
43%
1146
October21st to endNight
57%
792
33%
2376
28%
792
62%
792
38%
1307
November1st to 10thNight
61%
740
32%
2220
28%
740
66%
740
39%
1223
November11th to 20thNight
48%
760
31%
2377
23%
760
58%
760
35%
1304
November21st to endNight
45%
760
28%
2470
21%
760
55%
760
29%
1455
December1st to 10thNight
41%
760
26%
2470
18%
760
51%
760
27%
1497
December11th to 20thNight
38%
758
22%
2879
14%
758
46%
758
20%
1791
December21st to endNight
31%
829
14%
4018
11%
817
38%
817
13%
2525

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%6%36%6%46%6%6%8%40%
74633
Night
11%5%25%5%35%5%6%8%46%
75002
TransparencyDay
39%8%11%18%17%6%
74369
Night
35%7%13%20%18%8%
74786
SeeingDay
13%7%19%25%24%12%
13570
Night
13%6%20%30%24%7%
23283

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%6%26%5%345%5%6%42%
1698
11th to 20thDay
15%6%35%5%35%346%45%
1655
21st to endDay
19%5%35%5%24435%44%
1980
February1st to 10thDay
17%8%35%5%345%46%39%
1800
11th to 20thDay
17%7%35%433447%43%
1748
21st to endDay
17%8%38%6%3445%6%37%
1480
March1st to 10thDay
15%6%26%5%245%6%7%42%
1872
11th to 20thDay
13%7%46%6%35%46%7%38%
1980
21st to endDay
11%5%25%5%35%46%8%46%
2289
April1st to 10thDay
11%5%26%6%46%6%7%7%41%
2160
11th to 20thDay
15%5%27%5%346%5%9%40%
2134
21st to endDay
9%425%5%35%47%8%47%
2160
May1st to 10thDay
11%4245%35%5%6%8%46%
2160
11th to 20thDay
9%6%25%6%45%7%8%8%42%
2124
21st to endDay
6%5%35%6%37%7%9%11%37%
2337
June1st to 10thDay
9%6%26%8%5%8%7%8%11%31%
2160
11th to 20thDay
5%436%7%5%8%8%8%12%34%
2280
21st to endDay
7%6%36%8%6%8%9%9%11%27%
2340
July1st to 10thDay
9%7%38%8%6%8%8%9%11%25%
2340
11th to 20thDay
7%6%37%9%6%9%9%9%10%24%
2291
21st to endDay
8%6%37%7%6%8%9%8%11%27%
2350
August1st to 10thDay
5%437%7%49%8%8%11%33%
2148
11th to 20thDay
9%6%37%8%5%8%8%9%11%26%
2125
21st to endDay
11%6%36%7%48%7%8%9%31%
2376
September1st to 10thDay
9%5%36%7%5%7%7%8%10%34%
2160
11th to 20thDay
10%6%36%6%46%6%6%9%39%
2099
21st to endDay
8%435%5%45%6%7%7%46%
1980
October1st to 10thDay
6%424435%5%6%7%54%
1917
11th to 20thDay
6%425%5%35%5%5%7%54%
1800
21st to endDay
10%325%433446%56%
1980
November1st to 10thDay
8%4244345%5%6%54%
1858
11th to 20thDay
11%5%2343335%6%55%
1798
21st to endDay
13%5%26%5%2445%7%45%
1710
December1st to 10thDay
15%6%25%5%25%45%6%44%
1710
11th to 20thDay
15%8%36%5%345%5%6%39%
2162
21st to endDay
18%7%26%5%35%45%6%38%
3472
January1st to 10thNight
17%7%2432445%7%46%
2453
11th to 20thNight
16%6%34424446%47%
2295
21st to endNight
19%7%25%423445%44%
2376
February1st to 10thNight
18%6%35%424446%43%
2160
11th to 20thNight
18%7%25%42345%6%42%
2098
21st to endNight
20%8%36%43445%7%37%
1776
March1st to 10thNight
14%6%25%5%25%45%7%44%
2102
11th to 20thNight
13%6%35%5%35%45%8%41%
1980
21st to endNight
12%5%24424447%53%
2066
April1st to 10thNight
15%5%35%5%3335%6%47%
1800
11th to 20thNight
13%6%36%435%5%46%46%
1775
21st to endNight
6%4244245%5%9%56%
1800
May1st to 10thNight
9%325%43445%10%53%
1800
11th to 20thNight
6%5%35%5%35%5%6%8%49%
1769
21st to endNight
6%4245%25%6%8%11%48%
1938
June1st to 10thNight
8%5%25%5%36%6%8%11%42%
1800
11th to 20thNight
3314447%8%8%12%47%
1672
21st to endNight
6%5%26%6%47%7%7%10%40%
1620
July1st to 10thNight
5%5%35%6%46%7%7%13%40%
1620
11th to 20thNight
4425%5%37%7%11%14%38%
1664
21st to endNight
5%425%6%46%6%8%14%41%
1968
August1st to 10thNight
32136%45%6%9%13%47%
1790
11th to 20thNight
4325%6%47%8%9%14%37%
1776
21st to endNight
8%425%6%46%7%8%12%39%
1980
September1st to 10thNight
7%5%35%6%46%6%8%11%41%
1800
11th to 20thNight
8%5%26%5%35%6%7%9%45%
1841
21st to endNight
7%5%345%246%6%8%51%
1980
October1st to 10thNight
6%414434447%59%
2038
11th to 20thNight
6%42342435%7%60%
2160
21st to endNight
11%42442335%6%56%
2376
November1st to 10thNight
10%5%24424246%58%
2220
11th to 20thNight
11%414433447%55%
2377
21st to endNight
12%6%35%5%3436%7%47%
2470
December1st to 10thNight
15%7%26%5%23447%45%
2470
11th to 20thNight
13%8%346%35%5%5%5%42%
3012
21st to endNight
18%9%36%434435%40%
4180

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
41%5%7%17%22%9%
1699
11th to 20thDay
41%46%15%25%9%
1655
21st to endDay
43%45%17%20%11%
1980
February1st to 10thDay
45%48%13%19%10%
1800
11th to 20thDay
41%5%8%18%18%10%
1758
21st to endDay
48%5%8%14%17%9%
1480
March1st to 10thDay
40%5%8%20%18%7%
1872
11th to 20thDay
43%7%10%12%20%8%
1980
21st to endDay
36%6%12%20%20%6%
2289
April1st to 10thDay
38%8%10%17%19%8%
2160
11th to 20thDay
42%5%8%19%18%8%
2134
21st to endDay
32%7%9%22%24%6%
2160
May1st to 10thDay
33%7%10%24%19%7%
2160
11th to 20thDay
34%10%13%23%19%2
2128
21st to endDay
34%11%14%24%15%2
2337
June1st to 10thDay
41%12%12%24%10%1
2160
11th to 20thDay
35%12%15%24%12%2
2280
21st to endDay
45%12%16%18%9%
2340
July1st to 10thDay
47%14%18%17%41
2276
11th to 20thDay
46%13%21%16%31
2222
21st to endDay
44%13%18%20%5%1
2219
August1st to 10thDay
38%13%23%18%8%
2136
11th to 20thDay
46%13%18%17%5%1
2125
21st to endDay
43%12%17%17%9%2
2376
September1st to 10thDay
39%11%17%16%12%4
2160
11th to 20thDay
39%9%15%16%14%7%
2099
21st to endDay
34%8%11%21%18%9%
1980
October1st to 10thDay
27%6%11%20%22%14%
1917
11th to 20thDay
27%7%6%19%28%14%
1800
21st to endDay
30%45%17%28%16%
1980
November1st to 10thDay
28%5%8%20%27%12%
1858
11th to 20thDay
30%46%19%28%12%
1798
21st to endDay
38%5%7%19%20%11%
1710
December1st to 10thDay
40%5%9%19%18%8%
1710
11th to 20thDay
44%5%7%14%22%8%
2159
21st to endDay
45%6%8%16%21%4
3472
January1st to 10thNight
39%38%16%23%10%
2453
11th to 20thNight
38%5%6%17%22%11%
2295
21st to endNight
44%35%13%25%10%
2376
February1st to 10thNight
43%38%18%18%10%
2160
11th to 20thNight
42%5%6%15%20%12%
2099
21st to endNight
45%6%10%14%13%12%
1776
March1st to 10thNight
38%6%9%16%21%10%
2102
11th to 20thNight
42%5%13%15%18%7%
1980
21st to endNight
32%5%11%21%23%7%
2066
April1st to 10thNight
38%6%10%18%18%10%
1800
11th to 20thNight
39%5%9%21%17%9%
1775
21st to endNight
26%5%12%23%26%8%
1800
May1st to 10thNight
27%5%12%29%21%6%
1800
11th to 20thNight
31%8%16%22%20%2
1770
21st to endNight
28%9%18%29%14%3
1939
June1st to 10thNight
33%10%19%28%10%1
1800
11th to 20thNight
25%11%22%29%11%2
1672
21st to endNight
35%11%22%22%9%
1620
July1st to 10thNight
33%14%28%21%4
1575
11th to 20thNight
30%17%32%17%31
1610
21st to endNight
31%12%27%25%5%
1858
August1st to 10thNight
23%12%35%22%7%
1778
11th to 20thNight
31%18%28%18%5%1
1776
21st to endNight
35%14%22%18%8%4
1980
September1st to 10thNight
34%10%20%18%12%6%
1800
11th to 20thNight
34%8%18%17%14%8%
1841
21st to endNight
30%6%14%25%17%9%
1980
October1st to 10thNight
25%411%21%22%16%
2038
11th to 20thNight
24%5%9%22%25%15%
2160
21st to endNight
30%36%16%28%17%
2376
November1st to 10thNight
29%38%20%25%14%
2220
11th to 20thNight
31%47%17%28%15%
2377
21st to endNight
36%46%20%20%13%
2470
December1st to 10thNight
39%49%21%20%7%
2470
11th to 20thNight
42%5%8%13%19%14%
3014
21st to endNight
47%5%7%17%19%6%
4180

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%14%38%18%6%1
267
11th to 20thDay
20%15%35%23%6%1
240
21st to endDay
20%22%41%13%3
264
February1st to 10thDay
26%20%33%17%5%
240
11th to 20thDay
27%19%32%18%4
240
21st to endDay
16%28%40%15%2
198
March1st to 10thDay
14%19%40%23%4
240
11th to 20thDay
18%23%36%20%4
240
21st to endDay
18%14%34%24%9%1
375
April1st to 10thDay
15%13%34%26%11%1
420
11th to 20thDay
17%15%31%24%11%2
412
21st to endDay
11%9%29%32%16%3
420
May1st to 10thDay
13%7%28%28%20%4
423
11th to 20thDay
11%419%33%24%9%
447
21st to endDay
6%313%34%29%14%
485
June1st to 10thDay
13%210%32%27%17%
450
11th to 20thDay
7%211%31%34%15%
570
21st to endDay
10%210%27%31%21%
630
July1st to 10thDay
9%26%23%36%24%
621
11th to 20thDay
7%15%17%44%27%
569
21st to endDay
10%15%16%41%26%
488
August1st to 10thDay
5%15%19%39%31%
446
11th to 20thDay
8%1317%38%32%
439
21st to endDay
12%27%20%34%25%
495
September1st to 10thDay
7%25%25%40%21%
450
11th to 20thDay
10%48%24%37%16%
450
21st to endDay
9%210%29%37%13%
450
October1st to 10thDay
6%417%41%26%7%
387
11th to 20thDay
6%6%22%35%24%6%
270
21st to endDay
18%9%19%36%13%5%
297
November1st to 10thDay
14%6%22%38%19%2
270
11th to 20thDay
16%14%29%26%14%1
270
21st to endDay
15%13%36%25%9%2
270
December1st to 10thDay
19%10%30%26%12%2
270
11th to 20thDay
23%15%36%22%4
270
21st to endDay
27%12%31%21%8%1
297
January1st to 10thNight
20%10%31%32%6%1
945
11th to 20thNight
20%9%29%33%9%1
855
21st to endNight
22%11%31%31%5%
792
February1st to 10thNight
21%10%35%29%6%
720
11th to 20thNight
22%11%31%29%7%
703
21st to endNight
23%14%34%26%2
592
March1st to 10thNight
15%12%35%30%8%
662
11th to 20thNight
15%8%30%36%11%1
540
21st to endNight
14%10%30%34%11%1
594
April1st to 10thNight
15%10%29%32%14%
540
11th to 20thNight
15%9%29%31%15%1
533
21st to endNight
9%426%43%17%1
540
May1st to 10thNight
10%423%42%21%1
540
11th to 20thNight
7%317%41%27%4
531
21st to endNight
7%113%37%36%8%
584
June1st to 10thNight
9%16%34%39%9%
540
11th to 20thNight
216%29%48%13%
540
21st to endNight
7%17%26%41%17%
540
July1st to 10thNight
6%1317%52%21%
525
11th to 20thNight
5%1212%48%32%
522
21st to endNight
5%1414%54%23%
591
August1st to 10thNight
4117%48%29%
537
11th to 20thNight
4312%51%30%
534
21st to endNight
8%17%19%43%24%
594
September1st to 10thNight
8%15%21%46%19%
540
11th to 20thNight
10%37%24%45%11%
581
21st to endNight
11%19%32%40%7%
720
October1st to 10thNight
7%215%37%34%5%
720
11th to 20thNight
7%5%19%38%27%3
720
21st to endNight
13%7%19%36%23%3
792
November1st to 10thNight
14%5%14%44%21%2
740
11th to 20thNight
14%8%26%36%16%1
760
21st to endNight
14%8%27%33%16%1
760
December1st to 10thNight
17%10%27%30%16%1
760
11th to 20thNight
18%8%30%34%9%1
760
21st to endNight
24%11%28%29%7%
836
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