Abita Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Abita Springs clear sky chart from 2005-11-05 to 2017-09-10.

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
56%
15099
23%
47081
18%
15053
62%
15053
30%
28102

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 15thNight
40%
897
25%
2324
11%
892
49%
892
32%
1480
January16th to endNight
37%
799
26%
2335
14%
799
45%
799
26%
1485
February1st to 15thNight
38%
704
26%
2112
13%
701
49%
701
30%
1284
February16th to endNight
32%
631
23%
1893
10%
631
42%
631
27%
1195
March1st to 15thNight
38%
621
23%
2061
14%
621
47%
621
24%
1293
March16th to endNight
51%
576
25%
2037
21%
576
59%
576
31%
1111
April1st to 15thNight
48%
539
25%
1797
18%
539
57%
539
29%
1049
April16th to endNight
54%
540
27%
1800
24%
540
62%
540
35%
970
May1st to 15thNight
60%
539
21%
1799
21%
539
66%
539
33%
1003
May16th to endNight
69%
563
21%
1870
23%
561
72%
561
33%
1047
June1st to 15thNight
79%
540
14%
1774
16%
540
80%
540
31%
1039
June16th to endNight
73%
540
14%
1620
15%
540
74%
540
29%
1023
July1st to 15thNight
83%
510
14%
1530
15%
510
83%
510
31%
945
July16th to endNight
77%
564
11%
1743
15%
531
77%
531
26%
1114
August1st to 15thNight
84%
539
12%
1788
15%
536
84%
536
30%
1075
August16th to endNight
74%
573
14%
1910
16%
573
74%
573
24%
1236
September1st to 15thNight
73%
525
21%
1750
24%
525
74%
525
27%
1079
September16th to endNight
71%
627
28%
1785
24%
627
71%
627
35%
1067
October1st to 15thNight
69%
660
33%
1906
27%
660
73%
660
47%
1004
October16th to endNight
59%
704
35%
2112
28%
704
65%
704
42%
1114
November1st to 15thNight
58%
700
33%
2101
28%
700
64%
700
38%
1182
November16th to endNight
50%
720
31%
2340
24%
720
60%
720
35%
1272
December1st to 15thNight
45%
720
24%
2340
19%
720
52%
720
26%
1431
December16th to endNight
35%
768
19%
2354
12%
768
41%
768
21%
1604

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%5%25%5%36%5%6%8%38%
47507
Night
10%42442445%8%46%
47292
TransparencyDay
40%7%11%17%16%6%
47221
Night
34%6%13%19%17%8%
47083
SeeingDay
12%313%23%28%17%
5252
Night
12%418%30%26%7%
15100

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 15thDay
14%6%25%434446%42%
1611
16th to endDay
18%5%3442433445%
1883
February1st to 15thDay
13%6%24424447%45%
1750
16th to endDay
16%6%26%433445%41%
1580
March1st to 15thDay
17%6%25%424446%41%
1908
16th to endDay
10%6%25%6%25%46%7%43%
2185
April1st to 15thDay
12%426%435%6%5%7%40%
2151
16th to endDay
11%425%5%3446%9%41%
2160
May1st to 15thDay
11%4245%36%6%6%8%40%
2151
16th to endDay
8%5%25%6%36%6%8%9%38%
2244
June1st to 15thDay
7%426%8%6%9%7%8%11%27%
2181
16th to endDay
6%436%8%5%8%9%8%11%26%
2340
July1st to 15thDay
6%6%37%8%6%9%8%8%9%26%
2340
16th to endDay
7%6%37%8%6%9%9%8%10%21%
2303
August1st to 15thDay
7%5%27%7%5%8%9%8%10%27%
2160
16th to endDay
10%5%36%8%5%7%8%8%9%25%
2292
September1st to 15thDay
11%5%26%6%46%7%6%9%33%
2097
16th to endDay
8%426%6%46%5%6%7%40%
1832
October1st to 15thDay
6%413424447%54%
1722
16th to endDay
7%315%323346%57%
1760
November1st to 15thDay
8%5%2432345%6%52%
1754
16th to endDay
10%414313345%55%
1620
December1st to 15thDay
15%7%35%42445%5%42%
1620
16th to endDay
21%7%26%42435%6%34%
1863
January1st to 15thNight
15%5%23323347%46%
2324
16th to endNight
19%5%24423345%44%
2335
February1st to 15thNight
14%5%24323447%47%
2103
16th to endNight
18%6%2432235%6%43%
1893
March1st to 15thNight
13%5%25%5%35%35%6%43%
2061
16th to endNight
11%5%13324347%52%
2037
April1st to 15thNight
11%425%42345%6%49%
1797
16th to endNight
7%4233245%48%52%
1800
May1st to 15thNight
7%325%425%45%9%48%
1799
16th to endNight
6%42441447%8%51%
1869
June1st to 15thNight
5%415%435%6%8%12%42%
1774
16th to endNight
4425%6%47%7%7%9%41%
1620
July1st to 15thNight
2324435%7%8%14%41%
1620
16th to endNight
5%3246%47%6%9%13%35%
1862
August1st to 15thNight
32136%46%7%9%13%41%
1800
16th to endNight
7%425%5%36%6%8%12%36%
1910
September1st to 15thNight
6%5%245%35%5%7%12%41%
1750
16th to endNight
7%5%25%5%235%6%8%47%
1785
October1st to 15thNight
4413323347%62%
1906
16th to endNight
9%313313346%59%
2112
November1st to 15thNight
9%413424346%55%
2101
16th to endNight
9%423423246%55%
2340
December1st to 15thNight
12%5%25%5%24446%44%
2340
16th to endNight
19%8%34434446%36%
2354

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 15thDay
41%36%15%21%10%
1612
16th to endDay
42%35%16%21%9%
1883
February1st to 15thDay
37%48%17%21%10%
1752
16th to endDay
43%37%16%20%8%
1580
March1st to 15thDay
43%5%7%20%17%6%
1908
16th to endDay
37%5%9%18%21%6%
2187
April1st to 15thDay
39%7%8%18%18%7%
2151
16th to endDay
37%6%9%22%18%4
2160
May1st to 15thDay
37%7%9%21%15%7%
2151
16th to endDay
35%10%12%22%16%1
2248
June1st to 15thDay
42%12%12%20%11%
2181
16th to endDay
43%11%15%19%8%
2340
July1st to 15thDay
45%11%18%17%5%1
2201
16th to endDay
48%13%17%16%3
2159
August1st to 15thDay
44%12%19%15%6%
2148
16th to endDay
48%12%16%13%6%2
2292
September1st to 15thDay
41%11%16%16%10%3
2097
16th to endDay
38%8%12%15%18%6%
1832
October1st to 15thDay
26%7%7%18%23%16%
1722
16th to endDay
27%45%14%29%19%
1760
November1st to 15thDay
30%46%18%30%9%
1754
16th to endDay
29%37%17%25%16%
1620
December1st to 15thDay
42%5%8%19%17%6%
1620
16th to endDay
50%47%16%16%4
1863
January1st to 15thNight
37%37%17%22%11%
2324
16th to endNight
41%25%15%23%10%
2335
February1st to 15thNight
37%37%19%20%12%
2112
16th to endNight
40%47%16%19%12%
1893
March1st to 15thNight
41%5%8%16%21%7%
2061
16th to endNight
32%311%20%23%7%
2037
April1st to 15thNight
35%410%21%17%10%
1797
16th to endNight
30%413%23%20%8%
1800
May1st to 15thNight
31%5%12%25%18%6%
1800
16th to endNight
28%8%15%27%17%2
1871
June1st to 15thNight
29%10%20%27%11%
1774
16th to endNight
34%9%22%22%10%
1620
July1st to 15thNight
27%14%29%22%5%
1530
16th to endNight
34%12%28%21%3
1743
August1st to 15thNight
26%15%31%19%5%1
1788
16th to endNight
35%13%25%14%7%3
1910
September1st to 15thNight
34%10%19%17%12%5%
1750
16th to endNight
32%6%15%19%18%8%
1785
October1st to 15thNight
22%410%20%23%18%
1906
16th to endNight
26%26%15%26%21%
2112
November1st to 15thNight
31%36%18%28%11%
2101
16th to endNight
30%35%17%22%19%
2340
December1st to 15thNight
38%49%21%18%6%
2340
16th to endNight
48%48%17%15%6%
2354

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 15thDay
25%6%36%21%8%1
90
16th to endDay
22%21%38%14%2
96
February1st to 15thDay
12%17%35%27%5%1
90
16th to endDay
14%16%37%25%6%
81
March1st to 15thDay
28%10%43%16%1
90
16th to endDay
20%7%18%31%20%1
171
April1st to 15thDay
16%9%26%25%21%
270
16th to endDay
12%6%21%34%21%4
270
May1st to 15thDay
14%5%19%30%24%5%
288
16th to endDay
13%113%27%26%17%
331
June1st to 15thDay
11%25%25%33%23%
336
16th to endDay
8%17%24%34%24%
495
July1st to 15thDay
8%220%38%29%
475
16th to endDay
9%211%42%32%
352
August1st to 15thDay
8%1214%35%37%
313
16th to endDay
10%15%15%36%31%
332
September1st to 15thDay
12%421%37%24%
294
16th to endDay
9%5%24%44%15%
254
October1st to 15thDay
5%212%33%32%12%
162
16th to endDay
15%217%35%21%7%
96
November1st to 15thDay
24%223%32%15%2
90
16th to endDay
11%11%38%24%11%3
90
December1st to 15thDay
25%436%26%42
90
16th to endDay
32%7%28%22%9%
96
January1st to 15thNight
18%8%29%34%7%1
897
16th to endNight
22%9%27%33%7%
799
February1st to 15thNight
17%8%33%31%9%
704
16th to endNight
20%10%32%31%5%
631
March1st to 15thNight
17%8%31%33%9%
621
16th to endNight
14%6%24%37%16%1
576
April1st to 15thNight
12%7%26%34%18%
539
16th to endNight
10%325%40%18%1
540
May1st to 15thNight
8%319%41%25%1
540
16th to endNight
6%112%38%34%6%
563
June1st to 15thNight
6%230%48%10%
540
16th to endNight
415%22%46%20%
540
July1st to 15thNight
4115%52%26%
510
16th to endNight
6%112%50%29%
564
August1st to 15thNight
314%50%30%
539
16th to endNight
8%314%45%27%
573
September1st to 15thNight
9%2417%45%20%
525
16th to endNight
11%1332%44%7%
627
October1st to 15thNight
6%215%37%33%4
660
16th to endNight
11%5%19%32%26%4
704
November1st to 15thNight
11%319%38%22%4
700
16th to endNight
12%7%25%34%19%1
720
December1st to 15thNight
14%8%26%33%16%
720
16th to endNight
23%8%27%29%10%
768
Page generated at 2017-09-11 18:35:17. Version ac04

Copyright 2017 A. Danko


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