Shreveport
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shreveport clear sky chart from 2005-11-05 to 2017-09-18.

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
55%
15524
25%
46876
20%
15481
61%
15481
33%
27700

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
37%
897
26%
2327
12%
895
45%
895
31%
1528
January16th to endNight
34%
960
27%
2496
11%
960
43%
960
30%
1651
February1st to 15thNight
39%
880
24%
2287
11%
876
46%
876
34%
1432
February16th to endNight
29%
510
27%
1772
12%
510
44%
510
26%
1052
March1st to 15thNight
40%
540
25%
1980
18%
540
49%
540
23%
1190
March16th to endNight
42%
576
21%
2112
17%
576
50%
576
26%
1243
April1st to 15thNight
43%
539
25%
1856
19%
539
56%
539
32%
1023
April16th to endNight
43%
540
25%
1800
19%
540
55%
540
31%
1027
May1st to 15thNight
44%
540
20%
1746
16%
540
54%
540
27%
1079
May16th to endNight
61%
562
24%
1685
24%
561
66%
561
35%
992
June1st to 15thNight
82%
540
21%
1620
23%
540
84%
540
43%
876
June16th to endNight
77%
540
22%
1620
24%
540
79%
540
39%
910
July1st to 15thNight
82%
510
20%
1530
25%
510
82%
510
39%
874
July16th to endNight
86%
564
21%
1594
26%
531
87%
531
42%
872
August1st to 15thNight
88%
539
28%
1643
34%
536
88%
536
50%
814
August16th to endNight
74%
573
21%
1910
27%
573
74%
573
28%
1196
September1st to 15thNight
75%
540
23%
1833
27%
540
76%
540
33%
1045
September16th to endNight
75%
512
30%
1859
33%
512
77%
512
36%
972
October1st to 15thNight
68%
660
30%
1980
25%
660
70%
660
40%
1104
October16th to endNight
61%
704
36%
2112
27%
704
67%
704
44%
1113
November1st to 15thNight
57%
700
29%
2100
23%
700
62%
700
38%
1170
November16th to endNight
47%
738
32%
2178
22%
738
56%
738
33%
1308
December1st to 15thNight
44%
900
25%
2340
14%
900
50%
900
30%
1542
December16th to endNight
38%
960
22%
2496
11%
960
44%
960
28%
1687

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%5%245%3445%7%43%
47912
Night
11%424423447%50%
47072
TransparencyDay
39%6%10%19%18%5%
47612
Night
33%5%10%20%21%8%
46877
SeeingDay
11%315%23%31%15%
5575
Night
13%322%32%24%3
15528

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
16%7%3442333446%
1611
16th to endDay
19%5%2432334446%
1728
February1st to 15thDay
17%8%3443333444%
1575
16th to endDay
20%6%25%423235%43%
1709
March1st to 15thDay
21%7%345%23335%40%
1980
16th to endDay
13%6%36%43445%5%41%
2110
April1st to 15thDay
12%6%25%434446%47%
2091
16th to endDay
12%6%245%35%446%43%
2160
May1st to 15thDay
14%6%36%6%36%45%6%37%
2202
16th to endDay
8%426%5%36%7%7%9%37%
2430
June1st to 15thDay
5%325%7%47%6%7%8%41%
2340
16th to endDay
6%3245%46%7%8%10%39%
2340
July1st to 15thDay
8%325%6%45%5%8%11%36%
2340
16th to endDay
8%425%6%36%6%8%10%36%
2466
August1st to 15thDay
43145%35%6%7%11%46%
2304
16th to endDay
11%5%36%6%46%7%8%8%32%
2292
September1st to 15thDay
9%5%245%35%5%5%8%43%
2124
16th to endDay
8%4136%3446%7%50%
1815
October1st to 15thDay
9%4245%23346%52%
1650
16th to endDay
13%4121323459%
1760
November1st to 15thDay
11%5%23423446%50%
1758
16th to endDay
17%6%2432323448%
1779
December1st to 15thDay
19%8%35%312225%43%
1620
16th to endDay
17%8%25%42445%439%
1728
January1st to 15thNight
17%5%24323335%48%
2327
16th to endNight
18%5%2432333448%
2496
February1st to 15thNight
15%5%14323235%52%
2278
16th to endNight
17%424423325%48%
1772
March1st to 15thNight
17%6%23423336%45%
1980
16th to endNight
11%6%2442435%6%48%
2112
April1st to 15thNight
7%423425%45%7%52%
1856
16th to endNight
10%5%245%23347%49%
1800
May1st to 15thNight
10%5%26%5%2345%8%44%
1745
16th to endNight
6%335%32445%9%49%
1683
June1st to 15thNight
4233245%5%11%56%
1620
16th to endNight
42234345%6%9%53%
1620
July1st to 15thNight
4323425%5%6%11%49%
1620
16th to endNight
3113425%5%6%12%52%
1702
August1st to 15thNight
32131347%11%58%
1653
16th to endNight
8%415%5%35%6%6%9%41%
1910
September1st to 15thNight
9%31433346%8%50%
1833
16th to endNight
7%213425%446%56%
1859
October1st to 15thNight
7%32442335%6%57%
1980
16th to endNight
12%2231223462%
2112
November1st to 15thNight
9%423323346%56%
2100
16th to endNight
14%5%25%31223452%
2178
December1st to 15thNight
16%6%24423346%46%
2340
16th to endNight
17%7%3442334444%
2496

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
42%35%16%23%9%
1612
16th to endDay
41%36%17%23%8%
1728
February1st to 15thDay
45%36%16%19%8%
1576
16th to endDay
44%37%13%22%7%
1709
March1st to 15thDay
47%46%18%17%6%
1980
16th to endDay
43%47%17%23%2
2112
April1st to 15thDay
38%5%7%20%20%7%
2091
16th to endDay
41%6%8%17%21%4
2160
May1st to 15thDay
46%6%8%14%17%6%
2202
16th to endDay
38%9%13%23%13%1
2434
June1st to 15thDay
36%9%12%24%15%1
2340
16th to endDay
35%10%15%21%15%2
2340
July1st to 15thDay
36%10%17%23%10%
2201
16th to endDay
36%10%18%21%10%
2311
August1st to 15thDay
29%10%16%27%15%1
2290
16th to endDay
42%10%16%17%11%1
2292
September1st to 15thDay
37%7%13%18%16%7%
2124
16th to endDay
32%5%10%21%21%9%
1815
October1st to 15thDay
32%5%8%16%21%15%
1650
16th to endDay
28%36%16%33%12%
1760
November1st to 15thDay
33%5%8%20%23%8%
1758
16th to endDay
39%3414%29%8%
1779
December1st to 15thDay
44%37%17%19%6%
1620
16th to endDay
46%5%6%17%18%4
1728
January1st to 15thNight
39%45%13%26%10%
2327
16th to endNight
40%4415%23%11%
2496
February1st to 15thNight
36%37%19%22%11%
2288
16th to endNight
39%26%18%20%11%
1772
March1st to 15thNight
40%47%16%20%8%
1980
16th to endNight
37%5%9%18%23%5%
2112
April1st to 15thNight
30%5%11%22%19%10%
1856
16th to endNight
33%410%21%21%7%
1800
May1st to 15thNight
38%6%10%16%17%10%
1746
16th to endNight
31%6%14%25%19%2
1685
June1st to 15thNight
21%8%14%30%21%2
1620
16th to endNight
26%7%16%21%23%4
1620
July1st to 15thNight
26%8%21%29%13%2
1530
16th to endNight
21%9%25%26%14%1
1594
August1st to 15thNight
17%7%19%34%18%3
1643
16th to endNight
35%9%17%21%13%3
1910
September1st to 15thNight
30%7%16%18%18%9%
1833
16th to endNight
27%5%10%18%25%12%
1859
October1st to 15thNight
28%5%8%17%23%17%
1980
16th to endNight
25%36%15%29%19%
2112
November1st to 15thNight
29%49%19%26%11%
2100
16th to endNight
36%25%14%26%15%
2178
December1st to 15thNight
39%5%9%19%18%7%
2340
16th to endNight
43%47%17%21%6%
2496

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
11%8%44%21%14%
90
16th to endDay
18%6%50%18%6%
96
February1st to 15thDay
12%12%38%30%6%
90
16th to endDay
17%11%40%24%41
81
March1st to 15thDay
26%12%36%20%4
90
16th to endDay
10%12%26%29%18%3
96
April1st to 15thDay
12%8%36%27%15%
210
16th to endDay
17%6%23%28%20%3
270
May1st to 15thDay
18%7%23%33%14%3
339
16th to endDay
10%321%31%27%5%
517
June1st to 15thDay
6%6%28%45%12%
495
16th to endDay
6%9%25%37%20%
495
July1st to 15thDay
7%5%25%38%22%
475
16th to endDay
7%315%41%31%
515
August1st to 15thDay
8%212%48%27%
457
16th to endDay
17%1214%37%27%
332
September1st to 15thDay
7%412%40%35%
279
16th to endDay
3220%40%33%
96
October1st to 15thDay
115%28%42%12%
90
16th to endDay
18%213%21%23%19%
96
November1st to 15thDay
14%422%32%24%2
90
16th to endDay
22%7%30%23%12%4
90
December1st to 15thDay
26%7%22%27%11%4
90
16th to endDay
16%16%38%21%5%1
96
January1st to 15thNight
19%6%31%32%10%
900
16th to endNight
21%5%34%32%5%
960
February1st to 15thNight
18%7%31%35%7%
880
16th to endNight
20%7%38%29%3
510
March1st to 15thNight
19%6%28%39%6%
540
16th to endNight
13%434%35%10%
576
April1st to 15thNight
7%7%38%33%12%
539
16th to endNight
13%5%32%32%14%
540
May1st to 15thNight
13%430%35%14%1
540
16th to endNight
7%118%42%27%2
563
June1st to 15thNight
46%41%44%3
540
16th to endNight
47%30%48%7%
540
July1st to 15thNight
4332%50%8%
510
16th to endNight
3319%59%14%
564
August1st to 15thNight
4119%61%13%
539
16th to endNight
8%1422%51%11%
573
September1st to 15thNight
10%5%26%45%10%
540
16th to endNight
8%6%34%43%7%
512
October1st to 15thNight
8%13%36%34%5%
660
16th to endNight
13%219%34%26%3
704
November1st to 15thNight
10%323%37%22%2
700
16th to endNight
16%5%26%33%16%1
738
December1st to 15thNight
19%5%26%36%11%
900
16th to endNight
20%6%31%31%9%
960
Page generated at 2017-09-19 06:32:33. Version ac04

Copyright 2017 A. Danko


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