Cordele
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cordele clear sky chart from 2005-11-05 to 2017-12-01.

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%
15884
23%
47838
17%
15842
60%
15842
29%
29628

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
33%
718
23%
2327
12%
716
47%
716
24%
1429
January16th to endNight
34%
768
25%
2422
15%
768
46%
768
25%
1520
February1st to 15thNight
39%
704
25%
2109
13%
700
52%
700
30%
1282
February16th to endNight
34%
631
26%
1893
12%
631
47%
631
30%
1158
March1st to 15thNight
41%
720
27%
2036
14%
720
52%
720
34%
1219
March16th to endNight
45%
768
23%
2112
13%
768
52%
768
34%
1272
April1st to 15thNight
50%
694
25%
1952
17%
694
57%
694
38%
1144
April16th to endNight
55%
540
29%
1710
21%
540
64%
540
38%
925
May1st to 15thNight
59%
539
24%
1620
17%
539
66%
539
34%
953
May16th to endNight
70%
561
22%
1682
17%
561
72%
561
35%
1004
June1st to 15thNight
68%
540
14%
1620
13%
540
68%
540
24%
1104
June16th to endNight
74%
540
14%
1620
13%
540
74%
540
25%
1089
July1st to 15thNight
73%
510
11%
1530
10%
510
74%
510
24%
1068
July16th to endNight
71%
564
12%
1595
13%
531
72%
531
25%
1104
August1st to 15thNight
73%
539
13%
1662
13%
536
73%
536
23%
1128
August16th to endNight
66%
591
16%
1928
18%
591
67%
591
19%
1362
September1st to 15thNight
64%
720
17%
1980
16%
720
64%
720
24%
1373
September16th to endNight
62%
717
20%
1980
16%
717
65%
717
26%
1338
October1st to 15thNight
61%
720
29%
1988
24%
720
66%
720
37%
1189
October16th to endNight
59%
768
34%
2304
30%
768
67%
768
39%
1261
November1st to 15thNight
59%
760
29%
2385
25%
760
68%
760
37%
1290
November16th to endNight
47%
780
29%
2535
22%
780
59%
780
34%
1411
December1st to 15thNight
45%
724
24%
2352
20%
724
53%
724
28%
1394
December16th to endNight
41%
768
23%
2496
18%
768
49%
768
23%
1611

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
10%5%25%5%35%5%5%8%42%
48578
Night
10%42443445%7%45%
48040
TransparencyDay
38%7%12%17%17%6%
48279
Night
35%7%11%17%18%9%
47843
SeeingDay
11%314%23%25%20%
5742
Night
12%421%32%25%4
15889

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
11%6%26%5%24445%45%
1611
16th to endDay
14%5%24433346%46%
1800
February1st to 15thDay
14%6%15%424447%44%
1750
16th to endDay
15%5%24424345%48%
1580
March1st to 15thDay
11%5%24424446%48%
1923
16th to endDay
11%5%25%32335%7%48%
2111
April1st to 15thDay
10%5%245%34346%48%
2004
16th to endDay
9%313334447%54%
2250
May1st to 15thDay
8%5%24435%45%7%49%
2331
16th to endDay
5%415%5%35%7%6%9%43%
2431
June1st to 15thDay
9%436%5%37%6%7%10%34%
2340
16th to endDay
5%425%6%46%7%9%10%37%
2340
July1st to 15thDay
8%5%36%7%5%7%7%7%11%26%
2340
16th to endDay
8%435%8%5%8%8%9%10%27%
2465
August1st to 15thDay
11%5%26%7%5%7%9%8%11%23%
2285
16th to endDay
12%7%28%6%47%7%7%8%27%
2261
September1st to 15thDay
10%5%25%6%36%5%7%11%34%
1980
16th to endDay
12%6%26%7%36%447%38%
1980
October1st to 15thDay
13%414413346%51%
1971
16th to endDay
9%313222345%60%
1920
November1st to 15thDay
9%413313346%56%
1800
16th to endDay
12%5%24423336%51%
1755
December1st to 15thDay
15%43442445%6%45%
1622
16th to endDay
19%7%36%422347%37%
1728
January1st to 15thNight
13%5%25%425%446%45%
2327
16th to endNight
18%5%2432334446%
2422
February1st to 15thNight
14%5%24323346%49%
2103
16th to endNight
14%5%14333446%48%
1893
March1st to 15thNight
10%424423447%51%
2036
16th to endNight
11%415%323436%53%
2112
April1st to 15thNight
10%41432335%8%52%
1952
16th to endNight
7%3133245%5%9%53%
1710
May1st to 15thNight
7%225%426%46%8%50%
1619
16th to endNight
5%4245%346%6%10%47%
1682
June1st to 15thNight
8%425%6%47%6%8%11%33%
1620
16th to endNight
5%337%5%47%7%8%10%36%
1620
July1st to 15thNight
6%425%6%47%7%9%12%32%
1620
16th to endNight
7%436%5%38%7%8%11%33%
1703
August1st to 15thNight
7%425%5%46%7%9%13%32%
1673
16th to endNight
9%5%26%6%5%6%5%8%11%32%
1928
September1st to 15thNight
9%6%25%7%345%6%9%37%
1980
16th to endNight
7%6%26%6%35%6%7%8%38%
1980
October1st to 15thNight
11%41442335%6%53%
1988
16th to endNight
9%41332334459%
2304
November1st to 15thNight
8%413314346%57%
2385
16th to endNight
11%413324345%55%
2535
December1st to 15thNight
12%5%25%31436%6%47%
2352
16th to endNight
16%6%35%43445%6%40%
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
39%5%7%13%24%9%
1612
16th to endDay
38%46%17%21%11%
1800
February1st to 15thDay
39%47%15%21%10%
1752
16th to endDay
38%36%16%23%10%
1580
March1st to 15thDay
35%49%19%21%9%
1923
16th to endDay
36%6%11%15%23%6%
2112
April1st to 15thDay
36%5%7%19%20%9%
2004
16th to endDay
29%5%9%24%22%9%
2250
May1st to 15thDay
34%6%11%20%20%6%
2331
16th to endDay
34%8%16%23%13%3
2435
June1st to 15thDay
40%11%17%19%10%
2340
16th to endDay
35%12%18%18%13%2
2340
July1st to 15thDay
45%12%19%15%5%1
2201
16th to endDay
43%13%19%16%5%
2310
August1st to 15thDay
48%13%19%12%5%
2272
16th to endDay
49%12%16%12%7%1
2261
September1st to 15thDay
42%11%14%13%14%3
1980
16th to endDay
45%6%11%14%17%5%
1980
October1st to 15thDay
33%5%10%18%21%10%
1971
16th to endDay
26%46%15%28%19%
1920
November1st to 15thDay
29%38%18%24%14%
1800
16th to endDay
34%47%15%24%14%
1755
December1st to 15thDay
39%410%16%19%9%
1622
16th to endDay
46%49%18%13%7%
1728
January1st to 15thNight
40%45%16%24%8%
2327
16th to endNight
40%4413%24%11%
2422
February1st to 15thNight
37%37%14%22%14%
2112
16th to endNight
36%46%14%21%15%
1893
March1st to 15thNight
32%5%8%20%21%11%
2036
16th to endNight
33%410%17%24%9%
2112
April1st to 15thNight
31%49%19%22%12%
1952
16th to endNight
26%6%11%22%21%11%
1710
May1st to 15thNight
30%7%12%17%21%10%
1620
16th to endNight
28%9%15%25%15%5%
1684
June1st to 15thNight
39%11%16%20%11%
1620
16th to endNight
37%13%17%16%12%2
1620
July1st to 15thNight
37%15%23%15%6%1
1530
16th to endNight
38%13%21%18%7%1
1595
August1st to 15thNight
36%15%24%17%5%
1662
16th to endNight
42%14%16%16%8%1
1928
September1st to 15thNight
41%10%13%16%14%3
1980
16th to endNight
39%10%13%15%17%4
1980
October1st to 15thNight
31%5%10%19%19%13%
1988
16th to endNight
28%36%13%27%19%
2304
November1st to 15thNight
28%48%15%27%15%
2385
16th to endNight
31%47%18%22%16%
2535
December1st to 15thNight
36%5%11%18%21%8%
2352
16th to endNight
43%5%8%19%15%8%
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
13%11%32%25%8%8%
90
16th to endDay
17%15%40%13%11%1
96
February1st to 15thDay
8%21%35%23%10%1
90
16th to endDay
16%8%27%41%6%
81
March1st to 15thDay
11%9%29%33%14%1
213
16th to endDay
11%426%37%20%1
288
April1st to 15thDay
13%9%21%28%22%4
270
16th to endDay
8%318%30%27%12%
270
May1st to 15thDay
7%6%21%25%26%12%
288
16th to endDay
7%18%22%35%24%
331
June1st to 15thDay
13%6%18%28%33%
315
16th to endDay
7%318%31%37%
315
July1st to 15thDay
8%315%24%46%
305
16th to endDay
8%1313%26%46%
326
August1st to 15thDay
13%416%34%31%
313
16th to endDay
11%5%14%29%39%
332
September1st to 15thDay
13%17%21%30%24%
315
16th to endDay
15%26%25%29%19%
314
October1st to 15thDay
14%215%29%25%13%
315
16th to endDay
7%421%29%28%8%
336
November1st to 15thDay
16%321%27%26%4
218
16th to endDay
5%8%23%30%22%8%
135
December1st to 15thDay
25%5%28%22%10%7%
90
16th to endDay
28%12%17%23%15%2
96
January1st to 15thNight
16%10%35%27%9%
720
16th to endNight
18%8%34%31%7%
768
February1st to 15thNight
15%9%31%34%8%
704
16th to endNight
16%6%38%33%5%
631
March1st to 15thNight
11%9%32%36%9%
720
16th to endNight
13%7%28%32%16%1
768
April1st to 15thNight
13%5%27%34%17%1
694
16th to endNight
8%327%35%24%
540
May1st to 15thNight
7%224%35%26%3
540
16th to endNight
6%113%39%34%4
563
June1st to 15thNight
9%18%37%34%9%
540
16th to endNight
6%5%27%48%12%
540
July1st to 15thNight
8%426%41%17%
510
16th to endNight
7%5%21%50%13%
564
August1st to 15thNight
9%323%51%11%
539
16th to endNight
11%16%21%44%15%
591
September1st to 15thNight
11%18%24%42%11%
720
16th to endNight
11%111%34%36%3
717
October1st to 15thNight
14%116%33%30%3
720
16th to endNight
10%420%33%27%2
768
November1st to 15thNight
9%5%20%39%23%2
760
16th to endNight
11%7%29%32%17%1
780
December1st to 15thNight
14%5%28%34%15%1
724
16th to endNight
19%8%25%33%12%1
768
Page generated at 2017-12-02 09:14:24. Version ac04

Copyright 2017 A. Danko


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