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 2017-03-31.

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
53%
15048
23%
45338
17%
15006
60%
15006
29%
28129

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
49%
636
26%
1789
17%
636
56%
636
36%
1073
April16th to endNight
54%
495
28%
1568
21%
495
62%
495
37%
850
May1st to 15thNight
59%
494
25%
1485
17%
494
66%
494
33%
886
May16th to endNight
71%
513
21%
1538
17%
513
73%
513
36%
913
June1st to 15thNight
69%
495
15%
1485
14%
495
70%
495
26%
989
June16th to endNight
75%
495
14%
1485
13%
495
75%
495
25%
993
July1st to 15thNight
72%
465
11%
1395
10%
465
73%
465
23%
976
July16th to endNight
71%
522
12%
1469
12%
489
72%
489
25%
1016
August1st to 15thNight
73%
494
14%
1522
14%
491
73%
491
24%
1032
August16th to endNight
65%
541
15%
1766
17%
541
66%
541
18%
1259
September1st to 15thNight
64%
660
17%
1815
16%
660
65%
660
23%
1274
September16th to endNight
59%
657
18%
1815
14%
657
62%
657
24%
1252
October1st to 15thNight
61%
660
31%
1822
26%
660
67%
660
37%
1082
October16th to endNight
60%
704
32%
2112
29%
704
66%
704
38%
1170
November1st to 15thNight
57%
700
30%
2197
25%
700
66%
700
37%
1186
November16th to endNight
46%
720
29%
2340
21%
720
58%
720
34%
1303
December1st to 15thNight
45%
720
24%
2340
20%
720
53%
720
29%
1384
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
11%5%25%5%35%5%5%8%42%
45735
Night
10%42442445%7%45%
45540
TransparencyDay
38%7%12%17%17%6%
45436
Night
35%7%11%17%18%9%
45343
SeeingDay
11%315%23%25%20%
4795
Night
12%421%32%24%4
15053

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%
2106
April1st to 15thDay
11%5%245%34446%46%
1836
16th to endDay
9%313334447%54%
2062
May1st to 15thDay
8%5%24435%45%7%48%
2136
16th to endDay
5%415%5%35%7%7%9%43%
2223
June1st to 15thDay
8%426%5%37%6%7%11%36%
2145
16th to endDay
4325%6%36%7%9%10%39%
2145
July1st to 15thDay
9%5%36%7%5%7%7%7%11%26%
2145
16th to endDay
8%425%8%5%8%8%9%10%27%
2283
August1st to 15thDay
11%5%26%7%47%10%8%11%24%
2095
16th to endDay
13%7%28%6%47%7%7%8%27%
2072
September1st to 15thDay
9%5%26%6%46%5%7%11%33%
1815
16th to endDay
13%6%26%7%36%5%47%36%
1815
October1st to 15thDay
13%5%14413246%52%
1807
16th to endDay
9%313222345%59%
1760
November1st to 15thDay
10%5%13313346%56%
1658
16th to endDay
12%5%24423346%50%
1620
December1st to 15thDay
15%43442445%6%45%
1620
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
11%42433335%8%49%
1789
16th to endNight
7%3133245%5%8%54%
1568
May1st to 15thNight
7%325%426%46%8%48%
1484
16th to endNight
5%4245%246%6%10%47%
1538
June1st to 15thNight
8%4345%37%6%8%12%35%
1485
16th to endNight
4336%5%47%7%8%11%36%
1485
July1st to 15thNight
7%425%6%47%7%10%12%31%
1485
16th to endNight
7%436%5%38%7%8%11%33%
1577
August1st to 15thNight
7%425%5%5%6%7%9%13%32%
1533
16th to endNight
10%6%37%6%46%5%7%10%31%
1766
September1st to 15thNight
9%6%36%7%35%5%6%9%36%
1815
16th to endNight
8%7%26%6%45%6%7%8%36%
1815
October1st to 15thNight
11%423313346%53%
1822
16th to endNight
9%41332334458%
2112
November1st to 15thNight
8%413313346%56%
2197
16th to endNight
11%413324345%55%
2340
December1st to 15thNight
12%5%25%31436%6%47%
2340
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%
2107
April1st to 15thDay
38%6%7%18%20%8%
1836
16th to endDay
29%5%9%24%21%9%
2062
May1st to 15thDay
35%6%12%21%17%6%
2136
16th to endDay
33%7%17%24%13%2
2227
June1st to 15thDay
38%11%18%20%10%
2145
16th to endDay
33%12%19%19%14%2
2145
July1st to 15thDay
45%12%20%15%41
2006
16th to endDay
43%13%20%16%5%
2128
August1st to 15thDay
47%14%19%13%5%
2082
16th to endDay
50%11%15%12%7%1
2072
September1st to 15thDay
42%11%15%13%13%3
1815
16th to endDay
48%6%10%13%16%5%
1815
October1st to 15thDay
34%49%19%21%10%
1807
16th to endDay
26%46%15%27%18%
1760
November1st to 15thDay
29%37%17%25%15%
1658
16th to endDay
34%48%14%23%14%
1620
December1st to 15thDay
40%410%16%19%9%
1620
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
32%49%19%21%11%
1789
16th to endNight
27%6%10%22%20%12%
1568
May1st to 15thNight
31%7%13%18%19%8%
1485
16th to endNight
28%9%15%26%15%4
1540
June1st to 15thNight
37%11%17%21%11%
1485
16th to endNight
35%13%17%15%13%3
1485
July1st to 15thNight
38%14%23%15%6%1
1395
16th to endNight
38%13%21%18%7%
1469
August1st to 15thNight
36%14%24%17%5%
1522
16th to endNight
44%13%15%15%9%1
1766
September1st to 15thNight
42%11%14%16%13%3
1815
16th to endNight
41%9%12%14%16%4
1815
October1st to 15thNight
31%5%9%19%19%14%
1822
16th to endNight
29%37%14%26%19%
2112
November1st to 15thNight
28%47%14%28%16%
2197
16th to endNight
31%47%17%21%17%
2340
December1st to 15thNight
36%5%11%18%21%8%
2340
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%425%37%20%1
286
April1st to 15thDay
14%8%25%29%19%3
210
16th to endDay
10%320%29%27%9%
210
May1st to 15thDay
6%424%23%27%13%
228
16th to endDay
5%16%19%36%29%
267
June1st to 15thDay
9%5%18%29%35%
255
16th to endDay
3316%32%43%
255
July1st to 15thDay
9%417%25%42%
245
16th to endDay
7%1111%25%51%
270
August1st to 15thDay
12%416%35%30%
253
16th to endDay
13%311%32%38%
268
September1st to 15thDay
13%7%18%32%27%
255
16th to endDay
19%27%27%27%14%
254
October1st to 15thDay
16%114%29%27%10%
255
16th to endDay
8%320%29%28%9%
272
November1st to 15thDay
18%425%22%24%4
166
16th to endDay
5%8%30%27%20%7%
90
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%35%15%1
636
16th to endNight
9%328%35%22%1
495
May1st to 15thNight
8%223%35%26%3
495
16th to endNight
6%112%39%35%4
515
June1st to 15thNight
9%18%37%34%9%
495
16th to endNight
45%27%48%12%
495
July1st to 15thNight
9%428%39%16%
465
16th to endNight
8%5%21%50%13%
522
August1st to 15thNight
9%424%50%11%
494
16th to endNight
12%15%21%44%14%
541
September1st to 15thNight
11%17%23%43%11%
660
16th to endNight
12%112%37%32%2
657
October1st to 15thNight
15%116%34%30%2
660
16th to endNight
11%419%34%27%2
704
November1st to 15thNight
10%5%21%38%22%2
700
16th to endNight
12%7%30%32%16%1
720
December1st to 15thNight
14%5%28%34%15%1
720
16th to endNight
19%8%25%33%12%1
768
Page generated at 2017-04-01 08:23:13. Version ac04

Copyright 2017 A. Danko


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