Milledgeville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Milledgeville clear sky chart from 2005-11-05 to 2017-12-02.

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
49%
15923
24%
47846
16%
15879
58%
15879
29%
29247

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
27%
720
24%
2327
10%
716
45%
716
22%
1407
January16th to endNight
28%
768
24%
2478
12%
768
43%
768
22%
1517
February1st to 15thNight
31%
704
26%
2110
11%
700
47%
700
26%
1288
February16th to endNight
28%
631
26%
1893
9%
631
45%
631
26%
1148
March1st to 15thNight
34%
720
27%
2022
12%
720
47%
720
31%
1218
March16th to endNight
39%
768
21%
2112
10%
768
47%
768
30%
1297
April1st to 15thNight
41%
715
26%
1973
15%
715
50%
715
36%
1165
April16th to endNight
50%
540
28%
1671
18%
540
60%
540
35%
936
May1st to 15thNight
54%
539
24%
1620
14%
539
62%
539
34%
947
May16th to endNight
61%
561
22%
1682
15%
561
66%
561
32%
1030
June1st to 15thNight
65%
540
16%
1620
13%
540
67%
540
28%
1048
June16th to endNight
73%
540
17%
1620
15%
540
74%
540
32%
995
July1st to 15thNight
71%
510
11%
1530
10%
510
72%
510
26%
1020
July16th to endNight
76%
564
14%
1595
12%
531
78%
531
28%
1031
August1st to 15thNight
70%
539
16%
1609
16%
536
71%
536
25%
1093
August16th to endNight
64%
603
16%
1923
16%
603
65%
603
21%
1305
September1st to 15thNight
65%
720
18%
1980
16%
720
67%
720
28%
1318
September16th to endNight
60%
717
23%
1980
18%
717
64%
717
31%
1267
October1st to 15thNight
55%
720
30%
2019
24%
720
62%
720
36%
1205
October16th to endNight
53%
768
36%
2304
28%
768
66%
768
39%
1249
November1st to 15thNight
53%
760
30%
2382
25%
760
62%
760
35%
1299
November16th to endNight
43%
780
29%
2535
19%
780
57%
780
30%
1420
December1st to 15thNight
39%
728
25%
2365
17%
728
51%
728
26%
1429
December16th to endNight
35%
768
22%
2496
15%
768
45%
768
20%
1615

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%7%42%
48596
Night
11%42442445%7%46%
48047
TransparencyDay
38%6%11%19%18%5%
48297
Night
35%5%11%19%19%7%
47850
SeeingDay
14%6%18%24%23%11%
5765
Night
14%7%21%30%22%3
15926

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
15%6%14424435%46%
1611
16th to endDay
15%6%34423446%45%
1745
February1st to 15thDay
14%5%25%424446%45%
1750
16th to endDay
16%5%14323346%46%
1580
March1st to 15thDay
15%5%1432335%7%47%
1938
16th to endDay
14%5%2442445%5%46%
2111
April1st to 15thDay
11%414425%45%5%49%
1984
16th to endDay
8%315%4245%48%50%
2287
May1st to 15thDay
10%425%5%345%6%6%45%
2331
16th to endDay
9%415%6%36%7%6%8%40%
2431
June1st to 15thDay
10%425%6%47%6%7%11%34%
2340
16th to endDay
4325%7%37%7%7%11%39%
2340
July1st to 15thDay
8%5%25%7%5%7%7%8%10%31%
2340
16th to endDay
6%437%7%5%8%8%9%11%26%
2465
August1st to 15thDay
9%5%26%7%48%8%8%11%27%
2340
16th to endDay
12%7%27%7%47%6%6%8%28%
2263
September1st to 15thDay
11%436%6%35%6%7%8%36%
1980
16th to endDay
13%7%26%4235%6%6%40%
1980
October1st to 15thDay
15%423323346%51%
1941
16th to endDay
10%412322445%58%
1920
November1st to 15thDay
11%423424246%54%
1804
16th to endDay
13%4235%23337%49%
1755
December1st to 15thDay
15%5%2442445%5%44%
1632
16th to endDay
22%7%3432335%5%38%
1728
January1st to 15thNight
14%6%24324345%47%
2327
16th to endNight
16%5%34423335%46%
2478
February1st to 15thNight
15%423423346%48%
2103
16th to endNight
13%5%24324446%47%
1893
March1st to 15thNight
11%424424337%50%
2022
16th to endNight
13%424323346%50%
2112
April1st to 15thNight
13%313313448%51%
1973
16th to endNight
8%3144345%48%51%
1671
May1st to 15thNight
7%424435%6%5%8%48%
1619
16th to endNight
7%316%5%35%5%7%9%44%
1682
June1st to 15thNight
8%6%245%46%5%6%10%38%
1620
16th to endNight
44145%36%7%8%12%40%
1620
July1st to 15thNight
6%425%6%36%7%10%12%33%
1620
16th to endNight
5%3145%47%8%9%14%34%
1703
August1st to 15thNight
7%435%7%46%6%8%12%32%
1620
16th to endNight
12%425%6%45%7%7%10%32%
1923
September1st to 15thNight
10%4146%45%6%7%9%38%
1980
16th to endNight
12%4145%35%45%7%44%
1980
October1st to 15thNight
14%423412336%53%
2019
16th to endNight
9%31332444459%
2304
November1st to 15thNight
10%423313345%57%
2382
16th to endNight
12%323424336%53%
2535
December1st to 15thNight
13%5%245%24346%47%
2365
16th to endNight
19%6%24424345%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
40%48%15%26%5%
1612
16th to endDay
39%36%17%24%8%
1745
February1st to 15thDay
39%26%20%22%7%
1752
16th to endDay
38%45%19%25%7%
1580
March1st to 15thDay
36%48%20%20%9%
1938
16th to endDay
38%49%21%19%5%
2112
April1st to 15thDay
34%49%20%21%8%
1984
16th to endDay
31%410%21%23%7%
2287
May1st to 15thDay
36%412%20%20%5%
2331
16th to endDay
37%7%14%23%14%2
2435
June1st to 15thDay
41%8%14%23%10%1
2340
16th to endDay
35%9%18%20%14%2
2340
July1st to 15thDay
41%10%20%16%7%3
2201
16th to endDay
42%12%17%19%6%1
2310
August1st to 15thDay
45%10%16%18%8%
2327
16th to endDay
49%9%14%15%10%1
2263
September1st to 15thDay
42%9%12%16%16%3
1980
16th to endDay
42%5%9%19%17%4
1980
October1st to 15thDay
32%49%20%24%8%
1941
16th to endDay
28%3416%31%15%
1920
November1st to 15thDay
32%36%17%25%14%
1804
16th to endDay
35%36%17%26%10%
1755
December1st to 15thDay
40%310%18%19%8%
1632
16th to endDay
48%37%17%16%6%
1728
January1st to 15thNight
39%36%17%25%7%
2327
16th to endNight
40%25%16%23%10%
2478
February1st to 15thNight
38%25%18%22%11%
2112
16th to endNight
37%36%18%23%10%
1893
March1st to 15thNight
34%49%19%22%9%
2022
16th to endNight
34%410%19%21%9%
2112
April1st to 15thNight
31%38%24%22%9%
1973
16th to endNight
29%411%21%21%11%
1671
May1st to 15thNight
30%7%12%21%21%5%
1620
16th to endNight
33%7%13%25%15%3
1684
June1st to 15thNight
38%8%16%25%11%
1620
16th to endNight
32%8%20%21%12%3
1620
July1st to 15thNight
36%12%22%19%6%2
1530
16th to endNight
34%12%24%19%8%1
1595
August1st to 15thNight
40%10%18%21%8%
1609
16th to endNight
42%10%18%17%10%
1923
September1st to 15thNight
38%9%15%16%15%4
1980
16th to endNight
37%6%12%19%18%5%
1980
October1st to 15thNight
33%47%18%25%9%
2019
16th to endNight
26%4416%30%16%
2304
November1st to 15thNight
30%36%17%27%14%
2382
16th to endNight
33%37%16%25%13%
2535
December1st to 15thNight
38%49%19%21%8%
2365
16th to endNight
45%37%18%17%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
21%15%34%16%10%2
90
16th to endDay
20%32%30%7%9%
96
February1st to 15thDay
15%24%41%17%1
90
16th to endDay
22%14%48%12%2
81
March1st to 15thDay
17%13%33%24%11%
228
16th to endDay
16%10%32%23%16%
288
April1st to 15thDay
17%12%23%20%23%1
270
16th to endDay
11%5%25%29%22%6%
270
May1st to 15thDay
13%9%26%22%15%13%
288
16th to endDay
13%5%15%24%28%12%
331
June1st to 15thDay
13%39%26%26%19%
315
16th to endDay
6%19%31%26%25%
315
July1st to 15thDay
9%7%24%34%24%
305
16th to endDay
6%17%21%37%25%
326
August1st to 15thDay
16%6%24%33%17%
313
16th to endDay
13%8%25%31%19%
332
September1st to 15thDay
13%213%24%31%14%
315
16th to endDay
20%111%27%24%13%
314
October1st to 15thDay
21%317%26%21%8%
315
16th to endDay
11%6%20%27%25%7%
336
November1st to 15thDay
19%428%23%20%2
222
16th to endDay
10%11%25%35%13%3
135
December1st to 15thDay
19%12%35%23%9%
94
16th to endDay
33%15%25%18%6%1
96
January1st to 15thNight
19%16%30%24%9%
720
16th to endNight
20%16%30%27%4
768
February1st to 15thNight
21%13%29%30%5%
704
16th to endNight
17%16%34%28%3
631
March1st to 15thNight
15%13%34%29%7%
720
16th to endNight
15%12%27%28%14%
768
April1st to 15thNight
15%11%28%27%16%
715
16th to endNight
9%8%25%37%18%1
540
May1st to 15thNight
9%5%26%33%21%3
540
16th to endNight
10%118%31%32%6%
563
June1st to 15thNight
11%111%36%32%7%
540
16th to endNight
6%17%35%39%10%
540
July1st to 15thNight
9%7%29%40%12%
510
16th to endNight
6%15%31%45%9%
564
August1st to 15thNight
9%5%28%46%8%
539
16th to endNight
15%26%27%39%8%
603
September1st to 15thNight
13%19%27%40%7%
720
16th to endNight
15%114%32%30%5%
717
October1st to 15thNight
16%321%28%25%5%
720
16th to endNight
11%6%23%30%24%2
768
November1st to 15thNight
12%5%22%32%23%2
760
16th to endNight
13%11%26%28%18%1
780
December1st to 15thNight
17%10%28%28%14%1
728
16th to endNight
22%12%25%29%9%
768
Page generated at 2017-12-03 11:16:43. Version ac04

Copyright 2017 A. Danko


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