Macon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Macon clear sky chart from 2005-11-05 to 2017-08-12.

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
50%
15451
23%
46553
16%
15409
58%
15409
29%
28656

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
29%
720
23%
2327
10%
716
46%
716
22%
1430
January16th to endNight
29%
768
24%
2451
12%
768
43%
768
23%
1515
February1st to 15thNight
33%
703
26%
2111
11%
701
48%
701
27%
1285
February16th to endNight
30%
631
26%
1893
10%
631
45%
631
27%
1172
March1st to 15thNight
34%
720
26%
2034
12%
720
46%
720
31%
1234
March16th to endNight
42%
768
22%
2112
12%
768
49%
768
31%
1285
April1st to 15thNight
44%
691
25%
1949
17%
691
51%
691
35%
1149
April16th to endNight
50%
540
29%
1692
18%
540
60%
540
35%
933
May1st to 15thNight
54%
539
23%
1620
15%
539
61%
539
34%
958
May16th to endNight
61%
561
21%
1682
16%
561
65%
561
33%
1034
June1st to 15thNight
67%
540
16%
1620
13%
540
68%
540
30%
1029
June16th to endNight
73%
540
16%
1620
15%
540
73%
540
31%
1015
July1st to 15thNight
74%
510
11%
1530
10%
510
75%
510
26%
1019
July16th to endNight
73%
564
14%
1595
13%
531
74%
531
27%
1061
August1st to 15thNight
72%
527
17%
1591
17%
524
72%
524
27%
1060
August16th to endNight
64%
540
15%
1765
17%
540
65%
540
21%
1203
September1st to 15thNight
66%
660
19%
1815
17%
660
67%
660
26%
1232
September16th to endNight
56%
657
21%
1815
15%
657
60%
657
26%
1213
October1st to 15thNight
56%
660
31%
1834
25%
660
63%
660
36%
1107
October16th to endNight
55%
704
34%
2112
27%
704
65%
704
37%
1164
November1st to 15thNight
53%
700
31%
2209
24%
700
64%
700
36%
1190
November16th to endNight
43%
720
28%
2340
19%
720
57%
720
31%
1312
December1st to 15thNight
38%
720
25%
2340
18%
720
49%
720
26%
1416
December16th to endNight
36%
768
22%
2496
16%
768
46%
768
20%
1640

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%25%5%35%5%5%7%42%
47410
Night
11%42442445%7%46%
46753
TransparencyDay
38%6%11%18%17%6%
47111
Night
36%5%11%18%19%8%
46556
SeeingDay
14%6%18%23%23%13%
5310
Night
13%7%21%30%22%4
15455

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%5%24433335%47%
1611
16th to endDay
16%5%24424337%44%
1770
February1st to 15thDay
15%425%32445%6%45%
1750
16th to endDay
16%5%24423447%44%
1580
March1st to 15thDay
15%424323346%47%
1924
16th to endDay
14%5%24434446%45%
2111
April1st to 15thDay
12%425%424445%50%
2008
16th to endDay
9%4133245%5%7%51%
2268
May1st to 15thDay
10%425%5%2445%8%46%
2331
16th to endDay
8%415%5%36%5%6%8%42%
2431
June1st to 15thDay
10%425%6%46%6%6%11%34%
2340
16th to endDay
5%3146%47%6%7%10%41%
2340
July1st to 15thDay
8%5%35%7%5%7%8%7%10%29%
2340
16th to endDay
6%427%8%5%8%8%8%11%28%
2465
August1st to 15thDay
11%5%26%6%47%7%8%10%28%
2269
16th to endDay
13%6%37%7%47%6%6%9%28%
2073
September1st to 15thDay
11%6%36%5%35%6%7%9%35%
1815
16th to endDay
14%6%35%5%36%447%37%
1815
October1st to 15thDay
14%413324346%52%
1795
16th to endDay
10%41331234460%
1760
November1st to 15thDay
10%423323345%55%
1646
16th to endDay
13%5%245%23335%49%
1620
December1st to 15thDay
16%42442435%5%45%
1620
16th to endDay
21%8%36%423335%37%
1728
January1st to 15thNight
16%6%24423345%47%
2327
16th to endNight
17%6%34423335%46%
2451
February1st to 15thNight
15%424423346%48%
2103
16th to endNight
14%5%2442444447%
1893
March1st to 15thNight
10%5%24424346%50%
2034
16th to endNight
12%5%14224447%50%
2112
April1st to 15thNight
12%42331345%7%51%
1949
16th to endNight
7%32342445%8%53%
1692
May1st to 15thNight
7%4144345%6%8%50%
1619
16th to endNight
7%325%5%35%6%6%9%44%
1682
June1st to 15thNight
8%5%35%5%35%5%6%10%40%
1620
16th to endNight
5%425%5%46%6%7%11%40%
1620
July1st to 15thNight
6%325%5%37%8%9%13%34%
1620
16th to endNight
5%415%6%48%6%8%13%34%
1703
August1st to 15thNight
6%326%7%45%7%8%12%36%
1602
16th to endNight
12%5%26%6%46%5%7%10%32%
1765
September1st to 15thNight
8%5%35%6%36%7%6%9%37%
1815
16th to endNight
11%6%26%6%35%5%5%6%41%
1815
October1st to 15thNight
12%414323335%53%
1834
16th to endNight
9%323323445%57%
2112
November1st to 15thNight
9%413313247%56%
2209
16th to endNight
13%314413246%53%
2340
December1st to 15thNight
14%5%24424336%47%
2340
16th to endNight
20%5%25%424345%39%
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%46%15%26%6%
1612
16th to endDay
40%36%17%23%8%
1770
February1st to 15thDay
38%35%19%22%8%
1752
16th to endDay
39%45%18%23%8%
1580
March1st to 15thDay
37%48%19%20%9%
1924
16th to endDay
39%5%9%19%20%5%
2112
April1st to 15thDay
35%49%20%20%9%
2008
16th to endDay
30%5%10%21%23%8%
2268
May1st to 15thDay
35%6%12%20%21%5%
2331
16th to endDay
36%8%14%24%14%2
2435
June1st to 15thDay
41%8%15%23%9%1
2340
16th to endDay
33%9%18%21%14%2
2340
July1st to 15thDay
43%12%19%15%6%2
2201
16th to endDay
42%11%18%19%6%1
2310
August1st to 15thDay
44%11%18%17%7%
2256
16th to endDay
50%10%13%14%10%1
2073
September1st to 15thDay
42%9%13%16%14%3
1815
16th to endDay
44%6%9%18%15%5%
1815
October1st to 15thDay
33%310%20%22%9%
1795
16th to endDay
27%35%16%30%15%
1760
November1st to 15thDay
31%36%16%27%15%
1646
16th to endDay
37%36%15%25%11%
1620
December1st to 15thDay
38%410%18%19%9%
1620
16th to endDay
49%38%16%15%7%
1728
January1st to 15thNight
39%36%18%24%7%
2327
16th to endNight
41%25%14%23%11%
2451
February1st to 15thNight
37%3419%21%12%
2112
16th to endNight
38%45%17%22%11%
1893
March1st to 15thNight
34%49%19%21%10%
2034
16th to endNight
34%411%19%21%9%
2112
April1st to 15thNight
32%39%23%21%10%
1949
16th to endNight
28%6%10%21%21%11%
1692
May1st to 15thNight
31%6%13%19%23%6%
1620
16th to endNight
33%7%14%25%15%3
1684
June1st to 15thNight
36%7%17%25%12%
1620
16th to endNight
35%7%21%18%13%3
1620
July1st to 15thNight
35%13%22%18%6%2
1530
16th to endNight
36%11%22%19%8%1
1595
August1st to 15thNight
36%11%19%21%9%1
1591
16th to endNight
43%10%18%15%10%1
1765
September1st to 15thNight
39%10%15%16%15%3
1815
16th to endNight
41%7%11%17%16%5%
1815
October1st to 15thNight
33%48%18%22%11%
1834
16th to endNight
28%35%15%29%16%
2112
November1st to 15thNight
29%36%16%29%15%
2209
16th to endNight
33%26%16%26%14%
2340
December1st to 15thNight
38%48%19%21%8%
2340
16th to endNight
46%47%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
14%21%37%15%8%2
90
16th to endDay
12%34%38%7%7%
96
February1st to 15thDay
12%32%36%15%3
90
16th to endDay
20%20%44%11%2
81
March1st to 15thDay
17%14%29%23%12%1
214
16th to endDay
15%8%31%25%17%
288
April1st to 15thDay
15%15%22%21%21%2
270
16th to endDay
12%5%22%30%22%6%
270
May1st to 15thDay
13%9%23%23%15%14%
288
16th to endDay
11%317%24%28%15%
331
June1st to 15thDay
13%110%24%27%22%
315
16th to endDay
7%110%27%24%28%
315
July1st to 15thDay
9%8%19%34%28%
305
16th to endDay
5%6%19%39%29%
326
August1st to 15thDay
17%1423%31%22%
297
16th to endDay
15%2323%33%21%
268
September1st to 15thDay
15%17%19%34%20%
255
16th to endDay
20%216%33%20%8%
254
October1st to 15thDay
19%5%18%25%23%7%
255
16th to endDay
9%6%19%30%25%8%
272
November1st to 15thDay
22%9%26%20%18%1
154
16th to endDay
12%11%27%34%11%3
90
December1st to 15thDay
21%12%34%22%10%
90
16th to endDay
33%15%22%20%6%1
96
January1st to 15thNight
18%18%29%25%8%
720
16th to endNight
18%16%30%28%5%
768
February1st to 15thNight
16%14%31%31%6%
704
16th to endNight
17%14%33%30%3
631
March1st to 15thNight
14%12%35%28%9%
720
16th to endNight
15%11%26%30%15%
768
April1st to 15thNight
15%9%27%30%16%
691
16th to endNight
8%6%28%32%21%1
540
May1st to 15thNight
10%424%31%25%3
540
16th to endNight
10%216%35%30%4
563
June1st to 15thNight
8%111%38%32%8%
540
16th to endNight
6%16%32%42%11%
540
July1st to 15thNight
9%6%27%40%15%
510
16th to endNight
6%16%29%44%11%
564
August1st to 15thNight
7%428%48%10%
527
16th to endNight
15%1327%40%11%
540
September1st to 15thNight
11%18%26%40%12%
660
16th to endNight
15%214%33%30%4
657
October1st to 15thNight
15%318%31%25%4
660
16th to endNight
10%7%21%32%25%2
704
November1st to 15thNight
11%7%21%35%22%1
700
16th to endNight
15%11%25%29%16%1
720
December1st to 15thNight
17%9%28%28%14%1
720
16th to endNight
22%12%24%30%9%
768
Page generated at 2017-08-13 14:16:53. Version ac04

Copyright 2017 A. Danko


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