Valdosta
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Valdosta clear sky chart from 2005-11-05 to 2017-09-23.

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%
15695
22%
47009
17%
15654
61%
15654
29%
29103

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
35%
717
22%
2327
13%
716
48%
716
25%
1403
January16th to endNight
36%
768
24%
2421
15%
768
47%
768
25%
1495
February1st to 15thNight
38%
703
25%
2107
12%
699
51%
699
28%
1286
February16th to endNight
36%
631
26%
1893
14%
631
48%
631
30%
1149
March1st to 15thNight
46%
720
27%
2009
16%
720
56%
720
35%
1205
March16th to endNight
45%
768
25%
2112
15%
768
52%
768
35%
1244
April1st to 15thNight
49%
718
24%
1976
17%
718
55%
718
36%
1185
April16th to endNight
56%
573
29%
1737
22%
573
63%
573
38%
961
May1st to 15thNight
63%
539
26%
1619
18%
539
69%
539
39%
909
May16th to endNight
71%
561
23%
1682
20%
561
72%
561
34%
1004
June1st to 15thNight
71%
540
14%
1620
11%
540
72%
540
27%
1074
June16th to endNight
74%
540
14%
1620
13%
540
75%
540
25%
1096
July1st to 15thNight
76%
510
10%
1530
9%
510
76%
510
27%
1010
July16th to endNight
75%
564
10%
1595
9%
531
76%
531
24%
1100
August1st to 15thNight
74%
539
10%
1656
11%
536
74%
536
22%
1140
August16th to endNight
67%
623
12%
1960
13%
623
67%
623
19%
1407
September1st to 15thNight
63%
720
13%
1980
12%
720
63%
720
21%
1426
September16th to endNight
58%
689
19%
1903
15%
689
61%
689
26%
1307
October1st to 15thNight
60%
660
32%
1831
26%
660
66%
660
39%
1076
October16th to endNight
58%
704
31%
2112
28%
704
65%
704
38%
1183
November1st to 15thNight
52%
700
31%
2143
25%
700
61%
700
36%
1196
November16th to endNight
46%
720
28%
2340
20%
720
59%
720
35%
1283
December1st to 15thNight
44%
720
24%
2340
19%
720
53%
720
28%
1401
December16th to endNight
43%
768
23%
2496
18%
768
51%
768
24%
1563

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%6%35%5%6%8%40%
47881
Night
9%4245%245%5%8%45%
47214
TransparencyDay
39%8%11%17%15%6%
47582
Night
35%7%12%18%16%9%
47017
SeeingDay
11%415%21%26%20%
5571
Night
11%5%21%31%25%4
15702

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
14%7%2443345%7%42%
1611
16th to endDay
14%6%25%423446%45%
1800
February1st to 15thDay
14%6%25%434445%45%
1750
16th to endDay
13%7%24323236%49%
1580
March1st to 15thDay
8%424434448%50%
1950
16th to endDay
10%5%25%42435%7%48%
2111
April1st to 15thDay
10%325%5%25%445%49%
1972
16th to endDay
7%32342445%8%51%
2232
May1st to 15thDay
7%313335%5%6%10%48%
2331
16th to endDay
6%4247%46%5%6%8%43%
2431
June1st to 15thDay
9%426%7%5%7%7%7%9%32%
2340
16th to endDay
8%425%7%48%7%9%10%30%
2340
July1st to 15thDay
7%5%36%8%5%8%8%9%11%26%
2340
16th to endDay
8%5%38%8%5%8%7%9%10%22%
2465
August1st to 15thDay
10%6%38%9%6%7%7%9%10%20%
2289
16th to endDay
13%7%37%7%47%7%7%8%25%
2229
September1st to 15thDay
11%6%35%8%5%7%7%8%10%26%
1980
16th to endDay
13%7%26%7%45%5%5%8%33%
1894
October1st to 15thDay
11%6%14414347%50%
1796
16th to endDay
8%425%5%13435%55%
1760
November1st to 15thDay
7%314314347%57%
1712
16th to endDay
9%5%24423346%52%
1620
December1st to 15thDay
13%6%25%4345%5%6%42%
1620
16th to endDay
17%7%35%5%235%45%38%
1728
January1st to 15thNight
12%5%3442445%7%45%
2327
16th to endNight
13%5%34423445%46%
2421
February1st to 15thNight
11%6%245%24335%49%
2103
16th to endNight
12%5%24423346%49%
1893
March1st to 15thNight
8%424425%348%51%
2009
16th to endNight
9%314423436%54%
2112
April1st to 15thNight
8%5%24314448%52%
1976
16th to endNight
5%31342446%7%55%
1737
May1st to 15thNight
6%32332446%9%53%
1619
16th to endNight
43245%246%6%8%49%
1682
June1st to 15thNight
8%3245%36%7%9%13%34%
1620
16th to endNight
6%425%5%38%6%9%11%35%
1620
July1st to 15thNight
4226%5%47%7%8%13%35%
1620
16th to endNight
5%4347%47%8%9%13%32%
1703
August1st to 15thNight
6%426%6%37%8%11%14%30%
1667
16th to endNight
9%5%25%6%37%7%9%12%29%
1960
September1st to 15thNight
10%5%26%7%46%7%6%9%31%
1980
16th to endNight
9%6%38%6%345%6%9%36%
1903
October1st to 15thNight
8%5%14422346%54%
1831
16th to endNight
8%42332344456%
2112
November1st to 15thNight
8%424423346%54%
2143
16th to endNight
9%424423446%53%
2340
December1st to 15thNight
13%5%3442435%6%46%
2340
16th to endNight
13%7%35%424447%43%
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%49%17%18%10%
1612
16th to endDay
39%46%17%21%10%
1800
February1st to 15thDay
40%36%13%21%13%
1752
16th to endDay
38%37%14%23%11%
1580
March1st to 15thDay
32%49%20%23%9%
1950
16th to endDay
35%5%9%19%20%9%
2112
April1st to 15thDay
36%5%8%18%22%9%
1972
16th to endDay
29%6%9%23%21%9%
2232
May1st to 15thDay
29%7%12%21%21%7%
2331
16th to endDay
35%8%14%21%15%3
2435
June1st to 15thDay
43%12%15%19%8%1
2340
16th to endDay
42%13%16%17%8%1
2340
July1st to 15thDay
45%13%22%15%3
2201
16th to endDay
49%13%18%14%3
2310
August1st to 15thDay
53%14%18%10%3
2276
16th to endDay
51%14%16%12%4
2229
September1st to 15thDay
48%13%13%14%9%1
1980
16th to endDay
47%7%12%13%14%4
1894
October1st to 15thDay
34%48%18%21%12%
1796
16th to endDay
30%45%15%27%15%
1760
November1st to 15thDay
26%47%19%27%14%
1712
16th to endDay
33%37%15%24%15%
1620
December1st to 15thDay
41%49%17%17%8%
1620
16th to endDay
45%49%17%13%8%
1728
January1st to 15thNight
38%49%15%19%11%
2327
16th to endNight
39%47%13%22%12%
2421
February1st to 15thNight
37%36%15%21%16%
2112
16th to endNight
36%47%16%18%15%
1893
March1st to 15thNight
32%5%9%21%21%10%
2009
16th to endNight
31%410%18%22%12%
2112
April1st to 15thNight
32%5%8%18%24%11%
1976
16th to endNight
27%5%10%22%22%10%
1737
May1st to 15thNight
26%6%13%22%18%11%
1620
16th to endNight
28%10%13%26%16%4
1684
June1st to 15thNight
35%11%21%20%8%1
1620
16th to endNight
37%13%20%18%9%1
1620
July1st to 15thNight
36%11%28%18%4
1530
16th to endNight
35%16%25%17%3
1595
August1st to 15thNight
36%16%28%14%4
1656
16th to endNight
43%14%21%15%41
1960
September1st to 15thNight
45%11%17%14%10%1
1980
16th to endNight
42%8%14%17%11%5%
1903
October1st to 15thNight
30%5%10%20%20%13%
1831
16th to endNight
29%46%15%24%18%
2112
November1st to 15thNight
30%36%20%23%14%
2143
16th to endNight
30%49%16%22%16%
2340
December1st to 15thNight
38%311%20%18%7%
2340
16th to endNight
41%49%21%14%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
17%11%36%11%13%10%
90
16th to endDay
18%18%34%17%10%
96
February1st to 15thDay
10%26%27%20%15%
90
16th to endDay
8%14%39%29%7%
81
March1st to 15thDay
12%10%28%32%15%
240
16th to endDay
11%10%26%27%21%3
288
April1st to 15thDay
11%10%20%28%23%5%
270
16th to endDay
7%323%25%25%14%
270
May1st to 15thDay
8%6%15%31%23%13%
288
16th to endDay
6%10%19%35%26%
331
June1st to 15thDay
12%8%15%30%33%
315
16th to endDay
13%314%32%35%
315
July1st to 15thDay
7%114%31%45%
305
16th to endDay
11%313%32%38%
326
August1st to 15thDay
17%410%34%31%
313
16th to endDay
10%6%14%26%41%
332
September1st to 15thDay
16%9%20%25%27%
315
16th to endDay
18%9%19%31%20%
283
October1st to 15thDay
14%214%29%29%8%
255
16th to endDay
7%5%22%26%29%7%
272
November1st to 15thDay
11%224%34%19%7%
220
16th to endDay
5%7%35%32%13%5%
90
December1st to 15thDay
414%36%27%12%4
90
16th to endDay
25%7%19%30%12%5%
96
January1st to 15thNight
14%10%34%28%9%2
720
16th to endNight
17%11%31%32%8%
768
February1st to 15thNight
15%12%29%31%10%
704
16th to endNight
15%9%33%36%5%
631
March1st to 15thNight
10%9%30%39%10%
720
16th to endNight
12%7%28%32%17%
768
April1st to 15thNight
9%7%29%36%16%
718
16th to endNight
6%327%35%23%1
573
May1st to 15thNight
7%223%37%25%2
540
16th to endNight
5%112%34%40%4
563
June1st to 15thNight
12%5%31%39%10%
540
16th to endNight
7%5%26%45%15%
540
July1st to 15thNight
5%424%46%18%
510
16th to endNight
7%1321%50%16%
564
August1st to 15thNight
7%319%57%12%
539
16th to endNight
11%7%22%40%17%
623
September1st to 15thNight
11%17%27%40%11%
720
16th to endNight
13%114%32%33%4
689
October1st to 15thNight
10%119%35%30%2
660
16th to endNight
9%422%34%26%2
704
November1st to 15thNight
10%5%24%36%21%1
700
16th to endNight
10%8%30%33%16%1
720
December1st to 15thNight
16%6%27%32%15%1
720
16th to endNight
17%8%25%31%16%
768
Page generated at 2017-09-24 09:15:51. Version ac04

Copyright 2017 A. Danko


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