Dothan
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dothan clear sky chart from 2005-11-05 to 2017-04-30.

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
56%
14993
24%
45657
19%
14950
62%
14950
31%
27617

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
38%
720
23%
2327
13%
716
51%
716
27%
1404
January16th to endNight
36%
768
26%
2319
15%
768
47%
768
26%
1456
February1st to 15thNight
42%
703
27%
2109
15%
700
53%
700
32%
1258
February16th to endNight
37%
631
26%
1893
13%
631
48%
631
29%
1170
March1st to 15thNight
44%
720
26%
2097
15%
720
53%
720
34%
1240
March16th to endNight
49%
768
26%
2112
15%
768
56%
768
35%
1262
April1st to 15thNight
53%
590
26%
1848
22%
590
59%
590
34%
1048
April16th to endNight
58%
537
28%
1791
24%
537
65%
537
37%
967
May1st to 15thNight
63%
494
27%
1485
19%
494
70%
494
37%
844
May16th to endNight
74%
513
22%
1538
20%
513
76%
513
35%
917
June1st to 15thNight
73%
495
16%
1485
15%
495
74%
495
30%
940
June16th to endNight
75%
495
16%
1485
14%
495
76%
495
28%
969
July1st to 15thNight
76%
465
12%
1395
12%
465
76%
465
29%
901
July16th to endNight
80%
522
12%
1483
13%
489
79%
489
28%
955
August1st to 15thNight
76%
494
12%
1638
15%
491
76%
491
24%
1086
August16th to endNight
68%
525
15%
1750
18%
525
68%
525
21%
1194
September1st to 15thNight
66%
624
15%
1779
15%
624
66%
624
23%
1238
September16th to endNight
62%
657
23%
1815
17%
657
66%
657
27%
1200
October1st to 15thNight
64%
660
33%
1815
25%
660
70%
660
41%
1039
October16th to endNight
60%
704
35%
2049
30%
704
67%
704
40%
1139
November1st to 15thNight
58%
700
32%
2268
29%
700
66%
700
39%
1197
November16th to endNight
50%
720
30%
2340
26%
720
61%
720
37%
1261
December1st to 15thNight
48%
720
26%
2340
22%
720
56%
720
31%
1351
December16th to endNight
42%
768
22%
2496
19%
768
49%
768
24%
1581

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%6%8%41%
46060
Night
9%4244345%5%8%46%
45861
TransparencyDay
38%6%11%18%18%7%
45763
Night
34%6%11%17%19%10%
45662
SeeingDay
11%312%22%27%23%
4783
Night
12%319%32%26%5%
14997

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
13%5%25%5%23347%44%
1611
16th to endDay
16%5%26%323446%45%
1902
February1st to 15thDay
12%5%3442435%7%46%
1750
16th to endDay
15%6%23424347%45%
1580
March1st to 15thDay
10%5%2442446%8%45%
1863
16th to endDay
12%5%1342435%6%48%
2111
April1st to 15thDay
12%4245%245%46%46%
2109
16th to endDay
7%4245%25%445%52%
2148
May1st to 15thDay
6%3345%35%47%9%44%
2136
16th to endDay
5%425%5%35%6%7%8%45%
2223
June1st to 15thDay
8%425%6%46%7%8%11%33%
2145
16th to endDay
3325%8%49%8%9%10%33%
2145
July1st to 15thDay
9%6%36%7%5%9%8%8%11%24%
2145
16th to endDay
7%5%36%6%48%7%9%12%28%
2265
August1st to 15thDay
8%7%37%8%5%7%8%9%9%24%
1980
16th to endDay
10%7%48%8%5%7%6%6%7%26%
2100
September1st to 15thDay
7%6%37%6%5%8%7%7%10%28%
1838
16th to endDay
10%6%35%6%446%6%7%39%
1815
October1st to 15thDay
9%415%43345%7%50%
1815
16th to endDay
9%312322346%60%
1823
November1st to 15thDay
9%312323447%56%
1588
16th to endDay
11%5%23323346%53%
1620
December1st to 15thDay
12%6%25%425%346%46%
1620
16th to endDay
18%7%46%424346%37%
1728
January1st to 15thNight
12%6%35%424346%45%
2327
16th to endNight
17%5%2442345%6%44%
2319
February1st to 15thNight
13%5%23423445%50%
2103
16th to endNight
13%5%245%24345%48%
1893
March1st to 15thNight
9%5%245%2346%6%49%
2097
16th to endNight
9%325%434336%53%
2112
April1st to 15thNight
10%324324447%50%
1848
16th to endNight
7%31433446%7%52%
1791
May1st to 15thNight
6%4234145%5%10%50%
1484
16th to endNight
5%325%435%7%5%8%49%
1538
June1st to 15thNight
5%435%5%46%7%7%11%39%
1485
16th to endNight
3426%6%47%7%8%11%37%
1485
July1st to 15thNight
6%325%446%8%9%14%35%
1485
16th to endNight
4216%5%37%8%10%12%37%
1592
August1st to 15thNight
5%4246%47%8%9%15%31%
1650
16th to endNight
10%6%26%6%45%7%8%9%32%
1750
September1st to 15thNight
9%5%25%6%46%7%7%10%33%
1779
16th to endNight
8%5%25%7%45%5%6%7%41%
1815
October1st to 15thNight
8%41332346%8%53%
1815
16th to endNight
8%413423345%58%
2049
November1st to 15thNight
8%313323446%56%
2268
16th to endNight
10%423313345%56%
2340
December1st to 15thNight
12%424323447%49%
2340
16th to endNight
17%6%25%424446%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%48%13%25%9%
1612
16th to endDay
40%35%15%24%10%
1902
February1st to 15thDay
37%37%15%24%10%
1752
16th to endDay
38%46%16%23%10%
1580
March1st to 15thDay
35%49%20%22%8%
1863
16th to endDay
35%49%19%22%8%
2112
April1st to 15thDay
37%47%19%20%10%
2109
16th to endDay
32%5%8%23%22%8%
2148
May1st to 15thDay
34%6%11%20%20%6%
2136
16th to endDay
32%7%14%25%17%3
2227
June1st to 15thDay
39%10%14%24%10%1
2145
16th to endDay
39%9%18%17%12%1
2145
July1st to 15thDay
45%12%23%14%3
2006
16th to endDay
42%11%21%17%7%
2111
August1st to 15thDay
48%10%19%15%5%
1968
16th to endDay
52%7%15%13%8%2
2100
September1st to 15thDay
46%11%13%13%12%2
1838
16th to endDay
40%7%10%16%18%6%
1815
October1st to 15thDay
31%49%20%22%12%
1815
16th to endDay
26%26%13%31%19%
1823
November1st to 15thDay
27%37%20%26%14%
1588
16th to endDay
32%36%17%23%16%
1620
December1st to 15thDay
38%38%19%21%8%
1620
16th to endDay
48%36%19%14%7%
1728
January1st to 15thNight
38%37%14%24%11%
2327
16th to endNight
40%35%14%24%11%
2319
February1st to 15thNight
35%35%15%24%14%
2112
16th to endNight
38%36%14%19%17%
1893
March1st to 15thNight
34%47%19%23%10%
2097
16th to endNight
32%48%19%23%11%
2112
April1st to 15thNight
32%49%16%24%13%
1848
16th to endNight
28%410%25%19%10%
1791
May1st to 15thNight
28%7%14%18%23%8%
1485
16th to endNight
29%8%15%20%19%6%
1540
June1st to 15thNight
33%10%19%23%11%1
1485
16th to endNight
36%9%19%19%12%2
1485
July1st to 15thNight
32%12%30%17%5%
1395
16th to endNight
32%13%27%19%6%
1483
August1st to 15thNight
36%13%26%18%21
1638
16th to endNight
42%10%19%14%10%2
1750
September1st to 15thNight
42%10%16%15%12%2
1779
16th to endNight
40%7%12%13%19%6%
1815
October1st to 15thNight
27%6%8%20%22%14%
1815
16th to endNight
29%2413%27%21%
2049
November1st to 15thNight
27%35%17%26%18%
2268
16th to endNight
29%37%15%23%20%
2340
December1st to 15thNight
35%48%19%24%8%
2340
16th to endNight
42%46%21%17%7%
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
15%8%32%24%11%7%
90
16th to endDay
15%15%31%25%11%1
96
February1st to 15thDay
8%13%40%21%15%1
90
16th to endDay
9%8%37%30%13%
81
March1st to 15thDay
12%8%36%27%14%
153
16th to endDay
12%420%35%22%3
288
April1st to 15thDay
14%6%20%28%25%3
270
16th to endDay
12%214%29%25%15%
266
May1st to 15thDay
9%117%25%27%18%
228
16th to endDay
8%422%33%31%
267
June1st to 15thDay
13%1312%28%40%
255
16th to endDay
4215%25%50%
255
July1st to 15thDay
8%25%31%51%
245
16th to endDay
7%18%26%55%
270
August1st to 15thDay
10%13%31%43%
253
16th to endDay
10%3112%34%36%
268
September1st to 15thDay
13%1315%35%29%
255
16th to endDay
15%17%23%38%14%
254
October1st to 15thDay
10%110%33%32%10%
255
16th to endDay
9%317%30%30%8%
272
November1st to 15thDay
14%323%31%19%7%
96
16th to endDay
5%8%27%33%13%11%
90
December1st to 15thDay
21%328%32%10%4
90
16th to endDay
32%418%20%19%4
96
January1st to 15thNight
16%7%31%32%10%1
720
16th to endNight
20%8%29%33%8%
768
February1st to 15thNight
14%7%30%37%9%
704
16th to endNight
15%6%35%35%7%
631
March1st to 15thNight
12%6%31%38%10%
720
16th to endNight
11%5%27%36%17%1
768
April1st to 15thNight
12%422%40%18%
590
16th to endNight
10%223%35%26%1
537
May1st to 15thNight
7%218%39%28%3
495
16th to endNight
5%18%30%45%7%
515
June1st to 15thNight
7%16%31%44%9%
495
16th to endNight
4321%52%17%
495
July1st to 15thNight
9%120%47%21%
465
16th to endNight
5%21%49%22%
522
August1st to 15thNight
6%17%51%22%
494
16th to endNight
12%1418%46%17%
525
September1st to 15thNight
12%1421%44%15%
624
16th to endNight
11%29%33%36%5%
657
October1st to 15thNight
11%115%33%34%3
660
16th to endNight
10%220%32%30%3
704
November1st to 15thNight
10%322%37%22%3
700
16th to endNight
14%5%25%35%18%1
720
December1st to 15thNight
14%426%35%16%2
720
16th to endNight
20%426%33%13%1
768
Page generated at 2017-04-30 19:40:07. Version ac04

Copyright 2017 A. Danko


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