Asheboro
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Asheboro clear sky chart from 2005-11-05 to 2018-03-11.

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
44%
16574
22%
49045
14%
16536
53%
16536
27%
30897

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%
777
23%
2522
10%
776
43%
776
21%
1531
January16th to endNight
25%
832
26%
2704
12%
832
43%
832
24%
1625
February1st to 15thNight
27%
762
21%
2482
9%
761
43%
761
24%
1473
February16th to endNight
23%
683
27%
1990
10%
683
41%
683
26%
1216
March1st to 15thNight
29%
764
25%
2101
12%
764
41%
764
28%
1304
March16th to endNight
32%
768
20%
2112
10%
768
40%
768
25%
1404
April1st to 15thNight
35%
718
23%
1874
10%
718
44%
718
31%
1178
April16th to endNight
41%
694
21%
1774
9%
694
47%
694
31%
1162
May1st to 15thNight
42%
540
17%
1620
8%
540
48%
540
26%
1052
May16th to endNight
59%
561
17%
1684
13%
561
61%
561
28%
1060
June1st to 15thNight
60%
540
15%
1620
13%
540
62%
540
25%
1071
June16th to endNight
67%
540
17%
1620
14%
540
69%
540
28%
1042
July1st to 15thNight
68%
510
12%
1530
11%
510
69%
510
26%
1029
July16th to endNight
70%
564
15%
1595
13%
531
71%
531
28%
1039
August1st to 15thNight
66%
539
15%
1609
14%
536
67%
536
24%
1094
August16th to endNight
66%
705
16%
1851
13%
705
67%
705
28%
1285
September1st to 15thNight
64%
720
22%
1880
18%
720
66%
720
33%
1224
September16th to endNight
53%
717
20%
1980
17%
717
56%
717
24%
1377
October1st to 15thNight
49%
720
27%
2154
25%
720
57%
720
30%
1333
October16th to endNight
45%
768
35%
2304
23%
768
63%
768
36%
1281
November1st to 15thNight
46%
760
28%
2281
19%
760
58%
760
34%
1326
November16th to endNight
43%
780
28%
2519
20%
780
55%
780
28%
1430
December1st to 15thNight
37%
780
23%
2535
13%
780
49%
780
23%
1592
December16th to endNight
31%
832
23%
2704
13%
832
43%
832
19%
1769

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
13%5%245%345%5%7%43%
49579
Night
13%5%2442445%7%45%
49242
TransparencyDay
38%7%11%20%17%4
49280
Night
37%6%11%20%19%5%
49045
SeeingDay
16%8%23%23%19%8%
6307
Night
16%8%24%30%18%2
16581

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%6%25%42444444%
1746
16th to endDay
15%413424335%50%
1872
February1st to 15thDay
16%5%33324446%44%
1710
16th to endDay
16%5%24323237%46%
1763
March1st to 15thDay
14%423323347%49%
2096
16th to endDay
17%5%24424435%45%
2111
April1st to 15thDay
10%413323449%51%
2074
16th to endDay
15%41443445%6%45%
2195
May1st to 15thDay
13%5%35%5%36%5%5%8%37%
2331
16th to endDay
11%425%6%35%5%6%7%41%
2431
June1st to 15thDay
10%425%6%346%7%10%40%
2340
16th to endDay
7%4246%46%6%6%9%41%
2340
July1st to 15thDay
9%5%26%6%46%7%7%9%34%
2340
16th to endDay
7%426%8%46%8%8%10%32%
2465
August1st to 15thDay
10%5%26%7%36%7%8%10%29%
2340
16th to endDay
11%6%35%7%46%7%6%9%31%
2339
September1st to 15thDay
10%324435%5%5%8%43%
2077
16th to endDay
19%7%25%42345%7%37%
1980
October1st to 15thDay
18%413312235%51%
1806
16th to endDay
12%414312235%57%
1920
November1st to 15thDay
15%413223335%54%
1907
16th to endDay
13%324424445%50%
1769
December1st to 15thDay
17%5%2442345%5%45%
1755
16th to endDay
19%6%24324446%41%
1872
January1st to 15thNight
15%5%14324445%47%
2522
16th to endNight
16%5%2332345%5%47%
2704
February1st to 15thNight
16%423323445%48%
2473
16th to endNight
13%423434445%49%
1990
March1st to 15thNight
14%324324345%49%
2101
16th to endNight
16%424425%446%43%
2112
April1st to 15thNight
12%41442345%6%49%
1874
16th to endNight
14%424424447%46%
1774
May1st to 15thNight
12%5%25%5%3445%8%41%
1619
16th to endNight
10%425%4345%410%43%
1682
June1st to 15thNight
10%5%345%35%5%6%10%38%
1620
16th to endNight
7%326%426%5%7%11%41%
1620
July1st to 15thNight
8%4246%46%6%8%11%36%
1620
16th to endNight
5%325%5%37%6%9%12%37%
1703
August1st to 15thNight
11%5%36%5%45%5%7%10%35%
1620
16th to endNight
7%6%25%6%35%6%6%12%35%
1851
September1st to 15thNight
10%4145%245%5%7%45%
1880
16th to endNight
17%6%25%5%2445%7%38%
1980
October1st to 15thNight
17%6%24323135%49%
2154
16th to endNight
11%41331332459%
2304
November1st to 15thNight
14%413213346%53%
2281
16th to endNight
12%42432335%6%51%
2519
December1st to 15thNight
15%5%24423445%45%
2535
16th to endNight
19%7%25%423445%40%
2704

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
42%47%19%21%5%
1747
16th to endDay
36%37%21%21%8%
1872
February1st to 15thDay
39%5%8%21%20%5%
1712
16th to endDay
38%410%22%19%4
1763
March1st to 15thDay
35%5%8%22%21%6%
2096
16th to endDay
40%5%9%20%19%4
2112
April1st to 15thDay
30%411%25%20%7%
2074
16th to endDay
38%6%9%18%19%7%
2195
May1st to 15thDay
43%7%15%18%13%2
2331
16th to endDay
39%8%14%22%13%1
2435
June1st to 15thDay
36%9%17%21%13%
2340
16th to endDay
35%10%15%21%15%2
2340
July1st to 15thDay
41%12%15%17%9%2
2201
16th to endDay
39%11%19%18%10%
2310
August1st to 15thDay
44%11%15%17%9%
2327
16th to endDay
45%10%13%17%11%1
2339
September1st to 15thDay
36%8%12%19%17%4
2077
16th to endDay
45%5%9%17%18%2
1980
October1st to 15thDay
36%49%24%19%5%
1806
16th to endDay
31%26%22%28%8%
1920
November1st to 15thDay
33%48%18%27%8%
1907
16th to endDay
35%47%20%26%5%
1769
December1st to 15thDay
39%5%9%21%18%5%
1755
16th to endDay
43%411%19%17%3
1872
January1st to 15thNight
38%48%16%23%6%
2522
16th to endNight
38%37%21%23%6%
2704
February1st to 15thNight
37%39%21%22%5%
2482
16th to endNight
36%410%22%21%4
1990
March1st to 15thNight
35%49%21%21%7%
2101
16th to endNight
41%5%8%21%18%4
2112
April1st to 15thNight
34%5%9%21%23%6%
1874
16th to endNight
37%5%11%18%18%8%
1774
May1st to 15thNight
39%7%13%20%16%2
1620
16th to endNight
35%9%15%26%12%1
1684
June1st to 15thNight
39%9%15%20%13%1
1620
16th to endNight
34%11%15%21%13%3
1620
July1st to 15thNight
36%13%15%19%11%3
1530
16th to endNight
35%10%19%20%11%2
1595
August1st to 15thNight
41%9%18%17%11%1
1609
16th to endNight
38%11%18%20%8%1
1851
September1st to 15thNight
35%7%15%18%17%5%
1880
16th to endNight
45%7%10%14%19%3
1980
October1st to 15thNight
38%38%21%22%5%
2154
16th to endNight
30%36%20%27%11%
2304
November1st to 15thNight
32%47%18%24%11%
2281
16th to endNight
32%46%19%26%9%
2519
December1st to 15thNight
40%5%9%19%19%5%
2535
16th to endNight
45%48%18%18%4
2704

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%24%35%17%1
135
16th to endDay
15%27%35%13%7%
144
February1st to 15thDay
22%21%44%9%2
135
16th to endDay
20%17%37%20%3
195
March1st to 15thDay
16%18%36%20%7%
312
16th to endDay
19%13%36%20%10%
288
April1st to 15thDay
17%14%28%23%14%2
270
16th to endDay
20%427%28%14%5%
270
May1st to 15thDay
15%16%29%19%13%5%
288
16th to endDay
15%419%22%29%9%
331
June1st to 15thDay
12%315%30%27%10%
315
16th to endDay
11%219%26%26%12%
315
July1st to 15thDay
9%15%30%30%12%
305
16th to endDay
6%10%25%34%21%
326
August1st to 15thDay
14%312%25%28%15%
313
16th to endDay
13%11%26%29%18%
332
September1st to 15thDay
14%312%22%30%17%
315
16th to endDay
25%316%24%21%8%
314
October1st to 15thDay
21%319%26%19%9%
315
16th to endDay
12%9%23%26%20%7%
336
November1st to 15thDay
21%6%25%26%16%3
325
16th to endDay
9%16%23%24%22%3
149
December1st to 15thDay
20%15%37%21%5%
135
16th to endDay
25%20%36%12%4
144
January1st to 15thNight
18%17%30%26%7%
780
16th to endNight
20%13%35%25%3
832
February1st to 15thNight
20%14%35%27%1
764
16th to endNight
16%17%38%24%3
683
March1st to 15thNight
17%14%35%26%5%
764
16th to endNight
18%11%33%28%7%
768
April1st to 15thNight
16%15%31%27%9%
718
16th to endNight
16%8%30%33%11%
694
May1st to 15thNight
15%7%28%34%13%
540
16th to endNight
12%217%34%30%2
563
June1st to 15thNight
12%215%36%29%4
540
16th to endNight
8%13%35%37%3
540
July1st to 15thNight
10%110%35%38%3
510
16th to endNight
7%10%31%42%8%
564
August1st to 15thNight
12%8%35%37%6%
539
16th to endNight
11%17%31%41%6%
705
September1st to 15thNight
13%111%34%32%7%
720
16th to endNight
19%215%29%29%3
717
October1st to 15thNight
21%419%26%24%4
720
16th to endNight
13%9%26%27%19%2
768
November1st to 15thNight
16%6%26%30%16%2
760
16th to endNight
14%12%24%31%14%1
780
December1st to 15thNight
19%10%26%32%10%
780
16th to endNight
23%12%27%30%6%
832
Page generated at 2018-03-12 13:28:03. Version ac04

Copyright 2018 A. Danko


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