Fayetteville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fayetteville clear sky chart from 2005-11-06 to 2024-03-18.

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
47%
24828
21%
79904
14%
24733
54%
24733
26%
49689

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 10thNight
32%
754
26%
3991
12%
737
48%
737
17%
2073
January11th to 20thNight
33%
754
25%
3975
12%
740
48%
740
15%
2287
January21st to endNight
30%
829
18%
4445
13%
814
49%
814
17%
2603
February1st to 10thNight
34%
760
21%
2470
13%
760
45%
760
26%
1526
February11th to 20thNight
22%
741
19%
2368
9%
739
36%
739
21%
1522
February21st to endNight
28%
628
26%
1727
12%
628
42%
628
28%
1113
March1st to 10thNight
32%
760
26%
2090
15%
760
42%
760
30%
1320
March11th to 20thNight
30%
752
21%
2068
10%
752
41%
752
25%
1380
March21st to endNight
34%
792
21%
2178
11%
792
43%
792
27%
1417
April1st to 10thNight
34%
720
23%
1875
9%
720
43%
720
31%
1184
April11th to 20thNight
41%
711
25%
1775
11%
711
48%
711
36%
1122
April21st to endNight
46%
720
24%
1800
11%
720
52%
720
37%
1142
May1st to 10thNight
43%
608
18%
1688
9%
608
48%
608
31%
1049
May11th to 20thNight
52%
531
16%
1592
10%
531
56%
531
25%
1043
May21st to endNight
64%
582
16%
1744
14%
582
65%
582
28%
1134
June1st to 10thNight
60%
540
15%
1620
13%
540
61%
540
26%
1068
June11th to 20thNight
61%
540
13%
1620
10%
540
63%
540
26%
1061
June21st to endNight
64%
540
15%
1620
12%
540
66%
540
26%
1083
July1st to 10thNight
64%
525
13%
1575
10%
525
65%
525
22%
1096
July11th to 20thNight
72%
522
12%
1566
10%
522
72%
522
27%
1023
July21st to endNight
66%
591
14%
1672
11%
558
68%
558
26%
1128
August1st to 10thNight
64%
537
11%
1600
10%
534
65%
534
23%
1107
August11th to 20thNight
64%
601
13%
1665
11%
601
65%
601
23%
1186
August21st to endNight
64%
792
15%
1980
10%
792
65%
792
26%
1419
September1st to 10thNight
68%
720
22%
1800
17%
720
68%
720
33%
1191
September11th to 20thNight
59%
720
21%
1926
18%
720
61%
720
28%
1286
September21st to endNight
49%
720
17%
2016
14%
720
53%
720
23%
1416
October1st to 10thNight
56%
720
24%
2160
22%
720
62%
720
32%
1312
October11th to 20thNight
51%
720
30%
2160
25%
720
62%
720
35%
1256
October21st to endNight
50%
792
31%
2376
23%
792
62%
792
37%
1328
November1st to 10thNight
48%
740
27%
2221
21%
740
58%
740
32%
1304
November11th to 20thNight
43%
760
27%
2280
18%
760
54%
760
30%
1361
November21st to endNight
45%
760
28%
2441
19%
760
57%
760
31%
1405
December1st to 10thNight
37%
760
22%
2470
13%
760
50%
760
23%
1597
December11th to 20thNight
40%
759
26%
2951
20%
758
51%
758
23%
1742
December21st to endNight
37%
827
17%
4399
15%
817
49%
817
16%
2405

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%6%8%44%
79110
Night
13%6%25%5%35%5%5%7%44%
80687
TransparencyDay
38%7%12%20%18%5%
78832
Night
38%6%11%19%19%6%
80484
SeeingDay
15%8%23%24%20%9%
14662
Night
15%7%24%33%18%2
24861

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 10thDay
16%434423336%52%
2836
11th to 20thDay
13%5%35%432345%54%
2840
21st to endDay
17%8%35%5%34445%43%
3124
February1st to 10thDay
15%6%25%5%245%5%6%44%
1710
11th to 20thDay
21%5%25%324446%45%
1692
21st to endDay
18%7%25%6%3445%6%41%
1727
March1st to 10thDay
15%6%24423346%49%
2090
11th to 20thDay
14%6%35%5%36%45%8%42%
2058
21st to endDay
15%6%35%6%35%45%7%41%
2178
April1st to 10thDay
10%42342445%8%54%
2083
11th to 20thDay
11%4235%35%45%7%50%
2134
21st to endDay
12%5%244345%5%7%50%
2160
May1st to 10thDay
9%5%26%6%35%5%6%9%45%
2286
11th to 20thDay
12%6%36%6%346%5%8%42%
2301
21st to endDay
9%5%36%6%46%6%7%10%40%
2531
June1st to 10thDay
10%5%36%6%46%7%7%8%39%
2340
11th to 20thDay
9%425%5%46%6%6%11%42%
2340
21st to endDay
7%436%6%46%7%8%11%38%
2340
July1st to 10thDay
8%5%36%6%5%7%7%8%11%35%
2340
11th to 20thDay
8%5%26%6%47%7%8%12%34%
2340
21st to endDay
5%5%36%6%47%7%9%12%35%
2547
August1st to 10thDay
10%6%37%7%48%8%8%11%30%
2327
11th to 20thDay
11%7%36%7%5%6%7%8%10%30%
2216
21st to endDay
11%6%27%7%45%6%8%10%34%
2376
September1st to 10thDay
8%3246%46%6%8%10%43%
2160
11th to 20thDay
12%6%26%5%35%46%8%43%
2030
21st to endDay
18%7%26%6%4446%6%38%
1944
October1st to 10thDay
16%6%25%43345%6%47%
1800
11th to 20thDay
12%5%2442335%6%55%
1800
21st to endDay
11%5%25%323236%56%
1980
November1st to 10thDay
14%5%24323346%54%
1857
11th to 20thDay
14%5%24424446%52%
1900
21st to endDay
13%6%245%2335%8%49%
1736
December1st to 10thDay
17%7%26%5%245%5%7%40%
1710
11th to 20thDay
15%5%24323245%54%
2153
21st to endDay
16%7%35%5%235%46%43%
3124
January1st to 10thNight
14%6%3442345%6%47%
4109
11th to 20thNight
13%7%26%5%35%5%5%6%43%
4120
21st to endNight
16%7%35%434445%44%
4532
February1st to 10thNight
17%5%245%24446%46%
2470
11th to 20thNight
19%6%25%5%3445%5%42%
2368
21st to endNight
15%6%3443445%6%45%
1727
March1st to 10thNight
15%6%26%42435%5%48%
2090
11th to 20thNight
15%425%5%46%5%6%7%41%
2068
21st to endNight
15%5%25%435%5%6%7%43%
2178
April1st to 10thNight
12%6%245%25%45%7%50%
1875
11th to 20thNight
11%4245%35%35%7%51%
1775
21st to endNight
11%424435%6%5%7%49%
1800
May1st to 10thNight
8%5%27%445%45%9%47%
1688
11th to 20thNight
11%8%25%5%45%5%5%9%41%
1592
21st to endNight
10%5%25%7%45%6%6%8%42%
1744
June1st to 10thNight
10%5%246%46%7%8%10%36%
1620
11th to 20thNight
11%5%35%6%46%5%7%11%38%
1620
21st to endNight
8%5%36%5%46%6%8%11%37%
1620
July1st to 10thNight
8%6%37%7%47%7%8%10%33%
1620
11th to 20thNight
6%426%6%37%7%8%13%37%
1620
21st to endNight
6%6%36%6%5%7%7%7%13%35%
1771
August1st to 10thNight
8%7%28%7%36%7%8%10%35%
1611
11th to 20thNight
9%6%27%8%46%7%8%11%32%
1665
21st to endNight
9%6%36%7%46%7%8%9%35%
1980
September1st to 10thNight
9%5%35%6%345%7%9%44%
1800
11th to 20thNight
12%5%36%6%45%5%6%8%41%
1926
21st to endNight
19%7%27%6%35%446%38%
2016
October1st to 10thNight
15%5%2442345%6%50%
2160
11th to 20thNight
12%5%24424346%54%
2160
21st to endNight
10%5%24423347%55%
2376
November1st to 10thNight
14%6%2442333455%
2221
11th to 20thNight
14%7%25%423447%49%
2280
21st to endNight
14%424425%35%6%51%
2441
December1st to 10thNight
17%7%25%5%2345%6%42%
2470
11th to 20thNight
17%7%25%42334449%
3042
21st to endNight
17%6%25%424446%46%
4532

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 10thDay
36%46%23%24%6%
2837
11th to 20thDay
35%45%19%30%8%
2840
21st to endDay
43%5%5%16%21%10%
3124
February1st to 10thDay
40%411%19%19%5%
1710
11th to 20thDay
41%47%17%23%7%
1701
21st to endDay
44%5%9%16%20%6%
1727
March1st to 10thDay
37%49%20%23%7%
2090
11th to 20thDay
41%7%9%20%17%7%
2058
21st to endDay
43%6%11%16%20%4
2178
April1st to 10thDay
29%412%22%25%7%
2083
11th to 20thDay
32%5%11%23%20%9%
2134
21st to endDay
33%8%12%23%19%5%
2160
May1st to 10thDay
35%8%15%22%18%3
2286
11th to 20thDay
41%7%14%22%14%2
2305
21st to endDay
38%10%16%21%15%1
2531
June1st to 10thDay
40%9%15%21%14%1
2340
11th to 20thDay
35%10%18%22%14%2
2340
21st to endDay
37%11%19%19%12%3
2340
July1st to 10thDay
37%12%20%19%10%3
2275
11th to 20thDay
36%13%23%18%7%2
2271
21st to endDay
35%13%21%23%8%1
2405
August1st to 10thDay
43%12%18%16%9%
2314
11th to 20thDay
45%12%17%16%9%1
2216
21st to endDay
41%10%19%19%9%3
2376
September1st to 10thDay
34%11%16%18%17%4
2160
11th to 20thDay
39%8%12%16%22%4
2030
21st to endDay
46%6%9%18%17%4
1944
October1st to 10thDay
38%5%10%21%23%3
1800
11th to 20thDay
31%5%10%25%24%6%
1800
21st to endDay
31%47%22%27%10%
1980
November1st to 10thDay
33%47%20%27%9%
1857
11th to 20thDay
34%48%21%25%9%
1900
21st to endDay
35%48%23%22%8%
1736
December1st to 10thDay
43%6%11%19%17%4
1710
11th to 20thDay
35%37%22%25%9%
2150
21st to endDay
41%5%7%21%23%2
3124
January1st to 10thNight
36%48%20%27%5%
4109
11th to 20thNight
41%5%8%15%24%7%
4120
21st to endNight
42%5%6%15%24%8%
4532
February1st to 10thNight
40%49%19%21%7%
2470
11th to 20thNight
44%49%15%21%7%
2370
21st to endNight
40%5%9%18%21%8%
1727
March1st to 10thNight
37%5%8%19%23%9%
2090
11th to 20thNight
41%7%9%16%20%8%
2068
21st to endNight
39%7%12%19%19%4
2178
April1st to 10thNight
35%5%10%18%24%8%
1875
11th to 20thNight
33%6%10%22%21%9%
1775
21st to endNight
33%6%12%24%20%5%
1800
May1st to 10thNight
34%7%15%22%18%4
1688
11th to 20thNight
41%7%14%22%15%1
1593
21st to endNight
36%10%15%24%12%2
1745
June1st to 10thNight
38%11%18%21%11%1
1620
11th to 20thNight
39%9%20%19%12%1
1620
21st to endNight
38%11%18%20%11%2
1620
July1st to 10thNight
41%13%16%20%9%2
1575
11th to 20thNight
34%13%25%19%7%1
1566
21st to endNight
38%12%21%19%10%
1672
August1st to 10thNight
41%12%20%20%6%
1600
11th to 20thNight
42%12%21%16%7%1
1665
21st to endNight
41%12%17%20%9%2
1980
September1st to 10thNight
35%9%16%20%15%6%
1800
11th to 20thNight
40%8%13%17%19%3
1926
21st to endNight
48%6%11%16%15%4
2016
October1st to 10thNight
35%5%9%21%23%5%
2160
11th to 20thNight
32%5%9%23%23%9%
2160
21st to endNight
30%48%20%26%11%
2376
November1st to 10thNight
35%46%17%27%12%
2221
11th to 20thNight
36%48%16%24%12%
2280
21st to endNight
34%5%7%21%26%9%
2441
December1st to 10thNight
42%6%11%17%18%6%
2470
11th to 20thNight
39%47%19%22%9%
3044
21st to endNight
40%47%22%25%3
4532

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 10thDay
15%20%37%23%4
270
11th to 20thDay
17%23%34%18%6%1
270
21st to endDay
18%20%39%17%6%
297
February1st to 10thDay
18%17%37%21%6%
270
11th to 20thDay
31%14%38%15%2
295
21st to endDay
23%16%34%20%7%
382
March1st to 10thDay
20%16%30%26%9%
460
11th to 20thDay
21%14%36%22%6%1
449
21st to endDay
21%12%33%23%10%1
462
April1st to 10thDay
18%17%28%24%11%2
420
11th to 20thDay
11%15%29%22%18%4
412
21st to endDay
15%11%27%24%20%3
420
May1st to 10thDay
11%14%34%22%14%5%
423
11th to 20thDay
14%419%28%26%10%
447
21st to endDay
14%5%14%25%25%17%
485
June1st to 10thDay
13%317%30%27%11%
450
11th to 20thDay
12%215%25%28%17%
450
21st to endDay
7%316%26%32%16%
450
July1st to 10thDay
10%26%25%34%22%
445
11th to 20thDay
9%19%23%38%21%
444
21st to endDay
5%210%30%40%14%
488
August1st to 10thDay
13%311%24%29%20%
446
11th to 20thDay
11%210%20%34%23%
439
21st to endDay
13%28%25%28%24%
495
September1st to 10thDay
10%211%25%26%26%
450
11th to 20thDay
14%412%26%30%14%
450
21st to endDay
20%420%25%23%7%
450
October1st to 10thDay
19%6%20%21%24%10%
450
11th to 20thDay
13%7%25%26%22%7%
450
21st to endDay
12%7%24%32%19%5%
495
November1st to 10thDay
19%7%23%29%16%5%
455
11th to 20thDay
17%8%33%30%11%2
460
21st to endDay
14%11%27%30%16%2
296
December1st to 10thDay
20%11%40%20%7%
270
11th to 20thDay
19%11%36%21%11%2
270
21st to endDay
22%13%34%19%10%3
297
January1st to 10thNight
19%11%33%29%7%1
760
11th to 20thNight
17%12%33%31%7%
760
21st to endNight
19%10%37%31%4
836
February1st to 10thNight
19%9%35%32%4
760
11th to 20thNight
22%14%38%24%1
743
21st to endNight
19%12%36%29%4
628
March1st to 10thNight
18%11%34%30%6%1
760
11th to 20thNight
16%12%37%27%7%1
752
21st to endNight
18%11%32%32%7%
792
April1st to 10thNight
16%12%34%31%7%
720
11th to 20thNight
13%11%32%33%12%
711
21st to endNight
13%6%30%40%9%
720
May1st to 10thNight
10%10%32%36%13%
608
11th to 20thNight
14%5%21%41%18%1
531
21st to endNight
11%215%38%33%2
584
June1st to 10thNight
11%217%44%23%3
540
11th to 20thNight
11%312%39%28%7%
540
21st to endNight
8%314%39%32%4
540
July1st to 10thNight
10%210%36%38%5%
525
11th to 20thNight
8%17%36%42%6%
522
21st to endNight
8%310%40%36%3
591
August1st to 10thNight
11%29%34%39%5%
537
11th to 20thNight
11%29%35%38%5%
601
21st to endNight
12%29%33%38%7%
792
September1st to 10thNight
11%28%33%40%6%
720
11th to 20thNight
15%113%31%36%5%
720
21st to endNight
22%5%16%30%24%3
720
October1st to 10thNight
18%417%28%29%5%
720
11th to 20thNight
14%5%25%31%23%3
720
21st to endNight
13%6%25%33%20%3
792
November1st to 10thNight
16%6%22%36%17%3
740
11th to 20thNight
17%8%27%33%14%1
760
21st to endNight
15%7%28%33%17%1
760
December1st to 10thNight
19%9%27%36%8%
760
11th to 20thNight
19%8%27%36%10%
760
21st to endNight
21%10%26%35%9%
836
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