Fayetteville(AR)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fayetteville(AR) clear sky chart from 2005-11-06 to 2024-01-13.

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
41%
24247
24%
74694
15%
24183
51%
24183
30%
44549

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
27%
950
25%
2458
8%
946
39%
946
28%
1573
January11th to 20thNight
21%
911
24%
2367
7%
911
33%
911
29%
1514
January21st to endNight
25%
990
29%
2574
8%
990
39%
990
32%
1604
February1st to 10thNight
22%
900
19%
2340
5%
900
30%
900
26%
1578
February11th to 20thNight
16%
879
18%
2274
4%
875
26%
875
26%
1512
February21st to endNight
19%
463
25%
1647
9%
463
38%
463
19%
1029
March1st to 10thNight
28%
540
24%
1980
12%
540
42%
540
22%
1186
March11th to 20thNight
26%
540
19%
1980
12%
540
36%
540
20%
1253
March21st to endNight
23%
594
17%
2178
9%
594
35%
594
19%
1398
April1st to 10thNight
27%
540
23%
1881
12%
540
43%
540
26%
1071
April11th to 20thNight
31%
533
24%
1775
15%
533
45%
533
26%
1043
April21st to endNight
26%
540
20%
1800
8%
540
43%
540
24%
1122
May1st to 10thNight
39%
540
21%
1625
15%
540
48%
540
29%
1000
May11th to 20thNight
48%
531
20%
1594
16%
531
55%
531
30%
976
May21st to endNight
48%
584
18%
1746
13%
582
56%
582
30%
1077
June1st to 10thNight
68%
540
21%
1620
21%
540
71%
540
42%
872
June11th to 20thNight
63%
540
23%
1620
19%
540
68%
540
46%
839
June21st to endNight
72%
540
26%
1620
24%
540
76%
540
51%
799
July1st to 10thNight
76%
525
18%
1575
19%
525
78%
525
38%
894
July11th to 20thNight
78%
522
24%
1566
26%
522
80%
522
50%
787
July21st to endNight
76%
591
26%
1673
29%
558
78%
558
42%
914
August1st to 10thNight
75%
537
23%
1601
25%
534
77%
534
41%
874
August11th to 20thNight
74%
534
26%
1630
30%
534
76%
534
38%
921
August21st to endNight
76%
594
27%
1980
30%
594
79%
594
40%
1022
September1st to 10thNight
70%
540
28%
1800
29%
540
73%
540
39%
936
September11th to 20thNight
67%
540
29%
1944
30%
540
71%
540
32%
1072
September21st to endNight
62%
548
32%
1988
31%
548
67%
548
37%
986
October1st to 10thNight
60%
720
30%
2160
21%
720
66%
720
44%
1136
October11th to 20thNight
38%
720
31%
2160
15%
720
51%
720
36%
1221
October21st to endNight
36%
792
27%
2376
16%
792
46%
792
30%
1432
November1st to 10thNight
37%
740
32%
2220
15%
740
52%
740
37%
1210
November11th to 20thNight
35%
797
29%
2317
15%
797
48%
797
36%
1331
November21st to endNight
30%
950
26%
2539
11%
950
41%
950
31%
1586
December1st to 10thNight
27%
950
24%
2660
9%
950
40%
950
28%
1696
December11th to 20thNight
26%
949
23%
2970
10%
948
35%
948
21%
1942
December21st to endNight
23%
1043
16%
4456
8%
1026
36%
1026
14%
3143

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
11%7%35%5%35%5%5%7%45%
74635
Night
10%6%3443445%7%50%
75108
TransparencyDay
38%7%11%23%17%4
74359
Night
34%6%11%24%20%5%
74904
SeeingDay
14%11%26%27%18%5%
14293
Night
14%10%30%30%14%1
24250

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
12%9%35%424346%47%
1707
11th to 20thDay
13%7%36%433436%46%
1638
21st to endDay
13%9%34333445%48%
1782
February1st to 10thDay
16%9%46%6%34345%40%
1620
11th to 20thDay
12%9%47%5%34446%42%
1578
21st to endDay
16%11%46%5%2434440%
1619
March1st to 10thDay
13%8%245%345%5%7%43%
1980
11th to 20thDay
18%9%36%5%35%5%45%40%
1980
21st to endDay
17%8%46%6%45%5%47%35%
2178
April1st to 10thDay
11%6%26%6%35%5%6%7%44%
2078
11th to 20thDay
16%7%26%435%5%5%6%41%
2134
21st to endDay
15%9%46%6%345%5%5%39%
2160
May1st to 10thDay
15%6%36%6%35%5%5%6%39%
2330
11th to 20thDay
12%6%26%5%35%6%6%8%41%
2302
21st to endDay
10%5%36%7%46%6%7%9%38%
2531
June1st to 10thDay
8%426%5%36%5%6%9%45%
2340
11th to 20thDay
6%325%5%45%6%8%10%46%
2340
21st to endDay
43145%35%5%7%10%54%
2340
July1st to 10thDay
9%5%36%6%36%6%8%10%37%
2340
11th to 20thDay
43245%35%6%8%9%50%
2340
21st to endDay
7%425%6%46%7%7%11%42%
2546
August1st to 10thDay
7%5%25%5%36%5%7%10%45%
2328
11th to 20thDay
9%425%5%45%5%7%8%45%
2270
21st to endDay
6%5%25%445%5%6%8%51%
2376
September1st to 10thDay
11%5%2433335%7%53%
2160
11th to 20thDay
11%5%245%345%6%7%48%
2012
21st to endDay
8%4244345%5%7%55%
1954
October1st to 10thDay
9%425%42445%8%53%
1800
11th to 20thDay
13%5%24323346%56%
1800
21st to endDay
17%5%245%23445%49%
1980
November1st to 10thDay
9%6%23433337%58%
1858
11th to 20thDay
11%6%2443345%5%52%
1862
21st to endDay
14%7%35%43345%7%46%
1632
December1st to 10thDay
12%8%35%5%25%5%4447%
1520
11th to 20thDay
11%10%36%6%34445%43%
2085
21st to endDay
11%15%8%6%6%25%45%6%31%
3135
January1st to 10thNight
12%6%345%3445%6%48%
2458
11th to 20thNight
13%7%35%423346%50%
2367
21st to endNight
12%7%35%423345%52%
2574
February1st to 10thNight
14%10%36%42435%6%43%
2340
11th to 20thNight
13%8%35%5%24446%46%
2273
21st to endNight
13%8%35%6%24446%44%
1647
March1st to 10thNight
13%6%45%43445%6%46%
1980
11th to 20thNight
16%8%36%5%2345%6%42%
1980
21st to endNight
14%7%35%6%35%45%5%43%
2178
April1st to 10thNight
11%6%2443346%6%51%
1881
11th to 20thNight
12%7%2432446%7%48%
1775
21st to endNight
15%5%25%435%46%6%45%
1800
May1st to 10thNight
10%6%34425%45%8%49%
1625
11th to 20thNight
11%5%144345%7%8%47%
1593
21st to endNight
9%4245%35%5%8%10%45%
1745
June1st to 10thNight
5%3244235%5%10%57%
1620
11th to 20thNight
42233335%7%11%58%
1620
21st to endNight
22123235%6%8%65%
1620
July1st to 10thNight
5%323436%5%7%11%51%
1620
11th to 20thNight
331332447%10%61%
1620
21st to endNight
5%3234345%6%10%54%
1772
August1st to 10thNight
32145%346%8%12%52%
1611
11th to 20thNight
6%413436%5%6%9%52%
1630
21st to endNight
4323435%5%5%9%57%
1980
September1st to 10thNight
8%41343345%8%57%
1800
11th to 20thNight
9%4245%34447%53%
1944
21st to endNight
8%423323447%59%
1988
October1st to 10thNight
6%31232445%8%60%
2160
11th to 20thNight
14%32331345%5%57%
2160
21st to endNight
16%6%23423345%52%
2376
November1st to 10thNight
10%5%23324245%60%
2220
11th to 20thNight
10%6%2332335%5%57%
2317
21st to endNight
14%6%2442435%6%51%
2539
December1st to 10thNight
13%9%34334446%48%
2660
11th to 20thNight
12%8%37%5%34445%45%
3103
21st to endNight
12%12%8%7%5%34445%35%
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
38%5%9%24%20%4
1708
11th to 20thDay
41%49%25%20%2
1638
21st to endDay
39%410%28%16%4
1782
February1st to 10thDay
48%5%9%20%14%4
1620
11th to 20thDay
43%5%10%22%17%3
1587
21st to endDay
47%5%7%17%16%8%
1619
March1st to 10thDay
41%6%7%19%18%9%
1980
11th to 20thDay
48%5%8%20%14%5%
1980
21st to endDay
50%6%10%20%12%1
2178
April1st to 10thDay
38%7%12%23%18%3
2078
11th to 20thDay
44%8%11%20%15%3
2134
21st to endDay
47%7%9%22%14%2
2160
May1st to 10thDay
45%8%10%21%15%1
2330
11th to 20thDay
40%10%13%24%12%1
2306
21st to endDay
41%10%15%22%11%
2531
June1st to 10thDay
35%9%15%26%14%2
2340
11th to 20thDay
31%9%16%28%14%2
2340
21st to endDay
25%8%16%30%18%4
2340
July1st to 10thDay
36%10%18%23%12%1
2276
11th to 20thDay
25%10%16%31%16%2
2271
21st to endDay
34%8%16%30%11%1
2405
August1st to 10thDay
31%11%18%25%13%1
2314
11th to 20thDay
34%8%13%26%18%1
2270
21st to endDay
31%9%14%25%16%5%
2376
September1st to 10thDay
32%5%11%27%17%8%
2160
11th to 20thDay
34%7%10%21%23%4
2012
21st to endDay
28%5%11%24%27%5%
1954
October1st to 10thDay
30%6%12%24%21%7%
1800
11th to 20thDay
30%5%7%23%27%8%
1800
21st to endDay
39%48%25%16%8%
1980
November1st to 10thDay
29%5%10%25%23%8%
1858
11th to 20thDay
34%5%7%23%22%10%
1862
21st to endDay
39%5%9%19%24%4
1632
December1st to 10thDay
40%5%9%24%18%4
1520
11th to 20thDay
44%46%18%24%3
2083
21st to endDay
52%7%8%17%13%3
3135
January1st to 10thNight
36%6%9%23%21%5%
2458
11th to 20thNight
37%410%26%20%3
2367
21st to endNight
35%38%27%21%5%
2574
February1st to 10thNight
43%410%23%15%4
2340
11th to 20thNight
40%5%8%25%17%4
2274
21st to endNight
42%5%8%18%20%8%
1647
March1st to 10thNight
39%6%8%18%20%9%
1980
11th to 20thNight
44%6%11%19%17%5%
1980
21st to endNight
43%7%9%24%14%3
2178
April1st to 10thNight
33%7%10%25%19%6%
1881
11th to 20thNight
35%6%10%24%20%5%
1775
21st to endNight
39%7%10%24%18%2
1800
May1st to 10thNight
35%8%13%23%19%2
1625
11th to 20thNight
33%9%17%24%16%2
1594
21st to endNight
32%10%19%26%13%1
1746
June1st to 10thNight
21%9%16%33%18%2
1620
11th to 20thNight
20%8%16%33%21%2
1620
21st to endNight
17%7%16%31%24%6%
1620
July1st to 10thNight
25%10%18%29%17%1
1575
11th to 20thNight
18%8%16%31%26%3
1566
21st to endNight
23%8%16%34%18%1
1673
August1st to 10thNight
22%10%16%36%15%1
1601
11th to 20thNight
25%10%15%24%23%3
1630
21st to endNight
23%7%14%28%23%4
1980
September1st to 10thNight
25%7%11%30%19%8%
1800
11th to 20thNight
31%6%10%22%25%5%
1944
21st to endNight
26%5%8%24%30%6%
1988
October1st to 10thNight
22%7%13%24%25%9%
2160
11th to 20thNight
29%6%7%20%29%9%
2160
21st to endNight
35%5%7%21%22%9%
2376
November1st to 10thNight
28%48%25%26%9%
2220
11th to 20thNight
30%48%24%26%8%
2317
21st to endNight
37%48%21%25%6%
2539
December1st to 10thNight
39%410%22%21%4
2660
11th to 20thNight
42%5%7%21%19%5%
3104
21st to endNight
52%6%8%17%14%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
21%19%37%18%6%
270
11th to 20thDay
22%25%36%14%3
246
21st to endDay
16%26%39%14%5%
264
February1st to 10thDay
23%21%37%16%3
240
11th to 20thDay
21%30%35%12%1
240
21st to endDay
33%27%29%11%1
198
March1st to 10thDay
21%24%33%20%3
240
11th to 20thDay
25%23%31%18%3
240
21st to endDay
25%26%36%9%3
264
April1st to 10thDay
17%25%33%17%6%2
338
11th to 20thDay
23%19%31%21%6%
412
21st to endDay
23%18%33%18%7%
420
May1st to 10thDay
17%14%37%26%6%
593
11th to 20thDay
16%10%31%29%12%2
625
21st to endDay
11%7%35%24%18%5%
679
June1st to 10thDay
9%419%36%24%8%
630
11th to 20thDay
5%422%38%25%5%
630
21st to endDay
3326%34%27%6%
630
July1st to 10thDay
8%116%31%32%12%
621
11th to 20thDay
4214%35%34%11%
618
21st to endDay
8%19%34%34%14%
684
August1st to 10thDay
9%212%40%30%6%
626
11th to 20thDay
11%310%35%33%8%
584
21st to endDay
7%210%32%36%13%
495
September1st to 10thDay
11%111%33%34%10%
450
11th to 20thDay
7%113%41%28%11%
302
21st to endDay
9%421%30%27%9%
270
October1st to 10thDay
12%6%31%30%17%4
270
11th to 20thDay
14%14%40%24%7%1
270
21st to endDay
28%14%30%22%5%1
297
November1st to 10thDay
13%14%40%22%9%2
270
11th to 20thDay
14%21%33%23%9%1
270
21st to endDay
20%20%32%21%7%
270
December1st to 10thDay
17%19%37%20%6%1
270
11th to 20thDay
21%20%37%16%6%1
270
21st to endDay
19%22%42%15%2
297
January1st to 10thNight
17%18%36%25%5%
950
11th to 20thNight
17%20%39%21%3
911
21st to endNight
17%16%39%24%4
990
February1st to 10thNight
19%17%38%22%3
900
11th to 20thNight
16%20%45%16%3
879
21st to endNight
20%19%38%21%2
463
March1st to 10thNight
19%14%36%27%4
540
11th to 20thNight
20%14%37%26%4
540
21st to endNight
19%14%41%20%6%
594
April1st to 10thNight
15%17%39%25%4
540
11th to 20thNight
16%14%37%26%7%
533
21st to endNight
17%12%43%19%9%1
540
May1st to 10thNight
13%9%36%33%8%
540
11th to 20thNight
15%6%28%34%16%1
531
21st to endNight
11%5%31%31%18%3
584
June1st to 10thNight
6%415%44%31%1
540
11th to 20thNight
4125%45%23%2
540
21st to endNight
3120%45%28%3
540
July1st to 10thNight
6%110%41%39%4
525
11th to 20thNight
4211%42%38%5%
522
21st to endNight
5%18%41%40%5%
591
August1st to 10thNight
3110%46%35%4
537
11th to 20thNight
7%210%46%30%4
534
21st to endNight
5%211%39%40%4
594
September1st to 10thNight
9%211%40%35%3
540
11th to 20thNight
12%111%42%30%5%
540
21st to endNight
9%320%37%28%3
548
October1st to 10thNight
8%423%37%25%3
720
11th to 20thNight
15%8%36%30%11%
720
21st to endNight
19%10%31%28%10%1
792
November1st to 10thNight
12%11%37%29%11%
740
11th to 20thNight
14%12%36%31%7%
797
21st to endNight
20%14%35%25%8%
950
December1st to 10thNight
18%14%36%26%5%
950
11th to 20thNight
19%14%36%26%5%
950
21st to endNight
18%18%38%22%4
1045
Page generated at 2024-01-10 00:25:06. Version ac07

Copyright 2024 Attilla Danko


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