Fayetteville(AR)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fayetteville(AR) clear sky chart from 2005-11-05 to 2017-09-21.

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%
15749
24%
47132
15%
15702
51%
15702
32%
27883

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
24%
900
27%
2327
8%
895
37%
895
29%
1481
January16th to endNight
25%
960
28%
2496
8%
960
38%
960
33%
1528
February1st to 15thNight
21%
880
20%
2288
5%
876
31%
876
29%
1470
February16th to endNight
20%
604
25%
1866
7%
604
36%
604
26%
1127
March1st to 15thNight
26%
540
21%
1980
11%
540
40%
540
20%
1232
March16th to endNight
26%
576
17%
2112
11%
576
35%
576
20%
1345
April1st to 15thNight
27%
539
22%
1851
11%
539
43%
539
26%
1071
April16th to endNight
28%
540
21%
1800
10%
540
45%
540
26%
1088
May1st to 15thNight
39%
539
21%
1623
16%
539
48%
539
28%
1012
May16th to endNight
48%
563
19%
1685
15%
561
57%
561
31%
1028
June1st to 15thNight
65%
540
21%
1620
18%
540
70%
540
45%
850
June16th to endNight
68%
540
24%
1620
19%
540
74%
540
46%
838
July1st to 15thNight
71%
510
17%
1530
17%
510
73%
510
39%
859
July16th to endNight
80%
564
27%
1594
30%
531
82%
531
45%
842
August1st to 15thNight
77%
539
26%
1610
29%
536
78%
536
41%
875
August16th to endNight
74%
573
25%
1872
28%
573
77%
573
36%
1037
September1st to 15thNight
65%
540
26%
1836
28%
540
69%
540
33%
1022
September16th to endNight
62%
515
31%
1886
29%
515
69%
515
34%
979
October1st to 15thNight
51%
660
30%
1980
20%
660
58%
660
39%
1094
October16th to endNight
40%
704
31%
2112
17%
704
52%
704
37%
1174
November1st to 15thNight
37%
700
31%
2100
15%
700
51%
700
36%
1156
November16th to endNight
28%
863
27%
2346
12%
863
40%
863
31%
1453
December1st to 15thNight
27%
900
21%
2502
8%
900
37%
900
27%
1614
December16th to endNight
23%
960
25%
2496
8%
960
35%
960
25%
1708

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%5%25%5%3445%7%44%
47720
Night
9%5%2432445%7%51%
47327
TransparencyDay
38%6%11%23%15%3
47420
Night
32%6%11%25%19%4
47132
SeeingDay
11%7%24%28%21%6%
5784
Night
12%10%31%29%14%1
15750

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%7%24322346%49%
1611
16th to endDay
11%5%25%433346%50%
1728
February1st to 15thDay
12%8%45%5%24335%44%
1575
16th to endDay
10%8%35%5%24445%44%
1617
March1st to 15thDay
14%8%24425%447%40%
1980
16th to endDay
17%7%36%5%34446%37%
2110
April1st to 15thDay
12%6%25%5%35%45%6%43%
2097
16th to endDay
14%7%36%5%335%5%5%38%
2160
May1st to 15thDay
16%5%26%5%35%5%45%38%
2325
16th to endDay
10%5%25%5%36%5%6%8%39%
2430
June1st to 15thDay
6%325%5%36%5%6%8%44%
2340
16th to endDay
5%3145%35%6%8%11%45%
2340
July1st to 15thDay
8%5%26%7%36%6%8%9%35%
2340
16th to endDay
5%3146%36%6%8%11%42%
2466
August1st to 15thDay
7%4145%46%6%7%10%43%
2340
16th to endDay
7%425%446%5%6%8%44%
2330
September1st to 15thDay
13%5%2442335%7%46%
2121
16th to endDay
9%41343345%8%49%
1855
October1st to 15thDay
12%5%24322346%51%
1650
16th to endDay
10%424413335%57%
1760
November1st to 15thDay
9%423323346%54%
1758
16th to endDay
13%6%24423346%48%
1607
December1st to 15thDay
12%7%35%5%14435%44%
1452
16th to endDay
12%9%45%5%24345%42%
1728
January1st to 15thNight
12%5%24423335%51%
2327
16th to endNight
9%5%35%422245%54%
2496
February1st to 15thNight
11%8%35%324345%47%
2278
16th to endNight
9%5%24424346%49%
1866
March1st to 15thNight
13%6%35%42445%6%42%
1980
16th to endNight
15%6%245%2435%5%42%
2112
April1st to 15thNight
9%6%2442345%6%50%
1851
16th to endNight
12%5%2442436%7%47%
1800
May1st to 15thNight
10%5%233245%5%7%48%
1622
16th to endNight
9%31443448%9%45%
1683
June1st to 15thNight
322332245%9%59%
1620
16th to endNight
31122235%7%10%59%
1620
July1st to 15thNight
5%313325%5%7%11%50%
1620
16th to endNight
32233335%6%10%56%
1702
August1st to 15thNight
42134245%7%11%53%
1620
16th to endNight
4313436%6%6%9%50%
1872
September1st to 15thNight
9%42342435%7%51%
1836
16th to endNight
7%313423447%55%
1886
October1st to 15thNight
10%31231235%8%56%
1980
16th to endNight
10%41331234458%
2112
November1st to 15thNight
8%423323345%58%
2100
16th to endNight
13%6%23323245%52%
2346
December1st to 15thNight
12%7%34324347%46%
2502
16th to endNight
11%10%45%324345%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
36%49%26%19%3
1612
16th to endDay
36%49%28%17%4
1728
February1st to 15thDay
43%310%24%13%3
1576
16th to endDay
41%6%9%23%15%4
1617
March1st to 15thDay
43%6%9%19%15%6%
1980
16th to endDay
49%5%10%21%12%1
2112
April1st to 15thDay
39%6%12%21%16%2
2097
16th to endDay
47%7%10%17%15%2
2160
May1st to 15thDay
46%7%10%19%14%
2325
16th to endDay
41%9%14%22%11%
2434
June1st to 15thDay
35%8%13%26%15%
2340
16th to endDay
30%8%17%25%15%1
2340
July1st to 15thDay
38%9%15%26%8%
2201
16th to endDay
32%7%17%29%11%1
2311
August1st to 15thDay
32%9%16%22%16%1
2326
16th to endDay
35%8%14%23%13%4
2330
September1st to 15thDay
37%5%11%22%14%8%
2121
16th to endDay
31%6%11%25%21%4
1855
October1st to 15thDay
33%5%11%24%18%6%
1650
16th to endDay
30%38%27%23%7%
1760
November1st to 15thDay
30%410%26%19%8%
1758
16th to endDay
38%48%21%24%3
1607
December1st to 15thDay
41%410%23%16%2
1452
16th to endDay
43%5%8%23%15%4
1728
January1st to 15thNight
35%5%7%25%21%3
2327
16th to endNight
33%310%26%21%4
2496
February1st to 15thNight
38%410%26%16%4
2288
16th to endNight
35%5%11%25%17%4
1866
March1st to 15thNight
41%6%10%17%19%4
1980
16th to endNight
43%6%10%21%15%2
2112
April1st to 15thNight
32%7%10%24%19%4
1851
16th to endNight
36%6%10%24%18%3
1800
May1st to 15thNight
34%8%13%21%19%2
1623
16th to endNight
31%9%19%24%13%1
1685
June1st to 15thNight
21%7%16%31%21%1
1620
16th to endNight
19%8%15%30%21%4
1620
July1st to 15thNight
25%8%17%29%17%1
1530
16th to endNight
21%7%14%34%19%1
1594
August1st to 15thNight
22%8%14%30%20%2
1610
16th to endNight
26%8%15%25%19%4
1872
September1st to 15thNight
31%5%10%26%16%9%
1836
16th to endNight
28%5%9%25%25%5%
1886
October1st to 15thNight
26%6%12%22%22%9%
1980
16th to endNight
28%5%6%24%26%8%
2112
November1st to 15thNight
28%49%26%23%9%
2100
16th to endNight
35%47%22%24%5%
2346
December1st to 15thNight
38%5%10%22%18%4
2502
16th to endNight
43%48%20%17%4
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
21%14%41%15%7%
90
16th to endDay
6%33%38%15%6%
96
February1st to 15thDay
10%21%46%18%3
90
16th to endDay
14%29%34%18%2
81
March1st to 15thDay
15%26%43%14%
90
16th to endDay
15%22%29%26%6%
96
April1st to 15thDay
15%20%33%22%8%
216
16th to endDay
21%15%33%17%11%
270
May1st to 15thDay
17%10%36%26%7%1
462
16th to endDay
12%10%36%23%13%3
517
June1st to 15thDay
7%319%38%23%7%
495
16th to endDay
6%223%34%27%5%
495
July1st to 15thDay
9%19%36%28%5%
475
16th to endDay
6%5%30%40%17%
515
August1st to 15thDay
10%9%31%37%9%
493
16th to endDay
8%110%34%34%9%
370
September1st to 15thDay
11%111%30%34%12%
276
16th to endDay
6%14%35%22%20%
105
October1st to 15thDay
7%5%32%28%20%5%
90
16th to endDay
10%7%34%35%8%4
96
November1st to 15thDay
10%8%30%26%21%3
90
16th to endDay
23%23%32%15%5%
90
December1st to 15thDay
20%11%40%18%6%3
90
16th to endDay
15%18%47%16%1
96
January1st to 15thNight
18%19%35%21%4
900
16th to endNight
14%17%40%23%4
960
February1st to 15thNight
15%17%41%22%3
880
16th to endNight
14%17%45%20%2
604
March1st to 15thNight
18%12%38%25%4
540
16th to endNight
17%12%40%22%6%
576
April1st to 15thNight
12%17%40%23%5%
539
16th to endNight
14%11%43%19%10%
540
May1st to 15thNight
13%8%35%30%11%
540
16th to endNight
12%430%33%17%1
563
June1st to 15thNight
4220%45%25%1
540
16th to endNight
321%43%28%2
540
July1st to 15thNight
6%114%43%30%2
510
16th to endNight
45%37%46%5%
564
August1st to 15thNight
5%9%40%38%6%
539
16th to endNight
5%112%42%34%3
573
September1st to 15thNight
12%112%37%32%3
540
16th to endNight
9%118%35%29%4
515
October1st to 15thNight
12%428%30%20%3
660
16th to endNight
12%8%35%28%13%1
704
November1st to 15thNight
11%13%35%27%12%
700
16th to endNight
18%14%36%22%8%
863
December1st to 15thNight
18%15%35%25%5%
900
16th to endNight
18%15%40%21%4
960
Page generated at 2017-09-22 06:35:35. Version ac04

Copyright 2017 A. Danko


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