Searcy
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Searcy clear sky chart from 2005-11-05 to 2017-08-12.

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
50%
15553
25%
46575
18%
15504
57%
15504
33%
27720

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
34%
900
28%
2327
11%
895
44%
895
32%
1495
January16th to endNight
30%
960
27%
2496
10%
960
40%
960
32%
1604
February1st to 15thNight
31%
833
21%
2235
8%
827
39%
827
30%
1451
February16th to endNight
31%
631
27%
1893
12%
631
42%
631
31%
1129
March1st to 15thNight
31%
561
21%
2001
13%
561
40%
561
23%
1239
March16th to endNight
41%
576
20%
2085
17%
576
48%
576
24%
1279
April1st to 15thNight
40%
539
25%
1797
17%
539
53%
539
33%
992
April16th to endNight
43%
540
25%
1800
19%
540
55%
540
31%
1042
May1st to 15thNight
51%
539
19%
1788
16%
539
59%
539
26%
1117
May16th to endNight
57%
563
23%
1594
19%
561
61%
561
32%
1009
June1st to 15thNight
79%
540
25%
1440
21%
540
81%
540
49%
795
June16th to endNight
77%
540
29%
1440
25%
540
80%
540
47%
807
July1st to 15thNight
77%
510
19%
1500
19%
510
79%
510
36%
875
July16th to endNight
81%
564
25%
1594
28%
531
82%
531
43%
859
August1st to 15thNight
79%
527
24%
1647
28%
524
80%
524
42%
856
August16th to endNight
77%
525
23%
1750
30%
525
77%
525
33%
999
September1st to 15thNight
69%
495
26%
1650
29%
495
71%
495
30%
970
September16th to endNight
67%
569
31%
1787
28%
569
71%
569
36%
1006
October1st to 15thNight
63%
660
33%
1980
27%
660
66%
660
39%
1102
October16th to endNight
54%
704
35%
2112
25%
704
63%
704
41%
1140
November1st to 15thNight
50%
700
31%
2147
23%
700
60%
700
38%
1183
November16th to endNight
41%
720
27%
2340
19%
720
51%
720
29%
1382
December1st to 15thNight
37%
897
21%
2517
12%
897
44%
897
28%
1646
December16th to endNight
34%
960
23%
2655
11%
960
43%
960
28%
1743

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%42443445%7%44%
47372
Night
13%424423346%50%
46778
TransparencyDay
38%5%10%22%18%4
47073
Night
34%49%23%21%5%
46582
SeeingDay
12%317%26%26%12%
5569
Night
15%424%32%20%2
15554

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
20%5%2432323447%
1611
16th to endDay
17%424423335%47%
1728
February1st to 15thDay
16%5%25%32334447%
1618
16th to endDay
18%6%346%24346%40%
1580
March1st to 15thDay
21%5%24324345%42%
1968
16th to endDay
16%7%245%35%34441%
2135
April1st to 15thDay
14%5%24433346%47%
2151
16th to endDay
16%5%25%5%35%446%41%
2160
May1st to 15thDay
16%5%35%6%35%45%5%38%
2160
16th to endDay
9%5%35%6%36%6%7%9%37%
2519
June1st to 15thDay
43245%35%7%7%10%44%
2520
16th to endDay
6%313436%5%8%10%45%
2520
July1st to 15thDay
6%426%6%48%7%7%8%35%
2365
16th to endDay
6%315%5%35%6%7%9%44%
2466
August1st to 15thDay
7%2145%45%6%8%10%43%
2215
16th to endDay
8%3145%45%7%7%9%42%
2100
September1st to 15thDay
12%5%245%35%45%8%42%
1980
16th to endDay
12%41341345%7%51%
1830
October1st to 15thDay
13%424423345%52%
1650
16th to endDay
15%312212335%58%
1760
November1st to 15thDay
12%5%23312226%57%
1710
16th to endDay
19%5%25%313335%46%
1620
December1st to 15thDay
20%5%23323336%44%
1440
16th to endDay
20%6%3442323443%
1566
January1st to 15thNight
18%6%2321233450%
2327
16th to endNight
16%5%3342333450%
2496
February1st to 15thNight
18%5%23412335%47%
2232
16th to endNight
15%42442223452%
1893
March1st to 15thNight
19%6%14423345%43%
2001
16th to endNight
17%5%35%423345%45%
2085
April1st to 15thNight
10%423423348%51%
1797
16th to endNight
11%3244245%5%6%49%
1800
May1st to 15thNight
16%32342445%7%44%
1787
16th to endNight
8%426%5%3445%8%45%
1593
June1st to 15thNight
3213225%47%11%56%
1440
16th to endNight
322332446%9%55%
1440
July1st to 15thNight
5%213435%6%7%12%46%
1590
16th to endNight
5%21232346%11%54%
1702
August1st to 15thNight
431342447%9%54%
1657
16th to endNight
6%312426%5%7%11%47%
1750
September1st to 15thNight
9%424435%45%7%47%
1650
16th to endNight
8%424434445%54%
1787
October1st to 15thNight
10%413323347%55%
1980
16th to endNight
13%2332222461%
2112
November1st to 15thNight
10%414413346%55%
2147
16th to endNight
18%41432333451%
2340
December1st to 15thNight
20%5%2442323445%
2517
16th to endNight
21%5%2431233446%
2655

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%26%25%17%5%
1612
16th to endDay
40%29%24%19%3
1728
February1st to 15thDay
40%310%25%16%3
1620
16th to endDay
45%38%20%17%3
1580
March1st to 15thDay
45%410%18%15%6%
1968
16th to endDay
46%412%24%11%1
2137
April1st to 15thDay
38%5%9%23%19%4
2151
16th to endDay
42%5%9%21%18%3
2160
May1st to 15thDay
47%5%11%16%18%1
2160
16th to endDay
41%7%14%21%13%
2523
June1st to 15thDay
32%8%14%26%18%
2520
16th to endDay
32%7%14%24%18%3
2520
July1st to 15thDay
41%9%12%20%12%3
2226
16th to endDay
33%8%13%26%16%2
2311
August1st to 15thDay
33%7%13%25%16%2
2201
16th to endDay
34%7%15%21%16%4
2100
September1st to 15thDay
39%7%11%17%16%8%
1980
16th to endDay
33%48%20%26%6%
1830
October1st to 15thDay
33%46%21%25%7%
1650
16th to endDay
30%3424%27%10%
1760
November1st to 15thDay
32%26%24%25%8%
1710
16th to endDay
41%37%19%22%5%
1620
December1st to 15thDay
42%311%22%16%4
1440
16th to endDay
46%39%19%16%4
1566
January1st to 15thNight
39%26%22%25%3
2327
16th to endNight
39%26%24%21%5%
2496
February1st to 15thNight
40%28%24%18%5%
2241
16th to endNight
36%28%26%17%7%
1893
March1st to 15thNight
43%39%16%19%7%
2001
16th to endNight
42%39%23%18%2
2085
April1st to 15thNight
31%310%25%21%6%
1797
16th to endNight
33%5%11%23%22%3
1800
May1st to 15thNight
39%6%11%20%17%5%
1788
16th to endNight
36%6%14%22%17%2
1595
June1st to 15thNight
21%6%13%30%25%2
1440
16th to endNight
24%5%12%27%25%5%
1440
July1st to 15thNight
27%9%16%28%14%3
1500
16th to endNight
23%6%16%29%20%3
1594
August1st to 15thNight
23%5%16%30%20%3
1647
16th to endNight
29%8%14%23%18%4
1750
September1st to 15thNight
34%5%11%21%16%9%
1650
16th to endNight
31%47%20%26%9%
1787
October1st to 15thNight
29%38%21%24%12%
1980
16th to endNight
28%25%19%33%10%
2112
November1st to 15thNight
29%36%24%26%10%
2147
16th to endNight
38%25%20%27%5%
2340
December1st to 15thNight
43%28%21%18%5%
2517
16th to endNight
42%28%21%19%4
2655

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
27%7%38%14%8%2
90
16th to endDay
18%9%44%19%7%
96
February1st to 15thDay
14%12%45%21%42
90
16th to endDay
19%12%38%20%7%1
81
March1st to 15thDay
30%10%34%21%4
90
16th to endDay
16%14%19%36%13%
121
April1st to 15thDay
12%9%34%27%13%2
270
16th to endDay
22%428%26%14%3
270
May1st to 15thDay
17%5%26%29%16%4
297
16th to endDay
11%421%32%22%7%
517
June1st to 15thDay
6%210%31%31%17%
495
16th to endDay
7%212%29%33%15%
495
July1st to 15thDay
6%111%31%36%13%
475
16th to endDay
5%321%41%26%
515
August1st to 15thDay
8%16%22%41%20%
400
16th to endDay
12%5%19%39%22%
268
September1st to 15thDay
12%18%15%39%22%
255
16th to endDay
11%11%24%31%19%
192
October1st to 15thDay
11%324%34%18%7%
90
16th to endDay
18%319%32%19%6%
96
November1st to 15thDay
13%326%30%23%3
90
16th to endDay
34%11%22%20%8%3
90
December1st to 15thDay
21%5%32%21%11%8%
90
16th to endDay
30%11%37%18%2
96
January1st to 15thNight
22%7%33%29%7%
900
16th to endNight
19%6%39%31%3
960
February1st to 15thNight
21%6%36%30%4
833
16th to endNight
17%10%37%31%3
631
March1st to 15thNight
22%6%34%32%3
561
16th to endNight
20%5%29%34%9%
576
April1st to 15thNight
12%6%36%33%10%
539
16th to endNight
12%5%33%34%13%1
540
May1st to 15thNight
17%322%39%15%1
540
16th to endNight
10%222%36%24%3
563
June1st to 15thNight
310%40%39%5%
540
16th to endNight
38%37%43%5%
540
July1st to 15thNight
5%6%36%43%7%
510
16th to endNight
6%425%51%11%
564
August1st to 15thNight
5%5%30%46%11%
527
16th to endNight
7%428%50%7%
525
September1st to 15thNight
11%110%27%43%5%
495
16th to endNight
9%212%34%37%3
569
October1st to 15thNight
13%217%33%30%3
660
16th to endNight
14%323%35%21%1
704
November1st to 15thNight
10%6%28%34%18%
700
16th to endNight
21%5%27%30%14%
720
December1st to 15thNight
22%6%28%33%8%
897
16th to endNight
24%6%30%31%5%
960
Page generated at 2017-08-13 13:16:14. Version ac04

Copyright 2017 A. Danko


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