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 2018-02-14.

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%
16331
26%
48850
19%
16282
57%
16282
33%
29059

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
33%
975
26%
2522
11%
970
43%
970
32%
1626
January16th to endNight
31%
1040
27%
2704
10%
1040
42%
1040
33%
1724
February1st to 15thNight
31%
900
20%
2414
8%
894
39%
894
29%
1585
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
78%
539
24%
1685
28%
536
80%
536
41%
884
August16th to endNight
77%
573
24%
1910
30%
573
77%
573
32%
1096
September1st to 15thNight
70%
540
25%
1800
28%
540
72%
540
32%
1033
September16th to endNight
68%
621
33%
1950
30%
621
72%
621
37%
1083
October1st to 15thNight
63%
720
32%
2160
26%
720
66%
720
39%
1201
October16th to endNight
53%
768
37%
2304
25%
768
64%
768
42%
1224
November1st to 15thNight
49%
760
30%
2331
22%
760
58%
760
36%
1316
November16th to endNight
43%
780
29%
2535
21%
780
54%
780
30%
1470
December1st to 15thNight
38%
972
22%
2727
12%
972
46%
972
29%
1757
December16th to endNight
33%
1040
22%
2876
11%
1040
42%
1040
27%
1917

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%42442445%7%44%
49201
Night
13%424423346%50%
49053
TransparencyDay
38%5%10%22%18%4
48902
Night
34%49%23%21%5%
48857
SeeingDay
12%418%26%25%12%
6172
Night
15%424%32%20%2
16332

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%6%2432323446%
1746
16th to endDay
16%424423335%49%
1872
February1st to 15thDay
16%5%25%32334447%
1740
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
8%2146%35%5%7%10%42%
2263
16th to endDay
9%4245%35%7%6%9%41%
2292
September1st to 15thDay
12%4245%25%45%8%45%
2160
16th to endDay
11%41341345%7%51%
1996
October1st to 15thDay
12%424423346%52%
1800
16th to endDay
14%312212335%59%
1920
November1st to 15thDay
12%6%24312225%55%
1856
16th to endDay
18%5%25%313335%47%
1755
December1st to 15thDay
19%5%23323336%45%
1560
16th to endDay
20%6%3442334441%
1697
January1st to 15thNight
18%6%2332233449%
2522
16th to endNight
15%5%3342333451%
2704
February1st to 15thNight
19%5%23423335%46%
2411
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%53%
1695
16th to endNight
6%313425%5%7%11%46%
1910
September1st to 15thNight
9%42433445%7%50%
1800
16th to endNight
7%423434445%55%
1950
October1st to 15thNight
10%413323347%55%
2160
16th to endNight
12%2332222463%
2304
November1st to 15thNight
11%414413346%53%
2331
16th to endNight
17%41332333452%
2535
December1st to 15thNight
18%5%2442323446%
2727
16th to endNight
21%6%2431233444%
2876

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%4
1747
16th to endDay
38%29%24%20%4
1872
February1st to 15thDay
40%311%25%15%3
1742
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
34%7%13%25%16%2
2249
16th to endDay
36%7%14%21%15%3
2292
September1st to 15thDay
37%6%11%19%16%7%
2160
16th to endDay
31%5%10%21%25%5%
1996
October1st to 15thDay
33%5%7%23%23%6%
1800
16th to endDay
29%3424%27%10%
1920
November1st to 15thDay
34%26%24%23%7%
1856
16th to endDay
40%37%19%23%6%
1755
December1st to 15thDay
41%310%22%17%4
1560
16th to endDay
47%310%19%15%4
1697
January1st to 15thNight
39%27%22%23%3
2522
16th to endNight
38%26%24%22%6%
2704
February1st to 15thNight
41%28%24%17%4
2420
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
24%5%16%29%19%3
1685
16th to endNight
30%8%14%24%17%4
1910
September1st to 15thNight
33%5%10%24%17%9%
1800
16th to endNight
30%47%22%25%9%
1950
October1st to 15thNight
29%38%23%23%11%
2160
16th to endNight
27%25%20%34%10%
2304
November1st to 15thNight
31%36%24%24%9%
2331
16th to endNight
36%25%19%28%6%
2535
December1st to 15thNight
41%28%21%19%5%
2727
16th to endNight
44%38%21%18%3
2876

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
25%8%35%20%7%1
135
16th to endDay
15%9%41%23%9%
144
February1st to 15thDay
14%11%43%23%5%1
130
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
10%6%22%39%19%
416
16th to endDay
14%421%38%19%
332
September1st to 15thDay
11%10%16%35%24%
315
16th to endDay
9%9%24%33%21%
246
October1st to 15thDay
9%421%34%21%8%
135
16th to endDay
16%326%30%15%6%
144
November1st to 15thDay
17%428%25%21%2
135
16th to endDay
25%9%24%25%11%3
135
December1st to 15thDay
19%438%20%11%5%
135
16th to endDay
27%13%40%16%2
144
January1st to 15thNight
22%7%33%30%6%
975
16th to endNight
19%6%39%31%3
1040
February1st to 15thNight
22%6%36%30%4
900
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%
539
16th to endNight
7%428%50%6%
573
September1st to 15thNight
10%110%26%43%6%
540
16th to endNight
9%211%33%38%4
621
October1st to 15thNight
13%217%33%30%3
720
16th to endNight
13%326%33%21%1
768
November1st to 15thNight
11%6%28%34%17%
760
16th to endNight
20%5%27%31%15%
780
December1st to 15thNight
21%6%28%34%8%
972
16th to endNight
25%6%30%31%5%
1040
Page generated at 2018-02-15 09:58:48. Version ac04

Copyright 2018 A. Danko


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