Smithville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Smithville clear sky chart from 2005-11-06 to 2024-03-01.

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
46%
23749
21%
79627
16%
23647
52%
23647
24%
50835

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
25%
752
18%
4029
12%
737
36%
737
12%
2583
January11th to 20thNight
21%
760
20%
3991
9%
740
29%
740
9%
2661
January21st to endNight
22%
830
14%
4278
9%
814
35%
814
12%
2940
February1st to 10thNight
26%
760
18%
2280
11%
760
33%
760
19%
1628
February11th to 20thNight
20%
743
16%
2219
7%
740
28%
740
17%
1594
February21st to endNight
19%
628
18%
1884
8%
628
27%
628
18%
1361
March1st to 10thNight
30%
723
19%
2167
11%
723
37%
723
22%
1440
March11th to 20thNight
27%
720
18%
2020
9%
720
34%
720
21%
1417
March21st to endNight
34%
770
17%
2156
10%
770
39%
770
23%
1473
April1st to 10thNight
42%
540
27%
1800
18%
540
53%
540
29%
1037
April11th to 20thNight
40%
533
27%
1775
18%
533
53%
533
29%
1047
April21st to endNight
45%
540
23%
1708
17%
540
52%
540
28%
1050
May1st to 10thNight
45%
540
21%
1620
13%
540
53%
540
30%
1002
May11th to 20thNight
54%
531
18%
1593
13%
531
57%
531
27%
1004
May21st to endNight
67%
582
18%
1745
15%
582
69%
582
29%
1098
June1st to 10thNight
65%
540
19%
1620
16%
540
67%
540
32%
992
June11th to 20thNight
75%
540
20%
1620
17%
540
77%
540
43%
871
June21st to endNight
74%
540
20%
1475
17%
540
75%
540
36%
919
July1st to 10thNight
69%
525
15%
1472
13%
525
69%
525
29%
961
July11th to 20thNight
74%
522
18%
1566
17%
522
75%
522
32%
953
July21st to endNight
72%
591
19%
1672
18%
558
74%
558
29%
1071
August1st to 10thNight
73%
537
19%
1625
19%
534
73%
534
30%
1014
August11th to 20thNight
71%
534
17%
1776
20%
534
72%
534
29%
1081
August21st to endNight
73%
594
20%
1980
24%
594
73%
594
29%
1178
September1st to 10thNight
68%
595
22%
1855
22%
595
69%
595
29%
1131
September11th to 20thNight
60%
720
23%
1980
20%
720
61%
720
31%
1275
September21st to endNight
62%
720
30%
1980
23%
720
67%
720
39%
1167
October1st to 10thNight
63%
720
33%
1980
27%
720
66%
720
41%
1131
October11th to 20thNight
48%
720
29%
2017
21%
720
56%
720
32%
1249
October21st to endNight
46%
792
28%
2529
25%
792
55%
792
29%
1508
November1st to 10thNight
53%
740
27%
2406
27%
740
60%
740
32%
1371
November11th to 20thNight
41%
760
29%
2470
21%
760
54%
760
31%
1429
November21st to endNight
40%
760
25%
2470
19%
760
49%
760
26%
1522
December1st to 10thNight
30%
760
17%
2470
13%
760
37%
760
17%
1747
December11th to 20thNight
33%
759
22%
2946
16%
758
44%
758
19%
1875
December21st to endNight
27%
828
13%
4453
10%
817
37%
817
10%
3055

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
14%7%36%6%35%5%6%8%38%
79111
Night
14%8%36%5%3445%7%41%
80274
TransparencyDay
45%6%10%21%16%3
78834
Night
43%5%10%21%18%4
80071
SeeingDay
17%8%21%22%20%12%
13850
Night
17%7%23%30%20%3
23774

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
15%12%5%10%6%36%6%5%5%26%
2836
11th to 20thDay
21%9%412%5%25%335%29%
2840
21st to endDay
22%13%6%6%434445%29%
3316
February1st to 10thDay
19%12%5%6%5%2344434%
1900
11th to 20thDay
21%10%47%6%33446%31%
1848
21st to endDay
21%9%37%43345%6%35%
1570
March1st to 10thDay
15%9%36%5%4445%7%39%
1800
11th to 20thDay
19%9%47%5%35%346%33%
1939
21st to endDay
17%9%36%6%35%5%6%7%34%
2214
April1st to 10thDay
12%7%26%5%245%5%7%45%
2160
11th to 20thDay
14%7%36%5%3445%7%43%
2134
21st to endDay
12%7%46%6%35%5%6%7%39%
2250
May1st to 10thDay
14%5%345%35%46%9%42%
2340
11th to 20thDay
13%7%37%7%45%5%5%7%36%
2301
21st to endDay
9%5%36%7%46%5%6%10%38%
2531
June1st to 10thDay
9%6%35%5%46%5%6%10%40%
2340
11th to 20thDay
5%5%26%5%36%7%7%10%45%
2340
21st to endDay
6%425%6%47%7%8%13%39%
2468
July1st to 10thDay
8%6%36%7%5%7%7%8%10%32%
2430
11th to 20thDay
9%5%36%7%5%7%7%8%9%35%
2340
21st to endDay
9%5%26%7%47%7%8%11%33%
2547
August1st to 10thDay
7%6%35%6%48%8%9%11%33%
2298
11th to 20thDay
8%6%36%7%47%6%7%10%35%
2125
21st to endDay
11%5%25%6%5%6%7%8%10%34%
2376
September1st to 10thDay
12%5%36%6%45%6%7%8%39%
2085
11th to 20thDay
15%6%36%43445%6%42%
1980
21st to endDay
11%5%25%5%245%46%50%
1980
October1st to 10thDay
11%42443445%6%53%
1980
11th to 20thDay
12%5%145%43347%52%
1941
21st to endDay
16%6%2443445%6%46%
1823
November1st to 10thDay
12%5%24423347%55%
1672
11th to 20thDay
14%7%24424446%48%
1710
21st to endDay
15%9%35%425%445%45%
1710
December1st to 10thDay
21%11%46%5%3345%6%32%
1710
11th to 20thDay
15%12%46%7%34446%33%
2153
21st to endDay
18%13%5%6%6%245%5%7%28%
3124
January1st to 10thNight
17%12%46%6%34446%34%
4109
11th to 20thNight
20%10%5%7%7%4433434%
4120
21st to endNight
19%15%47%5%24346%31%
4336
February1st to 10thNight
20%9%47%5%34446%33%
2280
11th to 20thNight
23%9%37%5%34445%34%
2218
21st to endNight
23%10%47%434347%31%
1884
March1st to 10thNight
16%7%45%5%35%5%5%7%39%
2167
11th to 20thNight
19%8%36%6%25%45%6%36%
2020
21st to endNight
15%9%36%6%35%5%5%8%36%
2156
April1st to 10thNight
11%5%345%45%46%8%47%
1800
11th to 20thNight
15%6%2442345%7%48%
1775
21st to endNight
13%5%36%5%35%46%8%43%
1708
May1st to 10thNight
11%6%35%5%25%5%5%8%45%
1620
11th to 20thNight
11%6%25%5%35%5%6%9%43%
1592
21st to endNight
7%326%7%35%7%7%12%42%
1744
June1st to 10thNight
7%436%5%35%5%6%9%46%
1620
11th to 20thNight
422443447%13%53%
1620
21st to endNight
5%3346%35%6%7%12%45%
1475
July1st to 10thNight
8%6%27%5%45%6%8%11%39%
1516
11th to 20thNight
6%5%245%36%5%8%11%44%
1620
21st to endNight
6%5%25%6%47%8%8%10%38%
1771
August1st to 10thNight
5%5%26%7%5%6%5%7%9%43%
1636
11th to 20thNight
7%5%26%6%35%6%8%10%43%
1776
21st to endNight
8%426%5%35%5%7%12%44%
1980
September1st to 10thNight
10%6%26%5%345%6%7%45%
1855
11th to 20thNight
11%6%27%6%25%45%7%44%
1980
21st to endNight
9%425%42345%8%53%
1980
October1st to 10thNight
11%414423436%59%
1980
11th to 20thNight
15%5%25%423345%49%
2017
21st to endNight
15%8%2442345%6%47%
2529
November1st to 10thNight
11%6%24434346%53%
2406
11th to 20thNight
13%7%2442435%7%49%
2470
21st to endNight
15%8%45%42445%6%44%
2470
December1st to 10thNight
19%10%5%7%5%35%45%5%32%
2470
11th to 20thNight
17%10%47%424345%40%
3042
21st to endNight
15%11%5%9%7%45%5%5%7%27%
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
58%46%18%13%2
2837
11th to 20thDay
58%37%15%16%1
2840
21st to endDay
57%37%21%11%1
3316
February1st to 10thDay
54%46%17%16%2
1900
11th to 20thDay
55%46%17%14%3
1858
21st to endDay
52%38%15%16%5%
1570
March1st to 10thDay
46%5%7%19%18%5%
1800
11th to 20thDay
54%48%16%14%3
1939
21st to endDay
50%5%11%20%13%1
2214
April1st to 10thDay
38%5%11%24%18%4
2160
11th to 20thDay
41%46%21%24%4
2134
21st to endDay
43%5%9%26%15%2
2250
May1st to 10thDay
40%6%12%26%14%3
2340
11th to 20thDay
47%6%11%21%13%1
2305
21st to endDay
42%8%13%22%14%2
2531
June1st to 10thDay
39%7%13%24%16%2
2340
11th to 20thDay
33%8%17%23%17%2
2340
21st to endDay
35%9%17%21%14%4
2468
July1st to 10thDay
43%9%15%18%11%4
2365
11th to 20thDay
42%9%16%18%11%3
2271
21st to endDay
41%9%16%23%10%1
2405
August1st to 10thDay
40%11%17%20%9%2
2285
11th to 20thDay
43%9%13%20%14%2
2125
21st to endDay
42%10%13%19%13%3
2376
September1st to 10thDay
41%8%11%20%16%3
2085
11th to 20thDay
42%6%11%21%18%2
1980
21st to endDay
36%5%8%24%22%5%
1980
October1st to 10thDay
33%5%8%22%26%6%
1980
11th to 20thDay
33%38%22%26%8%
1941
21st to endDay
40%37%21%24%5%
1823
November1st to 10thDay
32%39%22%30%5%
1672
11th to 20thDay
38%36%23%24%6%
1710
21st to endDay
43%36%22%21%4
1710
December1st to 10thDay
54%35%21%14%3
1710
11th to 20thDay
51%5%7%19%16%2
2150
21st to endDay
54%5%9%20%10%2
3124
January1st to 10thNight
51%38%21%16%2
4109
11th to 20thNight
55%37%14%17%5%
4120
21st to endNight
56%37%18%15%1
4336
February1st to 10thNight
53%48%18%17%1
2280
11th to 20thNight
55%36%17%14%4
2219
21st to endNight
54%47%15%15%5%
1884
March1st to 10thNight
45%49%15%19%7%
2167
11th to 20thNight
49%5%8%21%14%2
2020
21st to endNight
46%5%11%23%13%2
2156
April1st to 10thNight
36%410%25%22%3
1800
11th to 20thNight
37%47%22%23%7%
1775
21st to endNight
39%5%10%29%16%1
1708
May1st to 10thNight
36%6%11%26%18%2
1620
11th to 20thNight
37%8%17%22%14%1
1593
21st to endNight
35%9%14%24%15%3
1745
June1st to 10thNight
35%7%13%28%15%2
1620
11th to 20thNight
24%7%20%31%16%3
1620
21st to endNight
30%10%16%27%14%5%
1475
July1st to 10thNight
37%9%17%20%13%3
1472
11th to 20thNight
31%10%18%22%14%5%
1566
21st to endNight
35%10%16%25%12%2
1672
August1st to 10thNight
35%8%16%28%12%1
1625
11th to 20thNight
35%8%20%21%15%1
1776
21st to endNight
33%9%15%26%14%3
1980
September1st to 10thNight
36%7%13%23%17%4
1855
11th to 20thNight
38%6%11%19%24%2
1980
21st to endNight
31%5%9%24%26%6%
1980
October1st to 10thNight
29%47%24%28%9%
1980
11th to 20thNight
37%47%22%22%7%
2017
21st to endNight
38%35%22%25%6%
2529
November1st to 10thNight
34%36%23%26%8%
2406
11th to 20thNight
36%27%21%26%7%
2470
21st to endNight
42%36%25%20%4
2470
December1st to 10thNight
54%48%18%14%2
2470
11th to 20thNight
46%36%21%21%3
3044
21st to endNight
56%48%18%13%1
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
24%17%35%17%6%1
270
11th to 20thDay
31%19%31%11%7%1
270
21st to endDay
22%16%42%16%4
297
February1st to 10thDay
30%16%32%16%7%
270
11th to 20thDay
35%13%37%10%41
270
21st to endDay
32%20%35%12%1
225
March1st to 10thDay
23%18%37%17%5%1
240
11th to 20thDay
26%15%33%18%8%1
379
21st to endDay
24%16%28%19%12%1
462
April1st to 10thDay
16%16%28%25%11%3
420
11th to 20thDay
17%12%25%28%16%2
412
21st to endDay
18%10%31%24%14%4
420
May1st to 10thDay
17%11%26%26%16%4
423
11th to 20thDay
14%7%21%24%21%12%
447
21st to endDay
13%316%25%24%19%
485
June1st to 10thDay
11%5%16%22%26%20%
450
11th to 20thDay
6%312%27%30%23%
450
21st to endDay
8%214%28%28%19%
578
July1st to 10thDay
11%38%25%27%26%
535
11th to 20thDay
12%37%20%31%27%
444
21st to endDay
10%110%18%31%30%
488
August1st to 10thDay
11%39%20%31%26%
446
11th to 20thDay
12%111%23%39%15%
439
21st to endDay
12%17%21%31%28%
495
September1st to 10thDay
14%18%19%35%23%
450
11th to 20thDay
15%310%18%32%22%
450
21st to endDay
15%313%26%29%14%
450
October1st to 10thDay
13%218%26%28%13%
450
11th to 20thDay
13%8%28%28%17%6%
450
21st to endDay
19%11%22%28%16%4
338
November1st to 10thDay
17%5%27%30%16%5%
270
11th to 20thDay
13%12%34%31%9%
270
21st to endDay
19%11%35%20%13%3
270
December1st to 10thDay
25%15%31%20%7%1
270
11th to 20thDay
22%13%30%21%13%1
270
21st to endDay
24%19%31%20%6%1
297
January1st to 10thNight
23%13%33%26%5%
760
11th to 20thNight
26%16%32%21%5%
760
21st to endNight
20%12%41%24%3
836
February1st to 10thNight
25%12%32%26%4
760
11th to 20thNight
29%14%34%22%2
743
21st to endNight
31%13%34%20%1
628
March1st to 10thNight
21%12%32%31%4
723
11th to 20thNight
23%10%35%23%8%1
720
21st to endNight
20%10%31%29%10%
770
April1st to 10thNight
14%8%33%34%11%
540
11th to 20thNight
18%7%31%32%12%1
533
21st to endNight
16%6%27%36%14%1
540
May1st to 10thNight
13%5%30%32%20%1
540
11th to 20thNight
14%320%36%23%5%
531
21st to endNight
9%113%36%33%8%
584
June1st to 10thNight
8%214%34%36%5%
540
11th to 20thNight
5%112%35%38%9%
540
21st to endNight
6%29%39%38%7%
540
July1st to 10thNight
11%17%27%40%14%
525
11th to 20thNight
8%18%27%44%13%
522
21st to endNight
9%26%30%43%10%
591
August1st to 10thNight
8%2427%48%10%
537
11th to 20thNight
9%18%31%45%7%
534
21st to endNight
10%26%26%47%10%
594
September1st to 10thNight
12%37%30%40%8%
595
11th to 20thNight
13%211%29%38%7%
720
21st to endNight
11%217%29%36%6%
720
October1st to 10thNight
12%316%31%31%7%
720
11th to 20thNight
18%5%22%36%18%2
720
21st to endNight
19%5%24%34%16%2
792
November1st to 10thNight
14%6%23%34%21%2
740
11th to 20thNight
17%8%30%33%11%1
760
21st to endNight
21%9%27%32%11%1
760
December1st to 10thNight
27%11%28%28%7%
760
11th to 20thNight
23%8%31%30%8%1
760
21st to endNight
26%14%28%27%6%
836
Page generated at 2024-02-27 05:30:17. Version ac07

Copyright © 2024 Attilla Danko.


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