Nebraska City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Nebraska City clear sky chart from 2005-11-06 to 2024-02-15.

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
42%
24743
22%
80090
14%
24643
50%
24643
29%
48679

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
33%
941
15%
4071
8%
926
44%
926
15%
2944
January11th to 20thNight
31%
949
22%
4014
11%
930
40%
930
17%
2555
January21st to endNight
27%
1034
14%
4505
8%
1023
37%
1023
15%
3139
February1st to 10thNight
27%
950
16%
2470
6%
950
33%
950
25%
1718
February11th to 20thNight
31%
895
19%
2326
7%
891
38%
891
31%
1519
February21st to endNight
31%
592
26%
1776
7%
592
46%
592
29%
1092
March1st to 10thNight
32%
550
24%
1990
13%
550
45%
550
26%
1147
March11th to 20thNight
35%
540
22%
1980
16%
540
44%
540
24%
1182
March21st to endNight
25%
594
14%
2178
8%
594
34%
594
17%
1489
April1st to 10thNight
30%
540
20%
1919
13%
540
42%
540
25%
1112
April11th to 20thNight
31%
533
25%
1702
16%
533
45%
533
26%
1030
April21st to endNight
35%
540
21%
1620
15%
540
47%
540
27%
1023
May1st to 10thNight
39%
540
17%
1620
13%
540
46%
540
25%
1055
May11th to 20thNight
42%
531
19%
1594
14%
531
50%
531
30%
978
May21st to endNight
44%
583
14%
1682
9%
582
48%
582
28%
1102
June1st to 10thNight
63%
540
25%
1440
14%
540
66%
540
45%
809
June11th to 20thNight
59%
540
24%
1440
11%
540
63%
540
46%
805
June21st to endNight
59%
540
24%
1440
11%
540
64%
540
49%
794
July1st to 10thNight
71%
525
18%
1553
13%
525
71%
525
44%
834
July11th to 20thNight
73%
522
22%
1566
17%
522
77%
522
50%
780
July21st to endNight
73%
591
26%
1673
24%
558
77%
558
50%
826
August1st to 10thNight
71%
537
22%
1601
24%
534
73%
534
41%
875
August11th to 20thNight
71%
534
30%
1600
32%
534
76%
534
46%
828
August21st to endNight
64%
594
29%
1843
29%
594
70%
594
44%
950
September1st to 10thNight
57%
540
26%
1850
22%
540
65%
540
37%
955
September11th to 20thNight
56%
540
30%
1980
30%
540
65%
540
38%
997
September21st to endNight
52%
540
31%
1980
26%
540
63%
540
38%
968
October1st to 10thNight
47%
669
27%
2109
18%
669
55%
669
35%
1181
October11th to 20thNight
36%
720
28%
2160
13%
720
47%
720
36%
1209
October21st to endNight
38%
792
25%
2376
14%
792
48%
792
31%
1397
November1st to 10thNight
44%
869
30%
2349
15%
869
55%
869
43%
1282
November11th to 20thNight
33%
950
28%
2526
10%
950
46%
950
36%
1504
November21st to endNight
34%
950
23%
2660
11%
950
43%
950
33%
1617
December1st to 10thNight
32%
950
20%
2660
8%
950
42%
950
30%
1661
December11th to 20thNight
33%
948
25%
3113
10%
948
43%
948
25%
1842
December21st to endNight
27%
1040
14%
4724
7%
1026
40%
1026
13%
3480

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%36%5%3445%7%43%
78448
Night
11%7%36%43445%7%47%
80681
TransparencyDay
42%313%26%15%2
78171
Night
39%212%27%17%3
80478
SeeingDay
14%7%27%31%17%4
14697
Night
14%7%31%35%12%1
24772

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
10%12%5%12%9%45%5%45%28%
2847
11th to 20thDay
10%11%5%8%5%37%6%5%7%34%
2850
21st to endDay
9%13%7%11%8%45%5%5%6%28%
3135
February1st to 10thDay
10%11%5%7%7%4446%7%35%
1710
11th to 20thDay
10%7%47%6%36%5%5%8%39%
1632
21st to endDay
11%8%36%7%44448%41%
1480
March1st to 10thDay
11%8%5%6%5%335%47%43%
1968
11th to 20thDay
15%9%47%434446%40%
1980
21st to endDay
17%10%48%7%35%45%5%32%
2178
April1st to 10thDay
16%6%25%434346%45%
2040
11th to 20thDay
16%6%26%5%35%45%6%40%
2206
21st to endDay
19%6%36%6%25%446%39%
2340
May1st to 10thDay
16%6%37%5%35%5%5%7%38%
2340
11th to 20thDay
15%5%26%6%345%6%7%41%
2302
21st to endDay
16%7%36%7%35%5%6%8%35%
2593
June1st to 10thDay
7%425%5%246%6%9%50%
2520
11th to 20thDay
8%4245%35%5%6%9%49%
2520
21st to endDay
7%426%5%46%6%6%7%47%
2520
July1st to 10thDay
8%4244245%7%9%50%
2357
11th to 20thDay
6%3244245%6%8%55%
2340
21st to endDay
5%4245%346%7%10%50%
2546
August1st to 10thDay
7%425%6%36%6%7%10%43%
2328
11th to 20thDay
9%4234345%6%9%50%
2301
21st to endDay
8%5%24435%5%5%7%53%
2512
September1st to 10thDay
13%414424446%54%
2106
11th to 20thDay
11%5%2442435%7%53%
1980
21st to endDay
11%42431435%6%57%
1980
October1st to 10thDay
15%5%2442335%7%50%
1832
11th to 20thDay
13%6%24323345%56%
1800
21st to endDay
13%7%25%5%2445%7%47%
1980
November1st to 10thDay
9%5%24424346%57%
1727
11th to 20thDay
10%6%26%5%34447%49%
1652
21st to endDay
13%8%35%43445%7%44%
1520
December1st to 10thDay
8%7%36%5%445%5%8%45%
1520
11th to 20thDay
9%9%38%7%345%6%8%38%
1918
21st to endDay
17%10%5%14%7%44445%25%
2888
January1st to 10thNight
9%9%5%16%8%445%5%7%30%
4108
11th to 20thNight
9%10%47%5%38%5%6%6%38%
4120
21st to endNight
13%14%5%9%5%3445%6%33%
4532
February1st to 10thNight
12%10%47%7%35%5%45%40%
2470
11th to 20thNight
10%7%36%5%345%6%7%43%
2325
21st to endNight
10%7%37%5%34446%48%
1776
March1st to 10thNight
9%8%45%424446%49%
1990
11th to 20thNight
14%9%27%423347%45%
1980
21st to endNight
18%10%46%5%35%446%33%
2178
April1st to 10thNight
12%6%35%5%3445%7%47%
1919
11th to 20thNight
12%7%35%5%3445%7%46%
1702
21st to endNight
18%7%24423446%45%
1620
May1st to 10thNight
15%6%26%5%45%5%5%7%40%
1620
11th to 20thNight
15%5%2443435%7%47%
1593
21st to endNight
15%5%36%5%345%5%7%42%
1681
June1st to 10thNight
5%3144245%7%9%55%
1440
11th to 20thNight
6%413325%5%8%9%53%
1440
21st to endNight
42143245%6%8%58%
1440
July1st to 10thNight
7%4244245%5%9%56%
1598
11th to 20thNight
32144245%6%9%61%
1620
21st to endNight
42134345%7%10%57%
1772
August1st to 10thNight
5%315%435%5%6%9%54%
1611
11th to 20thNight
8%31232446%8%59%
1600
21st to endNight
7%41332435%6%60%
1843
September1st to 10thNight
10%324433447%56%
1850
11th to 20thNight
9%31442445%7%57%
1980
21st to endNight
8%3243235%45%60%
1980
October1st to 10thNight
12%5%2432445%7%52%
2109
11th to 20thNight
13%5%23323346%56%
2160
21st to endNight
15%6%24324346%51%
2376
November1st to 10thNight
8%32342336%7%58%
2349
11th to 20thNight
11%5%24333447%53%
2526
21st to endNight
13%7%34423446%51%
2660
December1st to 10thNight
9%7%36%5%3445%7%47%
2660
11th to 20thNight
10%9%36%434346%49%
3279
21st to endNight
18%14%6%11%5%23335%31%
4774

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
59%212%19%8%1
2848
11th to 20thDay
52%214%23%9%
2850
21st to endDay
60%213%17%8%
3135
February1st to 10thDay
50%315%21%10%1
1710
11th to 20thDay
45%212%25%12%3
1641
21st to endDay
44%313%24%14%2
1480
March1st to 10thDay
43%313%26%14%2
1968
11th to 20thDay
47%39%26%14%1
1980
21st to endDay
56%313%20%8%1
2178
April1st to 10thDay
42%212%28%13%2
2040
11th to 20thDay
45%213%24%15%2
2206
21st to endDay
48%310%25%14%1
2340
May1st to 10thDay
47%314%20%14%1
2340
11th to 20thDay
43%415%26%12%1
2306
21st to endDay
48%315%21%11%2
2593
June1st to 10thDay
31%418%30%15%2
2520
11th to 20thDay
33%315%31%17%2
2520
21st to endDay
35%413%30%14%4
2520
July1st to 10thDay
30%315%34%15%3
2293
11th to 20thDay
28%314%28%21%5%
2271
21st to endDay
28%416%34%17%1
2405
August1st to 10thDay
35%420%27%12%2
2314
11th to 20thDay
30%414%32%19%1
2301
21st to endDay
32%410%28%21%6%
2512
September1st to 10thDay
33%210%29%20%5%
2106
11th to 20thDay
33%210%33%20%1
1980
21st to endDay
30%29%34%24%1
1980
October1st to 10thDay
36%211%27%22%1
1832
11th to 20thDay
33%28%28%25%5%
1800
21st to endDay
39%212%23%20%5%
1980
November1st to 10thDay
31%213%31%21%3
1727
11th to 20thDay
38%212%27%19%1
1652
21st to endDay
42%310%30%14%1
1520
December1st to 10thDay
40%216%28%13%1
1520
11th to 20thDay
46%216%29%7%
1915
21st to endDay
63%29%18%7%
2888
January1st to 10thNight
57%211%18%11%
4108
11th to 20thNight
49%113%26%11%1
4120
21st to endNight
56%214%18%9%1
4532
February1st to 10thNight
48%212%21%13%3
2470
11th to 20thNight
41%314%26%15%3
2326
21st to endNight
40%210%25%19%4
1776
March1st to 10thNight
38%310%30%16%3
1990
11th to 20thNight
42%39%26%18%3
1980
21st to endNight
53%312%21%9%2
2178
April1st to 10thNight
39%210%28%18%4
1919
11th to 20thNight
40%29%29%17%2
1702
21st to endNight
42%313%23%18%1
1620
May1st to 10thNight
45%312%24%14%2
1620
11th to 20thNight
39%314%26%18%1
1594
21st to endNight
43%317%22%12%3
1682
June1st to 10thNight
25%5%14%35%17%4
1440
11th to 20thNight
26%415%31%20%5%
1440
21st to endNight
24%315%32%22%4
1440
July1st to 10thNight
27%315%32%20%4
1553
11th to 20thNight
21%317%33%20%5%
1566
21st to endNight
21%315%37%21%3
1673
August1st to 10thNight
28%418%34%15%1
1601
11th to 20thNight
24%313%36%21%3
1600
21st to endNight
25%313%28%21%9%
1843
September1st to 10thNight
30%211%27%23%8%
1850
11th to 20thNight
29%210%35%21%3
1980
21st to endNight
27%27%31%29%3
1980
October1st to 10thNight
33%29%29%24%3
2109
11th to 20thNight
32%28%26%26%7%
2160
21st to endNight
36%211%23%26%3
2376
November1st to 10thNight
26%215%28%25%5%
2349
11th to 20thNight
34%211%31%20%3
2526
21st to endNight
37%211%28%20%2
2660
December1st to 10thNight
39%212%31%14%1
2660
11th to 20thNight
39%213%35%11%
3281
21st to endNight
60%29%21%8%1
4774

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
19%11%33%26%8%3
270
11th to 20thDay
21%13%30%27%9%
270
21st to endDay
14%9%42%27%7%1
297
February1st to 10thDay
17%13%45%21%4
270
11th to 20thDay
15%14%35%27%8%1
252
21st to endDay
13%14%41%27%5%
198
March1st to 10thDay
14%13%43%23%8%
240
11th to 20thDay
30%8%30%23%9%2
240
21st to endDay
24%17%32%22%41
264
April1st to 10thDay
23%9%40%23%5%
300
11th to 20thDay
21%10%34%25%10%1
484
21st to endDay
22%10%34%20%12%2
600
May1st to 10thDay
19%8%32%26%13%2
603
11th to 20thDay
19%5%29%29%15%2
625
21st to endDay
20%424%32%16%3
679
June1st to 10thDay
6%420%29%31%10%
630
11th to 20thDay
9%227%35%21%6%
630
21st to endDay
8%430%36%18%4
630
July1st to 10thDay
9%114%32%32%12%
621
11th to 20thDay
6%218%40%25%8%
618
21st to endDay
8%212%42%31%5%
684
August1st to 10thDay
8%215%42%28%6%
626
11th to 20thDay
9%215%41%27%6%
615
21st to endDay
10%217%37%28%8%
631
September1st to 10thDay
13%222%36%20%7%
396
11th to 20thDay
8%224%36%20%11%
270
21st to endDay
17%427%34%16%3
270
October1st to 10thDay
21%6%23%27%14%9%
270
11th to 20thDay
9%15%40%25%9%1
270
21st to endDay
19%14%32%23%8%4
297
November1st to 10thDay
16%8%36%29%9%3
270
11th to 20thDay
17%13%40%22%9%
270
21st to endDay
23%10%31%27%9%1
270
December1st to 10thDay
9%12%37%31%8%3
270
11th to 20thDay
18%11%31%30%11%
270
21st to endDay
22%13%37%24%4
297
January1st to 10thNight
12%10%35%34%8%1
950
11th to 20thNight
15%13%33%31%8%
950
21st to endNight
18%8%38%31%6%
1045
February1st to 10thNight
17%11%37%30%5%
950
11th to 20thNight
14%9%40%32%6%
895
21st to endNight
13%12%40%28%7%1
592
March1st to 10thNight
13%11%38%30%7%
550
11th to 20thNight
20%6%33%34%7%
540
21st to endNight
25%8%35%26%6%
594
April1st to 10thNight
17%12%38%27%6%
540
11th to 20thNight
16%11%36%32%41
533
21st to endNight
20%7%34%30%9%1
540
May1st to 10thNight
17%7%29%37%9%1
540
11th to 20thNight
17%6%28%37%11%1
531
21st to endNight
16%425%37%17%1
584
June1st to 10thNight
6%321%48%21%1
540
11th to 20thNight
8%127%46%18%1
540
21st to endNight
5%327%46%19%
540
July1st to 10thNight
8%110%42%36%2
525
11th to 20thNight
3116%48%29%2
522
21st to endNight
4114%52%28%2
591
August1st to 10thNight
6%114%51%25%3
537
11th to 20thNight
8%313%49%24%3
534
21st to endNight
9%118%42%27%3
594
September1st to 10thNight
12%324%37%22%3
540
11th to 20thNight
10%325%40%21%2
540
21st to endNight
12%327%40%17%1
540
October1st to 10thNight
15%429%34%15%2
669
11th to 20thNight
16%8%35%33%8%
720
21st to endNight
20%9%30%33%8%1
792
November1st to 10thNight
10%9%33%37%11%
869
11th to 20thNight
15%11%37%29%8%
950
21st to endNight
17%9%35%30%9%
950
December1st to 10thNight
14%11%36%32%7%
950
11th to 20thNight
17%8%32%34%8%
950
21st to endNight
20%11%35%29%5%
1045
Page generated at 2024-02-12 05:35:37. Version ac07

Copyright 2024 Attilla Danko


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