North Platte
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the North Platte clear sky chart from 2005-11-06 to 2024-02-25.

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%
24821
23%
79979
13%
24725
51%
24725
32%
45804

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
36%
940
22%
4368
10%
926
48%
926
20%
2624
January11th to 20thNight
35%
947
24%
4321
12%
930
45%
930
24%
2225
January21st to endNight
31%
1034
16%
4560
9%
1023
43%
1023
22%
2539
February1st to 10thNight
28%
841
20%
2361
7%
841
38%
841
28%
1521
February11th to 20thNight
31%
744
22%
2218
10%
740
41%
740
31%
1345
February21st to endNight
30%
610
26%
1830
9%
610
45%
610
33%
1062
March1st to 10thNight
35%
720
24%
2160
10%
720
47%
720
34%
1252
March11th to 20thNight
33%
594
25%
2034
15%
594
45%
594
30%
1141
March21st to endNight
31%
594
16%
2120
9%
594
42%
594
23%
1294
April1st to 10thNight
26%
540
20%
1800
10%
540
40%
540
28%
1044
April11th to 20thNight
25%
533
20%
1759
9%
533
42%
533
25%
1046
April21st to endNight
35%
540
19%
1620
15%
540
45%
540
27%
1010
May1st to 10thNight
35%
540
17%
1620
12%
540
44%
540
29%
1024
May11th to 20thNight
36%
531
16%
1593
11%
531
42%
531
28%
1000
May21st to endNight
36%
582
15%
1641
6%
582
42%
582
25%
1120
June1st to 10thNight
51%
540
17%
1440
8%
540
55%
540
40%
848
June11th to 20thNight
40%
540
19%
1440
6%
540
45%
540
37%
880
June21st to endNight
56%
540
19%
1440
10%
540
60%
540
42%
865
July1st to 10thNight
54%
525
14%
1400
7%
525
57%
525
38%
853
July11th to 20thNight
61%
522
23%
1392
13%
522
66%
522
45%
792
July21st to endNight
65%
591
23%
1530
17%
558
69%
558
44%
881
August1st to 10thNight
65%
537
19%
1601
17%
534
69%
534
35%
941
August11th to 20thNight
63%
534
25%
1622
24%
534
70%
534
40%
906
August21st to endNight
61%
594
27%
1980
25%
594
70%
594
43%
1010
September1st to 10thNight
57%
540
28%
1818
25%
540
67%
540
41%
918
September11th to 20thNight
55%
540
29%
1980
26%
540
66%
540
38%
961
September21st to endNight
48%
540
30%
1980
25%
540
61%
540
39%
964
October1st to 10thNight
44%
540
31%
1980
23%
540
56%
540
31%
1052
October11th to 20thNight
46%
695
32%
2135
16%
695
59%
695
41%
1099
October21st to endNight
40%
990
29%
2574
12%
990
48%
990
41%
1493
November1st to 10thNight
44%
925
31%
2405
13%
925
52%
925
49%
1310
November11th to 20thNight
39%
950
32%
2470
13%
950
52%
950
42%
1440
November21st to endNight
44%
950
29%
2470
14%
950
53%
950
42%
1445
December1st to 10thNight
35%
950
26%
2499
9%
950
47%
950
40%
1470
December11th to 20thNight
37%
949
29%
3067
13%
948
48%
948
35%
1604
December21st to endNight
36%
1039
18%
4751
10%
1026
49%
1026
20%
2825

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
8%6%2443445%7%53%
78454
Night
7%6%25%43445%7%52%
80894
TransparencyDay
30%6%14%28%18%4
78162
Night
31%6%14%27%18%4
80709
SeeingDay
10%8%30%33%16%3
14721
Night
10%8%37%37%9%
24854

By Month

Percentage Cloud Cover SW (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
7%11%45%323445%52%
2538
11th to 20thDay
5%9%46%5%35%5%7%7%45%
2540
21st to endDay
46%47%43445%7%52%
2861
February1st to 10thDay
7%7%5%8%7%245%5%7%42%
1833
11th to 20thDay
5%8%37%5%3445%7%49%
1849
21st to endDay
7%7%35%433345%56%
1520
March1st to 10thDay
6%42442346%7%57%
1800
11th to 20thDay
10%7%33335%45%8%50%
1925
21st to endDay
11%9%46%5%345%5%9%41%
2234
April1st to 10thDay
11%6%23424447%53%
2160
11th to 20thDay
13%7%35%435%45%7%45%
2149
21st to endDay
14%6%2442345%7%49%
2340
May1st to 10thDay
13%5%25%5%345%6%8%46%
2340
11th to 20thDay
15%5%25%43345%9%44%
2302
21st to endDay
12%5%25%4345%6%8%46%
2631
June1st to 10thDay
6%31332346%9%58%
2520
11th to 20thDay
8%3244245%6%7%55%
2520
21st to endDay
43234245%5%8%60%
2520
July1st to 10thDay
6%213435%5%7%8%55%
2520
11th to 20thDay
5%3234246%6%7%58%
2520
21st to endDay
5%324435%6%7%9%53%
2698
August1st to 10thDay
6%5%25%435%6%9%9%46%
2328
11th to 20thDay
5%3243345%6%8%56%
2275
21st to endDay
6%32443446%7%59%
2376
September1st to 10thDay
8%41332345%6%60%
2140
11th to 20thDay
7%31443445%6%60%
1980
21st to endDay
9%413323336%62%
1980
October1st to 10thDay
13%423423346%58%
1980
11th to 20thDay
8%5%24323346%60%
1803
21st to endDay
11%6%24423336%57%
1782
November1st to 10thDay
45%23434448%58%
1673
11th to 20thDay
5%6%24333336%62%
1710
21st to endDay
7%7%34323346%58%
1710
December1st to 10thDay
6%7%35%5%34447%53%
1677
11th to 20thDay
6%6%245%33447%56%
1926
21st to endDay
13%13%35%5%34345%42%
2794
January1st to 10thNight
6%9%38%7%445%47%43%
4417
11th to 20thNight
37%36%5%345%5%7%52%
4430
21st to endNight
37%37%6%35%5%5%6%50%
4803
February1st to 10thNight
8%9%47%5%3446%7%43%
2361
11th to 20thNight
48%27%6%35%6%6%7%47%
2218
21st to endNight
5%6%26%5%2445%7%51%
1830
March1st to 10thNight
7%6%26%42445%6%53%
2160
11th to 20thNight
9%7%3442345%6%53%
2034
21st to endNight
11%8%35%5%2446%8%43%
2120
April1st to 10thNight
12%6%243245%6%9%47%
1800
11th to 20thNight
12%5%244345%6%7%47%
1759
21st to endNight
13%5%2445%45%5%8%45%
1620
May1st to 10thNight
11%6%25%436%5%6%9%44%
1620
11th to 20thNight
14%6%3442436%7%47%
1593
21st to endNight
15%5%26%5%246%7%9%40%
1641
June1st to 10thNight
6%3344345%6%10%53%
1440
11th to 20thNight
8%42443445%10%51%
1440
21st to endNight
4315%5%36%5%7%11%50%
1440
July1st to 10thNight
6%4245%346%6%10%49%
1440
11th to 20thNight
24145%346%7%10%54%
1440
21st to endNight
43245%35%6%7%10%52%
1620
August1st to 10thNight
44246%35%5%8%11%48%
1611
11th to 20thNight
5%3235%35%5%5%10%54%
1622
21st to endNight
44133245%6%6%61%
1980
September1st to 10thNight
7%42342336%7%59%
1818
11th to 20thNight
6%323333447%61%
1980
21st to endNight
8%413323336%63%
1980
October1st to 10thNight
13%414323446%56%
1980
11th to 20thNight
8%423324436%62%
2135
21st to endNight
9%6%2332345%5%59%
2574
November1st to 10thNight
441432445%7%62%
2405
11th to 20thNight
6%425%5%245%5%7%56%
2470
21st to endNight
6%6%2432445%7%56%
2470
December1st to 10thNight
5%7%35%42435%6%56%
2499
11th to 20thNight
5%5%2432445%6%58%
3271
21st to endNight
15%12%24423446%45%
4873

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
35%411%34%15%1
2539
11th to 20thDay
36%9%11%26%15%3
2540
21st to endDay
31%6%17%28%16%2
2861
February1st to 10thDay
41%5%15%21%13%4
1833
11th to 20thDay
36%5%13%25%17%4
1859
21st to endDay
30%414%28%19%5%
1520
March1st to 10thDay
27%5%14%27%23%5%
1800
11th to 20thDay
33%6%13%26%19%3
1925
21st to endDay
41%7%16%24%10%2
2234
April1st to 10thDay
31%5%17%27%16%4
2160
11th to 20thDay
39%6%14%23%15%4
2152
21st to endDay
35%5%12%29%17%2
2340
May1st to 10thDay
36%7%16%26%14%1
2340
11th to 20thDay
38%7%18%26%10%1
2306
21st to endDay
35%9%18%24%12%3
2631
June1st to 10thDay
22%7%20%34%14%2
2520
11th to 20thDay
26%7%14%26%19%7%
2520
21st to endDay
20%8%13%31%24%5%
2520
July1st to 10thDay
24%9%14%28%21%4
2451
11th to 20thDay
22%7%12%28%24%6%
2445
21st to endDay
23%9%18%31%18%2
2548
August1st to 10thDay
29%11%18%26%13%3
2314
11th to 20thDay
24%7%16%30%20%3
2275
21st to endDay
23%6%11%27%25%9%
2376
September1st to 10thDay
24%5%10%26%23%11%
2140
11th to 20thDay
24%6%10%26%28%6%
1980
21st to endDay
26%48%31%26%6%
1980
October1st to 10thDay
30%5%8%27%26%4
1980
11th to 20thDay
26%410%30%21%8%
1803
21st to endDay
30%411%28%21%6%
1782
November1st to 10thDay
25%413%30%22%6%
1673
11th to 20thDay
25%311%29%27%4
1710
21st to endDay
28%412%28%23%5%
1710
December1st to 10thDay
32%5%13%30%18%3
1677
11th to 20thDay
29%5%13%34%18%1
1924
21st to endDay
43%6%11%26%12%2
2794
January1st to 10thNight
40%6%12%25%15%1
4417
11th to 20thNight
31%5%18%26%19%1
4430
21st to endNight
34%7%15%28%16%1
4803
February1st to 10thNight
40%6%14%23%15%4
2361
11th to 20thNight
36%5%15%26%15%3
2218
21st to endNight
32%412%25%21%6%
1830
March1st to 10thNight
31%5%11%26%21%6%
2160
11th to 20thNight
32%6%10%26%21%5%
2034
21st to endNight
39%7%16%23%13%2
2120
April1st to 10thNight
33%7%15%24%17%4
1800
11th to 20thNight
36%6%14%25%15%3
1759
21st to endNight
37%7%14%26%15%2
1620
May1st to 10thNight
36%8%17%23%15%1
1620
11th to 20thNight
37%7%17%25%12%1
1594
21st to endNight
39%11%18%19%10%3
1642
June1st to 10thNight
26%8%24%28%12%2
1440
11th to 20thNight
30%8%16%25%15%7%
1440
21st to endNight
26%9%17%26%20%3
1440
July1st to 10thNight
29%9%18%28%15%3
1400
11th to 20thNight
22%9%15%28%20%5%
1392
21st to endNight
24%8%19%30%16%3
1530
August1st to 10thNight
27%11%21%26%12%4
1601
11th to 20thNight
25%9%15%29%20%3
1622
21st to endNight
21%8%12%26%24%9%
1980
September1st to 10thNight
24%5%10%25%26%10%
1818
11th to 20thNight
24%6%12%27%25%7%
1980
21st to endNight
24%5%9%27%29%6%
1980
October1st to 10thNight
30%5%10%25%25%5%
1980
11th to 20thNight
24%49%30%24%9%
2135
21st to endNight
28%412%24%23%9%
2574
November1st to 10thNight
22%5%12%30%23%8%
2405
11th to 20thNight
27%5%12%26%24%6%
2470
21st to endNight
28%411%29%23%5%
2470
December1st to 10thNight
29%414%29%19%4
2499
11th to 20thNight
27%412%38%18%1
3272
21st to endNight
40%5%11%31%12%1
4873

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
10%442%31%13%1
270
11th to 20thDay
11%12%33%38%5%1
270
21st to endDay
8%9%47%24%10%3
297
February1st to 10thDay
7%15%47%27%3
270
11th to 20thDay
11%9%45%26%7%2
270
21st to endDay
11%11%50%22%5%
210
March1st to 10thDay
9%14%36%28%12%2
240
11th to 20thDay
16%7%33%35%8%2
240
21st to endDay
18%14%40%18%9%2
320
April1st to 10thDay
11%17%39%24%8%
420
11th to 20thDay
17%19%31%27%6%
430
21st to endDay
18%12%32%26%11%1
600
May1st to 10thDay
13%10%34%31%11%2
603
11th to 20thDay
18%8%31%27%12%3
625
21st to endDay
15%9%30%28%16%2
679
June1st to 10thDay
7%5%25%31%23%9%
630
11th to 20thDay
7%7%34%36%14%2
630
21st to endDay
45%28%40%21%2
630
July1st to 10thDay
6%323%41%24%3
621
11th to 20thDay
5%322%43%23%4
618
21st to endDay
6%216%44%27%5%
684
August1st to 10thDay
8%316%43%25%4
626
11th to 20thDay
6%420%44%23%3
589
21st to endDay
5%324%41%20%6%
495
September1st to 10thDay
10%424%37%20%5%
430
11th to 20thDay
3417%40%28%7%
270
21st to endDay
14%8%28%30%19%1
270
October1st to 10thDay
17%6%21%32%19%6%
270
11th to 20thDay
9%11%36%32%9%4
270
21st to endDay
16%14%25%29%12%3
297
November1st to 10thDay
7%7%42%25%16%3
270
11th to 20thDay
8%9%41%28%11%2
270
21st to endDay
13%10%38%26%11%3
270
December1st to 10thDay
7%9%44%31%8%1
270
11th to 20thDay
12%13%35%31%9%
270
21st to endDay
14%14%39%27%5%1
297
January1st to 10thNight
8%9%39%35%8%
950
11th to 20thNight
7%11%42%32%7%1
950
21st to endNight
7%8%45%33%6%
1045
February1st to 10thNight
11%10%45%29%5%
841
11th to 20thNight
7%9%47%33%4
744
21st to endNight
9%11%45%31%5%
610
March1st to 10thNight
11%10%40%34%5%
720
11th to 20thNight
11%9%43%31%6%
594
21st to endNight
14%9%42%30%5%
594
April1st to 10thNight
15%12%44%28%1
540
11th to 20thNight
13%15%44%26%2
533
21st to endNight
16%12%33%31%8%
540
May1st to 10thNight
14%7%39%31%9%
540
11th to 20thNight
17%8%35%32%7%1
531
21st to endNight
16%7%35%32%9%
584
June1st to 10thNight
6%6%33%41%13%1
540
11th to 20thNight
11%7%39%33%10%
540
21st to endNight
5%432%50%9%
540
July1st to 10thNight
5%431%44%16%
525
11th to 20thNight
3229%52%14%1
522
21st to endNight
4222%54%17%1
591
August1st to 10thNight
4320%55%17%
537
11th to 20thNight
5%325%53%14%
534
21st to endNight
4229%50%15%1
594
September1st to 10thNight
9%328%47%13%1
540
11th to 20thNight
8%430%44%14%1
540
21st to endNight
11%6%32%38%12%1
540
October1st to 10thNight
15%7%31%35%11%
540
11th to 20thNight
10%10%32%37%11%1
695
21st to endNight
12%10%34%33%10%1
990
November1st to 10thNight
6%6%41%38%8%1
925
11th to 20thNight
8%8%40%36%7%
950
21st to endNight
8%7%36%37%11%
950
December1st to 10thNight
9%10%41%34%5%
950
11th to 20thNight
10%9%38%35%7%
950
21st to endNight
14%11%34%36%5%
1045
Page generated at 2024-02-22 05:05:45. Version ac07

Copyright 2024 Attilla Danko


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