Jefferson City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jefferson City clear sky chart from 2005-11-06 to 2024-03-23.

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
36%
24700
20%
80593
13%
24591
45%
24591
24%
51396

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
20%
943
15%
4265
6%
926
31%
926
12%
2896
January11th to 20thNight
19%
950
16%
4048
6%
930
30%
930
11%
2948
January21st to endNight
20%
1037
13%
4478
5%
1023
30%
1023
12%
3239
February1st to 10thNight
18%
950
16%
2470
4%
950
25%
950
19%
1788
February11th to 20thNight
20%
864
18%
2339
4%
860
28%
860
22%
1576
February21st to endNight
16%
628
20%
1884
5%
628
28%
628
19%
1251
March1st to 10thNight
19%
619
22%
2139
8%
619
35%
619
20%
1318
March11th to 20thNight
25%
570
18%
2090
10%
570
36%
570
17%
1371
March21st to endNight
20%
600
10%
2166
5%
600
28%
600
12%
1555
April1st to 10thNight
27%
540
22%
1800
11%
540
43%
540
26%
1045
April11th to 20thNight
27%
533
22%
1775
15%
533
41%
533
24%
1092
April21st to endNight
26%
540
19%
1800
8%
540
43%
540
22%
1160
May1st to 10thNight
35%
540
17%
1693
11%
540
44%
540
25%
1088
May11th to 20thNight
39%
531
19%
1499
14%
531
46%
531
27%
992
May21st to endNight
45%
584
20%
1551
11%
582
52%
582
30%
1014
June1st to 10thNight
63%
540
19%
1440
15%
540
66%
540
40%
854
June11th to 20thNight
57%
540
26%
1440
16%
540
61%
540
40%
847
June21st to endNight
60%
540
26%
1440
16%
540
65%
540
50%
779
July1st to 10thNight
68%
525
18%
1400
15%
525
70%
525
40%
829
July11th to 20thNight
69%
522
23%
1486
20%
522
73%
522
46%
805
July21st to endNight
66%
591
24%
1673
22%
558
71%
558
38%
951
August1st to 10thNight
68%
537
23%
1601
25%
534
72%
534
40%
889
August11th to 20thNight
69%
534
27%
1686
30%
534
73%
534
38%
916
August21st to endNight
70%
594
25%
1980
29%
594
73%
594
40%
1028
September1st to 10thNight
63%
540
25%
1800
26%
540
67%
540
36%
982
September11th to 20thNight
63%
540
33%
1800
30%
540
70%
540
35%
983
September21st to endNight
56%
647
30%
2045
23%
647
63%
647
37%
1107
October1st to 10thNight
50%
720
28%
2160
20%
720
56%
720
40%
1169
October11th to 20thNight
32%
720
28%
2160
15%
720
45%
720
29%
1289
October21st to endNight
28%
792
24%
2376
11%
792
40%
792
26%
1473
November1st to 10thNight
34%
740
29%
2304
15%
740
49%
740
34%
1267
November11th to 20thNight
29%
760
27%
2470
14%
760
45%
760
26%
1450
November21st to endNight
28%
949
21%
2659
9%
949
38%
949
25%
1742
December1st to 10thNight
25%
950
18%
2660
7%
950
35%
950
22%
1808
December11th to 20thNight
25%
949
19%
3154
8%
948
33%
948
18%
2093
December21st to endNight
19%
1041
11%
4862
6%
1026
30%
1026
9%
3802

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%7%35%5%3445%7%42%
78818
Night
13%8%36%5%3445%6%44%
81115
TransparencyDay
41%6%11%24%15%2
78531
Night
41%5%11%24%16%3
80922
SeeingDay
18%12%28%25%14%3
14680
Night
18%12%30%28%12%1
24720

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
13%13%48%6%3445%5%35%
2632
11th to 20thDay
13%11%47%6%45%445%36%
2850
21st to endDay
19%13%7%6%434435%32%
3135
February1st to 10thDay
16%11%5%8%6%34445%34%
1710
11th to 20thDay
15%10%5%5%42445%6%41%
1726
21st to endDay
16%9%45%5%35%445%39%
1570
March1st to 10thDay
15%8%47%5%3435%5%41%
2057
11th to 20thDay
20%8%46%6%2445%5%37%
2090
21st to endDay
22%11%48%5%35%45%6%28%
2233
April1st to 10thDay
13%6%35%5%345%46%45%
2160
11th to 20thDay
18%8%35%4345%46%41%
2134
21st to endDay
20%8%36%5%35%45%6%35%
2160
May1st to 10thDay
17%7%37%435%46%9%35%
2263
11th to 20thDay
17%6%36%5%35%5%5%7%40%
2393
21st to endDay
12%6%35%7%46%6%7%9%36%
2725
June1st to 10thDay
7%4245%35%5%7%10%45%
2520
11th to 20thDay
8%4245%35%6%6%10%47%
2520
21st to endDay
6%324435%5%7%10%51%
2520
July1st to 10thDay
10%4246%346%8%11%42%
2520
11th to 20thDay
43245%35%5%7%10%51%
2421
21st to endDay
7%5%35%5%45%6%6%10%44%
2546
August1st to 10thDay
7%425%6%35%6%8%10%44%
2328
11th to 20thDay
9%5%25%6%45%5%7%10%43%
2213
21st to endDay
8%5%25%5%3446%7%52%
2376
September1st to 10thDay
12%4244345%5%8%49%
2160
11th to 20thDay
10%5%2443345%6%53%
2160
21st to endDay
6%5%25%4245%5%7%55%
1892
October1st to 10thDay
11%5%25%42445%6%53%
1800
11th to 20thDay
16%6%25%333335%52%
1800
21st to endDay
19%7%25%422345%46%
1980
November1st to 10thDay
12%6%2332435%6%54%
1773
11th to 20thDay
15%7%34424347%47%
1710
21st to endDay
17%8%35%323446%44%
1520
December1st to 10thDay
14%10%46%5%3335%5%43%
1520
11th to 20thDay
14%9%5%6%5%33345%43%
1918
21st to endDay
20%14%49%6%345%45%25%
2783
January1st to 10thNight
12%10%7%9%6%3443436%
4318
11th to 20thNight
13%10%49%7%5%6%5%4431%
4120
21st to endNight
21%15%6%6%433345%31%
4532
February1st to 10thNight
14%11%47%5%245%5%5%36%
2470
11th to 20thNight
14%7%47%5%34446%42%
2338
21st to endNight
16%10%46%5%33345%41%
1884
March1st to 10thNight
15%10%35%323445%47%
2139
11th to 20thNight
19%6%36%5%345%46%40%
2090
21st to endNight
21%9%46%6%45%5%5%6%29%
2166
April1st to 10thNight
11%6%36%42445%7%49%
1800
11th to 20thNight
13%8%36%424437%45%
1775
21st to endNight
17%8%36%5%2435%7%41%
1800
May1st to 10thNight
14%6%345%345%6%7%43%
1693
11th to 20thNight
15%6%26%5%3345%6%44%
1498
21st to endNight
10%5%35%6%35%47%10%42%
1551
June1st to 10thNight
8%324435%5%7%9%53%
1440
11th to 20thNight
7%4245%3446%11%51%
1440
21st to endNight
422332446%11%59%
1440
July1st to 10thNight
9%4133345%7%9%52%
1440
11th to 20thNight
421443445%11%57%
1535
21st to endNight
6%425%5%4446%9%51%
1772
August1st to 10thNight
6%425%4246%5%9%54%
1611
11th to 20thNight
7%4245%2445%8%56%
1686
21st to endNight
6%41433446%8%57%
1980
September1st to 10thNight
11%414423447%56%
1800
11th to 20thNight
9%424435%47%7%53%
1800
21st to endNight
7%5%14434348%56%
2045
October1st to 10thNight
8%42442345%6%58%
2160
11th to 20thNight
14%6%24423446%51%
2160
21st to endNight
18%7%2442343450%
2376
November1st to 10thNight
11%6%24323345%58%
2304
11th to 20thNight
13%6%35%423346%50%
2470
21st to endNight
16%8%36%423345%46%
2659
December1st to 10thNight
14%10%35%5%35%45%6%39%
2660
11th to 20thNight
16%10%5%5%5%24445%41%
3279
21st to endNight
19%19%6%8%5%33335%25%
4884

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
50%5%10%23%11%1
2633
11th to 20thDay
50%412%22%12%
2850
21st to endDay
56%410%16%13%2
3135
February1st to 10thDay
54%49%20%12%1
1710
11th to 20thDay
45%5%11%20%15%3
1735
21st to endDay
46%5%8%22%14%4
1570
March1st to 10thDay
45%49%22%16%3
2057
11th to 20thDay
51%410%20%13%2
2090
21st to endDay
58%5%10%18%8%1
2233
April1st to 10thDay
38%6%12%25%17%1
2160
11th to 20thDay
44%6%10%24%14%3
2134
21st to endDay
51%411%20%13%1
2160
May1st to 10thDay
45%8%14%21%11%1
2263
11th to 20thDay
43%7%12%22%13%2
2397
21st to endDay
44%8%13%21%12%2
2725
June1st to 10thDay
31%10%15%28%16%1
2520
11th to 20thDay
31%8%14%27%17%4
2520
21st to endDay
27%8%16%28%16%4
2520
July1st to 10thDay
33%10%14%26%14%4
2451
11th to 20thDay
27%9%16%27%18%3
2347
21st to endDay
34%8%13%31%13%2
2405
August1st to 10thDay
33%10%16%26%14%1
2314
11th to 20thDay
35%7%12%30%15%1
2213
21st to endDay
30%7%12%24%21%6%
2376
September1st to 10thDay
34%6%11%26%18%5%
2160
11th to 20thDay
31%5%9%27%25%3
2160
21st to endDay
29%6%9%27%25%4
1892
October1st to 10thDay
33%6%9%24%25%4
1800
11th to 20thDay
37%37%27%21%5%
1800
21st to endDay
42%48%24%18%3
1980
November1st to 10thDay
31%413%24%22%5%
1773
11th to 20thDay
38%48%24%22%4
1710
21st to endDay
42%49%29%15%1
1520
December1st to 10thDay
43%411%29%11%1
1520
11th to 20thDay
44%411%25%14%2
1915
21st to endDay
61%5%10%14%9%1
2783
January1st to 10thNight
52%410%23%11%1
4318
11th to 20thNight
57%410%19%9%1
4120
21st to endNight
58%310%20%8%1
4532
February1st to 10thNight
50%6%10%20%13%2
2470
11th to 20thNight
44%5%11%21%16%3
2339
21st to endNight
46%410%21%16%4
1884
March1st to 10thNight
41%5%9%24%17%4
2139
11th to 20thNight
46%6%9%22%14%3
2090
21st to endNight
55%7%12%18%8%1
2166
April1st to 10thNight
35%5%12%27%18%4
1800
11th to 20thNight
39%5%10%24%16%6%
1775
21st to endNight
44%5%10%23%18%1
1800
May1st to 10thNight
39%8%14%22%16%1
1693
11th to 20thNight
40%7%13%22%16%2
1499
21st to endNight
37%7%16%22%15%2
1552
June1st to 10thNight
28%7%15%31%17%3
1440
11th to 20thNight
28%7%10%28%23%4
1440
21st to endNight
20%6%18%29%20%7%
1440
July1st to 10thNight
28%7%15%30%17%4
1400
11th to 20thNight
22%6%14%30%24%3
1486
21st to endNight
27%8%12%34%17%1
1673
August1st to 10thNight
26%7%17%31%16%2
1601
11th to 20thNight
26%7%11%33%21%2
1686
21st to endNight
24%7%14%26%22%7%
1980
September1st to 10thNight
30%5%11%25%24%6%
1800
11th to 20thNight
28%7%11%25%24%5%
1800
21st to endNight
28%5%8%27%28%4
2045
October1st to 10thNight
26%5%9%28%26%5%
2160
11th to 20thNight
36%47%27%21%6%
2160
21st to endNight
40%39%22%22%4
2376
November1st to 10thNight
30%412%28%19%6%
2304
11th to 20thNight
37%37%26%22%4
2470
21st to endNight
42%410%25%17%2
2659
December1st to 10thNight
45%5%12%24%13%1
2660
11th to 20thNight
46%49%26%13%1
3281
21st to endNight
64%49%14%8%1
4884

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
27%22%34%14%3
270
11th to 20thDay
36%18%36%9%1
270
21st to endDay
23%26%37%12%3
297
February1st to 10thDay
30%23%32%13%2
270
11th to 20thDay
32%21%31%13%3
270
21st to endDay
33%23%34%8%2
225
March1st to 10thDay
20%31%38%10%1
270
11th to 20thDay
32%19%34%13%2
270
21st to endDay
38%22%27%13%1
303
April1st to 10thDay
21%16%38%19%5%1
420
11th to 20thDay
30%14%32%18%5%
412
21st to endDay
28%15%33%20%4
420
May1st to 10thDay
21%15%37%20%6%1
526
11th to 20thDay
20%15%29%22%12%2
625
21st to endDay
15%10%34%22%15%4
679
June1st to 10thDay
9%427%36%19%6%
630
11th to 20thDay
7%5%28%40%18%3
630
21st to endDay
6%10%34%34%12%4
630
July1st to 10thDay
12%117%31%29%10%
621
11th to 20thDay
6%424%36%27%4
618
21st to endDay
9%418%37%27%5%
684
August1st to 10thDay
9%218%42%22%5%
626
11th to 20thDay
9%421%35%26%6%
527
21st to endDay
10%317%31%30%9%
495
September1st to 10thDay
14%5%16%32%27%6%
450
11th to 20thDay
8%420%33%26%9%
450
21st to endDay
9%11%25%36%17%2
308
October1st to 10thDay
15%8%36%27%11%3
270
11th to 20thDay
23%21%34%16%5%
270
21st to endDay
36%18%30%15%1
297
November1st to 10thDay
17%15%37%20%8%3
270
11th to 20thDay
26%18%29%20%6%2
270
21st to endDay
30%14%29%22%41
270
December1st to 10thDay
21%23%34%14%6%2
270
11th to 20thDay
24%21%35%16%31
270
21st to endDay
29%25%34%11%1
297
January1st to 10thNight
20%18%36%21%41
950
11th to 20thNight
25%20%34%18%4
950
21st to endNight
21%18%36%23%2
1045
February1st to 10thNight
23%18%37%19%2
950
11th to 20thNight
22%19%35%22%2
864
21st to endNight
27%19%35%16%3
628
March1st to 10thNight
24%16%38%19%3
619
11th to 20thNight
23%14%34%26%3
570
21st to endNight
28%16%33%20%4
600
April1st to 10thNight
18%16%36%25%4
540
11th to 20thNight
20%14%35%25%5%
533
21st to endNight
21%12%38%23%6%
540
May1st to 10thNight
17%8%33%33%8%
540
11th to 20thNight
17%7%30%31%14%1
531
21st to endNight
13%7%27%32%20%1
584
June1st to 10thNight
10%319%41%26%2
540
11th to 20thNight
8%326%41%20%1
540
21st to endNight
4329%45%17%2
540
July1st to 10thNight
11%213%36%33%6%
525
11th to 20thNight
4218%43%31%2
522
21st to endNight
6%219%39%32%2
591
August1st to 10thNight
8%214%43%32%1
537
11th to 20thNight
9%313%42%31%3
534
21st to endNight
7%316%37%34%3
594
September1st to 10thNight
13%217%39%25%4
540
11th to 20thNight
10%317%36%29%5%
540
21st to endNight
10%6%23%36%22%4
647
October1st to 10thNight
11%7%28%30%22%3
720
11th to 20thNight
17%14%34%27%8%1
720
21st to endNight
24%13%32%23%7%
792
November1st to 10thNight
14%12%36%28%10%
740
11th to 20thNight
18%17%32%26%7%
760
21st to endNight
23%14%32%24%6%
949
December1st to 10thNight
22%15%35%23%5%1
950
11th to 20thNight
25%14%31%26%4
950
21st to endNight
27%18%33%20%2
1045
Page generated at 2024-03-19 22:31:03. Version ac07

Copyright © 2024 Attilla Danko.


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