Emporia
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Emporia clear sky chart from 2005-11-06 to 2024-01-12.

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%
24445
24%
74402
14%
24382
51%
24382
33%
43553

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
34%
950
25%
2458
9%
946
46%
946
35%
1506
January11th to 20thNight
30%
908
25%
2360
10%
908
40%
908
32%
1507
January21st to endNight
30%
990
27%
2574
9%
990
42%
990
34%
1591
February1st to 10thNight
25%
900
18%
2340
6%
900
32%
900
27%
1567
February11th to 20thNight
27%
804
20%
2199
7%
800
36%
800
28%
1396
February21st to endNight
26%
592
28%
1776
10%
592
40%
592
28%
1081
March1st to 10thNight
27%
542
26%
1982
12%
542
44%
542
28%
1096
March11th to 20thNight
32%
540
21%
1980
14%
540
42%
540
24%
1138
March21st to endNight
21%
594
17%
2178
8%
594
35%
594
18%
1438
April1st to 10thNight
26%
540
22%
1958
11%
540
44%
540
28%
1052
April11th to 20thNight
30%
533
24%
1730
13%
533
45%
533
27%
1015
April21st to endNight
28%
540
22%
1620
11%
540
44%
540
29%
994
May1st to 10thNight
33%
540
18%
1620
13%
540
43%
540
26%
1046
May11th to 20thNight
42%
531
21%
1594
18%
531
50%
531
32%
954
May21st to endNight
46%
584
18%
1745
13%
582
54%
582
31%
1057
June1st to 10thNight
59%
540
20%
1620
14%
540
65%
540
42%
879
June11th to 20thNight
53%
540
20%
1620
13%
540
59%
540
41%
875
June21st to endNight
53%
540
23%
1620
13%
540
60%
540
44%
857
July1st to 10thNight
68%
525
17%
1575
14%
525
70%
525
39%
898
July11th to 20thNight
75%
522
24%
1566
23%
522
78%
522
51%
780
July21st to endNight
68%
591
23%
1673
24%
558
71%
558
36%
970
August1st to 10thNight
66%
537
22%
1601
22%
534
71%
534
39%
882
August11th to 20thNight
68%
534
29%
1600
30%
534
73%
534
40%
879
August21st to endNight
73%
594
30%
1859
33%
594
75%
594
45%
946
September1st to 10thNight
62%
540
27%
1910
29%
540
67%
540
38%
978
September11th to 20thNight
57%
540
28%
1980
26%
540
65%
540
33%
1039
September21st to endNight
56%
540
32%
1980
30%
540
64%
540
39%
964
October1st to 10thNight
50%
641
28%
2081
21%
641
56%
641
35%
1141
October11th to 20thNight
35%
720
31%
2160
13%
720
48%
720
39%
1184
October21st to endNight
36%
792
29%
2376
14%
792
48%
792
34%
1356
November1st to 10thNight
42%
820
32%
2300
14%
820
55%
820
44%
1244
November11th to 20thNight
35%
950
30%
2470
10%
950
48%
950
41%
1420
November21st to endNight
37%
950
28%
2470
12%
950
47%
950
38%
1471
December1st to 10thNight
34%
950
26%
2470
10%
950
46%
950
34%
1523
December11th to 20thNight
30%
949
27%
2885
9%
948
42%
948
27%
1718
December21st to endNight
28%
1042
17%
4472
11%
1026
40%
1026
17%
3111

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%6%35%5%3445%7%47%
74926
Night
10%6%35%43445%7%51%
74819
TransparencyDay
36%5%12%26%17%3
74650
Night
33%5%12%27%20%4
74615
SeeingDay
13%9%29%29%17%4
14450
Night
13%9%33%33%12%1
24449

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%7%36%5%34346%48%
1707
11th to 20thDay
12%9%45%5%23346%46%
1629
21st to endDay
8%8%48%5%35%447%43%
1782
February1st to 10thDay
12%11%46%5%34346%42%
1620
11th to 20thDay
9%7%48%6%35%45%6%43%
1664
21st to endDay
11%8%36%4345%5%7%45%
1480
March1st to 10thDay
10%8%37%5%245%5%6%46%
1977
11th to 20thDay
19%9%34423336%45%
1980
21st to endDay
19%10%36%5%34446%36%
2178
April1st to 10thDay
12%6%25%43435%7%49%
2002
11th to 20thDay
15%7%25%5%44446%43%
2176
21st to endDay
17%6%36%5%2445%7%40%
2340
May1st to 10thDay
16%9%36%5%2446%7%39%
2340
11th to 20thDay
16%7%25%43445%7%43%
2302
21st to endDay
15%7%27%5%45%5%6%8%35%
2531
June1st to 10thDay
6%314435%5%5%10%53%
2340
11th to 20thDay
8%425%5%3446%8%50%
2340
21st to endDay
5%3244345%6%9%56%
2340
July1st to 10thDay
9%4245%45%6%7%10%44%
2340
11th to 20thDay
4212435%5%7%9%56%
2340
21st to endDay
8%425%5%35%6%6%9%46%
2546
August1st to 10thDay
7%425%5%35%6%7%8%47%
2328
11th to 20thDay
7%3245%345%5%8%52%
2301
21st to endDay
6%423435%46%8%55%
2494
September1st to 10thDay
13%41432445%6%52%
2047
11th to 20thDay
10%5%245%3345%6%52%
1980
21st to endDay
8%4245%3445%6%55%
1980
October1st to 10thDay
10%425%434447%53%
1859
11th to 20thDay
12%413323346%59%
1800
21st to endDay
14%6%24323345%52%
1980
November1st to 10thDay
8%5%24423347%59%
1777
11th to 20thDay
10%6%24322247%57%
1710
21st to endDay
14%6%34323236%56%
1710
December1st to 10thDay
10%5%344245%5%8%49%
1710
11th to 20thDay
11%8%46%6%34346%45%
2161
21st to endDay
13%12%9%12%6%33446%29%
3135
January1st to 10thNight
7%7%35%4345%5%6%52%
2458
11th to 20thNight
10%7%46%434346%49%
2360
21st to endNight
8%7%35%5%33445%52%
2574
February1st to 10thNight
11%10%46%5%2345%6%45%
2340
11th to 20thNight
12%7%36%434446%47%
2198
21st to endNight
11%6%35%4345%45%50%
1776
March1st to 10thNight
12%5%245%2345%8%50%
1982
11th to 20thNight
15%6%2442445%7%48%
1980
21st to endNight
18%9%35%5%4445%6%38%
2178
April1st to 10thNight
11%5%24424447%53%
1958
11th to 20thNight
13%7%35%42335%7%48%
1730
21st to endNight
15%5%25%43445%7%47%
1620
May1st to 10thNight
17%6%35%43436%7%42%
1620
11th to 20thNight
13%5%24324347%51%
1593
21st to endNight
10%5%245%345%7%10%45%
1745
June1st to 10thNight
5%2135%345%6%11%54%
1620
11th to 20thNight
5%3145%345%6%12%52%
1620
21st to endNight
5%31343445%8%59%
1620
July1st to 10thNight
6%4245%26%5%7%9%51%
1620
11th to 20thNight
22124245%7%10%60%
1620
21st to endNight
7%325%5%345%6%10%49%
1772
August1st to 10thNight
5%3245%35%5%7%9%53%
1611
11th to 20thNight
6%3345%3446%8%55%
1600
21st to endNight
6%22332445%7%62%
1859
September1st to 10thNight
10%5%1332335%6%58%
1910
11th to 20thNight
9%42443445%6%54%
1980
21st to endNight
6%42343345%6%61%
1980
October1st to 10thNight
11%43442435%7%54%
2081
11th to 20thNight
11%5%24323235%60%
2160
21st to endNight
13%6%23323345%55%
2376
November1st to 10thNight
8%5%23322335%63%
2300
11th to 20thNight
8%5%2442345%6%57%
2470
21st to endNight
13%6%24323346%56%
2470
December1st to 10thNight
9%6%35%4345%6%7%50%
2470
11th to 20thNight
10%8%36%434446%49%
3036
21st to endNight
17%12%6%8%5%3344435%
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
38%411%25%19%2
1708
11th to 20thDay
40%412%26%17%1
1629
21st to endDay
41%315%26%13%2
1782
February1st to 10thDay
44%5%11%25%12%3
1620
11th to 20thDay
41%412%25%14%3
1673
21st to endDay
39%410%24%17%5%
1480
March1st to 10thDay
38%5%11%23%18%6%
1977
11th to 20thDay
43%49%24%17%3
1980
21st to endDay
51%5%12%22%8%3
2178
April1st to 10thDay
36%5%11%25%20%3
2002
11th to 20thDay
42%5%10%24%16%2
2176
21st to endDay
45%5%11%27%12%1
2340
May1st to 10thDay
46%6%11%20%14%1
2340
11th to 20thDay
41%5%14%26%14%
2306
21st to endDay
46%8%14%21%9%2
2531
June1st to 10thDay
26%7%16%32%16%2
2340
11th to 20thDay
32%5%13%28%19%3
2340
21st to endDay
25%6%14%31%21%4
2340
July1st to 10thDay
32%8%14%27%16%3
2276
11th to 20thDay
22%8%16%28%20%6%
2271
21st to endDay
31%8%15%28%17%1
2405
August1st to 10thDay
31%9%14%29%14%2
2314
11th to 20thDay
30%7%10%32%18%3
2301
21st to endDay
26%6%12%26%21%8%
2494
September1st to 10thDay
32%5%13%25%18%7%
2047
11th to 20thDay
32%6%10%28%22%3
1980
21st to endDay
30%6%9%24%28%4
1980
October1st to 10thDay
32%5%12%24%24%3
1859
11th to 20thDay
27%38%27%28%7%
1800
21st to endDay
35%411%23%21%7%
1980
November1st to 10thDay
27%410%30%22%7%
1777
11th to 20thDay
29%39%28%26%4
1710
21st to endDay
33%29%29%24%3
1710
December1st to 10thDay
34%5%12%33%16%1
1710
11th to 20thDay
42%210%27%16%2
2159
21st to endDay
57%39%20%9%2
3135
January1st to 10thNight
34%413%28%19%3
2458
11th to 20thNight
38%311%27%19%2
2360
21st to endNight
34%414%28%16%3
2574
February1st to 10thNight
42%5%12%24%14%4
2340
11th to 20thNight
38%5%11%26%17%3
2199
21st to endNight
36%5%8%24%19%8%
1776
March1st to 10thNight
33%410%24%22%7%
1982
11th to 20thNight
38%412%24%18%5%
1980
21st to endNight
47%5%10%22%13%2
2178
April1st to 10thNight
32%411%24%23%5%
1958
11th to 20thNight
36%5%11%26%19%3
1730
21st to endNight
37%5%13%25%17%3
1620
May1st to 10thNight
42%5%14%22%15%2
1620
11th to 20thNight
34%5%15%28%17%1
1594
21st to endNight
33%7%20%26%12%2
1746
June1st to 10thNight
23%8%20%32%14%3
1620
11th to 20thNight
25%6%16%31%19%3
1620
21st to endNight
24%5%13%32%21%5%
1620
July1st to 10thNight
28%7%17%26%18%5%
1575
11th to 20thNight
18%6%15%32%23%6%
1566
21st to endNight
29%8%13%30%19%1
1673
August1st to 10thNight
26%7%17%31%14%4
1601
11th to 20thNight
27%5%11%30%23%3
1600
21st to endNight
22%5%10%28%26%8%
1859
September1st to 10thNight
27%411%28%20%9%
1910
11th to 20thNight
30%5%10%24%26%5%
1980
21st to endNight
24%49%25%31%6%
1980
October1st to 10thNight
31%411%22%25%7%
2081
11th to 20thNight
28%36%29%25%8%
2160
21st to endNight
32%48%22%27%7%
2376
November1st to 10thNight
26%39%30%25%8%
2300
11th to 20thNight
27%39%29%27%5%
2470
21st to endNight
31%310%28%22%5%
2470
December1st to 10thNight
34%413%28%20%1
2470
11th to 20thNight
35%410%31%18%3
3037
21st to endNight
52%410%22%10%3
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
18%16%33%24%9%
270
11th to 20thDay
23%14%42%18%3
243
21st to endDay
11%14%47%25%3
264
February1st to 10thDay
19%20%41%18%21
240
11th to 20thDay
17%15%42%19%6%
240
21st to endDay
17%25%38%18%21
198
March1st to 10thDay
15%20%43%20%3
240
11th to 20thDay
28%11%36%19%5%
240
21st to endDay
27%22%35%14%2
264
April1st to 10thDay
18%19%39%18%6%
262
11th to 20thDay
19%12%41%22%41
454
21st to endDay
22%13%38%19%7%2
600
May1st to 10thDay
18%14%35%24%8%1
603
11th to 20thDay
21%10%26%28%13%2
625
21st to endDay
18%9%29%24%16%4
679
June1st to 10thDay
5%323%35%26%7%
630
11th to 20thDay
9%428%37%19%3
630
21st to endDay
6%5%32%40%16%1
630
July1st to 10thDay
12%113%34%30%10%
621
11th to 20thDay
5%215%42%29%6%
618
21st to endDay
9%213%37%32%8%
684
August1st to 10thDay
7%319%36%31%4
626
11th to 20thDay
8%115%40%30%6%
615
21st to endDay
9%213%31%37%8%
613
September1st to 10thDay
13%211%39%29%6%
337
11th to 20thDay
6%319%40%26%7%
270
21st to endDay
12%429%33%18%4
270
October1st to 10thDay
13%8%32%24%15%9%
270
11th to 20thDay
9%15%44%24%8%
270
21st to endDay
21%15%35%21%6%2
297
November1st to 10thDay
12%11%33%31%11%2
270
11th to 20thDay
16%17%35%22%8%2
270
21st to endDay
21%12%36%21%10%
270
December1st to 10thDay
10%11%42%26%7%4
270
11th to 20thDay
16%13%37%25%7%1
270
21st to endDay
19%20%41%19%1
297
January1st to 10thNight
12%11%39%31%6%
950
11th to 20thNight
14%12%37%30%6%1
908
21st to endNight
12%12%40%31%5%
990
February1st to 10thNight
16%12%44%26%3
900
11th to 20thNight
16%14%39%28%3
804
21st to endNight
14%16%40%25%4
592
March1st to 10thNight
15%11%43%26%5%
542
11th to 20thNight
17%11%36%27%7%
540
21st to endNight
22%14%39%20%4
594
April1st to 10thNight
14%12%44%23%6%
540
11th to 20thNight
17%17%33%28%5%
533
21st to endNight
17%13%39%23%7%1
540
May1st to 10thNight
18%10%34%31%7%
540
11th to 20thNight
15%7%32%33%12%
531
21st to endNight
12%6%32%32%16%2
584
June1st to 10thNight
6%326%41%24%1
540
11th to 20thNight
6%431%43%17%
540
21st to endNight
7%334%46%11%
540
July1st to 10thNight
7%216%43%30%2
525
11th to 20thNight
2117%51%26%3
522
21st to endNight
8%213%45%31%1
591
August1st to 10thNight
6%219%45%27%1
537
11th to 20thNight
6%215%49%27%1
534
21st to endNight
6%114%44%32%3
594
September1st to 10thNight
12%219%43%21%2
540
11th to 20thNight
10%224%38%22%3
540
21st to endNight
9%426%41%18%2
540
October1st to 10thNight
13%6%27%32%21%1
641
11th to 20thNight
14%9%39%29%8%
720
21st to endNight
17%9%35%29%9%1
792
November1st to 10thNight
10%10%35%32%13%1
820
11th to 20thNight
11%13%38%30%7%
950
21st to endNight
16%12%32%33%7%
950
December1st to 10thNight
14%10%37%32%6%
950
11th to 20thNight
16%11%37%31%5%
950
21st to endNight
16%14%37%29%4
1045
Page generated at 2024-01-09 06:14:45. Version ac07

Copyright 2024 Attilla Danko


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