IU Kokomo Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the IU Kokomo Observatory clear sky chart from 2005-11-06 to 2024-11-10.

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%
25332
16%
96667
11%
25054
43%
25054
18%
63932

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
16%
944
10%
4408
5%
926
25%
926
8%
3384
January11th to 20thNight
14%
949
10%
4399
4%
930
21%
930
7%
3641
January21st to endNight
17%
997
7%
4774
3%
978
25%
978
7%
3809
February1st to 10thNight
19%
760
12%
2300
5%
760
25%
760
14%
1725
February11th to 20thNight
22%
739
15%
2219
7%
739
30%
739
17%
1584
February21st to endNight
17%
628
14%
1884
4%
628
26%
628
15%
1377
March1st to 10thNight
24%
759
18%
3695
8%
745
30%
745
11%
2417
March11th to 20thNight
26%
756
22%
3539
9%
740
35%
740
17%
1887
March21st to endNight
25%
743
9%
3583
6%
729
35%
729
12%
2333
April1st to 10thNight
27%
570
18%
1900
9%
570
39%
570
22%
1233
April11th to 20thNight
30%
563
20%
1875
12%
563
40%
563
22%
1212
April21st to endNight
27%
570
17%
1722
6%
570
37%
570
21%
1172
May1st to 10thNight
30%
566
15%
2771
8%
559
36%
559
13%
1855
May11th to 20thNight
43%
551
13%
2761
11%
541
48%
541
15%
1642
May21st to endNight
52%
606
14%
2866
11%
593
58%
593
20%
1566
June1st to 10thNight
55%
570
19%
1520
12%
570
60%
570
36%
938
June11th to 20thNight
56%
570
21%
1520
15%
570
61%
570
37%
926
June21st to endNight
54%
570
19%
1520
12%
570
59%
570
35%
965
July1st to 10thNight
62%
543
19%
2327
15%
535
65%
535
23%
1343
July11th to 20thNight
64%
540
20%
2207
17%
533
68%
533
33%
1085
July21st to endNight
65%
606
16%
2591
17%
569
69%
569
23%
1604
August1st to 10thNight
67%
553
21%
2608
20%
544
71%
544
24%
1443
August11th to 20thNight
64%
549
18%
2642
20%
543
68%
543
22%
1464
August21st to endNight
63%
609
18%
3063
22%
605
67%
605
24%
1602
September1st to 10thNight
60%
578
25%
1908
23%
578
65%
578
32%
1106
September11th to 20thNight
65%
760
32%
2090
25%
760
69%
760
43%
1166
September21st to endNight
54%
760
26%
2090
18%
760
59%
760
33%
1293
October1st to 10thNight
52%
760
25%
2134
20%
740
57%
740
34%
1301
October11th to 20thNight
36%
760
18%
2636
13%
740
45%
740
21%
1670
October21st to endNight
29%
836
16%
3093
13%
814
38%
814
17%
2104
November1st to 10thNight
34%
779
25%
2530
17%
779
47%
779
27%
1511
November11th to 20thNight
27%
760
22%
2470
12%
760
41%
760
20%
1594
November21st to endNight
25%
760
18%
2470
11%
760
34%
760
16%
1760
December1st to 10thNight
19%
779
13%
2489
5%
779
28%
779
15%
1827
December11th to 20thNight
21%
950
13%
3205
5%
948
29%
948
13%
2372
December21st to endNight
14%
1039
6%
4858
4%
1026
20%
1026
6%
4021

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%9%47%5%4445%7%36%
101141
Night
15%10%48%44435%6%37%
98041
TransparencyDay
46%412%23%13%2
104767
Night
46%411%23%15%2
102555
SeeingDay
17%10%27%24%15%6%
15660
Night
18%10%29%29%13%1
25479

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%14%10%13%5%45%35%5%21%
2527
11th to 20thDay
16%13%8%13%7%6%7%7%6%413%
2530
21st to endDay
29%21%7%10%43323415%
2849
February1st to 10thDay
17%14%6%10%7%5%444424%
1876
11th to 20thDay
15%12%49%7%5%4346%30%
1848
21st to endDay
16%15%6%9%4345%45%29%
1570
March1st to 10thDay
20%19%5%7%5%43235%27%
3120
11th to 20thDay
13%9%46%5%3436%7%41%
3367
21st to endDay
17%12%5%9%5%5%5%35%7%28%
3991
April1st to 10thDay
16%11%38%5%45%45%6%33%
2280
11th to 20thDay
18%10%36%5%4436%6%36%
2254
21st to endDay
19%9%37%45%335%7%34%
2456
May1st to 10thDay
18%10%37%5%5%5%46%8%28%
4082
11th to 20thDay
18%7%36%445%45%8%36%
4081
21st to endDay
11%6%26%45%5%46%10%41%
4653
June1st to 10thDay
11%6%27%6%5%446%7%42%
2660
11th to 20thDay
9%5%25%45%5%37%8%46%
2660
21st to endDay
10%5%26%6%45%46%9%41%
2660
July1st to 10thDay
14%7%27%5%45%5%7%9%36%
4440
11th to 20thDay
7%425%5%45%47%10%47%
4440
21st to endDay
10%6%26%5%5%5%5%7%9%40%
4728
August1st to 10thDay
8%5%26%445%47%9%46%
4104
11th to 20thDay
10%5%25%45%45%6%10%44%
3902
21st to endDay
7%426%43445%9%51%
4180
September1st to 10thDay
10%6%26%445%36%7%47%
2252
11th to 20thDay
10%426%445%45%8%49%
2090
21st to endDay
13%6%35%44436%7%45%
2090
October1st to 10thDay
12%6%35%45%435%7%47%
2090
11th to 20thDay
15%7%36%34445%6%42%
1919
21st to endDay
18%9%38%5%4445%7%32%
1881
November1st to 10thDay
11%8%25%44435%6%49%
1753
11th to 20thDay
17%12%47%45%425%6%34%
1710
21st to endDay
19%11%38%5%45%44433%
1710
December1st to 10thDay
17%16%5%11%5%44345%26%
1687
11th to 20thDay
16%15%6%11%5%5%425%5%26%
1918
21st to endDay
25%21%8%12%5%4423413%
2783
January1st to 10thNight
17%16%10%11%5%4324423%
4428
11th to 20thNight
13%21%8%14%6%5%5%34317%
4440
21st to endNight
25%19%7%10%43333420%
4813
February1st to 10thNight
19%15%49%5%4335%428%
2300
11th to 20thNight
13%12%410%6%5%335%5%33%
2218
21st to endNight
19%13%410%433346%30%
1884
March1st to 10thNight
19%13%47%434245%34%
3733
11th to 20thNight
12%7%25%45%436%7%45%
3592
21st to endNight
20%9%38%44445%6%35%
3668
April1st to 10thNight
13%10%36%5%4445%6%39%
1900
11th to 20thNight
17%9%36%5%3435%7%38%
1875
21st to endNight
18%8%36%445%45%6%36%
1722
May1st to 10thNight
18%10%38%6%4436%8%29%
2813
11th to 20thNight
20%7%25%43446%7%38%
2812
21st to endNight
10%5%26%5%5%5%5%6%8%45%
2905
June1st to 10thNight
9%427%5%45%45%6%50%
1520
11th to 20thNight
8%5%26%45%45%6%9%48%
1520
21st to endNight
9%7%16%45%5%5%6%9%44%
1520
July1st to 10thNight
10%5%27%44446%10%45%
2530
11th to 20thNight
6%41443337%8%56%
2530
21st to endNight
10%6%37%5%4445%8%43%
2831
August1st to 10thNight
12%425%34436%8%49%
2825
11th to 20thNight
8%5%26%5%45%47%7%47%
2910
21st to endNight
8%416%43335%9%53%
3476
September1st to 10thNight
12%5%25%443347%50%
1908
11th to 20thNight
8%5%24333347%58%
2090
21st to endNight
12%7%25%34345%6%49%
2090
October1st to 10thNight
10%5%25%34336%6%53%
2090
11th to 20thNight
17%7%26%343347%44%
2259
21st to endNight
18%8%37%444347%39%
2717
November1st to 10thNight
12%8%35%43445%6%47%
2530
11th to 20thNight
15%11%37%43436%7%38%
2470
21st to endNight
19%13%48%6%44346%31%
2470
December1st to 10thNight
17%14%410%6%4425%6%29%
2489
11th to 20thNight
17%14%6%9%5%4435%5%28%
3279
21st to endNight
24%19%7%10%5%4434415%
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
67%28%18%5%
2528
11th to 20thDay
73%39%10%6%
2530
21st to endDay
76%27%11%3
2849
February1st to 10thDay
64%39%15%9%1
1876
11th to 20thDay
56%310%22%8%1
1858
21st to endDay
57%411%20%6%2
1570
March1st to 10thDay
62%27%18%9%1
3120
11th to 20thDay
43%311%31%11%1
3367
21st to endDay
56%316%21%31
3991
April1st to 10thDay
51%5%12%19%13%1
2280
11th to 20thDay
48%410%24%10%3
2254
21st to endDay
50%411%22%10%3
2456
May1st to 10thDay
53%5%12%22%7%
4120
11th to 20thDay
47%414%26%9%1
4085
21st to endDay
38%5%12%25%19%2
4666
June1st to 10thDay
40%5%11%26%16%3
2660
11th to 20thDay
35%5%11%26%20%3
2660
21st to endDay
39%6%16%19%16%3
2660
July1st to 10thDay
43%6%12%21%15%2
4371
11th to 20thDay
30%7%15%29%19%1
4365
21st to endDay
38%8%15%18%18%3
4578
August1st to 10thDay
31%8%18%27%15%1
4091
11th to 20thDay
33%7%13%31%15%1
3941
21st to endDay
29%6%14%28%19%4
4179
September1st to 10thDay
37%413%24%18%4
2252
11th to 20thDay
33%5%10%27%22%3
2090
21st to endDay
38%5%11%24%21%2
2090
October1st to 10thDay
26%310%32%27%2
3480
11th to 20thDay
34%6%10%24%26%1
3161
21st to endDay
44%49%25%17%1
3081
November1st to 10thDay
36%314%28%17%2
1753
11th to 20thDay
52%211%21%12%2
1710
21st to endDay
55%411%21%9%1
1710
December1st to 10thDay
62%310%18%7%
1687
11th to 20thDay
62%29%23%3
1915
21st to endDay
78%37%8%4
2783
January1st to 10thNight
67%29%16%6%
4428
11th to 20thNight
73%27%13%5%
4440
21st to endNight
70%28%14%6%
4813
February1st to 10thNight
60%312%15%9%1
2300
11th to 20thNight
54%310%20%12%1
2219
21st to endNight
57%310%18%9%2
1884
March1st to 10thNight
53%39%24%10%1
3733
11th to 20thNight
39%410%28%17%2
3592
21st to endNight
51%413%25%6%1
3668
April1st to 10thNight
45%412%24%14%2
1900
11th to 20thNight
46%39%22%15%4
1875
21st to endNight
47%5%9%22%13%4
1722
May1st to 10thNight
53%411%21%10%1
2840
11th to 20thNight
45%414%26%9%1
2813
21st to endNight
36%7%13%23%18%4
2913
June1st to 10thNight
34%5%10%27%20%3
1520
11th to 20thNight
32%6%12%24%22%4
1520
21st to endNight
36%5%15%24%15%4
1520
July1st to 10thNight
35%6%13%26%14%6%
2490
11th to 20thNight
24%5%15%29%25%2
2482
21st to endNight
38%7%15%19%17%4
2741
August1st to 10thNight
32%6%15%29%15%1
2814
11th to 20thNight
31%7%14%29%17%1
2937
21st to endNight
30%5%12%30%21%3
3476
September1st to 10thNight
35%5%12%24%19%6%
1908
11th to 20thNight
27%38%29%28%3
2090
21st to endNight
35%5%10%24%23%3
2090
October1st to 10thNight
21%37%33%34%2
3480
11th to 20thNight
31%310%24%31%1
3756
21st to endNight
34%48%28%23%3
4467
November1st to 10thNight
38%49%27%20%3
2530
11th to 20thNight
46%310%23%15%3
2470
21st to endNight
56%310%23%9%
2470
December1st to 10thNight
58%310%19%9%1
2489
11th to 20thNight
58%310%20%8%1
3281
21st to endNight
74%39%10%5%
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
25%18%39%14%41
270
11th to 20thDay
28%16%38%15%21
270
21st to endDay
31%17%32%15%5%
297
February1st to 10thDay
24%18%37%17%4
270
11th to 20thDay
27%19%33%17%41
270
21st to endDay
27%19%37%16%2
225
March1st to 10thDay
25%20%36%16%4
270
11th to 20thDay
28%11%36%19%5%1
386
21st to endDay
32%14%30%16%7%1
506
April1st to 10thDay
23%15%32%20%8%2
460
11th to 20thDay
22%17%29%20%9%3
452
21st to endDay
28%13%32%17%9%2
460
May1st to 10thDay
21%13%32%23%8%3
463
11th to 20thDay
23%7%29%23%13%5%
487
21st to endDay
13%7%29%25%17%9%
628
June1st to 10thDay
9%7%30%29%20%5%
680
11th to 20thDay
12%5%26%31%19%5%
680
21st to endDay
13%5%29%29%18%7%
680
July1st to 10thDay
12%419%27%24%15%
671
11th to 20thDay
7%422%31%22%13%
668
21st to endDay
9%417%31%27%12%
690
August1st to 10thDay
8%414%32%27%16%
486
11th to 20thDay
11%319%30%25%12%
479
21st to endDay
7%315%31%32%12%
539
September1st to 10thDay
12%5%16%31%28%8%
490
11th to 20thDay
10%216%26%31%15%
490
21st to endDay
16%10%22%23%22%7%
490
October1st to 10thDay
13%7%24%31%17%8%
490
11th to 20thDay
15%19%29%24%11%2
409
21st to endDay
27%13%36%20%21
330
November1st to 10thDay
12%17%34%22%11%3
297
11th to 20thDay
26%16%31%18%8%1
270
21st to endDay
29%12%36%19%4
270
December1st to 10thDay
24%18%37%14%6%1
270
11th to 20thDay
20%16%39%19%6%
270
21st to endDay
29%19%35%15%2
297
January1st to 10thNight
24%16%35%21%4
950
11th to 20thNight
24%14%37%20%4
950
21st to endNight
23%15%36%24%3
1000
February1st to 10thNight
28%12%32%25%3
760
11th to 20thNight
20%15%37%25%3
743
21st to endNight
27%14%36%20%3
628
March1st to 10thNight
20%16%33%26%5%
760
11th to 20thNight
19%11%39%24%6%1
760
21st to endNight
26%10%32%26%6%
751
April1st to 10thNight
17%12%39%25%7%1
570
11th to 20thNight
21%12%34%24%9%1
563
21st to endNight
22%9%36%23%8%1
570
May1st to 10thNight
20%9%32%31%8%
570
11th to 20thNight
21%6%24%32%16%1
561
21st to endNight
11%324%40%19%2
617
June1st to 10thNight
8%426%45%17%1
570
11th to 20thNight
10%423%42%21%1
570
21st to endNight
10%324%40%22%1
570
July1st to 10thNight
9%214%41%28%6%
555
11th to 20thNight
7%318%36%32%4
552
21st to endNight
8%214%42%32%2
624
August1st to 10thNight
8%114%42%30%5%
567
11th to 20thNight
6%215%42%29%5%
564
21st to endNight
8%215%34%36%5%
627
September1st to 10thNight
13%316%38%27%4
578
11th to 20thNight
11%315%35%33%3
760
21st to endNight
13%7%20%35%22%2
760
October1st to 10thNight
13%6%23%36%20%3
760
11th to 20thNight
19%12%28%28%12%1
760
21st to endNight
23%12%32%26%7%
836
November1st to 10thNight
19%8%35%27%10%1
779
11th to 20thNight
21%16%31%24%7%1
760
21st to endNight
25%13%31%24%7%
760
December1st to 10thNight
25%12%36%23%41
779
11th to 20thNight
24%13%33%24%6%1
950
21st to endNight
28%16%31%21%3
1045
Page generated at 2024-11-07 06:55:45. Version ac07

Copyright © 2024 Attilla Danko.


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