Fort Wayne
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fort Wayne clear sky chart from 2005-11-06 to 2024-03-28.

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
37%
24714
15%
80927
11%
24606
43%
24606
19%
57189

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
17%
943
10%
4392
5%
926
24%
926
8%
3408
January11th to 20thNight
18%
948
7%
4421
4%
930
23%
930
6%
3726
January21st to endNight
18%
942
6%
4688
4%
923
24%
923
6%
3832
February1st to 10thNight
18%
760
10%
2382
4%
760
24%
760
11%
1828
February11th to 20thNight
21%
741
13%
2219
6%
740
28%
740
15%
1627
February21st to endNight
17%
628
13%
1884
4%
628
27%
628
14%
1394
March1st to 10thNight
26%
760
14%
2280
8%
760
32%
760
18%
1631
March11th to 20thNight
29%
760
20%
2119
9%
760
38%
760
23%
1423
March21st to endNight
29%
805
15%
2240
8%
805
35%
805
19%
1624
April1st to 10thNight
30%
540
16%
1800
9%
540
40%
540
21%
1195
April11th to 20thNight
33%
533
19%
1728
12%
533
42%
533
19%
1178
April21st to endNight
33%
540
17%
1620
8%
540
41%
540
22%
1118
May1st to 10thNight
32%
540
12%
1620
6%
540
37%
540
18%
1189
May11th to 20thNight
41%
531
15%
1593
10%
531
46%
531
22%
1097
May21st to endNight
53%
583
14%
1695
10%
582
56%
582
30%
1067
June1st to 10thNight
57%
540
17%
1440
12%
540
62%
540
37%
884
June11th to 20thNight
54%
540
19%
1440
13%
540
59%
540
33%
932
June21st to endNight
56%
540
18%
1440
12%
540
60%
540
31%
948
July1st to 10thNight
64%
525
17%
1400
14%
525
66%
525
35%
872
July11th to 20thNight
67%
522
21%
1392
17%
522
69%
522
40%
819
July21st to endNight
68%
591
20%
1572
15%
558
71%
558
38%
935
August1st to 10thNight
67%
537
20%
1600
17%
534
68%
534
35%
942
August11th to 20thNight
67%
534
22%
1598
18%
534
71%
534
34%
965
August21st to endNight
67%
594
21%
1956
21%
594
70%
594
33%
1120
September1st to 10thNight
61%
584
22%
1844
21%
584
64%
584
31%
1086
September11th to 20thNight
66%
720
30%
1980
25%
720
68%
720
38%
1178
September21st to endNight
52%
720
26%
1980
19%
720
58%
720
34%
1243
October1st to 10thNight
50%
720
23%
1980
18%
720
54%
720
33%
1228
October11th to 20thNight
33%
720
19%
2141
12%
720
41%
720
22%
1443
October21st to endNight
29%
792
18%
2574
12%
792
39%
792
18%
1756
November1st to 10thNight
35%
740
22%
2406
16%
740
44%
740
25%
1471
November11th to 20thNight
28%
760
19%
2470
10%
760
39%
760
18%
1684
November21st to endNight
27%
760
15%
2470
10%
760
33%
760
15%
1817
December1st to 10thNight
20%
760
9%
2470
5%
760
25%
760
12%
1897
December11th to 20thNight
21%
920
8%
3218
4%
919
26%
919
11%
2518
December21st to endNight
15%
1041
4%
4875
3%
1026
19%
1026
5%
4114

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
15%9%47%6%35%5%5%7%33%
78796
Night
16%10%47%6%3445%6%34%
81243
TransparencyDay
49%7%12%19%12%1
78504
Night
50%6%11%19%12%2
81056
SeeingDay
17%10%27%24%16%6%
14716
Night
19%9%28%29%13%1
24734

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
17%15%11%11%7%3444420%
2527
11th to 20thDay
15%17%9%12%7%45%9%5%413%
2530
21st to endDay
27%21%12%9%5%3223313%
2942
February1st to 10thDay
17%13%6%10%9%45%445%22%
1795
11th to 20thDay
16%12%411%10%5%5%436%24%
1848
21st to endDay
17%15%7%9%5%345%5%6%26%
1570
March1st to 10thDay
17%13%5%8%7%44446%28%
1900
11th to 20thDay
16%11%37%7%35%5%5%7%31%
2060
21st to endDay
22%12%5%8%6%345%46%24%
2286
April1st to 10thDay
16%11%5%7%7%45%446%31%
2160
11th to 20thDay
18%8%36%6%35%45%7%35%
2180
21st to endDay
19%8%46%5%45%5%5%7%33%
2340
May1st to 10thDay
17%8%37%6%46%5%6%7%31%
2340
11th to 20thDay
20%6%37%6%35%46%7%34%
2301
21st to endDay
10%5%26%6%46%6%7%8%39%
2577
June1st to 10thDay
11%5%36%5%46%5%7%7%42%
2520
11th to 20thDay
10%6%25%6%36%5%6%10%42%
2520
21st to endDay
11%5%25%6%45%6%8%8%39%
2520
July1st to 10thDay
8%6%25%6%36%5%7%8%44%
2520
11th to 20thDay
8%5%25%5%36%6%6%9%45%
2520
21st to endDay
6%5%35%6%45%6%7%10%43%
2651
August1st to 10thDay
7%425%6%45%6%7%9%45%
2327
11th to 20thDay
9%436%5%45%6%8%10%41%
2303
21st to endDay
9%5%25%5%35%5%5%9%47%
2396
September1st to 10thDay
12%6%35%5%35%5%6%6%44%
2097
11th to 20thDay
11%425%4346%7%9%45%
1980
21st to endDay
14%6%25%4345%5%8%44%
1980
October1st to 10thDay
14%5%27%6%35%5%6%6%42%
1980
11th to 20thDay
16%7%26%5%35%6%5%7%38%
1817
21st to endDay
20%9%48%7%4445%7%29%
1782
November1st to 10thDay
11%8%36%42446%6%46%
1672
11th to 20thDay
17%13%47%6%34346%33%
1710
21st to endDay
21%13%48%6%3445%6%27%
1710
December1st to 10thDay
15%17%7%11%7%45%436%21%
1710
11th to 20thDay
15%15%8%11%6%45%445%23%
1942
21st to endDay
23%20%10%10%7%4433312%
2783
January1st to 10thNight
18%16%7%11%7%34445%22%
4428
11th to 20thNight
14%19%7%14%9%46%6%4415%
4440
21st to endNight
27%17%8%9%5%33335%17%
4719
February1st to 10thNight
19%14%6%8%8%44445%25%
2382
11th to 20thNight
13%13%5%8%8%4445%6%29%
2218
21st to endNight
20%11%5%8%6%3445%5%29%
1884
March1st to 10thNight
17%10%48%6%45%445%35%
2280
11th to 20thNight
14%6%45%6%35%5%5%8%39%
2119
21st to endNight
20%10%5%6%6%33446%34%
2240
April1st to 10thNight
15%8%45%6%35%5%5%8%38%
1800
11th to 20thNight
18%7%46%4445%5%5%37%
1728
21st to endNight
18%8%36%5%345%5%7%37%
1620
May1st to 10thNight
19%8%37%6%35%6%5%7%31%
1620
11th to 20thNight
20%7%45%5%3345%7%37%
1592
21st to endNight
10%4345%35%6%7%9%44%
1694
June1st to 10thNight
9%5%344345%7%8%48%
1440
11th to 20thNight
9%5%345%35%5%6%8%47%
1440
21st to endNight
9%5%36%5%26%6%6%8%45%
1440
July1st to 10thNight
6%6%37%43445%9%49%
1440
11th to 20thNight
8%424435%46%9%53%
1440
21st to endNight
7%425%5%35%5%6%9%49%
1665
August1st to 10thNight
7%425%5%35%5%5%9%49%
1611
11th to 20thNight
8%435%5%3446%9%49%
1598
21st to endNight
8%425%4345%7%7%52%
1956
September1st to 10thNight
12%5%245%2445%7%51%
1844
11th to 20thNight
10%5%2443445%7%53%
1980
21st to endNight
12%6%24434446%50%
1980
October1st to 10thNight
11%5%25%43446%7%49%
1980
11th to 20thNight
18%8%46%6%34446%38%
2141
21st to endNight
21%7%36%5%3445%7%36%
2574
November1st to 10thNight
13%8%35%5%3435%6%45%
2406
11th to 20thNight
17%11%37%5%245%5%8%34%
2470
21st to endNight
19%12%5%7%6%3445%6%28%
2470
December1st to 10thNight
18%13%5%9%6%45%5%5%6%24%
2470
11th to 20thNight
17%14%8%9%7%35%445%25%
3250
21st to endNight
27%17%7%8%6%35%445%13%
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%6%9%14%4
2528
11th to 20thDay
71%6%10%8%6%
2530
21st to endDay
78%37%9%3
2942
February1st to 10thDay
64%5%9%13%7%1
1795
11th to 20thDay
62%5%9%17%6%
1858
21st to endDay
58%5%13%17%6%1
1570
March1st to 10thDay
58%5%10%20%7%
1900
11th to 20thDay
51%7%11%20%9%2
2060
21st to endDay
60%6%11%17%5%1
2286
April1st to 10thDay
53%6%10%19%11%
2160
11th to 20thDay
48%6%11%20%12%3
2180
21st to endDay
49%6%13%17%11%3
2340
May1st to 10thDay
51%8%12%19%9%1
2340
11th to 20thDay
50%8%10%18%13%2
2305
21st to endDay
40%10%13%22%13%2
2577
June1st to 10thDay
39%8%11%23%17%2
2520
11th to 20thDay
37%9%12%23%17%3
2520
21st to endDay
38%10%14%20%14%3
2520
July1st to 10thDay
37%8%12%21%17%4
2451
11th to 20thDay
34%8%14%26%16%2
2445
21st to endDay
34%9%14%23%17%2
2504
August1st to 10thDay
33%8%16%26%15%1
2314
11th to 20thDay
36%9%16%23%14%2
2303
21st to endDay
33%8%13%22%19%4
2396
September1st to 10thDay
38%8%14%20%16%4
2097
11th to 20thDay
32%8%13%27%19%1
1980
21st to endDay
38%7%12%24%19%1
1980
October1st to 10thDay
41%7%11%24%16%2
1980
11th to 20thDay
43%6%11%22%17%1
1817
21st to endDay
55%6%13%16%9%1
1782
November1st to 10thDay
37%6%12%27%17%1
1672
11th to 20thDay
54%5%11%18%11%2
1710
21st to endDay
59%6%11%17%7%1
1710
December1st to 10thDay
65%6%12%12%5%
1710
11th to 20thDay
61%7%12%17%3
1939
21st to endDay
78%5%6%6%5%
2783
January1st to 10thNight
63%7%9%13%7%
4428
11th to 20thNight
72%5%9%11%3
4440
21st to endNight
71%49%12%3
4719
February1st to 10thNight
62%5%11%13%8%1
2382
11th to 20thNight
54%6%11%19%9%1
2219
21st to endNight
56%5%11%16%9%2
1884
March1st to 10thNight
53%5%11%20%11%1
2280
11th to 20thNight
42%8%11%22%14%3
2119
21st to endNight
51%6%10%23%10%1
2240
April1st to 10thNight
45%7%12%21%15%1
1800
11th to 20thNight
46%8%9%18%17%2
1728
21st to endNight
46%7%12%19%13%3
1620
May1st to 10thNight
51%8%11%17%10%2
1620
11th to 20thNight
46%7%11%20%15%2
1593
21st to endNight
35%9%17%21%15%3
1695
June1st to 10thNight
32%6%13%27%19%3
1440
11th to 20thNight
34%9%11%23%20%3
1440
21st to endNight
36%9%15%22%15%3
1440
July1st to 10thNight
34%6%13%23%20%4
1400
11th to 20thNight
28%6%17%27%18%3
1392
21st to endNight
30%7%16%24%18%5%
1572
August1st to 10thNight
30%8%14%27%19%2
1600
11th to 20thNight
32%8%14%25%19%3
1598
21st to endNight
29%9%13%23%22%4
1956
September1st to 10thNight
33%7%14%23%19%5%
1844
11th to 20thNight
30%7%10%28%24%2
1980
21st to endNight
34%7%11%25%21%2
1980
October1st to 10thNight
34%7%11%26%21%1
1980
11th to 20thNight
47%49%22%16%1
2141
21st to endNight
48%6%10%22%13%1
2574
November1st to 10thNight
40%5%11%25%18%1
2406
11th to 20thNight
49%5%13%19%13%2
2470
21st to endNight
56%6%12%19%7%
2470
December1st to 10thNight
60%7%11%15%7%
2470
11th to 20thNight
60%8%12%13%7%1
3252
21st to endNight
73%6%10%7%3
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
22%20%33%19%5%1
270
11th to 20thDay
24%12%45%13%6%1
270
21st to endDay
29%15%31%18%7%
297
February1st to 10thDay
25%18%31%21%5%
270
11th to 20thDay
24%19%33%19%6%
270
21st to endDay
26%18%43%10%3
225
March1st to 10thDay
23%21%33%19%31
270
11th to 20thDay
23%13%34%21%7%1
430
21st to endDay
30%13%31%19%6%1
490
April1st to 10thDay
21%14%29%23%11%2
420
11th to 20thDay
20%15%32%18%12%3
412
21st to endDay
23%14%31%18%11%2
420
May1st to 10thDay
23%12%31%21%9%3
423
11th to 20thDay
22%8%26%24%15%6%
447
21st to endDay
11%5%27%29%17%11%
531
June1st to 10thDay
11%7%28%33%17%5%
630
11th to 20thDay
11%6%30%26%20%7%
630
21st to endDay
13%7%27%28%18%7%
630
July1st to 10thDay
9%418%31%23%15%
621
11th to 20thDay
7%424%30%23%12%
618
21st to endDay
8%320%29%28%12%
592
August1st to 10thDay
8%312%28%28%20%
446
11th to 20thDay
10%318%28%27%14%
439
21st to endDay
9%215%27%32%14%
495
September1st to 10thDay
14%5%15%26%27%13%
450
11th to 20thDay
11%314%23%34%16%
450
21st to endDay
16%9%20%23%23%8%
450
October1st to 10thDay
13%7%25%26%19%10%
450
11th to 20thDay
17%17%28%28%8%1
426
21st to endDay
26%16%33%21%21
297
November1st to 10thDay
10%15%36%24%12%4
270
11th to 20thDay
24%18%28%19%10%1
270
21st to endDay
28%12%39%19%3
270
December1st to 10thDay
19%23%33%17%8%
270
11th to 20thDay
21%15%40%18%5%
270
21st to endDay
29%20%32%17%3
297
January1st to 10thNight
22%15%35%22%5%
950
11th to 20thNight
25%13%35%21%5%1
950
21st to endNight
24%15%34%24%4
945
February1st to 10thNight
26%11%36%24%3
760
11th to 20thNight
20%13%39%25%3
743
21st to endNight
27%14%37%19%3
628
March1st to 10thNight
22%11%33%26%8%
760
11th to 20thNight
17%12%38%27%6%1
760
21st to endNight
25%10%31%28%7%
805
April1st to 10thNight
19%10%35%29%7%
540
11th to 20thNight
21%10%32%29%8%1
533
21st to endNight
20%10%32%28%9%1
540
May1st to 10thNight
21%6%33%32%8%1
540
11th to 20thNight
23%5%25%31%16%1
531
21st to endNight
12%325%38%21%2
584
June1st to 10thNight
9%326%46%16%
540
11th to 20thNight
11%324%42%20%
540
21st to endNight
8%422%41%23%1
540
July1st to 10thNight
8%216%42%30%3
525
11th to 20thNight
8%315%40%31%3
522
21st to endNight
7%316%41%32%1
591
August1st to 10thNight
7%213%43%29%5%
537
11th to 20thNight
9%213%41%31%4
534
21st to endNight
9%213%34%36%5%
594
September1st to 10thNight
14%314%36%30%3
584
11th to 20thNight
11%313%35%34%4
720
21st to endNight
14%5%23%33%22%3
720
October1st to 10thNight
14%426%31%22%2
720
11th to 20thNight
21%13%27%28%10%1
720
21st to endNight
25%13%30%26%6%
792
November1st to 10thNight
17%11%33%26%13%1
740
11th to 20thNight
23%13%32%25%7%1
760
21st to endNight
25%11%31%26%7%
760
December1st to 10thNight
24%14%34%22%5%
760
11th to 20thNight
25%13%35%22%5%
921
21st to endNight
31%13%33%21%3
1045
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