Potawatomi Wildlife Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Potawatomi Wildlife Park clear sky chart from 2005-11-05 to 2018-03-21.

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%
16694
16%
49166
11%
16652
43%
16652
22%
33805

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 15thNight
17%
975
11%
2716
4%
970
23%
970
14%
2108
January16th to endNight
19%
1031
11%
2903
4%
1031
24%
1031
14%
2255
February1st to 15thNight
20%
761
11%
2324
4%
761
26%
761
14%
1748
February16th to endNight
21%
683
14%
2049
5%
683
30%
683
15%
1520
March1st to 15thNight
27%
780
14%
2326
9%
780
32%
780
18%
1664
March16th to endNight
29%
738
17%
2124
8%
738
37%
738
20%
1486
April1st to 15thNight
30%
539
14%
1797
9%
539
38%
539
19%
1230
April16th to endNight
32%
540
21%
1677
11%
540
42%
540
24%
1096
May1st to 15thNight
34%
540
14%
1620
8%
540
41%
540
19%
1167
May16th to endNight
50%
562
16%
1591
11%
561
53%
561
28%
1036
June1st to 15thNight
53%
540
17%
1440
11%
540
58%
540
36%
903
June16th to endNight
53%
540
16%
1440
10%
540
58%
540
34%
931
July1st to 15thNight
64%
510
17%
1360
14%
510
66%
510
39%
835
July16th to endNight
72%
564
21%
1426
16%
531
74%
531
40%
838
August1st to 15thNight
74%
539
22%
1609
21%
536
76%
536
39%
915
August16th to endNight
67%
573
20%
1881
20%
573
70%
573
33%
1078
September1st to 15thNight
63%
603
27%
1863
25%
603
67%
603
35%
1068
September16th to endNight
61%
717
28%
1980
22%
717
65%
717
37%
1180
October1st to 15thNight
48%
720
26%
1983
19%
720
54%
720
32%
1239
October16th to endNight
30%
768
18%
2493
12%
768
39%
768
19%
1672
November1st to 15thNight
33%
760
22%
2471
16%
760
43%
760
23%
1573
November16th to endNight
26%
780
16%
2535
10%
780
34%
780
15%
1813
December1st to 15thNight
19%
891
9%
2646
3%
891
25%
891
13%
2048
December16th to endNight
15%
1040
9%
2912
3%
1040
21%
1040
10%
2402

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%8%36%5%35%45%7%34%
49686
Night
15%8%36%5%3445%6%37%
49336
Cloud CoverDay
14%8%36%5%35%45%7%34%
49695
Night
15%8%36%5%3445%6%36%
49341
TransparencyDay
48%5%11%19%12%1
49374
Night
47%5%11%20%13%1
49166
SeeingDay
17%6%26%23%17%7%
6493
Night
19%7%28%28%13%1
16698

By Month

Percentage Cloud Cover NE (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 15thDay
20%17%48%6%3445%6%18%
1552
16th to endDay
13%18%8%9%5%45%346%20%
1671
February1st to 15thDay
15%15%6%9%7%35%445%22%
1866
16th to endDay
18%12%7%8%6%34346%24%
1710
March1st to 15thDay
18%11%5%8%6%3435%6%25%
1953
16th to endDay
19%9%36%6%3435%6%30%
2240
April1st to 15thDay
19%10%35%5%24446%32%
2151
16th to endDay
18%8%25%5%3345%7%35%
2283
May1st to 15thDay
20%7%46%5%25%46%7%30%
2331
16th to endDay
13%5%35%6%35%447%39%
2521
June1st to 15thDay
10%425%5%35%46%7%42%
2520
16th to endDay
10%4245%36%5%6%9%39%
2520
July1st to 15thDay
7%5%245%35%5%6%8%43%
2520
16th to endDay
6%325%5%36%6%7%10%41%
2644
August1st to 15thDay
7%4145%45%6%6%8%44%
2340
16th to endDay
8%425%6%35%6%6%9%41%
2319
September1st to 15thDay
13%5%14435%45%7%44%
2085
16th to endDay
10%5%25%4245%6%8%44%
1980
October1st to 15thDay
17%6%25%42445%5%40%
1975
16th to endDay
20%7%36%6%235%5%6%32%
1728
November1st to 15thDay
15%7%26%5%23446%40%
1717
16th to endDay
19%12%46%6%23346%29%
1755
December1st to 15thDay
18%14%6%9%7%34335%23%
1641
16th to endDay
21%16%6%9%6%3433418%
1664
January1st to 15thNight
20%13%38%5%3445%5%23%
2716
16th to endNight
14%13%6%9%7%34445%25%
2903
February1st to 15thNight
18%12%6%7%5%24446%28%
2322
16th to endNight
18%11%5%7%6%33345%29%
2049
March1st to 15thNight
16%10%46%5%24445%33%
2313
16th to endNight
15%7%36%6%345%5%7%34%
2124
April1st to 15thNight
19%5%35%5%3446%6%34%
1797
16th to endNight
19%6%24324446%40%
1677
May1st to 15thNight
19%7%27%5%345%45%32%
1620
16th to endNight
12%6%244345%5%8%42%
1589
June1st to 15thNight
10%5%24433448%49%
1440
16th to endNight
9%415%4245%6%10%43%
1440
July1st to 15thNight
6%32443436%8%51%
1440
16th to endNight
5%3242245%8%9%50%
1522
August1st to 15thNight
5%3144345%5%10%50%
1620
16th to endNight
9%31342445%8%50%
1881
September1st to 15thNight
11%314323247%53%
1863
16th to endNight
10%5%24323446%52%
1980
October1st to 15thNight
14%5%24423346%49%
1983
16th to endNight
19%7%35%5%33345%37%
2493
November1st to 15thNight
14%8%25%42345%7%41%
2471
16th to endNight
19%11%37%5%2445%6%29%
2535
December1st to 15thNight
18%13%6%6%7%24435%26%
2646
16th to endNight
22%14%6%9%6%35%34419%
2912

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 15thDay
20%17%48%7%3445%5%18%
1552
16th to endDay
14%18%7%9%6%34446%19%
1671
February1st to 15thDay
15%15%7%9%6%35%445%22%
1866
16th to endDay
17%12%6%9%6%34445%23%
1710
March1st to 15thDay
18%11%5%8%6%34446%25%
1963
16th to endDay
19%8%46%6%34347%30%
2239
April1st to 15thDay
19%10%35%5%24446%31%
2151
16th to endDay
18%8%345%34447%35%
2283
May1st to 15thDay
19%8%27%5%35%45%7%29%
2331
16th to endDay
13%6%25%5%35%45%8%38%
2521
June1st to 15thDay
10%425%5%345%5%7%43%
2520
16th to endDay
9%4246%37%6%6%9%38%
2520
July1st to 15thDay
7%425%5%35%5%6%9%43%
2520
16th to endDay
6%415%5%46%6%7%10%41%
2644
August1st to 15thDay
7%425%5%46%5%6%8%44%
2340
16th to endDay
8%426%5%35%6%7%9%41%
2319
September1st to 15thDay
12%5%24435%5%46%44%
2085
16th to endDay
10%5%244345%6%7%45%
1980
October1st to 15thDay
16%7%2442445%6%40%
1975
16th to endDay
20%7%36%5%3345%6%32%
1728
November1st to 15thDay
15%8%35%5%23446%40%
1717
16th to endDay
18%12%47%5%2335%6%29%
1755
December1st to 15thDay
17%15%6%9%6%34336%23%
1641
16th to endDay
21%17%7%9%6%34425%17%
1664
January1st to 15thNight
20%13%48%6%35%445%23%
2716
16th to endNight
14%13%6%9%8%34445%25%
2903
February1st to 15thNight
18%11%6%7%6%24445%28%
2315
16th to endNight
19%11%47%6%34345%28%
2049
March1st to 15thNight
16%10%47%6%2445%5%33%
2326
16th to endNight
15%8%35%6%3445%7%33%
2124
April1st to 15thNight
18%6%35%5%25%5%6%6%34%
1797
16th to endNight
18%6%34423447%39%
1677
May1st to 15thNight
19%7%26%6%35%5%5%6%32%
1619
16th to endNight
12%6%2443446%8%41%
1589
June1st to 15thNight
9%433424448%49%
1440
16th to endNight
9%425%5%245%6%9%44%
1440
July1st to 15thNight
6%4245%2436%8%50%
1440
16th to endNight
44143245%7%10%50%
1522
August1st to 15thNight
5%3143345%7%10%50%
1620
16th to endNight
9%31443446%8%49%
1881
September1st to 15thNight
11%413323347%53%
1863
16th to endNight
10%5%2332345%6%52%
1980
October1st to 15thNight
13%5%25%423347%48%
1983
16th to endNight
18%8%35%423445%38%
2493
November1st to 15thNight
14%8%25%42335%7%41%
2471
16th to endNight
18%11%36%5%3445%6%29%
2535
December1st to 15thNight
18%13%7%6%6%43346%26%
2646
16th to endNight
23%14%5%9%6%34345%18%
2912

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 15thDay
65%412%10%6%
1553
16th to endDay
64%5%12%11%5%
1671
February1st to 15thDay
64%5%9%13%6%
1868
16th to endDay
62%5%11%16%5%
1710
March1st to 15thDay
59%5%11%15%7%
1963
16th to endDay
54%412%21%5%1
2240
April1st to 15thDay
53%5%9%19%11%
2151
16th to endDay
48%5%12%17%11%4
2283
May1st to 15thDay
53%6%10%20%8%
2331
16th to endDay
43%5%12%21%14%2
2525
June1st to 15thDay
38%5%10%25%17%1
2520
16th to endDay
41%6%13%19%17%1
2520
July1st to 15thDay
38%6%10%21%20%2
2371
16th to endDay
35%7%15%24%15%2
2477
August1st to 15thDay
35%7%13%24%15%2
2327
16th to endDay
36%7%13%21%15%4
2319
September1st to 15thDay
38%5%12%21%18%3
2085
16th to endDay
36%5%10%24%20%2
1980
October1st to 15thDay
43%5%9%23%16%1
1975
16th to endDay
50%5%11%20%10%
1728
November1st to 15thDay
44%5%10%20%15%2
1717
16th to endDay
56%313%19%6%
1755
December1st to 15thDay
64%49%16%5%
1641
16th to endDay
71%410%10%3
1664
January1st to 15thNight
61%312%13%8%
2716
16th to endNight
60%412%15%6%
2903
February1st to 15thNight
57%5%12%15%8%
2324
16th to endNight
57%310%18%8%
2049
March1st to 15thNight
52%411%19%10%1
2326
16th to endNight
49%5%12%21%9%1
2124
April1st to 15thNight
47%6%10%19%14%
1797
16th to endNight
43%410%20%15%4
1677
May1st to 15thNight
51%6%8%21%10%1
1620
16th to endNight
39%6%13%21%16%3
1591
June1st to 15thNight
33%5%11%28%19%2
1440
16th to endNight
35%6%16%22%16%2
1440
July1st to 15thNight
32%413%24%19%4
1360
16th to endNight
28%6%15%24%20%4
1426
August1st to 15thNight
27%6%13%26%23%2
1609
16th to endNight
30%7%11%22%22%5%
1881
September1st to 15thNight
31%410%27%21%4
1863
16th to endNight
31%5%9%27%24%2
1980
October1st to 15thNight
37%47%27%21%1
1983
16th to endNight
47%410%23%12%1
2493
November1st to 15thNight
42%49%22%17%2
2471
16th to endNight
54%412%20%7%
2535
December1st to 15thNight
60%5%10%14%8%
2646
16th to endNight
68%410%11%4
2912

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 15thDay
23%12%37%17%7%
135
16th to endDay
27%12%41%17%
144
February1st to 15thDay
26%17%42%13%
135
16th to endDay
33%12%31%14%7%
120
March1st to 15thDay
22%18%32%20%6%
148
16th to endDay
28%8%31%20%9%2
311
April1st to 15thDay
25%9%32%22%8%1
270
16th to endDay
23%7%28%23%11%5%
270
May1st to 15thDay
29%7%25%22%11%3
288
16th to endDay
18%328%24%17%7%
421
June1st to 15thDay
11%427%30%19%6%
495
16th to endDay
14%6%29%25%17%7%
495
July1st to 15thDay
13%123%28%21%11%
475
16th to endDay
6%219%28%27%14%
504
August1st to 15thDay
7%113%26%32%17%
313
16th to endDay
13%114%21%32%15%
332
September1st to 15thDay
16%114%26%27%13%
315
16th to endDay
10%414%24%34%10%
314
October1st to 15thDay
20%5%23%28%17%5%
315
16th to endDay
25%11%27%30%4
144
November1st to 15thDay
15%8%27%24%18%5%
135
16th to endDay
25%13%38%14%7%
135
December1st to 15thDay
18%19%40%14%7%
135
16th to endDay
24%20%45%6%2
144
January1st to 15thNight
27%13%35%19%4
975
16th to endNight
19%13%37%25%3
1031
February1st to 15thNight
25%9%36%23%4
764
16th to endNight
25%10%36%23%4
683
March1st to 15thNight
22%10%33%27%6%
780
16th to endNight
20%8%34%28%7%
738
April1st to 15thNight
20%10%33%27%6%
539
16th to endNight
22%6%33%24%11%1
540
May1st to 15thNight
23%430%30%10%1
540
16th to endNight
15%325%37%18%
563
June1st to 15thNight
12%223%45%15%
540
16th to endNight
11%124%38%22%1
540
July1st to 15thNight
10%16%46%24%2
510
16th to endNight
7%111%40%35%3
564
August1st to 15thNight
7%11%43%32%4
539
16th to endNight
9%113%34%34%5%
573
September1st to 15thNight
13%315%32%30%5%
603
16th to endNight
13%316%31%30%4
717
October1st to 15thNight
15%5%24%32%17%3
720
16th to endNight
23%11%30%25%9%
768
November1st to 15thNight
19%9%33%25%11%1
760
16th to endNight
25%12%28%23%7%
780
December1st to 15thNight
28%13%32%20%4
891
16th to endNight
30%11%33%20%3
1040
Page generated at 2018-03-22 11:34:21. Version ac04

Copyright 2018 A. Danko


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