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

2017-09-12
.

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
37%
15878
16%
46758
11%
15836
43%
15836
22%
32175

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
16%
900
10%
2506
4%
895
22%
895
14%
1967
January16th to endNight
19%
952
10%
2680
4%
952
24%
952
13%
2096
February1st to 15thNight
20%
701
10%
2142
3%
701
27%
701
14%
1603
February16th to endNight
22%
631
15%
1893
5%
631
32%
631
16%
1395
March1st to 15thNight
27%
720
13%
2147
9%
720
31%
720
17%
1561
March16th to endNight
29%
714
16%
2058
8%
714
37%
714
20%
1443
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%
590
27%
1827
25%
590
68%
590
36%
1041
September16th to endNight
60%
657
26%
1815
20%
657
63%
657
35%
1100
October1st to 15thNight
49%
660
28%
1818
20%
660
55%
660
34%
1109
October16th to endNight
29%
704
17%
2285
11%
704
38%
704
19%
1549
November1st to 15thNight
34%
700
23%
2276
17%
700
45%
700
24%
1429
November16th to endNight
26%
720
15%
2340
10%
720
33%
720
14%
1697
December1st to 15thNight
19%
822
8%
2442
3%
822
24%
822
12%
1925
December16th to endNight
16%
960
9%
2688
3%
960
21%
960
10%
2231

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%
47905
Night
15%8%36%5%3445%6%37%
46928
Cloud CoverDay
14%8%36%5%35%45%7%34%
47914
Night
15%8%36%5%3445%6%36%
46933
TransparencyDay
48%5%11%19%12%1
47593
Night
47%5%11%20%13%1
46758
SeeingDay
17%6%25%24%18%7%
5880
Night
19%8%27%29%13%1
15882

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%16%47%6%3436%6%19%
1432
16th to endDay
12%18%9%9%5%45%346%19%
1542
February1st to 15thDay
14%15%7%9%7%35%445%22%
1718
16th to endDay
16%11%7%9%7%34446%24%
1580
March1st to 15thDay
19%11%48%6%3435%6%25%
1802
16th to endDay
19%9%36%6%3435%6%30%
2178
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%
2041
16th to endDay
11%5%25%425%5%6%8%42%
1815
October1st to 15thDay
16%6%2442445%5%42%
1811
16th to endDay
20%7%35%6%335%5%7%31%
1584
November1st to 15thDay
14%7%26%423446%41%
1582
16th to endDay
20%12%5%6%6%24346%27%
1620
December1st to 15thDay
19%14%6%9%6%34335%22%
1515
16th to endDay
22%16%7%9%5%34335%18%
1536
January1st to 15thNight
20%13%39%6%3445%5%23%
2506
16th to endNight
14%14%7%9%6%34445%24%
2680
February1st to 15thNight
16%12%6%7%6%24446%29%
2140
16th to endNight
17%11%6%7%6%33346%29%
1893
March1st to 15thNight
17%10%46%5%34445%32%
2134
16th to endNight
16%7%35%6%345%5%6%34%
2058
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%
1827
16th to endNight
11%5%24323446%50%
1815
October1st to 15thNight
12%424423346%51%
1818
16th to endNight
20%7%35%5%23345%37%
2285
November1st to 15thNight
14%8%25%42335%7%42%
2276
16th to endNight
20%11%37%5%3445%5%28%
2340
December1st to 15thNight
20%14%7%6%7%34435%25%
2442
16th to endNight
23%14%6%9%6%35%34418%
2688

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%47%7%3435%6%19%
1432
16th to endDay
13%18%8%10%6%44446%18%
1542
February1st to 15thDay
14%15%7%10%6%35%445%22%
1718
16th to endDay
16%12%7%9%7%34445%23%
1580
March1st to 15thDay
19%12%5%8%6%34347%24%
1812
16th to endDay
20%8%46%6%34347%30%
2177
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%45%
2041
16th to endDay
11%5%245%345%6%7%43%
1815
October1st to 15thDay
15%7%2442445%6%42%
1811
16th to endDay
20%7%36%5%3345%6%31%
1584
November1st to 15thDay
14%8%35%5%23446%42%
1582
16th to endDay
19%13%48%5%2335%6%27%
1620
December1st to 15thDay
18%15%6%9%6%34336%22%
1515
16th to endDay
22%17%7%9%5%33325%17%
1536
January1st to 15thNight
20%13%48%6%24445%23%
2506
16th to endNight
15%13%7%9%7%34445%24%
2680
February1st to 15thNight
16%12%6%7%5%2445%5%29%
2133
16th to endNight
17%11%47%6%34346%29%
1893
March1st to 15thNight
17%10%46%6%2445%432%
2147
16th to endNight
16%8%35%6%3445%7%33%
2058
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%413323338%53%
1827
16th to endNight
11%5%2432345%6%50%
1815
October1st to 15thNight
12%425%423347%50%
1818
16th to endNight
19%8%35%5%23445%37%
2285
November1st to 15thNight
13%8%25%42335%7%42%
2276
16th to endNight
19%12%47%5%3445%5%28%
2340
December1st to 15thNight
19%13%7%6%6%43345%24%
2442
16th to endNight
23%14%5%9%6%44245%18%
2688

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
64%413%10%6%
1433
16th to endDay
66%5%11%11%5%
1542
February1st to 15thDay
64%5%9%13%6%
1720
16th to endDay
61%5%12%16%4
1580
March1st to 15thDay
60%5%11%14%7%
1812
16th to endDay
54%412%21%5%1
2178
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
2041
16th to endDay
38%5%9%24%19%2
1815
October1st to 15thDay
41%5%9%24%17%1
1811
16th to endDay
51%5%11%20%10%
1584
November1st to 15thDay
42%5%10%21%17%2
1582
16th to endDay
58%313%18%5%
1620
December1st to 15thDay
65%49%15%4
1515
16th to endDay
71%49%11%2
1536
January1st to 15thNight
62%311%13%8%
2506
16th to endNight
61%412%15%5%
2680
February1st to 15thNight
56%5%12%15%8%
2142
16th to endNight
56%411%18%8%
1893
March1st to 15thNight
54%412%17%9%2
2147
16th to endNight
49%5%12%21%8%1
2058
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%5%
1827
16th to endNight
33%5%8%25%23%3
1815
October1st to 15thNight
35%48%28%23%1
1818
16th to endNight
48%410%23%11%1
2285
November1st to 15thNight
41%49%23%18%3
2276
16th to endNight
56%412%19%7%
2340
December1st to 15thNight
62%5%10%14%7%
2442
16th to endNight
69%49%11%4
2688

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
22%13%38%16%8%
90
16th to endDay
26%11%39%20%11
96
February1st to 15thDay
23%18%44%12%1
90
16th to endDay
25%9%34%17%11%1
81
March1st to 15thDay
26%20%30%17%4
102
16th to endDay
28%8%30%20%9%2
288
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
15%215%26%29%12%
299
16th to endDay
12%416%24%34%7%
254
October1st to 15thDay
16%5%24%27%19%6%
255
16th to endDay
26%11%31%29%2
96
November1st to 15thDay
7%10%23%31%22%5%
90
16th to endDay
31%11%38%13%5%
90
December1st to 15thDay
21%16%42%13%6%
90
16th to endDay
27%21%41%7%2
96
January1st to 15thNight
27%13%34%18%3
900
16th to endNight
20%14%35%26%3
952
February1st to 15thNight
24%10%36%24%4
704
16th to endNight
23%11%35%24%5%
631
March1st to 15thNight
23%10%32%26%6%
720
16th to endNight
20%8%33%28%7%
714
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%4
590
16th to endNight
14%416%32%29%3
657
October1st to 15thNight
14%5%26%32%18%3
660
16th to endNight
23%11%29%25%8%
704
November1st to 15thNight
18%9%33%25%11%1
700
16th to endNight
26%12%27%23%8%
720
December1st to 15thNight
29%13%32%20%4
822
16th to endNight
31%12%32%20%3
960
Page generated at 2017-09-13 07:39:20. Version ac04

Copyright 2017 A. Danko


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