Fall Creek Falls State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fall Creek Falls State 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
46%
15339
21%
46889
15%
15296
52%
15296
25%
29781

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
21%
720
19%
2327
10%
716
33%
716
17%
1580
January16th to endNight
22%
768
20%
2434
9%
768
34%
768
16%
1684
February1st to 15thNight
22%
704
18%
2112
8%
701
32%
701
19%
1428
February16th to endNight
20%
631
20%
1893
10%
631
29%
631
17%
1294
March1st to 15thNight
27%
720
19%
2110
10%
720
34%
720
21%
1420
March16th to endNight
34%
768
17%
2112
11%
768
38%
768
22%
1435
April1st to 15thNight
39%
551
25%
1809
15%
551
51%
551
30%
1044
April16th to endNight
43%
540
23%
1725
16%
540
52%
540
29%
1035
May1st to 15thNight
45%
540
19%
1620
11%
540
52%
540
27%
1047
May16th to endNight
63%
561
19%
1683
14%
561
66%
561
29%
1052
June1st to 15thNight
67%
540
16%
1620
12%
540
69%
540
32%
975
June16th to endNight
78%
540
19%
1620
16%
540
79%
540
36%
942
July1st to 15thNight
70%
510
13%
1530
11%
510
71%
510
28%
973
July16th to endNight
77%
564
17%
1595
16%
531
80%
531
34%
949
August1st to 15thNight
74%
539
19%
1667
19%
536
75%
536
30%
1028
August16th to endNight
72%
573
20%
1910
23%
573
72%
573
28%
1168
September1st to 15thNight
64%
641
19%
1878
18%
641
65%
641
29%
1209
September16th to endNight
60%
657
27%
1815
21%
657
63%
657
32%
1135
October1st to 15thNight
58%
660
35%
1815
29%
660
63%
660
38%
1057
October16th to endNight
46%
704
31%
2162
23%
704
57%
704
33%
1245
November1st to 15thNight
45%
700
28%
2276
24%
700
54%
700
30%
1298
November16th to endNight
34%
720
25%
2340
16%
720
46%
720
23%
1454
December1st to 15thNight
32%
720
19%
2340
14%
720
39%
720
17%
1602
December16th to endNight
27%
768
19%
2496
13%
768
36%
768
16%
1727

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
12%7%36%6%35%5%5%7%36%
47767
Night
11%6%35%5%2445%7%42%
47087
TransparencyDay
45%5%10%19%15%3
47468
Night
40%5%11%21%17%3
46890
SeeingDay
16%8%20%21%19%12%
5223
Night
16%10%21%28%20%4
15341

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 15thDay
17%9%48%7%2443432%
1611
16th to endDay
17%8%36%5%23435%37%
1788
February1st to 15thDay
15%10%5%7%6%2434434%
1750
16th to endDay
16%7%38%6%35%45%6%33%
1580
March1st to 15thDay
16%9%46%5%3335%7%34%
1848
16th to endDay
14%10%46%5%26%45%7%33%
2111
April1st to 15thDay
11%8%34425%5%5%6%41%
2148
16th to endDay
12%7%36%6%2445%7%39%
2235
May1st to 15thDay
13%6%37%6%245%5%6%38%
2331
16th to endDay
10%7%36%6%45%5%6%8%35%
2431
June1st to 15thDay
7%5%36%7%46%6%6%9%36%
2340
16th to endDay
5%5%25%6%46%6%8%9%37%
2340
July1st to 15thDay
12%5%36%8%47%6%7%8%28%
2340
16th to endDay
9%5%36%8%5%9%8%7%8%26%
2465
August1st to 15thDay
6%6%26%8%47%8%8%10%29%
2279
16th to endDay
11%7%37%6%48%8%6%8%26%
2292
September1st to 15thDay
14%7%27%7%5%6%5%5%7%30%
1990
16th to endDay
12%5%27%5%25%45%6%41%
1815
October1st to 15thDay
12%5%2432234452%
1815
16th to endDay
13%6%23323435%50%
1708
November1st to 15thDay
11%5%24324345%51%
1582
16th to endDay
14%7%25%423436%44%
1620
December1st to 15thDay
14%10%48%5%2445%5%33%
1620
16th to endDay
17%12%36%5%3434433%
1728
January1st to 15thNight
15%8%38%7%2334436%
2327
16th to endNight
16%11%46%5%3444434%
2434
February1st to 15thNight
14%8%5%6%6%24445%36%
2103
16th to endNight
17%9%46%5%3445%5%34%
1893
March1st to 15thNight
14%8%45%5%25%45%6%37%
2110
16th to endNight
12%9%36%5%35%35%6%38%
2112
April1st to 15thNight
11%5%24425%35%6%48%
1809
16th to endNight
10%5%245%2445%7%46%
1725
May1st to 15thNight
12%5%25%426%45%7%41%
1619
16th to endNight
7%425%5%26%5%6%9%44%
1682
June1st to 15thNight
3425%5%45%6%7%11%43%
1620
16th to endNight
3214436%6%7%11%47%
1620
July1st to 15thNight
8%425%5%35%6%8%9%40%
1620
16th to endNight
5%224436%6%8%13%41%
1703
August1st to 15thNight
3425%436%6%7%11%43%
1678
16th to endNight
7%425%5%35%5%7%11%40%
1910
September1st to 15thNight
10%5%345%35%36%8%43%
1878
16th to endNight
8%6%27%5%23445%49%
1815
October1st to 15thNight
11%314322346%55%
1815
16th to endNight
13%6%2431233453%
2162
November1st to 15thNight
11%6%24423345%51%
2276
16th to endNight
13%8%36%41333444%
2340
December1st to 15thNight
17%7%5%6%6%34445%34%
2340
16th to endNight
19%10%46%5%25%445%32%
2496

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
53%36%16%16%2
1612
16th to endDay
47%39%22%14%2
1788
February1st to 15thDay
52%28%17%16%2
1752
16th to endDay
50%311%16%15%2
1580
March1st to 15thDay
49%48%17%14%4
1848
16th to endDay
50%411%20%11%
2112
April1st to 15thDay
41%411%20%18%3
2148
16th to endDay
43%48%23%16%2
2235
May1st to 15thDay
45%5%10%23%12%2
2331
16th to endDay
45%8%12%19%11%2
2435
June1st to 15thDay
41%7%15%22%10%1
2340
16th to endDay
38%8%15%19%15%3
2340
July1st to 15thDay
49%7%14%15%9%3
2201
16th to endDay
46%10%15%17%9%1
2310
August1st to 15thDay
43%12%15%16%10%1
2266
16th to endDay
50%8%12%15%10%1
2292
September1st to 15thDay
50%6%9%17%11%3
1990
16th to endDay
41%5%9%19%21%3
1815
October1st to 15thDay
34%46%21%25%7%
1815
16th to endDay
36%37%20%27%5%
1708
November1st to 15thDay
35%35%23%24%6%
1582
16th to endDay
41%26%23%21%4
1620
December1st to 15thDay
50%47%20%13%4
1620
16th to endDay
53%310%16%13%1
1728
January1st to 15thNight
50%28%17%16%3
2327
16th to endNight
50%37%19%14%3
2434
February1st to 15thNight
48%210%20%13%3
2112
16th to endNight
49%310%21%13%2
1893
March1st to 15thNight
45%410%18%16%4
2110
16th to endNight
45%5%11%24%12%1
2112
April1st to 15thNight
35%311%23%22%3
1809
16th to endNight
35%5%10%25%19%3
1725
May1st to 15thNight
40%5%13%23%15%1
1620
16th to endNight
34%9%17%22%12%3
1684
June1st to 15thNight
33%7%18%28%10%1
1620
16th to endNight
28%7%16%28%14%4
1620
July1st to 15thNight
36%9%18%20%12%3
1530
16th to endNight
29%9%22%23%12%3
1595
August1st to 15thNight
32%10%16%25%13%2
1667
16th to endNight
34%8%17%22%14%1
1910
September1st to 15thNight
39%6%15%20%15%3
1878
16th to endNight
36%5%7%20%26%4
1815
October1st to 15thNight
29%48%23%25%8%
1815
16th to endNight
34%2421%27%9%
2162
November1st to 15thNight
35%2420%25%10%
2276
16th to endNight
43%26%20%22%4
2340
December1st to 15thNight
51%37%17%16%4
2340
16th to endNight
52%28%17%15%2
2496

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
28%31%25%8%41
90
16th to endDay
21%30%41%42
96
February1st to 15thDay
25%36%30%6%1
90
16th to endDay
32%19%39%7%1
81
March1st to 15thDay
28%22%31%14%11
138
16th to endDay
21%14%29%21%11%1
288
April1st to 15thDay
19%16%26%21%14%1
270
16th to endDay
18%8%26%25%18%2
270
May1st to 15thDay
15%10%33%15%15%8%
288
16th to endDay
14%7%20%25%15%16%
331
June1st to 15thDay
10%411%23%29%20%
315
16th to endDay
9%217%21%25%23%
315
July1st to 15thDay
17%414%21%20%22%
305
16th to endDay
10%27%19%26%33%
326
August1st to 15thDay
12%10%29%23%23%
313
16th to endDay
15%19%23%32%17%
332
September1st to 15thDay
14%311%21%34%15%
299
16th to endDay
17%214%27%28%8%
254
October1st to 15thDay
15%324%24%21%10%
255
16th to endDay
15%10%21%24%21%4
201
November1st to 15thDay
16%13%31%31%6%1
90
16th to endDay
21%16%38%15%6%1
90
December1st to 15thDay
23%20%35%14%42
90
16th to endDay
32%21%29%14%2
96
January1st to 15thNight
24%19%29%19%6%
720
16th to endNight
22%20%29%24%2
768
February1st to 15thNight
22%18%33%23%2
704
16th to endNight
23%20%31%21%2
631
March1st to 15thNight
21%15%32%25%5%
720
16th to endNight
18%12%28%27%11%1
768
April1st to 15thNight
17%11%29%28%11%1
551
16th to endNight
13%8%29%33%13%1
540
May1st to 15thNight
14%6%26%30%18%3
540
16th to endNight
8%313%36%30%7%
563
June1st to 15thNight
5%114%32%36%9%
540
16th to endNight
47%33%42%11%
540
July1st to 15thNight
10%6%30%40%10%
510
16th to endNight
6%5%25%46%16%
564
August1st to 15thNight
6%6%30%46%9%
539
16th to endNight
8%432%43%9%
573
September1st to 15thNight
13%28%27%37%9%
641
16th to endNight
12%314%31%33%4
657
October1st to 15thNight
13%8%17%27%25%8%
660
16th to endNight
16%8%24%28%20%2
704
November1st to 15thNight
15%10%23%28%18%3
700
16th to endNight
20%17%23%26%11%
720
December1st to 15thNight
22%16%24%27%8%1
720
16th to endNight
26%15%26%26%5%
768
Page generated at 2017-09-13 06:39:11. Version ac04

Copyright 2017 A. Danko


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