Taum Sauk Mountain State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Taum Sauk Mountain State Park clear sky chart from 2005-11-05 to 2017-12-02.

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%
16091
22%
47813
13%
16044
46%
16044
27%
29665

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%
900
22%
2440
5%
895
30%
895
21%
1608
January16th to endNight
16%
960
23%
2496
5%
960
29%
960
24%
1651
February1st to 15thNight
17%
829
18%
2237
4%
826
26%
826
21%
1523
February16th to endNight
18%
631
22%
1893
6%
631
31%
631
21%
1202
March1st to 15thNight
18%
633
18%
2073
7%
633
28%
633
19%
1381
March16th to endNight
26%
576
15%
2046
9%
576
35%
576
18%
1363
April1st to 15thNight
27%
539
22%
1797
10%
539
43%
539
25%
1049
April16th to endNight
31%
540
20%
1800
12%
540
44%
540
24%
1121
May1st to 15thNight
35%
540
17%
1718
10%
539
46%
539
25%
1084
May16th to endNight
43%
563
19%
1497
12%
561
49%
561
26%
1041
June1st to 15thNight
62%
540
21%
1440
15%
540
66%
540
41%
848
June16th to endNight
60%
540
25%
1440
16%
540
65%
540
44%
829
July1st to 15thNight
68%
510
18%
1360
16%
510
70%
510
40%
815
July16th to endNight
74%
564
22%
1547
20%
531
77%
531
39%
878
August1st to 15thNight
74%
539
22%
1684
25%
536
76%
536
39%
908
August16th to endNight
69%
573
24%
1910
28%
573
73%
573
34%
1067
September1st to 15thNight
62%
540
26%
1800
25%
540
67%
540
29%
1049
September16th to endNight
58%
653
31%
1928
23%
653
65%
653
36%
1101
October1st to 15thNight
46%
720
29%
2160
19%
720
54%
720
35%
1244
October16th to endNight
33%
768
29%
2304
16%
768
46%
768
31%
1338
November1st to 15thNight
34%
760
28%
2450
16%
760
48%
760
30%
1384
November16th to endNight
27%
803
25%
2558
15%
803
39%
803
24%
1569
December1st to 15thNight
23%
910
18%
2547
7%
910
34%
910
20%
1753
December16th to endNight
19%
960
19%
2688
5%
960
32%
960
20%
1859

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%6%25%5%3445%7%41%
48629
Night
12%6%24424446%46%
48000
TransparencyDay
40%6%12%23%15%2
48319
Night
37%5%11%24%17%3
47815
SeeingDay
15%10%26%25%17%5%
6061
Night
16%12%29%25%13%1
16091

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
15%6%25%424445%44%
1495
16th to endDay
13%7%35%423347%43%
1728
February1st to 15thDay
15%9%37%41345%5%39%
1624
16th to endDay
13%9%36%43446%6%37%
1580
March1st to 15thDay
17%8%35%423445%40%
1896
16th to endDay
17%9%36%6%34445%32%
2176
April1st to 15thDay
13%8%25%423347%44%
2151
16th to endDay
19%8%36%5%34346%35%
2160
May1st to 15thDay
16%6%345%35%35%8%36%
2226
16th to endDay
12%6%37%6%35%45%7%37%
2617
June1st to 15thDay
7%5%25%6%35%5%6%8%42%
2520
16th to endDay
5%3245%36%5%7%10%45%
2520
July1st to 15thDay
10%325%6%35%5%6%10%39%
2520
16th to endDay
4325%5%47%7%8%10%39%
2511
August1st to 15thDay
8%425%6%46%6%7%9%38%
2265
16th to endDay
8%6%345%35%6%6%9%39%
2292
September1st to 15thDay
12%5%144335%5%8%45%
2160
16th to endDay
11%5%1442445%7%47%
2016
October1st to 15thDay
11%7%25%423346%47%
1800
16th to endDay
12%5%13323345%52%
1920
November1st to 15thDay
12%5%24323445%49%
1737
16th to endDay
17%8%24323335%44%
1729
December1st to 15thDay
18%7%36%434446%36%
1450
16th to endDay
17%11%45%424345%36%
1536
January1st to 15thNight
15%7%35%424345%44%
2440
16th to endNight
12%7%45%5%24446%43%
2496
February1st to 15thNight
15%8%36%42345%6%40%
2228
16th to endNight
12%7%36%434345%44%
1893
March1st to 15thNight
17%9%26%42334440%
2073
16th to endNight
18%8%35%5%24346%37%
2046
April1st to 15thNight
11%424424348%48%
1797
16th to endNight
16%6%24423335%45%
1800
May1st to 15thNight
15%7%243235%5%7%44%
1718
16th to endNight
10%6%35%6%45%447%41%
1496
June1st to 15thNight
7%313325%5%5%11%50%
1440
16th to endNight
5%2133245%6%10%53%
1440
July1st to 15thNight
8%31332445%8%54%
1440
16th to endNight
5%314335%5%6%9%51%
1654
August1st to 15thNight
5%2133246%6%10%53%
1694
16th to endNight
6%4244245%5%8%51%
1910
September1st to 15thNight
8%5%245%34447%49%
1800
16th to endNight
9%5%13324346%53%
1928
October1st to 15thNight
9%5%24423345%54%
2160
16th to endNight
15%5%1332233454%
2304
November1st to 15thNight
10%6%24313346%52%
2450
16th to endNight
17%8%23313335%47%
2558
December1st to 15thNight
19%8%25%423447%37%
2547
16th to endNight
19%10%34323346%37%
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
41%410%24%15%2
1496
16th to endDay
40%413%26%12%1
1728
February1st to 15thDay
46%412%23%11%1
1626
16th to endDay
44%6%12%22%11%2
1580
March1st to 15thDay
46%49%20%14%3
1896
16th to endDay
52%5%13%18%8%
2178
April1st to 15thDay
40%410%22%19%2
2151
16th to endDay
49%410%20%12%1
2160
May1st to 15thDay
45%7%11%21%13%
2226
16th to endDay
45%8%12%18%13%2
2621
June1st to 15thDay
36%7%14%23%16%1
2520
16th to endDay
30%8%17%23%17%3
2520
July1st to 15thDay
38%7%13%24%12%4
2371
16th to endDay
33%10%17%24%12%1
2355
August1st to 15thDay
37%9%13%23%14%1
2251
16th to endDay
36%7%15%20%14%4
2292
September1st to 15thDay
35%6%11%24%18%3
2160
16th to endDay
34%6%8%27%20%2
2016
October1st to 15thDay
36%6%8%24%19%4
1800
16th to endDay
33%47%29%21%4
1920
November1st to 15thDay
36%49%23%18%8%
1737
16th to endDay
42%38%25%18%1
1729
December1st to 15thDay
48%5%10%21%13%1
1450
16th to endDay
48%5%11%20%12%2
1536
January1st to 15thNight
41%5%9%24%16%2
2440
16th to endNight
41%412%25%15%1
2496
February1st to 15thNight
43%6%10%23%14%2
2237
16th to endNight
41%413%24%15%1
1893
March1st to 15thNight
46%410%18%16%3
2073
16th to endNight
47%5%13%22%10%
2046
April1st to 15thNight
34%6%13%25%18%2
1797
16th to endNight
41%49%26%15%2
1800
May1st to 15thNight
38%6%15%20%16%1
1719
16th to endNight
40%9%11%20%14%3
1498
June1st to 15thNight
27%6%14%30%18%1
1440
16th to endNight
23%7%13%29%19%4
1440
July1st to 15thNight
28%7%15%28%15%5%
1360
16th to endNight
25%8%17%29%17%1
1547
August1st to 15thNight
22%9%17%27%20%2
1684
16th to endNight
27%8%14%23%20%5%
1910
September1st to 15thNight
33%7%7%25%20%5%
1800
16th to endNight
30%5%10%25%24%4
1928
October1st to 15thNight
31%5%9%24%23%6%
2160
16th to endNight
33%38%27%21%5%
2304
November1st to 15thNight
32%410%24%21%6%
2450
16th to endNight
40%37%25%21%1
2558
December1st to 15thNight
46%411%20%14%1
2547
16th to endNight
47%411%20%12%3
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
36%24%34%31
90
16th to endDay
19%35%38%42
96
February1st to 15thDay
18%31%38%11%
90
16th to endDay
24%27%34%9%3
81
March1st to 15thDay
32%22%36%6%2
90
16th to endDay
24%22%35%15%2
162
April1st to 15thDay
17%18%34%23%41
270
16th to endDay
24%15%30%18%8%2
270
May1st to 15thDay
17%17%32%19%10%2
312
16th to endDay
16%11%36%21%10%3
517
June1st to 15thDay
9%5%26%32%19%6%
495
16th to endDay
6%429%37%16%4
495
July1st to 15thDay
12%420%35%21%6%
475
16th to endDay
5%114%32%35%9%
515
August1st to 15thDay
14%12%29%33%9%
418
16th to endDay
13%115%31%26%11%
332
September1st to 15thDay
10%6%14%26%30%10%
315
16th to endDay
15%5%16%22%30%10%
299
October1st to 15thDay
20%9%33%31%41
135
16th to endDay
12%16%34%31%4
144
November1st to 15thDay
16%12%32%26%9%2
135
16th to endDay
29%17%31%15%5%
135
December1st to 15thDay
20%19%32%17%5%5%
94
16th to endDay
29%22%41%5%1
96
January1st to 15thNight
21%23%35%15%3
900
16th to endNight
17%21%40%17%2
960
February1st to 15thNight
21%20%37%17%2
829
16th to endNight
18%22%38%19%1
631
March1st to 15thNight
23%18%37%19%1
633
16th to endNight
21%14%34%24%5%
576
April1st to 15thNight
15%17%37%25%4
539
16th to endNight
18%11%34%25%8%
540
May1st to 15thNight
19%6%34%27%11%
540
16th to endNight
13%5%31%30%16%2
563
June1st to 15thNight
8%321%40%23%2
540
16th to endNight
7%224%39%24%1
540
July1st to 15thNight
10%12%43%27%5%
510
16th to endNight
6%110%38%36%6%
564
August1st to 15thNight
6%111%33%41%5%
539
16th to endNight
8%113%33%37%6%
573
September1st to 15thNight
9%317%31%33%5%
540
16th to endNight
12%5%18%26%31%5%
653
October1st to 15thNight
12%6%29%26%21%3
720
16th to endNight
18%13%32%24%10%
768
November1st to 15thNight
13%15%33%25%11%
760
16th to endNight
23%16%31%22%6%
803
December1st to 15thNight
24%16%32%20%4
910
16th to endNight
27%16%35%19%2
960
Page generated at 2017-12-03 10:16:35. Version ac04

Copyright 2017 A. Danko


Taum Sauk Mountain State Park Clear Sky Chart |Charts Home