Town Creek Indian Mound
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Town Creek Indian Mound clear sky chart from 2005-11-05 to 2018-02-13.

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
47%
16473
22%
48730
14%
16436
55%
16436
28%
30692

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
31%
777
21%
2522
10%
776
45%
776
23%
1538
January16th to endNight
30%
832
26%
2704
15%
832
45%
832
25%
1628
February1st to 15thNight
28%
750
20%
2443
10%
750
41%
750
25%
1470
February16th to endNight
25%
631
29%
1825
10%
631
44%
631
30%
1096
March1st to 15thNight
33%
720
25%
1980
13%
720
44%
720
31%
1225
March16th to endNight
35%
768
20%
2112
10%
768
43%
768
27%
1390
April1st to 15thNight
37%
718
23%
1882
10%
718
46%
718
33%
1179
April16th to endNight
42%
699
22%
1779
11%
699
47%
699
32%
1142
May1st to 15thNight
46%
540
18%
1620
10%
540
52%
540
27%
1033
May16th to endNight
61%
561
17%
1682
13%
561
63%
561
29%
1061
June1st to 15thNight
57%
540
14%
1620
11%
540
59%
540
24%
1106
June16th to endNight
67%
540
16%
1620
14%
540
68%
540
27%
1077
July1st to 15thNight
68%
510
11%
1530
10%
510
69%
510
24%
1043
July16th to endNight
71%
564
13%
1595
11%
531
72%
531
27%
1063
August1st to 15thNight
67%
539
16%
1609
14%
536
67%
536
25%
1098
August16th to endNight
66%
707
16%
1853
12%
707
67%
707
27%
1289
September1st to 15thNight
67%
720
22%
1893
18%
720
68%
720
33%
1229
September16th to endNight
52%
717
18%
1980
15%
717
55%
717
24%
1382
October1st to 15thNight
52%
720
26%
2148
25%
720
59%
720
31%
1305
October16th to endNight
49%
768
35%
2304
25%
768
64%
768
37%
1272
November1st to 15thNight
49%
760
28%
2281
21%
760
59%
760
35%
1312
November16th to endNight
44%
780
28%
2509
20%
780
56%
780
30%
1438
December1st to 15thNight
39%
780
23%
2535
15%
780
50%
780
23%
1590
December16th to endNight
35%
832
23%
2704
16%
832
45%
832
22%
1726

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
13%5%2443445%7%43%
49302
Night
13%42442445%7%45%
48930
TransparencyDay
38%7%11%19%18%4
49003
Night
37%6%11%19%19%6%
48733
SeeingDay
15%7%23%25%20%8%
6222
Night
15%7%24%31%19%2
16481

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%7%34324335%45%
1746
16th to endDay
14%6%24323335%50%
1872
February1st to 15thDay
17%5%13323347%45%
1683
16th to endDay
16%5%24423346%47%
1646
March1st to 15thDay
14%423323346%50%
1980
16th to endDay
16%5%2442435%6%44%
2111
April1st to 15thDay
11%31342445%8%50%
2065
16th to endDay
12%425%435%447%46%
2190
May1st to 15thDay
11%6%25%5%45%45%7%39%
2331
16th to endDay
9%426%6%45%45%7%42%
2431
June1st to 15thDay
9%425%5%46%5%7%9%39%
2340
16th to endDay
7%4245%35%6%8%10%40%
2340
July1st to 15thDay
10%426%6%46%7%7%11%31%
2340
16th to endDay
7%5%25%6%47%7%8%10%33%
2465
August1st to 15thDay
11%5%36%7%46%7%7%11%29%
2340
16th to endDay
11%5%26%6%46%7%7%10%30%
2336
September1st to 15thDay
9%415%5%45%46%8%43%
2064
16th to endDay
18%6%26%5%34346%38%
1980
October1st to 15thDay
16%423413245%51%
1810
16th to endDay
13%31422343457%
1920
November1st to 15thDay
13%413213345%55%
1907
16th to endDay
13%324423445%51%
1778
December1st to 15thDay
18%6%24312346%45%
1755
16th to endDay
18%6%23324346%42%
1872
January1st to 15thNight
15%5%24423445%47%
2522
16th to endNight
17%424334345%47%
2704
February1st to 15thNight
16%424423346%47%
2435
16th to endNight
13%5%24323447%48%
1825
March1st to 15thNight
14%314424336%50%
1980
16th to endNight
15%5%14325%46%5%44%
2112
April1st to 15thNight
12%423423446%49%
1882
16th to endNight
12%424435%347%47%
1779
May1st to 15thNight
9%426%6%25%46%7%44%
1619
16th to endNight
10%314426%46%9%44%
1682
June1st to 15thNight
10%425%8%35%6%6%8%37%
1620
16th to endNight
6%325%6%45%6%7%11%39%
1620
July1st to 15thNight
8%426%6%46%6%8%11%34%
1620
16th to endNight
5%425%6%47%6%7%11%37%
1703
August1st to 15thNight
9%5%25%6%47%5%6%10%36%
1620
16th to endNight
8%5%25%6%46%5%8%11%35%
1853
September1st to 15thNight
9%5%245%3446%7%47%
1893
16th to endNight
17%6%26%5%35%346%38%
1980
October1st to 15thNight
14%6%24323335%50%
2148
16th to endNight
10%41422234458%
2304
November1st to 15thNight
13%423313246%54%
2281
16th to endNight
13%424323346%51%
2509
December1st to 15thNight
15%6%344235%5%5%44%
2535
16th to endNight
20%5%24424346%41%
2704

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
42%47%16%22%6%
1747
16th to endDay
37%36%20%22%9%
1872
February1st to 15thDay
38%48%20%22%5%
1685
16th to endDay
38%47%24%19%5%
1646
March1st to 15thDay
35%49%22%21%6%
1980
16th to endDay
40%5%11%19%18%4
2112
April1st to 15thDay
30%412%23%22%6%
2065
16th to endDay
36%6%11%16%19%7%
2190
May1st to 15thDay
42%7%13%18%15%2
2331
16th to endDay
39%7%13%21%15%1
2435
June1st to 15thDay
38%10%17%20%13%
2340
16th to endDay
33%12%15%20%14%2
2340
July1st to 15thDay
40%12%16%18%8%2
2201
16th to endDay
40%12%18%18%8%1
2310
August1st to 15thDay
45%10%14%17%10%1
2327
16th to endDay
45%10%14%17%9%1
2336
September1st to 15thDay
37%8%14%18%17%4
2064
16th to endDay
46%6%8%17%17%4
1980
October1st to 15thDay
36%5%7%23%22%4
1810
16th to endDay
31%46%19%29%9%
1920
November1st to 15thDay
32%38%19%27%8%
1907
16th to endDay
34%48%19%24%8%
1778
December1st to 15thDay
41%310%20%19%4
1755
16th to endDay
42%410%18%18%4
1872
January1st to 15thNight
38%5%9%14%24%7%
2522
16th to endNight
39%36%20%22%8%
2704
February1st to 15thNight
38%38%19%23%6%
2444
16th to endNight
35%311%21%22%5%
1825
March1st to 15thNight
35%310%19%23%7%
1980
16th to endNight
39%6%10%19%18%5%
2112
April1st to 15thNight
35%48%22%21%7%
1882
16th to endNight
36%5%11%17%19%9%
1779
May1st to 15thNight
37%7%13%20%17%3
1620
16th to endNight
35%9%15%25%12%2
1684
June1st to 15thNight
42%9%15%20%10%1
1620
16th to endNight
35%12%14%20%12%3
1620
July1st to 15thNight
39%12%16%18%10%3
1530
16th to endNight
36%12%20%18%10%1
1595
August1st to 15thNight
40%10%17%20%9%1
1609
16th to endNight
39%10%19%21%7%
1853
September1st to 15thNight
35%7%15%20%15%5%
1893
16th to endNight
45%6%11%14%18%3
1980
October1st to 15thNight
36%410%18%24%5%
2148
16th to endNight
29%36%20%25%13%
2304
November1st to 15thNight
32%37%17%25%13%
2281
16th to endNight
33%46%18%25%11%
2509
December1st to 15thNight
40%5%8%19%19%5%
2535
16th to endNight
44%311%17%17%5%
2704

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
20%22%36%20%
135
16th to endDay
18%26%31%15%8%
144
February1st to 15thDay
26%19%44%7%1
126
16th to endDay
17%15%43%21%1
152
March1st to 15thDay
14%15%33%26%8%
270
16th to endDay
18%14%32%23%10%1
288
April1st to 15thDay
19%12%28%22%14%2
270
16th to endDay
17%228%27%18%5%
270
May1st to 15thDay
15%11%31%22%12%5%
288
16th to endDay
12%320%22%30%9%
331
June1st to 15thDay
11%316%31%28%8%
315
16th to endDay
10%218%25%31%11%
315
July1st to 15thDay
10%113%26%33%14%
305
16th to endDay
9%7%29%34%18%
326
August1st to 15thDay
19%9%27%25%16%
313
16th to endDay
13%112%28%23%21%
332
September1st to 15thDay
13%213%25%26%18%
315
16th to endDay
21%6%14%27%21%8%
314
October1st to 15thDay
20%420%26%21%6%
315
16th to endDay
13%6%24%27%19%9%
336
November1st to 15thDay
18%5%27%27%18%3
325
16th to endDay
7%13%27%29%20%1
158
December1st to 15thDay
26%11%38%18%5%
135
16th to endDay
22%18%37%15%6%
144
January1st to 15thNight
18%14%30%30%6%
780
16th to endNight
19%11%34%30%3
832
February1st to 15thNight
21%11%35%28%3
753
16th to endNight
16%14%40%24%3
631
March1st to 15thNight
17%10%35%29%7%
720
16th to endNight
18%10%32%29%8%
768
April1st to 15thNight
16%12%31%30%9%
718
16th to endNight
14%7%30%34%12%
699
May1st to 15thNight
11%7%27%36%16%
540
16th to endNight
13%117%35%30%1
563
June1st to 15thNight
11%216%37%28%3
540
16th to endNight
8%112%37%36%4
540
July1st to 15thNight
9%110%36%39%3
510
16th to endNight
6%9%32%41%8%
564
August1st to 15thNight
11%8%34%39%4
539
16th to endNight
12%10%30%39%5%
707
September1st to 15thNight
10%29%35%36%5%
720
16th to endNight
20%316%29%27%2
717
October1st to 15thNight
18%420%26%25%4
720
16th to endNight
13%8%25%27%22%2
768
November1st to 15thNight
16%5%24%33%16%2
760
16th to endNight
15%10%25%31%16%1
780
December1st to 15thNight
19%9%27%34%9%
780
16th to endNight
24%9%26%32%7%
832
Page generated at 2018-02-13 20:46:10. Version ac04

Copyright 2018 A. Danko


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