Terre Haute
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Terre Haute clear sky chart from 2005-11-05 to 2017-09-23.

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
43%
15850
19%
46890
14%
15806
48%
15806
25%
30742

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
24%
900
16%
2506
7%
895
32%
895
19%
1822
January16th to endNight
23%
960
15%
2628
6%
960
30%
960
19%
1930
February1st to 15thNight
25%
713
12%
2121
5%
710
31%
710
17%
1542
February16th to endNight
26%
631
17%
1893
8%
631
33%
631
19%
1319
March1st to 15thNight
26%
720
15%
2160
9%
720
32%
720
19%
1510
March16th to endNight
32%
657
16%
2025
9%
657
40%
657
20%
1406
April1st to 15thNight
36%
539
20%
1797
13%
539
47%
539
24%
1132
April16th to endNight
41%
540
20%
1746
14%
540
49%
540
24%
1137
May1st to 15thNight
42%
540
15%
1620
10%
540
46%
540
22%
1115
May16th to endNight
55%
561
18%
1584
13%
561
58%
561
28%
1047
June1st to 15thNight
62%
540
20%
1440
16%
540
64%
540
38%
877
June16th to endNight
63%
540
20%
1440
15%
540
66%
540
38%
882
July1st to 15thNight
68%
510
18%
1360
16%
510
69%
510
39%
821
July16th to endNight
77%
564
27%
1417
22%
531
80%
531
47%
781
August1st to 15thNight
75%
539
22%
1682
22%
536
76%
536
38%
933
August16th to endNight
73%
573
24%
1910
26%
573
76%
573
37%
1028
September1st to 15thNight
63%
571
27%
1831
26%
571
67%
571
34%
1047
September16th to endNight
62%
689
28%
1903
22%
689
65%
689
35%
1149
October1st to 15thNight
57%
660
31%
1848
25%
660
61%
660
37%
1083
October16th to endNight
37%
704
21%
2236
15%
704
46%
704
25%
1390
November1st to 15thNight
43%
700
27%
2276
21%
700
54%
700
30%
1334
November16th to endNight
33%
720
20%
2340
15%
720
41%
720
21%
1544
December1st to 15thNight
25%
819
11%
2439
6%
819
30%
819
17%
1824
December16th to endNight
20%
960
13%
2688
4%
960
28%
960
14%
2089

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%6%35%5%3445%7%39%
48013
Night
14%7%35%424446%41%
47060
Cloud CoverDay
14%6%35%5%3445%7%39%
48022
Night
15%7%35%424446%41%
47065
TransparencyDay
43%6%11%22%13%2
47701
Night
42%5%11%22%15%2
46891
SeeingDay
15%5%22%25%21%9%
5870
Night
17%6%26%31%15%1
15852

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
19%10%49%6%33445%28%
1432
16th to endDay
14%12%6%7%5%34335%32%
1593
February1st to 15thDay
14%10%6%10%5%34346%31%
1739
16th to endDay
14%10%5%7%6%35%446%30%
1580
March1st to 15thDay
19%10%36%5%24445%34%
1790
16th to endDay
17%10%36%5%24447%31%
2209
April1st to 15thDay
18%8%2442445%6%39%
2151
16th to endDay
18%7%25%434446%37%
2214
May1st to 15thDay
20%7%25%5%35%5%5%5%32%
2331
16th to endDay
12%5%35%5%35%5%6%7%37%
2527
June1st to 15thDay
9%4245%345%6%9%44%
2520
16th to endDay
9%425%5%35%5%6%10%42%
2520
July1st to 15thDay
10%425%5%35%5%7%9%41%
2520
16th to endDay
6%3245%36%6%8%9%42%
2655
August1st to 15thDay
7%325%5%345%7%10%43%
2262
16th to endDay
7%5%245%45%5%6%8%45%
2292
September1st to 15thDay
12%4246%26%5%5%6%44%
2115
16th to endDay
11%415%5%33447%49%
1894
October1st to 15thDay
14%5%2442345%6%47%
1779
16th to endDay
17%5%245%23445%44%
1634
November1st to 15thDay
14%423423347%48%
1582
16th to endDay
20%7%45%413335%39%
1620
December1st to 15thDay
23%10%46%5%23445%28%
1518
16th to endDay
22%13%5%6%324345%28%
1536
January1st to 15thNight
18%9%47%5%23335%33%
2506
16th to endNight
16%12%47%5%23446%32%
2628
February1st to 15thNight
16%10%48%5%33445%32%
2119
16th to endNight
16%9%47%425%346%35%
1893
March1st to 15thNight
17%10%35%434345%36%
2147
16th to endNight
16%8%46%5%25%346%35%
2025
April1st to 15thNight
16%6%25%423445%44%
1797
16th to endNight
15%7%3443445%5%41%
1746
May1st to 15thNight
17%6%35%42445%8%36%
1620
16th to endNight
9%416%5%35%5%5%8%42%
1583
June1st to 15thNight
9%41442435%9%50%
1440
16th to endNight
7%323325%47%10%47%
1440
July1st to 15thNight
8%3234245%6%10%48%
1440
16th to endNight
43133343410%56%
1513
August1st to 15thNight
5%3234246%5%10%51%
1692
16th to endNight
5%42342445%8%53%
1910
September1st to 15thNight
10%4245%23347%51%
1831
16th to endNight
10%424423447%49%
1903
October1st to 15thNight
10%414323447%53%
1848
16th to endNight
17%6%1442335%5%44%
2236
November1st to 15thNight
11%5%24424345%50%
2276
16th to endNight
18%8%35%5%32335%39%
2340
December1st to 15thNight
21%11%5%6%5%33345%29%
2439
16th to endNight
24%11%46%424335%27%
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
19%10%410%5%3334429%
1432
16th to endDay
14%12%6%6%6%33345%32%
1593
February1st to 15thDay
14%10%6%9%6%33345%31%
1739
16th to endDay
15%11%47%6%34446%31%
1580
March1st to 15thDay
20%10%35%425%34434%
1800
16th to endDay
17%9%37%434447%32%
2208
April1st to 15thDay
19%7%34423446%39%
2151
16th to endDay
19%6%25%5%34446%37%
2214
May1st to 15thDay
22%6%35%435%45%5%33%
2331
16th to endDay
13%5%35%5%45%5%6%7%38%
2527
June1st to 15thDay
10%4245%245%6%9%45%
2520
16th to endDay
10%324425%5%6%10%43%
2520
July1st to 15thDay
10%425%5%25%5%6%9%42%
2520
16th to endDay
6%3245%36%5%8%9%42%
2655
August1st to 15thDay
8%225%4346%6%10%44%
2262
16th to endDay
8%415%445%46%7%46%
2292
September1st to 15thDay
12%4245%25%5%5%6%44%
2115
16th to endDay
11%415%424447%49%
1894
October1st to 15thDay
15%32442335%6%47%
1779
16th to endDay
18%5%25%5%23345%44%
1634
November1st to 15thDay
14%423424347%48%
1582
16th to endDay
21%7%45%413335%39%
1620
December1st to 15thDay
23%10%47%5%23445%28%
1518
16th to endDay
22%13%45%424345%28%
1536
January1st to 15thNight
19%9%47%5%23345%33%
2506
16th to endNight
16%11%47%5%24436%32%
2628
February1st to 15thNight
17%10%5%7%5%23445%32%
2112
16th to endNight
17%9%46%5%24345%36%
1893
March1st to 15thNight
18%9%34434346%36%
2160
16th to endNight
17%8%36%5%24446%35%
2025
April1st to 15thNight
17%5%34424445%43%
1797
16th to endNight
15%6%344345%5%5%41%
1746
May1st to 15thNight
18%6%35%42435%8%36%
1619
16th to endNight
10%416%5%35%5%6%8%42%
1583
June1st to 15thNight
9%41442335%8%51%
1440
16th to endNight
8%3234245%7%9%47%
1440
July1st to 15thNight
8%32442445%10%49%
1440
16th to endNight
5%2233243410%56%
1513
August1st to 15thNight
6%2244246%5%10%52%
1692
16th to endNight
6%32333445%8%54%
1910
September1st to 15thNight
11%424424346%51%
1831
16th to endNight
11%42442345%7%49%
1903
October1st to 15thNight
11%414323446%54%
1848
16th to endNight
18%5%23423446%44%
2236
November1st to 15thNight
12%5%23424345%50%
2276
16th to endNight
19%8%35%433236%39%
2340
December1st to 15thNight
22%11%47%5%2334429%
2439
16th to endNight
25%11%45%42443427%
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
58%49%17%9%
1433
16th to endDay
54%313%21%6%
1593
February1st to 15thDay
53%412%19%7%1
1741
16th to endDay
54%5%11%22%6%
1580
March1st to 15thDay
52%5%12%20%8%
1800
16th to endDay
50%5%13%22%6%
2209
April1st to 15thDay
45%410%24%13%1
2151
16th to endDay
46%5%11%21%10%4
2214
May1st to 15thDay
51%7%11%19%10%
2331
16th to endDay
43%8%11%18%15%2
2531
June1st to 15thDay
32%7%13%25%17%3
2520
16th to endDay
34%8%14%21%17%3
2520
July1st to 15thDay
38%8%11%22%17%2
2371
16th to endDay
32%9%16%26%13%1
2488
August1st to 15thDay
32%8%14%25%16%2
2249
16th to endDay
34%7%11%24%15%6%
2292
September1st to 15thDay
37%7%8%21%19%5%
2115
16th to endDay
34%6%8%25%22%3
1894
October1st to 15thDay
37%410%26%19%2
1779
16th to endDay
41%411%24%16%
1634
November1st to 15thDay
36%412%22%18%6%
1582
16th to endDay
48%39%22%14%1
1620
December1st to 15thDay
57%5%11%16%8%
1518
16th to endDay
58%5%11%18%5%
1536
January1st to 15thNight
53%310%21%11%
2506
16th to endNight
53%412%21%7%
2628
February1st to 15thNight
53%5%13%17%8%
2121
16th to endNight
49%412%22%9%
1893
March1st to 15thNight
50%410%22%10%2
2160
16th to endNight
48%5%13%22%8%1
2025
April1st to 15thNight
41%5%9%24%16%2
1797
16th to endNight
43%5%9%22%13%5%
1746
May1st to 15thNight
45%7%12%21%12%
1620
16th to endNight
38%8%13%17%17%4
1585
June1st to 15thNight
31%5%11%26%21%2
1440
16th to endNight
29%7%13%20%21%6%
1440
July1st to 15thNight
29%6%15%22%19%5%
1360
16th to endNight
23%414%33%20%2
1417
August1st to 15thNight
26%7%15%25%20%4
1682
16th to endNight
27%6%12%24%21%7%
1910
September1st to 15thNight
32%5%8%26%21%7%
1831
16th to endNight
32%5%9%21%25%5%
1903
October1st to 15thNight
30%49%26%23%4
1848
16th to endNight
41%39%25%16%2
2236
November1st to 15thNight
35%48%23%21%6%
2276
16th to endNight
48%29%22%15%
2340
December1st to 15thNight
57%410%17%9%
2439
16th to endNight
60%49%16%7%
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
31%11%34%15%6%1
90
16th to endDay
11%20%44%19%3
96
February1st to 15thDay
20%16%42%15%5%
90
16th to endDay
16%12%39%24%7%
81
March1st to 15thDay
26%15%35%17%4
90
16th to endDay
20%12%32%23%9%
264
April1st to 15thDay
19%13%26%26%12%1
270
16th to endDay
21%6%29%23%14%5%
270
May1st to 15thDay
23%7%27%24%12%4
288
16th to endDay
15%428%24%18%9%
427
June1st to 15thDay
13%218%32%26%6%
495
16th to endDay
12%427%27%20%7%
495
July1st to 15thDay
14%216%30%22%12%
475
16th to endDay
5%11%28%35%18%
515
August1st to 15thDay
13%7%20%34%24%
313
16th to endDay
7%19%27%37%15%
332
September1st to 15thDay
13%211%21%33%17%
315
16th to endDay
13%312%24%27%18%
283
October1st to 15thDay
10%224%25%25%11%
219
16th to endDay
14%5%38%30%11%
96
November1st to 15thDay
11%10%16%25%28%7%
90
16th to endDay
31%12%27%16%11%1
90
December1st to 15thDay
16%12%34%25%8%2
90
16th to endDay
32%8%44%12%2
96
January1st to 15thNight
23%12%33%25%4
900
16th to endNight
22%11%36%26%3
960
February1st to 15thNight
21%11%34%28%2
713
16th to endNight
22%9%37%27%2
631
March1st to 15thNight
21%11%35%26%4
720
16th to endNight
21%8%32%29%8%
657
April1st to 15thNight
18%10%30%30%9%
539
16th to endNight
18%430%35%10%
540
May1st to 15thNight
19%5%27%35%12%
540
16th to endNight
11%224%36%23%2
563
June1st to 15thNight
11%117%46%22%
540
16th to endNight
8%119%42%26%
540
July1st to 15thNight
9%114%37%35%2
510
16th to endNight
5%9%37%40%6%
564
August1st to 15thNight
7%9%36%40%4
539
16th to endNight
7%10%34%41%6%
573
September1st to 15thNight
11%116%33%31%5%
571
16th to endNight
12%314%30%33%5%
689
October1st to 15thNight
13%5%20%34%21%5%
660
16th to endNight
21%7%30%28%10%
704
November1st to 15thNight
14%7%29%32%15%
700
16th to endNight
23%9%31%26%9%
720
December1st to 15thNight
27%8%31%24%7%1
819
16th to endNight
30%9%31%23%4
960
Page generated at 2017-09-24 09:15:44. Version ac04

Copyright 2017 A. Danko


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