Table Rock State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Table Rock State Park clear sky chart from 2005-11-06 to 2024-01-13.

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
46%
24037
21%
74354
14%
23980
54%
23980
26%
47231

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 10thNight
30%
760
23%
2459
11%
757
45%
757
26%
1491
January11th to 20thNight
29%
732
23%
2378
12%
732
44%
732
23%
1508
January21st to endNight
27%
792
27%
2574
13%
792
45%
792
27%
1521
February1st to 10thNight
31%
720
24%
2232
12%
720
44%
720
27%
1370
February11th to 20thNight
24%
703
23%
2098
9%
699
39%
699
24%
1363
February21st to endNight
26%
592
23%
1776
12%
592
38%
592
22%
1174
March1st to 10thNight
33%
720
25%
2029
13%
720
43%
720
29%
1282
March11th to 20thNight
34%
720
20%
1980
10%
720
41%
720
26%
1313
March21st to endNight
33%
792
19%
2178
8%
792
42%
792
25%
1464
April1st to 10thNight
37%
720
24%
1980
12%
720
48%
720
31%
1219
April11th to 20thNight
42%
622
25%
1790
14%
622
51%
622
31%
1085
April21st to endNight
49%
540
29%
1620
19%
540
57%
540
33%
959
May1st to 10thNight
49%
540
18%
1620
10%
540
56%
540
28%
1021
May11th to 20thNight
46%
531
13%
1593
7%
531
50%
531
22%
1101
May21st to endNight
63%
582
17%
1744
13%
582
65%
582
26%
1150
June1st to 10thNight
64%
540
14%
1620
12%
540
65%
540
22%
1095
June11th to 20thNight
61%
540
14%
1620
10%
540
63%
540
29%
1055
June21st to endNight
68%
540
13%
1620
10%
540
70%
540
25%
1089
July1st to 10thNight
65%
525
9%
1575
8%
525
65%
525
19%
1158
July11th to 20thNight
68%
522
10%
1566
7%
522
69%
522
23%
1100
July21st to endNight
69%
591
13%
1672
11%
558
70%
558
23%
1162
August1st to 10thNight
63%
537
11%
1600
11%
534
63%
534
19%
1151
August11th to 20thNight
63%
534
15%
1598
12%
534
65%
534
20%
1137
August21st to endNight
61%
641
15%
1973
15%
641
62%
641
21%
1369
September1st to 10thNight
62%
720
17%
1980
14%
720
63%
720
27%
1351
September11th to 20thNight
54%
720
17%
1980
14%
720
56%
720
24%
1387
September21st to endNight
56%
720
24%
1980
17%
720
61%
720
30%
1283
October1st to 10thNight
52%
720
26%
1998
21%
720
58%
720
32%
1247
October11th to 20thNight
51%
720
27%
2160
23%
720
59%
720
31%
1288
October21st to endNight
51%
792
32%
2376
25%
792
62%
792
37%
1354
November1st to 10thNight
51%
740
29%
2297
23%
740
62%
740
34%
1304
November11th to 20thNight
41%
760
28%
2470
20%
760
54%
760
31%
1419
November21st to endNight
46%
760
27%
2470
19%
760
57%
760
29%
1459
December1st to 10thNight
38%
760
24%
2470
15%
760
50%
760
22%
1598
December11th to 20thNight
39%
759
28%
2894
16%
758
51%
758
25%
1615
December21st to endNight
31%
830
15%
4384
13%
817
43%
817
13%
2589

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
15%5%25%5%35%5%6%8%42%
74893
Night
16%5%25%5%3445%7%44%
74858
TransparencyDay
39%8%12%19%17%5%
74616
Night
39%7%11%19%19%6%
74654
SeeingDay
17%10%24%24%17%8%
13921
Night
17%6%23%30%20%4
24046

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 10thDay
19%424323346%51%
1706
11th to 20thDay
20%5%3432443446%
1638
21st to endDay
17%424323445%52%
1782
February1st to 10thDay
15%7%25%42445%7%45%
1724
11th to 20thDay
22%5%24433446%44%
1748
21st to endDay
22%5%25%5%2444442%
1480
March1st to 10thDay
17%5%23334346%50%
1930
11th to 20thDay
20%5%34434447%41%
1980
21st to endDay
18%7%244345%6%7%40%
2178
April1st to 10thDay
12%4245%3446%8%48%
1980
11th to 20thDay
15%4245%35%5%5%7%46%
2133
21st to endDay
13%424435%45%7%50%
2340
May1st to 10thDay
12%5%346%35%5%5%7%45%
2340
11th to 20thDay
16%5%25%6%45%6%7%6%37%
2301
21st to endDay
13%5%26%5%35%6%8%10%37%
2531
June1st to 10thDay
12%6%25%6%46%7%8%12%32%
2340
11th to 20thDay
7%5%25%5%47%7%10%10%37%
2340
21st to endDay
7%426%8%47%7%9%10%36%
2340
July1st to 10thDay
9%6%37%7%5%8%7%9%11%29%
2340
11th to 20thDay
10%5%35%7%5%8%9%9%12%28%
2340
21st to endDay
8%437%7%5%7%8%8%12%32%
2547
August1st to 10thDay
14%5%35%6%5%8%7%8%11%28%
2327
11th to 20thDay
12%5%25%7%47%8%8%11%32%
2303
21st to endDay
12%6%36%6%45%7%7%9%35%
2359
September1st to 10thDay
10%5%25%5%46%7%7%8%41%
1980
11th to 20thDay
14%6%36%7%36%5%6%8%37%
1980
21st to endDay
16%6%244345%5%7%43%
1980
October1st to 10thDay
16%424323346%54%
1962
11th to 20thDay
12%5%24223435%58%
1800
21st to endDay
15%412323345%57%
1980
November1st to 10thDay
13%423323335%59%
1777
11th to 20thDay
15%42432445%5%55%
1710
21st to endDay
17%42332435%6%51%
1710
December1st to 10thDay
22%7%25%424446%40%
1710
11th to 20thDay
18%5%23313345%51%
2153
21st to endDay
23%423323445%45%
3124
January1st to 10thNight
20%423434346%48%
2459
11th to 20thNight
19%5%25%43445%6%45%
2378
21st to endNight
16%6%24423345%49%
2574
February1st to 10thNight
17%5%245%23446%48%
2232
11th to 20thNight
19%6%24433445%46%
2098
21st to endNight
21%5%25%5%2445%7%41%
1776
March1st to 10thNight
15%7%2432445%5%49%
2029
11th to 20thNight
19%6%2442446%6%43%
1980
21st to endNight
18%5%35%5%3445%6%42%
2178
April1st to 10thNight
14%424424347%51%
1980
11th to 20thNight
14%5%25%423447%49%
1790
21st to endNight
14%4245%3335%7%52%
1620
May1st to 10thNight
12%5%35%5%35%5%5%8%45%
1620
11th to 20thNight
14%7%37%5%35%46%8%38%
1592
21st to endNight
13%6%346%35%5%6%9%40%
1744
June1st to 10thNight
11%5%36%5%46%7%9%11%33%
1620
11th to 20thNight
9%5%35%6%35%6%7%10%41%
1620
21st to endNight
9%5%26%6%46%7%6%12%37%
1620
July1st to 10thNight
11%6%36%7%5%8%7%8%10%29%
1620
11th to 20thNight
9%425%7%5%6%8%9%13%30%
1620
21st to endNight
7%437%7%5%6%6%9%11%34%
1771
August1st to 10thNight
13%6%27%7%36%6%7%10%33%
1611
11th to 20thNight
13%6%26%6%46%7%6%10%33%
1598
21st to endNight
13%7%36%6%45%6%6%10%35%
1973
September1st to 10thNight
11%6%36%6%35%6%6%8%39%
1980
11th to 20thNight
17%7%35%6%346%5%8%37%
1980
21st to endNight
17%425%43436%7%44%
1980
October1st to 10thNight
17%5%23433346%51%
1998
11th to 20thNight
15%424424445%52%
2160
21st to endNight
15%42332344456%
2376
November1st to 10thNight
14%413423335%57%
2297
11th to 20thNight
17%424323345%53%
2470
21st to endNight
17%423325%5%5%6%49%
2470
December1st to 10thNight
21%6%2443445%6%42%
2470
11th to 20thNight
17%5%14323335%54%
3042
21st to endNight
23%6%2442445%7%39%
4532

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 10thDay
37%47%22%22%7%
1707
11th to 20thDay
43%47%18%21%7%
1638
21st to endDay
36%37%22%24%8%
1782
February1st to 10thDay
41%49%21%19%7%
1724
11th to 20thDay
43%5%7%19%20%6%
1758
21st to endDay
46%6%7%14%19%9%
1480
March1st to 10thDay
36%5%7%20%23%9%
1930
11th to 20thDay
43%6%11%17%16%7%
1980
21st to endDay
43%7%10%20%17%3
2178
April1st to 10thDay
34%6%11%19%23%7%
1980
11th to 20thDay
36%7%9%19%20%9%
2133
21st to endDay
33%6%11%26%19%4
2340
May1st to 10thDay
36%8%14%19%18%5%
2340
11th to 20thDay
42%11%14%18%12%2
2305
21st to endDay
38%11%15%21%14%1
2531
June1st to 10thDay
41%12%17%21%8%1
2340
11th to 20thDay
36%14%19%20%10%1
2340
21st to endDay
39%12%17%19%11%3
2340
July1st to 10thDay
43%14%18%14%9%2
2275
11th to 20thDay
41%14%22%13%6%3
2271
21st to endDay
39%15%20%18%8%1
2405
August1st to 10thDay
46%14%15%19%6%
2314
11th to 20thDay
42%13%18%18%7%1
2303
21st to endDay
41%13%16%19%9%2
2359
September1st to 10thDay
37%11%14%18%16%3
1980
11th to 20thDay
43%9%13%15%19%2
1980
21st to endDay
39%7%10%20%18%7%
1980
October1st to 10thDay
32%5%11%18%28%6%
1962
11th to 20thDay
31%49%23%24%9%
1800
21st to endDay
30%46%21%27%11%
1980
November1st to 10thDay
30%38%19%29%11%
1777
11th to 20thDay
32%46%21%28%9%
1710
21st to endDay
34%6%6%21%24%8%
1710
December1st to 10thDay
47%46%19%19%5%
1710
11th to 20thDay
36%39%19%21%12%
2150
21st to endDay
40%49%20%23%4
3124
January1st to 10thNight
39%49%17%24%7%
2459
11th to 20thNight
41%6%8%16%23%5%
2378
21st to endNight
39%25%20%26%8%
2574
February1st to 10thNight
38%410%20%21%7%
2232
11th to 20thNight
42%5%5%19%23%6%
2099
21st to endNight
44%6%8%15%20%8%
1776
March1st to 10thNight
37%5%7%16%22%12%
2029
11th to 20thNight
41%7%11%15%19%7%
1980
21st to endNight
43%5%9%19%20%4
2178
April1st to 10thNight
36%49%19%26%6%
1980
11th to 20thNight
35%5%8%22%23%8%
1790
21st to endNight
33%6%10%26%21%4
1620
May1st to 10thNight
36%9%12%21%19%3
1620
11th to 20thNight
44%9%14%17%14%1
1593
21st to endNight
38%10%14%24%12%2
1745
June1st to 10thNight
41%11%17%21%8%2
1620
11th to 20thNight
36%10%20%22%11%1
1620
21st to endNight
38%13%19%15%12%4
1620
July1st to 10thNight
45%13%19%13%9%1
1575
11th to 20thNight
38%16%23%14%6%2
1566
21st to endNight
37%16%19%20%7%1
1672
August1st to 10thNight
44%14%18%17%8%
1600
11th to 20thNight
44%13%19%13%11%1
1598
21st to endNight
45%10%17%20%7%2
1973
September1st to 10thNight
41%9%14%20%13%3
1980
11th to 20thNight
44%9%13%16%16%2
1980
21st to endNight
39%6%10%21%18%6%
1980
October1st to 10thNight
35%5%11%15%28%5%
1998
11th to 20thNight
34%6%9%21%21%9%
2160
21st to endNight
31%45%21%28%12%
2376
November1st to 10thNight
32%47%19%26%12%
2297
11th to 20thNight
34%45%17%28%11%
2470
21st to endNight
35%5%6%20%26%8%
2470
December1st to 10thNight
44%48%17%19%7%
2470
11th to 20thNight
35%48%17%26%10%
3044
21st to endNight
44%48%19%19%4
4532

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 10thDay
24%19%37%18%1
270
11th to 20thDay
28%19%32%18%3
246
21st to endDay
22%24%45%6%3
264
February1st to 10thDay
20%25%38%16%1
240
11th to 20thDay
36%19%38%8%
240
21st to endDay
33%29%28%9%2
198
March1st to 10thDay
20%20%33%22%5%
370
11th to 20thDay
23%17%35%19%5%1
420
21st to endDay
26%18%31%19%6%
462
April1st to 10thDay
17%19%28%25%9%2
420
11th to 20thDay
16%15%32%24%11%2
412
21st to endDay
18%14%27%24%14%4
420
May1st to 10thDay
13%13%33%23%11%7%
423
11th to 20thDay
18%8%21%26%20%7%
447
21st to endDay
18%6%17%27%20%13%
485
June1st to 10thDay
13%5%18%34%18%12%
450
11th to 20thDay
9%6%18%24%28%16%
450
21st to endDay
9%419%31%21%16%
450
July1st to 10thDay
10%311%22%33%20%
445
11th to 20thDay
7%211%28%32%20%
444
21st to endDay
6%29%32%30%21%
488
August1st to 10thDay
19%314%23%25%17%
446
11th to 20thDay
13%210%29%31%15%
439
21st to endDay
15%314%24%29%15%
495
September1st to 10thDay
11%212%30%32%13%
450
11th to 20thDay
17%214%25%31%10%
450
21st to endDay
19%420%28%25%4
450
October1st to 10thDay
20%5%21%26%19%8%
450
11th to 20thDay
14%9%25%33%17%3
450
21st to endDay
19%8%24%32%15%2
495
November1st to 10thDay
22%10%24%29%12%3
375
11th to 20thDay
17%14%39%23%6%
270
21st to endDay
12%13%40%26%7%2
270
December1st to 10thDay
28%14%37%18%3
270
11th to 20thDay
23%13%37%21%5%
270
21st to endDay
30%17%34%14%41
297
January1st to 10thNight
22%9%35%29%5%
760
11th to 20thNight
23%8%36%28%6%
732
21st to endNight
19%10%38%29%3
792
February1st to 10thNight
19%10%36%31%4
720
11th to 20thNight
22%12%38%25%3
703
21st to endNight
22%13%35%26%4
592
March1st to 10thNight
19%11%34%31%5%
720
11th to 20thNight
20%10%32%28%8%1
720
21st to endNight
20%10%32%28%10%
792
April1st to 10thNight
16%13%30%31%10%1
720
11th to 20thNight
17%11%26%30%15%1
622
21st to endNight
14%6%26%34%20%2
540
May1st to 10thNight
13%5%25%33%22%1
540
11th to 20thNight
17%423%28%24%3
531
21st to endNight
16%210%29%35%8%
584
June1st to 10thNight
12%211%33%36%6%
540
11th to 20thNight
11%213%29%32%13%
540
21st to endNight
9%29%33%39%8%
540
July1st to 10thNight
13%27%22%44%11%
525
11th to 20thNight
10%27%24%44%14%
522
21st to endNight
8%27%27%47%10%
591
August1st to 10thNight
17%28%24%37%11%
537
11th to 20thNight
16%28%28%38%8%
534
21st to endNight
14%210%26%39%9%
641
September1st to 10thNight
13%212%28%36%9%
720
11th to 20thNight
19%315%24%33%6%
720
21st to endNight
18%315%36%25%3
720
October1st to 10thNight
18%5%19%26%24%7%
720
11th to 20thNight
17%6%20%34%20%3
720
21st to endNight
17%5%22%35%17%4
792
November1st to 10thNight
16%5%23%35%17%4
740
11th to 20thNight
19%6%29%31%13%1
760
21st to endNight
18%6%27%35%13%1
760
December1st to 10thNight
23%8%26%34%8%
760
11th to 20thNight
19%7%30%36%8%
760
21st to endNight
27%8%27%31%7%
836
Page generated at 2024-01-10 10:16:10. Version ac07

Copyright 2024 Attilla Danko


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