Robber's Cave State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Robber's Cave State Park clear sky chart from 2005-11-06 to 2024-01-14.

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%
24175
27%
74315
17%
24114
53%
24114
32%
42628

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%
949
28%
2458
10%
946
42%
946
31%
1521
January11th to 20thNight
26%
918
27%
2386
9%
918
38%
918
31%
1480
January21st to endNight
31%
990
32%
2574
11%
990
44%
990
33%
1539
February1st to 10thNight
26%
900
22%
2340
7%
900
35%
900
26%
1531
February11th to 20thNight
22%
781
21%
2176
6%
777
32%
777
24%
1398
February21st to endNight
24%
505
28%
1689
11%
505
39%
505
21%
1010
March1st to 10thNight
32%
540
25%
1980
16%
540
44%
540
22%
1155
March11th to 20thNight
27%
540
22%
1980
13%
540
39%
540
21%
1176
March21st to endNight
27%
594
22%
2178
13%
594
43%
594
21%
1302
April1st to 10thNight
29%
540
23%
1954
15%
540
43%
540
23%
1093
April11th to 20thNight
33%
533
26%
1775
17%
533
47%
533
28%
1003
April21st to endNight
30%
540
23%
1740
12%
540
47%
540
27%
1035
May1st to 10thNight
38%
540
23%
1620
17%
540
49%
540
31%
969
May11th to 20thNight
43%
531
22%
1594
17%
531
52%
531
31%
957
May21st to endNight
44%
584
22%
1746
15%
582
56%
582
32%
1043
June1st to 10thNight
68%
540
24%
1620
22%
540
73%
540
44%
845
June11th to 20thNight
57%
540
25%
1620
20%
540
65%
540
47%
828
June21st to endNight
68%
540
29%
1620
26%
540
74%
540
55%
765
July1st to 10thNight
73%
525
22%
1575
23%
525
75%
525
39%
874
July11th to 20thNight
79%
522
28%
1566
30%
522
83%
522
55%
731
July21st to endNight
79%
591
28%
1673
31%
558
81%
558
49%
845
August1st to 10thNight
71%
537
26%
1601
28%
534
76%
534
46%
829
August11th to 20thNight
71%
534
32%
1600
35%
534
75%
534
42%
873
August21st to endNight
76%
594
26%
1962
30%
594
78%
594
43%
987
September1st to 10thNight
70%
540
29%
1892
31%
540
74%
540
40%
951
September11th to 20thNight
64%
540
28%
1980
27%
540
71%
540
32%
1067
September21st to endNight
62%
540
35%
1980
31%
540
71%
540
41%
935
October1st to 10thNight
59%
664
33%
2104
25%
664
67%
664
42%
1080
October11th to 20thNight
41%
720
33%
2160
17%
720
54%
720
37%
1180
October21st to endNight
40%
792
31%
2376
17%
792
50%
792
32%
1390
November1st to 10thNight
40%
740
33%
2220
16%
740
54%
740
38%
1201
November11th to 20thNight
38%
841
30%
2361
15%
841
49%
841
38%
1317
November21st to endNight
31%
950
29%
2470
13%
950
42%
950
32%
1530
December1st to 10thNight
32%
950
28%
2470
11%
950
43%
950
31%
1549
December11th to 20thNight
29%
949
29%
2878
11%
948
39%
948
24%
1817
December21st to endNight
28%
1041
17%
4397
9%
1026
41%
1026
16%
2822

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
11%6%35%5%3445%7%47%
74972
Night
10%5%24423447%53%
74813
TransparencyDay
37%5%10%24%20%5%
74696
Night
32%410%24%23%7%
74609
SeeingDay
15%12%27%27%15%4
14210
Night
14%12%26%31%15%2
24181

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
11%9%36%32335%5%49%
1707
11th to 20thDay
11%8%35%5%1445%5%49%
1647
21st to endDay
14%8%35%323345%49%
1782
February1st to 10thDay
17%11%45%43443442%
1620
11th to 20thDay
14%9%47%5%34446%42%
1687
21st to endDay
20%10%46%322345%41%
1565
March1st to 10thDay
13%7%36%5%35%335%47%
1980
11th to 20thDay
17%9%36%5%24345%42%
1980
21st to endDay
16%10%35%5%2445%7%39%
2178
April1st to 10thDay
11%5%35%5%35%5%5%7%46%
2006
11th to 20thDay
16%7%35%43435%5%45%
2134
21st to endDay
19%7%46%5%34346%41%
2216
May1st to 10thDay
15%6%36%5%34446%44%
2340
11th to 20thDay
13%6%26%5%445%6%7%41%
2302
21st to endDay
12%5%36%6%45%6%6%9%39%
2531
June1st to 10thDay
9%5%25%5%35%6%6%8%46%
2340
11th to 20thDay
7%435%6%35%6%6%9%47%
2340
21st to endDay
43235%3446%8%57%
2340
July1st to 10thDay
7%326%6%5%6%6%7%11%40%
2340
11th to 20thDay
42145%35%6%6%10%54%
2340
21st to endDay
5%3246%46%6%7%9%48%
2546
August1st to 10thDay
4426%5%35%6%7%10%49%
2328
11th to 20thDay
9%5%25%435%5%6%8%48%
2301
21st to endDay
5%415%5%45%6%7%10%48%
2393
September1st to 10thDay
10%4244345%46%52%
2064
11th to 20thDay
12%4245%25%5%5%8%48%
1980
21st to endDay
8%3134345%5%6%57%
1980
October1st to 10thDay
7%5%25%43445%7%55%
1836
11th to 20thDay
12%5%24333325%60%
1800
21st to endDay
17%7%24323335%51%
1980
November1st to 10thDay
9%6%23314447%57%
1858
11th to 20thDay
10%5%24323335%59%
1815
21st to endDay
15%6%33423347%50%
1710
December1st to 10thDay
14%7%35%5%23346%48%
1710
11th to 20thDay
15%9%35%5%33446%44%
2161
21st to endDay
15%12%5%7%5%34445%35%
3135
January1st to 10thNight
11%7%35%433336%52%
2458
11th to 20thNight
13%7%35%323346%52%
2386
21st to endNight
12%7%24323345%56%
2574
February1st to 10thNight
14%10%35%33345%6%46%
2340
11th to 20thNight
14%7%36%424345%46%
2175
21st to endNight
14%10%35%413346%47%
1689
March1st to 10thNight
14%6%25%43445%6%47%
1980
11th to 20thNight
17%8%33423346%47%
1980
21st to endNight
13%6%25%435%446%47%
2178
April1st to 10thNight
12%5%344335%47%50%
1954
11th to 20thNight
12%6%34423347%51%
1775
21st to endNight
15%5%334345%47%48%
1740
May1st to 10thNight
10%4345%2445%9%48%
1620
11th to 20thNight
12%4244345%6%8%47%
1593
21st to endNight
10%424435%5%6%9%48%
1745
June1st to 10thNight
431343446%10%59%
1620
11th to 20thNight
5%3133235%5%8%61%
1620
21st to endNight
222332345%9%67%
1620
July1st to 10thNight
4224435%6%8%12%50%
1620
11th to 20thNight
22132235%6%10%64%
1620
21st to endNight
32244246%6%12%57%
1772
August1st to 10thNight
22145%35%5%6%10%57%
1611
11th to 20thNight
4425%426%5%6%9%55%
1600
21st to endNight
43234245%6%8%58%
1962
September1st to 10thNight
8%42342345%7%58%
1892
11th to 20thNight
10%5%243345%6%7%52%
1980
21st to endNight
7%31333435%6%62%
1980
October1st to 10thNight
6%424424446%61%
2104
11th to 20thNight
12%41333233461%
2160
21st to endNight
17%6%2332322456%
2376
November1st to 10thNight
10%424423335%61%
2220
11th to 20thNight
8%5%24413345%59%
2361
21st to endNight
14%6%24323446%52%
2470
December1st to 10thNight
13%6%35%423346%50%
2470
11th to 20thNight
13%7%46%5%23345%49%
3036
21st to endNight
14%9%5%8%5%34445%41%
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%38%24%23%4
1708
11th to 20thDay
37%48%25%23%3
1647
21st to endDay
38%36%26%22%5%
1782
February1st to 10thDay
49%39%17%18%4
1620
11th to 20thDay
46%37%23%17%5%
1696
21st to endDay
47%35%15%21%8%
1565
March1st to 10thDay
41%37%19%18%11%
1980
11th to 20thDay
47%37%21%15%6%
1980
21st to endDay
46%5%9%23%14%3
2178
April1st to 10thDay
39%5%11%21%19%6%
2006
11th to 20thDay
41%49%24%17%5%
2134
21st to endDay
46%5%8%20%19%2
2216
May1st to 10thDay
42%5%10%23%18%3
2340
11th to 20thDay
41%6%12%25%14%1
2306
21st to endDay
42%7%13%24%14%1
2531
June1st to 10thDay
34%8%14%27%14%3
2340
11th to 20thDay
32%7%13%27%19%2
2340
21st to endDay
24%6%14%29%24%4
2340
July1st to 10thDay
35%8%17%24%14%1
2276
11th to 20thDay
23%8%13%32%21%3
2271
21st to endDay
27%9%15%33%15%
2405
August1st to 10thDay
29%8%15%28%19%2
2314
11th to 20thDay
33%7%14%24%21%2
2301
21st to endDay
28%8%14%30%17%3
2393
September1st to 10thDay
33%5%8%24%22%9%
2064
11th to 20thDay
33%6%11%22%20%7%
1980
21st to endDay
27%5%8%24%29%8%
1980
October1st to 10thDay
29%5%11%20%26%9%
1836
11th to 20thDay
31%36%18%31%12%
1800
21st to endDay
39%37%22%21%9%
1980
November1st to 10thDay
29%39%25%27%7%
1858
11th to 20thDay
30%38%25%26%8%
1815
21st to endDay
36%37%21%26%6%
1710
December1st to 10thDay
38%39%26%19%4
1710
11th to 20thDay
43%35%19%24%6%
2159
21st to endDay
49%5%7%18%17%4
3135
January1st to 10thNight
35%38%22%27%5%
2458
11th to 20thNight
35%39%22%25%5%
2386
21st to endNight
32%36%25%27%7%
2574
February1st to 10thNight
41%49%23%17%6%
2340
11th to 20thNight
42%35%25%20%5%
2176
21st to endNight
41%37%19%22%9%
1689
March1st to 10thNight
39%37%18%21%12%
1980
11th to 20thNight
40%410%20%19%7%
1980
21st to endNight
40%5%9%24%18%4
2178
April1st to 10thNight
35%5%10%21%19%10%
1954
11th to 20thNight
33%49%25%19%9%
1775
21st to endNight
36%5%10%24%22%2
1740
May1st to 10thNight
34%5%13%23%18%6%
1620
11th to 20thNight
34%5%14%27%17%2
1594
21st to endNight
32%7%15%28%16%2
1746
June1st to 10thNight
23%5%15%33%21%3
1620
11th to 20thNight
20%6%13%32%25%4
1620
21st to endNight
16%5%14%30%30%6%
1620
July1st to 10thNight
23%10%16%28%21%2
1575
11th to 20thNight
14%7%14%34%27%4
1566
21st to endNight
19%7%17%34%23%1
1673
August1st to 10thNight
21%6%15%32%22%3
1601
11th to 20thNight
25%7%12%27%26%4
1600
21st to endNight
22%6%14%30%22%5%
1962
September1st to 10thNight
26%49%28%23%11%
1892
11th to 20thNight
30%6%9%22%24%9%
1980
21st to endNight
22%5%7%24%30%11%
1980
October1st to 10thNight
25%5%11%24%25%12%
2104
11th to 20thNight
29%36%16%30%16%
2160
21st to endNight
35%25%20%25%12%
2376
November1st to 10thNight
27%47%25%26%10%
2220
11th to 20thNight
28%38%23%27%10%
2361
21st to endNight
35%37%20%28%7%
2470
December1st to 10thNight
36%49%22%22%7%
2470
11th to 20thNight
40%35%20%23%8%
3037
21st to endNight
45%5%7%19%19%6%
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%22%33%16%5%
270
11th to 20thDay
25%26%35%11%2
249
21st to endDay
21%29%31%13%5%
264
February1st to 10thDay
25%25%36%9%4
240
11th to 20thDay
30%27%33%7%3
240
21st to endDay
38%26%24%10%2
198
March1st to 10thDay
21%28%34%15%1
240
11th to 20thDay
30%27%29%12%3
240
21st to endDay
26%29%33%9%3
264
April1st to 10thDay
16%30%38%11%41
266
11th to 20thDay
26%21%32%15%6%
412
21st to endDay
25%22%32%15%6%1
476
May1st to 10thDay
18%14%43%19%6%
603
11th to 20thDay
18%11%34%25%10%1
625
21st to endDay
13%9%36%24%15%4
679
June1st to 10thDay
10%5%23%35%21%6%
630
11th to 20thDay
8%5%27%37%18%4
630
21st to endDay
35%30%38%20%4
630
July1st to 10thDay
8%218%37%26%9%
621
11th to 20thDay
4117%41%30%7%
618
21st to endDay
4110%43%33%9%
684
August1st to 10thDay
7%316%43%28%5%
626
11th to 20thDay
11%216%40%27%5%
615
21st to endDay
6%110%37%35%12%
512
September1st to 10thDay
8%211%35%35%9%
354
11th to 20thDay
6%319%38%27%7%
270
21st to endDay
14%6%21%33%21%6%
270
October1st to 10thDay
6%10%34%30%15%4
270
11th to 20thDay
14%15%39%26%5%1
270
21st to endDay
34%13%29%19%5%
297
November1st to 10thDay
14%16%40%21%8%1
270
11th to 20thDay
17%21%37%18%5%1
270
21st to endDay
24%20%38%13%41
270
December1st to 10thDay
21%24%32%17%41
270
11th to 20thDay
28%21%34%14%4
270
21st to endDay
23%24%36%12%4
297
January1st to 10thNight
17%19%31%26%7%1
950
11th to 20thNight
18%20%32%25%4
918
21st to endNight
15%19%30%30%5%
990
February1st to 10thNight
21%20%31%24%5%
900
11th to 20thNight
21%19%35%22%3
781
21st to endNight
25%19%30%24%3
505
March1st to 10thNight
19%16%28%32%4
540
11th to 20thNight
21%16%32%25%5%
540
21st to endNight
18%18%33%25%6%
594
April1st to 10thNight
16%21%31%26%6%
540
11th to 20thNight
16%17%31%27%9%
533
21st to endNight
20%12%36%22%9%1
540
May1st to 10thNight
11%15%32%33%8%
540
11th to 20thNight
14%8%29%33%15%1
531
21st to endNight
12%7%30%28%20%3
584
June1st to 10thNight
6%415%38%35%3
540
11th to 20thNight
6%329%41%20%1
540
21st to endNight
3122%40%29%5%
540
July1st to 10thNight
5%12%39%37%6%
525
11th to 20thNight
2113%41%37%6%
522
21st to endNight
319%41%41%5%
591
August1st to 10thNight
3115%43%34%3
537
11th to 20thNight
6%112%40%37%5%
534
21st to endNight
6%29%37%41%6%
594
September1st to 10thNight
9%111%36%38%4
540
11th to 20thNight
12%214%32%36%4
540
21st to endNight
7%422%31%32%5%
540
October1st to 10thNight
9%422%34%27%4
664
11th to 20thNight
15%10%29%32%13%1
720
21st to endNight
22%11%25%27%14%1
792
November1st to 10thNight
12%12%33%30%11%1
740
11th to 20thNight
13%15%32%31%10%
841
21st to endNight
20%17%29%26%8%
950
December1st to 10thNight
20%15%29%29%7%
950
11th to 20thNight
21%13%32%28%5%
950
21st to endNight
17%22%30%27%5%
1045
Page generated at 2024-01-11 03:22:43. Version ac07

Copyright 2024 Attilla Danko


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