Copper Breaks State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Copper Breaks State Park clear sky chart from 2005-11-06 to 2024-03-28.

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
49%
24403
30%
79846
19%
24304
61%
24304
40%
40620

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
43%
942
33%
3971
12%
926
56%
926
32%
1942
January11th to 20thNight
44%
946
34%
3929
15%
930
55%
930
38%
1632
January21st to endNight
42%
945
25%
4310
16%
933
57%
933
27%
2299
February1st to 10thNight
35%
760
32%
2280
13%
760
51%
760
38%
1236
February11th to 20thNight
34%
744
29%
2218
12%
740
48%
740
39%
1185
February21st to endNight
27%
628
32%
1884
8%
628
46%
628
36%
1012
March1st to 10thNight
32%
732
29%
2252
12%
732
47%
732
35%
1242
March11th to 20thNight
32%
570
29%
2090
16%
570
50%
570
32%
1065
March21st to endNight
31%
615
28%
2255
14%
615
51%
615
36%
1092
April1st to 10thNight
28%
540
31%
1895
13%
540
51%
540
37%
937
April11th to 20thNight
26%
533
28%
1777
11%
533
48%
533
36%
927
April21st to endNight
34%
540
32%
1683
15%
540
57%
540
41%
864
May1st to 10thNight
32%
540
29%
1620
14%
540
53%
540
39%
878
May11th to 20thNight
42%
531
21%
1594
16%
531
52%
531
38%
894
May21st to endNight
46%
583
26%
1745
18%
582
61%
582
40%
952
June1st to 10thNight
59%
540
23%
1620
18%
540
68%
540
45%
834
June11th to 20thNight
53%
540
26%
1620
20%
540
62%
540
49%
802
June21st to endNight
63%
540
28%
1620
28%
540
69%
540
52%
795
July1st to 10thNight
74%
525
20%
1575
22%
525
77%
525
39%
887
July11th to 20thNight
83%
522
31%
1566
32%
522
86%
522
58%
724
July21st to endNight
87%
591
33%
1673
37%
558
87%
558
54%
797
August1st to 10thNight
84%
537
35%
1601
39%
534
87%
534
58%
740
August11th to 20thNight
74%
534
27%
1778
33%
534
77%
534
38%
935
August21st to endNight
83%
594
31%
1980
35%
594
85%
594
52%
906
September1st to 10thNight
72%
540
26%
1928
29%
540
75%
540
38%
975
September11th to 20thNight
60%
540
27%
1980
26%
540
66%
540
32%
1074
September21st to endNight
67%
540
35%
1980
33%
540
74%
540
41%
960
October1st to 10thNight
57%
540
35%
1980
31%
540
65%
540
40%
929
October11th to 20thNight
50%
594
38%
2034
22%
594
65%
594
45%
958
October21st to endNight
50%
814
37%
2398
19%
814
61%
814
49%
1188
November1st to 10thNight
52%
925
34%
2405
13%
925
62%
925
56%
1229
November11th to 20thNight
48%
950
35%
2470
15%
950
59%
950
55%
1269
November21st to endNight
45%
950
34%
2470
15%
950
56%
950
46%
1383
December1st to 10thNight
48%
950
37%
2470
19%
950
58%
950
47%
1345
December11th to 20thNight
40%
949
34%
2869
14%
948
52%
948
37%
1599
December21st to endNight
39%
1039
22%
4326
14%
1026
52%
1026
30%
2134

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
8%42442445%6%59%
79236
Night
7%42332345%7%60%
80834
TransparencyDay
26%5%9%23%26%11%
78961
Night
24%5%9%22%27%14%
80629
SeeingDay
9%6%24%32%23%6%
14313
Night
8%7%32%38%14%1
24433

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
6%5%24433345%60%
2847
11th to 20thDay
6%5%12322345%67%
2850
21st to endDay
13%7%24423345%54%
3307
February1st to 10thDay
8%5%25%323336%58%
1900
11th to 20thDay
9%5%35%433346%58%
1849
21st to endDay
10%8%2332334457%
1570
March1st to 10thDay
11%4244245%5%7%53%
1927
11th to 20thDay
12%5%23323335%58%
2090
21st to endDay
7%425%434446%57%
2255
April1st to 10thDay
7%313334346%63%
2060
11th to 20thDay
12%424424345%55%
2134
21st to endDay
9%413423446%59%
2276
May1st to 10thDay
10%414423446%57%
2340
11th to 20thDay
11%423324447%56%
2302
21st to endDay
7%5%245%35%5%5%7%52%
2531
June1st to 10thDay
5%3245%3446%8%58%
2340
11th to 20thDay
5%21343446%8%60%
2340
21st to endDay
5%22333446%6%63%
2340
July1st to 10thDay
6%213435%6%6%9%53%
2340
11th to 20thDay
421342345%9%65%
2340
21st to endDay
3223435%5%6%10%58%
2546
August1st to 10thDay
33134345%5%8%61%
2324
11th to 20thDay
6%3234345%6%9%54%
2123
21st to endDay
5%313435%5%6%7%59%
2376
September1st to 10thDay
10%31332345%6%60%
2030
11th to 20thDay
10%425%6%345%5%7%49%
1980
21st to endDay
8%41342345%5%61%
1980
October1st to 10thDay
7%31242445%6%63%
1980
11th to 20thDay
9%31331233467%
1906
21st to endDay
10%42332333464%
1954
November1st to 10thDay
8%313323347%64%
1673
11th to 20thDay
5%312212346%69%
1710
21st to endDay
10%5%23313345%62%
1710
December1st to 10thDay
7%5%36%323446%59%
1710
11th to 20thDay
9%424434445%57%
2161
21st to endDay
10%5%25%42445%5%55%
3135
January1st to 10thNight
9%5%24423346%58%
4108
11th to 20thNight
4323323345%68%
4120
21st to endNight
12%8%24423345%54%
4390
February1st to 10thNight
9%5%24423345%59%
2280
11th to 20thNight
8%5%24323347%59%
2218
21st to endNight
8%43433335%6%58%
1884
March1st to 10thNight
8%5%25%43345%6%55%
2252
11th to 20thNight
12%41332335%6%58%
2090
21st to endNight
6%41442345%7%60%
2255
April1st to 10thNight
6%414424447%62%
1895
11th to 20thNight
11%314323447%58%
1777
21st to endNight
7%41342335%7%61%
1683
May1st to 10thNight
8%42332445%6%59%
1620
11th to 20thNight
8%3234245%6%8%55%
1593
21st to endNight
6%3133345%5%9%57%
1745
June1st to 10thNight
5%3133335%7%11%57%
1620
11th to 20thNight
33133245%7%11%58%
1620
21st to endNight
421332445%7%64%
1620
July1st to 10thNight
34235%45%7%6%11%51%
1620
11th to 20thNight
411222345%9%67%
1620
21st to endNight
21133245%7%11%60%
1772
August1st to 10thNight
12133245%6%11%63%
1611
11th to 20thNight
5%314335%6%8%11%49%
1778
21st to endNight
321332346%11%62%
1980
September1st to 10thNight
8%3233335%47%58%
1928
11th to 20thNight
10%6%245%235%48%50%
1980
21st to endNight
7%3133345%46%62%
1980
October1st to 10thNight
7%324323446%63%
1980
11th to 20thNight
8%32331222469%
2034
21st to endNight
8%213323235%69%
2398
November1st to 10thNight
6%312222346%69%
2405
11th to 20thNight
4313323446%68%
2470
21st to endNight
8%413423346%62%
2470
December1st to 10thNight
9%413222345%65%
2470
11th to 20thNight
8%424434446%58%
3036
21st to endNight
7%5%25%5%24445%57%
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
26%47%25%27%12%
2848
11th to 20thDay
21%37%24%36%9%
2850
21st to endDay
35%35%24%26%7%
3307
February1st to 10thDay
28%48%21%30%10%
1900
11th to 20thDay
30%36%23%24%13%
1859
21st to endDay
31%3416%28%18%
1570
March1st to 10thDay
31%5%7%16%26%15%
1927
11th to 20thDay
29%49%22%24%11%
2090
21st to endDay
29%48%23%24%12%
2255
April1st to 10thDay
24%48%22%26%16%
2060
11th to 20thDay
31%5%8%17%23%16%
2134
21st to endDay
26%5%10%22%28%9%
2276
May1st to 10thDay
29%5%9%19%24%14%
2340
11th to 20thDay
29%7%11%24%22%7%
2306
21st to endDay
30%9%12%23%21%6%
2531
June1st to 10thDay
25%7%14%28%19%8%
2340
11th to 20thDay
21%7%12%25%27%10%
2340
21st to endDay
22%5%12%24%27%10%
2340
July1st to 10thDay
27%8%14%26%22%4
2276
11th to 20thDay
17%5%9%29%32%8%
2271
21st to endDay
18%7%14%30%27%3
2405
August1st to 10thDay
18%6%12%29%25%10%
2310
11th to 20thDay
25%8%15%25%20%7%
2123
21st to endDay
22%7%14%24%23%9%
2376
September1st to 10thDay
26%5%9%23%26%12%
2030
11th to 20thDay
34%6%10%19%23%9%
1980
21st to endDay
24%48%21%31%12%
1980
October1st to 10thDay
22%6%11%24%24%14%
1980
11th to 20thDay
22%46%15%31%22%
1906
21st to endDay
25%36%22%28%16%
1954
November1st to 10thDay
22%37%22%30%16%
1673
11th to 20thDay
18%36%24%33%15%
1710
21st to endDay
27%25%19%30%16%
1710
December1st to 10thDay
28%37%25%26%10%
1710
11th to 20thDay
30%311%16%29%12%
2159
21st to endDay
30%49%20%27%10%
3135
January1st to 10thNight
28%37%26%27%9%
4108
11th to 20thNight
19%411%21%33%12%
4120
21st to endNight
33%47%18%27%11%
4390
February1st to 10thNight
28%38%20%28%14%
2280
11th to 20thNight
27%37%21%25%17%
2218
21st to endNight
27%45%16%26%22%
1884
March1st to 10thNight
30%47%16%23%20%
2252
11th to 20thNight
28%5%7%22%24%15%
2090
21st to endNight
24%5%10%25%24%12%
2255
April1st to 10thNight
24%48%19%25%20%
1895
11th to 20thNight
26%5%10%18%25%15%
1777
21st to endNight
23%5%10%24%26%11%
1683
May1st to 10thNight
26%6%10%20%21%18%
1620
11th to 20thNight
26%8%15%21%19%11%
1594
21st to endNight
24%8%14%23%23%9%
1746
June1st to 10thNight
20%7%16%29%20%7%
1620
11th to 20thNight
19%5%14%25%27%9%
1620
21st to endNight
19%411%24%27%14%
1620
July1st to 10thNight
25%9%14%27%19%6%
1575
11th to 20thNight
14%5%9%25%33%14%
1566
21st to endNight
15%6%13%31%29%5%
1673
August1st to 10thNight
14%5%11%26%31%13%
1601
11th to 20thNight
24%8%15%24%23%6%
1778
21st to endNight
17%5%13%28%25%12%
1980
September1st to 10thNight
26%5%10%19%26%14%
1928
11th to 20thNight
32%5%12%18%22%11%
1980
21st to endNight
24%47%20%28%17%
1980
October1st to 10thNight
22%5%10%21%26%16%
1980
11th to 20thNight
22%35%15%29%26%
2034
21st to endNight
20%36%20%31%19%
2398
November1st to 10thNight
18%38%22%29%19%
2405
11th to 20thNight
18%46%21%34%17%
2470
21st to endNight
25%46%18%31%17%
2470
December1st to 10thNight
23%37%23%28%15%
2470
11th to 20thNight
28%47%18%31%13%
3037
21st to endNight
28%47%20%28%13%
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
8%10%43%28%10%1
270
11th to 20thDay
14%13%29%31%12%
270
21st to endDay
10%12%36%31%10%1
297
February1st to 10thDay
14%11%36%30%8%1
270
11th to 20thDay
11%9%45%26%8%
270
21st to endDay
19%16%34%27%5%
225
March1st to 10thDay
11%10%39%32%8%
270
11th to 20thDay
16%13%38%22%9%2
270
21st to endDay
11%12%42%26%9%
285
April1st to 10thDay
11%13%42%23%11%
320
11th to 20thDay
13%14%46%24%3
412
21st to endDay
10%14%40%27%8%2
536
May1st to 10thDay
9%7%40%34%9%1
603
11th to 20thDay
12%6%30%32%17%3
625
21st to endDay
9%8%28%35%17%4
679
June1st to 10thDay
6%317%43%26%6%
630
11th to 20thDay
4220%46%24%3
630
21st to endDay
3214%41%32%7%
630
July1st to 10thDay
5%17%36%37%15%
621
11th to 20thDay
316%33%46%11%
618
21st to endDay
31431%45%16%
684
August1st to 10thDay
5%16%34%42%12%
622
11th to 20thDay
5%18%37%36%13%
437
21st to endDay
416%30%42%17%
495
September1st to 10thDay
10%2429%37%19%
320
11th to 20thDay
6%19%32%37%16%
270
21st to endDay
12%39%30%34%13%
270
October1st to 10thDay
4322%32%35%4
270
11th to 20thDay
9%5%28%36%20%2
270
21st to endDay
19%7%25%30%17%2
297
November1st to 10thDay
13%334%29%18%3
270
11th to 20thDay
11%8%27%30%19%4
270
21st to endDay
17%10%32%24%13%3
270
December1st to 10thDay
9%7%40%31%12%1
270
11th to 20thDay
8%10%32%37%11%2
270
21st to endDay
16%12%39%23%8%1
297
January1st to 10thNight
8%8%37%38%9%
950
11th to 20thNight
9%9%33%40%9%
950
21st to endNight
9%8%37%38%8%
955
February1st to 10thNight
11%9%40%32%8%
760
11th to 20thNight
11%10%42%31%6%
744
21st to endNight
11%13%46%26%3
628
March1st to 10thNight
9%12%43%31%5%
732
11th to 20thNight
14%12%40%28%6%
570
21st to endNight
7%14%46%30%3
615
April1st to 10thNight
8%9%52%27%4
540
11th to 20thNight
12%12%49%24%3
533
21st to endNight
8%10%47%29%6%
540
May1st to 10thNight
8%8%48%30%5%
540
11th to 20thNight
9%6%40%32%13%1
531
21st to endNight
6%6%38%38%11%1
584
June1st to 10thNight
5%329%48%14%1
540
11th to 20thNight
3236%52%8%
540
21st to endNight
4226%44%24%1
540
July1st to 10thNight
4112%47%34%2
525
11th to 20thNight
419%52%32%2
522
21st to endNight
31450%41%2
591
August1st to 10thNight
18%53%36%1
537
11th to 20thNight
6%110%46%36%1
534
21st to endNight
317%46%40%4
594
September1st to 10thNight
7%112%46%31%2
540
11th to 20thNight
11%217%41%28%1
540
21st to endNight
8%220%45%24%1
540
October1st to 10thNight
7%427%41%19%1
540
11th to 20thNight
8%435%41%11%1
594
21st to endNight
8%8%32%35%16%
814
November1st to 10thNight
8%5%32%39%14%1
925
11th to 20thNight
5%7%37%39%11%1
950
21st to endNight
11%7%34%36%11%1
950
December1st to 10thNight
10%9%30%40%10%
950
11th to 20thNight
12%7%37%37%7%
950
21st to endNight
11%7%38%36%7%
1045
Page generated at 2024-03-24 22:36:57. Version ac07

Copyright © 2024 Attilla Danko.


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