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 2005-11-05 to 2017-08-12.

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
51%
15555
31%
46568
20%
15510
62%
15510
44%
24177

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
47%
899
32%
2327
15%
895
58%
895
47%
1288
January16th to endNight
45%
903
38%
2439
17%
903
58%
903
50%
1287
February1st to 15thNight
41%
704
29%
2112
15%
700
53%
700
40%
1119
February16th to endNight
33%
632
34%
1894
11%
632
52%
632
42%
973
March1st to 15thNight
34%
642
30%
2082
14%
642
49%
642
35%
1117
March16th to endNight
35%
576
28%
2112
17%
576
50%
576
36%
1040
April1st to 15thNight
29%
539
28%
1861
13%
539
49%
539
35%
951
April16th to endNight
34%
540
31%
1722
15%
540
56%
540
42%
868
May1st to 15thNight
37%
539
28%
1620
16%
539
54%
539
39%
878
May16th to endNight
49%
562
28%
1684
21%
561
63%
561
44%
885
June1st to 15thNight
55%
540
23%
1620
17%
540
65%
540
48%
815
June16th to endNight
62%
540
27%
1620
25%
540
68%
540
49%
809
July1st to 15thNight
76%
510
21%
1530
23%
510
79%
510
44%
810
July16th to endNight
87%
564
33%
1594
37%
531
88%
531
56%
749
August1st to 15thNight
86%
527
33%
1631
41%
524
87%
524
53%
771
August16th to endNight
79%
525
27%
1750
31%
525
81%
525
44%
876
September1st to 15thNight
64%
495
23%
1785
26%
495
68%
495
30%
1010
September16th to endNight
68%
492
32%
1815
31%
492
73%
492
36%
928
October1st to 15thNight
54%
495
36%
1815
31%
495
64%
495
40%
877
October16th to endNight
56%
696
39%
2104
22%
696
67%
696
55%
972
November1st to 15thNight
52%
875
34%
2275
14%
875
62%
875
56%
1164
November16th to endNight
49%
900
37%
2340
17%
900
59%
900
51%
1260
December1st to 15thNight
49%
900
35%
2340
19%
900
58%
900
48%
1272
December16th to endNight
43%
960
33%
2496
15%
960
54%
960
41%
1458

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
7%313323346%58%
47404
Night
6%313323346%61%
46764
Cloud CoverDay
7%313323346%58%
47402
Night
6%313323346%61%
46764
TransparencyDay
26%49%22%26%11%
47102
Night
23%49%21%26%14%
46569
SeeingDay
8%422%34%25%5%
5504
Night
8%5%30%38%16%
15558

By Month

Percentage Cloud Cover SW (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
7%413312235%62%
1611
16th to endDay
7%313323335%61%
1795
February1st to 15thDay
7%5%2331223462%
1750
16th to endDay
8%5%23212335%59%
1580
March1st to 15thDay
10%5%123235%46%54%
1878
16th to endDay
8%423313335%59%
2112
April1st to 15thDay
8%312323346%59%
2084
16th to endDay
10%212323335%60%
2238
May1st to 15thDay
12%213414345%54%
2331
16th to endDay
7%423325%45%7%53%
2430
June1st to 15thDay
5%31442445%7%57%
2340
16th to endDay
5%2123245%5%7%58%
2340
July1st to 15thDay
7%213425%5%6%9%51%
2340
16th to endDay
32232345%7%62%
2466
August1st to 15thDay
31242445%7%60%
2230
16th to endDay
5%213425%5%5%7%56%
2100
September1st to 15thDay
12%3245%25%45%7%48%
1845
16th to endDay
7%32242345%6%58%
1815
October1st to 15thDay
10%31232344460%
1815
16th to endDay
421222233470%
1753
November1st to 15thDay
5%211212337%67%
1583
16th to endDay
8%31321223467%
1620
December1st to 15thDay
8%5%14322345%57%
1620
16th to endDay
11%413313245%56%
1728
January1st to 15thNight
7%313313335%63%
2327
16th to endNight
6%312213335%65%
2439
February1st to 15thNight
8%423222235%61%
2102
16th to endNight
8%313222245%62%
1894
March1st to 15thNight
9%41432335%457%
2082
16th to endNight
8%323322346%60%
2112
April1st to 15thNight
7%313323346%59%
1861
16th to endNight
8%31221235%7%61%
1722
May1st to 15thNight
9%31231335%5%60%
1619
16th to endNight
5%21232345%9%59%
1683
June1st to 15thNight
421322346%10%58%
1620
16th to endNight
321332336%9%59%
1620
July1st to 15thNight
33223245%6%10%55%
1620
16th to endNight
3221436%9%63%
1702
August1st to 15thNight
2123325%6%9%60%
1641
16th to endNight
221442447%10%55%
1750
September1st to 15thNight
11%4234245%47%48%
1785
16th to endNight
5%31443445%6%57%
1815
October1st to 15thNight
8%42231234462%
1815
16th to endNight
321231123473%
2104
November1st to 15thNight
422212336%68%
2275
16th to endNight
6%312213335%66%
2340
December1st to 15thNight
9%312222335%63%
2340
16th to endNight
10%424323335%57%
2496

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
7%423322235%62%
1611
16th to endDay
7%313323345%61%
1795
February1st to 15thDay
7%5%2331223462%
1750
16th to endDay
8%6%23213235%60%
1580
March1st to 15thDay
10%423423446%54%
1878
16th to endDay
8%424223335%59%
2110
April1st to 15thDay
9%313223346%59%
2084
16th to endDay
10%312312335%60%
2238
May1st to 15thDay
12%313323435%55%
2331
16th to endDay
7%4233245%47%53%
2430
June1st to 15thDay
5%22343435%7%58%
2340
16th to endDay
5%21332436%7%58%
2340
July1st to 15thDay
7%213425%5%5%9%52%
2340
16th to endDay
311232445%8%61%
2466
August1st to 15thDay
31134245%5%8%59%
2230
16th to endDay
5%2135%25%5%5%6%56%
2100
September1st to 15thDay
12%31442445%7%48%
1845
16th to endDay
7%313423445%58%
1815
October1st to 15thDay
10%3231344460%
1815
16th to endDay
5%21221223470%
1753
November1st to 15thDay
5%211212236%67%
1583
16th to endDay
7%3122223467%
1620
December1st to 15thDay
8%5%24322335%57%
1620
16th to endDay
11%413313345%56%
1728
January1st to 15thNight
6%413313335%63%
2327
16th to endNight
6%312312335%65%
2439
February1st to 15thNight
8%423212235%61%
2102
16th to endNight
8%313221346%62%
1894
March1st to 15thNight
9%41432335%5%56%
2082
16th to endNight
8%322322346%60%
2112
April1st to 15thNight
7%313323346%59%
1861
16th to endNight
8%312212447%61%
1722
May1st to 15thNight
9%312313345%60%
1619
16th to endNight
5%21222335%9%59%
1683
June1st to 15thNight
431232346%10%57%
1620
16th to endNight
311332446%9%59%
1620
July1st to 15thNight
33233236%6%9%55%
1620
16th to endNight
31222436%9%64%
1702
August1st to 15thNight
1123235%6%10%59%
1641
16th to endNight
231432445%11%55%
1750
September1st to 15thNight
12%4134335%48%48%
1785
16th to endNight
5%314434445%57%
1815
October1st to 15thNight
9%313312335%62%
1815
16th to endNight
321231223473%
2104
November1st to 15thNight
4212213336%68%
2275
16th to endNight
6%312213235%66%
2340
December1st to 15thNight
9%312212335%64%
2340
16th to endNight
9%424323335%56%
2496

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
25%27%25%27%11%
1612
16th to endDay
25%36%20%33%10%
1795
February1st to 15thDay
26%36%20%29%12%
1751
16th to endDay
28%2422%27%14%
1580
March1st to 15thDay
30%47%19%25%12%
1878
16th to endDay
28%38%24%22%12%
2112
April1st to 15thDay
26%49%18%24%16%
2084
16th to endDay
27%49%19%28%11%
2238
May1st to 15thDay
31%49%18%22%12%
2331
16th to endDay
29%8%10%19%24%8%
2434
June1st to 15thDay
25%5%11%23%23%9%
2340
16th to endDay
24%5%12%23%24%9%
2340
July1st to 15thDay
27%7%11%24%23%5%
2201
16th to endDay
17%6%12%30%27%4
2311
August1st to 15thDay
19%6%14%24%25%10%
2216
16th to endDay
25%7%13%24%22%6%
2100
September1st to 15thDay
35%6%10%19%19%8%
1845
16th to endDay
26%47%21%27%11%
1815
October1st to 15thDay
26%5%9%23%24%11%
1815
16th to endDay
18%36%20%32%18%
1753
November1st to 15thDay
18%37%22%31%15%
1583
16th to endDay
21%2418%33%18%
1620
December1st to 15thDay
29%28%23%27%8%
1620
16th to endDay
30%18%23%26%8%
1728
January1st to 15thNight
24%27%19%30%15%
2327
16th to endNight
22%26%17%33%16%
2439
February1st to 15thNight
27%27%19%26%16%
2112
16th to endNight
24%36%20%26%18%
1894
March1st to 15thNight
29%37%17%24%17%
2082
16th to endNight
25%49%25%22%11%
2112
April1st to 15thNight
25%49%18%24%17%
1861
16th to endNight
22%5%10%21%24%15%
1722
May1st to 15thNight
25%5%10%18%22%17%
1620
16th to endNight
21%7%13%23%22%11%
1685
June1st to 15thNight
20%5%15%27%23%8%
1620
16th to endNight
20%412%25%25%11%
1620
July1st to 15thNight
21%7%12%26%23%8%
1530
16th to endNight
14%5%12%29%30%7%
1594
August1st to 15thNight
16%5%12%23%28%13%
1631
16th to endNight
21%6%12%26%22%10%
1750
September1st to 15thNight
34%5%12%17%19%11%
1785
16th to endNight
27%5%8%18%25%14%
1815
October1st to 15thNight
24%39%20%25%15%
1815
16th to endNight
16%25%18%34%21%
2104
November1st to 15thNight
17%38%20%29%20%
2275
16th to endNight
21%3418%31%20%
2340
December1st to 15thNight
23%27%23%29%12%
2340
16th to endNight
30%28%18%28%11%
2496

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
18%436%27%8%3
90
16th to endDay
311%42%32%10%
96
February1st to 15thDay
5%10%36%34%12%1
90
16th to endDay
11%237%39%9%
81
March1st to 15thDay
11%7%43%33%4
90
16th to endDay
9%8%30%33%14%4
96
April1st to 15thDay
12%12%45%21%7%
203
16th to endDay
10%12%39%26%7%2
348
May1st to 15thDay
11%7%36%32%10%1
468
16th to endDay
10%7%28%34%16%3
517
June1st to 15thDay
6%121%43%22%3
495
16th to endDay
4115%40%30%7%
495
July1st to 15thDay
6%9%40%35%6%
475
16th to endDay
3229%48%15%
515
August1st to 15thDay
6%229%49%11%
415
16th to endDay
411%38%35%10%
268
September1st to 15thDay
7%6%40%33%11%
120
16th to endDay
5%1334%33%22%
90
October1st to 15thDay
4320%33%37%1
90
16th to endDay
6%222%40%27%1
96
November1st to 15thDay
20%321%28%22%4
90
16th to endDay
20%13%33%23%6%3
90
December1st to 15thDay
6%5%40%32%14%1
90
16th to endDay
15%11%39%25%8%
96
January1st to 15thNight
9%6%32%39%11%
900
16th to endNight
7%5%37%39%9%
903
February1st to 15thNight
10%9%34%35%9%
704
16th to endNight
10%8%44%31%4
632
March1st to 15thNight
10%9%41%31%6%
642
16th to endNight
8%11%42%32%4
576
April1st to 15thNight
9%10%47%28%3
539
16th to endNight
9%9%46%29%5%
540
May1st to 15thNight
9%6%43%30%8%
540
16th to endNight
6%435%38%14%
563
June1st to 15thNight
5%231%45%13%
540
16th to endNight
326%46%22%
540
July1st to 15thNight
3110%49%33%1
510
16th to endNight
3446%42%2
564
August1st to 15thNight
2245%48%1
527
16th to endNight
38%44%40%3
525
September1st to 15thNight
12%113%39%30%2
495
16th to endNight
6%116%44%28%1
492
October1st to 15thNight
10%229%38%18%1
495
16th to endNight
45%31%39%18%
696
November1st to 15thNight
6%5%33%36%16%
875
16th to endNight
8%5%33%38%12%1
900
December1st to 15thNight
11%6%29%41%10%
900
16th to endNight
11%6%34%38%8%
960
Page generated at 2017-08-13 13:16:48. Version ac04

Copyright 2017 A. Danko


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