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 2018-02-22.

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%
16356
31%
48905
20%
16311
62%
16311
44%
25373

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
49%
974
33%
2522
15%
970
59%
970
48%
1385
January16th to endNight
45%
978
39%
2642
18%
978
59%
978
51%
1370
February1st to 15thNight
42%
764
30%
2292
15%
760
54%
760
41%
1202
February16th to endNight
32%
660
33%
1978
11%
660
50%
660
40%
1046
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
12%
539
50%
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
56%
540
23%
1620
17%
540
66%
540
48%
815
June16th to endNight
63%
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%
539
33%
1670
40%
536
87%
536
52%
801
August16th to endNight
79%
573
29%
1910
33%
573
81%
573
44%
947
September1st to 15thNight
66%
540
23%
1947
25%
540
70%
540
32%
1067
September16th to endNight
64%
537
33%
1980
30%
537
72%
537
35%
1034
October1st to 15thNight
55%
540
34%
1980
30%
540
64%
540
39%
961
October16th to endNight
56%
759
40%
2295
23%
759
68%
759
55%
1057
November1st to 15thNight
50%
950
32%
2470
13%
950
60%
950
54%
1280
November16th to endNight
49%
975
39%
2535
18%
975
60%
975
52%
1342
December1st to 15thNight
49%
975
36%
2535
19%
975
59%
975
48%
1373
December16th to endNight
42%
1040
33%
2704
15%
1040
54%
1040
40%
1586

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%
49346
Night
6%313323346%61%
49101
Cloud CoverDay
7%313323346%59%
49344
Night
6%313323346%61%
49101
TransparencyDay
26%49%22%26%11%
49044
Night
23%49%21%26%14%
48906
SeeingDay
8%422%33%24%5%
6109
Night
8%5%30%38%16%
16359

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
6%413322235%62%
1746
16th to endDay
6%312223335%64%
1945
February1st to 15thDay
6%5%23322235%62%
1900
16th to endDay
9%5%23323335%58%
1642
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
41342445%8%59%
2277
16th to endDay
5%21342445%7%56%
2292
September1st to 15thDay
11%213424446%51%
2013
16th to endDay
9%322423446%56%
1980
October1st to 15thDay
9%21232333461%
1980
16th to endDay
421222233471%
1912
November1st to 15thDay
6%212312337%65%
1718
16th to endDay
7%212212235%68%
1755
December1st to 15thDay
8%5%14322345%58%
1755
16th to endDay
11%6%14313245%54%
1872
January1st to 15thNight
6%33313345%63%
2522
16th to endNight
5%312213335%67%
2642
February1st to 15thNight
7%423222335%61%
2282
16th to endNight
9%313222246%59%
1978
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
2123335%6%9%59%
1680
16th to endNight
221432447%10%56%
1910
September1st to 15thNight
10%3234245%48%50%
1947
16th to endNight
7%31443345%6%55%
1980
October1st to 15thNight
8%42331234462%
1980
16th to endNight
321231223473%
2295
November1st to 15thNight
5%22212336%67%
2470
16th to endNight
6%312212335%67%
2535
December1st to 15thNight
9%212222335%64%
2535
16th to endNight
9%5%24323336%56%
2704

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%
1746
16th to endDay
6%312323335%64%
1945
February1st to 15thDay
6%5%23312235%62%
1900
16th to endDay
9%6%23323235%58%
1642
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%58%
2277
16th to endDay
5%212435%5%5%6%57%
2292
September1st to 15thDay
11%314424446%51%
2013
16th to endDay
8%31342345%5%56%
1980
October1st to 15thDay
9%3231333461%
1980
16th to endDay
421221232471%
1912
November1st to 15thDay
6%212213346%65%
1718
16th to endDay
7%3122224468%
1755
December1st to 15thDay
8%5%24322335%58%
1755
16th to endDay
12%424313345%54%
1872
January1st to 15thNight
6%412313336%63%
2522
16th to endNight
5%21231233467%
2642
February1st to 15thNight
7%413212245%62%
2282
16th to endNight
9%323222346%60%
1978
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
2133235%6%10%59%
1680
16th to endNight
231432345%11%56%
1910
September1st to 15thNight
11%3133335%48%50%
1947
16th to endNight
7%314434446%56%
1980
October1st to 15thNight
8%323312335%62%
1980
16th to endNight
311231222473%
2295
November1st to 15thNight
5%312213336%67%
2470
16th to endNight
6%212213235%67%
2535
December1st to 15thNight
8%312212335%64%
2535
16th to endNight
9%5%24323336%56%
2704

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%37%26%27%10%
1747
16th to endDay
23%36%20%34%12%
1945
February1st to 15thDay
25%38%22%28%11%
1901
16th to endDay
29%35%21%26%13%
1642
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
20%6%14%23%24%10%
2263
16th to endDay
25%6%13%24%21%7%
2292
September1st to 15thDay
32%5%10%21%22%8%
2013
16th to endDay
28%47%21%26%10%
1980
October1st to 15thDay
25%5%9%23%23%12%
1980
16th to endDay
17%36%19%33%19%
1912
November1st to 15thDay
20%37%22%30%15%
1718
16th to endDay
20%2420%33%17%
1755
December1st to 15thDay
29%28%23%26%9%
1755
16th to endDay
32%28%23%25%8%
1872
January1st to 15thNight
23%27%20%31%14%
2522
16th to endNight
21%26%17%34%17%
2642
February1st to 15thNight
26%28%20%26%14%
2292
16th to endNight
26%36%19%25%17%
1978
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
17%5%12%23%27%13%
1670
16th to endNight
21%5%13%26%22%10%
1910
September1st to 15thNight
31%412%18%21%10%
1947
16th to endNight
28%5%8%18%25%13%
1980
October1st to 15thNight
24%48%21%24%16%
1980
16th to endNight
16%25%17%34%22%
2295
November1st to 15thNight
18%38%21%28%19%
2470
16th to endNight
20%2419%33%19%
2535
December1st to 15thNight
23%27%23%28%14%
2535
16th to endNight
30%28%18%27%12%
2704

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
15%431%34%12%2
135
16th to endDay
210%40%32%14%
144
February1st to 15thDay
5%7%37%34%14%
135
16th to endDay
13%7%40%32%8%
100
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%50%10%
430
16th to endDay
49%36%37%11%
332
September1st to 15thDay
5%5%33%33%20%
168
16th to endDay
13%25%35%28%14%
135
October1st to 15thDay
5%223%34%32%2
135
16th to endDay
4227%37%25%2
144
November1st to 15thDay
21%227%26%17%5%
135
16th to endDay
14%11%34%22%11%5%
135
December1st to 15thDay
6%438%36%13%
135
16th to endDay
18%13%31%29%7%
144
January1st to 15thNight
9%6%31%40%11%
975
16th to endNight
6%5%37%39%9%
978
February1st to 15thNight
9%8%35%35%10%
764
16th to endNight
11%9%43%30%4
660
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%46%1
539
16th to endNight
38%42%41%3
573
September1st to 15thNight
11%113%40%32%2
540
16th to endNight
8%119%43%26%1
537
October1st to 15thNight
9%228%38%19%1
540
16th to endNight
45%31%39%18%
759
November1st to 15thNight
7%5%34%36%16%
950
16th to endNight
8%6%33%38%13%1
975
December1st to 15thNight
10%6%30%41%11%
975
16th to endNight
12%6%34%38%8%
1040
Page generated at 2018-02-23 10:21:30. Version ac04

Copyright 2018 A. Danko


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