Cedar Breaks National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cedar Breaks National Monument clear sky chart from 2005-11-06 to 2024-01-15.

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%
24054
30%
74362
19%
24006
60%
24006
38%
38369

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
42%
757
28%
2457
18%
756
56%
756
32%
1302
January11th to 20thNight
43%
736
31%
2392
20%
736
57%
736
38%
1184
January21st to endNight
37%
792
32%
2574
19%
792
56%
792
29%
1415
February1st to 10thNight
34%
720
26%
2313
15%
720
50%
720
30%
1237
February11th to 20thNight
35%
700
29%
2099
18%
700
51%
700
32%
1154
February21st to endNight
31%
592
28%
1776
15%
592
47%
592
27%
1042
March1st to 10thNight
35%
720
25%
2057
13%
720
48%
720
30%
1209
March11th to 20thNight
42%
720
27%
1980
18%
720
51%
720
32%
1171
March21st to endNight
33%
792
25%
2178
9%
792
46%
792
32%
1247
April1st to 10thNight
35%
720
26%
1980
11%
720
47%
720
33%
1100
April11th to 20thNight
31%
603
30%
1689
10%
603
46%
603
34%
899
April21st to endNight
36%
540
33%
1620
13%
540
54%
540
35%
819
May1st to 10thNight
34%
540
31%
1620
14%
540
49%
540
36%
854
May11th to 20thNight
51%
531
32%
1595
19%
531
59%
531
45%
762
May21st to endNight
44%
582
26%
1746
15%
582
54%
582
38%
883
June1st to 10thNight
58%
540
31%
1620
22%
540
67%
540
52%
741
June11th to 20thNight
52%
540
31%
1620
21%
540
63%
540
54%
717
June21st to endNight
61%
540
30%
1620
23%
540
68%
540
57%
737
July1st to 10thNight
71%
525
28%
1575
22%
525
76%
525
52%
756
July11th to 20thNight
70%
522
23%
1566
19%
522
72%
522
41%
846
July21st to endNight
71%
591
20%
1674
18%
558
71%
558
34%
981
August1st to 10thNight
68%
537
28%
1602
20%
534
72%
534
44%
829
August11th to 20thNight
76%
534
34%
1602
24%
534
80%
534
47%
802
August21st to endNight
72%
682
35%
1878
25%
682
76%
682
52%
959
September1st to 10thNight
71%
720
32%
1980
24%
720
76%
720
50%
1048
September11th to 20thNight
66%
720
39%
1980
26%
720
76%
720
56%
955
September21st to endNight
65%
720
40%
1980
28%
720
73%
720
58%
939
October1st to 10thNight
51%
720
34%
1998
19%
720
64%
720
45%
1063
October11th to 20thNight
58%
720
39%
2160
26%
720
72%
720
54%
978
October21st to endNight
51%
792
40%
2376
24%
792
67%
792
46%
1113
November1st to 10thNight
50%
740
33%
2388
22%
740
65%
740
43%
1120
November11th to 20thNight
49%
760
36%
2470
26%
760
63%
760
44%
1133
November21st to endNight
46%
760
33%
2470
24%
760
60%
760
36%
1236
December1st to 10thNight
44%
760
29%
2470
19%
760
57%
760
34%
1287
December11th to 20thNight
40%
760
30%
2898
18%
758
54%
758
26%
1565
December21st to endNight
29%
826
16%
4359
13%
817
44%
817
16%
2286

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
36%36%5%3445%7%53%
74941
Night
25%35%5%3445%7%57%
74872
TransparencyDay
30%37%20%25%14%
74668
Night
25%38%22%26%16%
74667
SeeingDay
10%21%29%24%12%3
13821
Night
6%16%24%28%21%5%
24073

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 10thDay
26%5%8%5%3345%8%51%
1708
11th to 20thDay
17%45%5%25%5%6%8%51%
1656
21st to endDay
38%5%7%5%3447%6%49%
1782
February1st to 10thDay
18%36%6%35%47%7%50%
1642
11th to 20thDay
29%47%7%2335%8%49%
1750
21st to endDay
29%5%8%5%34447%49%
1480
March1st to 10thDay
29%47%6%25%45%6%47%
1901
11th to 20thDay
210%5%8%6%35%5%5%7%46%
1980
21st to endDay
310%5%9%6%36%45%6%43%
2178
April1st to 10thDay
28%47%5%346%6%6%49%
1980
11th to 20thDay
28%36%5%35%47%7%51%
2212
21st to endDay
48%35%42445%7%54%
2340
May1st to 10thDay
5%8%345%35%5%6%7%50%
2340
11th to 20thDay
38%345%35%5%5%8%51%
2301
21st to endDay
48%35%5%35%5%5%7%50%
2530
June1st to 10thDay
231343445%7%64%
2340
11th to 20thDay
331342334470%
2340
21st to endDay
3314423436%66%
2340
July1st to 10thDay
4425%5%35%5%5%5%56%
2340
11th to 20thDay
5%6%36%7%5%6%6%6%7%43%
2340
21st to endDay
8%7%37%8%5%8%6%7%7%34%
2545
August1st to 10thDay
6%435%7%35%5%7%6%50%
2328
11th to 20thDay
45%25%7%35%5%5%6%52%
2299
21st to endDay
5%435%6%345%5%6%52%
2474
September1st to 10thDay
7%6%26%5%45%445%53%
1980
11th to 20thDay
5%424423345%63%
1980
21st to endDay
4424423445%65%
1980
October1st to 10thDay
6%7%25%424445%56%
1962
11th to 20thDay
35%2332334469%
1800
21st to endDay
2424423335%68%
1980
November1st to 10thDay
16%45%323347%62%
1688
11th to 20thDay
2425%32345%7%63%
1710
21st to endDay
26%46%43235%7%56%
1710
December1st to 10thDay
17%47%6%24446%56%
1710
11th to 20thDay
212%5%7%6%3446%9%43%
2169
21st to endDay
17%48%7%47%6%7%9%40%
3146
January1st to 10thNight
27%35%5%445%5%7%52%
2457
11th to 20thNight
15%35%5%345%6%8%55%
2392
21st to endNight
37%47%6%35%5%5%9%48%
2574
February1st to 10thNight
16%46%6%35%5%6%7%51%
2313
11th to 20thNight
28%5%7%5%25%447%51%
2098
21st to endNight
16%5%10%7%45%5%5%7%45%
1776
March1st to 10thNight
18%47%5%35%5%6%8%46%
2057
11th to 20thNight
25%5%8%7%45%6%7%8%46%
1980
21st to endNight
17%46%5%45%5%6%8%48%
2178
April1st to 10thNight
25%26%435%46%9%53%
1980
11th to 20thNight
2426%435%46%8%55%
1689
21st to endNight
36%244245%6%9%56%
1620
May1st to 10thNight
45%35%5%2446%7%56%
1620
11th to 20thNight
332342437%7%63%
1594
21st to endNight
3425%5%3445%8%59%
1746
June1st to 10thNight
22133245%5%7%66%
1620
11th to 20thNight
2312223346%72%
1620
21st to endNight
2214324445%70%
1620
July1st to 10thNight
3223425%46%7%64%
1620
11th to 20thNight
3425%5%45%6%5%8%53%
1620
21st to endNight
45%25%7%45%8%8%10%41%
1773
August1st to 10thNight
44145%34446%61%
1611
11th to 20thNight
33133246%6%8%59%
1602
21st to endNight
33133235%5%8%63%
1878
September1st to 10thNight
431442346%6%62%
1980
11th to 20thNight
4313222335%72%
1980
21st to endNight
3212322235%74%
1980
October1st to 10thNight
5%424323435%65%
1998
11th to 20thNight
2413323335%73%
2160
21st to endNight
2414323447%65%
2376
November1st to 10thNight
15%35%32335%8%62%
2388
11th to 20thNight
1325%42345%7%63%
2470
21st to endNight
15%37%5%3435%7%57%
2470
December1st to 10thNight
36%36%5%345%5%8%53%
2470
11th to 20thNight
28%46%5%3446%12%44%
3041
21st to endNight
16%410%7%45%5%5%8%43%
4521

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
30%312%28%22%5%
1709
11th to 20thDay
28%311%26%21%11%
1656
21st to endDay
33%38%24%22%9%
1782
February1st to 10thDay
30%413%22%22%10%
1642
11th to 20thDay
33%27%22%23%12%
1760
21st to endDay
35%38%22%25%8%
1480
March1st to 10thDay
35%37%24%25%6%
1901
11th to 20thDay
37%36%30%18%6%
1980
21st to endDay
40%39%25%19%4
2178
April1st to 10thDay
32%48%25%22%9%
1980
11th to 20thDay
30%27%26%27%8%
2215
21st to endDay
29%37%29%26%5%
2340
May1st to 10thDay
32%36%21%32%5%
2340
11th to 20thDay
30%46%25%28%7%
2304
21st to endDay
32%46%20%32%6%
2530
June1st to 10thDay
21%2420%37%16%
2340
11th to 20thDay
19%3313%31%32%
2340
21st to endDay
19%4211%26%38%
2340
July1st to 10thDay
28%5%49%21%32%
2276
11th to 20thDay
37%5%8%16%18%16%
2271
21st to endDay
44%6%12%16%11%11%
2404
August1st to 10thDay
33%47%15%18%23%
2313
11th to 20thDay
31%38%13%22%24%
2299
21st to endDay
32%5%5%19%26%14%
2474
September1st to 10thDay
33%46%10%23%24%
1980
11th to 20thDay
24%2418%28%24%
1980
21st to endDay
23%3216%37%19%
1980
October1st to 10thDay
29%3420%27%17%
1962
11th to 20thDay
20%2319%38%19%
1800
21st to endDay
19%25%26%35%13%
1980
November1st to 10thDay
23%27%27%28%13%
1688
11th to 20thDay
20%38%27%29%14%
1710
21st to endDay
27%36%21%29%13%
1710
December1st to 10thDay
29%312%21%23%12%
1710
11th to 20thDay
38%38%22%21%8%
2168
21st to endDay
36%38%20%21%12%
3146
January1st to 10thNight
29%310%26%24%8%
2457
11th to 20thNight
25%213%24%23%13%
2392
21st to endNight
32%38%23%24%10%
2574
February1st to 10thNight
29%411%23%21%13%
2313
11th to 20thNight
31%26%18%24%18%
2099
21st to endNight
35%37%20%27%8%
1776
March1st to 10thNight
33%47%24%23%9%
2057
11th to 20thNight
33%37%29%20%9%
1980
21st to endNight
29%411%28%22%5%
2178
April1st to 10thNight
25%48%28%23%11%
1980
11th to 20thNight
24%311%26%28%8%
1689
21st to endNight
24%27%34%28%5%
1620
May1st to 10thNight
25%47%25%32%7%
1620
11th to 20thNight
19%38%32%30%8%
1595
21st to endNight
23%38%25%36%6%
1746
June1st to 10thNight
17%25%19%43%14%
1620
11th to 20thNight
14%35%13%32%33%
1620
21st to endNight
16%2110%27%43%
1620
July1st to 10thNight
19%46%10%24%38%
1575
11th to 20thNight
27%5%9%21%18%21%
1566
21st to endNight
33%6%19%22%10%12%
1674
August1st to 10thNight
25%410%17%20%24%
1602
11th to 20thNight
22%48%15%25%26%
1602
21st to endNight
19%5%7%19%32%18%
1878
September1st to 10thNight
22%47%16%26%27%
1980
11th to 20thNight
17%26%19%28%28%
1980
21st to endNight
14%3420%36%23%
1980
October1st to 10thNight
23%3422%27%21%
1998
11th to 20thNight
15%26%16%39%22%
2160
21st to endNight
18%26%24%37%14%
2376
November1st to 10thNight
22%29%26%28%14%
2388
11th to 20thNight
20%29%22%32%16%
2470
21st to endNight
25%26%20%29%18%
2470
December1st to 10thNight
28%310%23%22%13%
2470
11th to 20thNight
32%310%22%23%10%
3041
21st to endNight
37%39%16%19%17%
4521

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
17%29%27%17%7%3
270
11th to 20thDay
14%28%25%22%8%3
252
21st to endDay
10%27%29%21%11%2
264
February1st to 10thDay
11%32%28%17%9%2
262
11th to 20thDay
14%31%32%17%5%1
415
21st to endDay
13%38%30%15%21
346
March1st to 10thDay
18%28%31%13%9%1
420
11th to 20thDay
11%27%34%19%8%1
420
21st to endDay
17%37%31%12%3
462
April1st to 10thDay
9%32%35%14%9%2
420
11th to 20thDay
18%33%30%14%31
412
21st to endDay
14%29%29%17%8%2
420
May1st to 10thDay
15%28%36%13%6%1
423
11th to 20thDay
13%20%33%23%8%3
448
21st to endDay
14%22%27%24%9%3
485
June1st to 10thDay
6%16%35%30%11%2
450
11th to 20thDay
7%18%36%26%12%2
450
21st to endDay
6%12%37%32%12%2
450
July1st to 10thDay
47%31%35%19%4
446
11th to 20thDay
6%6%26%36%19%7%
444
21st to endDay
9%417%40%24%6%
487
August1st to 10thDay
6%6%30%36%16%6%
447
11th to 20thDay
8%6%27%34%18%7%
437
21st to endDay
6%6%30%33%19%6%
495
September1st to 10thDay
6%11%25%28%22%8%
450
11th to 20thDay
418%30%29%15%4
450
21st to endDay
9%15%24%31%17%5%
450
October1st to 10thDay
9%25%25%19%16%5%
432
11th to 20thDay
10%18%21%29%17%6%
270
21st to endDay
11%21%30%22%15%1
297
November1st to 10thDay
10%23%25%25%14%3
270
11th to 20thDay
324%29%25%14%4
270
21st to endDay
10%25%23%21%19%3
270
December1st to 10thDay
8%22%33%21%14%2
270
11th to 20thDay
9%27%27%23%10%4
270
21st to endDay
15%29%31%17%7%1
297
January1st to 10thNight
8%19%25%25%16%7%
760
11th to 20thNight
6%18%28%26%16%6%
736
21st to endNight
7%21%29%23%16%5%
792
February1st to 10thNight
5%23%30%24%14%4
720
11th to 20thNight
7%22%31%25%12%3
704
21st to endNight
10%22%31%23%11%3
592
March1st to 10thNight
7%23%31%25%12%2
720
11th to 20thNight
6%19%24%28%19%3
720
21st to endNight
7%24%30%25%11%3
792
April1st to 10thNight
7%27%26%22%16%2
720
11th to 20thNight
7%27%31%19%13%4
603
21st to endNight
8%27%25%23%13%4
540
May1st to 10thNight
9%16%34%27%12%2
540
11th to 20thNight
5%16%25%27%22%5%
531
21st to endNight
7%17%26%28%18%4
584
June1st to 10thNight
212%23%40%20%3
540
11th to 20thNight
213%28%33%19%4
540
21st to endNight
3427%37%25%4
540
July1st to 10thNight
2216%34%38%8%
525
11th to 20thNight
4212%38%35%10%
522
21st to endNight
416%33%46%9%
591
August1st to 10thNight
4116%37%34%7%
537
11th to 20thNight
4210%37%41%6%
534
21st to endNight
4412%33%36%11%
682
September1st to 10thNight
5%6%11%32%35%11%
720
11th to 20thNight
5%8%16%32%29%10%
720
21st to endNight
5%9%17%27%31%11%
720
October1st to 10thNight
7%13%24%28%24%4
720
11th to 20thNight
6%13%21%32%21%9%
720
21st to endNight
6%18%21%26%22%8%
792
November1st to 10thNight
6%15%23%28%21%7%
740
11th to 20thNight
5%15%27%27%19%7%
760
21st to endNight
6%19%23%25%22%5%
760
December1st to 10thNight
8%16%27%26%19%4
760
11th to 20thNight
7%19%28%27%17%2
760
21st to endNight
8%26%29%23%12%2
836
Page generated at 2024-01-11 20:33:51. Version ac07

Copyright 2024 Attilla Danko


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