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 2005-11-05 to 2018-01-12.

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%
16096
29%
48366
20%
16058
61%
16058
38%
25521

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
45%
761
27%
2471
19%
760
55%
760
35%
1304
January16th to endNight
45%
768
29%
2496
22%
768
57%
768
32%
1367
February1st to 15thNight
41%
700
25%
2214
19%
700
53%
700
32%
1221
February16th to endNight
35%
632
28%
1895
18%
632
48%
632
29%
1116
March1st to 15thNight
42%
720
28%
2031
16%
720
55%
720
34%
1148
March16th to endNight
41%
768
26%
2112
14%
768
52%
768
35%
1202
April1st to 15thNight
35%
705
23%
1917
10%
705
44%
705
30%
1106
April16th to endNight
39%
540
32%
1620
15%
540
54%
540
33%
830
May1st to 15thNight
40%
540
29%
1619
15%
539
51%
539
39%
848
May16th to endNight
45%
561
26%
1685
16%
561
53%
561
37%
866
June1st to 15thNight
55%
540
28%
1620
21%
540
62%
540
52%
735
June16th to endNight
61%
540
31%
1620
24%
540
68%
540
62%
698
July1st to 15thNight
71%
510
22%
1530
18%
510
74%
510
42%
813
July16th to endNight
69%
564
20%
1593
19%
531
69%
531
34%
939
August1st to 15thNight
71%
539
28%
1611
20%
536
74%
536
43%
835
August16th to endNight
76%
632
36%
1784
26%
632
79%
632
48%
927
September1st to 15thNight
69%
720
30%
1980
22%
720
75%
720
48%
1071
September16th to endNight
67%
716
42%
1980
28%
716
76%
716
58%
922
October1st to 15thNight
53%
720
34%
2052
21%
720
64%
720
47%
1043
October16th to endNight
57%
768
38%
2304
27%
768
69%
768
45%
1136
November1st to 15thNight
51%
760
30%
2458
24%
760
62%
760
39%
1222
November16th to endNight
51%
780
34%
2535
28%
780
62%
780
39%
1247
December1st to 15thNight
47%
780
26%
2535
18%
780
58%
780
35%
1323
December16th to endNight
38%
832
24%
2704
15%
832
50%
832
25%
1602

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
47%35%42445%6%52%
48968
Night
25%25%42445%7%55%
48561
TransparencyDay
31%37%21%23%12%
48663
Night
25%39%22%25%12%
48367
SeeingDay
10%21%30%24%10%2
5808
Night
5%14%21%26%23%7%
16105

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
28%46%42335%7%51%
1710
16th to endDay
38%36%42436%6%48%
1728
February1st to 15thDay
19%35%5%2447%6%48%
1646
16th to endDay
211%6%6%5%23247%46%
1579
March1st to 15thDay
18%45%5%1435%6%51%
1927
16th to endDay
39%5%7%435%447%45%
2112
April1st to 15thDay
39%46%41446%5%47%
2026
16th to endDay
48%36%31445%7%51%
2340
May1st to 15thDay
48%34425%5%6%7%47%
2331
16th to endDay
48%35%324447%50%
2429
June1st to 15thDay
341342333464%
2340
16th to endDay
221331222473%
2340
July1st to 15thDay
5%5%25%7%45%5%5%5%46%
2340
16th to endDay
9%7%36%6%46%6%6%7%36%
2467
August1st to 15thDay
6%426%7%35%46%6%46%
2340
16th to endDay
5%425%6%345%45%51%
2415
September1st to 15thDay
8%6%26%43444449%
1980
16th to endDay
3424422345%63%
1980
October1st to 15thDay
5%6%2431334459%
1908
16th to endDay
342442233364%
1920
November1st to 15thDay
26%35%222446%58%
1728
16th to endDay
25%35%322347%57%
1755
December1st to 15thDay
18%46%42335%6%53%
1755
16th to endDay
310%47%5%25%45%8%41%
1872
January1st to 15thNight
27%35%5%33346%55%
2471
16th to endNight
38%35%5%2445%7%49%
2496
February1st to 15thNight
17%46%4245%5%7%50%
2203
16th to endNight
18%5%8%5%35%35%7%44%
1895
March1st to 15thNight
17%45%43446%8%48%
2031
16th to endNight
15%36%5%345%5%9%49%
2112
April1st to 15thNight
36%27%33435%7%51%
1917
16th to endNight
25%25%32346%8%54%
1620
May1st to 15thNight
35%25%31346%7%56%
1619
16th to endNight
3324424347%59%
1684
June1st to 15thNight
221222345%6%67%
1620
16th to endNight
112212235%75%
1620
July1st to 15thNight
3324425%5%6%7%54%
1620
16th to endNight
4425%6%46%7%7%8%41%
1701
August1st to 15thNight
431343445%8%56%
1620
16th to endNight
32132246%5%8%58%
1784
September1st to 15thNight
5%31332346%5%59%
1980
16th to endNight
3212211225%74%
1980
October1st to 15thNight
4313313335%65%
2052
16th to endNight
2414323445%63%
2304
November1st to 15thNight
15%25%42335%6%58%
2458
16th to endNight
1426%433348%58%
2535
December1st to 15thNight
26%25%4235%5%7%53%
2535
16th to endNight
29%47%425%5%6%9%41%
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
30%213%27%21%3
1711
16th to endDay
33%49%23%19%10%
1728
February1st to 15thDay
31%313%24%17%8%
1646
16th to endDay
37%27%22%25%4
1579
March1st to 15thDay
30%29%32%19%5%
1927
16th to endDay
36%310%28%17%4
2112
April1st to 15thDay
35%29%24%22%5%
2026
16th to endDay
31%37%27%24%5%
2340
May1st to 15thDay
32%37%22%28%4
2331
16th to endDay
32%36%20%30%6%
2432
June1st to 15thDay
23%2313%35%21%
2340
16th to endDay
16%229%29%40%
2340
July1st to 15thDay
37%4412%13%27%
2201
16th to endDay
42%5%10%15%14%11%
2312
August1st to 15thDay
35%46%16%18%19%
2325
16th to endDay
32%36%19%23%14%
2415
September1st to 15thDay
37%36%10%20%20%
1980
16th to endDay
24%2318%33%18%
1980
October1st to 15thDay
26%2323%31%12%
1908
16th to endDay
24%25%25%31%11%
1920
November1st to 15thDay
24%29%25%27%9%
1728
16th to endDay
25%27%28%26%9%
1755
December1st to 15thDay
30%413%24%21%6%
1755
16th to endDay
38%5%14%18%17%5%
1872
January1st to 15thNight
29%212%24%24%7%
2471
16th to endNight
31%311%20%21%11%
2496
February1st to 15thNight
30%312%24%18%11%
2214
16th to endNight
35%26%21%27%5%
1895
March1st to 15thNight
29%39%28%21%7%
2031
16th to endNight
28%311%30%19%5%
2112
April1st to 15thNight
28%310%25%23%7%
1917
16th to endNight
24%29%34%24%5%
1620
May1st to 15thNight
24%38%29%27%6%
1620
16th to endNight
24%37%27%33%4
1685
June1st to 15thNight
16%2416%38%21%
1620
16th to endNight
13%118%31%43%
1620
July1st to 15thNight
26%38%14%17%29%
1530
16th to endNight
32%6%12%21%12%15%
1593
August1st to 15thNight
24%39%17%22%21%
1611
16th to endNight
20%5%8%20%29%15%
1784
September1st to 15thNight
23%37%16%25%23%
1980
16th to endNight
13%25%23%32%21%
1980
October1st to 15thNight
21%26%21%32%16%
2052
16th to endNight
20%26%21%37%11%
2304
November1st to 15thNight
24%210%23%27%11%
2458
16th to endNight
24%27%24%30%10%
2535
December1st to 15thNight
27%312%25%21%9%
2535
16th to endNight
36%414%21%17%5%
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
21%23%24%21%7%2
123
16th to endDay
9%20%32%18%17%1
96
February1st to 15thDay
8%28%25%22%10%3
161
16th to endDay
12%44%25%11%41
238
March1st to 15thDay
11%27%33%16%9%1
270
16th to endDay
11%32%34%18%3
288
April1st to 15thDay
12%38%29%10%5%2
269
16th to endDay
19%34%25%15%3
270
May1st to 15thDay
11%30%37%13%5%1
288
16th to endDay
14%23%26%25%6%2
330
June1st to 15thDay
7%20%41%20%8%2
315
16th to endDay
412%36%35%9%1
315
July1st to 15thDay
6%6%34%33%15%3
305
16th to endDay
11%5%27%39%14%1
327
August1st to 15thDay
9%435%31%14%4
315
16th to endDay
10%5%27%38%12%5%
332
September1st to 15thDay
6%13%33%28%13%4
315
16th to endDay
10%16%21%32%15%3
315
October1st to 15thDay
9%31%29%18%8%3
243
16th to endDay
11%19%27%25%13%3
144
November1st to 15thDay
5%21%28%25%16%2
135
16th to endDay
8%30%20%25%14%1
135
December1st to 15thDay
424%31%20%12%6%
135
16th to endDay
8%23%27%21%14%4
144
January1st to 15thNight
7%14%26%24%18%8%
764
16th to endNight
7%16%24%26%18%6%
768
February1st to 15thNight
5%17%27%28%15%5%
704
16th to endNight
6%20%32%23%12%4
632
March1st to 15thNight
5%19%27%27%17%2
720
16th to endNight
420%25%26%17%4
768
April1st to 15thNight
6%29%24%19%15%4
705
16th to endNight
7%27%21%23%15%4
540
May1st to 15thNight
7%14%32%25%17%3
540
16th to endNight
6%18%23%26%18%5%
563
June1st to 15thNight
211%25%36%20%2
540
16th to endNight
25%27%34%25%6%
540
July1st to 15thNight
3110%31%40%11%
510
16th to endNight
5%16%32%44%9%
564
August1st to 15thNight
5%112%33%40%7%
539
16th to endNight
429%28%40%14%
632
September1st to 15thNight
6%314%26%34%13%
720
16th to endNight
410%12%23%32%15%
716
October1st to 15thNight
414%23%27%21%7%
720
16th to endNight
6%13%17%26%25%11%
768
November1st to 15thNight
414%22%27%23%8%
760
16th to endNight
5%16%21%24%24%6%
780
December1st to 15thNight
6%16%25%26%20%4
780
16th to endNight
7%22%25%24%17%2
832
Page generated at 2018-01-12 20:01:37. Version ac04

Copyright 2018 A. Danko


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