Red Rock Canyon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Red Rock Canyon clear sky chart from 2005-11-06 to 2024-11-11.

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
67%
25397
38%
96002
29%
25186
77%
25186
53%
36677

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
63%
751
41%
3981
30%
736
73%
736
37%
1433
January11th to 20thNight
68%
751
41%
3951
34%
740
79%
740
40%
1414
January21st to endNight
59%
826
27%
4116
30%
814
74%
814
31%
1822
February1st to 10thNight
60%
760
38%
2280
27%
760
74%
760
50%
1087
February11th to 20thNight
57%
740
40%
2219
29%
740
74%
740
51%
1040
February21st to endNight
52%
628
37%
1884
27%
628
67%
628
49%
882
March1st to 10thNight
51%
751
41%
3637
24%
744
69%
744
38%
1328
March11th to 20thNight
56%
755
33%
3483
25%
740
69%
740
32%
1567
March21st to endNight
51%
831
24%
3591
19%
814
67%
814
40%
1399
April1st to 10thNight
53%
760
40%
1907
17%
760
67%
760
58%
943
April11th to 20thNight
51%
751
38%
1879
16%
751
63%
751
57%
935
April21st to endNight
60%
632
42%
1772
21%
632
72%
632
63%
774
May1st to 10thNight
54%
564
50%
2624
20%
559
67%
559
57%
735
May11th to 20thNight
63%
548
36%
2697
26%
541
73%
541
61%
717
May21st to endNight
62%
597
29%
3054
24%
593
72%
593
62%
745
June1st to 10thNight
69%
570
38%
1710
28%
570
77%
570
75%
663
June11th to 20thNight
64%
570
36%
1710
27%
570
72%
570
72%
667
June21st to endNight
72%
570
35%
1710
28%
570
78%
570
75%
661
July1st to 10thNight
86%
539
43%
2324
32%
535
89%
535
70%
663
July11th to 20thNight
86%
538
33%
2109
30%
533
87%
533
58%
762
July21st to endNight
83%
613
33%
2338
31%
569
85%
569
51%
887
August1st to 10thNight
79%
554
46%
2285
32%
545
82%
545
53%
842
August11th to 20thNight
86%
733
36%
2463
25%
718
90%
718
73%
873
August21st to endNight
85%
825
41%
2817
29%
814
88%
814
74%
959
September1st to 10thNight
83%
760
42%
1980
30%
760
87%
760
69%
930
September11th to 20thNight
80%
760
45%
2090
34%
760
87%
760
77%
871
September21st to endNight
78%
760
46%
2090
34%
760
87%
760
76%
871
October1st to 10thNight
70%
742
58%
3049
31%
740
82%
740
67%
915
October11th to 20thNight
71%
754
37%
3050
37%
740
81%
740
65%
954
October21st to endNight
67%
823
46%
3990
35%
813
82%
813
58%
1133
November1st to 10thNight
72%
780
43%
2535
38%
780
84%
780
67%
967
November11th to 20thNight
75%
762
43%
2476
38%
762
86%
762
65%
958
November21st to endNight
66%
760
42%
2470
36%
760
77%
760
59%
1016
December1st to 10thNight
65%
760
37%
2470
32%
760
75%
760
51%
1119
December11th to 20thNight
65%
758
36%
2890
30%
758
76%
758
41%
1342
December21st to endNight
57%
821
23%
4371
28%
817
70%
817
30%
1803

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
2212223346%74%
105039
Night
2212223246%75%
102938
TransparencyDay
13%2415%27%40%
104803
Night
13%2416%27%39%
102764
SeeingDay
49%23%34%22%7%
15357
Night
37%19%35%29%7%
25612

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
211222336%8%71%
2858
11th to 20thDay
221333325%7%67%
2860
21st to endDay
6%5%2433345%6%59%
3247
February1st to 10thDay
431222335%6%67%
1900
11th to 20thDay
2312225%45%7%67%
1850
21st to endDay
231423425%7%66%
1570
March1st to 10thDay
121333335%9%68%
3138
11th to 20thDay
5%6%1433335%6%61%
3456
21st to endDay
341433445%7%60%
3825
April1st to 10thDay
121332336%7%69%
2270
11th to 20thDay
121332333475%
2249
21st to endDay
2212222245%76%
2405
May1st to 10thDay
11222224480%
4110
11th to 20thDay
1112222345%78%
4071
21st to endDay
112112235%83%
4477
June1st to 10thDay
111222336%79%
2470
11th to 20thDay
1111223484%
2470
21st to endDay
11122123484%
2470
July1st to 10thDay
111221222384%
4110
11th to 20thDay
221224446%6%67%
4110
21st to endDay
221333336%7%68%
4454
August1st to 10thDay
2213233346%72%
4092
11th to 20thDay
111112223482%
3733
21st to endDay
11111223483%
4180
September1st to 10thDay
3212223346%73%
2199
11th to 20thDay
111112113484%
2090
21st to endDay
121212223481%
2090
October1st to 10thDay
111112212484%
3490
11th to 20thDay
11111223484%
3383
21st to endDay
1112223483%
3203
November1st to 10thDay
111213346%77%
1764
11th to 20thDay
1112124346%76%
1710
21st to endDay
3212322348%71%
1710
December1st to 10thDay
221333435%8%67%
1710
11th to 20thDay
2215%45%5%47%10%55%
2169
21st to endDay
431333446%8%59%
3146
January1st to 10thNight
131433435%6%68%
4097
11th to 20thNight
111333445%7%68%
4110
21st to endNight
7%41333336%7%60%
4419
February1st to 10thNight
3313333346%67%
2280
11th to 20thNight
231322335%5%70%
2218
21st to endNight
331222436%7%67%
1884
March1st to 10thNight
1313233347%69%
3736
11th to 20thNight
45%25%33445%7%58%
3522
21st to endNight
131323435%7%68%
3828
April1st to 10thNight
221223336%6%72%
1907
11th to 20thNight
121322325%5%74%
1879
21st to endNight
11222234478%
1772
May1st to 10thNight
11111222484%
2860
11th to 20thNight
111112235%83%
2834
21st to endNight
11111212486%
3110
June1st to 10thNight
11121226%82%
1710
11th to 20thNight
111111213483%
1710
21st to endNight
11111113484%
1710
July1st to 10thNight
1111212388%
2860
11th to 20thNight
222222246%77%
2860
21st to endNight
121222335%8%70%
3109
August1st to 10thNight
221322213478%
2847
11th to 20thNight
111112235%84%
3113
21st to endNight
11111112387%
3498
September1st to 10thNight
2212223245%77%
1980
11th to 20thNight
111111212386%
2090
21st to endNight
11111213385%
2090
October1st to 10thNight
11111112387%
3490
11th to 20thNight
11211122484%
3551
21st to endNight
11111224481%
4351
November1st to 10thNight
122121245%80%
2535
11th to 20thNight
121212225%6%77%
2476
21st to endNight
2213222337%74%
2470
December1st to 10thNight
3312244347%67%
2470
11th to 20thNight
231443446%10%59%
3041
21st to endNight
44143345%6%8%58%
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
13%28%31%36%10%
2859
11th to 20thDay
18%113%33%23%11%
2860
21st to endDay
26%29%27%28%8%
3247
February1st to 10thDay
17%37%22%31%20%
1900
11th to 20thDay
15%25%21%34%23%
1860
21st to endDay
20%27%20%31%19%
1570
March1st to 10thDay
15%37%26%30%20%
3138
11th to 20thDay
22%5%6%25%29%15%
3456
21st to endDay
18%7%6%27%30%13%
3825
April1st to 10thDay
16%2419%31%28%
2270
11th to 20thDay
14%2215%31%36%
2252
21st to endDay
11%2215%38%32%
2405
May1st to 10thDay
9%2210%34%44%
4110
11th to 20thDay
8%319%31%48%
4074
21st to endDay
7%128%29%53%
4477
June1st to 10thDay
8%119%24%55%
2470
11th to 20thDay
6%216%18%68%
2470
21st to endDay
8%1315%72%
2470
July1st to 10thDay
9%1138%78%
4046
11th to 20thDay
14%448%20%50%
4041
21st to endDay
14%3414%17%48%
4314
August1st to 10thDay
14%3211%30%40%
4078
11th to 20thDay
8%228%21%60%
3769
21st to endDay
8%216%15%69%
4179
September1st to 10thDay
14%227%18%56%
2199
11th to 20thDay
7%227%24%59%
2090
21st to endDay
9%117%27%54%
2090
October1st to 10thDay
8%127%19%63%
3490
11th to 20thDay
7%1210%33%48%
3383
21st to endDay
7%2310%39%39%
3203
November1st to 10thDay
9%2316%40%30%
1764
11th to 20thDay
12%2417%38%27%
1710
21st to endDay
15%1322%34%25%
1710
December1st to 10thDay
18%29%21%30%20%
1710
11th to 20thDay
24%411%24%28%9%
2168
21st to endDay
24%212%28%23%11%
3146
January1st to 10thNight
19%25%24%38%12%
4097
11th to 20thNight
18%29%35%25%11%
4110
21st to endNight
26%18%26%29%10%
4419
February1st to 10thNight
19%28%19%31%21%
2280
11th to 20thNight
18%25%20%28%27%
2219
21st to endNight
18%35%18%36%20%
1884
March1st to 10thNight
17%36%23%32%19%
3736
11th to 20thNight
22%6%426%25%18%
3522
21st to endNight
16%35%20%35%21%
3828
April1st to 10thNight
14%25%19%32%28%
1907
11th to 20thNight
13%3215%34%32%
1879
21st to endNight
11%2116%32%38%
1772
May1st to 10thNight
8%1310%31%47%
2860
11th to 20thNight
6%219%29%53%
2835
21st to endNight
6%117%25%59%
3110
June1st to 10thNight
6%218%23%59%
1710
11th to 20thNight
8%115%18%67%
1710
21st to endNight
7%1312%77%
1710
July1st to 10thNight
6%1147%81%
2815
11th to 20thNight
9%237%21%57%
2806
21st to endNight
12%3315%18%49%
3011
August1st to 10thNight
12%2210%26%48%
2838
11th to 20thNight
6%129%19%62%
3143
21st to endNight
6%11415%72%
3498
September1st to 10thNight
12%2210%17%58%
1980
11th to 20thNight
7%127%23%60%
2090
21st to endNight
8%117%24%60%
2090
October1st to 10thNight
7%117%16%68%
3490
11th to 20thNight
7%116%30%54%
3551
21st to endNight
8%2313%29%46%
4351
November1st to 10thNight
9%2318%38%31%
2535
11th to 20thNight
11%15%15%36%32%
2476
21st to endNight
13%1417%32%33%
2470
December1st to 10thNight
19%27%22%29%21%
2470
11th to 20thNight
22%39%22%29%14%
3041
21st to endNight
24%211%28%25%10%
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
10%10%27%37%12%3
270
11th to 20thDay
8%9%24%36%17%6%
270
21st to endDay
7%12%21%32%24%5%
359
February1st to 10thDay
8%14%27%31%16%4
460
11th to 20thDay
7%15%27%37%12%2
455
21st to endDay
8%16%32%31%11%2
382
March1st to 10thDay
10%20%29%25%14%1
460
11th to 20thDay
7%17%32%29%14%2
460
21st to endDay
8%19%35%26%9%1
506
April1st to 10thDay
8%14%29%29%17%3
460
11th to 20thDay
6%19%34%25%12%2
452
21st to endDay
6%17%25%30%17%5%
460
May1st to 10thDay
5%14%32%27%16%5%
463
11th to 20thDay
311%26%34%17%8%
488
21st to endDay
410%22%36%18%9%
529
June1st to 10thDay
28%22%35%21%11%
490
11th to 20thDay
18%27%33%22%8%
490
21st to endDay
2423%38%22%9%
490
July1st to 10thDay
1215%43%27%11%
486
11th to 20thDay
3111%40%32%14%
484
21st to endDay
337%37%36%15%
531
August1st to 10thDay
3116%43%22%14%
487
11th to 20thDay
2316%37%30%12%
477
21st to endDay
3214%36%35%10%
539
September1st to 10thDay
2414%39%32%9%
490
11th to 20thDay
27%25%37%25%3
490
21st to endDay
35%24%35%29%5%
490
October1st to 10thDay
27%25%35%26%5%
490
11th to 20thDay
47%21%36%27%5%
442
21st to endDay
27%23%35%24%8%
330
November1st to 10thDay
5%12%22%30%26%4
300
11th to 20thDay
36%21%39%22%10%
270
21st to endDay
37%25%27%29%9%
270
December1st to 10thDay
26%23%43%21%4
270
11th to 20thDay
27%25%35%23%8%
270
21st to endDay
8%10%31%31%16%4
297
January1st to 10thNight
48%19%34%26%10%
760
11th to 20thNight
36%18%40%25%8%
760
21st to endNight
7%7%21%36%22%7%
836
February1st to 10thNight
48%22%36%23%7%
760
11th to 20thNight
49%26%35%20%5%
744
21st to endNight
7%11%28%32%17%5%
628
March1st to 10thNight
413%27%35%17%5%
760
11th to 20thNight
5%11%23%31%22%8%
760
21st to endNight
416%26%34%16%4
836
April1st to 10thNight
313%28%31%20%6%
760
11th to 20thNight
314%28%32%18%5%
751
21st to endNight
29%26%36%21%6%
632
May1st to 10thNight
49%30%34%20%4
570
11th to 20thNight
27%24%33%29%5%
561
21st to endNight
210%21%33%28%6%
617
June1st to 10thNight
15%22%41%26%4
570
11th to 20thNight
26%26%32%28%5%
570
21st to endNight
1420%39%31%6%
570
July1st to 10thNight
18%42%41%7%
555
11th to 20thNight
315%41%44%5%
552
21st to endNight
32334%51%7%
624
August1st to 10thNight
318%44%39%5%
567
11th to 20thNight
118%32%48%10%
739
21st to endNight
227%31%43%15%
836
September1st to 10thNight
327%32%44%13%
760
11th to 20thNight
1214%37%35%11%
760
21st to endNight
1315%34%34%13%
760
October1st to 10thNight
35%18%40%28%6%
760
11th to 20thNight
4418%35%29%11%
760
21st to endNight
38%19%28%31%12%
836
November1st to 10thNight
36%16%35%31%9%
780
11th to 20thNight
25%15%40%31%8%
762
21st to endNight
27%20%35%28%8%
760
December1st to 10thNight
5%5%20%36%28%6%
760
11th to 20thNight
5%5%19%38%28%5%
760
21st to endNight
411%20%37%22%5%
836
Page generated at 2024-11-08 03:44:50. Version ac07

Copyright © 2024 Attilla Danko.


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