Cedar City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cedar City clear sky chart from 2005-11-06 to 2024-02-25.

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
59%
24222
28%
79583
23%
24139
66%
24139
39%
41448

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
52%
750
23%
4031
22%
736
61%
736
22%
2109
January11th to 20thNight
55%
753
26%
4004
26%
740
63%
740
25%
1978
January21st to endNight
49%
825
20%
4287
24%
814
60%
814
20%
2348
February1st to 10thNight
45%
760
23%
2430
18%
760
54%
760
32%
1386
February11th to 20thNight
47%
740
28%
2219
22%
740
57%
740
35%
1260
February21st to endNight
44%
610
27%
1829
22%
610
53%
610
31%
1085
March1st to 10thNight
45%
720
25%
2070
16%
720
55%
720
34%
1210
March11th to 20thNight
51%
720
26%
1980
19%
720
58%
720
37%
1164
March21st to endNight
44%
792
25%
2178
13%
792
54%
792
37%
1276
April1st to 10thNight
45%
720
25%
1980
13%
720
54%
720
38%
1138
April11th to 20thNight
42%
615
29%
1683
14%
615
52%
615
40%
933
April21st to endNight
44%
540
31%
1620
16%
540
57%
540
39%
857
May1st to 10thNight
46%
540
30%
1620
17%
540
56%
540
39%
858
May11th to 20thNight
60%
531
32%
1595
23%
531
65%
531
50%
753
May21st to endNight
56%
582
26%
1746
17%
582
63%
582
42%
888
June1st to 10thNight
70%
540
31%
1620
25%
540
75%
540
57%
732
June11th to 20thNight
63%
540
30%
1620
23%
540
69%
540
57%
724
June21st to endNight
71%
540
30%
1620
26%
540
75%
540
60%
719
July1st to 10thNight
79%
525
29%
1575
25%
525
82%
525
56%
732
July11th to 20thNight
79%
522
23%
1566
22%
522
79%
522
41%
848
July21st to endNight
76%
591
21%
1674
19%
558
76%
558
32%
989
August1st to 10thNight
78%
537
30%
1602
24%
534
80%
534
47%
811
August11th to 20thNight
84%
534
34%
1602
28%
534
85%
534
51%
773
August21st to endNight
80%
699
36%
1887
27%
699
82%
699
56%
959
September1st to 10thNight
76%
720
32%
1975
25%
720
80%
720
53%
1034
September11th to 20thNight
72%
720
39%
1980
27%
720
79%
720
57%
963
September21st to endNight
71%
720
39%
1980
28%
720
79%
720
61%
940
October1st to 10thNight
62%
720
34%
1986
22%
720
71%
720
49%
1040
October11th to 20thNight
70%
720
39%
2160
32%
720
78%
720
59%
981
October21st to endNight
63%
792
39%
2376
29%
792
73%
792
53%
1109
November1st to 10thNight
63%
740
33%
2405
27%
740
72%
740
48%
1105
November11th to 20thNight
62%
760
35%
2470
30%
760
71%
760
49%
1144
November21st to endNight
56%
760
32%
2470
27%
760
65%
760
40%
1255
December1st to 10thNight
56%
760
28%
2470
25%
760
62%
760
36%
1322
December11th to 20thNight
50%
759
28%
2902
22%
758
58%
758
28%
1624
December21st to endNight
41%
825
15%
4371
17%
817
49%
817
17%
2401

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
35%25%5%3445%7%57%
78891
Night
35%2442445%7%59%
80483
TransparencyDay
28%5%8%20%25%15%
78618
Night
25%5%9%21%25%15%
80278
SeeingDay
6%14%25%30%19%6%
13985
Night
5%8%22%35%25%5%
24268

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
37%7%11%6%36%5%46%43%
2858
11th to 20thDay
5%14%35%7%2445%6%46%
2860
21st to endDay
412%45%424446%51%
3146
February1st to 10thDay
27%36%6%35%5%5%7%50%
1748
11th to 20thDay
37%46%6%34448%52%
1850
21st to endDay
27%48%444447%52%
1521
March1st to 10thDay
49%37%435%46%7%49%
1890
11th to 20thDay
38%45%5%36%5%6%7%49%
1980
21st to endDay
410%36%6%36%5%5%7%45%
2178
April1st to 10thDay
38%35%5%345%47%54%
1980
11th to 20thDay
38%35%5%3446%7%53%
2221
21st to endDay
5%5%24424447%58%
2340
May1st to 10thDay
5%5%244245%6%8%55%
2340
11th to 20thDay
44133345%5%8%59%
2301
21st to endDay
5%4245%245%5%8%57%
2530
June1st to 10thDay
121232445%7%68%
2340
11th to 20thDay
2212323335%74%
2340
21st to endDay
1212324445%72%
2340
July1st to 10thDay
22145%45%5%5%6%62%
2340
11th to 20thDay
3326%6%45%7%6%8%51%
2340
21st to endDay
5%426%7%5%7%8%8%10%39%
2545
August1st to 10thDay
32245%35%5%6%8%56%
2328
11th to 20thDay
22145%45%5%5%6%59%
2299
21st to endDay
33235%346%5%7%59%
2465
September1st to 10thDay
5%3245%24445%63%
1984
11th to 20thDay
3213324345%69%
1980
21st to endDay
2212323445%72%
1980
October1st to 10thDay
441332445%7%62%
1972
11th to 20thDay
321332325%5%72%
1800
21st to endDay
342332223472%
1976
November1st to 10thDay
2423324348%65%
1674
11th to 20thDay
2424323447%66%
1710
21st to endDay
27%245%2345%6%60%
1710
December1st to 10thDay
36%25%436%446%57%
1710
11th to 20thDay
38%46%5%3446%11%46%
2169
21st to endDay
310%38%6%35%46%8%44%
3146
January1st to 10thNight
29%6%10%7%24445%47%
4097
11th to 20thNight
6%9%35%5%34447%50%
4110
21st to endNight
411%47%4345%5%7%46%
4521
February1st to 10thNight
28%35%5%445%5%7%51%
2430
11th to 20thNight
36%37%6%35%45%7%53%
2218
21st to endNight
27%27%6%36%5%5%8%49%
1829
March1st to 10thNight
38%24436%5%6%9%49%
2070
11th to 20thNight
36%36%5%36%47%8%51%
1980
21st to endNight
38%344345%5%7%54%
2178
April1st to 10thNight
37%343245%47%57%
1980
11th to 20thNight
5%6%233346%5%7%57%
1683
21st to endNight
6%5%1342446%9%57%
1620
May1st to 10thNight
6%4235%3436%7%59%
1620
11th to 20thNight
331232335%7%67%
1594
21st to endNight
431442445%8%63%
1746
June1st to 10thNight
21122135%48%71%
1620
11th to 20thNight
2112223345%76%
1620
21st to endNight
121321345%7%72%
1620
July1st to 10thNight
212232436%8%67%
1620
11th to 20thNight
42245%35%5%6%7%58%
1620
21st to endNight
4325%6%46%6%8%10%47%
1773
August1st to 10thNight
2214325%45%6%64%
1611
11th to 20thNight
31132245%6%8%65%
1602
21st to endNight
321222445%7%68%
1887
September1st to 10thNight
321342345%6%66%
1975
11th to 20thNight
3112313345%75%
1980
21st to endNight
321222323378%
1980
October1st to 10thNight
4223323345%68%
1986
11th to 20thNight
3312213335%75%
2160
21st to endNight
2323312446%69%
2376
November1st to 10thNight
142332335%7%68%
2405
11th to 20thNight
341342335%7%66%
2470
21st to endNight
2435%424447%60%
2470
December1st to 10thNight
37%25%43445%6%57%
2470
11th to 20thNight
37%45%5%345%5%10%49%
3041
21st to endNight
39%48%6%3445%6%47%
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%11%13%24%19%3
2859
11th to 20thDay
30%10%12%24%18%5%
2860
21st to endDay
35%410%25%21%4
3146
February1st to 10thDay
34%5%12%20%22%8%
1748
11th to 20thDay
33%5%8%21%24%10%
1860
21st to endDay
35%310%21%24%7%
1521
March1st to 10thDay
36%39%23%24%5%
1890
11th to 20thDay
35%5%8%28%19%6%
1980
21st to endDay
39%49%25%18%5%
2178
April1st to 10thDay
32%38%25%22%9%
1980
11th to 20thDay
30%38%23%26%9%
2224
21st to endDay
27%48%25%30%6%
2340
May1st to 10thDay
29%48%22%31%7%
2340
11th to 20thDay
24%411%23%28%9%
2304
21st to endDay
28%5%8%19%33%8%
2530
June1st to 10thDay
17%36%16%37%21%
2340
11th to 20thDay
16%35%11%29%37%
2340
21st to endDay
16%2411%25%42%
2340
July1st to 10thDay
24%46%10%19%37%
2276
11th to 20thDay
30%6%10%15%19%19%
2271
21st to endDay
38%9%13%17%12%12%
2404
August1st to 10thDay
27%6%9%14%16%28%
2313
11th to 20thDay
26%5%8%14%20%27%
2299
21st to endDay
26%48%18%25%18%
2465
September1st to 10thDay
26%5%7%12%22%27%
1984
11th to 20thDay
21%35%17%27%27%
1980
21st to endDay
19%36%14%37%21%
1980
October1st to 10thDay
26%37%18%26%19%
1972
11th to 20thDay
19%25%18%36%21%
1800
21st to endDay
18%36%27%33%14%
1976
November1st to 10thDay
21%29%24%31%13%
1674
11th to 20thDay
21%37%26%33%10%
1710
21st to endDay
27%37%21%29%13%
1710
December1st to 10thDay
29%5%10%22%23%10%
1710
11th to 20thDay
36%5%10%21%21%7%
2168
21st to endDay
33%9%11%17%23%8%
3146
January1st to 10thNight
29%11%11%27%20%3
4097
11th to 20thNight
26%10%15%27%18%5%
4110
21st to endNight
34%7%8%25%20%6%
4521
February1st to 10thNight
31%6%11%23%21%8%
2430
11th to 20thNight
30%5%9%18%25%14%
2219
21st to endNight
35%48%20%27%6%
1829
March1st to 10thNight
32%5%8%24%24%8%
2070
11th to 20thNight
31%49%27%20%9%
1980
21st to endNight
31%411%28%22%5%
2178
April1st to 10thNight
29%47%25%23%12%
1980
11th to 20thNight
26%49%23%28%10%
1683
21st to endNight
25%47%27%31%6%
1620
May1st to 10thNight
26%47%22%33%8%
1620
11th to 20thNight
17%49%28%31%11%
1595
21st to endNight
22%5%7%22%35%10%
1746
June1st to 10thNight
15%35%16%43%19%
1620
11th to 20thNight
13%45%12%28%38%
1620
21st to endNight
15%338%25%47%
1620
July1st to 10thNight
17%37%11%19%43%
1575
11th to 20thNight
26%6%9%17%20%23%
1566
21st to endNight
30%9%16%22%11%12%
1674
August1st to 10thNight
21%5%10%17%18%29%
1602
11th to 20thNight
18%5%11%14%20%32%
1602
21st to endNight
18%47%18%30%23%
1887
September1st to 10thNight
20%48%14%23%32%
1975
11th to 20thNight
16%45%18%25%33%
1980
21st to endNight
14%25%17%37%25%
1980
October1st to 10thNight
22%35%20%27%23%
1986
11th to 20thNight
14%36%15%38%24%
2160
21st to endNight
17%36%23%37%13%
2376
November1st to 10thNight
20%210%24%30%13%
2405
11th to 20thNight
20%39%23%33%13%
2470
21st to endNight
26%37%19%30%16%
2470
December1st to 10thNight
29%411%23%22%11%
2470
11th to 20thNight
33%5%10%22%22%8%
3041
21st to endNight
37%7%10%15%20%12%
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
11%16%29%28%13%2
270
11th to 20thDay
8%16%30%27%14%5%
270
21st to endDay
9%15%23%31%20%2
297
February1st to 10thDay
10%22%30%19%17%3
308
11th to 20thDay
11%24%25%28%10%3
455
21st to endDay
428%31%30%7%1
363
March1st to 10thDay
12%25%26%21%14%1
420
11th to 20thDay
8%22%31%25%11%3
420
21st to endDay
12%29%31%19%8%1
462
April1st to 10thDay
10%20%33%21%13%4
420
11th to 20thDay
8%27%30%24%8%2
412
21st to endDay
10%24%26%25%12%4
420
May1st to 10thDay
8%19%36%23%13%2
423
11th to 20thDay
7%16%26%31%14%5%
448
21st to endDay
7%15%27%30%17%5%
485
June1st to 10thDay
211%28%37%19%4
450
11th to 20thDay
412%29%31%19%5%
450
21st to endDay
27%25%42%19%5%
450
July1st to 10thDay
220%44%24%9%
446
11th to 20thDay
4216%37%29%11%
444
21st to endDay
4210%40%32%12%
487
August1st to 10thDay
3223%37%24%10%
447
11th to 20thDay
2319%34%29%13%
437
21st to endDay
3219%37%28%12%
495
September1st to 10thDay
46%18%33%27%13%
450
11th to 20thDay
314%23%31%23%7%
450
21st to endDay
411%23%31%23%8%
450
October1st to 10thDay
6%14%26%24%21%9%
442
11th to 20thDay
414%16%27%29%11%
270
21st to endDay
6%14%28%27%20%5%
297
November1st to 10thDay
6%17%19%26%25%6%
270
11th to 20thDay
411%27%29%21%8%
270
21st to endDay
9%13%24%24%24%7%
270
December1st to 10thDay
5%11%26%33%20%5%
270
11th to 20thDay
11%7%30%28%19%6%
270
21st to endDay
11%21%22%34%10%2
297
January1st to 10thNight
5%9%27%31%20%7%
760
11th to 20thNight
5%8%27%36%19%4
760
21st to endNight
7%10%27%33%19%4
836
February1st to 10thNight
6%11%32%31%17%3
760
11th to 20thNight
6%11%29%36%14%3
744
21st to endNight
7%11%33%32%13%3
610
March1st to 10thNight
7%14%30%31%15%3
720
11th to 20thNight
6%10%27%33%22%3
720
21st to endNight
7%13%31%34%14%2
792
April1st to 10thNight
6%14%30%30%17%3
720
11th to 20thNight
8%13%32%29%14%3
615
21st to endNight
8%15%28%27%18%4
540
May1st to 10thNight
7%10%32%36%14%2
540
11th to 20thNight
5%8%23%35%25%4
531
21st to endNight
5%9%23%35%24%3
584
June1st to 10thNight
25%20%44%28%1
540
11th to 20thNight
26%24%41%23%3
540
21st to endNight
1219%41%32%5%
540
July1st to 10thNight
2111%37%42%8%
525
11th to 20thNight
5%16%37%43%8%
522
21st to endNight
5%15%33%48%8%
591
August1st to 10thNight
2110%40%41%6%
537
11th to 20thNight
216%40%44%6%
534
21st to endNight
3210%36%39%10%
699
September1st to 10thNight
4310%33%40%10%
720
11th to 20thNight
2416%37%31%9%
720
21st to endNight
35%17%31%34%10%
720
October1st to 10thNight
5%7%22%38%23%5%
720
11th to 20thNight
4420%39%26%8%
720
21st to endNight
48%21%33%25%9%
792
November1st to 10thNight
49%19%36%25%6%
740
11th to 20thNight
5%7%22%38%21%7%
760
21st to endNight
5%10%23%32%25%5%
760
December1st to 10thNight
6%7%24%38%19%5%
760
11th to 20thNight
7%7%29%36%19%3
760
21st to endNight
10%12%28%34%14%2
836
Page generated at 2024-02-22 04:05:47. Version ac07

Copyright 2024 Attilla Danko


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