Silver City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Silver City clear sky chart from 2005-11-06 to 2024-12-24.

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
60%
24504
34%
98358
25%
24305
72%
24305
40%
43210

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
55%
753
39%
3985
27%
736
69%
736
32%
1603
January11th to 20thNight
54%
755
45%
3902
28%
740
69%
740
42%
1299
January21st to endNight
50%
828
25%
4245
26%
814
68%
814
25%
2147
February1st to 10thNight
53%
760
36%
2470
26%
760
69%
760
48%
1144
February11th to 20thNight
47%
741
34%
2284
23%
740
62%
740
45%
1127
February21st to endNight
36%
628
40%
1735
19%
628
56%
628
49%
882
March1st to 10thNight
42%
753
49%
3322
18%
744
63%
744
44%
1210
March11th to 20thNight
50%
757
38%
3437
19%
740
66%
740
36%
1486
March21st to endNight
44%
829
27%
3610
16%
814
63%
814
42%
1393
April1st to 10thNight
46%
633
41%
1963
20%
633
69%
633
55%
860
April11th to 20thNight
44%
563
41%
1877
22%
563
69%
563
55%
760
April21st to endNight
47%
570
42%
1900
24%
570
73%
570
56%
753
May1st to 10thNight
53%
564
49%
2916
27%
559
71%
559
58%
786
May11th to 20thNight
59%
549
32%
2791
25%
541
70%
541
44%
917
May21st to endNight
59%
610
30%
3054
26%
593
73%
593
64%
764
June1st to 10thNight
68%
570
33%
1710
27%
570
73%
570
51%
817
June11th to 20thNight
69%
570
33%
1710
25%
570
76%
570
62%
744
June21st to endNight
67%
570
20%
1710
16%
570
69%
570
37%
954
July1st to 10thNight
72%
540
25%
2485
19%
535
74%
535
27%
1232
July11th to 20thNight
76%
536
17%
2317
15%
533
76%
533
21%
1334
July21st to endNight
72%
605
11%
2757
14%
569
73%
569
18%
1665
August1st to 10thNight
76%
555
20%
2523
17%
545
76%
545
23%
1370
August11th to 20thNight
75%
544
19%
2717
24%
543
76%
543
22%
1432
August21st to endNight
75%
610
16%
3316
24%
605
76%
605
17%
1979
September1st to 10thNight
75%
570
30%
1900
32%
570
77%
570
35%
1041
September11th to 20thNight
79%
658
35%
1988
32%
658
81%
658
45%
1040
September21st to endNight
76%
760
35%
2137
26%
760
81%
760
57%
1054
October1st to 10thNight
72%
741
48%
3342
26%
740
78%
740
46%
1220
October11th to 20thNight
71%
746
32%
3339
29%
740
80%
740
49%
1229
October21st to endNight
70%
818
48%
3760
31%
813
80%
813
60%
1140
November1st to 10thNight
72%
780
45%
2340
32%
780
81%
780
64%
1017
November11th to 20thNight
66%
800
41%
2400
29%
800
75%
800
60%
1060
November21st to endNight
56%
800
41%
2405
27%
800
69%
800
47%
1193
December1st to 10thNight
61%
800
39%
2600
32%
800
71%
800
48%
1218
December11th to 20thNight
54%
798
32%
3044
25%
798
67%
798
37%
1522
December21st to endNight
53%
840
24%
4367
28%
831
66%
831
31%
1818

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
331434445%7%62%
105393
Night
331433435%7%62%
103486
TransparencyDay
21%46%16%29%25%
105156
Night
21%36%17%29%23%
103312
SeeingDay
6%10%24%31%21%8%
14658
Night
5%5%22%39%24%4
24731

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
2315%5%45%445%62%
2858
11th to 20thDay
331433335%7%67%
2860
21st to endDay
8%5%25%43447%8%51%
3146
February1st to 10thDay
25%24333446%64%
1710
11th to 20thDay
5%42443335%5%63%
1782
21st to endDay
35%2423335%465%
1715
March1st to 10thDay
25%14334345%66%
3444
11th to 20thDay
6%5%1443435%7%59%
3490
21st to endDay
1325%45%5%48%8%55%
3825
April1st to 10thDay
131333425%6%70%
2215
11th to 20thDay
2312222245%76%
2251
21st to endDay
1212222235%76%
2280
May1st to 10thDay
11211223483%
3800
11th to 20thDay
121222235%6%74%
3997
21st to endDay
11111122386%
4477
June1st to 10thDay
231333325%9%66%
2470
11th to 20thDay
2212223346%74%
2470
21st to endDay
3425%45%5%5%7%7%54%
2470
July1st to 10thDay
3215%5%5%5%5%7%8%53%
4110
11th to 20thDay
2325%5%6%8%6%8%10%44%
4110
21st to endDay
5%428%6%7%9%7%10%11%31%
4454
August1st to 10thDay
3426%5%5%8%5%9%10%43%
4092
11th to 20thDay
3314446%5%8%10%51%
3736
21st to endDay
5%427%6%6%7%6%8%9%39%
4180
September1st to 10thDay
8%5%16%5%5%5%5%6%7%46%
2280
11th to 20thDay
5%41434446%7%57%
2186
21st to endDay
3214323446%67%
2043
October1st to 10thDay
3212223346%73%
3170
11th to 20thDay
3213233235%73%
3150
21st to endDay
121111112484%
3438
November1st to 10thDay
1212233247%71%
1959
11th to 20thDay
2323223346%71%
2000
21st to endDay
45%25%34435%7%59%
1993
December1st to 10thDay
431332436%7%63%
1800
11th to 20thDay
5%6%27%5%43347%54%
2259
21st to endDay
241334446%6%62%
3173
January1st to 10thNight
35%2434435%7%60%
4097
11th to 20thNight
2312323235%74%
4110
21st to endNight
8%6%26%44346%9%49%
4521
February1st to 10thNight
231444446%6%64%
2470
11th to 20thNight
5%315%333346%63%
2283
21st to endNight
2414434345%66%
1735
March1st to 10thNight
231332345%7%68%
3430
11th to 20thNight
5%5%14333246%63%
3490
21st to endNight
121333346%9%64%
3828
April1st to 10thNight
121232435%6%70%
1963
11th to 20thNight
2213222245%74%
1877
21st to endNight
1212322245%76%
1900
May1st to 10thNight
111112213483%
3170
11th to 20thNight
2212223345%73%
2904
21st to endNight
11111122385%
3110
June1st to 10thNight
331334445%6%64%
1710
11th to 20thNight
2212233347%72%
1710
21st to endNight
4426%6%5%5%5%7%7%49%
1710
July1st to 10thNight
3325%5%5%5%5%9%11%48%
2860
11th to 20thNight
2326%5%6%8%6%9%14%38%
2860
21st to endNight
45%28%7%6%7%7%10%14%30%
3109
August1st to 10thNight
3315%6%6%7%6%10%16%37%
2847
11th to 20thNight
2426%5%6%7%6%9%12%42%
3100
21st to endNight
45%28%7%8%8%7%10%10%32%
3487
September1st to 10thNight
5%5%26%346%5%7%9%49%
1900
11th to 20thNight
4315%33446%7%59%
1988
21st to endNight
3313333245%69%
2137
October1st to 10thNight
3212233345%73%
3800
11th to 20thNight
3212222235%75%
3778
21st to endNight
11122224481%
4120
November1st to 10thNight
222323246%73%
2340
11th to 20thNight
231222325%5%73%
2400
21st to endNight
5%414333347%63%
2405
December1st to 10thNight
5%31334335%7%64%
2600
11th to 20thNight
3416%435%46%7%56%
3171
21st to endNight
5%42433435%6%61%
4566

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
22%4215%41%16%
2859
11th to 20thDay
17%4422%37%17%
2860
21st to endDay
27%5%324%28%12%
3146
February1st to 10thDay
19%4415%28%29%
1710
11th to 20thDay
22%4315%30%27%
1791
21st to endDay
20%3212%31%32%
1715
March1st to 10thDay
20%329%41%24%
3444
11th to 20thDay
25%3319%33%17%
3490
21st to endDay
22%5%318%36%16%
3825
April1st to 10thDay
15%3212%39%29%
2215
11th to 20thDay
12%3110%33%41%
2254
21st to endDay
11%3213%36%36%
2280
May1st to 10thDay
8%218%29%52%
3800
11th to 20thDay
11%3311%33%39%
4000
21st to endDay
6%215%19%67%
4477
June1st to 10thDay
17%2213%32%34%
2470
11th to 20thDay
12%318%24%52%
2470
21st to endDay
25%6%8%15%20%27%
2470
July1st to 10thDay
26%5%12%14%20%24%
4046
11th to 20thDay
31%5%14%25%22%4
4041
21st to endDay
41%6%24%22%6%1
4314
August1st to 10thDay
31%5%14%31%15%3
4078
11th to 20thDay
24%5%10%22%34%5%
3772
21st to endDay
37%5%16%18%19%6%
4179
September1st to 10thDay
33%6%9%19%20%13%
2280
11th to 20thDay
24%5%5%18%31%17%
2186
21st to endDay
17%5%418%33%24%
2043
October1st to 10thDay
14%3411%29%39%
3170
11th to 20thDay
17%2211%39%29%
3150
21st to endDay
9%129%34%46%
3438
November1st to 10thDay
15%2319%33%28%
1959
11th to 20thDay
16%2317%33%29%
2000
21st to endDay
25%35%17%30%21%
1993
December1st to 10thDay
20%45%23%31%18%
1800
11th to 20thDay
31%35%20%25%16%
2258
21st to endDay
19%5%417%35%20%
3173
January1st to 10thNight
22%4316%40%14%
4097
11th to 20thNight
16%2322%43%15%
4110
21st to endNight
31%3423%28%11%
4521
February1st to 10thNight
18%5%5%17%28%28%
2470
11th to 20thNight
21%4318%30%25%
2284
21st to endNight
19%4215%31%30%
1735
March1st to 10thNight
14%4314%46%20%
3430
11th to 20thNight
22%4318%37%16%
3490
21st to endNight
16%3329%35%14%
3828
April1st to 10thNight
13%4315%40%25%
1963
11th to 20thNight
13%3112%33%39%
1877
21st to endNight
11%3215%37%31%
1900
May1st to 10thNight
8%218%36%46%
3170
11th to 20thNight
13%4311%33%35%
2905
21st to endNight
7%116%20%65%
3110
June1st to 10thNight
19%3312%29%33%
1710
11th to 20thNight
13%338%25%49%
1710
21st to endNight
30%5%9%12%17%26%
1710
July1st to 10thNight
27%5%14%16%19%20%
2815
11th to 20thNight
32%5%14%26%18%4
2806
21st to endNight
40%5%25%24%5%1
3011
August1st to 10thNight
31%6%19%31%10%3
2838
11th to 20thNight
31%5%12%18%29%4
3130
21st to endNight
41%5%18%17%15%3
3487
September1st to 10thNight
29%6%12%19%20%14%
1900
11th to 20thNight
23%5%7%19%27%18%
1988
21st to endNight
18%37%17%33%22%
2137
October1st to 10thNight
14%3410%33%36%
3800
11th to 20thNight
15%1315%35%32%
3778
21st to endNight
9%1111%30%47%
4120
November1st to 10thNight
13%2417%37%28%
2340
11th to 20thNight
14%2319%32%30%
2400
21st to endNight
22%3418%31%22%
2405
December1st to 10thNight
20%35%22%29%20%
2600
11th to 20thNight
25%47%19%27%19%
3171
21st to endNight
23%3417%30%22%
4566

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%13%34%28%12%2
270
11th to 20thDay
9%11%31%29%13%6%
270
21st to endDay
5%9%31%34%16%4
297
February1st to 10thDay
5%14%31%27%18%5%
270
11th to 20thDay
10%14%31%35%11%
270
21st to endDay
11%28%36%19%5%1
370
March1st to 10thDay
8%22%38%25%6%1
460
11th to 20thDay
10%18%31%29%10%3
460
21st to endDay
6%28%40%17%8%1
506
April1st to 10thDay
6%19%35%26%12%2
460
11th to 20thDay
7%21%33%27%9%2
452
21st to endDay
6%16%38%26%12%2
460
May1st to 10thDay
5%13%35%31%14%1
463
11th to 20thDay
210%31%39%15%4
488
21st to endDay
311%35%35%15%1
529
June1st to 10thDay
5%428%40%21%4
490
11th to 20thDay
3429%37%22%5%
490
21st to endDay
6%217%38%28%9%
490
July1st to 10thDay
5%29%36%32%16%
486
11th to 20thDay
5%1329%39%22%
484
21st to endDay
6%2321%43%25%
531
August1st to 10thDay
5%2324%40%24%
487
11th to 20thDay
7%27%30%37%18%
477
21st to endDay
5%16%27%39%21%
539
September1st to 10thDay
10%49%36%30%13%
490
11th to 20thDay
5%214%37%30%11%
490
21st to endDay
5%321%38%24%8%
443
October1st to 10thDay
6%6%20%32%24%11%
300
11th to 20thDay
8%7%19%35%23%8%
300
21st to endDay
48%22%28%27%11%
330
November1st to 10thDay
49%29%33%18%6%
300
11th to 20thDay
47%24%35%23%6%
300
21st to endDay
7%14%29%32%15%3
300
December1st to 10thDay
5%8%28%35%20%3
300
11th to 20thDay
6%12%30%34%15%4
300
21st to endDay
7%15%33%33%10%3
306
January1st to 10thNight
6%9%25%38%18%5%
760
11th to 20thNight
5%6%29%37%19%4
760
21st to endNight
9%7%26%38%16%3
836
February1st to 10thNight
38%31%36%17%4
760
11th to 20thNight
6%9%32%40%11%2
744
21st to endNight
5%14%42%31%9%1
628
March1st to 10thNight
411%39%33%13%1
760
11th to 20thNight
48%33%37%15%3
760
21st to endNight
310%38%34%13%1
836
April1st to 10thNight
210%37%39%10%1
633
11th to 20thNight
311%39%34%11%1
563
21st to endNight
311%35%37%12%2
570
May1st to 10thNight
36%34%45%10%1
570
11th to 20thNight
3427%49%16%1
561
21st to endNight
2430%48%15%
617
June1st to 10thNight
4218%52%22%2
570
11th to 20thNight
3320%53%20%1
570
21st to endNight
6%214%42%31%4
570
July1st to 10thNight
6%17%37%42%8%
555
11th to 20thNight
41327%54%12%
552
21st to endNight
5%2324%55%12%
624
August1st to 10thNight
5%2123%52%17%
567
11th to 20thNight
42427%53%10%
564
21st to endNight
5%1427%54%9%
627
September1st to 10thNight
6%25%37%46%5%
570
11th to 20thNight
7%16%43%38%5%
658
21st to endNight
4211%43%33%6%
760
October1st to 10thNight
5%115%48%28%3
760
11th to 20thNight
4418%46%26%3
760
21st to endNight
3419%41%26%7%
836
November1st to 10thNight
3319%44%24%7%
780
11th to 20thNight
3422%42%25%4
800
21st to endNight
7%6%24%38%21%5%
800
December1st to 10thNight
6%5%24%41%20%5%
800
11th to 20thNight
5%7%26%42%17%3
800
21st to endNight
7%10%23%40%17%3
850
Page generated at 2024-12-21 02:13:52. Version ac07

Copyright © 2024 Attilla Danko.


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