Celescina Ramah New Mexico Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Celescina Ramah New Mexico Observatory clear sky chart from 2005-11-06 to 2024-03-01.

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
55%
24059
30%
79845
21%
23959
65%
23959
40%
40280

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%
757
29%
4021
25%
736
65%
736
27%
1842
January11th to 20thNight
48%
756
40%
3909
26%
740
62%
740
35%
1442
January21st to endNight
48%
829
21%
4320
23%
814
62%
814
21%
2442
February1st to 10thNight
44%
760
31%
2470
22%
760
60%
760
42%
1234
February11th to 20thNight
39%
741
28%
2334
18%
740
53%
740
39%
1209
February21st to endNight
36%
628
36%
1783
17%
628
54%
628
44%
921
March1st to 10thNight
42%
722
36%
1985
18%
722
58%
722
49%
1014
March11th to 20thNight
50%
720
34%
1980
19%
720
62%
720
47%
1036
March21st to endNight
42%
792
32%
2178
14%
792
57%
792
44%
1176
April1st to 10thNight
39%
585
34%
1845
16%
585
60%
585
49%
821
April11th to 20thNight
39%
533
34%
1777
18%
533
61%
533
44%
799
April21st to endNight
40%
540
36%
1800
18%
540
63%
540
47%
800
May1st to 10thNight
47%
540
33%
1742
22%
540
62%
540
49%
801
May11th to 20thNight
52%
531
28%
1594
19%
531
62%
531
44%
805
May21st to endNight
51%
582
32%
1746
18%
582
65%
582
58%
772
June1st to 10thNight
59%
540
30%
1620
24%
540
65%
540
50%
778
June11th to 20thNight
61%
540
31%
1620
24%
540
67%
540
60%
719
June21st to endNight
65%
540
21%
1620
18%
540
67%
540
40%
870
July1st to 10thNight
70%
525
17%
1575
14%
525
71%
525
30%
949
July11th to 20thNight
74%
522
13%
1566
11%
522
74%
522
26%
1008
July21st to endNight
67%
591
11%
1674
10%
558
67%
558
18%
1194
August1st to 10thNight
77%
537
15%
1602
14%
534
78%
534
29%
982
August11th to 20thNight
68%
534
18%
1708
18%
534
69%
534
22%
1112
August21st to endNight
76%
594
23%
1980
24%
594
77%
594
32%
1132
September1st to 10thNight
69%
540
26%
1800
29%
540
70%
540
29%
1085
September11th to 20thNight
75%
611
34%
1871
31%
611
79%
611
44%
993
September21st to endNight
67%
720
32%
2028
21%
720
75%
720
51%
1037
October1st to 10thNight
55%
720
31%
2160
18%
720
65%
720
47%
1108
October11th to 20thNight
68%
720
41%
2160
27%
720
78%
720
61%
951
October21st to endNight
62%
792
42%
2376
27%
792
73%
792
56%
1093
November1st to 10thNight
63%
740
42%
2220
27%
740
75%
740
61%
960
November11th to 20thNight
64%
760
41%
2280
28%
760
74%
760
58%
1016
November21st to endNight
52%
863
35%
2497
22%
863
62%
863
45%
1289
December1st to 10thNight
53%
950
32%
2660
20%
950
62%
950
46%
1404
December11th to 20thNight
42%
876
29%
3035
19%
876
52%
876
33%
1660
December21st to endNight
42%
828
21%
4309
20%
817
55%
817
27%
1826

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
45%25%5%345%5%7%56%
78595
Night
35%2442445%7%59%
80865
TransparencyDay
26%5%9%18%26%16%
78321
Night
23%6%9%19%27%16%
80660
SeeingDay
7%12%25%28%20%8%
13502
Night
48%27%36%22%3
24087

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
28%5%7%5%2335%5%54%
2858
11th to 20thDay
25%35%3135%5%6%62%
2860
21st to endDay
412%6%8%5%2445%5%46%
3146
February1st to 10thDay
18%35%423447%58%
1710
11th to 20thDay
27%36%5%34448%55%
1731
21st to endDay
39%35%424446%55%
1668
March1st to 10thDay
36%344245%5%9%55%
1981
11th to 20thDay
37%36%424445%56%
1980
21st to endDay
35%2443436%7%58%
2178
April1st to 10thDay
2324424447%64%
2114
11th to 20thDay
342443445%6%62%
2131
21st to endDay
4413314446%65%
2160
May1st to 10thDay
4323324446%65%
2215
11th to 20thDay
4325%5%36%6%46%57%
2301
21st to endDay
3313323445%68%
2530
June1st to 10thDay
321242445%8%65%
2340
11th to 20thDay
3213323335%73%
2340
21st to endDay
23245%36%5%5%7%58%
2340
July1st to 10thDay
6%436%7%5%6%6%7%10%41%
2340
11th to 20thDay
5%336%8%5%8%9%8%9%37%
2340
21st to endDay
8%5%38%8%5%8%8%9%10%29%
2545
August1st to 10thDay
8%5%27%8%5%7%6%7%8%36%
2328
11th to 20thDay
7%5%36%7%5%7%6%7%9%39%
2192
21st to endDay
8%425%7%45%7%7%8%43%
2376
September1st to 10thDay
9%426%7%45%5%6%7%46%
2160
11th to 20thDay
6%425%5%345%5%6%55%
2085
21st to endDay
5%3133345%45%63%
1931
October1st to 10thDay
6%425%434446%61%
1800
11th to 20thDay
331322233474%
1800
21st to endDay
3313223345%72%
1980
November1st to 10thDay
1312223346%71%
1859
11th to 20thDay
2313324346%69%
1900
21st to endDay
25%35%43335%6%63%
1652
December1st to 10thDay
46%445%23446%60%
1520
11th to 20thDay
5%9%45%5%2445%7%49%
2058
21st to endDay
28%35%43435%6%57%
3146
January1st to 10thNight
17%48%6%3445%6%52%
4097
11th to 20thNight
25%24423245%67%
4110
21st to endNight
412%5%7%5%3445%6%44%
4521
February1st to 10thNight
27%35%423336%63%
2470
11th to 20thNight
37%35%424447%57%
2333
21st to endNight
36%35%423446%61%
1783
March1st to 10thNight
25%24423348%63%
1985
11th to 20thNight
46%34223445%63%
1980
21st to endNight
36%25%434445%61%
2178
April1st to 10thNight
2313323448%67%
1845
11th to 20thNight
3423324446%65%
1777
21st to endNight
2413413346%69%
1800
May1st to 10thNight
331222345%6%66%
1742
11th to 20thNight
332342445%7%62%
1594
21st to endNight
2212322345%74%
1746
June1st to 10thNight
4223324447%65%
1620
11th to 20thNight
3113223346%73%
1620
21st to endNight
44245%35%5%6%6%55%
1620
July1st to 10thNight
45%26%5%5%6%7%7%9%45%
1620
11th to 20thNight
4425%7%5%7%9%9%11%38%
1620
21st to endNight
6%6%47%6%5%8%9%10%12%28%
1773
August1st to 10thNight
4326%5%46%7%8%11%45%
1611
11th to 20thNight
6%5%36%7%5%8%7%8%9%37%
1708
21st to endNight
5%325%5%36%7%8%10%46%
1980
September1st to 10thNight
7%5%37%6%46%6%6%8%43%
1800
11th to 20thNight
43145%34447%59%
1871
21st to endNight
4323324446%66%
2028
October1st to 10thNight
4323424346%64%
2160
11th to 20thNight
221221333477%
2160
21st to endNight
2313223235%73%
2376
November1st to 10thNight
131221335%6%72%
2220
11th to 20thNight
2313213345%73%
2280
21st to endNight
36%24323336%63%
2497
December1st to 10thNight
47%14423446%63%
2660
11th to 20thNight
38%36%5%2345%8%52%
3159
21st to endNight
37%3442345%6%59%
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
28%49%24%25%9%
2859
11th to 20thDay
20%411%33%26%6%
2860
21st to endDay
36%5%6%18%28%7%
3146
February1st to 10thDay
25%5%9%21%26%15%
1710
11th to 20thDay
26%47%23%24%15%
1740
21st to endDay
28%46%18%27%18%
1668
March1st to 10thDay
24%47%18%31%15%
1981
11th to 20thDay
27%46%18%29%16%
1980
21st to endDay
22%5%8%20%32%13%
2178
April1st to 10thDay
20%37%18%34%18%
2114
11th to 20thDay
21%47%16%33%19%
2134
21st to endDay
19%37%20%35%15%
2160
May1st to 10thDay
20%35%16%34%21%
2215
11th to 20thDay
27%6%7%14%28%18%
2304
21st to endDay
18%46%12%34%26%
2530
June1st to 10thDay
16%47%13%30%29%
2340
11th to 20thDay
15%45%8%23%46%
2340
21st to endDay
24%6%9%12%24%25%
2340
July1st to 10thDay
35%9%10%16%13%17%
2276
11th to 20thDay
38%12%17%17%10%7%
2271
21st to endDay
43%14%19%16%6%1
2404
August1st to 10thDay
43%11%13%11%14%8%
2313
11th to 20thDay
39%9%12%17%15%7%
2192
21st to endDay
34%9%12%20%20%5%
2376
September1st to 10thDay
36%8%10%15%18%14%
2160
11th to 20thDay
27%6%8%14%24%20%
2085
21st to endDay
21%5%7%17%28%22%
1931
October1st to 10thDay
24%7%6%18%23%23%
1800
11th to 20thDay
15%3412%34%32%
1800
21st to endDay
16%37%17%41%17%
1980
November1st to 10thDay
13%37%24%34%19%
1859
11th to 20thDay
15%38%19%37%17%
1900
21st to endDay
23%46%17%32%17%
1652
December1st to 10thDay
25%39%25%25%13%
1520
11th to 20thDay
34%49%18%24%10%
2057
21st to endDay
27%5%8%20%23%18%
3146
January1st to 10thNight
27%5%12%20%26%10%
4097
11th to 20thNight
18%48%32%30%8%
4110
21st to endNight
36%6%8%18%25%8%
4521
February1st to 10thNight
23%49%22%25%17%
2470
11th to 20thNight
26%38%22%23%18%
2334
21st to endNight
21%46%19%34%15%
1783
March1st to 10thNight
19%46%23%32%17%
1985
11th to 20thNight
20%48%19%34%14%
1980
21st to endNight
23%5%7%21%31%13%
2178
April1st to 10thNight
17%28%24%33%17%
1845
11th to 20thNight
18%37%19%32%21%
1777
21st to endNight
17%47%19%37%17%
1800
May1st to 10thNight
17%5%7%16%37%19%
1742
11th to 20thNight
21%6%10%18%29%16%
1595
21st to endNight
13%48%13%37%25%
1746
June1st to 10thNight
18%5%5%15%28%29%
1620
11th to 20thNight
13%46%10%21%45%
1620
21st to endNight
24%8%10%14%17%27%
1620
July1st to 10thNight
31%11%14%14%11%18%
1575
11th to 20thNight
31%16%20%17%8%8%
1566
21st to endNight
42%17%22%12%6%1
1674
August1st to 10thNight
28%15%21%14%13%9%
1602
11th to 20thNight
38%12%17%13%11%8%
1708
21st to endNight
29%10%19%20%15%7%
1980
September1st to 10thNight
34%9%13%16%15%14%
1800
11th to 20thNight
24%6%11%16%23%21%
1871
21st to endNight
20%48%16%29%23%
2028
October1st to 10thNight
20%6%9%19%23%22%
2160
11th to 20thNight
12%45%14%34%32%
2160
21st to endNight
15%36%19%38%19%
2376
November1st to 10thNight
12%36%25%36%18%
2220
11th to 20thNight
14%36%21%36%20%
2280
21st to endNight
23%36%17%33%17%
2497
December1st to 10thNight
23%48%26%26%14%
2660
11th to 20thNight
29%5%10%19%26%12%
3159
21st to endNight
23%5%9%19%25%19%
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
7%17%35%29%10%2
270
11th to 20thDay
8%21%27%23%19%2
270
21st to endDay
212%37%28%15%5%
297
February1st to 10thDay
417%36%26%14%3
270
11th to 20thDay
7%21%34%31%8%
270
21st to endDay
10%32%27%22%7%2
323
March1st to 10thDay
6%28%27%27%11%1
421
11th to 20thDay
11%21%29%22%15%2
420
21st to endDay
11%28%35%17%8%2
462
April1st to 10thDay
5%21%36%23%10%4
420
11th to 20thDay
10%26%30%24%8%1
412
21st to endDay
9%20%36%25%10%1
420
May1st to 10thDay
5%17%37%28%11%2
423
11th to 20thDay
5%11%32%31%16%6%
448
21st to endDay
416%32%31%13%4
485
June1st to 10thDay
5%7%26%33%25%5%
450
11th to 20thDay
39%26%30%22%10%
450
21st to endDay
26%27%35%22%9%
450
July1st to 10thDay
6%112%36%32%13%
446
11th to 20thDay
8%16%26%33%26%
444
21st to endDay
8%7%21%35%29%
487
August1st to 10thDay
8%210%29%34%18%
447
11th to 20thDay
8%211%31%30%18%
437
21st to endDay
7%211%30%31%19%
495
September1st to 10thDay
10%316%27%32%13%
450
11th to 20thDay
5%220%37%27%9%
450
21st to endDay
6%5%24%28%25%10%
401
October1st to 10thDay
410%26%27%20%13%
270
11th to 20thDay
7%8%22%30%23%10%
270
21st to endDay
6%12%19%27%30%7%
297
November1st to 10thDay
314%27%35%19%2
270
11th to 20thDay
49%19%37%24%7%
270
21st to endDay
417%31%26%16%6%
270
December1st to 10thDay
7%14%21%36%19%3
270
11th to 20thDay
7%16%32%27%14%3
270
21st to endDay
11%20%32%24%11%1
297
January1st to 10thNight
49%29%35%18%3
760
11th to 20thNight
7%9%31%36%15%2
760
21st to endNight
6%12%30%32%18%3
836
February1st to 10thNight
411%36%33%14%2
760
11th to 20thNight
5%11%40%33%10%1
744
21st to endNight
5%15%42%30%7%
628
March1st to 10thNight
216%37%31%13%1
722
11th to 20thNight
5%13%29%35%18%1
720
21st to endNight
413%37%34%12%1
792
April1st to 10thNight
313%41%33%9%1
585
11th to 20thNight
5%15%39%32%9%1
533
21st to endNight
313%41%32%10%1
540
May1st to 10thNight
39%38%39%11%1
540
11th to 20thNight
37%31%42%15%2
531
21st to endNight
27%35%40%15%1
584
June1st to 10thNight
4427%48%15%1
540
11th to 20thNight
3429%47%16%1
540
21st to endNight
3318%46%27%2
540
July1st to 10thNight
4112%42%38%3
525
11th to 20thNight
5%5%32%49%8%
522
21st to endNight
6%27%26%49%11%
591
August1st to 10thNight
41429%51%10%
537
11th to 20thNight
6%18%34%45%7%
534
21st to endNight
5%17%32%48%7%
594
September1st to 10thNight
8%18%39%40%3
540
11th to 20thNight
3211%44%35%4
611
21st to endNight
45%18%39%29%6%
720
October1st to 10thNight
5%330%39%21%2
720
11th to 20thNight
25%21%45%22%3
720
21st to endNight
37%25%36%25%4
792
November1st to 10thNight
27%25%38%24%4
740
11th to 20thNight
28%24%38%24%4
760
21st to endNight
6%13%25%30%23%3
863
December1st to 10thNight
7%10%25%38%17%2
950
11th to 20thNight
7%12%34%29%17%1
877
21st to endNight
6%14%33%34%11%2
836
Page generated at 2024-02-27 04:30:16. Version ac07

Copyright © 2024 Attilla Danko.


Celescina Ramah New Mexico Observatory Clear Sky Chart |Charts Home