Dark Sky New Mexico
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dark Sky New Mexico clear sky chart from 2005-11-05 to 2017-12-20.

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
69%
15715
35%
47991
27%
15674
77%
15674
50%
23370

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
66%
718
33%
2327
31%
716
73%
716
48%
1122
January16th to endNight
63%
768
37%
2496
32%
768
75%
768
46%
1215
February1st to 15thNight
66%
699
36%
2277
31%
696
77%
696
55%
985
February16th to endNight
57%
632
43%
1753
30%
632
70%
632
59%
845
March1st to 15thNight
57%
720
40%
1980
26%
720
69%
720
59%
955
March16th to endNight
65%
768
40%
2112
23%
768
77%
768
62%
978
April1st to 15thNight
55%
605
36%
1864
21%
605
72%
605
55%
831
April16th to endNight
55%
540
43%
1800
29%
540
77%
540
64%
692
May1st to 15thNight
60%
539
36%
1754
26%
539
74%
539
63%
700
May16th to endNight
65%
561
38%
1684
29%
561
74%
561
62%
735
June1st to 15thNight
77%
540
34%
1620
29%
540
81%
540
66%
690
June16th to endNight
80%
540
25%
1620
23%
540
81%
540
49%
813
July1st to 15thNight
77%
510
17%
1530
15%
510
78%
510
28%
953
July16th to endNight
78%
564
12%
1593
11%
531
77%
531
22%
1090
August1st to 15thNight
79%
539
19%
1650
19%
536
79%
536
29%
1025
August16th to endNight
77%
573
22%
1910
23%
573
78%
573
28%
1159
September1st to 15thNight
75%
588
23%
1848
23%
588
75%
588
31%
1131
September16th to endNight
75%
716
38%
1986
28%
716
80%
716
55%
1006
October1st to 15thNight
76%
720
36%
2160
28%
720
81%
720
61%
986
October16th to endNight
81%
768
43%
2304
34%
768
87%
768
68%
969
November1st to 15thNight
75%
760
42%
2280
33%
760
82%
760
65%
979
November16th to endNight
67%
780
44%
2350
34%
780
76%
780
55%
1097
December1st to 15thNight
67%
780
38%
2535
33%
780
75%
780
50%
1170
December16th to endNight
61%
787
36%
2558
32%
787
70%
787
45%
1244

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
321232445%6%63%
48836
Night
2212323446%64%
48198
TransparencyDay
20%47%14%26%26%
48531
Night
19%47%15%28%25%
48004
SeeingDay
5%8%20%30%24%9%
5535
Night
3318%40%30%3
15725

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
22123235%48%63%
1611
16th to endDay
4423213347%61%
1728
February1st to 15thDay
222213245%70%
1575
16th to endDay
3212213345%69%
1718
March1st to 15thDay
1212213437%68%
1980
16th to endDay
221221224473%
2112
April1st to 15thDay
211212246%72%
2082
16th to endDay
11111122382%
2160
May1st to 15thDay
112213335%75%
2193
16th to endDay
111212235%76%
2429
June1st to 15thDay
211212236%73%
2340
16th to endDay
221242445%7%62%
2340
July1st to 15thDay
43145%5%7%7%8%11%41%
2340
16th to endDay
7%435%6%48%7%8%10%32%
2467
August1st to 15thDay
5%5%15%5%46%7%8%11%37%
2301
16th to endDay
5%4245%36%7%7%10%42%
2292
September1st to 15thDay
6%4247%47%5%6%7%45%
2109
16th to endDay
42231335%6%65%
1974
October1st to 15thDay
122312346%71%
1800
16th to endDay
111121223477%
1920
November1st to 15thDay
12212246%74%
1909
16th to endDay
321231223471%
1937
December1st to 15thDay
3213313446%64%
1755
16th to endDay
341331335%5%63%
1764
January1st to 15thNight
4313212346%65%
2327
16th to endNight
4213223345%63%
2496
February1st to 15thNight
1212223345%70%
2277
16th to endNight
1212213235%70%
1753
March1st to 15thNight
3212212346%70%
1980
16th to endNight
11121323476%
2112
April1st to 15thNight
211313345%69%
1864
16th to endNight
11111122481%
1800
May1st to 15thNight
112212335%75%
1754
16th to endNight
21221233476%
1684
June1st to 15thNight
2112111345%75%
1620
16th to endNight
1112325%5%7%8%59%
1620
July1st to 15thNight
23135%49%9%9%11%37%
1620
16th to endNight
33246%410%11%11%13%27%
1701
August1st to 15thNight
33146%37%7%9%11%40%
1659
16th to endNight
43146%45%7%8%10%42%
1910
September1st to 15thNight
5%425%5%36%6%7%10%42%
1848
16th to endNight
3312312335%69%
1986
October1st to 15thNight
1112313345%72%
2160
16th to endNight
11111223478%
2304
November1st to 15thNight
111112327%75%
2280
16th to endNight
3212222225%71%
2350
December1st to 15thNight
3312213346%65%
2535
16th to endNight
3313324345%64%
2558

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
18%47%17%33%17%
1612
16th to endDay
23%3415%33%18%
1728
February1st to 15thDay
16%25%14%30%30%
1575
16th to endDay
17%25%13%34%27%
1718
March1st to 15thDay
16%2411%34%30%
1980
16th to endDay
15%1411%33%35%
2112
April1st to 15thDay
12%2310%36%34%
2082
16th to endDay
10%27%25%53%
2160
May1st to 15thDay
12%248%26%45%
2193
16th to endDay
12%249%25%46%
2432
June1st to 15thDay
12%237%21%52%
2340
16th to endDay
20%37%10%21%36%
2340
July1st to 15thDay
30%9%16%17%13%11%
2201
16th to endDay
39%13%18%19%8%1
2312
August1st to 15thDay
36%10%16%19%13%4
2286
16th to endDay
33%9%14%15%16%10%
2292
September1st to 15thDay
34%7%11%16%17%11%
2109
16th to endDay
19%35%16%33%21%
1974
October1st to 15thDay
15%36%16%27%31%
1800
16th to endDay
11%2417%32%31%
1920
November1st to 15thDay
12%15%19%34%25%
1909
16th to endDay
17%2315%34%26%
1937
December1st to 15thDay
20%26%21%33%15%
1755
16th to endDay
22%38%22%31%11%
1764
January1st to 15thNight
20%46%17%32%18%
2327
16th to endNight
22%3419%33%17%
2496
February1st to 15thNight
15%2416%31%28%
2288
16th to endNight
16%25%15%34%26%
1753
March1st to 15thNight
15%2413%33%31%
1980
16th to endNight
13%1410%37%32%
2112
April1st to 15thNight
15%1411%35%31%
1864
16th to endNight
9%237%30%46%
1800
May1st to 15thNight
11%149%27%45%
1755
16th to endNight
13%25%11%26%41%
1685
June1st to 15thNight
12%147%23%50%
1620
16th to endNight
20%5%7%13%19%34%
1620
July1st to 15thNight
29%14%15%18%12%9%
1530
16th to endNight
36%16%22%17%5%1
1593
August1st to 15thNight
32%11%18%19%14%4
1650
16th to endNight
31%11%15%17%14%8%
1910
September1st to 15thNight
32%8%14%15%16%11%
1848
16th to endNight
18%35%16%36%18%
1986
October1st to 15thNight
14%38%15%26%32%
2160
16th to endNight
10%2316%30%36%
2304
November1st to 15thNight
11%2420%34%26%
2280
16th to endNight
18%2312%33%29%
2350
December1st to 15thNight
19%26%22%32%16%
2535
16th to endNight
21%48%22%32%12%
2558

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
7%8%25%43%13%1
90
16th to endDay
6%9%19%35%21%7%
96
February1st to 15thDay
8%412%35%33%5%
90
16th to endDay
10%21%31%20%15%1
219
March1st to 15thDay
6%17%30%25%15%5%
270
16th to endDay
8%18%28%28%10%6%
288
April1st to 15thDay
7%19%28%29%11%3
269
16th to endDay
324%32%27%9%2
270
May1st to 15thDay
419%37%23%12%3
288
16th to endDay
49%34%34%16%1
330
June1st to 15thDay
5%225%38%18%9%
315
16th to endDay
5%11%38%30%12%
315
July1st to 15thDay
47%36%39%10%
305
16th to endDay
6%8%25%35%24%
327
August1st to 15thDay
5%16%28%35%22%
315
16th to endDay
5%1427%43%18%
332
September1st to 15thDay
9%9%35%34%10%
315
16th to endDay
6%6%19%31%28%7%
309
October1st to 15thDay
216%31%28%19%
135
16th to endDay
215%25%36%20%
144
November1st to 15thDay
28%21%31%24%11%
135
16th to endDay
6%11%20%32%21%8%
135
December1st to 15thDay
6%10%20%26%27%8%
135
16th to endDay
8%15%29%34%12%
108
January1st to 15thNight
5%320%44%23%2
720
16th to endNight
5%5%21%42%23%1
768
February1st to 15thNight
36%20%41%24%3
704
16th to endNight
26%31%45%14%
632
March1st to 15thNight
36%29%39%17%2
720
16th to endNight
25%24%43%22%2
768
April1st to 15thNight
38%30%42%13%1
605
16th to endNight
28%32%40%15%1
540
May1st to 15thNight
25%29%44%17%1
540
16th to endNight
2324%47%20%
563
June1st to 15thNight
2113%55%25%
540
16th to endNight
118%49%37%1
540
July1st to 15thNight
46%37%46%4
510
16th to endNight
5%328%55%7%
564
August1st to 15thNight
4322%56%12%
539
16th to endNight
5%424%56%9%
573
September1st to 15thNight
6%16%30%51%4
588
16th to endNight
5%13%37%38%4
716
October1st to 15thNight
116%44%33%3
720
16th to endNight
2112%40%36%6%
768
November1st to 15thNight
1218%40%31%5%
760
16th to endNight
4221%37%30%3
780
December1st to 15thNight
5%219%42%25%3
780
16th to endNight
45%22%41%21%3
787
Page generated at 2017-12-21 05:04:53. Version ac04

Copyright 2017 A. Danko


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