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 2017-04-01.

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
68%
14829
35%
45268
27%
14788
76%
14788
50%
22025

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
54%
559
38%
1720
22%
559
72%
559
54%
778
April16th to endNight
55%
495
41%
1650
27%
495
75%
495
63%
643
May1st to 15thNight
59%
494
37%
1608
27%
494
74%
494
62%
644
May16th to endNight
65%
513
37%
1540
28%
513
74%
513
61%
673
June1st to 15thNight
78%
495
36%
1485
31%
495
82%
495
68%
622
June16th to endNight
79%
495
23%
1485
21%
495
80%
495
49%
751
July1st to 15thNight
77%
465
18%
1395
15%
465
78%
465
29%
872
July16th to endNight
78%
522
13%
1467
12%
489
78%
489
22%
998
August1st to 15thNight
79%
494
20%
1512
21%
491
79%
491
30%
929
August16th to endNight
77%
525
20%
1750
21%
525
78%
525
27%
1072
September1st to 15thNight
74%
539
23%
1694
23%
539
75%
539
30%
1054
September16th to endNight
76%
656
36%
1820
27%
656
80%
656
55%
922
October1st to 15thNight
75%
660
37%
1980
29%
660
81%
660
59%
915
October16th to endNight
82%
704
42%
2112
33%
704
87%
704
69%
882
November1st to 15thNight
74%
700
43%
2100
33%
700
82%
700
66%
892
November16th to endNight
65%
720
43%
2169
32%
720
75%
720
54%
1023
December1st to 15thNight
68%
720
39%
2340
34%
720
76%
720
52%
1051
December16th to endNight
61%
768
36%
2496
32%
768
70%
768
46%
1204

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
321232345%6%63%
45822
Night
2212323446%65%
45475
TransparencyDay
20%47%14%26%26%
45517
Night
19%47%15%28%25%
45281
SeeingDay
6%9%21%31%23%8%
4574
Night
3318%40%29%3
14839

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
21121225%6%73%
1911
16th to endDay
21111122381%
1980
May1st to 15thDay
112213335%75%
2009
16th to endDay
111212235%76%
2221
June1st to 15thDay
211212246%73%
2145
16th to endDay
221242445%7%61%
2145
July1st to 15thDay
43145%5%7%7%8%11%40%
2145
16th to endDay
7%435%6%47%7%8%10%33%
2285
August1st to 15thDay
6%5%15%6%47%7%8%11%36%
2109
16th to endDay
5%4246%36%7%7%10%41%
2100
September1st to 15thDay
6%4247%47%6%6%7%43%
1933
16th to endDay
42232335%6%65%
1810
October1st to 15thDay
122312346%70%
1650
16th to endDay
111121223477%
1760
November1st to 15thDay
12112236%76%
1759
16th to endDay
321231223470%
1788
December1st to 15thDay
3213313446%66%
1620
16th to endDay
341331335%5%64%
1728
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
221323345%69%
1720
16th to endNight
11111122480%
1650
May1st to 15thNight
112212335%75%
1608
16th to endNight
21221233475%
1540
June1st to 15thNight
21111245%76%
1485
16th to endNight
1123425%5%7%8%58%
1485
July1st to 15thNight
33145%49%9%9%11%37%
1485
16th to endNight
43246%410%11%11%13%28%
1575
August1st to 15thNight
32146%37%6%9%12%40%
1521
16th to endNight
43246%45%7%9%10%41%
1750
September1st to 15thNight
6%415%6%36%6%8%10%41%
1694
16th to endNight
4312312335%68%
1820
October1st to 15thNight
1112313246%70%
1980
16th to endNight
111112235%78%
2112
November1st to 15thNight
111112326%77%
2100
16th to endNight
3212222225%70%
2169
December1st to 15thNight
3312213346%66%
2340
16th to endNight
3312324345%64%
2496

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%
1911
16th to endDay
10%26%26%52%
1980
May1st to 15thDay
12%248%26%45%
2009
16th to endDay
12%249%25%45%
2224
June1st to 15thDay
12%236%21%53%
2145
16th to endDay
21%37%10%21%36%
2145
July1st to 15thDay
31%9%16%18%13%10%
2006
16th to endDay
38%12%17%20%9%1
2130
August1st to 15thDay
36%10%16%18%13%3
2094
16th to endDay
34%9%15%16%14%9%
2100
September1st to 15thDay
36%7%12%16%16%10%
1933
16th to endDay
20%35%15%34%20%
1810
October1st to 15thDay
15%36%16%26%31%
1650
16th to endDay
11%2417%31%31%
1760
November1st to 15thDay
11%15%17%35%28%
1759
16th to endDay
18%2316%34%25%
1788
December1st to 15thDay
17%26%22%33%16%
1620
16th to endDay
21%38%22%31%11%
1728
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
16%1412%35%29%
1720
16th to endNight
10%237%30%46%
1650
May1st to 15thNight
11%149%27%45%
1609
16th to endNight
13%25%12%26%40%
1541
June1st to 15thNight
11%147%23%52%
1485
16th to endNight
20%5%7%13%20%32%
1485
July1st to 15thNight
30%14%16%18%12%8%
1395
16th to endNight
36%16%22%18%5%1
1467
August1st to 15thNight
31%11%18%20%14%3
1512
16th to endNight
32%12%16%17%13%8%
1750
September1st to 15thNight
33%9%15%16%15%9%
1694
16th to endNight
18%35%17%36%18%
1820
October1st to 15thNight
15%38%16%26%30%
1980
16th to endNight
10%1416%29%37%
2112
November1st to 15thNight
10%2318%36%28%
2100
16th to endNight
18%2313%31%29%
2169
December1st to 15thNight
17%27%22%32%17%
2340
16th to endNight
20%38%22%31%12%
2496

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
8%21%29%29%9%1
211
16th to endDay
424%34%24%9%2
210
May1st to 15thDay
321%40%24%7%2
228
16th to endDay
49%35%33%16%1
266
June1st to 15thDay
5%325%41%14%7%
255
16th to endDay
5%112%42%29%9%
255
July1st to 15thDay
6%16%40%37%8%
245
16th to endDay
6%9%27%36%19%
271
August1st to 15thDay
415%31%33%23%
255
16th to endDay
415%29%43%14%
268
September1st to 15thDay
11%10%34%33%9%
255
16th to endDay
7%6%17%31%30%8%
250
October1st to 15thDay
1318%26%28%21%
90
16th to endDay
4112%27%40%14%
96
November1st to 15thDay
312%27%23%20%13%
90
16th to endDay
7%16%27%31%14%2
90
December1st to 15thDay
311%17%24%32%11%
90
16th to endDay
8%16%30%32%12%
96
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%31%42%12%1
559
16th to endNight
27%32%40%14%2
495
May1st to 15thNight
26%29%44%16%1
495
16th to endNight
2324%47%21%
515
June1st to 15thNight
2113%55%25%1
495
16th to endNight
118%49%36%1
495
July1st to 15thNight
45%36%47%4
465
16th to endNight
5%329%54%7%
522
August1st to 15thNight
4323%55%13%
494
16th to endNight
5%425%56%8%
525
September1st to 15thNight
6%17%30%50%4
539
16th to endNight
5%112%36%39%5%
656
October1st to 15thNight
116%44%32%3
660
16th to endNight
2112%42%35%6%
704
November1st to 15thNight
1220%39%30%6%
700
16th to endNight
4222%38%28%3
720
December1st to 15thNight
5%319%41%26%3
720
16th to endNight
45%23%41%21%3
768
Page generated at 2017-04-02 05:39:03. Version ac04

Copyright 2017 A. Danko


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