New Mexico Skies
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Mexico Skies clear sky chart from 2005-11-06 to 2025-11-03.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	3 3 1 4 3 4 4 4 6% 7% 60%	134176
	Night	2 3 1 3 2 3 3 3 5% 8% 67%	133306
Transparency	Day	21% 5% 9% 17% 25% 24%	129264
	Night	17% 4 9% 18% 27% 26%	129222
Seeing	Day	12% 16% 27% 25% 16% 4	16081
	Night	10% 15% 27% 29% 17% 3	26232

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	1 5% 2 3 2 2 3 4 5% 6% 68%	4098
	11th to 20th	Day	1 2 4 1 1 2 2 4 6% 77%	4100
	21st to end	Day	2 3 1 4 2 2 3 3 5% 7% 68%	4510
February	1st to 10th	Day	1 3 2 4 2 3 3 3 4 6% 70%	1985
	11th to 20th	Day	2 3 1 4 3 3 3 2 4 6% 69%	1949
	21st to end	Day	1 2 1 3 3 3 2 2 3 6% 74%	1650
March	1st to 10th	Day	1 5% 2 3 2 3 3 2 3 7% 68%	4684
	11th to 20th	Day	3 7% 1 3 3 3 3 3 4 7% 66%	5000
	21st to end	Day	1 3 1 3 3 4 4 3 6% 8% 65%	5719
April	1st to 10th	Day	1 3 1 3 2 3 3 2 4 6% 72%	2400
	11th to 20th	Day	3 3 1 2 2 2 3 2 5% 5% 71%	2371
	21st to end	Day	2 2 1 2 2 2 2 2 3 4 78%	2400
May	1st to 10th	Day	2 2 1 3 2 3 3 2 4 7% 72%	5440
	11th to 20th	Day	3 2 1 2 2 3 4 3 4 6% 69%	5405
	21st to end	Day	1 1 2 2 2 3 3 5% 7% 75%	6341
June	1st to 10th	Day	2 2 1 3 4 4 5% 5% 8% 9% 58%	2800
	11th to 20th	Day	2 2 1 3 2 3 4 4 6% 8% 66%	2800
	21st to end	Day	8% 4 1 5% 5% 5% 7% 6% 9% 8% 42%	2779
July	1st to 10th	Day	8% 4 2 7% 6% 7% 7% 6% 8% 9% 37%	5879
	11th to 20th	Day	3 2 1 5% 5% 6% 8% 7% 10% 10% 42%	5880
	21st to end	Day	6% 4 2 8% 7% 8% 9% 7% 10% 10% 29%	6320
August	1st to 10th	Day	4 3 2 6% 5% 6% 8% 6% 8% 10% 43%	5348
	11th to 20th	Day	5% 3 2 8% 6% 7% 7% 7% 9% 9% 39%	5366
	21st to end	Day	7% 4 2 7% 6% 7% 7% 6% 8% 9% 40%	5984
September	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 7% 8% 43%	2400
	11th to 20th	Day	8% 4 2 7% 4 4 4 4 5% 7% 50%	2387
	21st to end	Day	5% 4 1 4 3 3 3 3 3 6% 64%	2200
October	1st to 10th	Day	5% 3 1 3 3 3 3 3 4 5% 68%	3317
	11th to 20th	Day	4 4 1 3 2 2 4 3 4 5% 67%	3250
	21st to end	Day	1 1 2 1 1 1 1 2 3 86%	3548
November	1st to 10th	Day	2 2 1 1 2 2 2 2 4 4 77%	1979
	11th to 20th	Day	2 1 3 2 2 2 2 5% 8% 72%	1805
	21st to end	Day	3 3 1 2 2 3 3 3 5% 7% 67%	1800
December	1st to 10th	Day	3 5% 1 4 2 2 3 2 4 6% 66%	2940
	11th to 20th	Day	1 2 1 4 3 3 3 3 4 8% 69%	3132
	21st to end	Day	2 1 2 2 2 2 2 5% 6% 76%	4210
January	1st to 10th	Night	1 5% 2 5% 2 3 3 3 4 6% 67%	5867
	11th to 20th	Night	1 2 1 3 2 2 2 2 3 5% 77%	5880
	21st to end	Night	1 3 1 3 3 2 2 3 5% 8% 67%	6468
February	1st to 10th	Night	2 1 3 2 2 3 3 5% 7% 71%	2412
	11th to 20th	Night	2 3 1 2 2 2 3 2 5% 6% 72%	2338
	21st to end	Night	1 2 1 2 1 2 2 2 5% 7% 75%	1980
March	1st to 10th	Night	2 1 3 1 1 3 2 4 7% 76%	5181
	11th to 20th	Night	3 10% 2 3 2 2 2 2 3 6% 67%	5000
	21st to end	Night	1 1 2 2 2 3 3 5% 8% 74%	5243
April	1st to 10th	Night	2 2 1 2 2 2 2 3 6% 7% 70%	2000
	11th to 20th	Night	2 2 1 2 2 2 2 3 4 7% 74%	1977
	21st to end	Night	1 2 1 2 2 2 2 2 3 6% 77%	2000
May	1st to 10th	Night	3 4 1 2 2 2 3 2 4 5% 71%	4540
	11th to 20th	Night	2 2 1 2 2 2 3 2 3 5% 74%	4510
	21st to end	Night	2 1 1 1 1 2 2 2 3 4 80%	4533
June	1st to 10th	Night	2 3 1 4 4 4 4 4 6% 9% 59%	1600
	11th to 20th	Night	2 2 1 2 2 2 3 3 4 7% 72%	1600
	21st to end	Night	6% 4 2 5% 4 5% 6% 5% 6% 9% 48%	1612
July	1st to 10th	Night	10% 5% 1 4 3 3 4 4 6% 10% 49%	4100
	11th to 20th	Night	2 3 1 4 3 4 6% 5% 9% 12% 51%	4100
	21st to end	Night	5% 5% 1 4 4 5% 5% 5% 11% 16% 40%	4548
August	1st to 10th	Night	2 2 1 3 3 4 4 4 8% 14% 54%	4464
	11th to 20th	Night	3 3 1 4 3 4 4 5% 8% 15% 50%	4483
	21st to end	Night	4 3 1 4 3 4 5% 5% 7% 13% 52%	4993
September	1st to 10th	Night	7% 4 2 5% 3 3 5% 4 7% 8% 52%	2000
	11th to 20th	Night	7% 3 1 3 3 2 4 3 5% 8% 60%	2011
	21st to end	Night	6% 3 1 2 2 2 3 2 4 7% 67%	2200
October	1st to 10th	Night	3 2 2 2 2 2 1 3 5% 77%	3854
	11th to 20th	Night	3 3 1 3 2 3 3 3 4 5% 70%	3898
	21st to end	Night	2 1 1 2 1 1 2 1 2 5% 82%	4252
November	1st to 10th	Night	3 3 1 2 2 2 2 2 3 6% 74%	2364
	11th to 20th	Night	1 1 1 2 2 3 3 3 4 7% 73%	2570
	21st to end	Night	2 5% 1 3 3 3 3 3 4 6% 67%	2600
December	1st to 10th	Night	2 6% 2 3 2 2 3 3 4 7% 67%	4250
	11th to 20th	Night	1 2 1 2 3 3 4 3 5% 7% 70%	5070
	21st to end	Night	1 3 1 3 2 2 2 2 4 6% 74%	6808

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	17% 3 3 18% 30% 28%	4099
	11th to 20th	Day	11% 2 5% 16% 37% 29%	4100
	21st to end	Day	17% 1 9% 15% 30% 28%	4510
February	1st to 10th	Day	15% 4 5% 17% 29% 29%	1985
	11th to 20th	Day	18% 4 5% 19% 27% 27%	1959
	21st to end	Day	14% 1 6% 12% 29% 38%	1650
March	1st to 10th	Day	18% 3 4 8% 19% 48%	4684
	11th to 20th	Day	16% 7% 5% 10% 30% 33%	5000
	21st to end	Day	17% 3 6% 18% 30% 26%	5719
April	1st to 10th	Day	15% 3 5% 17% 35% 26%	2400
	11th to 20th	Day	16% 2 4 14% 30% 34%	2374
	21st to end	Day	12% 2 5% 17% 34% 30%	2400
May	1st to 10th	Day	14% 3 5% 17% 26% 36%	5440
	11th to 20th	Day	14% 6% 4 14% 23% 38%	5408
	21st to end	Day	9% 4 7% 11% 17% 51%	6342
June	1st to 10th	Day	19% 6% 11% 20% 24% 20%	2800
	11th to 20th	Day	15% 4 6% 16% 24% 36%	2800
	21st to end	Day	33% 8% 12% 16% 18% 13%	2779
July	1st to 10th	Day	38% 10% 14% 18% 13% 7%	5816
	11th to 20th	Day	30% 11% 18% 21% 17% 4	5811
	21st to end	Day	41% 11% 20% 18% 9% 1	6137
August	1st to 10th	Day	30% 8% 12% 32% 15% 3	3892
	11th to 20th	Day	33% 7% 14% 21% 23% 2	3882
	21st to end	Day	36% 10% 18% 25% 10% 1	4311
September	1st to 10th	Day	36% 6% 13% 17% 18% 10%	2400
	11th to 20th	Day	34% 5% 8% 18% 26% 9%	2387
	21st to end	Day	22% 3 7% 23% 31% 13%	2200
October	1st to 10th	Day	20% 2 7% 11% 31% 29%	3317
	11th to 20th	Day	18% 3 9% 18% 29% 23%	3250
	21st to end	Day	8% 1 2 14% 40% 34%	3548
November	1st to 10th	Day	12% 2 4 22% 34% 25%	1979
	11th to 20th	Day	14% 1 7% 21% 31% 26%	1805
	21st to end	Day	17% 4 8% 17% 26% 27%	1800
December	1st to 10th	Day	20% 2 5% 18% 31% 24%	2940
	11th to 20th	Day	16% 2 7% 14% 35% 26%	3130
	21st to end	Day	11% 2 6% 14% 36% 31%	4210
January	1st to 10th	Night	20% 2 5% 14% 35% 24%	5867
	11th to 20th	Night	12% 2 6% 12% 34% 33%	5880
	21st to end	Night	16% 2 8% 16% 28% 28%	6468
February	1st to 10th	Night	13% 3 8% 18% 26% 32%	2412
	11th to 20th	Night	14% 4 7% 18% 31% 27%	2338
	21st to end	Night	11% 1 9% 15% 28% 36%	1980
March	1st to 10th	Night	11% 2 4 10% 28% 44%	5181
	11th to 20th	Night	19% 5% 4 10% 30% 31%	5000
	21st to end	Night	11% 2 6% 21% 35% 25%	5243
April	1st to 10th	Night	12% 3 6% 18% 36% 26%	2000
	11th to 20th	Night	11% 2 7% 17% 31% 32%	1977
	21st to end	Night	11% 4 5% 18% 34% 29%	2000
May	1st to 10th	Night	14% 4 4 17% 21% 39%	4537
	11th to 20th	Night	14% 2 6% 17% 28% 33%	4511
	21st to end	Night	9% 2 5% 10% 15% 58%	4534
June	1st to 10th	Night	20% 6% 10% 19% 23% 22%	1600
	11th to 20th	Night	14% 2 5% 17% 22% 39%	1600
	21st to end	Night	31% 5% 15% 18% 14% 16%	1612
July	1st to 10th	Night	30% 7% 18% 27% 14% 5%	4055
	11th to 20th	Night	22% 8% 22% 30% 16% 3	4046
	21st to end	Night	28% 9% 29% 23% 11% 1	4419
August	1st to 10th	Night	21% 6% 19% 34% 17% 3	3244
	11th to 20th	Night	20% 5% 17% 29% 26% 2	3243
	21st to end	Night	26% 8% 22% 27% 15% 1	3597
September	1st to 10th	Night	29% 5% 16% 18% 20% 12%	2000
	11th to 20th	Night	23% 6% 13% 20% 27% 12%	2011
	21st to end	Night	19% 3 10% 22% 32% 13%	2200
October	1st to 10th	Night	13% 2 6% 11% 34% 33%	3854
	11th to 20th	Night	17% 3 8% 14% 32% 25%	3898
	21st to end	Night	9% 2 3 14% 37% 35%	4252
November	1st to 10th	Night	14% 2 4 19% 32% 29%	2364
	11th to 20th	Night	12% 4 5% 21% 31% 28%	2570
	21st to end	Night	20% 3 7% 18% 29% 24%	2600
December	1st to 10th	Night	19% 2 7% 18% 32% 21%	4250
	11th to 20th	Night	15% 1 7% 16% 29% 32%	5071
	21st to end	Night	13% 2 5% 17% 31% 32%	6808

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	16% 26% 36% 18% 4 1	300
	11th to 20th	Day	21% 22% 31% 18% 6% 1	300
	21st to end	Day	14% 25% 29% 21% 9% 1	330
February	1st to 10th	Day	19% 25% 28% 21% 6% 1	300
	11th to 20th	Day	24% 24% 33% 15% 3 1	300
	21st to end	Day	30% 29% 26% 10% 4 1	249
March	1st to 10th	Day	23% 28% 33% 12% 4	380
	11th to 20th	Day	26% 25% 31% 12% 6% 1	500
	21st to end	Day	24% 30% 33% 9% 3 1	550
April	1st to 10th	Day	16% 31% 36% 13% 3 1	500
	11th to 20th	Day	18% 34% 31% 14% 3	492
	21st to end	Day	16% 31% 34% 15% 3	500
May	1st to 10th	Day	8% 30% 40% 19% 3	503
	11th to 20th	Day	12% 22% 36% 21% 7% 2	528
	21st to end	Day	7% 17% 43% 23% 8% 1	692
June	1st to 10th	Day	3 9% 33% 34% 18% 3	730
	11th to 20th	Day	3 8% 31% 39% 15% 4	730
	21st to end	Day	9% 4 19% 34% 28% 6%	709
July	1st to 10th	Day	8% 2 14% 36% 32% 10%	526
	11th to 20th	Day	4 2 8% 38% 36% 12%	524
	21st to end	Day	5% 1 7% 32% 40% 15%	575
August	1st to 10th	Day	5% 2 8% 31% 38% 15%	527
	11th to 20th	Day	9% 2 11% 34% 33% 11%	517
	21st to end	Day	9% 3 9% 36% 32% 11%	583
September	1st to 10th	Day	11% 3 18% 38% 23% 6%	530
	11th to 20th	Day	6% 5% 20% 43% 21% 5%	517
	21st to end	Day	6% 7% 31% 32% 20% 4	330
October	1st to 10th	Day	11% 11% 26% 32% 15% 5%	330
	11th to 20th	Day	14% 11% 34% 21% 17% 4	330
	21st to end	Day	12% 17% 31% 24% 10% 6%	363
November	1st to 10th	Day	17% 23% 31% 17% 11% 2	306
	11th to 20th	Day	14% 16% 31% 20% 15% 4	300
	21st to end	Day	18% 26% 28% 16% 11% 1	300
December	1st to 10th	Day	19% 21% 30% 23% 7% 1	300
	11th to 20th	Day	17% 24% 31% 23% 5%	300
	21st to end	Day	24% 26% 32% 14% 5%	330
January	1st to 10th	Night	9% 22% 32% 23% 11% 3	800
	11th to 20th	Night	11% 23% 31% 24% 9% 3	800
	21st to end	Night	12% 22% 29% 25% 10% 2	880
February	1st to 10th	Night	10% 24% 35% 20% 8% 3	800
	11th to 20th	Night	14% 21% 41% 19% 4 1	784
	21st to end	Night	17% 29% 36% 15% 3 1	660
March	1st to 10th	Night	15% 27% 30% 22% 6% 1	800
	11th to 20th	Night	15% 20% 30% 25% 9% 1	800
	21st to end	Night	12% 25% 37% 19% 6%	776
April	1st to 10th	Night	12% 23% 43% 18% 5%	600
	11th to 20th	Night	12% 23% 37% 24% 5%	593
	21st to end	Night	9% 24% 35% 27% 6%	600
May	1st to 10th	Night	5% 19% 43% 29% 4	600
	11th to 20th	Night	9% 14% 31% 34% 10% 2	591
	21st to end	Night	6% 12% 38% 33% 10%	650
June	1st to 10th	Night	3 5% 30% 45% 17% 1	600
	11th to 20th	Night	4 5% 31% 42% 17% 2	600
	21st to end	Night	6% 3 18% 43% 28% 2	600
July	1st to 10th	Night	8% 2 7% 40% 41% 3	585
	11th to 20th	Night	4 1 5% 36% 45% 8%	582
	21st to end	Night	6% 2 4 29% 49% 10%	657
August	1st to 10th	Night	6% 1 3 31% 47% 12%	597
	11th to 20th	Night	5% 2 5% 33% 43% 13%	594
	21st to end	Night	5% 1 7% 30% 50% 9%	660
September	1st to 10th	Night	7% 3 8% 38% 37% 7%	600
	11th to 20th	Night	9% 1 12% 44% 30% 4	600
	21st to end	Night	7% 4 15% 45% 26% 3	600
October	1st to 10th	Night	7% 8% 23% 40% 19% 3	760
	11th to 20th	Night	9% 10% 28% 35% 16% 3	800
	21st to end	Night	9% 13% 28% 29% 16% 6%	880
November	1st to 10th	Night	9% 14% 30% 28% 14% 5%	788
	11th to 20th	Night	7% 14% 29% 34% 13% 3	970
	21st to end	Night	12% 20% 29% 23% 13% 3	1000
December	1st to 10th	Night	13% 19% 28% 28% 10% 2	1000
	11th to 20th	Night	12% 24% 31% 24% 9% 1	1000
	21st to end	Night	16% 24% 31% 22% 5% 2	1025

Page generated at 2025-10-31 00:02:40. Version ac07

Copyright © 2025 Attilla Danko.