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 2024-11-06.

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%	104377
	Night	3 3 1 3 2 3 3 3 5% 8% 67%	103367
Transparency	Day	21% 5% 9% 18% 25% 22%	104143
	Night	17% 4 9% 19% 27% 23%	103191
Seeing	Day	12% 16% 27% 26% 16% 4	14763
	Night	9% 15% 26% 29% 17% 3	24932

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 3 1 3 2 2 3 4 5% 6% 71%	2858
	11th to 20th	Day	1 1 2 2 2 2 2 4 6% 77%	2860
	21st to end	Day	2 4 2 5% 3 3 4 3 7% 8% 59%	3146
February	1st to 10th	Day	1 3 2 4 2 3 3 3 4 6% 70%	1885
	11th to 20th	Day	2 3 1 4 3 4 3 2 4 6% 69%	1849
	21st to end	Day	1 2 1 3 3 3 2 2 3 6% 74%	1570
March	1st to 10th	Day	1 6% 2 4 3 3 4 3 4 7% 62%	3258
	11th to 20th	Day	4 9% 1 4 3 4 3 3 5% 7% 57%	3490
	21st to end	Day	1 2 1 2 3 3 4 4 6% 9% 64%	3993
April	1st to 10th	Day	1 2 1 3 2 3 3 2 4 6% 73%	2280
	11th to 20th	Day	3 3 1 2 3 2 3 2 5% 6% 70%	2251
	21st to end	Day	2 3 1 2 2 2 2 2 3 4 77%	2280
May	1st to 10th	Day	2 1 2 1 1 2 1 4 5% 80%	3800
	11th to 20th	Day	3 3 1 3 3 4 5% 4 6% 7% 60%	3765
	21st to end	Day	1 1 2 2 2 3 2 3 5% 79%	4415
June	1st to 10th	Day	2 2 1 3 4 4 5% 5% 8% 10% 57%	2660
	11th to 20th	Day	2 2 1 3 2 3 4 4 6% 7% 66%	2660
	21st to end	Day	7% 4 1 5% 5% 5% 7% 6% 9% 7% 43%	2640
July	1st to 10th	Day	7% 4 2 7% 7% 7% 7% 7% 9% 10% 34%	4110
	11th to 20th	Day	5% 3 2 5% 5% 6% 7% 6% 8% 8% 45%	4110
	21st to end	Day	9% 4 2 6% 6% 6% 8% 7% 10% 11% 31%	4399
August	1st to 10th	Day	4 3 1 5% 5% 5% 7% 6% 8% 11% 43%	3784
	11th to 20th	Day	6% 3 2 7% 5% 6% 6% 5% 7% 8% 45%	3726
	21st to end	Day	7% 4 2 7% 6% 7% 7% 7% 9% 9% 36%	4180
September	1st to 10th	Day	10% 5% 2 6% 4 5% 5% 4 7% 8% 43%	2280
	11th to 20th	Day	9% 4 2 7% 4 4 4 4 5% 7% 50%	2268
	21st to end	Day	5% 3 1 4 3 3 3 3 3 6% 64%	2090
October	1st to 10th	Day	5% 3 1 3 3 3 2 3 4 5% 69%	3215
	11th to 20th	Day	4 4 1 3 2 2 4 3 4 5% 67%	3150
	21st to end	Day	1 1 2 1 1 1 1 2 3 86%	3438
November	1st to 10th	Day	2 2 1 1 2 2 2 2 4 5% 77%	1909
	11th to 20th	Day	2 1 3 3 2 3 2 5% 8% 72%	1715
	21st to end	Day	3 3 1 2 3 3 3 3 5% 7% 67%	1710
December	1st to 10th	Day	2 3 1 3 2 3 4 3 5% 8% 67%	1710
	11th to 20th	Day	1 3 2 5% 2 3 3 4 6% 9% 61%	1993
	21st to end	Day	1 3 1 2 2 2 3 3 6% 7% 71%	2930
January	1st to 10th	Night	1 2 1 3 2 3 3 3 4 6% 71%	4097
	11th to 20th	Night	1 2 1 2 2 2 3 3 4 5% 75%	4110
	21st to end	Night	2 4 1 4 3 3 3 3 6% 10% 60%	4521
February	1st to 10th	Night	2 2 3 2 3 3 3 5% 7% 70%	2292
	11th to 20th	Night	2 3 1 2 2 2 3 2 5% 6% 72%	2218
	21st to end	Night	1 2 1 2 1 2 2 3 5% 7% 75%	1884
March	1st to 10th	Night	3 2 3 2 2 3 3 4 7% 71%	3593
	11th to 20th	Night	4 14% 3 3 2 2 2 2 3 5% 59%	3490
	21st to end	Night	1 2 2 2 3 3 6% 8% 72%	3652
April	1st to 10th	Night	1 2 1 2 2 2 2 4 6% 8% 71%	1900
	11th to 20th	Night	2 2 1 2 2 2 2 3 5% 7% 73%	1877
	21st to end	Night	1 2 1 2 2 2 2 2 3 6% 76%	1900
May	1st to 10th	Night	1 2 1 2 1 2 2 2 3 4 80%	3170
	11th to 20th	Night	4 3 1 2 2 2 3 3 3 5% 73%	3140
	21st to end	Night	2 1 1 1 1 1 1 2 3 4 83%	3149
June	1st to 10th	Night	3 3 1 4 4 4 5% 4 6% 9% 57%	1520
	11th to 20th	Night	3 2 1 2 2 2 3 3 4 7% 72%	1520
	21st to end	Night	6% 4 1 5% 4 5% 6% 5% 6% 8% 49%	1531
July	1st to 10th	Night	8% 4 2 4 3 4 5% 5% 8% 12% 45%	2860
	11th to 20th	Night	3 2 1 3 4 5% 6% 6% 8% 9% 53%	2860
	21st to end	Night	7% 6% 2 5% 4 4 5% 5% 10% 14% 39%	3159
August	1st to 10th	Night	3 2 1 4 4 4 4 5% 9% 15% 50%	3155
	11th to 20th	Night	4 3 1 3 3 3 4 4 6% 11% 58%	3113
	21st to end	Night	5% 3 1 4 3 4 5% 5% 8% 14% 46%	3487
September	1st to 10th	Night	7% 4 2 5% 3 3 5% 4 7% 8% 52%	1900
	11th to 20th	Night	8% 3 1 3 2 2 3 3 5% 8% 60%	1910
	21st to end	Night	6% 3 1 2 2 2 3 2 4 7% 68%	2090
October	1st to 10th	Night	3 2 2 2 2 2 1 3 5% 78%	3736
	11th to 20th	Night	3 3 1 3 2 3 3 3 4 5% 71%	3778
	21st to end	Night	2 1 1 2 1 1 2 1 2 5% 83%	4120
November	1st to 10th	Night	3 3 1 2 2 2 2 2 3 5% 75%	2292
	11th to 20th	Night	1 1 3 2 3 3 2 4 7% 73%	2441
	21st to end	Night	2 4 1 3 3 3 3 3 4 6% 67%	2470
December	1st to 10th	Night	3 3 1 2 2 2 3 3 4 8% 69%	2470
	11th to 20th	Night	1 2 1 3 3 3 4 4 5% 8% 65%	3199
	21st to end	Night	1 3 1 3 2 2 3 2 5% 5% 72%	4763

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	15% 3 4 21% 31% 26%	2859
	11th to 20th	Day	10% 2 7% 21% 37% 23%	2860
	21st to end	Day	22% 2 12% 20% 29% 15%	3146
February	1st to 10th	Day	16% 4 5% 18% 30% 27%	1885
	11th to 20th	Day	18% 4 5% 18% 27% 28%	1859
	21st to end	Day	15% 1 6% 12% 29% 37%	1570
March	1st to 10th	Day	22% 4 6% 12% 22% 35%	3258
	11th to 20th	Day	22% 9% 6% 14% 32% 16%	3490
	21st to end	Day	17% 4 7% 22% 30% 20%	3993
April	1st to 10th	Day	14% 3 5% 17% 36% 26%	2280
	11th to 20th	Day	16% 2 4 14% 30% 34%	2254
	21st to end	Day	13% 2 5% 18% 34% 28%	2280
May	1st to 10th	Day	9% 1 4 12% 25% 49%	3800
	11th to 20th	Day	18% 9% 6% 14% 24% 29%	3768
	21st to end	Day	9% 3 4 12% 17% 55%	4415
June	1st to 10th	Day	19% 6% 11% 19% 25% 19%	2660
	11th to 20th	Day	15% 4 5% 16% 23% 36%	2660
	21st to end	Day	32% 8% 12% 16% 18% 14%	2640
July	1st to 10th	Day	38% 11% 17% 15% 12% 7%	4046
	11th to 20th	Day	32% 8% 13% 21% 23% 4	4041
	21st to end	Day	39% 9% 19% 23% 10% 1	4260
August	1st to 10th	Day	30% 8% 12% 32% 15% 2	3772
	11th to 20th	Day	33% 7% 13% 21% 24% 2	3762
	21st to end	Day	36% 10% 18% 25% 9% 1	4179
September	1st to 10th	Day	36% 6% 13% 17% 18% 10%	2280
	11th to 20th	Day	33% 5% 8% 18% 26% 10%	2268
	21st to end	Day	22% 3 7% 23% 31% 14%	2090
October	1st to 10th	Day	19% 2 7% 11% 31% 30%	3215
	11th to 20th	Day	18% 3 8% 18% 30% 22%	3150
	21st to end	Day	8% 1 3 14% 40% 34%	3438
November	1st to 10th	Day	13% 2 4 23% 34% 25%	1909
	11th to 20th	Day	14% 2 7% 22% 31% 25%	1715
	21st to end	Day	18% 3 8% 17% 27% 27%	1710
December	1st to 10th	Day	18% 3 7% 24% 32% 17%	1710
	11th to 20th	Day	20% 3 10% 18% 30% 19%	1991
	21st to end	Day	13% 2 8% 16% 30% 32%	2930
January	1st to 10th	Night	15% 3 5% 19% 31% 26%	4097
	11th to 20th	Night	13% 3 8% 17% 35% 24%	4110
	21st to end	Night	20% 2 12% 21% 29% 15%	4521
February	1st to 10th	Night	14% 4 8% 18% 27% 29%	2292
	11th to 20th	Night	14% 4 6% 18% 29% 28%	2218
	21st to end	Night	11% 1 9% 16% 28% 35%	1884
March	1st to 10th	Night	14% 3 6% 14% 30% 34%	3593
	11th to 20th	Night	26% 7% 6% 14% 31% 16%	3490
	21st to end	Night	12% 2 7% 26% 34% 19%	3652
April	1st to 10th	Night	11% 3 6% 18% 36% 26%	1900
	11th to 20th	Night	12% 2 7% 17% 30% 32%	1877
	21st to end	Night	11% 4 5% 19% 35% 25%	1900
May	1st to 10th	Night	8% 4 3 9% 23% 52%	3170
	11th to 20th	Night	14% 3 7% 18% 26% 32%	3141
	21st to end	Night	8% 2 4 10% 20% 56%	3150
June	1st to 10th	Night	21% 6% 10% 19% 23% 21%	1520
	11th to 20th	Night	14% 2 5% 17% 22% 40%	1520
	21st to end	Night	31% 5% 15% 17% 14% 17%	1531
July	1st to 10th	Night	29% 7% 20% 21% 15% 7%	2815
	11th to 20th	Night	23% 7% 15% 30% 21% 4	2806
	21st to end	Night	31% 7% 24% 27% 11% 1	3060
August	1st to 10th	Night	21% 6% 19% 35% 17% 2	3144
	11th to 20th	Night	20% 5% 16% 30% 27% 2	3143
	21st to end	Night	26% 8% 23% 27% 15% 1	3487
September	1st to 10th	Night	29% 6% 16% 18% 19% 13%	1900
	11th to 20th	Night	23% 6% 12% 20% 27% 12%	1910
	21st to end	Night	19% 3 10% 22% 33% 13%	2090
October	1st to 10th	Night	13% 2 6% 11% 34% 34%	3736
	11th to 20th	Night	17% 3 8% 14% 33% 25%	3778
	21st to end	Night	9% 2 3 14% 37% 35%	4120
November	1st to 10th	Night	14% 2 4 20% 32% 28%	2292
	11th to 20th	Night	12% 4 5% 21% 32% 27%	2441
	21st to end	Night	19% 3 7% 18% 29% 24%	2470
December	1st to 10th	Night	16% 3 9% 21% 28% 23%	2470
	11th to 20th	Night	19% 2 9% 22% 26% 22%	3200
	21st to end	Night	15% 2 7% 19% 28% 29%	4763

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% 28% 34% 18% 4	270
	11th to 20th	Day	21% 21% 32% 18% 7% 1	270
	21st to end	Day	11% 26% 31% 22% 10% 1	297
February	1st to 10th	Day	16% 25% 30% 22% 6% 1	270
	11th to 20th	Day	22% 26% 33% 15% 3 1	270
	21st to end	Day	32% 28% 25% 10% 4	225
March	1st to 10th	Day	21% 29% 34% 12% 4	346
	11th to 20th	Day	22% 25% 33% 13% 6% 1	460
	21st to end	Day	25% 31% 33% 8% 3 1	506
April	1st to 10th	Day	14% 32% 37% 13% 3 1	460
	11th to 20th	Day	17% 33% 33% 15% 3	452
	21st to end	Day	16% 30% 35% 16% 3	460
May	1st to 10th	Day	8% 30% 40% 19% 3	463
	11th to 20th	Day	9% 21% 38% 22% 8% 2	488
	21st to end	Day	7% 18% 43% 22% 9% 1	642
June	1st to 10th	Day	3 8% 32% 35% 19% 3	680
	11th to 20th	Day	3 9% 32% 38% 15% 3	680
	21st to end	Day	8% 4 19% 34% 28% 7%	660
July	1st to 10th	Day	7% 1 14% 36% 33% 10%	486
	11th to 20th	Day	4 1 8% 39% 35% 12%	484
	21st to end	Day	5% 1 8% 31% 40% 15%	531
August	1st to 10th	Day	5% 2 8% 32% 39% 16%	487
	11th to 20th	Day	9% 2 12% 34% 32% 11%	477
	21st to end	Day	8% 3 9% 37% 33% 11%	539
September	1st to 10th	Day	12% 3 17% 38% 23% 7%	490
	11th to 20th	Day	5% 4 19% 45% 22% 5%	478
	21st to end	Day	6% 7% 30% 32% 21% 4	300
October	1st to 10th	Day	11% 10% 27% 33% 16% 4	300
	11th to 20th	Day	12% 11% 34% 23% 17% 4	300
	21st to end	Day	13% 16% 29% 25% 11% 6%	330
November	1st to 10th	Day	15% 22% 32% 18% 11% 1	285
	11th to 20th	Day	9% 17% 33% 21% 16% 4	270
	21st to end	Day	18% 27% 27% 17% 11% 1	270
December	1st to 10th	Day	20% 19% 31% 23% 6% 1	270
	11th to 20th	Day	17% 26% 32% 21% 5%	270
	21st to end	Day	22% 27% 32% 14% 5%	297
January	1st to 10th	Night	9% 22% 32% 23% 11% 3	760
	11th to 20th	Night	11% 23% 30% 24% 9% 3	760
	21st to end	Night	12% 22% 28% 26% 10% 2	836
February	1st to 10th	Night	9% 23% 35% 21% 8% 3	760
	11th to 20th	Night	12% 22% 41% 19% 5% 1	744
	21st to end	Night	17% 30% 35% 14% 3 1	628
March	1st to 10th	Night	14% 27% 29% 23% 6% 1	760
	11th to 20th	Night	13% 20% 30% 27% 9% 1	760
	21st to end	Night	12% 25% 38% 19% 6%	737
April	1st to 10th	Night	11% 23% 42% 19% 5%	570
	11th to 20th	Night	11% 22% 38% 23% 5%	563
	21st to end	Night	9% 24% 34% 27% 6%	570
May	1st to 10th	Night	5% 20% 43% 28% 4	570
	11th to 20th	Night	7% 13% 32% 35% 11% 2	561
	21st to end	Night	7% 13% 38% 31% 11%	617
June	1st to 10th	Night	3 5% 29% 44% 18% 1	570
	11th to 20th	Night	4 5% 31% 41% 17% 2	570
	21st to end	Night	6% 3 17% 42% 29% 2	570
July	1st to 10th	Night	8% 2 6% 40% 41% 3	555
	11th to 20th	Night	4 1 5% 35% 46% 8%	552
	21st to end	Night	6% 2 3 28% 50% 11%	624
August	1st to 10th	Night	6% 1 3 30% 47% 13%	567
	11th to 20th	Night	5% 2 5% 32% 43% 13%	564
	21st to end	Night	5% 1 6% 29% 50% 9%	627
September	1st to 10th	Night	7% 3 7% 37% 38% 7%	570
	11th to 20th	Night	9% 1 12% 43% 30% 4	570
	21st to end	Night	7% 4 16% 43% 27% 3	570
October	1st to 10th	Night	7% 8% 23% 39% 20% 3	722
	11th to 20th	Night	8% 10% 28% 35% 16% 3	760
	21st to end	Night	9% 13% 27% 28% 16% 7%	836
November	1st to 10th	Night	8% 14% 30% 29% 14% 5%	764
	11th to 20th	Night	5% 14% 29% 35% 14% 3	921
	21st to end	Night	11% 20% 29% 23% 13% 3	950
December	1st to 10th	Night	13% 20% 28% 27% 10% 2	950
	11th to 20th	Night	12% 25% 31% 23% 8% 1	950
	21st to end	Night	15% 25% 31% 22% 5% 2	974

Page generated at 2024-11-03 11:19:01. Version ac07

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