Taos
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Taos clear sky chart from 2005-11-06 to 2025-07-06.

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 5% 2 5% 3 4 4 4 6% 8% 57%	123625
	Night	3 6% 2 5% 3 3 4 3 5% 7% 57%	124068
Transparency	Day	23% 6% 11% 23% 25% 11%	123379
	Night	24% 6% 11% 22% 26% 11%	123902
Seeing	Day	10% 18% 30% 26% 13% 2	16156
	Night	7% 11% 33% 33% 15% 1	26242

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 8% 5% 8% 3 3 3 2 4 6% 57%	3793
	11th to 20th	Day	2 9% 5% 9% 3 3 3 2 4 6% 55%	4100
	21st to end	Day	2 7% 3 6% 4 3 3 3 4 6% 57%	4510
February	1st to 10th	Day	2 10% 3 6% 2 3 2 3 4 7% 56%	1840
	11th to 20th	Day	2 9% 3 7% 3 3 3 3 5% 7% 55%	1949
	21st to end	Day	3 11% 4 6% 3 2 3 2 5% 6% 54%	1650
March	1st to 10th	Day	2 10% 3 5% 3 3 3 3 3 6% 59%	4610
	11th to 20th	Day	2 11% 4 6% 5% 4 4 4 7% 8% 46%	5000
	21st to end	Day	2 8% 3 5% 4 3 4 3 5% 8% 55%	5740
April	1st to 10th	Day	3 7% 2 4 3 4 4 4 4 6% 59%	2400
	11th to 20th	Day	3 7% 2 5% 3 3 4 4 5% 6% 59%	2371
	21st to end	Day	4 7% 2 4 3 4 3 3 5% 8% 57%	2400
May	1st to 10th	Day	4 5% 2 4 4 4 5% 5% 7% 8% 53%	5440
	11th to 20th	Day	4 4 1 4 3 4 4 4 5% 6% 61%	5870
	21st to end	Day	2 2 1 3 3 3 4 4 5% 9% 67%	6925
June	1st to 10th	Day	3 2 1 4 2 4 5% 4 6% 10% 59%	2800
	11th to 20th	Day	2 2 1 2 2 3 4 4 6% 7% 67%	2800
	21st to end	Day	4 3 1 4 4 5% 5% 5% 7% 7% 54%	2800
July	1st to 10th	Day	3 3 1 4 4 5% 5% 5% 7% 7% 56%	4501
	11th to 20th	Day	2 2 1 4 5% 6% 9% 7% 10% 11% 42%	4273
	21st to end	Day	5% 4 1 6% 5% 7% 7% 7% 10% 11% 37%	4454
August	1st to 10th	Day	4 4 2 7% 6% 7% 7% 8% 9% 11% 35%	3973
	11th to 20th	Day	3 2 1 3 4 5% 5% 3 7% 10% 58%	3726
	21st to end	Day	4 3 2 6% 4 5% 6% 6% 10% 12% 41%	4180
September	1st to 10th	Day	6% 4 2 5% 4 5% 5% 5% 6% 7% 50%	2280
	11th to 20th	Day	6% 4 2 5% 4 3 4 4 6% 7% 56%	2276
	21st to end	Day	4 3 1 3 2 3 4 3 5% 7% 65%	2087
October	1st to 10th	Day	4 2 1 3 3 2 3 3 4 5% 69%	3170
	11th to 20th	Day	4 4 1 5% 4 4 4 3 6% 6% 60%	3150
	21st to end	Day	4 3 1 2 2 2 2 2 3 4 75%	3438
November	1st to 10th	Day	2 5% 1 3 2 2 3 2 4 8% 68%	1822
	11th to 20th	Day	3 4 1 3 2 2 3 3 4 7% 70%	1800
	21st to end	Day	3 9% 2 6% 3 2 3 3 4 5% 61%	1800
December	1st to 10th	Day	3 4 2 3 1 1 2 1 3 7% 74%	2667
	11th to 20th	Day	2 6% 2 3 3 3 3 3 6% 10% 60%	3026
	21st to end	Day	1 7% 3 4 3 3 3 2 4 6% 63%	4004
January	1st to 10th	Night	1 8% 5% 7% 4 3 3 3 3 6% 56%	6216
	11th to 20th	Night	2 11% 5% 9% 4 3 2 2 4 5% 51%	5880
	21st to end	Night	2 10% 3 7% 4 3 3 2 4 6% 55%	6468
February	1st to 10th	Night	2 10% 4 6% 3 3 3 2 3 6% 58%	2559
	11th to 20th	Night	3 11% 3 7% 4 3 3 2 4 6% 54%	2338
	21st to end	Night	4 12% 3 5% 3 2 2 2 4 6% 56%	1980
March	1st to 10th	Night	2 12% 3 6% 3 3 3 3 4 5% 58%	5254
	11th to 20th	Night	2 11% 3 7% 4 4 4 2 4 5% 53%	5000
	21st to end	Night	4 12% 3 6% 3 3 3 2 4 6% 54%	5221
April	1st to 10th	Night	4 7% 1 4 3 3 3 3 5% 6% 60%	2000
	11th to 20th	Night	3 8% 2 5% 4 4 4 3 5% 7% 57%	1977
	21st to end	Night	5% 7% 2 4 3 3 3 3 5% 5% 59%	2000
May	1st to 10th	Night	4 5% 1 5% 4 4 4 4 6% 7% 55%	4540
	11th to 20th	Night	4 4 1 5% 3 3 4 4 6% 8% 59%	4013
	21st to end	Night	3 3 1 4 3 4 4 3 5% 7% 64%	3972
June	1st to 10th	Night	2 2 1 3 3 3 5% 5% 9% 9% 59%	1600
	11th to 20th	Night	2 2 1 4 3 3 4 3 6% 6% 68%	1600
	21st to end	Night	4 3 1 4 4 4 4 4 8% 10% 53%	1600
July	1st to 10th	Night	2 4 2 6% 5% 5% 6% 5% 7% 8% 50%	2580
	11th to 20th	Night	2 2 1 5% 4 6% 7% 7% 11% 13% 43%	2692
	21st to end	Night	4 4 2 6% 5% 5% 6% 6% 9% 11% 41%	3109
August	1st to 10th	Night	4 4 2 7% 6% 7% 9% 7% 11% 12% 32%	2965
	11th to 20th	Night	2 3 1 5% 5% 5% 6% 6% 10% 13% 44%	3113
	21st to end	Night	2 3 2 6% 6% 7% 8% 8% 11% 13% 34%	3487
September	1st to 10th	Night	5% 3 2 4 3 4 6% 4 6% 9% 53%	1900
	11th to 20th	Night	4 2 1 3 3 4 4 3 5% 9% 62%	1902
	21st to end	Night	5% 3 1 3 2 3 3 3 4 6% 67%	2090
October	1st to 10th	Night	3 3 1 3 2 2 3 2 4 5% 73%	3799
	11th to 20th	Night	4 3 2 4 2 2 3 3 5% 8% 65%	3778
	21st to end	Night	3 4 1 2 2 2 3 2 4 6% 73%	4120
November	1st to 10th	Night	2 3 1 3 2 2 2 2 4 6% 72%	2454
	11th to 20th	Night	3 4 1 2 2 2 2 2 5% 6% 73%	2600
	21st to end	Night	4 8% 2 4 2 2 3 3 5% 6% 60%	2600
December	1st to 10th	Night	3 5% 1 3 2 2 2 1 2 5% 74%	4506
	11th to 20th	Night	2 6% 2 3 2 2 2 3 4 8% 66%	5181
	21st to end	Night	2 9% 3 6% 3 3 3 3 4 6% 57%	6974

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	27% 3 9% 29% 27% 5%	3794
	11th to 20th	Day	25% 7% 12% 22% 21% 13%	4100
	21st to end	Day	27% 6% 8% 19% 28% 12%	4510
February	1st to 10th	Day	29% 4 13% 23% 22% 9%	1840
	11th to 20th	Day	28% 4 11% 25% 25% 7%	1959
	21st to end	Day	29% 4 8% 16% 29% 14%	1650
March	1st to 10th	Day	24% 5% 6% 16% 35% 15%	4610
	11th to 20th	Day	32% 5% 12% 21% 25% 4	5000
	21st to end	Day	24% 5% 8% 38% 20% 4	5740
April	1st to 10th	Day	24% 4 11% 23% 26% 13%	2400
	11th to 20th	Day	25% 5% 8% 20% 29% 13%	2374
	21st to end	Day	24% 5% 9% 23% 29% 10%	2400
May	1st to 10th	Day	24% 6% 14% 20% 23% 13%	5440
	11th to 20th	Day	20% 6% 10% 17% 34% 12%	5874
	21st to end	Day	13% 4 10% 18% 31% 23%	6926
June	1st to 10th	Day	18% 7% 13% 22% 24% 17%	2800
	11th to 20th	Day	14% 5% 9% 17% 26% 30%	2800
	21st to end	Day	25% 6% 13% 19% 21% 17%	2800
July	1st to 10th	Day	25% 8% 11% 16% 18% 23%	4432
	11th to 20th	Day	27% 9% 18% 34% 8% 4	4198
	21st to end	Day	33% 10% 18% 28% 7% 3	4314
August	1st to 10th	Day	37% 11% 21% 19% 7% 5%	3959
	11th to 20th	Day	20% 7% 20% 25% 18% 11%	3762
	21st to end	Day	30% 9% 23% 22% 13% 2	4179
September	1st to 10th	Day	30% 7% 14% 21% 19% 9%	2280
	11th to 20th	Day	25% 6% 10% 20% 25% 14%	2276
	21st to end	Day	18% 4 10% 24% 33% 12%	2087
October	1st to 10th	Day	16% 5% 6% 15% 38% 19%	3170
	11th to 20th	Day	23% 3 9% 22% 32% 12%	3150
	21st to end	Day	14% 2 5% 23% 43% 13%	3438
November	1st to 10th	Day	16% 4 11% 23% 35% 12%	1822
	11th to 20th	Day	15% 3 10% 30% 34% 8%	1800
	21st to end	Day	25% 3 8% 21% 31% 12%	1800
December	1st to 10th	Day	13% 4 9% 29% 38% 6%	2667
	11th to 20th	Day	19% 5% 9% 28% 34% 4	3024
	21st to end	Day	21% 3 11% 29% 30% 6%	4004
January	1st to 10th	Night	27% 5% 9% 28% 24% 6%	6216
	11th to 20th	Night	33% 6% 8% 20% 21% 11%	5880
	21st to end	Night	28% 6% 8% 20% 27% 10%	6468
February	1st to 10th	Night	29% 3 13% 23% 24% 8%	2559
	11th to 20th	Night	31% 5% 11% 25% 23% 6%	2338
	21st to end	Night	29% 3 7% 18% 32% 11%	1980
March	1st to 10th	Night	26% 4 7% 13% 37% 12%	5254
	11th to 20th	Night	32% 6% 8% 21% 27% 7%	5000
	21st to end	Night	26% 7% 9% 34% 20% 4	5221
April	1st to 10th	Night	22% 5% 11% 25% 26% 11%	2000
	11th to 20th	Night	25% 6% 10% 19% 26% 14%	1977
	21st to end	Night	24% 7% 10% 23% 27% 9%	2000
May	1st to 10th	Night	23% 7% 14% 20% 22% 14%	4537
	11th to 20th	Night	20% 10% 11% 20% 25% 14%	4014
	21st to end	Night	15% 5% 12% 15% 25% 27%	3972
June	1st to 10th	Night	18% 11% 15% 19% 21% 17%	1600
	11th to 20th	Night	14% 6% 8% 15% 26% 31%	1600
	21st to end	Night	23% 8% 14% 18% 20% 17%	1600
July	1st to 10th	Night	29% 9% 11% 14% 13% 24%	2540
	11th to 20th	Night	26% 10% 24% 27% 7% 5%	2644
	21st to end	Night	32% 11% 21% 25% 9% 1	3011
August	1st to 10th	Night	37% 13% 22% 16% 7% 5%	2956
	11th to 20th	Night	26% 10% 21% 18% 16% 9%	3143
	21st to end	Night	35% 10% 23% 19% 10% 3	3487
September	1st to 10th	Night	26% 8% 15% 23% 20% 9%	1900
	11th to 20th	Night	18% 8% 15% 18% 26% 15%	1902
	21st to end	Night	18% 5% 10% 22% 33% 12%	2090
October	1st to 10th	Night	14% 5% 7% 16% 41% 17%	3799
	11th to 20th	Night	18% 3 10% 21% 34% 14%	3778
	21st to end	Night	14% 3 5% 24% 39% 15%	4120
November	1st to 10th	Night	14% 3 8% 25% 37% 12%	2454
	11th to 20th	Night	13% 3 10% 31% 33% 10%	2600
	21st to end	Night	24% 4 9% 21% 30% 12%	2600
December	1st to 10th	Night	16% 3 6% 31% 37% 7%	4506
	11th to 20th	Night	19% 3 9% 27% 36% 7%	5182
	21st to end	Night	26% 4 12% 26% 30% 3	6974

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	12% 27% 32% 20% 9%	300
	11th to 20th	Day	16% 24% 30% 24% 5% 1	300
	21st to end	Day	7% 20% 42% 22% 9% 1	330
February	1st to 10th	Day	11% 32% 33% 19% 5%	300
	11th to 20th	Day	12% 38% 32% 15% 4	300
	21st to end	Day	20% 34% 29% 15% 2	249
March	1st to 10th	Day	15% 30% 31% 18% 5%	345
	11th to 20th	Day	17% 28% 32% 18% 4 1	500
	21st to end	Day	20% 38% 27% 12% 2 1	550
April	1st to 10th	Day	17% 32% 35% 13% 3 1	500
	11th to 20th	Day	20% 38% 30% 9% 2	492
	21st to end	Day	17% 34% 35% 13% 1	500
May	1st to 10th	Day	14% 31% 38% 14% 3 1	503
	11th to 20th	Day	11% 21% 34% 23% 9% 2	665
	21st to end	Day	8% 19% 35% 28% 9% 1	789
June	1st to 10th	Day	3 10% 35% 33% 17% 2	730
	11th to 20th	Day	4 13% 36% 30% 15% 2	730
	21st to end	Day	5% 11% 32% 29% 21% 3	730
July	1st to 10th	Day	6% 4 22% 36% 27% 4	697
	11th to 20th	Day	4 3 16% 40% 29% 8%	576
	21st to end	Day	7% 2 15% 38% 32% 6%	531
August	1st to 10th	Day	7% 3 21% 40% 23% 5%	487
	11th to 20th	Day	5% 4 26% 40% 21% 4	477
	21st to end	Day	6% 3 24% 40% 23% 4	539
September	1st to 10th	Day	6% 6% 25% 36% 23% 4	490
	11th to 20th	Day	6% 8% 37% 32% 14% 3	486
	21st to end	Day	3 14% 26% 35% 18% 5%	300
October	1st to 10th	Day	6% 20% 23% 27% 18% 6%	300
	11th to 20th	Day	10% 18% 32% 26% 11% 4	300
	21st to end	Day	13% 19% 30% 26% 10% 2	330
November	1st to 10th	Day	12% 25% 30% 25% 7% 1	300
	11th to 20th	Day	7% 18% 36% 26% 13% 1	300
	21st to end	Day	11% 25% 33% 20% 9% 2	300
December	1st to 10th	Day	13% 21% 32% 22% 10% 2	300
	11th to 20th	Day	10% 21% 39% 24% 5% 1	300
	21st to end	Day	19% 25% 37% 15% 3 1	330
January	1st to 10th	Night	8% 15% 35% 31% 10% 1	954
	11th to 20th	Night	9% 12% 39% 30% 8% 2	800
	21st to end	Night	8% 12% 39% 29% 11% 1	880
February	1st to 10th	Night	9% 14% 45% 27% 6%	800
	11th to 20th	Night	11% 16% 46% 23% 5% 1	784
	21st to end	Night	13% 18% 48% 20% 1	660
March	1st to 10th	Night	10% 19% 41% 24% 6%	800
	11th to 20th	Night	11% 13% 34% 33% 10%	800
	21st to end	Night	11% 18% 42% 25% 5%	767
April	1st to 10th	Night	10% 22% 41% 24% 2	600
	11th to 20th	Night	9% 23% 38% 24% 5%	593
	21st to end	Night	8% 18% 43% 26% 5%	600
May	1st to 10th	Night	7% 13% 41% 32% 8%	600
	11th to 20th	Night	8% 11% 34% 34% 12% 1	591
	21st to end	Night	6% 11% 37% 38% 8%	650
June	1st to 10th	Night	3 6% 28% 47% 17%	600
	11th to 20th	Night	2 6% 37% 43% 12% 1	600
	21st to end	Night	3 4 25% 43% 24% 2	600
July	1st to 10th	Night	4 1 14% 46% 32% 3	570
	11th to 20th	Night	2 1 9% 38% 46% 4	552
	21st to end	Night	4 1 7% 33% 48% 8%	624
August	1st to 10th	Night	4 1 10% 36% 44% 6%	567
	11th to 20th	Night	3 3 11% 45% 34% 3	564
	21st to end	Night	3 1 11% 44% 36% 4	627
September	1st to 10th	Night	5% 1 16% 47% 29% 2	570
	11th to 20th	Night	4 3 19% 48% 25% 2	570
	21st to end	Night	6% 5% 24% 46% 18% 1	570
October	1st to 10th	Night	6% 8% 30% 39% 16% 1	759
	11th to 20th	Night	6% 8% 37% 34% 14% 2	760
	21st to end	Night	7% 10% 34% 31% 14% 4	836
November	1st to 10th	Night	5% 11% 32% 38% 12% 2	894
	11th to 20th	Night	5% 13% 37% 32% 12% 1	1000
	21st to end	Night	9% 12% 35% 30% 12% 1	1000
December	1st to 10th	Night	10% 15% 38% 27% 9% 1	1000
	11th to 20th	Night	11% 14% 37% 30% 8%	1000
	21st to end	Night	10% 15% 43% 26% 5%	1100

Page generated at 2025-07-02 23:30:15. Version ac07

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