Santa Fe (TX)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Santa Fe (TX) clear sky chart from 2005-11-06 to 2026-04-02.

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	12% 6% 2 6% 5% 5% 5% 4 6% 8% 40%	131427
	Night	14% 7% 2 6% 4 4 4 3 5% 7% 44%	130664
Transparency	Day	39% 8% 14% 20% 14% 6%	135075
	Night	38% 6% 13% 19% 16% 8%	135080
Seeing	Day	12% 6% 18% 28% 25% 12%	16556
	Night	14% 5% 18% 31% 27% 5%	26522

By Month

Percentage Cloud Cover SE (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	19% 10% 3 6% 4 3 4 2 3 5% 41%	5289
	11th to 20th	Day	12% 7% 2 7% 4 3 3 3 4 6% 48%	5310
	21st to end	Day	27% 9% 3 9% 3 2 3 3 5% 6% 30%	5812
February	1st to 10th	Day	18% 10% 3 7% 4 4 4 4 4 5% 37%	1979
	11th to 20th	Day	22% 10% 2 6% 5% 4 3 3 6% 5% 35%	2109
	21st to end	Day	20% 9% 2 5% 4 4 3 2 4 7% 38%	1903
March	1st to 10th	Day	16% 7% 3 7% 5% 4 5% 4 6% 8% 36%	5046
	11th to 20th	Day	12% 6% 2 7% 4 5% 5% 4 5% 6% 45%	5090
	21st to end	Day	17% 7% 3 6% 4 4 4 3 5% 6% 41%	5583
April	1st to 10th	Day	16% 9% 2 7% 4 4 3 4 5% 8% 38%	2211
	11th to 20th	Day	15% 8% 2 7% 5% 5% 4 3 6% 7% 38%	2344
	21st to end	Day	11% 7% 3 7% 4 5% 5% 5% 5% 7% 43%	2400
May	1st to 10th	Day	16% 8% 3 9% 6% 6% 5% 5% 7% 8% 26%	5405
	11th to 20th	Day	10% 6% 2 6% 4 5% 5% 4 6% 8% 44%	5814
	21st to end	Day	8% 6% 2 7% 5% 6% 6% 6% 9% 11% 34%	6434
June	1st to 10th	Day	5% 5% 2 6% 5% 6% 5% 5% 9% 10% 43%	2600
	11th to 20th	Day	5% 4 1 6% 5% 6% 7% 7% 9% 12% 38%	2600
	21st to end	Day	8% 5% 2 5% 6% 7% 8% 6% 9% 12% 32%	2600
July	1st to 10th	Day	7% 6% 2 7% 5% 6% 6% 6% 10% 14% 31%	5900
	11th to 20th	Day	6% 6% 3 8% 7% 6% 7% 6% 9% 11% 32%	5900
	21st to end	Day	9% 7% 3 7% 5% 5% 5% 5% 7% 9% 37%	6422
August	1st to 10th	Day	2 2 1 3 3 4 5% 5% 8% 12% 55%	4234
	11th to 20th	Day	3 3 1 4 4 4 6% 6% 9% 15% 46%	3942
	21st to end	Day	7% 4 2 7% 6% 6% 7% 5% 8% 11% 36%	4282
September	1st to 10th	Day	9% 7% 2 7% 6% 6% 7% 5% 8% 10% 34%	2200
	11th to 20th	Day	14% 7% 2 7% 5% 6% 6% 5% 7% 7% 35%	2200
	21st to end	Day	9% 5% 2 6% 4 5% 4 4 7% 9% 45%	2200
October	1st to 10th	Day	7% 4 2 5% 3 4 4 4 6% 8% 54%	2062
	11th to 20th	Day	11% 5% 2 4 3 3 3 3 6% 7% 53%	2000
	21st to end	Day	11% 4 2 4 4 3 3 3 5% 6% 54%	2200
November	1st to 10th	Day	10% 5% 2 5% 5% 5% 5% 4 5% 8% 46%	2058
	11th to 20th	Day	14% 5% 2 5% 4 5% 4 4 4 7% 48%	2100
	21st to end	Day	15% 7% 2 6% 4 5% 4 3 5% 6% 43%	2100
December	1st to 10th	Day	24% 9% 2 6% 4 3 3 3 5% 7% 33%	3030
	11th to 20th	Day	11% 7% 2 6% 5% 4 5% 4 6% 8% 43%	3481
	21st to end	Day	14% 7% 2 6% 4 4 4 3 5% 6% 45%	4587
January	1st to 10th	Night	17% 7% 3 6% 3 4 4 3 5% 5% 43%	7634
	11th to 20th	Night	14% 8% 3 7% 3 3 4 3 4 5% 47%	7680
	21st to end	Night	27% 10% 3 8% 4 3 3 2 4 6% 31%	8402
February	1st to 10th	Night	18% 9% 3 7% 4 3 4 3 4 6% 39%	2656
	11th to 20th	Night	20% 9% 3 5% 4 2 3 3 4 5% 42%	2395
	21st to end	Night	18% 9% 3 7% 4 4 3 3 4 5% 40%	1903
March	1st to 10th	Night	22% 10% 3 6% 4 4 3 3 4 6% 36%	5029
	11th to 20th	Night	16% 9% 2 6% 4 3 3 3 4 6% 44%	5090
	21st to end	Night	17% 10% 2 5% 4 3 4 3 4 5% 43%	5588
April	1st to 10th	Night	15% 7% 3 7% 4 4 4 3 6% 8% 40%	2211
	11th to 20th	Night	16% 6% 2 4 4 3 4 3 5% 7% 44%	2005
	21st to end	Night	12% 5% 3 6% 5% 5% 5% 4 5% 7% 42%	2000
May	1st to 10th	Night	24% 9% 3 7% 4 4 4 4 6% 8% 27%	4490
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 6% 7% 42%	4081
	21st to end	Night	15% 7% 3 7% 5% 5% 5% 5% 8% 11% 30%	4443
June	1st to 10th	Night	5% 4 1 4 3 3 4 4 6% 12% 55%	1800
	11th to 20th	Night	6% 3 1 4 5% 3 4 4 7% 11% 53%	1800
	21st to end	Night	5% 4 2 6% 5% 5% 5% 6% 8% 12% 43%	1800
July	1st to 10th	Night	5% 5% 2 6% 5% 4 4 4 8% 14% 43%	4078
	11th to 20th	Night	3 4 2 6% 5% 5% 5% 4 8% 12% 46%	4077
	21st to end	Night	6% 5% 2 7% 5% 5% 5% 4 7% 10% 44%	4449
August	1st to 10th	Night	1 2 2 2 3 2 5% 9% 73%	2926
	11th to 20th	Night	2 2 1 2 3 2 4 4 7% 16% 58%	3108
	21st to end	Night	4 3 1 5% 4 5% 5% 5% 8% 13% 48%	3609
September	1st to 10th	Night	5% 5% 2 7% 5% 5% 5% 5% 9% 11% 42%	2200
	11th to 20th	Night	11% 6% 2 6% 4 4 5% 4 7% 7% 45%	2200
	21st to end	Night	8% 4 3 5% 4 4 4 3 5% 8% 54%	2200
October	1st to 10th	Night	5% 4 2 5% 3 3 4 3 4 6% 61%	2316
	11th to 20th	Night	8% 3 2 4 2 3 3 3 5% 6% 62%	2400
	21st to end	Night	10% 4 2 4 4 2 3 3 4 4 61%	2640
November	1st to 10th	Night	9% 6% 2 6% 3 3 3 3 5% 6% 54%	2460
	11th to 20th	Night	12% 4 2 4 4 4 4 3 5% 6% 53%	2520
	21st to end	Night	14% 6% 3 6% 5% 4 4 3 5% 5% 46%	2520
December	1st to 10th	Night	24% 10% 3 8% 4 3 3 3 4 6% 32%	4375
	11th to 20th	Night	13% 7% 3 7% 4 4 4 4 5% 6% 43%	4946
	21st to end	Night	15% 7% 3 7% 4 3 4 3 4 5% 46%	6633

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	47% 4 7% 20% 16% 6%	5290
	11th to 20th	Day	37% 6% 5% 22% 18% 12%	5310
	21st to end	Day	56% 3 5% 13% 15% 9%	5812
February	1st to 10th	Day	49% 5% 7% 13% 16% 10%	1979
	11th to 20th	Day	50% 5% 10% 12% 16% 7%	2119
	21st to end	Day	47% 7% 9% 14% 16% 8%	1903
March	1st to 10th	Day	44% 8% 9% 17% 11% 11%	5046
	11th to 20th	Day	39% 6% 9% 12% 20% 14%	5090
	21st to end	Day	43% 6% 10% 19% 19% 4	5585
April	1st to 10th	Day	45% 8% 8% 17% 14% 8%	2211
	11th to 20th	Day	44% 6% 11% 16% 15% 8%	2344
	21st to end	Day	39% 8% 11% 19% 18% 5%	2400
May	1st to 10th	Day	50% 10% 12% 16% 9% 3	5440
	11th to 20th	Day	36% 6% 15% 22% 18% 3	5818
	21st to end	Day	37% 13% 15% 27% 7% 1	6447
June	1st to 10th	Day	31% 9% 19% 26% 15%	2600
	11th to 20th	Day	32% 11% 18% 26% 12% 1	2600
	21st to end	Day	37% 13% 20% 22% 8%	2600
July	1st to 10th	Day	37% 10% 34% 17% 2	5836
	11th to 20th	Day	40% 11% 29% 16% 2	5831
	21st to end	Day	40% 10% 19% 25% 5%	6240
August	1st to 10th	Day	18% 9% 18% 43% 12%	4220
	11th to 20th	Day	22% 11% 36% 28% 3	3980
	21st to end	Day	39% 11% 18% 21% 10% 1	4281
September	1st to 10th	Day	41% 12% 15% 16% 12% 3	2200
	11th to 20th	Day	43% 9% 13% 19% 13% 2	2200
	21st to end	Day	34% 9% 13% 19% 16% 10%	2200
October	1st to 10th	Day	21% 4 7% 15% 18% 35%	3361
	11th to 20th	Day	22% 4 7% 19% 37% 11%	3240
	21st to end	Day	25% 4 6% 18% 36% 11%	3538
November	1st to 10th	Day	34% 7% 11% 20% 21% 8%	2058
	11th to 20th	Day	36% 6% 11% 15% 20% 12%	2100
	21st to end	Day	42% 6% 10% 17% 16% 9%	2100
December	1st to 10th	Day	51% 5% 7% 18% 15% 4	3030
	11th to 20th	Day	38% 7% 9% 18% 18% 10%	3479
	21st to end	Day	39% 6% 7% 17% 20% 12%	4587
January	1st to 10th	Night	43% 4 10% 16% 17% 9%	7635
	11th to 20th	Night	40% 4 4 17% 22% 13%	7680
	21st to end	Night	56% 3 5% 12% 15% 8%	8402
February	1st to 10th	Night	47% 5% 9% 10% 18% 12%	2656
	11th to 20th	Night	46% 4 8% 13% 17% 11%	2395
	21st to end	Night	47% 6% 7% 13% 18% 9%	1903
March	1st to 10th	Night	49% 5% 8% 15% 13% 10%	5029
	11th to 20th	Night	42% 6% 7% 13% 16% 15%	5090
	21st to end	Night	43% 4 9% 15% 21% 7%	5588
April	1st to 10th	Night	42% 6% 11% 17% 14% 9%	2211
	11th to 20th	Night	38% 6% 11% 18% 15% 13%	2005
	21st to end	Night	39% 7% 11% 21% 15% 7%	2000
May	1st to 10th	Night	53% 8% 10% 17% 9% 3	4520
	11th to 20th	Night	38% 6% 12% 24% 14% 5%	4082
	21st to end	Night	43% 9% 19% 22% 6% 1	4452
June	1st to 10th	Night	24% 6% 21% 32% 18%	1800
	11th to 20th	Night	25% 7% 17% 33% 16% 2	1800
	21st to end	Night	31% 10% 25% 24% 10%	1800
July	1st to 10th	Night	31% 7% 37% 23% 2	4035
	11th to 20th	Night	29% 9% 35% 24% 3	4026
	21st to end	Night	34% 11% 23% 28% 5%	4320
August	1st to 10th	Night	10% 6% 19% 51% 14%	2916
	11th to 20th	Night	16% 8% 38% 34% 4	3136
	21st to end	Night	27% 15% 22% 27% 9% 1	3609
September	1st to 10th	Night	32% 12% 22% 18% 12% 4	2200
	11th to 20th	Night	36% 10% 13% 22% 17% 2	2200
	21st to end	Night	29% 7% 14% 23% 19% 8%	2200
October	1st to 10th	Night	19% 4 8% 18% 19% 32%	3784
	11th to 20th	Night	16% 4 7% 23% 34% 16%	3899
	21st to end	Night	20% 4 6% 17% 38% 17%	4252
November	1st to 10th	Night	31% 5% 12% 21% 22% 10%	2460
	11th to 20th	Night	32% 5% 10% 20% 20% 12%	2520
	21st to end	Night	40% 4 10% 20% 18% 8%	2520
December	1st to 10th	Night	55% 4 7% 17% 12% 5%	4375
	11th to 20th	Night	41% 6% 9% 14% 17% 13%	4947
	21st to end	Night	40% 5% 6% 15% 26% 8%	6633

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	22% 11% 33% 24% 8% 1	330
	11th to 20th	Day	17% 12% 33% 31% 7% 1	330
	21st to end	Day	22% 14% 31% 25% 8%	363
February	1st to 10th	Day	22% 8% 37% 25% 8%	330
	11th to 20th	Day	23% 15% 30% 25% 5% 1	330
	21st to end	Day	20% 14% 40% 22% 4	273
March	1st to 10th	Day	19% 13% 36% 26% 6%	330
	11th to 20th	Day	15% 13% 43% 20% 6% 2	330
	21st to end	Day	15% 12% 34% 29% 10% 1	363
April	1st to 10th	Day	18% 15% 32% 26% 9%	303
	11th to 20th	Day	17% 13% 32% 24% 13% 2	462
	21st to end	Day	14% 8% 29% 32% 14% 1	500
May	1st to 10th	Day	15% 9% 28% 32% 15% 1	503
	11th to 20th	Day	11% 5% 24% 39% 18% 3	703
	21st to end	Day	9% 3 20% 43% 22% 3	789
June	1st to 10th	Day	6% 2 10% 39% 32% 11%	730
	11th to 20th	Day	7% 2 12% 37% 31% 12%	730
	21st to end	Day	9% 1 8% 28% 37% 17%	730
July	1st to 10th	Day	7% 2 4 25% 38% 23%	721
	11th to 20th	Day	6% 1 2 24% 40% 27%	718
	21st to end	Day	6% 1 3 23% 43% 25%	794
August	1st to 10th	Day	2 2 17% 48% 30%	726
	11th to 20th	Day	4 1 2 12% 46% 36%	576
	21st to end	Day	11% 2 6% 13% 35% 33%	566
September	1st to 10th	Day	12% 3 8% 18% 37% 23%	330
	11th to 20th	Day	11% 1 4 24% 41% 20%	330
	21st to end	Day	8% 2 4 25% 42% 18%	330
October	1st to 10th	Day	5% 2 5% 40% 37% 10%	330
	11th to 20th	Day	10% 4 12% 33% 31% 11%	330
	21st to end	Day	15% 7% 22% 29% 21% 5%	363
November	1st to 10th	Day	13% 4 20% 32% 25% 5%	330
	11th to 20th	Day	14% 6% 20% 39% 15% 5%	330
	21st to end	Day	16% 11% 31% 25% 13% 3	330
December	1st to 10th	Day	21% 8% 26% 27% 12% 5%	330
	11th to 20th	Day	16% 12% 29% 30% 11% 2	330
	21st to end	Day	16% 8% 32% 28% 14% 2	363
January	1st to 10th	Night	21% 7% 27% 33% 11%	1050
	11th to 20th	Night	20% 7% 30% 34% 9%	1050
	21st to end	Night	23% 8% 28% 33% 7%	1155
February	1st to 10th	Night	24% 8% 28% 32% 8%	976
	11th to 20th	Night	24% 8% 27% 32% 9%	761
	21st to end	Night	21% 10% 34% 29% 6%	519
March	1st to 10th	Night	23% 7% 27% 32% 10%	630
	11th to 20th	Night	16% 10% 27% 37% 10% 1	630
	21st to end	Night	16% 5% 26% 37% 15% 1	693
April	1st to 10th	Night	16% 8% 27% 39% 11%	603
	11th to 20th	Night	16% 10% 24% 35% 14%	593
	21st to end	Night	12% 6% 29% 37% 16% 1	600
May	1st to 10th	Night	13% 7% 25% 43% 12%	600
	11th to 20th	Night	10% 5% 18% 44% 21% 2	591
	21st to end	Night	6% 5% 14% 40% 32% 3	650
June	1st to 10th	Night	5% 2 4 37% 47% 5%	600
	11th to 20th	Night	5% 1 4 38% 46% 6%	600
	21st to end	Night	6% 1 6% 21% 53% 14%	600
July	1st to 10th	Night	7% 1 3 16% 55% 18%	585
	11th to 20th	Night	3 1 2 12% 60% 23%	582
	21st to end	Night	5% 1 1 13% 63% 17%	657
August	1st to 10th	Night	1 1 1 9% 67% 21%	597
	11th to 20th	Night	5% 1 9% 65% 20%	594
	21st to end	Night	5% 1 3 15% 53% 23%	660
September	1st to 10th	Night	6% 1 4 17% 53% 18%	600
	11th to 20th	Night	13% 1 5% 19% 47% 15%	600
	21st to end	Night	9% 1 6% 24% 49% 10%	600
October	1st to 10th	Night	5% 1 7% 33% 44% 9%	716
	11th to 20th	Night	9% 1 14% 36% 34% 5%	800
	21st to end	Night	10% 6% 15% 35% 29% 4	880
November	1st to 10th	Night	11% 4 15% 35% 30% 5%	820
	11th to 20th	Night	13% 4 19% 38% 25% 1	840
	21st to end	Night	15% 6% 26% 36% 15% 3	840
December	1st to 10th	Night	20% 7% 22% 32% 17% 2	1045
	11th to 20th	Night	20% 6% 26% 35% 13% 1	1050
	21st to end	Night	20% 7% 27% 33% 12% 1	1155

Page generated at 2026-03-30 01:18:39. Version ac07

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