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 2024-12-09.

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% 7% 2 6% 5% 5% 5% 4 7% 9% 38%	101311
	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	98535
Transparency	Day	39% 8% 14% 19% 14% 6%	104998
	Night	36% 7% 13% 20% 16% 8%	102975
Seeing	Day	12% 5% 17% 28% 26% 12%	14884
	Night	14% 5% 18% 31% 27% 6%	24753

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% 2 6% 4 3 4 3 4 7% 38%	2847
	11th to 20th	Day	13% 7% 2 5% 4 3 3 3 4 7% 50%	2850
	21st to end	Day	24% 8% 3 7% 4 3 4 3 6% 7% 32%	3135
February	1st to 10th	Day	20% 10% 3 7% 4 4 4 4 5% 5% 34%	1790
	11th to 20th	Day	22% 10% 2 5% 4 4 3 3 5% 5% 37%	1903
	21st to end	Day	21% 9% 2 5% 5% 4 3 3 4 7% 37%	1727
March	1st to 10th	Day	19% 8% 3 8% 5% 5% 5% 4 7% 8% 28%	3436
	11th to 20th	Day	17% 8% 3 9% 6% 6% 6% 5% 6% 7% 29%	3480
	21st to end	Day	16% 6% 2 6% 4 4 4 3 5% 6% 43%	3814
April	1st to 10th	Day	16% 9% 2 8% 4 4 3 4 6% 8% 37%	2090
	11th to 20th	Day	16% 8% 2 7% 5% 5% 4 3 6% 6% 38%	2225
	21st to end	Day	11% 7% 2 6% 4 5% 5% 5% 5% 6% 44%	2280
May	1st to 10th	Day	15% 8% 3 9% 6% 6% 5% 5% 7% 7% 29%	3765
	11th to 20th	Day	14% 7% 2 7% 5% 4 5% 3 6% 7% 40%	4048
	21st to end	Day	7% 6% 2 6% 6% 6% 6% 6% 9% 11% 34%	4477
June	1st to 10th	Day	5% 5% 2 6% 5% 6% 5% 5% 9% 10% 43%	2470
	11th to 20th	Day	5% 4 1 6% 4 6% 7% 7% 9% 12% 38%	2470
	21st to end	Day	9% 5% 2 5% 6% 7% 8% 6% 9% 12% 31%	2470
July	1st to 10th	Day	8% 6% 2 7% 5% 6% 6% 5% 10% 13% 33%	4120
	11th to 20th	Day	6% 8% 4 10% 9% 7% 8% 6% 9% 10% 24%	4120
	21st to end	Day	12% 8% 3 8% 6% 6% 6% 5% 8% 10% 28%	4465
August	1st to 10th	Day	2 2 1 3 3 4 5% 5% 8% 12% 57%	4104
	11th to 20th	Day	3 2 1 4 4 4 6% 6% 9% 15% 46%	3819
	21st to end	Day	7% 4 2 7% 6% 6% 7% 5% 8% 11% 36%	4151
September	1st to 10th	Day	9% 7% 2 7% 6% 6% 7% 5% 8% 10% 32%	2090
	11th to 20th	Day	15% 7% 2 7% 5% 6% 6% 5% 6% 7% 34%	2090
	21st to end	Day	10% 5% 2 6% 4 5% 4 4 7% 9% 44%	2090
October	1st to 10th	Day	7% 5% 2 5% 3 4 4 4 6% 8% 52%	1959
	11th to 20th	Day	11% 5% 2 4 3 3 3 3 6% 7% 52%	1900
	21st to end	Day	11% 4 2 4 4 3 3 3 5% 6% 54%	2090
November	1st to 10th	Day	11% 5% 2 5% 5% 5% 5% 4 6% 8% 44%	1958
	11th to 20th	Day	14% 5% 2 5% 4 5% 4 4 4 7% 47%	2000
	21st to end	Day	15% 7% 2 6% 4 5% 3 3 5% 5% 44%	2000
December	1st to 10th	Day	16% 8% 2 6% 4 3 4 4 5% 8% 39%	1782
	11th to 20th	Day	12% 8% 2 7% 5% 5% 5% 3 6% 7% 40%	2161
	21st to end	Day	16% 7% 2 5% 4 4 4 3 5% 7% 42%	3135
January	1st to 10th	Night	21% 9% 2 6% 3 4 4 3 5% 6% 37%	4108
	11th to 20th	Night	17% 7% 2 6% 3 3 3 2 3 6% 48%	4120
	21st to end	Night	24% 10% 3 6% 3 3 3 3 5% 7% 34%	4532
February	1st to 10th	Night	19% 9% 3 7% 4 3 4 4 4 6% 38%	2404
	11th to 20th	Night	20% 9% 3 5% 4 2 3 3 4 5% 43%	2161
	21st to end	Night	19% 9% 3 6% 4 4 3 3 3 5% 40%	1727
March	1st to 10th	Night	25% 11% 3 6% 4 3 4 3 5% 7% 29%	3419
	11th to 20th	Night	20% 10% 3 7% 6% 4 5% 4 5% 7% 29%	3480
	21st to end	Night	12% 6% 2 5% 4 4 4 4 5% 6% 47%	3817
April	1st to 10th	Night	14% 7% 3 7% 4 4 4 3 6% 8% 39%	2090
	11th to 20th	Night	17% 7% 2 5% 4 4 4 4 5% 7% 42%	1904
	21st to end	Night	12% 5% 3 6% 5% 5% 5% 4 6% 7% 43%	1900
May	1st to 10th	Night	25% 9% 3 7% 4 4 4 3 5% 7% 28%	3130
	11th to 20th	Night	13% 7% 2 6% 5% 4 4 4 6% 7% 42%	2838
	21st to end	Night	13% 7% 2 7% 5% 4 4 5% 8% 11% 34%	3090
June	1st to 10th	Night	5% 4 1 4 3 3 4 4 6% 11% 55%	1710
	11th to 20th	Night	6% 3 1 4 5% 4 4 4 7% 11% 52%	1710
	21st to end	Night	5% 4 2 6% 5% 5% 5% 5% 8% 12% 42%	1710
July	1st to 10th	Night	6% 6% 2 5% 4 4 4 4 7% 12% 46%	2850
	11th to 20th	Night	3 4 2 6% 5% 6% 6% 5% 10% 12% 41%	2850
	21st to end	Night	8% 6% 3 8% 5% 6% 5% 4 8% 10% 37%	3098
August	1st to 10th	Night	1 2 2 2 3 2 5% 9% 73%	2836
	11th to 20th	Night	2 2 1 2 3 2 4 4 7% 16% 57%	3011
	21st to end	Night	4 3 1 5% 4 5% 5% 4 8% 13% 48%	3498
September	1st to 10th	Night	5% 5% 2 7% 5% 5% 5% 5% 9% 11% 42%	2090
	11th to 20th	Night	11% 6% 2 6% 4 4 5% 4 7% 7% 44%	2090
	21st to end	Night	8% 4 3 5% 4 4 4 3 5% 8% 54%	2090
October	1st to 10th	Night	5% 4 2 5% 4 3 4 3 4 6% 60%	2200
	11th to 20th	Night	9% 4 2 4 2 3 3 3 5% 6% 61%	2280
	21st to end	Night	10% 5% 2 4 4 2 3 3 4 4 61%	2508
November	1st to 10th	Night	9% 6% 2 6% 4 3 3 3 5% 6% 53%	2340
	11th to 20th	Night	13% 4 2 4 4 4 4 3 5% 6% 51%	2400
	21st to end	Night	14% 6% 3 6% 5% 4 4 3 5% 5% 46%	2400
December	1st to 10th	Night	18% 8% 2 6% 4 3 4 3 4 6% 41%	2576
	11th to 20th	Night	15% 8% 3 6% 4 4 3 4 5% 6% 41%	3036
	21st to end	Night	16% 7% 3 7% 4 4 4 3 4 6% 43%	4532

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% 5% 5% 16% 19% 9%	2848
	11th to 20th	Day	34% 8% 6% 24% 16% 11%	2850
	21st to end	Day	52% 3 5% 15% 16% 9%	3135
February	1st to 10th	Day	51% 5% 7% 13% 14% 10%	1790
	11th to 20th	Day	50% 5% 9% 11% 17% 8%	1913
	21st to end	Day	48% 7% 9% 13% 14% 8%	1727
March	1st to 10th	Day	51% 11% 12% 12% 11% 3	3436
	11th to 20th	Day	52% 8% 12% 10% 13% 5%	3480
	21st to end	Day	40% 6% 12% 17% 21% 5%	3814
April	1st to 10th	Day	45% 8% 8% 17% 14% 8%	2090
	11th to 20th	Day	45% 6% 11% 15% 14% 8%	2225
	21st to end	Day	38% 8% 11% 19% 19% 5%	2280
May	1st to 10th	Day	49% 11% 14% 14% 9% 4	3800
	11th to 20th	Day	41% 7% 11% 18% 19% 4	4052
	21st to end	Day	36% 14% 14% 28% 7% 1	4489
June	1st to 10th	Day	31% 10% 19% 25% 15%	2470
	11th to 20th	Day	32% 11% 18% 26% 12% 1	2470
	21st to end	Day	38% 14% 19% 22% 8%	2470
July	1st to 10th	Day	37% 10% 32% 18% 3	4056
	11th to 20th	Day	48% 13% 20% 15% 4	4051
	21st to end	Day	47% 11% 19% 20% 2	4325
August	1st to 10th	Day	17% 8% 18% 44% 13%	4090
	11th to 20th	Day	22% 11% 37% 27% 3	3857
	21st to end	Day	38% 11% 18% 22% 10% 1	4150
September	1st to 10th	Day	42% 12% 15% 16% 12% 3	2090
	11th to 20th	Day	44% 9% 13% 17% 13% 2	2090
	21st to end	Day	34% 9% 13% 18% 16% 10%	2090
October	1st to 10th	Day	22% 4 7% 15% 17% 36%	3258
	11th to 20th	Day	22% 4 7% 19% 36% 11%	3140
	21st to end	Day	25% 4 6% 18% 37% 11%	3428
November	1st to 10th	Day	35% 7% 11% 19% 20% 7%	1958
	11th to 20th	Day	37% 6% 11% 14% 20% 13%	2000
	21st to end	Day	42% 5% 9% 17% 17% 9%	2000
December	1st to 10th	Day	42% 7% 10% 20% 14% 6%	1782
	11th to 20th	Day	41% 7% 9% 14% 18% 9%	2159
	21st to end	Day	41% 6% 8% 15% 19% 11%	3135
January	1st to 10th	Night	47% 5% 7% 13% 15% 13%	4108
	11th to 20th	Night	39% 5% 6% 16% 23% 12%	4120
	21st to end	Night	50% 3 6% 14% 17% 10%	4532
February	1st to 10th	Night	48% 5% 9% 10% 17% 12%	2404
	11th to 20th	Night	45% 4 9% 13% 17% 12%	2161
	21st to end	Night	48% 5% 7% 13% 17% 9%	1727
March	1st to 10th	Night	54% 6% 11% 14% 10% 5%	3419
	11th to 20th	Night	54% 8% 10% 13% 11% 5%	3480
	21st to end	Night	36% 5% 12% 14% 25% 7%	3817
April	1st to 10th	Night	43% 7% 11% 17% 14% 9%	2090
	11th to 20th	Night	40% 6% 11% 17% 14% 12%	1904
	21st to end	Night	39% 6% 10% 21% 16% 7%	1900
May	1st to 10th	Night	51% 9% 11% 14% 9% 5%	3160
	11th to 20th	Night	39% 6% 11% 19% 17% 7%	2839
	21st to end	Night	39% 9% 19% 26% 7% 1	3099
June	1st to 10th	Night	24% 6% 21% 31% 18%	1710
	11th to 20th	Night	26% 7% 16% 33% 17% 2	1710
	21st to end	Night	32% 9% 23% 25% 10%	1710
July	1st to 10th	Night	31% 8% 34% 25% 3	2805
	11th to 20th	Night	32% 11% 31% 22% 4	2796
	21st to end	Night	40% 12% 25% 20% 3	2999
August	1st to 10th	Night	10% 6% 18% 51% 14%	2826
	11th to 20th	Night	16% 8% 38% 34% 4	3039
	21st to end	Night	26% 15% 22% 27% 9% 1	3498
September	1st to 10th	Night	32% 11% 23% 18% 13% 3	2090
	11th to 20th	Night	37% 10% 13% 21% 16% 3	2090
	21st to end	Night	29% 7% 14% 23% 19% 9%	2090
October	1st to 10th	Night	20% 4 7% 18% 17% 33%	3668
	11th to 20th	Night	16% 4 7% 22% 34% 16%	3779
	21st to end	Night	20% 3 6% 17% 38% 16%	4120
November	1st to 10th	Night	32% 5% 12% 21% 20% 9%	2340
	11th to 20th	Night	34% 6% 10% 19% 20% 12%	2400
	21st to end	Night	40% 4 10% 20% 18% 8%	2400
December	1st to 10th	Night	44% 5% 9% 20% 14% 8%	2576
	11th to 20th	Night	43% 6% 8% 13% 17% 14%	3037
	21st to end	Night	43% 6% 7% 13% 23% 8%	4532

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% 8% 34% 26% 9% 1	270
	11th to 20th	Day	18% 10% 33% 31% 7% 1	270
	21st to end	Day	20% 11% 33% 27% 9%	297
February	1st to 10th	Day	24% 9% 36% 22% 8%	270
	11th to 20th	Day	23% 13% 30% 28% 5% 1	270
	21st to end	Day	21% 15% 41% 21% 2	225
March	1st to 10th	Day	19% 10% 39% 26% 6%	270
	11th to 20th	Day	18% 10% 45% 20% 5% 2	270
	21st to end	Day	16% 12% 37% 28% 7%	297
April	1st to 10th	Day	18% 13% 34% 26% 8%	270
	11th to 20th	Day	18% 14% 30% 23% 13% 2	423
	21st to end	Day	13% 8% 29% 33% 15% 2	460
May	1st to 10th	Day	14% 8% 27% 33% 16% 1	463
	11th to 20th	Day	11% 5% 21% 40% 20% 3	654
	21st to end	Day	8% 3 20% 44% 23% 3	734
June	1st to 10th	Day	6% 2 9% 38% 33% 11%	680
	11th to 20th	Day	7% 1 11% 36% 32% 13%	680
	21st to end	Day	10% 1 8% 27% 37% 17%	680
July	1st to 10th	Day	8% 2 4 24% 39% 24%	671
	11th to 20th	Day	6% 1 2 23% 40% 29%	668
	21st to end	Day	6% 1 3 22% 43% 25%	739
August	1st to 10th	Day	2 2 17% 48% 30%	676
	11th to 20th	Day	4 1 1 11% 46% 37%	533
	21st to end	Day	10% 2 6% 14% 35% 33%	523
September	1st to 10th	Day	12% 3 8% 18% 35% 25%	300
	11th to 20th	Day	11% 1 4 22% 41% 21%	300
	21st to end	Day	9% 2 3 25% 42% 19%	300
October	1st to 10th	Day	6% 3 6% 39% 37% 9%	300
	11th to 20th	Day	11% 4 11% 33% 29% 11%	300
	21st to end	Day	16% 7% 22% 29% 21% 6%	330
November	1st to 10th	Day	15% 4 19% 33% 24% 5%	300
	11th to 20th	Day	15% 6% 20% 38% 16% 5%	300
	21st to end	Day	17% 11% 31% 24% 13% 4	300
December	1st to 10th	Day	20% 7% 26% 28% 14% 6%	294
	11th to 20th	Day	17% 14% 31% 29% 7% 1	270
	21st to end	Day	18% 8% 32% 28% 13% 2	297
January	1st to 10th	Night	22% 7% 26% 34% 11%	950
	11th to 20th	Night	20% 6% 30% 34% 10% 1	950
	21st to end	Night	22% 8% 27% 35% 8%	1045
February	1st to 10th	Night	24% 8% 29% 31% 7%	884
	11th to 20th	Night	24% 8% 27% 33% 9%	687
	21st to end	Night	22% 10% 34% 28% 6%	471
March	1st to 10th	Night	22% 7% 27% 33% 11%	570
	11th to 20th	Night	16% 10% 27% 37% 10% 1	570
	21st to end	Night	15% 5% 28% 37% 14% 1	627
April	1st to 10th	Night	15% 8% 28% 39% 10%	570
	11th to 20th	Night	17% 10% 24% 35% 14%	563
	21st to end	Night	13% 5% 29% 36% 16% 1	570
May	1st to 10th	Night	12% 7% 25% 43% 12%	570
	11th to 20th	Night	10% 5% 17% 44% 21% 2	561
	21st to end	Night	5% 5% 14% 41% 33% 3	617
June	1st to 10th	Night	5% 2 4 37% 47% 5%	570
	11th to 20th	Night	5% 1 4 37% 47% 6%	570
	21st to end	Night	6% 1 6% 22% 52% 13%	570
July	1st to 10th	Night	7% 1 3 17% 54% 18%	555
	11th to 20th	Night	3 3 12% 59% 24%	552
	21st to end	Night	5% 1 1 13% 63% 17%	624
August	1st to 10th	Night	1 1 1 9% 67% 21%	567
	11th to 20th	Night	5% 1 9% 65% 20%	564
	21st to end	Night	6% 1 3 16% 53% 22%	627
September	1st to 10th	Night	6% 1 4 16% 54% 19%	570
	11th to 20th	Night	14% 1 5% 19% 45% 15%	570
	21st to end	Night	9% 1 7% 23% 49% 11%	570
October	1st to 10th	Night	6% 1 7% 33% 45% 9%	680
	11th to 20th	Night	10% 1 15% 36% 34% 5%	760
	21st to end	Night	11% 6% 15% 36% 28% 4	836
November	1st to 10th	Night	11% 3 16% 37% 29% 4	780
	11th to 20th	Night	14% 4 20% 37% 24% 1	800
	21st to end	Night	15% 6% 26% 36% 15% 3	800
December	1st to 10th	Night	19% 7% 22% 32% 17% 2	988
	11th to 20th	Night	21% 6% 26% 34% 11% 1	950
	21st to end	Night	21% 8% 27% 33% 11% 1	1045

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