Laguna Atascosa Wildlife Refuge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Laguna Atascosa Wildlife Refuge 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
Transparency	Day	34% 10% 18% 22% 13% 4	104948
	Night	35% 9% 18% 20% 13% 5%	103043
Seeing	Day	10% 4 16% 32% 30% 9%	14395
	Night	13% 4 14% 32% 30% 6%	24418

By Month

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	41% 10% 11% 16% 14% 7%	2848
	11th to 20th	Day	46% 11% 10% 13% 13% 7%	2882
	21st to end	Day	47% 11% 10% 12% 15% 5%	3487
February	1st to 10th	Day	46% 11% 9% 15% 13% 7%	1900
	11th to 20th	Day	38% 11% 13% 18% 15% 4	1859
	21st to end	Day	36% 11% 13% 21% 14% 6%	1655
March	1st to 10th	Day	49% 10% 15% 14% 10% 3	3436
	11th to 20th	Day	53% 9% 14% 12% 8% 4	3480
	21st to end	Day	26% 7% 12% 26% 18% 12%	3814
April	1st to 10th	Day	37% 9% 17% 19% 12% 6%	2090
	11th to 20th	Day	40% 10% 14% 19% 13% 5%	2066
	21st to end	Day	35% 10% 15% 19% 16% 6%	2204
May	1st to 10th	Day	28% 13% 25% 21% 9% 3	3982
	11th to 20th	Day	31% 13% 18% 21% 13% 4	4086
	21st to end	Day	20% 9% 19% 36% 16% 1	4489
June	1st to 10th	Day	22% 9% 19% 30% 19% 1	2470
	11th to 20th	Day	26% 11% 16% 27% 19% 2	2470
	21st to end	Day	33% 12% 21% 26% 7% 1	2470
July	1st to 10th	Day	33% 7% 28% 29% 3	4056
	11th to 20th	Day	39% 8% 31% 17% 5%	4051
	21st to end	Day	36% 9% 29% 24% 2	4325
August	1st to 10th	Day	11% 7% 29% 47% 6%	3913
	11th to 20th	Day	24% 8% 44% 22% 3	3705
	21st to end	Day	26% 10% 30% 26% 7% 1	3827
September	1st to 10th	Day	39% 12% 18% 19% 11%	2090
	11th to 20th	Day	42% 13% 15% 18% 10% 2	2090
	21st to end	Day	37% 11% 17% 20% 11% 4	2090
October	1st to 10th	Day	25% 6% 9% 18% 26% 16%	3480
	11th to 20th	Day	27% 6% 14% 18% 28% 6%	3236
	21st to end	Day	30% 6% 8% 22% 27% 7%	3428
November	1st to 10th	Day	33% 11% 11% 23% 18% 4	1958
	11th to 20th	Day	41% 11% 8% 16% 17% 7%	2000
	21st to end	Day	41% 11% 11% 18% 14% 4	1935
December	1st to 10th	Day	43% 11% 12% 19% 12% 4	1782
	11th to 20th	Day	39% 13% 12% 12% 15% 9%	2159
	21st to end	Day	45% 10% 9% 18% 15% 2	3135
January	1st to 10th	Night	42% 9% 12% 13% 16% 8%	4108
	11th to 20th	Night	46% 11% 9% 11% 16% 7%	4117
	21st to end	Night	52% 8% 8% 12% 13% 6%	4180
February	1st to 10th	Night	43% 11% 10% 14% 13% 8%	2280
	11th to 20th	Night	40% 12% 12% 17% 15% 4	2218
	21st to end	Night	38% 11% 8% 19% 17% 7%	1796
March	1st to 10th	Night	48% 10% 15% 15% 8% 3	3419
	11th to 20th	Night	57% 8% 14% 10% 8% 4	3480
	21st to end	Night	27% 6% 12% 24% 22% 10%	3817
April	1st to 10th	Night	41% 7% 16% 21% 11% 4	2090
	11th to 20th	Night	45% 8% 14% 15% 13% 6%	2063
	21st to end	Night	42% 9% 14% 16% 13% 6%	1972
May	1st to 10th	Night	39% 12% 22% 14% 9% 3	2977
	11th to 20th	Night	44% 12% 17% 16% 8% 2	2824
	21st to end	Night	33% 10% 19% 29% 9%	3099
June	1st to 10th	Night	20% 9% 21% 30% 17% 2	1710
	11th to 20th	Night	23% 10% 16% 33% 15% 3	1710
	21st to end	Night	27% 12% 27% 26% 7% 1	1710
July	1st to 10th	Night	31% 8% 32% 26% 3	2805
	11th to 20th	Night	33% 10% 36% 17% 3	2796
	21st to end	Night	30% 10% 36% 21% 3	2999
August	1st to 10th	Night	8% 5% 29% 49% 7%	2983
	11th to 20th	Night	22% 6% 46% 24% 2	3195
	21st to end	Night	17% 8% 38% 29% 7% 1	3828
September	1st to 10th	Night	32% 12% 22% 23% 10% 2	2090
	11th to 20th	Night	37% 11% 19% 23% 9% 1	2090
	21st to end	Night	30% 9% 19% 26% 13% 4	2090
October	1st to 10th	Night	21% 5% 9% 19% 26% 21%	3480
	11th to 20th	Night	23% 5% 14% 20% 25% 14%	3647
	21st to end	Night	26% 3 10% 26% 28% 6%	4120
November	1st to 10th	Night	27% 10% 14% 24% 19% 5%	2340
	11th to 20th	Night	37% 10% 11% 19% 14% 8%	2400
	21st to end	Night	36% 11% 15% 20% 12% 6%	2460
December	1st to 10th	Night	41% 11% 11% 19% 14% 4	2581
	11th to 20th	Night	35% 12% 13% 16% 13% 11%	3037
	21st to end	Night	45% 9% 10% 13% 16% 7%	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	20% 6% 27% 35% 10% 3	270
	11th to 20th	Day	18% 10% 28% 37% 6% 1	270
	21st to end	Day	20% 9% 34% 25% 11% 1	297
February	1st to 10th	Day	19% 7% 27% 34% 10% 2	270
	11th to 20th	Day	21% 9% 30% 29% 10% 1	270
	21st to end	Day	16% 8% 41% 30% 4	225
March	1st to 10th	Day	20% 8% 28% 36% 7% 1	270
	11th to 20th	Day	20% 9% 34% 29% 7%	270
	21st to end	Day	10% 10% 42% 33% 3	297
April	1st to 10th	Day	12% 7% 42% 31% 8%	270
	11th to 20th	Day	11% 12% 36% 32% 8% 1	264
	21st to end	Day	11% 7% 37% 34% 11% 1	384
May	1st to 10th	Day	8% 5% 37% 36% 13% 1	567
	11th to 20th	Day	9% 3 29% 44% 14% 1	675
	21st to end	Day	4 2 20% 53% 19% 3	734
June	1st to 10th	Day	2 1 9% 41% 39% 7%	680
	11th to 20th	Day	5% 1 5% 41% 43% 6%	680
	21st to end	Day	6% 1 6% 38% 35% 14%	680
July	1st to 10th	Day	7% 2 4 30% 47% 11%	671
	11th to 20th	Day	4 1 21% 56% 18%	668
	21st to end	Day	4 1 1 23% 55% 16%	739
August	1st to 10th	Day	1 2 22% 52% 23%	577
	11th to 20th	Day	1 1 1 19% 63% 15%	446
	21st to end	Day	3 1 2 17% 43% 34%	330
September	1st to 10th	Day	10% 1 4 21% 41% 23%	300
	11th to 20th	Day	6% 3 4 17% 41% 30%	300
	21st to end	Day	8% 1 3 21% 43% 24%	300
October	1st to 10th	Day	5% 2 4 27% 45% 17%	300
	11th to 20th	Day	10% 1 8% 26% 39% 17%	300
	21st to end	Day	14% 2 16% 35% 25% 8%	330
November	1st to 10th	Day	13% 3 10% 32% 34% 7%	300
	11th to 20th	Day	26% 4 10% 26% 26% 8%	300
	21st to end	Day	24% 7% 22% 24% 17% 7%	300
December	1st to 10th	Day	21% 4 20% 31% 18% 6%	294
	11th to 20th	Day	21% 8% 21% 33% 13% 4	270
	21st to end	Day	21% 8% 22% 38% 9% 3	297
January	1st to 10th	Night	24% 5% 19% 35% 16% 1	950
	11th to 20th	Night	22% 7% 20% 38% 13%	947
	21st to end	Night	21% 7% 21% 37% 14% 1	836
February	1st to 10th	Night	23% 5% 24% 34% 13%	760
	11th to 20th	Night	24% 8% 19% 36% 13%	744
	21st to end	Night	20% 7% 26% 39% 9%	540
March	1st to 10th	Night	17% 6% 28% 37% 12%	570
	11th to 20th	Night	19% 6% 24% 40% 12%	570
	21st to end	Night	13% 7% 25% 43% 11% 1	627
April	1st to 10th	Night	18% 6% 26% 40% 11%	570
	11th to 20th	Night	14% 6% 26% 40% 14%	563
	21st to end	Night	13% 5% 27% 42% 12% 1	570
May	1st to 10th	Night	13% 4 23% 46% 14%	570
	11th to 20th	Night	9% 3 21% 47% 19%	561
	21st to end	Night	8% 2 14% 45% 28% 2	617
June	1st to 10th	Night	2 1 5% 33% 52% 7%	570
	11th to 20th	Night	3 1 4 41% 45% 6%	570
	21st to end	Night	5% 1 5% 32% 42% 15%	570
July	1st to 10th	Night	7% 4 26% 51% 12%	555
	11th to 20th	Night	2 1 3 18% 60% 17%	552
	21st to end	Night	4 1 2 16% 65% 13%	624
August	1st to 10th	Night	1 1 16% 63% 19%	567
	11th to 20th	Night	3 1 1 13% 61% 22%	564
	21st to end	Night	4 1 3 10% 53% 29%	627
September	1st to 10th	Night	7% 1 13% 54% 24%	570
	11th to 20th	Night	11% 1 12% 51% 24%	570
	21st to end	Night	9% 3 16% 55% 17%	570
October	1st to 10th	Night	4 2 3 23% 53% 15%	570
	11th to 20th	Night	9% 1 6% 30% 46% 8%	680
	21st to end	Night	11% 2 12% 37% 34% 5%	836
November	1st to 10th	Night	11% 3 8% 34% 38% 6%	780
	11th to 20th	Night	20% 3 12% 29% 33% 3	800
	21st to end	Night	18% 4 17% 35% 24% 2	860
December	1st to 10th	Night	20% 6% 15% 33% 22% 4	993
	11th to 20th	Night	20% 7% 17% 35% 20% 2	950
	21st to end	Night	19% 5% 24% 35% 15% 2	1045

Page generated at 2024-12-06 02:54:46. Version ac07

Copyright © 2024 Attilla Danko.