Muleshoe NWR
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Muleshoe NWR clear sky chart from 2005-11-06 to 2026-01-17.

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	5% 4 1 4 3 3 3 3 5% 7% 62%	136509
	Night	5% 4 1 4 3 3 3 3 5% 7% 63%	132335
Transparency	Day	21% 4 8% 20% 27% 19%	131598
	Night	20% 4 8% 19% 27% 21%	128251
Seeing	Day	7% 6% 24% 33% 24% 7%	16719
	Night	6% 6% 33% 40% 14% 1	26802

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	8% 8% 2 5% 3 2 3 3 4 5% 57%	3930
	11th to 20th	Day	2 3 1 3 2 2 2 2 4 7% 72%	4476
	21st to end	Day	6% 5% 2 5% 4 4 4 3 5% 6% 56%	4994
February	1st to 10th	Day	4 6% 2 4 2 3 3 2 5% 5% 65%	2000
	11th to 20th	Day	6% 6% 2 5% 4 3 3 3 4 6% 58%	1949
	21st to end	Day	2 6% 2 5% 3 2 3 3 5% 6% 63%	1650
March	1st to 10th	Day	4 4 2 4 3 2 3 3 5% 6% 66%	4500
	11th to 20th	Day	8% 4 2 4 3 3 3 3 5% 7% 59%	4662
	21st to end	Day	2 4 1 5% 4 4 4 4 5% 7% 61%	5937
April	1st to 10th	Day	6% 3 1 3 3 2 3 3 4 5% 68%	2400
	11th to 20th	Day	6% 5% 2 4 2 2 3 3 3 5% 64%	2371
	21st to end	Day	5% 3 1 2 2 2 3 3 5% 6% 67%	2400
May	1st to 10th	Day	8% 3 1 3 2 3 3 3 5% 6% 62%	5665
	11th to 20th	Day	9% 3 1 3 2 2 3 3 4 6% 65%	5862
	21st to end	Day	8% 4 1 3 3 3 3 3 5% 6% 61%	6446
June	1st to 10th	Day	6% 3 2 4 3 3 4 3 6% 9% 59%	2600
	11th to 20th	Day	3 3 1 3 3 3 3 3 5% 8% 66%	2711
	21st to end	Day	4 4 1 3 3 4 5% 4 6% 9% 58%	2800
July	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 5% 6% 8% 47%	6339
	11th to 20th	Day	4 3 1 4 3 4 4 3 5% 9% 61%	6076
	21st to end	Day	3 2 1 4 4 4 5% 4 7% 10% 55%	6071
August	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 8% 65%	5348
	11th to 20th	Day	3 2 1 4 3 4 5% 4 7% 10% 57%	5366
	21st to end	Day	4 4 1 5% 3 4 4 4 5% 9% 57%	5984
September	1st to 10th	Day	7% 5% 2 4 4 4 5% 3 5% 7% 55%	2400
	11th to 20th	Day	9% 5% 2 5% 4 4 4 3 5% 8% 50%	2229
	21st to end	Day	7% 3 1 3 3 3 3 2 3 4 66%	2200
October	1st to 10th	Day	5% 2 1 3 1 1 2 1 3 4 76%	3590
	11th to 20th	Day	12% 4 1 3 2 2 2 2 3 4 65%	3426
	21st to end	Day	4 3 1 2 1 2 2 2 3 5% 75%	3396
November	1st to 10th	Day	5% 3 1 2 2 2 3 2 4 5% 70%	1853
	11th to 20th	Day	2 3 1 3 2 2 3 3 4 6% 70%	1890
	21st to end	Day	8% 6% 2 3 2 3 2 2 4 5% 64%	1890
December	1st to 10th	Day	5% 4 2 5% 3 3 4 3 5% 6% 61%	3030
	11th to 20th	Day	3 3 1 5% 3 3 3 3 4 6% 65%	3481
	21st to end	Day	4 4 1 4 2 2 2 2 3 4 72%	4587
January	1st to 10th	Night	4 6% 3 6% 3 3 4 3 4 5% 58%	6019
	11th to 20th	Night	2 2 1 3 2 2 3 2 4 6% 73%	5680
	21st to end	Night	4 5% 2 5% 3 3 4 3 5% 7% 58%	5984
February	1st to 10th	Night	5% 5% 2 4 3 3 3 2 5% 5% 64%	2400
	11th to 20th	Night	6% 4 2 4 3 3 3 2 5% 6% 61%	2338
	21st to end	Night	5% 4 1 3 3 3 4 3 4 6% 64%	1980
March	1st to 10th	Night	3 4 2 3 2 3 3 2 4 6% 68%	5374
	11th to 20th	Night	6% 3 2 3 2 2 3 2 4 6% 65%	5310
	21st to end	Night	2 3 1 3 3 3 3 3 5% 7% 66%	4998
April	1st to 10th	Night	5% 4 1 3 2 2 3 3 5% 6% 67%	2000
	11th to 20th	Night	6% 4 1 4 3 4 3 3 5% 6% 63%	1977
	21st to end	Night	6% 3 1 3 2 2 3 4 5% 5% 66%	2000
May	1st to 10th	Night	8% 3 1 3 1 2 2 2 4 6% 67%	4314
	11th to 20th	Night	6% 3 1 4 3 3 3 3 4 5% 65%	4053
	21st to end	Night	7% 4 1 3 2 2 3 3 4 6% 65%	4451
June	1st to 10th	Night	4 3 1 4 3 3 4 5% 8% 10% 55%	1800
	11th to 20th	Night	2 2 1 3 3 3 3 4 6% 9% 66%	1680
	21st to end	Night	3 4 2 4 4 3 4 3 5% 10% 60%	1600
July	1st to 10th	Night	6% 6% 2 6% 4 4 4 4 5% 9% 51%	3640
	11th to 20th	Night	2 3 1 5% 3 4 4 4 6% 11% 56%	3899
	21st to end	Night	3 2 1 4 4 4 5% 4 8% 15% 49%	4783
August	1st to 10th	Night	2 2 1 3 3 3 4 4 7% 13% 57%	4464
	11th to 20th	Night	3 3 1 5% 5% 4 5% 4 7% 10% 50%	4483
	21st to end	Night	5% 4 2 5% 3 4 4 4 8% 11% 52%	4993
September	1st to 10th	Night	6% 4 2 5% 3 4 4 3 6% 7% 55%	2000
	11th to 20th	Night	7% 4 2 5% 4 4 4 3 6% 7% 56%	2170
	21st to end	Night	7% 3 1 4 2 3 3 3 4 6% 66%	2200
October	1st to 10th	Night	4 2 1 2 2 2 2 2 3 5% 77%	3590
	11th to 20th	Night	13% 3 1 3 2 2 2 2 3 5% 65%	3700
	21st to end	Night	5% 2 1 2 2 2 2 2 3 5% 74%	4371
November	1st to 10th	Night	5% 3 1 2 1 2 2 3 4 6% 73%	2665
	11th to 20th	Night	2 3 1 3 2 3 2 2 4 7% 71%	2730
	21st to end	Night	7% 4 1 3 3 2 3 3 4 7% 63%	2730
December	1st to 10th	Night	5% 5% 2 5% 3 3 3 2 4 6% 61%	4380
	11th to 20th	Night	3 3 1 4 2 3 3 2 5% 6% 68%	4946
	21st to end	Night	3 4 2 4 3 3 3 2 3 5% 68%	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	30% 2 6% 20% 31% 12%	3931
	11th to 20th	Day	13% 2 6% 23% 36% 20%	4476
	21st to end	Day	28% 3 6% 18% 29% 15%	4994
February	1st to 10th	Day	23% 3 7% 19% 27% 22%	2000
	11th to 20th	Day	28% 3 5% 19% 26% 19%	1959
	21st to end	Day	23% 3 3 12% 35% 24%	1650
March	1st to 10th	Day	20% 3 3 8% 31% 35%	4500
	11th to 20th	Day	24% 4 6% 14% 27% 26%	4662
	21st to end	Day	20% 5% 7% 18% 30% 21%	5937
April	1st to 10th	Day	18% 4 5% 14% 32% 26%	2400
	11th to 20th	Day	23% 3 5% 17% 25% 26%	2374
	21st to end	Day	17% 4 7% 21% 30% 21%	2400
May	1st to 10th	Day	22% 4 10% 18% 22% 24%	5665
	11th to 20th	Day	20% 4 7% 14% 22% 34%	5866
	21st to end	Day	23% 5% 10% 15% 17% 30%	6447
June	1st to 10th	Day	22% 5% 14% 27% 20% 12%	2600
	11th to 20th	Day	17% 5% 8% 20% 27% 24%	2711
	21st to end	Day	22% 6% 11% 24% 23% 14%	2800
July	1st to 10th	Day	33% 8% 10% 22% 22% 6%	6271
	11th to 20th	Day	19% 6% 13% 36% 22% 4	6003
	21st to end	Day	20% 8% 17% 31% 21% 3	5897
August	1st to 10th	Day	14% 6% 12% 29% 27% 12%	3892
	11th to 20th	Day	17% 5% 12% 21% 31% 13%	3882
	21st to end	Day	23% 5% 14% 27% 25% 6%	4311
September	1st to 10th	Day	28% 7% 12% 19% 22% 12%	2400
	11th to 20th	Day	31% 6% 8% 21% 25% 9%	2229
	21st to end	Day	23% 4 6% 19% 32% 16%	2200
October	1st to 10th	Day	14% 2 5% 12% 32% 34%	3590
	11th to 20th	Day	24% 3 7% 14% 27% 25%	3426
	21st to end	Day	14% 2 3 21% 33% 27%	3396
November	1st to 10th	Day	17% 4 6% 16% 36% 21%	1853
	11th to 20th	Day	17% 3 5% 21% 34% 20%	1890
	21st to end	Day	23% 2 5% 16% 31% 22%	1890
December	1st to 10th	Day	23% 4 6% 25% 25% 17%	3030
	11th to 20th	Day	21% 2 5% 17% 35% 20%	3479
	21st to end	Day	18% 2 5% 23% 34% 18%	4587
January	1st to 10th	Night	27% 4 4 23% 32% 10%	6019
	11th to 20th	Night	13% 3 9% 20% 37% 18%	5680
	21st to end	Night	24% 4 8% 20% 27% 18%	5984
February	1st to 10th	Night	23% 3 5% 17% 28% 25%	2400
	11th to 20th	Night	26% 3 6% 19% 26% 21%	2338
	21st to end	Night	22% 3 5% 13% 27% 31%	1980
March	1st to 10th	Night	18% 3 4 10% 26% 38%	5374
	11th to 20th	Night	21% 3 6% 15% 19% 36%	5310
	21st to end	Night	17% 4 9% 17% 27% 26%	4998
April	1st to 10th	Night	19% 3 7% 16% 28% 28%	2000
	11th to 20th	Night	21% 5% 8% 16% 25% 26%	1977
	21st to end	Night	18% 4 9% 20% 27% 22%	2000
May	1st to 10th	Night	20% 3 11% 20% 20% 26%	4311
	11th to 20th	Night	20% 4 8% 12% 23% 32%	4054
	21st to end	Night	21% 5% 11% 14% 13% 36%	4452
June	1st to 10th	Night	20% 8% 15% 26% 18% 13%	1800
	11th to 20th	Night	14% 5% 11% 20% 27% 23%	1680
	21st to end	Night	20% 5% 15% 25% 20% 15%	1600
July	1st to 10th	Night	30% 7% 14% 28% 19% 3	3600
	11th to 20th	Night	21% 5% 15% 31% 24% 4	3850
	21st to end	Night	21% 8% 18% 31% 20% 3	4644
August	1st to 10th	Night	18% 6% 12% 27% 25% 11%	3244
	11th to 20th	Night	19% 6% 9% 25% 32% 8%	3243
	21st to end	Night	23% 6% 16% 25% 24% 6%	3597
September	1st to 10th	Night	27% 7% 11% 20% 22% 13%	2000
	11th to 20th	Night	27% 5% 12% 22% 24% 10%	2170
	21st to end	Night	21% 4 7% 20% 31% 18%	2200
October	1st to 10th	Night	13% 4 6% 11% 29% 38%	3590
	11th to 20th	Night	24% 3 5% 17% 26% 25%	3700
	21st to end	Night	15% 2 3 17% 35% 28%	4371
November	1st to 10th	Night	15% 2 6% 19% 33% 26%	2665
	11th to 20th	Night	14% 3 5% 18% 39% 21%	2730
	21st to end	Night	22% 3 5% 18% 35% 18%	2730
December	1st to 10th	Night	24% 4 6% 21% 33% 13%	4380
	11th to 20th	Night	18% 2 4 14% 38% 24%	4947
	21st to end	Night	20% 3 5% 20% 36% 18%	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	10% 12% 35% 31% 11% 2	330
	11th to 20th	Day	8% 11% 34% 33% 12% 2	318
	21st to end	Day	7% 10% 35% 33% 14% 2	330
February	1st to 10th	Day	6% 9% 42% 33% 11%	300
	11th to 20th	Day	11% 11% 39% 29% 8% 2	300
	21st to end	Day	8% 10% 46% 27% 8%	249
March	1st to 10th	Day	7% 7% 42% 32% 12%	300
	11th to 20th	Day	14% 10% 34% 27% 12% 3	300
	21st to end	Day	7% 15% 37% 30% 9% 1	531
April	1st to 10th	Day	9% 12% 40% 30% 8%	500
	11th to 20th	Day	9% 12% 46% 27% 6% 1	492
	21st to end	Day	6% 12% 35% 33% 13% 1	500
May	1st to 10th	Day	6% 9% 37% 35% 13% 1	598
	11th to 20th	Day	9% 8% 29% 31% 20% 4	725
	21st to end	Day	8% 6% 29% 36% 20% 2	789
June	1st to 10th	Day	6% 3 21% 42% 23% 4	730
	11th to 20th	Day	3 2 20% 47% 23% 5%	730
	21st to end	Day	5% 1 12% 40% 35% 7%	730
July	1st to 10th	Day	6% 1 7% 29% 39% 16%	721
	11th to 20th	Day	3 4 31% 47% 15%	718
	21st to end	Day	2 1 5% 25% 45% 22%	646
August	1st to 10th	Day	3 7% 28% 46% 16%	527
	11th to 20th	Day	5% 1 6% 28% 42% 20%	517
	21st to end	Day	5% 1 6% 27% 40% 21%	583
September	1st to 10th	Day	7% 2 7% 35% 35% 13%	530
	11th to 20th	Day	5% 1 9% 33% 38% 14%	359
	21st to end	Day	11% 3 12% 30% 33% 11%	330
October	1st to 10th	Day	14% 3 16% 35% 24% 9%	330
	11th to 20th	Day	9% 3 21% 38% 21% 7%	330
	21st to end	Day	9% 7% 23% 31% 23% 7%	363
November	1st to 10th	Day	10% 8% 30% 30% 18% 4	330
	11th to 20th	Day	3 11% 25% 37% 19% 5%	330
	21st to end	Day	12% 13% 35% 21% 15% 4	330
December	1st to 10th	Day	8% 7% 38% 31% 13% 3	330
	11th to 20th	Day	5% 8% 31% 43% 12% 1	330
	21st to end	Day	7% 10% 41% 31% 10% 2	363
January	1st to 10th	Night	7% 8% 38% 38% 9%	1050
	11th to 20th	Night	5% 7% 40% 37% 10% 1	901
	21st to end	Night	6% 6% 41% 38% 9%	880
February	1st to 10th	Night	6% 8% 44% 35% 7%	800
	11th to 20th	Night	8% 9% 46% 31% 5%	784
	21st to end	Night	9% 10% 46% 32% 3	660
March	1st to 10th	Night	7% 10% 46% 32% 5%	800
	11th to 20th	Night	9% 13% 40% 32% 7%	748
	21st to end	Night	5% 12% 48% 31% 4	660
April	1st to 10th	Night	6% 13% 47% 31% 4	600
	11th to 20th	Night	7% 9% 54% 29% 2	593
	21st to end	Night	6% 9% 49% 32% 5%	600
May	1st to 10th	Night	5% 8% 46% 36% 5%	600
	11th to 20th	Night	7% 6% 38% 37% 11% 1	591
	21st to end	Night	6% 5% 40% 39% 9%	650
June	1st to 10th	Night	4 4 32% 50% 10%	600
	11th to 20th	Night	2 3 38% 50% 9%	600
	21st to end	Night	4 26% 51% 19%	600
July	1st to 10th	Night	6% 1 12% 50% 30% 1	585
	11th to 20th	Night	3 1 8% 51% 36% 1	582
	21st to end	Night	2 1 5% 49% 41% 2	657
August	1st to 10th	Night	3 1 6% 48% 40% 1	597
	11th to 20th	Night	4 1 9% 48% 36% 2	594
	21st to end	Night	5% 1 9% 46% 39% 1	660
September	1st to 10th	Night	6% 2 11% 47% 33% 1	600
	11th to 20th	Night	7% 1 16% 53% 23% 1	600
	21st to end	Night	7% 2 19% 50% 22% 1	600
October	1st to 10th	Night	7% 4 25% 48% 17% 1	600
	11th to 20th	Night	9% 3 31% 43% 13% 1	680
	21st to end	Night	8% 5% 28% 37% 20% 2	950
November	1st to 10th	Night	6% 5% 27% 46% 15% 1	1025
	11th to 20th	Night	3 6% 32% 43% 16% 1	1050
	21st to end	Night	9% 7% 33% 37% 13% 1	1050
December	1st to 10th	Night	9% 7% 36% 39% 9%	1050
	11th to 20th	Night	7% 7% 40% 38% 8%	1050
	21st to end	Night	9% 9% 38% 35% 8% 1	1155

Page generated at 2026-01-14 00:14:25. Version ac07

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