Las Animas
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Las Animas clear sky chart from 2005-11-06 to 2025-01-07.

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	4 4 1 4 3 3 3 3 5% 7% 62%	108789
	Night	5% 5% 2 5% 3 3 4 3 6% 7% 57%	108968
Transparency	Day	21% 4 10% 25% 27% 13%	108531
	Night	26% 4 10% 24% 25% 11%	108817
Seeing	Day	7% 6% 22% 33% 24% 9%	15700
	Night	7% 5% 31% 43% 13% 1	25778

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	3 6% 3 5% 3 4 3 3 5% 6% 58%	2586
	11th to 20th	Day	3 4 1 4 3 5% 6% 4 5% 8% 55%	2540
	21st to end	Day	4 5% 2 5% 4 4 3 3 4 7% 58%	3124
February	1st to 10th	Day	5% 8% 2 5% 4 4 3 4 4 6% 55%	1876
	11th to 20th	Day	2 5% 3 6% 4 4 3 3 5% 7% 58%	1849
	21st to end	Day	4 4 2 5% 4 3 4 3 4 6% 61%	1570
March	1st to 10th	Day	3 4 2 4 4 3 3 3 4 6% 66%	3130
	11th to 20th	Day	8% 4 1 4 3 3 3 3 4 6% 60%	3255
	21st to end	Day	5% 5% 1 4 4 4 4 4 5% 7% 57%	4165
April	1st to 10th	Day	6% 4 1 3 3 3 3 3 5% 7% 62%	2280
	11th to 20th	Day	8% 5% 2 4 3 3 4 4 5% 8% 56%	2251
	21st to end	Day	7% 5% 2 4 3 4 4 4 5% 8% 53%	2280
May	1st to 10th	Day	7% 5% 1 4 3 3 3 3 5% 7% 59%	4116
	11th to 20th	Day	5% 4 2 4 3 3 4 4 6% 8% 57%	4082
	21st to end	Day	4 3 1 3 3 2 3 3 6% 7% 65%	4724
June	1st to 10th	Day	4 1 1 3 3 3 3 4 8% 11% 57%	2660
	11th to 20th	Day	5% 2 1 3 3 3 3 3 6% 7% 65%	2660
	21st to end	Day	4 3 1 3 4 4 5% 4 7% 10% 56%	2660
July	1st to 10th	Day	5% 2 1 4 3 4 4 4 6% 8% 58%	4430
	11th to 20th	Day	2 1 1 2 2 3 4 4 6% 11% 64%	4430
	21st to end	Day	3 2 1 3 3 3 4 4 7% 10% 59%	4802
August	1st to 10th	Day	5% 3 1 3 3 4 5% 4 7% 10% 54%	3830
	11th to 20th	Day	4 3 1 3 3 3 3 4 6% 9% 62%	3726
	21st to end	Day	3 2 1 4 3 4 5% 4 6% 11% 58%	4180
September	1st to 10th	Day	5% 3 1 3 3 2 3 3 5% 6% 65%	2280
	11th to 20th	Day	4 3 1 3 2 2 3 2 4 7% 68%	2165
	21st to end	Day	5% 2 2 3 2 3 3 3 3 6% 68%	2090
October	1st to 10th	Day	4 2 1 2 1 2 2 2 3 5% 77%	3460
	11th to 20th	Day	5% 3 1 1 2 2 3 3 4 6% 69%	3150
	21st to end	Day	5% 3 1 3 2 2 1 1 2 4 75%	3193
November	1st to 10th	Day	5% 3 1 2 2 2 2 3 4 6% 70%	1763
	11th to 20th	Day	3 4 1 4 2 2 3 3 3 5% 70%	1800
	21st to end	Day	6% 5% 2 4 3 2 3 3 3 5% 65%	1800
December	1st to 10th	Day	2 5% 1 3 2 2 2 2 3 6% 71%	2852
	11th to 20th	Day	3 4 1 3 2 2 4 3 6% 8% 64%	3026
	21st to end	Day	5% 6% 2 7% 3 3 3 3 4 6% 57%	4004
January	1st to 10th	Night	4 6% 2 5% 3 4 4 4 6% 8% 55%	4502
	11th to 20th	Night	3 5% 2 5% 3 3 4 3 5% 9% 59%	4430
	21st to end	Night	3 6% 2 5% 4 3 4 3 6% 7% 58%	4571
February	1st to 10th	Night	5% 7% 2 6% 4 3 3 2 5% 6% 57%	2302
	11th to 20th	Night	4 7% 3 6% 3 3 4 4 6% 8% 53%	2218
	21st to end	Night	5% 5% 1 4 3 2 4 3 4 7% 61%	1884
March	1st to 10th	Night	4 6% 2 3 3 2 3 3 4 6% 65%	3734
	11th to 20th	Night	9% 5% 2 5% 3 3 3 3 5% 7% 53%	3699
	21st to end	Night	6% 4 2 3 3 3 4 4 6% 8% 57%	3477
April	1st to 10th	Night	6% 5% 2 5% 3 3 3 3 5% 7% 59%	1900
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 5% 8% 53%	1877
	21st to end	Night	10% 5% 1 5% 4 3 4 3 5% 7% 52%	1900
May	1st to 10th	Night	10% 5% 2 5% 3 4 4 3 4 7% 53%	2851
	11th to 20th	Night	11% 6% 2 6% 4 3 4 4 5% 8% 47%	2823
	21st to end	Night	8% 5% 2 4 4 4 4 3 7% 7% 52%	2860
June	1st to 10th	Night	3 3 1 3 4 4 5% 5% 8% 10% 55%	1520
	11th to 20th	Night	5% 3 2 4 4 3 5% 4 7% 8% 57%	1520
	21st to end	Night	6% 4 1 7% 4 4 4 4 8% 9% 48%	1520
July	1st to 10th	Night	6% 4 2 5% 5% 4 5% 4 7% 9% 48%	2540
	11th to 20th	Night	4 3 1 5% 4 4 5% 5% 8% 11% 49%	2540
	21st to end	Night	5% 4 2 5% 5% 5% 5% 4 6% 9% 49%	2761
August	1st to 10th	Night	10% 5% 2 8% 5% 6% 7% 5% 8% 9% 34%	3104
	11th to 20th	Night	5% 4 2 6% 5% 5% 6% 5% 9% 11% 42%	3113
	21st to end	Night	3 3 1 5% 4 5% 7% 6% 10% 12% 44%	3487
September	1st to 10th	Night	4 3 2 4 3 3 4 4 6% 7% 59%	1900
	11th to 20th	Night	5% 2 1 3 3 3 3 4 5% 9% 62%	2014
	21st to end	Night	6% 3 1 3 3 3 3 3 4 6% 64%	2090
October	1st to 10th	Night	4 2 1 3 3 3 3 3 5% 5% 68%	3498
	11th to 20th	Night	8% 2 1 3 2 2 3 3 5% 7% 64%	3778
	21st to end	Night	4 4 1 3 3 3 2 2 3 4 70%	4331
November	1st to 10th	Night	4 3 1 3 2 2 2 3 4 6% 69%	2535
	11th to 20th	Night	4 4 1 4 2 3 2 2 4 4 70%	2600
	21st to end	Night	4 6% 2 4 3 3 3 2 5% 5% 64%	2600
December	1st to 10th	Night	2 4 1 4 2 2 2 2 3 5% 71%	4334
	11th to 20th	Night	3 5% 2 4 3 3 3 3 5% 7% 63%	5181
	21st to end	Night	5% 6% 2 5% 4 4 4 3 5% 7% 54%	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	26% 4 8% 32% 25% 5%	2587
	11th to 20th	Day	26% 4 13% 26% 21% 9%	2540
	21st to end	Day	27% 3 11% 31% 24% 4	3124
February	1st to 10th	Day	31% 4 9% 25% 22% 10%	1876
	11th to 20th	Day	26% 4 7% 27% 27% 9%	1859
	21st to end	Day	26% 2 6% 21% 28% 18%	1570
March	1st to 10th	Day	20% 3 6% 17% 31% 22%	3130
	11th to 20th	Day	25% 4 8% 24% 32% 6%	3255
	21st to end	Day	26% 4 8% 31% 22% 8%	4165
April	1st to 10th	Day	21% 4 9% 24% 26% 16%	2280
	11th to 20th	Day	27% 4 9% 25% 20% 15%	2254
	21st to end	Day	28% 5% 9% 24% 24% 10%	2280
May	1st to 10th	Day	23% 5% 10% 25% 21% 16%	4116
	11th to 20th	Day	25% 5% 13% 26% 23% 8%	4086
	21st to end	Day	17% 5% 14% 23% 23% 18%	4724
June	1st to 10th	Day	19% 5% 15% 28% 22% 10%	2660
	11th to 20th	Day	19% 4 9% 21% 25% 23%	2660
	21st to end	Day	21% 5% 9% 24% 25% 16%	2660
July	1st to 10th	Day	23% 6% 9% 20% 28% 15%	4361
	11th to 20th	Day	13% 5% 13% 24% 31% 13%	4355
	21st to end	Day	19% 5% 12% 22% 26% 16%	4651
August	1st to 10th	Day	23% 7% 19% 29% 15% 6%	3816
	11th to 20th	Day	19% 5% 14% 23% 27% 12%	3762
	21st to end	Day	19% 7% 10% 30% 23% 11%	4179
September	1st to 10th	Day	21% 4 9% 23% 26% 18%	2280
	11th to 20th	Day	17% 4 7% 21% 27% 24%	2165
	21st to end	Day	18% 3 7% 19% 34% 19%	2090
October	1st to 10th	Day	13% 2 5% 18% 35% 27%	3460
	11th to 20th	Day	17% 3 10% 23% 35% 13%	3150
	21st to end	Day	18% 2 3 22% 37% 19%	3193
November	1st to 10th	Day	17% 2 7% 25% 30% 18%	1763
	11th to 20th	Day	18% 2 5% 28% 34% 13%	1800
	21st to end	Day	24% 2 6% 19% 32% 17%	1800
December	1st to 10th	Day	17% 2 6% 34% 32% 8%	2852
	11th to 20th	Day	17% 3 6% 30% 37% 6%	3024
	21st to end	Day	29% 3 6% 26% 28% 8%	4004
January	1st to 10th	Night	26% 4 9% 32% 25% 4	4502
	11th to 20th	Night	23% 3 14% 29% 23% 9%	4430
	21st to end	Night	26% 4 12% 30% 25% 4	4571
February	1st to 10th	Night	29% 4 9% 23% 25% 10%	2302
	11th to 20th	Night	29% 4 9% 26% 24% 8%	2218
	21st to end	Night	23% 3 5% 23% 30% 17%	1884
March	1st to 10th	Night	21% 3 5% 19% 28% 24%	3734
	11th to 20th	Night	31% 4 11% 20% 23% 11%	3699
	21st to end	Night	24% 4 12% 29% 24% 8%	3477
April	1st to 10th	Night	26% 4 7% 22% 25% 16%	1900
	11th to 20th	Night	29% 5% 10% 23% 20% 12%	1877
	21st to end	Night	32% 5% 12% 23% 21% 8%	1900
May	1st to 10th	Night	30% 6% 16% 16% 17% 15%	2851
	11th to 20th	Night	34% 7% 16% 21% 15% 8%	2824
	21st to end	Night	30% 6% 11% 19% 20% 13%	2861
June	1st to 10th	Night	21% 7% 20% 26% 16% 10%	1520
	11th to 20th	Night	23% 6% 12% 21% 20% 18%	1520
	21st to end	Night	30% 6% 10% 19% 22% 12%	1520
July	1st to 10th	Night	31% 6% 11% 23% 24% 6%	2500
	11th to 20th	Night	27% 7% 15% 17% 27% 6%	2492
	21st to end	Night	31% 7% 12% 16% 24% 10%	2674
August	1st to 10th	Night	42% 9% 14% 20% 10% 5%	3095
	11th to 20th	Night	31% 9% 17% 22% 17% 4	3143
	21st to end	Night	28% 8% 12% 27% 18% 7%	3487
September	1st to 10th	Night	23% 6% 11% 23% 22% 16%	1900
	11th to 20th	Night	19% 5% 10% 21% 24% 21%	2014
	21st to end	Night	22% 4 6% 18% 33% 18%	2090
October	1st to 10th	Night	17% 3 8% 17% 31% 23%	3498
	11th to 20th	Night	21% 3 7% 25% 27% 17%	3778
	21st to end	Night	20% 2 5% 19% 39% 15%	4331
November	1st to 10th	Night	16% 3 8% 23% 30% 19%	2535
	11th to 20th	Night	19% 2 5% 24% 35% 15%	2600
	21st to end	Night	23% 2 7% 21% 31% 16%	2600
December	1st to 10th	Night	17% 2 7% 38% 27% 9%	4334
	11th to 20th	Night	21% 3 5% 29% 33% 9%	5182
	21st to end	Night	30% 3 7% 25% 29% 6%	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	6% 3 23% 44% 20% 5%	288
	11th to 20th	Day	11% 4 25% 39% 17% 3	270
	21st to end	Day	5% 4 27% 36% 24% 4	297
February	1st to 10th	Day	5% 9% 34% 36% 15% 2	270
	11th to 20th	Day	4 2 36% 41% 17%	270
	21st to end	Day	7% 6% 33% 41% 11% 2	225
March	1st to 10th	Day	6% 9% 26% 37% 19% 3	270
	11th to 20th	Day	11% 7% 28% 29% 20% 6%	298
	21st to end	Day	13% 14% 30% 28% 12% 1	506
April	1st to 10th	Day	8% 13% 32% 30% 13% 4	460
	11th to 20th	Day	12% 15% 30% 30% 10% 2	452
	21st to end	Day	11% 12% 34% 28% 12% 3	460
May	1st to 10th	Day	10% 11% 29% 30% 17% 3	649
	11th to 20th	Day	11% 6% 25% 31% 21% 6%	675
	21st to end	Day	7% 10% 26% 31% 20% 5%	734
June	1st to 10th	Day	4 5% 21% 30% 28% 11%	680
	11th to 20th	Day	5% 5% 26% 33% 24% 6%	680
	21st to end	Day	4 4 20% 33% 30% 8%	680
July	1st to 10th	Day	6% 2 14% 33% 32% 13%	671
	11th to 20th	Day	3 1 9% 32% 39% 16%	668
	21st to end	Day	5% 1 8% 29% 39% 18%	739
August	1st to 10th	Day	3 2 12% 32% 36% 15%	517
	11th to 20th	Day	4 2 15% 34% 32% 13%	477
	21st to end	Day	3 2 13% 36% 31% 16%	539
September	1st to 10th	Day	5% 1 15% 33% 29% 17%	490
	11th to 20th	Day	3 2 13% 30% 35% 18%	375
	21st to end	Day	8% 3 17% 23% 29% 20%	300
October	1st to 10th	Day	9% 6% 17% 24% 26% 18%	300
	11th to 20th	Day	4 3 22% 33% 24% 13%	300
	21st to end	Day	11% 6% 23% 26% 25% 9%	330
November	1st to 10th	Day	9% 3 23% 34% 23% 7%	300
	11th to 20th	Day	7% 5% 19% 38% 26% 5%	300
	21st to end	Day	11% 7% 20% 34% 22% 5%	300
December	1st to 10th	Day	4 4 18% 49% 20% 5%	300
	11th to 20th	Day	7% 5% 18% 42% 26% 2	300
	21st to end	Day	8% 8% 29% 41% 11% 2	330
January	1st to 10th	Night	7% 3 29% 48% 12% 2	981
	11th to 20th	Night	7% 5% 30% 44% 14% 1	950
	21st to end	Night	6% 4 27% 52% 11% 1	860
February	1st to 10th	Night	8% 5% 33% 46% 8%	760
	11th to 20th	Night	7% 7% 38% 40% 8%	744
	21st to end	Night	9% 7% 39% 41% 4	628
March	1st to 10th	Night	8% 7% 39% 39% 7% 1	760
	11th to 20th	Night	10% 9% 33% 37% 10%	739
	21st to end	Night	10% 10% 43% 33% 4	627
April	1st to 10th	Night	9% 10% 47% 30% 4	570
	11th to 20th	Night	12% 10% 43% 31% 3	563
	21st to end	Night	12% 11% 36% 32% 8%	570
May	1st to 10th	Night	9% 12% 37% 33% 8%	570
	11th to 20th	Night	12% 5% 33% 36% 13% 1	561
	21st to end	Night	11% 8% 41% 31% 8%	617
June	1st to 10th	Night	5% 4 38% 41% 12% 1	570
	11th to 20th	Night	6% 4 44% 39% 7%	570
	21st to end	Night	8% 3 33% 44% 11%	570
July	1st to 10th	Night	6% 3 24% 46% 19% 1	555
	11th to 20th	Night	4 1 18% 51% 25%	552
	21st to end	Night	7% 2 15% 46% 28% 1	624
August	1st to 10th	Night	7% 1 19% 41% 31% 1	567
	11th to 20th	Night	7% 1 23% 52% 17% 1	564
	21st to end	Night	5% 1 20% 49% 23% 2	627
September	1st to 10th	Night	5% 3 25% 49% 18%	570
	11th to 20th	Night	6% 2 27% 48% 17% 1	570
	21st to end	Night	6% 4 28% 44% 17% 1	570
October	1st to 10th	Night	8% 7% 28% 40% 16% 1	575
	11th to 20th	Night	5% 4 29% 43% 17% 2	760
	21st to end	Night	8% 6% 27% 39% 18% 1	959
November	1st to 10th	Night	6% 4 26% 48% 15% 1	975
	11th to 20th	Night	6% 6% 27% 46% 14% 1	1000
	21st to end	Night	8% 7% 25% 43% 17% 1	1000
December	1st to 10th	Night	6% 4 29% 47% 13% 1	1000
	11th to 20th	Night	8% 4 29% 44% 14% 1	1000
	21st to end	Night	9% 6% 32% 43% 9%	1100

Page generated at 2025-01-04 01:23:57. Version ac07

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