Capulin Volcano National Monument
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Capulin Volcano National Monument clear sky chart from 2005-11-06 to 2026-07-01.

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	3 4 2 5% 4 4 4 4 6% 8% 57%	146064
	Night	3 4 2 5% 3 4 4 4 6% 7% 58%	143796
Transparency	Day	25% 4 8% 21% 27% 15%	141135
	Night	25% 3 8% 23% 27% 14%	139735
Seeing	Day	9% 15% 30% 28% 15% 4	17613
	Night	6% 12% 34% 34% 13% 2	27619

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	1 5% 3 6% 4 5% 4 4 5% 6% 57%	4720
	11th to 20th	Day	1 3 2 5% 2 2 3 2 4 5% 72%	5077
	21st to end	Day	1 6% 3 6% 4 3 3 3 4 5% 61%	5844
February	1st to 10th	Day	2 4 2 5% 4 3 3 3 5% 8% 60%	2060
	11th to 20th	Day	1 5% 2 5% 4 4 4 3 4 7% 60%	2049
	21st to end	Day	1 4 2 4 2 2 3 3 5% 7% 66%	1730
March	1st to 10th	Day	1 5% 2 4 3 2 3 3 4 6% 67%	4600
	11th to 20th	Day	5% 8% 2 6% 4 4 4 4 6% 7% 51%	4874
	21st to end	Day	1 6% 2 4 3 4 4 4 6% 7% 57%	6056
April	1st to 10th	Day	3 5% 2 4 3 3 4 4 5% 7% 60%	2520
	11th to 20th	Day	5% 5% 2 5% 3 4 4 4 6% 7% 56%	2491
	21st to end	Day	5% 6% 2 4 3 3 4 4 6% 7% 55%	2520
May	1st to 10th	Day	9% 7% 2 5% 4 4 4 3 5% 6% 52%	7351
	11th to 20th	Day	5% 4 2 4 3 3 4 3 5% 6% 62%	7627
	21st to end	Day	4 4 2 5% 3 4 5% 5% 7% 9% 53%	8816
June	1st to 10th	Day	2 3 2 4 4 4 5% 6% 10% 11% 49%	2940
	11th to 20th	Day	3 2 1 3 3 3 5% 5% 7% 9% 58%	2940
	21st to end	Day	4 5% 2 5% 4 6% 6% 5% 8% 9% 47%	2940
July	1st to 10th	Day	3 2 1 5% 5% 5% 6% 5% 8% 10% 49%	6340
	11th to 20th	Day	2 2 1 5% 5% 6% 7% 7% 9% 11% 46%	6340
	21st to end	Day	6% 4 2 6% 6% 7% 7% 6% 8% 10% 38%	6635
August	1st to 10th	Day	3 3 2 5% 5% 6% 8% 6% 9% 11% 42%	5358
	11th to 20th	Day	3 3 1 5% 5% 5% 7% 5% 9% 11% 47%	5366
	21st to end	Day	4 3 2 6% 5% 6% 6% 5% 8% 11% 43%	5984
September	1st to 10th	Day	5% 4 2 4 4 4 5% 4 7% 9% 53%	2400
	11th to 20th	Day	5% 4 2 4 3 3 3 4 5% 8% 58%	2312
	21st to end	Day	4 3 1 4 3 3 4 3 4 7% 65%	2200
October	1st to 10th	Day	3 2 1 3 3 2 2 2 4 6% 72%	3499
	11th to 20th	Day	5% 3 1 4 3 3 3 3 6% 6% 61%	3250
	21st to end	Day	3 3 1 3 2 2 2 2 2 4 77%	3430
November	1st to 10th	Day	2 3 1 3 3 2 2 2 4 6% 72%	1853
	11th to 20th	Day	1 3 2 5% 3 3 2 2 4 6% 69%	1890
	21st to end	Day	3 5% 1 4 3 2 3 3 4 7% 65%	1890
December	1st to 10th	Day	2 2 3 2 2 2 2 4 6% 76%	2964
	11th to 20th	Day	1 3 2 4 3 3 4 4 5% 7% 64%	3106
	21st to end	Day	1 3 2 4 3 3 3 3 5% 5% 68%	4092
January	1st to 10th	Night	1 6% 3 8% 4 4 4 4 5% 6% 54%	8201
	11th to 20th	Night	1 2 1 4 3 3 3 2 4 5% 70%	7970
	21st to end	Night	1 4 2 6% 4 3 4 3 5% 6% 62%	8370
February	1st to 10th	Night	2 4 2 5% 3 3 3 3 5% 7% 62%	2557
	11th to 20th	Night	2 6% 2 5% 4 4 4 4 5% 7% 57%	2458
	21st to end	Night	1 4 1 4 2 3 2 3 6% 7% 67%	2076
March	1st to 10th	Night	2 5% 2 4 2 2 3 3 4 5% 68%	5494
	11th to 20th	Night	4 6% 2 6% 3 4 4 3 4 6% 59%	5321
	21st to end	Night	2 4 2 3 3 3 3 3 5% 7% 65%	5141
April	1st to 10th	Night	3 4 1 3 3 3 5% 3 5% 8% 63%	2100
	11th to 20th	Night	4 6% 2 6% 3 3 4 4 4 7% 56%	2077
	21st to end	Night	6% 4 2 4 3 3 4 4 5% 7% 58%	2100
May	1st to 10th	Night	10% 7% 2 4 3 3 4 3 5% 5% 54%	5592
	11th to 20th	Night	5% 4 1 4 3 3 3 2 6% 7% 62%	5265
	21st to end	Night	6% 6% 2 6% 4 4 4 4 5% 7% 51%	5374
June	1st to 10th	Night	3 4 1 4 4 4 5% 5% 8% 9% 52%	1680
	11th to 20th	Night	1 3 2 3 4 3 4 5% 7% 9% 59%	1680
	21st to end	Night	4 4 1 7% 4 4 5% 5% 9% 8% 49%	1680
July	1st to 10th	Night	6% 4 1 7% 5% 5% 6% 5% 7% 9% 46%	3640
	11th to 20th	Night	3 3 2 6% 5% 6% 6% 5% 9% 13% 42%	3640
	21st to end	Night	5% 4 2 5% 5% 6% 6% 6% 9% 11% 40%	4233
August	1st to 10th	Night	6% 4 2 5% 4 4 6% 5% 9% 12% 44%	4454
	11th to 20th	Night	3 3 1 4 4 5% 6% 6% 11% 15% 43%	4483
	21st to end	Night	6% 4 3 8% 6% 6% 6% 5% 9% 10% 37%	4993
September	1st to 10th	Night	4 3 1 4 4 4 4 4 6% 9% 56%	2000
	11th to 20th	Night	5% 3 2 4 3 3 3 3 6% 8% 59%	2086
	21st to end	Night	4 3 1 3 3 3 4 3 5% 7% 63%	2200
October	1st to 10th	Night	4 2 1 3 2 3 3 2 5% 5% 70%	3680
	11th to 20th	Night	6% 4 1 5% 3 3 3 2 4 6% 62%	3898
	21st to end	Night	3 4 1 3 2 2 2 2 4 5% 72%	4338
November	1st to 10th	Night	2 2 1 4 2 2 3 3 5% 6% 71%	2665
	11th to 20th	Night	1 3 1 3 2 2 3 3 4 6% 72%	2730
	21st to end	Night	2 3 2 4 3 2 4 3 5% 7% 64%	2730
December	1st to 10th	Night	1 4 2 4 2 2 3 2 4 6% 70%	4441
	11th to 20th	Night	1 2 1 3 3 3 4 3 6% 7% 65%	5321
	21st to end	Night	1 4 2 5% 4 4 4 3 5% 7% 60%	7128

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% 2 3 24% 36% 9%	4723
	11th to 20th	Day	17% 2 5% 21% 37% 18%	5077
	21st to end	Day	26% 2 3 17% 37% 14%	5844
February	1st to 10th	Day	23% 2 7% 24% 27% 17%	2060
	11th to 20th	Day	25% 3 5% 26% 28% 14%	2059
	21st to end	Day	18% 3 3 19% 32% 25%	1730
March	1st to 10th	Day	20% 2 2 11% 35% 30%	4600
	11th to 20th	Day	31% 2 3 14% 33% 16%	4874
	21st to end	Day	25% 2 4 31% 31% 6%	6056
April	1st to 10th	Day	23% 4 6% 22% 29% 17%	2520
	11th to 20th	Day	27% 4 5% 23% 24% 18%	2494
	21st to end	Day	26% 3 9% 22% 29% 10%	2520
May	1st to 10th	Day	34% 3 8% 18% 26% 12%	7351
	11th to 20th	Day	24% 3 5% 17% 28% 24%	7631
	21st to end	Day	28% 4 10% 18% 18% 22%	8817
June	1st to 10th	Day	25% 6% 15% 22% 19% 13%	2940
	11th to 20th	Day	21% 4 9% 18% 25% 23%	2940
	21st to end	Day	30% 5% 10% 19% 19% 16%	2940
July	1st to 10th	Day	28% 6% 14% 19% 21% 11%	6272
	11th to 20th	Day	28% 7% 18% 29% 16% 3	6265
	21st to end	Day	38% 7% 15% 20% 15% 6%	6444
August	1st to 10th	Day	36% 8% 16% 24% 11% 5%	3901
	11th to 20th	Day	27% 5% 14% 23% 20% 11%	3882
	21st to end	Day	30% 5% 15% 28% 16% 5%	4311
September	1st to 10th	Day	26% 5% 10% 26% 22% 10%	2400
	11th to 20th	Day	24% 4 8% 20% 25% 19%	2312
	21st to end	Day	21% 3 6% 21% 35% 15%	2200
October	1st to 10th	Day	16% 3 4 19% 42% 16%	3499
	11th to 20th	Day	23% 3 7% 19% 32% 15%	3250
	21st to end	Day	14% 2 3 16% 43% 23%	3430
November	1st to 10th	Day	15% 2 4 23% 34% 23%	1853
	11th to 20th	Day	18% 2 4 24% 35% 16%	1890
	21st to end	Day	21% 3 5% 17% 31% 22%	1890
December	1st to 10th	Day	12% 2 6% 24% 43% 13%	2964
	11th to 20th	Day	20% 2 5% 19% 38% 15%	3104
	21st to end	Day	18% 2 5% 27% 32% 17%	4092
January	1st to 10th	Night	30% 2 3 26% 30% 9%	8202
	11th to 20th	Night	19% 1 6% 25% 32% 16%	7970
	21st to end	Night	25% 2 4 20% 35% 15%	8370
February	1st to 10th	Night	22% 3 6% 25% 28% 15%	2557
	11th to 20th	Night	27% 3 7% 25% 25% 12%	2458
	21st to end	Night	17% 3 3 20% 37% 21%	2076
March	1st to 10th	Night	19% 2 2 13% 36% 28%	5494
	11th to 20th	Night	28% 2 5% 17% 29% 18%	5321
	21st to end	Night	20% 2 5% 33% 31% 9%	5141
April	1st to 10th	Night	20% 3 8% 25% 30% 14%	2100
	11th to 20th	Night	28% 3 7% 22% 24% 15%	2077
	21st to end	Night	25% 5% 12% 24% 23% 11%	2100
May	1st to 10th	Night	32% 3 9% 26% 17% 12%	5590
	11th to 20th	Night	23% 2 7% 22% 24% 21%	5266
	21st to end	Night	33% 4 15% 14% 13% 22%	5376
June	1st to 10th	Night	26% 6% 17% 23% 15% 13%	1680
	11th to 20th	Night	20% 4 12% 21% 22% 21%	1680
	21st to end	Night	29% 6% 13% 21% 21% 11%	1680
July	1st to 10th	Night	33% 7% 13% 22% 15% 9%	3600
	11th to 20th	Night	31% 6% 21% 29% 11% 2	3592
	21st to end	Night	35% 7% 20% 22% 13% 3	4112
August	1st to 10th	Night	37% 6% 18% 26% 11% 3	3235
	11th to 20th	Night	29% 6% 21% 25% 17% 3	3243
	21st to end	Night	35% 6% 19% 25% 11% 3	3597
September	1st to 10th	Night	24% 5% 13% 28% 21% 8%	2000
	11th to 20th	Night	23% 5% 10% 21% 26% 14%	2086
	21st to end	Night	21% 5% 8% 25% 31% 11%	2200
October	1st to 10th	Night	17% 3 6% 21% 38% 15%	3680
	11th to 20th	Night	25% 3 7% 19% 30% 15%	3898
	21st to end	Night	17% 2 3 19% 39% 19%	4338
November	1st to 10th	Night	16% 3 5% 22% 35% 19%	2665
	11th to 20th	Night	14% 2 4 26% 38% 16%	2730
	21st to end	Night	20% 3 6% 22% 29% 20%	2730
December	1st to 10th	Night	17% 2 6% 26% 39% 10%	4441
	11th to 20th	Night	19% 2 4 21% 39% 16%	5322
	21st to end	Night	24% 1 7% 23% 30% 15%	7128

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	9% 18% 38% 24% 9% 1	330
	11th to 20th	Day	9% 21% 37% 20% 10% 3	330
	21st to end	Day	4 22% 37% 23% 11% 3	363
February	1st to 10th	Day	10% 20% 40% 22% 7% 1	330
	11th to 20th	Day	11% 26% 38% 19% 5% 1	330
	21st to end	Day	11% 25% 37% 22% 5%	273
March	1st to 10th	Day	11% 22% 38% 22% 7% 1	330
	11th to 20th	Day	15% 21% 32% 20% 9% 2	434
	21st to end	Day	15% 31% 31% 14% 7% 1	594
April	1st to 10th	Day	11% 27% 38% 16% 7% 1	540
	11th to 20th	Day	17% 29% 36% 14% 4 1	532
	21st to end	Day	14% 31% 34% 16% 4 1	540
May	1st to 10th	Day	14% 20% 34% 22% 9% 1	644
	11th to 20th	Day	10% 17% 33% 24% 13% 3	775
	21st to end	Day	8% 19% 33% 28% 10% 2	844
June	1st to 10th	Day	4 12% 26% 32% 21% 5%	780
	11th to 20th	Day	5% 11% 33% 33% 16% 2	780
	21st to end	Day	7% 7% 31% 32% 19% 4	780
July	1st to 10th	Day	5% 4 22% 36% 28% 4	722
	11th to 20th	Day	3 2 12% 37% 36% 9%	718
	21st to end	Day	6% 2 13% 35% 34% 10%	679
August	1st to 10th	Day	7% 5% 19% 37% 24% 8%	527
	11th to 20th	Day	8% 3 21% 38% 25% 5%	517
	21st to end	Day	6% 3 21% 42% 22% 5%	583
September	1st to 10th	Day	6% 4 25% 39% 20% 5%	530
	11th to 20th	Day	6% 7% 28% 31% 20% 7%	442
	21st to end	Day	9% 9% 22% 31% 24% 5%	330
October	1st to 10th	Day	10% 15% 27% 28% 14% 6%	330
	11th to 20th	Day	7% 17% 31% 25% 13% 7%	330
	21st to end	Day	11% 14% 32% 27% 12% 4	363
November	1st to 10th	Day	9% 16% 32% 28% 12% 3	330
	11th to 20th	Day	7% 14% 37% 23% 14% 4	330
	21st to end	Day	14% 16% 37% 18% 12% 4	330
December	1st to 10th	Day	5% 22% 31% 28% 12% 2	330
	11th to 20th	Day	7% 17% 40% 26% 9% 1	330
	21st to end	Day	9% 23% 38% 25% 5%	363
January	1st to 10th	Night	5% 11% 39% 33% 11% 1	1050
	11th to 20th	Night	6% 14% 36% 30% 13% 2	952
	21st to end	Night	4 12% 38% 33% 11% 2	924
February	1st to 10th	Night	4 17% 41% 29% 8% 1	840
	11th to 20th	Night	6% 21% 43% 23% 6% 1	824
	21st to end	Night	5% 18% 47% 26% 4	692
March	1st to 10th	Night	6% 18% 41% 28% 6% 1	840
	11th to 20th	Night	7% 17% 35% 30% 10% 1	840
	21st to end	Night	6% 23% 42% 23% 6%	714
April	1st to 10th	Night	8% 18% 45% 26% 3	630
	11th to 20th	Night	9% 19% 44% 24% 3	623
	21st to end	Night	9% 15% 44% 25% 7%	630
May	1st to 10th	Night	7% 16% 34% 36% 7%	630
	11th to 20th	Night	8% 12% 37% 30% 10% 2	621
	21st to end	Night	6% 15% 41% 28% 9% 1	683
June	1st to 10th	Night	5% 8% 34% 38% 14% 1	630
	11th to 20th	Night	3 7% 43% 37% 10%	630
	21st to end	Night	6% 7% 32% 40% 14% 2	630
July	1st to 10th	Night	5% 4 22% 42% 24% 2	585
	11th to 20th	Night	3 2 19% 44% 30% 3	582
	21st to end	Night	7% 2 16% 42% 29% 3	657
August	1st to 10th	Night	6% 3 15% 37% 35% 5%	597
	11th to 20th	Night	6% 3 15% 51% 24% 2	594
	21st to end	Night	5% 3 21% 45% 23% 4	660
September	1st to 10th	Night	5% 3 23% 49% 19% 2	600
	11th to 20th	Night	6% 5% 32% 37% 17% 3	600
	21st to end	Night	5% 12% 26% 40% 15% 3	600
October	1st to 10th	Night	8% 10% 31% 35% 15% 1	651
	11th to 20th	Night	5% 9% 34% 35% 14% 4	800
	21st to end	Night	7% 11% 29% 35% 15% 3	930
November	1st to 10th	Night	5% 11% 32% 36% 14% 2	1025
	11th to 20th	Night	3 12% 36% 34% 12% 2	1050
	21st to end	Night	7% 13% 31% 33% 13% 3	1050
December	1st to 10th	Night	4 13% 37% 34% 10% 2	1050
	11th to 20th	Night	6% 12% 37% 34% 10% 1	1050
	21st to end	Night	7% 17% 35% 32% 8% 1	1155

Page generated at 2026-06-28 00:10:49. Version ac07

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