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 2025-02-25.

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%	112583
	Night	3 4 2 5% 4 4 4 4 6% 7% 59%	114927
Transparency	Day	25% 4 8% 21% 28% 14%	112331
	Night	25% 3 8% 23% 28% 13%	114770
Seeing	Day	8% 15% 29% 28% 16% 4	15711
	Night	6% 12% 33% 34% 13% 2	25879

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 5% 4 5% 4 4 5% 6% 58%	3638
	11th to 20th	Day	1 3 3 6% 2 2 3 3 5% 6% 67%	3893
	21st to end	Day	1 6% 3 5% 3 3 3 3 5% 6% 61%	4510
February	1st to 10th	Day	2 5% 2 6% 4 3 3 3 5% 9% 59%	1962
	11th to 20th	Day	1 5% 2 5% 4 4 4 3 4 7% 61%	1949
	21st to end	Day	1 4 2 4 2 2 4 3 6% 7% 64%	1610
March	1st to 10th	Day	1 4 2 4 4 3 3 3 4 7% 64%	3130
	11th to 20th	Day	7% 9% 2 7% 5% 4 4 3 5% 6% 47%	3329
	21st to end	Day	2 8% 2 5% 4 4 4 4 6% 7% 54%	4134
April	1st to 10th	Day	3 4 1 4 3 3 4 3 5% 7% 61%	2280
	11th to 20th	Day	5% 5% 2 5% 4 4 4 4 6% 7% 56%	2251
	21st to end	Day	5% 6% 2 4 3 4 5% 4 6% 7% 54%	2280
May	1st to 10th	Day	6% 5% 2 4 3 3 4 4 6% 6% 57%	3956
	11th to 20th	Day	8% 6% 2 5% 4 3 5% 4 5% 8% 51%	4082
	21st to end	Day	2 3 1 3 3 4 4 5% 7% 8% 60%	4719
June	1st to 10th	Day	2 3 2 4 4 4 5% 6% 9% 11% 50%	2660
	11th to 20th	Day	3 2 1 3 3 3 5% 5% 7% 8% 57%	2660
	21st to end	Day	5% 5% 2 5% 4 6% 6% 5% 8% 9% 45%	2660
July	1st to 10th	Day	4 3 1 5% 5% 6% 6% 5% 9% 10% 46%	4430
	11th to 20th	Day	2 2 1 5% 5% 6% 7% 6% 9% 10% 46%	4430
	21st to end	Day	6% 4 2 6% 5% 5% 6% 6% 8% 10% 42%	4618
August	1st to 10th	Day	5% 5% 2 6% 5% 6% 7% 6% 8% 11% 39%	3794
	11th to 20th	Day	4 3 1 5% 4 5% 6% 4 8% 10% 50%	3726
	21st to end	Day	2 3 2 6% 5% 6% 6% 6% 9% 12% 44%	4180
September	1st to 10th	Day	5% 4 1 5% 4 4 5% 4 7% 9% 53%	2280
	11th to 20th	Day	6% 4 2 4 3 3 3 4 5% 8% 58%	2197
	21st to end	Day	4 3 1 4 2 3 4 3 4 7% 65%	2090
October	1st to 10th	Day	3 2 1 3 3 2 2 2 4 6% 72%	3392
	11th to 20th	Day	5% 3 1 4 3 3 3 3 6% 6% 61%	3150
	21st to end	Day	3 3 1 3 2 2 2 2 2 4 77%	3324
November	1st to 10th	Day	2 3 1 3 3 2 2 3 4 6% 72%	1763
	11th to 20th	Day	1 3 2 5% 3 3 2 2 4 6% 69%	1800
	21st to end	Day	3 5% 1 4 3 2 3 2 4 7% 65%	1800
December	1st to 10th	Day	2 2 3 2 1 2 2 4 6% 76%	2876
	11th to 20th	Day	1 3 2 4 3 3 4 4 5% 7% 64%	3026
	21st to end	Day	1 3 2 4 3 3 3 3 5% 5% 68%	4004
January	1st to 10th	Night	1 6% 3 9% 4 4 4 4 5% 6% 54%	6327
	11th to 20th	Night	1 3 2 5% 4 3 4 3 4 5% 66%	6130
	21st to end	Night	1 4 2 5% 3 4 4 3 5% 7% 62%	6468
February	1st to 10th	Night	2 5% 2 5% 3 3 3 3 5% 7% 62%	2435
	11th to 20th	Night	2 6% 2 5% 4 4 4 4 5% 7% 57%	2338
	21st to end	Night	1 4 1 4 2 3 2 3 6% 7% 66%	1938
March	1st to 10th	Night	2 5% 2 5% 3 2 3 3 4 5% 68%	3734
	11th to 20th	Night	5% 7% 3 6% 4 4 4 4 5% 6% 53%	3631
	21st to end	Night	2 5% 3 4 3 3 3 3 5% 6% 61%	3509
April	1st to 10th	Night	3 4 1 3 3 3 5% 3 5% 7% 63%	1900
	11th to 20th	Night	4 7% 2 6% 4 4 4 4 4 7% 55%	1877
	21st to end	Night	6% 4 2 4 3 3 4 4 5% 7% 58%	1900
May	1st to 10th	Night	6% 4 1 3 3 3 4 3 5% 5% 63%	3010
	11th to 20th	Night	8% 6% 2 6% 4 4 5% 3 7% 8% 47%	2823
	21st to end	Night	4 3 2 4 4 4 4 4 6% 7% 59%	2864
June	1st to 10th	Night	3 4 1 4 4 4 5% 5% 8% 9% 54%	1520
	11th to 20th	Night	2 3 2 3 3 3 4 4 7% 9% 59%	1520
	21st to end	Night	4 4 2 7% 4 4 6% 5% 9% 8% 48%	1520
July	1st to 10th	Night	6% 4 1 6% 4 5% 6% 5% 8% 10% 43%	2540
	11th to 20th	Night	3 3 2 6% 5% 5% 6% 5% 8% 12% 45%	2540
	21st to end	Night	6% 4 2 6% 5% 5% 5% 5% 8% 9% 45%	2940
August	1st to 10th	Night	7% 5% 3 6% 5% 5% 6% 6% 10% 13% 35%	3145
	11th to 20th	Night	3 3 2 5% 5% 5% 6% 6% 10% 13% 42%	3113
	21st to end	Night	2 3 2 7% 6% 6% 7% 6% 10% 12% 39%	3487
September	1st to 10th	Night	4 3 1 4 4 4 4 4 6% 9% 56%	1900
	11th to 20th	Night	4 3 2 4 3 3 3 3 6% 8% 59%	1981
	21st to end	Night	4 3 1 3 3 3 4 3 5% 7% 64%	2090
October	1st to 10th	Night	4 2 1 3 2 3 3 2 5% 5% 70%	3567
	11th to 20th	Night	7% 3 1 5% 3 3 3 2 4 6% 62%	3778
	21st to end	Night	3 4 1 3 2 2 2 2 3 5% 72%	4203
November	1st to 10th	Night	2 2 1 4 2 2 3 3 5% 6% 70%	2535
	11th to 20th	Night	1 3 1 3 2 2 3 3 4 5% 73%	2600
	21st to end	Night	3 3 2 4 3 2 4 3 5% 7% 65%	2600
December	1st to 10th	Night	1 4 2 4 2 2 3 2 3 6% 70%	4309
	11th to 20th	Night	1 3 1 3 3 3 4 3 6% 7% 64%	5181
	21st to end	Night	1 4 2 5% 4 4 4 3 5% 7% 60%	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	24% 2 3 26% 34% 11%	3639
	11th to 20th	Day	19% 2 5% 21% 36% 17%	3893
	21st to end	Day	25% 2 4 19% 37% 13%	4510
February	1st to 10th	Day	23% 2 7% 24% 26% 17%	1962
	11th to 20th	Day	25% 3 5% 26% 27% 14%	1959
	21st to end	Day	19% 3 3 19% 31% 24%	1610
March	1st to 10th	Day	21% 2 3 14% 37% 23%	3130
	11th to 20th	Day	37% 2 5% 19% 29% 8%	3329
	21st to end	Day	30% 2 5% 22% 34% 8%	4134
April	1st to 10th	Day	23% 3 6% 22% 28% 18%	2280
	11th to 20th	Day	27% 4 5% 23% 23% 17%	2254
	21st to end	Day	28% 3 10% 22% 28% 9%	2280
May	1st to 10th	Day	29% 3 8% 17% 23% 20%	3956
	11th to 20th	Day	33% 3 7% 20% 24% 12%	4086
	21st to end	Day	22% 3 9% 17% 24% 26%	4719
June	1st to 10th	Day	24% 6% 15% 22% 20% 12%	2660
	11th to 20th	Day	21% 4 8% 17% 25% 23%	2660
	21st to end	Day	31% 6% 11% 19% 19% 14%	2660
July	1st to 10th	Day	30% 7% 12% 19% 20% 12%	4361
	11th to 20th	Day	28% 6% 14% 28% 19% 4	4355
	21st to end	Day	33% 7% 13% 22% 18% 7%	4472
August	1st to 10th	Day	36% 8% 17% 24% 11% 5%	3781
	11th to 20th	Day	27% 5% 14% 22% 20% 11%	3762
	21st to end	Day	30% 5% 15% 28% 16% 5%	4179
September	1st to 10th	Day	26% 5% 10% 26% 23% 11%	2280
	11th to 20th	Day	25% 4 8% 19% 25% 19%	2197
	21st to end	Day	20% 3 6% 21% 35% 15%	2090
October	1st to 10th	Day	16% 3 4 18% 42% 17%	3392
	11th to 20th	Day	23% 3 7% 20% 32% 15%	3150
	21st to end	Day	14% 2 3 15% 43% 23%	3324
November	1st to 10th	Day	16% 2 4 21% 33% 23%	1763
	11th to 20th	Day	18% 2 4 24% 34% 17%	1800
	21st to end	Day	22% 3 5% 15% 32% 23%	1800
December	1st to 10th	Day	12% 2 6% 24% 43% 13%	2876
	11th to 20th	Day	21% 2 5% 19% 38% 15%	3024
	21st to end	Day	18% 2 4 27% 33% 16%	4004
January	1st to 10th	Night	31% 2 3 27% 28% 9%	6327
	11th to 20th	Night	23% 1 5% 24% 31% 16%	6130
	21st to end	Night	24% 2 5% 21% 35% 13%	6468
February	1st to 10th	Night	23% 3 6% 25% 27% 15%	2435
	11th to 20th	Night	28% 3 7% 25% 25% 12%	2338
	21st to end	Night	18% 3 3 20% 37% 20%	1938
March	1st to 10th	Night	19% 2 3 16% 37% 23%	3734
	11th to 20th	Night	34% 1 8% 23% 25% 10%	3631
	21st to end	Night	25% 2 5% 27% 33% 8%	3509
April	1st to 10th	Night	20% 3 8% 25% 29% 15%	1900
	11th to 20th	Night	29% 3 8% 22% 23% 14%	1877
	21st to end	Night	25% 5% 13% 25% 22% 10%	1900
May	1st to 10th	Night	25% 2 9% 20% 21% 22%	3010
	11th to 20th	Night	35% 3 9% 26% 17% 10%	2824
	21st to end	Night	25% 4 12% 14% 18% 28%	2865
June	1st to 10th	Night	26% 6% 16% 24% 15% 13%	1520
	11th to 20th	Night	20% 4 12% 20% 23% 22%	1520
	21st to end	Night	29% 6% 14% 21% 20% 11%	1520
July	1st to 10th	Night	33% 7% 14% 21% 14% 11%	2500
	11th to 20th	Night	30% 4 20% 29% 14% 3	2492
	21st to end	Night	34% 6% 16% 25% 14% 5%	2848
August	1st to 10th	Night	37% 6% 18% 26% 10% 3	3135
	11th to 20th	Night	29% 6% 21% 25% 17% 3	3143
	21st to end	Night	34% 6% 20% 26% 11% 3	3487
September	1st to 10th	Night	24% 5% 14% 28% 21% 9%	1900
	11th to 20th	Night	23% 6% 10% 20% 27% 14%	1981
	21st to end	Night	21% 5% 7% 25% 32% 11%	2090
October	1st to 10th	Night	17% 3 6% 21% 38% 16%	3567
	11th to 20th	Night	25% 3 7% 19% 31% 15%	3778
	21st to end	Night	17% 2 3 19% 39% 19%	4203
November	1st to 10th	Night	17% 3 6% 21% 34% 20%	2535
	11th to 20th	Night	15% 2 5% 26% 37% 17%	2600
	21st to end	Night	21% 3 5% 20% 30% 21%	2600
December	1st to 10th	Night	17% 2 5% 26% 39% 10%	4309
	11th to 20th	Night	19% 2 4 21% 38% 16%	5182
	21st to end	Night	24% 1 7% 23% 30% 15%	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	9% 18% 38% 24% 10% 1	300
	11th to 20th	Day	10% 22% 36% 20% 9% 3	300
	21st to end	Day	4 22% 35% 23% 12% 4	330
February	1st to 10th	Day	11% 22% 39% 20% 7% 1	300
	11th to 20th	Day	9% 26% 39% 19% 6% 1	300
	21st to end	Day	12% 28% 35% 22% 4	237
March	1st to 10th	Day	9% 24% 36% 21% 9% 1	270
	11th to 20th	Day	14% 22% 32% 21% 10% 1	364
	21st to end	Day	17% 33% 32% 11% 6% 1	506
April	1st to 10th	Day	11% 28% 39% 16% 5% 1	460
	11th to 20th	Day	16% 29% 36% 14% 4 1	452
	21st to end	Day	13% 30% 35% 17% 4 1	460
May	1st to 10th	Day	12% 21% 34% 23% 10% 1	554
	11th to 20th	Day	9% 16% 32% 24% 14% 4	675
	21st to end	Day	8% 20% 33% 27% 10% 2	734
June	1st to 10th	Day	4 13% 24% 32% 22% 5%	680
	11th to 20th	Day	5% 10% 32% 34% 16% 2	680
	21st to end	Day	7% 5% 30% 33% 20% 4	680
July	1st to 10th	Day	5% 4 21% 36% 30% 4	671
	11th to 20th	Day	4 2 12% 38% 37% 9%	668
	21st to end	Day	6% 2 12% 34% 34% 11%	630
August	1st to 10th	Day	7% 5% 17% 38% 24% 9%	487
	11th to 20th	Day	8% 3 21% 38% 25% 4	477
	21st to end	Day	5% 3 21% 43% 22% 5%	539
September	1st to 10th	Day	6% 4 26% 38% 21% 6%	490
	11th to 20th	Day	7% 7% 26% 32% 20% 8%	407
	21st to end	Day	9% 9% 20% 31% 25% 6%	300
October	1st to 10th	Day	10% 15% 26% 28% 15% 6%	300
	11th to 20th	Day	7% 16% 29% 27% 15% 7%	300
	21st to end	Day	12% 14% 32% 25% 13% 4	330
November	1st to 10th	Day	10% 17% 30% 28% 12% 3	300
	11th to 20th	Day	8% 14% 38% 22% 14% 4	300
	21st to end	Day	14% 16% 35% 18% 12% 4	300
December	1st to 10th	Day	5% 22% 30% 28% 13% 2	300
	11th to 20th	Day	7% 18% 39% 26% 8% 1	300
	21st to end	Day	9% 24% 37% 25% 5%	330
January	1st to 10th	Night	5% 11% 37% 34% 12% 1	1000
	11th to 20th	Night	6% 15% 35% 30% 13% 2	907
	21st to end	Night	4 12% 38% 33% 11% 2	880
February	1st to 10th	Night	4 18% 42% 28% 8% 1	800
	11th to 20th	Night	6% 21% 42% 23% 7% 1	784
	21st to end	Night	6% 19% 47% 25% 4	646
March	1st to 10th	Night	6% 19% 39% 28% 7% 1	760
	11th to 20th	Night	7% 17% 34% 30% 10% 1	760
	21st to end	Night	6% 24% 40% 22% 7%	646
April	1st to 10th	Night	7% 18% 46% 24% 3	570
	11th to 20th	Night	10% 19% 42% 25% 3	563
	21st to end	Night	9% 15% 43% 26% 7%	570
May	1st to 10th	Night	6% 16% 36% 35% 7%	570
	11th to 20th	Night	9% 11% 35% 31% 11% 2	561
	21st to end	Night	5% 15% 42% 28% 9% 1	617
June	1st to 10th	Night	4 8% 33% 39% 15% 1	570
	11th to 20th	Night	3 7% 42% 37% 11%	570
	21st to end	Night	6% 6% 30% 41% 15% 2	570
July	1st to 10th	Night	5% 4 21% 42% 25% 2	555
	11th to 20th	Night	3 2 18% 44% 30% 3	552
	21st to end	Night	8% 2 15% 42% 30% 3	624
August	1st to 10th	Night	6% 2 15% 36% 36% 5%	567
	11th to 20th	Night	6% 3 15% 50% 24% 2	564
	21st to end	Night	4 3 21% 45% 23% 4	627
September	1st to 10th	Night	5% 3 23% 48% 20% 2	570
	11th to 20th	Night	6% 4 32% 37% 18% 3	570
	21st to end	Night	5% 11% 26% 39% 16% 3	570
October	1st to 10th	Night	8% 10% 30% 36% 15% 1	618
	11th to 20th	Night	4 9% 33% 36% 14% 4	760
	21st to end	Night	8% 11% 28% 34% 16% 4	883
November	1st to 10th	Night	5% 11% 31% 37% 14% 2	975
	11th to 20th	Night	4 12% 37% 34% 12% 2	1000
	21st to end	Night	7% 13% 30% 33% 14% 3	1000
December	1st to 10th	Night	5% 12% 36% 34% 11% 2	1000
	11th to 20th	Night	6% 13% 37% 34% 10% 1	1000
	21st to end	Night	8% 17% 34% 32% 8% 1	1100

Page generated at 2025-02-22 04:51:38. Version ac07

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