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 2005-11-05 to 2024-10-14.

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 5% 4 6% 8% 55%	100832
	Night	3 4 2 5% 4 4 4 4 6% 8% 57%	97946
Transparency	Day	26% 4 9% 22% 26% 14%	100580
	Night	25% 3 9% 24% 26% 12%	97789
Seeing	Day	8% 15% 29% 28% 16% 4	15309
	Night	6% 12% 33% 34% 13% 2	25264

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 6% 2 4 4 4 4 4 5% 7% 59%	2538
	11th to 20th	Day	1 3 1 3 2 2 3 3 5% 7% 70%	2709
	21st to end	Day	2 7% 3 6% 4 3 3 3 5% 7% 56%	3146
February	1st to 10th	Day	2 5% 2 6% 4 3 3 3 5% 8% 59%	1863
	11th to 20th	Day	1 5% 2 5% 3 4 4 3 4 7% 61%	1849
	21st to end	Day	1 4 2 4 3 2 4 3 6% 7% 64%	1570
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	5% 3 2 3 3 3 3 3 5% 7% 62%	2038
	11th to 20th	Day	2 3 1 3 2 3 3 3 5% 4 74%	1830
	21st to end	Day	5% 4 2 4 2 2 2 2 3 5% 70%	1918
November	1st to 10th	Day	1 2 1 3 3 2 2 3 4 6% 73%	1673
	11th to 20th	Day	1 3 2 5% 3 3 2 2 5% 6% 69%	1710
	21st to end	Day	3 5% 1 4 3 2 3 3 4 7% 64%	1710
December	1st to 10th	Day	1 4 3 5% 3 2 4 3 5% 8% 63%	1672
	11th to 20th	Day	2 4 2 5% 4 3 4 4 5% 6% 61%	1926
	21st to end	Day	1 4 2 5% 3 3 3 3 6% 6% 63%	2794
January	1st to 10th	Night	1 6% 2 7% 4 4 4 4 5% 7% 55%	4417
	11th to 20th	Night	2 3 2 5% 4 3 4 3 4 5% 67%	4290
	21st to end	Night	1 5% 2 5% 3 3 4 3 5% 8% 60%	4521
February	1st to 10th	Night	2 5% 2 5% 4 3 4 3 5% 7% 61%	2314
	11th to 20th	Night	2 6% 2 5% 4 4 4 3 5% 6% 58%	2218
	21st to end	Night	1 4 2 4 2 3 2 3 6% 7% 65%	1884
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	6% 4 1 4 3 3 3 3 5% 6% 62%	2138
	11th to 20th	Night	1 2 1 3 2 2 2 2 3 6% 76%	2208
	21st to end	Night	5% 4 1 4 3 3 3 2 4 6% 65%	2420
November	1st to 10th	Night	1 2 1 3 2 2 3 3 5% 6% 72%	2405
	11th to 20th	Night	1 3 1 3 2 2 3 3 4 5% 72%	2470
	21st to end	Night	3 3 2 4 4 2 4 3 5% 7% 63%	2470
December	1st to 10th	Night	2 5% 1 4 3 3 3 3 5% 8% 62%	2503
	11th to 20th	Night	2 4 2 4 4 3 4 4 6% 7% 61%	3271
	21st to end	Night	1 4 2 5% 4 4 4 4 6% 7% 58%	4873

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	22% 1 4 28% 35% 9%	2539
	11th to 20th	Day	16% 1 7% 29% 40% 7%	2709
	21st to end	Day	29% 1 5% 24% 32% 8%	3146
February	1st to 10th	Day	24% 3 8% 24% 26% 16%	1863
	11th to 20th	Day	25% 3 5% 25% 28% 15%	1859
	21st to end	Day	20% 3 3 20% 31% 23%	1570
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	23% 3 7% 22% 31% 13%	2038
	11th to 20th	Day	15% 2 4 15% 38% 25%	1830
	21st to end	Day	19% 2 5% 22% 35% 17%	1918
November	1st to 10th	Day	14% 2 4 22% 34% 24%	1673
	11th to 20th	Day	18% 2 5% 25% 35% 15%	1710
	21st to end	Day	22% 3 5% 15% 32% 23%	1710
December	1st to 10th	Day	20% 3 10% 28% 27% 13%	1672
	11th to 20th	Day	25% 2 6% 20% 29% 17%	1924
	21st to end	Day	20% 2 6% 24% 29% 18%	2794
January	1st to 10th	Night	29% 1 4 26% 32% 7%	4417
	11th to 20th	Night	23% 1 6% 31% 29% 10%	4290
	21st to end	Night	24% 2 7% 28% 33% 6%	4521
February	1st to 10th	Night	24% 3 7% 26% 27% 14%	2314
	11th to 20th	Night	27% 3 7% 25% 25% 12%	2218
	21st to end	Night	18% 3 3 20% 36% 20%	1884
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	24% 3 9% 22% 27% 14%	2138
	11th to 20th	Night	13% 3 5% 18% 38% 24%	2208
	21st to end	Night	22% 2 5% 23% 32% 16%	2420
November	1st to 10th	Night	15% 3 6% 22% 34% 20%	2405
	11th to 20th	Night	15% 2 5% 27% 37% 15%	2470
	21st to end	Night	21% 3 5% 20% 30% 21%	2470
December	1st to 10th	Night	21% 3 9% 28% 27% 11%	2503
	11th to 20th	Night	23% 2 6% 20% 37% 13%	3272
	21st to end	Night	25% 2 8% 22% 27% 16%	4873

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% 16% 37% 26% 10% 1	270
	11th to 20th	Day	11% 21% 35% 20% 10% 3	270
	21st to end	Day	4 21% 35% 24% 12% 4	297
February	1st to 10th	Day	9% 21% 40% 21% 8% 1	270
	11th to 20th	Day	9% 25% 39% 20% 7% 1	270
	21st to end	Day	13% 28% 35% 21% 3	225
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	5% 15% 29% 27% 16% 8%	279
	21st to end	Day	12% 13% 31% 26% 13% 4	297
November	1st to 10th	Day	7% 17% 31% 30% 13% 3	270
	11th to 20th	Day	6% 14% 37% 24% 14% 5%	270
	21st to end	Day	14% 17% 34% 19% 12% 4	270
December	1st to 10th	Day	6% 23% 32% 26% 12% 1	270
	11th to 20th	Day	8% 18% 39% 25% 9% 1	270
	21st to end	Day	10% 24% 37% 25% 4	297
January	1st to 10th	Night	5% 11% 37% 34% 12% 1	950
	11th to 20th	Night	6% 15% 35% 30% 13% 2	862
	21st to end	Night	4 13% 36% 33% 12% 2	836
February	1st to 10th	Night	4 17% 41% 29% 8% 1	760
	11th to 20th	Night	6% 20% 42% 24% 7% 1	744
	21st to end	Night	6% 19% 48% 24% 4	628
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	3 9% 34% 37% 15% 4	734
	21st to end	Night	8% 11% 28% 34% 16% 4	836
November	1st to 10th	Night	4 10% 31% 38% 15% 2	925
	11th to 20th	Night	3 12% 36% 34% 13% 2	950
	21st to end	Night	7% 13% 30% 33% 14% 3	950
December	1st to 10th	Night	5% 13% 36% 33% 11% 2	950
	11th to 20th	Night	6% 13% 36% 34% 11% 1	950
	21st to end	Night	7% 17% 34% 32% 8% 1	1045

Page generated at 2024-10-11 08:50:00. Version ac07

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