Mesa Verde National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mesa Verde National Park clear sky chart from 2005-11-06 to 2025-04-26.

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 5% 2 5% 4 4 4 4 5% 7% 57%	117643
	Night	4 6% 2 5% 4 3 4 3 5% 6% 57%	119889
Transparency	Day	23% 5% 10% 20% 26% 16%	117408
	Night	26% 4 8% 20% 25% 16%	119713
Seeing	Day	8% 13% 27% 32% 17% 3	15607
	Night	8% 6% 21% 38% 23% 3	25976

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 7% 3 6% 4 4 4 4 4 6% 55%	4098
	11th to 20th	Day	3 6% 2 5% 4 4 4 4 4 5% 60%	4100
	21st to end	Day	5% 8% 2 6% 3 3 3 3 4 4 59%	4510
February	1st to 10th	Day	4 9% 3 7% 5% 4 3 3 4 6% 53%	1800
	11th to 20th	Day	5% 9% 2 7% 4 4 5% 3 4 6% 49%	1767
	21st to end	Day	6% 11% 3 5% 5% 3 5% 3 4 5% 51%	1722
March	1st to 10th	Day	4 9% 2 5% 3 4 4 4 6% 7% 53%	4954
	11th to 20th	Day	3 10% 4 9% 5% 6% 5% 5% 6% 7% 41%	5000
	21st to end	Day	4 8% 3 7% 5% 4 5% 5% 6% 9% 44%	5486
April	1st to 10th	Day	4 5% 2 6% 4 4 4 5% 5% 7% 54%	2359
	11th to 20th	Day	3 6% 2 6% 4 4 5% 4 5% 8% 52%	2371
	21st to end	Day	4 4 2 5% 4 4 4 4 6% 7% 56%	2341
May	1st to 10th	Day	5% 4 2 5% 4 4 4 3 5% 6% 60%	4073
	11th to 20th	Day	3 4 1 4 4 4 5% 4 7% 8% 56%	4071
	21st to end	Day	3 2 1 3 3 3 3 3 5% 6% 69%	4573
June	1st to 10th	Day	3 2 1 2 3 2 3 4 5% 8% 66%	2660
	11th to 20th	Day	3 2 1 3 2 3 2 3 4 5% 73%	2660
	21st to end	Day	2 2 1 4 3 3 4 4 6% 6% 65%	2629
July	1st to 10th	Day	1 2 1 3 3 3 4 3 5% 7% 69%	4110
	11th to 20th	Day	2 2 1 4 4 5% 6% 6% 9% 11% 51%	4110
	21st to end	Day	4 3 1 4 4 4 4 5% 7% 9% 55%	4454
August	1st to 10th	Day	5% 3 2 5% 5% 6% 7% 7% 10% 11% 38%	4092
	11th to 20th	Day	3 3 1 5% 4 5% 5% 5% 8% 11% 52%	3944
	21st to end	Day	3 3 1 5% 4 5% 6% 5% 9% 9% 49%	4180
September	1st to 10th	Day	6% 4 2 5% 4 4 4 3 5% 7% 55%	2280
	11th to 20th	Day	4 3 2 5% 3 4 5% 4 6% 5% 60%	2197
	21st to end	Day	5% 2 1 4 2 3 2 2 4 5% 70%	2043
October	1st to 10th	Day	4 2 1 3 2 2 2 2 4 4 74%	3170
	11th to 20th	Day	7% 5% 2 5% 4 4 4 3 4 6% 56%	3150
	21st to end	Day	3 4 2 3 2 3 2 3 4 5% 69%	3438
November	1st to 10th	Day	4 4 1 4 3 3 3 3 4 7% 66%	1959
	11th to 20th	Day	4 3 1 3 2 2 2 2 4 5% 70%	1862
	21st to end	Day	5% 7% 3 5% 3 3 3 3 4 4 61%	1600
December	1st to 10th	Day	5% 4 1 3 2 2 2 2 5% 7% 67%	2620
	11th to 20th	Day	5% 5% 2 5% 4 4 3 3 5% 8% 55%	3026
	21st to end	Day	4 9% 2 5% 4 3 3 3 4 6% 56%	4234
January	1st to 10th	Night	3 8% 3 9% 4 4 4 3 4 5% 52%	5867
	11th to 20th	Night	4 7% 2 4 3 3 3 2 3 5% 63%	5880
	21st to end	Night	4 11% 3 6% 3 3 3 3 4 6% 55%	6468
February	1st to 10th	Night	4 8% 2 4 3 3 3 3 5% 6% 59%	2600
	11th to 20th	Night	7% 8% 2 5% 4 3 3 3 5% 6% 55%	2517
	21st to end	Night	5% 10% 2 5% 4 3 3 3 3 6% 56%	1905
March	1st to 10th	Night	5% 10% 3 6% 3 4 4 3 5% 6% 52%	4940
	11th to 20th	Night	5% 10% 3 7% 5% 4 4 4 5% 7% 46%	5000
	21st to end	Night	4 7% 2 7% 4 5% 5% 4 5% 7% 50%	5489
April	1st to 10th	Night	6% 6% 2 5% 4 4 4 4 6% 7% 53%	2040
	11th to 20th	Night	5% 6% 2 6% 4 4 4 3 5% 4 56%	1977
	21st to end	Night	5% 5% 1 5% 4 4 4 3 4 6% 60%	1955
May	1st to 10th	Night	4 4 2 3 3 3 3 3 4 7% 64%	2893
	11th to 20th	Night	5% 4 1 4 4 4 5% 3 5% 6% 58%	2834
	21st to end	Night	4 4 1 4 3 2 2 3 4 6% 67%	2996
June	1st to 10th	Night	3 3 1 2 3 3 3 3 4 7% 67%	1520
	11th to 20th	Night	4 3 1 3 2 2 3 3 4 5% 70%	1520
	21st to end	Night	2 2 2 4 3 4 4 4 6% 7% 62%	1544
July	1st to 10th	Night	3 3 1 5% 3 4 4 4 5% 6% 63%	2860
	11th to 20th	Night	2 3 1 6% 5% 5% 6% 6% 9% 11% 46%	2860
	21st to end	Night	3 3 2 6% 5% 5% 5% 5% 8% 9% 49%	3109
August	1st to 10th	Night	3 5% 3 8% 6% 6% 7% 6% 10% 14% 32%	2847
	11th to 20th	Night	4 4 2 7% 5% 5% 6% 5% 8% 10% 46%	2894
	21st to end	Night	4 4 2 7% 5% 5% 6% 5% 8% 10% 45%	3487
September	1st to 10th	Night	4 3 2 6% 5% 6% 5% 5% 7% 7% 50%	1900
	11th to 20th	Night	4 4 2 6% 3 4 4 3 5% 5% 61%	1979
	21st to end	Night	6% 3 1 3 2 2 2 2 3 5% 69%	2137
October	1st to 10th	Night	5% 2 1 2 2 2 2 2 3 4 75%	3800
	11th to 20th	Night	8% 5% 2 6% 4 4 4 4 4 5% 54%	3778
	21st to end	Night	5% 4 2 3 2 2 2 3 3 5% 70%	4120
November	1st to 10th	Night	5% 4 2 4 2 2 2 3 4 6% 66%	2340
	11th to 20th	Night	3 5% 1 3 2 2 2 2 4 6% 71%	2510
	21st to end	Night	7% 7% 2 4 2 2 2 3 4 5% 63%	2800
December	1st to 10th	Night	4 4 1 3 2 2 2 2 4 7% 68%	4570
	11th to 20th	Night	5% 7% 2 5% 4 3 3 3 5% 7% 57%	5181
	21st to end	Night	5% 8% 2 5% 3 3 3 2 3 5% 60%	6772

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% 4 13% 31% 20% 2	4099
	11th to 20th	Day	23% 5% 15% 21% 21% 15%	4100
	21st to end	Day	28% 4 9% 22% 27% 10%	4510
February	1st to 10th	Day	31% 4 13% 24% 22% 7%	1800
	11th to 20th	Day	33% 5% 10% 23% 24% 5%	1776
	21st to end	Day	32% 5% 8% 15% 32% 9%	1722
March	1st to 10th	Day	25% 4 9% 19% 34% 10%	4954
	11th to 20th	Day	34% 7% 12% 22% 20% 6%	5000
	21st to end	Day	31% 6% 10% 27% 23% 3	5486
April	1st to 10th	Day	26% 4 8% 19% 29% 14%	2359
	11th to 20th	Day	26% 4 8% 17% 28% 17%	2374
	21st to end	Day	22% 5% 9% 19% 31% 15%	2341
May	1st to 10th	Day	21% 5% 7% 12% 29% 26%	4073
	11th to 20th	Day	19% 7% 11% 17% 28% 17%	4074
	21st to end	Day	14% 3 7% 10% 36% 31%	4573
June	1st to 10th	Day	14% 4 6% 15% 30% 30%	2660
	11th to 20th	Day	13% 4 5% 10% 21% 48%	2660
	21st to end	Day	15% 4 6% 13% 25% 36%	2629
July	1st to 10th	Day	15% 4 9% 9% 15% 48%	4046
	11th to 20th	Day	19% 7% 12% 24% 27% 11%	4041
	21st to end	Day	20% 7% 12% 26% 17% 17%	4314
August	1st to 10th	Day	29% 10% 21% 18% 10% 11%	4078
	11th to 20th	Day	23% 7% 16% 16% 18% 20%	3983
	21st to end	Day	24% 8% 14% 18% 22% 13%	4179
September	1st to 10th	Day	26% 5% 9% 15% 22% 23%	2280
	11th to 20th	Day	21% 7% 10% 14% 23% 26%	2197
	21st to end	Day	16% 4 6% 14% 34% 25%	2043
October	1st to 10th	Day	15% 3 6% 12% 30% 34%	3170
	11th to 20th	Day	27% 3 5% 17% 33% 15%	3150
	21st to end	Day	17% 3 6% 21% 43% 9%	3438
November	1st to 10th	Day	18% 2 8% 25% 38% 9%	1959
	11th to 20th	Day	17% 2 8% 28% 37% 8%	1862
	21st to end	Day	26% 4 8% 24% 28% 10%	1600
December	1st to 10th	Day	17% 3 9% 36% 30% 5%	2620
	11th to 20th	Day	27% 5% 9% 37% 22% 1	3024
	21st to end	Day	29% 4 12% 27% 21% 7%	4234
January	1st to 10th	Night	33% 4 8% 30% 21% 3	5867
	11th to 20th	Night	24% 4 12% 22% 22% 16%	5880
	21st to end	Night	31% 4 7% 23% 22% 13%	6468
February	1st to 10th	Night	25% 4 11% 25% 24% 10%	2600
	11th to 20th	Night	30% 4 8% 22% 28% 8%	2518
	21st to end	Night	29% 3 9% 16% 31% 12%	1905
March	1st to 10th	Night	30% 4 7% 15% 32% 12%	4940
	11th to 20th	Night	34% 6% 8% 19% 24% 8%	5000
	21st to end	Night	28% 5% 9% 27% 26% 4	5489
April	1st to 10th	Night	27% 5% 7% 19% 28% 15%	2040
	11th to 20th	Night	28% 5% 6% 13% 28% 19%	1977
	21st to end	Night	23% 4 7% 17% 33% 16%	1955
May	1st to 10th	Night	18% 4 7% 13% 37% 21%	2893
	11th to 20th	Night	21% 7% 9% 18% 27% 18%	2835
	21st to end	Night	17% 3 7% 10% 28% 35%	2996
June	1st to 10th	Night	18% 4 7% 12% 25% 34%	1520
	11th to 20th	Night	16% 3 5% 9% 19% 48%	1520
	21st to end	Night	18% 5% 7% 13% 20% 37%	1544
July	1st to 10th	Night	21% 6% 8% 8% 8% 49%	2815
	11th to 20th	Night	26% 7% 11% 21% 20% 15%	2806
	21st to end	Night	27% 9% 13% 20% 12% 19%	3011
August	1st to 10th	Night	37% 10% 17% 13% 8% 14%	2838
	11th to 20th	Night	31% 7% 15% 13% 12% 23%	2921
	21st to end	Night	31% 7% 11% 19% 17% 15%	3487
September	1st to 10th	Night	29% 7% 10% 15% 14% 25%	1900
	11th to 20th	Night	25% 5% 7% 16% 19% 28%	1979
	21st to end	Night	19% 3 6% 11% 30% 31%	2137
October	1st to 10th	Night	15% 3 5% 10% 25% 44%	3800
	11th to 20th	Night	32% 3 6% 10% 30% 19%	3778
	21st to end	Night	19% 2 5% 17% 43% 15%	4120
November	1st to 10th	Night	19% 3 6% 20% 37% 15%	2340
	11th to 20th	Night	15% 3 6% 24% 40% 12%	2510
	21st to end	Night	24% 3 6% 20% 34% 12%	2800
December	1st to 10th	Night	17% 3 6% 37% 25% 12%	4570
	11th to 20th	Night	26% 4 7% 31% 29% 3	5182
	21st to end	Night	28% 3 10% 26% 25% 7%	6772

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	15% 13% 35% 27% 9% 2	300
	11th to 20th	Day	12% 16% 32% 26% 12% 1	300
	21st to end	Day	9% 13% 31% 31% 14% 2	330
February	1st to 10th	Day	7% 21% 34% 29% 9%	300
	11th to 20th	Day	13% 17% 37% 28% 5%	300
	21st to end	Day	12% 25% 36% 21% 7%	321
March	1st to 10th	Day	13% 22% 32% 21% 11%	500
	11th to 20th	Day	13% 20% 32% 23% 10% 2	500
	21st to end	Day	12% 29% 33% 18% 7% 1	550
April	1st to 10th	Day	11% 22% 33% 22% 10% 2	500
	11th to 20th	Day	13% 27% 33% 19% 7% 1	492
	21st to end	Day	11% 25% 35% 21% 7%	481
May	1st to 10th	Day	10% 21% 38% 24% 7% 1	463
	11th to 20th	Day	8% 16% 32% 29% 14% 2	488
	21st to end	Day	7% 18% 30% 30% 13% 2	586
June	1st to 10th	Day	5% 6% 22% 41% 23% 3	680
	11th to 20th	Day	3 9% 25% 38% 21% 4	680
	21st to end	Day	2 5% 26% 43% 20% 3	649
July	1st to 10th	Day	2 3 21% 45% 27% 2	486
	11th to 20th	Day	2 12% 41% 36% 8%	484
	21st to end	Day	5% 1 18% 39% 32% 6%	531
August	1st to 10th	Day	6% 2 15% 41% 31% 5%	487
	11th to 20th	Day	3 4 22% 38% 27% 6%	477
	21st to end	Day	4 3 21% 43% 24% 6%	539
September	1st to 10th	Day	6% 3 21% 34% 30% 6%	490
	11th to 20th	Day	5% 6% 25% 41% 17% 6%	490
	21st to end	Day	5% 9% 26% 33% 21% 6%	443
October	1st to 10th	Day	7% 12% 23% 22% 25% 11%	300
	11th to 20th	Day	7% 14% 28% 27% 19% 5%	300
	21st to end	Day	8% 15% 23% 32% 19% 3	330
November	1st to 10th	Day	8% 15% 27% 31% 17% 2	300
	11th to 20th	Day	6% 11% 29% 33% 17% 3	300
	21st to end	Day	10% 14% 26% 31% 15% 4	300
December	1st to 10th	Day	11% 12% 24% 34% 16% 3	300
	11th to 20th	Day	10% 14% 29% 28% 16% 3	300
	21st to end	Day	15% 19% 28% 29% 9% 1	330
January	1st to 10th	Night	9% 8% 23% 39% 19% 3	800
	11th to 20th	Night	9% 6% 26% 36% 21% 2	800
	21st to end	Night	10% 7% 28% 34% 18% 4	880
February	1st to 10th	Night	9% 7% 32% 38% 13% 2	800
	11th to 20th	Night	10% 7% 33% 36% 13% 1	784
	21st to end	Night	12% 8% 31% 37% 11%	660
March	1st to 10th	Night	9% 7% 31% 36% 15% 2	800
	11th to 20th	Night	8% 8% 26% 37% 19% 2	800
	21st to end	Night	9% 12% 29% 35% 14% 2	880
April	1st to 10th	Night	9% 11% 29% 40% 10% 1	640
	11th to 20th	Night	8% 16% 25% 35% 15% 1	593
	21st to end	Night	6% 12% 29% 37% 14% 1	587
May	1st to 10th	Night	8% 9% 26% 40% 15% 1	570
	11th to 20th	Night	9% 5% 24% 39% 20% 3	561
	21st to end	Night	9% 7% 23% 37% 21% 2	617
June	1st to 10th	Night	3 5% 18% 45% 28% 1	570
	11th to 20th	Night	4 6% 16% 46% 26% 2	570
	21st to end	Night	2 3 16% 46% 31% 2	570
July	1st to 10th	Night	5% 1 12% 40% 39% 2	555
	11th to 20th	Night	3 1 9% 38% 43% 6%	552
	21st to end	Night	6% 2 8% 32% 46% 6%	624
August	1st to 10th	Night	4 1 7% 35% 45% 9%	567
	11th to 20th	Night	6% 2 10% 37% 41% 5%	564
	21st to end	Night	5% 1 10% 37% 41% 6%	627
September	1st to 10th	Night	5% 1 10% 38% 42% 3	570
	11th to 20th	Night	5% 2 14% 41% 33% 5%	649
	21st to end	Night	7% 3 16% 39% 31% 5%	760
October	1st to 10th	Night	9% 5% 21% 37% 25% 3	760
	11th to 20th	Night	5% 4 18% 45% 24% 4	760
	21st to end	Night	5% 7% 19% 39% 26% 5%	836
November	1st to 10th	Night	7% 4 19% 43% 23% 4	780
	11th to 20th	Night	6% 5% 23% 42% 20% 5%	875
	21st to end	Night	12% 8% 19% 37% 20% 4	1000
December	1st to 10th	Night	9% 8% 21% 42% 19% 2	1000
	11th to 20th	Night	12% 9% 26% 34% 19% 1	1000
	21st to end	Night	11% 11% 25% 37% 14% 2	1015

Page generated at 2025-04-23 07:25:07. Version ac07

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