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 2026-08-30.

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 4 3 4 4 4 5% 7% 59%	151983
	Night	4 6% 2 5% 3 4 4 3 5% 7% 58%	147817
Transparency	Day	22% 5% 10% 20% 26% 17%	146875
	Night	25% 4 8% 20% 25% 17%	143932
Seeing	Day	8% 13% 28% 32% 17% 3	17483
	Night	7% 6% 22% 39% 23% 3	27686

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	4 10% 3 6% 4 4 4 3 5% 6% 51%	5318
	11th to 20th	Day	2 4 1 4 3 3 3 3 4 4 68%	5340
	21st to end	Day	4 8% 2 5% 3 3 3 3 4 4 60%	5844
February	1st to 10th	Day	4 8% 2 7% 5% 4 3 3 4 6% 54%	1890
	11th to 20th	Day	5% 10% 2 8% 5% 4 5% 3 4 6% 48%	1858
	21st to end	Day	5% 11% 3 5% 4 2 4 3 4 5% 53%	1806
March	1st to 10th	Day	4 8% 2 5% 3 4 4 3 6% 7% 54%	5064
	11th to 20th	Day	3 10% 4 8% 5% 5% 5% 5% 5% 7% 42%	5110
	21st to end	Day	4 8% 3 7% 5% 4 5% 4 6% 9% 45%	5607
April	1st to 10th	Day	5% 5% 2 6% 4 4 4 4 5% 7% 54%	2477
	11th to 20th	Day	3 6% 2 6% 4 5% 5% 4 5% 8% 53%	2491
	21st to end	Day	4 4 2 5% 4 4 4 4 6% 7% 57%	2520
May	1st to 10th	Day	4 4 2 5% 4 5% 5% 4 6% 7% 54%	7563
	11th to 20th	Day	3 3 1 3 3 3 4 4 6% 7% 64%	7596
	21st to end	Day	2 2 1 3 3 3 3 3 5% 6% 70%	8550
June	1st to 10th	Day	3 3 1 3 2 2 3 4 5% 8% 66%	2940
	11th to 20th	Day	3 2 1 3 2 3 2 3 4 5% 74%	2940
	21st to end	Day	2 2 1 4 3 3 4 4 6% 6% 67%	2905
July	1st to 10th	Day	1 1 1 3 2 2 3 3 5% 6% 73%	7649
	11th to 20th	Day	2 2 1 4 4 5% 6% 6% 8% 10% 51%	7650
	21st to end	Day	2 2 1 3 3 4 4 5% 7% 10% 58%	8304
August	1st to 10th	Day	3 2 1 4 4 5% 6% 5% 8% 10% 51%	5909
	11th to 20th	Day	2 2 1 4 4 4 4 4 7% 10% 58%	5802
	21st to end	Day	3 3 1 5% 4 5% 7% 5% 9% 10% 48%	6093
September	1st to 10th	Day	6% 4 2 5% 4 4 4 4 5% 7% 55%	2400
	11th to 20th	Day	4 3 2 5% 3 4 5% 4 6% 5% 60%	2312
	21st to end	Day	5% 2 1 3 3 3 3 2 4 5% 69%	2150
October	1st to 10th	Day	4 2 1 3 2 2 2 2 4 4 74%	3270
	11th to 20th	Day	7% 5% 2 5% 3 4 4 3 4 6% 57%	3250
	21st to end	Day	3 4 2 3 2 3 2 3 4 5% 69%	3548
November	1st to 10th	Day	4 3 1 4 3 2 3 3 4 7% 67%	2059
	11th to 20th	Day	4 3 1 3 2 2 3 3 4 6% 69%	1955
	21st to end	Day	5% 7% 3 4 3 3 3 3 4 4 61%	1680
December	1st to 10th	Day	5% 4 1 3 2 2 2 2 5% 7% 67%	2700
	11th to 20th	Day	5% 5% 2 5% 4 4 3 3 5% 8% 56%	3106
	21st to end	Day	4 9% 2 5% 4 3 3 3 4 6% 56%	4327
January	1st to 10th	Night	4 10% 3 9% 5% 5% 4 3 4 5% 48%	7605
	11th to 20th	Night	3 5% 2 3 2 3 3 2 3 5% 68%	7650
	21st to end	Night	4 10% 3 6% 3 3 2 2 4 6% 58%	8370
February	1st to 10th	Night	4 8% 2 4 3 3 3 3 5% 6% 60%	2730
	11th to 20th	Night	7% 9% 2 5% 4 3 3 3 5% 6% 54%	2646
	21st to end	Night	5% 10% 2 5% 3 3 3 2 3 6% 57%	1997
March	1st to 10th	Night	5% 10% 3 6% 3 4 4 3 5% 6% 53%	5050
	11th to 20th	Night	5% 9% 3 7% 5% 4 4 4 5% 7% 47%	5110
	21st to end	Night	4 7% 2 6% 4 5% 5% 4 5% 7% 51%	5610
April	1st to 10th	Night	6% 7% 2 5% 4 4 4 4 6% 7% 54%	2142
	11th to 20th	Night	5% 6% 2 6% 4 4 5% 3 5% 4 56%	2077
	21st to end	Night	5% 5% 1 5% 4 4 4 3 4 6% 60%	2100
May	1st to 10th	Night	4 4 2 5% 3 4 4 3 5% 7% 59%	5380
	11th to 20th	Night	4 4 2 5% 3 3 4 3 5% 6% 62%	5296
	21st to end	Night	3 3 1 3 3 2 3 3 4 6% 68%	5639
June	1st to 10th	Night	3 3 1 2 3 3 4 3 4 6% 67%	1680
	11th to 20th	Night	4 2 1 3 2 2 3 2 4 5% 72%	1680
	21st to end	Night	2 2 2 4 3 4 4 4 6% 6% 64%	1707
July	1st to 10th	Night	2 2 1 4 3 4 4 4 5% 6% 66%	5340
	11th to 20th	Night	3 3 2 7% 4 4 6% 6% 9% 11% 45%	5340
	21st to end	Night	3 3 2 5% 5% 5% 6% 6% 9% 11% 45%	5805
August	1st to 10th	Night	3 3 2 6% 5% 5% 6% 5% 9% 11% 44%	4123
	11th to 20th	Night	3 4 2 6% 4 4 5% 4 7% 9% 53%	4265
	21st to end	Night	5% 4 2 8% 6% 6% 6% 5% 7% 10% 40%	5083
September	1st to 10th	Night	4 3 2 6% 5% 6% 5% 5% 7% 8% 50%	2000
	11th to 20th	Night	4 4 2 6% 3 4 4 3 5% 5% 61%	2083
	21st to end	Night	6% 3 1 3 2 2 2 3 4 5% 68%	2250
October	1st to 10th	Night	5% 2 1 2 2 2 2 2 3 4 75%	3920
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 4 5% 54%	3898
	21st to end	Night	5% 4 2 3 2 2 2 3 3 5% 70%	4252
November	1st to 10th	Night	5% 4 2 4 2 2 2 3 4 6% 67%	2460
	11th to 20th	Night	3 5% 1 3 2 2 3 2 4 6% 69%	2636
	21st to end	Night	7% 7% 2 4 3 2 2 3 5% 5% 62%	2940
December	1st to 10th	Night	4 4 1 3 2 2 2 2 4 7% 68%	4710
	11th to 20th	Night	5% 7% 2 5% 4 3 3 3 5% 7% 57%	5321
	21st to end	Night	5% 8% 2 5% 3 3 3 2 3 5% 60%	6922

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	33% 4 15% 30% 17% 2	5321
	11th to 20th	Day	17% 4 11% 23% 31% 14%	5340
	21st to end	Day	27% 4 7% 21% 32% 9%	5844
February	1st to 10th	Day	30% 4 12% 24% 23% 7%	1890
	11th to 20th	Day	34% 5% 10% 22% 24% 4	1867
	21st to end	Day	31% 5% 8% 17% 31% 9%	1806
March	1st to 10th	Day	24% 3 9% 19% 34% 10%	5064
	11th to 20th	Day	33% 7% 12% 22% 20% 6%	5110
	21st to end	Day	30% 5% 10% 27% 24% 3	5607
April	1st to 10th	Day	26% 4 7% 20% 28% 14%	2477
	11th to 20th	Day	26% 5% 8% 18% 27% 16%	2494
	21st to end	Day	21% 4 9% 19% 31% 15%	2520
May	1st to 10th	Day	24% 5% 9% 18% 27% 16%	7563
	11th to 20th	Day	16% 4 8% 14% 38% 20%	7599
	21st to end	Day	13% 3 6% 13% 39% 26%	8551
June	1st to 10th	Day	15% 4 6% 16% 30% 29%	2940
	11th to 20th	Day	13% 3 5% 9% 22% 48%	2940
	21st to end	Day	14% 4 6% 13% 23% 40%	2905
July	1st to 10th	Day	12% 3 7% 6% 13% 58%	7586
	11th to 20th	Day	21% 7% 14% 24% 21% 14%	7581
	21st to end	Day	17% 6% 16% 27% 19% 14%	8120
August	1st to 10th	Day	28% 9% 20% 18% 12% 12%	4338
	11th to 20th	Day	23% 7% 16% 17% 18% 19%	4237
	21st to end	Day	24% 8% 15% 19% 22% 12%	4420
September	1st to 10th	Day	26% 6% 9% 15% 22% 22%	2400
	11th to 20th	Day	21% 6% 10% 14% 24% 25%	2312
	21st to end	Day	17% 4 6% 14% 33% 25%	2150
October	1st to 10th	Day	15% 3 6% 12% 31% 34%	3270
	11th to 20th	Day	27% 3 5% 17% 33% 15%	3250
	21st to end	Day	17% 3 6% 21% 43% 10%	3548
November	1st to 10th	Day	18% 3 7% 26% 38% 8%	2059
	11th to 20th	Day	17% 2 8% 28% 36% 8%	1955
	21st to end	Day	26% 4 8% 25% 27% 10%	1680
December	1st to 10th	Day	17% 3 9% 37% 30% 5%	2700
	11th to 20th	Day	26% 5% 9% 37% 22% 1	3104
	21st to end	Day	29% 4 12% 26% 21% 7%	4327
January	1st to 10th	Night	38% 4 10% 27% 18% 3	7605
	11th to 20th	Night	19% 3 10% 24% 29% 15%	7650
	21st to end	Night	29% 3 6% 21% 28% 15%	8370
February	1st to 10th	Night	25% 4 11% 25% 25% 10%	2730
	11th to 20th	Night	31% 4 8% 22% 27% 8%	2647
	21st to end	Night	28% 3 9% 17% 31% 12%	1997
March	1st to 10th	Night	29% 4 7% 15% 33% 12%	5050
	11th to 20th	Night	34% 6% 8% 19% 25% 8%	5110
	21st to end	Night	28% 5% 9% 27% 26% 5%	5610
April	1st to 10th	Night	27% 4 6% 19% 28% 16%	2142
	11th to 20th	Night	29% 5% 6% 14% 28% 19%	2077
	21st to end	Night	23% 4 7% 16% 34% 16%	2100
May	1st to 10th	Night	22% 4 10% 20% 29% 15%	5378
	11th to 20th	Night	21% 5% 6% 13% 34% 22%	5297
	21st to end	Night	17% 2 6% 10% 34% 31%	5640
June	1st to 10th	Night	18% 4 6% 12% 26% 34%	1680
	11th to 20th	Night	16% 3 5% 9% 18% 49%	1680
	21st to end	Night	18% 5% 7% 12% 18% 40%	1707
July	1st to 10th	Night	19% 4 8% 7% 10% 53%	5295
	11th to 20th	Night	28% 7% 13% 20% 14% 17%	5286
	21st to end	Night	28% 7% 15% 22% 13% 15%	5677
August	1st to 10th	Night	36% 10% 17% 13% 9% 16%	3018
	11th to 20th	Night	30% 7% 14% 14% 12% 23%	3106
	21st to end	Night	31% 7% 11% 20% 16% 14%	3687
September	1st to 10th	Night	28% 7% 11% 15% 15% 25%	2000
	11th to 20th	Night	25% 5% 7% 16% 19% 28%	2083
	21st to end	Night	20% 3 6% 11% 30% 30%	2250
October	1st to 10th	Night	15% 3 5% 9% 25% 43%	3920
	11th to 20th	Night	32% 3 6% 10% 31% 18%	3898
	21st to end	Night	18% 2 5% 17% 42% 15%	4252
November	1st to 10th	Night	18% 3 6% 20% 38% 15%	2460
	11th to 20th	Night	16% 3 6% 24% 39% 11%	2636
	21st to end	Night	25% 3 6% 21% 33% 12%	2940
December	1st to 10th	Night	17% 3 6% 37% 25% 11%	4710
	11th to 20th	Night	26% 4 7% 31% 29% 3	5322
	21st to end	Night	28% 3 10% 26% 26% 7%	6922

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	16% 13% 35% 27% 8% 2	330
	11th to 20th	Day	12% 16% 31% 26% 13% 1	330
	21st to end	Day	10% 13% 33% 30% 13% 1	363
February	1st to 10th	Day	7% 19% 33% 30% 10% 1	330
	11th to 20th	Day	14% 17% 37% 27% 5%	330
	21st to end	Day	11% 24% 36% 21% 7%	349
March	1st to 10th	Day	12% 22% 33% 22% 11%	540
	11th to 20th	Day	14% 20% 32% 23% 10% 2	540
	21st to end	Day	12% 28% 34% 19% 7% 1	594
April	1st to 10th	Day	11% 22% 32% 23% 11% 2	540
	11th to 20th	Day	13% 26% 34% 19% 7% 1	532
	21st to end	Day	11% 28% 34% 20% 7%	540
May	1st to 10th	Day	10% 20% 40% 23% 7% 1	543
	11th to 20th	Day	8% 17% 32% 28% 13% 2	568
	21st to end	Day	7% 17% 31% 30% 13% 2	680
June	1st to 10th	Day	5% 7% 24% 40% 22% 3	780
	11th to 20th	Day	3 9% 27% 37% 20% 4	780
	21st to end	Day	2 7% 28% 41% 19% 3	745
July	1st to 10th	Day	2 4 20% 46% 25% 2	566
	11th to 20th	Day	3 1 12% 41% 35% 8%	564
	21st to end	Day	4 19% 41% 30% 6%	619
August	1st to 10th	Day	5% 3 17% 41% 28% 5%	567
	11th to 20th	Day	3 4 20% 39% 27% 7%	557
	21st to end	Day	4 3 20% 44% 24% 6%	620
September	1st to 10th	Day	6% 3 22% 35% 28% 6%	530
	11th to 20th	Day	5% 7% 25% 40% 17% 5%	530
	21st to end	Day	5% 10% 26% 33% 20% 6%	480
October	1st to 10th	Day	7% 12% 25% 22% 24% 10%	330
	11th to 20th	Day	8% 15% 29% 26% 17% 5%	330
	21st to end	Day	8% 15% 24% 32% 19% 3	363
November	1st to 10th	Day	7% 14% 27% 32% 17% 3	330
	11th to 20th	Day	7% 11% 28% 33% 17% 4	330
	21st to end	Day	10% 14% 27% 30% 15% 4	330
December	1st to 10th	Day	10% 14% 26% 34% 15% 2	330
	11th to 20th	Day	9% 13% 30% 28% 16% 4	330
	21st to end	Day	14% 18% 28% 30% 8% 1	363
January	1st to 10th	Night	9% 8% 23% 39% 18% 3	840
	11th to 20th	Night	8% 6% 26% 35% 21% 2	840
	21st to end	Night	10% 7% 28% 34% 17% 3	924
February	1st to 10th	Night	8% 7% 31% 38% 13% 2	840
	11th to 20th	Night	11% 8% 33% 35% 12% 1	824
	21st to end	Night	12% 8% 33% 37% 11%	692
March	1st to 10th	Night	8% 7% 31% 38% 15% 2	840
	11th to 20th	Night	8% 9% 26% 37% 19% 2	840
	21st to end	Night	8% 12% 28% 36% 14% 2	924
April	1st to 10th	Night	8% 11% 29% 40% 11% 1	672
	11th to 20th	Night	8% 15% 26% 36% 14% 1	623
	21st to end	Night	6% 12% 31% 36% 14% 1	630
May	1st to 10th	Night	8% 9% 27% 40% 15% 1	630
	11th to 20th	Night	9% 5% 25% 38% 20% 3	621
	21st to end	Night	9% 7% 23% 39% 20% 2	683
June	1st to 10th	Night	3 4 18% 45% 27% 1	630
	11th to 20th	Night	4 5% 16% 48% 25% 2	630
	21st to end	Night	2 3 18% 46% 29% 2	630
July	1st to 10th	Night	5% 1 12% 44% 37% 2	615
	11th to 20th	Night	3 1 9% 38% 42% 5%	612
	21st to end	Night	5% 2 9% 34% 44% 6%	690
August	1st to 10th	Night	4 1 7% 37% 44% 8%	627
	11th to 20th	Night	6% 2 10% 37% 40% 5%	624
	21st to end	Night	5% 1 10% 37% 41% 5%	687
September	1st to 10th	Night	5% 1 10% 41% 41% 3	600
	11th to 20th	Night	5% 3 15% 41% 32% 4	683
	21st to end	Night	7% 3 16% 39% 30% 5%	800
October	1st to 10th	Night	9% 6% 21% 37% 25% 3	800
	11th to 20th	Night	6% 4 20% 44% 23% 3	800
	21st to end	Night	5% 8% 19% 40% 25% 5%	880
November	1st to 10th	Night	7% 4 20% 43% 23% 4	820
	11th to 20th	Night	6% 5% 22% 42% 20% 5%	919
	21st to end	Night	11% 8% 20% 37% 20% 4	1050
December	1st to 10th	Night	9% 8% 22% 41% 18% 2	1050
	11th to 20th	Night	12% 8% 26% 34% 19% 1	1050
	21st to end	Night	11% 11% 26% 37% 13% 2	1066

Page generated at 2026-08-27 02:07:12. Version ac07

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