Pagosa Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pagosa Springs clear sky chart from 2005-11-06 to 2026-03-18.

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 6% 2 5% 4 4 4 4 6% 7% 55%	139904
	Night	5% 7% 2 5% 3 3 4 3 5% 7% 56%	139111
Transparency	Day	27% 6% 10% 22% 25% 11%	134838
	Night	28% 5% 10% 24% 24% 10%	135183
Seeing	Day	10% 13% 28% 29% 16% 4	17012
	Night	9% 5% 24% 41% 19% 2	27283

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	2 12% 4 8% 4 3 3 3 4 5% 52%	5158
	11th to 20th	Day	2 7% 2 4 2 2 2 2 3 6% 67%	5340
	21st to end	Day	4 9% 3 5% 3 3 3 3 4 5% 58%	5844
February	1st to 10th	Day	3 12% 3 6% 4 3 3 3 4 5% 55%	1890
	11th to 20th	Day	6% 12% 3 7% 4 3 4 3 5% 7% 45%	1953
	21st to end	Day	3 14% 4 7% 3 3 3 3 3 6% 50%	1730
March	1st to 10th	Day	3 11% 2 5% 4 4 4 4 5% 8% 50%	4972
	11th to 20th	Day	4 14% 3 7% 5% 5% 5% 4 6% 6% 39%	5078
	21st to end	Day	4 11% 3 6% 5% 4 5% 4 5% 7% 46%	5568
April	1st to 10th	Day	5% 7% 2 5% 4 4 4 4 5% 8% 53%	2400
	11th to 20th	Day	4 8% 2 4 4 4 5% 5% 7% 7% 50%	2371
	21st to end	Day	6% 6% 2 5% 5% 4 4 4 5% 8% 52%	2400
May	1st to 10th	Day	6% 6% 2 5% 4 4 5% 4 6% 7% 50%	5562
	11th to 20th	Day	4 5% 1 4 4 5% 5% 4 7% 7% 53%	5932
	21st to end	Day	3 2 1 3 3 3 4 4 5% 6% 65%	6925
June	1st to 10th	Day	4 2 1 3 4 3 4 4 6% 8% 60%	2800
	11th to 20th	Day	3 2 1 3 3 2 3 3 4 5% 70%	2800
	21st to end	Day	3 2 1 4 4 4 5% 5% 7% 8% 58%	2800
July	1st to 10th	Day	3 2 1 3 4 4 5% 4 6% 6% 62%	6305
	11th to 20th	Day	1 2 1 4 5% 7% 9% 8% 11% 11% 42%	5880
	21st to end	Day	3 3 1 5% 5% 6% 7% 6% 8% 9% 47%	6401
August	1st to 10th	Day	4 3 1 5% 5% 6% 6% 5% 8% 11% 45%	5779
	11th to 20th	Day	3 2 1 4 4 5% 5% 5% 8% 9% 53%	5492
	21st to end	Day	6% 3 2 6% 5% 6% 7% 6% 9% 10% 39%	5984
September	1st to 10th	Day	7% 5% 2 5% 4 5% 5% 4 7% 7% 50%	2400
	11th to 20th	Day	8% 4 2 5% 4 4 4 5% 4 6% 54%	2400
	21st to end	Day	10% 3 1 4 3 2 3 3 4 5% 63%	2125
October	1st to 10th	Day	6% 2 1 3 2 2 2 2 4 5% 69%	3270
	11th to 20th	Day	13% 5% 1 4 3 3 4 3 5% 5% 54%	3250
	21st to end	Day	6% 5% 2 3 2 2 2 2 3 5% 68%	3548
November	1st to 10th	Day	5% 5% 1 2 2 2 2 2 4 6% 70%	2011
	11th to 20th	Day	3 4 1 3 2 2 2 2 4 5% 71%	1890
	21st to end	Day	6% 9% 2 3 3 3 2 1 4 4 62%	1748
December	1st to 10th	Day	4 5% 1 3 1 1 1 2 3 7% 71%	2700
	11th to 20th	Day	4 8% 2 4 3 2 3 3 4 6% 61%	3106
	21st to end	Day	4 9% 3 6% 3 3 3 3 4 5% 57%	4092
January	1st to 10th	Night	3 10% 4 9% 4 4 4 3 5% 6% 49%	7806
	11th to 20th	Night	2 8% 2 4 2 2 2 2 4 6% 67%	7650
	21st to end	Night	4 11% 3 6% 4 3 3 2 4 5% 56%	8370
February	1st to 10th	Night	5% 11% 3 5% 2 2 2 3 3 5% 60%	2730
	11th to 20th	Night	7% 11% 3 5% 3 2 4 3 3 5% 55%	2553
	21st to end	Night	5% 13% 4 5% 2 2 2 2 4 5% 55%	2076
March	1st to 10th	Night	4 14% 3 7% 3 3 4 3 4 5% 50%	5125
	11th to 20th	Night	7% 12% 3 6% 4 3 3 3 5% 6% 49%	5077
	21st to end	Night	7% 10% 2 6% 3 4 4 3 4 6% 50%	5403
April	1st to 10th	Night	7% 9% 2 4 3 3 4 3 5% 6% 55%	2000
	11th to 20th	Night	8% 6% 2 5% 4 4 3 4 5% 6% 53%	1977
	21st to end	Night	7% 6% 1 4 3 3 3 4 4 5% 59%	2000
May	1st to 10th	Night	8% 6% 2 5% 4 3 3 4 5% 6% 52%	4413
	11th to 20th	Night	5% 4 1 3 3 3 4 4 5% 8% 60%	3968
	21st to end	Night	5% 3 1 3 3 4 3 3 4 5% 66%	3972
June	1st to 10th	Night	3 3 2 3 3 3 5% 3 4 7% 64%	1600
	11th to 20th	Night	3 3 1 3 3 3 3 3 4 5% 70%	1600
	21st to end	Night	4 2 1 5% 3 4 5% 5% 6% 7% 58%	1600
July	1st to 10th	Night	3 3 2 5% 4 4 4 4 6% 6% 58%	3655
	11th to 20th	Night	2 3 1 5% 5% 5% 6% 6% 11% 13% 43%	4100
	21st to end	Night	4 3 2 6% 5% 6% 7% 7% 9% 10% 41%	4472
August	1st to 10th	Night	4 3 2 7% 5% 6% 6% 4 8% 11% 44%	4033
	11th to 20th	Night	3 3 2 6% 4 5% 6% 6% 8% 11% 46%	4357
	21st to end	Night	8% 5% 3 8% 6% 6% 7% 6% 8% 11% 31%	4993
September	1st to 10th	Night	6% 4 2 6% 5% 5% 5% 4 7% 9% 47%	2000
	11th to 20th	Night	8% 3 2 5% 4 4 4 3 5% 6% 57%	2000
	21st to end	Night	8% 4 2 4 2 3 3 3 4 5% 63%	2270
October	1st to 10th	Night	8% 3 1 3 2 2 2 2 4 5% 69%	3920
	11th to 20th	Night	12% 5% 2 5% 3 3 3 3 4 6% 55%	3898
	21st to end	Night	7% 5% 1 3 2 2 2 2 3 4 68%	4252
November	1st to 10th	Night	5% 5% 1 3 2 2 2 2 4 5% 68%	2485
	11th to 20th	Night	3 5% 1 3 2 2 3 2 3 5% 72%	2730
	21st to end	Night	7% 10% 2 4 2 2 2 2 3 5% 59%	2867
December	1st to 10th	Night	4 6% 2 4 2 2 2 2 3 4 72%	4710
	11th to 20th	Night	4 7% 2 4 2 2 3 3 4 6% 63%	5321
	21st to end	Night	5% 10% 3 6% 3 3 3 2 3 5% 55%	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	34% 4 12% 30% 16% 3	5161
	11th to 20th	Day	19% 6% 11% 26% 27% 11%	5340
	21st to end	Day	29% 4 7% 27% 25% 9%	5844
February	1st to 10th	Day	32% 4 13% 25% 21% 6%	1890
	11th to 20th	Day	39% 4 8% 26% 21% 3	1962
	21st to end	Day	38% 3 6% 18% 29% 7%	1730
March	1st to 10th	Day	31% 4 5% 20% 30% 9%	4972
	11th to 20th	Day	41% 5% 8% 25% 18% 3	5078
	21st to end	Day	35% 6% 9% 29% 19% 2	5568
April	1st to 10th	Day	29% 5% 7% 23% 25% 11%	2400
	11th to 20th	Day	29% 6% 7% 20% 27% 11%	2374
	21st to end	Day	29% 5% 6% 23% 29% 7%	2400
May	1st to 10th	Day	29% 7% 11% 20% 21% 12%	5562
	11th to 20th	Day	25% 7% 7% 21% 32% 9%	5935
	21st to end	Day	16% 6% 5% 15% 41% 17%	6926
June	1st to 10th	Day	19% 5% 8% 24% 27% 17%	2800
	11th to 20th	Day	15% 4 4 15% 27% 35%	2800
	21st to end	Day	21% 5% 7% 17% 24% 25%	2800
July	1st to 10th	Day	19% 6% 9% 10% 20% 37%	6237
	11th to 20th	Day	25% 10% 18% 28% 13% 7%	5811
	21st to end	Day	27% 9% 19% 19% 19% 8%	6217
August	1st to 10th	Day	36% 10% 19% 15% 12% 7%	4208
	11th to 20th	Day	25% 8% 15% 19% 18% 14%	3974
	21st to end	Day	32% 9% 14% 21% 18% 6%	4311
September	1st to 10th	Day	30% 6% 10% 19% 23% 12%	2400
	11th to 20th	Day	28% 6% 8% 17% 26% 16%	2400
	21st to end	Day	23% 4 5% 22% 35% 12%	2125
October	1st to 10th	Day	18% 3 6% 17% 32% 25%	3270
	11th to 20th	Day	30% 5% 5% 22% 29% 9%	3250
	21st to end	Day	21% 3 5% 25% 41% 5%	3548
November	1st to 10th	Day	18% 3 8% 31% 34% 6%	2011
	11th to 20th	Day	17% 3 7% 34% 33% 6%	1890
	21st to end	Day	28% 3 6% 28% 25% 9%	1748
December	1st to 10th	Day	17% 2 11% 32% 33% 5%	2700
	11th to 20th	Day	25% 4 9% 38% 23% 2	3104
	21st to end	Day	29% 4 11% 25% 26% 5%	4092
January	1st to 10th	Night	37% 5% 12% 26% 17% 4	7807
	11th to 20th	Night	20% 5% 11% 30% 24% 11%	7650
	21st to end	Night	31% 3 7% 31% 19% 9%	8370
February	1st to 10th	Night	29% 4 11% 28% 21% 7%	2730
	11th to 20th	Night	35% 4 9% 27% 21% 5%	2554
	21st to end	Night	32% 3 7% 21% 30% 7%	2076
March	1st to 10th	Night	37% 4 4 19% 29% 8%	5125
	11th to 20th	Night	35% 4 7% 23% 23% 6%	5077
	21st to end	Night	34% 6% 8% 31% 18% 3	5403
April	1st to 10th	Night	32% 4 6% 20% 26% 12%	2000
	11th to 20th	Night	31% 5% 6% 18% 29% 12%	1977
	21st to end	Night	28% 4 5% 24% 29% 9%	2000
May	1st to 10th	Night	30% 7% 11% 17% 24% 10%	4410
	11th to 20th	Night	21% 6% 10% 26% 25% 12%	3969
	21st to end	Night	20% 5% 7% 15% 33% 20%	3972
June	1st to 10th	Night	21% 5% 9% 17% 26% 22%	1600
	11th to 20th	Night	16% 3 6% 14% 22% 40%	1600
	21st to end	Night	23% 6% 8% 14% 22% 27%	1600
July	1st to 10th	Night	25% 6% 10% 7% 15% 37%	3615
	11th to 20th	Night	25% 9% 21% 28% 7% 10%	4046
	21st to end	Night	33% 10% 19% 16% 15% 6%	4344
August	1st to 10th	Night	39% 10% 20% 10% 12% 8%	2928
	11th to 20th	Night	32% 8% 20% 11% 17% 12%	3151
	21st to end	Night	40% 8% 14% 19% 14% 6%	3597
September	1st to 10th	Night	31% 7% 13% 18% 18% 13%	2000
	11th to 20th	Night	28% 5% 9% 15% 24% 19%	2000
	21st to end	Night	23% 5% 6% 17% 37% 13%	2270
October	1st to 10th	Night	19% 3 6% 14% 36% 22%	3920
	11th to 20th	Night	30% 4 5% 19% 31% 9%	3898
	21st to end	Night	21% 3 5% 25% 39% 7%	4252
November	1st to 10th	Night	19% 2 7% 29% 35% 7%	2485
	11th to 20th	Night	17% 4 5% 35% 33% 6%	2730
	21st to end	Night	31% 2 7% 26% 28% 6%	2867
December	1st to 10th	Night	19% 2 9% 42% 23% 4	4710
	11th to 20th	Night	24% 3 9% 35% 27% 1	5322
	21st to end	Night	33% 4 11% 24% 24% 3	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	15% 10% 31% 33% 9% 2	330
	11th to 20th	Day	15% 12% 33% 31% 8% 1	330
	21st to end	Day	7% 9% 36% 37% 7% 2	363
February	1st to 10th	Day	10% 18% 33% 31% 6% 2	330
	11th to 20th	Day	16% 20% 32% 27% 5%	330
	21st to end	Day	15% 21% 34% 23% 6%	273
March	1st to 10th	Day	16% 24% 27% 26% 6% 1	496
	11th to 20th	Day	15% 22% 31% 23% 8% 1	529
	21st to end	Day	18% 29% 33% 14% 6%	550
April	1st to 10th	Day	13% 28% 33% 18% 6% 1	500
	11th to 20th	Day	17% 33% 29% 15% 5% 1	492
	21st to end	Day	13% 27% 35% 17% 6% 1	500
May	1st to 10th	Day	14% 25% 36% 17% 7% 1	503
	11th to 20th	Day	12% 18% 32% 25% 11% 2	567
	21st to end	Day	10% 17% 28% 28% 14% 3	789
June	1st to 10th	Day	5% 8% 27% 35% 21% 4	730
	11th to 20th	Day	5% 9% 34% 30% 18% 5%	730
	21st to end	Day	3 10% 27% 34% 21% 6%	730
July	1st to 10th	Day	4 4 19% 34% 31% 7%	713
	11th to 20th	Day	5% 3 15% 33% 31% 13%	524
	21st to end	Day	7% 2 16% 32% 32% 11%	575
August	1st to 10th	Day	7% 5% 20% 39% 20% 9%	527
	11th to 20th	Day	4 4 20% 36% 26% 10%	517
	21st to end	Day	7% 3 22% 34% 26% 7%	583
September	1st to 10th	Day	8% 6% 22% 32% 24% 9%	530
	11th to 20th	Day	8% 7% 32% 36% 14% 3	530
	21st to end	Day	10% 10% 24% 30% 18% 7%	405
October	1st to 10th	Day	13% 11% 19% 26% 24% 7%	330
	11th to 20th	Day	15% 13% 25% 28% 18% 2	330
	21st to end	Day	10% 13% 24% 33% 17% 3	363
November	1st to 10th	Day	10% 16% 24% 35% 13% 2	330
	11th to 20th	Day	4 14% 28% 35% 17% 2	330
	21st to end	Day	15% 10% 27% 31% 16% 1	330
December	1st to 10th	Day	11% 14% 29% 30% 12% 4	330
	11th to 20th	Day	8% 10% 32% 32% 15% 3	330
	21st to end	Day	18% 12% 31% 30% 7% 1	363
January	1st to 10th	Night	9% 6% 26% 42% 14% 2	915
	11th to 20th	Night	8% 5% 31% 40% 15% 2	840
	21st to end	Night	11% 6% 28% 42% 12% 3	924
February	1st to 10th	Night	11% 5% 34% 40% 9% 1	840
	11th to 20th	Night	11% 7% 33% 41% 8%	824
	21st to end	Night	14% 5% 36% 39% 5%	692
March	1st to 10th	Night	11% 10% 30% 39% 10% 1	840
	11th to 20th	Night	9% 9% 27% 39% 15% 1	828
	21st to end	Night	11% 10% 31% 38% 9% 1	845
April	1st to 10th	Night	12% 9% 37% 35% 7%	600
	11th to 20th	Night	12% 9% 35% 35% 9% 1	593
	21st to end	Night	10% 9% 34% 35% 12% 1	600
May	1st to 10th	Night	9% 9% 30% 40% 13%	600
	11th to 20th	Night	11% 5% 26% 43% 14% 1	591
	21st to end	Night	11% 7% 25% 39% 18% 1	650
June	1st to 10th	Night	4 3 21% 49% 22% 1	600
	11th to 20th	Night	3 5% 21% 49% 20% 1	600
	21st to end	Night	4 3 17% 44% 31% 1	600
July	1st to 10th	Night	3 1 11% 50% 33% 1	585
	11th to 20th	Night	3 1 7% 41% 42% 7%	582
	21st to end	Night	6% 1 7% 34% 47% 5%	657
August	1st to 10th	Night	5% 1 7% 36% 48% 3	597
	11th to 20th	Night	5% 1 9% 45% 36% 3	594
	21st to end	Night	6% 1 11% 42% 36% 4	660
September	1st to 10th	Night	8% 2 10% 46% 32% 4	600
	11th to 20th	Night	8% 3 14% 45% 28% 2	600
	21st to end	Night	10% 4 15% 41% 28% 3	746
October	1st to 10th	Night	14% 3 18% 43% 20% 2	800
	11th to 20th	Night	11% 2 24% 41% 19% 4	800
	21st to end	Night	9% 4 23% 40% 19% 4	880
November	1st to 10th	Night	9% 2 21% 46% 19% 2	845
	11th to 20th	Night	6% 5% 26% 46% 15% 2	1050
	21st to end	Night	13% 6% 24% 36% 18% 3	1050
December	1st to 10th	Night	11% 7% 24% 45% 12% 1	1050
	11th to 20th	Night	14% 5% 27% 40% 14% 1	1050
	21st to end	Night	14% 6% 30% 41% 8% 1	1155

Page generated at 2026-03-15 00:23:55. Version ac07

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