Rio Grande Village Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rio Grande Village Campground clear sky chart from 2005-11-06 to 2026-06-16.

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	2 2 1 3 3 3 4 3 6% 8% 65%	145700
	Night	2 2 1 3 2 3 3 3 5% 8% 66%	143784
Transparency	Day	13% 21% 8% 17% 22% 19%	140814
	Night	13% 21% 7% 17% 21% 20%	139677
Seeing	Day	4 5% 20% 34% 27% 9%	16585
	Night	4 3 20% 48% 23% 1	26718

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 2 1 3 2 2 3 3 4 6% 72%	5885
	11th to 20th	Day	2 3 1 3 3 2 2 2 5% 6% 70%	5910
	21st to end	Day	3 5% 2 5% 3 3 4 3 5% 7% 60%	6468
February	1st to 10th	Day	3 3 1 4 4 3 3 3 4 6% 66%	2100
	11th to 20th	Day	4 4 1 4 3 2 4 3 4 7% 64%	2049
	21st to end	Day	3 3 2 3 2 3 3 5% 7% 70%	1730
March	1st to 10th	Day	3 3 1 3 3 3 3 3 5% 6% 67%	4600
	11th to 20th	Day	3 3 1 3 2 2 3 3 4 6% 70%	4762
	21st to end	Day	2 4 1 3 2 3 3 3 5% 7% 66%	6101
April	1st to 10th	Day	2 3 1 3 2 2 3 3 5% 8% 68%	2520
	11th to 20th	Day	2 2 1 2 2 3 3 2 4 7% 70%	2491
	21st to end	Day	1 3 1 3 2 3 3 3 5% 5% 70%	2520
May	1st to 10th	Day	2 2 1 2 2 2 3 2 4 6% 75%	7057
	11th to 20th	Day	2 2 1 3 2 3 3 3 6% 8% 67%	7050
	21st to end	Day	2 2 1 2 2 3 4 4 6% 8% 66%	8404
June	1st to 10th	Day	1 1 2 2 3 3 4 7% 9% 67%	2730
	11th to 20th	Day	2 2 1 2 3 3 4 4 6% 9% 63%	2666
	21st to end	Day	2 2 1 3 3 3 5% 5% 9% 11% 56%	2600
July	1st to 10th	Day	2 2 1 4 3 4 4 4 8% 11% 56%	5534
	11th to 20th	Day	1 2 1 3 3 4 5% 5% 11% 15% 50%	5440
	21st to end	Day	1 2 1 4 2 4 4 4 8% 11% 60%	5922
August	1st to 10th	Day	1 1 1 2 2 4 5% 8% 13% 63%	5348
	11th to 20th	Day	1 1 1 3 3 4 4 5% 8% 14% 57%	5366
	21st to end	Day	1 1 1 2 3 3 5% 5% 9% 14% 55%	5984
September	1st to 10th	Day	3 4 1 5% 6% 6% 7% 5% 8% 9% 45%	2400
	11th to 20th	Day	4 3 2 6% 4 5% 5% 4 7% 9% 51%	2210
	21st to end	Day	3 3 2 4 3 3 4 4 5% 8% 62%	2200
October	1st to 10th	Day	1 1 1 2 2 2 2 2 4 5% 78%	3590
	11th to 20th	Day	3 2 1 3 2 2 3 2 4 5% 73%	3568
	21st to end	Day	2 2 2 1 1 1 1 2 3 83%	3565
November	1st to 10th	Day	3 3 1 3 3 1 3 2 5% 6% 70%	1938
	11th to 20th	Day	3 3 1 3 2 3 2 3 4 6% 69%	1890
	21st to end	Day	5% 3 1 4 3 3 2 3 5% 6% 65%	1890
December	1st to 10th	Day	2 4 2 6% 3 3 3 3 7% 8% 58%	3030
	11th to 20th	Day	1 2 1 4 3 4 4 4 6% 7% 65%	3481
	21st to end	Day	2 2 1 3 2 2 3 2 4 6% 72%	4701
January	1st to 10th	Night	3 2 1 2 2 2 2 2 3 6% 77%	7038
	11th to 20th	Night	3 2 1 3 2 2 3 3 5% 5% 72%	7080
	21st to end	Night	4 4 1 5% 4 3 4 3 5% 7% 60%	7746
February	1st to 10th	Night	4 3 1 3 3 3 3 3 6% 6% 66%	2520
	11th to 20th	Night	4 3 2 4 3 3 3 3 6% 7% 62%	2458
	21st to end	Night	2 3 1 4 3 3 4 4 4 7% 66%	2076
March	1st to 10th	Night	4 3 1 3 2 3 4 3 5% 7% 64%	5494
	11th to 20th	Night	3 2 1 3 2 2 3 3 4 7% 70%	5414
	21st to end	Night	2 3 1 3 3 3 3 3 5% 6% 68%	5094
April	1st to 10th	Night	3 4 1 4 4 3 3 2 5% 6% 65%	2100
	11th to 20th	Night	3 2 1 3 3 3 4 3 5% 8% 66%	2077
	21st to end	Night	2 2 1 2 2 3 3 3 4 6% 72%	2100
May	1st to 10th	Night	2 2 1 2 2 2 2 2 4 5% 75%	5890
	11th to 20th	Night	3 2 1 3 3 3 4 3 6% 8% 64%	5824
	21st to end	Night	2 2 1 5% 3 4 5% 4 7% 8% 59%	5803
June	1st to 10th	Night	2 1 3 3 3 4 5% 8% 11% 60%	1890
	11th to 20th	Night	1 1 1 3 3 4 6% 5% 7% 10% 59%	1845
	21st to end	Night	2 2 1 2 2 3 4 6% 8% 11% 59%	1800
July	1st to 10th	Night	2 2 2 4 3 3 4 5% 8% 13% 54%	4437
	11th to 20th	Night	1 2 1 3 3 3 4 4 7% 12% 61%	4540
	21st to end	Night	1 1 1 3 3 3 4 5% 7% 12% 60%	4951
August	1st to 10th	Night	1 1 1 2 2 3 6% 12% 72%	4464
	11th to 20th	Night	1 1 1 2 2 3 4 4 8% 12% 62%	4483
	21st to end	Night	1 1 1 2 2 3 3 3 7% 13% 64%	4993
September	1st to 10th	Night	3 3 1 4 5% 4 5% 5% 7% 9% 54%	2000
	11th to 20th	Night	3 3 2 5% 3 4 6% 6% 8% 10% 51%	2190
	21st to end	Night	3 3 1 4 3 3 4 4 7% 10% 57%	2200
October	1st to 10th	Night	1 1 1 2 1 2 3 3 5% 6% 76%	3590
	11th to 20th	Night	2 2 3 1 2 3 2 4 6% 76%	3570
	21st to end	Night	2 2 1 2 1 1 2 2 2 3 83%	4217
November	1st to 10th	Night	4 2 1 2 1 1 2 2 3 5% 77%	2555
	11th to 20th	Night	3 2 1 3 2 2 3 3 5% 7% 71%	2730
	21st to end	Night	4 2 1 4 3 2 4 3 5% 6% 66%	2730
December	1st to 10th	Night	3 3 2 5% 5% 5% 5% 4 7% 8% 53%	4380
	11th to 20th	Night	2 3 1 3 2 2 2 2 4 6% 73%	4946
	21st to end	Night	2 2 1 3 2 2 3 2 4 7% 71%	6559

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	11% 14% 4 22% 30% 20%	5888
	11th to 20th	Day	14% 13% 5% 17% 30% 21%	5910
	21st to end	Day	21% 14% 5% 21% 25% 13%	6468
February	1st to 10th	Day	12% 31% 5% 11% 18% 23%	2100
	11th to 20th	Day	15% 32% 5% 10% 20% 17%	2059
	21st to end	Day	10% 31% 5% 10% 23% 22%	1730
March	1st to 10th	Day	15% 15% 4 9% 18% 39%	4600
	11th to 20th	Day	12% 17% 5% 7% 16% 43%	4762
	21st to end	Day	14% 16% 4 11% 22% 33%	6101
April	1st to 10th	Day	10% 31% 6% 10% 17% 26%	2520
	11th to 20th	Day	10% 30% 5% 10% 18% 26%	2494
	21st to end	Day	12% 31% 6% 11% 16% 25%	2520
May	1st to 10th	Day	11% 12% 5% 16% 20% 36%	7057
	11th to 20th	Day	14% 13% 6% 11% 26% 28%	7053
	21st to end	Day	15% 13% 7% 21% 20% 23%	8405
June	1st to 10th	Day	8% 32% 8% 18% 20% 14%	2730
	11th to 20th	Day	10% 33% 7% 12% 22% 16%	2666
	21st to end	Day	14% 36% 11% 17% 15% 7%	2600
July	1st to 10th	Day	18% 18% 16% 25% 20% 3	5476
	11th to 20th	Day	18% 16% 16% 34% 11% 3	5377
	21st to end	Day	16% 17% 16% 22% 20% 8%	5752
August	1st to 10th	Day	11% 22% 7% 26% 30% 5%	3892
	11th to 20th	Day	15% 22% 10% 36% 15% 2	3882
	21st to end	Day	17% 23% 15% 23% 19% 3	4311
September	1st to 10th	Day	22% 37% 12% 11% 9% 9%	2400
	11th to 20th	Day	19% 35% 10% 14% 16% 6%	2210
	21st to end	Day	10% 33% 6% 17% 18% 15%	2200
October	1st to 10th	Day	7% 20% 6% 10% 25% 33%	3590
	11th to 20th	Day	8% 21% 8% 19% 14% 30%	3568
	21st to end	Day	5% 20% 2 10% 34% 28%	3565
November	1st to 10th	Day	4 36% 4 13% 23% 21%	1938
	11th to 20th	Day	8% 37% 5% 12% 22% 17%	1890
	21st to end	Day	13% 36% 6% 16% 14% 15%	1890
December	1st to 10th	Day	17% 23% 12% 16% 23% 9%	3030
	11th to 20th	Day	13% 22% 6% 25% 24% 10%	3479
	21st to end	Day	9% 18% 5% 14% 32% 21%	4701
January	1st to 10th	Night	9% 13% 3 22% 35% 19%	7038
	11th to 20th	Night	13% 13% 4 12% 29% 29%	7080
	21st to end	Night	23% 13% 7% 18% 23% 15%	7746
February	1st to 10th	Night	14% 31% 4 9% 17% 25%	2520
	11th to 20th	Night	15% 32% 5% 8% 19% 20%	2458
	21st to end	Night	11% 32% 3 8% 21% 24%	2076
March	1st to 10th	Night	16% 16% 3 9% 18% 37%	5494
	11th to 20th	Night	11% 18% 8% 7% 13% 44%	5414
	21st to end	Night	14% 16% 6% 12% 18% 35%	5094
April	1st to 10th	Night	15% 31% 5% 11% 14% 24%	2100
	11th to 20th	Night	12% 30% 6% 13% 14% 25%	2077
	21st to end	Night	10% 31% 7% 14% 17% 22%	2100
May	1st to 10th	Night	12% 12% 7% 19% 20% 30%	5888
	11th to 20th	Night	17% 14% 8% 14% 23% 24%	5825
	21st to end	Night	20% 13% 9% 23% 17% 18%	5805
June	1st to 10th	Night	10% 33% 10% 21% 17% 10%	1890
	11th to 20th	Night	11% 33% 8% 12% 21% 14%	1845
	21st to end	Night	13% 36% 9% 15% 18% 9%	1800
July	1st to 10th	Night	17% 18% 15% 27% 20% 2	4387
	11th to 20th	Night	15% 16% 15% 35% 16% 4	4480
	21st to end	Night	15% 17% 18% 23% 19% 8%	4808
August	1st to 10th	Night	7% 21% 5% 28% 35% 5%	3244
	11th to 20th	Night	10% 21% 10% 39% 18% 2	3243
	21st to end	Night	13% 23% 13% 23% 24% 3	3597
September	1st to 10th	Night	17% 36% 12% 16% 10% 8%	2000
	11th to 20th	Night	18% 36% 11% 15% 14% 5%	2190
	21st to end	Night	12% 34% 9% 16% 15% 14%	2200
October	1st to 10th	Night	6% 22% 5% 10% 20% 37%	3590
	11th to 20th	Night	9% 20% 7% 20% 12% 33%	3570
	21st to end	Night	6% 21% 2 14% 32% 25%	4217
November	1st to 10th	Night	4 35% 2 10% 24% 24%	2555
	11th to 20th	Night	7% 36% 5% 11% 21% 21%	2730
	21st to end	Night	11% 36% 7% 13% 15% 17%	2730
December	1st to 10th	Night	23% 23% 9% 15% 14% 16%	4380
	11th to 20th	Night	11% 20% 5% 21% 28% 15%	4947
	21st to end	Night	11% 18% 4 15% 31% 21%	6559

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	8% 5% 27% 38% 20% 3	330
	11th to 20th	Day	4 5% 27% 42% 20% 2	330
	21st to end	Day	6% 8% 32% 38% 15% 2	363
February	1st to 10th	Day	7% 9% 21% 33% 23% 7%	330
	11th to 20th	Day	12% 7% 30% 34% 15% 2	330
	21st to end	Day	5% 10% 33% 32% 16% 4	273
March	1st to 10th	Day	9% 8% 32% 32% 15% 2	330
	11th to 20th	Day	7% 10% 30% 30% 18% 5%	336
	21st to end	Day	7% 14% 29% 34% 14% 3	594
April	1st to 10th	Day	6% 16% 33% 32% 13% 1	540
	11th to 20th	Day	4 15% 36% 32% 11% 1	532
	21st to end	Day	4 13% 36% 39% 9% 1	540
May	1st to 10th	Day	3 10% 41% 32% 14% 1	543
	11th to 20th	Day	3 7% 37% 37% 14% 1	573
	21st to end	Day	3 4 24% 45% 23% 1	844
June	1st to 10th	Day	2 1 19% 38% 36% 5%	780
	11th to 20th	Day	2 1 12% 37% 41% 7%	756
	21st to end	Day	2 1 8% 34% 44% 11%	730
July	1st to 10th	Day	3 2 8% 27% 40% 20%	569
	11th to 20th	Day	1 4 33% 42% 20%	524
	21st to end	Day	1 1 6% 38% 37% 17%	575
August	1st to 10th	Day	1 1 4 31% 42% 21%	527
	11th to 20th	Day	4 1 7% 29% 38% 21%	517
	21st to end	Day	2 1 7% 34% 34% 22%	583
September	1st to 10th	Day	4 2 12% 37% 32% 14%	530
	11th to 20th	Day	3 1 3 20% 43% 31%	340
	21st to end	Day	4 2 9% 25% 36% 23%	330
October	1st to 10th	Day	2 1 12% 28% 39% 17%	330
	11th to 20th	Day	8% 4 11% 31% 32% 15%	330
	21st to end	Day	6% 7% 15% 31% 30% 11%	363
November	1st to 10th	Day	5% 3 18% 35% 27% 12%	330
	11th to 20th	Day	5% 7% 22% 26% 30% 11%	330
	21st to end	Day	8% 6% 25% 37% 20% 4	330
December	1st to 10th	Day	6% 6% 20% 40% 24% 5%	330
	11th to 20th	Day	3 8% 23% 32% 25% 7%	330
	21st to end	Day	3 7% 20% 41% 22% 7%	363
January	1st to 10th	Night	6% 2 21% 53% 17% 1	840
	11th to 20th	Night	6% 3 19% 54% 18%	840
	21st to end	Night	6% 3 26% 51% 14%	924
February	1st to 10th	Night	6% 3 24% 47% 19% 1	840
	11th to 20th	Night	6% 5% 29% 50% 10%	824
	21st to end	Night	3 4 29% 55% 8%	692
March	1st to 10th	Night	6% 5% 33% 44% 13% 1	840
	11th to 20th	Night	6% 5% 32% 43% 14%	796
	21st to end	Night	5% 5% 36% 44% 11%	693
April	1st to 10th	Night	5% 4 37% 45% 9%	630
	11th to 20th	Night	4 7% 40% 42% 8%	623
	21st to end	Night	2 6% 41% 44% 7%	630
May	1st to 10th	Night	3 4 37% 49% 7%	630
	11th to 20th	Night	5% 4 33% 50% 8%	621
	21st to end	Night	3 3 30% 52% 12%	683
June	1st to 10th	Night	1 2 20% 57% 19%	630
	11th to 20th	Night	1 1 19% 57% 21% 1	615
	21st to end	Night	3 1 11% 53% 32% 1	600
July	1st to 10th	Night	5% 1 10% 42% 40% 2	585
	11th to 20th	Night	2 1 8% 52% 37% 1	582
	21st to end	Night	2 8% 49% 38% 3	657
August	1st to 10th	Night	1 4 48% 43% 4	597
	11th to 20th	Night	3 1 5% 40% 48% 3	594
	21st to end	Night	1 1 5% 42% 45% 5%	660
September	1st to 10th	Night	4 1 3 41% 48% 3	600
	11th to 20th	Night	5% 1 6% 43% 42% 4	600
	21st to end	Night	3 1 8% 44% 43% 3	600
October	1st to 10th	Night	3 1 12% 43% 39% 2	600
	11th to 20th	Night	5% 2 13% 50% 28% 3	600
	21st to end	Night	4 4 14% 42% 31% 5%	857
November	1st to 10th	Night	4 1 13% 46% 31% 4	915
	11th to 20th	Night	4 3 15% 47% 29% 2	1050
	21st to end	Night	5% 3 22% 48% 21% 2	1050
December	1st to 10th	Night	6% 2 17% 51% 23% 1	1050
	11th to 20th	Night	5% 3 21% 50% 21% 1	1050
	21st to end	Night	4 3 22% 51% 18% 2	1120

Page generated at 2026-06-13 01:31:40. Version ac07

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