Steamboat Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Steamboat Springs clear sky chart from 2005-11-06 to 2024-11-08.

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 11% 4 8% 5% 4 4 4 5% 7% 44%	105351
	Night	4 12% 5% 9% 4 4 4 3 5% 6% 45%	102507
Transparency	Day	38% 6% 10% 22% 18% 7%	105103
	Night	39% 5% 11% 22% 17% 6%	102345
Seeing	Day	12% 14% 29% 28% 15% 3	15596
	Night	12% 7% 24% 38% 17% 1	25653

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 14% 7% 22% 8% 3 3 2 4 5% 29%	2538
	11th to 20th	Day	2 18% 11% 17% 10% 3 4 2 4 3 25%	2764
	21st to end	Day	2 20% 10% 16% 6% 3 3 2 3 4 30%	3146
February	1st to 10th	Day	5% 23% 8% 16% 6% 3 3 2 4 5% 26%	1710
	11th to 20th	Day	4 18% 11% 15% 5% 3 3 2 4 5% 30%	1710
	21st to end	Day	2 19% 8% 17% 6% 4 4 2 4 5% 27%	1570
March	1st to 10th	Day	3 16% 11% 14% 4 4 4 3 5% 6% 31%	3285
	11th to 20th	Day	1 11% 5% 8% 4 4 3 3 4 7% 48%	3490
	21st to end	Day	4 25% 8% 13% 6% 4 4 3 4 6% 23%	3934
April	1st to 10th	Day	6% 18% 4 10% 4 4 3 3 6% 6% 37%	2280
	11th to 20th	Day	7% 17% 5% 9% 6% 5% 4 4 6% 7% 31%	2251
	21st to end	Day	5% 16% 4 7% 5% 4 4 5% 6% 8% 36%	2280
May	1st to 10th	Day	8% 19% 6% 10% 5% 5% 5% 4 6% 6% 27%	4117
	11th to 20th	Day	6% 7% 2 6% 4 5% 6% 5% 8% 9% 42%	4388
	21st to end	Day	6% 9% 3 5% 4 4 4 5% 6% 9% 46%	4825
June	1st to 10th	Day	4 5% 2 4 4 4 5% 5% 6% 9% 53%	2660
	11th to 20th	Day	5% 3 2 4 4 4 4 4 5% 7% 59%	2660
	21st to end	Day	3 3 1 4 4 4 5% 4 6% 8% 60%	2660
July	1st to 10th	Day	3 3 1 4 3 4 5% 4 6% 7% 60%	4430
	11th to 20th	Day	2 2 1 4 4 6% 7% 6% 9% 10% 49%	4430
	21st to end	Day	3 3 1 6% 4 5% 6% 5% 7% 8% 51%	4528
August	1st to 10th	Day	4 5% 2 6% 5% 5% 6% 5% 7% 9% 45%	4092
	11th to 20th	Day	7% 5% 2 6% 4 5% 5% 4 7% 8% 48%	3914
	21st to end	Day	4 4 1 4 4 4 5% 4 7% 7% 54%	4180
September	1st to 10th	Day	5% 4 1 4 4 3 4 3 5% 6% 60%	2280
	11th to 20th	Day	7% 6% 1 5% 3 3 4 3 6% 6% 56%	2280
	21st to end	Day	9% 5% 1 4 3 2 2 2 4 5% 62%	2026
October	1st to 10th	Day	5% 6% 1 3 2 2 3 2 3 4 69%	3170
	11th to 20th	Day	6% 8% 3 5% 3 3 3 3 5% 8% 52%	3150
	21st to end	Day	7% 15% 5% 5% 3 3 3 3 5% 5% 47%	3438
November	1st to 10th	Day	5% 11% 4 9% 3 3 3 3 5% 6% 48%	1753
	11th to 20th	Day	6% 17% 5% 9% 3 3 3 3 4 5% 42%	1652
	21st to end	Day	4 13% 6% 12% 3 2 2 1 4 6% 47%	1520
December	1st to 10th	Day	4 19% 7% 14% 6% 3 3 3 3 5% 32%	1520
	11th to 20th	Day	3 19% 7% 11% 5% 3 3 2 4 5% 36%	1926
	21st to end	Day	3 19% 7% 14% 7% 5% 3 3 4 6% 29%	2794
January	1st to 10th	Night	3 13% 8% 21% 8% 5% 3 2 3 4 29%	4417
	11th to 20th	Night	2 20% 10% 16% 8% 3 2 3 3 4 30%	4237
	21st to end	Night	2 21% 8% 17% 5% 3 2 2 3 4 32%	4521
February	1st to 10th	Night	4 21% 8% 16% 6% 4 3 3 4 4 27%	2470
	11th to 20th	Night	5% 18% 9% 13% 5% 4 3 3 4 5% 31%	2355
	21st to end	Night	3 19% 8% 15% 6% 3 3 3 5% 5% 31%	1884
March	1st to 10th	Night	2 17% 9% 12% 4 4 4 3 4 5% 36%	3582
	11th to 20th	Night	3 12% 4 7% 3 3 3 3 4 6% 51%	3490
	21st to end	Night	4 21% 7% 13% 5% 4 4 3 4 5% 30%	3715
April	1st to 10th	Night	7% 16% 5% 7% 4 4 3 4 5% 5% 41%	1900
	11th to 20th	Night	7% 16% 5% 8% 3 4 4 3 5% 6% 38%	1877
	21st to end	Night	8% 15% 4 7% 4 3 4 3 5% 6% 41%	1900
May	1st to 10th	Night	7% 17% 6% 6% 4 5% 4 4 6% 6% 35%	2847
	11th to 20th	Night	5% 8% 3 7% 5% 4 5% 6% 7% 8% 40%	2517
	21st to end	Night	6% 10% 2 6% 4 4 3 3 5% 7% 51%	2762
June	1st to 10th	Night	5% 4 2 4 3 3 4 4 6% 10% 55%	1520
	11th to 20th	Night	5% 5% 2 5% 3 3 3 4 5% 7% 58%	1520
	21st to end	Night	4 3 1 4 2 2 4 3 6% 6% 65%	1520
July	1st to 10th	Night	3 3 1 4 2 3 4 4 5% 7% 65%	2540
	11th to 20th	Night	1 2 1 4 4 4 6% 5% 9% 11% 52%	2540
	21st to end	Night	1 2 1 5% 4 4 5% 4 8% 8% 58%	3031
August	1st to 10th	Night	3 4 2 6% 5% 5% 6% 5% 9% 7% 49%	2847
	11th to 20th	Night	4 4 2 7% 5% 5% 6% 4 6% 8% 48%	2925
	21st to end	Night	3 3 1 5% 4 5% 5% 4 7% 9% 54%	3487
September	1st to 10th	Night	4 4 1 5% 3 3 4 3 5% 6% 63%	1900
	11th to 20th	Night	5% 5% 2 4 3 3 3 3 4 6% 61%	1900
	21st to end	Night	7% 4 1 4 3 3 3 2 3 5% 65%	2149
October	1st to 10th	Night	5% 5% 1 3 2 2 3 2 4 4 70%	3800
	11th to 20th	Night	6% 7% 2 5% 3 4 3 3 4 8% 56%	3778
	21st to end	Night	7% 11% 4 6% 3 2 3 3 3 5% 53%	4120
November	1st to 10th	Night	6% 12% 4 7% 3 2 3 2 5% 6% 49%	2465
	11th to 20th	Night	6% 16% 4 8% 3 3 3 3 4 6% 45%	2527
	21st to end	Night	4 12% 5% 9% 4 3 3 3 5% 6% 45%	2660
December	1st to 10th	Night	4 19% 6% 12% 6% 3 2 3 4 4 36%	2660
	11th to 20th	Night	4 15% 6% 12% 6% 3 3 3 5% 7% 36%	3271
	21st to end	Night	2 15% 6% 13% 7% 5% 4 3 5% 7% 33%	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	54% 7% 11% 17% 10% 1	2539
	11th to 20th	Day	61% 7% 13% 12% 6% 1	2764
	21st to end	Day	54% 7% 13% 16% 9% 1	3146
February	1st to 10th	Day	61% 5% 11% 15% 9% 1	1710
	11th to 20th	Day	56% 5% 9% 19% 8% 2	1719
	21st to end	Day	56% 6% 10% 14% 12% 2	1570
March	1st to 10th	Day	48% 6% 10% 23% 10% 3	3285
	11th to 20th	Day	35% 7% 17% 33% 7% 1	3490
	21st to end	Day	58% 9% 7% 20% 5% 1	3934
April	1st to 10th	Day	46% 5% 13% 18% 14% 4	2280
	11th to 20th	Day	49% 6% 11% 20% 13% 1	2254
	21st to end	Day	43% 7% 10% 29% 10%	2280
May	1st to 10th	Day	51% 9% 8% 16% 13% 1	4117
	11th to 20th	Day	30% 9% 12% 33% 15% 1	4392
	21st to end	Day	30% 8% 9% 30% 22% 1	4825
June	1st to 10th	Day	26% 7% 13% 26% 21% 8%	2660
	11th to 20th	Day	24% 6% 9% 18% 30% 15%	2660
	21st to end	Day	21% 6% 6% 21% 31% 16%	2660
July	1st to 10th	Day	21% 6% 5% 15% 28% 26%	4361
	11th to 20th	Day	25% 5% 7% 22% 27% 13%	4355
	21st to end	Day	27% 5% 8% 18% 22% 20%	4385
August	1st to 10th	Day	34% 6% 13% 20% 15% 13%	4078
	11th to 20th	Day	34% 5% 10% 18% 24% 9%	3953
	21st to end	Day	28% 5% 10% 20% 23% 15%	4179
September	1st to 10th	Day	23% 4 7% 18% 28% 19%	2280
	11th to 20th	Day	27% 5% 9% 22% 26% 11%	2280
	21st to end	Day	26% 4 5% 30% 30% 6%	2026
October	1st to 10th	Day	21% 3 5% 25% 36% 10%	3170
	11th to 20th	Day	31% 3 6% 36% 21% 2	3150
	21st to end	Day	39% 3 8% 36% 13% 2	3438
November	1st to 10th	Day	35% 5% 12% 25% 22% 1	1753
	11th to 20th	Day	42% 5% 15% 22% 14% 2	1652
	21st to end	Day	40% 3 12% 28% 15% 2	1520
December	1st to 10th	Day	54% 5% 17% 14% 9% 2	1520
	11th to 20th	Day	48% 5% 13% 25% 8%	1924
	21st to end	Day	52% 8% 6% 18% 14% 2	2794
January	1st to 10th	Night	57% 5% 10% 20% 8% 1	4417
	11th to 20th	Night	58% 5% 13% 13% 8% 2	4237
	21st to end	Night	58% 5% 13% 15% 8% 2	4521
February	1st to 10th	Night	60% 5% 10% 16% 8% 1	2470
	11th to 20th	Night	53% 5% 10% 21% 9% 2	2356
	21st to end	Night	53% 6% 9% 16% 13% 2	1884
March	1st to 10th	Night	45% 8% 8% 24% 14% 1	3582
	11th to 20th	Night	33% 5% 14% 34% 11% 2	3490
	21st to end	Night	52% 6% 14% 22% 6% 1	3715
April	1st to 10th	Night	42% 6% 12% 19% 17% 4	1900
	11th to 20th	Night	43% 6% 12% 22% 15% 1	1877
	21st to end	Night	41% 5% 11% 26% 17% 1	1900
May	1st to 10th	Night	40% 12% 9% 22% 15% 2	2847
	11th to 20th	Night	35% 9% 14% 28% 12% 2	2518
	21st to end	Night	28% 7% 9% 31% 24% 2	2762
June	1st to 10th	Night	22% 6% 15% 27% 21% 8%	1520
	11th to 20th	Night	25% 4 9% 19% 24% 19%	1520
	21st to end	Night	18% 5% 6% 23% 29% 20%	1520
July	1st to 10th	Night	19% 4 8% 17% 21% 30%	2500
	11th to 20th	Night	24% 4 9% 27% 21% 16%	2492
	21st to end	Night	23% 4 12% 22% 21% 18%	2936
August	1st to 10th	Night	30% 5% 17% 20% 14% 14%	2838
	11th to 20th	Night	34% 5% 12% 15% 20% 13%	2952
	21st to end	Night	25% 4 13% 18% 25% 15%	3487
September	1st to 10th	Night	21% 5% 9% 19% 26% 19%	1900
	11th to 20th	Night	25% 4 10% 22% 24% 15%	1900
	21st to end	Night	23% 5% 5% 26% 33% 8%	2149
October	1st to 10th	Night	19% 3 5% 20% 41% 11%	3800
	11th to 20th	Night	29% 2 8% 36% 22% 3	3778
	21st to end	Night	34% 2 10% 33% 19% 2	4120
November	1st to 10th	Night	34% 5% 12% 26% 21% 3	2465
	11th to 20th	Night	39% 5% 13% 26% 14% 3	2527
	21st to end	Night	40% 4 11% 28% 15% 2	2660
December	1st to 10th	Night	51% 5% 13% 18% 12% 2	2660
	11th to 20th	Night	47% 4 12% 25% 12%	3272
	21st to end	Night	49% 7% 10% 16% 16% 1	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	19% 15% 24% 27% 13% 2	270
	11th to 20th	Day	19% 14% 32% 26% 8% 1	270
	21st to end	Day	12% 17% 37% 25% 6% 3	297
February	1st to 10th	Day	23% 18% 34% 20% 4	270
	11th to 20th	Day	16% 22% 30% 26% 6%	270
	21st to end	Day	16% 26% 35% 20% 2	225
March	1st to 10th	Day	19% 24% 27% 21% 9% 1	360
	11th to 20th	Day	15% 21% 32% 25% 6% 2	460
	21st to end	Day	19% 28% 32% 17% 4	506
April	1st to 10th	Day	20% 26% 29% 18% 7%	460
	11th to 20th	Day	23% 26% 28% 17% 4 1	452
	21st to end	Day	15% 24% 31% 20% 7% 2	460
May	1st to 10th	Day	20% 21% 30% 19% 9% 1	489
	11th to 20th	Day	14% 11% 26% 30% 17% 2	675
	21st to end	Day	12% 13% 29% 27% 16% 3	734
June	1st to 10th	Day	5% 10% 27% 31% 21% 5%	680
	11th to 20th	Day	8% 14% 32% 29% 15% 2	680
	21st to end	Day	5% 8% 30% 32% 22% 3	680
July	1st to 10th	Day	5% 6% 21% 35% 30% 3	671
	11th to 20th	Day	3 5% 22% 37% 27% 6%	668
	21st to end	Day	4 5% 22% 38% 25% 6%	579
August	1st to 10th	Day	5% 5% 33% 33% 18% 5%	487
	11th to 20th	Day	4 5% 32% 33% 21% 5%	477
	21st to end	Day	5% 6% 29% 35% 19% 6%	539
September	1st to 10th	Day	7% 10% 28% 31% 18% 6%	490
	11th to 20th	Day	6% 11% 33% 28% 18% 4	490
	21st to end	Day	11% 11% 27% 25% 19% 8%	359
October	1st to 10th	Day	14% 9% 22% 29% 18% 8%	300
	11th to 20th	Day	11% 16% 27% 28% 14% 3	300
	21st to end	Day	20% 15% 32% 25% 7% 2	330
November	1st to 10th	Day	18% 21% 26% 23% 10% 3	291
	11th to 20th	Day	16% 14% 30% 30% 9% 1	270
	21st to end	Day	14% 11% 35% 31% 9% 1	270
December	1st to 10th	Day	17% 15% 34% 23% 9% 1	270
	11th to 20th	Day	17% 11% 36% 27% 7% 1	270
	21st to end	Day	20% 15% 33% 25% 7% 1	297
January	1st to 10th	Night	16% 12% 24% 36% 11% 1	950
	11th to 20th	Night	17% 12% 30% 31% 8% 1	835
	21st to end	Night	15% 9% 31% 34% 10% 1	836
February	1st to 10th	Night	17% 10% 35% 32% 7%	760
	11th to 20th	Night	14% 10% 32% 36% 7%	744
	21st to end	Night	14% 13% 35% 35% 3	628
March	1st to 10th	Night	13% 11% 31% 35% 9% 1	760
	11th to 20th	Night	10% 7% 23% 47% 13%	760
	21st to end	Night	14% 9% 31% 36% 10% 1	774
April	1st to 10th	Night	16% 11% 28% 38% 7%	570
	11th to 20th	Night	14% 10% 30% 35% 10% 1	563
	21st to end	Night	14% 10% 24% 37% 15% 1	570
May	1st to 10th	Night	14% 6% 29% 38% 12% 1	570
	11th to 20th	Night	11% 4 19% 41% 24% 1	561
	21st to end	Night	10% 6% 22% 39% 21% 2	617
June	1st to 10th	Night	6% 4 17% 44% 28% 1	570
	11th to 20th	Night	6% 5% 23% 46% 19% 1	570
	21st to end	Night	4 2 16% 49% 27% 1	570
July	1st to 10th	Night	3 1 13% 42% 39% 3	555
	11th to 20th	Night	2 2 9% 47% 37% 3	552
	21st to end	Night	2 1 9% 43% 43% 3	624
August	1st to 10th	Night	5% 1 9% 41% 43% 1	567
	11th to 20th	Night	3 2 11% 46% 36% 2	564
	21st to end	Night	5% 10% 42% 38% 4	627
September	1st to 10th	Night	5% 2 12% 47% 30% 4	570
	11th to 20th	Night	6% 3 14% 44% 30% 3	570
	21st to end	Night	8% 3 18% 38% 28% 6%	690
October	1st to 10th	Night	11% 5% 20% 41% 20% 4	760
	11th to 20th	Night	11% 6% 23% 41% 18% 1	760
	21st to end	Night	15% 6% 27% 37% 14% 2	836
November	1st to 10th	Night	14% 8% 30% 34% 14% 1	925
	11th to 20th	Night	16% 10% 27% 37% 9% 1	950
	21st to end	Night	11% 9% 26% 41% 12% 1	950
December	1st to 10th	Night	19% 10% 30% 32% 8% 1	950
	11th to 20th	Night	15% 11% 30% 36% 7%	950
	21st to end	Night	18% 12% 32% 30% 7% 1	1045

Page generated at 2024-11-05 06:15:52. Version ac07

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