Enchanted Forest Ski Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Enchanted Forest Ski Area clear sky chart from 2005-11-06 to 2026-07-31.

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 5% 2 6% 4 4 5% 4 6% 8% 54%	146538
	Night	2 3 2 5% 3 4 4 4 6% 8% 59%	143978
Transparency	Day	27% 4 9% 21% 27% 12%	141546
	Night	22% 5% 10% 23% 28% 11%	139979
Seeing	Day	17% 28% 24% 19% 10% 2	17679
	Night	10% 22% 27% 25% 14% 2	27688

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 3 10% 3 3 3 2 4 7% 61%	4798
	11th to 20th	Day	2 1 5% 4 4 3 2 4 6% 68%	5340
	21st to end	Day	5% 4 6% 3 4 4 3 5% 7% 58%	5844
February	1st to 10th	Day	3 2 7% 4 4 4 3 5% 8% 59%	1941
	11th to 20th	Day	3 2 7% 4 3 4 4 5% 8% 59%	2049
	21st to end	Day	4 3 7% 5% 5% 4 3 5% 7% 57%	1730
March	1st to 10th	Day	5% 3 6% 3 3 3 3 5% 7% 61%	4647
	11th to 20th	Day	1 8% 4 10% 5% 5% 5% 4 7% 7% 44%	5110
	21st to end	Day	1 4 3 5% 4 4 4 5% 7% 9% 54%	5906
April	1st to 10th	Day	1 5% 2 6% 4 4 4 4 6% 7% 56%	2520
	11th to 20th	Day	3 7% 2 5% 4 4 4 3 5% 7% 56%	2491
	21st to end	Day	3 9% 2 5% 4 4 4 4 6% 8% 51%	2520
May	1st to 10th	Day	3 12% 3 6% 4 4 4 4 6% 8% 46%	7057
	11th to 20th	Day	3 5% 2 5% 3 3 4 3 5% 6% 61%	7735
	21st to end	Day	2 3 1 4 3 4 5% 4 6% 8% 59%	9026
June	1st to 10th	Day	2 3 2 5% 4 5% 5% 5% 8% 9% 53%	2940
	11th to 20th	Day	2 2 1 4 3 4 4 4 6% 7% 62%	2940
	21st to end	Day	5% 3 2 6% 5% 6% 6% 4 7% 7% 49%	2940
July	1st to 10th	Day	2 3 2 4 4 5% 6% 6% 7% 8% 53%	6479
	11th to 20th	Day	2 3 2 7% 6% 7% 9% 8% 10% 10% 36%	6354
	21st to end	Day	5% 6% 3 10% 7% 8% 8% 6% 9% 9% 31%	6532
August	1st to 10th	Day	4 5% 2 7% 6% 6% 8% 6% 8% 11% 38%	5591
	11th to 20th	Day	3 5% 2 7% 6% 5% 6% 5% 7% 10% 43%	5366
	21st to end	Day	4 5% 2 7% 6% 6% 7% 5% 8% 11% 36%	5984
September	1st to 10th	Day	8% 7% 3 8% 5% 5% 5% 4 6% 7% 44%	2400
	11th to 20th	Day	6% 5% 2 5% 5% 4 4 4 6% 7% 53%	2385
	21st to end	Day	4 4 2 5% 3 4 4 4 5% 7% 59%	2200
October	1st to 10th	Day	4 4 2 4 3 3 3 3 4 7% 65%	3288
	11th to 20th	Day	3 3 2 4 4 4 4 4 5% 6% 60%	3250
	21st to end	Day	2 3 1 4 2 2 2 3 3 5% 73%	3548
November	1st to 10th	Day	1 3 1 4 2 2 3 3 4 8% 69%	1883
	11th to 20th	Day	3 1 3 2 3 3 3 5% 8% 67%	1890
	21st to end	Day	1 5% 2 5% 3 5% 4 3 5% 7% 61%	1890
December	1st to 10th	Day	2 1 3 1 2 2 2 4 7% 75%	2766
	11th to 20th	Day	3 1 3 2 3 4 4 6% 9% 64%	3106
	21st to end	Day	3 1 5% 3 3 3 3 6% 8% 67%	4092
January	1st to 10th	Night	2 2 8% 5% 4 4 3 6% 8% 58%	8166
	11th to 20th	Night	1 1 4 2 3 3 3 7% 7% 69%	7650
	21st to end	Night	2 1 5% 3 4 4 4 6% 8% 63%	8370
February	1st to 10th	Night	3 2 5% 4 2 3 3 6% 10% 62%	2677
	11th to 20th	Night	4 2 7% 4 4 5% 3 5% 9% 58%	2458
	21st to end	Night	4 2 6% 4 4 3 4 5% 7% 61%	2076
March	1st to 10th	Night	4 2 6% 3 3 3 3 6% 7% 63%	5433
	11th to 20th	Night	1 7% 3 6% 3 3 4 4 5% 7% 56%	5110
	21st to end	Night	1 3 2 4 2 3 4 3 6% 8% 64%	5296
April	1st to 10th	Night	1 4 2 4 3 3 3 4 6% 9% 62%	2100
	11th to 20th	Night	2 7% 2 4 3 3 4 3 5% 8% 60%	2077
	21st to end	Night	2 5% 1 4 4 3 4 4 6% 8% 59%	2100
May	1st to 10th	Night	4 8% 2 4 3 3 3 3 6% 8% 55%	5890
	11th to 20th	Night	2 5% 2 3 3 3 4 3 5% 7% 62%	5141
	21st to end	Night	2 3 2 5% 4 4 5% 4 6% 7% 59%	5181
June	1st to 10th	Night	2 3 2 4 4 5% 6% 5% 7% 10% 54%	1680
	11th to 20th	Night	1 2 1 3 3 3 3 4 6% 7% 67%	1680
	21st to end	Night	4 5% 1 4 5% 4 5% 4 9% 9% 50%	1680
July	1st to 10th	Night	2 5% 2 6% 5% 5% 5% 6% 7% 8% 49%	3720
	11th to 20th	Night	1 3 1 4 4 5% 7% 6% 10% 13% 45%	3828
	21st to end	Night	4 4 2 5% 4 5% 7% 7% 11% 12% 39%	4562
August	1st to 10th	Night	3 4 2 5% 5% 5% 8% 5% 10% 11% 42%	4217
	11th to 20th	Night	3 3 1 4 4 5% 6% 6% 10% 15% 44%	4483
	21st to end	Night	4 5% 2 6% 5% 6% 7% 7% 11% 12% 35%	4993
September	1st to 10th	Night	5% 4 2 5% 5% 4 5% 4 7% 9% 52%	2000
	11th to 20th	Night	4 3 1 4 3 4 4 4 6% 7% 62%	2015
	21st to end	Night	4 4 1 3 3 4 3 2 5% 6% 64%	2200
October	1st to 10th	Night	2 3 1 2 2 3 3 2 4 6% 72%	3885
	11th to 20th	Night	3 4 2 4 3 3 3 3 4 6% 65%	3898
	21st to end	Night	2 2 1 3 1 2 2 2 3 6% 76%	4252
November	1st to 10th	Night	1 3 1 2 1 2 2 2 5% 7% 73%	2611
	11th to 20th	Night	2 1 2 2 2 3 2 5% 8% 73%	2730
	21st to end	Night	1 4 2 4 3 4 4 4 6% 8% 61%	2730
December	1st to 10th	Night	2 1 4 2 3 3 3 4 6% 73%	4640
	11th to 20th	Night	2 1 4 3 3 3 3 5% 7% 69%	5321
	21st to end	Night	2 1 5% 4 4 4 4 7% 7% 61%	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	26% 4 5% 26% 32% 8%	4801
	11th to 20th	Day	20% 5% 8% 21% 26% 20%	5340
	21st to end	Day	26% 3 4 17% 32% 18%	5844
February	1st to 10th	Day	26% 6% 10% 22% 25% 11%	1941
	11th to 20th	Day	26% 4 8% 25% 26% 10%	2059
	21st to end	Day	29% 5% 5% 15% 30% 16%	1730
March	1st to 10th	Day	22% 4 4 15% 35% 20%	4647
	11th to 20th	Day	37% 5% 4 18% 28% 8%	5110
	21st to end	Day	24% 5% 6% 39% 22% 4	5906
April	1st to 10th	Day	26% 4 8% 26% 26% 10%	2520
	11th to 20th	Day	28% 4 6% 23% 28% 11%	2494
	21st to end	Day	29% 4 8% 23% 28% 7%	2520
May	1st to 10th	Day	34% 2 8% 22% 25% 8%	7057
	11th to 20th	Day	23% 3 6% 17% 38% 13%	7739
	21st to end	Day	21% 3 7% 20% 33% 16%	9027
June	1st to 10th	Day	25% 6% 12% 22% 22% 13%	2940
	11th to 20th	Day	20% 5% 6% 18% 27% 24%	2940
	21st to end	Day	30% 6% 9% 20% 21% 14%	2940
July	1st to 10th	Day	27% 4 10% 14% 21% 24%	6411
	11th to 20th	Day	37% 5% 22% 25% 7% 4	6279
	21st to end	Day	45% 7% 17% 19% 9% 3	6348
August	1st to 10th	Day	44% 9% 19% 17% 7% 4	4064
	11th to 20th	Day	31% 5% 18% 21% 15% 9%	3882
	21st to end	Day	38% 6% 20% 21% 13% 2	4311
September	1st to 10th	Day	38% 6% 10% 20% 19% 6%	2400
	11th to 20th	Day	30% 5% 8% 18% 27% 12%	2385
	21st to end	Day	25% 4 6% 24% 33% 8%	2200
October	1st to 10th	Day	22% 3 4 17% 36% 18%	3288
	11th to 20th	Day	24% 2 6% 25% 34% 8%	3250
	21st to end	Day	16% 1 3 18% 43% 18%	3548
November	1st to 10th	Day	16% 3 8% 25% 36% 13%	1883
	11th to 20th	Day	17% 4 7% 29% 35% 9%	1890
	21st to end	Day	24% 4 7% 21% 31% 13%	1890
December	1st to 10th	Day	13% 3 9% 24% 40% 11%	2766
	11th to 20th	Day	19% 4 7% 22% 38% 11%	3104
	21st to end	Day	17% 5% 6% 26% 34% 12%	4092
January	1st to 10th	Night	24% 5% 5% 25% 31% 9%	8167
	11th to 20th	Night	17% 7% 6% 20% 31% 19%	7650
	21st to end	Night	20% 5% 5% 19% 35% 16%	8370
February	1st to 10th	Night	22% 6% 11% 24% 27% 11%	2677
	11th to 20th	Night	27% 5% 9% 29% 24% 7%	2458
	21st to end	Night	25% 4 6% 19% 33% 13%	2076
March	1st to 10th	Night	22% 5% 4 13% 36% 20%	5433
	11th to 20th	Night	27% 5% 5% 20% 33% 10%	5110
	21st to end	Night	18% 7% 7% 42% 23% 4	5296
April	1st to 10th	Night	20% 4 9% 31% 26% 10%	2100
	11th to 20th	Night	23% 4 9% 23% 31% 10%	2077
	21st to end	Night	22% 6% 12% 28% 26% 6%	2100
May	1st to 10th	Night	26% 4 7% 33% 24% 6%	5888
	11th to 20th	Night	21% 5% 8% 24% 29% 13%	5142
	21st to end	Night	23% 4 10% 18% 29% 16%	5182
June	1st to 10th	Night	22% 6% 16% 21% 21% 13%	1680
	11th to 20th	Night	17% 3 8% 20% 27% 24%	1680
	21st to end	Night	28% 8% 12% 18% 20% 14%	1680
July	1st to 10th	Night	30% 7% 12% 14% 16% 21%	3680
	11th to 20th	Night	25% 8% 30% 25% 7% 5%	3780
	21st to end	Night	33% 9% 25% 21% 11% 1	4434
August	1st to 10th	Night	37% 12% 23% 16% 7% 5%	3068
	11th to 20th	Night	25% 10% 24% 20% 14% 7%	3243
	21st to end	Night	35% 8% 25% 20% 11% 2	3597
September	1st to 10th	Night	29% 6% 13% 27% 18% 6%	2000
	11th to 20th	Night	21% 5% 12% 22% 27% 13%	2015
	21st to end	Night	22% 5% 8% 27% 31% 7%	2200
October	1st to 10th	Night	16% 4 6% 24% 36% 14%	3885
	11th to 20th	Night	19% 2 9% 26% 35% 9%	3898
	21st to end	Night	13% 2 4 21% 42% 18%	4252
November	1st to 10th	Night	13% 3 8% 27% 37% 11%	2611
	11th to 20th	Night	12% 5% 6% 32% 33% 12%	2730
	21st to end	Night	23% 4 7% 24% 28% 14%	2730
December	1st to 10th	Night	15% 3 7% 25% 39% 10%	4640
	11th to 20th	Night	17% 5% 6% 22% 34% 16%	5322
	21st to end	Night	21% 6% 9% 22% 32% 10%	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	25% 34% 21% 13% 6% 1	330
	11th to 20th	Day	23% 37% 23% 15% 2 1	330
	21st to end	Day	14% 40% 25% 15% 6% 1	363
February	1st to 10th	Day	22% 46% 18% 9% 4 1	330
	11th to 20th	Day	30% 42% 15% 10% 2 1	330
	21st to end	Day	33% 38% 20% 8%	273
March	1st to 10th	Day	29% 37% 19% 10% 4 1	351
	11th to 20th	Day	24% 40% 24% 9% 3 1	540
	21st to end	Day	29% 43% 22% 5% 1	594
April	1st to 10th	Day	22% 43% 24% 8% 2 1	540
	11th to 20th	Day	32% 44% 17% 6% 2	532
	21st to end	Day	30% 39% 23% 6% 2	540
May	1st to 10th	Day	21% 42% 25% 9% 3	543
	11th to 20th	Day	18% 28% 25% 19% 7% 2	754
	21st to end	Day	15% 28% 26% 23% 7% 1	844
June	1st to 10th	Day	6% 24% 29% 25% 14% 2	780
	11th to 20th	Day	9% 26% 29% 22% 12% 3	780
	21st to end	Day	12% 22% 25% 23% 15% 4	780
July	1st to 10th	Day	7% 14% 23% 31% 20% 6%	771
	11th to 20th	Day	6% 6% 18% 34% 29% 7%	720
	21st to end	Day	8% 8% 19% 32% 26% 6%	616
August	1st to 10th	Day	12% 14% 26% 26% 18% 4	527
	11th to 20th	Day	8% 12% 27% 33% 15% 5%	517
	21st to end	Day	8% 12% 27% 33% 16% 4	583
September	1st to 10th	Day	11% 14% 26% 29% 17% 4	530
	11th to 20th	Day	10% 25% 31% 22% 10% 2	515
	21st to end	Day	12% 19% 30% 23% 12% 4	330
October	1st to 10th	Day	14% 27% 26% 18% 10% 4	330
	11th to 20th	Day	17% 38% 24% 11% 5% 4	330
	21st to end	Day	22% 33% 24% 12% 6% 3	363
November	1st to 10th	Day	19% 38% 25% 12% 4 2	330
	11th to 20th	Day	18% 33% 25% 13% 9% 1	330
	21st to end	Day	15% 37% 27% 14% 6% 1	330
December	1st to 10th	Day	24% 34% 23% 13% 5% 1	330
	11th to 20th	Day	15% 46% 22% 13% 3	330
	21st to end	Day	28% 36% 24% 9% 2	363
January	1st to 10th	Night	13% 26% 27% 23% 10% 2	1041
	11th to 20th	Night	11% 25% 30% 22% 10% 2	840
	21st to end	Night	8% 26% 33% 22% 10% 2	924
February	1st to 10th	Night	8% 31% 37% 17% 6%	840
	11th to 20th	Night	14% 35% 29% 17% 5%	824
	21st to end	Night	16% 31% 37% 14% 2	692
March	1st to 10th	Night	13% 34% 29% 19% 4 1	840
	11th to 20th	Night	14% 24% 30% 24% 8% 1	840
	21st to end	Night	15% 31% 33% 17% 3	791
April	1st to 10th	Night	14% 32% 34% 16% 3	630
	11th to 20th	Night	15% 30% 30% 20% 5%	623
	21st to end	Night	9% 28% 35% 23% 5%	630
May	1st to 10th	Night	10% 25% 33% 25% 7% 1	630
	11th to 20th	Night	11% 21% 26% 29% 11% 1	621
	21st to end	Night	8% 20% 31% 31% 10% 1	683
June	1st to 10th	Night	4 12% 27% 37% 19% 1	630
	11th to 20th	Night	3 14% 34% 36% 12% 1	630
	21st to end	Night	8% 7% 25% 32% 26% 2	630
July	1st to 10th	Night	5% 5% 16% 38% 32% 4	615
	11th to 20th	Night	4 3 8% 35% 43% 7%	612
	21st to end	Night	6% 3 8% 28% 43% 12%	687
August	1st to 10th	Night	7% 3 11% 33% 38% 9%	597
	11th to 20th	Night	5% 4 13% 42% 32% 4	594
	21st to end	Night	6% 5% 17% 32% 35% 6%	660
September	1st to 10th	Night	6% 6% 18% 37% 29% 5%	600
	11th to 20th	Night	6% 9% 27% 32% 25% 3	600
	21st to end	Night	7% 12% 24% 35% 20% 2	600
October	1st to 10th	Night	7% 18% 25% 31% 17% 2	778
	11th to 20th	Night	7% 24% 30% 24% 12% 3	800
	21st to end	Night	12% 22% 26% 21% 15% 3	880
November	1st to 10th	Night	10% 24% 28% 25% 12% 1	971
	11th to 20th	Night	7% 29% 31% 21% 11% 2	1050
	21st to end	Night	10% 27% 28% 22% 12% 1	1050
December	1st to 10th	Night	12% 28% 32% 19% 7% 2	1050
	11th to 20th	Night	11% 32% 28% 21% 7% 1	1050
	21st to end	Night	14% 29% 34% 17% 5% 1	1155

Page generated at 2026-07-28 01:25:22. Version ac07

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