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 2024-10-20.

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 5% 2 6% 4 5% 5% 4 6% 8% 51%	100900
	Night	2 4 2 5% 4 4 4 4 7% 9% 56%	98000
Transparency	Day	30% 6% 10% 22% 23% 10%	100653
	Night	25% 7% 11% 23% 24% 9%	97837
Seeing	Day	14% 28% 25% 20% 11% 3	15259
	Night	8% 22% 27% 26% 15% 2	25276

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 8% 4 4 4 3 6% 10% 55%	2574
	11th to 20th	Day	4 2 6% 4 4 4 3 6% 8% 59%	2860
	21st to end	Day	8% 4 7% 4 5% 5% 4 5% 7% 50%	3146
February	1st to 10th	Day	4 3 7% 5% 4 4 4 5% 8% 56%	1755
	11th to 20th	Day	3 2 7% 4 3 4 4 5% 8% 59%	1849
	21st to end	Day	5% 3 8% 5% 5% 5% 3 5% 8% 54%	1570
March	1st to 10th	Day	5% 4 5% 3 3 4 4 6% 7% 60%	3162
	11th to 20th	Day	2 11% 6% 10% 5% 4 5% 4 7% 7% 40%	3490
	21st to end	Day	1 6% 4 6% 5% 5% 4 5% 6% 7% 52%	4027
April	1st to 10th	Day	1 5% 2 6% 4 4 4 4 6% 7% 56%	2280
	11th to 20th	Day	3 8% 2 5% 4 4 3 3 5% 7% 55%	2251
	21st to end	Day	3 9% 3 5% 4 4 4 4 6% 9% 50%	2280
May	1st to 10th	Day	2 11% 2 5% 3 3 3 3 5% 6% 57%	3800
	11th to 20th	Day	5% 8% 2 7% 5% 4 5% 4 6% 6% 47%	4139
	21st to end	Day	2 3 1 4 3 3 5% 4 6% 8% 61%	4825
June	1st to 10th	Day	2 4 2 5% 4 4 5% 4 8% 9% 53%	2660
	11th to 20th	Day	2 3 1 4 3 4 4 4 6% 7% 61%	2660
	21st to end	Day	6% 3 2 6% 6% 6% 6% 5% 7% 7% 48%	2660
July	1st to 10th	Day	3 4 2 5% 5% 5% 6% 6% 7% 8% 49%	4430
	11th to 20th	Day	3 4 2 7% 6% 7% 9% 8% 9% 10% 35%	4348
	21st to end	Day	6% 6% 3 9% 7% 7% 8% 6% 9% 9% 29%	4454
August	1st to 10th	Day	5% 7% 3 9% 8% 7% 9% 7% 8% 9% 28%	3952
	11th to 20th	Day	4 5% 2 6% 5% 5% 6% 4 7% 10% 47%	3726
	21st to end	Day	5% 6% 2 8% 6% 6% 6% 5% 8% 11% 36%	4180
September	1st to 10th	Day	8% 7% 3 8% 5% 5% 5% 4 6% 6% 43%	2280
	11th to 20th	Day	6% 6% 2 5% 5% 4 4 4 6% 7% 53%	2266
	21st to end	Day	4 4 2 5% 3 4 4 4 4 6% 60%	2090
October	1st to 10th	Day	6% 5% 3 5% 4 3 4 4 5% 6% 55%	1917
	11th to 20th	Day	3 3 2 3 2 3 3 3 3 5% 71%	1890
	21st to end	Day	3 6% 2 5% 3 2 2 2 3 4 67%	1980
November	1st to 10th	Day	1 2 1 4 2 3 3 3 4 8% 69%	1701
	11th to 20th	Day	3 1 3 3 3 3 3 5% 8% 67%	1710
	21st to end	Day	1 5% 2 5% 3 5% 4 3 5% 8% 60%	1710
December	1st to 10th	Day	1 3 2 6% 2 4 3 3 6% 8% 63%	1558
	11th to 20th	Day	1 5% 2 5% 3 4 5% 5% 7% 9% 53%	1926
	21st to end	Day	4 2 6% 3 3 3 3 6% 8% 62%	2794
January	1st to 10th	Night	3 2 8% 5% 4 4 4 7% 9% 53%	4410
	11th to 20th	Night	1 2 1 6% 3 4 4 4 10% 9% 56%	4110
	21st to end	Night	4 2 6% 4 5% 5% 4 7% 9% 54%	4521
February	1st to 10th	Night	4 3 6% 4 2 3 3 6% 10% 59%	2423
	11th to 20th	Night	5% 2 6% 4 4 4 3 5% 9% 59%	2218
	21st to end	Night	4 3 6% 4 4 3 4 5% 7% 59%	1884
March	1st to 10th	Night	1 4 2 6% 3 3 4 3 7% 7% 61%	3687
	11th to 20th	Night	2 10% 5% 8% 3 3 4 4 6% 7% 50%	3490
	21st to end	Night	1 4 3 6% 3 4 4 4 8% 8% 56%	3618
April	1st to 10th	Night	1 4 2 4 3 3 3 4 6% 9% 63%	1900
	11th to 20th	Night	2 7% 2 4 3 3 4 3 5% 8% 59%	1877
	21st to end	Night	2 5% 2 4 4 3 4 4 5% 8% 57%	1900
May	1st to 10th	Night	3 6% 1 3 3 3 2 3 4 7% 65%	3170
	11th to 20th	Night	3 9% 3 5% 4 4 4 4 7% 9% 48%	2750
	21st to end	Night	2 3 1 4 3 4 4 4 5% 6% 65%	2762
June	1st to 10th	Night	2 3 2 3 4 5% 5% 5% 7% 10% 54%	1520
	11th to 20th	Night	1 2 1 3 3 4 3 4 6% 7% 66%	1520
	21st to end	Night	4 5% 1 4 5% 4 5% 5% 9% 8% 48%	1520
July	1st to 10th	Night	3 5% 3 7% 6% 5% 5% 6% 8% 9% 43%	2540
	11th to 20th	Night	2 4 2 5% 4 5% 6% 6% 11% 13% 43%	2618
	21st to end	Night	5% 5% 2 5% 4 5% 6% 6% 9% 10% 43%	3109
August	1st to 10th	Night	4 5% 2 7% 6% 6% 9% 6% 11% 12% 32%	2983
	11th to 20th	Night	3 3 1 4 4 5% 6% 6% 10% 14% 45%	3113
	21st to end	Night	2 4 2 6% 5% 7% 8% 8% 12% 13% 35%	3487
September	1st to 10th	Night	5% 4 2 5% 5% 4 4 4 7% 8% 52%	1900
	11th to 20th	Night	4 3 1 4 3 4 4 4 5% 7% 62%	1914
	21st to end	Night	4 4 1 3 3 4 3 2 5% 5% 65%	2090
October	1st to 10th	Night	3 5% 1 4 3 3 4 3 5% 6% 63%	2259
	11th to 20th	Night	2 3 1 2 2 2 2 2 4 6% 74%	2274
	21st to end	Night	3 4 1 4 2 3 3 2 4 6% 67%	2376
November	1st to 10th	Night	1 2 1 2 2 3 2 3 5% 7% 73%	2355
	11th to 20th	Night	2 1 2 2 2 3 2 5% 8% 73%	2470
	21st to end	Night	1 4 2 4 3 5% 3 4 5% 8% 60%	2470
December	1st to 10th	Night	3 2 4 3 4 4 4 6% 9% 62%	2618
	11th to 20th	Night	1 3 2 6% 4 5% 4 4 8% 9% 55%	3271
	21st to end	Night	2 2 6% 5% 4 5% 4 7% 7% 57%	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	26% 7% 9% 30% 23% 6%	2575
	11th to 20th	Day	24% 10% 12% 30% 20% 4	2860
	21st to end	Day	34% 6% 7% 23% 24% 6%	3146
February	1st to 10th	Day	28% 7% 11% 24% 22% 9%	1755
	11th to 20th	Day	26% 5% 8% 26% 25% 9%	1859
	21st to end	Day	31% 5% 6% 16% 29% 14%	1570
March	1st to 10th	Day	22% 6% 5% 22% 36% 9%	3162
	11th to 20th	Day	41% 7% 6% 22% 21% 4	3490
	21st to end	Day	29% 8% 8% 30% 21% 4	4027
April	1st to 10th	Day	25% 5% 8% 25% 26% 10%	2280
	11th to 20th	Day	29% 4 7% 23% 27% 10%	2254
	21st to end	Day	31% 5% 8% 24% 26% 6%	2280
May	1st to 10th	Day	28% 5% 7% 16% 31% 14%	3800
	11th to 20th	Day	35% 6% 9% 20% 23% 8%	4143
	21st to end	Day	18% 6% 6% 15% 36% 19%	4825
June	1st to 10th	Day	24% 7% 12% 22% 22% 13%	2660
	11th to 20th	Day	20% 6% 6% 18% 26% 23%	2660
	21st to end	Day	32% 6% 9% 21% 20% 12%	2660
July	1st to 10th	Day	31% 6% 10% 14% 19% 21%	4361
	11th to 20th	Day	39% 6% 17% 28% 8% 3	4273
	21st to end	Day	44% 8% 14% 22% 7% 4	4314
August	1st to 10th	Day	45% 9% 20% 16% 6% 3	3938
	11th to 20th	Day	31% 5% 19% 20% 15% 10%	3762
	21st to end	Day	38% 6% 20% 21% 13% 2	4179
September	1st to 10th	Day	38% 7% 10% 19% 19% 7%	2280
	11th to 20th	Day	31% 6% 8% 18% 27% 12%	2266
	21st to end	Day	24% 5% 6% 24% 33% 8%	2090
October	1st to 10th	Day	30% 4 7% 20% 26% 13%	1917
	11th to 20th	Day	17% 3 5% 19% 42% 13%	1890
	21st to end	Day	23% 2 5% 26% 34% 10%	1980
November	1st to 10th	Day	15% 3 9% 25% 35% 13%	1701
	11th to 20th	Day	17% 4 8% 29% 34% 8%	1710
	21st to end	Day	25% 4 7% 21% 31% 12%	1710
December	1st to 10th	Day	21% 5% 15% 26% 23% 9%	1558
	11th to 20th	Day	27% 6% 11% 19% 27% 10%	1924
	21st to end	Day	22% 7% 9% 20% 28% 14%	2794
January	1st to 10th	Night	27% 10% 9% 22% 25% 7%	4410
	11th to 20th	Night	25% 13% 9% 28% 20% 5%	4110
	21st to end	Night	27% 10% 8% 25% 24% 6%	4521
February	1st to 10th	Night	24% 6% 12% 25% 24% 9%	2423
	11th to 20th	Night	28% 5% 8% 28% 24% 7%	2218
	21st to end	Night	27% 4 6% 19% 33% 11%	1884
March	1st to 10th	Night	23% 7% 5% 18% 37% 10%	3687
	11th to 20th	Night	34% 7% 7% 26% 21% 4	3490
	21st to end	Night	25% 10% 7% 33% 22% 3	3618
April	1st to 10th	Night	20% 4 10% 30% 26% 10%	1900
	11th to 20th	Night	24% 5% 9% 24% 30% 8%	1877
	21st to end	Night	24% 6% 13% 28% 24% 5%	1900
May	1st to 10th	Night	19% 7% 7% 20% 34% 12%	3170
	11th to 20th	Night	31% 9% 10% 24% 18% 8%	2751
	21st to end	Night	18% 7% 8% 15% 36% 16%	2762
June	1st to 10th	Night	22% 7% 16% 21% 21% 13%	1520
	11th to 20th	Night	17% 4 8% 20% 26% 24%	1520
	21st to end	Night	29% 8% 13% 19% 20% 12%	1520
July	1st to 10th	Night	34% 8% 11% 15% 13% 19%	2500
	11th to 20th	Night	27% 7% 28% 28% 6% 4	2570
	21st to end	Night	32% 9% 22% 25% 10% 1	3011
August	1st to 10th	Night	38% 12% 24% 15% 6% 4	2974
	11th to 20th	Night	25% 10% 24% 19% 14% 7%	3143
	21st to end	Night	34% 8% 25% 20% 11% 2	3487
September	1st to 10th	Night	29% 6% 13% 27% 18% 6%	1900
	11th to 20th	Night	21% 5% 11% 22% 27% 13%	1914
	21st to end	Night	22% 5% 8% 27% 31% 7%	2090
October	1st to 10th	Night	23% 7% 9% 21% 29% 12%	2259
	11th to 20th	Night	14% 3 7% 20% 42% 14%	2274
	21st to end	Night	20% 4 6% 29% 32% 10%	2376
November	1st to 10th	Night	13% 3 9% 27% 37% 12%	2355
	11th to 20th	Night	12% 5% 6% 33% 32% 10%	2470
	21st to end	Night	23% 5% 7% 22% 29% 14%	2470
December	1st to 10th	Night	21% 6% 11% 29% 25% 7%	2618
	11th to 20th	Night	27% 8% 9% 20% 26% 10%	3272
	21st to end	Night	26% 8% 9% 20% 24% 12%	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% 34% 24% 15% 7% 1	270
	11th to 20th	Day	17% 40% 24% 17% 1 1	270
	21st to end	Day	7% 41% 27% 18% 7% 1	297
February	1st to 10th	Day	13% 52% 21% 10% 4 1	270
	11th to 20th	Day	19% 49% 18% 11% 3 1	270
	21st to end	Day	32% 41% 17% 9%	225
March	1st to 10th	Day	24% 40% 20% 11% 4 1	289
	11th to 20th	Day	18% 42% 26% 10% 3 1	460
	21st to end	Day	26% 46% 22% 5% 1	506
April	1st to 10th	Day	20% 45% 23% 8% 2 1	460
	11th to 20th	Day	26% 47% 18% 6% 2	452
	21st to end	Day	26% 41% 25% 7% 2	460
May	1st to 10th	Day	20% 43% 26% 8% 3	463
	11th to 20th	Day	13% 28% 27% 21% 8% 2	656
	21st to end	Day	14% 28% 26% 24% 8% 1	734
June	1st to 10th	Day	5% 21% 31% 26% 15% 2	680
	11th to 20th	Day	8% 25% 28% 23% 13% 3	680
	21st to end	Day	10% 19% 25% 25% 17% 4	680
July	1st to 10th	Day	7% 11% 22% 31% 22% 7%	671
	11th to 20th	Day	6% 6% 18% 32% 30% 8%	625
	21st to end	Day	9% 8% 17% 32% 27% 7%	531
August	1st to 10th	Day	12% 10% 25% 28% 20% 5%	487
	11th to 20th	Day	9% 12% 27% 32% 15% 5%	477
	21st to end	Day	8% 11% 27% 34% 16% 4	539
September	1st to 10th	Day	10% 12% 25% 30% 18% 4	490
	11th to 20th	Day	11% 22% 31% 24% 11% 2	476
	21st to end	Day	9% 19% 30% 24% 13% 4	300
October	1st to 10th	Day	12% 27% 27% 18% 11% 5%	300
	11th to 20th	Day	12% 38% 26% 12% 6% 5%	297
	21st to end	Day	18% 33% 26% 13% 7% 3	297
November	1st to 10th	Day	14% 40% 26% 14% 4 2	270
	11th to 20th	Day	12% 34% 27% 15% 11% 1	270
	21st to end	Day	10% 37% 28% 16% 8% 1	270
December	1st to 10th	Day	20% 36% 25% 14% 4 1	270
	11th to 20th	Day	9% 50% 22% 15% 4	270
	21st to end	Day	22% 40% 26% 10% 2	297
January	1st to 10th	Night	10% 25% 29% 24% 11% 2	943
	11th to 20th	Night	10% 24% 30% 23% 10% 2	760
	21st to end	Night	5% 25% 34% 23% 11% 2	836
February	1st to 10th	Night	5% 32% 38% 18% 7% 1	760
	11th to 20th	Night	9% 35% 31% 19% 5%	744
	21st to end	Night	15% 32% 36% 15% 2	628
March	1st to 10th	Night	10% 35% 29% 20% 5% 1	760
	11th to 20th	Night	10% 23% 31% 27% 8% 1	760
	21st to end	Night	12% 32% 34% 17% 4	716
April	1st to 10th	Night	12% 35% 34% 15% 3	570
	11th to 20th	Night	12% 30% 31% 21% 6%	563
	21st to end	Night	8% 29% 35% 23% 5%	570
May	1st to 10th	Night	9% 25% 34% 24% 8% 1	570
	11th to 20th	Night	9% 20% 26% 31% 13% 2	561
	21st to end	Night	8% 21% 29% 31% 10% 1	617
June	1st to 10th	Night	3 12% 25% 38% 20% 1	570
	11th to 20th	Night	3 15% 32% 36% 13% 1	570
	21st to end	Night	7% 6% 24% 32% 28% 3	570
July	1st to 10th	Night	5% 5% 14% 37% 35% 4	555
	11th to 20th	Night	4 3 7% 33% 46% 7%	552
	21st to end	Night	6% 3 7% 26% 46% 13%	624
August	1st to 10th	Night	7% 2 8% 33% 40% 10%	567
	11th to 20th	Night	5% 4 13% 41% 32% 5%	564
	21st to end	Night	5% 4 17% 32% 36% 6%	627
September	1st to 10th	Night	6% 5% 16% 37% 30% 5%	570
	11th to 20th	Night	6% 8% 25% 32% 26% 3	570
	21st to end	Night	7% 12% 22% 35% 21% 2	570
October	1st to 10th	Night	7% 18% 25% 31% 18% 2	739
	11th to 20th	Night	5% 24% 30% 25% 13% 3	758
	21st to end	Night	10% 22% 25% 22% 17% 4	792
November	1st to 10th	Night	7% 24% 27% 28% 13% 1	875
	11th to 20th	Night	5% 29% 30% 22% 12% 2	950
	21st to end	Night	8% 26% 27% 24% 13% 1	950
December	1st to 10th	Night	11% 28% 32% 20% 7% 2	950
	11th to 20th	Night	8% 33% 28% 23% 8% 1	950
	21st to end	Night	11% 30% 34% 18% 6% 1	1045

Page generated at 2024-10-17 11:09:42. Version ac07

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