Eckley Miners' Village
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Eckley Miners' Village clear sky chart from 2005-11-06 to 2025-08-05.

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	16% 9% 3 7% 5% 5% 5% 4 6% 7% 34%	125977
	Night	15% 9% 3 7% 5% 4 4 4 5% 7% 37%	122103
Transparency	Day	45% 8% 13% 20% 12% 2	129520
	Night	42% 8% 13% 21% 13% 2	126646
Seeing	Day	24% 20% 28% 18% 8% 2	15800
	Night	22% 18% 28% 23% 9% 1	25037

By Month

Percentage Cloud Cover NE (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	11% 12% 4 8% 5% 4 4 3 6% 7% 35%	3597
	11th to 20th	Day	12% 14% 7% 15% 6% 5% 4 3 4 5% 26%	3680
	21st to end	Day	16% 12% 5% 8% 6% 5% 3 3 4 5% 33%	4466
February	1st to 10th	Day	15% 10% 4 10% 5% 5% 5% 4 6% 6% 29%	1800
	11th to 20th	Day	14% 10% 4 8% 6% 6% 5% 4 6% 6% 31%	1845
	21st to end	Day	16% 13% 4 8% 5% 4 4 4 5% 5% 31%	1650
March	1st to 10th	Day	20% 10% 3 7% 5% 4 4 3 4 5% 35%	4565
	11th to 20th	Day	11% 9% 3 7% 5% 5% 5% 3 6% 8% 40%	4980
	21st to end	Day	16% 8% 3 6% 4 4 4 4 5% 6% 39%	5732
April	1st to 10th	Day	16% 10% 3 8% 6% 5% 6% 3 5% 6% 32%	2400
	11th to 20th	Day	15% 11% 3 8% 6% 5% 4 3 5% 6% 37%	2374
	21st to end	Day	15% 8% 2 7% 5% 5% 5% 4 6% 6% 37%	2400
May	1st to 10th	Day	28% 9% 2 6% 4 4 5% 4 5% 7% 27%	6009
	11th to 20th	Day	23% 9% 3 8% 5% 4 4 4 5% 7% 28%	6318
	21st to end	Day	19% 7% 3 6% 4 4 5% 5% 7% 9% 32%	6949
June	1st to 10th	Day	14% 7% 2 6% 6% 5% 5% 4 7% 9% 35%	2800
	11th to 20th	Day	16% 7% 3 6% 6% 5% 5% 4 7% 9% 33%	2800
	21st to end	Day	12% 7% 2 7% 5% 6% 5% 4 6% 10% 36%	2800
July	1st to 10th	Day	8% 6% 3 8% 6% 6% 6% 5% 7% 9% 36%	6360
	11th to 20th	Day	10% 7% 3 8% 6% 6% 7% 6% 8% 10% 30%	6360
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 4 6% 9% 36%	6800
August	1st to 10th	Day	21% 7% 3 7% 5% 5% 5% 4 6% 8% 30%	4156
	11th to 20th	Day	13% 8% 3 7% 4 5% 5% 4 6% 8% 38%	3828
	21st to end	Day	15% 7% 2 4 4 3 4 4 6% 8% 43%	4180
September	1st to 10th	Day	16% 6% 2 6% 4 4 4 4 6% 7% 41%	2280
	11th to 20th	Day	14% 5% 2 4 3 3 4 4 6% 6% 48%	2279
	21st to end	Day	20% 8% 3 6% 4 5% 4 3 5% 6% 35%	2040
October	1st to 10th	Day	19% 7% 2 5% 4 5% 3 3 6% 7% 39%	1900
	11th to 20th	Day	16% 7% 2 6% 5% 5% 4 3 5% 7% 40%	1900
	21st to end	Day	19% 9% 3 6% 4 4 5% 3 5% 6% 35%	2037
November	1st to 10th	Day	13% 8% 3 6% 4 3 3 3 4 7% 47%	1761
	11th to 20th	Day	14% 11% 3 6% 4 4 5% 4 5% 6% 37%	1785
	21st to end	Day	19% 9% 2 7% 4 5% 5% 3 6% 7% 35%	1600
December	1st to 10th	Day	13% 10% 3 9% 6% 5% 5% 3 5% 6% 35%	2600
	11th to 20th	Day	19% 12% 4 8% 4 3 3 4 5% 5% 33%	2986
	21st to end	Day	15% 12% 5% 12% 5% 5% 6% 4 5% 6% 26%	3960
January	1st to 10th	Night	11% 8% 3 8% 5% 5% 5% 4 6% 8% 35%	6349
	11th to 20th	Night	12% 11% 5% 11% 5% 5% 5% 4 5% 6% 31%	6202
	21st to end	Night	16% 10% 4 7% 6% 5% 4 4 6% 7% 33%	6490
February	1st to 10th	Night	15% 11% 3 7% 5% 4 4 4 6% 6% 35%	2600
	11th to 20th	Night	15% 10% 3 8% 5% 5% 5% 5% 5% 6% 32%	2439
	21st to end	Night	16% 9% 3 8% 5% 5% 5% 4 6% 7% 32%	1980
March	1st to 10th	Night	17% 10% 3 7% 5% 4 4 3 4 5% 37%	5272
	11th to 20th	Night	11% 7% 2 6% 4 4 4 3 6% 7% 46%	4979
	21st to end	Night	14% 10% 3 7% 5% 4 4 3 4 6% 39%	5198
April	1st to 10th	Night	16% 9% 4 8% 5% 6% 5% 5% 5% 6% 31%	2000
	11th to 20th	Night	16% 9% 2 7% 5% 4 5% 3 5% 7% 37%	1975
	21st to end	Night	17% 7% 3 6% 4 4 4 3 5% 6% 42%	2000
May	1st to 10th	Night	27% 9% 3 7% 4 3 4 4 5% 6% 27%	3975
	11th to 20th	Night	22% 10% 3 7% 4 4 4 3 5% 6% 32%	3575
	21st to end	Night	21% 8% 2 6% 4 4 4 3 6% 8% 34%	3926
June	1st to 10th	Night	14% 7% 2 7% 4 3 4 3 7% 7% 42%	1600
	11th to 20th	Night	13% 7% 2 5% 5% 4 5% 5% 5% 9% 40%	1600
	21st to end	Night	12% 6% 2 5% 3 4 4 3 7% 10% 44%	1600
July	1st to 10th	Night	9% 7% 3 7% 6% 5% 5% 4 6% 9% 39%	3600
	11th to 20th	Night	13% 9% 3 7% 5% 5% 6% 5% 7% 8% 33%	3600
	21st to end	Night	13% 5% 2 6% 4 4 4 3 6% 7% 46%	4049
August	1st to 10th	Night	21% 8% 3 6% 3 5% 4 3 6% 8% 33%	2861
	11th to 20th	Night	14% 8% 2 7% 4 4 3 3 5% 6% 43%	2966
	21st to end	Night	12% 5% 2 4 3 4 4 3 6% 7% 49%	3476
September	1st to 10th	Night	16% 6% 2 5% 5% 3 4 3 5% 6% 46%	1900
	11th to 20th	Night	10% 7% 2 6% 3 3 4 2 5% 6% 51%	1900
	21st to end	Night	19% 7% 2 6% 4 3 3 3 5% 5% 41%	2137
October	1st to 10th	Night	19% 7% 3 6% 4 4 3 3 4 6% 42%	2280
	11th to 20th	Night	14% 8% 2 6% 4 4 4 3 4 6% 45%	2280
	21st to end	Night	19% 8% 3 6% 3 4 4 4 5% 7% 38%	2560
November	1st to 10th	Night	11% 6% 2 6% 4 4 4 3 5% 6% 48%	2537
	11th to 20th	Night	15% 9% 3 6% 5% 4 4 4 5% 6% 39%	2613
	21st to end	Night	14% 8% 3 7% 6% 5% 4 4 7% 7% 36%	2800
December	1st to 10th	Night	13% 10% 4 9% 5% 5% 4 3 5% 6% 37%	4580
	11th to 20th	Night	20% 12% 3 6% 4 4 4 3 5% 5% 34%	5208
	21st to end	Night	18% 13% 5% 8% 5% 4 4 3 4 5% 31%	6996

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	42% 9% 13% 21% 14% 2	3598
	11th to 20th	Day	56% 8% 9% 15% 10% 2	3710
	21st to end	Day	51% 7% 10% 20% 12%	4466
February	1st to 10th	Day	51% 9% 13% 17% 10% 1	1800
	11th to 20th	Day	49% 8% 11% 21% 10% 1	1854
	21st to end	Day	52% 6% 12% 21% 8% 2	1650
March	1st to 10th	Day	47% 7% 12% 19% 9% 5%	4568
	11th to 20th	Day	39% 9% 17% 23% 8% 4	4980
	21st to end	Day	43% 8% 11% 14% 20% 4	5732
April	1st to 10th	Day	49% 9% 9% 18% 12% 3	2400
	11th to 20th	Day	46% 7% 11% 21% 13% 2	2374
	21st to end	Day	43% 9% 10% 20% 15% 4	2400
May	1st to 10th	Day	55% 9% 12% 16% 8% 1	6018
	11th to 20th	Day	52% 9% 10% 19% 9% 1	6322
	21st to end	Day	44% 10% 13% 20% 11% 1	6949
June	1st to 10th	Day	43% 9% 14% 20% 13% 1	2800
	11th to 20th	Day	45% 9% 14% 20% 10% 2	2800
	21st to end	Day	40% 9% 14% 24% 12%	2800
July	1st to 10th	Day	42% 10% 12% 23% 13%	6290
	11th to 20th	Day	43% 11% 17% 20% 9%	6285
	21st to end	Day	42% 7% 12% 20% 18% 1	6604
August	1st to 10th	Day	51% 8% 13% 19% 9%	4143
	11th to 20th	Day	41% 9% 14% 27% 9%	3867
	21st to end	Day	36% 8% 13% 30% 12% 1	4180
September	1st to 10th	Day	41% 7% 13% 20% 17% 2	2280
	11th to 20th	Day	34% 6% 11% 24% 22% 2	2279
	21st to end	Day	48% 6% 9% 17% 18% 2	2040
October	1st to 10th	Day	40% 6% 10% 20% 19% 5%	3160
	11th to 20th	Day	34% 7% 9% 27% 16% 7%	3140
	21st to end	Day	30% 6% 16% 24% 22% 2	3339
November	1st to 10th	Day	37% 5% 14% 23% 18% 2	1761
	11th to 20th	Day	45% 8% 12% 20% 14% 2	1785
	21st to end	Day	44% 8% 15% 24% 8% 1	1600
December	1st to 10th	Day	48% 7% 16% 22% 7% 1	2600
	11th to 20th	Day	51% 6% 16% 19% 8%	2986
	21st to end	Day	51% 11% 14% 14% 10%	3960
January	1st to 10th	Night	38% 9% 15% 21% 14% 2	6349
	11th to 20th	Night	45% 10% 15% 17% 9% 4	6247
	21st to end	Night	46% 8% 13% 15% 16% 2	6490
February	1st to 10th	Night	46% 8% 14% 22% 9% 1	2600
	11th to 20th	Night	47% 8% 13% 19% 11% 2	2441
	21st to end	Night	48% 7% 11% 19% 13% 3	1980
March	1st to 10th	Night	46% 7% 13% 18% 11% 5%	5282
	11th to 20th	Night	34% 9% 20% 24% 9% 4	4980
	21st to end	Night	43% 7% 8% 17% 21% 4	5198
April	1st to 10th	Night	49% 8% 11% 19% 11% 2	2000
	11th to 20th	Night	43% 8% 11% 20% 16% 1	1975
	21st to end	Night	41% 8% 11% 21% 17% 3	2000
May	1st to 10th	Night	54% 8% 11% 18% 8% 2	3982
	11th to 20th	Night	49% 11% 12% 16% 11% 1	3576
	21st to end	Night	45% 9% 13% 20% 10% 2	3927
June	1st to 10th	Night	40% 7% 11% 25% 16% 1	1600
	11th to 20th	Night	38% 10% 16% 24% 11% 1	1600
	21st to end	Night	34% 9% 16% 28% 13% 1	1600
July	1st to 10th	Night	41% 9% 14% 20% 15% 2	3560
	11th to 20th	Night	44% 11% 15% 19% 10% 1	3552
	21st to end	Night	34% 9% 14% 24% 19% 1	3930
August	1st to 10th	Night	47% 9% 16% 19% 8% 1	2850
	11th to 20th	Night	41% 7% 14% 23% 14%	2993
	21st to end	Night	32% 8% 12% 32% 15% 1	3476
September	1st to 10th	Night	39% 6% 11% 25% 17% 2	1900
	11th to 20th	Night	35% 5% 11% 25% 22% 2	1900
	21st to end	Night	43% 6% 9% 21% 19% 1	2137
October	1st to 10th	Night	41% 7% 11% 21% 19% 1	3800
	11th to 20th	Night	30% 6% 11% 27% 20% 6%	3779
	21st to end	Night	30% 6% 16% 27% 20% 2	4208
November	1st to 10th	Night	35% 7% 13% 23% 18% 3	2537
	11th to 20th	Night	43% 6% 12% 22% 14% 3	2613
	21st to end	Night	43% 8% 14% 23% 10% 1	2800
December	1st to 10th	Night	45% 7% 16% 27% 5% 1	4580
	11th to 20th	Night	49% 7% 13% 20% 11% 1	5208
	21st to end	Night	51% 9% 11% 18% 12% 1	6996

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	37% 28% 27% 7% 2 1	200
	11th to 20th	Day	42% 27% 25% 6%	223
	21st to end	Day	26% 35% 28% 8% 2	330
February	1st to 10th	Day	33% 34% 26% 5% 1	300
	11th to 20th	Day	38% 29% 28% 5% 1	392
	21st to end	Day	33% 28% 29% 9% 1	414
March	1st to 10th	Day	34% 25% 28% 10% 3	500
	11th to 20th	Day	30% 29% 28% 10% 2 1	500
	21st to end	Day	32% 29% 24% 10% 4 1	550
April	1st to 10th	Day	32% 28% 24% 11% 4	500
	11th to 20th	Day	29% 26% 26% 11% 6% 2	492
	21st to end	Day	26% 24% 32% 11% 5% 2	500
May	1st to 10th	Day	31% 22% 28% 11% 6% 2	503
	11th to 20th	Day	23% 21% 33% 15% 6% 1	527
	21st to end	Day	21% 14% 28% 23% 12% 2	573
June	1st to 10th	Day	19% 18% 29% 25% 8% 2	530
	11th to 20th	Day	21% 16% 29% 24% 9% 2	530
	21st to end	Day	13% 16% 36% 24% 9% 1	530
July	1st to 10th	Day	12% 10% 30% 29% 15% 5%	525
	11th to 20th	Day	10% 9% 31% 30% 17% 3	524
	21st to end	Day	14% 12% 34% 28% 10% 3	576
August	1st to 10th	Day	14% 10% 27% 27% 17% 5%	502
	11th to 20th	Day	13% 10% 26% 28% 18% 5%	479
	21st to end	Day	16% 11% 28% 24% 14% 8%	539
September	1st to 10th	Day	21% 12% 22% 23% 15% 7%	490
	11th to 20th	Day	13% 9% 30% 23% 16% 9%	490
	21st to end	Day	28% 14% 25% 19% 10% 3	490
October	1st to 10th	Day	26% 14% 23% 21% 11% 5%	490
	11th to 20th	Day	22% 20% 29% 20% 7% 2	490
	21st to end	Day	25% 21% 32% 16% 6% 1	511
November	1st to 10th	Day	22% 21% 27% 21% 8% 2	395
	11th to 20th	Day	25% 27% 30% 15% 3	385
	21st to end	Day	35% 27% 29% 9% 1	200
December	1st to 10th	Day	37% 30% 25% 6% 4 1	200
	11th to 20th	Day	41% 25% 24% 9% 2	200
	21st to end	Day	32% 23% 33% 10% 2	220
January	1st to 10th	Night	25% 29% 32% 12% 2	800
	11th to 20th	Night	27% 25% 29% 17% 2	800
	21st to end	Night	20% 29% 34% 15% 2	880
February	1st to 10th	Night	26% 25% 31% 17% 1	800
	11th to 20th	Night	30% 27% 33% 9% 1	783
	21st to end	Night	30% 25% 32% 12% 2	660
March	1st to 10th	Night	27% 24% 31% 15% 3	800
	11th to 20th	Night	26% 25% 29% 16% 4 1	800
	21st to end	Night	23% 27% 32% 14% 4	880
April	1st to 10th	Night	25% 23% 31% 17% 4	800
	11th to 20th	Night	22% 22% 31% 20% 5%	791
	21st to end	Night	24% 19% 29% 23% 5%	800
May	1st to 10th	Night	26% 16% 28% 22% 8% 1	574
	11th to 20th	Night	20% 12% 36% 26% 7%	394
	21st to end	Night	19% 9% 25% 34% 12% 1	433
June	1st to 10th	Night	17% 8% 25% 35% 15%	400
	11th to 20th	Night	16% 10% 27% 35% 12% 1	400
	21st to end	Night	12% 6% 30% 40% 12%	400
July	1st to 10th	Night	13% 5% 23% 39% 18% 1	390
	11th to 20th	Night	12% 7% 19% 44% 16% 2	388
	21st to end	Night	14% 3 26% 37% 17% 2	486
August	1st to 10th	Night	16% 4 17% 39% 22% 2	579
	11th to 20th	Night	14% 7% 15% 40% 23% 2	667
	21st to end	Night	15% 6% 22% 33% 24% 2	836
September	1st to 10th	Night	17% 8% 24% 30% 19% 2	760
	11th to 20th	Night	13% 6% 26% 28% 22% 5%	760
	21st to end	Night	23% 11% 21% 31% 14% 1	760
October	1st to 10th	Night	23% 11% 23% 25% 15% 3	760
	11th to 20th	Night	19% 15% 31% 27% 8% 1	760
	21st to end	Night	25% 18% 29% 22% 6%	836
November	1st to 10th	Night	16% 20% 33% 21% 9% 1	780
	11th to 20th	Night	25% 20% 29% 20% 5% 1	800
	21st to end	Night	21% 23% 33% 18% 5%	800
December	1st to 10th	Night	28% 24% 29% 15% 4	800
	11th to 20th	Night	26% 24% 31% 17% 3	800
	21st to end	Night	24% 26% 31% 17% 3	880

Page generated at 2025-08-02 01:32:28. Version ac07

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