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 2024-11-04.

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% 4 5% 4 6% 7% 34%	101400
	Night	16% 9% 3 7% 5% 4 4 4 5% 7% 37%	97631
Transparency	Day	45% 8% 13% 21% 12% 2	104961
	Night	43% 8% 13% 21% 13% 2	102158
Seeing	Day	24% 19% 28% 18% 8% 2	14867
	Night	21% 18% 28% 23% 9% 1	24121

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	13% 14% 5% 8% 5% 4 4 3 5% 5% 35%	2517
	11th to 20th	Day	13% 16% 9% 13% 6% 5% 4 3 4 5% 23%	2588
	21st to end	Day	19% 14% 6% 9% 6% 4 4 3 4 5% 25%	3124
February	1st to 10th	Day	16% 10% 4 9% 5% 5% 5% 4 6% 6% 30%	1710
	11th to 20th	Day	14% 9% 3 8% 6% 6% 5% 4 6% 6% 32%	1750
	21st to end	Day	16% 14% 4 9% 5% 4 4 4 4 5% 31%	1570
March	1st to 10th	Day	25% 11% 3 7% 4 4 4 3 4 6% 29%	3177
	11th to 20th	Day	9% 9% 3 7% 5% 5% 5% 3 6% 7% 40%	3480
	21st to end	Day	19% 10% 3 6% 4 3 3 3 4 5% 39%	3998
April	1st to 10th	Day	16% 10% 3 8% 6% 5% 6% 3 5% 6% 32%	2280
	11th to 20th	Day	15% 10% 3 7% 5% 5% 4 3 5% 5% 37%	2254
	21st to end	Day	15% 8% 2 7% 5% 5% 5% 4 6% 6% 36%	2280
May	1st to 10th	Day	28% 8% 2 6% 4 3 5% 4 5% 6% 29%	4187
	11th to 20th	Day	24% 10% 4 9% 5% 5% 4 4 5% 6% 25%	4398
	21st to end	Day	13% 5% 2 6% 4 4 4 4 7% 9% 41%	4837
June	1st to 10th	Day	14% 7% 3 6% 6% 5% 5% 4 7% 9% 34%	2660
	11th to 20th	Day	14% 7% 3 6% 6% 5% 5% 5% 7% 9% 33%	2660
	21st to end	Day	12% 7% 2 7% 5% 6% 5% 4 7% 10% 36%	2660
July	1st to 10th	Day	8% 6% 3 8% 6% 6% 6% 5% 7% 9% 35%	4440
	11th to 20th	Day	10% 6% 3 6% 5% 5% 6% 5% 7% 10% 38%	4440
	21st to end	Day	13% 9% 4 8% 6% 5% 5% 5% 6% 7% 32%	4730
August	1st to 10th	Day	21% 7% 3 7% 5% 5% 5% 4 6% 8% 29%	4104
	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% 46%	1698
	11th to 20th	Day	15% 11% 3 7% 4 4 5% 4 5% 6% 37%	1696
	21st to end	Day	18% 9% 2 7% 4 4 4 3 6% 7% 35%	1520
December	1st to 10th	Day	18% 12% 3 10% 6% 6% 4 3 5% 6% 28%	1520
	11th to 20th	Day	20% 11% 4 6% 4 4 4 4 5% 5% 32%	1906
	21st to end	Day	17% 13% 5% 11% 6% 6% 6% 4 5% 5% 22%	2772
January	1st to 10th	Night	15% 9% 3 7% 5% 5% 5% 4 5% 8% 35%	4429
	11th to 20th	Night	14% 13% 6% 11% 5% 5% 4 3 5% 5% 29%	4369
	21st to end	Night	21% 12% 4 7% 6% 4 4 3 5% 6% 27%	4532
February	1st to 10th	Night	15% 11% 3 7% 5% 4 4 4 6% 6% 35%	2470
	11th to 20th	Night	14% 10% 3 8% 5% 5% 6% 5% 5% 7% 32%	2314
	21st to end	Night	17% 10% 3 8% 5% 5% 5% 4 6% 7% 32%	1884
March	1st to 10th	Night	21% 13% 4 6% 4 4 4 3 4 5% 33%	3660
	11th to 20th	Night	9% 8% 3 6% 4 5% 4 3 6% 7% 43%	3479
	21st to end	Night	13% 11% 3 8% 5% 4 4 3 3 5% 42%	3632
April	1st to 10th	Night	15% 9% 3 8% 6% 6% 5% 5% 5% 6% 32%	1900
	11th to 20th	Night	16% 8% 2 7% 5% 4 5% 3 4 7% 38%	1875
	21st to end	Night	18% 7% 3 5% 4 4 4 3 5% 5% 42%	1900
May	1st to 10th	Night	26% 9% 3 7% 4 3 4 4 5% 6% 30%	2783
	11th to 20th	Night	24% 10% 4 7% 3 3 4 3 5% 6% 30%	2495
	21st to end	Night	14% 8% 2 7% 5% 4 5% 4 6% 8% 38%	2738
June	1st to 10th	Night	14% 7% 1 6% 4 3 5% 3 7% 8% 42%	1520
	11th to 20th	Night	12% 7% 2 5% 5% 3 6% 5% 5% 9% 40%	1520
	21st to end	Night	12% 6% 2 5% 3 4 4 3 7% 10% 43%	1520
July	1st to 10th	Night	9% 6% 2 7% 6% 5% 6% 4 6% 8% 40%	2520
	11th to 20th	Night	10% 7% 2 5% 5% 5% 5% 5% 8% 9% 39%	2520
	21st to end	Night	16% 6% 2 6% 4 5% 5% 4 6% 7% 39%	2820
August	1st to 10th	Night	21% 8% 3 6% 4 5% 4 3 6% 8% 33%	2825
	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	12% 6% 2 6% 4 4 4 4 5% 6% 47%	2453
	11th to 20th	Night	15% 9% 3 6% 4 4 4 4 5% 6% 39%	2482
	21st to end	Night	14% 7% 3 6% 5% 5% 4 4 7% 7% 37%	2660
December	1st to 10th	Night	19% 10% 4 9% 6% 5% 4 4 5% 5% 29%	2660
	11th to 20th	Night	17% 11% 3 6% 5% 4 5% 4 6% 6% 32%	3288
	21st to end	Night	18% 11% 4 9% 5% 5% 5% 4 5% 6% 27%	4884

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	46% 8% 16% 21% 7% 2	2518
	11th to 20th	Day	58% 9% 11% 14% 7% 1	2588
	21st to end	Day	58% 8% 10% 17% 7% 1	3124
February	1st to 10th	Day	51% 8% 13% 17% 10% 1	1710
	11th to 20th	Day	48% 9% 11% 21% 10% 1	1759
	21st to end	Day	53% 6% 11% 20% 8% 2	1570
March	1st to 10th	Day	52% 8% 12% 20% 6% 2	3180
	11th to 20th	Day	38% 10% 17% 23% 11% 2	3480
	21st to end	Day	46% 6% 10% 17% 18% 3	3998
April	1st to 10th	Day	48% 9% 9% 19% 12% 3	2280
	11th to 20th	Day	45% 7% 10% 22% 13% 3	2254
	21st to end	Day	44% 9% 10% 19% 14% 4	2280
May	1st to 10th	Day	53% 8% 10% 19% 8% 1	4199
	11th to 20th	Day	56% 10% 11% 14% 7% 1	4402
	21st to end	Day	35% 10% 14% 24% 15% 2	4837
June	1st to 10th	Day	43% 9% 15% 20% 12% 1	2660
	11th to 20th	Day	44% 9% 14% 20% 10% 2	2660
	21st to end	Day	40% 9% 14% 25% 12%	2660
July	1st to 10th	Day	42% 10% 14% 22% 11%	4370
	11th to 20th	Day	38% 10% 17% 24% 12% 1	4365
	21st to end	Day	48% 8% 12% 17% 15% 1	4579
August	1st to 10th	Day	51% 8% 13% 19% 9%	4091
	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	38% 5% 14% 23% 17% 2	1698
	11th to 20th	Day	46% 7% 12% 20% 14% 2	1696
	21st to end	Day	44% 8% 14% 25% 8% 1	1520
December	1st to 10th	Day	56% 7% 15% 14% 8% 1	1520
	11th to 20th	Day	50% 8% 17% 19% 6%	1906
	21st to end	Day	57% 11% 12% 15% 5%	2772
January	1st to 10th	Night	43% 9% 16% 23% 8% 2	4429
	11th to 20th	Night	50% 10% 15% 17% 7% 1	4369
	21st to end	Night	54% 8% 12% 16% 8% 1	4532
February	1st to 10th	Night	45% 8% 15% 22% 9% 1	2470
	11th to 20th	Night	46% 9% 13% 19% 11% 2	2316
	21st to end	Night	48% 7% 11% 19% 12% 3	1884
March	1st to 10th	Night	51% 8% 10% 19% 10% 2	3670
	11th to 20th	Night	35% 10% 18% 25% 11% 1	3480
	21st to end	Night	43% 6% 9% 18% 19% 5%	3632
April	1st to 10th	Night	48% 8% 11% 19% 12% 2	1900
	11th to 20th	Night	43% 7% 11% 21% 16% 1	1875
	21st to end	Night	41% 8% 11% 21% 17% 3	1900
May	1st to 10th	Night	53% 8% 9% 22% 8% 1	2790
	11th to 20th	Night	51% 11% 14% 14% 9% 1	2496
	21st to end	Night	39% 11% 15% 19% 12% 3	2739
June	1st to 10th	Night	40% 7% 11% 25% 16% 1	1520
	11th to 20th	Night	37% 10% 16% 24% 11% 1	1520
	21st to end	Night	33% 9% 16% 29% 12% 1	1520
July	1st to 10th	Night	39% 10% 15% 18% 15% 2	2480
	11th to 20th	Night	36% 11% 17% 23% 13% 1	2472
	21st to end	Night	41% 9% 15% 17% 17% 1	2730
August	1st to 10th	Night	47% 9% 16% 19% 8%	2814
	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	36% 7% 13% 23% 18% 3	2453
	11th to 20th	Night	42% 6% 13% 22% 13% 3	2482
	21st to end	Night	42% 8% 14% 24% 10% 1	2660
December	1st to 10th	Night	52% 8% 14% 18% 7% 1	2660
	11th to 20th	Night	47% 9% 15% 18% 10% 1	3288
	21st to end	Night	52% 10% 13% 19% 5%	4884

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	33% 28% 29% 8% 2 1	180
	11th to 20th	Day	41% 27% 26% 7% 1	200
	21st to end	Day	26% 32% 30% 9% 2	297
February	1st to 10th	Day	32% 34% 27% 6% 1	270
	11th to 20th	Day	34% 30% 30% 5% 1	357
	21st to end	Day	34% 27% 28% 10% 1	382
March	1st to 10th	Day	33% 26% 27% 11% 3	460
	11th to 20th	Day	30% 29% 27% 10% 2 1	460
	21st to end	Day	32% 29% 23% 11% 4 1	506
April	1st to 10th	Day	30% 28% 25% 12% 5%	460
	11th to 20th	Day	27% 26% 27% 11% 7% 2	452
	21st to end	Day	27% 23% 33% 11% 5% 2	460
May	1st to 10th	Day	31% 23% 27% 11% 6% 2	463
	11th to 20th	Day	22% 21% 34% 16% 6% 1	487
	21st to end	Day	19% 13% 28% 24% 13% 3	529
June	1st to 10th	Day	19% 17% 29% 24% 8% 2	490
	11th to 20th	Day	19% 16% 29% 25% 9% 2	490
	21st to end	Day	13% 17% 36% 22% 10% 1	490
July	1st to 10th	Day	12% 10% 30% 28% 16% 5%	485
	11th to 20th	Day	10% 8% 31% 31% 17% 2	484
	21st to end	Day	15% 12% 33% 27% 10% 3	532
August	1st to 10th	Day	14% 10% 26% 27% 17% 5%	486
	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% 20% 26% 22% 8% 2	374
	11th to 20th	Day	26% 26% 28% 15% 4	356
	21st to end	Day	31% 27% 32% 9% 1	180
December	1st to 10th	Day	38% 28% 23% 6% 4 1	180
	11th to 20th	Day	41% 24% 24% 9% 2	180
	21st to end	Day	33% 25% 32% 8% 2	198
January	1st to 10th	Night	24% 29% 33% 12% 3	760
	11th to 20th	Night	26% 25% 30% 18% 2	760
	21st to end	Night	20% 28% 34% 16% 2	836
February	1st to 10th	Night	26% 25% 31% 17% 1	760
	11th to 20th	Night	28% 28% 33% 10% 1	743
	21st to end	Night	30% 25% 31% 12% 2	628
March	1st to 10th	Night	26% 24% 32% 14% 3	760
	11th to 20th	Night	26% 25% 29% 15% 4 1	760
	21st to end	Night	22% 27% 32% 14% 4	836
April	1st to 10th	Night	24% 24% 31% 17% 4	760
	11th to 20th	Night	22% 22% 31% 20% 5%	751
	21st to end	Night	24% 19% 29% 23% 5%	760
May	1st to 10th	Night	25% 16% 28% 22% 8% 1	546
	11th to 20th	Night	19% 11% 37% 25% 7%	374
	21st to end	Night	17% 9% 25% 36% 13% 1	411
June	1st to 10th	Night	17% 8% 24% 36% 15%	380
	11th to 20th	Night	15% 9% 27% 37% 12% 1	380
	21st to end	Night	12% 6% 31% 39% 12%	380
July	1st to 10th	Night	13% 5% 24% 39% 18% 1	370
	11th to 20th	Night	11% 7% 19% 44% 17% 2	368
	21st to end	Night	15% 3 26% 38% 16% 2	461
August	1st to 10th	Night	16% 4 17% 39% 22% 2	567
	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% 19% 33% 22% 10% 1	755
	11th to 20th	Night	25% 20% 29% 20% 6% 1	760
	21st to end	Night	20% 23% 33% 19% 5%	760
December	1st to 10th	Night	28% 24% 28% 15% 5%	760
	11th to 20th	Night	24% 24% 32% 17% 3	760
	21st to end	Night	24% 26% 31% 17% 2	836

Page generated at 2024-11-01 22:47:47. Version ac07

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