Little Black Township
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Black Township clear sky chart from 2005-11-06 to 2024-03-08.

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	14% 9% 4 8% 6% 3 5% 5% 5% 7% 33%	78429
	Night	13% 10% 4 8% 6% 3 4 5% 5% 6% 35%	81186
Transparency	Day	49% 7% 13% 21% 9% 1	78129
	Night	49% 6% 12% 22% 10% 1	81006
Seeing	Day	16% 9% 30% 26% 14% 4	14997
	Night	17% 8% 32% 30% 11% 1	25102

By Month

Percentage Cloud Cover SE (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% 15% 8% 17% 6% 3 5% 5% 4 5% 20%	2527
	11th to 20th	Day	8% 13% 7% 14% 8% 5% 8% 9% 7% 6% 15%	2530
	21st to end	Day	11% 18% 8% 15% 8% 3 4 5% 5% 7% 16%	2886
February	1st to 10th	Day	9% 10% 6% 11% 7% 4 6% 5% 5% 7% 31%	1710
	11th to 20th	Day	10% 10% 4 9% 7% 4 4 6% 6% 7% 32%	1693
	21st to end	Day	12% 12% 5% 9% 9% 4 6% 4 6% 5% 29%	1570
March	1st to 10th	Day	14% 10% 6% 6% 6% 4 4 5% 5% 7% 35%	1870
	11th to 20th	Day	12% 9% 5% 8% 8% 4 5% 4 4 7% 32%	1957
	21st to end	Day	17% 10% 4 7% 6% 3 5% 5% 5% 7% 31%	2308
April	1st to 10th	Day	15% 11% 5% 7% 6% 4 4 4 6% 7% 31%	2160
	11th to 20th	Day	21% 11% 3 8% 5% 3 5% 4 5% 6% 29%	2134
	21st to end	Day	20% 11% 4 6% 6% 3 5% 4 5% 5% 29%	2244
May	1st to 10th	Day	16% 7% 3 7% 7% 4 5% 5% 6% 7% 33%	2520
	11th to 20th	Day	17% 8% 3 7% 6% 3 4 4 5% 6% 37%	2479
	21st to end	Day	15% 6% 3 5% 6% 3 6% 5% 7% 8% 36%	2725
June	1st to 10th	Day	14% 6% 3 6% 5% 3 4 4 6% 9% 41%	2520
	11th to 20th	Day	13% 6% 3 6% 7% 4 5% 5% 6% 7% 37%	2520
	21st to end	Day	11% 5% 3 6% 6% 3 6% 6% 6% 11% 39%	2520
July	1st to 10th	Day	8% 4 2 4 4 3 6% 6% 8% 10% 45%	2520
	11th to 20th	Day	9% 5% 2 5% 6% 3 5% 5% 7% 10% 43%	2520
	21st to end	Day	8% 4 2 5% 5% 3 6% 5% 6% 9% 48%	2743
August	1st to 10th	Day	10% 5% 2 5% 6% 3 5% 6% 7% 8% 42%	2483
	11th to 20th	Day	14% 5% 2 6% 4 3 5% 5% 5% 9% 41%	2269
	21st to end	Day	13% 6% 2 4 4 3 4 5% 6% 9% 44%	2376
September	1st to 10th	Day	14% 7% 2 5% 5% 2 4 5% 5% 8% 43%	2160
	11th to 20th	Day	13% 5% 2 6% 4 3 4 5% 6% 9% 44%	2146
	21st to end	Day	16% 7% 3 7% 5% 3 5% 5% 5% 7% 37%	1944
October	1st to 10th	Day	16% 6% 2 6% 5% 3 5% 5% 6% 7% 39%	1800
	11th to 20th	Day	20% 12% 4 6% 5% 3 4 5% 5% 7% 31%	1800
	21st to end	Day	20% 11% 4 7% 5% 4 4 4 4 7% 32%	1823
November	1st to 10th	Day	14% 10% 3 7% 6% 2 4 4 6% 7% 37%	1672
	11th to 20th	Day	16% 11% 6% 9% 8% 3 5% 5% 5% 7% 26%	1559
	21st to end	Day	14% 11% 5% 7% 7% 3 4 4 5% 7% 32%	1520
December	1st to 10th	Day	11% 13% 5% 12% 9% 5% 6% 6% 5% 5% 23%	1520
	11th to 20th	Day	12% 15% 7% 10% 8% 4 6% 6% 4 6% 21%	1918
	21st to end	Day	20% 20% 6% 12% 7% 4 4 3 4 3 16%	2783
January	1st to 10th	Night	11% 14% 7% 13% 8% 4 4 4 4 5% 26%	4428
	11th to 20th	Night	8% 12% 5% 13% 11% 5% 7% 8% 7% 5% 18%	4440
	21st to end	Night	11% 17% 10% 14% 6% 4 4 4 4 5% 20%	4779
February	1st to 10th	Night	7% 12% 5% 10% 7% 3 6% 5% 5% 7% 32%	2470
	11th to 20th	Night	8% 9% 5% 9% 6% 4 6% 6% 5% 7% 37%	2372
	21st to end	Night	13% 11% 4 8% 8% 4 5% 4 4 6% 33%	1884
March	1st to 10th	Night	12% 8% 4 6% 6% 3 4 5% 6% 7% 39%	2251
	11th to 20th	Night	12% 9% 5% 7% 6% 4 4 3 5% 5% 40%	2016
	21st to end	Night	18% 10% 4 6% 5% 4 4 4 5% 6% 36%	2047
April	1st to 10th	Night	19% 10% 4 7% 5% 3 4 4 4 7% 34%	1800
	11th to 20th	Night	23% 8% 2 5% 4 2 5% 5% 4 6% 37%	1775
	21st to end	Night	19% 10% 3 5% 5% 3 4 4 5% 7% 36%	1711
May	1st to 10th	Night	20% 10% 3 6% 6% 3 4 5% 5% 8% 31%	1440
	11th to 20th	Night	17% 7% 3 6% 5% 4 3 4 5% 6% 39%	1416
	21st to end	Night	14% 5% 2 5% 5% 4 5% 5% 6% 8% 41%	1551
June	1st to 10th	Night	12% 6% 2 5% 5% 3 4 5% 6% 8% 45%	1440
	11th to 20th	Night	11% 6% 2 5% 6% 3 6% 6% 6% 8% 42%	1440
	21st to end	Night	8% 5% 2 4 5% 4 5% 5% 7% 8% 48%	1440
July	1st to 10th	Night	6% 4 2 4 3 2 4 5% 6% 8% 56%	1440
	11th to 20th	Night	8% 6% 2 3 4 3 5% 5% 4 10% 51%	1440
	21st to end	Night	5% 4 1 4 4 2 4 5% 6% 10% 56%	1575
August	1st to 10th	Night	9% 4 2 4 5% 3 4 5% 5% 8% 52%	1453
	11th to 20th	Night	13% 5% 2 5% 5% 3 4 4 5% 7% 48%	1631
	21st to end	Night	13% 5% 2 4 4 2 5% 4 5% 6% 51%	1980
September	1st to 10th	Night	10% 5% 2 4 4 3 4 4 5% 7% 51%	1800
	11th to 20th	Night	11% 6% 2 4 4 2 4 5% 4 6% 52%	1800
	21st to end	Night	12% 7% 2 5% 5% 2 3 5% 5% 7% 46%	2008
October	1st to 10th	Night	14% 5% 2 5% 5% 3 4 4 4 6% 46%	2160
	11th to 20th	Night	16% 10% 3 6% 4 4 4 5% 5% 6% 36%	2160
	21st to end	Night	18% 11% 4 6% 5% 3 5% 5% 5% 6% 32%	2533
November	1st to 10th	Night	15% 9% 3 6% 5% 3 4 4 5% 7% 39%	2406
	11th to 20th	Night	14% 11% 5% 8% 6% 4 5% 4 5% 6% 32%	2617
	21st to end	Night	13% 11% 5% 8% 7% 3 4 5% 5% 7% 32%	2660
December	1st to 10th	Night	10% 13% 5% 10% 8% 4 5% 5% 5% 7% 28%	2660
	11th to 20th	Night	12% 14% 6% 12% 9% 4 5% 5% 4 6% 23%	3279
	21st to end	Night	24% 16% 6% 10% 6% 3 3 4 4 5% 19%	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	65% 5% 9% 16% 4	2528
	11th to 20th	Day	67% 6% 8% 12% 6%	2530
	21st to end	Day	67% 6% 11% 12% 4	2886
February	1st to 10th	Day	51% 6% 12% 20% 10% 1	1710
	11th to 20th	Day	49% 7% 12% 23% 8% 1	1702
	21st to end	Day	56% 5% 11% 17% 9% 2	1570
March	1st to 10th	Day	50% 6% 14% 18% 11% 1	1870
	11th to 20th	Day	51% 6% 12% 19% 11% 1	1957
	21st to end	Day	53% 6% 11% 21% 8% 1	2308
April	1st to 10th	Day	52% 7% 10% 19% 12%	2160
	11th to 20th	Day	55% 6% 9% 18% 10% 2	2134
	21st to end	Day	55% 6% 11% 17% 10% 1	2244
May	1st to 10th	Day	48% 8% 14% 21% 8% 1	2520
	11th to 20th	Day	48% 6% 13% 22% 10% 1	2483
	21st to end	Day	45% 7% 12% 23% 12% 1	2725
June	1st to 10th	Day	39% 8% 14% 27% 12% 1	2520
	11th to 20th	Day	44% 9% 11% 23% 13% 1	2520
	21st to end	Day	38% 8% 17% 25% 10% 1	2520
July	1st to 10th	Day	30% 9% 18% 30% 12% 1	2451
	11th to 20th	Day	35% 9% 14% 26% 13% 3	2445
	21st to end	Day	30% 9% 17% 26% 16% 1	2591
August	1st to 10th	Day	37% 9% 15% 28% 9% 2	2468
	11th to 20th	Day	40% 7% 15% 27% 11%	2269
	21st to end	Day	36% 8% 13% 27% 15% 1	2376
September	1st to 10th	Day	40% 6% 15% 26% 14%	2160
	11th to 20th	Day	36% 9% 18% 29% 8% 1	2146
	21st to end	Day	45% 7% 12% 28% 8%	1944
October	1st to 10th	Day	43% 7% 12% 28% 9%	1800
	11th to 20th	Day	53% 7% 12% 20% 8% 1	1800
	21st to end	Day	53% 5% 14% 20% 8%	1823
November	1st to 10th	Day	46% 6% 12% 22% 12% 2	1672
	11th to 20th	Day	58% 6% 12% 17% 6% 1	1559
	21st to end	Day	51% 6% 15% 20% 6% 1	1520
December	1st to 10th	Day	62% 5% 11% 17% 5%	1520
	11th to 20th	Day	62% 6% 12% 14% 5% 1	1915
	21st to end	Day	72% 6% 6% 12% 5%	2783
January	1st to 10th	Night	59% 5% 10% 19% 6% 1	4428
	11th to 20th	Night	63% 7% 10% 14% 6%	4440
	21st to end	Night	65% 6% 8% 16% 5% 1	4779
February	1st to 10th	Night	51% 6% 10% 21% 11% 2	2470
	11th to 20th	Night	45% 7% 14% 24% 10% 2	2373
	21st to end	Night	53% 5% 13% 19% 9% 2	1884
March	1st to 10th	Night	45% 6% 14% 23% 10% 2	2251
	11th to 20th	Night	46% 5% 12% 22% 14% 2	2016
	21st to end	Night	50% 6% 11% 20% 12% 1	2047
April	1st to 10th	Night	51% 6% 8% 18% 17% 1	1800
	11th to 20th	Night	48% 6% 10% 20% 13% 3	1775
	21st to end	Night	47% 6% 9% 22% 13% 2	1711
May	1st to 10th	Night	52% 7% 14% 15% 13% 1	1440
	11th to 20th	Night	45% 5% 12% 24% 12% 2	1417
	21st to end	Night	40% 8% 15% 21% 15% 1	1552
June	1st to 10th	Night	35% 8% 14% 27% 14% 1	1440
	11th to 20th	Night	38% 8% 14% 24% 15% 2	1440
	21st to end	Night	31% 9% 16% 30% 12% 2	1440
July	1st to 10th	Night	26% 7% 14% 32% 19% 2	1400
	11th to 20th	Night	29% 9% 16% 27% 17% 3	1392
	21st to end	Night	23% 8% 17% 33% 16% 3	1487
August	1st to 10th	Night	30% 7% 17% 30% 14% 3	1444
	11th to 20th	Night	36% 7% 14% 26% 16% 1	1631
	21st to end	Night	33% 8% 15% 25% 17% 3	1980
September	1st to 10th	Night	32% 7% 13% 31% 17% 1	1800
	11th to 20th	Night	32% 7% 14% 34% 13%	1800
	21st to end	Night	37% 7% 13% 31% 11% 1	2008
October	1st to 10th	Night	38% 6% 12% 30% 12% 1	2160
	11th to 20th	Night	46% 8% 12% 23% 10% 1	2160
	21st to end	Night	52% 6% 12% 20% 11%	2533
November	1st to 10th	Night	45% 4 13% 23% 14% 1	2406
	11th to 20th	Night	52% 6% 14% 16% 11% 1	2617
	21st to end	Night	51% 6% 15% 22% 6% 1	2660
December	1st to 10th	Night	56% 6% 13% 20% 5%	2660
	11th to 20th	Night	62% 5% 11% 16% 5% 1	3281
	21st to end	Night	68% 5% 7% 15% 4	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	16% 12% 33% 24% 12% 3	270
	11th to 20th	Day	22% 10% 36% 25% 7% 1	270
	21st to end	Day	19% 9% 35% 29% 7% 2	297
February	1st to 10th	Day	11% 13% 47% 18% 7% 3	270
	11th to 20th	Day	15% 16% 42% 18% 9%	270
	21st to end	Day	16% 13% 44% 24% 4	225
March	1st to 10th	Day	16% 14% 39% 18% 12% 1	261
	11th to 20th	Day	18% 11% 36% 22% 10% 3	240
	21st to end	Day	20% 13% 31% 22% 10% 3	394
April	1st to 10th	Day	20% 13% 34% 24% 8% 1	420
	11th to 20th	Day	28% 11% 27% 22% 10% 2	412
	21st to end	Day	22% 13% 29% 23% 11% 2	446
May	1st to 10th	Day	18% 14% 32% 27% 6% 2	603
	11th to 20th	Day	20% 11% 29% 23% 14% 3	625
	21st to end	Day	17% 10% 25% 28% 13% 7%	679
June	1st to 10th	Day	13% 5% 30% 31% 16% 5%	630
	11th to 20th	Day	13% 8% 33% 29% 14% 4	630
	21st to end	Day	11% 7% 28% 30% 16% 7%	630
July	1st to 10th	Day	9% 4 19% 30% 27% 12%	621
	11th to 20th	Day	10% 5% 29% 31% 17% 9%	618
	21st to end	Day	6% 4 25% 34% 24% 8%	684
August	1st to 10th	Day	10% 4 23% 30% 24% 8%	626
	11th to 20th	Day	16% 4 17% 26% 27% 9%	583
	21st to end	Day	15% 6% 24% 28% 21% 6%	495
September	1st to 10th	Day	19% 6% 23% 26% 21% 6%	450
	11th to 20th	Day	12% 5% 26% 33% 20% 4	450
	21st to end	Day	19% 10% 27% 29% 13% 3	414
October	1st to 10th	Day	15% 12% 26% 27% 14% 7%	270
	11th to 20th	Day	23% 19% 29% 21% 7% 1	270
	21st to end	Day	25% 14% 39% 18% 3 1	297
November	1st to 10th	Day	19% 12% 30% 27% 9% 2	270
	11th to 20th	Day	20% 15% 37% 23% 5%	270
	21st to end	Day	20% 13% 42% 19% 7%	270
December	1st to 10th	Day	14% 14% 44% 21% 7%	270
	11th to 20th	Day	21% 15% 39% 19% 6%	270
	21st to end	Day	28% 15% 37% 18% 3	297
January	1st to 10th	Night	14% 11% 37% 29% 8% 1	950
	11th to 20th	Night	17% 10% 38% 28% 5% 1	950
	21st to end	Night	18% 8% 37% 30% 7% 1	1045
February	1st to 10th	Night	13% 11% 38% 31% 7% 1	950
	11th to 20th	Night	13% 11% 41% 27% 8%	898
	21st to end	Night	19% 12% 38% 27% 4	628
March	1st to 10th	Night	18% 10% 35% 29% 6% 1	751
	11th to 20th	Night	16% 10% 36% 28% 8% 1	576
	21st to end	Night	23% 9% 30% 26% 9% 3	594
April	1st to 10th	Night	21% 11% 36% 24% 6% 1	540
	11th to 20th	Night	26% 8% 29% 29% 8%	533
	21st to end	Night	22% 8% 31% 30% 8% 1	540
May	1st to 10th	Night	24% 8% 34% 28% 5% 1	540
	11th to 20th	Night	20% 7% 33% 30% 9% 1	531
	21st to end	Night	16% 4 25% 37% 16% 1	584
June	1st to 10th	Night	13% 7% 27% 37% 15% 1	540
	11th to 20th	Night	14% 6% 29% 40% 10% 1	540
	21st to end	Night	10% 4 24% 44% 17% 1	540
July	1st to 10th	Night	6% 3 22% 38% 29% 2	525
	11th to 20th	Night	11% 4 22% 36% 25% 2	522
	21st to end	Night	6% 2 20% 44% 26% 2	591
August	1st to 10th	Night	9% 2 15% 46% 26% 2	537
	11th to 20th	Night	15% 3 18% 32% 29% 3	534
	21st to end	Night	14% 4 20% 37% 22% 2	594
September	1st to 10th	Night	10% 4 25% 38% 19% 4	540
	11th to 20th	Night	14% 4 27% 33% 19% 3	540
	21st to end	Night	14% 9% 31% 34% 12% 1	715
October	1st to 10th	Night	17% 6% 29% 30% 17% 1	720
	11th to 20th	Night	20% 12% 34% 27% 7% 1	720
	21st to end	Night	23% 9% 32% 27% 9%	792
November	1st to 10th	Night	20% 9% 32% 30% 8% 1	740
	11th to 20th	Night	19% 11% 40% 22% 7%	907
	21st to end	Night	19% 14% 37% 24% 6%	950
December	1st to 10th	Night	17% 10% 41% 24% 7% 1	950
	11th to 20th	Night	20% 10% 37% 24% 8% 1	950
	21st to end	Night	26% 12% 33% 24% 5%	1045

Page generated at 2024-03-05 06:24:03. Version ac07

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