Taum Sauk Mountain State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Taum Sauk Mountain State Park clear sky chart from 2005-11-06 to 2024-01-31.

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	12% 7% 3 5% 5% 3 5% 5% 6% 7% 42%	74887
	Night	13% 7% 3 5% 4 3 4 4 5% 7% 45%	75255
Transparency	Day	40% 7% 12% 23% 16% 3	74600
	Night	38% 6% 11% 24% 18% 3	75063
Seeing	Day	17% 13% 27% 24% 14% 4	14443
	Night	18% 13% 29% 26% 13% 2	24412

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	15% 9% 3 6% 5% 3 5% 4 5% 4 42%	1521
	11th to 20th	Day	16% 10% 3 6% 5% 3 4 4 5% 7% 38%	1710
	21st to end	Day	13% 10% 4 6% 4 3 4 4 5% 6% 42%	1872
February	1st to 10th	Day	19% 10% 4 6% 6% 2 4 4 4 6% 37%	1620
	11th to 20th	Day	16% 9% 4 6% 4 2 3 6% 6% 6% 38%	1740
	21st to end	Day	16% 11% 3 6% 5% 3 4 4 6% 6% 36%	1480
March	1st to 10th	Day	14% 10% 3 6% 4 2 3 4 5% 6% 44%	1854
	11th to 20th	Day	19% 10% 4 6% 5% 3 4 4 5% 4 36%	1980
	21st to end	Day	19% 10% 4 7% 6% 4 5% 5% 4 7% 29%	2275
April	1st to 10th	Day	11% 7% 3 5% 5% 3 4 4 5% 8% 46%	2160
	11th to 20th	Day	17% 10% 3 6% 5% 2 4 4 4 7% 38%	2134
	21st to end	Day	19% 7% 3 7% 5% 3 4 4 5% 6% 37%	2160
May	1st to 10th	Day	16% 7% 4 5% 6% 3 5% 4 6% 8% 36%	2160
	11th to 20th	Day	17% 5% 3 5% 5% 3 4 4 6% 8% 40%	2411
	21st to end	Day	10% 7% 3 7% 7% 4 7% 6% 6% 8% 35%	2725
June	1st to 10th	Day	8% 6% 3 5% 6% 3 5% 5% 6% 9% 43%	2520
	11th to 20th	Day	6% 3 2 5% 5% 3 6% 6% 7% 9% 48%	2520
	21st to end	Day	5% 3 2 5% 5% 3 6% 6% 8% 10% 46%	2520
July	1st to 10th	Day	9% 4 3 5% 6% 3 6% 6% 7% 10% 40%	2520
	11th to 20th	Day	5% 3 2 5% 6% 4 5% 6% 7% 10% 48%	2498
	21st to end	Day	6% 5% 3 6% 6% 4 7% 6% 7% 10% 41%	2546
August	1st to 10th	Day	8% 4 2 5% 6% 5% 6% 7% 8% 10% 41%	2306
	11th to 20th	Day	9% 6% 3 7% 6% 4 6% 6% 7% 10% 37%	2125
	21st to end	Day	9% 5% 3 5% 5% 3 5% 6% 6% 9% 45%	2376
September	1st to 10th	Day	13% 4 2 4 4 3 4 5% 5% 8% 48%	2160
	11th to 20th	Day	10% 5% 2 5% 6% 3 4 5% 6% 9% 46%	2148
	21st to end	Day	10% 5% 2 4 4 2 4 4 5% 7% 54%	1960
October	1st to 10th	Day	10% 4 2 5% 4 3 4 4 5% 6% 54%	1800
	11th to 20th	Day	13% 8% 2 4 4 3 3 3 4 6% 52%	1800
	21st to end	Day	19% 8% 2 4 3 2 3 3 4 5% 46%	1980
November	1st to 10th	Day	11% 5% 3 4 4 3 4 3 4 5% 54%	1703
	11th to 20th	Day	13% 7% 3 5% 4 2 4 5% 5% 6% 46%	1710
	21st to end	Day	17% 10% 3 5% 4 2 4 3 4 5% 43%	1672
December	1st to 10th	Day	14% 10% 3 7% 5% 3 4 4 5% 7% 40%	1520
	11th to 20th	Day	15% 10% 5% 7% 5% 3 4 4 4 5% 39%	1918
	21st to end	Day	16% 16% 5% 7% 6% 3 4 4 5% 5% 30%	2783
January	1st to 10th	Night	14% 9% 4 6% 5% 3 4 4 4 5% 42%	2639
	11th to 20th	Night	16% 9% 4 6% 5% 3 5% 4 4 6% 39%	2470
	21st to end	Night	15% 8% 5% 6% 5% 2 4 5% 5% 6% 39%	2711
February	1st to 10th	Night	18% 10% 4 6% 4 3 3 4 4 6% 37%	2340
	11th to 20th	Night	16% 7% 3 7% 5% 3 4 3 4 6% 43%	2104
	21st to end	Night	18% 9% 3 6% 5% 3 4 4 5% 5% 39%	1776
March	1st to 10th	Night	17% 9% 2 6% 4 2 3 3 5% 5% 43%	2120
	11th to 20th	Night	20% 9% 3 6% 4 3 4 4 5% 5% 38%	1980
	21st to end	Night	20% 10% 5% 5% 6% 3 4 4 5% 6% 33%	2080
April	1st to 10th	Night	10% 5% 3 4 4 2 5% 4 6% 9% 49%	1800
	11th to 20th	Night	14% 7% 3 6% 5% 3 5% 4 4 6% 44%	1775
	21st to end	Night	19% 7% 3 6% 5% 3 4 4 4 6% 41%	1800
May	1st to 10th	Night	14% 8% 2 4 4 2 4 5% 5% 7% 46%	1800
	11th to 20th	Night	16% 7% 2 5% 4 3 3 4 4 7% 45%	1477
	21st to end	Night	10% 7% 3 6% 6% 4 6% 5% 5% 9% 38%	1551
June	1st to 10th	Night	9% 5% 2 4 4 3 5% 6% 6% 9% 48%	1440
	11th to 20th	Night	6% 3 1 3 3 2 3 4 6% 11% 57%	1440
	21st to end	Night	4 2 1 3 3 3 5% 6% 7% 9% 57%	1440
July	1st to 10th	Night	8% 4 2 4 4 3 4 4 5% 9% 53%	1440
	11th to 20th	Night	6% 3 2 3 3 2 4 4 5% 9% 58%	1458
	21st to end	Night	6% 4 2 5% 4 3 5% 6% 6% 9% 50%	1772
August	1st to 10th	Night	6% 3 2 4 4 3 5% 8% 7% 9% 49%	1630
	11th to 20th	Night	7% 5% 2 4 5% 2 4 5% 5% 10% 52%	1776
	21st to end	Night	7% 5% 2 4 4 2 4 5% 5% 7% 53%	1980
September	1st to 10th	Night	10% 5% 2 4 4 3 4 4 4 8% 52%	1800
	11th to 20th	Night	7% 6% 2 4 5% 3 4 4 5% 7% 53%	1800
	21st to end	Night	9% 5% 2 4 3 2 5% 4 6% 7% 55%	1990
October	1st to 10th	Night	7% 4 2 3 4 2 3 3 4 6% 62%	2160
	11th to 20th	Night	14% 6% 2 4 4 2 3 3 4 5% 54%	2160
	21st to end	Night	19% 7% 2 4 3 3 3 4 4 4 47%	2376
November	1st to 10th	Night	10% 6% 3 4 3 2 3 3 3 6% 57%	2374
	11th to 20th	Night	14% 7% 3 4 4 2 4 4 4 6% 50%	2470
	21st to end	Night	18% 8% 3 4 4 2 3 3 3 5% 45%	2503
December	1st to 10th	Night	15% 10% 3 5% 5% 3 4 4 5% 7% 39%	2660
	11th to 20th	Night	16% 8% 3 6% 5% 3 4 4 4 6% 41%	3279
	21st to end	Night	16% 16% 5% 8% 6% 3 4 4 5% 5% 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	44% 5% 9% 23% 14% 4	1522
	11th to 20th	Day	47% 5% 11% 25% 12% 2	1710
	21st to end	Day	44% 4 12% 23% 14% 3	1872
February	1st to 10th	Day	49% 5% 11% 21% 13% 1	1620
	11th to 20th	Day	45% 6% 13% 20% 13% 5%	1750
	21st to end	Day	47% 6% 8% 22% 11% 6%	1480
March	1st to 10th	Day	42% 4 9% 22% 17% 5%	1854
	11th to 20th	Day	50% 6% 10% 18% 14% 3	1980
	21st to end	Day	54% 6% 12% 17% 10% 1	2275
April	1st to 10th	Day	36% 6% 12% 25% 19% 2	2160
	11th to 20th	Day	47% 5% 9% 19% 16% 4	2134
	21st to end	Day	47% 6% 11% 21% 14% 1	2160
May	1st to 10th	Day	45% 8% 12% 22% 12% 1	2160
	11th to 20th	Day	41% 8% 13% 21% 15% 2	2415
	21st to end	Day	44% 10% 14% 20% 11% 1	2725
June	1st to 10th	Day	35% 8% 14% 25% 16% 1	2520
	11th to 20th	Day	30% 8% 14% 25% 20% 3	2520
	21st to end	Day	28% 10% 18% 23% 16% 5%	2520
July	1st to 10th	Day	35% 10% 15% 24% 12% 4	2451
	11th to 20th	Day	29% 9% 17% 25% 17% 3	2423
	21st to end	Day	35% 11% 14% 28% 11% 1	2405
August	1st to 10th	Day	33% 11% 15% 26% 14%	2292
	11th to 20th	Day	39% 9% 13% 26% 12% 1	2125
	21st to end	Day	34% 8% 16% 22% 16% 5%	2376
September	1st to 10th	Day	32% 7% 14% 27% 15% 4	2160
	11th to 20th	Day	34% 7% 10% 24% 24% 2	2148
	21st to end	Day	29% 7% 8% 28% 25% 3	1960
October	1st to 10th	Day	30% 7% 9% 26% 24% 4	1800
	11th to 20th	Day	35% 5% 7% 24% 23% 6%	1800
	21st to end	Day	41% 5% 7% 25% 18% 5%	1980
November	1st to 10th	Day	34% 4 11% 24% 21% 7%	1703
	11th to 20th	Day	37% 5% 8% 23% 21% 6%	1710
	21st to end	Day	45% 4 9% 23% 18% 2	1672
December	1st to 10th	Day	44% 6% 10% 25% 13% 2	1520
	11th to 20th	Day	47% 5% 7% 20% 19% 1	1915
	21st to end	Day	54% 7% 10% 15% 12% 3	2783
January	1st to 10th	Night	44% 5% 9% 23% 17% 3	2639
	11th to 20th	Night	45% 5% 11% 24% 14% 2	2470
	21st to end	Night	45% 5% 11% 23% 14% 2	2711
February	1st to 10th	Night	48% 5% 10% 22% 14% 2	2340
	11th to 20th	Night	43% 4 12% 21% 17% 3	2105
	21st to end	Night	46% 4 9% 22% 15% 4	1776
March	1st to 10th	Night	43% 4 10% 20% 18% 6%	2120
	11th to 20th	Night	48% 5% 11% 19% 14% 3	1980
	21st to end	Night	52% 6% 12% 20% 10% 1	2080
April	1st to 10th	Night	32% 6% 14% 26% 20% 3	1800
	11th to 20th	Night	40% 6% 10% 23% 17% 5%	1775
	21st to end	Night	44% 5% 9% 24% 15% 2	1800
May	1st to 10th	Night	37% 8% 15% 23% 16% 2	1800
	11th to 20th	Night	40% 8% 12% 21% 18% 2	1478
	21st to end	Night	40% 10% 14% 19% 15% 2	1552
June	1st to 10th	Night	31% 8% 15% 25% 20% 1	1440
	11th to 20th	Night	22% 6% 14% 33% 20% 5%	1440
	21st to end	Night	20% 9% 16% 30% 18% 7%	1440
July	1st to 10th	Night	28% 8% 17% 26% 16% 5%	1400
	11th to 20th	Night	24% 7% 17% 27% 20% 4	1410
	21st to end	Night	27% 10% 15% 31% 16% 1	1673
August	1st to 10th	Night	25% 12% 18% 28% 14% 2	1620
	11th to 20th	Night	27% 9% 15% 27% 20% 2	1776
	21st to end	Night	27% 9% 15% 25% 19% 5%	1980
September	1st to 10th	Night	31% 8% 10% 28% 18% 6%	1800
	11th to 20th	Night	29% 7% 11% 27% 24% 2	1800
	21st to end	Night	27% 6% 10% 24% 28% 4	1990
October	1st to 10th	Night	24% 6% 11% 26% 27% 5%	2160
	11th to 20th	Night	32% 4 8% 27% 23% 6%	2160
	21st to end	Night	40% 5% 8% 22% 19% 5%	2376
November	1st to 10th	Night	29% 4 11% 26% 23% 6%	2374
	11th to 20th	Night	36% 4 8% 23% 23% 6%	2470
	21st to end	Night	42% 4 7% 24% 20% 2	2503
December	1st to 10th	Night	44% 5% 11% 23% 16% 2	2660
	11th to 20th	Night	44% 6% 9% 23% 17% 1	3281
	21st to end	Night	54% 8% 9% 17% 9% 2	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	29% 22% 35% 12% 2	270
	11th to 20th	Day	34% 26% 29% 10% 1	270
	21st to end	Day	22% 35% 30% 11% 1	294
February	1st to 10th	Day	29% 25% 35% 10% 2	240
	11th to 20th	Day	33% 28% 30% 6% 2	240
	21st to end	Day	33% 25% 33% 8% 1 1	198
March	1st to 10th	Day	24% 27% 37% 10% 2	240
	11th to 20th	Day	36% 22% 30% 9% 3	240
	21st to end	Day	30% 24% 34% 10% 2	361
April	1st to 10th	Day	21% 21% 35% 19% 5%	420
	11th to 20th	Day	28% 17% 31% 17% 5% 1	412
	21st to end	Day	24% 19% 35% 15% 6% 1	420
May	1st to 10th	Day	21% 20% 34% 20% 5% 1	423
	11th to 20th	Day	20% 15% 29% 22% 12% 2	571
	21st to end	Day	13% 10% 33% 27% 12% 4	679
June	1st to 10th	Day	11% 7% 26% 27% 24% 5%	630
	11th to 20th	Day	6% 4 25% 40% 21% 4	630
	21st to end	Day	5% 7% 33% 31% 19% 5%	630
July	1st to 10th	Day	11% 3 18% 28% 30% 10%	621
	11th to 20th	Day	5% 3 21% 38% 27% 6%	618
	21st to end	Day	8% 4 18% 37% 26% 7%	684
August	1st to 10th	Day	10% 2 15% 40% 26% 7%	604
	11th to 20th	Day	13% 5% 18% 31% 27% 6%	439
	21st to end	Day	11% 2 17% 29% 29% 13%	495
September	1st to 10th	Day	12% 4 19% 34% 23% 8%	450
	11th to 20th	Day	10% 4 19% 30% 27% 11%	450
	21st to end	Day	13% 8% 24% 29% 19% 7%	430
October	1st to 10th	Day	14% 10% 35% 30% 9% 3	270
	11th to 20th	Day	21% 17% 39% 18% 4	270
	21st to end	Day	32% 20% 28% 18% 3	297
November	1st to 10th	Day	16% 16% 39% 21% 7% 1	270
	11th to 20th	Day	21% 21% 31% 19% 7%	270
	21st to end	Day	31% 18% 29% 17% 4 1	270
December	1st to 10th	Day	20% 23% 34% 16% 5% 2	270
	11th to 20th	Day	27% 23% 29% 17% 3 1	270
	21st to end	Day	29% 26% 33% 9% 3	297
January	1st to 10th	Night	22% 24% 35% 16% 3	950
	11th to 20th	Night	25% 26% 32% 13% 3	950
	21st to end	Night	21% 22% 37% 18% 2	1043
February	1st to 10th	Night	26% 20% 37% 16% 1	900
	11th to 20th	Night	22% 23% 39% 14% 1	709
	21st to end	Night	26% 22% 34% 17% 1	592
March	1st to 10th	Night	26% 18% 35% 19% 2	680
	11th to 20th	Night	23% 17% 34% 23% 3	540
	21st to end	Night	27% 15% 33% 21% 5%	594
April	1st to 10th	Night	13% 20% 37% 26% 4	540
	11th to 20th	Night	18% 17% 32% 25% 7% 1	533
	21st to end	Night	23% 13% 37% 21% 6%	540
May	1st to 10th	Night	19% 9% 34% 28% 9%	540
	11th to 20th	Night	20% 8% 31% 26% 13% 2	531
	21st to end	Night	13% 6% 26% 34% 18% 3	584
June	1st to 10th	Night	11% 4 16% 39% 27% 3	540
	11th to 20th	Night	7% 3 22% 46% 22% 1	540
	21st to end	Night	4 3 24% 41% 26% 2	540
July	1st to 10th	Night	10% 1 10% 34% 34% 10%	525
	11th to 20th	Night	6% 2 15% 43% 29% 6%	522
	21st to end	Night	7% 2 13% 42% 32% 4	591
August	1st to 10th	Night	7% 2 12% 40% 35% 5%	537
	11th to 20th	Night	10% 15% 38% 33% 3	534
	21st to end	Night	8% 2 14% 33% 36% 7%	594
September	1st to 10th	Night	12% 2 14% 36% 32% 5%	540
	11th to 20th	Night	9% 3 15% 35% 32% 6%	540
	21st to end	Night	11% 6% 25% 28% 27% 4	713
October	1st to 10th	Night	9% 7% 28% 32% 21% 3	720
	11th to 20th	Night	17% 13% 33% 25% 11% 1	720
	21st to end	Night	24% 15% 31% 23% 7%	792
November	1st to 10th	Night	12% 14% 38% 26% 10% 1	740
	11th to 20th	Night	21% 16% 31% 26% 6% 1	760
	21st to end	Night	25% 17% 32% 20% 6%	793
December	1st to 10th	Night	22% 19% 33% 22% 4 1	950
	11th to 20th	Night	24% 16% 33% 23% 4	950
	21st to end	Night	28% 19% 32% 19% 2	1045

Page generated at 2024-01-28 04:26:35. Version ac07

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