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 2025-02-21.

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% 8% 3 6% 4 4 4 4 6% 7% 43%	108591
	Night	13% 8% 3 6% 4 4 4 3 5% 6% 45%	110156
Transparency	Day	38% 6% 11% 24% 17% 4	112226
	Night	37% 6% 11% 24% 19% 4	114662
Seeing	Day	18% 13% 28% 24% 14% 4	15878
	Night	18% 13% 29% 26% 12% 2	25847

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	14% 10% 4 8% 5% 5% 4 3 5% 4 39%	3635
	11th to 20th	Day	9% 8% 3 8% 4 3 3 3 5% 6% 47%	4080
	21st to end	Day	18% 7% 3 7% 3 4 4 3 5% 5% 41%	4488
February	1st to 10th	Day	18% 11% 3 7% 5% 4 4 3 4 6% 36%	1800
	11th to 20th	Day	16% 9% 3 7% 3 3 3 4 6% 6% 39%	1939
	21st to end	Day	15% 11% 3 7% 4 4 4 4 6% 6% 37%	1570
March	1st to 10th	Day	19% 13% 3 6% 3 3 3 2 4 4 39%	3216
	11th to 20th	Day	13% 8% 2 5% 3 3 3 3 5% 5% 51%	3480
	21st to end	Day	15% 8% 2 6% 5% 4 4 4 5% 7% 39%	3994
April	1st to 10th	Day	11% 7% 3 6% 4 4 4 3 5% 8% 45%	2280
	11th to 20th	Day	15% 10% 3 6% 4 3 4 3 5% 6% 40%	2254
	21st to end	Day	19% 8% 2 7% 5% 4 4 3 5% 6% 37%	2280
May	1st to 10th	Day	13% 7% 3 7% 5% 6% 6% 4 7% 8% 32%	3765
	11th to 20th	Day	17% 8% 3 7% 4 4 4 3 5% 8% 37%	4289
	21st to end	Day	12% 8% 2 7% 5% 4 4 4 5% 7% 41%	4824
June	1st to 10th	Day	8% 6% 2 6% 5% 5% 5% 4 6% 9% 42%	2660
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 4 7% 9% 48%	2660
	21st to end	Day	5% 4 2 5% 5% 5% 5% 5% 8% 10% 46%	2660
July	1st to 10th	Day	11% 4 3 6% 5% 4 6% 5% 7% 9% 40%	4440
	11th to 20th	Day	4 3 2 5% 4 5% 5% 5% 7% 11% 49%	4390
	21st to end	Day	7% 6% 3 8% 6% 6% 7% 5% 8% 9% 33%	4465
August	1st to 10th	Day	5% 4 1 4 4 5% 4 5% 7% 9% 53%	4054
	11th to 20th	Day	11% 5% 2 7% 5% 4 5% 4 6% 8% 42%	3729
	21st to end	Day	7% 5% 2 5% 4 4 4 4 5% 8% 52%	4180
September	1st to 10th	Day	12% 5% 2 5% 3 3 5% 3 5% 7% 49%	2280
	11th to 20th	Day	10% 6% 2 6% 5% 4 4 4 6% 9% 45%	2267
	21st to end	Day	10% 6% 1 5% 3 3 4 3 5% 7% 52%	2068
October	1st to 10th	Day	9% 4 1 6% 3 3 4 3 5% 6% 56%	1900
	11th to 20th	Day	12% 8% 2 4 3 4 3 2 4 5% 53%	1900
	21st to end	Day	18% 8% 2 5% 3 3 3 3 4 5% 46%	2090
November	1st to 10th	Day	12% 6% 2 5% 4 4 4 2 4 5% 53%	1794
	11th to 20th	Day	13% 8% 3 6% 4 3 4 4 5% 6% 47%	1800
	21st to end	Day	17% 11% 3 6% 3 3 4 2 4 4 43%	1760
December	1st to 10th	Day	9% 10% 3 6% 3 3 3 3 4 6% 50%	2610
	11th to 20th	Day	14% 11% 4 7% 3 3 4 3 4 6% 41%	3008
	21st to end	Day	19% 20% 4 8% 4 3 3 3 4 4 27%	3982
January	1st to 10th	Night	14% 10% 6% 10% 5% 4 5% 3 4 5% 34%	6325
	11th to 20th	Night	12% 9% 3 10% 4 4 4 3 4 5% 42%	5900
	21st to end	Night	18% 9% 4 7% 4 3 4 3 4 4 40%	6490
February	1st to 10th	Night	18% 11% 4 7% 4 4 3 3 5% 6% 36%	2600
	11th to 20th	Night	16% 8% 4 7% 4 4 3 2 4 6% 42%	2345
	21st to end	Night	17% 9% 3 6% 4 4 4 4 5% 5% 40%	1885
March	1st to 10th	Night	21% 11% 2 6% 3 2 3 2 4 4 42%	3651
	11th to 20th	Night	14% 7% 2 5% 3 4 3 3 5% 5% 49%	3480
	21st to end	Night	14% 10% 3 7% 5% 4 4 4 6% 7% 37%	3636
April	1st to 10th	Night	10% 6% 2 5% 3 4 4 3 6% 8% 49%	1900
	11th to 20th	Night	14% 7% 3 6% 4 4 4 3 4 6% 44%	1875
	21st to end	Night	19% 7% 2 6% 4 4 3 3 4 6% 41%	1900
May	1st to 10th	Night	18% 7% 2 5% 4 3 3 3 6% 8% 41%	3130
	11th to 20th	Night	15% 8% 2 6% 3 4 4 2 5% 8% 44%	2593
	21st to end	Night	13% 8% 3 6% 5% 4 6% 4 5% 9% 38%	2743
June	1st to 10th	Night	9% 5% 2 5% 3 4 5% 5% 6% 9% 48%	1520
	11th to 20th	Night	6% 4 1 3 3 3 3 3 6% 11% 57%	1520
	21st to end	Night	4 2 1 4 3 4 5% 5% 7% 9% 57%	1520
July	1st to 10th	Night	11% 4 2 5% 3 4 4 3 5% 9% 49%	2530
	11th to 20th	Night	5% 3 1 3 3 3 4 3 5% 8% 61%	2576
	21st to end	Night	10% 6% 2 7% 5% 5% 6% 4 7% 9% 40%	3098
August	1st to 10th	Night	4 3 1 3 3 4 5% 4 6% 9% 59%	2881
	11th to 20th	Night	8% 7% 3 6% 4 3 4 4 5% 8% 47%	3100
	21st to end	Night	5% 4 2 4 3 3 4 4 6% 8% 58%	3476
September	1st to 10th	Night	10% 6% 2 5% 3 4 4 3 4 7% 52%	1900
	11th to 20th	Night	8% 6% 2 5% 4 4 4 3 5% 7% 52%	1900
	21st to end	Night	9% 5% 1 5% 3 4 5% 3 6% 7% 52%	2101
October	1st to 10th	Night	6% 4 1 3 3 3 3 3 4 5% 64%	2280
	11th to 20th	Night	13% 6% 1 4 3 2 2 3 4 5% 56%	2280
	21st to end	Night	18% 7% 2 4 3 3 4 3 4 4 48%	2508
November	1st to 10th	Night	11% 6% 2 5% 3 2 3 2 4 6% 56%	2503
	11th to 20th	Night	14% 7% 3 4 3 3 4 3 5% 5% 49%	2600
	21st to end	Night	17% 9% 3 5% 4 2 2 3 3 5% 46%	2635
December	1st to 10th	Night	12% 10% 2 6% 4 4 4 3 4 6% 46%	4580
	11th to 20th	Night	15% 9% 3 7% 4 4 3 3 4 6% 43%	5199
	21st to end	Night	21% 17% 4 8% 4 4 3 3 4 4 26%	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	45% 5% 11% 23% 13% 3	3636
	11th to 20th	Day	38% 4 7% 27% 17% 7%	4080
	21st to end	Day	44% 4 9% 15% 17% 11%	4488
February	1st to 10th	Day	49% 5% 12% 21% 12% 2	1800
	11th to 20th	Day	45% 5% 12% 19% 14% 5%	1949
	21st to end	Day	45% 6% 9% 22% 12% 6%	1570
March	1st to 10th	Day	48% 6% 7% 19% 12% 8%	3216
	11th to 20th	Day	35% 5% 9% 27% 17% 6%	3480
	21st to end	Day	42% 7% 17% 20% 13% 1	3994
April	1st to 10th	Day	37% 6% 11% 25% 20% 2	2280
	11th to 20th	Day	45% 5% 10% 20% 16% 4	2254
	21st to end	Day	47% 6% 11% 21% 14% 1	2280
May	1st to 10th	Day	44% 11% 13% 20% 11% 1	3800
	11th to 20th	Day	44% 8% 12% 24% 12% 1	4293
	21st to end	Day	40% 9% 10% 21% 19% 1	4837
June	1st to 10th	Day	36% 8% 14% 25% 16% 2	2660
	11th to 20th	Day	29% 7% 13% 26% 21% 3	2660
	21st to end	Day	28% 10% 18% 23% 16% 5%	2660
July	1st to 10th	Day	37% 8% 12% 28% 12% 3	4371
	11th to 20th	Day	27% 8% 14% 34% 16% 2	4315
	21st to end	Day	42% 10% 14% 25% 8% 1	4325
August	1st to 10th	Day	25% 8% 15% 31% 20%	4040
	11th to 20th	Day	38% 6% 12% 25% 16% 3	3765
	21st to end	Day	28% 6% 14% 35% 14% 3	4179
September	1st to 10th	Day	32% 7% 13% 26% 17% 5%	2280
	11th to 20th	Day	35% 7% 9% 24% 24% 1	2267
	21st to end	Day	31% 7% 8% 27% 24% 3	2068
October	1st to 10th	Day	17% 4 5% 19% 45% 11%	3160
	11th to 20th	Day	23% 4 5% 21% 37% 10%	3140
	21st to end	Day	30% 4 6% 29% 26% 5%	3428
November	1st to 10th	Day	34% 4 10% 24% 21% 7%	1794
	11th to 20th	Day	36% 5% 8% 22% 21% 7%	1800
	21st to end	Day	45% 3 9% 24% 18% 1	1760
December	1st to 10th	Day	35% 4 8% 37% 15% 1	2610
	11th to 20th	Day	44% 4 8% 24% 18% 2	3005
	21st to end	Day	60% 5% 10% 13% 10% 2	3982
January	1st to 10th	Night	49% 6% 9% 21% 14% 1	6325
	11th to 20th	Night	42% 5% 8% 24% 19% 3	5900
	21st to end	Night	46% 4 8% 20% 19% 4	6490
February	1st to 10th	Night	48% 5% 10% 21% 14% 2	2600
	11th to 20th	Night	44% 4 11% 20% 17% 3	2346
	21st to end	Night	45% 5% 9% 21% 16% 5%	1885
March	1st to 10th	Night	46% 5% 8% 22% 14% 5%	3651
	11th to 20th	Night	36% 7% 11% 23% 18% 5%	3480
	21st to end	Night	42% 9% 14% 26% 9% 1	3636
April	1st to 10th	Night	32% 6% 13% 25% 20% 3	1900
	11th to 20th	Night	40% 6% 10% 23% 17% 5%	1875
	21st to end	Night	44% 5% 10% 24% 15% 2	1900
May	1st to 10th	Night	38% 10% 18% 20% 13% 1	3160
	11th to 20th	Night	38% 9% 13% 22% 16% 1	2594
	21st to end	Night	39% 11% 12% 22% 15% 1	2751
June	1st to 10th	Night	32% 8% 15% 24% 20% 2	1520
	11th to 20th	Night	21% 6% 13% 33% 21% 5%	1520
	21st to end	Night	20% 9% 17% 29% 18% 7%	1520
July	1st to 10th	Night	31% 7% 14% 29% 14% 4	2490
	11th to 20th	Night	22% 6% 13% 38% 20% 3	2528
	21st to end	Night	37% 9% 17% 24% 12% 1	2999
August	1st to 10th	Night	19% 9% 19% 30% 21% 1	2871
	11th to 20th	Night	33% 7% 15% 24% 17% 4	3130
	21st to end	Night	23% 6% 14% 38% 16% 3	3476
September	1st to 10th	Night	30% 8% 9% 27% 20% 6%	1900
	11th to 20th	Night	30% 7% 11% 26% 24% 2	1900
	21st to end	Night	29% 6% 11% 23% 27% 4	2101
October	1st to 10th	Night	14% 3 6% 16% 47% 14%	3800
	11th to 20th	Night	22% 3 7% 20% 34% 14%	3779
	21st to end	Night	30% 4 8% 25% 26% 7%	4120
November	1st to 10th	Night	30% 4 11% 26% 23% 5%	2503
	11th to 20th	Night	35% 4 8% 23% 23% 7%	2600
	21st to end	Night	42% 4 7% 25% 20% 2	2635
December	1st to 10th	Night	39% 5% 8% 30% 17% 1	4580
	11th to 20th	Night	42% 5% 11% 21% 20% 2	5201
	21st to end	Night	58% 7% 10% 17% 7% 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	30% 22% 34% 11% 2	300
	11th to 20th	Day	32% 28% 30% 9% 1	300
	21st to end	Day	22% 34% 31% 12% 1	330
February	1st to 10th	Day	28% 27% 33% 11% 2	300
	11th to 20th	Day	35% 27% 29% 7% 2 1	300
	21st to end	Day	33% 26% 32% 7% 1	225
March	1st to 10th	Day	24% 25% 37% 11% 2	270
	11th to 20th	Day	35% 23% 31% 9% 2	270
	21st to end	Day	30% 25% 34% 10% 3	400
April	1st to 10th	Day	22% 22% 33% 18% 5%	460
	11th to 20th	Day	28% 20% 30% 17% 4 1	452
	21st to end	Day	24% 20% 35% 14% 6% 1	460
May	1st to 10th	Day	21% 19% 34% 20% 5% 1	463
	11th to 20th	Day	19% 15% 29% 22% 13% 2	618
	21st to end	Day	13% 12% 34% 26% 11% 4	734
June	1st to 10th	Day	11% 7% 27% 26% 23% 5%	680
	11th to 20th	Day	6% 4 25% 40% 21% 4	680
	21st to end	Day	5% 7% 35% 31% 18% 5%	680
July	1st to 10th	Day	11% 4 19% 28% 28% 9%	671
	11th to 20th	Day	5% 3 22% 38% 26% 6%	668
	21st to end	Day	9% 4 19% 37% 25% 7%	739
August	1st to 10th	Day	10% 2 18% 39% 24% 7%	652
	11th to 20th	Day	13% 5% 22% 29% 25% 6%	479
	21st to end	Day	10% 2 17% 30% 28% 12%	539
September	1st to 10th	Day	11% 4 21% 33% 23% 8%	490
	11th to 20th	Day	12% 3 19% 30% 26% 10%	490
	21st to end	Day	15% 9% 24% 28% 18% 7%	468
October	1st to 10th	Day	12% 10% 33% 32% 9% 3	300
	11th to 20th	Day	20% 17% 38% 20% 5% 1	300
	21st to end	Day	29% 21% 30% 17% 3	330
November	1st to 10th	Day	18% 15% 38% 21% 7% 1	300
	11th to 20th	Day	22% 22% 30% 18% 7% 1	300
	21st to end	Day	32% 19% 27% 17% 4 1	300
December	1st to 10th	Day	22% 23% 34% 14% 4 2	300
	11th to 20th	Day	29% 24% 28% 16% 3 1	300
	21st to end	Day	33% 24% 32% 9% 2	330
January	1st to 10th	Night	23% 24% 34% 16% 3	1000
	11th to 20th	Night	25% 27% 32% 13% 3	1000
	21st to end	Night	21% 23% 37% 18% 1	1100
February	1st to 10th	Night	26% 20% 35% 17% 1	1000
	11th to 20th	Night	24% 23% 38% 14% 1	790
	21st to end	Night	25% 23% 35% 16% 1	629
March	1st to 10th	Night	26% 18% 36% 19% 2	717
	11th to 20th	Night	23% 17% 34% 23% 3	570
	21st to end	Night	26% 16% 33% 20% 4	627
April	1st to 10th	Night	14% 20% 37% 25% 4	570
	11th to 20th	Night	19% 18% 31% 25% 7% 1	563
	21st to end	Night	22% 13% 37% 21% 6%	570
May	1st to 10th	Night	19% 9% 35% 28% 9%	570
	11th to 20th	Night	20% 8% 30% 27% 13% 2	561
	21st to end	Night	13% 7% 26% 34% 17% 3	617
June	1st to 10th	Night	12% 4 17% 39% 26% 3	570
	11th to 20th	Night	7% 2 22% 46% 21% 1	570
	21st to end	Night	4 3 24% 41% 26% 2	570
July	1st to 10th	Night	10% 2 12% 34% 33% 10%	555
	11th to 20th	Night	6% 1 15% 43% 28% 6%	552
	21st to end	Night	8% 2 14% 41% 32% 3	624
August	1st to 10th	Night	7% 2 14% 39% 34% 5%	567
	11th to 20th	Night	11% 1 17% 37% 31% 3	564
	21st to end	Night	8% 2 15% 33% 36% 7%	627
September	1st to 10th	Night	12% 2 14% 35% 32% 5%	570
	11th to 20th	Night	10% 3 15% 35% 31% 6%	570
	21st to end	Night	12% 7% 25% 27% 26% 4	753
October	1st to 10th	Night	8% 6% 27% 33% 22% 4	760
	11th to 20th	Night	16% 13% 32% 25% 13% 1	760
	21st to end	Night	23% 15% 31% 23% 7%	836
November	1st to 10th	Night	13% 13% 38% 26% 9% 1	780
	11th to 20th	Night	21% 16% 31% 26% 6% 1	800
	21st to end	Night	26% 17% 32% 20% 6%	835
December	1st to 10th	Night	22% 19% 33% 22% 4 1	1000
	11th to 20th	Night	25% 16% 33% 23% 4	1000
	21st to end	Night	29% 19% 32% 18% 2	1100

Page generated at 2025-02-18 02:26:31. Version ac07

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