Tippecanoe River State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tippecanoe River State Park clear sky chart from 2005-11-06 to 2026-03-03.

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	13% 9% 4 8% 5% 5% 5% 4 6% 7% 35%	130601
	Night	14% 10% 4 8% 5% 4 4 3 5% 6% 35%	130813
Transparency	Day	46% 6% 12% 22% 13% 1	134167
	Night	47% 5% 11% 21% 14% 2	135322
Seeing	Day	17% 10% 27% 24% 16% 6%	17449
	Night	18% 9% 29% 30% 13% 1	27415

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% 14% 7% 13% 5% 5% 5% 4 6% 7% 21%	4691
	11th to 20th	Day	10% 14% 8% 14% 7% 7% 6% 5% 5% 4 20%	4710
	21st to end	Day	17% 16% 5% 11% 6% 4 4 4 4 6% 23%	5156
February	1st to 10th	Day	16% 15% 6% 12% 6% 5% 4 3 5% 6% 24%	2059
	11th to 20th	Day	15% 13% 4 11% 6% 4 4 3 5% 6% 30%	2048
	21st to end	Day	15% 14% 6% 10% 4 3 4 4 5% 6% 28%	1730
March	1st to 10th	Day	19% 14% 5% 10% 4 3 3 2 3 4 32%	4500
	11th to 20th	Day	10% 9% 4 7% 4 4 5% 4 5% 7% 41%	4749
	21st to end	Day	18% 14% 6% 11% 6% 5% 5% 4 5% 6% 22%	5799
April	1st to 10th	Day	18% 12% 4 8% 5% 4 4 3 6% 6% 31%	2400
	11th to 20th	Day	17% 10% 3 7% 5% 4 5% 3 5% 6% 35%	2374
	21st to end	Day	19% 9% 3 7% 4 4 4 3 6% 8% 33%	2575
May	1st to 10th	Day	19% 8% 3 7% 5% 5% 5% 4 6% 8% 30%	5862
	11th to 20th	Day	15% 7% 3 6% 5% 5% 5% 4 5% 8% 37%	5861
	21st to end	Day	13% 7% 3 6% 4 4 4 4 6% 9% 40%	6877
June	1st to 10th	Day	11% 5% 2 7% 5% 4 4 4 6% 9% 43%	2800
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 6% 9% 43%	2800
	21st to end	Day	10% 5% 2 6% 6% 5% 6% 5% 7% 9% 40%	2800
July	1st to 10th	Day	10% 5% 3 6% 5% 5% 5% 4 8% 10% 38%	6360
	11th to 20th	Day	8% 5% 2 7% 5% 5% 6% 4 7% 11% 40%	6360
	21st to end	Day	11% 6% 3 7% 5% 5% 5% 5% 6% 8% 39%	6924
August	1st to 10th	Day	7% 5% 2 6% 4 5% 5% 4 6% 9% 48%	4246
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 4 7% 8% 45%	4014
	21st to end	Day	7% 4 1 5% 3 4 5% 4 6% 9% 50%	4312
September	1st to 10th	Day	9% 4 2 6% 4 4 5% 5% 6% 7% 48%	2396
	11th to 20th	Day	10% 4 2 5% 4 4 5% 4 7% 7% 49%	2200
	21st to end	Day	12% 6% 2 6% 5% 4 5% 3 6% 8% 43%	2200
October	1st to 10th	Day	12% 6% 2 6% 4 3 4 4 6% 7% 46%	2200
	11th to 20th	Day	17% 7% 2 6% 5% 4 4 4 6% 6% 39%	1990
	21st to end	Day	19% 10% 3 6% 4 4 4 4 6% 7% 31%	1980
November	1st to 10th	Day	11% 8% 2 7% 4 4 4 3 5% 7% 45%	1852
	11th to 20th	Day	18% 12% 3 8% 4 4 3 3 4 7% 32%	1890
	21st to end	Day	18% 13% 4 8% 4 4 4 3 5% 6% 31%	1890
December	1st to 10th	Day	11% 13% 3 9% 5% 4 4 3 5% 7% 36%	2838
	11th to 20th	Day	14% 16% 7% 13% 5% 5% 4 3 5% 5% 23%	3088
	21st to end	Day	28% 20% 6% 13% 5% 4 4 2 3 4 10%	4070
January	1st to 10th	Night	14% 14% 7% 14% 6% 5% 5% 4 5% 6% 21%	8232
	11th to 20th	Night	11% 18% 7% 14% 8% 5% 5% 3 5% 4 20%	8280
	21st to end	Night	18% 13% 6% 9% 4 5% 4 3 5% 5% 27%	9058
February	1st to 10th	Night	17% 13% 5% 10% 6% 4 4 3 5% 6% 28%	2556
	11th to 20th	Night	14% 12% 4 9% 5% 5% 4 3 4 6% 34%	2458
	21st to end	Night	19% 13% 4 9% 5% 4 4 3 4 5% 32%	2076
March	1st to 10th	Night	17% 12% 4 7% 4 4 4 3 4 6% 37%	5398
	11th to 20th	Night	12% 7% 3 6% 4 4 5% 3 5% 7% 43%	5210
	21st to end	Night	18% 10% 3 8% 5% 4 4 4 5% 6% 33%	5160
April	1st to 10th	Night	15% 9% 3 6% 5% 4 4 4 6% 8% 37%	2000
	11th to 20th	Night	19% 8% 2 6% 4 4 3 4 5% 6% 38%	1975
	21st to end	Night	17% 9% 3 7% 4 5% 5% 3 6% 6% 36%	1825
May	1st to 10th	Night	19% 11% 4 8% 5% 4 4 3 5% 6% 32%	4033
	11th to 20th	Night	15% 7% 2 6% 4 4 4 3 6% 8% 39%	4032
	21st to end	Night	14% 9% 3 7% 4 4 4 3 5% 7% 39%	3994
June	1st to 10th	Night	11% 4 2 6% 4 4 4 3 6% 8% 50%	1600
	11th to 20th	Night	9% 6% 2 5% 4 4 4 4 6% 8% 47%	1600
	21st to end	Night	10% 5% 2 7% 5% 4 5% 5% 6% 8% 44%	1600
July	1st to 10th	Night	8% 5% 2 6% 5% 4 5% 4 6% 10% 45%	3618
	11th to 20th	Night	6% 6% 2 6% 4 4 5% 4 8% 8% 47%	3617
	21st to end	Night	9% 6% 3 7% 5% 5% 5% 4 7% 8% 41%	3947
August	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 6% 10% 46%	2900
	11th to 20th	Night	7% 5% 2 5% 4 4 4 4 6% 7% 51%	3030
	21st to end	Night	9% 4 2 5% 3 4 4 3 5% 8% 52%	3586
September	1st to 10th	Night	11% 4 2 6% 4 4 3 2 5% 7% 53%	2000
	11th to 20th	Night	8% 4 2 4 4 3 4 3 5% 8% 57%	2182
	21st to end	Night	11% 7% 2 7% 3 3 4 3 5% 7% 48%	2200
October	1st to 10th	Night	11% 5% 2 5% 4 4 4 3 5% 6% 52%	2200
	11th to 20th	Night	17% 7% 3 7% 3 3 3 3 5% 7% 43%	2407
	21st to end	Night	19% 8% 2 6% 5% 4 4 3 5% 6% 38%	2860
November	1st to 10th	Night	12% 9% 3 7% 4 3 4 3 5% 6% 44%	2666
	11th to 20th	Night	15% 8% 3 8% 5% 4 4 4 5% 7% 36%	2730
	21st to end	Night	19% 12% 4 9% 4 4 4 3 4 5% 31%	2730
December	1st to 10th	Night	13% 9% 4 7% 4 4 4 3 5% 7% 39%	4564
	11th to 20th	Night	17% 15% 6% 10% 6% 5% 5% 3 4 4 24%	5339
	21st to end	Night	26% 17% 6% 10% 5% 5% 4 4 4 5% 14%	7150

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	61% 6% 14% 15% 4	4692
	11th to 20th	Day	67% 4 8% 10% 9% 2	4710
	21st to end	Day	63% 4 12% 15% 6%	5156
February	1st to 10th	Day	61% 4 12% 15% 7% 1	2059
	11th to 20th	Day	55% 6% 9% 22% 8% 1	2058
	21st to end	Day	56% 6% 12% 18% 6% 1	1730
March	1st to 10th	Day	56% 4 8% 22% 9% 1	4500
	11th to 20th	Day	42% 5% 11% 33% 9% 1	4749
	21st to end	Day	61% 7% 12% 14% 5% 1	5801
April	1st to 10th	Day	52% 5% 11% 20% 11%	2400
	11th to 20th	Day	48% 7% 10% 22% 10% 3	2374
	21st to end	Day	49% 5% 13% 20% 11% 2	2575
May	1st to 10th	Day	50% 8% 11% 20% 11% 1	5897
	11th to 20th	Day	45% 7% 12% 22% 12% 1	5865
	21st to end	Day	39% 7% 11% 26% 16% 1	6891
June	1st to 10th	Day	36% 7% 12% 25% 16% 3	2800
	11th to 20th	Day	36% 8% 10% 24% 19% 3	2800
	21st to end	Day	39% 9% 15% 20% 15% 3	2800
July	1st to 10th	Day	38% 7% 12% 25% 16% 2	6291
	11th to 20th	Day	35% 8% 15% 27% 14% 1	6285
	21st to end	Day	41% 7% 12% 23% 15% 2	6728
August	1st to 10th	Day	31% 8% 15% 29% 15% 1	4232
	11th to 20th	Day	32% 9% 13% 29% 17% 1	4053
	21st to end	Day	30% 7% 14% 27% 20% 4	4311
September	1st to 10th	Day	34% 6% 14% 24% 18% 3	2396
	11th to 20th	Day	32% 5% 12% 26% 22% 3	2200
	21st to end	Day	38% 6% 11% 23% 20% 2	2200
October	1st to 10th	Day	27% 4 9% 33% 26% 2	3590
	11th to 20th	Day	35% 6% 10% 22% 26%	3219
	21st to end	Day	43% 5% 9% 28% 13% 2	3180
November	1st to 10th	Day	40% 5% 13% 25% 15% 2	1852
	11th to 20th	Day	52% 5% 10% 20% 11% 1	1890
	21st to end	Day	55% 5% 11% 21% 7% 1	1890
December	1st to 10th	Day	48% 5% 16% 25% 7%	2838
	11th to 20th	Day	62% 5% 12% 17% 4	3085
	21st to end	Day	79% 4 7% 7% 3	4070
January	1st to 10th	Night	62% 5% 10% 16% 6%	8233
	11th to 20th	Night	67% 4 9% 10% 9% 1	8280
	21st to end	Night	59% 4 10% 18% 8%	9058
February	1st to 10th	Night	59% 5% 11% 17% 8% 2	2556
	11th to 20th	Night	53% 4 10% 21% 10% 1	2459
	21st to end	Night	55% 5% 12% 16% 10% 2	2076
March	1st to 10th	Night	49% 4 9% 26% 10% 1	5398
	11th to 20th	Night	40% 5% 13% 27% 14% 2	5210
	21st to end	Night	51% 5% 12% 22% 9% 1	5160
April	1st to 10th	Night	44% 6% 12% 21% 15% 2	2000
	11th to 20th	Night	46% 6% 9% 21% 16% 3	1975
	21st to end	Night	46% 7% 9% 23% 13% 3	1825
May	1st to 10th	Night	53% 5% 8% 18% 13% 3	4060
	11th to 20th	Night	41% 6% 12% 26% 13% 1	4033
	21st to end	Night	44% 6% 9% 20% 18% 2	4002
June	1st to 10th	Night	31% 8% 11% 27% 20% 3	1600
	11th to 20th	Night	33% 8% 11% 25% 19% 4	1600
	21st to end	Night	37% 8% 16% 20% 17% 3	1600
July	1st to 10th	Night	34% 6% 11% 30% 14% 4	3580
	11th to 20th	Night	31% 7% 16% 23% 21% 1	3572
	21st to end	Night	37% 8% 15% 20% 17% 3	3832
August	1st to 10th	Night	32% 8% 16% 29% 15% 1	2890
	11th to 20th	Night	30% 8% 12% 30% 19% 1	3057
	21st to end	Night	31% 6% 11% 28% 22% 3	3586
September	1st to 10th	Night	32% 6% 12% 26% 19% 6%	2000
	11th to 20th	Night	26% 5% 9% 28% 28% 3	2182
	21st to end	Night	36% 6% 10% 24% 22% 3	2200
October	1st to 10th	Night	22% 4 8% 33% 31% 1	3590
	11th to 20th	Night	36% 4 7% 23% 28% 1	3917
	21st to end	Night	38% 5% 9% 27% 21% 2	4610
November	1st to 10th	Night	41% 6% 10% 23% 18% 2	2666
	11th to 20th	Night	47% 6% 11% 22% 14% 2	2730
	21st to end	Night	56% 4 9% 22% 8%	2730
December	1st to 10th	Night	44% 5% 14% 26% 9% 1	4564
	11th to 20th	Night	62% 5% 12% 13% 7% 1	5341
	21st to end	Night	73% 5% 9% 10% 3	7150

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	24% 15% 36% 19% 5% 1	330
	11th to 20th	Day	22% 19% 37% 17% 4 1	330
	21st to end	Day	25% 18% 33% 18% 5%	363
February	1st to 10th	Day	22% 16% 37% 18% 5% 1	330
	11th to 20th	Day	25% 16% 36% 19% 3	330
	21st to end	Day	22% 19% 41% 14% 3	273
March	1st to 10th	Day	23% 17% 40% 18% 2	306
	11th to 20th	Day	23% 19% 31% 21% 6% 1	399
	21st to end	Day	30% 14% 31% 18% 6% 1	550
April	1st to 10th	Day	24% 12% 34% 21% 7% 2	500
	11th to 20th	Day	21% 18% 31% 17% 10% 3	492
	21st to end	Day	24% 12% 33% 19% 9% 2	500
May	1st to 10th	Day	22% 13% 29% 23% 9% 4	503
	11th to 20th	Day	19% 9% 28% 24% 14% 6%	527
	21st to end	Day	12% 6% 30% 27% 17% 8%	757
June	1st to 10th	Day	11% 9% 26% 28% 21% 5%	730
	11th to 20th	Day	11% 6% 25% 32% 21% 5%	730
	21st to end	Day	12% 6% 29% 28% 18% 7%	730
July	1st to 10th	Day	11% 4 18% 29% 23% 16%	721
	11th to 20th	Day	8% 5% 21% 31% 23% 12%	718
	21st to end	Day	10% 4 17% 32% 27% 10%	794
August	1st to 10th	Day	7% 4 13% 29% 32% 16%	538
	11th to 20th	Day	11% 3 18% 29% 28% 12%	519
	21st to end	Day	8% 3 13% 33% 32% 13%	583
September	1st to 10th	Day	11% 6% 18% 26% 28% 11%	530
	11th to 20th	Day	11% 2 14% 27% 29% 18%	530
	21st to end	Day	15% 8% 22% 23% 24% 8%	530
October	1st to 10th	Day	13% 5% 26% 28% 20% 7%	530
	11th to 20th	Day	16% 18% 24% 30% 11% 1	400
	21st to end	Day	28% 12% 34% 21% 3 1	363
November	1st to 10th	Day	13% 15% 35% 24% 10% 4	330
	11th to 20th	Day	25% 18% 31% 18% 7% 1	330
	21st to end	Day	27% 15% 38% 17% 4	330
December	1st to 10th	Day	20% 19% 35% 19% 7%	330
	11th to 20th	Day	22% 17% 37% 16% 7% 1	330
	21st to end	Day	30% 18% 36% 14% 2	363
January	1st to 10th	Night	23% 15% 35% 21% 5%	1050
	11th to 20th	Night	22% 17% 37% 20% 4	1050
	21st to end	Night	23% 12% 37% 25% 4	1155
February	1st to 10th	Night	24% 10% 37% 26% 3	860
	11th to 20th	Night	21% 13% 38% 25% 4	823
	21st to end	Night	25% 15% 37% 21% 2	692
March	1st to 10th	Night	22% 12% 37% 24% 5%	809
	11th to 20th	Night	18% 10% 39% 26% 6%	800
	21st to end	Night	24% 11% 34% 25% 5%	754
April	1st to 10th	Night	19% 12% 39% 24% 7% 1	600
	11th to 20th	Night	22% 10% 34% 26% 7% 1	593
	21st to end	Night	21% 8% 35% 26% 10%	600
May	1st to 10th	Night	20% 8% 33% 30% 10%	600
	11th to 20th	Night	18% 7% 27% 32% 15% 1	591
	21st to end	Night	13% 4 26% 38% 18% 1	650
June	1st to 10th	Night	11% 5% 22% 46% 16%	600
	11th to 20th	Night	10% 2 29% 40% 19% 1	600
	21st to end	Night	10% 3 24% 37% 25% 1	600
July	1st to 10th	Night	8% 2 13% 43% 29% 5%	585
	11th to 20th	Night	10% 2 14% 41% 29% 4	582
	21st to end	Night	7% 1 15% 44% 31% 2	657
August	1st to 10th	Night	7% 2 9% 46% 32% 4	597
	11th to 20th	Night	8% 1 12% 43% 32% 4	594
	21st to end	Night	9% 2 13% 36% 36% 3	660
September	1st to 10th	Night	12% 3 17% 37% 28% 4	600
	11th to 20th	Night	9% 4 14% 38% 31% 4	782
	21st to end	Night	14% 5% 21% 33% 24% 3	800
October	1st to 10th	Night	12% 6% 22% 37% 21% 2	800
	11th to 20th	Night	19% 13% 27% 32% 9%	800
	21st to end	Night	23% 12% 32% 27% 7%	880
November	1st to 10th	Night	17% 11% 36% 25% 10% 1	820
	11th to 20th	Night	20% 16% 33% 25% 6%	840
	21st to end	Night	24% 13% 33% 23% 7%	840
December	1st to 10th	Night	22% 16% 35% 23% 4	946
	11th to 20th	Night	24% 13% 34% 24% 5%	1050
	21st to end	Night	31% 13% 31% 21% 3	1155

Page generated at 2026-02-28 01:40:26. Version ac07

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