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 2024-12-02.

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% 3 8% 5% 4 5% 4 6% 7% 36%	101394
	Night	15% 10% 4 8% 5% 4 4 3 5% 6% 36%	98302
Transparency	Day	45% 7% 12% 22% 13% 2	105005
	Night	46% 6% 11% 21% 14% 2	102832
Seeing	Day	17% 10% 27% 25% 16% 6%	15798
	Night	18% 9% 29% 30% 13% 1	25649

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	16% 14% 9% 13% 5% 4 5% 4 6% 5% 19%	2527
	11th to 20th	Day	14% 16% 8% 14% 7% 5% 5% 8% 6% 4 14%	2530
	21st to end	Day	26% 22% 6% 11% 4 3 3 2 2 4 16%	2783
February	1st to 10th	Day	16% 15% 5% 11% 6% 5% 4 3 4 6% 25%	1862
	11th to 20th	Day	15% 12% 4 11% 6% 4 4 3 5% 6% 30%	1848
	21st to end	Day	16% 15% 7% 10% 4 3 4 4 5% 6% 27%	1570
March	1st to 10th	Day	19% 17% 5% 8% 5% 4 4 3 4 5% 28%	3120
	11th to 20th	Day	12% 8% 4 8% 5% 4 5% 4 5% 7% 38%	3319
	21st to end	Day	19% 11% 5% 10% 6% 5% 5% 4 5% 6% 25%	4053
April	1st to 10th	Day	17% 12% 3 8% 4 4 4 4 6% 6% 32%	2280
	11th to 20th	Day	17% 9% 3 7% 5% 4 4 3 6% 6% 36%	2254
	21st to end	Day	20% 9% 3 7% 4 4 4 3 6% 8% 33%	2446
May	1st to 10th	Day	18% 8% 3 6% 5% 5% 5% 5% 6% 9% 30%	4082
	11th to 20th	Day	15% 8% 3 6% 4 4 5% 4 5% 8% 37%	4081
	21st to end	Day	9% 6% 2 6% 4 4 4 4 7% 9% 45%	4780
June	1st to 10th	Day	10% 5% 2 7% 5% 4 4 4 7% 9% 42%	2660
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 6% 9% 45%	2660
	21st to end	Day	11% 5% 2 6% 6% 5% 6% 5% 7% 9% 39%	2660
July	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 4 7% 9% 36%	4440
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 4 7% 11% 46%	4440
	21st to end	Day	9% 6% 3 7% 5% 5% 6% 5% 6% 8% 41%	4813
August	1st to 10th	Day	7% 5% 2 6% 4 5% 5% 4 6% 9% 48%	4116
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 4 7% 9% 46%	3889
	21st to end	Day	7% 4 1 6% 3 4 5% 4 6% 8% 50%	4180
September	1st to 10th	Day	10% 5% 2 6% 4 4 5% 5% 6% 7% 47%	2276
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 4 7% 7% 48%	2090
	21st to end	Day	13% 6% 2 6% 5% 4 5% 4 6% 8% 43%	2090
October	1st to 10th	Day	12% 7% 2 6% 4 3 4 4 6% 6% 45%	2090
	11th to 20th	Day	17% 7% 2 6% 5% 4 4 4 5% 6% 39%	1891
	21st to end	Day	19% 11% 3 7% 5% 4 4 4 6% 7% 30%	1881
November	1st to 10th	Day	12% 8% 3 7% 4 4 4 3 5% 7% 45%	1762
	11th to 20th	Day	18% 12% 3 8% 5% 5% 3 3 5% 7% 32%	1800
	21st to end	Day	18% 13% 3 8% 5% 4 4 3 5% 6% 31%	1800
December	1st to 10th	Day	15% 15% 4 11% 6% 5% 4 2 4 6% 28%	1620
	11th to 20th	Day	14% 16% 5% 13% 5% 5% 4 3 5% 5% 25%	1918
	21st to end	Day	23% 23% 7% 13% 6% 4 4 2 3 3 12%	2783
January	1st to 10th	Night	17% 16% 7% 12% 5% 4 4 3 5% 5% 22%	4428
	11th to 20th	Night	15% 21% 8% 13% 6% 4 5% 3 5% 3 17%	4440
	21st to end	Night	25% 17% 8% 10% 4 4 3 2 4 4 19%	4884
February	1st to 10th	Night	18% 14% 5% 9% 6% 4 3 3 5% 6% 28%	2314
	11th to 20th	Night	14% 12% 4 9% 6% 5% 4 3 5% 6% 34%	2218
	21st to end	Night	21% 13% 4 8% 5% 4 4 3 4 5% 30%	1884
March	1st to 10th	Night	17% 13% 3 6% 4 4 4 3 4 7% 35%	3733
	11th to 20th	Night	11% 7% 3 7% 4 5% 4 3 5% 7% 44%	3640
	21st to end	Night	19% 9% 3 9% 5% 4 4 4 5% 6% 32%	3608
April	1st to 10th	Night	15% 9% 3 6% 5% 4 5% 4 6% 8% 37%	1900
	11th to 20th	Night	19% 8% 2 7% 4 4 3 4 5% 6% 38%	1875
	21st to end	Night	18% 9% 2 7% 4 5% 5% 3 6% 6% 35%	1734
May	1st to 10th	Night	16% 8% 3 8% 5% 5% 5% 3 6% 8% 33%	2813
	11th to 20th	Night	18% 7% 2 6% 4 4 4 3 6% 8% 37%	2812
	21st to end	Night	11% 7% 3 7% 5% 4 5% 3 6% 7% 43%	2782
June	1st to 10th	Night	10% 4 2 6% 4 4 4 3 6% 8% 50%	1520
	11th to 20th	Night	9% 5% 2 5% 4 4 4 5% 5% 8% 48%	1520
	21st to end	Night	10% 5% 2 7% 5% 5% 5% 5% 6% 8% 43%	1520
July	1st to 10th	Night	10% 5% 2 6% 5% 5% 5% 4 6% 8% 45%	2530
	11th to 20th	Night	6% 5% 2 5% 3 3 4 3 7% 7% 55%	2530
	21st to end	Night	6% 5% 3 6% 5% 5% 6% 5% 9% 8% 43%	2750
August	1st to 10th	Night	8% 5% 2 6% 5% 4 5% 4 6% 10% 45%	2811
	11th to 20th	Night	7% 5% 2 5% 4 4 5% 4 6% 7% 51%	2935
	21st to end	Night	9% 4 2 6% 3 4 4 3 5% 8% 52%	3476
September	1st to 10th	Night	11% 4 1 6% 4 4 3 2 5% 7% 52%	1900
	11th to 20th	Night	8% 4 2 4 4 3 4 3 5% 8% 56%	2073
	21st to end	Night	11% 7% 2 6% 3 3 4 3 5% 7% 47%	2090
October	1st to 10th	Night	11% 5% 3 5% 4 4 4 3 5% 6% 51%	2090
	11th to 20th	Night	18% 7% 3 6% 3 3 3 3 4 7% 43%	2286
	21st to end	Night	20% 8% 2 6% 5% 4 4 3 5% 6% 37%	2717
November	1st to 10th	Night	13% 9% 3 6% 4 3 4 3 5% 6% 44%	2536
	11th to 20th	Night	15% 9% 3 8% 5% 4 5% 4 6% 7% 35%	2600
	21st to end	Night	18% 12% 4 9% 4 4 4 4 5% 5% 31%	2600
December	1st to 10th	Night	17% 12% 5% 9% 5% 4 4 3 4 6% 30%	2590
	11th to 20th	Night	16% 15% 6% 11% 5% 4 4 3 4 5% 26%	3279
	21st to end	Night	26% 18% 7% 10% 5% 5% 3 3 4 5% 15%	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% 6% 11% 13% 5%	2528
	11th to 20th	Day	70% 5% 10% 9% 6%	2530
	21st to end	Day	74% 3 7% 11% 4	2783
February	1st to 10th	Day	61% 4 11% 15% 7% 1	1862
	11th to 20th	Day	54% 6% 10% 21% 8% 1	1858
	21st to end	Day	57% 6% 11% 18% 6% 2	1570
March	1st to 10th	Day	59% 5% 10% 18% 8% 1	3120
	11th to 20th	Day	44% 6% 12% 28% 9% 1	3319
	21st to end	Day	58% 8% 14% 16% 3	4053
April	1st to 10th	Day	51% 5% 11% 20% 12%	2280
	11th to 20th	Day	47% 7% 10% 23% 11% 3	2254
	21st to end	Day	50% 5% 12% 19% 11% 2	2446
May	1st to 10th	Day	48% 9% 12% 24% 7%	4120
	11th to 20th	Day	43% 8% 14% 25% 9% 1	4085
	21st to end	Day	33% 8% 12% 24% 22% 2	4793
June	1st to 10th	Day	36% 7% 12% 25% 16% 3	2660
	11th to 20th	Day	35% 8% 10% 24% 20% 4	2660
	21st to end	Day	40% 9% 15% 19% 15% 3	2660
July	1st to 10th	Day	43% 7% 13% 20% 14% 3	4371
	11th to 20th	Day	29% 7% 16% 30% 17% 1	4365
	21st to end	Day	39% 8% 14% 17% 19% 3	4662
August	1st to 10th	Day	32% 8% 15% 28% 15% 1	4102
	11th to 20th	Day	32% 9% 13% 29% 17% 1	3928
	21st to end	Day	30% 7% 14% 26% 20% 4	4179
September	1st to 10th	Day	34% 6% 14% 23% 18% 4	2276
	11th to 20th	Day	33% 5% 12% 25% 21% 3	2090
	21st to end	Day	38% 6% 11% 23% 19% 2	2090
October	1st to 10th	Day	27% 4 9% 33% 26% 2	3480
	11th to 20th	Day	35% 6% 11% 21% 27%	3120
	21st to end	Day	44% 5% 9% 28% 12% 2	3081
November	1st to 10th	Day	40% 5% 14% 24% 15% 2	1762
	11th to 20th	Day	52% 5% 11% 19% 12% 2	1800
	21st to end	Day	55% 5% 11% 21% 7% 1	1800
December	1st to 10th	Day	59% 4 12% 17% 7%	1620
	11th to 20th	Day	61% 6% 9% 21% 3	1915
	21st to end	Day	79% 4 7% 7% 3	2783
January	1st to 10th	Night	63% 6% 11% 14% 6%	4428
	11th to 20th	Night	71% 4 9% 11% 5%	4440
	21st to end	Night	70% 4 9% 13% 5%	4884
February	1st to 10th	Night	59% 5% 11% 16% 8% 2	2314
	11th to 20th	Night	52% 5% 11% 21% 11% 1	2219
	21st to end	Night	56% 6% 10% 16% 10% 2	1884
March	1st to 10th	Night	50% 5% 12% 24% 9% 1	3733
	11th to 20th	Night	38% 6% 11% 26% 16% 2	3640
	21st to end	Night	52% 6% 14% 21% 6% 1	3608
April	1st to 10th	Night	44% 7% 12% 21% 15% 2	1900
	11th to 20th	Night	46% 6% 9% 21% 16% 3	1875
	21st to end	Night	46% 7% 9% 21% 13% 3	1734
May	1st to 10th	Night	48% 6% 10% 23% 11% 1	2840
	11th to 20th	Night	43% 7% 14% 26% 10% 1	2813
	21st to end	Night	38% 7% 10% 19% 22% 4	2790
June	1st to 10th	Night	31% 8% 11% 27% 20% 3	1520
	11th to 20th	Night	33% 8% 11% 24% 20% 4	1520
	21st to end	Night	38% 8% 15% 20% 16% 3	1520
July	1st to 10th	Night	36% 7% 14% 26% 12% 6%	2490
	11th to 20th	Night	26% 6% 14% 26% 26% 2	2482
	21st to end	Night	34% 8% 15% 18% 20% 4	2662
August	1st to 10th	Night	33% 8% 16% 28% 15% 1	2801
	11th to 20th	Night	30% 8% 12% 30% 19% 1	2962
	21st to end	Night	31% 6% 11% 28% 21% 3	3476
September	1st to 10th	Night	32% 6% 13% 25% 19% 6%	1900
	11th to 20th	Night	27% 5% 9% 28% 27% 3	2073
	21st to end	Night	36% 6% 10% 25% 21% 3	2090
October	1st to 10th	Night	22% 4 8% 33% 31% 1	3480
	11th to 20th	Night	36% 4 7% 23% 29% 1	3796
	21st to end	Night	38% 5% 9% 26% 21% 2	4467
November	1st to 10th	Night	41% 6% 10% 24% 18% 2	2536
	11th to 20th	Night	47% 6% 10% 21% 14% 2	2600
	21st to end	Night	55% 4 10% 22% 9%	2600
December	1st to 10th	Night	55% 6% 12% 18% 8% 1	2590
	11th to 20th	Night	59% 5% 12% 17% 6% 1	3281
	21st to end	Night	73% 5% 9% 9% 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	24% 15% 35% 20% 6% 1	270
	11th to 20th	Day	24% 14% 38% 18% 4 1	270
	21st to end	Day	28% 14% 33% 19% 6%	297
February	1st to 10th	Day	24% 16% 37% 18% 5%	270
	11th to 20th	Day	26% 16% 35% 20% 4	270
	21st to end	Day	24% 18% 41% 14% 4	225
March	1st to 10th	Day	24% 17% 37% 20% 3	270
	11th to 20th	Day	23% 18% 31% 21% 6% 1	364
	21st to end	Day	30% 13% 30% 19% 6% 1	506
April	1st to 10th	Day	22% 12% 34% 22% 8% 2	460
	11th to 20th	Day	21% 17% 31% 18% 10% 3	452
	21st to end	Day	25% 13% 33% 19% 8% 2	460
May	1st to 10th	Day	22% 13% 29% 24% 9% 4	463
	11th to 20th	Day	20% 8% 29% 23% 14% 5%	487
	21st to end	Day	11% 6% 29% 28% 18% 9%	703
June	1st to 10th	Day	11% 9% 26% 28% 21% 5%	680
	11th to 20th	Day	10% 6% 26% 31% 21% 5%	680
	21st to end	Day	12% 6% 30% 27% 18% 7%	680
July	1st to 10th	Day	11% 4 18% 28% 22% 17%	671
	11th to 20th	Day	7% 4 22% 31% 23% 12%	668
	21st to end	Day	10% 4 18% 32% 27% 10%	739
August	1st to 10th	Day	7% 4 14% 28% 31% 16%	498
	11th to 20th	Day	10% 3 19% 29% 28% 12%	479
	21st to end	Day	8% 2 12% 33% 32% 13%	539
September	1st to 10th	Day	12% 6% 17% 27% 28% 10%	490
	11th to 20th	Day	11% 3 14% 27% 28% 16%	490
	21st to end	Day	15% 8% 22% 23% 24% 7%	490
October	1st to 10th	Day	13% 6% 27% 28% 19% 7%	490
	11th to 20th	Day	16% 19% 24% 29% 11% 1	367
	21st to end	Day	28% 12% 34% 20% 4 1	330
November	1st to 10th	Day	12% 13% 36% 24% 10% 4	300
	11th to 20th	Day	25% 17% 32% 18% 8% 1	300
	21st to end	Day	27% 13% 38% 18% 4	300
December	1st to 10th	Day	21% 20% 34% 18% 7%	273
	11th to 20th	Day	22% 15% 39% 16% 7% 1	270
	21st to end	Day	28% 20% 35% 14% 2	297
January	1st to 10th	Night	23% 16% 35% 21% 5%	950
	11th to 20th	Night	23% 15% 36% 21% 4	950
	21st to end	Night	23% 11% 35% 26% 4	1045
February	1st to 10th	Night	25% 9% 37% 25% 3	779
	11th to 20th	Night	20% 13% 36% 26% 4	743
	21st to end	Night	27% 14% 36% 20% 3	628
March	1st to 10th	Night	21% 12% 36% 25% 5%	760
	11th to 20th	Night	18% 9% 39% 27% 6%	760
	21st to end	Night	24% 10% 34% 26% 6%	717
April	1st to 10th	Night	18% 12% 39% 23% 7% 1	570
	11th to 20th	Night	23% 10% 35% 25% 7% 1	563
	21st to end	Night	21% 8% 36% 24% 10%	570
May	1st to 10th	Night	20% 7% 34% 30% 9%	570
	11th to 20th	Night	19% 6% 26% 33% 15% 1	561
	21st to end	Night	12% 3 25% 39% 19% 1	617
June	1st to 10th	Night	11% 4 22% 46% 16%	570
	11th to 20th	Night	9% 2 29% 39% 19% 1	570
	21st to end	Night	11% 3 24% 37% 25% 1	570
July	1st to 10th	Night	8% 2 13% 43% 29% 5%	555
	11th to 20th	Night	11% 2 15% 40% 29% 4	552
	21st to end	Night	7% 1 15% 44% 31% 2	624
August	1st to 10th	Night	7% 2 9% 47% 31% 4	567
	11th to 20th	Night	8% 1 12% 43% 32% 4	564
	21st to end	Night	9% 2 13% 35% 37% 4	627
September	1st to 10th	Night	12% 3 16% 38% 27% 4	570
	11th to 20th	Night	9% 4 15% 38% 30% 4	743
	21st to end	Night	14% 6% 21% 33% 23% 3	760
October	1st to 10th	Night	12% 6% 23% 36% 20% 2	760
	11th to 20th	Night	20% 13% 27% 31% 9%	760
	21st to end	Night	24% 11% 31% 26% 7%	836
November	1st to 10th	Night	17% 11% 35% 26% 10% 1	780
	11th to 20th	Night	21% 16% 32% 25% 6% 1	800
	21st to end	Night	23% 13% 34% 23% 7%	800
December	1st to 10th	Night	22% 16% 35% 24% 4	863
	11th to 20th	Night	24% 12% 33% 25% 5%	950
	21st to end	Night	31% 13% 32% 21% 4	1045

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