Fall Creek Falls State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fall Creek Falls State Park clear sky chart from 2005-11-06 to 2024-03-28.

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% 8% 4 7% 6% 3 5% 5% 6% 7% 36%	79179
	Night	13% 8% 4 6% 5% 3 4 4 5% 7% 40%	80830
Transparency	Day	45% 6% 10% 20% 15% 3	78902
	Night	43% 5% 10% 21% 17% 4	80626
Seeing	Day	19% 13% 24% 21% 16% 8%	13794
	Night	17% 11% 22% 28% 19% 4	23945

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% 12% 6% 8% 7% 3 5% 6% 5% 5% 29%	2836
	11th to 20th	Day	19% 9% 5% 13% 6% 2 4 3 3 4 31%	2840
	21st to end	Day	20% 12% 7% 7% 4 2 4 3 4 5% 32%	3284
February	1st to 10th	Day	18% 10% 5% 7% 6% 3 4 3 4 5% 34%	1900
	11th to 20th	Day	19% 10% 6% 7% 5% 3 4 3 4 6% 33%	1848
	21st to end	Day	20% 9% 4 8% 5% 3 4 4 4 6% 33%	1570
March	1st to 10th	Day	14% 10% 4 6% 5% 3 4 4 5% 8% 36%	1900
	11th to 20th	Day	18% 9% 4 8% 5% 3 4 4 5% 5% 34%	2072
	21st to end	Day	14% 12% 4 7% 6% 3 6% 4 5% 7% 32%	2255
April	1st to 10th	Day	11% 7% 3 5% 5% 3 6% 5% 6% 6% 42%	2155
	11th to 20th	Day	14% 9% 4 4 6% 3 3 4 4 6% 43%	2134
	21st to end	Day	13% 8% 3 7% 6% 3 5% 5% 6% 7% 39%	2272
May	1st to 10th	Day	12% 7% 3 6% 6% 3 4 5% 6% 8% 40%	2340
	11th to 20th	Day	13% 8% 3 7% 7% 4 5% 5% 5% 7% 35%	2301
	21st to end	Day	9% 7% 3 7% 6% 5% 6% 6% 6% 9% 36%	2531
June	1st to 10th	Day	9% 5% 3 6% 7% 5% 6% 6% 6% 9% 37%	2340
	11th to 20th	Day	5% 5% 2 6% 6% 4 8% 6% 7% 10% 41%	2340
	21st to end	Day	7% 5% 3 5% 7% 4 6% 7% 9% 10% 37%	2340
July	1st to 10th	Day	10% 6% 3 8% 8% 5% 8% 7% 8% 9% 29%	2340
	11th to 20th	Day	12% 6% 3 6% 8% 4 7% 8% 7% 10% 29%	2340
	21st to end	Day	9% 5% 3 7% 8% 5% 8% 9% 7% 9% 29%	2547
August	1st to 10th	Day	9% 7% 3 6% 8% 5% 8% 8% 9% 10% 28%	2326
	11th to 20th	Day	10% 6% 3 8% 8% 5% 7% 6% 7% 9% 31%	2125
	21st to end	Day	11% 7% 4 7% 7% 5% 8% 8% 6% 8% 29%	2376
September	1st to 10th	Day	12% 6% 3 7% 7% 4 7% 6% 6% 7% 35%	2062
	11th to 20th	Day	13% 7% 2 6% 7% 4 4 4 5% 8% 39%	1980
	21st to end	Day	12% 4 2 6% 5% 3 5% 5% 5% 7% 45%	1980
October	1st to 10th	Day	11% 6% 2 4 4 4 3 4 5% 5% 51%	1980
	11th to 20th	Day	13% 6% 2 5% 4 2 4 4 5% 6% 51%	1922
	21st to end	Day	14% 7% 2 4 4 3 4 4 5% 6% 47%	1864
November	1st to 10th	Day	11% 5% 2 4 4 3 3 4 4 5% 55%	1672
	11th to 20th	Day	12% 9% 3 6% 4 2 4 4 5% 6% 46%	1710
	21st to end	Day	14% 8% 3 6% 5% 3 4 4 4 7% 42%	1710
December	1st to 10th	Day	18% 11% 5% 8% 5% 2 4 4 5% 5% 33%	1710
	11th to 20th	Day	12% 12% 4 7% 6% 4 5% 5% 5% 5% 34%	2153
	21st to end	Day	15% 11% 7% 6% 5% 3 5% 4 6% 7% 30%	3124
January	1st to 10th	Night	16% 13% 6% 8% 6% 3 3 4 4 4 34%	4109
	11th to 20th	Night	19% 11% 5% 7% 6% 4 4 3 4 4 34%	4120
	21st to end	Night	19% 14% 6% 6% 4 2 3 3 4 4 33%	4369
February	1st to 10th	Night	16% 8% 5% 8% 6% 2 4 4 5% 6% 35%	2280
	11th to 20th	Night	21% 10% 5% 7% 6% 3 4 4 4 4 33%	2218
	21st to end	Night	22% 10% 5% 6% 5% 3 4 4 5% 5% 31%	1884
March	1st to 10th	Night	16% 9% 4 5% 5% 3 5% 4 5% 6% 38%	2280
	11th to 20th	Night	15% 10% 3 7% 6% 3 4 4 5% 6% 37%	2106
	21st to end	Night	13% 9% 5% 6% 6% 3 6% 4 5% 7% 37%	2256
April	1st to 10th	Night	11% 6% 3 5% 4 2 6% 4 5% 7% 47%	1818
	11th to 20th	Night	12% 8% 2 4 4 2 4 3 5% 7% 48%	1775
	21st to end	Night	12% 6% 2 4 5% 3 4 4 6% 8% 44%	1688
May	1st to 10th	Night	11% 6% 3 5% 5% 3 5% 4 6% 8% 45%	1620
	11th to 20th	Night	12% 5% 3 5% 4 3 6% 5% 5% 9% 43%	1592
	21st to end	Night	6% 6% 2 6% 6% 4 6% 6% 7% 10% 41%	1744
June	1st to 10th	Night	6% 5% 3 7% 6% 4 6% 6% 6% 9% 42%	1620
	11th to 20th	Night	4 3 2 3 4 4 5% 6% 7% 13% 52%	1620
	21st to end	Night	5% 4 2 5% 5% 4 6% 6% 7% 12% 44%	1620
July	1st to 10th	Night	8% 5% 3 6% 6% 4 5% 7% 9% 9% 37%	1620
	11th to 20th	Night	8% 3 2 6% 5% 4 5% 6% 8% 11% 44%	1620
	21st to end	Night	7% 4 2 6% 5% 4 7% 7% 8% 12% 37%	1771
August	1st to 10th	Night	4 6% 2 6% 5% 3 6% 6% 7% 12% 42%	1611
	11th to 20th	Night	7% 5% 3 6% 6% 4 6% 6% 6% 9% 42%	1773
	21st to end	Night	9% 5% 2 4 5% 4 5% 6% 8% 11% 40%	1980
September	1st to 10th	Night	11% 5% 3 5% 5% 3 5% 4 6% 7% 46%	1880
	11th to 20th	Night	10% 7% 3 5% 6% 3 4 4 6% 7% 44%	1980
	21st to end	Night	8% 5% 2 6% 5% 2 3 3 5% 5% 54%	1980
October	1st to 10th	Night	11% 4 2 4 4 2 2 3 4 6% 59%	1980
	11th to 20th	Night	14% 5% 2 5% 4 3 4 4 5% 4 51%	2038
	21st to end	Night	13% 8% 2 4 4 2 3 4 4 5% 50%	2488
November	1st to 10th	Night	11% 6% 2 5% 5% 2 3 3 5% 6% 52%	2406
	11th to 20th	Night	12% 9% 3 5% 4 2 3 4 5% 6% 47%	2470
	21st to end	Night	14% 9% 4 7% 4 2 4 4 5% 5% 42%	2470
December	1st to 10th	Night	19% 10% 6% 7% 5% 3 4 4 5% 5% 31%	2470
	11th to 20th	Night	15% 8% 7% 7% 6% 3 4 4 4 5% 38%	3042
	21st to end	Night	14% 12% 8% 9% 6% 4 6% 5% 5% 6% 25%	4532

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	53% 4 6% 20% 15% 2	2837
	11th to 20th	Day	56% 3 6% 14% 20% 1	2840
	21st to end	Day	54% 3 8% 21% 13% 1	3284
February	1st to 10th	Day	54% 3 7% 16% 17% 2	1900
	11th to 20th	Day	54% 4 7% 17% 15% 4	1858
	21st to end	Day	52% 4 8% 14% 16% 5%	1570
March	1st to 10th	Day	47% 5% 7% 17% 17% 7%	1900
	11th to 20th	Day	50% 6% 9% 16% 15% 3	2072
	21st to end	Day	52% 4 10% 20% 12% 1	2255
April	1st to 10th	Day	41% 5% 11% 22% 17% 3	2155
	11th to 20th	Day	42% 5% 7% 19% 23% 4	2134
	21st to end	Day	43% 6% 10% 26% 14% 1	2272
May	1st to 10th	Day	41% 7% 11% 27% 12% 3	2340
	11th to 20th	Day	47% 8% 13% 19% 12%	2305
	21st to end	Day	43% 9% 13% 22% 12% 2	2531
June	1st to 10th	Day	41% 9% 14% 22% 12% 1	2340
	11th to 20th	Day	35% 8% 19% 23% 14% 2	2340
	21st to end	Day	37% 11% 17% 20% 13% 3	2340
July	1st to 10th	Day	47% 10% 13% 18% 10% 3	2275
	11th to 20th	Day	46% 10% 16% 15% 11% 3	2271
	21st to end	Day	44% 12% 15% 21% 7% 1	2405
August	1st to 10th	Day	44% 13% 17% 17% 7% 1	2313
	11th to 20th	Day	47% 10% 14% 18% 11% 1	2125
	21st to end	Day	48% 10% 12% 16% 11% 3	2376
September	1st to 10th	Day	44% 8% 12% 17% 15% 4	2062
	11th to 20th	Day	44% 6% 10% 21% 18% 2	1980
	21st to end	Day	38% 6% 9% 23% 19% 6%	1980
October	1st to 10th	Day	34% 5% 8% 21% 24% 7%	1980
	11th to 20th	Day	34% 4 8% 21% 25% 8%	1922
	21st to end	Day	38% 4 7% 21% 25% 5%	1864
November	1st to 10th	Day	32% 5% 7% 24% 26% 6%	1672
	11th to 20th	Day	39% 4 5% 23% 23% 6%	1710
	21st to end	Day	42% 4 7% 21% 21% 4	1710
December	1st to 10th	Day	53% 4 5% 20% 14% 3	1710
	11th to 20th	Day	50% 4 8% 17% 18% 3	2150
	21st to end	Day	52% 3 10% 19% 12% 3	3124
January	1st to 10th	Night	52% 3 7% 20% 16% 2	4109
	11th to 20th	Night	54% 3 6% 13% 18% 6%	4120
	21st to end	Night	55% 3 6% 14% 18% 3	4369
February	1st to 10th	Night	50% 3 10% 18% 16% 3	2280
	11th to 20th	Night	54% 4 7% 17% 14% 5%	2219
	21st to end	Night	54% 3 8% 16% 13% 5%	1884
March	1st to 10th	Night	45% 4 10% 15% 19% 7%	2280
	11th to 20th	Night	47% 5% 8% 21% 15% 3	2106
	21st to end	Night	47% 5% 9% 24% 13% 2	2256
April	1st to 10th	Night	37% 5% 11% 23% 22% 3	1818
	11th to 20th	Night	36% 4 9% 22% 23% 6%	1775
	21st to end	Night	37% 6% 11% 30% 15% 1	1688
May	1st to 10th	Night	37% 6% 12% 25% 18% 2	1620
	11th to 20th	Night	37% 9% 18% 22% 13% 1	1593
	21st to end	Night	36% 9% 16% 24% 13% 2	1745
June	1st to 10th	Night	37% 7% 16% 26% 12% 2	1620
	11th to 20th	Night	23% 8% 22% 31% 14% 2	1620
	21st to end	Night	32% 9% 17% 26% 12% 4	1620
July	1st to 10th	Night	39% 12% 17% 20% 10% 3	1575
	11th to 20th	Night	31% 10% 20% 21% 12% 5%	1566
	21st to end	Night	35% 11% 18% 24% 10% 2	1672
August	1st to 10th	Night	33% 11% 18% 28% 10%	1600
	11th to 20th	Night	36% 10% 20% 17% 15% 2	1773
	21st to end	Night	34% 10% 17% 24% 13% 2	1980
September	1st to 10th	Night	36% 7% 15% 22% 16% 5%	1880
	11th to 20th	Night	38% 8% 11% 20% 21% 1	1980
	21st to end	Night	32% 5% 9% 25% 24% 5%	1980
October	1st to 10th	Night	28% 5% 8% 25% 26% 9%	1980
	11th to 20th	Night	36% 5% 8% 21% 22% 8%	2038
	21st to end	Night	37% 3 5% 23% 25% 7%	2488
November	1st to 10th	Night	35% 4 6% 22% 24% 8%	2406
	11th to 20th	Night	38% 3 7% 19% 26% 8%	2470
	21st to end	Night	44% 3 6% 22% 21% 5%	2470
December	1st to 10th	Night	54% 5% 7% 18% 14% 3	2470
	11th to 20th	Night	49% 3 7% 17% 21% 4	3044
	21st to end	Night	55% 5% 8% 18% 12% 1	4532

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% 27% 32% 10% 2	270
	11th to 20th	Day	37% 26% 22% 10% 4 1	270
	21st to end	Day	27% 30% 34% 7% 2	297
February	1st to 10th	Day	31% 28% 28% 10% 3	270
	11th to 20th	Day	42% 25% 27% 4 1 1	270
	21st to end	Day	44% 24% 27% 4 1	225
March	1st to 10th	Day	30% 24% 32% 11% 2	270
	11th to 20th	Day	28% 22% 28% 17% 4 1	442
	21st to end	Day	27% 20% 31% 15% 6% 1	490
April	1st to 10th	Day	22% 19% 28% 20% 11% 1	420
	11th to 20th	Day	22% 19% 28% 21% 9% 2	412
	21st to end	Day	23% 15% 30% 18% 12% 2	420
May	1st to 10th	Day	18% 15% 34% 18% 10% 5%	423
	11th to 20th	Day	13% 10% 30% 23% 16% 8%	447
	21st to end	Day	15% 6% 21% 28% 17% 14%	485
June	1st to 10th	Day	13% 6% 22% 26% 23% 11%	450
	11th to 20th	Day	7% 5% 19% 28% 23% 18%	450
	21st to end	Day	10% 6% 22% 26% 22% 15%	450
July	1st to 10th	Day	13% 4 14% 24% 26% 19%	445
	11th to 20th	Day	9% 6% 14% 22% 27% 22%	444
	21st to end	Day	10% 3 14% 24% 28% 20%	488
August	1st to 10th	Day	12% 5% 16% 24% 25% 18%	446
	11th to 20th	Day	12% 4 13% 32% 29% 10%	439
	21st to end	Day	15% 3 12% 25% 28% 17%	495
September	1st to 10th	Day	12% 4 14% 24% 33% 13%	450
	11th to 20th	Day	15% 4 14% 26% 30% 10%	450
	21st to end	Day	14% 6% 17% 30% 25% 8%	450
October	1st to 10th	Day	15% 7% 20% 30% 20% 8%	450
	11th to 20th	Day	16% 14% 28% 27% 14% 2	450
	21st to end	Day	22% 13% 30% 21% 11% 3	379
November	1st to 10th	Day	19% 11% 35% 26% 7% 2	270
	11th to 20th	Day	19% 19% 39% 20% 4	270
	21st to end	Day	23% 16% 38% 15% 7% 1	270
December	1st to 10th	Day	31% 19% 31% 14% 4 1	270
	11th to 20th	Day	26% 19% 32% 17% 5% 1	270
	21st to end	Day	31% 22% 30% 13% 3 1	297
January	1st to 10th	Night	26% 20% 28% 21% 5%	760
	11th to 20th	Night	28% 21% 25% 21% 4	760
	21st to end	Night	23% 20% 32% 22% 3	836
February	1st to 10th	Night	23% 17% 31% 25% 4	760
	11th to 20th	Night	28% 20% 30% 20% 1	743
	21st to end	Night	33% 19% 29% 18% 1	628
March	1st to 10th	Night	23% 16% 31% 25% 5%	760
	11th to 20th	Night	21% 17% 31% 24% 7% 1	760
	21st to end	Night	21% 15% 30% 25% 9%	821
April	1st to 10th	Night	17% 13% 30% 28% 11% 1	558
	11th to 20th	Night	18% 11% 32% 26% 12% 1	533
	21st to end	Night	16% 8% 29% 34% 12% 1	540
May	1st to 10th	Night	14% 9% 29% 31% 15% 3	540
	11th to 20th	Night	13% 6% 22% 32% 23% 5%	531
	21st to end	Night	8% 4 14% 35% 33% 6%	584
June	1st to 10th	Night	9% 3 15% 34% 34% 6%	540
	11th to 20th	Night	4 2 14% 34% 36% 10%	540
	21st to end	Night	7% 2 11% 35% 36% 9%	540
July	1st to 10th	Night	11% 2 6% 26% 44% 10%	525
	11th to 20th	Night	8% 3 6% 29% 40% 14%	522
	21st to end	Night	8% 1 6% 29% 42% 13%	591
August	1st to 10th	Night	6% 3 7% 26% 49% 9%	537
	11th to 20th	Night	8% 2 8% 36% 40% 6%	534
	21st to end	Night	10% 1 7% 31% 41% 11%	594
September	1st to 10th	Night	12% 3 8% 30% 39% 9%	620
	11th to 20th	Night	14% 4 14% 27% 35% 7%	720
	21st to end	Night	12% 4 14% 32% 33% 5%	720
October	1st to 10th	Night	12% 7% 18% 29% 25% 9%	720
	11th to 20th	Night	18% 9% 24% 27% 20% 2	720
	21st to end	Night	17% 10% 23% 33% 14% 2	792
November	1st to 10th	Night	15% 9% 21% 33% 18% 3	740
	11th to 20th	Night	16% 17% 28% 27% 11% 1	760
	21st to end	Night	22% 14% 24% 29% 11% 1	760
December	1st to 10th	Night	25% 18% 25% 25% 6%	760
	11th to 20th	Night	22% 16% 25% 29% 7% 1	760
	21st to end	Night	27% 17% 25% 26% 5%	836

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