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 2024-11-04.

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% 3 7% 5% 5% 5% 4 6% 7% 37%	100903
	Night	12% 8% 3 7% 4 4 4 3 5% 7% 41%	98070
Transparency	Day	43% 7% 10% 21% 15% 3	104670
	Night	41% 6% 10% 22% 17% 5%	102441
Seeing	Day	19% 12% 24% 21% 15% 7%	14668
	Night	17% 11% 22% 28% 19% 4	24674

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% 9% 6% 5% 5% 4 5% 5% 29%	2836
	11th to 20th	Day	19% 9% 5% 15% 4 3 4 2 3 4 31%	2840
	21st to end	Day	20% 13% 6% 8% 4 3 4 3 4 5% 32%	3284
February	1st to 10th	Day	18% 11% 5% 9% 5% 4 4 3 3 5% 34%	1900
	11th to 20th	Day	19% 11% 5% 8% 5% 4 3 3 4 5% 33%	1848
	21st to end	Day	20% 10% 3 8% 5% 4 4 3 4 6% 33%	1570
March	1st to 10th	Day	21% 12% 4 7% 4 4 4 3 5% 7% 28%	3120
	11th to 20th	Day	14% 8% 3 7% 4 3 3 3 4 5% 46%	3462
	21st to end	Day	15% 10% 3 7% 5% 4 4 4 5% 6% 37%	3815
April	1st to 10th	Day	12% 8% 3 6% 5% 5% 5% 4 7% 6% 41%	2275
	11th to 20th	Day	14% 9% 4 5% 5% 3 4 3 4 6% 42%	2254
	21st to end	Day	13% 8% 3 7% 5% 4 5% 4 6% 7% 39%	2399
May	1st to 10th	Day	14% 9% 3 8% 5% 4 5% 5% 6% 7% 34%	4082
	11th to 20th	Day	16% 10% 3 8% 5% 5% 4 4 5% 7% 33%	4081
	21st to end	Day	10% 7% 3 8% 5% 5% 5% 4 6% 8% 38%	4476
June	1st to 10th	Day	9% 6% 3 8% 6% 6% 5% 5% 6% 9% 37%	2470
	11th to 20th	Day	5% 5% 2 6% 6% 6% 6% 5% 7% 10% 42%	2470
	21st to end	Day	6% 6% 2 7% 6% 6% 6% 6% 9% 10% 36%	2470
July	1st to 10th	Day	7% 5% 2 8% 7% 7% 7% 6% 9% 11% 32%	4120
	11th to 20th	Day	11% 7% 3 7% 7% 6% 6% 5% 7% 9% 32%	4120
	21st to end	Day	16% 11% 4 10% 7% 7% 7% 6% 5% 6% 19%	4466
August	1st to 10th	Day	5% 5% 2 6% 5% 6% 6% 5% 9% 10% 42%	4089
	11th to 20th	Day	6% 5% 2 8% 6% 6% 6% 5% 8% 12% 36%	3729
	21st to end	Day	7% 5% 2 6% 5% 5% 7% 5% 6% 7% 45%	4180
September	1st to 10th	Day	11% 6% 3 7% 6% 6% 7% 4 6% 7% 36%	2176
	11th to 20th	Day	13% 8% 2 8% 5% 5% 4 3 6% 8% 38%	2090
	21st to end	Day	13% 5% 2 7% 5% 4 5% 3 6% 7% 43%	2090
October	1st to 10th	Day	10% 6% 2 5% 3 4 4 4 5% 5% 52%	2090
	11th to 20th	Day	12% 6% 2 5% 3 2 4 3 5% 6% 53%	2028
	21st to end	Day	14% 7% 2 5% 3 4 4 3 5% 6% 47%	1967
November	1st to 10th	Day	10% 5% 2 4 3 4 3 3 4 5% 55%	1699
	11th to 20th	Day	11% 9% 2 7% 3 3 4 4 5% 6% 46%	1710
	21st to end	Day	14% 9% 2 7% 4 4 4 3 5% 6% 42%	1710
December	1st to 10th	Day	18% 12% 4 9% 5% 3 3 3 5% 5% 33%	1710
	11th to 20th	Day	12% 12% 4 9% 5% 5% 5% 4 5% 5% 34%	2153
	21st to end	Day	15% 12% 7% 7% 5% 4 4 3 6% 7% 30%	3124
January	1st to 10th	Night	15% 13% 5% 9% 5% 3 3 3 4 4 34%	4109
	11th to 20th	Night	18% 11% 4 8% 6% 5% 3 2 4 4 34%	4120
	21st to end	Night	19% 15% 6% 7% 4 3 3 3 4 4 33%	4369
February	1st to 10th	Night	16% 9% 5% 9% 5% 3 4 3 5% 6% 35%	2280
	11th to 20th	Night	20% 11% 3 8% 5% 4 4 3 5% 4 33%	2218
	21st to end	Night	22% 11% 4 6% 4 4 3 3 5% 5% 31%	1884
March	1st to 10th	Night	22% 14% 4 6% 4 4 4 3 5% 5% 28%	3733
	11th to 20th	Night	11% 9% 2 6% 5% 4 4 3 5% 6% 46%	3496
	21st to end	Night	13% 9% 4 9% 5% 4 4 3 4 6% 38%	3817
April	1st to 10th	Night	11% 8% 2 6% 4 4 5% 3 6% 6% 45%	1919
	11th to 20th	Night	13% 9% 2 4 4 2 3 3 5% 7% 47%	1875
	21st to end	Night	12% 7% 2 5% 5% 4 4 3 7% 7% 44%	1781
May	1st to 10th	Night	12% 7% 3 7% 5% 5% 5% 4 7% 8% 38%	2813
	11th to 20th	Night	16% 10% 3 6% 4 4 4 3 5% 7% 38%	2812
	21st to end	Night	7% 6% 2 7% 5% 5% 5% 5% 7% 10% 41%	3079
June	1st to 10th	Night	6% 6% 3 8% 6% 5% 5% 5% 6% 8% 41%	1710
	11th to 20th	Night	4 3 1 4 4 4 5% 5% 7% 12% 52%	1710
	21st to end	Night	5% 5% 2 5% 5% 5% 6% 5% 6% 11% 43%	1710
July	1st to 10th	Night	7% 5% 3 6% 5% 5% 6% 6% 9% 10% 38%	2840
	11th to 20th	Night	9% 4 2 6% 4 4 4 4 7% 11% 45%	2840
	21st to end	Night	13% 10% 4 10% 7% 6% 6% 5% 7% 9% 24%	3087
August	1st to 10th	Night	3 4 2 5% 4 4 5% 4 7% 11% 51%	2825
	11th to 20th	Night	5% 4 3 8% 4 5% 5% 4 7% 10% 46%	3097
	21st to end	Night	5% 3 2 4 4 4 4 4 6% 8% 57%	3476
September	1st to 10th	Night	10% 6% 3 5% 4 4 5% 3 6% 7% 46%	1985
	11th to 20th	Night	10% 8% 3 6% 5% 4 4 3 6% 7% 43%	2090
	21st to end	Night	10% 5% 2 7% 4 3 3 3 5% 5% 52%	2090
October	1st to 10th	Night	10% 4 2 4 3 3 2 3 4 6% 59%	2090
	11th to 20th	Night	13% 5% 2 6% 3 3 3 3 5% 4 52%	2152
	21st to end	Night	12% 8% 2 5% 4 3 3 3 4 5% 50%	2627
November	1st to 10th	Night	11% 7% 2 6% 4 3 3 2 5% 6% 51%	2452
	11th to 20th	Night	11% 10% 3 5% 3 3 3 3 5% 6% 47%	2470
	21st to end	Night	14% 10% 3 7% 4 3 3 3 5% 5% 42%	2470
December	1st to 10th	Night	19% 11% 5% 7% 5% 5% 4 3 5% 5% 31%	2470
	11th to 20th	Night	15% 9% 6% 8% 5% 3 4 3 4 5% 38%	3042
	21st to end	Night	14% 13% 8% 10% 5% 6% 5% 4 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	53% 9% 6% 13% 12% 7%	3120
	11th to 20th	Day	40% 4 8% 23% 18% 7%	3462
	21st to end	Day	47% 5% 8% 25% 13% 2	3815
April	1st to 10th	Day	43% 5% 10% 21% 17% 3	2275
	11th to 20th	Day	42% 5% 7% 19% 23% 4	2254
	21st to end	Day	42% 6% 10% 26% 14% 1	2399
May	1st to 10th	Day	45% 9% 10% 24% 11% 1	4120
	11th to 20th	Day	49% 8% 12% 23% 8%	4085
	21st to end	Day	41% 9% 10% 22% 16% 2	4489
June	1st to 10th	Day	41% 9% 13% 22% 12% 2	2470
	11th to 20th	Day	35% 7% 19% 22% 14% 2	2470
	21st to end	Day	37% 11% 17% 19% 13% 3	2470
July	1st to 10th	Day	40% 12% 20% 19% 8% 1	4055
	11th to 20th	Day	43% 9% 17% 22% 6% 2	4051
	21st to end	Day	62% 9% 10% 14% 4 1	4324
August	1st to 10th	Day	31% 11% 16% 31% 11% 1	4076
	11th to 20th	Day	37% 8% 19% 22% 14% 1	3765
	21st to end	Day	34% 8% 11% 33% 13% 1	4179
September	1st to 10th	Day	44% 8% 12% 17% 15% 5%	2176
	11th to 20th	Day	44% 6% 10% 21% 18% 2	2090
	21st to end	Day	39% 6% 10% 22% 18% 5%	2090
October	1st to 10th	Day	25% 4 7% 18% 35% 12%	3480
	11th to 20th	Day	23% 3 5% 23% 31% 14%	3346
	21st to end	Day	29% 4 9% 23% 25% 10%	3217
November	1st to 10th	Day	32% 5% 8% 24% 26% 6%	1699
	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	54% 8% 9% 11% 14% 4	3733
	11th to 20th	Night	38% 5% 7% 24% 16% 10%	3496
	21st to end	Night	47% 5% 7% 23% 16% 2	3817
April	1st to 10th	Night	38% 5% 10% 23% 21% 3	1919
	11th to 20th	Night	36% 4 9% 22% 23% 6%	1875
	21st to end	Night	37% 6% 11% 30% 15% 1	1781
May	1st to 10th	Night	40% 11% 13% 24% 11% 1	2840
	11th to 20th	Night	45% 7% 13% 21% 13% 1	2813
	21st to end	Night	33% 11% 14% 25% 15% 2	3087
June	1st to 10th	Night	38% 7% 15% 25% 12% 2	1710
	11th to 20th	Night	23% 8% 22% 31% 15% 2	1710
	21st to end	Night	32% 9% 17% 26% 12% 4	1710
July	1st to 10th	Night	36% 11% 21% 23% 7% 2	2795
	11th to 20th	Night	31% 9% 21% 29% 7% 3	2786
	21st to end	Night	55% 9% 13% 15% 6% 1	2988
August	1st to 10th	Night	25% 8% 14% 38% 14% 1	2814
	11th to 20th	Night	31% 9% 23% 23% 14% 1	3127
	21st to end	Night	23% 8% 13% 38% 17% 1	3476
September	1st to 10th	Night	36% 7% 14% 21% 16% 5%	1985
	11th to 20th	Night	39% 7% 11% 20% 21% 2	2090
	21st to end	Night	34% 5% 10% 24% 23% 5%	2090
October	1st to 10th	Night	21% 4 7% 24% 29% 15%	3480
	11th to 20th	Night	22% 3 6% 22% 29% 18%	3573
	21st to end	Night	26% 3 7% 25% 27% 12%	4327
November	1st to 10th	Night	35% 4 7% 23% 24% 8%	2452
	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% 21% 32% 15% 6% 1	506
April	1st to 10th	Day	24% 20% 28% 18% 10% 1	460
	11th to 20th	Day	23% 19% 29% 20% 8% 2	452
	21st to end	Day	22% 15% 32% 18% 12% 2	460
May	1st to 10th	Day	18% 16% 33% 18% 10% 5%	463
	11th to 20th	Day	14% 10% 30% 24% 15% 7%	487
	21st to end	Day	15% 7% 22% 28% 16% 12%	529
June	1st to 10th	Day	14% 7% 22% 25% 21% 11%	490
	11th to 20th	Day	7% 5% 20% 28% 24% 17%	490
	21st to end	Day	9% 6% 22% 27% 22% 15%	490
July	1st to 10th	Day	13% 4 14% 26% 26% 18%	485
	11th to 20th	Day	10% 5% 14% 23% 26% 22%	484
	21st to end	Day	13% 3 15% 24% 26% 19%	532
August	1st to 10th	Day	11% 5% 17% 26% 25% 17%	486
	11th to 20th	Day	11% 4 16% 32% 28% 10%	479
	21st to end	Day	14% 3 11% 25% 30% 18%	539
September	1st to 10th	Day	11% 5% 15% 26% 31% 12%	490
	11th to 20th	Day	15% 5% 15% 26% 30% 10%	490
	21st to end	Day	17% 7% 17% 28% 24% 7%	490
October	1st to 10th	Day	14% 6% 21% 32% 20% 7%	490
	11th to 20th	Day	14% 14% 28% 27% 14% 2	490
	21st to end	Day	20% 12% 31% 23% 11% 3	416
November	1st to 10th	Day	19% 11% 35% 27% 7% 2	279
	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%	836
April	1st to 10th	Night	18% 14% 30% 27% 10% 1	589
	11th to 20th	Night	18% 12% 32% 26% 11% 1	563
	21st to end	Night	16% 8% 29% 33% 12% 1	570
May	1st to 10th	Night	14% 9% 28% 31% 16% 3	570
	11th to 20th	Night	14% 6% 22% 32% 23% 5%	561
	21st to end	Night	8% 4 15% 35% 32% 6%	617
June	1st to 10th	Night	9% 4 15% 34% 33% 6%	570
	11th to 20th	Night	4 2 14% 34% 36% 10%	570
	21st to end	Night	7% 2 11% 35% 36% 9%	570
July	1st to 10th	Night	11% 2 7% 27% 44% 10%	555
	11th to 20th	Night	8% 3 6% 29% 40% 14%	552
	21st to end	Night	8% 1 7% 30% 41% 13%	624
August	1st to 10th	Night	6% 2 8% 28% 47% 9%	567
	11th to 20th	Night	7% 2 9% 37% 39% 6%	564
	21st to end	Night	9% 1 6% 30% 42% 11%	627
September	1st to 10th	Night	12% 3 9% 30% 38% 8%	655
	11th to 20th	Night	14% 5% 14% 27% 34% 7%	760
	21st to end	Night	13% 4 14% 32% 32% 4	760
October	1st to 10th	Night	12% 6% 17% 30% 26% 9%	760
	11th to 20th	Night	17% 10% 24% 28% 20% 2	760
	21st to end	Night	16% 10% 23% 34% 15% 2	836
November	1st to 10th	Night	15% 9% 21% 33% 18% 3	755
	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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