Caesar Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caesar Creek State Park clear sky chart from 2005-11-06 to 2024-03-18.

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	15% 9% 4 7% 6% 3 5% 5% 5% 7% 35%	79350
	Night	15% 10% 4 7% 5% 3 4 4 5% 7% 36%	80357
Transparency	Day	48% 6% 12% 20% 12% 2	79065
	Night	48% 6% 11% 20% 13% 2	80162
Seeing	Day	17% 9% 25% 24% 16% 8%	14360
	Night	18% 8% 26% 31% 15% 2	24083

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	17% 17% 7% 9% 6% 3 4 4 5% 5% 23%	2616
	11th to 20th	Day	17% 14% 7% 12% 7% 5% 7% 4 4 5% 20%	2840
	21st to end	Day	29% 16% 10% 8% 4 3 3 3 4 5% 15%	3124
February	1st to 10th	Day	19% 13% 5% 10% 6% 3 5% 4 4 5% 26%	1773
	11th to 20th	Day	16% 11% 4 10% 8% 3 5% 4 4 6% 27%	1848
	21st to end	Day	18% 14% 6% 8% 5% 3 4 4 4 5% 29%	1570
March	1st to 10th	Day	18% 10% 5% 7% 6% 3 5% 4 5% 6% 32%	1932
	11th to 20th	Day	18% 10% 4 6% 6% 3 4 5% 5% 7% 31%	2058
	21st to end	Day	22% 10% 4 6% 6% 3 4 4 5% 8% 27%	2178
April	1st to 10th	Day	14% 9% 4 6% 6% 3 5% 4 6% 7% 35%	2095
	11th to 20th	Day	16% 8% 3 6% 6% 3 4 4 5% 6% 39%	2208
	21st to end	Day	19% 7% 3 7% 5% 3 5% 5% 5% 7% 34%	2340
May	1st to 10th	Day	20% 8% 3 6% 5% 3 5% 4 5% 6% 34%	2340
	11th to 20th	Day	20% 7% 3 6% 6% 4 5% 5% 5% 7% 33%	2301
	21st to end	Day	9% 6% 3 6% 7% 3 6% 7% 7% 10% 37%	2531
June	1st to 10th	Day	12% 5% 3 5% 6% 3 5% 5% 6% 9% 40%	2340
	11th to 20th	Day	10% 5% 2 5% 6% 3 5% 6% 6% 10% 42%	2483
	21st to end	Day	10% 4 3 6% 5% 3 6% 6% 7% 10% 39%	2520
July	1st to 10th	Day	11% 5% 2 5% 6% 4 6% 6% 7% 10% 37%	2520
	11th to 20th	Day	8% 6% 2 5% 6% 4 6% 6% 6% 11% 42%	2399
	21st to end	Day	10% 5% 2 5% 5% 4 5% 7% 7% 9% 41%	2547
August	1st to 10th	Day	8% 5% 2 5% 5% 3 5% 6% 7% 9% 43%	2327
	11th to 20th	Day	9% 5% 3 6% 6% 4 6% 5% 8% 10% 37%	2303
	21st to end	Day	9% 5% 2 5% 5% 4 4 5% 5% 9% 47%	2436
September	1st to 10th	Day	13% 5% 2 4 4 3 5% 5% 6% 7% 47%	2032
	11th to 20th	Day	10% 5% 3 4 5% 3 4 4 6% 10% 48%	1980
	21st to end	Day	14% 6% 2 5% 4 3 3 4 4 7% 47%	1980
October	1st to 10th	Day	11% 5% 2 6% 6% 3 5% 5% 5% 8% 46%	1980
	11th to 20th	Day	16% 7% 2 5% 4 2 4 4 5% 6% 45%	1805
	21st to end	Day	22% 8% 3 6% 4 3 3 4 4 8% 36%	1865
November	1st to 10th	Day	9% 6% 2 5% 5% 2 4 4 4 7% 51%	1672
	11th to 20th	Day	14% 11% 6% 7% 4 3 5% 4 5% 6% 36%	1710
	21st to end	Day	19% 10% 4 7% 6% 3 4 3 4 7% 34%	1710
December	1st to 10th	Day	21% 12% 7% 8% 7% 3 5% 4 4 6% 22%	1710
	11th to 20th	Day	16% 15% 5% 9% 6% 3 4 4 4 5% 27%	2153
	21st to end	Day	20% 21% 6% 10% 6% 4 4 4 4 5% 15%	3124
January	1st to 10th	Night	16% 18% 8% 10% 7% 3 4 4 4 5% 21%	4245
	11th to 20th	Night	14% 15% 6% 13% 9% 4 4 4 5% 5% 20%	4120
	21st to end	Night	26% 18% 7% 8% 5% 4 3 3 3 4 19%	4532
February	1st to 10th	Night	21% 12% 5% 7% 6% 3 5% 3 4 5% 29%	2404
	11th to 20th	Night	17% 11% 5% 7% 6% 4 4 5% 4 6% 31%	2218
	21st to end	Night	21% 13% 6% 8% 4 2 3 4 3 5% 30%	1884
March	1st to 10th	Night	17% 8% 3 7% 6% 3 4 4 5% 5% 38%	2247
	11th to 20th	Night	17% 8% 3 5% 5% 3 6% 4 5% 7% 36%	2068
	21st to end	Night	20% 9% 4 6% 6% 2 5% 5% 4 6% 33%	2178
April	1st to 10th	Night	15% 7% 3 6% 5% 3 4 6% 5% 7% 39%	1880
	11th to 20th	Night	14% 7% 3 6% 5% 2 5% 4 6% 8% 40%	1701
	21st to end	Night	17% 8% 3 6% 5% 2 4 5% 5% 8% 38%	1620
May	1st to 10th	Night	19% 8% 3 6% 6% 3 4 5% 5% 8% 33%	1620
	11th to 20th	Night	16% 7% 3 6% 4 3 4 4 6% 8% 38%	1592
	21st to end	Night	7% 5% 2 4 5% 4 5% 7% 8% 10% 43%	1744
June	1st to 10th	Night	8% 5% 2 4 5% 3 5% 5% 4 9% 50%	1620
	11th to 20th	Night	8% 4 2 4 5% 3 4 5% 8% 11% 46%	1472
	21st to end	Night	6% 3 2 4 5% 4 6% 7% 7% 11% 45%	1440
July	1st to 10th	Night	9% 5% 3 5% 4 3 4 5% 5% 9% 47%	1440
	11th to 20th	Night	7% 3 2 5% 5% 3 6% 5% 6% 8% 49%	1556
	21st to end	Night	9% 5% 2 6% 4 3 6% 4 6% 8% 48%	1771
August	1st to 10th	Night	6% 5% 2 5% 5% 4 4 6% 7% 8% 48%	1611
	11th to 20th	Night	7% 6% 2 6% 5% 2 4 5% 7% 10% 47%	1598
	21st to end	Night	7% 3 2 4 4 3 4 4 6% 9% 54%	1916
September	1st to 10th	Night	13% 5% 2 3 4 3 3 4 5% 7% 50%	1908
	11th to 20th	Night	9% 4 2 4 4 3 4 4 6% 8% 54%	1980
	21st to end	Night	12% 6% 2 4 5% 2 4 3 5% 6% 52%	1980
October	1st to 10th	Night	9% 5% 2 5% 4 3 3 4 5% 6% 52%	1980
	11th to 20th	Night	16% 7% 3 6% 5% 3 3 4 5% 7% 42%	2154
	21st to end	Night	20% 8% 3 6% 4 3 4 4 5% 6% 38%	2488
November	1st to 10th	Night	14% 7% 3 5% 4 3 4 3 4 6% 47%	2406
	11th to 20th	Night	16% 8% 3 6% 4 3 5% 4 5% 6% 39%	2470
	21st to end	Night	19% 11% 4 6% 6% 3 4 4 5% 7% 31%	2470
December	1st to 10th	Night	21% 12% 5% 10% 5% 3 4 4 5% 5% 27%	2470
	11th to 20th	Night	18% 12% 8% 7% 5% 3 3 4 4 6% 28%	3042
	21st to end	Night	20% 19% 7% 9% 7% 4 4 4 4 5% 16%	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	62% 6% 9% 14% 9%	2617
	11th to 20th	Day	68% 4 11% 12% 5%	2840
	21st to end	Day	73% 4 9% 10% 3 1	3124
February	1st to 10th	Day	61% 5% 9% 14% 10% 1	1773
	11th to 20th	Day	58% 5% 11% 17% 8%	1858
	21st to end	Day	58% 6% 9% 19% 8% 1	1570
March	1st to 10th	Day	54% 5% 10% 22% 9% 1	1932
	11th to 20th	Day	53% 6% 12% 19% 10% 1	2058
	21st to end	Day	57% 5% 12% 19% 7% 1	2178
April	1st to 10th	Day	47% 6% 11% 23% 12% 1	2095
	11th to 20th	Day	47% 5% 11% 20% 14% 3	2208
	21st to end	Day	50% 6% 10% 21% 11% 2	2340
May	1st to 10th	Day	52% 6% 11% 21% 9% 1	2340
	11th to 20th	Day	50% 8% 12% 18% 12% 1	2305
	21st to end	Day	40% 10% 16% 21% 11% 1	2531
June	1st to 10th	Day	40% 8% 11% 23% 15% 2	2340
	11th to 20th	Day	37% 8% 16% 22% 16% 2	2483
	21st to end	Day	38% 9% 16% 20% 14% 3	2520
July	1st to 10th	Day	40% 10% 13% 20% 15% 2	2451
	11th to 20th	Day	36% 10% 11% 26% 15% 1	2326
	21st to end	Day	35% 10% 15% 23% 13% 3	2405
August	1st to 10th	Day	34% 9% 15% 27% 13% 2	2314
	11th to 20th	Day	39% 8% 14% 25% 14% 1	2303
	21st to end	Day	33% 8% 14% 24% 17% 5%	2436
September	1st to 10th	Day	36% 7% 10% 24% 18% 5%	2032
	11th to 20th	Day	34% 5% 12% 26% 21% 2	1980
	21st to end	Day	38% 5% 10% 23% 23% 2	1980
October	1st to 10th	Day	37% 7% 11% 24% 19% 2	1980
	11th to 20th	Day	39% 5% 10% 26% 18% 2	1805
	21st to end	Day	48% 4 13% 20% 14% 1	1865
November	1st to 10th	Day	34% 4 11% 28% 20% 3	1672
	11th to 20th	Day	50% 4 10% 19% 15% 2	1710
	21st to end	Day	53% 4 10% 22% 11% 1	1710
December	1st to 10th	Day	63% 4 11% 17% 5%	1710
	11th to 20th	Day	59% 5% 10% 17% 8%	2150
	21st to end	Day	72% 5% 9% 8% 6%	3124
January	1st to 10th	Night	65% 6% 9% 13% 7%	4245
	11th to 20th	Night	65% 5% 10% 14% 5%	4120
	21st to end	Night	70% 3 8% 13% 4	4532
February	1st to 10th	Night	59% 4 10% 18% 8% 1	2404
	11th to 20th	Night	54% 4 10% 19% 12% 1	2219
	21st to end	Night	58% 4 10% 15% 10% 2	1884
March	1st to 10th	Night	49% 5% 9% 22% 14% 2	2247
	11th to 20th	Night	47% 6% 13% 21% 11% 3	2068
	21st to end	Night	52% 5% 11% 22% 9% 2	2178
April	1st to 10th	Night	42% 6% 13% 25% 12% 2	1880
	11th to 20th	Night	41% 5% 12% 17% 19% 5%	1701
	21st to end	Night	45% 6% 11% 23% 12% 3	1620
May	1st to 10th	Night	50% 6% 10% 20% 10% 3	1620
	11th to 20th	Night	45% 7% 13% 19% 14% 2	1593
	21st to end	Night	32% 10% 17% 25% 13% 4	1745
June	1st to 10th	Night	32% 7% 11% 27% 20% 2	1620
	11th to 20th	Night	30% 8% 18% 22% 18% 4	1472
	21st to end	Night	30% 10% 18% 21% 17% 5%	1440
July	1st to 10th	Night	33% 9% 14% 21% 19% 4	1400
	11th to 20th	Night	30% 7% 15% 27% 18% 3	1506
	21st to end	Night	31% 8% 14% 28% 17% 2	1672
August	1st to 10th	Night	29% 11% 14% 27% 16% 2	1600
	11th to 20th	Night	32% 7% 15% 27% 18% 1	1598
	21st to end	Night	26% 8% 15% 25% 21% 5%	1916
September	1st to 10th	Night	32% 6% 13% 24% 17% 6%	1908
	11th to 20th	Night	28% 6% 11% 27% 26% 3	1980
	21st to end	Night	34% 5% 10% 22% 26% 3	1980
October	1st to 10th	Night	32% 6% 11% 26% 23% 3	1980
	11th to 20th	Night	42% 5% 8% 24% 19% 2	2154
	21st to end	Night	47% 4 9% 22% 15% 2	2488
November	1st to 10th	Night	38% 4 12% 21% 21% 3	2406
	11th to 20th	Night	45% 4 9% 22% 17% 3	2470
	21st to end	Night	54% 4 11% 20% 10% 1	2470
December	1st to 10th	Night	59% 5% 9% 19% 7% 1	2470
	11th to 20th	Night	56% 5% 11% 20% 8% 1	3044
	21st to end	Night	71% 5% 8% 12% 4	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	23% 16% 38% 17% 5%	270
	11th to 20th	Day	27% 20% 35% 14% 4	270
	21st to end	Day	33% 15% 30% 17% 5%	297
February	1st to 10th	Day	26% 18% 33% 19% 4	270
	11th to 20th	Day	25% 21% 35% 16% 3	270
	21st to end	Day	26% 16% 44% 11% 2	225
March	1st to 10th	Day	23% 19% 37% 18% 4	302
	11th to 20th	Day	22% 14% 35% 21% 8% 1	449
	21st to end	Day	27% 15% 34% 18% 6%	462
April	1st to 10th	Day	19% 15% 32% 22% 10% 2	420
	11th to 20th	Day	20% 16% 26% 24% 11% 4	412
	21st to end	Day	24% 10% 35% 19% 9% 3	420
May	1st to 10th	Day	23% 12% 29% 23% 8% 4	423
	11th to 20th	Day	21% 7% 26% 25% 14% 6%	447
	21st to end	Day	13% 5% 22% 28% 20% 13%	485
June	1st to 10th	Day	13% 4 18% 33% 23% 10%	450
	11th to 20th	Day	10% 4 22% 31% 24% 8%	593
	21st to end	Day	10% 5% 25% 31% 20% 9%	630
July	1st to 10th	Day	12% 3 15% 25% 25% 20%	621
	11th to 20th	Day	10% 3 19% 27% 25% 16%	499
	21st to end	Day	11% 2 13% 28% 29% 16%	488
August	1st to 10th	Day	10% 2 13% 25% 30% 21%	446
	11th to 20th	Day	11% 5% 15% 30% 25% 14%	439
	21st to end	Day	9% 4 12% 26% 31% 17%	495
September	1st to 10th	Day	14% 2 14% 23% 32% 15%	450
	11th to 20th	Day	10% 3 13% 25% 33% 15%	450
	21st to end	Day	15% 9% 19% 25% 22% 10%	450
October	1st to 10th	Day	10% 4 22% 34% 19% 9%	450
	11th to 20th	Day	15% 12% 31% 24% 14% 3	450
	21st to end	Day	24% 11% 36% 24% 5% 1	380
November	1st to 10th	Day	14% 10% 32% 27% 12% 6%	270
	11th to 20th	Day	20% 19% 27% 21% 10% 3	270
	21st to end	Day	26% 11% 36% 22% 5%	270
December	1st to 10th	Day	22% 18% 34% 18% 7% 1	270
	11th to 20th	Day	21% 13% 40% 20% 6%	270
	21st to end	Day	29% 20% 31% 14% 5%	297
January	1st to 10th	Night	21% 16% 34% 22% 6%	845
	11th to 20th	Night	28% 13% 35% 21% 3	760
	21st to end	Night	22% 11% 37% 25% 3	836
February	1st to 10th	Night	28% 9% 33% 27% 3	760
	11th to 20th	Night	24% 13% 35% 25% 2	743
	21st to end	Night	28% 11% 38% 21% 2	628
March	1st to 10th	Night	20% 12% 35% 27% 6%	760
	11th to 20th	Night	20% 13% 34% 27% 6% 1	752
	21st to end	Night	24% 10% 31% 28% 8%	792
April	1st to 10th	Night	18% 10% 33% 32% 6% 1	620
	11th to 20th	Night	17% 8% 32% 30% 11% 1	533
	21st to end	Night	18% 8% 36% 28% 9% 1	540
May	1st to 10th	Night	21% 7% 31% 28% 11% 1	540
	11th to 20th	Night	19% 4 23% 35% 17% 2	531
	21st to end	Night	9% 3 19% 36% 29% 5%	584
June	1st to 10th	Night	9% 2 18% 46% 24% 1	540
	11th to 20th	Night	9% 3 16% 42% 27% 2	540
	21st to end	Night	7% 3 19% 43% 26% 2	540
July	1st to 10th	Night	11% 2 10% 36% 32% 9%	525
	11th to 20th	Night	7% 2 10% 39% 36% 6%	522
	21st to end	Night	10% 2 11% 41% 33% 4	591
August	1st to 10th	Night	7% 2 9% 39% 37% 4	537
	11th to 20th	Night	9% 1 11% 41% 33% 4	534
	21st to end	Night	7% 2 11% 33% 39% 7%	594
September	1st to 10th	Night	15% 2 13% 30% 35% 5%	648
	11th to 20th	Night	10% 3 12% 34% 36% 5%	720
	21st to end	Night	14% 4 19% 36% 25% 2	720
October	1st to 10th	Night	11% 4 23% 35% 22% 5%	720
	11th to 20th	Night	19% 8% 27% 33% 13% 1	720
	21st to end	Night	23% 7% 32% 28% 11%	792
November	1st to 10th	Night	17% 7% 29% 29% 16% 1	740
	11th to 20th	Night	19% 13% 31% 28% 9% 1	760
	21st to end	Night	23% 10% 28% 31% 8%	760
December	1st to 10th	Night	26% 11% 32% 25% 6%	760
	11th to 20th	Night	25% 8% 34% 26% 6% 1	760
	21st to end	Night	28% 14% 29% 26% 3	836

Page generated at 2024-03-15 14:01:45. Version ac07

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