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 2024-11-02.

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 7% 5% 4 4 4 6% 8% 36%	101581
	Night	15% 10% 3 7% 4 4 4 3 5% 7% 37%	97286
Transparency	Day	47% 6% 12% 22% 13% 1	101385
	Night	47% 5% 11% 22% 13% 2	97152
Seeing	Day	17% 9% 25% 24% 16% 8%	15298
	Night	18% 8% 26% 31% 15% 2	24847

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% 18% 7% 10% 4 4 4 3 5% 5% 23%	2616
	11th to 20th	Day	17% 15% 6% 13% 6% 7% 5% 3 4 5% 20%	2840
	21st to end	Day	28% 18% 9% 9% 4 3 3 2 4 5% 15%	3124
February	1st to 10th	Day	19% 14% 5% 10% 5% 5% 4 2 4 5% 26%	1773
	11th to 20th	Day	16% 12% 4 11% 7% 5% 4 3 5% 6% 27%	1848
	21st to end	Day	18% 15% 5% 9% 4 4 4 3 4 4 29%	1570
March	1st to 10th	Day	22% 16% 6% 9% 4 4 4 2 4 4 25%	3178
	11th to 20th	Day	14% 8% 3 7% 5% 4 4 4 5% 7% 39%	3480
	21st to end	Day	18% 10% 3 7% 4 4 5% 3 6% 7% 33%	3815
April	1st to 10th	Day	14% 11% 3 8% 5% 4 4 3 6% 7% 34%	2212
	11th to 20th	Day	16% 8% 3 7% 5% 5% 4 3 5% 6% 39%	2333
	21st to end	Day	18% 7% 3 7% 5% 4 5% 4 5% 7% 34%	2470
May	1st to 10th	Day	21% 10% 3 7% 4 4 4 3 5% 6% 31%	4082
	11th to 20th	Day	21% 8% 2 6% 4 4 4 4 5% 7% 36%	4081
	21st to end	Day	11% 7% 3 7% 5% 5% 6% 5% 7% 10% 34%	4476
June	1st to 10th	Day	12% 6% 3 6% 5% 4 6% 4 7% 8% 39%	2470
	11th to 20th	Day	9% 5% 2 6% 5% 5% 5% 5% 6% 10% 42%	2621
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 7% 10% 39%	2660
July	1st to 10th	Day	11% 6% 2 7% 5% 5% 5% 4 7% 10% 37%	4440
	11th to 20th	Day	7% 5% 2 5% 4 4 5% 4 7% 11% 45%	4221
	21st to end	Day	11% 7% 2 7% 6% 6% 6% 6% 7% 9% 34%	4466
August	1st to 10th	Day	9% 6% 2 5% 4 4 5% 4 7% 10% 42%	4104
	11th to 20th	Day	8% 5% 2 7% 4 5% 5% 4 8% 10% 39%	4044
	21st to end	Day	7% 4 2 5% 3 4 4 3 5% 9% 54%	4282
September	1st to 10th	Day	12% 6% 2 4 4 4 5% 4 5% 6% 48%	2144
	11th to 20th	Day	9% 5% 2 5% 4 4 4 4 6% 10% 48%	2090
	21st to end	Day	15% 7% 2 6% 4 3 3 3 5% 7% 45%	2090
October	1st to 10th	Day	11% 5% 2 6% 5% 4 4 3 5% 7% 48%	2090
	11th to 20th	Day	15% 7% 2 5% 4 3 4 3 5% 6% 46%	1905
	21st to end	Day	20% 8% 3 7% 4 4 3 3 4 7% 37%	1968
November	1st to 10th	Day	9% 7% 2 5% 5% 3 3 3 5% 7% 51%	1681
	11th to 20th	Day	14% 12% 5% 8% 4 4 5% 3 5% 6% 35%	1710
	21st to end	Day	18% 12% 3 8% 5% 4 4 2 4 6% 34%	1710
December	1st to 10th	Day	20% 14% 6% 9% 6% 5% 4 3 4 6% 22%	1710
	11th to 20th	Day	16% 16% 5% 10% 6% 4 4 4 4 5% 27%	2153
	21st to end	Day	20% 21% 6% 11% 5% 4 4 3 5% 5% 15%	3124
January	1st to 10th	Night	15% 19% 7% 12% 6% 5% 4 3 4 5% 21%	4245
	11th to 20th	Night	14% 16% 5% 15% 7% 5% 4 3 5% 5% 20%	4120
	21st to end	Night	26% 18% 7% 9% 4 5% 3 2 3 4 19%	4532
February	1st to 10th	Night	21% 13% 4 8% 5% 4 4 3 4 5% 29%	2404
	11th to 20th	Night	16% 12% 4 9% 6% 4 5% 4 5% 6% 31%	2218
	21st to end	Night	21% 14% 6% 8% 4 4 3 3 3 5% 30%	1884
March	1st to 10th	Night	21% 12% 3 7% 4 4 4 3 5% 5% 34%	3674
	11th to 20th	Night	13% 7% 3 6% 5% 4 4 4 6% 7% 43%	3480
	21st to end	Night	18% 8% 3 7% 5% 4 4 4 4 5% 39%	3817
April	1st to 10th	Night	15% 9% 2 6% 5% 4 4 4 5% 7% 38%	1984
	11th to 20th	Night	14% 8% 2 6% 4 3 4 4 6% 8% 40%	1796
	21st to end	Night	16% 8% 3 6% 4 3 4 4 5% 7% 38%	1710
May	1st to 10th	Night	24% 10% 3 8% 5% 4 4 4 6% 6% 27%	2813
	11th to 20th	Night	19% 6% 3 6% 4 3 4 3 6% 8% 38%	2812
	21st to end	Night	9% 5% 1 6% 4 4 5% 4 7% 9% 46%	3079
June	1st to 10th	Night	8% 6% 2 5% 4 4 4 4 5% 8% 49%	1710
	11th to 20th	Night	8% 4 1 5% 4 4 5% 3 9% 11% 46%	1553
	21st to end	Night	6% 5% 1 4 5% 5% 6% 6% 8% 10% 45%	1520
July	1st to 10th	Night	11% 5% 2 5% 3 4 4 4 5% 9% 48%	2530
	11th to 20th	Night	7% 4 1 5% 4 4 4 4 6% 9% 52%	2737
	21st to end	Night	11% 7% 2 7% 5% 5% 5% 4 7% 9% 39%	3087
August	1st to 10th	Night	8% 7% 2 7% 5% 5% 5% 4 7% 8% 43%	2825
	11th to 20th	Night	8% 8% 3 7% 4 4 4 3 6% 8% 45%	2785
	21st to end	Night	4 3 1 5% 3 4 4 3 6% 10% 56%	3370
September	1st to 10th	Night	12% 5% 2 4 3 4 4 3 5% 7% 51%	2015
	11th to 20th	Night	9% 4 1 5% 3 3 4 3 5% 7% 54%	2090
	21st to end	Night	13% 7% 2 5% 4 3 3 2 5% 6% 49%	2090
October	1st to 10th	Night	9% 5% 2 6% 4 4 3 3 5% 6% 54%	2090
	11th to 20th	Night	15% 7% 3 7% 4 4 3 3 5% 7% 44%	2274
	21st to end	Night	19% 8% 2 7% 4 4 4 3 5% 6% 40%	2627
November	1st to 10th	Night	14% 7% 2 6% 4 3 3 3 4 6% 47%	2431
	11th to 20th	Night	16% 9% 3 7% 4 4 5% 3 5% 6% 39%	2470
	21st to end	Night	18% 12% 4 7% 5% 4 4 3 5% 7% 31%	2470
December	1st to 10th	Night	20% 12% 4 11% 5% 4 4 3 5% 5% 27%	2470
	11th to 20th	Night	18% 13% 7% 8% 5% 4 3 4 4 6% 28%	3042
	21st to end	Night	20% 20% 6% 10% 6% 5% 4 3 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	63% 4 7% 17% 7% 1	3178
	11th to 20th	Day	42% 6% 11% 24% 16% 1	3480
	21st to end	Day	49% 6% 12% 22% 10% 1	3815
April	1st to 10th	Day	48% 6% 11% 22% 11% 1	2212
	11th to 20th	Day	46% 5% 11% 21% 14% 3	2333
	21st to end	Day	48% 6% 11% 21% 11% 2	2470
May	1st to 10th	Day	53% 6% 12% 21% 7% 1	4120
	11th to 20th	Day	47% 7% 13% 22% 10%	4085
	21st to end	Day	39% 10% 15% 19% 14% 2	4489
June	1st to 10th	Day	40% 8% 12% 23% 15% 2	2470
	11th to 20th	Day	37% 8% 15% 23% 17% 1	2621
	21st to end	Day	38% 8% 16% 20% 15% 3	2660
July	1st to 10th	Day	42% 6% 12% 22% 17% 2	4371
	11th to 20th	Day	33% 6% 10% 32% 19% 1	4148
	21st to end	Day	44% 6% 14% 19% 14% 4	4324
August	1st to 10th	Day	36% 6% 16% 30% 11% 1	4091
	11th to 20th	Day	37% 5% 11% 30% 16% 1	4083
	21st to end	Day	29% 5% 14% 31% 19% 3	4281
September	1st to 10th	Day	35% 7% 10% 24% 21% 5%	2144
	11th to 20th	Day	33% 5% 12% 26% 22% 3	2090
	21st to end	Day	40% 5% 10% 22% 22% 2	2090
October	1st to 10th	Day	36% 6% 11% 25% 20% 2	2090
	11th to 20th	Day	38% 4 9% 27% 19% 2	1905
	21st to end	Day	47% 4 13% 21% 15% 1	1968
November	1st to 10th	Day	34% 4 11% 28% 20% 3	1681
	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	52% 5% 9% 22% 11% 1	3674
	11th to 20th	Night	39% 7% 14% 26% 13% 2	3480
	21st to end	Night	46% 6% 9% 27% 11% 1	3817
April	1st to 10th	Night	44% 6% 13% 24% 12% 2	1984
	11th to 20th	Night	41% 5% 12% 18% 19% 4	1796
	21st to end	Night	44% 6% 11% 23% 13% 3	1710
May	1st to 10th	Night	57% 6% 9% 19% 7% 2	2840
	11th to 20th	Night	43% 7% 14% 26% 9% 1	2813
	21st to end	Night	31% 9% 17% 27% 12% 5%	3087
June	1st to 10th	Night	33% 7% 11% 26% 21% 2	1710
	11th to 20th	Night	29% 8% 18% 22% 19% 4	1553
	21st to end	Night	31% 9% 17% 21% 17% 5%	1520
July	1st to 10th	Night	35% 6% 11% 24% 18% 5%	2490
	11th to 20th	Night	29% 5% 13% 33% 19% 2	2687
	21st to end	Night	40% 5% 14% 22% 15% 4	2988
August	1st to 10th	Night	37% 7% 13% 29% 12% 1	2814
	11th to 20th	Night	37% 4 11% 27% 20% 1	2812
	21st to end	Night	25% 5% 16% 30% 21% 3	3370
September	1st to 10th	Night	32% 6% 13% 24% 19% 6%	2015
	11th to 20th	Night	28% 6% 10% 26% 27% 4	2090
	21st to end	Night	36% 5% 10% 21% 25% 2	2090
October	1st to 10th	Night	30% 6% 11% 26% 24% 3	2090
	11th to 20th	Night	41% 4 8% 25% 20% 2	2274
	21st to end	Night	46% 4 9% 23% 17% 2	2627
November	1st to 10th	Night	38% 4 12% 21% 22% 3	2431
	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% 15% 34% 21% 8% 1	460
	21st to end	Day	27% 15% 33% 19% 6%	506
April	1st to 10th	Day	19% 16% 32% 21% 9% 2	460
	11th to 20th	Day	20% 17% 26% 24% 11% 3	452
	21st to end	Day	22% 10% 36% 20% 10% 2	460
May	1st to 10th	Day	22% 12% 30% 24% 8% 4	463
	11th to 20th	Day	21% 8% 25% 24% 14% 8%	487
	21st to end	Day	12% 5% 23% 29% 20% 12%	529
June	1st to 10th	Day	12% 4 19% 32% 22% 10%	490
	11th to 20th	Day	10% 4 21% 32% 25% 8%	641
	21st to end	Day	10% 5% 25% 31% 20% 9%	680
July	1st to 10th	Day	13% 3 16% 25% 24% 19%	671
	11th to 20th	Day	10% 3 20% 26% 26% 15%	542
	21st to end	Day	11% 2 14% 30% 28% 15%	532
August	1st to 10th	Day	10% 2 13% 26% 29% 20%	486
	11th to 20th	Day	11% 4 16% 31% 24% 13%	479
	21st to end	Day	9% 3 12% 26% 32% 18%	539
September	1st to 10th	Day	13% 3 13% 23% 33% 15%	490
	11th to 20th	Day	9% 3 12% 27% 34% 15%	490
	21st to end	Day	19% 9% 18% 24% 22% 9%	490
October	1st to 10th	Day	10% 4 21% 35% 20% 10%	490
	11th to 20th	Day	15% 12% 31% 23% 15% 5%	490
	21st to end	Day	22% 11% 35% 25% 7% 1	417
November	1st to 10th	Day	14% 10% 32% 27% 12% 6%	273
	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	760
	21st to end	Night	23% 10% 32% 28% 7%	836
April	1st to 10th	Night	19% 11% 33% 31% 6% 1	654
	11th to 20th	Night	18% 8% 33% 29% 10% 1	563
	21st to end	Night	18% 8% 36% 28% 8% 1	570
May	1st to 10th	Night	21% 7% 31% 28% 12% 1	570
	11th to 20th	Night	18% 4 23% 35% 17% 2	561
	21st to end	Night	9% 3 20% 37% 27% 4	617
June	1st to 10th	Night	9% 2 19% 45% 23% 1	570
	11th to 20th	Night	9% 3 16% 43% 27% 2	570
	21st to end	Night	6% 3 20% 43% 26% 2	570
July	1st to 10th	Night	11% 2 10% 37% 31% 9%	555
	11th to 20th	Night	7% 3 10% 40% 35% 6%	552
	21st to end	Night	11% 2 11% 41% 32% 4	624
August	1st to 10th	Night	8% 2 10% 38% 37% 4	567
	11th to 20th	Night	9% 1 11% 43% 32% 4	564
	21st to end	Night	7% 2 11% 32% 40% 8%	627
September	1st to 10th	Night	14% 2 14% 31% 34% 5%	685
	11th to 20th	Night	10% 3 11% 35% 36% 5%	760
	21st to end	Night	16% 4 19% 36% 24% 2	760
October	1st to 10th	Night	11% 4 23% 36% 22% 5%	760
	11th to 20th	Night	18% 8% 26% 33% 14% 1	760
	21st to end	Night	22% 7% 33% 28% 11%	836
November	1st to 10th	Night	17% 7% 29% 30% 16% 1	748
	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 2024-10-30 13:19:22. Version ac07

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