Honey Creek Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Honey Creek Observatory clear sky chart from 2005-11-06 to 2026-08-30.

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	10% 7% 2 7% 4 4 4 3 5% 7% 47%	151732
	Night	8% 7% 2 7% 4 4 4 3 5% 7% 48%	147862
Transparency	Day	37% 4 13% 26% 17% 3	146449
	Night	36% 4 13% 26% 18% 3	144170
Seeing	Day	15% 9% 34% 29% 11% 2	18448
	Night	13% 9% 37% 32% 8%	28241

By Month

Percentage Cloud Cover SW (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	10% 13% 4 12% 7% 6% 4 3 3 5% 34%	4720
	11th to 20th	Day	4 11% 4 11% 7% 7% 7% 5% 5% 5% 34%	4740
	21st to end	Day	3 8% 5% 12% 6% 4 5% 3 5% 5% 44%	5620
February	1st to 10th	Day	10% 12% 4 8% 6% 6% 5% 3 5% 7% 35%	1890
	11th to 20th	Day	8% 11% 4 9% 5% 3 3 2 4 6% 45%	2004
	21st to end	Day	10% 9% 3 7% 4 3 3 3 5% 5% 47%	1730
March	1st to 10th	Day	10% 8% 2 6% 4 3 3 2 4 5% 53%	4679
	11th to 20th	Day	8% 6% 3 5% 4 3 3 3 5% 8% 53%	5090
	21st to end	Day	18% 11% 3 9% 5% 4 4 3 5% 6% 31%	5585
April	1st to 10th	Day	14% 9% 3 7% 4 4 4 3 5% 7% 42%	2445
	11th to 20th	Day	17% 8% 3 6% 4 4 3 3 5% 6% 42%	2649
	21st to end	Day	19% 7% 2 5% 3 4 4 4 5% 7% 40%	2730
May	1st to 10th	Day	8% 5% 2 6% 4 4 5% 4 5% 7% 49%	7655
	11th to 20th	Day	13% 6% 2 6% 4 4 4 3 5% 5% 47%	7627
	21st to end	Day	19% 7% 2 6% 4 3 4 4 5% 6% 39%	8492
June	1st to 10th	Day	10% 5% 2 4 4 4 4 4 7% 8% 48%	2940
	11th to 20th	Day	11% 5% 2 5% 4 3 3 4 5% 8% 50%	2940
	21st to end	Day	7% 4 2 4 3 4 4 4 6% 8% 52%	2940
July	1st to 10th	Day	7% 4 2 6% 4 4 5% 5% 6% 9% 47%	8249
	11th to 20th	Day	8% 4 1 4 3 3 3 3 4 6% 61%	8250
	21st to end	Day	9% 5% 2 6% 4 4 5% 4 6% 9% 46%	8563
August	1st to 10th	Day	7% 5% 2 6% 5% 4 5% 4 6% 9% 46%	5931
	11th to 20th	Day	11% 6% 2 5% 4 4 4 3 6% 8% 47%	5951
	21st to end	Day	9% 4 2 6% 4 3 4 3 5% 8% 52%	6483
September	1st to 10th	Day	11% 4 1 4 3 3 3 4 4 6% 56%	2295
	11th to 20th	Day	7% 4 1 4 4 4 4 3 5% 7% 56%	2200
	21st to end	Day	11% 4 1 4 3 2 3 2 5% 6% 59%	2200
October	1st to 10th	Day	8% 4 1 3 2 2 2 2 3 4 69%	3507
	11th to 20th	Day	8% 5% 2 3 3 3 3 3 4 7% 59%	3240
	21st to end	Day	10% 6% 2 7% 4 3 4 4 5% 6% 50%	3236
November	1st to 10th	Day	8% 7% 3 5% 4 4 4 3 6% 7% 50%	1853
	11th to 20th	Day	7% 8% 2 6% 6% 4 3 4 4 6% 51%	1890
	21st to end	Day	8% 10% 3 6% 4 4 3 3 5% 7% 46%	1818
December	1st to 10th	Day	5% 6% 4 9% 6% 5% 4 3 4 4 48%	2690
	11th to 20th	Day	6% 7% 4 8% 5% 5% 5% 4 5% 8% 43%	2808
	21st to end	Day	12% 11% 4 12% 4 4 4 3 4 5% 38%	4092
January	1st to 10th	Night	7% 10% 4 13% 7% 6% 4 3 5% 6% 33%	8201
	11th to 20th	Night	2 9% 4 10% 6% 6% 7% 4 6% 6% 39%	8250
	21st to end	Night	2 7% 4 12% 5% 4 5% 3 5% 5% 48%	8591
February	1st to 10th	Night	10% 10% 4 10% 5% 5% 4 3 6% 6% 38%	2730
	11th to 20th	Night	7% 11% 3 9% 4 4 4 3 4 7% 43%	2521
	21st to end	Night	8% 7% 2 6% 4 5% 5% 3 6% 6% 49%	2076
March	1st to 10th	Night	9% 7% 2 6% 4 3 3 3 5% 6% 52%	5411
	11th to 20th	Night	10% 6% 2 5% 3 3 4 3 5% 7% 52%	5090
	21st to end	Night	14% 11% 3 7% 5% 5% 4 4 5% 7% 36%	5588
April	1st to 10th	Night	14% 8% 3 6% 4 3 4 3 5% 7% 44%	2172
	11th to 20th	Night	13% 8% 2 6% 4 3 3 3 6% 7% 44%	1917
	21st to end	Night	15% 8% 2 5% 4 5% 4 3 5% 6% 43%	1890
May	1st to 10th	Night	11% 4 2 5% 4 4 4 4 5% 8% 51%	5292
	11th to 20th	Night	11% 6% 2 5% 3 3 4 3 5% 7% 51%	5265
	21st to end	Night	17% 7% 2 6% 4 4 4 4 5% 7% 39%	5698
June	1st to 10th	Night	9% 4 1 3 3 3 3 3 6% 9% 55%	1680
	11th to 20th	Night	11% 5% 2 5% 3 3 4 3 6% 7% 52%	1657
	21st to end	Night	9% 4 1 3 2 4 4 4 6% 8% 54%	1680
July	1st to 10th	Night	5% 4 2 6% 4 4 4 4 7% 10% 49%	4740
	11th to 20th	Night	7% 4 2 4 3 3 3 2 4 7% 61%	4740
	21st to end	Night	7% 5% 2 5% 4 4 4 4 7% 10% 50%	5542
August	1st to 10th	Night	7% 4 2 5% 4 4 4 4 7% 11% 47%	4101
	11th to 20th	Night	8% 5% 2 5% 4 4 5% 4 6% 8% 49%	4118
	21st to end	Night	9% 4 2 5% 3 3 5% 3 6% 8% 52%	4677
September	1st to 10th	Night	9% 3 1 3 3 2 3 3 5% 6% 61%	2105
	11th to 20th	Night	6% 4 1 4 3 3 3 3 5% 7% 60%	2200
	21st to end	Night	9% 4 1 3 3 2 3 2 4 5% 63%	2200
October	1st to 10th	Night	9% 3 1 3 1 1 2 2 3 3 72%	3638
	11th to 20th	Night	8% 4 2 3 2 3 3 2 4 6% 63%	3899
	21st to end	Night	10% 6% 2 5% 3 3 4 4 5% 8% 50%	4560
November	1st to 10th	Night	7% 6% 3 5% 3 3 4 3 6% 7% 55%	2665
	11th to 20th	Night	7% 6% 1 6% 5% 4 4 3 5% 7% 51%	2730
	21st to end	Night	8% 7% 3 6% 4 3 3 4 5% 7% 50%	2796
December	1st to 10th	Night	5% 6% 3 7% 5% 4 4 3 5% 6% 52%	4720
	11th to 20th	Night	7% 9% 2 7% 4 4 5% 3 6% 7% 46%	5594
	21st to end	Night	12% 11% 4 11% 4 4 4 3 4 5% 38%	7128

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	55% 3 11% 19% 11%	4723
	11th to 20th	Day	52% 3 13% 18% 13% 2	4740
	21st to end	Day	43% 4 15% 21% 14% 2	5620
February	1st to 10th	Day	49% 5% 15% 19% 10% 1	1890
	11th to 20th	Day	43% 4 10% 23% 16% 3	2014
	21st to end	Day	40% 4 15% 23% 14% 5%	1730
March	1st to 10th	Day	35% 4 8% 27% 23% 3	4679
	11th to 20th	Day	31% 4 9% 27% 27% 2	5090
	21st to end	Day	54% 6% 14% 18% 6% 2	5585
April	1st to 10th	Day	43% 4 13% 26% 13% 2	2445
	11th to 20th	Day	44% 4 11% 22% 17% 3	2652
	21st to end	Day	43% 6% 12% 25% 14%	2730
May	1st to 10th	Day	33% 4 10% 28% 24% 1	7655
	11th to 20th	Day	38% 4 10% 24% 18% 6%	7631
	21st to end	Day	45% 4 9% 26% 14% 1	8493
June	1st to 10th	Day	33% 7% 16% 31% 12% 2	2940
	11th to 20th	Day	32% 5% 16% 26% 19% 3	2940
	21st to end	Day	28% 6% 15% 31% 17% 4	2940
July	1st to 10th	Day	32% 4 16% 30% 15% 2	8181
	11th to 20th	Day	26% 3 10% 29% 21% 11%	8175
	21st to end	Day	35% 4 17% 27% 15% 3	8374
August	1st to 10th	Day	33% 5% 15% 28% 14% 5%	4350
	11th to 20th	Day	41% 5% 14% 26% 13% 1	4340
	21st to end	Day	28% 4 17% 26% 20% 6%	4706
September	1st to 10th	Day	28% 4 14% 28% 21% 5%	2295
	11th to 20th	Day	28% 5% 12% 32% 21% 2	2200
	21st to end	Day	28% 4 9% 29% 27% 3	2200
October	1st to 10th	Day	22% 2 7% 20% 41% 8%	3507
	11th to 20th	Day	27% 2 15% 31% 20% 5%	3240
	21st to end	Day	36% 2 9% 32% 18% 3	3236
November	1st to 10th	Day	33% 5% 15% 25% 20% 3	1853
	11th to 20th	Day	35% 4 13% 28% 17% 4	1890
	21st to end	Day	38% 4 13% 27% 15% 4	1818
December	1st to 10th	Day	40% 3 15% 27% 13% 2	2690
	11th to 20th	Day	39% 4 18% 24% 14% 1	2805
	21st to end	Day	49% 3 9% 29% 9% 1	4092
January	1st to 10th	Night	52% 4 11% 22% 11% 1	8202
	11th to 20th	Night	45% 4 14% 23% 12% 1	8250
	21st to end	Night	39% 4 14% 25% 17% 1	8591
February	1st to 10th	Night	46% 5% 16% 18% 13% 2	2730
	11th to 20th	Night	42% 4 12% 24% 14% 4	2521
	21st to end	Night	35% 5% 11% 29% 15% 5%	2076
March	1st to 10th	Night	33% 3 9% 28% 23% 3	5411
	11th to 20th	Night	32% 3 8% 25% 28% 4	5090
	21st to end	Night	47% 7% 13% 24% 8% 1	5588
April	1st to 10th	Night	39% 4 14% 26% 15% 1	2172
	11th to 20th	Night	39% 4 10% 26% 18% 2	1917
	21st to end	Night	41% 6% 13% 23% 16% 1	1890
May	1st to 10th	Night	32% 4 10% 25% 26% 2	5293
	11th to 20th	Night	33% 4 11% 23% 23% 5%	5266
	21st to end	Night	45% 4 13% 23% 14% 1	5700
June	1st to 10th	Night	25% 7% 19% 28% 16% 3	1680
	11th to 20th	Night	32% 5% 12% 28% 18% 5%	1657
	21st to end	Night	26% 5% 16% 31% 18% 3	1680
July	1st to 10th	Night	30% 3 18% 35% 12% 2	4700
	11th to 20th	Night	26% 3 10% 30% 22% 10%	4692
	21st to end	Night	30% 4 21% 27% 15% 3	5418
August	1st to 10th	Night	32% 5% 17% 30% 12% 5%	3006
	11th to 20th	Night	38% 4 15% 28% 14% 2	3005
	21st to end	Night	25% 6% 15% 25% 21% 8%	3398
September	1st to 10th	Night	25% 4 14% 28% 23% 6%	2105
	11th to 20th	Night	23% 4 14% 34% 22% 3	2200
	21st to end	Night	25% 4 8% 31% 29% 4	2200
October	1st to 10th	Night	20% 2 6% 18% 49% 5%	3638
	11th to 20th	Night	25% 2 9% 31% 24% 9%	3899
	21st to end	Night	33% 3 13% 28% 20% 3	4560
November	1st to 10th	Night	30% 4 13% 27% 22% 5%	2665
	11th to 20th	Night	32% 4 13% 25% 21% 5%	2730
	21st to end	Night	34% 4 14% 29% 17% 2	2796
December	1st to 10th	Night	34% 3 14% 32% 15% 1	4720
	11th to 20th	Night	37% 4 13% 33% 11% 1	5596
	21st to end	Night	50% 3 10% 26% 10% 1	7128

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	19% 12% 29% 29% 10% 2	330
	11th to 20th	Day	15% 16% 37% 26% 6%	330
	21st to end	Day	15% 12% 46% 19% 7% 2	363
February	1st to 10th	Day	16% 14% 44% 21% 4	330
	11th to 20th	Day	13% 15% 42% 24% 5% 2	330
	21st to end	Day	16% 15% 47% 18% 3 1	273
March	1st to 10th	Day	16% 12% 42% 24% 5% 1	330
	11th to 20th	Day	16% 14% 39% 22% 7% 2	330
	21st to end	Day	23% 15% 34% 19% 8% 1	363
April	1st to 10th	Day	23% 14% 41% 17% 5%	465
	11th to 20th	Day	23% 16% 35% 22% 4 1	690
	21st to end	Day	25% 12% 32% 22% 8% 2	750
May	1st to 10th	Day	17% 10% 34% 27% 10% 2	753
	11th to 20th	Day	23% 10% 28% 25% 12% 1	775
	21st to end	Day	20% 6% 32% 28% 11% 2	844
June	1st to 10th	Day	11% 7% 28% 33% 15% 6%	780
	11th to 20th	Day	12% 7% 35% 32% 12% 2	780
	21st to end	Day	12% 5% 34% 35% 13% 1	780
July	1st to 10th	Day	7% 3 24% 40% 22% 4	771
	11th to 20th	Day	8% 3 27% 42% 18% 3	768
	21st to end	Day	7% 3 28% 43% 16% 3	849
August	1st to 10th	Day	8% 3 29% 40% 18% 2	776
	11th to 20th	Day	12% 2 28% 38% 17% 3	765
	21st to end	Day	8% 4 30% 38% 17% 3	802
September	1st to 10th	Day	10% 4 33% 32% 16% 4	425
	11th to 20th	Day	8% 6% 34% 30% 16% 6%	330
	21st to end	Day	18% 7% 29% 30% 14% 3	330
October	1st to 10th	Day	19% 6% 28% 29% 15% 3	330
	11th to 20th	Day	18% 12% 40% 22% 6% 2	330
	21st to end	Day	17% 17% 34% 23% 7% 1	363
November	1st to 10th	Day	16% 11% 37% 23% 9% 3	330
	11th to 20th	Day	15% 13% 45% 21% 6%	330
	21st to end	Day	18% 12% 37% 24% 7% 2	330
December	1st to 10th	Day	13% 12% 44% 24% 6% 1	330
	11th to 20th	Day	17% 12% 42% 22% 6% 1	330
	21st to end	Day	20% 11% 45% 20% 5% 1	363
January	1st to 10th	Night	13% 11% 41% 28% 7% 1	1050
	11th to 20th	Night	10% 14% 43% 28% 4 1	1050
	21st to end	Night	11% 9% 47% 26% 7%	1155
February	1st to 10th	Night	15% 13% 41% 27% 4	1050
	11th to 20th	Night	14% 12% 43% 27% 4	886
	21st to end	Night	11% 12% 42% 28% 6% 1	692
March	1st to 10th	Night	15% 12% 42% 27% 4	809
	11th to 20th	Night	17% 10% 41% 26% 6%	630
	21st to end	Night	21% 9% 40% 24% 6%	693
April	1st to 10th	Night	19% 10% 41% 29% 2	630
	11th to 20th	Night	18% 13% 39% 25% 4	623
	21st to end	Night	19% 11% 35% 28% 7%	630
May	1st to 10th	Night	14% 8% 35% 34% 9%	630
	11th to 20th	Night	18% 10% 33% 29% 10% 1	621
	21st to end	Night	19% 6% 35% 31% 9%	683
June	1st to 10th	Night	10% 5% 30% 40% 13% 2	630
	11th to 20th	Night	13% 5% 37% 35% 10%	630
	21st to end	Night	10% 4 27% 46% 13%	630
July	1st to 10th	Night	6% 3 26% 46% 19%	615
	11th to 20th	Night	5% 2 27% 53% 11%	612
	21st to end	Night	7% 3 28% 48% 14%	690
August	1st to 10th	Night	7% 3 26% 46% 17%	627
	11th to 20th	Night	10% 2 29% 43% 15%	624
	21st to end	Night	6% 2 34% 42% 15% 1	687
September	1st to 10th	Night	10% 5% 30% 42% 12% 1	600
	11th to 20th	Night	8% 4 36% 40% 11% 2	600
	21st to end	Night	12% 6% 35% 32% 14% 1	600
October	1st to 10th	Night	19% 7% 33% 30% 10% 1	622
	11th to 20th	Night	16% 12% 35% 30% 7%	800
	21st to end	Night	17% 9% 37% 29% 7%	1062
November	1st to 10th	Night	10% 10% 42% 31% 6% 1	1025
	11th to 20th	Night	12% 13% 40% 28% 6%	1050
	21st to end	Night	13% 10% 39% 30% 8%	1050
December	1st to 10th	Night	12% 14% 42% 26% 5%	1050
	11th to 20th	Night	15% 10% 40% 27% 8%	1050
	21st to end	Night	18% 14% 36% 26% 6%	1155

Page generated at 2026-08-27 03:07:14. Version ac07

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