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 2024-11-01.

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 6% 4 4 4 3 5% 7% 47%	100800
	Night	9% 7% 2 6% 4 4 4 3 5% 7% 48%	98293
Transparency	Day	37% 5% 13% 26% 16% 3	100550
	Night	36% 5% 13% 27% 17% 3	98133
Seeing	Day	15% 8% 33% 30% 12% 2	15867
	Night	13% 9% 37% 32% 9% 1	25745

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	8% 13% 5% 10% 6% 6% 5% 3 4 6% 35%	2538
	11th to 20th	Day	5% 11% 4 11% 6% 5% 9% 5% 5% 6% 34%	2540
	21st to end	Day	5% 9% 4 12% 6% 3 4 2 5% 5% 44%	3021
February	1st to 10th	Day	10% 12% 4 8% 6% 6% 5% 3 5% 6% 36%	1710
	11th to 20th	Day	8% 10% 4 9% 6% 4 3 2 4 6% 44%	1808
	21st to end	Day	11% 10% 4 7% 4 3 3 3 5% 5% 45%	1570
March	1st to 10th	Day	8% 8% 3 7% 4 3 3 3 5% 6% 51%	3182
	11th to 20th	Day	9% 7% 3 5% 4 3 3 3 5% 7% 51%	3480
	21st to end	Day	20% 11% 3 9% 5% 4 4 3 5% 5% 30%	3814
April	1st to 10th	Day	14% 8% 2 7% 4 4 4 3 4 7% 43%	2212
	11th to 20th	Day	19% 8% 2 5% 4 4 3 3 4 5% 42%	2393
	21st to end	Day	18% 7% 2 5% 3 3 4 4 6% 7% 40%	2470
May	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 4 5% 7% 40%	4120
	11th to 20th	Day	11% 6% 2 6% 4 4 4 3 5% 6% 50%	4082
	21st to end	Day	18% 6% 2 5% 4 3 4 4 5% 7% 43%	4538
June	1st to 10th	Day	11% 4 2 4 4 4 4 4 7% 8% 49%	2660
	11th to 20th	Day	12% 6% 2 4 3 3 3 4 5% 8% 50%	2660
	21st to end	Day	6% 4 2 4 3 4 4 4 7% 8% 54%	2660
July	1st to 10th	Day	10% 4 2 5% 4 4 5% 5% 6% 9% 45%	4430
	11th to 20th	Day	6% 4 1 5% 3 4 4 4 5% 8% 56%	4430
	21st to end	Day	4 3 1 5% 3 3 5% 4 6% 9% 57%	4589
August	1st to 10th	Day	7% 5% 2 5% 5% 4 5% 4 6% 9% 47%	4103
	11th to 20th	Day	14% 7% 2 6% 4 4 4 4 5% 7% 42%	4041
	21st to end	Day	6% 4 2 6% 3 3 3 3 5% 7% 58%	4449
September	1st to 10th	Day	12% 4 1 4 3 3 3 4 4 6% 56%	2180
	11th to 20th	Day	7% 4 1 4 3 4 4 3 5% 7% 58%	2090
	21st to end	Day	11% 4 1 4 3 2 3 2 5% 5% 59%	2090
October	1st to 10th	Day	14% 6% 2 4 3 2 3 3 4 5% 54%	2048
	11th to 20th	Day	11% 6% 2 3 3 3 3 3 4 5% 57%	1900
	21st to end	Day	13% 6% 3 6% 4 2 3 3 4 5% 51%	1914
November	1st to 10th	Day	7% 6% 3 5% 4 4 4 3 6% 7% 50%	1673
	11th to 20th	Day	6% 7% 2 7% 6% 4 4 4 4 6% 50%	1710
	21st to end	Day	8% 10% 3 6% 4 4 2 3 6% 7% 47%	1646
December	1st to 10th	Day	8% 8% 3 8% 5% 4 3 4 5% 6% 47%	1520
	11th to 20th	Day	7% 8% 3 6% 4 5% 4 4 5% 9% 46%	1735
	21st to end	Day	15% 14% 5% 11% 4 3 4 3 3 5% 34%	2794
January	1st to 10th	Night	6% 11% 5% 12% 6% 6% 4 4 6% 7% 34%	4417
	11th to 20th	Night	4 11% 4 8% 5% 5% 9% 5% 6% 7% 36%	4430
	21st to end	Night	4 8% 4 14% 5% 3 4 3 5% 6% 44%	4643
February	1st to 10th	Night	10% 10% 4 9% 5% 5% 4 3 5% 5% 38%	2470
	11th to 20th	Night	7% 11% 3 8% 4 4 4 3 5% 7% 44%	2275
	21st to end	Night	9% 7% 2 6% 4 5% 5% 3 6% 6% 47%	1884
March	1st to 10th	Night	8% 9% 2 6% 4 3 3 3 4 6% 51%	3680
	11th to 20th	Night	10% 6% 2 5% 4 3 4 2 5% 7% 51%	3480
	21st to end	Night	18% 10% 2 7% 5% 5% 5% 4 6% 6% 32%	3817
April	1st to 10th	Night	13% 8% 2 6% 4 3 4 3 5% 7% 44%	1966
	11th to 20th	Night	14% 8% 2 6% 4 3 3 3 6% 6% 44%	1733
	21st to end	Night	15% 7% 2 5% 4 5% 4 3 5% 6% 44%	1710
May	1st to 10th	Night	16% 5% 2 5% 4 4 4 3 5% 6% 46%	2850
	11th to 20th	Night	10% 5% 2 5% 4 3 4 4 5% 7% 50%	2823
	21st to end	Night	14% 6% 2 5% 4 4 5% 3 6% 8% 43%	3045
June	1st to 10th	Night	9% 4 1 3 3 3 3 3 6% 9% 55%	1520
	11th to 20th	Night	11% 5% 2 5% 3 4 4 3 6% 7% 51%	1497
	21st to end	Night	6% 4 1 3 2 4 4 4 7% 8% 57%	1520
July	1st to 10th	Night	8% 5% 1 5% 3 3 2 3 5% 9% 55%	2540
	11th to 20th	Night	5% 4 2 5% 4 3 4 3 6% 8% 57%	2540
	21st to end	Night	3 2 1 3 2 3 3 4 7% 10% 63%	2970
August	1st to 10th	Night	7% 5% 2 6% 4 4 4 5% 7% 9% 48%	2836
	11th to 20th	Night	10% 6% 2 6% 4 4 4 4 5% 6% 48%	2798
	21st to end	Night	6% 3 2 4 3 3 5% 3 5% 7% 59%	3216
September	1st to 10th	Night	9% 3 1 4 3 3 4 3 5% 5% 61%	2000
	11th to 20th	Night	6% 4 1 4 3 3 3 3 5% 7% 61%	2090
	21st to end	Night	9% 4 1 3 3 2 3 2 4 5% 63%	2090
October	1st to 10th	Night	16% 5% 2 4 2 2 3 3 4 4 55%	2111
	11th to 20th	Night	11% 5% 2 3 2 3 3 2 4 5% 59%	2280
	21st to end	Night	12% 6% 1 5% 3 2 3 4 5% 6% 53%	2681
November	1st to 10th	Night	6% 5% 3 5% 3 4 4 3 5% 7% 56%	2412
	11th to 20th	Night	7% 6% 1 6% 5% 5% 4 3 5% 7% 50%	2470
	21st to end	Night	7% 7% 3 5% 4 3 3 4 5% 7% 51%	2529
December	1st to 10th	Night	8% 8% 3 8% 4 4 4 3 5% 6% 47%	2660
	11th to 20th	Night	6% 10% 2 6% 4 3 4 3 5% 8% 50%	3437
	21st to end	Night	15% 12% 4 12% 4 4 3 3 4 5% 34%	4873

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	51% 5% 10% 21% 12% 1	2539
	11th to 20th	Day	51% 4 16% 18% 9% 2	2540
	21st to end	Day	43% 5% 17% 19% 15% 1	3021
February	1st to 10th	Day	49% 5% 15% 19% 10% 1	1710
	11th to 20th	Day	44% 4 11% 23% 15% 3	1818
	21st to end	Day	42% 4 14% 22% 12% 5%	1570
March	1st to 10th	Day	33% 6% 9% 28% 22% 2	3182
	11th to 20th	Day	34% 5% 11% 28% 20% 2	3480
	21st to end	Day	55% 7% 16% 16% 5% 1	3814
April	1st to 10th	Day	42% 4 13% 26% 14% 2	2212
	11th to 20th	Day	45% 4 11% 22% 16% 3	2396
	21st to end	Day	42% 6% 13% 25% 14%	2470
May	1st to 10th	Day	42% 6% 12% 22% 17% 1	4120
	11th to 20th	Day	34% 7% 11% 29% 17% 2	4086
	21st to end	Day	41% 6% 11% 27% 14% 1	4538
June	1st to 10th	Day	32% 7% 16% 31% 11% 2	2660
	11th to 20th	Day	33% 5% 15% 26% 18% 3	2660
	21st to end	Day	26% 6% 16% 33% 17% 3	2660
July	1st to 10th	Day	34% 6% 16% 27% 15% 2	4361
	11th to 20th	Day	27% 4 12% 34% 19% 4	4355
	21st to end	Day	23% 5% 16% 30% 21% 5%	4443
August	1st to 10th	Day	33% 5% 14% 28% 14% 5%	4090
	11th to 20th	Day	41% 5% 13% 26% 13% 1	4080
	21st to end	Day	27% 4 17% 26% 20% 6%	4448
September	1st to 10th	Day	29% 4 12% 28% 22% 5%	2180
	11th to 20th	Day	26% 5% 11% 33% 22% 2	2090
	21st to end	Day	28% 4 9% 29% 27% 3	2090
October	1st to 10th	Day	33% 4 10% 24% 26% 3	2048
	11th to 20th	Day	30% 3 12% 30% 20% 6%	1900
	21st to end	Day	37% 3 11% 28% 17% 4	1914
November	1st to 10th	Day	32% 5% 16% 24% 21% 3	1673
	11th to 20th	Day	36% 5% 12% 28% 17% 3	1710
	21st to end	Day	37% 4 12% 27% 16% 4	1646
December	1st to 10th	Day	39% 4 15% 26% 13% 3	1520
	11th to 20th	Day	36% 5% 17% 30% 12%	1732
	21st to end	Day	55% 4 7% 26% 7% 1	2794
January	1st to 10th	Night	49% 5% 11% 24% 11% 1	4417
	11th to 20th	Night	47% 5% 13% 26% 8% 1	4430
	21st to end	Night	41% 6% 16% 23% 12% 1	4643
February	1st to 10th	Night	47% 5% 15% 18% 13% 2	2470
	11th to 20th	Night	41% 4 13% 24% 14% 4	2275
	21st to end	Night	36% 5% 12% 28% 14% 5%	1884
March	1st to 10th	Night	33% 4 11% 23% 25% 3	3680
	11th to 20th	Night	33% 4 9% 29% 22% 3	3480
	21st to end	Night	49% 10% 15% 19% 6% 1	3817
April	1st to 10th	Night	39% 5% 14% 25% 16% 1	1966
	11th to 20th	Night	40% 5% 10% 26% 17% 2	1733
	21st to end	Night	40% 6% 13% 24% 16% 2	1710
May	1st to 10th	Night	38% 6% 14% 20% 19% 4	2850
	11th to 20th	Night	31% 6% 13% 28% 19% 2	2824
	21st to end	Night	38% 6% 16% 23% 15% 2	3046
June	1st to 10th	Night	25% 8% 19% 29% 16% 3	1520
	11th to 20th	Night	33% 6% 12% 28% 17% 5%	1497
	21st to end	Night	23% 6% 16% 33% 18% 3	1520
July	1st to 10th	Night	28% 4 18% 34% 13% 3	2500
	11th to 20th	Night	26% 4 12% 34% 18% 5%	2492
	21st to end	Night	16% 5% 19% 30% 24% 6%	2877
August	1st to 10th	Night	32% 5% 16% 30% 12% 5%	2826
	11th to 20th	Night	38% 4 14% 28% 14% 2	2825
	21st to end	Night	25% 6% 15% 25% 21% 8%	3216
September	1st to 10th	Night	25% 4 12% 28% 24% 6%	2000
	11th to 20th	Night	23% 4 12% 35% 22% 3	2090
	21st to end	Night	25% 4 8% 30% 29% 4	2090
October	1st to 10th	Night	33% 4 9% 24% 27% 2	2111
	11th to 20th	Night	29% 4 8% 28% 25% 6%	2280
	21st to end	Night	33% 4 13% 23% 23% 4	2681
November	1st to 10th	Night	29% 4 13% 27% 23% 5%	2412
	11th to 20th	Night	33% 5% 12% 25% 21% 5%	2470
	21st to end	Night	33% 4 13% 29% 18% 3	2529
December	1st to 10th	Night	38% 5% 14% 28% 14% 2	2660
	11th to 20th	Night	34% 4 13% 38% 11% 1	3439
	21st to end	Night	54% 4 9% 23% 9% 1	4873

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	17% 13% 28% 30% 11% 1	270
	11th to 20th	Day	14% 16% 35% 28% 7%	270
	21st to end	Day	15% 11% 44% 19% 8% 3	297
February	1st to 10th	Day	17% 13% 42% 23% 4	270
	11th to 20th	Day	14% 15% 40% 23% 6% 2	270
	21st to end	Day	17% 14% 45% 20% 3	225
March	1st to 10th	Day	15% 13% 39% 25% 7% 1	270
	11th to 20th	Day	17% 10% 40% 24% 7% 2	270
	21st to end	Day	24% 13% 33% 21% 8% 1	297
April	1st to 10th	Day	21% 15% 40% 18% 5%	392
	11th to 20th	Day	25% 14% 35% 22% 4 1	594
	21st to end	Day	23% 13% 31% 23% 8% 2	650
May	1st to 10th	Day	19% 10% 35% 27% 8% 1	653
	11th to 20th	Day	22% 9% 29% 25% 13% 2	675
	21st to end	Day	20% 7% 31% 29% 11% 2	734
June	1st to 10th	Day	11% 6% 26% 34% 16% 6%	680
	11th to 20th	Day	12% 6% 34% 33% 13% 2	680
	21st to end	Day	10% 6% 33% 36% 15% 1	680
July	1st to 10th	Day	8% 3 23% 39% 23% 3	671
	11th to 20th	Day	7% 3 28% 42% 17% 3	668
	21st to end	Day	6% 3 27% 44% 17% 4	739
August	1st to 10th	Day	8% 3 27% 41% 18% 3	676
	11th to 20th	Day	13% 2 28% 37% 17% 3	665
	21st to end	Day	8% 4 30% 37% 18% 4	704
September	1st to 10th	Day	11% 3 34% 32% 17% 4	390
	11th to 20th	Day	7% 7% 34% 30% 16% 6%	300
	21st to end	Day	18% 7% 31% 28% 13% 3	300
October	1st to 10th	Day	20% 6% 26% 29% 16% 3	300
	11th to 20th	Day	17% 12% 39% 24% 6% 2	300
	21st to end	Day	18% 15% 33% 24% 8% 2	330
November	1st to 10th	Day	16% 11% 37% 22% 10% 4	270
	11th to 20th	Day	14% 11% 46% 22% 6%	270
	21st to end	Day	18% 14% 35% 24% 7% 1	270
December	1st to 10th	Day	13% 13% 40% 25% 8% 1	270
	11th to 20th	Day	15% 10% 42% 24% 7% 1	270
	21st to end	Day	22% 11% 42% 20% 5% 1	297
January	1st to 10th	Night	12% 11% 41% 27% 7% 1	950
	11th to 20th	Night	10% 13% 42% 29% 5% 1	950
	21st to end	Night	12% 8% 45% 27% 7%	1045
February	1st to 10th	Night	16% 13% 39% 27% 5%	950
	11th to 20th	Night	14% 11% 43% 27% 5% 1	800
	21st to end	Night	12% 11% 40% 30% 6% 1	628
March	1st to 10th	Night	14% 11% 42% 28% 4	732
	11th to 20th	Night	17% 10% 41% 27% 6%	570
	21st to end	Night	21% 9% 38% 25% 7%	627
April	1st to 10th	Night	19% 9% 41% 29% 2	570
	11th to 20th	Night	19% 13% 36% 27% 4	563
	21st to end	Night	18% 10% 35% 28% 8%	570
May	1st to 10th	Night	16% 9% 35% 32% 8%	570
	11th to 20th	Night	17% 9% 34% 28% 11% 1	561
	21st to end	Night	18% 6% 36% 31% 9%	617
June	1st to 10th	Night	10% 5% 30% 40% 14% 2	570
	11th to 20th	Night	13% 5% 36% 35% 11%	570
	21st to end	Night	7% 4 27% 49% 14%	570
July	1st to 10th	Night	6% 3 25% 46% 19% 1	555
	11th to 20th	Night	5% 3 27% 53% 12% 1	552
	21st to end	Night	5% 3 27% 50% 15%	624
August	1st to 10th	Night	7% 3 24% 48% 18% 1	567
	11th to 20th	Night	10% 2 30% 42% 15% 1	564
	21st to end	Night	6% 2 34% 43% 15% 1	627
September	1st to 10th	Night	10% 5% 30% 41% 13% 1	570
	11th to 20th	Night	8% 4 35% 40% 11% 2	570
	21st to end	Night	12% 6% 36% 32% 13% 1	570
October	1st to 10th	Night	20% 6% 33% 29% 10% 1	591
	11th to 20th	Night	15% 13% 35% 30% 7%	760
	21st to end	Night	17% 9% 37% 29% 8%	1009
November	1st to 10th	Night	10% 10% 41% 32% 6% 1	928
	11th to 20th	Night	12% 13% 39% 28% 7% 1	950
	21st to end	Night	12% 10% 39% 30% 9%	950
December	1st to 10th	Night	13% 15% 41% 25% 5%	950
	11th to 20th	Night	14% 10% 40% 28% 8%	950
	21st to end	Night	19% 14% 35% 26% 6%	1045

Page generated at 2024-10-29 10:20:48. Version ac07

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