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 2024-03-06.

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	11% 7% 3 6% 5% 3 4 4 5% 7% 47%	78155
	Night	9% 7% 3 6% 5% 3 4 4 5% 7% 48%	81364
Transparency	Day	38% 5% 13% 26% 15% 3	77866
	Night	37% 5% 13% 27% 16% 3	81176
Seeing	Day	15% 8% 33% 30% 12% 2	14855
	Night	13% 9% 36% 32% 9% 1	24988

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% 12% 5% 10% 7% 5% 5% 4 4 6% 35%	2538
	11th to 20th	Day	6% 10% 4 9% 8% 4 9% 6% 5% 6% 34%	2540
	21st to end	Day	5% 9% 4 10% 8% 3 4 4 5% 5% 44%	3021
February	1st to 10th	Day	11% 11% 5% 7% 7% 4 6% 4 4 7% 36%	1710
	11th to 20th	Day	8% 9% 4 9% 6% 3 3 2 4 6% 44%	1808
	21st to end	Day	11% 9% 4 6% 5% 2 4 4 5% 5% 45%	1570
March	1st to 10th	Day	10% 9% 4 6% 4 2 3 3 4 5% 49%	1876
	11th to 20th	Day	11% 7% 5% 6% 5% 3 4 5% 6% 8% 41%	1980
	21st to end	Day	15% 12% 4 7% 5% 3 5% 4 5% 7% 32%	2178
April	1st to 10th	Day	14% 7% 3 6% 5% 3 4 4 4 7% 43%	2095
	11th to 20th	Day	20% 8% 3 5% 5% 2 4 3 4 6% 41%	2265
	21st to end	Day	18% 7% 2 5% 4 2 4 4 5% 8% 41%	2340
May	1st to 10th	Day	15% 6% 3 5% 6% 3 5% 5% 5% 6% 41%	2340
	11th to 20th	Day	16% 8% 3 5% 5% 3 4 4 5% 6% 42%	2302
	21st to end	Day	18% 6% 3 5% 4 3 4 5% 6% 8% 39%	2554
June	1st to 10th	Day	11% 4 2 3 5% 3 4 5% 6% 8% 49%	2520
	11th to 20th	Day	11% 5% 2 4 4 3 3 4 5% 8% 51%	2520
	21st to end	Day	6% 4 2 3 3 3 4 5% 7% 9% 55%	2520
July	1st to 10th	Day	7% 3 2 4 4 2 5% 6% 6% 10% 52%	2520
	11th to 20th	Day	6% 3 1 3 4 2 3 5% 5% 8% 61%	2520
	21st to end	Day	6% 4 2 4 4 2 6% 5% 7% 8% 54%	2617
August	1st to 10th	Day	8% 5% 2 5% 6% 4 5% 6% 6% 10% 42%	2328
	11th to 20th	Day	9% 4 2 5% 4 3 4 4 6% 8% 51%	2301
	21st to end	Day	7% 4 2 4 4 2 4 4 5% 8% 56%	2533
September	1st to 10th	Day	12% 4 2 3 3 2 3 4 4 7% 55%	2066
	11th to 20th	Day	8% 4 1 3 4 2 4 4 4 7% 58%	1980
	21st to end	Day	12% 4 1 3 3 2 3 3 5% 6% 58%	1980
October	1st to 10th	Day	15% 5% 2 4 3 2 3 3 4 5% 53%	1941
	11th to 20th	Day	12% 6% 2 3 3 2 3 3 4 6% 57%	1800
	21st to end	Day	14% 6% 3 6% 4 2 2 3 4 5% 51%	1814
November	1st to 10th	Day	7% 6% 3 4 5% 3 4 4 6% 7% 51%	1673
	11th to 20th	Day	7% 7% 3 6% 6% 3 4 5% 4 6% 50%	1710
	21st to end	Day	8% 9% 4 5% 4 2 3 4 5% 8% 47%	1646
December	1st to 10th	Day	8% 7% 3 7% 6% 3 3 5% 5% 6% 47%	1520
	11th to 20th	Day	7% 7% 4 5% 5% 3 4 5% 4 10% 46%	1735
	21st to end	Day	15% 13% 5% 10% 5% 2 4 5% 3 5% 34%	2794
January	1st to 10th	Night	6% 11% 5% 10% 8% 4 4 4 6% 7% 34%	4417
	11th to 20th	Night	4 11% 5% 7% 6% 3 10% 6% 6% 7% 36%	4430
	21st to end	Night	4 8% 4 12% 7% 2 4 4 5% 6% 44%	4643
February	1st to 10th	Night	11% 9% 4 8% 6% 3 5% 4 5% 6% 38%	2470
	11th to 20th	Night	8% 9% 3 8% 5% 3 4 5% 4 7% 44%	2275
	21st to end	Night	9% 7% 2 5% 5% 4 5% 5% 5% 6% 48%	1884
March	1st to 10th	Night	9% 8% 3 7% 5% 3 4 4 4 7% 46%	2200
	11th to 20th	Night	14% 7% 3 5% 5% 2 4 3 6% 7% 45%	1980
	21st to end	Night	14% 10% 3 6% 6% 3 4 4 4 6% 39%	2178
April	1st to 10th	Night	13% 7% 3 6% 4 2 4 4 5% 7% 45%	1863
	11th to 20th	Night	15% 8% 3 5% 5% 2 3 4 6% 7% 43%	1641
	21st to end	Night	14% 6% 3 5% 4 3 4 4 5% 7% 44%	1620
May	1st to 10th	Night	13% 6% 2 4 5% 3 4 5% 5% 8% 44%	1620
	11th to 20th	Night	16% 6% 2 4 4 2 4 5% 5% 7% 44%	1593
	21st to end	Night	14% 6% 2 5% 5% 3 5% 5% 5% 9% 41%	1718
June	1st to 10th	Night	10% 3 1 3 3 2 4 4 6% 9% 56%	1440
	11th to 20th	Night	11% 4 2 5% 3 3 4 4 5% 8% 51%	1417
	21st to end	Night	6% 3 2 2 3 3 4 5% 6% 9% 58%	1440
July	1st to 10th	Night	6% 4 2 4 4 2 4 4 6% 11% 54%	1440
	11th to 20th	Night	4 3 1 3 4 2 4 4 6% 9% 62%	1440
	21st to end	Night	5% 2 2 4 4 2 4 5% 6% 9% 57%	1697
August	1st to 10th	Night	6% 4 3 5% 5% 3 4 6% 6% 9% 49%	1611
	11th to 20th	Night	7% 3 2 4 4 3 4 5% 6% 7% 57%	1600
	21st to end	Night	4 3 1 4 3 2 4 5% 6% 7% 61%	1821
September	1st to 10th	Night	10% 3 2 3 4 2 3 4 5% 6% 60%	1894
	11th to 20th	Night	6% 4 1 4 3 2 3 4 5% 7% 61%	1980
	21st to end	Night	10% 4 2 3 3 2 3 3 4 6% 62%	1980
October	1st to 10th	Night	17% 5% 2 4 3 2 4 3 4 5% 53%	1999
	11th to 20th	Night	11% 5% 2 3 3 2 3 3 4 6% 59%	2160
	21st to end	Night	13% 6% 2 4 4 2 3 4 5% 5% 53%	2539
November	1st to 10th	Night	6% 5% 3 4 4 3 4 4 5% 6% 57%	2405
	11th to 20th	Night	8% 5% 2 5% 6% 4 4 3 5% 8% 50%	2470
	21st to end	Night	8% 7% 3 5% 4 2 3 4 5% 7% 52%	2529
December	1st to 10th	Night	8% 8% 3 7% 5% 3 4 4 5% 6% 47%	2660
	11th to 20th	Night	6% 9% 3 5% 4 2 4 4 5% 8% 50%	3437
	21st to end	Night	15% 12% 4 11% 5% 3 3 4 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	39% 5% 11% 28% 17% 2	1876
	11th to 20th	Day	42% 6% 12% 25% 14% 2	1980
	21st to end	Day	53% 6% 14% 18% 7% 1	2178
April	1st to 10th	Day	42% 4 13% 26% 13% 2	2095
	11th to 20th	Day	46% 4 10% 22% 15% 3	2268
	21st to end	Day	41% 6% 13% 26% 13%	2340
May	1st to 10th	Day	44% 6% 12% 24% 13%	2340
	11th to 20th	Day	43% 6% 14% 25% 11%	2306
	21st to end	Day	43% 7% 14% 22% 13% 1	2554
June	1st to 10th	Day	32% 7% 16% 31% 12% 2	2520
	11th to 20th	Day	32% 5% 15% 27% 18% 3	2520
	21st to end	Day	25% 7% 16% 33% 17% 3	2520
July	1st to 10th	Day	27% 8% 16% 31% 16% 3	2451
	11th to 20th	Day	24% 5% 11% 30% 24% 7%	2445
	21st to end	Day	25% 7% 13% 32% 19% 4	2471
August	1st to 10th	Day	36% 8% 16% 27% 10% 3	2314
	11th to 20th	Day	31% 6% 13% 33% 17% 1	2301
	21st to end	Day	27% 5% 13% 29% 20% 7%	2533
September	1st to 10th	Day	30% 5% 13% 27% 21% 6%	2066
	11th to 20th	Day	27% 5% 11% 33% 22% 3	1980
	21st to end	Day	29% 4 9% 30% 26% 1	1980
October	1st to 10th	Day	34% 4 10% 25% 25% 3	1941
	11th to 20th	Day	30% 3 11% 30% 20% 6%	1800
	21st to end	Day	37% 3 10% 28% 17% 4	1814
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	38% 5% 14% 26% 15% 3	2200
	11th to 20th	Night	40% 3 10% 25% 19% 3	1980
	21st to end	Night	47% 6% 13% 23% 10% 1	2178
April	1st to 10th	Night	39% 5% 14% 25% 16% 2	1863
	11th to 20th	Night	41% 5% 10% 26% 17% 2	1641
	21st to end	Night	40% 6% 13% 24% 16% 2	1620
May	1st to 10th	Night	39% 6% 16% 24% 15% 1	1620
	11th to 20th	Night	39% 7% 12% 26% 15% 1	1594
	21st to end	Night	42% 6% 18% 20% 12% 2	1719
June	1st to 10th	Night	25% 8% 18% 30% 16% 2	1440
	11th to 20th	Night	32% 6% 13% 28% 17% 5%	1417
	21st to end	Night	22% 6% 16% 34% 19% 4	1440
July	1st to 10th	Night	25% 6% 14% 33% 18% 3	1400
	11th to 20th	Night	21% 6% 14% 29% 22% 9%	1392
	21st to end	Night	22% 7% 16% 27% 23% 5%	1603
August	1st to 10th	Night	31% 8% 18% 27% 14% 2	1601
	11th to 20th	Night	27% 5% 12% 33% 19% 4	1600
	21st to end	Night	21% 6% 14% 28% 24% 7%	1821
September	1st to 10th	Night	26% 4 12% 27% 23% 7%	1894
	11th to 20th	Night	22% 5% 12% 36% 22% 3	1980
	21st to end	Night	25% 4 8% 31% 29% 2	1980
October	1st to 10th	Night	35% 4 10% 25% 24% 2	1999
	11th to 20th	Night	29% 4 8% 28% 26% 6%	2160
	21st to end	Night	33% 4 12% 23% 23% 5%	2539
November	1st to 10th	Night	29% 4 12% 27% 23% 5%	2405
	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	16% 13% 39% 25% 6% 2	255
	11th to 20th	Day	17% 9% 41% 24% 7% 2	240
	21st to end	Day	23% 14% 33% 19% 9% 1	264
April	1st to 10th	Day	21% 15% 41% 17% 5%	355
	11th to 20th	Day	25% 13% 35% 22% 4 1	546
	21st to end	Day	23% 12% 31% 24% 8% 2	600
May	1st to 10th	Day	19% 10% 34% 27% 8% 1	603
	11th to 20th	Day	23% 9% 28% 24% 13% 2	625
	21st to end	Day	20% 6% 31% 29% 12% 2	679
June	1st to 10th	Day	11% 6% 26% 35% 16% 7%	630
	11th to 20th	Day	11% 5% 33% 34% 14% 2	630
	21st to end	Day	9% 5% 32% 37% 16% 1	630
July	1st to 10th	Day	7% 3 22% 40% 24% 3	621
	11th to 20th	Day	7% 3 28% 42% 17% 3	618
	21st to end	Day	6% 3 27% 45% 17% 2	684
August	1st to 10th	Day	8% 3 26% 41% 19% 3	626
	11th to 20th	Day	11% 3 27% 39% 18% 3	615
	21st to end	Day	8% 4 29% 36% 19% 4	652
September	1st to 10th	Day	12% 3 34% 30% 16% 5%	356
	11th to 20th	Day	8% 6% 31% 31% 18% 6%	270
	21st to end	Day	19% 7% 33% 28% 11% 2	270
October	1st to 10th	Day	22% 5% 27% 28% 15% 3	270
	11th to 20th	Day	18% 13% 35% 25% 7% 2	270
	21st to end	Day	19% 15% 33% 24% 8% 2	297
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% 12% 42% 28% 4	716
	11th to 20th	Night	18% 9% 40% 27% 6%	540
	21st to end	Night	21% 9% 38% 25% 7% 1	594
April	1st to 10th	Night	19% 9% 41% 29% 2	540
	11th to 20th	Night	19% 13% 36% 27% 5%	533
	21st to end	Night	18% 11% 34% 29% 8%	540
May	1st to 10th	Night	16% 9% 35% 33% 8%	540
	11th to 20th	Night	18% 9% 34% 27% 11% 1	531
	21st to end	Night	18% 6% 35% 31% 10% 1	584
June	1st to 10th	Night	10% 5% 29% 41% 14% 2	540
	11th to 20th	Night	13% 5% 35% 36% 11%	540
	21st to end	Night	7% 3 26% 49% 14%	540
July	1st to 10th	Night	6% 3 24% 46% 20% 1	525
	11th to 20th	Night	5% 2 26% 54% 12% 1	522
	21st to end	Night	5% 2 27% 50% 15%	591
August	1st to 10th	Night	6% 3 24% 48% 18% 1	537
	11th to 20th	Night	9% 2 30% 43% 16% 1	534
	21st to end	Night	6% 2 33% 43% 16% 1	594
September	1st to 10th	Night	11% 5% 30% 40% 13% 1	540
	11th to 20th	Night	8% 4 33% 41% 11% 2	540
	21st to end	Night	12% 7% 36% 32% 12% 1	540
October	1st to 10th	Night	21% 7% 33% 29% 10% 1	559
	11th to 20th	Night	15% 13% 34% 30% 8%	720
	21st to end	Night	17% 9% 35% 30% 8%	955
November	1st to 10th	Night	10% 10% 41% 33% 6% 1	925
	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 2024-03-03 05:28:59. Version ac07

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