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 2025-04-26.

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% 48%	116817
	Night	9% 7% 2 7% 4 4 4 3 5% 7% 49%	120537
Transparency	Day	37% 5% 13% 26% 17% 3	116567
	Night	36% 4 12% 27% 18% 3	120377
Seeing	Day	15% 9% 33% 30% 12% 2	16431
	Night	13% 9% 37% 32% 8% 1	26505

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	9% 12% 5% 13% 8% 7% 4 3 3 5% 31%	3638
	11th to 20th	Day	5% 9% 4 11% 7% 5% 7% 6% 6% 5% 35%	3640
	21st to end	Day	3 7% 4 11% 6% 3 4 3 5% 5% 49%	4335
February	1st to 10th	Day	11% 12% 4 8% 6% 6% 5% 3 5% 7% 35%	1800
	11th to 20th	Day	8% 11% 4 9% 6% 4 3 2 4 6% 43%	1906
	21st to end	Day	10% 9% 4 7% 4 3 3 3 5% 5% 47%	1650
March	1st to 10th	Day	10% 8% 2 6% 4 3 3 2 4 5% 53%	4578
	11th to 20th	Day	8% 6% 3 5% 3 3 3 3 5% 8% 53%	4980
	21st to end	Day	19% 11% 3 9% 5% 4 4 3 5% 6% 30%	5464
April	1st to 10th	Day	14% 8% 2 7% 4 4 4 3 5% 7% 43%	2329
	11th to 20th	Day	18% 8% 2 6% 4 4 3 3 4 6% 42%	2521
	21st to end	Day	18% 7% 2 5% 3 3 4 4 6% 7% 40%	2536
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	9% 4 1 3 2 2 2 2 3 4 68%	3399
	11th to 20th	Day	8% 5% 2 3 3 3 3 3 4 7% 60%	3140
	21st to end	Day	10% 6% 2 7% 4 3 4 4 5% 6% 50%	3135
November	1st to 10th	Day	8% 7% 3 5% 4 4 4 3 6% 7% 49%	1763
	11th to 20th	Day	7% 7% 2 6% 6% 4 3 4 4 5% 51%	1800
	21st to end	Day	8% 10% 3 6% 4 4 3 3 6% 7% 47%	1732
December	1st to 10th	Day	5% 6% 4 9% 6% 6% 4 3 4 4 48%	2610
	11th to 20th	Day	5% 7% 4 8% 5% 5% 5% 4 5% 8% 43%	2735
	21st to end	Day	12% 11% 4 12% 4 4 4 3 4 6% 38%	4004
January	1st to 10th	Night	9% 11% 5% 14% 7% 7% 4 3 5% 6% 29%	6327
	11th to 20th	Night	3 10% 4 9% 6% 6% 8% 4 5% 6% 39%	6340
	21st to end	Night	3 6% 4 12% 5% 4 4 3 5% 5% 49%	6640
February	1st to 10th	Night	10% 10% 4 9% 5% 5% 4 3 6% 5% 38%	2600
	11th to 20th	Night	7% 11% 3 8% 4 4 4 3 4 7% 43%	2398
	21st to end	Night	9% 7% 2 6% 4 5% 5% 3 6% 6% 49%	1980
March	1st to 10th	Night	9% 7% 2 6% 4 3 3 3 4 6% 52%	5292
	11th to 20th	Night	10% 6% 2 4 3 3 4 3 5% 7% 53%	4980
	21st to end	Night	14% 12% 3 7% 5% 5% 5% 4 5% 7% 35%	5467
April	1st to 10th	Night	13% 8% 2 6% 4 3 4 3 5% 7% 45%	2069
	11th to 20th	Night	14% 8% 2 6% 4 3 3 3 6% 6% 44%	1825
	21st to end	Night	15% 7% 2 5% 4 4 3 3 5% 6% 43%	1760
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	9% 3 1 3 1 2 2 2 3 3 72%	3527
	11th to 20th	Night	8% 4 2 3 2 3 2 2 4 6% 64%	3779
	21st to end	Night	10% 6% 2 5% 3 3 4 4 5% 8% 50%	4419
November	1st to 10th	Night	7% 5% 3 5% 3 4 4 3 6% 7% 55%	2535
	11th to 20th	Night	7% 6% 1 6% 5% 4 4 3 5% 7% 51%	2600
	21st to end	Night	7% 7% 3 6% 4 3 3 4 5% 7% 51%	2663
December	1st to 10th	Night	5% 6% 3 7% 5% 4 4 3 5% 6% 53%	4580
	11th to 20th	Night	6% 9% 2 7% 4 4 5% 3 6% 7% 46%	5447
	21st to end	Night	12% 11% 4 11% 4 4 4 3 4 5% 38%	6974

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	58% 4 10% 18% 10%	3639
	11th to 20th	Day	49% 3 14% 18% 13% 2	3640
	21st to end	Day	39% 4 14% 25% 16% 3	4335
February	1st to 10th	Day	50% 5% 14% 19% 11% 1	1800
	11th to 20th	Day	45% 4 10% 22% 15% 3	1916
	21st to end	Day	40% 4 14% 22% 14% 5%	1650
March	1st to 10th	Day	35% 4 8% 27% 24% 3	4578
	11th to 20th	Day	31% 4 9% 27% 27% 2	4980
	21st to end	Day	54% 6% 15% 18% 6% 1	5464
April	1st to 10th	Day	42% 4 12% 26% 14% 2	2329
	11th to 20th	Day	44% 4 10% 23% 16% 3	2524
	21st to end	Day	42% 6% 13% 25% 14%	2536
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	22% 2 7% 19% 41% 9%	3399
	11th to 20th	Day	26% 2 15% 31% 20% 5%	3140
	21st to end	Day	36% 2 10% 32% 17% 3	3135
November	1st to 10th	Day	34% 5% 15% 24% 20% 3	1763
	11th to 20th	Day	35% 4 12% 28% 17% 4	1800
	21st to end	Day	38% 4 13% 26% 16% 4	1732
December	1st to 10th	Day	40% 3 16% 26% 13% 2	2610
	11th to 20th	Day	39% 4 18% 24% 14% 1	2732
	21st to end	Day	50% 3 9% 29% 9% 1	4004
January	1st to 10th	Night	56% 4 9% 20% 10% 1	6327
	11th to 20th	Night	46% 4 12% 23% 14% 1	6340
	21st to end	Night	38% 5% 13% 27% 16% 1	6640
February	1st to 10th	Night	47% 5% 15% 18% 13% 2	2600
	11th to 20th	Night	42% 4 13% 23% 14% 4	2398
	21st to end	Night	35% 5% 11% 28% 15% 5%	1980
March	1st to 10th	Night	33% 3 9% 28% 23% 3	5292
	11th to 20th	Night	32% 3 8% 25% 29% 4	4980
	21st to end	Night	47% 8% 13% 24% 7% 1	5467
April	1st to 10th	Night	39% 4 14% 26% 16% 2	2069
	11th to 20th	Night	39% 4 10% 26% 18% 2	1825
	21st to end	Night	40% 6% 12% 24% 16% 1	1760
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	20% 2 6% 17% 49% 6%	3527
	11th to 20th	Night	24% 2 9% 31% 25% 9%	3779
	21st to end	Night	33% 3 13% 28% 20% 3	4419
November	1st to 10th	Night	30% 4 13% 27% 22% 5%	2535
	11th to 20th	Night	32% 5% 12% 25% 22% 5%	2600
	21st to end	Night	33% 4 14% 30% 18% 3	2663
December	1st to 10th	Night	34% 3 14% 32% 16% 1	4580
	11th to 20th	Night	37% 4 14% 34% 11% 1	5449
	21st to end	Night	50% 3 10% 26% 10% 1	6974

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	18% 12% 29% 29% 11% 2	300
	11th to 20th	Day	13% 16% 36% 28% 7%	300
	21st to end	Day	15% 11% 45% 20% 7% 2	330
February	1st to 10th	Day	18% 15% 42% 21% 4	300
	11th to 20th	Day	14% 14% 41% 23% 6% 2	300
	21st to end	Day	17% 14% 45% 20% 3	249
March	1st to 10th	Day	16% 12% 40% 25% 6% 1	300
	11th to 20th	Day	15% 13% 39% 23% 7% 2	300
	21st to end	Day	25% 13% 33% 20% 8% 1	330
April	1st to 10th	Day	22% 14% 41% 17% 6%	429
	11th to 20th	Day	24% 15% 35% 22% 4 1	642
	21st to end	Day	24% 12% 30% 24% 8% 2	676
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% 34% 24% 8% 2	330
November	1st to 10th	Day	17% 11% 36% 23% 9% 4	300
	11th to 20th	Day	15% 13% 45% 21% 6%	300
	21st to end	Day	16% 13% 37% 25% 7% 2	300
December	1st to 10th	Day	13% 13% 41% 25% 7% 1	300
	11th to 20th	Day	15% 11% 42% 23% 7% 1	300
	21st to end	Day	21% 10% 43% 20% 5% 1	330
January	1st to 10th	Night	13% 11% 41% 28% 7% 1	1000
	11th to 20th	Night	10% 13% 43% 29% 4 1	1000
	21st to end	Night	12% 8% 46% 26% 7%	1100
February	1st to 10th	Night	16% 13% 41% 27% 4	1000
	11th to 20th	Night	14% 12% 42% 27% 5%	843
	21st to end	Night	12% 11% 41% 29% 5% 1	660
March	1st to 10th	Night	15% 11% 42% 28% 4	770
	11th to 20th	Night	17% 10% 41% 27% 6%	600
	21st to end	Night	22% 9% 39% 24% 6%	660
April	1st to 10th	Night	19% 9% 41% 29% 2	600
	11th to 20th	Night	19% 13% 38% 26% 4	593
	21st to end	Night	18% 10% 35% 28% 8%	587
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	975
	11th to 20th	Night	12% 14% 39% 28% 7% 1	1000
	21st to end	Night	12% 10% 39% 30% 9%	1000
December	1st to 10th	Night	13% 15% 42% 26% 5%	1000
	11th to 20th	Night	14% 10% 41% 27% 8%	1000
	21st to end	Night	18% 14% 36% 26% 6%	1100

Page generated at 2025-04-23 08:25:07. Version ac07

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