Village Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Village Creek State Park clear sky chart from 2005-11-06 to 2026-02-16.

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	12% 6% 2 6% 4 4 4 3 5% 7% 45%	130500
	Night	13% 6% 2 5% 4 4 4 3 5% 7% 49%	130571
Transparency	Day	37% 5% 10% 25% 19% 4	134102
	Night	35% 4 9% 24% 21% 7%	135047
Seeing	Day	15% 10% 23% 25% 19% 8%	17024
	Night	15% 8% 26% 31% 17% 3	26915

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% 9% 4 9% 3 2 2 2 3 5% 44%	5148
	11th to 20th	Day	13% 7% 2 6% 3 3 3 2 3 4 55%	5310
	21st to end	Day	20% 7% 2 6% 4 2 2 2 3 4 48%	5812
February	1st to 10th	Day	21% 8% 3 7% 4 3 3 3 4 6% 40%	1964
	11th to 20th	Day	19% 8% 3 7% 4 4 3 2 3 5% 40%	1998
	21st to end	Day	22% 8% 3 7% 3 3 4 3 4 5% 38%	1650
March	1st to 10th	Day	18% 13% 4 8% 4 3 3 3 4 5% 35%	4700
	11th to 20th	Day	11% 6% 2 5% 4 4 3 3 4 5% 52%	4980
	21st to end	Day	13% 8% 3 8% 4 4 4 3 4 6% 42%	5691
April	1st to 10th	Day	13% 7% 2 6% 4 4 4 4 5% 6% 45%	2400
	11th to 20th	Day	14% 7% 2 6% 4 3 4 3 5% 7% 46%	2374
	21st to end	Day	14% 7% 2 7% 5% 4 4 4 6% 7% 41%	2400
May	1st to 10th	Day	15% 8% 3 7% 4 5% 5% 4 7% 8% 34%	5405
	11th to 20th	Day	13% 7% 3 7% 5% 5% 5% 5% 7% 9% 35%	5554
	21st to end	Day	16% 7% 3 7% 5% 5% 5% 4 6% 7% 34%	6935
June	1st to 10th	Day	7% 5% 2 5% 5% 6% 7% 5% 8% 10% 43%	2800
	11th to 20th	Day	5% 4 2 6% 4 5% 5% 5% 8% 11% 46%	2800
	21st to end	Day	4 3 2 5% 5% 5% 5% 5% 7% 10% 49%	2800
July	1st to 10th	Day	6% 5% 2 6% 5% 6% 6% 5% 8% 10% 41%	6322
	11th to 20th	Day	5% 3 1 5% 4 4 5% 4 8% 13% 47%	5900
	21st to end	Day	10% 6% 2 6% 4 4 5% 4 7% 11% 41%	6422
August	1st to 10th	Day	3 2 1 4 3 3 5% 4 6% 9% 60%	4045
	11th to 20th	Day	7% 4 2 7% 4 4 6% 4 7% 10% 46%	3849
	21st to end	Day	5% 4 2 5% 4 4 5% 4 6% 9% 52%	4312
September	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 4 7% 8% 44%	2400
	11th to 20th	Day	12% 5% 2 6% 4 4 4 4 5% 8% 46%	2382
	21st to end	Day	9% 5% 2 5% 4 4 5% 4 5% 6% 53%	2195
October	1st to 10th	Day	7% 3 2 5% 4 4 4 2 4 6% 60%	2000
	11th to 20th	Day	12% 4 1 4 3 3 3 3 4 6% 57%	2000
	21st to end	Day	19% 6% 2 4 2 3 3 2 4 5% 51%	2200
November	1st to 10th	Day	12% 7% 2 4 4 2 2 3 4 4 57%	1974
	11th to 20th	Day	11% 5% 2 4 3 4 3 3 6% 6% 54%	1890
	21st to end	Day	18% 8% 2 6% 3 3 3 3 5% 7% 44%	1890
December	1st to 10th	Day	17% 9% 2 6% 3 3 3 2 4 4 47%	2840
	11th to 20th	Day	19% 8% 3 6% 4 3 3 2 4 4 44%	3088
	21st to end	Day	16% 9% 4 8% 4 4 4 3 5% 5% 38%	4070
January	1st to 10th	Night	18% 7% 3 6% 4 3 3 2 3 5% 46%	7771
	11th to 20th	Night	13% 5% 2 4 3 3 3 2 3 4 59%	7680
	21st to end	Night	21% 7% 2 6% 3 3 3 2 3 5% 43%	8402
February	1st to 10th	Night	20% 7% 3 6% 3 3 3 3 5% 5% 41%	2654
	11th to 20th	Night	20% 8% 3 6% 3 3 3 2 3 5% 43%	2399
	21st to end	Night	19% 7% 2 5% 4 4 3 2 3 6% 44%	1980
March	1st to 10th	Night	17% 8% 2 6% 4 4 3 3 4 4 43%	5196
	11th to 20th	Night	10% 6% 2 5% 4 4 4 3 5% 7% 51%	4980
	21st to end	Night	13% 6% 2 7% 4 4 4 4 5% 7% 45%	5238
April	1st to 10th	Night	12% 6% 2 5% 4 3 4 4 5% 7% 48%	2000
	11th to 20th	Night	13% 5% 2 4 4 3 3 3 4 7% 51%	1975
	21st to end	Night	13% 5% 3 6% 3 4 4 3 4 7% 48%	2000
May	1st to 10th	Night	20% 8% 2 6% 3 3 4 3 5% 8% 38%	4490
	11th to 20th	Night	18% 9% 3 7% 5% 4 4 3 5% 5% 37%	4318
	21st to end	Night	13% 7% 3 7% 5% 4 5% 4 6% 8% 37%	3942
June	1st to 10th	Night	6% 5% 2 4 4 4 5% 5% 7% 10% 48%	1600
	11th to 20th	Night	2 4 1 4 4 4 4 4 7% 9% 58%	1600
	21st to end	Night	3 3 1 4 4 3 5% 4 5% 11% 58%	1600
July	1st to 10th	Night	5% 4 1 5% 4 4 5% 5% 8% 11% 46%	3651
	11th to 20th	Night	4 2 1 4 3 4 4 4 7% 13% 53%	4077
	21st to end	Night	8% 6% 2 6% 4 4 4 4 5% 10% 46%	4449
August	1st to 10th	Night	2 2 1 3 3 2 3 2 5% 9% 68%	3107
	11th to 20th	Night	4 2 2 4 4 4 4 4 7% 10% 55%	3200
	21st to end	Night	4 3 1 4 4 4 4 4 6% 9% 58%	3586
September	1st to 10th	Night	7% 4 2 5% 4 3 4 3 5% 8% 55%	2000
	11th to 20th	Night	10% 6% 1 4 4 3 4 3 6% 8% 51%	2000
	21st to end	Night	7% 5% 2 5% 3 4 3 3 5% 6% 56%	2196
October	1st to 10th	Night	7% 3 1 4 2 2 3 3 4 7% 63%	2400
	11th to 20th	Night	10% 4 2 4 3 2 3 2 3 5% 61%	2400
	21st to end	Night	17% 5% 2 4 3 3 3 2 3 4 54%	2640
November	1st to 10th	Night	11% 5% 2 4 3 3 4 3 4 5% 56%	2541
	11th to 20th	Night	11% 5% 2 4 3 3 3 3 5% 6% 56%	2730
	21st to end	Night	14% 6% 2 4 3 3 3 3 4 6% 50%	2730
December	1st to 10th	Night	17% 7% 2 5% 3 3 3 2 4 5% 50%	4550
	11th to 20th	Night	18% 8% 3 6% 3 4 3 2 4 4 45%	5339
	21st to end	Night	19% 7% 2 7% 4 5% 4 3 5% 6% 39%	7150

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	46% 2 9% 29% 13% 2	5149
	11th to 20th	Day	35% 3 5% 23% 30% 4	5310
	21st to end	Day	42% 2 5% 19% 25% 7%	5812
February	1st to 10th	Day	48% 3 10% 22% 16% 2	1964
	11th to 20th	Day	49% 3 7% 19% 17% 5%	2008
	21st to end	Day	50% 3 7% 16% 18% 7%	1650
March	1st to 10th	Day	52% 3 6% 16% 13% 10%	4700
	11th to 20th	Day	35% 4 6% 24% 21% 10%	4980
	21st to end	Day	43% 3 8% 25% 19% 1	5693
April	1st to 10th	Day	39% 6% 8% 24% 20% 3	2400
	11th to 20th	Day	38% 5% 9% 24% 17% 6%	2374
	21st to end	Day	41% 6% 10% 24% 19% 1	2400
May	1st to 10th	Day	46% 7% 11% 23% 12% 1	5440
	11th to 20th	Day	43% 7% 17% 21% 11% 1	5558
	21st to end	Day	46% 7% 10% 21% 14% 2	6949
June	1st to 10th	Day	33% 8% 13% 25% 18% 2	2800
	11th to 20th	Day	30% 7% 13% 29% 17% 4	2800
	21st to end	Day	27% 8% 15% 26% 20% 4	2800
July	1st to 10th	Day	35% 8% 14% 25% 17% 1	6253
	11th to 20th	Day	26% 7% 20% 36% 9% 2	5831
	21st to end	Day	36% 6% 18% 31% 9%	6240
August	1st to 10th	Day	20% 6% 17% 33% 22% 3	4031
	11th to 20th	Day	33% 6% 16% 29% 14% 2	3885
	21st to end	Day	28% 6% 12% 30% 21% 3	4311
September	1st to 10th	Day	34% 7% 12% 24% 17% 6%	2400
	11th to 20th	Day	36% 5% 10% 21% 22% 5%	2382
	21st to end	Day	32% 5% 9% 21% 25% 8%	2195
October	1st to 10th	Day	16% 3 6% 15% 37% 24%	3260
	11th to 20th	Day	18% 3 3 22% 39% 14%	3240
	21st to end	Day	29% 2 3 30% 29% 8%	3538
November	1st to 10th	Day	33% 3 6% 25% 24% 8%	1974
	11th to 20th	Day	31% 4 8% 24% 25% 8%	1890
	21st to end	Day	41% 3 7% 20% 23% 5%	1890
December	1st to 10th	Day	42% 2 6% 26% 21% 3	2840
	11th to 20th	Day	45% 3 6% 24% 18% 4	3085
	21st to end	Day	47% 5% 7% 27% 12% 3	4070
January	1st to 10th	Night	43% 3 8% 28% 15% 3	7772
	11th to 20th	Night	31% 3 5% 20% 33% 8%	7680
	21st to end	Night	45% 3 6% 20% 20% 5%	8402
February	1st to 10th	Night	45% 4 8% 21% 19% 4	2654
	11th to 20th	Night	45% 3 7% 22% 17% 6%	2400
	21st to end	Night	43% 4 6% 17% 22% 8%	1980
March	1st to 10th	Night	45% 3 5% 15% 20% 11%	5196
	11th to 20th	Night	33% 5% 8% 23% 18% 14%	4980
	21st to end	Night	39% 4 9% 25% 20% 3	5238
April	1st to 10th	Night	35% 5% 10% 24% 20% 6%	2000
	11th to 20th	Night	34% 3 8% 25% 22% 8%	1975
	21st to end	Night	37% 5% 10% 24% 23% 3	2000
May	1st to 10th	Night	46% 5% 13% 22% 12% 2	4520
	11th to 20th	Night	48% 5% 13% 22% 11% 1	4319
	21st to end	Night	44% 7% 11% 21% 14% 3	3950
June	1st to 10th	Night	29% 8% 14% 25% 22% 3	1600
	11th to 20th	Night	21% 5% 14% 29% 25% 6%	1600
	21st to end	Night	21% 7% 15% 31% 21% 6%	1600
July	1st to 10th	Night	29% 7% 18% 23% 22% 2	3613
	11th to 20th	Night	21% 6% 22% 35% 14% 3	4026
	21st to end	Night	33% 5% 18% 30% 13%	4320
August	1st to 10th	Night	14% 4 12% 41% 25% 2	3097
	11th to 20th	Night	23% 7% 20% 31% 18% 2	3230
	21st to end	Night	23% 5% 11% 28% 29% 4	3586
September	1st to 10th	Night	28% 6% 9% 27% 21% 9%	2000
	11th to 20th	Night	31% 6% 10% 22% 26% 6%	2000
	21st to end	Night	29% 5% 8% 22% 27% 10%	2196
October	1st to 10th	Night	13% 3 5% 20% 31% 28%	3920
	11th to 20th	Night	17% 3 3 16% 35% 26%	3899
	21st to end	Night	26% 3 4 24% 28% 14%	4252
November	1st to 10th	Night	31% 3 6% 24% 26% 9%	2541
	11th to 20th	Night	29% 3 7% 24% 26% 10%	2730
	21st to end	Night	36% 4 7% 22% 26% 5%	2730
December	1st to 10th	Night	38% 3 7% 29% 20% 3	4550
	11th to 20th	Night	43% 3 6% 23% 21% 4	5341
	21st to end	Night	47% 5% 8% 23% 14% 3	7150

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	28% 18% 35% 15% 3 2	330
	11th to 20th	Day	25% 24% 37% 12% 2	330
	21st to end	Day	21% 25% 39% 12% 3	363
February	1st to 10th	Day	27% 20% 34% 15% 4 1	330
	11th to 20th	Day	34% 24% 30% 9% 2	315
	21st to end	Day	34% 24% 30% 10% 2	249
March	1st to 10th	Day	29% 20% 31% 15% 4 1	300
	11th to 20th	Day	27% 22% 35% 15% 1	300
	21st to end	Day	25% 18% 36% 16% 5%	430
April	1st to 10th	Day	19% 18% 33% 21% 8% 1	500
	11th to 20th	Day	21% 16% 33% 20% 8% 1	492
	21st to end	Day	18% 14% 33% 23% 11% 2	500
May	1st to 10th	Day	17% 15% 31% 27% 10% 1	503
	11th to 20th	Day	14% 8% 29% 28% 15% 7%	532
	21st to end	Day	10% 6% 24% 30% 21% 9%	789
June	1st to 10th	Day	9% 4 21% 28% 23% 15%	730
	11th to 20th	Day	6% 3 15% 40% 26% 11%	730
	21st to end	Day	6% 2 17% 34% 29% 12%	730
July	1st to 10th	Day	5% 2 13% 28% 32% 19%	721
	11th to 20th	Day	6% 1 12% 32% 32% 17%	718
	21st to end	Day	7% 2 8% 32% 35% 15%	794
August	1st to 10th	Day	6% 2 11% 33% 35% 12%	615
	11th to 20th	Day	12% 3 8% 32% 30% 14%	519
	21st to end	Day	10% 2 9% 26% 31% 23%	583
September	1st to 10th	Day	9% 2 11% 30% 36% 13%	530
	11th to 20th	Day	10% 3 12% 22% 31% 21%	530
	21st to end	Day	13% 6% 15% 32% 25% 9%	525
October	1st to 10th	Day	9% 6% 21% 34% 25% 6%	330
	11th to 20th	Day	12% 11% 33% 26% 14% 5%	330
	21st to end	Day	25% 11% 32% 20% 9% 2	363
November	1st to 10th	Day	18% 12% 28% 28% 12% 2	330
	11th to 20th	Day	10% 17% 38% 25% 9% 1	330
	21st to end	Day	24% 18% 31% 18% 8% 2	330
December	1st to 10th	Day	24% 21% 30% 19% 5% 2	330
	11th to 20th	Day	27% 19% 29% 17% 8% 1	330
	21st to end	Day	25% 20% 35% 16% 2 1	363
January	1st to 10th	Night	24% 11% 38% 22% 5%	1050
	11th to 20th	Night	22% 15% 37% 22% 3	1050
	21st to end	Night	20% 15% 37% 25% 3	1155
February	1st to 10th	Night	25% 12% 34% 25% 3	974
	11th to 20th	Night	23% 16% 37% 21% 3	804
	21st to end	Night	25% 16% 33% 23% 3	660
March	1st to 10th	Night	20% 12% 34% 28% 6%	727
	11th to 20th	Night	19% 14% 38% 25% 5% 1	600
	21st to end	Night	19% 11% 35% 28% 7%	660
April	1st to 10th	Night	14% 13% 42% 23% 8%	600
	11th to 20th	Night	16% 10% 33% 29% 11% 1	593
	21st to end	Night	15% 8% 37% 29% 9% 2	600
May	1st to 10th	Night	17% 7% 25% 38% 11% 2	600
	11th to 20th	Night	15% 6% 28% 33% 16% 2	591
	21st to end	Night	8% 4 22% 38% 24% 4	650
June	1st to 10th	Night	8% 2 16% 38% 31% 6%	600
	11th to 20th	Night	4 2 13% 46% 34% 3	600
	21st to end	Night	5% 2 12% 38% 39% 6%	600
July	1st to 10th	Night	3 2 9% 35% 41% 10%	585
	11th to 20th	Night	7% 1 8% 30% 45% 10%	582
	21st to end	Night	6% 1 6% 33% 43% 10%	657
August	1st to 10th	Night	5% 1 6% 34% 45% 9%	597
	11th to 20th	Night	6% 2 10% 36% 39% 8%	594
	21st to end	Night	7% 2 8% 28% 47% 9%	660
September	1st to 10th	Night	9% 2 10% 37% 38% 6%	600
	11th to 20th	Night	12% 2 12% 31% 38% 6%	600
	21st to end	Night	9% 3 16% 38% 30% 4	796
October	1st to 10th	Night	8% 5% 18% 36% 28% 5%	800
	11th to 20th	Night	11% 6% 26% 36% 18% 2	800
	21st to end	Night	19% 9% 25% 32% 14% 1	880
November	1st to 10th	Night	13% 8% 28% 35% 15% 1	820
	11th to 20th	Night	13% 9% 36% 32% 10%	840
	21st to end	Night	17% 11% 33% 28% 10% 1	840
December	1st to 10th	Night	21% 11% 32% 31% 5%	945
	11th to 20th	Night	22% 12% 30% 30% 6%	1050
	21st to end	Night	24% 12% 32% 26% 5%	1155

Page generated at 2026-02-13 00:42:16. Version ac07

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