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 2025-12-18.

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	14% 6% 2 7% 5% 5% 5% 4 6% 8% 38%	126859
	Night	15% 7% 2 5% 4 4 4 3 5% 7% 44%	124406
Transparency	Day	43% 4 11% 19% 16% 7%	130466
	Night	40% 3 12% 20% 17% 8%	128875
Seeing	Day	14% 9% 20% 25% 21% 10%	16362
	Night	16% 6% 22% 31% 22% 3	26181

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	21% 10% 3 6% 3 3 2 3 4 4 41%	4077
	11th to 20th	Day	16% 6% 2 6% 4 4 3 2 3 5% 50%	4080
	21st to end	Day	28% 8% 3 6% 4 3 3 2 4 5% 35%	4488
February	1st to 10th	Day	22% 8% 3 6% 6% 4 4 3 5% 5% 35%	1800
	11th to 20th	Day	24% 9% 2 6% 4 3 3 3 4 4 38%	2028
	21st to end	Day	24% 8% 3 6% 5% 3 3 2 4 5% 36%	1815
March	1st to 10th	Day	22% 8% 3 7% 5% 5% 4 4 5% 5% 33%	4936
	11th to 20th	Day	15% 6% 2 7% 4 4 4 3 4 6% 44%	4980
	21st to end	Day	19% 8% 3 7% 4 4 4 3 4 6% 37%	5462
April	1st to 10th	Day	16% 7% 3 7% 5% 5% 5% 4 5% 6% 38%	2248
	11th to 20th	Day	18% 7% 2 6% 5% 4 5% 4 5% 7% 37%	2374
	21st to end	Day	12% 6% 3 7% 5% 5% 4 4 6% 8% 41%	2400
May	1st to 10th	Day	18% 7% 3 8% 6% 5% 6% 5% 6% 7% 28%	5405
	11th to 20th	Day	11% 5% 2 7% 4 4 5% 4 6% 8% 43%	5667
	21st to end	Day	9% 6% 3 7% 6% 6% 6% 5% 7% 10% 34%	6434
June	1st to 10th	Day	7% 5% 3 7% 7% 6% 7% 6% 8% 9% 35%	2600
	11th to 20th	Day	6% 6% 2 7% 6% 7% 8% 6% 8% 10% 34%	2600
	21st to end	Day	8% 6% 3 8% 6% 8% 9% 7% 9% 10% 28%	2600
July	1st to 10th	Day	7% 6% 3 8% 6% 8% 7% 6% 9% 12% 27%	5900
	11th to 20th	Day	7% 6% 3 9% 7% 7% 7% 6% 9% 12% 26%	5900
	21st to end	Day	12% 7% 2 8% 6% 6% 6% 5% 7% 10% 31%	6422
August	1st to 10th	Day	2 2 1 5% 4 4 5% 4 7% 10% 56%	4234
	11th to 20th	Day	3 3 1 4 5% 5% 7% 6% 9% 12% 45%	3854
	21st to end	Day	10% 6% 2 8% 6% 7% 7% 5% 6% 8% 35%	4312
September	1st to 10th	Day	10% 5% 2 8% 5% 6% 6% 5% 6% 9% 37%	2347
	11th to 20th	Day	14% 6% 2 7% 5% 5% 6% 5% 7% 9% 35%	2200
	21st to end	Day	10% 5% 2 6% 5% 5% 4 4 6% 7% 45%	2195
October	1st to 10th	Day	6% 4 2 5% 4 4 4 3 5% 6% 56%	2000
	11th to 20th	Day	9% 5% 2 5% 4 4 3 4 5% 7% 54%	2000
	21st to end	Day	13% 5% 2 5% 3 3 3 3 5% 6% 53%	2200
November	1st to 10th	Day	12% 6% 2 6% 4 5% 5% 4 5% 6% 46%	2058
	11th to 20th	Day	13% 6% 2 6% 5% 3 4 3 4 6% 48%	2100
	21st to end	Day	16% 8% 2 6% 5% 4 4 2 4 5% 43%	2100
December	1st to 10th	Day	22% 9% 2 5% 3 3 3 3 4 6% 39%	3101
	11th to 20th	Day	15% 9% 4 7% 4 4 5% 3 4 6% 40%	3454
	21st to end	Day	17% 7% 2 6% 3 3 3 3 5% 6% 46%	4488
January	1st to 10th	Night	18% 8% 2 5% 3 3 3 2 4 6% 46%	5888
	11th to 20th	Night	19% 9% 2 5% 3 3 2 2 3 4 48%	5900
	21st to end	Night	29% 10% 2 5% 4 3 3 2 4 6% 32%	6490
February	1st to 10th	Night	20% 9% 4 5% 4 3 3 3 4 6% 39%	2600
	11th to 20th	Night	23% 9% 3 5% 3 3 2 2 4 5% 42%	2274
	21st to end	Night	24% 8% 2 6% 3 4 4 3 5% 5% 36%	1815
March	1st to 10th	Night	22% 12% 3 6% 4 3 3 3 4 5% 37%	4919
	11th to 20th	Night	21% 8% 2 6% 4 3 3 2 4 4 42%	4980
	21st to end	Night	21% 9% 2 6% 3 4 3 3 4 5% 41%	5467
April	1st to 10th	Night	18% 8% 2 6% 4 4 3 3 5% 7% 40%	2150
	11th to 20th	Night	18% 5% 1 5% 4 3 3 3 6% 8% 44%	1975
	21st to end	Night	15% 8% 2 5% 4 4 4 3 5% 6% 44%	2000
May	1st to 10th	Night	25% 9% 3 7% 4 4 4 4 6% 8% 26%	4490
	11th to 20th	Night	17% 7% 3 7% 4 4 4 3 5% 6% 41%	4235
	21st to end	Night	15% 8% 3 7% 4 5% 5% 4 7% 10% 32%	4443
June	1st to 10th	Night	6% 4 1 4 3 4 4 4 7% 10% 53%	1800
	11th to 20th	Night	5% 3 2 4 3 3 5% 4 7% 13% 52%	1800
	21st to end	Night	7% 5% 2 4 4 5% 5% 5% 8% 12% 43%	1800
July	1st to 10th	Night	5% 5% 2 6% 4 5% 5% 5% 7% 15% 41%	4078
	11th to 20th	Night	3 5% 2 6% 5% 5% 5% 4 7% 11% 47%	4077
	21st to end	Night	7% 6% 3 7% 5% 5% 5% 4 6% 10% 43%	4449
August	1st to 10th	Night	2 2 1 3 2 3 4 3 6% 11% 64%	2926
	11th to 20th	Night	2 2 1 2 2 3 4 4 6% 13% 61%	3192
	21st to end	Night	7% 4 2 6% 4 4 6% 5% 8% 11% 43%	3586
September	1st to 10th	Night	7% 5% 2 6% 4 4 5% 4 7% 10% 46%	2047
	11th to 20th	Night	11% 5% 2 6% 4 5% 5% 4 6% 8% 43%	2200
	21st to end	Night	8% 4 2 5% 3 3 4 3 4 6% 57%	2200
October	1st to 10th	Night	6% 3 1 4 4 3 4 3 5% 6% 61%	2385
	11th to 20th	Night	10% 3 2 3 2 3 3 3 4 6% 61%	2400
	21st to end	Night	12% 5% 2 4 2 2 2 2 3 5% 60%	2640
November	1st to 10th	Night	10% 6% 2 5% 3 3 4 3 5% 6% 53%	2460
	11th to 20th	Night	11% 5% 1 4 3 3 3 3 5% 6% 55%	2520
	21st to end	Night	15% 7% 2 7% 5% 3 3 3 5% 5% 45%	2520
December	1st to 10th	Night	22% 10% 3 7% 4 3 3 2 4 5% 36%	4302
	11th to 20th	Night	15% 11% 3 6% 4 3 3 2 5% 5% 42%	4908
	21st to end	Night	17% 7% 2 5% 4 3 3 3 4 5% 46%	6490

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	48% 2 3 21% 19% 6%	4078
	11th to 20th	Day	40% 2 4 16% 28% 11%	4080
	21st to end	Day	54% 1 3 15% 15% 12%	4488
February	1st to 10th	Day	52% 2 5% 14% 16% 10%	1800
	11th to 20th	Day	51% 3 5% 14% 17% 10%	2038
	21st to end	Day	52% 3 7% 14% 16% 9%	1815
March	1st to 10th	Day	54% 2 7% 10% 17% 11%	4936
	11th to 20th	Day	43% 2 7% 11% 21% 16%	4980
	21st to end	Day	49% 2 7% 20% 18% 4	5464
April	1st to 10th	Day	47% 4 8% 15% 16% 9%	2248
	11th to 20th	Day	46% 4 8% 16% 16% 10%	2374
	21st to end	Day	42% 4 9% 18% 22% 5%	2400
May	1st to 10th	Day	55% 2 9% 21% 10% 3	5440
	11th to 20th	Day	40% 3 12% 23% 20% 2	5671
	21st to end	Day	44% 3 12% 28% 10% 2	6447
June	1st to 10th	Day	43% 6% 15% 21% 15% 1	2600
	11th to 20th	Day	40% 8% 12% 24% 14% 2	2600
	21st to end	Day	46% 9% 18% 19% 8%	2600
July	1st to 10th	Day	47% 4 27% 19% 3	5836
	11th to 20th	Day	48% 5% 26% 17% 3	5831
	21st to end	Day	47% 6% 18% 24% 4	6240
August	1st to 10th	Day	24% 5% 13% 37% 21%	4220
	11th to 20th	Day	29% 5% 32% 29% 4 1	3890
	21st to end	Day	46% 7% 13% 18% 14% 1	4311
September	1st to 10th	Day	42% 8% 14% 17% 15% 4	2347
	11th to 20th	Day	44% 6% 13% 18% 15% 5%	2200
	21st to end	Day	37% 5% 11% 21% 16% 10%	2195
October	1st to 10th	Day	23% 3 6% 13% 19% 36%	3260
	11th to 20th	Day	21% 2 4 20% 35% 19%	3240
	21st to end	Day	29% 1 4 12% 41% 13%	3538
November	1st to 10th	Day	38% 4 7% 19% 20% 11%	2058
	11th to 20th	Day	38% 2 7% 17% 22% 14%	2100
	21st to end	Day	44% 2 6% 19% 20% 8%	2100
December	1st to 10th	Day	49% 2 5% 16% 23% 5%	3101
	11th to 20th	Day	47% 2 6% 14% 21% 11%	3452
	21st to end	Day	42% 2 5% 17% 24% 10%	4488
January	1st to 10th	Night	42% 2 5% 22% 22% 7%	5888
	11th to 20th	Night	43% 1 3 17% 26% 10%	5900
	21st to end	Night	56% 1 3 13% 15% 11%	6490
February	1st to 10th	Night	48% 3 7% 12% 18% 12%	2600
	11th to 20th	Night	48% 3 6% 15% 19% 10%	2274
	21st to end	Night	50% 3 7% 13% 14% 12%	1815
March	1st to 10th	Night	53% 2 5% 12% 17% 10%	4919
	11th to 20th	Night	48% 2 7% 13% 14% 16%	4980
	21st to end	Night	49% 2 8% 15% 20% 7%	5467
April	1st to 10th	Night	45% 4 8% 18% 15% 10%	2150
	11th to 20th	Night	39% 4 10% 19% 16% 12%	1975
	21st to end	Night	41% 4 9% 20% 21% 6%	2000
May	1st to 10th	Night	57% 3 10% 17% 9% 3	4520
	11th to 20th	Night	44% 3 11% 20% 20% 2	4236
	21st to end	Night	46% 4 19% 23% 8% 1	4452
June	1st to 10th	Night	25% 6% 21% 32% 15% 1	1800
	11th to 20th	Night	24% 7% 20% 32% 15% 2	1800
	21st to end	Night	32% 9% 24% 26% 9%	1800
July	1st to 10th	Night	34% 4 38% 22% 2	4035
	11th to 20th	Night	32% 5% 34% 26% 3	4026
	21st to end	Night	38% 7% 21% 29% 6%	4320
August	1st to 10th	Night	16% 4 19% 41% 19%	2916
	11th to 20th	Night	16% 5% 36% 36% 6%	3222
	21st to end	Night	34% 11% 20% 21% 13% 1	3586
September	1st to 10th	Night	30% 9% 21% 22% 14% 4	2047
	11th to 20th	Night	37% 6% 17% 19% 15% 5%	2200
	21st to end	Night	29% 5% 12% 25% 17% 12%	2200
October	1st to 10th	Night	20% 2 6% 16% 19% 37%	3905
	11th to 20th	Night	16% 3 4 25% 30% 22%	3899
	21st to end	Night	23% 1 5% 13% 41% 17%	4252
November	1st to 10th	Night	33% 3 11% 19% 23% 12%	2460
	11th to 20th	Night	31% 3 9% 20% 24% 13%	2520
	21st to end	Night	41% 3 8% 18% 19% 11%	2520
December	1st to 10th	Night	53% 2 5% 17% 18% 6%	4302
	11th to 20th	Night	46% 2 6% 13% 21% 12%	4909
	21st to end	Night	43% 2 6% 15% 26% 9%	6490

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	27% 15% 38% 13% 7% 1	300
	11th to 20th	Day	21% 20% 33% 21% 5% 1	300
	21st to end	Day	25% 22% 31% 19% 3	330
February	1st to 10th	Day	28% 16% 33% 17% 4	300
	11th to 20th	Day	38% 16% 27% 17% 3	300
	21st to end	Day	31% 26% 28% 12% 2	249
March	1st to 10th	Day	27% 21% 32% 15% 5%	300
	11th to 20th	Day	19% 27% 38% 13% 3	300
	21st to end	Day	25% 19% 35% 16% 5% 1	330
April	1st to 10th	Day	19% 21% 32% 24% 5%	348
	11th to 20th	Day	24% 18% 26% 20% 11% 1	492
	21st to end	Day	17% 12% 32% 26% 11% 1	500
May	1st to 10th	Day	20% 11% 31% 24% 13% 1	503
	11th to 20th	Day	13% 10% 26% 31% 17% 3	634
	21st to end	Day	10% 7% 28% 33% 17% 5%	789
June	1st to 10th	Day	7% 3 17% 34% 28% 12%	730
	11th to 20th	Day	8% 4 16% 35% 28% 10%	730
	21st to end	Day	10% 3 12% 26% 31% 18%	730
July	1st to 10th	Day	8% 2 8% 27% 36% 20%	721
	11th to 20th	Day	7% 1 7% 26% 37% 22%	718
	21st to end	Day	8% 3 5% 25% 36% 23%	794
August	1st to 10th	Day	3 1 4 27% 42% 23%	726
	11th to 20th	Day	5% 1 3 15% 45% 32%	524
	21st to end	Day	12% 2 7% 21% 32% 26%	583
September	1st to 10th	Day	10% 4 6% 24% 37% 19%	477
	11th to 20th	Day	11% 3 8% 31% 31% 16%	330
	21st to end	Day	13% 3 14% 29% 32% 9%	330
October	1st to 10th	Day	6% 3 21% 41% 22% 7%	330
	11th to 20th	Day	9% 7% 18% 38% 18% 9%	330
	21st to end	Day	17% 9% 23% 31% 14% 6%	363
November	1st to 10th	Day	14% 9% 26% 28% 19% 2	330
	11th to 20th	Day	16% 10% 31% 32% 9% 2	330
	21st to end	Day	20% 20% 30% 21% 8% 2	330
December	1st to 10th	Day	25% 9% 34% 19% 9% 3	330
	11th to 20th	Day	16% 13% 42% 23% 6% 1	321
	21st to end	Day	25% 17% 32% 18% 6% 2	330
January	1st to 10th	Night	24% 10% 32% 27% 7%	1000
	11th to 20th	Night	23% 10% 31% 28% 7%	1000
	21st to end	Night	24% 11% 29% 30% 5%	1100
February	1st to 10th	Night	24% 12% 31% 29% 4	1000
	11th to 20th	Night	30% 9% 30% 25% 6%	718
	21st to end	Night	25% 13% 35% 25% 3	495
March	1st to 10th	Night	27% 9% 30% 30% 4	600
	11th to 20th	Night	21% 11% 34% 28% 6%	600
	21st to end	Night	22% 8% 32% 30% 8%	660
April	1st to 10th	Night	19% 11% 36% 28% 7%	600
	11th to 20th	Night	19% 11% 28% 30% 11%	593
	21st to end	Night	18% 8% 33% 31% 10% 1	600
May	1st to 10th	Night	16% 10% 29% 35% 10%	600
	11th to 20th	Night	13% 7% 25% 38% 17% 1	591
	21st to end	Night	8% 6% 21% 38% 24% 3	650
June	1st to 10th	Night	6% 2 9% 40% 39% 5%	600
	11th to 20th	Night	5% 1 12% 42% 35% 4	600
	21st to end	Night	8% 2 8% 30% 43% 9%	600
July	1st to 10th	Night	6% 1 6% 32% 44% 11%	585
	11th to 20th	Night	3 5% 31% 48% 12%	582
	21st to end	Night	5% 1 4 30% 48% 12%	657
August	1st to 10th	Night	2 1 3 27% 57% 10%	597
	11th to 20th	Night	5% 1 2 24% 54% 15%	594
	21st to end	Night	8% 2 5% 23% 49% 14%	660
September	1st to 10th	Night	8% 2 7% 26% 48% 9%	600
	11th to 20th	Night	11% 2 6% 26% 48% 8%	600
	21st to end	Night	10% 1 8% 33% 39% 9%	600
October	1st to 10th	Night	7% 3 12% 34% 39% 5%	785
	11th to 20th	Night	11% 3 20% 38% 25% 3	800
	21st to end	Night	13% 7% 21% 35% 21% 3	880
November	1st to 10th	Night	14% 4 20% 37% 24% 2	820
	11th to 20th	Night	13% 7% 25% 38% 16%	840
	21st to end	Night	18% 7% 32% 29% 13% 1	840
December	1st to 10th	Night	25% 8% 26% 30% 11%	998
	11th to 20th	Night	23% 10% 28% 31% 8%	1036
	21st to end	Night	23% 9% 29% 30% 7%	1100

Page generated at 2025-12-15 00:13:55. Version ac07

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