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 2024-11-30.

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 4 5% 7% 44%	101055
	Night	13% 6% 2 5% 4 4 4 3 5% 7% 49%	98600
Transparency	Day	37% 5% 10% 24% 19% 4	104696
	Night	34% 5% 9% 24% 22% 7%	103100
Seeing	Day	15% 9% 23% 26% 19% 8%	15433
	Night	15% 8% 26% 31% 18% 3	25218

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	18% 11% 4 8% 3 3 2 2 3 4 45%	2760
	11th to 20th	Day	18% 9% 2 5% 3 3 3 2 3 4 48%	2850
	21st to end	Day	24% 8% 2 5% 3 2 3 2 3 4 43%	3135
February	1st to 10th	Day	21% 7% 3 6% 4 3 3 2 4 6% 41%	1776
	11th to 20th	Day	19% 9% 3 7% 4 4 3 2 3 5% 41%	1848
	21st to end	Day	23% 8% 3 7% 3 3 4 3 4 5% 36%	1570
March	1st to 10th	Day	19% 12% 4 8% 4 3 3 3 4 5% 35%	3270
	11th to 20th	Day	14% 8% 2 6% 4 4 3 3 3 5% 46%	3480
	21st to end	Day	14% 8% 3 9% 4 4 3 3 4 5% 43%	3973
April	1st to 10th	Day	12% 7% 2 6% 4 4 4 4 5% 6% 45%	2280
	11th to 20th	Day	14% 7% 2 6% 4 3 4 3 5% 7% 45%	2254
	21st to end	Day	14% 7% 2 7% 5% 4 4 3 6% 6% 42%	2280
May	1st to 10th	Day	12% 7% 3 7% 4 5% 6% 4 6% 8% 38%	3765
	11th to 20th	Day	11% 6% 2 7% 4 4 5% 4 8% 9% 39%	3872
	21st to end	Day	11% 7% 2 8% 6% 6% 6% 4 7% 8% 35%	4824
June	1st to 10th	Day	7% 5% 2 5% 5% 6% 7% 5% 8% 10% 42%	2660
	11th to 20th	Day	5% 4 2 5% 4 5% 5% 5% 8% 11% 48%	2660
	21st to end	Day	4 4 2 5% 5% 5% 5% 5% 7% 10% 48%	2660
July	1st to 10th	Day	6% 5% 2 6% 5% 5% 6% 5% 8% 10% 41%	4416
	11th to 20th	Day	7% 4 2 5% 4 4 5% 4 8% 11% 45%	4120
	21st to end	Day	14% 8% 3 8% 5% 5% 5% 4 7% 8% 33%	4465
August	1st to 10th	Day	3 2 1 4 3 3 5% 4 6% 9% 60%	3921
	11th to 20th	Day	7% 4 1 7% 4 4 6% 4 7% 10% 46%	3729
	21st to end	Day	5% 4 2 5% 4 4 5% 4 6% 9% 52%	4180
September	1st to 10th	Day	9% 5% 2 6% 5% 4 5% 4 6% 8% 44%	2280
	11th to 20th	Day	13% 5% 2 6% 4 4 4 4 5% 8% 46%	2263
	21st to end	Day	9% 5% 2 5% 4 4 5% 4 4 6% 53%	2085
October	1st to 10th	Day	7% 3 1 5% 4 4 4 2 4 6% 59%	1900
	11th to 20th	Day	12% 4 1 4 3 3 3 3 4 6% 56%	1900
	21st to end	Day	18% 6% 1 4 2 3 3 2 4 5% 51%	2090
November	1st to 10th	Day	12% 7% 2 4 4 2 2 3 4 4 56%	1878
	11th to 20th	Day	12% 5% 2 3 3 4 3 3 6% 6% 54%	1800
	21st to end	Day	18% 7% 2 5% 3 3 3 3 5% 6% 45%	1797
December	1st to 10th	Day	19% 8% 2 6% 4 3 4 2 4 4 43%	1613
	11th to 20th	Day	15% 7% 3 6% 4 4 3 3 4 5% 44%	1918
	21st to end	Day	14% 9% 4 8% 4 4 4 4 6% 5% 37%	2783
January	1st to 10th	Night	18% 7% 2 6% 4 4 3 3 4 5% 45%	4191
	11th to 20th	Night	19% 6% 2 4 3 3 3 2 3 4 49%	4120
	21st to end	Night	23% 7% 2 4 3 2 3 2 3 5% 46%	4532
February	1st to 10th	Night	21% 7% 3 6% 3 4 3 3 5% 5% 40%	2402
	11th to 20th	Night	19% 8% 3 6% 4 3 3 2 3 5% 45%	2218
	21st to end	Night	20% 7% 2 5% 4 4 3 2 3 6% 43%	1884
March	1st to 10th	Night	19% 9% 2 6% 4 4 3 2 4 5% 41%	3612
	11th to 20th	Night	13% 6% 2 5% 4 4 4 3 4 6% 50%	3480
	21st to end	Night	12% 7% 3 7% 4 4 4 4 5% 7% 44%	3658
April	1st to 10th	Night	11% 6% 2 5% 4 3 4 4 5% 8% 48%	1900
	11th to 20th	Night	14% 5% 2 4 4 3 3 3 5% 7% 51%	1875
	21st to end	Night	13% 5% 2 6% 3 4 4 3 4 6% 49%	1900
May	1st to 10th	Night	19% 7% 2 6% 3 3 4 3 5% 8% 40%	3130
	11th to 20th	Night	14% 6% 2 5% 4 4 3 3 5% 6% 46%	3013
	21st to end	Night	9% 6% 2 7% 5% 5% 6% 4 7% 10% 40%	2743
June	1st to 10th	Night	7% 5% 2 4 4 4 5% 5% 7% 10% 47%	1520
	11th to 20th	Night	1 3 1 3 4 4 4 3 7% 9% 60%	1520
	21st to end	Night	3 3 1 4 4 4 5% 4 5% 10% 58%	1520
July	1st to 10th	Night	5% 4 1 4 4 4 4 5% 8% 13% 47%	2549
	11th to 20th	Night	5% 3 2 4 4 3 4 4 7% 11% 53%	2850
	21st to end	Night	12% 8% 3 8% 5% 4 4 4 5% 7% 41%	3098
August	1st to 10th	Night	2 2 1 3 3 2 3 2 5% 9% 69%	3011
	11th to 20th	Night	4 2 1 4 4 4 4 4 7% 10% 55%	3100
	21st to end	Night	4 3 1 4 4 4 4 4 6% 9% 58%	3476
September	1st to 10th	Night	8% 4 2 5% 4 3 4 3 5% 8% 55%	1900
	11th to 20th	Night	11% 6% 1 4 4 3 4 3 5% 8% 51%	1900
	21st to end	Night	7% 5% 2 5% 3 4 3 3 5% 6% 57%	2086
October	1st to 10th	Night	7% 3 1 4 2 2 3 3 4 8% 63%	2280
	11th to 20th	Night	10% 4 2 4 3 2 4 2 3 5% 61%	2280
	21st to end	Night	17% 5% 2 4 3 3 3 2 3 4 55%	2508
November	1st to 10th	Night	12% 5% 2 4 3 3 4 3 4 5% 55%	2417
	11th to 20th	Night	11% 5% 2 4 3 3 3 3 5% 6% 55%	2600
	21st to end	Night	14% 6% 2 4 3 3 3 3 4 6% 51%	2599
December	1st to 10th	Night	18% 7% 2 6% 3 3 3 2 4 5% 46%	2565
	11th to 20th	Night	16% 7% 2 5% 3 3 3 2 4 5% 49%	3279
	21st to end	Night	15% 7% 3 8% 5% 5% 5% 3 6% 6% 38%	4884

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 5% 25% 19% 3	2761
	11th to 20th	Day	41% 4 8% 25% 20% 2	2850
	21st to end	Day	47% 2 7% 19% 21% 4	3135
February	1st to 10th	Day	47% 3 10% 22% 16% 2	1776
	11th to 20th	Day	48% 3 7% 19% 18% 5%	1858
	21st to end	Day	52% 3 7% 15% 15% 7%	1570
March	1st to 10th	Day	52% 4 8% 13% 15% 9%	3270
	11th to 20th	Day	41% 4 8% 25% 18% 4	3480
	21st to end	Day	45% 3 8% 23% 20% 1	3973
April	1st to 10th	Day	38% 6% 8% 24% 20% 3	2280
	11th to 20th	Day	38% 5% 8% 24% 18% 6%	2254
	21st to end	Day	41% 6% 9% 24% 19% 1	2280
May	1st to 10th	Day	42% 8% 11% 23% 15% 2	3800
	11th to 20th	Day	38% 8% 17% 23% 13% 1	3876
	21st to end	Day	42% 8% 11% 26% 11% 1	4837
June	1st to 10th	Day	33% 8% 14% 25% 18% 2	2660
	11th to 20th	Day	28% 7% 13% 30% 17% 4	2660
	21st to end	Day	28% 8% 14% 25% 20% 4	2660
July	1st to 10th	Day	35% 8% 15% 26% 14% 2	4347
	11th to 20th	Day	29% 6% 13% 37% 12% 2	4051
	21st to end	Day	48% 6% 13% 25% 8% 1	4325
August	1st to 10th	Day	20% 6% 17% 32% 22% 3	3907
	11th to 20th	Day	33% 6% 16% 28% 14% 2	3765
	21st to end	Day	28% 6% 13% 30% 21% 3	4179
September	1st to 10th	Day	35% 7% 11% 24% 17% 6%	2280
	11th to 20th	Day	37% 6% 9% 20% 23% 5%	2263
	21st to end	Day	32% 5% 9% 21% 25% 8%	2085
October	1st to 10th	Day	16% 3 6% 15% 36% 25%	3160
	11th to 20th	Day	18% 3 3 22% 39% 15%	3140
	21st to end	Day	28% 2 3 30% 29% 8%	3428
November	1st to 10th	Day	33% 3 7% 25% 24% 9%	1878
	11th to 20th	Day	32% 4 7% 23% 26% 8%	1800
	21st to end	Day	41% 3 7% 21% 22% 5%	1797
December	1st to 10th	Day	45% 3 8% 23% 16% 5%	1613
	11th to 20th	Day	43% 4 6% 21% 21% 4	1915
	21st to end	Day	47% 6% 8% 23% 13% 4	2783
January	1st to 10th	Night	43% 4 5% 22% 24% 3	4191
	11th to 20th	Night	41% 3 7% 22% 23% 4	4120
	21st to end	Night	43% 3 8% 22% 20% 4	4532
February	1st to 10th	Night	46% 4 8% 19% 19% 4	2402
	11th to 20th	Night	44% 3 7% 22% 18% 6%	2219
	21st to end	Night	44% 4 6% 17% 21% 8%	1884
March	1st to 10th	Night	46% 4 7% 15% 17% 11%	3612
	11th to 20th	Night	36% 5% 9% 24% 20% 7%	3480
	21st to end	Night	39% 5% 9% 24% 21% 2	3658
April	1st to 10th	Night	33% 5% 11% 24% 21% 6%	1900
	11th to 20th	Night	34% 3 8% 24% 23% 8%	1875
	21st to end	Night	36% 5% 9% 24% 23% 3	1900
May	1st to 10th	Night	42% 6% 12% 23% 14% 3	3160
	11th to 20th	Night	38% 6% 16% 24% 15% 1	3014
	21st to end	Night	37% 8% 13% 26% 14% 2	2751
June	1st to 10th	Night	29% 8% 14% 24% 22% 3	1520
	11th to 20th	Night	19% 5% 14% 30% 26% 6%	1520
	21st to end	Night	21% 7% 15% 30% 21% 6%	1520
July	1st to 10th	Night	26% 7% 21% 26% 18% 2	2509
	11th to 20th	Night	23% 6% 14% 35% 18% 4	2796
	21st to end	Night	43% 5% 13% 25% 13% 1	2999
August	1st to 10th	Night	14% 4 13% 41% 26% 2	3001
	11th to 20th	Night	23% 7% 20% 31% 18% 2	3130
	21st to end	Night	23% 5% 11% 28% 29% 4	3476
September	1st to 10th	Night	28% 6% 9% 26% 21% 9%	1900
	11th to 20th	Night	31% 6% 9% 21% 26% 6%	1900
	21st to end	Night	28% 5% 8% 23% 27% 9%	2086
October	1st to 10th	Night	13% 3 5% 20% 31% 28%	3800
	11th to 20th	Night	17% 3 3 16% 34% 27%	3779
	21st to end	Night	26% 3 4 25% 28% 14%	4120
November	1st to 10th	Night	32% 3 6% 24% 26% 9%	2417
	11th to 20th	Night	30% 3 6% 23% 27% 11%	2600
	21st to end	Night	36% 4 7% 21% 27% 5%	2599
December	1st to 10th	Night	42% 3 9% 22% 20% 5%	2565
	11th to 20th	Night	39% 3 6% 22% 26% 4	3281
	21st to end	Night	44% 6% 9% 20% 17% 4	4884

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	29% 16% 37% 13% 3 2	270
	11th to 20th	Day	29% 21% 35% 13% 2	270
	21st to end	Day	20% 22% 42% 13% 4	297
February	1st to 10th	Day	26% 20% 35% 16% 4 1	270
	11th to 20th	Day	32% 24% 32% 9% 3	270
	21st to end	Day	37% 24% 28% 10% 2	225
March	1st to 10th	Day	27% 20% 31% 16% 4 1	270
	11th to 20th	Day	27% 21% 34% 16% 1	270
	21st to end	Day	24% 19% 34% 17% 6% 1	392
April	1st to 10th	Day	18% 18% 33% 22% 8% 1	460
	11th to 20th	Day	22% 15% 33% 20% 9% 2	452
	21st to end	Day	18% 15% 33% 22% 11% 2	460
May	1st to 10th	Day	16% 14% 31% 28% 10% 1	463
	11th to 20th	Day	13% 6% 29% 29% 16% 7%	492
	21st to end	Day	8% 6% 23% 30% 23% 9%	734
June	1st to 10th	Day	9% 3 20% 28% 24% 15%	680
	11th to 20th	Day	5% 2 14% 40% 27% 12%	680
	21st to end	Day	6% 3 18% 35% 26% 12%	680
July	1st to 10th	Day	5% 2 13% 29% 32% 19%	671
	11th to 20th	Day	6% 1 12% 31% 32% 17%	668
	21st to end	Day	7% 3 9% 32% 34% 15%	739
August	1st to 10th	Day	7% 2 10% 33% 35% 13%	571
	11th to 20th	Day	13% 3 9% 34% 28% 13%	479
	21st to end	Day	10% 1 7% 24% 32% 25%	539
September	1st to 10th	Day	9% 2 9% 29% 36% 14%	490
	11th to 20th	Day	11% 3 13% 22% 31% 19%	490
	21st to end	Day	13% 5% 15% 33% 24% 10%	485
October	1st to 10th	Day	9% 5% 22% 33% 25% 6%	300
	11th to 20th	Day	12% 10% 34% 25% 13% 5%	300
	21st to end	Day	24% 11% 31% 22% 10% 2	330
November	1st to 10th	Day	19% 12% 27% 27% 13% 2	300
	11th to 20th	Day	10% 18% 37% 25% 9% 1	300
	21st to end	Day	23% 17% 31% 18% 8% 2	299
December	1st to 10th	Day	23% 20% 30% 20% 5% 2	270
	11th to 20th	Day	27% 19% 26% 18% 9% 1	270
	21st to end	Day	23% 21% 35% 17% 2 1	297
January	1st to 10th	Night	23% 10% 39% 22% 6%	950
	11th to 20th	Night	24% 14% 36% 23% 3	950
	21st to end	Night	19% 14% 37% 27% 3	1045
February	1st to 10th	Night	25% 12% 33% 26% 4	882
	11th to 20th	Night	22% 15% 38% 23% 3	743
	21st to end	Night	26% 17% 32% 22% 3	628
March	1st to 10th	Night	21% 10% 35% 29% 6%	691
	11th to 20th	Night	18% 13% 38% 25% 5% 1	570
	21st to end	Night	18% 11% 34% 29% 7%	627
April	1st to 10th	Night	13% 13% 42% 24% 8%	570
	11th to 20th	Night	16% 10% 33% 29% 11% 1	563
	21st to end	Night	15% 8% 38% 30% 8% 2	570
May	1st to 10th	Night	17% 7% 25% 38% 12% 2	570
	11th to 20th	Night	14% 5% 28% 34% 17% 2	561
	21st to end	Night	7% 4 21% 38% 25% 5%	617
June	1st to 10th	Night	8% 2 15% 38% 31% 6%	570
	11th to 20th	Night	3 1 12% 47% 34% 3	570
	21st to end	Night	5% 2 12% 38% 38% 5%	570
July	1st to 10th	Night	2 2 9% 36% 41% 10%	555
	11th to 20th	Night	7% 1 8% 30% 44% 10%	552
	21st to end	Night	7% 1 7% 34% 42% 10%	624
August	1st to 10th	Night	5% 1 5% 33% 46% 9%	567
	11th to 20th	Night	6% 1 10% 37% 38% 7%	564
	21st to end	Night	7% 2 7% 26% 48% 9%	627
September	1st to 10th	Night	9% 2 9% 37% 38% 6%	570
	11th to 20th	Night	13% 2 12% 30% 37% 6%	570
	21st to end	Night	9% 3 16% 38% 30% 4	756
October	1st to 10th	Night	8% 4 17% 36% 29% 6%	760
	11th to 20th	Night	11% 6% 27% 35% 18% 2	760
	21st to end	Night	19% 8% 25% 32% 15% 1	836
November	1st to 10th	Night	13% 8% 27% 34% 16% 1	780
	11th to 20th	Night	13% 9% 35% 33% 11%	800
	21st to end	Night	16% 11% 33% 28% 11% 1	800
December	1st to 10th	Night	21% 10% 32% 32% 5%	855
	11th to 20th	Night	22% 11% 29% 32% 6%	950
	21st to end	Night	23% 12% 33% 27% 5%	1045

Page generated at 2024-11-27 16:30:54. Version ac07

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