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 2024-01-13.

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% 3 6% 6% 4 5% 5% 6% 8% 39%	74999
	Night	14% 6% 2 4 4 3 4 4 5% 8% 47%	74770
Transparency	Day	43% 5% 11% 18% 16% 6%	74724
	Night	37% 5% 13% 20% 17% 8%	74565
Seeing	Day	14% 8% 20% 26% 22% 11%	13767
	Night	16% 6% 22% 31% 22% 4	23705

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	20% 6% 2 5% 5% 2 3 4 5% 5% 43%	1707
	11th to 20th	Day	18% 6% 3 5% 4 3 4 3 3 5% 46%	1643
	21st to end	Day	20% 7% 3 5% 5% 3 3 3 4 5% 42%	1782
February	1st to 10th	Day	24% 7% 4 5% 6% 3 4 4 4 5% 35%	1620
	11th to 20th	Day	25% 8% 3 6% 4 2 3 4 4 4 37%	1819
	21st to end	Day	25% 7% 3 5% 5% 2 4 3 4 5% 36%	1628
March	1st to 10th	Day	23% 8% 3 6% 5% 3 4 4 4 6% 35%	1980
	11th to 20th	Day	20% 8% 3 6% 5% 3 4 3 4 7% 37%	1980
	21st to end	Day	16% 6% 3 5% 5% 3 5% 4 5% 5% 42%	2178
April	1st to 10th	Day	16% 6% 4 6% 5% 3 6% 5% 5% 6% 38%	2022
	11th to 20th	Day	19% 6% 3 5% 5% 3 4 5% 5% 7% 37%	2134
	21st to end	Day	12% 6% 3 6% 6% 3 4 5% 5% 7% 43%	2160
May	1st to 10th	Day	13% 6% 3 6% 6% 3 6% 6% 5% 9% 37%	2160
	11th to 20th	Day	11% 5% 2 6% 5% 3 6% 6% 6% 9% 41%	2219
	21st to end	Day	10% 6% 4 7% 8% 5% 7% 6% 8% 9% 31%	2531
June	1st to 10th	Day	8% 5% 3 6% 8% 5% 7% 8% 8% 9% 34%	2340
	11th to 20th	Day	6% 5% 3 5% 7% 5% 9% 7% 8% 10% 35%	2340
	21st to end	Day	8% 6% 3 8% 7% 5% 10% 8% 8% 10% 26%	2340
July	1st to 10th	Day	10% 5% 3 6% 8% 5% 8% 8% 9% 11% 27%	2340
	11th to 20th	Day	9% 4 2 6% 8% 5% 7% 8% 9% 11% 32%	2340
	21st to end	Day	8% 4 2 6% 8% 5% 9% 9% 8% 11% 31%	2546
August	1st to 10th	Day	3 3 2 6% 6% 5% 7% 8% 9% 13% 37%	2328
	11th to 20th	Day	6% 4 2 6% 7% 4 9% 7% 9% 10% 36%	2130
	21st to end	Day	11% 5% 2 6% 7% 5% 7% 8% 7% 9% 33%	2376
September	1st to 10th	Day	9% 5% 2 7% 6% 5% 6% 7% 6% 9% 37%	2113
	11th to 20th	Day	16% 6% 2 6% 6% 4 6% 6% 7% 9% 33%	1980
	21st to end	Day	11% 5% 2 5% 6% 3 5% 5% 6% 7% 44%	1976
October	1st to 10th	Day	7% 4 2 4 5% 3 5% 4 5% 7% 53%	1800
	11th to 20th	Day	10% 5% 2 4 5% 3 4 5% 5% 7% 50%	1800
	21st to end	Day	14% 5% 2 4 4 2 3 3 4 6% 52%	1980
November	1st to 10th	Day	12% 5% 2 5% 5% 4 5% 5% 5% 6% 47%	1858
	11th to 20th	Day	14% 6% 2 6% 5% 2 4 4 4 6% 48%	1900
	21st to end	Day	17% 8% 2 5% 5% 3 4 3 3 5% 43%	1900
December	1st to 10th	Day	17% 8% 3 5% 5% 3 4 5% 4 6% 41%	1753
	11th to 20th	Day	17% 7% 4 7% 5% 2 4 4 4 6% 39%	2161
	21st to end	Day	18% 7% 2 5% 4 2 3 4 5% 6% 43%	3135
January	1st to 10th	Night	19% 8% 3 4 3 2 3 3 4 7% 43%	2458
	11th to 20th	Night	21% 6% 3 4 3 2 3 2 3 5% 47%	2379
	21st to end	Night	20% 7% 3 5% 5% 3 3 3 4 5% 42%	2574
February	1st to 10th	Night	19% 8% 4 5% 4 2 3 4 4 6% 40%	2340
	11th to 20th	Night	23% 8% 3 4 3 2 3 2 3 5% 43%	2042
	21st to end	Night	26% 7% 3 6% 4 2 4 3 5% 5% 35%	1628
March	1st to 10th	Night	21% 9% 2 4 4 2 3 4 4 6% 40%	1980
	11th to 20th	Night	18% 7% 3 5% 6% 3 4 3 5% 6% 41%	1980
	21st to end	Night	17% 7% 2 4 4 2 3 4 4 7% 46%	2178
April	1st to 10th	Night	16% 7% 2 6% 5% 3 4 4 5% 8% 40%	1936
	11th to 20th	Night	18% 4 2 5% 4 2 4 4 5% 9% 44%	1775
	21st to end	Night	14% 7% 3 5% 4 3 4 4 5% 6% 45%	1800
May	1st to 10th	Night	14% 6% 3 5% 4 3 4 5% 7% 9% 41%	1800
	11th to 20th	Night	11% 5% 2 5% 4 3 4 4 6% 7% 50%	1671
	21st to end	Night	8% 4 1 3 5% 3 5% 5% 7% 11% 48%	1745
June	1st to 10th	Night	6% 3 1 4 4 2 4 5% 6% 10% 54%	1620
	11th to 20th	Night	4 3 2 3 3 2 4 5% 7% 13% 53%	1620
	21st to end	Night	7% 5% 3 4 5% 3 5% 6% 8% 11% 42%	1620
July	1st to 10th	Night	7% 4 2 4 5% 4 4 5% 7% 13% 44%	1620
	11th to 20th	Night	4 3 2 4 5% 3 3 5% 6% 12% 55%	1620
	21st to end	Night	5% 3 2 3 4 4 5% 6% 7% 13% 49%	1772
August	1st to 10th	Night	3 1 1 2 3 2 3 5% 7% 14% 60%	1611
	11th to 20th	Night	4 3 1 3 4 3 5% 6% 8% 14% 48%	1768
	21st to end	Night	8% 3 2 4 5% 3 6% 5% 6% 12% 45%	1980
September	1st to 10th	Night	6% 4 2 5% 5% 3 5% 5% 7% 11% 48%	1841
	11th to 20th	Night	11% 5% 3 5% 5% 4 5% 5% 6% 8% 43%	1980
	21st to end	Night	9% 4 2 4 4 3 4 4 4 6% 57%	1980
October	1st to 10th	Night	6% 3 1 3 4 2 4 4 5% 6% 60%	2146
	11th to 20th	Night	11% 3 2 3 3 2 3 4 4 7% 57%	2160
	21st to end	Night	12% 5% 2 3 3 2 3 3 3 5% 59%	2376
November	1st to 10th	Night	10% 5% 2 4 4 3 3 4 4 7% 55%	2220
	11th to 20th	Night	12% 5% 2 4 3 2 4 4 5% 6% 53%	2280
	21st to end	Night	16% 7% 3 6% 5% 3 3 4 5% 5% 45%	2280
December	1st to 10th	Night	19% 8% 2 4 4 2 4 4 4 6% 43%	2422
	11th to 20th	Night	18% 8% 3 5% 5% 2 3 3 5% 5% 43%	3036
	21st to end	Night	19% 7% 2 4 5% 3 4 4 5% 5% 42%	4532

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	43% 4 5% 19% 20% 9%	1708
	11th to 20th	Day	42% 3 6% 17% 22% 10%	1643
	21st to end	Day	46% 3 5% 16% 18% 12%	1782
February	1st to 10th	Day	52% 3 6% 14% 16% 10%	1620
	11th to 20th	Day	51% 3 5% 14% 17% 9%	1829
	21st to end	Day	52% 3 6% 14% 16% 9%	1628
March	1st to 10th	Day	51% 3 8% 13% 18% 7%	1980
	11th to 20th	Day	49% 3 8% 12% 20% 9%	1980
	21st to end	Day	43% 4 8% 16% 22% 6%	2178
April	1st to 10th	Day	46% 4 9% 16% 16% 8%	2022
	11th to 20th	Day	47% 4 8% 16% 15% 10%	2134
	21st to end	Day	41% 4 9% 17% 23% 6%	2160
May	1st to 10th	Day	43% 4 12% 16% 17% 7%	2160
	11th to 20th	Day	38% 6% 11% 25% 17% 3	2223
	21st to end	Day	46% 7% 13% 20% 12% 2	2531
June	1st to 10th	Day	44% 6% 15% 20% 14% 1	2340
	11th to 20th	Day	40% 8% 13% 24% 14% 2	2340
	21st to end	Day	48% 9% 17% 18% 8%	2340
July	1st to 10th	Day	47% 9% 19% 20% 5%	2276
	11th to 20th	Day	43% 10% 22% 19% 6%	2271
	21st to end	Day	41% 10% 22% 22% 4 1	2405
August	1st to 10th	Day	35% 9% 19% 27% 9%	2314
	11th to 20th	Day	40% 9% 20% 23% 6% 1	2130
	21st to end	Day	44% 10% 18% 19% 8% 2	2376
September	1st to 10th	Day	42% 9% 14% 17% 13% 4	2113
	11th to 20th	Day	46% 7% 13% 16% 14% 4	1980
	21st to end	Day	38% 5% 11% 21% 16% 9%	1976
October	1st to 10th	Day	31% 5% 10% 20% 22% 12%	1800
	11th to 20th	Day	34% 4 6% 18% 24% 14%	1800
	21st to end	Day	35% 2 5% 15% 26% 16%	1980
November	1st to 10th	Day	37% 4 8% 20% 21% 11%	1858
	11th to 20th	Day	39% 3 7% 17% 22% 12%	1900
	21st to end	Day	45% 3 5% 19% 20% 9%	1900
December	1st to 10th	Day	45% 3 9% 19% 17% 7%	1753
	11th to 20th	Day	47% 3 6% 15% 20% 10%	2159
	21st to end	Day	43% 2 6% 16% 24% 9%	3135
January	1st to 10th	Night	43% 2 5% 17% 23% 10%	2458
	11th to 20th	Night	43% 2 5% 18% 21% 11%	2379
	21st to end	Night	47% 3 5% 15% 18% 13%	2574
February	1st to 10th	Night	47% 3 7% 12% 19% 12%	2340
	11th to 20th	Night	46% 3 6% 16% 19% 10%	2042
	21st to end	Night	51% 3 7% 13% 13% 12%	1628
March	1st to 10th	Night	47% 4 8% 14% 17% 11%	1980
	11th to 20th	Night	46% 4 11% 12% 20% 8%	1980
	21st to end	Night	40% 4 12% 16% 21% 7%	2178
April	1st to 10th	Night	44% 4 9% 19% 15% 9%	1936
	11th to 20th	Night	38% 4 10% 19% 16% 12%	1775
	21st to end	Night	40% 4 8% 21% 21% 7%	1800
May	1st to 10th	Night	41% 5% 13% 17% 17% 8%	1800
	11th to 20th	Night	35% 4 11% 25% 20% 4	1672
	21st to end	Night	29% 7% 18% 30% 13% 2	1746
June	1st to 10th	Night	25% 6% 20% 32% 16% 1	1620
	11th to 20th	Night	23% 7% 19% 33% 16% 2	1620
	21st to end	Night	34% 9% 22% 26% 9%	1620
July	1st to 10th	Night	33% 7% 28% 27% 5%	1575
	11th to 20th	Night	23% 7% 37% 27% 7%	1566
	21st to end	Night	24% 10% 33% 26% 6%	1673
August	1st to 10th	Night	15% 7% 32% 36% 9%	1601
	11th to 20th	Night	26% 10% 29% 28% 7% 1	1768
	21st to end	Night	32% 9% 25% 22% 9% 2	1980
September	1st to 10th	Night	28% 9% 22% 24% 13% 4	1841
	11th to 20th	Night	38% 7% 18% 18% 15% 5%	1980
	21st to end	Night	30% 5% 12% 24% 18% 11%	1980
October	1st to 10th	Night	26% 4 10% 25% 21% 14%	2146
	11th to 20th	Night	28% 5% 6% 22% 23% 15%	2160
	21st to end	Night	29% 2 8% 16% 26% 19%	2376
November	1st to 10th	Night	31% 3 11% 20% 24% 11%	2220
	11th to 20th	Night	33% 3 9% 19% 24% 11%	2280
	21st to end	Night	41% 3 8% 18% 19% 11%	2280
December	1st to 10th	Night	44% 3 9% 20% 15% 10%	2422
	11th to 20th	Night	45% 3 5% 13% 20% 14%	3037
	21st to end	Night	45% 3 7% 13% 25% 7%	4532

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	26% 14% 38% 13% 8% 1	270
	11th to 20th	Day	18% 17% 35% 23% 6% 1	248
	21st to end	Day	22% 22% 33% 19% 4	264
February	1st to 10th	Day	30% 15% 31% 18% 5%	240
	11th to 20th	Day	36% 16% 28% 18% 3	240
	21st to end	Day	31% 26% 29% 12% 2	198
March	1st to 10th	Day	25% 21% 34% 15% 5%	240
	11th to 20th	Day	18% 26% 37% 14% 4	240
	21st to end	Day	24% 17% 36% 18% 5%	264
April	1st to 10th	Day	17% 19% 34% 25% 5%	282
	11th to 20th	Day	26% 16% 24% 21% 13% 1	412
	21st to end	Day	16% 12% 33% 26% 12% 1	420
May	1st to 10th	Day	18% 10% 29% 26% 15% 1	423
	11th to 20th	Day	12% 7% 25% 34% 18% 4	542
	21st to end	Day	10% 4 25% 35% 20% 6%	679
June	1st to 10th	Day	7% 3 15% 34% 28% 13%	630
	11th to 20th	Day	7% 3 14% 35% 29% 11%	630
	21st to end	Day	11% 3 12% 26% 30% 18%	630
July	1st to 10th	Day	7% 2 8% 27% 36% 20%	621
	11th to 20th	Day	6% 1 5% 26% 38% 24%	618
	21st to end	Day	7% 2 5% 25% 36% 24%	684
August	1st to 10th	Day	4 4 26% 42% 24%	626
	11th to 20th	Day	6% 3 14% 47% 30%	444
	21st to end	Day	12% 2 7% 18% 32% 29%	495
September	1st to 10th	Day	8% 2 5% 21% 41% 22%	403
	11th to 20th	Day	12% 2 9% 29% 32% 15%	270
	21st to end	Day	15% 2 10% 30% 34% 9%	270
October	1st to 10th	Day	8% 3 19% 39% 23% 8%	270
	11th to 20th	Day	11% 7% 17% 36% 19% 10%	270
	21st to end	Day	20% 9% 24% 30% 12% 4	297
November	1st to 10th	Day	14% 6% 24% 33% 21% 2	270
	11th to 20th	Day	18% 10% 31% 31% 8% 2	270
	21st to end	Day	21% 20% 28% 20% 9% 2	270
December	1st to 10th	Day	22% 8% 33% 23% 11% 4	270
	11th to 20th	Day	18% 13% 42% 21% 4 1	270
	21st to end	Day	24% 18% 33% 18% 5% 2	297
January	1st to 10th	Night	23% 10% 31% 28% 8%	950
	11th to 20th	Night	23% 8% 31% 29% 8%	915
	21st to end	Night	22% 11% 30% 31% 6%	990
February	1st to 10th	Night	23% 12% 31% 29% 4	900
	11th to 20th	Night	30% 9% 30% 25% 6%	646
	21st to end	Night	26% 12% 35% 25% 3	444
March	1st to 10th	Night	26% 8% 30% 32% 4	540
	11th to 20th	Night	21% 10% 33% 30% 6%	540
	21st to end	Night	21% 7% 31% 31% 9%	594
April	1st to 10th	Night	17% 9% 38% 28% 7%	540
	11th to 20th	Night	19% 10% 28% 31% 12%	533
	21st to end	Night	17% 7% 34% 31% 11% 1	540
May	1st to 10th	Night	14% 10% 30% 35% 11%	540
	11th to 20th	Night	12% 5% 25% 38% 18% 1	531
	21st to end	Night	8% 4 19% 40% 26% 3	584
June	1st to 10th	Night	6% 1 9% 40% 40% 5%	540
	11th to 20th	Night	4 1 11% 43% 36% 5%	540
	21st to end	Night	9% 2 8% 30% 42% 9%	540
July	1st to 10th	Night	6% 1 5% 33% 43% 11%	525
	11th to 20th	Night	3 6% 31% 47% 13%	522
	21st to end	Night	5% 1 3 30% 49% 13%	591
August	1st to 10th	Night	3 3 27% 57% 10%	537
	11th to 20th	Night	5% 1 2 24% 52% 16%	534
	21st to end	Night	8% 1 5% 22% 50% 14%	594
September	1st to 10th	Night	6% 2 5% 24% 52% 10%	540
	11th to 20th	Night	11% 1 7% 25% 48% 8%	540
	21st to end	Night	11% 1 7% 31% 40% 9%	540
October	1st to 10th	Night	7% 2 11% 33% 40% 6%	706
	11th to 20th	Night	12% 3 19% 37% 25% 3	720
	21st to end	Night	13% 7% 21% 34% 21% 3	792
November	1st to 10th	Night	12% 4 20% 38% 24% 2	740
	11th to 20th	Night	14% 8% 24% 38% 16%	760
	21st to end	Night	19% 6% 31% 29% 13% 1	760
December	1st to 10th	Night	23% 7% 26% 31% 12%	902
	11th to 20th	Night	24% 9% 28% 31% 7%	950
	21st to end	Night	24% 10% 29% 30% 7%	1045

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