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 2024-01-15.

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% 5% 3 5% 5% 3 5% 5% 6% 7% 44%	74713
	Night	12% 5% 2 4 4 3 4 4 5% 7% 49%	75069
Transparency	Day	38% 6% 11% 23% 18% 4	74432
	Night	35% 5% 10% 23% 22% 6%	74871
Seeing	Day	14% 9% 22% 26% 20% 9%	14207
	Night	15% 8% 26% 31% 18% 3	24109

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% 7% 3 5% 3 2 3 2 3 4 46%	1659
	11th to 20th	Day	20% 9% 3 6% 4 2 4 4 4 5% 39%	1656
	21st to end	Day	15% 6% 3 6% 4 1 4 3 4 5% 50%	1782
February	1st to 10th	Day	21% 7% 3 6% 5% 2 3 3 4 6% 41%	1683
	11th to 20th	Day	19% 8% 4 7% 4 3 4 3 3 5% 40%	1748
	21st to end	Day	24% 8% 4 6% 4 2 4 4 3 5% 36%	1480
March	1st to 10th	Day	19% 5% 3 5% 5% 2 4 5% 4 6% 42%	1880
	11th to 20th	Day	20% 8% 4 6% 6% 3 4 3 3 6% 36%	1980
	21st to end	Day	18% 7% 3 7% 5% 3 4 4 5% 7% 38%	2268
April	1st to 10th	Day	12% 6% 3 5% 5% 3 5% 4 5% 7% 45%	2160
	11th to 20th	Day	15% 7% 2 5% 4 2 4 4 5% 7% 46%	2134
	21st to end	Day	14% 6% 2 5% 6% 3 4 4 6% 7% 42%	2160
May	1st to 10th	Day	15% 6% 3 6% 5% 2 6% 5% 6% 8% 40%	2160
	11th to 20th	Day	11% 5% 3 5% 5% 3 5% 5% 7% 8% 43%	2176
	21st to end	Day	8% 5% 3 6% 7% 4 6% 6% 7% 10% 38%	2725
June	1st to 10th	Day	7% 4 2 4 5% 4 7% 6% 8% 10% 42%	2520
	11th to 20th	Day	4 3 2 5% 4 4 5% 6% 7% 11% 49%	2520
	21st to end	Day	4 3 2 4 5% 3 6% 6% 7% 10% 49%	2520
July	1st to 10th	Day	5% 4 3 6% 8% 4 7% 7% 9% 10% 37%	2510
	11th to 20th	Day	7% 4 2 5% 6% 4 7% 7% 8% 10% 41%	2340
	21st to end	Day	7% 3 2 5% 5% 4 5% 6% 7% 11% 44%	2546
August	1st to 10th	Day	5% 4 2 5% 6% 4 6% 7% 8% 10% 41%	2229
	11th to 20th	Day	10% 4 2 5% 5% 3 6% 5% 6% 11% 42%	2125
	21st to end	Day	8% 5% 2 5% 6% 4 5% 6% 7% 10% 43%	2376
September	1st to 10th	Day	9% 5% 2 5% 6% 3 5% 6% 6% 9% 44%	2160
	11th to 20th	Day	12% 5% 2 5% 5% 2 5% 4 5% 8% 47%	2144
	21st to end	Day	9% 4 2 5% 4 3 5% 4 4 6% 55%	1976
October	1st to 10th	Day	7% 3 2 4 4 3 4 3 5% 6% 58%	1800
	11th to 20th	Day	13% 4 1 4 4 2 4 4 4 6% 54%	1800
	21st to end	Day	19% 5% 1 3 3 2 4 3 4 5% 50%	1980
November	1st to 10th	Day	11% 6% 2 3 4 1 3 3 4 4 59%	1782
	11th to 20th	Day	12% 5% 3 3 4 3 3 4 5% 6% 54%	1710
	21st to end	Day	19% 7% 2 5% 3 2 2 4 5% 6% 44%	1710
December	1st to 10th	Day	19% 8% 2 6% 4 2 4 4 4 4 44%	1613
	11th to 20th	Day	16% 7% 3 6% 5% 3 4 3 4 5% 44%	1918
	21st to end	Day	14% 9% 4 7% 5% 3 4 5% 6% 5% 37%	2783
January	1st to 10th	Night	19% 7% 2 4 4 2 3 3 4 5% 47%	2502
	11th to 20th	Night	19% 7% 4 5% 4 3 4 4 3 5% 42%	2393
	21st to end	Night	16% 5% 2 4 4 2 4 3 4 5% 50%	2574
February	1st to 10th	Night	20% 7% 3 5% 4 3 4 4 4 6% 41%	2275
	11th to 20th	Night	19% 7% 3 5% 4 3 3 3 3 5% 45%	2098
	21st to end	Night	22% 7% 2 4 4 3 4 3 3 6% 42%	1776
March	1st to 10th	Night	18% 6% 2 5% 4 3 4 3 5% 5% 46%	2095
	11th to 20th	Night	16% 8% 3 6% 6% 3 5% 3 3 5% 42%	1980
	21st to end	Night	16% 7% 3 5% 4 2 5% 5% 4 6% 43%	2088
April	1st to 10th	Night	11% 6% 2 5% 4 3 4 5% 5% 8% 49%	1800
	11th to 20th	Night	13% 4 2 4 4 2 3 3 5% 7% 51%	1775
	21st to end	Night	13% 5% 2 5% 3 3 4 4 5% 7% 49%	1800
May	1st to 10th	Night	14% 5% 3 4 3 2 3 4 5% 8% 49%	1800
	11th to 20th	Night	12% 5% 2 5% 6% 3 4 4 5% 8% 47%	1708
	21st to end	Night	5% 4 3 5% 6% 3 5% 6% 7% 11% 44%	1551
June	1st to 10th	Night	6% 4 2 3 5% 3 5% 5% 8% 11% 48%	1440
	11th to 20th	Night	1 2 2 3 4 3 4 5% 6% 9% 61%	1440
	21st to end	Night	3 2 1 3 4 3 5% 4 5% 10% 59%	1440
July	1st to 10th	Night	2 3 2 3 5% 4 5% 6% 9% 14% 47%	1445
	11th to 20th	Night	5% 3 2 4 5% 2 6% 5% 7% 12% 49%	1620
	21st to end	Night	5% 3 1 4 4 3 4 6% 6% 10% 54%	1772
August	1st to 10th	Night	3 3 2 4 4 3 4 4 7% 12% 55%	1708
	11th to 20th	Night	6% 3 2 4 5% 3 5% 6% 8% 11% 48%	1776
	21st to end	Night	6% 4 2 5% 5% 4 5% 5% 6% 9% 51%	1980
September	1st to 10th	Night	8% 4 2 4 5% 2 4 4 5% 8% 56%	1800
	11th to 20th	Night	9% 5% 2 3 4 2 4 4 5% 8% 52%	1800
	21st to end	Night	7% 5% 2 4 3 3 3 3 5% 7% 58%	1976
October	1st to 10th	Night	7% 3 2 3 3 2 3 4 4 8% 62%	2160
	11th to 20th	Night	11% 4 2 4 4 2 4 3 3 5% 59%	2160
	21st to end	Night	18% 5% 2 4 3 3 3 3 3 4 53%	2376
November	1st to 10th	Night	11% 4 2 3 3 2 3 4 4 6% 58%	2293
	11th to 20th	Night	12% 4 2 4 4 2 3 4 5% 6% 55%	2470
	21st to end	Night	15% 5% 3 4 4 2 4 4 4 6% 49%	2470
December	1st to 10th	Night	18% 7% 2 5% 4 2 3 3 4 5% 46%	2565
	11th to 20th	Night	16% 6% 3 4 4 3 3 3 4 5% 49%	3279
	21st to end	Night	15% 7% 3 6% 6% 4 5% 4 5% 7% 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	45% 2 7% 24% 18% 5%	1660
	11th to 20th	Day	48% 4 9% 21% 16% 2	1656
	21st to end	Day	39% 3 9% 25% 20% 4	1782
February	1st to 10th	Day	47% 3 10% 22% 16% 2	1683
	11th to 20th	Day	49% 3 7% 19% 17% 5%	1758
	21st to end	Day	53% 3 6% 16% 15% 6%	1480
March	1st to 10th	Day	44% 4 10% 18% 17% 8%	1880
	11th to 20th	Day	52% 4 7% 20% 16% 2	1980
	21st to end	Day	46% 4 11% 24% 13% 1	2268
April	1st to 10th	Day	38% 6% 9% 25% 20% 3	2160
	11th to 20th	Day	38% 5% 8% 25% 18% 6%	2134
	21st to end	Day	41% 6% 9% 23% 20% 1	2160
May	1st to 10th	Day	42% 7% 11% 20% 17% 2	2160
	11th to 20th	Day	37% 7% 17% 22% 15% 2	2180
	21st to end	Day	39% 9% 14% 25% 12% 1	2725
June	1st to 10th	Day	34% 8% 13% 25% 18% 2	2520
	11th to 20th	Day	28% 7% 14% 30% 17% 4	2520
	21st to end	Day	28% 8% 14% 25% 20% 5%	2520
July	1st to 10th	Day	36% 11% 15% 22% 13% 2	2441
	11th to 20th	Day	34% 9% 17% 24% 13% 4	2271
	21st to end	Day	32% 8% 16% 31% 13% 1	2405
August	1st to 10th	Day	33% 8% 19% 27% 13% 1	2215
	11th to 20th	Day	35% 8% 14% 25% 16% 3	2125
	21st to end	Day	34% 7% 15% 25% 15% 5%	2376
September	1st to 10th	Day	35% 7% 12% 24% 17% 5%	2160
	11th to 20th	Day	36% 6% 10% 20% 24% 6%	2144
	21st to end	Day	30% 5% 9% 22% 26% 8%	1976
October	1st to 10th	Day	27% 5% 10% 24% 24% 10%	1800
	11th to 20th	Day	31% 5% 5% 22% 28% 9%	1800
	21st to end	Day	38% 3 4 24% 22% 8%	1980
November	1st to 10th	Day	30% 3 7% 26% 25% 9%	1782
	11th to 20th	Day	32% 4 7% 23% 26% 8%	1710
	21st to end	Day	42% 3 7% 20% 22% 5%	1710
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	41% 3 7% 22% 23% 4	2502
	11th to 20th	Night	47% 3 7% 20% 19% 4	2393
	21st to end	Night	37% 3 6% 26% 23% 4	2574
February	1st to 10th	Night	46% 4 8% 19% 19% 4	2275
	11th to 20th	Night	45% 3 7% 22% 18% 6%	2099
	21st to end	Night	45% 3 6% 18% 20% 8%	1776
March	1st to 10th	Night	40% 4 7% 17% 21% 11%	2095
	11th to 20th	Night	46% 4 8% 18% 18% 5%	1980
	21st to end	Night	42% 5% 9% 23% 18% 3	2088
April	1st to 10th	Night	33% 5% 11% 25% 20% 6%	1800
	11th to 20th	Night	34% 3 8% 25% 23% 7%	1775
	21st to end	Night	36% 5% 9% 24% 24% 3	1800
May	1st to 10th	Night	34% 4 13% 24% 19% 6%	1800
	11th to 20th	Night	36% 5% 14% 23% 20% 2	1709
	21st to end	Night	32% 9% 15% 25% 16% 3	1552
June	1st to 10th	Night	28% 8% 13% 25% 22% 3	1440
	11th to 20th	Night	18% 5% 15% 31% 26% 6%	1440
	21st to end	Night	21% 7% 15% 30% 21% 7%	1440
July	1st to 10th	Night	23% 10% 20% 28% 17% 2	1405
	11th to 20th	Night	26% 7% 20% 25% 15% 6%	1566
	21st to end	Night	25% 6% 17% 33% 18% 1	1673
August	1st to 10th	Night	22% 6% 18% 36% 17%	1698
	11th to 20th	Night	28% 9% 16% 26% 18% 3	1776
	21st to end	Night	29% 6% 14% 28% 17% 6%	1980
September	1st to 10th	Night	27% 6% 9% 28% 22% 8%	1800
	11th to 20th	Night	30% 7% 10% 21% 27% 6%	1800
	21st to end	Night	27% 5% 8% 24% 28% 9%	1976
October	1st to 10th	Night	22% 4 8% 29% 25% 12%	2160
	11th to 20th	Night	28% 5% 6% 20% 30% 12%	2160
	21st to end	Night	37% 3 5% 19% 27% 9%	2376
November	1st to 10th	Night	29% 3 6% 25% 27% 10%	2293
	11th to 20th	Night	30% 3 7% 23% 27% 10%	2470
	21st to end	Night	37% 4 7% 21% 27% 5%	2470
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	28% 19% 36% 14% 2	252
	21st to end	Day	17% 23% 43% 12% 4	264
February	1st to 10th	Day	24% 21% 35% 15% 3 1	240
	11th to 20th	Day	34% 24% 33% 7% 3	240
	21st to end	Day	35% 23% 30% 11% 2	198
March	1st to 10th	Day	28% 20% 31% 16% 4 1	240
	11th to 20th	Day	28% 21% 33% 16% 2	240
	21st to end	Day	25% 18% 32% 18% 6% 1	354
April	1st to 10th	Day	16% 17% 33% 24% 9% 1	420
	11th to 20th	Day	23% 13% 31% 22% 10% 2	412
	21st to end	Day	17% 15% 32% 23% 11% 2	420
May	1st to 10th	Day	17% 13% 32% 27% 10% 1	423
	11th to 20th	Day	13% 6% 29% 28% 16% 8%	451
	21st to end	Day	8% 5% 22% 31% 24% 10%	679
June	1st to 10th	Day	9% 3 18% 27% 26% 17%	630
	11th to 20th	Day	4 2 14% 41% 27% 12%	630
	21st to end	Day	6% 2 18% 34% 26% 13%	630
July	1st to 10th	Day	5% 2 13% 28% 33% 20%	621
	11th to 20th	Day	6% 1 11% 29% 33% 18%	618
	21st to end	Day	6% 2 8% 31% 36% 17%	684
August	1st to 10th	Day	7% 2 8% 33% 35% 13%	527
	11th to 20th	Day	14% 3 7% 33% 29% 14%	439
	21st to end	Day	11% 2 7% 24% 33% 24%	495
September	1st to 10th	Day	9% 1 7% 29% 38% 15%	450
	11th to 20th	Day	9% 3 14% 22% 32% 20%	450
	21st to end	Day	12% 5% 13% 35% 26% 11%	446
October	1st to 10th	Day	10% 5% 24% 29% 26% 5%	270
	11th to 20th	Day	13% 11% 34% 25% 12% 4	270
	21st to end	Day	26% 11% 30% 20% 10% 3	297
November	1st to 10th	Day	17% 11% 26% 29% 15% 3	270
	11th to 20th	Day	10% 17% 39% 25% 9% 1	270
	21st to end	Day	23% 16% 30% 19% 9% 2	270
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% 35% 23% 3	921
	21st to end	Night	19% 15% 37% 27% 3	990
February	1st to 10th	Night	25% 12% 33% 25% 4	835
	11th to 20th	Night	21% 15% 38% 23% 3	703
	21st to end	Night	26% 17% 32% 22% 3	592
March	1st to 10th	Night	21% 10% 35% 30% 5%	655
	11th to 20th	Night	19% 14% 37% 25% 5% 1	540
	21st to end	Night	19% 11% 34% 29% 7%	594
April	1st to 10th	Night	12% 12% 42% 25% 8%	540
	11th to 20th	Night	15% 9% 33% 31% 12% 1	533
	21st to end	Night	15% 7% 38% 29% 9% 2	540
May	1st to 10th	Night	17% 6% 25% 38% 12% 2	540
	11th to 20th	Night	14% 5% 29% 33% 17% 2	531
	21st to end	Night	7% 3 20% 38% 27% 5%	584
June	1st to 10th	Night	7% 1 14% 38% 33% 7%	540
	11th to 20th	Night	2 1 12% 48% 34% 3	540
	21st to end	Night	5% 1 13% 39% 37% 6%	540
July	1st to 10th	Night	2 2 9% 35% 42% 10%	525
	11th to 20th	Night	7% 1 8% 28% 44% 11%	522
	21st to end	Night	5% 1 7% 33% 44% 10%	591
August	1st to 10th	Night	5% 1 5% 32% 47% 9%	537
	11th to 20th	Night	6% 1 10% 37% 39% 7%	534
	21st to end	Night	8% 2 6% 27% 48% 10%	594
September	1st to 10th	Night	9% 2 8% 36% 40% 6%	540
	11th to 20th	Night	11% 2 13% 30% 38% 7%	540
	21st to end	Night	9% 3 15% 39% 30% 4	716
October	1st to 10th	Night	8% 5% 17% 35% 29% 5%	720
	11th to 20th	Night	12% 6% 28% 34% 17% 2	720
	21st to end	Night	20% 8% 25% 31% 15% 1	792
November	1st to 10th	Night	12% 7% 27% 36% 17% 1	740
	11th to 20th	Night	13% 8% 35% 32% 11%	760
	21st to end	Night	17% 9% 34% 28% 11% 1	760
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 2024-01-11 21:33:45. Version ac07

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