Cane Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cane Creek State Park clear sky chart from 2005-11-06 to 2024-06-17.

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 5% 4 6% 7% 43%	89018
	Night	13% 6% 2 5% 4 3 4 3 5% 6% 49%	89830
Transparency	Day	39% 7% 10% 21% 18% 5%	88789
	Night	35% 6% 10% 21% 22% 6%	89665
Seeing	Day	13% 7% 22% 25% 23% 9%	14692
	Night	14% 7% 25% 32% 20% 3	24556

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% 12% 3 7% 3 2 2 2 2 4 44%	2847
	11th to 20th	Day	20% 8% 2 5% 3 2 3 3 3 5% 47%	2850
	21st to end	Day	24% 7% 2 4 3 2 2 2 4 4 46%	3135
February	1st to 10th	Day	19% 8% 3 6% 4 4 3 3 4 6% 41%	1729
	11th to 20th	Day	19% 11% 3 6% 3 3 3 3 3 4 42%	1848
	21st to end	Day	21% 8% 3 7% 4 4 3 3 4 5% 38%	1575
March	1st to 10th	Day	18% 11% 4 9% 4 4 3 3 4 5% 35%	3436
	11th to 20th	Day	14% 7% 3 6% 4 4 4 4 6% 7% 41%	3480
	21st to end	Day	13% 8% 4 8% 5% 4 4 3 4 6% 42%	3869
April	1st to 10th	Day	11% 6% 3 6% 5% 5% 5% 4 6% 7% 44%	2280
	11th to 20th	Day	14% 7% 2 6% 4 4 4 3 5% 6% 45%	2254
	21st to end	Day	11% 7% 2 7% 5% 5% 5% 3 5% 7% 43%	2280
May	1st to 10th	Day	13% 7% 3 6% 5% 4 4 4 6% 7% 41%	3765
	11th to 20th	Day	10% 5% 2 7% 5% 5% 5% 4 7% 8% 42%	3845
	21st to end	Day	11% 6% 3 7% 5% 5% 6% 4 7% 8% 36%	4477
June	1st to 10th	Day	7% 5% 3 6% 5% 5% 6% 5% 6% 10% 42%	2636
	11th to 20th	Day	4 3 2 5% 5% 5% 6% 5% 7% 10% 49%	2607
	21st to end	Day	4 4 2 5% 4 5% 6% 5% 8% 9% 49%	2373
July	1st to 10th	Day	5% 5% 2 7% 7% 6% 7% 6% 10% 10% 34%	2340
	11th to 20th	Day	7% 4 1 6% 5% 5% 6% 6% 8% 12% 39%	2340
	21st to end	Day	6% 5% 2 6% 5% 5% 7% 7% 9% 11% 38%	2546
August	1st to 10th	Day	4 4 2 6% 6% 6% 6% 6% 8% 10% 42%	2265
	11th to 20th	Day	9% 4 2 6% 5% 5% 6% 5% 6% 10% 41%	2125
	21st to end	Day	10% 4 2 6% 5% 5% 6% 5% 7% 10% 42%	2376
September	1st to 10th	Day	8% 5% 2 6% 4 5% 6% 5% 5% 8% 44%	2160
	11th to 20th	Day	14% 5% 3 6% 4 3 5% 3 5% 7% 45%	2160
	21st to end	Day	10% 3 2 3 4 4 5% 4 5% 7% 54%	1915
October	1st to 10th	Day	7% 5% 1 5% 3 4 4 3 5% 7% 55%	1800
	11th to 20th	Day	13% 5% 2 4 3 3 3 2 5% 5% 56%	1800
	21st to end	Day	17% 5% 2 4 3 2 3 2 5% 5% 52%	1980
November	1st to 10th	Day	12% 4 1 5% 3 3 2 3 4 5% 58%	1858
	11th to 20th	Day	10% 6% 2 5% 4 3 3 3 4 5% 53%	1808
	21st to end	Day	17% 6% 2 6% 4 4 3 2 4 6% 43%	1710
December	1st to 10th	Day	16% 9% 2 6% 4 5% 4 2 5% 5% 43%	1588
	11th to 20th	Day	14% 8% 3 7% 5% 4 4 3 4 4 43%	1918
	21st to end	Day	12% 8% 3 8% 5% 5% 5% 4 4 6% 39%	3043
January	1st to 10th	Night	17% 8% 2 6% 3 3 4 2 4 5% 46%	4108
	11th to 20th	Night	18% 6% 2 5% 3 3 3 3 3 4 50%	4120
	21st to end	Night	23% 8% 2 5% 2 2 2 2 3 4 47%	4532
February	1st to 10th	Night	19% 7% 2 7% 4 3 2 3 4 5% 42%	2448
	11th to 20th	Night	19% 7% 3 5% 4 3 3 3 4 4 45%	2218
	21st to end	Night	20% 8% 2 5% 4 3 3 2 3 5% 44%	1884
March	1st to 10th	Night	18% 9% 2 6% 4 4 4 3 5% 5% 40%	3429
	11th to 20th	Night	15% 7% 2 6% 4 3 4 4 5% 7% 45%	3480
	21st to end	Night	13% 7% 2 6% 4 4 4 4 5% 6% 44%	3760
April	1st to 10th	Night	11% 4 2 5% 5% 4 4 4 5% 7% 49%	1900
	11th to 20th	Night	12% 6% 2 5% 3 4 3 3 5% 7% 49%	1875
	21st to end	Night	10% 5% 2 6% 4 4 4 3 4 6% 51%	1900
May	1st to 10th	Night	15% 7% 2 6% 5% 4 3 4 6% 8% 40%	3130
	11th to 20th	Night	15% 6% 2 4 3 3 4 3 5% 7% 46%	3048
	21st to end	Night	11% 6% 2 6% 5% 4 5% 5% 6% 8% 42%	3090
June	1st to 10th	Night	5% 4 1 4 4 5% 4 4 7% 11% 50%	1534
	11th to 20th	Night	3 3 1 3 3 3 4 4 7% 10% 59%	1496
	21st to end	Night	4 3 2 3 3 3 4 4 7% 9% 57%	1576
July	1st to 10th	Night	4 3 1 4 6% 5% 6% 6% 8% 11% 47%	1620
	11th to 20th	Night	5% 3 1 5% 4 5% 5% 4 6% 11% 50%	1620
	21st to end	Night	3 3 1 4 3 4 4 5% 8% 11% 54%	1772
August	1st to 10th	Night	3 3 2 4 3 4 4 4 8% 12% 53%	1672
	11th to 20th	Night	5% 5% 1 6% 3 4 4 4 7% 11% 50%	1776
	21st to end	Night	7% 4 2 4 4 4 5% 4 7% 9% 49%	1980
September	1st to 10th	Night	8% 5% 2 5% 3 3 4 3 6% 9% 52%	1800
	11th to 20th	Night	11% 5% 2 4 4 4 6% 4 4 7% 51%	1800
	21st to end	Night	9% 3 1 3 3 3 2 3 5% 8% 59%	2022
October	1st to 10th	Night	8% 2 1 4 3 3 4 3 5% 7% 61%	2160
	11th to 20th	Night	11% 4 1 5% 3 2 3 2 4 5% 58%	2160
	21st to end	Night	14% 5% 1 5% 3 3 2 3 3 5% 55%	2376
November	1st to 10th	Night	10% 5% 2 4 3 4 3 2 5% 5% 58%	2220
	11th to 20th	Night	11% 5% 2 5% 4 3 3 3 4 5% 56%	2368
	21st to end	Night	13% 7% 2 4 4 3 4 3 5% 5% 49%	2470
December	1st to 10th	Night	16% 6% 2 6% 3 3 4 3 5% 5% 46%	2588
	11th to 20th	Night	15% 7% 2 5% 4 3 4 3 4 4 49%	3279
	21st to end	Night	14% 8% 3 8% 4 4 4 3 4 5% 43%	4619

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	47% 3 4 19% 23% 4	2848
	11th to 20th	Day	41% 3 11% 22% 20% 2	2850
	21st to end	Day	43% 3 6% 17% 25% 6%	3135
February	1st to 10th	Day	46% 4 8% 20% 17% 5%	1729
	11th to 20th	Day	47% 4 5% 18% 19% 7%	1858
	21st to end	Day	50% 4 7% 14% 17% 8%	1575
March	1st to 10th	Day	51% 5% 7% 11% 19% 7%	3436
	11th to 20th	Day	41% 7% 8% 23% 15% 7%	3480
	21st to end	Day	43% 4 7% 22% 21% 2	3869
April	1st to 10th	Day	39% 6% 9% 21% 19% 6%	2280
	11th to 20th	Day	39% 5% 9% 19% 20% 7%	2254
	21st to end	Day	40% 7% 9% 19% 23% 2	2280
May	1st to 10th	Day	40% 7% 12% 25% 13% 3	3800
	11th to 20th	Day	36% 9% 13% 25% 15% 2	3849
	21st to end	Day	42% 8% 14% 23% 11% 2	4489
June	1st to 10th	Day	35% 9% 13% 25% 16% 1	2636
	11th to 20th	Day	29% 8% 12% 29% 19% 3	2607
	21st to end	Day	28% 9% 14% 26% 20% 3	2373
July	1st to 10th	Day	36% 14% 16% 20% 11% 2	2276
	11th to 20th	Day	32% 11% 16% 26% 12% 3	2271
	21st to end	Day	33% 12% 16% 27% 10% 1	2405
August	1st to 10th	Day	31% 10% 19% 26% 13% 1	2251
	11th to 20th	Day	36% 9% 14% 23% 15% 3	2125
	21st to end	Day	34% 9% 17% 21% 14% 4	2376
September	1st to 10th	Day	35% 9% 12% 20% 17% 7%	2160
	11th to 20th	Day	38% 7% 10% 17% 22% 7%	2160
	21st to end	Day	28% 6% 10% 21% 24% 10%	1915
October	1st to 10th	Day	27% 6% 11% 23% 22% 11%	1800
	11th to 20th	Day	32% 3 7% 18% 30% 11%	1800
	21st to end	Day	34% 4 5% 19% 26% 11%	1980
November	1st to 10th	Day	30% 4 7% 21% 29% 9%	1858
	11th to 20th	Day	33% 5% 7% 19% 26% 11%	1808
	21st to end	Day	43% 4 7% 17% 23% 6%	1710
December	1st to 10th	Day	44% 5% 7% 18% 19% 7%	1588
	11th to 20th	Day	46% 3 6% 18% 23% 5%	1915
	21st to end	Day	44% 5% 9% 17% 19% 5%	3043
January	1st to 10th	Night	41% 4 6% 18% 27% 4	4108
	11th to 20th	Night	38% 5% 7% 21% 22% 7%	4120
	21st to end	Night	43% 3 9% 18% 23% 5%	4532
February	1st to 10th	Night	45% 4 8% 17% 20% 6%	2448
	11th to 20th	Night	44% 4 6% 19% 19% 8%	2219
	21st to end	Night	44% 5% 5% 15% 20% 10%	1884
March	1st to 10th	Night	44% 6% 8% 13% 17% 11%	3429
	11th to 20th	Night	38% 7% 9% 20% 18% 9%	3480
	21st to end	Night	39% 6% 8% 19% 25% 3	3760
April	1st to 10th	Night	34% 5% 10% 22% 18% 10%	1900
	11th to 20th	Night	34% 5% 8% 20% 23% 9%	1875
	21st to end	Night	34% 6% 8% 25% 24% 4	1900
May	1st to 10th	Night	39% 7% 12% 24% 14% 3	3160
	11th to 20th	Night	36% 8% 10% 28% 17% 1	3049
	21st to end	Night	37% 10% 14% 23% 15% 1	3099
June	1st to 10th	Night	27% 8% 17% 28% 19% 1	1534
	11th to 20th	Night	19% 6% 16% 30% 25% 4	1496
	21st to end	Night	21% 8% 14% 29% 24% 4	1576
July	1st to 10th	Night	26% 11% 21% 26% 12% 4	1575
	11th to 20th	Night	24% 10% 21% 27% 14% 4	1566
	21st to end	Night	21% 9% 19% 35% 16% 1	1673
August	1st to 10th	Night	21% 8% 23% 32% 16%	1662
	11th to 20th	Night	27% 8% 17% 27% 17% 4	1776
	21st to end	Night	28% 9% 16% 24% 19% 4	1980
September	1st to 10th	Night	28% 8% 12% 24% 21% 7%	1800
	11th to 20th	Night	33% 6% 10% 19% 25% 7%	1800
	21st to end	Night	25% 4 9% 23% 27% 12%	2022
October	1st to 10th	Night	23% 5% 11% 23% 25% 14%	2160
	11th to 20th	Night	29% 4 7% 17% 29% 14%	2160
	21st to end	Night	34% 3 6% 18% 27% 11%	2376
November	1st to 10th	Night	30% 4 7% 20% 28% 11%	2220
	11th to 20th	Night	31% 4 6% 20% 27% 12%	2368
	21st to end	Night	36% 5% 8% 18% 27% 8%	2470
December	1st to 10th	Night	39% 5% 9% 20% 19% 7%	2588
	11th to 20th	Night	39% 4 6% 17% 26% 8%	3281
	21st to end	Night	42% 5% 8% 19% 22% 4	4619

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	24% 14% 37% 17% 6% 1	270
	11th to 20th	Day	25% 16% 41% 13% 3 1	270
	21st to end	Day	21% 18% 39% 15% 6% 1	297
February	1st to 10th	Day	23% 16% 37% 16% 8% 1	270
	11th to 20th	Day	31% 17% 34% 14% 4	270
	21st to end	Day	33% 20% 31% 12% 4	225
March	1st to 10th	Day	24% 16% 33% 20% 7%	270
	11th to 20th	Day	21% 17% 41% 16% 4	270
	21st to end	Day	15% 21% 36% 20% 7%	327
April	1st to 10th	Day	14% 18% 37% 23% 8%	460
	11th to 20th	Day	19% 13% 34% 22% 10% 1	452
	21st to end	Day	14% 12% 32% 26% 13% 3	460
May	1st to 10th	Day	14% 12% 29% 30% 13% 2	463
	11th to 20th	Day	11% 4 26% 30% 23% 6%	529
	21st to end	Day	8% 6% 20% 35% 24% 7%	734
June	1st to 10th	Day	9% 4 15% 32% 31% 11%	680
	11th to 20th	Day	4 2 13% 35% 34% 12%	662
	21st to end	Day	6% 1 13% 33% 30% 16%	630
July	1st to 10th	Day	6% 1 9% 28% 39% 17%	621
	11th to 20th	Day	7% 1 6% 28% 35% 21%	618
	21st to end	Day	5% 1 8% 24% 39% 22%	684
August	1st to 10th	Day	5% 1 8% 25% 44% 17%	563
	11th to 20th	Day	12% 1 8% 23% 41% 16%	439
	21st to end	Day	12% 1 5% 19% 37% 27%	495
September	1st to 10th	Day	10% 2 7% 23% 37% 22%	450
	11th to 20th	Day	12% 2 10% 22% 31% 23%	450
	21st to end	Day	14% 2 9% 30% 27% 17%	349
October	1st to 10th	Day	9% 1 25% 27% 30% 8%	270
	11th to 20th	Day	11% 5% 34% 30% 16% 3	270
	21st to end	Day	22% 8% 28% 28% 11% 3	297
November	1st to 10th	Day	17% 7% 25% 31% 18% 2	270
	11th to 20th	Day	14% 8% 36% 31% 10% 1	270
	21st to end	Day	23% 14% 27% 21% 12% 3	270
December	1st to 10th	Day	20% 16% 34% 21% 7% 2	270
	11th to 20th	Day	25% 11% 31% 21% 11% 1	270
	21st to end	Day	20% 18% 37% 21% 4 1	297
January	1st to 10th	Night	20% 11% 37% 27% 5%	950
	11th to 20th	Night	21% 11% 38% 24% 5%	950
	21st to end	Night	20% 10% 39% 28% 3	1045
February	1st to 10th	Night	23% 11% 36% 26% 5%	928
	11th to 20th	Night	23% 11% 37% 26% 3	743
	21st to end	Night	24% 18% 34% 22% 2	628
March	1st to 10th	Night	19% 11% 32% 31% 7%	580
	11th to 20th	Night	19% 11% 35% 29% 6% 1	570
	21st to end	Night	19% 10% 34% 30% 7%	627
April	1st to 10th	Night	12% 12% 37% 30% 8%	570
	11th to 20th	Night	14% 9% 37% 29% 10% 1	563
	21st to end	Night	13% 6% 37% 31% 12% 1	570
May	1st to 10th	Night	11% 6% 24% 44% 14% 1	570
	11th to 20th	Night	15% 3 25% 36% 19% 2	561
	21st to end	Night	7% 2 24% 38% 25% 5%	617
June	1st to 10th	Night	5% 2 10% 40% 37% 5%	570
	11th to 20th	Night	3 1 10% 38% 43% 4	561
	21st to end	Night	4 1 9% 36% 42% 8%	540
July	1st to 10th	Night	3 1 6% 32% 46% 11%	525
	11th to 20th	Night	4 1 4 32% 49% 10%	522
	21st to end	Night	3 1 5% 34% 46% 12%	591
August	1st to 10th	Night	4 1 5% 32% 48% 10%	537
	11th to 20th	Night	7% 1 6% 33% 45% 8%	534
	21st to end	Night	8% 1 6% 27% 49% 9%	594
September	1st to 10th	Night	9% 1 7% 34% 42% 6%	540
	11th to 20th	Night	11% 2 10% 28% 39% 9%	540
	21st to end	Night	11% 3 11% 35% 37% 4	665
October	1st to 10th	Night	8% 3 13% 38% 33% 5%	720
	11th to 20th	Night	12% 5% 24% 38% 19% 2	720
	21st to end	Night	17% 7% 25% 31% 18% 2	792
November	1st to 10th	Night	11% 5% 27% 35% 21% 1	740
	11th to 20th	Night	12% 7% 32% 37% 12%	760
	21st to end	Night	15% 8% 34% 30% 12% 2	760
December	1st to 10th	Night	20% 10% 32% 30% 8%	878
	11th to 20th	Night	22% 10% 29% 33% 7%	950
	21st to end	Night	22% 12% 33% 27% 5%	1045

Page generated at 2024-06-14 12:06:12. Version ac07

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