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 2024-01-14.

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% 5% 7% 44%	74602
	Night	12% 5% 2 4 4 3 4 4 5% 7% 50%	75148
Transparency	Day	38% 7% 11% 21% 19% 5%	74326
	Night	34% 6% 10% 22% 22% 7%	74945
Seeing	Day	13% 7% 21% 26% 23% 10%	14116
	Night	14% 7% 25% 32% 20% 3	24017

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% 9% 3 6% 4 2 3 3 3 4 45%	1707
	11th to 20th	Day	18% 8% 2 6% 4 2 4 4 4 6% 42%	1647
	21st to end	Day	16% 6% 2 4 4 2 3 3 4 5% 50%	1782
February	1st to 10th	Day	18% 8% 2 5% 5% 3 3 4 3 6% 41%	1638
	11th to 20th	Day	19% 10% 4 6% 4 2 4 3 3 5% 41%	1748
	21st to end	Day	22% 7% 4 6% 5% 3 4 3 4 5% 37%	1484
March	1st to 10th	Day	17% 6% 4 7% 4 3 4 4 4 5% 42%	1980
	11th to 20th	Day	16% 6% 4 6% 5% 3 5% 4 5% 6% 39%	1980
	21st to end	Day	12% 6% 3 6% 6% 3 5% 5% 5% 7% 41%	2206
April	1st to 10th	Day	11% 5% 3 5% 6% 4 5% 5% 5% 7% 45%	2160
	11th to 20th	Day	14% 6% 2 6% 4 3 4 4 5% 6% 46%	2134
	21st to end	Day	11% 6% 3 6% 6% 4 5% 4 5% 7% 44%	2160
May	1st to 10th	Day	15% 6% 4 5% 5% 3 4 4 5% 6% 43%	2160
	11th to 20th	Day	10% 4 2 6% 6% 4 5% 6% 7% 9% 40%	2163
	21st to end	Day	8% 5% 3 6% 6% 4 7% 6% 7% 9% 40%	2531
June	1st to 10th	Day	7% 4 3 6% 5% 4 6% 7% 6% 10% 42%	2497
	11th to 20th	Day	5% 3 2 5% 6% 4 6% 6% 7% 10% 48%	2520
	21st to end	Day	4 3 2 5% 4 4 6% 6% 8% 9% 49%	2373
July	1st to 10th	Day	5% 4 2 7% 8% 4 7% 8% 10% 10% 34%	2340
	11th to 20th	Day	7% 4 2 5% 6% 3 6% 8% 8% 12% 40%	2340
	21st to end	Day	6% 4 2 5% 6% 4 7% 8% 8% 11% 39%	2546
August	1st to 10th	Day	4 4 3 4 7% 4 6% 8% 8% 10% 42%	2265
	11th to 20th	Day	9% 4 2 5% 6% 4 6% 7% 6% 10% 41%	2125
	21st to end	Day	10% 3 2 5% 5% 3 6% 6% 7% 10% 42%	2376
September	1st to 10th	Day	8% 5% 3 5% 5% 4 6% 6% 5% 8% 44%	2160
	11th to 20th	Day	14% 5% 3 4 5% 3 4 5% 5% 7% 45%	2160
	21st to end	Day	10% 3 2 3 4 2 5% 5% 5% 7% 54%	1915
October	1st to 10th	Day	7% 5% 1 4 4 3 4 4 5% 7% 56%	1800
	11th to 20th	Day	13% 5% 2 4 3 2 3 2 5% 5% 56%	1800
	21st to end	Day	17% 5% 2 3 3 2 3 3 5% 5% 52%	1980
November	1st to 10th	Day	12% 4 1 4 4 2 3 3 4 5% 58%	1858
	11th to 20th	Day	10% 6% 2 5% 4 2 3 4 4 5% 53%	1808
	21st to end	Day	18% 6% 3 5% 5% 3 3 3 4 7% 44%	1710
December	1st to 10th	Day	16% 8% 2 6% 5% 4 5% 3 5% 5% 43%	1588
	11th to 20th	Day	14% 8% 4 6% 5% 3 4 5% 4 5% 43%	1918
	21st to end	Day	12% 8% 3 7% 6% 4 6% 5% 4 6% 40%	3043
January	1st to 10th	Night	17% 6% 2 5% 3 2 3 3 4 6% 49%	2458
	11th to 20th	Night	17% 8% 2 6% 4 2 3 4 4 5% 45%	2386
	21st to end	Night	17% 7% 2 5% 3 2 3 3 5% 5% 49%	2574
February	1st to 10th	Night	19% 7% 3 6% 5% 3 3 3 4 5% 43%	2319
	11th to 20th	Night	20% 6% 3 4 5% 2 3 4 4 4 45%	2098
	21st to end	Night	22% 8% 2 5% 4 2 3 3 3 5% 43%	1776
March	1st to 10th	Night	15% 6% 2 5% 4 3 4 4 5% 6% 45%	1990
	11th to 20th	Night	15% 7% 3 5% 5% 3 4 5% 5% 6% 43%	1980
	21st to end	Night	15% 6% 3 4 4 2 4 4 4 6% 47%	2148
April	1st to 10th	Night	11% 4 2 4 5% 3 4 5% 5% 8% 49%	1800
	11th to 20th	Night	11% 6% 2 5% 4 2 4 4 5% 8% 50%	1775
	21st to end	Night	11% 5% 2 4 5% 3 4 3 4 7% 52%	1800
May	1st to 10th	Night	10% 4 2 4 4 3 4 4 7% 8% 50%	1800
	11th to 20th	Night	12% 5% 3 3 4 3 4 4 6% 7% 49%	1727
	21st to end	Night	6% 5% 2 5% 5% 2 4 5% 7% 9% 50%	1745
June	1st to 10th	Night	5% 4 2 4 5% 4 4 4 7% 11% 50%	1454
	11th to 20th	Night	3 2 1 3 3 3 4 4 7% 10% 59%	1440
	21st to end	Night	5% 2 2 3 3 2 4 5% 7% 9% 58%	1576
July	1st to 10th	Night	4 2 2 3 6% 4 6% 7% 7% 11% 48%	1620
	11th to 20th	Night	5% 3 1 4 4 4 5% 5% 6% 12% 51%	1620
	21st to end	Night	3 2 1 3 4 3 4 5% 7% 12% 55%	1772
August	1st to 10th	Night	3 3 2 3 4 3 5% 5% 8% 12% 53%	1672
	11th to 20th	Night	5% 4 2 5% 4 3 4 5% 7% 11% 51%	1776
	21st to end	Night	7% 4 2 3 4 3 5% 6% 7% 9% 49%	1980
September	1st to 10th	Night	8% 5% 2 4 4 2 4 5% 5% 10% 52%	1800
	11th to 20th	Night	11% 5% 2 4 5% 2 6% 4 4 7% 51%	1800
	21st to end	Night	9% 3 2 3 3 2 3 3 5% 8% 59%	2022
October	1st to 10th	Night	8% 2 1 3 3 2 3 4 5% 7% 61%	2160
	11th to 20th	Night	11% 4 2 4 4 2 2 3 4 5% 59%	2160
	21st to end	Night	14% 5% 2 4 4 2 2 3 3 5% 55%	2376
November	1st to 10th	Night	10% 4 3 3 3 3 3 3 5% 5% 58%	2220
	11th to 20th	Night	11% 4 2 4 4 2 3 4 4 6% 56%	2368
	21st to end	Night	13% 7% 2 4 4 3 4 4 5% 6% 50%	2470
December	1st to 10th	Night	16% 6% 3 5% 4 2 4 4 5% 5% 46%	2588
	11th to 20th	Night	15% 7% 2 4 5% 2 4 4 4 5% 49%	3279
	21st to end	Night	14% 8% 3 6% 5% 3 4 4 4 5% 44%	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	46% 3 6% 20% 18% 7%	1708
	11th to 20th	Day	45% 3 7% 22% 20% 4	1647
	21st to end	Day	38% 3 6% 22% 26% 5%	1782
February	1st to 10th	Day	45% 4 8% 20% 17% 5%	1638
	11th to 20th	Day	48% 4 6% 18% 18% 6%	1758
	21st to end	Day	51% 4 7% 13% 18% 8%	1484
March	1st to 10th	Day	44% 4 9% 15% 18% 9%	1980
	11th to 20th	Day	46% 6% 8% 21% 15% 4	1980
	21st to end	Day	42% 6% 10% 23% 17% 2	2206
April	1st to 10th	Day	38% 6% 9% 22% 19% 5%	2160
	11th to 20th	Day	39% 5% 8% 20% 21% 6%	2134
	21st to end	Day	40% 7% 9% 19% 23% 2	2160
May	1st to 10th	Day	42% 6% 10% 19% 19% 5%	2160
	11th to 20th	Day	38% 8% 14% 25% 13% 2	2167
	21st to end	Day	37% 9% 17% 24% 14%	2531
June	1st to 10th	Day	35% 10% 13% 25% 15% 1	2497
	11th to 20th	Day	30% 8% 12% 29% 19% 2	2520
	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	39% 3 7% 20% 25% 6%	2458
	11th to 20th	Night	43% 5% 7% 19% 20% 7%	2386
	21st to end	Night	38% 4 6% 20% 27% 6%	2574
February	1st to 10th	Night	45% 4 8% 17% 21% 6%	2319
	11th to 20th	Night	44% 4 6% 20% 19% 7%	2099
	21st to end	Night	46% 4 5% 14% 20% 10%	1776
March	1st to 10th	Night	39% 5% 8% 16% 20% 12%	1990
	11th to 20th	Night	42% 6% 10% 18% 18% 6%	1980
	21st to end	Night	38% 5% 8% 22% 22% 4	2148
April	1st to 10th	Night	34% 5% 10% 23% 19% 9%	1800
	11th to 20th	Night	33% 5% 9% 21% 24% 9%	1775
	21st to end	Night	33% 6% 8% 25% 24% 4	1800
May	1st to 10th	Night	31% 6% 12% 26% 19% 6%	1800
	11th to 20th	Night	33% 7% 13% 26% 19% 2	1728
	21st to end	Night	29% 8% 16% 27% 18% 2	1746
June	1st to 10th	Night	27% 7% 16% 28% 19% 1	1454
	11th to 20th	Night	19% 6% 16% 30% 25% 3	1440
	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	24% 16% 42% 14% 3 1	249
	21st to end	Day	19% 19% 40% 16% 5% 1	264
February	1st to 10th	Day	22% 16% 37% 15% 9% 1	240
	11th to 20th	Day	33% 17% 35% 13% 2	240
	21st to end	Day	34% 18% 30% 14% 4	198
March	1st to 10th	Day	26% 15% 32% 20% 7%	240
	11th to 20th	Day	23% 16% 41% 15% 5%	240
	21st to end	Day	14% 23% 34% 21% 8%	292
April	1st to 10th	Day	13% 15% 39% 24% 9%	420
	11th to 20th	Day	19% 12% 33% 24% 11% 1	412
	21st to end	Day	15% 11% 32% 27% 13% 2	420
May	1st to 10th	Day	14% 12% 28% 30% 13% 2	423
	11th to 20th	Day	12% 4 26% 29% 23% 6%	486
	21st to end	Day	8% 5% 18% 36% 26% 8%	679
June	1st to 10th	Day	9% 3 14% 31% 32% 12%	630
	11th to 20th	Day	4 2 13% 36% 34% 11%	630
	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% 37% 25% 6%	918
	21st to end	Night	19% 10% 39% 28% 3	990
February	1st to 10th	Night	22% 11% 37% 26% 4	879
	11th to 20th	Night	23% 12% 37% 25% 3	703
	21st to end	Night	24% 17% 33% 23% 2	592
March	1st to 10th	Night	19% 11% 31% 32% 6%	550
	11th to 20th	Night	19% 11% 34% 30% 6% 1	540
	21st to end	Night	20% 9% 33% 30% 7%	594
April	1st to 10th	Night	12% 10% 37% 32% 9%	540
	11th to 20th	Night	13% 9% 36% 29% 11% 1	533
	21st to end	Night	12% 6% 37% 31% 12% 1	540
May	1st to 10th	Night	11% 6% 24% 44% 14% 1	540
	11th to 20th	Night	15% 3 26% 34% 20% 2	531
	21st to end	Night	7% 2 21% 39% 27% 5%	584
June	1st to 10th	Night	5% 2 10% 39% 39% 5%	540
	11th to 20th	Night	3 1 10% 38% 43% 4	540
	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 2024-01-11 03:22:40. Version ac07

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