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 2026-01-17.

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 4 4 6% 7% 45%	126329
	Night	13% 6% 2 5% 4 3 4 3 5% 6% 49%	125536
Transparency	Day	37% 6% 10% 22% 19% 6%	129935
	Night	34% 5% 10% 22% 21% 8%	130007
Seeing	Day	13% 8% 22% 26% 22% 9%	16837
	Night	14% 7% 25% 32% 19% 3	26674

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	16% 10% 3 8% 3 2 2 2 3 4 46%	4167
	11th to 20th	Day	16% 6% 1 5% 2 2 3 3 3 5% 53%	4134
	21st to end	Day	21% 7% 2 4 3 2 2 2 3 4 50%	4488
February	1st to 10th	Day	19% 8% 3 6% 4 3 3 3 4 6% 40%	1821
	11th to 20th	Day	19% 10% 3 6% 3 3 3 3 3 5% 41%	1948
	21st to end	Day	20% 8% 3 7% 4 4 3 3 4 6% 39%	1655
March	1st to 10th	Day	20% 10% 4 8% 4 4 3 3 4 5% 36%	4936
	11th to 20th	Day	11% 5% 2 5% 4 3 3 3 5% 7% 51%	4980
	21st to end	Day	12% 7% 3 8% 5% 4 4 3 5% 6% 42%	5545
April	1st to 10th	Day	12% 6% 3 6% 5% 5% 5% 4 6% 7% 43%	2400
	11th to 20th	Day	14% 6% 2 6% 4 4 4 3 5% 6% 46%	2374
	21st to end	Day	11% 7% 2 7% 5% 5% 5% 4 6% 7% 42%	2400
May	1st to 10th	Day	15% 8% 3 7% 5% 4 5% 4 5% 6% 38%	5405
	11th to 20th	Day	12% 6% 3 8% 5% 5% 5% 4 7% 8% 37%	5513
	21st to end	Day	12% 6% 3 7% 5% 5% 6% 4 7% 8% 37%	6434
June	1st to 10th	Day	7% 5% 3 6% 5% 5% 6% 5% 6% 10% 42%	2775
	11th to 20th	Day	5% 4 2 5% 5% 5% 6% 4 7% 10% 46%	2800
	21st to end	Day	4 4 2 5% 4 5% 6% 5% 8% 10% 48%	2635
July	1st to 10th	Day	6% 5% 2 7% 6% 6% 6% 6% 10% 11% 35%	5900
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 5% 8% 12% 44%	5900
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 7% 9% 39%	6422
August	1st to 10th	Day	2 2 1 3 3 4 4 4 6% 8% 63%	4111
	11th to 20th	Day	6% 3 2 7% 4 5% 6% 6% 8% 11% 43%	3849
	21st to end	Day	7% 4 2 6% 4 5% 5% 5% 7% 8% 47%	4312
September	1st to 10th	Day	9% 5% 2 6% 4 5% 6% 5% 5% 8% 44%	2400
	11th to 20th	Day	13% 5% 3 6% 4 4 5% 3 5% 7% 44%	2400
	21st to end	Day	10% 4 2 4 4 4 5% 4 5% 7% 52%	2127
October	1st to 10th	Day	7% 4 1 5% 3 3 4 3 5% 7% 58%	2000
	11th to 20th	Day	12% 5% 1 4 3 2 3 2 4 5% 60%	2000
	21st to end	Day	17% 5% 2 4 2 2 3 2 5% 5% 53%	2200
November	1st to 10th	Day	14% 5% 1 5% 3 3 2 2 4 5% 56%	2058
	11th to 20th	Day	10% 6% 2 5% 4 3 3 3 4 5% 54%	1998
	21st to end	Day	16% 7% 2 6% 4 4 3 3 4 6% 44%	1890
December	1st to 10th	Day	19% 8% 2 5% 3 4 3 2 4 4 46%	2800
	11th to 20th	Day	19% 9% 3 6% 4 3 3 3 3 5% 42%	3088
	21st to end	Day	14% 8% 2 7% 4 4 5% 3 4 5% 43%	4464
January	1st to 10th	Night	17% 6% 2 5% 3 3 3 2 4 4 51%	6018
	11th to 20th	Night	13% 6% 2 5% 3 2 3 2 3 4 58%	5979
	21st to end	Night	23% 8% 2 5% 3 2 3 3 4 4 44%	6490
February	1st to 10th	Night	19% 7% 2 7% 4 3 2 3 4 5% 43%	2576
	11th to 20th	Night	20% 7% 3 5% 4 3 3 3 4 4 44%	2338
	21st to end	Night	19% 8% 2 5% 4 3 3 2 3 5% 45%	1980
March	1st to 10th	Night	17% 8% 2 6% 4 4 4 3 4 5% 43%	4929
	11th to 20th	Night	11% 5% 2 5% 4 4 4 4 6% 7% 48%	4980
	21st to end	Night	14% 7% 3 6% 4 4 4 4 5% 6% 43%	5382
April	1st to 10th	Night	12% 5% 2 5% 4 4 4 4 5% 7% 48%	2000
	11th to 20th	Night	11% 6% 2 5% 3 3 3 3 5% 8% 50%	1975
	21st to end	Night	10% 6% 2 6% 4 5% 4 3 5% 6% 50%	2000
May	1st to 10th	Night	17% 7% 3 6% 5% 4 3 4 6% 8% 37%	4490
	11th to 20th	Night	18% 8% 3 7% 5% 4 4 3 5% 7% 36%	4369
	21st to end	Night	13% 7% 3 7% 5% 4 4 4 6% 7% 41%	4443
June	1st to 10th	Night	5% 4 1 5% 4 5% 4 4 7% 11% 50%	1615
	11th to 20th	Night	4 3 1 4 4 4 5% 4 7% 9% 56%	1600
	21st to end	Night	4 3 1 4 3 4 4 4 7% 9% 57%	1752
July	1st to 10th	Night	5% 4 2 6% 6% 5% 6% 5% 9% 11% 42%	4078
	11th to 20th	Night	5% 3 1 4 4 4 5% 4 7% 13% 50%	4077
	21st to end	Night	9% 6% 2 6% 3 4 4 4 7% 10% 46%	4449
August	1st to 10th	Night	2 2 1 3 2 2 2 3 5% 7% 72%	3043
	11th to 20th	Night	4 3 1 4 3 4 4 5% 7% 11% 54%	3200
	21st to end	Night	5% 4 1 5% 4 4 5% 4 6% 8% 53%	3586
September	1st to 10th	Night	8% 5% 2 5% 3 4 5% 3 6% 9% 51%	2000
	11th to 20th	Night	11% 5% 2 4 4 4 6% 4 4 7% 50%	2000
	21st to end	Night	9% 4 1 4 3 3 3 3 5% 8% 58%	2248
October	1st to 10th	Night	8% 2 1 3 3 2 3 3 5% 7% 63%	2400
	11th to 20th	Night	10% 4 1 4 3 2 3 2 4 5% 61%	2400
	21st to end	Night	14% 5% 1 5% 3 3 2 2 3 5% 55%	2640
November	1st to 10th	Night	12% 5% 2 4 3 4 3 2 5% 5% 56%	2460
	11th to 20th	Night	10% 5% 2 5% 4 3 3 3 4 5% 57%	2618
	21st to end	Night	12% 7% 2 5% 4 3 4 3 5% 5% 50%	2730
December	1st to 10th	Night	16% 6% 2 5% 3 3 3 3 4 4 50%	4602
	11th to 20th	Night	16% 8% 2 6% 4 4 4 3 4 4 46%	5339
	21st to end	Night	16% 8% 2 7% 4 3 3 3 4 5% 44%	6750

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% 25% 18% 3	4168
	11th to 20th	Day	35% 3 9% 23% 25% 4	4134
	21st to end	Day	40% 3 6% 15% 27% 10%	4488
February	1st to 10th	Day	46% 4 7% 19% 18% 5%	1821
	11th to 20th	Day	47% 4 6% 18% 18% 6%	1958
	21st to end	Day	48% 4 7% 14% 18% 9%	1655
March	1st to 10th	Day	51% 4 5% 13% 17% 10%	4936
	11th to 20th	Day	32% 6% 6% 18% 23% 15%	4980
	21st to end	Day	43% 4 8% 23% 20% 3	5547
April	1st to 10th	Day	39% 6% 9% 21% 19% 6%	2400
	11th to 20th	Day	39% 5% 8% 20% 21% 7%	2374
	21st to end	Day	40% 8% 10% 19% 22% 2	2400
May	1st to 10th	Day	44% 7% 10% 25% 12% 2	5440
	11th to 20th	Day	41% 8% 13% 22% 14% 2	5517
	21st to end	Day	42% 7% 14% 21% 13% 3	6447
June	1st to 10th	Day	35% 9% 13% 25% 17% 1	2775
	11th to 20th	Day	31% 8% 12% 28% 18% 3	2800
	21st to end	Day	27% 9% 15% 27% 19% 3	2635
July	1st to 10th	Day	36% 10% 18% 23% 11% 1	5836
	11th to 20th	Day	28% 9% 20% 32% 9% 1	5831
	21st to end	Day	38% 8% 15% 29% 10%	6240
August	1st to 10th	Day	18% 6% 16% 30% 27% 3	4097
	11th to 20th	Day	32% 8% 16% 32% 10% 2	3885
	21st to end	Day	32% 7% 13% 23% 22% 3	4311
September	1st to 10th	Day	35% 9% 12% 19% 17% 8%	2400
	11th to 20th	Day	38% 7% 10% 19% 21% 6%	2400
	21st to end	Day	28% 6% 11% 21% 24% 10%	2127
October	1st to 10th	Day	16% 3 6% 14% 24% 36%	3260
	11th to 20th	Day	18% 2 4 18% 36% 23%	3240
	21st to end	Day	28% 4 5% 20% 32% 11%	3538
November	1st to 10th	Day	33% 4 7% 20% 28% 8%	2058
	11th to 20th	Day	32% 4 8% 20% 25% 11%	1998
	21st to end	Day	42% 4 6% 18% 23% 6%	1890
December	1st to 10th	Day	43% 4 5% 24% 21% 4	2800
	11th to 20th	Day	47% 2 4 20% 20% 6%	3085
	21st to end	Day	42% 4 8% 23% 20% 3	4464
January	1st to 10th	Night	38% 3 7% 27% 23% 3	6018
	11th to 20th	Night	32% 4 5% 22% 28% 9%	5979
	21st to end	Night	44% 3 8% 17% 21% 7%	6490
February	1st to 10th	Night	45% 4 7% 17% 21% 6%	2576
	11th to 20th	Night	45% 4 6% 19% 18% 8%	2339
	21st to end	Night	43% 5% 6% 15% 21% 11%	1980
March	1st to 10th	Night	43% 5% 6% 13% 19% 12%	4929
	11th to 20th	Night	34% 6% 8% 18% 17% 17%	4980
	21st to end	Night	40% 5% 7% 22% 21% 5%	5382
April	1st to 10th	Night	35% 5% 9% 23% 18% 10%	2000
	11th to 20th	Night	33% 5% 9% 21% 23% 9%	1975
	21st to end	Night	35% 6% 8% 25% 23% 4	2000
May	1st to 10th	Night	44% 6% 13% 21% 14% 2	4520
	11th to 20th	Night	47% 7% 10% 23% 12% 1	4370
	21st to end	Night	40% 8% 13% 20% 15% 4	4452
June	1st to 10th	Night	27% 8% 16% 28% 19% 1	1615
	11th to 20th	Night	23% 6% 16% 28% 23% 4	1600
	21st to end	Night	21% 7% 15% 31% 22% 4	1752
July	1st to 10th	Night	32% 9% 19% 26% 12% 1	4035
	11th to 20th	Night	23% 9% 23% 32% 11% 2	4026
	21st to end	Night	32% 6% 17% 30% 14%	4320
August	1st to 10th	Night	12% 5% 14% 33% 32% 4	3033
	11th to 20th	Night	22% 7% 21% 32% 15% 3	3230
	21st to end	Night	27% 7% 12% 22% 28% 4	3586
September	1st to 10th	Night	29% 9% 12% 23% 20% 8%	2000
	11th to 20th	Night	33% 6% 10% 20% 24% 7%	2000
	21st to end	Night	25% 5% 10% 23% 26% 12%	2248
October	1st to 10th	Night	14% 3 6% 17% 24% 36%	3920
	11th to 20th	Night	17% 2 4 15% 33% 29%	3899
	21st to end	Night	25% 3 5% 19% 33% 15%	4252
November	1st to 10th	Night	32% 3 7% 20% 27% 11%	2460
	11th to 20th	Night	30% 3 7% 21% 27% 12%	2618
	21st to end	Night	35% 5% 8% 19% 26% 8%	2730
December	1st to 10th	Night	37% 4 6% 28% 21% 4	4602
	11th to 20th	Night	43% 4 7% 18% 21% 7%	5341
	21st to end	Night	42% 4 8% 22% 21% 3	6750

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	25% 15% 39% 16% 5% 1	330
	11th to 20th	Day	24% 17% 42% 14% 3 1	318
	21st to end	Day	21% 18% 40% 15% 6% 1	330
February	1st to 10th	Day	23% 17% 36% 16% 7% 1	300
	11th to 20th	Day	32% 19% 33% 13% 3	300
	21st to end	Day	30% 20% 33% 13% 4	249
March	1st to 10th	Day	26% 16% 32% 19% 6%	300
	11th to 20th	Day	22% 18% 42% 15% 4	300
	21st to end	Day	15% 23% 36% 20% 6%	362
April	1st to 10th	Day	16% 18% 37% 22% 7%	500
	11th to 20th	Day	19% 14% 35% 21% 10% 1	492
	21st to end	Day	14% 11% 33% 27% 13% 3	500
May	1st to 10th	Day	15% 13% 30% 29% 12% 2	503
	11th to 20th	Day	13% 6% 27% 28% 21% 5%	571
	21st to end	Day	8% 6% 21% 35% 23% 6%	789
June	1st to 10th	Day	8% 4 17% 31% 29% 10%	730
	11th to 20th	Day	5% 3 14% 35% 32% 11%	730
	21st to end	Day	6% 1 13% 34% 31% 16%	730
July	1st to 10th	Day	6% 2 9% 29% 38% 17%	721
	11th to 20th	Day	7% 1 6% 31% 35% 19%	718
	21st to end	Day	6% 2 8% 26% 38% 21%	794
August	1st to 10th	Day	5% 1 9% 28% 42% 15%	655
	11th to 20th	Day	10% 2 8% 24% 40% 17%	519
	21st to end	Day	11% 2 7% 21% 34% 24%	583
September	1st to 10th	Day	11% 2 10% 26% 33% 18%	530
	11th to 20th	Day	12% 3 11% 21% 31% 23%	530
	21st to end	Day	14% 4 12% 29% 26% 14%	417
October	1st to 10th	Day	9% 1 25% 30% 27% 7%	330
	11th to 20th	Day	9% 5% 34% 32% 17% 3	330
	21st to end	Day	22% 8% 26% 29% 12% 2	363
November	1st to 10th	Day	21% 8% 25% 28% 16% 2	330
	11th to 20th	Day	14% 8% 38% 30% 9% 1	330
	21st to end	Day	20% 17% 30% 21% 10% 2	330
December	1st to 10th	Day	21% 18% 35% 18% 6% 2	330
	11th to 20th	Day	25% 12% 31% 21% 10% 2	330
	21st to end	Day	20% 19% 35% 21% 4 1	363
January	1st to 10th	Night	20% 11% 36% 28% 5%	1050
	11th to 20th	Night	20% 12% 39% 25% 5%	1031
	21st to end	Night	20% 10% 40% 27% 3	1100
February	1st to 10th	Night	23% 11% 36% 26% 5%	976
	11th to 20th	Night	24% 12% 36% 25% 3	783
	21st to end	Night	22% 17% 34% 24% 2	660
March	1st to 10th	Night	20% 11% 32% 30% 6%	610
	11th to 20th	Night	19% 12% 35% 29% 6% 1	600
	21st to end	Night	19% 10% 35% 30% 7%	660
April	1st to 10th	Night	14% 12% 37% 30% 8%	600
	11th to 20th	Night	13% 11% 36% 28% 10% 1	593
	21st to end	Night	13% 7% 37% 31% 12% 1	600
May	1st to 10th	Night	12% 7% 24% 44% 13% 1	600
	11th to 20th	Night	15% 5% 26% 35% 18% 2	591
	21st to end	Night	8% 2 24% 38% 24% 4	650
June	1st to 10th	Night	6% 2 12% 40% 36% 5%	600
	11th to 20th	Night	4 2 12% 38% 40% 4	600
	21st to end	Night	4 1 9% 36% 43% 7%	600
July	1st to 10th	Night	4 2 6% 33% 45% 11%	585
	11th to 20th	Night	4 1 5% 34% 47% 9%	582
	21st to end	Night	4 1 5% 34% 44% 11%	657
August	1st to 10th	Night	4 1 5% 34% 47% 9%	597
	11th to 20th	Night	7% 1 6% 32% 46% 9%	594
	21st to end	Night	9% 1 7% 28% 47% 8%	660
September	1st to 10th	Night	9% 1 10% 35% 40% 6%	600
	11th to 20th	Night	12% 2 10% 28% 39% 9%	600
	21st to end	Night	11% 3 12% 35% 35% 4	739
October	1st to 10th	Night	8% 2 14% 39% 32% 5%	800
	11th to 20th	Night	11% 5% 23% 40% 20% 2	800
	21st to end	Night	17% 7% 24% 33% 17% 2	880
November	1st to 10th	Night	13% 6% 27% 33% 20% 1	820
	11th to 20th	Night	11% 8% 33% 37% 12%	840
	21st to end	Night	15% 9% 34% 29% 12% 1	840
December	1st to 10th	Night	19% 11% 33% 30% 7%	971
	11th to 20th	Night	21% 10% 30% 32% 6%	1050
	21st to end	Night	22% 13% 32% 28% 6%	1155

Page generated at 2026-01-14 00:14:32. Version ac07

Copyright © 2026 Attilla Danko.