Canoe Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Canoe 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	15% 9% 3 8% 5% 5% 5% 4 6% 7% 33%	127379
	Night	15% 9% 4 9% 5% 5% 4 4 5% 7% 34%	124295
Transparency	Day	49% 5% 12% 21% 12% 2	130974
	Night	48% 5% 12% 21% 12% 2	128769
Seeing	Day	25% 14% 25% 20% 11% 4	16249
	Night	22% 12% 23% 30% 12% 1	25851

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	12% 14% 6% 20% 5% 4 4 3 4 4 23%	3790
	11th to 20th	Day	11% 16% 8% 17% 8% 7% 6% 4 4 4 16%	4114
	21st to end	Day	15% 18% 7% 10% 6% 5% 4 3 4 5% 24%	4466
February	1st to 10th	Day	15% 14% 5% 10% 6% 6% 5% 4 5% 6% 25%	1800
	11th to 20th	Day	14% 10% 5% 12% 5% 5% 5% 4 7% 7% 27%	1753
	21st to end	Day	16% 11% 4 13% 5% 5% 4 3 4 6% 28%	1630
March	1st to 10th	Day	17% 12% 4 8% 5% 4 4 3 4 5% 34%	4935
	11th to 20th	Day	12% 9% 4 8% 5% 5% 5% 3 5% 8% 36%	4980
	21st to end	Day	13% 9% 3 8% 5% 6% 4 3 5% 5% 37%	5465
April	1st to 10th	Day	16% 12% 3 8% 6% 5% 5% 3 5% 6% 31%	2393
	11th to 20th	Day	14% 10% 3 7% 5% 5% 5% 4 5% 6% 36%	2374
	21st to end	Day	20% 7% 3 7% 4 5% 4 4 4 7% 35%	2495
May	1st to 10th	Day	23% 7% 3 8% 5% 5% 5% 4 6% 7% 27%	5862
	11th to 20th	Day	25% 7% 2 6% 5% 4 5% 4 6% 7% 30%	6124
	21st to end	Day	17% 7% 3 7% 5% 5% 5% 5% 6% 8% 32%	6934
June	1st to 10th	Day	14% 6% 3 6% 5% 5% 6% 5% 6% 8% 36%	2800
	11th to 20th	Day	14% 6% 2 7% 5% 6% 5% 5% 7% 10% 34%	2800
	21st to end	Day	12% 5% 2 6% 5% 5% 5% 5% 6% 10% 39%	2800
July	1st to 10th	Day	6% 5% 3 8% 6% 6% 6% 4 6% 9% 41%	6360
	11th to 20th	Day	7% 6% 3 8% 7% 7% 7% 5% 8% 10% 31%	6144
	21st to end	Day	9% 7% 3 7% 5% 5% 5% 4 6% 8% 40%	6424
August	1st to 10th	Day	17% 6% 3 7% 5% 5% 6% 5% 7% 9% 30%	4234
	11th to 20th	Day	10% 6% 2 8% 6% 5% 6% 5% 6% 8% 36%	4151
	21st to end	Day	13% 5% 2 6% 4 4 4 4 7% 9% 42%	4312
September	1st to 10th	Day	16% 5% 2 6% 4 4 5% 2 5% 7% 45%	2400
	11th to 20th	Day	14% 5% 2 5% 4 4 4 3 6% 7% 47%	2352
	21st to end	Day	22% 7% 2 6% 4 3 6% 4 5% 7% 34%	2113
October	1st to 10th	Day	16% 7% 3 7% 4 4 4 4 4 7% 41%	2000
	11th to 20th	Day	16% 7% 2 8% 5% 5% 5% 4 6% 6% 38%	2000
	21st to end	Day	16% 8% 3 8% 5% 5% 4 3 5% 7% 37%	2200
November	1st to 10th	Day	10% 7% 3 6% 5% 4 4 4 6% 7% 45%	1974
	11th to 20th	Day	15% 10% 3 8% 5% 5% 5% 5% 5% 7% 33%	1722
	21st to end	Day	16% 11% 3 8% 7% 5% 5% 4 5% 7% 29%	1680
December	1st to 10th	Day	14% 10% 6% 15% 7% 6% 6% 4 6% 5% 23%	2680
	11th to 20th	Day	21% 13% 4 8% 4 4 4 4 4 5% 28%	3070
	21st to end	Day	19% 16% 6% 12% 7% 6% 4 3 4 6% 16%	4048
January	1st to 10th	Night	11% 11% 5% 21% 7% 5% 5% 3 5% 5% 21%	6371
	11th to 20th	Night	11% 14% 6% 16% 7% 5% 4 4 5% 6% 23%	5979
	21st to end	Night	17% 12% 5% 11% 6% 5% 4 3 6% 6% 25%	6490
February	1st to 10th	Night	15% 10% 4 9% 6% 5% 5% 4 5% 6% 31%	2600
	11th to 20th	Night	15% 10% 3 9% 6% 5% 6% 5% 6% 7% 29%	2533
	21st to end	Night	15% 10% 4 10% 6% 5% 5% 5% 5% 6% 30%	1996
March	1st to 10th	Night	17% 10% 5% 8% 6% 4 4 3 5% 6% 33%	4918
	11th to 20th	Night	10% 8% 4 6% 4 4 4 3 5% 7% 45%	4980
	21st to end	Night	12% 8% 3 8% 5% 5% 5% 4 5% 6% 39%	5467
April	1st to 10th	Night	17% 11% 4 7% 5% 5% 5% 3 5% 5% 32%	2005
	11th to 20th	Night	14% 8% 2 7% 5% 4 4 4 5% 8% 39%	1975
	21st to end	Night	17% 7% 2 6% 5% 4 5% 4 5% 7% 39%	1920
May	1st to 10th	Night	25% 8% 3 8% 4 4 5% 4 6% 7% 26%	4033
	11th to 20th	Night	27% 8% 1 5% 4 3 4 3 5% 8% 32%	3765
	21st to end	Night	20% 7% 3 5% 4 4 4 4 6% 9% 34%	3920
June	1st to 10th	Night	12% 6% 2 6% 4 5% 5% 4 5% 8% 44%	1600
	11th to 20th	Night	12% 6% 1 6% 5% 5% 5% 5% 6% 10% 40%	1600
	21st to end	Night	10% 4 2 5% 3 4 6% 4 6% 11% 45%	1600
July	1st to 10th	Night	8% 6% 2 8% 5% 5% 5% 5% 6% 10% 41%	3598
	11th to 20th	Night	6% 6% 3 9% 7% 7% 6% 5% 8% 10% 34%	3795
	21st to end	Night	8% 5% 2 7% 5% 5% 5% 4 6% 8% 44%	4427
August	1st to 10th	Night	16% 6% 2 6% 4 4 4 4 6% 9% 38%	2915
	11th to 20th	Night	12% 7% 2 6% 4 4 5% 4 7% 7% 42%	2875
	21st to end	Night	14% 4 2 5% 3 4 4 4 5% 8% 47%	3574
September	1st to 10th	Night	15% 5% 2 5% 4 3 5% 3 5% 5% 47%	2000
	11th to 20th	Night	11% 5% 1 5% 3 3 3 3 5% 9% 51%	2044
	21st to end	Night	20% 6% 2 6% 4 4 4 3 5% 7% 40%	2286
October	1st to 10th	Night	16% 7% 2 5% 3 3 4 3 5% 6% 47%	2400
	11th to 20th	Night	17% 6% 2 5% 4 5% 4 2 4 7% 43%	2400
	21st to end	Night	18% 8% 2 5% 4 3 4 3 5% 7% 40%	2640
November	1st to 10th	Night	10% 6% 2 6% 5% 4 3 3 5% 6% 49%	2541
	11th to 20th	Night	15% 10% 3 7% 5% 4 4 4 6% 7% 35%	2893
	21st to end	Night	16% 9% 4 8% 5% 5% 4 4 4 6% 34%	2940
December	1st to 10th	Night	12% 9% 7% 13% 6% 5% 5% 4 6% 7% 27%	4720
	11th to 20th	Night	19% 12% 4 9% 6% 5% 4 4 5% 6% 28%	5345
	21st to end	Night	19% 14% 5% 11% 6% 5% 5% 3 5% 5% 21%	7150

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	65% 3 11% 15% 5% 1	3791
	11th to 20th	Day	70% 3 9% 9% 7% 2	4114
	21st to end	Day	64% 2 11% 15% 8%	4466
February	1st to 10th	Day	60% 3 13% 16% 7% 1	1800
	11th to 20th	Day	56% 5% 11% 20% 7% 1	1762
	21st to end	Day	57% 3 11% 18% 8% 3	1630
March	1st to 10th	Day	52% 4 11% 21% 10% 3	4935
	11th to 20th	Day	47% 4 13% 26% 9% 2	4980
	21st to end	Day	49% 3 11% 21% 14% 2	5465
April	1st to 10th	Day	54% 5% 10% 18% 12% 2	2393
	11th to 20th	Day	49% 5% 9% 18% 16% 2	2374
	21st to end	Day	49% 4 9% 22% 13% 2	2495
May	1st to 10th	Day	55% 5% 11% 17% 10% 2	5897
	11th to 20th	Day	53% 5% 10% 21% 10% 1	6128
	21st to end	Day	47% 6% 13% 21% 12% 1	6949
June	1st to 10th	Day	44% 6% 11% 23% 15% 1	2800
	11th to 20th	Day	45% 6% 13% 21% 14% 1	2800
	21st to end	Day	39% 6% 14% 26% 14% 1	2800
July	1st to 10th	Day	40% 7% 11% 26% 14% 2	6290
	11th to 20th	Day	42% 9% 15% 21% 12%	6069
	21st to end	Day	40% 6% 9% 24% 20% 1	6240
August	1st to 10th	Day	48% 7% 14% 21% 10%	4221
	11th to 20th	Day	44% 6% 11% 27% 11% 1	4190
	21st to end	Day	37% 5% 12% 29% 15% 2	4312
September	1st to 10th	Day	40% 6% 9% 23% 18% 4	2400
	11th to 20th	Day	36% 4 10% 28% 20% 2	2352
	21st to end	Day	49% 6% 10% 18% 16% 1	2113
October	1st to 10th	Day	38% 4 8% 27% 20% 3	3260
	11th to 20th	Day	41% 4 10% 24% 16% 5%	3240
	21st to end	Day	32% 3 14% 29% 21% 1	3538
November	1st to 10th	Day	39% 4 15% 21% 17% 4	1974
	11th to 20th	Day	50% 5% 11% 20% 12% 2	1722
	21st to end	Day	55% 3 13% 21% 8%	1680
December	1st to 10th	Day	59% 7% 14% 14% 5% 1	2680
	11th to 20th	Day	59% 3 13% 21% 5%	3066
	21st to end	Day	69% 3 12% 9% 6%	4048
January	1st to 10th	Night	64% 4 10% 15% 7% 1	6371
	11th to 20th	Night	60% 5% 12% 13% 7% 3	5979
	21st to end	Night	58% 4 11% 17% 8% 1	6490
February	1st to 10th	Night	54% 4 12% 22% 8% 1	2600
	11th to 20th	Night	53% 4 11% 19% 11% 1	2535
	21st to end	Night	54% 5% 10% 19% 10% 2	1996
March	1st to 10th	Night	52% 4 12% 21% 10% 1	4918
	11th to 20th	Night	38% 4 16% 29% 9% 4	4980
	21st to end	Night	45% 4 12% 19% 18% 2	5467
April	1st to 10th	Night	54% 5% 10% 17% 14% 1	2005
	11th to 20th	Night	43% 5% 11% 22% 16% 3	1975
	21st to end	Night	44% 5% 10% 25% 14% 3	1920
May	1st to 10th	Night	57% 5% 10% 15% 10% 3	4060
	11th to 20th	Night	51% 5% 12% 23% 8% 1	3766
	21st to end	Night	47% 6% 13% 22% 10% 3	3927
June	1st to 10th	Night	39% 6% 13% 26% 15% 2	1600
	11th to 20th	Night	39% 7% 14% 24% 13% 2	1600
	21st to end	Night	33% 6% 17% 26% 16% 1	1600
July	1st to 10th	Night	38% 8% 14% 24% 14% 2	3560
	11th to 20th	Night	42% 9% 17% 19% 12% 1	3750
	21st to end	Night	36% 7% 12% 22% 22% 1	4297
August	1st to 10th	Night	43% 7% 17% 24% 10%	2904
	11th to 20th	Night	38% 7% 13% 28% 13% 1	2902
	21st to end	Night	35% 5% 13% 31% 13% 2	3574
September	1st to 10th	Night	39% 4 11% 24% 19% 3	2000
	11th to 20th	Night	31% 5% 11% 32% 20% 2	2044
	21st to end	Night	45% 5% 11% 22% 17% 1	2286
October	1st to 10th	Night	35% 5% 11% 26% 22% 1	3920
	11th to 20th	Night	33% 5% 10% 26% 21% 5%	3899
	21st to end	Night	32% 3 12% 29% 22% 2	4252
November	1st to 10th	Night	37% 4 13% 25% 19% 3	2541
	11th to 20th	Night	48% 5% 9% 22% 13% 3	2893
	21st to end	Night	51% 4 13% 22% 9% 1	2940
December	1st to 10th	Night	55% 6% 16% 19% 5%	4720
	11th to 20th	Night	57% 4 14% 18% 6%	5348
	21st to end	Night	64% 4 11% 13% 7%	7150

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	37% 23% 27% 11% 2	246
	11th to 20th	Day	44% 16% 30% 8% 1 1	318
	21st to end	Day	29% 28% 27% 13% 2 1	330
February	1st to 10th	Day	33% 26% 25% 12% 3	300
	11th to 20th	Day	43% 26% 25% 7%	300
	21st to end	Day	35% 22% 27% 14% 1	379
March	1st to 10th	Day	34% 17% 26% 19% 4	500
	11th to 20th	Day	33% 21% 25% 15% 5% 1	500
	21st to end	Day	31% 21% 27% 14% 4 2	550
April	1st to 10th	Day	35% 18% 25% 16% 5% 1	500
	11th to 20th	Day	29% 18% 23% 18% 9% 3	492
	21st to end	Day	33% 17% 27% 12% 10% 1	500
May	1st to 10th	Day	32% 14% 26% 17% 9% 3	503
	11th to 20th	Day	28% 14% 28% 14% 11% 4	527
	21st to end	Day	22% 13% 25% 21% 13% 6%	573
June	1st to 10th	Day	21% 15% 25% 22% 13% 4	530
	11th to 20th	Day	21% 11% 26% 26% 13% 3	530
	21st to end	Day	16% 12% 26% 27% 15% 3	530
July	1st to 10th	Day	12% 7% 26% 27% 19% 9%	525
	11th to 20th	Day	8% 8% 27% 28% 19% 8%	524
	21st to end	Day	14% 6% 27% 29% 17% 6%	576
August	1st to 10th	Day	13% 8% 23% 27% 19% 10%	526
	11th to 20th	Day	16% 6% 22% 26% 20% 10%	519
	21st to end	Day	16% 7% 25% 24% 16% 13%	583
September	1st to 10th	Day	19% 8% 17% 28% 18% 10%	530
	11th to 20th	Day	17% 4 18% 28% 24% 10%	530
	21st to end	Day	33% 10% 20% 18% 14% 5%	530
October	1st to 10th	Day	23% 9% 19% 25% 17% 7%	530
	11th to 20th	Day	24% 14% 28% 21% 11% 2	530
	21st to end	Day	22% 19% 28% 21% 9% 1	583
November	1st to 10th	Day	22% 15% 25% 24% 12% 2	491
	11th to 20th	Day	30% 19% 26% 19% 6%	262
	21st to end	Day	35% 20% 29% 13% 3 1	220
December	1st to 10th	Day	33% 25% 27% 8% 6% 1	220
	11th to 20th	Day	36% 18% 27% 17% 2	220
	21st to end	Day	37% 16% 26% 14% 7%	242
January	1st to 10th	Night	26% 20% 31% 19% 4	840
	11th to 20th	Night	30% 16% 29% 22% 3	825
	21st to end	Night	23% 21% 30% 24% 2	880
February	1st to 10th	Night	27% 16% 27% 27% 2	800
	11th to 20th	Night	29% 21% 31% 18% 1	783
	21st to end	Night	28% 15% 31% 24% 2	660
March	1st to 10th	Night	24% 18% 29% 24% 4	800
	11th to 20th	Night	28% 18% 25% 23% 6%	800
	21st to end	Night	24% 16% 32% 22% 6%	880
April	1st to 10th	Night	27% 19% 27% 23% 4	800
	11th to 20th	Night	22% 15% 25% 29% 8% 1	791
	21st to end	Night	23% 11% 26% 33% 7%	720
May	1st to 10th	Night	23% 10% 21% 34% 12% 1	600
	11th to 20th	Night	23% 8% 23% 36% 11%	480
	21st to end	Night	15% 8% 19% 35% 21% 2	433
June	1st to 10th	Night	14% 6% 23% 38% 19%	400
	11th to 20th	Night	17% 5% 21% 38% 18% 1	400
	21st to end	Night	12% 5% 23% 42% 19% 1	400
July	1st to 10th	Night	12% 2 17% 42% 25% 3	390
	11th to 20th	Night	7% 3 16% 39% 33% 2	469
	21st to end	Night	9% 2 17% 44% 27% 2	657
August	1st to 10th	Night	10% 2 13% 43% 31% 2	597
	11th to 20th	Night	14% 3 12% 38% 28% 4	594
	21st to end	Night	15% 3 15% 35% 29% 3	868
September	1st to 10th	Night	16% 4 17% 31% 29% 3	800
	11th to 20th	Night	14% 5% 13% 33% 32% 4	800
	21st to end	Night	23% 7% 16% 31% 19% 3	800
October	1st to 10th	Night	18% 7% 20% 30% 22% 4	800
	11th to 20th	Night	22% 11% 23% 31% 13% 1	800
	21st to end	Night	25% 13% 23% 31% 8%	880
November	1st to 10th	Night	16% 11% 25% 36% 10%	820
	11th to 20th	Night	28% 15% 22% 27% 8% 1	840
	21st to end	Night	27% 16% 25% 26% 5% 1	840
December	1st to 10th	Night	28% 16% 28% 22% 6%	840
	11th to 20th	Night	27% 15% 26% 28% 3	840
	21st to end	Night	25% 17% 24% 31% 3	924

Page generated at 2026-01-14 01:14:25. Version ac07

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