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 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	15% 8% 4 7% 6% 4 5% 5% 6% 7% 34%	74665
	Night	15% 8% 3 6% 6% 3 5% 5% 5% 7% 37%	75085
Transparency	Day	50% 5% 12% 20% 12% 2	74375
	Night	46% 5% 12% 22% 12% 2	74894
Seeing	Day	25% 14% 25% 20% 11% 4	13643
	Night	21% 12% 23% 30% 12% 1	23274

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% 10% 5% 10% 9% 4 6% 6% 5% 6% 29%	1559
	11th to 20th	Day	15% 15% 5% 11% 7% 4 6% 5% 5% 6% 22%	1647
	21st to end	Day	13% 16% 5% 10% 8% 5% 6% 5% 5% 4 24%	1782
February	1st to 10th	Day	16% 13% 6% 9% 7% 5% 5% 5% 5% 6% 24%	1620
	11th to 20th	Day	14% 9% 6% 11% 7% 4 5% 5% 6% 8% 26%	1573
	21st to end	Day	17% 11% 4 11% 7% 3 5% 4 4 6% 29%	1461
March	1st to 10th	Day	14% 8% 4 8% 5% 5% 5% 4 4 6% 36%	1980
	11th to 20th	Day	18% 9% 4 7% 6% 4 5% 4 5% 7% 30%	1980
	21st to end	Day	19% 9% 4 7% 6% 4 4 3 5% 6% 33%	2178
April	1st to 10th	Day	14% 10% 5% 8% 7% 3 6% 5% 5% 7% 33%	2153
	11th to 20th	Day	15% 9% 4 5% 7% 4 5% 6% 5% 6% 36%	2134
	21st to end	Day	22% 7% 3 7% 5% 3 5% 4 4 6% 34%	2245
May	1st to 10th	Day	19% 7% 3 7% 6% 3 5% 6% 6% 7% 30%	2340
	11th to 20th	Day	22% 6% 3 5% 5% 4 6% 5% 5% 6% 33%	2396
	21st to end	Day	14% 6% 3 5% 6% 4 5% 5% 6% 8% 38%	2725
June	1st to 10th	Day	14% 6% 3 6% 5% 4 7% 5% 6% 8% 36%	2520
	11th to 20th	Day	13% 6% 3 6% 6% 4 6% 6% 7% 10% 34%	2520
	21st to end	Day	12% 5% 2 5% 6% 4 6% 6% 6% 10% 38%	2520
July	1st to 10th	Day	10% 6% 3 6% 6% 4 6% 6% 6% 7% 39%	2520
	11th to 20th	Day	8% 5% 2 6% 7% 4 6% 6% 8% 9% 40%	2444
	21st to end	Day	10% 6% 4 6% 7% 4 6% 6% 7% 9% 35%	2547
August	1st to 10th	Day	10% 6% 3 6% 7% 5% 7% 8% 8% 10% 32%	2327
	11th to 20th	Day	12% 6% 2 7% 6% 3 6% 6% 6% 9% 36%	2295
	21st to end	Day	13% 6% 2 6% 5% 4 5% 5% 8% 9% 36%	2376
September	1st to 10th	Day	17% 5% 2 5% 5% 3 6% 3 4 7% 42%	2160
	11th to 20th	Day	14% 5% 2 4 5% 3 3 4 6% 7% 46%	2118
	21st to end	Day	18% 6% 2 6% 5% 2 5% 6% 5% 7% 37%	1903
October	1st to 10th	Day	17% 7% 3 6% 6% 3 4 5% 4 7% 38%	1800
	11th to 20th	Day	17% 7% 3 7% 6% 3 5% 5% 6% 5% 37%	1800
	21st to end	Day	17% 8% 3 7% 6% 3 5% 4 5% 6% 36%	1980
November	1st to 10th	Day	10% 7% 4 6% 5% 3 4 4 5% 7% 44%	1782
	11th to 20th	Day	15% 7% 3 7% 6% 4 6% 6% 5% 7% 34%	1558
	21st to end	Day	16% 9% 3 7% 8% 4 5% 5% 6% 7% 30%	1520
December	1st to 10th	Day	17% 12% 6% 8% 7% 4 6% 5% 5% 6% 24%	1520
	11th to 20th	Day	17% 12% 6% 8% 5% 3 5% 4 4 7% 29%	1910
	21st to end	Day	21% 16% 5% 9% 8% 4 5% 4 4 6% 17%	2772
January	1st to 10th	Night	13% 10% 4 9% 8% 4 6% 4 6% 7% 30%	2602
	11th to 20th	Night	16% 12% 5% 8% 7% 4 6% 5% 5% 6% 25%	2386
	21st to end	Night	13% 11% 4 10% 8% 4 5% 5% 6% 7% 28%	2574
February	1st to 10th	Night	15% 9% 5% 8% 7% 3 5% 5% 5% 7% 30%	2340
	11th to 20th	Night	14% 9% 4 7% 7% 4 6% 6% 7% 7% 29%	2273
	21st to end	Night	16% 10% 5% 9% 7% 3 5% 5% 5% 6% 30%	1791
March	1st to 10th	Night	12% 8% 4 4 6% 3 4 5% 6% 9% 39%	1980
	11th to 20th	Night	17% 8% 4 7% 5% 3 4 4 5% 5% 39%	1980
	21st to end	Night	17% 8% 3 6% 6% 4 4 5% 4 6% 38%	2178
April	1st to 10th	Night	16% 10% 5% 7% 5% 3 6% 5% 5% 5% 33%	1805
	11th to 20th	Night	13% 7% 2 6% 6% 4 4 5% 5% 8% 40%	1775
	21st to end	Night	18% 6% 2 6% 5% 3 5% 5% 5% 7% 38%	1728
May	1st to 10th	Night	17% 7% 3 6% 6% 3 5% 5% 6% 8% 34%	1620
	11th to 20th	Night	19% 6% 2 4 5% 3 5% 4 5% 8% 38%	1493
	21st to end	Night	12% 7% 3 4 4 3 4 5% 7% 10% 42%	1550
June	1st to 10th	Night	12% 5% 3 5% 4 4 5% 5% 5% 9% 45%	1440
	11th to 20th	Night	11% 5% 2 6% 5% 4 5% 6% 7% 10% 39%	1440
	21st to end	Night	10% 4 2 4 4 3 5% 5% 6% 11% 47%	1440
July	1st to 10th	Night	10% 4 3 5% 4 3 5% 5% 5% 10% 45%	1440
	11th to 20th	Night	6% 4 2 5% 5% 3 4 4 6% 10% 51%	1512
	21st to end	Night	8% 4 3 6% 5% 4 5% 6% 9% 10% 41%	1771
August	1st to 10th	Night	7% 5% 3 5% 6% 3 6% 4 6% 11% 46%	1611
	11th to 20th	Night	10% 6% 2 5% 5% 3 5% 4 6% 7% 46%	1598
	21st to end	Night	12% 5% 2 5% 4 3 5% 5% 6% 9% 45%	1968
September	1st to 10th	Night	16% 4 2 5% 5% 3 4 4 5% 5% 46%	1800
	11th to 20th	Night	12% 5% 1 4 3 2 3 4 5% 9% 52%	1839
	21st to end	Night	17% 5% 2 5% 4 3 3 4 5% 7% 44%	2056
October	1st to 10th	Night	16% 7% 2 5% 4 3 4 4 5% 6% 44%	2160
	11th to 20th	Night	18% 6% 2 5% 5% 3 4 4 4 8% 42%	2160
	21st to end	Night	20% 8% 3 5% 4 3 4 4 5% 6% 39%	2376
November	1st to 10th	Night	10% 6% 3 6% 5% 3 4 4 5% 6% 49%	2293
	11th to 20th	Night	14% 9% 3 6% 6% 3 5% 4 6% 7% 36%	2617
	21st to end	Night	16% 8% 4 7% 5% 3 5% 5% 5% 7% 36%	2660
December	1st to 10th	Night	18% 10% 5% 8% 6% 4 5% 5% 6% 8% 26%	2660
	11th to 20th	Night	16% 10% 4 7% 7% 3 5% 6% 6% 6% 30%	3285
	21st to end	Night	19% 13% 5% 9% 8% 4 5% 5% 5% 7% 21%	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	55% 4 13% 19% 7% 1	1560
	11th to 20th	Day	63% 4 12% 14% 6% 1	1647
	21st to end	Day	64% 4 10% 14% 7% 1	1782
February	1st to 10th	Day	62% 3 14% 15% 6% 1	1620
	11th to 20th	Day	57% 5% 11% 19% 7% 1	1582
	21st to end	Day	58% 3 10% 17% 8% 3	1461
March	1st to 10th	Day	50% 4 13% 22% 10% 1	1980
	11th to 20th	Day	55% 4 11% 19% 10% 3	1980
	21st to end	Day	54% 3 10% 20% 11% 2	2178
April	1st to 10th	Day	51% 5% 10% 19% 13% 2	2153
	11th to 20th	Day	49% 5% 9% 17% 16% 3	2134
	21st to end	Day	51% 4 9% 21% 12% 3	2245
May	1st to 10th	Day	52% 5% 10% 19% 12% 2	2340
	11th to 20th	Day	51% 5% 12% 16% 14% 3	2400
	21st to end	Day	44% 6% 16% 21% 11% 2	2725
June	1st to 10th	Day	45% 6% 12% 22% 14% 1	2520
	11th to 20th	Day	46% 6% 13% 20% 13% 1	2520
	21st to end	Day	40% 6% 14% 26% 13% 1	2520
July	1st to 10th	Day	44% 7% 11% 20% 14% 3	2450
	11th to 20th	Day	38% 6% 15% 24% 17% 1	2369
	21st to end	Day	44% 6% 11% 21% 16% 2	2405
August	1st to 10th	Day	43% 7% 15% 23% 11%	2314
	11th to 20th	Day	44% 7% 11% 24% 12% 1	2295
	21st to end	Day	42% 6% 13% 23% 13% 3	2376
September	1st to 10th	Day	43% 6% 10% 21% 16% 4	2160
	11th to 20th	Day	37% 5% 10% 28% 19% 2	2118
	21st to end	Day	46% 6% 11% 20% 17% 2	1903
October	1st to 10th	Day	47% 5% 10% 21% 15% 2	1800
	11th to 20th	Day	48% 4 11% 26% 12%	1800
	21st to end	Day	49% 4 12% 21% 13% 1	1980
November	1st to 10th	Day	40% 4 15% 21% 16% 4	1782
	11th to 20th	Day	49% 5% 11% 21% 11% 2	1558
	21st to end	Day	53% 3 13% 22% 8%	1520
December	1st to 10th	Day	61% 5% 14% 14% 5%	1520
	11th to 20th	Day	57% 3 12% 23% 5%	1906
	21st to end	Day	70% 2 12% 11% 5%	2772
January	1st to 10th	Night	54% 3 11% 21% 9% 1	2602
	11th to 20th	Night	59% 5% 13% 16% 6% 1	2386
	21st to end	Night	56% 4 11% 18% 9% 2	2574
February	1st to 10th	Night	54% 5% 12% 21% 8% 1	2340
	11th to 20th	Night	53% 4 11% 19% 12% 1	2275
	21st to end	Night	55% 5% 9% 19% 10% 2	1791
March	1st to 10th	Night	41% 5% 13% 26% 14% 1	1980
	11th to 20th	Night	48% 4 11% 22% 13% 2	1980
	21st to end	Night	48% 4 11% 20% 15% 3	2178
April	1st to 10th	Night	52% 5% 10% 17% 14% 1	1805
	11th to 20th	Night	43% 5% 11% 23% 16% 3	1775
	21st to end	Night	45% 5% 10% 24% 14% 3	1728
May	1st to 10th	Night	48% 6% 9% 21% 12% 4	1620
	11th to 20th	Night	46% 6% 12% 19% 15% 2	1494
	21st to end	Night	37% 7% 16% 26% 12% 2	1551
June	1st to 10th	Night	38% 6% 13% 28% 15% 2	1440
	11th to 20th	Night	39% 8% 14% 24% 13% 2	1440
	21st to end	Night	33% 6% 17% 28% 16% 1	1440
July	1st to 10th	Night	36% 8% 13% 24% 15% 3	1400
	11th to 20th	Night	30% 6% 17% 26% 19% 2	1464
	21st to end	Night	34% 9% 17% 22% 16% 3	1672
August	1st to 10th	Night	33% 7% 19% 27% 14%	1600
	11th to 20th	Night	35% 6% 17% 24% 16% 1	1598
	21st to end	Night	36% 5% 14% 26% 15% 3	1968
September	1st to 10th	Night	41% 4 12% 23% 18% 3	1800
	11th to 20th	Night	32% 5% 10% 31% 20% 2	1839
	21st to end	Night	41% 5% 11% 23% 18% 2	2056
October	1st to 10th	Night	41% 6% 13% 25% 15% 1	2160
	11th to 20th	Night	42% 4 11% 27% 14% 1	2160
	21st to end	Night	46% 4 9% 25% 14% 1	2376
November	1st to 10th	Night	38% 4 12% 25% 18% 4	2293
	11th to 20th	Night	47% 5% 9% 23% 13% 3	2617
	21st to end	Night	49% 4 13% 22% 10% 2	2660
December	1st to 10th	Night	57% 5% 14% 17% 7%	2660
	11th to 20th	Night	54% 5% 11% 22% 8%	3288
	21st to end	Night	63% 4 14% 14% 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	34% 25% 28% 11% 3 1	200
	11th to 20th	Day	41% 17% 31% 10% 1 1	249
	21st to end	Day	31% 28% 28% 11% 2 1	264
February	1st to 10th	Day	35% 28% 25% 10% 3	240
	11th to 20th	Day	40% 27% 27% 6%	240
	21st to end	Day	38% 23% 25% 15% 1	314
March	1st to 10th	Day	33% 17% 26% 20% 4	420
	11th to 20th	Day	32% 21% 25% 16% 5% 2	420
	21st to end	Day	32% 19% 26% 15% 5% 2	462
April	1st to 10th	Day	32% 19% 25% 18% 5% 2	420
	11th to 20th	Day	27% 17% 23% 19% 11% 3	412
	21st to end	Day	34% 18% 26% 12% 9% 1	420
May	1st to 10th	Day	32% 14% 26% 16% 9% 4	423
	11th to 20th	Day	28% 13% 30% 15% 11% 4	447
	21st to end	Day	20% 13% 24% 21% 14% 7%	485
June	1st to 10th	Day	20% 14% 26% 23% 13% 4	450
	11th to 20th	Day	20% 12% 25% 27% 14% 3	450
	21st to end	Day	16% 12% 27% 27% 14% 3	450
July	1st to 10th	Day	13% 7% 24% 26% 19% 10%	445
	11th to 20th	Day	7% 8% 28% 29% 19% 9%	444
	21st to end	Day	14% 6% 28% 29% 17% 6%	488
August	1st to 10th	Day	11% 9% 23% 26% 20% 11%	446
	11th to 20th	Day	15% 6% 22% 26% 20% 11%	439
	21st to end	Day	16% 7% 25% 24% 15% 12%	495
September	1st to 10th	Day	21% 7% 17% 26% 18% 11%	450
	11th to 20th	Day	18% 4 18% 28% 22% 9%	450
	21st to end	Day	27% 12% 21% 19% 15% 6%	450
October	1st to 10th	Day	24% 10% 18% 25% 18% 6%	450
	11th to 20th	Day	25% 13% 27% 22% 12% 1	450
	21st to end	Day	24% 18% 28% 20% 9%	495
November	1st to 10th	Day	22% 13% 24% 24% 14% 2	419
	11th to 20th	Day	28% 21% 25% 20% 6%	218
	21st to end	Day	29% 23% 29% 14% 3 1	180
December	1st to 10th	Day	32% 23% 28% 9% 7% 1	180
	11th to 20th	Day	36% 17% 27% 18% 2 1	180
	21st to end	Day	36% 16% 25% 15% 8%	198
January	1st to 10th	Night	25% 20% 31% 20% 4	760
	11th to 20th	Night	30% 14% 29% 23% 3	735
	21st to end	Night	23% 20% 30% 25% 2	792
February	1st to 10th	Night	28% 16% 27% 27% 3	720
	11th to 20th	Night	27% 22% 32% 18% 1	703
	21st to end	Night	28% 16% 30% 23% 2	592
March	1st to 10th	Night	23% 19% 30% 25% 4	720
	11th to 20th	Night	29% 17% 25% 22% 7%	720
	21st to end	Night	24% 16% 30% 23% 7% 1	792
April	1st to 10th	Night	26% 19% 28% 22% 5%	720
	11th to 20th	Night	21% 15% 25% 30% 8% 1	711
	21st to end	Night	24% 11% 26% 32% 7%	648
May	1st to 10th	Night	21% 10% 22% 33% 12% 1	540
	11th to 20th	Night	22% 8% 23% 36% 11%	432
	21st to end	Night	14% 8% 18% 36% 22% 3	389
June	1st to 10th	Night	14% 6% 23% 38% 19%	360
	11th to 20th	Night	16% 6% 23% 35% 20% 1	360
	21st to end	Night	11% 5% 22% 44% 17% 1	360
July	1st to 10th	Night	11% 2 17% 43% 24% 3	350
	11th to 20th	Night	7% 3 16% 39% 33% 2	420
	21st to end	Night	9% 2 18% 42% 26% 2	591
August	1st to 10th	Night	8% 2 14% 43% 31% 1	537
	11th to 20th	Night	14% 4 13% 37% 29% 4	534
	21st to end	Night	15% 3 14% 36% 29% 3	780
September	1st to 10th	Night	17% 3 15% 32% 29% 3	720
	11th to 20th	Night	15% 5% 14% 30% 31% 5%	720
	21st to end	Night	19% 8% 18% 31% 21% 4	720
October	1st to 10th	Night	19% 7% 20% 30% 21% 3	720
	11th to 20th	Night	22% 11% 23% 30% 13% 1	720
	21st to end	Night	27% 14% 22% 29% 8% 1	792
November	1st to 10th	Night	15% 11% 25% 36% 11% 1	740
	11th to 20th	Night	26% 15% 21% 28% 8% 1	760
	21st to end	Night	25% 16% 25% 28% 6% 1	760
December	1st to 10th	Night	29% 16% 27% 21% 6%	760
	11th to 20th	Night	26% 16% 26% 28% 4	760
	21st to end	Night	24% 17% 25% 31% 3	836

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