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 2024-11-25.

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% 34%	101435
	Night	15% 9% 3 8% 5% 4 4 4 5% 7% 35%	97982
Transparency	Day	48% 5% 12% 22% 12% 2	105074
	Night	47% 5% 12% 22% 13% 2	102482
Seeing	Day	24% 14% 25% 21% 11% 4	14837
	Night	21% 12% 23% 30% 12% 1	24360

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	15% 13% 6% 11% 6% 5% 5% 3 5% 5% 27%	2585
	11th to 20th	Day	11% 18% 8% 15% 6% 5% 5% 3 4 4 20%	2840
	21st to end	Day	18% 20% 7% 11% 7% 5% 4 3 4 4 18%	3124
February	1st to 10th	Day	15% 14% 5% 10% 7% 6% 4 4 5% 6% 26%	1710
	11th to 20th	Day	13% 10% 5% 13% 5% 5% 5% 4 7% 7% 27%	1663
	21st to end	Day	16% 11% 4 12% 5% 5% 4 3 4 6% 29%	1550
March	1st to 10th	Day	21% 11% 4 8% 5% 5% 5% 3 5% 6% 28%	3435
	11th to 20th	Day	12% 9% 4 8% 5% 5% 5% 4 5% 7% 35%	3480
	21st to end	Day	15% 9% 3 7% 5% 5% 4 3 5% 6% 39%	3815
April	1st to 10th	Day	14% 12% 3 8% 6% 5% 5% 3 5% 6% 32%	2273
	11th to 20th	Day	14% 10% 4 7% 6% 5% 5% 4 5% 5% 36%	2254
	21st to end	Day	21% 7% 3 7% 4 5% 4 4 4 6% 34%	2370
May	1st to 10th	Day	27% 7% 2 7% 5% 4 4 4 5% 6% 28%	4082
	11th to 20th	Day	24% 8% 3 7% 5% 4 5% 4 5% 6% 30%	4260
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 4 6% 9% 39%	4823
June	1st to 10th	Day	14% 6% 3 6% 5% 5% 6% 4 6% 8% 36%	2660
	11th to 20th	Day	12% 6% 2 6% 5% 6% 5% 5% 7% 10% 35%	2660
	21st to end	Day	12% 5% 2 6% 5% 5% 5% 5% 6% 10% 38%	2660
July	1st to 10th	Day	7% 6% 2 7% 6% 6% 6% 5% 7% 9% 40%	4440
	11th to 20th	Day	7% 6% 2 7% 6% 5% 7% 5% 7% 10% 39%	4294
	21st to end	Day	10% 8% 3 8% 5% 5% 5% 4 6% 7% 37%	4466
August	1st to 10th	Day	18% 6% 3 7% 5% 5% 6% 5% 7% 9% 30%	4104
	11th to 20th	Day	10% 7% 2 8% 6% 5% 7% 5% 6% 8% 36%	4022
	21st to end	Day	13% 5% 2 6% 4 5% 4 4 7% 9% 42%	4180
September	1st to 10th	Day	16% 6% 2 6% 4 4 5% 2 5% 7% 44%	2280
	11th to 20th	Day	14% 6% 2 5% 4 4 4 3 6% 7% 46%	2235
	21st to end	Day	21% 6% 2 6% 4 3 6% 4 5% 7% 35%	2008
October	1st to 10th	Day	17% 7% 3 7% 4 5% 4 4 4 7% 39%	1900
	11th to 20th	Day	16% 7% 2 8% 5% 5% 5% 4 6% 5% 38%	1900
	21st to end	Day	16% 8% 3 8% 4 5% 4 3 5% 6% 38%	2090
November	1st to 10th	Day	10% 7% 3 6% 5% 4 4 3 6% 7% 45%	1878
	11th to 20th	Day	15% 9% 2 8% 5% 5% 5% 5% 5% 7% 34%	1640
	21st to end	Day	16% 10% 3 8% 7% 4 5% 4 6% 6% 30%	1552
December	1st to 10th	Day	17% 12% 5% 9% 6% 6% 5% 4 6% 6% 24%	1520
	11th to 20th	Day	17% 13% 5% 9% 4 5% 4 4 4 7% 28%	1910
	21st to end	Day	21% 17% 5% 11% 7% 6% 4 3 4 6% 17%	2772
January	1st to 10th	Night	13% 12% 5% 12% 7% 6% 5% 4 6% 6% 26%	4356
	11th to 20th	Night	14% 15% 7% 12% 6% 5% 4 3 4 5% 23%	4120
	21st to end	Night	23% 14% 6% 12% 6% 4 3 3 4 4 22%	4532
February	1st to 10th	Night	15% 10% 4 9% 6% 5% 5% 4 5% 6% 31%	2470
	11th to 20th	Night	14% 10% 3 8% 6% 5% 6% 5% 6% 7% 29%	2403
	21st to end	Night	16% 11% 4 9% 6% 5% 5% 5% 5% 6% 30%	1900
March	1st to 10th	Night	21% 11% 4 6% 5% 3 3 3 5% 6% 32%	3418
	11th to 20th	Night	11% 9% 5% 7% 4 4 4 4 6% 7% 39%	3480
	21st to end	Night	14% 8% 2 6% 5% 4 4 3 4 6% 43%	3817
April	1st to 10th	Night	16% 11% 4 7% 5% 5% 6% 3 6% 5% 32%	1905
	11th to 20th	Night	14% 7% 2 7% 5% 4 4 4 5% 8% 39%	1875
	21st to end	Night	17% 6% 2 6% 5% 4 5% 4 5% 7% 39%	1824
May	1st to 10th	Night	25% 8% 3 8% 4 4 4 3 5% 7% 28%	2813
	11th to 20th	Night	26% 9% 2 5% 4 4 4 3 5% 7% 31%	2629
	21st to end	Night	11% 7% 2 6% 5% 5% 5% 4 7% 10% 38%	2732
June	1st to 10th	Night	12% 6% 2 5% 4 5% 5% 4 5% 8% 44%	1520
	11th to 20th	Night	11% 5% 1 6% 5% 5% 5% 5% 7% 10% 40%	1520
	21st to end	Night	10% 4 2 5% 3 4 6% 4 6% 11% 45%	1520
July	1st to 10th	Night	8% 5% 2 8% 5% 6% 5% 5% 6% 9% 41%	2520
	11th to 20th	Night	5% 5% 2 6% 5% 6% 5% 4 7% 10% 44%	2662
	21st to end	Night	10% 6% 3 8% 5% 5% 5% 4 6% 7% 40%	3087
August	1st to 10th	Night	17% 6% 2 6% 4 4 4 4 6% 9% 37%	2825
	11th to 20th	Night	12% 7% 2 6% 4 4 5% 4 7% 7% 42%	2785
	21st to end	Night	15% 4 2 5% 3 4 4 4 5% 8% 46%	3464
September	1st to 10th	Night	16% 5% 2 5% 4 3 4 3 5% 5% 47%	1900
	11th to 20th	Night	12% 5% 1 5% 3 3 3 3 5% 9% 52%	1942
	21st to end	Night	20% 5% 2 6% 4 3 3 3 5% 6% 41%	2171
October	1st to 10th	Night	16% 7% 2 5% 4 4 4 3 5% 6% 45%	2280
	11th to 20th	Night	16% 6% 2 5% 4 4 4 2 5% 8% 43%	2280
	21st to end	Night	19% 8% 2 5% 4 3 4 3 5% 7% 40%	2508
November	1st to 10th	Night	10% 6% 2 6% 5% 4 3 3 5% 6% 49%	2417
	11th to 20th	Night	15% 10% 3 7% 5% 4 4 4 6% 7% 35%	2755
	21st to end	Night	16% 9% 3 7% 5% 4 5% 4 5% 6% 35%	2723
December	1st to 10th	Night	17% 11% 5% 9% 5% 5% 5% 4 6% 7% 26%	2660
	11th to 20th	Night	16% 10% 3 8% 6% 5% 5% 4 6% 6% 30%	3285
	21st to end	Night	19% 13% 5% 10% 6% 6% 5% 4 5% 6% 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	59% 3 13% 18% 5% 2	2586
	11th to 20th	Day	68% 3 9% 11% 8% 1	2840
	21st to end	Day	71% 3 9% 13% 4 1	3124
February	1st to 10th	Day	60% 3 13% 16% 7% 1	1710
	11th to 20th	Day	56% 5% 11% 20% 7% 1	1672
	21st to end	Day	58% 3 11% 18% 8% 3	1550
March	1st to 10th	Day	56% 4 12% 21% 7% 1	3435
	11th to 20th	Day	49% 4 13% 24% 9% 1	3480
	21st to end	Day	49% 2 14% 22% 12% 1	3815
April	1st to 10th	Day	52% 5% 10% 18% 12% 2	2273
	11th to 20th	Day	49% 5% 9% 18% 16% 3	2254
	21st to end	Day	50% 4 9% 22% 12% 3	2370
May	1st to 10th	Day	57% 4 9% 20% 10% 1	4120
	11th to 20th	Day	55% 5% 12% 18% 9% 1	4264
	21st to end	Day	40% 6% 14% 24% 14% 2	4837
June	1st to 10th	Day	44% 6% 12% 23% 14% 1	2660
	11th to 20th	Day	44% 6% 13% 21% 14% 1	2660
	21st to end	Day	40% 6% 14% 26% 14% 1	2660
July	1st to 10th	Day	40% 7% 13% 25% 11% 3	4370
	11th to 20th	Day	37% 7% 15% 25% 16% 1	4219
	21st to end	Day	44% 6% 9% 23% 18% 1	4324
August	1st to 10th	Day	49% 7% 14% 21% 9%	4091
	11th to 20th	Day	44% 6% 11% 27% 11% 1	4061
	21st to end	Day	38% 5% 12% 28% 15% 2	4180
September	1st to 10th	Day	41% 6% 9% 22% 18% 4	2280
	11th to 20th	Day	37% 4 10% 28% 20% 2	2235
	21st to end	Day	48% 6% 11% 19% 16% 1	2008
October	1st to 10th	Day	39% 4 9% 26% 19% 3	3160
	11th to 20th	Day	42% 4 10% 24% 15% 5%	3140
	21st to end	Day	31% 3 14% 30% 21% 1	3428
November	1st to 10th	Day	40% 4 15% 21% 17% 4	1878
	11th to 20th	Day	49% 5% 11% 21% 12% 2	1640
	21st to end	Day	54% 3 13% 22% 8%	1552
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	59% 3 11% 19% 7% 1	4356
	11th to 20th	Night	62% 5% 13% 14% 6% 1	4120
	21st to end	Night	67% 3 8% 16% 5% 1	4532
February	1st to 10th	Night	53% 5% 11% 22% 8% 1	2470
	11th to 20th	Night	53% 5% 11% 19% 12% 1	2405
	21st to end	Night	54% 5% 10% 19% 10% 2	1900
March	1st to 10th	Night	52% 4 12% 23% 8% 1	3418
	11th to 20th	Night	43% 5% 13% 30% 9% 1	3480
	21st to end	Night	43% 4 11% 23% 18% 3	3817
April	1st to 10th	Night	53% 5% 10% 17% 14% 1	1905
	11th to 20th	Night	43% 5% 11% 22% 16% 3	1875
	21st to end	Night	45% 4 10% 24% 14% 3	1824
May	1st to 10th	Night	56% 4 8% 18% 11% 2	2840
	11th to 20th	Night	54% 5% 13% 18% 8% 1	2630
	21st to end	Night	39% 7% 15% 24% 11% 4	2739
June	1st to 10th	Night	38% 6% 13% 27% 15% 2	1520
	11th to 20th	Night	37% 8% 15% 25% 14% 2	1520
	21st to end	Night	33% 6% 17% 27% 16% 1	1520
July	1st to 10th	Night	38% 8% 14% 21% 15% 3	2480
	11th to 20th	Night	33% 7% 18% 24% 17% 1	2614
	21st to end	Night	41% 7% 13% 18% 20% 2	2988
August	1st to 10th	Night	44% 7% 17% 23% 9%	2814
	11th to 20th	Night	38% 7% 13% 28% 13% 1	2812
	21st to end	Night	36% 5% 13% 31% 13% 2	3464
September	1st to 10th	Night	40% 4 11% 23% 19% 3	1900
	11th to 20th	Night	32% 5% 10% 32% 20% 2	1942
	21st to end	Night	44% 4 11% 22% 17% 2	2171
October	1st to 10th	Night	36% 5% 11% 26% 22% 1	3800
	11th to 20th	Night	33% 5% 11% 26% 21% 5%	3779
	21st to end	Night	32% 3 12% 29% 22% 2	4120
November	1st to 10th	Night	37% 4 12% 24% 19% 3	2417
	11th to 20th	Night	47% 5% 9% 22% 13% 3	2755
	21st to end	Night	50% 4 13% 22% 9% 2	2723
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% 30% 10% 1 1	270
	21st to end	Day	29% 27% 28% 13% 2 1	297
February	1st to 10th	Day	32% 26% 26% 13% 3	270
	11th to 20th	Day	40% 26% 27% 7%	270
	21st to end	Day	37% 22% 25% 15% 1	348
March	1st to 10th	Day	34% 16% 26% 19% 5%	460
	11th to 20th	Day	33% 22% 25% 15% 5% 2	460
	21st to end	Day	32% 20% 26% 15% 5% 2	506
April	1st to 10th	Day	32% 19% 25% 17% 5% 2	460
	11th to 20th	Day	27% 17% 23% 19% 10% 3	452
	21st to end	Day	33% 17% 27% 12% 10% 1	460
May	1st to 10th	Day	32% 14% 25% 16% 9% 3	463
	11th to 20th	Day	27% 14% 29% 15% 11% 4	487
	21st to end	Day	19% 13% 25% 22% 14% 7%	529
June	1st to 10th	Day	21% 15% 26% 22% 12% 4	490
	11th to 20th	Day	19% 11% 25% 28% 14% 3	490
	21st to end	Day	17% 13% 28% 26% 14% 3	490
July	1st to 10th	Day	13% 7% 26% 26% 18% 9%	485
	11th to 20th	Day	8% 9% 28% 29% 19% 8%	484
	21st to end	Day	14% 6% 29% 29% 17% 6%	532
August	1st to 10th	Day	13% 8% 23% 26% 20% 10%	486
	11th to 20th	Day	15% 7% 23% 25% 19% 10%	479
	21st to end	Day	15% 7% 24% 24% 16% 13%	539
September	1st to 10th	Day	20% 8% 17% 27% 18% 10%	490
	11th to 20th	Day	18% 4 18% 28% 22% 10%	490
	21st to end	Day	31% 11% 20% 19% 14% 5%	490
October	1st to 10th	Day	24% 9% 19% 25% 17% 6%	490
	11th to 20th	Day	24% 13% 28% 21% 12% 2	490
	21st to end	Day	22% 19% 27% 22% 9% 1	539
November	1st to 10th	Day	22% 15% 24% 24% 13% 2	455
	11th to 20th	Day	26% 21% 27% 20% 6%	240
	21st to end	Day	30% 23% 29% 13% 3 1	188
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% 15% 29% 23% 3	760
	21st to end	Night	23% 20% 29% 25% 3	836
February	1st to 10th	Night	27% 16% 27% 28% 3	760
	11th to 20th	Night	28% 21% 32% 18% 1	743
	21st to end	Night	28% 15% 30% 24% 2	628
March	1st to 10th	Night	24% 18% 29% 25% 4	760
	11th to 20th	Night	28% 18% 25% 22% 6%	760
	21st to end	Night	24% 16% 31% 22% 6%	836
April	1st to 10th	Night	25% 19% 28% 23% 4	760
	11th to 20th	Night	21% 15% 25% 29% 8% 1	751
	21st to end	Night	23% 11% 26% 32% 7%	684
May	1st to 10th	Night	23% 10% 22% 33% 12% 1	570
	11th to 20th	Night	22% 8% 23% 36% 11%	456
	21st to end	Night	14% 8% 18% 36% 22% 2	411
June	1st to 10th	Night	13% 7% 23% 38% 19%	380
	11th to 20th	Night	15% 5% 22% 38% 19% 1	380
	21st to end	Night	11% 5% 23% 43% 17% 1	380
July	1st to 10th	Night	12% 2 17% 43% 24% 3	370
	11th to 20th	Night	7% 3 16% 39% 32% 2	445
	21st to end	Night	9% 2 18% 43% 26% 2	624
August	1st to 10th	Night	9% 2 13% 43% 31% 2	567
	11th to 20th	Night	14% 4 13% 38% 28% 4	564
	21st to end	Night	15% 3 14% 35% 30% 3	824
September	1st to 10th	Night	17% 4 16% 31% 28% 3	760
	11th to 20th	Night	14% 5% 13% 31% 32% 4	760
	21st to end	Night	23% 7% 17% 30% 20% 3	760
October	1st to 10th	Night	19% 7% 20% 30% 21% 3	760
	11th to 20th	Night	22% 11% 23% 31% 13% 1	760
	21st to end	Night	25% 13% 22% 31% 9%	836
November	1st to 10th	Night	15% 11% 25% 37% 11% 1	780
	11th to 20th	Night	27% 15% 22% 28% 8% 1	800
	21st to end	Night	25% 16% 25% 28% 6% 1	779
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

Page generated at 2024-11-22 08:02:24. Version ac07

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