Caney Ridge Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caney Ridge Observatory clear sky chart from 2005-11-06 to 2024-02-15.

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	13% 9% 4 7% 6% 4 5% 5% 6% 7% 34%	78703
	Night	13% 9% 4 7% 6% 3 5% 5% 5% 7% 37%	80385
Transparency	Day	47% 7% 11% 19% 13% 2	78426
	Night	46% 7% 11% 20% 14% 3	80181
Seeing	Day	20% 13% 24% 22% 15% 6%	13970
	Night	19% 11% 22% 29% 17% 2	24137

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	13% 14% 6% 15% 7% 3 4 4 4 6% 26%	2836
	11th to 20th	Day	14% 14% 8% 11% 7% 6% 4 4 4 3 26%	2840
	21st to end	Day	15% 15% 9% 7% 5% 3 4 4 4 5% 28%	3124
February	1st to 10th	Day	14% 12% 6% 9% 7% 4 4 3 5% 6% 30%	1738
	11th to 20th	Day	18% 11% 6% 8% 6% 3 5% 4 5% 5% 28%	1788
	21st to end	Day	18% 11% 4 9% 6% 3 4 4 5% 5% 30%	1480
March	1st to 10th	Day	15% 11% 5% 5% 5% 3 3 4 5% 6% 38%	1926
	11th to 20th	Day	18% 10% 5% 7% 7% 4 3 6% 5% 6% 29%	1980
	21st to end	Day	17% 11% 4 6% 6% 3 4 4 5% 6% 34%	2178
April	1st to 10th	Day	11% 8% 4 6% 5% 3 6% 6% 5% 8% 38%	1980
	11th to 20th	Day	13% 8% 4 5% 6% 3 4 4 5% 8% 41%	2203
	21st to end	Day	15% 8% 3 6% 5% 3 5% 4 5% 8% 37%	2340
May	1st to 10th	Day	14% 9% 4 6% 6% 4 6% 6% 6% 7% 32%	2340
	11th to 20th	Day	17% 8% 4 7% 6% 4 5% 6% 6% 7% 30%	2301
	21st to end	Day	12% 5% 3 6% 7% 4 6% 6% 7% 10% 34%	2531
June	1st to 10th	Day	10% 7% 3 6% 6% 4 6% 7% 7% 9% 36%	2340
	11th to 20th	Day	7% 6% 3 6% 7% 4 7% 7% 7% 10% 35%	2340
	21st to end	Day	9% 5% 3 6% 7% 5% 7% 7% 7% 10% 36%	2340
July	1st to 10th	Day	11% 7% 3 5% 7% 5% 6% 7% 8% 8% 32%	2340
	11th to 20th	Day	10% 6% 2 6% 7% 5% 8% 7% 8% 9% 32%	2340
	21st to end	Day	11% 6% 4 7% 8% 6% 9% 7% 7% 9% 27%	2547
August	1st to 10th	Day	10% 5% 3 7% 8% 6% 7% 9% 8% 11% 27%	2327
	11th to 20th	Day	12% 8% 3 6% 8% 5% 7% 7% 7% 10% 27%	2303
	21st to end	Day	10% 6% 3 6% 7% 4 6% 6% 6% 9% 36%	2452
September	1st to 10th	Day	12% 6% 2 6% 6% 3 5% 5% 7% 8% 39%	1980
	11th to 20th	Day	13% 7% 3 6% 6% 4 5% 5% 5% 8% 38%	1980
	21st to end	Day	18% 6% 3 5% 5% 2 4 4 5% 7% 40%	1980
October	1st to 10th	Day	14% 5% 3 5% 5% 3 5% 4 5% 7% 45%	1931
	11th to 20th	Day	13% 7% 3 5% 5% 3 4 3 5% 6% 46%	1800
	21st to end	Day	17% 10% 3 5% 4 2 4 4 4 6% 42%	1980
November	1st to 10th	Day	11% 7% 2 4 3 3 3 4 5% 7% 51%	1731
	11th to 20th	Day	12% 9% 3 6% 5% 3 4 4 5% 7% 42%	1710
	21st to end	Day	14% 9% 3 7% 6% 3 3 3 5% 7% 41%	1710
December	1st to 10th	Day	18% 13% 6% 8% 5% 3 4 4 4 5% 30%	1710
	11th to 20th	Day	13% 13% 5% 8% 4 3 3 5% 6% 8% 32%	2153
	21st to end	Day	14% 15% 4 8% 7% 4 6% 7% 6% 6% 23%	3124
January	1st to 10th	Night	13% 14% 8% 12% 8% 3 5% 4 4 4 25%	4109
	11th to 20th	Night	17% 12% 5% 8% 8% 3 3 3 4 4 32%	4120
	21st to end	Night	15% 14% 5% 8% 7% 3 5% 4 4 6% 30%	4532
February	1st to 10th	Night	15% 10% 5% 9% 6% 3 4 4 5% 7% 33%	2437
	11th to 20th	Night	20% 11% 4 8% 6% 4 5% 4 4 4 28%	2153
	21st to end	Night	16% 16% 5% 8% 6% 3 6% 5% 4 6% 26%	1776
March	1st to 10th	Night	14% 12% 5% 6% 5% 3 4 4 4 4 38%	2034
	11th to 20th	Night	17% 10% 5% 5% 6% 3 5% 5% 6% 7% 31%	1980
	21st to end	Night	13% 11% 4 7% 6% 4 5% 4 5% 6% 34%	2178
April	1st to 10th	Night	11% 8% 3 6% 4 3 4 5% 6% 7% 42%	1980
	11th to 20th	Night	12% 7% 3 5% 6% 3 5% 4 6% 7% 42%	1720
	21st to end	Night	14% 7% 3 6% 5% 3 4 5% 5% 8% 40%	1620
May	1st to 10th	Night	13% 7% 3 6% 7% 4 5% 5% 5% 7% 38%	1620
	11th to 20th	Night	13% 7% 3 5% 6% 3 5% 6% 8% 10% 33%	1592
	21st to end	Night	8% 6% 3 7% 6% 4 5% 5% 7% 10% 39%	1744
June	1st to 10th	Night	9% 5% 2 5% 5% 3 6% 5% 7% 11% 42%	1620
	11th to 20th	Night	5% 5% 3 5% 5% 3 6% 7% 8% 11% 42%	1620
	21st to end	Night	7% 6% 3 6% 6% 4 6% 6% 7% 10% 38%	1620
July	1st to 10th	Night	10% 5% 2 5% 6% 3 5% 6% 7% 9% 41%	1620
	11th to 20th	Night	7% 5% 2 5% 5% 3 6% 7% 8% 10% 41%	1620
	21st to end	Night	7% 5% 4 5% 5% 4 7% 5% 8% 12% 38%	1771
August	1st to 10th	Night	8% 5% 2 7% 7% 4 4 7% 8% 11% 38%	1611
	11th to 20th	Night	9% 7% 3 5% 7% 4 5% 6% 7% 9% 37%	1598
	21st to end	Night	7% 5% 2 5% 5% 3 5% 6% 7% 9% 45%	1879
September	1st to 10th	Night	12% 6% 3 5% 5% 4 4 4 5% 7% 46%	1980
	11th to 20th	Night	13% 7% 3 5% 4 2 4 5% 5% 7% 46%	1980
	21st to end	Night	12% 6% 2 4 6% 3 4 4 5% 6% 48%	1980
October	1st to 10th	Night	13% 5% 2 4 4 3 4 4 4 7% 50%	2029
	11th to 20th	Night	13% 7% 2 5% 5% 3 4 4 4 6% 46%	2160
	21st to end	Night	13% 9% 3 5% 5% 2 3 3 4 5% 45%	2376
November	1st to 10th	Night	12% 6% 3 5% 4 2 4 3 4 5% 52%	2342
	11th to 20th	Night	12% 9% 4 6% 4 3 4 4 4 7% 44%	2470
	21st to end	Night	13% 9% 3 6% 4 3 4 4 5% 6% 43%	2470
December	1st to 10th	Night	15% 13% 5% 9% 6% 3 4 4 5% 6% 29%	2470
	11th to 20th	Night	15% 12% 5% 10% 6% 3 4 4 4 6% 31%	3042
	21st to end	Night	12% 14% 6% 10% 8% 4 5% 6% 6% 8% 21%	4532

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% 5% 6% 16% 12% 2	2837
	11th to 20th	Day	63% 5% 7% 14% 11% 1	2840
	21st to end	Day	57% 6% 7% 16% 14% 1	3124
February	1st to 10th	Day	56% 5% 6% 17% 14% 1	1738
	11th to 20th	Day	57% 5% 8% 17% 11% 2	1798
	21st to end	Day	55% 5% 9% 14% 13% 4	1480
March	1st to 10th	Day	47% 4 7% 23% 16% 3	1926
	11th to 20th	Day	54% 7% 8% 17% 11% 3	1980
	21st to end	Day	51% 5% 10% 23% 9% 2	2178
April	1st to 10th	Day	43% 7% 11% 22% 14% 4	1980
	11th to 20th	Day	41% 6% 9% 20% 19% 4	2203
	21st to end	Day	46% 6% 12% 23% 11% 2	2340
May	1st to 10th	Day	49% 8% 13% 18% 11% 2	2340
	11th to 20th	Day	52% 8% 12% 20% 7% 1	2305
	21st to end	Day	42% 10% 15% 23% 8% 1	2531
June	1st to 10th	Day	41% 9% 15% 22% 12% 1	2340
	11th to 20th	Day	41% 11% 15% 17% 14% 2	2340
	21st to end	Day	41% 10% 13% 20% 15% 2	2340
July	1st to 10th	Day	45% 9% 15% 17% 11% 2	2275
	11th to 20th	Day	42% 11% 15% 18% 12% 2	2271
	21st to end	Day	47% 11% 13% 19% 9% 1	2405
August	1st to 10th	Day	47% 11% 17% 17% 8%	2314
	11th to 20th	Day	47% 11% 14% 18% 10%	2303
	21st to end	Day	41% 10% 14% 19% 13% 2	2452
September	1st to 10th	Day	39% 8% 14% 22% 13% 4	1980
	11th to 20th	Day	43% 7% 8% 24% 16% 2	1980
	21st to end	Day	43% 6% 11% 22% 17% 2	1980
October	1st to 10th	Day	38% 6% 10% 24% 19% 4	1931
	11th to 20th	Day	38% 5% 10% 24% 20% 3	1800
	21st to end	Day	43% 5% 6% 25% 16% 4	1980
November	1st to 10th	Day	33% 5% 8% 23% 26% 4	1731
	11th to 20th	Day	41% 5% 7% 22% 20% 5%	1710
	21st to end	Day	43% 5% 9% 20% 19% 3	1710
December	1st to 10th	Day	57% 6% 7% 19% 9% 2	1710
	11th to 20th	Day	49% 6% 10% 16% 16% 3	2150
	21st to end	Day	58% 8% 10% 18% 7%	3124
January	1st to 10th	Night	62% 6% 6% 14% 11% 2	4109
	11th to 20th	Night	55% 5% 7% 15% 16% 2	4120
	21st to end	Night	55% 6% 8% 17% 12% 1	4532
February	1st to 10th	Night	52% 4 10% 19% 13% 1	2437
	11th to 20th	Night	59% 6% 6% 17% 10% 3	2154
	21st to end	Night	58% 6% 8% 15% 10% 4	1776
March	1st to 10th	Night	50% 4 8% 17% 19% 3	2034
	11th to 20th	Night	51% 7% 10% 22% 9% 2	1980
	21st to end	Night	51% 7% 9% 19% 12% 2	2178
April	1st to 10th	Night	40% 7% 11% 23% 16% 3	1980
	11th to 20th	Night	40% 5% 11% 21% 18% 6%	1720
	21st to end	Night	42% 6% 13% 26% 11% 1	1620
May	1st to 10th	Night	44% 9% 14% 20% 11% 1	1620
	11th to 20th	Night	43% 11% 16% 21% 8% 1	1593
	21st to end	Night	39% 9% 17% 24% 10% 1	1745
June	1st to 10th	Night	35% 10% 19% 20% 15% 1	1620
	11th to 20th	Night	33% 12% 19% 20% 14% 2	1620
	21st to end	Night	38% 10% 15% 21% 13% 3	1620
July	1st to 10th	Night	38% 9% 15% 23% 13% 2	1575
	11th to 20th	Night	35% 9% 20% 20% 13% 4	1566
	21st to end	Night	34% 13% 18% 23% 11% 1	1672
August	1st to 10th	Night	37% 9% 19% 23% 11% 1	1600
	11th to 20th	Night	40% 11% 18% 20% 11% 1	1598
	21st to end	Night	33% 9% 17% 27% 14% 1	1879
September	1st to 10th	Night	37% 8% 15% 21% 15% 5%	1980
	11th to 20th	Night	37% 7% 11% 23% 20% 2	1980
	21st to end	Night	36% 7% 12% 24% 19% 2	1980
October	1st to 10th	Night	33% 7% 10% 23% 21% 6%	2029
	11th to 20th	Night	38% 6% 8% 25% 19% 4	2160
	21st to end	Night	41% 5% 5% 24% 19% 6%	2376
November	1st to 10th	Night	36% 5% 8% 21% 25% 6%	2342
	11th to 20th	Night	41% 5% 7% 20% 20% 7%	2470
	21st to end	Night	41% 5% 7% 25% 18% 4	2470
December	1st to 10th	Night	57% 6% 8% 18% 10% 2	2470
	11th to 20th	Night	55% 5% 7% 18% 13% 2	3044
	21st to end	Night	56% 9% 11% 14% 10% 1	4532

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	27% 27% 31% 11% 3	270
	11th to 20th	Day	41% 25% 23% 10% 2	270
	21st to end	Day	29% 31% 29% 8% 3	297
February	1st to 10th	Day	29% 26% 33% 9% 3	270
	11th to 20th	Day	45% 28% 21% 4 1	252
	21st to end	Day	37% 26% 30% 6% 2	198
March	1st to 10th	Day	27% 22% 28% 18% 5%	366
	11th to 20th	Day	26% 23% 31% 17% 3 1	420
	21st to end	Day	31% 19% 28% 16% 6%	462
April	1st to 10th	Day	25% 19% 26% 18% 10% 2	420
	11th to 20th	Day	21% 18% 29% 19% 11% 2	412
	21st to end	Day	25% 15% 28% 21% 9% 3	420
May	1st to 10th	Day	24% 19% 28% 15% 10% 4	423
	11th to 20th	Day	19% 11% 26% 28% 10% 7%	447
	21st to end	Day	17% 6% 21% 27% 18% 11%	485
June	1st to 10th	Day	12% 5% 26% 27% 21% 8%	450
	11th to 20th	Day	10% 6% 22% 27% 24% 12%	450
	21st to end	Day	12% 6% 26% 28% 17% 11%	450
July	1st to 10th	Day	13% 5% 19% 23% 24% 17%	445
	11th to 20th	Day	7% 4 16% 31% 27% 15%	444
	21st to end	Day	12% 4 16% 29% 27% 13%	488
August	1st to 10th	Day	13% 5% 17% 29% 23% 14%	446
	11th to 20th	Day	15% 4 14% 29% 24% 14%	439
	21st to end	Day	12% 4 14% 29% 25% 16%	495
September	1st to 10th	Day	9% 6% 18% 25% 32% 11%	450
	11th to 20th	Day	14% 4 13% 28% 28% 13%	450
	21st to end	Day	19% 10% 19% 25% 21% 5%	450
October	1st to 10th	Day	21% 7% 18% 26% 20% 8%	450
	11th to 20th	Day	18% 14% 27% 23% 16% 2	450
	21st to end	Day	24% 14% 24% 23% 11% 3	495
November	1st to 10th	Day	19% 15% 31% 23% 10% 2	329
	11th to 20th	Day	23% 19% 33% 18% 7%	270
	21st to end	Day	21% 21% 34% 19% 4 1	270
December	1st to 10th	Day	31% 21% 32% 13% 2	270
	11th to 20th	Day	27% 17% 34% 17% 4 1	270
	21st to end	Day	26% 25% 33% 12% 4	297
January	1st to 10th	Night	25% 20% 29% 23% 4	760
	11th to 20th	Night	29% 20% 27% 20% 4	760
	21st to end	Night	23% 20% 32% 22% 3	836
February	1st to 10th	Night	23% 18% 31% 25% 3	760
	11th to 20th	Night	32% 21% 29% 17% 1	722
	21st to end	Night	30% 20% 30% 18% 2	592
March	1st to 10th	Night	22% 18% 30% 25% 5%	720
	11th to 20th	Night	27% 15% 28% 23% 7% 1	720
	21st to end	Night	22% 18% 27% 26% 8%	792
April	1st to 10th	Night	20% 16% 29% 27% 8%	720
	11th to 20th	Night	17% 14% 28% 28% 12% 1	597
	21st to end	Night	19% 8% 32% 31% 8% 1	540
May	1st to 10th	Night	16% 12% 24% 34% 12% 2	540
	11th to 20th	Night	16% 5% 21% 38% 18% 2	531
	21st to end	Night	12% 2 15% 36% 30% 5%	584
June	1st to 10th	Night	9% 4 15% 39% 29% 4	540
	11th to 20th	Night	7% 2 14% 36% 34% 6%	540
	21st to end	Night	9% 3 15% 41% 28% 4	540
July	1st to 10th	Night	13% 1 8% 32% 40% 6%	525
	11th to 20th	Night	10% 1 8% 31% 43% 6%	522
	21st to end	Night	9% 3 9% 33% 40% 7%	591
August	1st to 10th	Night	9% 2 7% 35% 41% 5%	537
	11th to 20th	Night	11% 3 7% 37% 36% 6%	534
	21st to end	Night	9% 3 6% 34% 38% 9%	626
September	1st to 10th	Night	13% 4 9% 30% 39% 5%	720
	11th to 20th	Night	16% 3 11% 30% 33% 6%	720
	21st to end	Night	15% 3 19% 33% 26% 3	720
October	1st to 10th	Night	15% 7% 19% 29% 25% 6%	720
	11th to 20th	Night	18% 9% 22% 33% 16% 2	720
	21st to end	Night	21% 11% 22% 32% 13% 1	792
November	1st to 10th	Night	17% 7% 23% 33% 18% 2	740
	11th to 20th	Night	17% 17% 25% 29% 11% 1	760
	21st to end	Night	20% 15% 24% 31% 9% 1	760
December	1st to 10th	Night	26% 15% 28% 24% 7%	760
	11th to 20th	Night	21% 15% 28% 29% 6% 1	760
	21st to end	Night	25% 17% 27% 28% 4	836

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