Caney Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caney 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% 7% 3 5% 5% 3 4 4 5% 7% 44%	78466
	Night	13% 7% 3 5% 4 2 4 4 4 7% 47%	80640
Transparency	Day	39% 7% 12% 23% 16% 3	78189
	Night	37% 6% 11% 24% 19% 4	80437
Seeing	Day	17% 11% 26% 26% 17% 4	14446
	Night	17% 10% 27% 30% 14% 1	24457

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% 11% 3 4 5% 2 4 4 3 4 47%	2847
	11th to 20th	Day	12% 8% 3 6% 5% 3 3 4 4 6% 46%	2850
	21st to end	Day	22% 9% 3 6% 4 2 2 3 3 4 42%	3135
February	1st to 10th	Day	16% 10% 4 6% 6% 2 4 4 4 5% 39%	1710
	11th to 20th	Day	16% 9% 3 6% 5% 3 4 3 3 6% 43%	1667
	21st to end	Day	18% 11% 3 5% 5% 2 5% 3 4 6% 37%	1520
March	1st to 10th	Day	15% 9% 3 5% 4 2 3 4 5% 5% 45%	1980
	11th to 20th	Day	20% 8% 2 6% 5% 2 4 4 4 5% 39%	1980
	21st to end	Day	20% 9% 3 7% 5% 3 4 5% 5% 6% 32%	2178
April	1st to 10th	Day	13% 7% 3 5% 5% 3 4 4 6% 7% 45%	2150
	11th to 20th	Day	18% 8% 3 6% 4 3 4 4 5% 5% 39%	2134
	21st to end	Day	21% 8% 3 6% 5% 3 4 4 4 5% 37%	2160
May	1st to 10th	Day	19% 7% 3 5% 6% 3 5% 4 6% 7% 36%	2247
	11th to 20th	Day	15% 7% 3 6% 5% 3 5% 4 5% 8% 41%	2302
	21st to end	Day	11% 6% 3 5% 7% 4 7% 6% 7% 10% 35%	2642
June	1st to 10th	Day	8% 5% 2 4 6% 3 6% 5% 7% 9% 45%	2520
	11th to 20th	Day	6% 4 2 4 6% 4 5% 6% 7% 10% 46%	2520
	21st to end	Day	5% 3 2 4 4 4 6% 5% 7% 10% 51%	2520
July	1st to 10th	Day	10% 5% 2 5% 5% 4 6% 7% 7% 11% 40%	2373
	11th to 20th	Day	5% 3 1 4 5% 4 7% 6% 7% 11% 48%	2340
	21st to end	Day	8% 6% 2 5% 5% 4 5% 6% 6% 10% 42%	2546
August	1st to 10th	Day	9% 4 2 5% 6% 4 6% 6% 8% 11% 40%	2328
	11th to 20th	Day	10% 5% 2 6% 6% 3 5% 6% 6% 9% 43%	2209
	21st to end	Day	7% 4 2 4 5% 3 4 4 6% 8% 50%	2376
September	1st to 10th	Day	12% 4 2 5% 5% 3 5% 4 6% 7% 48%	2160
	11th to 20th	Day	11% 7% 2 5% 5% 3 5% 4 5% 7% 47%	2138
	21st to end	Day	7% 5% 2 4 4 3 4 4 6% 6% 56%	1887
October	1st to 10th	Day	11% 3 2 5% 4 3 3 4 4 6% 55%	1800
	11th to 20th	Day	15% 5% 2 4 4 2 3 3 3 5% 54%	1800
	21st to end	Day	19% 7% 2 4 3 2 4 2 4 5% 47%	1980
November	1st to 10th	Day	14% 5% 2 3 2 2 3 3 3 5% 58%	1858
	11th to 20th	Day	14% 6% 2 5% 3 2 3 4 4 6% 51%	1761
	21st to end	Day	20% 6% 3 4 5% 2 3 4 3 4 47%	1549
December	1st to 10th	Day	14% 8% 3 6% 4 2 4 4 4 5% 45%	1520
	11th to 20th	Day	14% 11% 3 7% 5% 3 4 4 3 4 42%	1918
	21st to end	Day	15% 18% 4 6% 5% 3 4 4 4 6% 31%	2861
January	1st to 10th	Night	13% 8% 5% 7% 6% 3 4 4 4 5% 41%	4108
	11th to 20th	Night	13% 6% 2 7% 6% 2 4 4 4 6% 45%	4120
	21st to end	Night	22% 11% 5% 4 3 2 2 3 3 4 41%	4532
February	1st to 10th	Night	16% 9% 3 6% 4 2 3 4 5% 6% 42%	2470
	11th to 20th	Night	16% 7% 4 6% 5% 3 3 3 3 5% 46%	2274
	21st to end	Night	18% 8% 3 4 4 2 3 4 4 6% 44%	1750
March	1st to 10th	Night	16% 7% 3 5% 4 3 3 3 4 5% 45%	1980
	11th to 20th	Night	18% 9% 3 5% 4 2 4 4 5% 5% 41%	1980
	21st to end	Night	20% 9% 3 6% 4 3 4 5% 5% 6% 36%	2178
April	1st to 10th	Night	12% 5% 2 3 4 2 3 4 5% 8% 52%	1809
	11th to 20th	Night	14% 6% 2 4 3 2 4 5% 5% 7% 47%	1775
	21st to end	Night	19% 7% 2 5% 4 2 4 4 6% 7% 40%	1800
May	1st to 10th	Night	15% 6% 2 5% 4 2 4 4 4 7% 46%	1710
	11th to 20th	Night	16% 6% 2 4 4 2 3 4 5% 7% 47%	1593
	21st to end	Night	10% 6% 3 6% 5% 3 5% 5% 7% 10% 40%	1630
June	1st to 10th	Night	8% 3 1 4 3 2 3 4 6% 10% 54%	1440
	11th to 20th	Night	5% 2 2 3 3 3 3 5% 6% 11% 57%	1440
	21st to end	Night	2 2 2 3 3 2 4 4 6% 9% 62%	1440
July	1st to 10th	Night	5% 3 2 4 5% 3 6% 7% 7% 9% 49%	1581
	11th to 20th	Night	4 2 1 3 4 2 4 5% 6% 9% 60%	1620
	21st to end	Night	5% 4 3 4 5% 4 4 4 6% 10% 52%	1772
August	1st to 10th	Night	6% 3 2 4 5% 2 5% 6% 8% 10% 50%	1611
	11th to 20th	Night	7% 3 2 3 4 3 4 4 6% 10% 53%	1689
	21st to end	Night	6% 4 2 4 4 3 4 5% 5% 8% 56%	1980
September	1st to 10th	Night	8% 3 2 4 4 3 4 4 5% 8% 56%	1800
	11th to 20th	Night	9% 5% 2 5% 4 3 4 5% 5% 8% 51%	1818
	21st to end	Night	8% 3 2 4 4 2 3 4 4 7% 59%	2054
October	1st to 10th	Night	7% 4 2 3 4 2 3 4 5% 7% 58%	2160
	11th to 20th	Night	15% 4 1 4 3 2 3 4 4 5% 54%	2160
	21st to end	Night	17% 6% 3 4 4 2 2 3 3 5% 50%	2376
November	1st to 10th	Night	11% 6% 2 4 3 2 3 3 3 6% 58%	2220
	11th to 20th	Night	12% 6% 2 4 3 1 3 4 4 5% 54%	2417
	21st to end	Night	17% 8% 2 4 4 2 3 3 4 6% 47%	2626
December	1st to 10th	Night	16% 8% 3 4 4 3 3 4 4 7% 44%	2660
	11th to 20th	Night	16% 10% 3 6% 5% 2 3 4 3 5% 43%	3279
	21st to end	Night	19% 16% 4 6% 5% 2 3 4 4 4 32%	4788

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	42% 4 7% 27% 18% 2	2848
	11th to 20th	Day	39% 4 12% 26% 14% 4	2850
	21st to end	Day	48% 4 9% 18% 17% 4	3135
February	1st to 10th	Day	47% 5% 11% 22% 12% 2	1710
	11th to 20th	Day	44% 4 11% 22% 15% 4	1676
	21st to end	Day	49% 5% 7% 21% 13% 7%	1520
March	1st to 10th	Day	41% 5% 8% 20% 19% 6%	1980
	11th to 20th	Day	47% 7% 9% 20% 14% 4	1980
	21st to end	Day	51% 7% 12% 18% 11% 1	2178
April	1st to 10th	Day	38% 7% 11% 24% 18% 2	2150
	11th to 20th	Day	45% 6% 12% 19% 14% 4	2134
	21st to end	Day	50% 5% 9% 20% 13% 1	2160
May	1st to 10th	Day	46% 8% 12% 21% 12% 1	2247
	11th to 20th	Day	42% 7% 14% 23% 12% 2	2306
	21st to end	Day	42% 12% 14% 21% 11% 1	2642
June	1st to 10th	Day	34% 9% 14% 26% 14% 1	2520
	11th to 20th	Day	31% 8% 15% 29% 14% 2	2520
	21st to end	Day	26% 9% 16% 29% 16% 5%	2520
July	1st to 10th	Day	36% 11% 17% 22% 13% 2	2309
	11th to 20th	Day	27% 10% 17% 26% 18% 3	2271
	21st to end	Day	34% 9% 16% 29% 11% 1	2405
August	1st to 10th	Day	34% 11% 18% 23% 13% 1	2314
	11th to 20th	Day	36% 8% 15% 26% 14% 1	2209
	21st to end	Day	30% 8% 14% 24% 18% 6%	2376
September	1st to 10th	Day	34% 8% 11% 25% 15% 7%	2160
	11th to 20th	Day	36% 6% 9% 23% 23% 2	2138
	21st to end	Day	28% 6% 9% 29% 26% 3	1887
October	1st to 10th	Day	30% 6% 10% 25% 24% 5%	1800
	11th to 20th	Day	34% 3 9% 24% 24% 7%	1800
	21st to end	Day	40% 4 8% 25% 16% 6%	1980
November	1st to 10th	Day	31% 4 9% 28% 21% 6%	1858
	11th to 20th	Day	35% 4 8% 23% 24% 7%	1761
	21st to end	Day	42% 4 9% 19% 23% 2	1549
December	1st to 10th	Day	41% 5% 10% 27% 15% 2	1520
	11th to 20th	Day	45% 5% 6% 19% 23% 2	1915
	21st to end	Day	51% 8% 9% 18% 12% 2	2861
January	1st to 10th	Night	43% 7% 9% 23% 16% 2	4108
	11th to 20th	Night	37% 7% 12% 26% 16% 2	4120
	21st to end	Night	47% 4 10% 20% 17% 2	4532
February	1st to 10th	Night	42% 5% 11% 23% 15% 3	2470
	11th to 20th	Night	42% 4 10% 23% 19% 3	2275
	21st to end	Night	42% 4 10% 20% 17% 7%	1750
March	1st to 10th	Night	41% 4 10% 19% 18% 8%	1980
	11th to 20th	Night	45% 6% 10% 19% 17% 3	1980
	21st to end	Night	49% 6% 10% 22% 12% 2	2178
April	1st to 10th	Night	31% 5% 12% 25% 22% 4	1809
	11th to 20th	Night	36% 7% 10% 24% 18% 6%	1775
	21st to end	Night	43% 6% 11% 24% 16% 1	1800
May	1st to 10th	Night	38% 7% 13% 23% 17% 3	1710
	11th to 20th	Night	36% 7% 15% 23% 16% 3	1594
	21st to end	Night	38% 10% 16% 22% 13% 1	1631
June	1st to 10th	Night	26% 8% 15% 31% 18% 2	1440
	11th to 20th	Night	20% 8% 16% 34% 19% 3	1440
	21st to end	Night	20% 7% 16% 31% 19% 7%	1440
July	1st to 10th	Night	27% 11% 18% 24% 18% 2	1536
	11th to 20th	Night	19% 9% 14% 31% 24% 3	1566
	21st to end	Night	26% 8% 14% 36% 15% 1	1673
August	1st to 10th	Night	25% 10% 18% 34% 13% 1	1601
	11th to 20th	Night	26% 8% 16% 29% 18% 2	1689
	21st to end	Night	24% 9% 15% 26% 20% 6%	1980
September	1st to 10th	Night	26% 6% 12% 30% 19% 7%	1800
	11th to 20th	Night	32% 7% 10% 22% 24% 5%	1818
	21st to end	Night	26% 5% 11% 22% 33% 4	2054
October	1st to 10th	Night	24% 5% 13% 25% 26% 6%	2160
	11th to 20th	Night	32% 4 9% 23% 26% 7%	2160
	21st to end	Night	39% 4 8% 21% 20% 8%	2376
November	1st to 10th	Night	30% 4 8% 26% 24% 8%	2220
	11th to 20th	Night	31% 4 8% 24% 26% 6%	2417
	21st to end	Night	39% 5% 8% 23% 22% 3	2626
December	1st to 10th	Night	40% 5% 11% 23% 19% 2	2660
	11th to 20th	Night	45% 3 8% 22% 19% 2	3281
	21st to end	Night	53% 7% 10% 18% 10% 2	4788

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	24% 24% 33% 16% 3	270
	11th to 20th	Day	32% 22% 34% 9% 2	270
	21st to end	Day	25% 28% 29% 15% 2	297
February	1st to 10th	Day	26% 20% 39% 11% 3	270
	11th to 20th	Day	32% 24% 30% 11% 3	252
	21st to end	Day	38% 20% 34% 7% 1	198
March	1st to 10th	Day	28% 23% 35% 13% 2	240
	11th to 20th	Day	35% 19% 31% 15% 1	240
	21st to end	Day	28% 25% 39% 6% 2	264
April	1st to 10th	Day	22% 20% 31% 20% 6%	410
	11th to 20th	Day	25% 20% 31% 18% 6%	412
	21st to end	Day	25% 19% 32% 19% 5%	420
May	1st to 10th	Day	21% 15% 33% 22% 8%	510
	11th to 20th	Day	18% 12% 31% 24% 12% 3	625
	21st to end	Day	12% 8% 35% 25% 17% 4	679
June	1st to 10th	Day	11% 4 20% 33% 26% 6%	630
	11th to 20th	Day	6% 3 21% 39% 26% 5%	630
	21st to end	Day	5% 4 28% 36% 22% 5%	630
July	1st to 10th	Day	12% 3 14% 33% 31% 8%	621
	11th to 20th	Day	6% 2 15% 35% 31% 10%	618
	21st to end	Day	9% 1 13% 32% 32% 13%	684
August	1st to 10th	Day	10% 2 14% 38% 30% 6%	626
	11th to 20th	Day	12% 2 14% 32% 32% 7%	523
	21st to end	Day	10% 2 12% 30% 32% 15%	495
September	1st to 10th	Day	10% 2 12% 34% 32% 10%	450
	11th to 20th	Day	8% 3 16% 34% 29% 9%	428
	21st to end	Day	8% 8% 26% 31% 24% 3	270
October	1st to 10th	Day	11% 9% 30% 33% 14% 2	270
	11th to 20th	Day	16% 16% 38% 23% 7%	270
	21st to end	Day	30% 15% 32% 19% 4	297
November	1st to 10th	Day	19% 14% 29% 29% 8% 1	270
	11th to 20th	Day	20% 18% 35% 19% 7% 1	270
	21st to end	Day	29% 16% 27% 19% 8% 2	270
December	1st to 10th	Day	17% 26% 32% 17% 6% 2	270
	11th to 20th	Day	26% 20% 27% 20% 6% 1	270
	21st to end	Day	24% 25% 35% 12% 3	297
January	1st to 10th	Night	21% 17% 33% 23% 5%	950
	11th to 20th	Night	22% 18% 35% 21% 4	950
	21st to end	Night	21% 18% 36% 22% 3	1045
February	1st to 10th	Night	21% 16% 37% 22% 3	950
	11th to 20th	Night	22% 18% 38% 21% 1	844
	21st to end	Night	25% 18% 35% 20% 2	566
March	1st to 10th	Night	20% 16% 34% 28% 3	540
	11th to 20th	Night	25% 13% 31% 25% 6%	540
	21st to end	Night	24% 12% 37% 22% 5%	594
April	1st to 10th	Night	16% 13% 39% 27% 4	540
	11th to 20th	Night	19% 14% 35% 26% 7%	533
	21st to end	Night	22% 12% 37% 21% 7%	540
May	1st to 10th	Night	16% 8% 32% 35% 10%	540
	11th to 20th	Night	17% 7% 26% 31% 17% 1	531
	21st to end	Night	13% 4 25% 36% 19% 2	584
June	1st to 10th	Night	10% 4 14% 39% 32% 2	540
	11th to 20th	Night	6% 1 21% 44% 26% 2	540
	21st to end	Night	2 1 19% 44% 31% 2	540
July	1st to 10th	Night	7% 1 10% 39% 37% 6%	525
	11th to 20th	Night	4 1 11% 39% 41% 6%	522
	21st to end	Night	5% 1 10% 39% 38% 6%	591
August	1st to 10th	Night	6% 1 7% 44% 35% 6%	537
	11th to 20th	Night	8% 1 12% 42% 34% 3	534
	21st to end	Night	7% 1 10% 39% 39% 5%	594
September	1st to 10th	Night	9% 2 13% 39% 34% 4	540
	11th to 20th	Night	11% 1 13% 40% 31% 5%	540
	21st to end	Night	10% 3 21% 37% 26% 3	614
October	1st to 10th	Night	9% 4 24% 36% 24% 4	720
	11th to 20th	Night	15% 10% 32% 32% 10% 1	720
	21st to end	Night	22% 11% 29% 29% 9%	792
November	1st to 10th	Night	14% 9% 34% 32% 11% 1	740
	11th to 20th	Night	18% 12% 31% 32% 8%	760
	21st to end	Night	22% 12% 29% 27% 10%	916
December	1st to 10th	Night	22% 15% 31% 26% 6%	950
	11th to 20th	Night	25% 13% 30% 28% 5%	950
	21st to end	Night	24% 19% 31% 23% 4	1045

Page generated at 2024-02-12 05:35:37. Version ac07

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