Claiborne West Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Claiborne West Park clear sky chart from 2005-11-06 to 2024-01-15.

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% 6% 3 6% 6% 4 6% 6% 6% 8% 38%	75020
	Night	13% 6% 2 5% 4 3 4 4 5% 8% 46%	74775
Transparency	Day	41% 7% 13% 18% 15% 6%	74746
	Night	36% 6% 13% 19% 17% 8%	74570
Seeing	Day	13% 6% 19% 27% 24% 12%	13758
	Night	15% 5% 20% 31% 24% 4	23691

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	20% 6% 2 5% 5% 2 4 4 5% 6% 41%	1707
	11th to 20th	Day	17% 6% 3 5% 5% 2 4 4 4 6% 45%	1656
	21st to end	Day	20% 8% 3 4 4 3 3 4 4 5% 41%	1782
February	1st to 10th	Day	22% 8% 4 5% 5% 3 4 4 5% 5% 35%	1620
	11th to 20th	Day	23% 8% 3 6% 4 3 4 4 4 4 37%	1823
	21st to end	Day	25% 9% 3 6% 5% 2 3 3 4 5% 36%	1628
March	1st to 10th	Day	22% 8% 2 6% 5% 2 4 4 4 7% 36%	1980
	11th to 20th	Day	17% 8% 3 7% 5% 3 4 4 5% 7% 37%	1980
	21st to end	Day	15% 6% 4 6% 5% 3 5% 4 5% 6% 42%	2178
April	1st to 10th	Day	14% 7% 3 7% 5% 4 5% 5% 5% 8% 37%	2035
	11th to 20th	Day	17% 7% 3 6% 6% 3 5% 4 5% 7% 36%	2134
	21st to end	Day	11% 6% 3 6% 6% 3 5% 5% 6% 6% 42%	2160
May	1st to 10th	Day	12% 6% 3 6% 6% 3 6% 5% 7% 8% 37%	2160
	11th to 20th	Day	10% 5% 3 6% 6% 3 5% 6% 7% 9% 41%	2187
	21st to end	Day	9% 5% 3 7% 8% 4 8% 7% 7% 11% 31%	2531
June	1st to 10th	Day	6% 6% 3 8% 7% 6% 7% 8% 7% 11% 33%	2340
	11th to 20th	Day	5% 4 3 6% 7% 6% 8% 8% 8% 10% 35%	2340
	21st to end	Day	7% 6% 3 8% 10% 6% 9% 8% 8% 11% 24%	2340
July	1st to 10th	Day	9% 5% 4 7% 8% 6% 8% 8% 9% 11% 26%	2340
	11th to 20th	Day	8% 5% 3 6% 8% 5% 7% 9% 9% 12% 29%	2340
	21st to end	Day	7% 5% 2 7% 8% 5% 9% 9% 8% 10% 30%	2546
August	1st to 10th	Day	3 3 2 5% 7% 5% 9% 10% 10% 13% 33%	2310
	11th to 20th	Day	6% 4 2 5% 8% 5% 9% 9% 8% 11% 32%	2125
	21st to end	Day	10% 6% 3 6% 8% 5% 7% 8% 7% 10% 31%	2376
September	1st to 10th	Day	8% 6% 3 8% 7% 4 7% 7% 7% 9% 35%	2142
	11th to 20th	Day	14% 6% 3 6% 7% 4 6% 6% 6% 7% 34%	1980
	21st to end	Day	11% 5% 3 5% 6% 3 5% 6% 5% 9% 42%	1962
October	1st to 10th	Day	7% 4 2 5% 6% 3 4 5% 5% 7% 52%	1800
	11th to 20th	Day	10% 5% 2 5% 4 3 4 4 5% 8% 50%	1800
	21st to end	Day	12% 4 2 5% 5% 2 3 3 4 6% 52%	1980
November	1st to 10th	Day	11% 5% 2 5% 5% 4 6% 5% 4 6% 48%	1858
	11th to 20th	Day	12% 6% 3 6% 5% 2 4 4 4 6% 49%	1900
	21st to end	Day	16% 9% 2 6% 5% 3 3 3 4 6% 43%	1900
December	1st to 10th	Day	16% 7% 3 6% 5% 3 5% 4 5% 6% 41%	1784
	11th to 20th	Day	17% 7% 3 6% 6% 3 4 4 4 6% 39%	2161
	21st to end	Day	17% 7% 2 5% 4 3 3 4 5% 7% 42%	3135
January	1st to 10th	Night	19% 7% 3 6% 4 2 3 4 4 7% 42%	2458
	11th to 20th	Night	19% 7% 2 5% 4 3 3 3 3 5% 47%	2393
	21st to end	Night	19% 6% 3 6% 6% 3 3 3 4 5% 42%	2574
February	1st to 10th	Night	20% 7% 3 6% 4 3 4 3 5% 6% 39%	2340
	11th to 20th	Night	22% 9% 3 5% 4 1 2 3 4 7% 41%	2037
	21st to end	Night	22% 9% 3 6% 4 3 4 3 5% 6% 35%	1628
March	1st to 10th	Night	20% 9% 3 4 4 3 3 3 5% 6% 39%	1980
	11th to 20th	Night	17% 8% 4 5% 5% 3 4 4 5% 7% 39%	1980
	21st to end	Night	16% 7% 3 5% 3 2 3 4 4 7% 46%	2178
April	1st to 10th	Night	16% 6% 3 5% 5% 3 5% 5% 5% 8% 39%	1923
	11th to 20th	Night	17% 5% 2 5% 3 2 4 3 6% 8% 45%	1775
	21st to end	Night	12% 7% 3 4 5% 3 4 5% 5% 8% 45%	1800
May	1st to 10th	Night	13% 8% 3 5% 5% 3 4 4 5% 9% 41%	1800
	11th to 20th	Night	9% 6% 2 5% 4 3 3 4 6% 9% 49%	1701
	21st to end	Night	7% 4 2 4 4 2 5% 6% 8% 10% 47%	1745
June	1st to 10th	Night	4 4 2 4 4 3 4 5% 7% 10% 53%	1620
	11th to 20th	Night	4 3 2 4 3 3 4 5% 7% 13% 51%	1620
	21st to end	Night	6% 5% 3 5% 5% 3 6% 6% 8% 11% 41%	1620
July	1st to 10th	Night	5% 5% 3 5% 5% 3 6% 6% 8% 13% 42%	1620
	11th to 20th	Night	4 3 2 4 5% 2 4 4 7% 13% 52%	1620
	21st to end	Night	4 3 2 4 4 3 5% 6% 8% 12% 49%	1772
August	1st to 10th	Night	2 1 1 2 3 2 4 5% 7% 12% 61%	1625
	11th to 20th	Night	3 3 2 4 5% 4 5% 7% 9% 12% 47%	1776
	21st to end	Night	8% 3 2 5% 5% 4 6% 6% 7% 11% 43%	1980
September	1st to 10th	Night	6% 4 2 5% 5% 3 5% 5% 8% 10% 47%	1813
	11th to 20th	Night	11% 5% 3 5% 5% 4 5% 6% 6% 9% 41%	1980
	21st to end	Night	8% 5% 2 4 4 2 4 3 5% 7% 56%	1980
October	1st to 10th	Night	6% 3 2 4 5% 3 4 4 6% 7% 57%	2160
	11th to 20th	Night	10% 4 2 3 4 2 3 4 5% 7% 56%	2160
	21st to end	Night	11% 5% 2 3 3 2 2 2 3 6% 59%	2376
November	1st to 10th	Night	9% 5% 2 4 5% 2 4 4 5% 6% 54%	2220
	11th to 20th	Night	12% 5% 2 4 4 2 4 4 5% 6% 53%	2280
	21st to end	Night	14% 6% 3 7% 6% 3 4 3 5% 6% 45%	2280
December	1st to 10th	Night	18% 8% 3 5% 4 3 4 4 4 6% 42%	2393
	11th to 20th	Night	17% 8% 3 5% 5% 3 4 3 4 6% 42%	3036
	21st to end	Night	18% 8% 3 5% 4 3 4 4 5% 5% 41%	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	43% 5% 6% 18% 19% 9%	1708
	11th to 20th	Day	40% 5% 6% 17% 22% 10%	1656
	21st to end	Day	44% 5% 5% 16% 17% 12%	1782
February	1st to 10th	Day	51% 4 7% 13% 16% 9%	1620
	11th to 20th	Day	49% 5% 7% 13% 17% 9%	1834
	21st to end	Day	52% 5% 7% 12% 16% 8%	1628
March	1st to 10th	Day	48% 4 9% 15% 17% 7%	1980
	11th to 20th	Day	46% 5% 8% 12% 20% 8%	1980
	21st to end	Day	41% 5% 10% 17% 21% 6%	2178
April	1st to 10th	Day	45% 6% 9% 16% 16% 8%	2035
	11th to 20th	Day	46% 4 10% 16% 14% 10%	2134
	21st to end	Day	39% 7% 11% 15% 22% 5%	2160
May	1st to 10th	Day	41% 6% 13% 17% 16% 7%	2160
	11th to 20th	Day	37% 5% 14% 26% 16% 3	2191
	21st to end	Day	42% 8% 16% 22% 11% 1	2531
June	1st to 10th	Day	40% 8% 18% 20% 13% 1	2340
	11th to 20th	Day	38% 9% 15% 24% 13% 2	2340
	21st to end	Day	46% 10% 19% 18% 7%	2340
July	1st to 10th	Day	43% 11% 23% 20% 4	2276
	11th to 20th	Day	41% 12% 25% 18% 5%	2271
	21st to end	Day	39% 12% 23% 21% 4 1	2405
August	1st to 10th	Day	33% 11% 22% 26% 8%	2296
	11th to 20th	Day	40% 12% 21% 21% 5% 1	2125
	21st to end	Day	43% 11% 18% 18% 8% 2	2376
September	1st to 10th	Day	41% 10% 16% 16% 13% 4	2142
	11th to 20th	Day	45% 8% 14% 16% 13% 4	1980
	21st to end	Day	37% 6% 13% 21% 16% 8%	1962
October	1st to 10th	Day	29% 6% 12% 20% 22% 12%	1800
	11th to 20th	Day	32% 5% 7% 19% 24% 14%	1800
	21st to end	Day	32% 3 8% 15% 25% 16%	1980
November	1st to 10th	Day	35% 5% 10% 19% 20% 11%	1858
	11th to 20th	Day	36% 4 8% 18% 22% 12%	1900
	21st to end	Day	43% 4 7% 19% 19% 8%	1900
December	1st to 10th	Day	43% 4 10% 19% 15% 8%	1784
	11th to 20th	Day	45% 5% 6% 15% 19% 10%	2159
	21st to end	Day	42% 5% 7% 15% 24% 8%	3135
January	1st to 10th	Night	43% 4 6% 15% 23% 10%	2458
	11th to 20th	Night	42% 3 5% 17% 21% 11%	2393
	21st to end	Night	45% 4 5% 15% 18% 12%	2574
February	1st to 10th	Night	47% 4 7% 11% 19% 11%	2340
	11th to 20th	Night	45% 3 7% 16% 19% 9%	2037
	21st to end	Night	50% 4 8% 13% 12% 12%	1628
March	1st to 10th	Night	45% 3 10% 15% 17% 10%	1980
	11th to 20th	Night	45% 6% 10% 12% 19% 8%	1980
	21st to end	Night	38% 5% 12% 16% 21% 7%	2178
April	1st to 10th	Night	43% 5% 10% 18% 15% 9%	1923
	11th to 20th	Night	37% 4 13% 18% 16% 12%	1775
	21st to end	Night	37% 4 10% 21% 21% 6%	1800
May	1st to 10th	Night	40% 6% 13% 16% 17% 8%	1800
	11th to 20th	Night	33% 6% 12% 25% 21% 4	1702
	21st to end	Night	30% 8% 18% 29% 14% 2	1746
June	1st to 10th	Night	25% 8% 21% 31% 14% 1	1620
	11th to 20th	Night	24% 8% 19% 33% 15% 2	1620
	21st to end	Night	33% 11% 22% 25% 8%	1620
July	1st to 10th	Night	32% 9% 29% 25% 4	1575
	11th to 20th	Night	23% 11% 36% 25% 6%	1566
	21st to end	Night	25% 10% 32% 26% 6%	1673
August	1st to 10th	Night	15% 8% 33% 35% 8%	1615
	11th to 20th	Night	25% 12% 29% 26% 6% 1	1776
	21st to end	Night	34% 11% 24% 21% 9% 2	1980
September	1st to 10th	Night	30% 8% 23% 23% 13% 4	1813
	11th to 20th	Night	39% 7% 18% 18% 14% 4	1980
	21st to end	Night	29% 6% 13% 23% 18% 10%	1980
October	1st to 10th	Night	27% 5% 11% 24% 20% 14%	2160
	11th to 20th	Night	27% 5% 8% 22% 23% 14%	2160
	21st to end	Night	29% 3 7% 16% 26% 18%	2376
November	1st to 10th	Night	31% 5% 10% 20% 23% 11%	2220
	11th to 20th	Night	32% 4 9% 19% 25% 11%	2280
	21st to end	Night	40% 4 9% 18% 18% 11%	2280
December	1st to 10th	Night	43% 4 10% 20% 15% 9%	2393
	11th to 20th	Night	44% 3 6% 12% 20% 14%	3037
	21st to end	Night	44% 5% 7% 13% 23% 8%	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	24% 10% 37% 19% 9% 1	270
	11th to 20th	Day	15% 15% 37% 26% 7%	252
	21st to end	Day	20% 19% 36% 20% 5%	264
February	1st to 10th	Day	25% 14% 34% 21% 6%	240
	11th to 20th	Day	31% 15% 30% 21% 3	240
	21st to end	Day	28% 17% 40% 11% 3	198
March	1st to 10th	Day	25% 15% 35% 21% 4	240
	11th to 20th	Day	14% 18% 46% 17% 5% 1	240
	21st to end	Day	20% 16% 33% 26% 5%	264
April	1st to 10th	Day	16% 15% 35% 26% 8%	295
	11th to 20th	Day	21% 15% 26% 24% 14% 1	412
	21st to end	Day	16% 7% 32% 29% 16% 1	420
May	1st to 10th	Day	15% 11% 24% 33% 16% 1	423
	11th to 20th	Day	12% 3 19% 40% 22% 4	510
	21st to end	Day	9% 4 21% 37% 23% 6%	679
June	1st to 10th	Day	9% 2 12% 33% 30% 15%	630
	11th to 20th	Day	6% 2 13% 34% 32% 13%	630
	21st to end	Day	9% 2 11% 28% 33% 17%	630
July	1st to 10th	Day	7% 2 6% 26% 36% 23%	621
	11th to 20th	Day	6% 2 5% 23% 37% 26%	618
	21st to end	Day	6% 1 4 26% 37% 25%	684
August	1st to 10th	Day	4 3 22% 44% 27%	608
	11th to 20th	Day	7% 3 10% 46% 35%	439
	21st to end	Day	12% 2 5% 18% 34% 29%	495
September	1st to 10th	Day	9% 2 4 20% 40% 27%	432
	11th to 20th	Day	12% 2 9% 20% 36% 21%	270
	21st to end	Day	14% 2 7% 26% 39% 13%	270
October	1st to 10th	Day	9% 2 13% 40% 26% 10%	270
	11th to 20th	Day	10% 4 17% 34% 24% 10%	270
	21st to end	Day	17% 9% 24% 30% 16% 4	297
November	1st to 10th	Day	14% 4 21% 35% 23% 3	270
	11th to 20th	Day	15% 7% 29% 36% 12% 1	270
	21st to end	Day	18% 19% 28% 25% 9% 2	270
December	1st to 10th	Day	18% 9% 29% 27% 12% 5%	270
	11th to 20th	Day	20% 11% 37% 26% 5% 1	270
	21st to end	Day	20% 15% 34% 22% 7% 2	297
January	1st to 10th	Night	22% 8% 31% 31% 8%	950
	11th to 20th	Night	21% 7% 32% 31% 8%	921
	21st to end	Night	23% 8% 29% 33% 7%	990
February	1st to 10th	Night	22% 10% 33% 31% 5%	900
	11th to 20th	Night	27% 10% 26% 30% 7%	641
	21st to end	Night	25% 10% 33% 30% 3	444
March	1st to 10th	Night	23% 6% 31% 33% 7%	540
	11th to 20th	Night	19% 9% 30% 33% 9%	540
	21st to end	Night	19% 5% 30% 34% 11%	594
April	1st to 10th	Night	18% 7% 31% 36% 9%	540
	11th to 20th	Night	19% 8% 26% 32% 14%	533
	21st to end	Night	14% 6% 31% 36% 12% 1	540
May	1st to 10th	Night	14% 6% 26% 42% 12%	540
	11th to 20th	Night	12% 3 22% 40% 21% 1	531
	21st to end	Night	6% 3 17% 40% 29% 4	584
June	1st to 10th	Night	5% 2 5% 37% 45% 6%	540
	11th to 20th	Night	5% 2 6% 37% 43% 6%	540
	21st to end	Night	9% 1 6% 27% 45% 12%	540
July	1st to 10th	Night	6% 2 2 23% 52% 15%	525
	11th to 20th	Night	4 1 2 19% 52% 22%	522
	21st to end	Night	4 1 2 25% 51% 17%	591
August	1st to 10th	Night	2 1 2 18% 61% 17%	537
	11th to 20th	Night	4 1 15% 59% 20%	534
	21st to end	Night	9% 2 4 18% 52% 16%	594
September	1st to 10th	Night	6% 1 4 22% 51% 14%	540
	11th to 20th	Night	13% 1 5% 21% 50% 9%	540
	21st to end	Night	10% 1 6% 30% 45% 9%	540
October	1st to 10th	Night	6% 2 10% 33% 43% 6%	720
	11th to 20th	Night	11% 3 18% 37% 29% 3	720
	21st to end	Night	13% 6% 19% 37% 23% 3	792
November	1st to 10th	Night	11% 3 19% 38% 26% 3	740
	11th to 20th	Night	14% 7% 22% 40% 17%	760
	21st to end	Night	17% 7% 29% 31% 15% 1	760
December	1st to 10th	Night	21% 7% 26% 31% 14%	873
	11th to 20th	Night	23% 7% 29% 32% 9%	950
	21st to end	Night	21% 9% 30% 31% 9%	1045

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