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 2024-11-30.

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 7% 5% 5% 5% 4 6% 8% 37%	101176
	Night	14% 7% 2 6% 4 4 4 3 5% 8% 44%	98490
Transparency	Day	41% 7% 12% 18% 16% 6%	104823
	Night	37% 6% 13% 19% 17% 8%	102984
Seeing	Day	13% 7% 19% 27% 23% 11%	14961
	Night	15% 5% 20% 31% 24% 4	24775

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	22% 8% 2 6% 4 3 3 3 4 6% 38%	2847
	11th to 20th	Day	16% 7% 2 5% 3 2 3 2 3 5% 51%	2850
	21st to end	Day	25% 8% 3 6% 3 3 3 3 5% 6% 34%	3135
February	1st to 10th	Day	22% 9% 3 6% 5% 5% 3 3 5% 5% 34%	1710
	11th to 20th	Day	23% 8% 3 7% 4 3 3 3 4 4 38%	1927
	21st to end	Day	24% 9% 3 6% 4 3 3 2 4 5% 37%	1727
March	1st to 10th	Day	23% 10% 3 7% 5% 4 5% 4 5% 6% 27%	3436
	11th to 20th	Day	18% 9% 3 8% 5% 5% 5% 5% 6% 8% 27%	3480
	21st to end	Day	18% 7% 3 7% 5% 4 4 3 4 5% 39%	3814
April	1st to 10th	Day	15% 8% 3 8% 4 6% 5% 4 5% 7% 36%	2149
	11th to 20th	Day	17% 7% 3 7% 5% 4 5% 4 6% 6% 35%	2254
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 7% 6% 42%	2280
May	1st to 10th	Day	17% 9% 3 9% 7% 6% 6% 4 6% 7% 27%	3765
	11th to 20th	Day	13% 6% 2 6% 4 4 4 4 5% 8% 43%	3883
	21st to end	Day	8% 6% 2 7% 6% 6% 7% 5% 8% 10% 33%	4477
June	1st to 10th	Day	6% 6% 2 9% 6% 7% 7% 6% 7% 11% 33%	2470
	11th to 20th	Day	5% 5% 2 7% 7% 7% 8% 6% 8% 10% 35%	2470
	21st to end	Day	6% 6% 3 9% 10% 8% 7% 7% 9% 11% 25%	2470
July	1st to 10th	Day	7% 6% 3 9% 7% 8% 8% 7% 9% 11% 25%	4120
	11th to 20th	Day	7% 8% 4 11% 8% 8% 7% 6% 9% 10% 21%	4120
	21st to end	Day	13% 9% 3 10% 7% 7% 7% 5% 7% 9% 23%	4465
August	1st to 10th	Day	2 2 1 4 4 5% 5% 6% 7% 10% 54%	4072
	11th to 20th	Day	4 3 1 5% 4 5% 7% 6% 8% 13% 45%	3729
	21st to end	Day	9% 6% 2 8% 7% 7% 7% 5% 7% 8% 34%	4180
September	1st to 10th	Day	9% 6% 3 9% 5% 6% 6% 6% 7% 9% 35%	2261
	11th to 20th	Day	14% 6% 3 7% 6% 6% 5% 5% 6% 7% 35%	2090
	21st to end	Day	10% 5% 3 6% 5% 4 5% 5% 6% 9% 44%	2071
October	1st to 10th	Day	7% 4 2 6% 5% 4 4 4 5% 6% 53%	1900
	11th to 20th	Day	9% 5% 2 6% 4 4 3 3 5% 8% 51%	1900
	21st to end	Day	12% 5% 2 6% 4 3 3 3 5% 6% 52%	2090
November	1st to 10th	Day	12% 5% 2 6% 4 6% 5% 4 4 6% 45%	1958
	11th to 20th	Day	12% 6% 3 6% 4 3 4 3 4 5% 49%	2000
	21st to end	Day	15% 9% 2 7% 4 4 3 3 4 6% 44%	1996
December	1st to 10th	Day	16% 7% 2 7% 4 4 4 3 5% 6% 40%	1784
	11th to 20th	Day	17% 8% 3 7% 5% 4 4 3 4 6% 39%	2161
	21st to end	Day	17% 7% 2 6% 3 3 4 3 5% 7% 42%	3135
January	1st to 10th	Night	17% 9% 3 6% 3 3 4 3 4 6% 42%	4108
	11th to 20th	Night	18% 8% 2 5% 3 3 2 2 3 4 49%	4120
	21st to end	Night	25% 8% 2 6% 4 3 3 2 5% 7% 34%	4532
February	1st to 10th	Night	19% 7% 3 7% 4 4 3 3 5% 6% 38%	2470
	11th to 20th	Night	22% 9% 3 5% 3 2 3 2 4 6% 41%	2154
	21st to end	Night	22% 10% 3 7% 4 4 3 2 5% 5% 36%	1727
March	1st to 10th	Night	25% 13% 3 7% 3 3 3 3 4 6% 28%	3419
	11th to 20th	Night	23% 10% 3 7% 5% 4 4 3 4 6% 31%	3480
	21st to end	Night	14% 7% 2 6% 4 5% 4 4 5% 6% 43%	3817
April	1st to 10th	Night	16% 7% 2 5% 5% 4 4 4 5% 8% 39%	2029
	11th to 20th	Night	17% 5% 2 5% 3 3 4 3 6% 8% 44%	1875
	21st to end	Night	13% 7% 2 5% 4 4 4 3 5% 7% 44%	1900
May	1st to 10th	Night	26% 10% 3 7% 4 4 4 4 5% 7% 26%	3130
	11th to 20th	Night	14% 7% 3 7% 4 4 4 3 5% 7% 42%	3009
	21st to end	Night	13% 7% 3 6% 4 4 5% 4 8% 10% 36%	3090
June	1st to 10th	Night	4 4 2 4 4 3 5% 4 8% 10% 53%	1710
	11th to 20th	Night	5% 4 1 5% 3 4 4 4 7% 13% 51%	1710
	21st to end	Night	6% 5% 2 6% 4 5% 6% 5% 9% 11% 42%	1710
July	1st to 10th	Night	5% 6% 2 7% 5% 4 5% 4 7% 13% 42%	2850
	11th to 20th	Night	4 4 2 7% 6% 6% 6% 5% 9% 11% 41%	2850
	21st to end	Night	8% 8% 2 8% 5% 5% 6% 4 6% 9% 37%	3098
August	1st to 10th	Night	2 2 1 2 2 3 3 4 6% 10% 65%	2863
	11th to 20th	Night	2 2 1 3 2 3 4 4 7% 12% 60%	3100
	21st to end	Night	7% 4 2 6% 4 6% 6% 5% 8% 10% 42%	3476
September	1st to 10th	Night	7% 5% 2 6% 4 4 4 5% 8% 10% 45%	1914
	11th to 20th	Night	11% 6% 3 6% 4 5% 5% 4 6% 9% 41%	2090
	21st to end	Night	8% 5% 1 5% 3 4 3 3 5% 7% 57%	2090
October	1st to 10th	Night	6% 3 1 4 4 3 4 3 6% 7% 58%	2280
	11th to 20th	Night	9% 4 1 4 3 3 3 3 5% 7% 58%	2280
	21st to end	Night	11% 5% 2 4 3 3 2 2 4 6% 60%	2508
November	1st to 10th	Night	10% 6% 1 5% 5% 3 4 3 5% 5% 51%	2340
	11th to 20th	Night	12% 5% 2 4 3 3 4 3 5% 6% 54%	2400
	21st to end	Night	13% 6% 3 8% 5% 4 3 3 5% 6% 45%	2400
December	1st to 10th	Night	18% 8% 2 5% 3 3 3 4 4 6% 42%	2393
	11th to 20th	Night	17% 9% 3 6% 4 4 3 3 4 6% 42%	3036
	21st to end	Night	18% 8% 3 6% 4 4 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	48% 4 4 16% 19% 9%	2848
	11th to 20th	Day	37% 4 6% 17% 27% 9%	2850
	21st to end	Day	50% 4 4 16% 16% 9%	3135
February	1st to 10th	Day	51% 4 7% 13% 16% 9%	1710
	11th to 20th	Day	49% 4 7% 14% 17% 9%	1938
	21st to end	Day	51% 5% 7% 13% 16% 8%	1727
March	1st to 10th	Day	55% 6% 10% 13% 12% 4	3436
	11th to 20th	Day	52% 7% 9% 14% 13% 5%	3480
	21st to end	Day	45% 4 9% 17% 22% 3	3814
April	1st to 10th	Day	46% 6% 9% 16% 15% 9%	2149
	11th to 20th	Day	45% 4 10% 16% 15% 9%	2254
	21st to end	Day	39% 7% 11% 16% 22% 5%	2280
May	1st to 10th	Day	54% 7% 12% 15% 9% 4	3800
	11th to 20th	Day	40% 5% 9% 20% 24% 3	3887
	21st to end	Day	40% 10% 15% 26% 9% 1	4489
June	1st to 10th	Day	40% 8% 17% 20% 13% 1	2470
	11th to 20th	Day	38% 8% 14% 24% 13% 2	2470
	21st to end	Day	44% 10% 19% 19% 7%	2470
July	1st to 10th	Day	45% 10% 26% 17% 2	4056
	11th to 20th	Day	52% 11% 20% 14% 3	4051
	21st to end	Day	52% 10% 18% 17% 2 1	4325
August	1st to 10th	Day	21% 8% 14% 36% 21%	4058
	11th to 20th	Day	27% 9% 32% 28% 3	3765
	21st to end	Day	45% 10% 13% 16% 15% 2	4179
September	1st to 10th	Day	42% 10% 15% 15% 13% 4	2261
	11th to 20th	Day	44% 8% 14% 16% 14% 4	2090
	21st to end	Day	36% 6% 12% 21% 16% 10%	2071
October	1st to 10th	Day	22% 4 7% 13% 17% 37%	3160
	11th to 20th	Day	20% 3 4 20% 34% 19%	3140
	21st to end	Day	26% 3 5% 12% 42% 12%	3428
November	1st to 10th	Day	37% 5% 10% 18% 19% 10%	1958
	11th to 20th	Day	35% 4 8% 17% 22% 14%	2000
	21st to end	Day	41% 4 7% 19% 20% 9%	1996
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% 5% 5% 16% 21% 9%	4108
	11th to 20th	Night	40% 3 4 17% 26% 9%	4120
	21st to end	Night	51% 3 5% 16% 16% 9%	4532
February	1st to 10th	Night	48% 4 7% 11% 19% 11%	2470
	11th to 20th	Night	45% 3 7% 16% 19% 10%	2154
	21st to end	Night	49% 4 8% 13% 13% 12%	1727
March	1st to 10th	Night	57% 4 9% 13% 12% 6%	3419
	11th to 20th	Night	54% 5% 10% 13% 14% 5%	3480
	21st to end	Night	40% 5% 12% 15% 23% 6%	3817
April	1st to 10th	Night	43% 5% 10% 17% 15% 9%	2029
	11th to 20th	Night	38% 4 13% 18% 15% 12%	1875
	21st to end	Night	38% 4 10% 21% 21% 6%	1900
May	1st to 10th	Night	56% 6% 11% 12% 10% 4	3160
	11th to 20th	Night	41% 5% 10% 18% 23% 3	3010
	21st to end	Night	38% 7% 21% 24% 9% 1	3099
June	1st to 10th	Night	25% 8% 21% 31% 15% 1	1710
	11th to 20th	Night	24% 8% 18% 32% 15% 2	1710
	21st to end	Night	32% 11% 23% 26% 8%	1710
July	1st to 10th	Night	33% 9% 37% 19% 2	2805
	11th to 20th	Night	33% 11% 31% 21% 4	2796
	21st to end	Night	41% 11% 23% 21% 4	2999
August	1st to 10th	Night	13% 6% 20% 42% 19%	2853
	11th to 20th	Night	15% 8% 37% 34% 6%	3130
	21st to end	Night	34% 13% 18% 20% 13% 1	3476
September	1st to 10th	Night	31% 9% 22% 22% 13% 4	1914
	11th to 20th	Night	38% 7% 17% 18% 15% 5%	2090
	21st to end	Night	28% 6% 12% 23% 18% 12%	2090
October	1st to 10th	Night	20% 3 7% 16% 17% 37%	3800
	11th to 20th	Night	16% 3 5% 24% 31% 21%	3779
	21st to end	Night	22% 3 5% 13% 41% 17%	4120
November	1st to 10th	Night	33% 6% 10% 19% 22% 11%	2340
	11th to 20th	Night	31% 4 9% 18% 25% 13%	2400
	21st to end	Night	40% 4 9% 18% 18% 11%	2400
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	16% 16% 37% 24% 7%	270
	21st to end	Day	22% 19% 34% 21% 5%	297
February	1st to 10th	Day	25% 17% 33% 19% 5%	270
	11th to 20th	Day	31% 14% 30% 22% 2	270
	21st to end	Day	27% 19% 40% 11% 3	225
March	1st to 10th	Day	25% 16% 33% 22% 4	270
	11th to 20th	Day	13% 19% 47% 16% 4 1	270
	21st to end	Day	21% 15% 35% 25% 4	297
April	1st to 10th	Day	18% 16% 34% 24% 7%	329
	11th to 20th	Day	20% 17% 26% 23% 13% 1	452
	21st to end	Day	16% 7% 32% 28% 16% 1	460
May	1st to 10th	Day	16% 13% 25% 30% 15% 1	463
	11th to 20th	Day	13% 4 21% 39% 21% 3	554
	21st to end	Day	8% 5% 23% 36% 22% 6%	734
June	1st to 10th	Day	9% 2 13% 32% 29% 14%	680
	11th to 20th	Day	7% 2 14% 35% 30% 12%	680
	21st to end	Day	9% 2 11% 28% 32% 17%	680
July	1st to 10th	Day	8% 2 6% 26% 35% 23%	671
	11th to 20th	Day	6% 2 6% 24% 36% 25%	668
	21st to end	Day	8% 2 4 26% 37% 23%	739
August	1st to 10th	Day	4 2 22% 45% 26%	657
	11th to 20th	Day	6% 3 11% 45% 35%	479
	21st to end	Day	12% 2 5% 19% 34% 27%	539
September	1st to 10th	Day	11% 2 5% 21% 37% 25%	471
	11th to 20th	Day	12% 3 9% 21% 35% 20%	300
	21st to end	Day	12% 2 9% 27% 38% 13%	300
October	1st to 10th	Day	9% 2 15% 41% 24% 9%	300
	11th to 20th	Day	9% 4 19% 36% 23% 9%	300
	21st to end	Day	16% 8% 23% 31% 17% 5%	330
November	1st to 10th	Day	17% 4 23% 32% 21% 3	300
	11th to 20th	Day	15% 6% 29% 38% 12% 1	300
	21st to end	Day	16% 20% 28% 24% 10% 2	299
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%	950
	21st to end	Night	23% 8% 29% 33% 7%	1045
February	1st to 10th	Night	22% 10% 32% 30% 5%	950
	11th to 20th	Night	27% 10% 26% 30% 7%	678
	21st to end	Night	24% 11% 34% 29% 3	471
March	1st to 10th	Night	24% 7% 31% 33% 6%	570
	11th to 20th	Night	19% 9% 30% 34% 8%	570
	21st to end	Night	19% 6% 32% 33% 10%	627
April	1st to 10th	Night	18% 8% 31% 35% 9%	570
	11th to 20th	Night	20% 9% 26% 32% 13%	563
	21st to end	Night	15% 7% 30% 36% 12% 1	570
May	1st to 10th	Night	15% 6% 25% 42% 11%	570
	11th to 20th	Night	12% 4 22% 40% 21% 1	561
	21st to end	Night	6% 4 20% 38% 28% 4	617
June	1st to 10th	Night	5% 2 6% 37% 44% 6%	570
	11th to 20th	Night	6% 2 6% 37% 43% 6%	570
	21st to end	Night	9% 2 6% 27% 44% 12%	570
July	1st to 10th	Night	6% 2 3 23% 52% 14%	555
	11th to 20th	Night	4 1 3 19% 52% 22%	552
	21st to end	Night	4 1 3 25% 51% 17%	624
August	1st to 10th	Night	2 1 2 18% 61% 16%	567
	11th to 20th	Night	4 1 16% 59% 20%	564
	21st to end	Night	9% 2 4 19% 52% 15%	627
September	1st to 10th	Night	7% 2 5% 22% 50% 14%	570
	11th to 20th	Night	13% 2 6% 22% 49% 9%	570
	21st to end	Night	9% 1 6% 31% 44% 8%	570
October	1st to 10th	Night	6% 2 10% 34% 42% 6%	760
	11th to 20th	Night	10% 3 17% 39% 28% 3	760
	21st to end	Night	12% 6% 19% 37% 23% 3	836
November	1st to 10th	Night	12% 4 20% 36% 25% 3	780
	11th to 20th	Night	13% 7% 23% 40% 17%	800
	21st to end	Night	16% 7% 30% 31% 15% 1	800
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

Page generated at 2024-11-27 16:30:50. Version ac07

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