Capon Springs and Farms
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Capon Springs and Farms clear sky chart from 2005-11-06 to 2026-09-29.

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	12% 6% 2 6% 5% 5% 5% 4 6% 8% 39%	148998
	Night	12% 6% 2 6% 4 4 5% 4 6% 8% 41%	142390
Transparency	Day	39% 7% 12% 23% 16% 3	152600
	Night	38% 7% 12% 24% 17% 3	146859
Seeing	Day	21% 16% 26% 21% 12% 4	17383
	Night	18% 15% 25% 29% 12% 1	26977

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	12% 6% 3 8% 5% 5% 5% 4 6% 6% 42%	5117
	11th to 20th	Day	10% 9% 3 7% 5% 5% 4 3 5% 5% 45%	5280
	21st to end	Day	12% 5% 2 7% 6% 6% 6% 5% 6% 6% 40%	5780
February	1st to 10th	Day	11% 10% 3 8% 6% 3 5% 3 6% 6% 39%	1890
	11th to 20th	Day	15% 9% 4 7% 5% 4 5% 4 4 6% 38%	1843
	21st to end	Day	14% 8% 3 7% 5% 4 4 3 5% 6% 40%	1760
March	1st to 10th	Day	15% 7% 2 7% 5% 4 4 3 4 6% 41%	5045
	11th to 20th	Day	9% 6% 2 6% 4 4 4 4 6% 7% 49%	5090
	21st to end	Day	13% 8% 2 8% 4 4 5% 4 6% 7% 38%	5586
April	1st to 10th	Day	11% 8% 3 6% 4 6% 5% 5% 6% 7% 39%	2491
	11th to 20th	Day	12% 6% 2 6% 4 5% 5% 3 6% 7% 44%	2494
	21st to end	Day	16% 7% 2 6% 4 4 5% 4 6% 6% 40%	2588
May	1st to 10th	Day	14% 6% 3 7% 5% 6% 6% 5% 7% 9% 32%	7616
	11th to 20th	Day	18% 6% 2 6% 4 5% 5% 4 7% 9% 33%	7662
	21st to end	Day	21% 6% 2 6% 4 4 5% 4 6% 7% 36%	9045
June	1st to 10th	Day	11% 6% 2 5% 5% 5% 5% 5% 6% 9% 42%	2940
	11th to 20th	Day	10% 6% 2 6% 4 6% 5% 6% 8% 9% 37%	2940
	21st to end	Day	9% 5% 1 5% 5% 5% 6% 4 7% 9% 43%	2940
July	1st to 10th	Day	8% 6% 2 7% 5% 5% 5% 5% 6% 9% 42%	8222
	11th to 20th	Day	7% 6% 2 7% 5% 6% 6% 6% 9% 12% 33%	7680
	21st to end	Day	7% 6% 2 6% 5% 5% 6% 5% 8% 10% 38%	8340
August	1st to 10th	Day	14% 6% 3 8% 6% 7% 7% 5% 8% 9% 28%	6014
	11th to 20th	Day	9% 5% 2 7% 5% 6% 6% 6% 8% 9% 35%	5886
	21st to end	Day	8% 4 1 5% 4 5% 5% 4 7% 9% 47%	6080
September	1st to 10th	Day	13% 6% 2 6% 3 4 4 4 6% 6% 45%	2520
	11th to 20th	Day	13% 6% 2 6% 4 4 4 4 6% 7% 45%	2444
	21st to end	Day	22% 7% 2 6% 5% 5% 4 3 5% 6% 36%	2211
October	1st to 10th	Day	15% 5% 2 5% 3 3 4 4 5% 6% 46%	2000
	11th to 20th	Day	15% 5% 2 5% 4 4 4 3 5% 6% 48%	2000
	21st to end	Day	13% 5% 2 6% 4 4 3 3 6% 6% 48%	2200
November	1st to 10th	Day	10% 5% 2 5% 3 4 5% 3 5% 6% 52%	2052
	11th to 20th	Day	13% 7% 2 4 5% 4 5% 4 5% 7% 45%	1764
	21st to end	Day	13% 6% 2 5% 4 4 6% 4 5% 7% 44%	1680
December	1st to 10th	Day	11% 6% 2 5% 3 4 5% 3 6% 7% 48%	2680
	11th to 20th	Day	17% 8% 3 5% 4 4 5% 4 5% 6% 39%	3070
	21st to end	Day	15% 7% 3 7% 6% 5% 6% 4 7% 8% 32%	4048
January	1st to 10th	Night	8% 7% 2 6% 6% 5% 5% 5% 7% 8% 40%	7771
	11th to 20th	Night	10% 8% 3 6% 3 4 4 4 5% 6% 47%	7680
	21st to end	Night	11% 6% 2 5% 3 4 5% 4 7% 6% 46%	8401
February	1st to 10th	Night	12% 8% 3 6% 5% 4 5% 5% 6% 6% 41%	2730
	11th to 20th	Night	15% 9% 3 6% 5% 4 5% 4 5% 6% 38%	2663
	21st to end	Night	13% 9% 3 7% 4 4 5% 4 5% 7% 39%	2042
March	1st to 10th	Night	15% 6% 2 6% 4 3 4 3 5% 7% 46%	5028
	11th to 20th	Night	8% 5% 2 6% 4 4 4 4 5% 9% 49%	5090
	21st to end	Night	9% 6% 3 6% 5% 5% 5% 4 6% 7% 45%	5588
April	1st to 10th	Night	14% 7% 2 7% 5% 4 5% 4 5% 7% 39%	2127
	11th to 20th	Night	12% 6% 2 6% 5% 4 5% 4 6% 8% 42%	2075
	21st to end	Night	15% 6% 2 4 4 4 5% 4 5% 7% 44%	2048
May	1st to 10th	Night	16% 7% 3 7% 5% 5% 5% 4 6% 8% 34%	5237
	11th to 20th	Night	20% 6% 2 5% 4 5% 5% 4 6% 8% 35%	5182
	21st to end	Night	21% 7% 3 6% 5% 4 5% 4 5% 7% 33%	5108
June	1st to 10th	Night	10% 5% 2 5% 4 4 5% 4 6% 9% 46%	1680
	11th to 20th	Night	11% 6% 2 6% 4 5% 4 5% 6% 9% 42%	1680
	21st to end	Night	8% 6% 2 5% 5% 4 5% 4 8% 11% 43%	1680
July	1st to 10th	Night	8% 6% 2 7% 4 5% 6% 5% 6% 9% 41%	4730
	11th to 20th	Night	8% 7% 3 9% 6% 7% 7% 5% 8% 9% 32%	5277
	21st to end	Night	7% 6% 2 8% 5% 5% 6% 5% 8% 9% 38%	5736
August	1st to 10th	Night	12% 6% 3 9% 6% 5% 6% 5% 8% 9% 29%	4135
	11th to 20th	Night	9% 6% 3 7% 6% 5% 6% 4 7% 9% 37%	4113
	21st to end	Night	11% 5% 2 6% 4 4 5% 4 6% 9% 44%	5045
September	1st to 10th	Night	13% 5% 2 5% 3 5% 4 4 5% 7% 46%	2100
	11th to 20th	Night	13% 6% 2 5% 4 3 2 3 5% 8% 49%	2172
	21st to end	Night	21% 5% 2 6% 4 4 4 3 4 6% 40%	2364
October	1st to 10th	Night	18% 5% 2 5% 3 3 3 3 4 6% 48%	2400
	11th to 20th	Night	14% 4 2 4 4 3 4 3 5% 7% 52%	2400
	21st to end	Night	14% 4 1 4 3 4 4 3 5% 8% 50%	2640
November	1st to 10th	Night	10% 6% 2 5% 3 4 3 3 5% 7% 52%	2462
	11th to 20th	Night	13% 7% 2 4 4 3 4 3 6% 7% 46%	2851
	21st to end	Night	12% 5% 2 6% 5% 5% 5% 4 6% 6% 43%	2940
December	1st to 10th	Night	9% 4 2 6% 3 4 4 4 6% 9% 49%	4720
	11th to 20th	Night	16% 7% 2 6% 5% 5% 5% 4 5% 7% 38%	5345
	21st to end	Night	13% 7% 3 7% 5% 5% 6% 5% 7% 9% 32%	7150

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	40% 5% 8% 23% 18% 5%	5118
	11th to 20th	Day	39% 5% 7% 19% 20% 11%	5280
	21st to end	Day	40% 5% 10% 29% 12% 3	5780
February	1st to 10th	Day	44% 5% 13% 21% 14% 3	1890
	11th to 20th	Day	46% 7% 9% 20% 16% 2	1852
	21st to end	Day	44% 5% 12% 21% 15% 4	1760
March	1st to 10th	Day	43% 4 9% 21% 15% 8%	5045
	11th to 20th	Day	33% 5% 10% 26% 19% 6%	5090
	21st to end	Day	43% 7% 10% 18% 17% 6%	5586
April	1st to 10th	Day	41% 7% 11% 19% 17% 4	2491
	11th to 20th	Day	37% 5% 11% 22% 19% 5%	2494
	21st to end	Day	43% 6% 10% 24% 14% 3	2588
May	1st to 10th	Day	45% 8% 12% 20% 12% 2	7651
	11th to 20th	Day	44% 8% 11% 26% 10% 1	7666
	21st to end	Day	45% 8% 10% 18% 16% 3	9061
June	1st to 10th	Day	37% 8% 13% 23% 18% 1	2940
	11th to 20th	Day	38% 11% 13% 22% 13% 1	2940
	21st to end	Day	35% 9% 14% 25% 15% 2	2940
July	1st to 10th	Day	37% 10% 13% 22% 14% 3	8152
	11th to 20th	Day	38% 10% 14% 28% 9% 1	7611
	21st to end	Day	36% 9% 11% 23% 20% 1	8156
August	1st to 10th	Day	48% 11% 15% 19% 7%	6001
	11th to 20th	Day	40% 9% 15% 24% 12%	5925
	21st to end	Day	31% 8% 17% 27% 16% 1	6080
September	1st to 10th	Day	37% 8% 12% 20% 20% 4	2520
	11th to 20th	Day	36% 7% 8% 27% 18% 3	2444
	21st to end	Day	49% 5% 9% 19% 16% 2	2211
October	1st to 10th	Day	32% 6% 8% 21% 27% 5%	3260
	11th to 20th	Day	26% 5% 9% 29% 22% 10%	3240
	21st to end	Day	25% 4 10% 30% 27% 5%	3538
November	1st to 10th	Day	32% 6% 11% 24% 24% 4	2052
	11th to 20th	Day	38% 5% 10% 20% 23% 4	1764
	21st to end	Day	39% 6% 12% 25% 16% 2	1680
December	1st to 10th	Day	34% 6% 13% 26% 16% 4	2680
	11th to 20th	Day	45% 6% 12% 24% 12% 3	3066
	21st to end	Day	44% 8% 16% 18% 13% 1	4048
January	1st to 10th	Night	36% 6% 10% 25% 19% 3	7772
	11th to 20th	Night	36% 4 8% 23% 21% 8%	7680
	21st to end	Night	35% 5% 9% 30% 18% 3	8401
February	1st to 10th	Night	41% 6% 12% 25% 14% 1	2730
	11th to 20th	Night	44% 7% 9% 22% 14% 3	2665
	21st to end	Night	44% 5% 12% 20% 14% 5%	2042
March	1st to 10th	Night	37% 5% 9% 26% 15% 8%	5028
	11th to 20th	Night	31% 6% 13% 28% 18% 5%	5090
	21st to end	Night	36% 7% 12% 23% 18% 4	5588
April	1st to 10th	Night	43% 7% 9% 21% 17% 3	2127
	11th to 20th	Night	38% 7% 12% 23% 17% 5%	2075
	21st to end	Night	38% 7% 11% 27% 14% 3	2048
May	1st to 10th	Night	46% 8% 12% 20% 11% 3	5264
	11th to 20th	Night	43% 7% 15% 25% 10% 1	5183
	21st to end	Night	49% 7% 12% 18% 10% 3	5115
June	1st to 10th	Night	34% 9% 11% 28% 16% 2	1680
	11th to 20th	Night	37% 8% 15% 25% 13% 1	1680
	21st to end	Night	33% 8% 16% 24% 17% 1	1680
July	1st to 10th	Night	38% 10% 16% 19% 14% 2	4692
	11th to 20th	Night	44% 12% 14% 20% 10% 1	5226
	21st to end	Night	35% 10% 15% 22% 18% 1	5606
August	1st to 10th	Night	47% 11% 14% 21% 7%	4124
	11th to 20th	Night	40% 9% 17% 20% 14%	4140
	21st to end	Night	34% 7% 17% 27% 13% 1	5045
September	1st to 10th	Night	36% 7% 13% 21% 19% 4	2100
	11th to 20th	Night	35% 4 10% 29% 21% 2	2172
	21st to end	Night	45% 7% 9% 21% 17% 2	2364
October	1st to 10th	Night	36% 5% 10% 24% 23% 3	3920
	11th to 20th	Night	23% 5% 11% 23% 30% 7%	3899
	21st to end	Night	23% 4 10% 31% 27% 5%	4252
November	1st to 10th	Night	31% 6% 11% 25% 22% 5%	2462
	11th to 20th	Night	36% 6% 9% 25% 20% 5%	2851
	21st to end	Night	38% 6% 12% 23% 18% 3	2940
December	1st to 10th	Night	31% 6% 13% 30% 18% 2	4720
	11th to 20th	Night	44% 5% 12% 19% 16% 3	5348
	21st to end	Night	43% 8% 15% 19% 14% 1	7150

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% 30% 23% 10% 3	303
	11th to 20th	Day	32% 30% 25% 11% 3	330
	21st to end	Day	29% 28% 31% 10% 2	363
February	1st to 10th	Day	31% 29% 29% 9% 2	330
	11th to 20th	Day	45% 28% 24% 2 1	330
	21st to end	Day	31% 24% 30% 14% 1	420
March	1st to 10th	Day	29% 26% 24% 19% 3	540
	11th to 20th	Day	27% 29% 23% 14% 6% 1	540
	21st to end	Day	25% 26% 29% 14% 4 1	594
April	1st to 10th	Day	24% 26% 25% 18% 7%	540
	11th to 20th	Day	22% 20% 30% 17% 9% 3	532
	21st to end	Day	25% 18% 30% 18% 8% 1	540
May	1st to 10th	Day	23% 22% 27% 16% 9% 3	543
	11th to 20th	Day	22% 18% 28% 17% 11% 3	567
	21st to end	Day	21% 14% 23% 23% 15% 4	617
June	1st to 10th	Day	16% 11% 28% 25% 15% 5%	570
	11th to 20th	Day	16% 13% 26% 23% 17% 5%	570
	21st to end	Day	12% 8% 30% 29% 15% 6%	570
July	1st to 10th	Day	10% 5% 20% 30% 25% 10%	565
	11th to 20th	Day	5% 4 26% 31% 23% 10%	564
	21st to end	Day	12% 8% 21% 32% 18% 9%	620
August	1st to 10th	Day	14% 6% 21% 27% 22% 10%	566
	11th to 20th	Day	13% 5% 22% 30% 21% 9%	559
	21st to end	Day	10% 7% 22% 28% 21% 11%	627
September	1st to 10th	Day	15% 10% 20% 25% 22% 8%	570
	11th to 20th	Day	15% 5% 20% 29% 21% 9%	570
	21st to end	Day	30% 10% 22% 21% 14% 4	562
October	1st to 10th	Day	19% 7% 22% 28% 19% 5%	530
	11th to 20th	Day	19% 18% 25% 23% 12% 3	530
	21st to end	Day	18% 18% 34% 20% 8% 2	583
November	1st to 10th	Day	17% 18% 31% 22% 9% 3	532
	11th to 20th	Day	22% 21% 34% 15% 6% 1	304
	21st to end	Day	27% 20% 35% 15% 3	220
December	1st to 10th	Day	24% 29% 30% 12% 4	220
	11th to 20th	Day	27% 23% 28% 17% 4	220
	21st to end	Day	24% 20% 31% 19% 5%	242
January	1st to 10th	Night	20% 24% 34% 19% 3	840
	11th to 20th	Night	23% 22% 28% 23% 4	840
	21st to end	Night	19% 23% 36% 20% 2	924
February	1st to 10th	Night	18% 24% 30% 26% 2	840
	11th to 20th	Night	26% 29% 27% 17% 1	823
	21st to end	Night	24% 23% 32% 18% 3	692
March	1st to 10th	Night	21% 23% 33% 21% 3	840
	11th to 20th	Night	25% 22% 26% 22% 4 1	840
	21st to end	Night	18% 23% 33% 21% 4 1	924
April	1st to 10th	Night	21% 22% 29% 23% 5%	840
	11th to 20th	Night	17% 18% 30% 25% 9%	831
	21st to end	Night	19% 15% 26% 32% 7% 1	788
May	1st to 10th	Night	21% 9% 28% 27% 14% 1	630
	11th to 20th	Night	20% 8% 25% 32% 14%	608
	21st to end	Night	16% 6% 23% 34% 20% 2	455
June	1st to 10th	Night	10% 6% 26% 35% 21% 1	420
	11th to 20th	Night	13% 7% 17% 40% 21% 3	420
	21st to end	Night	9% 3 22% 46% 19% 1	420
July	1st to 10th	Night	9% 2 15% 39% 29% 4	423
	11th to 20th	Night	7% 3 14% 37% 35% 4	612
	21st to end	Night	9% 3 17% 39% 30% 3	690
August	1st to 10th	Night	11% 3 12% 44% 28% 3	627
	11th to 20th	Night	11% 5% 12% 41% 28% 4	629
	21st to end	Night	11% 4 13% 41% 27% 4	924
September	1st to 10th	Night	16% 3 15% 33% 29% 4	840
	11th to 20th	Night	15% 5% 17% 32% 29% 3	840
	21st to end	Night	25% 6% 20% 29% 20% 2	833
October	1st to 10th	Night	20% 9% 17% 29% 22% 3	800
	11th to 20th	Night	17% 14% 23% 33% 12% 1	800
	21st to end	Night	17% 14% 26% 32% 10% 1	880
November	1st to 10th	Night	14% 15% 27% 33% 10% 1	820
	11th to 20th	Night	20% 19% 27% 25% 8% 1	840
	21st to end	Night	18% 20% 29% 26% 6% 1	840
December	1st to 10th	Night	19% 19% 30% 26% 5%	840
	11th to 20th	Night	19% 17% 32% 29% 3	840
	21st to end	Night	18% 20% 29% 31% 3	924

Page generated at 2026-09-26 04:18:40. Version ac07

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