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 2024-03-06.

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 5% 6% 4 5% 5% 6% 7% 40%	78590
	Night	13% 6% 3 5% 5% 3 5% 5% 6% 7% 43%	80922
Transparency	Day	41% 7% 11% 22% 15% 3	78306
	Night	39% 7% 12% 24% 16% 3	80725
Seeing	Day	21% 16% 25% 21% 13% 4	13940
	Night	18% 15% 25% 29% 13% 1	23727

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% 7% 3 5% 5% 4 5% 5% 5% 5% 41%	2749
	11th to 20th	Day	10% 10% 4 8% 7% 5% 5% 5% 5% 5% 36%	2840
	21st to end	Day	15% 8% 4 7% 7% 3 5% 4 4 6% 36%	3124
February	1st to 10th	Day	12% 9% 3 7% 7% 3 5% 4 6% 6% 38%	1710
	11th to 20th	Day	14% 8% 4 6% 5% 3 5% 5% 4 6% 38%	1663
	21st to end	Day	15% 8% 3 6% 6% 3 5% 4 5% 7% 39%	1596
March	1st to 10th	Day	12% 7% 2 5% 5% 4 4 4 4 6% 47%	2035
	11th to 20th	Day	13% 8% 3 6% 6% 3 5% 6% 5% 6% 40%	1980
	21st to end	Day	15% 9% 3 7% 5% 3 4 6% 5% 6% 36%	2178
April	1st to 10th	Day	9% 7% 3 6% 5% 4 6% 6% 7% 8% 40%	2134
	11th to 20th	Day	13% 5% 3 5% 5% 3 5% 4 5% 7% 44%	2134
	21st to end	Day	17% 6% 2 6% 5% 3 5% 6% 6% 5% 39%	2218
May	1st to 10th	Day	16% 6% 3 6% 6% 4 5% 5% 6% 8% 35%	2340
	11th to 20th	Day	19% 6% 3 5% 6% 3 6% 4 6% 8% 34%	2309
	21st to end	Day	14% 5% 2 6% 6% 4 6% 5% 6% 8% 39%	2725
June	1st to 10th	Day	12% 5% 2 4 5% 4 5% 6% 6% 9% 41%	2520
	11th to 20th	Day	10% 6% 3 6% 6% 4 6% 7% 8% 9% 37%	2520
	21st to end	Day	10% 4 1 4 5% 4 6% 6% 7% 10% 43%	2520
July	1st to 10th	Day	8% 6% 3 6% 7% 4 6% 5% 7% 8% 40%	2504
	11th to 20th	Day	6% 4 3 6% 6% 4 7% 6% 8% 10% 40%	2340
	21st to end	Day	11% 6% 3 4 6% 3 7% 7% 7% 9% 35%	2547
August	1st to 10th	Day	9% 6% 3 7% 7% 5% 8% 6% 8% 9% 33%	2327
	11th to 20th	Day	12% 5% 2 5% 6% 5% 6% 6% 7% 9% 37%	2281
	21st to end	Day	11% 5% 2 6% 5% 4 6% 6% 7% 9% 41%	2376
September	1st to 10th	Day	15% 6% 2 6% 4 3 5% 5% 6% 6% 42%	2160
	11th to 20th	Day	13% 5% 3 5% 5% 3 4 5% 6% 7% 45%	2096
	21st to end	Day	19% 6% 3 5% 5% 4 4 4 5% 7% 39%	1913
October	1st to 10th	Day	16% 5% 3 4 4 3 4 5% 5% 7% 44%	1800
	11th to 20th	Day	17% 5% 2 5% 4 3 4 4 5% 6% 46%	1800
	21st to end	Day	14% 5% 2 5% 4 3 3 4 6% 6% 48%	1980
November	1st to 10th	Day	11% 5% 2 4 4 3 5% 4 5% 6% 52%	1853
	11th to 20th	Day	14% 6% 3 4 5% 3 5% 4 5% 7% 45%	1596
	21st to end	Day	14% 5% 2 4 5% 3 5% 5% 5% 7% 45%	1520
December	1st to 10th	Day	15% 8% 3 6% 4 4 5% 5% 7% 7% 36%	1520
	11th to 20th	Day	14% 7% 3 4 6% 3 5% 5% 5% 7% 40%	1910
	21st to end	Day	17% 5% 2 5% 6% 3 6% 6% 7% 8% 33%	2772
January	1st to 10th	Night	10% 8% 2 5% 6% 3 4 5% 6% 8% 42%	4191
	11th to 20th	Night	14% 9% 3 5% 4 2 4 5% 5% 6% 43%	4120
	21st to end	Night	16% 9% 3 6% 4 2 4 5% 6% 6% 38%	4532
February	1st to 10th	Night	13% 7% 3 5% 6% 2 5% 5% 6% 6% 41%	2470
	11th to 20th	Night	15% 8% 3 5% 5% 2 5% 6% 5% 6% 39%	2403
	21st to end	Night	15% 9% 4 6% 5% 3 4 5% 5% 6% 38%	1854
March	1st to 10th	Night	12% 5% 2 4 5% 3 5% 4 6% 6% 48%	2042
	11th to 20th	Night	15% 6% 2 6% 5% 3 4 5% 5% 7% 42%	1980
	21st to end	Night	14% 6% 3 6% 5% 3 5% 5% 5% 6% 42%	2178
April	1st to 10th	Night	13% 7% 2 7% 5% 3 5% 6% 5% 7% 40%	1824
	11th to 20th	Night	13% 5% 2 5% 5% 3 5% 5% 6% 9% 43%	1775
	21st to end	Night	17% 5% 2 4 4 3 5% 5% 5% 7% 44%	1756
May	1st to 10th	Night	17% 6% 2 5% 5% 3 4 5% 5% 7% 40%	1620
	11th to 20th	Night	17% 6% 4 5% 5% 4 5% 4 4 6% 40%	1582
	21st to end	Night	13% 4 2 4 5% 3 5% 6% 6% 9% 42%	1550
June	1st to 10th	Night	10% 4 2 3 4 3 5% 5% 6% 10% 47%	1440
	11th to 20th	Night	11% 5% 3 5% 5% 3 6% 5% 6% 9% 43%	1440
	21st to end	Night	9% 5% 2 3 5% 3 5% 5% 8% 12% 44%	1440
July	1st to 10th	Night	10% 4 2 6% 6% 3 6% 6% 6% 10% 41%	1450
	11th to 20th	Night	6% 4 2 5% 5% 4 5% 4 7% 9% 48%	1620
	21st to end	Night	7% 4 2 4 5% 3 7% 7% 9% 10% 42%	1771
August	1st to 10th	Night	7% 5% 3 5% 6% 4 6% 6% 7% 9% 42%	1611
	11th to 20th	Night	10% 5% 3 5% 5% 3 5% 5% 7% 8% 44%	1602
	21st to end	Night	10% 5% 2 5% 5% 3 5% 5% 6% 10% 44%	1980
September	1st to 10th	Night	15% 6% 2 4 4 3 5% 5% 5% 7% 45%	1800
	11th to 20th	Night	13% 6% 2 4 4 2 3 3 5% 8% 51%	1861
	21st to end	Night	18% 4 2 5% 4 3 4 4 4 7% 45%	2045
October	1st to 10th	Night	19% 4 2 5% 4 3 3 4 4 6% 46%	2160
	11th to 20th	Night	14% 4 2 4 4 2 3 5% 4 7% 51%	2160
	21st to end	Night	15% 5% 2 3 3 3 4 4 4 8% 49%	2376
November	1st to 10th	Night	10% 6% 3 4 4 3 3 4 5% 7% 52%	2221
	11th to 20th	Night	13% 6% 3 4 4 3 4 4 5% 7% 47%	2579
	21st to end	Night	13% 5% 2 5% 5% 3 5% 5% 5% 7% 45%	2660
December	1st to 10th	Night	15% 6% 3 7% 6% 3 5% 5% 5% 7% 39%	2660
	11th to 20th	Night	15% 6% 2 5% 4 3 5% 5% 5% 7% 42%	3285
	21st to end	Night	15% 6% 3 5% 6% 3 6% 7% 7% 9% 34%	4884

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% 7% 7% 26% 15% 3	2750
	11th to 20th	Day	49% 6% 8% 18% 14% 5%	2840
	21st to end	Day	48% 6% 10% 21% 13% 2	3124
February	1st to 10th	Day	46% 5% 13% 20% 13% 2	1710
	11th to 20th	Day	45% 7% 10% 20% 16% 2	1672
	21st to end	Day	45% 6% 12% 19% 15% 4	1596
March	1st to 10th	Day	39% 5% 10% 25% 19% 2	2035
	11th to 20th	Day	44% 7% 9% 19% 17% 5%	1980
	21st to end	Day	46% 7% 10% 18% 14% 4	2178
April	1st to 10th	Day	40% 7% 12% 19% 17% 5%	2134
	11th to 20th	Day	38% 5% 11% 21% 19% 6%	2134
	21st to end	Day	45% 6% 10% 22% 14% 4	2218
May	1st to 10th	Day	44% 8% 13% 20% 14% 2	2340
	11th to 20th	Day	48% 8% 11% 19% 11% 3	2313
	21st to end	Day	43% 8% 14% 24% 10% 1	2725
June	1st to 10th	Day	38% 9% 12% 24% 15% 1	2520
	11th to 20th	Day	40% 12% 13% 20% 13% 2	2520
	21st to end	Day	35% 9% 15% 25% 15% 2	2520
July	1st to 10th	Day	40% 10% 13% 21% 15% 3	2434
	11th to 20th	Day	35% 10% 14% 25% 14% 2	2271
	21st to end	Day	40% 11% 11% 20% 16% 2	2405
August	1st to 10th	Day	43% 10% 15% 21% 10%	2314
	11th to 20th	Day	41% 9% 15% 21% 13% 1	2281
	21st to end	Day	38% 9% 15% 24% 12% 3	2376
September	1st to 10th	Day	40% 8% 12% 18% 18% 4	2160
	11th to 20th	Day	36% 7% 8% 26% 19% 3	2096
	21st to end	Day	46% 5% 9% 21% 18% 1	1913
October	1st to 10th	Day	38% 8% 11% 24% 16% 4	1800
	11th to 20th	Day	39% 5% 10% 24% 19% 3	1800
	21st to end	Day	37% 5% 9% 26% 20% 4	1980
November	1st to 10th	Day	33% 5% 11% 25% 22% 4	1853
	11th to 20th	Day	38% 6% 10% 20% 22% 4	1596
	21st to end	Day	38% 6% 11% 26% 17% 2	1520
December	1st to 10th	Day	45% 7% 12% 22% 11% 2	1520
	11th to 20th	Day	41% 6% 11% 28% 11% 3	1906
	21st to end	Day	43% 8% 15% 23% 10% 1	2772
January	1st to 10th	Night	37% 7% 11% 26% 16% 2	4191
	11th to 20th	Night	42% 5% 11% 24% 14% 4	4120
	21st to end	Night	45% 7% 9% 25% 13% 1	4532
February	1st to 10th	Night	42% 6% 12% 25% 13% 1	2470
	11th to 20th	Night	43% 7% 9% 22% 15% 4	2405
	21st to end	Night	46% 6% 11% 20% 13% 5%	1854
March	1st to 10th	Night	35% 5% 11% 29% 16% 3	2042
	11th to 20th	Night	41% 6% 11% 22% 17% 3	1980
	21st to end	Night	42% 7% 12% 20% 15% 4	2178
April	1st to 10th	Night	42% 7% 10% 21% 17% 4	1824
	11th to 20th	Night	38% 6% 11% 22% 17% 5%	1775
	21st to end	Night	40% 7% 11% 26% 13% 3	1756
May	1st to 10th	Night	42% 7% 13% 22% 13% 4	1620
	11th to 20th	Night	44% 7% 13% 19% 15% 1	1583
	21st to end	Night	37% 8% 18% 24% 10% 1	1551
June	1st to 10th	Night	33% 9% 13% 29% 15% 2	1440
	11th to 20th	Night	37% 9% 15% 25% 13% 1	1440
	21st to end	Night	31% 8% 18% 25% 16% 2	1440
July	1st to 10th	Night	38% 10% 16% 20% 13% 4	1410
	11th to 20th	Night	31% 10% 17% 24% 15% 3	1566
	21st to end	Night	29% 11% 19% 24% 16%	1672
August	1st to 10th	Night	36% 10% 17% 24% 13% 1	1600
	11th to 20th	Night	37% 7% 16% 24% 14%	1602
	21st to end	Night	36% 7% 15% 26% 14% 2	1980
September	1st to 10th	Night	38% 6% 13% 21% 18% 4	1800
	11th to 20th	Night	34% 4 10% 29% 21% 2	1861
	21st to end	Night	41% 6% 9% 23% 19% 2	2045
October	1st to 10th	Night	39% 5% 11% 25% 18% 2	2160
	11th to 20th	Night	33% 5% 11% 28% 21% 2	2160
	21st to end	Night	35% 5% 10% 25% 23% 2	2376
November	1st to 10th	Night	32% 6% 11% 25% 21% 5%	2221
	11th to 20th	Night	36% 6% 8% 25% 20% 5%	2579
	21st to end	Night	38% 6% 12% 23% 19% 3	2660
December	1st to 10th	Night	44% 7% 11% 25% 11% 2	2660
	11th to 20th	Night	41% 6% 10% 23% 17% 2	3288
	21st to end	Night	42% 9% 16% 20% 13% 1	4884

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	32% 33% 22% 10% 3	247
	11th to 20th	Day	33% 27% 25% 12% 3	270
	21st to end	Day	30% 28% 30% 10% 2	297
February	1st to 10th	Day	30% 29% 29% 10% 2	270
	11th to 20th	Day	43% 29% 26% 2	270
	21st to end	Day	34% 25% 26% 13% 1	358
March	1st to 10th	Day	29% 25% 24% 19% 3	440
	11th to 20th	Day	26% 30% 23% 14% 6% 1	420
	21st to end	Day	25% 26% 28% 15% 5% 1	462
April	1st to 10th	Day	20% 28% 25% 19% 7%	420
	11th to 20th	Day	20% 19% 28% 18% 11% 4	412
	21st to end	Day	28% 17% 30% 15% 8% 2	420
May	1st to 10th	Day	24% 21% 25% 16% 9% 4	423
	11th to 20th	Day	23% 18% 29% 17% 11% 3	447
	21st to end	Day	19% 12% 23% 25% 16% 6%	485
June	1st to 10th	Day	17% 10% 28% 24% 16% 4	450
	11th to 20th	Day	17% 13% 26% 21% 17% 5%	450
	21st to end	Day	12% 9% 31% 30% 14% 5%	450
July	1st to 10th	Day	11% 6% 21% 29% 22% 10%	445
	11th to 20th	Day	5% 3 25% 31% 26% 10%	444
	21st to end	Day	13% 8% 21% 29% 19% 9%	488
August	1st to 10th	Day	12% 6% 19% 27% 24% 11%	446
	11th to 20th	Day	14% 5% 18% 29% 23% 10%	439
	21st to end	Day	10% 7% 22% 28% 21% 13%	495
September	1st to 10th	Day	18% 10% 19% 21% 23% 9%	450
	11th to 20th	Day	16% 5% 20% 29% 22% 8%	450
	21st to end	Day	26% 11% 22% 21% 15% 5%	450
October	1st to 10th	Day	20% 7% 22% 27% 19% 5%	450
	11th to 20th	Day	19% 18% 26% 24% 12% 2	450
	21st to end	Day	19% 18% 34% 18% 8% 3	495
November	1st to 10th	Day	18% 16% 30% 22% 11% 3	453
	11th to 20th	Day	21% 23% 30% 16% 7% 2	256
	21st to end	Day	24% 21% 36% 16% 3 1	180
December	1st to 10th	Day	26% 30% 27% 13% 4 1	180
	11th to 20th	Day	28% 25% 27% 16% 4	180
	21st to end	Day	22% 22% 29% 22% 5% 1	198
January	1st to 10th	Night	20% 24% 34% 19% 3	760
	11th to 20th	Night	23% 21% 27% 25% 4	760
	21st to end	Night	20% 23% 34% 21% 2	836
February	1st to 10th	Night	18% 24% 29% 27% 2	760
	11th to 20th	Night	25% 30% 27% 17% 1	743
	21st to end	Night	25% 23% 30% 18% 3	628
March	1st to 10th	Night	20% 22% 33% 22% 4	743
	11th to 20th	Night	25% 21% 26% 22% 4 1	720
	21st to end	Night	18% 22% 32% 21% 5% 1	792
April	1st to 10th	Night	20% 23% 29% 23% 5%	720
	11th to 20th	Night	17% 18% 29% 26% 10%	711
	21st to end	Night	20% 16% 25% 30% 7% 1	676
May	1st to 10th	Night	21% 9% 27% 26% 16% 1	540
	11th to 20th	Night	19% 8% 25% 34% 15%	521
	21st to end	Night	14% 6% 21% 37% 22% 2	389
June	1st to 10th	Night	11% 6% 25% 35% 22% 1	360
	11th to 20th	Night	13% 6% 17% 39% 22% 3	360
	21st to end	Night	9% 3 21% 48% 18% 1	360
July	1st to 10th	Night	10% 2 16% 38% 28% 5%	360
	11th to 20th	Night	8% 3 14% 35% 35% 5%	522
	21st to end	Night	9% 3 17% 38% 31% 3	591
August	1st to 10th	Night	9% 3 13% 43% 29% 3	537
	11th to 20th	Night	11% 5% 11% 39% 29% 4	538
	21st to end	Night	11% 4 13% 39% 29% 4	792
September	1st to 10th	Night	18% 4 14% 29% 30% 5%	720
	11th to 20th	Night	14% 5% 18% 30% 29% 4	720
	21st to end	Night	21% 6% 21% 28% 22% 2	720
October	1st to 10th	Night	20% 9% 17% 29% 22% 3	720
	11th to 20th	Night	17% 15% 22% 33% 12% 1	720
	21st to end	Night	18% 16% 26% 30% 10% 1	792
November	1st to 10th	Night	14% 15% 27% 32% 11% 1	740
	11th to 20th	Night	19% 19% 27% 26% 9% 1	760
	21st to end	Night	17% 20% 28% 27% 7% 1	760
December	1st to 10th	Night	20% 19% 30% 25% 5% 1	760
	11th to 20th	Night	18% 17% 32% 29% 4	760
	21st to end	Night	18% 20% 28% 31% 3	836

Page generated at 2024-03-03 06:28:56. Version ac07

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