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 2024-11-02.

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% 2 6% 5% 5% 5% 4 6% 8% 40%	101105
	Night	13% 6% 2 6% 4 4 4 4 6% 7% 42%	97800
Transparency	Day	41% 8% 12% 23% 14% 2	100912
	Night	39% 7% 12% 24% 15% 2	97663
Seeing	Day	20% 16% 25% 21% 13% 4	14904
	Night	18% 15% 25% 29% 13% 1	24524

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 6% 5% 5% 5% 4 5% 5% 41%	2749
	11th to 20th	Day	10% 10% 3 10% 6% 6% 4 4 5% 5% 36%	2840
	21st to end	Day	15% 9% 3 8% 6% 5% 4 3 4 6% 36%	3124
February	1st to 10th	Day	12% 10% 3 9% 6% 3 5% 3 6% 6% 38%	1710
	11th to 20th	Day	14% 9% 4 7% 5% 4 5% 4 4 6% 38%	1663
	21st to end	Day	15% 9% 3 6% 5% 4 4 3 4 7% 39%	1596
March	1st to 10th	Day	18% 9% 3 7% 5% 5% 4 3 4 6% 35%	3435
	11th to 20th	Day	8% 6% 2 6% 4 3 4 4 6% 7% 50%	3480
	21st to end	Day	16% 9% 2 7% 4 4 4 4 5% 6% 38%	3815
April	1st to 10th	Day	10% 7% 3 7% 5% 6% 5% 5% 7% 8% 39%	2253
	11th to 20th	Day	12% 6% 2 6% 4 5% 4 3 6% 7% 44%	2254
	21st to end	Day	17% 7% 2 6% 4 4 5% 4 6% 5% 39%	2342
May	1st to 10th	Day	20% 7% 3 8% 5% 5% 5% 5% 6% 8% 29%	4082
	11th to 20th	Day	22% 7% 3 6% 4 4 5% 4 6% 8% 31%	4103
	21st to end	Day	10% 5% 2 6% 4 5% 6% 5% 8% 9% 41%	4823
June	1st to 10th	Day	12% 6% 2 4 5% 5% 5% 5% 6% 9% 41%	2660
	11th to 20th	Day	9% 6% 2 6% 5% 6% 5% 6% 8% 9% 37%	2660
	21st to end	Day	9% 5% 1 5% 5% 5% 6% 5% 7% 9% 43%	2660
July	1st to 10th	Day	5% 5% 2 6% 5% 6% 6% 5% 8% 10% 43%	4410
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 5% 8% 11% 39%	4120
	21st to end	Day	11% 8% 3 7% 6% 5% 6% 5% 6% 8% 36%	4466
August	1st to 10th	Day	15% 5% 2 7% 5% 6% 6% 5% 8% 9% 32%	4104
	11th to 20th	Day	8% 5% 2 7% 5% 5% 6% 5% 7% 9% 40%	3994
	21st to end	Day	10% 4 2 6% 3 5% 4 4 7% 8% 47%	4180
September	1st to 10th	Day	15% 6% 2 6% 3 4 4 4 6% 6% 44%	2280
	11th to 20th	Day	13% 6% 2 6% 4 4 4 4 6% 7% 45%	2212
	21st to end	Day	21% 6% 2 6% 5% 5% 4 3 5% 6% 38%	2019
October	1st to 10th	Day	16% 5% 2 5% 4 3 4 4 5% 7% 45%	1900
	11th to 20th	Day	16% 5% 2 5% 4 4 4 3 5% 6% 48%	1900
	21st to end	Day	13% 5% 2 6% 3 4 3 3 6% 6% 49%	2090
November	1st to 10th	Day	11% 5% 2 5% 4 4 5% 3 5% 6% 52%	1863
	11th to 20th	Day	14% 7% 2 4 5% 4 5% 4 5% 7% 45%	1596
	21st to end	Day	14% 5% 2 5% 4 4 6% 3 5% 7% 45%	1520
December	1st to 10th	Day	15% 8% 3 6% 4 5% 5% 4 7% 7% 36%	1520
	11th to 20th	Day	14% 8% 3 5% 5% 4 5% 4 6% 7% 40%	1910
	21st to end	Day	17% 6% 2 6% 6% 5% 6% 5% 7% 8% 33%	2772
January	1st to 10th	Night	10% 8% 2 6% 6% 4 4 4 6% 8% 42%	4191
	11th to 20th	Night	14% 9% 3 6% 3 3 3 4 5% 6% 43%	4120
	21st to end	Night	16% 9% 3 6% 4 3 4 4 6% 6% 38%	4532
February	1st to 10th	Night	12% 8% 3 6% 5% 4 5% 4 6% 6% 41%	2470
	11th to 20th	Night	14% 9% 3 6% 5% 4 5% 5% 5% 6% 39%	2403
	21st to end	Night	14% 10% 3 7% 5% 4 4 4 5% 6% 38%	1854
March	1st to 10th	Night	19% 7% 2 6% 5% 4 4 3 5% 6% 38%	3418
	11th to 20th	Night	9% 5% 2 6% 5% 4 5% 4 5% 8% 48%	3480
	21st to end	Night	12% 6% 2 6% 4 4 4 4 5% 6% 48%	3817
April	1st to 10th	Night	14% 8% 2 7% 5% 4 5% 5% 5% 7% 39%	1925
	11th to 20th	Night	13% 6% 2 6% 5% 4 4 4 6% 8% 43%	1875
	21st to end	Night	16% 6% 2 4 4 4 5% 4 5% 7% 44%	1853
May	1st to 10th	Night	21% 7% 3 7% 5% 5% 4 4 6% 8% 31%	2813
	11th to 20th	Night	24% 8% 3 6% 4 5% 4 3 4 5% 35%	2788
	21st to end	Night	10% 4 2 5% 5% 4 5% 5% 7% 9% 43%	2732
June	1st to 10th	Night	10% 4 2 4 4 4 5% 4 6% 9% 46%	1520
	11th to 20th	Night	10% 5% 2 6% 4 5% 4 5% 6% 10% 43%	1520
	21st to end	Night	9% 5% 1 4 4 4 5% 4 8% 12% 43%	1520
July	1st to 10th	Night	6% 4 2 6% 5% 6% 6% 6% 7% 11% 42%	2544
	11th to 20th	Night	6% 6% 2 7% 6% 6% 7% 4 7% 10% 39%	2840
	21st to end	Night	8% 6% 3 8% 5% 5% 6% 5% 8% 9% 37%	3087
August	1st to 10th	Night	15% 5% 3 7% 6% 5% 5% 5% 7% 8% 35%	2825
	11th to 20th	Night	8% 5% 3 6% 5% 5% 5% 4 7% 9% 43%	2803
	21st to end	Night	13% 4 2 5% 3 4 4 4 6% 9% 47%	3476
September	1st to 10th	Night	14% 6% 2 5% 3 5% 5% 4 5% 7% 45%	1900
	11th to 20th	Night	13% 6% 2 5% 3 3 2 3 5% 8% 50%	1965
	21st to end	Night	20% 4 2 6% 4 4 4 3 4 6% 43%	2159
October	1st to 10th	Night	19% 5% 2 5% 3 3 3 3 4 6% 47%	2280
	11th to 20th	Night	14% 4 2 4 4 3 4 3 5% 6% 52%	2280
	21st to end	Night	14% 5% 1 4 2 4 4 3 5% 7% 50%	2508
November	1st to 10th	Night	10% 7% 2 5% 3 4 3 3 5% 6% 52%	2234
	11th to 20th	Night	13% 7% 2 4 4 3 4 3 5% 7% 47%	2579
	21st to end	Night	13% 5% 2 5% 5% 5% 5% 5% 6% 6% 44%	2660
December	1st to 10th	Night	15% 6% 3 8% 5% 4 4 4 5% 7% 39%	2660
	11th to 20th	Night	14% 6% 2 6% 4 5% 5% 5% 5% 7% 41%	3285
	21st to end	Night	15% 6% 3 6% 5% 5% 6% 6% 7% 9% 33%	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	50% 5% 10% 20% 12% 3	3435
	11th to 20th	Day	33% 6% 8% 29% 21% 3	3480
	21st to end	Day	44% 7% 12% 20% 13% 3	3815
April	1st to 10th	Day	40% 8% 12% 19% 17% 5%	2253
	11th to 20th	Day	38% 6% 11% 22% 19% 5%	2254
	21st to end	Day	44% 6% 10% 22% 14% 3	2342
May	1st to 10th	Day	50% 9% 10% 21% 9% 1	4120
	11th to 20th	Day	49% 8% 10% 23% 8% 1	4107
	21st to end	Day	34% 11% 14% 23% 16% 2	4837
June	1st to 10th	Day	38% 9% 13% 24% 16% 1	2660
	11th to 20th	Day	38% 12% 13% 22% 13% 2	2660
	21st to end	Day	35% 9% 15% 25% 15% 2	2660
July	1st to 10th	Day	34% 10% 17% 24% 11% 5%	4340
	11th to 20th	Day	35% 10% 14% 30% 10% 1	4051
	21st to end	Day	43% 8% 8% 23% 16% 1	4324
August	1st to 10th	Day	45% 9% 15% 22% 8%	4091
	11th to 20th	Day	36% 8% 13% 26% 16% 1	4033
	21st to end	Day	33% 7% 15% 27% 16% 1	4180
September	1st to 10th	Day	39% 7% 12% 18% 20% 4	2280
	11th to 20th	Day	36% 7% 8% 26% 19% 3	2212
	21st to end	Day	47% 5% 9% 20% 17% 1	2019
October	1st to 10th	Day	37% 8% 10% 24% 17% 4	1900
	11th to 20th	Day	37% 5% 10% 25% 20% 3	1900
	21st to end	Day	35% 5% 9% 26% 21% 4	2090
November	1st to 10th	Day	33% 5% 11% 24% 22% 5%	1863
	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	45% 6% 10% 27% 10% 2	3418
	11th to 20th	Night	34% 7% 11% 29% 18% 2	3480
	21st to end	Night	36% 7% 10% 25% 19% 4	3817
April	1st to 10th	Night	42% 7% 10% 20% 17% 4	1925
	11th to 20th	Night	38% 7% 11% 22% 17% 5%	1875
	21st to end	Night	39% 7% 11% 27% 13% 3	1853
May	1st to 10th	Night	51% 8% 10% 18% 10% 2	2840
	11th to 20th	Night	50% 7% 12% 22% 9% 1	2789
	21st to end	Night	34% 9% 17% 26% 9% 4	2739
June	1st to 10th	Night	33% 9% 12% 29% 15% 2	1520
	11th to 20th	Night	36% 9% 15% 26% 13% 1	1520
	21st to end	Night	32% 8% 18% 24% 17% 2	1520
July	1st to 10th	Night	33% 11% 21% 18% 13% 5%	2504
	11th to 20th	Night	37% 10% 17% 23% 11% 1	2786
	21st to end	Night	38% 10% 16% 21% 15%	2988
August	1st to 10th	Night	44% 9% 16% 24% 7%	2814
	11th to 20th	Night	35% 7% 16% 24% 18%	2830
	21st to end	Night	33% 6% 15% 30% 14% 1	3476
September	1st to 10th	Night	38% 7% 12% 21% 19% 4	1900
	11th to 20th	Night	34% 4 9% 29% 21% 2	1965
	21st to end	Night	43% 6% 9% 23% 18% 2	2159
October	1st to 10th	Night	39% 5% 11% 24% 19% 2	2280
	11th to 20th	Night	32% 5% 11% 27% 22% 3	2280
	21st to end	Night	33% 5% 10% 26% 23% 3	2508
November	1st to 10th	Night	32% 6% 11% 24% 21% 5%	2234
	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	30% 25% 23% 19% 3	460
	11th to 20th	Day	27% 30% 23% 13% 6% 1	460
	21st to end	Day	26% 26% 28% 14% 5% 1	506
April	1st to 10th	Day	21% 28% 25% 18% 7%	460
	11th to 20th	Day	21% 20% 28% 18% 10% 4	452
	21st to end	Day	27% 18% 30% 16% 8% 2	460
May	1st to 10th	Day	24% 21% 25% 17% 10% 4	463
	11th to 20th	Day	23% 17% 28% 17% 12% 3	487
	21st to end	Day	18% 12% 24% 25% 16% 5%	529
June	1st to 10th	Day	17% 11% 28% 24% 16% 4	490
	11th to 20th	Day	16% 12% 26% 22% 18% 5%	490
	21st to end	Day	12% 9% 31% 29% 14% 5%	490
July	1st to 10th	Day	11% 6% 21% 31% 22% 10%	485
	11th to 20th	Day	6% 3 26% 31% 24% 9%	484
	21st to end	Day	13% 8% 21% 31% 18% 8%	532
August	1st to 10th	Day	13% 6% 21% 27% 24% 10%	486
	11th to 20th	Day	14% 5% 20% 29% 23% 10%	479
	21st to end	Day	10% 7% 20% 28% 22% 12%	539
September	1st to 10th	Day	17% 11% 20% 22% 23% 9%	490
	11th to 20th	Day	16% 5% 20% 29% 22% 9%	490
	21st to end	Day	29% 10% 21% 20% 14% 4	490
October	1st to 10th	Day	20% 7% 22% 28% 18% 4	490
	11th to 20th	Day	19% 18% 25% 23% 12% 3	490
	21st to end	Day	17% 17% 34% 20% 9% 3	539
November	1st to 10th	Day	18% 16% 31% 21% 11% 3	457
	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	21% 22% 32% 21% 4	760
	11th to 20th	Night	25% 23% 26% 21% 4 1	760
	21st to end	Night	18% 23% 32% 21% 5% 1	836
April	1st to 10th	Night	21% 23% 29% 23% 4	760
	11th to 20th	Night	17% 19% 29% 25% 9%	751
	21st to end	Night	20% 16% 26% 31% 7% 1	713
May	1st to 10th	Night	21% 9% 27% 27% 15% 1	570
	11th to 20th	Night	20% 8% 25% 32% 15% 1	550
	21st to end	Night	13% 6% 21% 36% 22% 2	411
June	1st to 10th	Night	10% 6% 27% 34% 22% 1	380
	11th to 20th	Night	12% 6% 16% 39% 23% 3	380
	21st to end	Night	9% 3 21% 48% 17% 1	380
July	1st to 10th	Night	10% 2 15% 40% 28% 5%	381
	11th to 20th	Night	8% 3 14% 37% 35% 4	552
	21st to end	Night	9% 3 17% 39% 30% 3	624
August	1st to 10th	Night	10% 3 13% 43% 29% 3	567
	11th to 20th	Night	11% 5% 12% 40% 28% 4	569
	21st to end	Night	11% 4 12% 40% 28% 4	836
September	1st to 10th	Night	17% 4 14% 31% 30% 5%	760
	11th to 20th	Night	15% 5% 17% 31% 29% 4	760
	21st to end	Night	23% 5% 21% 28% 21% 2	760
October	1st to 10th	Night	20% 9% 17% 29% 21% 3	760
	11th to 20th	Night	16% 14% 23% 33% 13% 1	760
	21st to end	Night	17% 15% 25% 31% 11% 1	836
November	1st to 10th	Night	14% 15% 27% 32% 11% 1	745
	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 2024-10-30 01:23:00. Version ac07

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