Searcy
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Searcy clear sky chart from 2005-11-06 to 2024-01-31.

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% 5% 2 5% 5% 3 5% 5% 5% 7% 45%	74809
	Night	13% 5% 2 4 4 3 4 4 5% 7% 50%	75328
Transparency	Day	38% 6% 11% 23% 18% 4	74533
	Night	35% 5% 10% 23% 22% 6%	75125
Seeing	Day	14% 7% 21% 26% 23% 10%	14277
	Night	15% 5% 25% 33% 19% 2	24229

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	21% 6% 3 4 3 2 3 3 4 4 46%	1707
	11th to 20th	Day	19% 6% 3 6% 5% 3 3 4 3 5% 42%	1710
	21st to end	Day	18% 5% 2 4 3 2 3 3 4 5% 50%	1872
February	1st to 10th	Day	20% 7% 3 5% 4 2 4 4 4 4 43%	1620
	11th to 20th	Day	18% 5% 3 7% 6% 3 4 4 5% 5% 41%	1731
	21st to end	Day	24% 8% 3 4 5% 3 4 4 3 5% 37%	1480
March	1st to 10th	Day	19% 6% 2 5% 4 2 4 4 4 6% 45%	1962
	11th to 20th	Day	20% 8% 3 5% 5% 3 4 3 4 4 41%	1980
	21st to end	Day	17% 7% 2 5% 6% 3 5% 4 5% 5% 40%	2214
April	1st to 10th	Day	15% 5% 2 4 5% 3 4 4 5% 7% 47%	2160
	11th to 20th	Day	16% 5% 3 5% 4 4 4 4 4 7% 45%	2134
	21st to end	Day	16% 6% 3 5% 6% 4 4 5% 5% 7% 42%	2160
May	1st to 10th	Day	16% 5% 3 5% 5% 3 5% 5% 5% 6% 41%	2160
	11th to 20th	Day	13% 5% 2 5% 5% 3 5% 5% 6% 8% 42%	2225
	21st to end	Day	8% 5% 3 6% 7% 4 6% 6% 8% 10% 38%	2659
June	1st to 10th	Day	7% 4 2 5% 5% 4 6% 7% 7% 9% 43%	2520
	11th to 20th	Day	5% 3 2 4 5% 3 5% 6% 9% 11% 48%	2520
	21st to end	Day	5% 3 2 4 5% 3 5% 5% 8% 9% 52%	2520
July	1st to 10th	Day	6% 4 3 6% 6% 4 7% 7% 7% 10% 39%	2378
	11th to 20th	Day	5% 4 2 5% 6% 4 7% 6% 7% 9% 44%	2340
	21st to end	Day	6% 4 2 6% 6% 3 5% 5% 8% 10% 45%	2546
August	1st to 10th	Day	6% 4 2 5% 6% 4 6% 6% 9% 11% 41%	2305
	11th to 20th	Day	10% 4 2 5% 5% 4 5% 6% 6% 9% 43%	2125
	21st to end	Day	8% 4 2 4 5% 3 5% 7% 7% 9% 45%	2376
September	1st to 10th	Day	10% 4 3 4 5% 3 6% 5% 6% 8% 46%	2160
	11th to 20th	Day	13% 5% 2 4 4 2 4 4 5% 8% 48%	2160
	21st to end	Day	10% 4 1 3 4 3 3 4 4 6% 56%	1915
October	1st to 10th	Day	10% 3 1 3 4 2 3 4 5% 6% 57%	1800
	11th to 20th	Day	13% 5% 2 3 3 2 4 3 3 6% 55%	1800
	21st to end	Day	19% 5% 2 4 3 2 3 4 4 6% 50%	1980
November	1st to 10th	Day	12% 6% 2 3 3 2 3 3 3 5% 57%	1858
	11th to 20th	Day	12% 5% 2 5% 4 2 3 3 5% 7% 53%	1728
	21st to end	Day	21% 6% 2 5% 4 2 3 3 3 5% 44%	1710
December	1st to 10th	Day	20% 6% 2 4 4 3 4 3 4 5% 47%	1520
	11th to 20th	Day	17% 7% 3 5% 5% 3 3 4 4 5% 43%	1918
	21st to end	Day	16% 7% 3 6% 6% 4 4 4 5% 5% 39%	2856
January	1st to 10th	Night	19% 6% 2 3 4 2 3 3 4 5% 49%	2458
	11th to 20th	Night	19% 6% 3 5% 4 2 3 4 3 4 47%	2470
	21st to end	Night	17% 5% 2 4 3 2 3 3 4 4 51%	2711
February	1st to 10th	Night	21% 8% 3 5% 5% 2 4 4 3 4 42%	2340
	11th to 20th	Night	19% 6% 3 5% 4 2 3 3 3 6% 46%	2112
	21st to end	Night	20% 6% 2 5% 5% 3 3 3 4 4 45%	1776
March	1st to 10th	Night	19% 5% 2 5% 4 2 3 3 5% 5% 46%	2012
	11th to 20th	Night	17% 7% 3 6% 5% 3 3 4 3 5% 43%	1980
	21st to end	Night	17% 6% 3 6% 5% 3 4 4 5% 6% 43%	2140
April	1st to 10th	Night	11% 5% 2 4 4 3 4 4 5% 9% 50%	1800
	11th to 20th	Night	12% 5% 2 4 3 2 4 4 5% 8% 50%	1775
	21st to end	Night	14% 4 3 5% 5% 3 4 5% 6% 6% 48%	1800
May	1st to 10th	Night	15% 4 3 4 3 2 4 4 5% 8% 49%	1800
	11th to 20th	Night	15% 5% 3 5% 4 3 3 4 5% 7% 47%	1665
	21st to end	Night	7% 5% 2 6% 6% 5% 6% 5% 6% 10% 42%	1613
June	1st to 10th	Night	6% 4 2 5% 4 3 5% 6% 6% 12% 50%	1440
	11th to 20th	Night	2 2 1 3 4 3 5% 3 6% 9% 61%	1440
	21st to end	Night	3 2 2 3 3 2 4 5% 6% 10% 59%	1440
July	1st to 10th	Night	3 3 2 4 4 3 5% 7% 7% 11% 51%	1575
	11th to 20th	Night	5% 2 1 4 5% 3 4 5% 8% 13% 51%	1620
	21st to end	Night	6% 3 2 4 3 3 4 5% 6% 10% 55%	1772
August	1st to 10th	Night	2 3 2 4 5% 3 5% 6% 7% 10% 53%	1632
	11th to 20th	Night	7% 4 2 4 4 3 4 4 8% 11% 50%	1776
	21st to end	Night	7% 4 2 4 4 3 5% 5% 6% 10% 50%	1980
September	1st to 10th	Night	8% 4 2 5% 4 3 3 4 5% 8% 55%	1800
	11th to 20th	Night	9% 4 2 5% 5% 3 4 5% 5% 6% 52%	1800
	21st to end	Night	8% 4 2 3 3 2 3 4 5% 6% 60%	2023
October	1st to 10th	Night	8% 4 1 3 3 2 3 3 4 7% 61%	2160
	11th to 20th	Night	11% 5% 2 4 3 2 3 3 3 5% 59%	2160
	21st to end	Night	18% 5% 2 4 4 2 3 3 3 4 53%	2376
November	1st to 10th	Night	11% 5% 2 4 4 1 3 3 5% 5% 58%	2220
	11th to 20th	Night	14% 3 1 4 4 2 3 3 5% 6% 57%	2450
	21st to end	Night	16% 5% 2 5% 4 3 3 4 4 5% 49%	2470
December	1st to 10th	Night	19% 6% 2 4 5% 3 4 3 4 4 47%	2657
	11th to 20th	Night	17% 5% 2 6% 6% 2 3 3 3 4 50%	3279
	21st to end	Night	17% 7% 3 6% 5% 3 4 4 4 5% 42%	4806

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% 3 7% 24% 18% 5%	1708
	11th to 20th	Day	46% 3 8% 23% 18% 2	1710
	21st to end	Day	39% 2 8% 26% 21% 5%	1872
February	1st to 10th	Day	45% 4 10% 22% 16% 3	1620
	11th to 20th	Day	45% 4 9% 21% 17% 4	1741
	21st to end	Day	51% 4 7% 16% 15% 7%	1480
March	1st to 10th	Day	42% 4 10% 17% 18% 9%	1962
	11th to 20th	Day	49% 4 7% 20% 17% 3	1980
	21st to end	Day	46% 4 12% 24% 13% 2	2214
April	1st to 10th	Day	38% 6% 9% 24% 21% 3	2160
	11th to 20th	Day	41% 5% 8% 23% 18% 6%	2134
	21st to end	Day	42% 6% 9% 22% 19% 1	2160
May	1st to 10th	Day	44% 7% 11% 19% 18% 2	2160
	11th to 20th	Day	39% 7% 14% 23% 15% 1	2229
	21st to end	Day	39% 8% 15% 24% 13% 1	2659
June	1st to 10th	Day	35% 8% 13% 26% 17% 1	2520
	11th to 20th	Day	27% 8% 16% 29% 18% 3	2520
	21st to end	Day	27% 7% 13% 26% 22% 4	2520
July	1st to 10th	Day	36% 11% 14% 22% 15% 2	2314
	11th to 20th	Day	33% 10% 14% 23% 15% 5%	2271
	21st to end	Day	32% 8% 14% 31% 13% 1	2405
August	1st to 10th	Day	33% 9% 16% 28% 13%	2291
	11th to 20th	Day	37% 6% 12% 27% 16% 2	2125
	21st to end	Day	32% 8% 15% 24% 16% 4	2376
September	1st to 10th	Day	36% 7% 11% 23% 17% 6%	2160
	11th to 20th	Day	35% 6% 11% 18% 25% 6%	2160
	21st to end	Day	29% 5% 9% 22% 28% 7%	1915
October	1st to 10th	Day	27% 5% 9% 24% 27% 7%	1800
	11th to 20th	Day	32% 3 6% 22% 27% 9%	1800
	21st to end	Day	36% 5% 6% 24% 20% 9%	1980
November	1st to 10th	Day	31% 3 7% 26% 25% 8%	1858
	11th to 20th	Day	32% 4 8% 21% 27% 8%	1728
	21st to end	Day	45% 3 5% 19% 22% 5%	1710
December	1st to 10th	Day	41% 3 9% 25% 17% 5%	1520
	11th to 20th	Day	44% 3 6% 22% 21% 4	1915
	21st to end	Day	46% 4 8% 20% 17% 5%	2856
January	1st to 10th	Night	40% 3 7% 21% 25% 4	2458
	11th to 20th	Night	43% 3 8% 22% 20% 4	2470
	21st to end	Night	37% 3 7% 25% 23% 5%	2711
February	1st to 10th	Night	47% 3 7% 20% 18% 5%	2340
	11th to 20th	Night	43% 3 7% 22% 19% 6%	2113
	21st to end	Night	43% 3 7% 18% 20% 8%	1776
March	1st to 10th	Night	40% 3 8% 16% 21% 11%	2012
	11th to 20th	Night	46% 4 8% 19% 18% 5%	1980
	21st to end	Night	43% 4 9% 23% 19% 3	2140
April	1st to 10th	Night	33% 4 12% 25% 20% 6%	1800
	11th to 20th	Night	33% 4 9% 24% 21% 9%	1775
	21st to end	Night	37% 5% 10% 24% 22% 3	1800
May	1st to 10th	Night	35% 6% 12% 23% 18% 6%	1800
	11th to 20th	Night	38% 5% 12% 24% 19% 3	1666
	21st to end	Night	36% 8% 16% 23% 15% 2	1614
June	1st to 10th	Night	27% 7% 13% 29% 21% 3	1440
	11th to 20th	Night	20% 5% 14% 33% 25% 4	1440
	21st to end	Night	20% 6% 14% 30% 23% 7%	1440
July	1st to 10th	Night	24% 10% 18% 29% 17% 2	1530
	11th to 20th	Night	23% 9% 18% 27% 17% 6%	1566
	21st to end	Night	23% 8% 15% 34% 20% 1	1673
August	1st to 10th	Night	23% 8% 19% 34% 16% 1	1622
	11th to 20th	Night	27% 8% 15% 27% 19% 3	1776
	21st to end	Night	29% 9% 14% 25% 18% 5%	1980
September	1st to 10th	Night	29% 5% 11% 25% 21% 9%	1800
	11th to 20th	Night	32% 6% 9% 22% 25% 7%	1800
	21st to end	Night	26% 5% 9% 21% 29% 10%	2023
October	1st to 10th	Night	24% 5% 9% 25% 25% 12%	2160
	11th to 20th	Night	30% 3 5% 19% 32% 10%	2160
	21st to end	Night	36% 3 7% 18% 26% 9%	2376
November	1st to 10th	Night	29% 4 7% 24% 27% 9%	2220
	11th to 20th	Night	30% 3 5% 24% 28% 9%	2450
	21st to end	Night	38% 3 7% 20% 27% 5%	2470
December	1st to 10th	Night	42% 3 7% 21% 21% 6%	2657
	11th to 20th	Night	41% 3 6% 21% 26% 5%	3281
	21st to end	Night	43% 5% 8% 21% 19% 3	4806

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	25% 13% 34% 20% 7% 1	270
	11th to 20th	Day	26% 14% 39% 17% 3	270
	21st to end	Day	19% 11% 40% 24% 5%	294
February	1st to 10th	Day	24% 12% 38% 19% 7% 1	240
	11th to 20th	Day	23% 22% 36% 17% 3	240
	21st to end	Day	36% 14% 30% 14% 5% 1	198
March	1st to 10th	Day	25% 13% 33% 21% 7% 1	240
	11th to 20th	Day	27% 18% 32% 20% 3	240
	21st to end	Day	21% 17% 37% 17% 7% 1	300
April	1st to 10th	Day	16% 12% 33% 28% 10% 1	420
	11th to 20th	Day	20% 9% 34% 26% 8% 2	412
	21st to end	Day	19% 10% 34% 23% 12% 2	420
May	1st to 10th	Day	16% 11% 28% 32% 11% 1	423
	11th to 20th	Day	15% 4 23% 31% 21% 7%	548
	21st to end	Day	9% 3 20% 34% 24% 10%	679
June	1st to 10th	Day	9% 4 11% 29% 31% 15%	630
	11th to 20th	Day	6% 2 10% 34% 34% 14%	630
	21st to end	Day	4 2 16% 33% 29% 16%	630
July	1st to 10th	Day	5% 1 10% 27% 37% 19%	621
	11th to 20th	Day	5% 1 8% 29% 37% 19%	618
	21st to end	Day	7% 2 7% 26% 40% 19%	684
August	1st to 10th	Day	6% 2 9% 30% 39% 14%	603
	11th to 20th	Day	14% 1 9% 25% 34% 17%	439
	21st to end	Day	11% 2 5% 18% 40% 24%	495
September	1st to 10th	Day	10% 2 8% 20% 42% 18%	450
	11th to 20th	Day	10% 1 12% 22% 32% 22%	450
	21st to end	Day	12% 1 15% 29% 30% 13%	349
October	1st to 10th	Day	9% 4 22% 30% 29% 7%	270
	11th to 20th	Day	13% 7% 33% 26% 16% 4	270
	21st to end	Day	25% 11% 27% 24% 10% 4	297
November	1st to 10th	Day	15% 7% 30% 27% 19% 2	270
	11th to 20th	Day	10% 10% 35% 31% 11% 2	270
	21st to end	Day	26% 11% 27% 23% 11% 2	270
December	1st to 10th	Day	23% 10% 33% 20% 11% 3	270
	11th to 20th	Day	24% 12% 33% 19% 10% 1	270
	21st to end	Day	25% 16% 35% 21% 3 1	297
January	1st to 10th	Night	22% 8% 35% 29% 6%	950
	11th to 20th	Night	23% 8% 38% 27% 3	950
	21st to end	Night	20% 7% 40% 30% 3	1043
February	1st to 10th	Night	24% 8% 35% 28% 5%	900
	11th to 20th	Night	23% 8% 38% 28% 3	717
	21st to end	Night	23% 13% 36% 26% 2	592
March	1st to 10th	Night	22% 7% 33% 33% 5%	572
	11th to 20th	Night	22% 9% 33% 31% 4 1	540
	21st to end	Night	19% 9% 32% 31% 8%	594
April	1st to 10th	Night	14% 8% 37% 33% 9%	540
	11th to 20th	Night	14% 9% 32% 34% 11% 1	533
	21st to end	Night	15% 5% 35% 33% 12% 1	540
May	1st to 10th	Night	16% 5% 23% 42% 13% 1	540
	11th to 20th	Night	15% 5% 26% 33% 18% 3	531
	21st to end	Night	9% 3 19% 38% 27% 5%	584
June	1st to 10th	Night	6% 2 12% 37% 37% 6%	540
	11th to 20th	Night	2 1 7% 47% 40% 4	540
	21st to end	Night	4 11% 36% 43% 6%	540
July	1st to 10th	Night	3 1 7% 34% 44% 11%	525
	11th to 20th	Night	5% 1 7% 28% 49% 9%	522
	21st to end	Night	6% 1 7% 32% 45% 9%	591
August	1st to 10th	Night	3 1 6% 36% 46% 9%	537
	11th to 20th	Night	8% 1 7% 35% 42% 7%	534
	21st to end	Night	7% 1 6% 26% 51% 8%	594
September	1st to 10th	Night	8% 2 7% 32% 47% 5%	540
	11th to 20th	Night	10% 2 10% 30% 43% 5%	540
	21st to end	Night	10% 2 13% 35% 37% 4	666
October	1st to 10th	Night	11% 2 15% 35% 34% 3	720
	11th to 20th	Night	13% 4 27% 37% 19% 1	720
	21st to end	Night	20% 5% 26% 31% 17% 1	792
November	1st to 10th	Night	12% 4 28% 37% 18% 1	740
	11th to 20th	Night	13% 8% 30% 37% 12%	760
	21st to end	Night	19% 7% 29% 31% 12% 1	760
December	1st to 10th	Night	21% 8% 30% 35% 7%	947
	11th to 20th	Night	23% 6% 29% 35% 7%	950
	21st to end	Night	23% 9% 33% 30% 4	1045

Page generated at 2024-01-28 04:26:35. Version ac07

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