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 2024-09-14.

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% 2 6% 4 4 4 3 5% 7% 46%	100238
	Night	13% 5% 2 5% 4 3 3 3 5% 6% 50%	97712
Transparency	Day	37% 6% 10% 24% 18% 4	100046
	Night	35% 5% 10% 24% 22% 5%	97576
Seeing	Day	14% 7% 21% 26% 22% 9%	15214
	Night	15% 5% 25% 33% 19% 2	24953

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	18% 7% 3 6% 3 4 3 2 4 4 45%	2847
	11th to 20th	Day	15% 8% 2 6% 4 3 3 2 3 5% 48%	2850
	21st to end	Day	25% 6% 2 4 2 2 2 2 3 4 46%	3135
February	1st to 10th	Day	20% 8% 3 6% 4 3 3 3 5% 4 42%	1710
	11th to 20th	Day	18% 6% 2 7% 5% 3 4 3 5% 5% 43%	1830
	21st to end	Day	22% 9% 2 5% 4 4 4 3 4 5% 37%	1570
March	1st to 10th	Day	21% 10% 3 7% 4 4 3 2 4 4 38%	3406
	11th to 20th	Day	13% 7% 2 6% 5% 3 4 2 4 5% 48%	3480
	21st to end	Day	15% 8% 3 7% 4 4 4 3 4 4 44%	3891
April	1st to 10th	Day	15% 5% 2 5% 4 4 3 3 5% 6% 46%	2280
	11th to 20th	Day	15% 6% 3 7% 4 5% 3 3 4 6% 44%	2254
	21st to end	Day	16% 6% 3 5% 5% 5% 5% 3 5% 6% 41%	2280
May	1st to 10th	Day	15% 7% 3 7% 5% 5% 4 4 6% 6% 38%	3765
	11th to 20th	Day	13% 5% 2 6% 4 4 5% 4 6% 9% 42%	3949
	21st to end	Day	11% 7% 3 8% 5% 5% 5% 5% 7% 8% 35%	4716
June	1st to 10th	Day	7% 4 2 5% 5% 5% 5% 6% 7% 9% 44%	2660
	11th to 20th	Day	5% 4 2 4 5% 4 5% 4 9% 11% 48%	2660
	21st to end	Day	4 4 1 4 5% 5% 4 5% 7% 9% 51%	2660
July	1st to 10th	Day	8% 5% 2 6% 4 5% 6% 5% 7% 10% 43%	4186
	11th to 20th	Day	6% 4 2 4 4 4 5% 4 6% 9% 54%	4120
	21st to end	Day	12% 7% 3 9% 6% 5% 5% 4 7% 8% 35%	4465
August	1st to 10th	Day	3 2 1 4 3 3 4 3 6% 8% 62%	4053
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 5% 6% 9% 44%	3729
	21st to end	Day	6% 4 2 4 4 4 5% 5% 7% 8% 53%	4180
September	1st to 10th	Day	10% 5% 2 5% 5% 5% 5% 4 6% 7% 46%	2280
	11th to 20th	Day	13% 5% 2 5% 4 3 4 3 5% 8% 47%	2197
	21st to end	Day	9% 5% 1 4 4 3 3 3 4 6% 56%	1915
October	1st to 10th	Day	10% 3 2 4 3 3 3 3 5% 6% 57%	1800
	11th to 20th	Day	13% 5% 2 4 3 3 4 2 3 6% 55%	1800
	21st to end	Day	19% 5% 2 4 2 3 3 3 4 6% 50%	1980
November	1st to 10th	Day	12% 6% 2 4 3 3 2 3 3 5% 57%	1858
	11th to 20th	Day	11% 6% 2 6% 3 3 3 3 5% 7% 53%	1728
	21st to end	Day	21% 6% 2 6% 4 3 3 3 4 5% 44%	1710
December	1st to 10th	Day	20% 6% 2 5% 3 4 3 3 4 5% 47%	1520
	11th to 20th	Day	17% 8% 3 6% 4 4 3 3 4 5% 43%	1918
	21st to end	Day	16% 7% 3 7% 6% 5% 4 3 5% 5% 39%	2856
January	1st to 10th	Night	17% 6% 2 5% 4 4 3 3 4 5% 46%	4108
	11th to 20th	Night	17% 6% 2 4 3 3 3 2 3 4 53%	4120
	21st to end	Night	25% 7% 2 4 3 2 2 2 3 3 47%	4532
February	1st to 10th	Night	21% 8% 2 5% 4 3 3 3 4 4 42%	2470
	11th to 20th	Night	19% 7% 2 5% 4 3 2 3 3 6% 46%	2233
	21st to end	Night	19% 6% 2 6% 4 4 3 2 4 4 46%	1884
March	1st to 10th	Night	21% 8% 2 6% 3 3 3 3 5% 4 41%	3463
	11th to 20th	Night	14% 6% 2 5% 4 3 3 3 3 5% 51%	3480
	21st to end	Night	13% 6% 2 7% 5% 4 4 3 5% 7% 45%	3738
April	1st to 10th	Night	11% 6% 2 5% 3 3 3 3 5% 8% 50%	1900
	11th to 20th	Night	13% 5% 2 4 3 4 4 3 5% 8% 50%	1875
	21st to end	Night	14% 5% 3 5% 4 3 4 3 5% 6% 47%	1900
May	1st to 10th	Night	18% 7% 3 6% 4 4 3 3 5% 8% 39%	3130
	11th to 20th	Night	15% 6% 3 5% 4 3 3 3 5% 7% 45%	2947
	21st to end	Night	12% 6% 2 7% 5% 5% 6% 4 6% 8% 39%	2847
June	1st to 10th	Night	6% 4 1 5% 3 4 5% 5% 7% 12% 48%	1520
	11th to 20th	Night	2 3 1 3 4 4 4 3 7% 8% 61%	1520
	21st to end	Night	3 3 1 3 3 3 4 4 6% 9% 59%	1520
July	1st to 10th	Night	6% 4 1 4 4 4 5% 4 7% 11% 49%	2777
	11th to 20th	Night	5% 3 1 4 3 3 3 4 6% 11% 56%	2850
	21st to end	Night	11% 7% 4 7% 4 4 5% 4 5% 7% 42%	3098
August	1st to 10th	Night	1 2 1 3 2 2 3 3 6% 8% 67%	2883
	11th to 20th	Night	4 3 1 4 3 4 4 4 7% 10% 55%	3100
	21st to end	Night	4 3 1 4 3 4 4 3 6% 9% 58%	3476
September	1st to 10th	Night	8% 4 2 5% 3 4 3 3 5% 8% 54%	1900
	11th to 20th	Night	10% 4 2 5% 4 4 4 4 5% 6% 52%	1840
	21st to end	Night	8% 4 2 3 3 3 3 3 5% 6% 60%	2023
October	1st to 10th	Night	8% 4 1 4 2 3 3 3 5% 7% 60%	2160
	11th to 20th	Night	11% 5% 2 4 3 3 3 2 4 5% 59%	2160
	21st to end	Night	18% 5% 2 4 4 3 3 2 3 4 53%	2376
November	1st to 10th	Night	10% 5% 2 5% 3 2 3 3 5% 5% 58%	2220
	11th to 20th	Night	13% 3 1 4 3 2 3 2 4 6% 56%	2450
	21st to end	Night	16% 6% 2 5% 3 4 3 3 4 5% 49%	2470
December	1st to 10th	Night	19% 6% 2 5% 4 4 3 3 4 4 47%	2657
	11th to 20th	Night	17% 6% 2 7% 5% 3 3 2 3 4 49%	3279
	21st to end	Night	17% 7% 3 7% 5% 4 4 3 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 5% 26% 19% 3	2848
	11th to 20th	Day	40% 2 8% 25% 22% 2	2850
	21st to end	Day	44% 2 7% 19% 24% 4	3135
February	1st to 10th	Day	46% 4 10% 22% 16% 3	1710
	11th to 20th	Day	44% 4 8% 20% 18% 5%	1840
	21st to end	Day	50% 4 8% 16% 15% 8%	1570
March	1st to 10th	Day	50% 5% 7% 13% 16% 10%	3406
	11th to 20th	Day	40% 4 8% 25% 19% 4	3480
	21st to end	Day	45% 4 8% 22% 20% 1	3891
April	1st to 10th	Day	38% 5% 8% 23% 22% 3	2280
	11th to 20th	Day	41% 5% 8% 22% 18% 6%	2254
	21st to end	Day	42% 6% 9% 22% 18% 2	2280
May	1st to 10th	Day	43% 8% 11% 21% 15% 2	3800
	11th to 20th	Day	37% 9% 15% 25% 13% 1	3953
	21st to end	Day	42% 8% 13% 24% 12% 1	4729
June	1st to 10th	Day	35% 8% 13% 26% 17% 1	2660
	11th to 20th	Day	28% 8% 15% 29% 18% 3	2660
	21st to end	Day	27% 8% 13% 26% 21% 4	2660
July	1st to 10th	Day	33% 9% 15% 28% 14% 2	4122
	11th to 20th	Day	26% 7% 11% 34% 19% 3	4051
	21st to end	Day	46% 8% 13% 25% 8%	4325
August	1st to 10th	Day	19% 6% 16% 33% 22% 4	4039
	11th to 20th	Day	36% 6% 15% 30% 12% 1	3765
	21st to end	Day	26% 8% 13% 31% 20% 3	4179
September	1st to 10th	Day	35% 7% 10% 22% 17% 8%	2280
	11th to 20th	Day	36% 6% 10% 18% 25% 6%	2197
	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	41% 3 5% 22% 26% 3	4108
	11th to 20th	Night	37% 4 9% 23% 24% 4	4120
	21st to end	Night	43% 3 10% 20% 21% 4	4532
February	1st to 10th	Night	47% 3 7% 20% 18% 5%	2470
	11th to 20th	Night	43% 3 7% 22% 19% 6%	2234
	21st to end	Night	42% 4 7% 18% 20% 8%	1884
March	1st to 10th	Night	45% 5% 7% 15% 18% 11%	3463
	11th to 20th	Night	37% 5% 8% 26% 20% 6%	3480
	21st to end	Night	39% 4 9% 26% 20% 2	3738
April	1st to 10th	Night	33% 4 11% 24% 20% 7%	1900
	11th to 20th	Night	34% 4 9% 23% 21% 9%	1875
	21st to end	Night	37% 5% 10% 24% 21% 3	1900
May	1st to 10th	Night	43% 7% 11% 22% 13% 3	3160
	11th to 20th	Night	39% 6% 15% 24% 16% 2	2948
	21st to end	Night	41% 8% 13% 22% 14% 2	2855
June	1st to 10th	Night	27% 7% 13% 29% 21% 3	1520
	11th to 20th	Night	20% 5% 14% 32% 25% 5%	1520
	21st to end	Night	20% 6% 14% 30% 23% 7%	1520
July	1st to 10th	Night	27% 9% 17% 27% 18% 2	2732
	11th to 20th	Night	20% 7% 12% 34% 22% 4	2796
	21st to end	Night	41% 7% 11% 26% 15%	2999
August	1st to 10th	Night	14% 5% 16% 38% 23% 4	2873
	11th to 20th	Night	22% 8% 19% 33% 16% 2	3130
	21st to end	Night	22% 7% 11% 28% 28% 4	3476
September	1st to 10th	Night	30% 5% 10% 25% 20% 10%	1900
	11th to 20th	Night	32% 6% 9% 22% 25% 7%	1840
	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% 39% 24% 6%	297
February	1st to 10th	Day	24% 12% 37% 19% 7% 1	270
	11th to 20th	Day	22% 21% 35% 18% 3	270
	21st to end	Day	35% 17% 31% 12% 4	225
March	1st to 10th	Day	25% 13% 33% 21% 7% 1	270
	11th to 20th	Day	24% 17% 35% 20% 3	270
	21st to end	Day	20% 18% 38% 18% 6% 1	336
April	1st to 10th	Day	17% 13% 33% 27% 9% 1	460
	11th to 20th	Day	19% 10% 36% 25% 8% 2	452
	21st to end	Day	18% 11% 34% 23% 12% 2	460
May	1st to 10th	Day	16% 11% 28% 32% 11% 1	463
	11th to 20th	Day	14% 5% 23% 31% 20% 7%	594
	21st to end	Day	9% 4 21% 34% 23% 9%	734
June	1st to 10th	Day	9% 4 12% 30% 30% 14%	680
	11th to 20th	Day	6% 3 10% 33% 34% 15%	680
	21st to end	Day	4 2 16% 33% 30% 15%	680
July	1st to 10th	Day	6% 1 11% 27% 37% 18%	671
	11th to 20th	Day	5% 1 8% 30% 37% 18%	668
	21st to end	Day	8% 3 8% 26% 38% 17%	739
August	1st to 10th	Day	5% 2 9% 30% 38% 15%	651
	11th to 20th	Day	14% 1 10% 25% 35% 16%	479
	21st to end	Day	10% 2 5% 19% 39% 26%	539
September	1st to 10th	Day	10% 2 9% 22% 40% 17%	490
	11th to 20th	Day	11% 1 12% 23% 31% 22%	463
	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	1045
February	1st to 10th	Night	25% 8% 34% 28% 5%	950
	11th to 20th	Night	23% 8% 37% 28% 3	758
	21st to end	Night	23% 13% 37% 25% 2	628
March	1st to 10th	Night	22% 7% 32% 33% 5%	603
	11th to 20th	Night	22% 9% 34% 31% 4 1	570
	21st to end	Night	19% 9% 33% 30% 8%	627
April	1st to 10th	Night	14% 9% 37% 32% 8%	570
	11th to 20th	Night	14% 9% 32% 34% 10% 1	563
	21st to end	Night	14% 6% 35% 32% 11% 1	570
May	1st to 10th	Night	16% 6% 23% 41% 14% 1	570
	11th to 20th	Night	15% 5% 26% 34% 18% 3	561
	21st to end	Night	9% 4 19% 38% 25% 5%	617
June	1st to 10th	Night	7% 2 12% 38% 36% 6%	570
	11th to 20th	Night	2 1 7% 46% 40% 4	570
	21st to end	Night	4 11% 37% 42% 6%	570
July	1st to 10th	Night	4 2 6% 35% 43% 10%	555
	11th to 20th	Night	5% 1 7% 30% 48% 9%	552
	21st to end	Night	7% 1 7% 32% 44% 9%	624
August	1st to 10th	Night	3 1 6% 36% 46% 9%	567
	11th to 20th	Night	8% 1 7% 36% 42% 7%	564
	21st to end	Night	7% 1 6% 27% 50% 8%	627
September	1st to 10th	Night	8% 2 8% 33% 45% 5%	570
	11th to 20th	Night	11% 2 10% 30% 42% 5%	552
	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 2024-09-11 09:00:02. Version ac07

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