Emporia
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Emporia clear sky chart from 2005-11-06 to 2025-10-04.

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	11% 6% 2 6% 4 4 4 3 5% 7% 48%	126626
	Night	10% 6% 2 5% 4 3 4 3 5% 7% 51%	123044
Transparency	Day	35% 5% 11% 26% 20% 4	130277
	Night	32% 4 11% 27% 21% 5%	127456
Seeing	Day	13% 9% 29% 29% 16% 3	16900
	Night	13% 9% 33% 33% 11% 1	26673

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	14% 8% 2 10% 5% 4 4 3 5% 6% 39%	4077
	11th to 20th	Day	7% 9% 4 9% 6% 6% 5% 3 4 5% 42%	4080
	21st to end	Day	9% 11% 5% 7% 4 4 4 3 4 5% 45%	4488
February	1st to 10th	Day	12% 12% 4 7% 4 5% 3 3 4 6% 41%	1800
	11th to 20th	Day	9% 8% 4 9% 5% 4 4 3 5% 5% 44%	1855
	21st to end	Day	10% 8% 2 6% 4 4 4 4 5% 7% 47%	1650
March	1st to 10th	Day	10% 7% 2 6% 3 3 3 3 4 5% 54%	4933
	11th to 20th	Day	10% 5% 1 4 3 2 3 2 4 6% 59%	4980
	21st to end	Day	12% 8% 4 7% 4 5% 4 4 5% 7% 40%	5462
April	1st to 10th	Day	12% 7% 2 5% 3 3 3 3 5% 6% 49%	2225
	11th to 20th	Day	14% 8% 2 6% 5% 4 5% 3 4 6% 44%	2422
	21st to end	Day	18% 7% 3 7% 4 4 4 3 5% 6% 39%	2600
May	1st to 10th	Day	17% 8% 2 6% 3 3 3 2 4 6% 44%	5862
	11th to 20th	Day	12% 6% 2 5% 3 3 3 3 5% 6% 51%	5862
	21st to end	Day	20% 6% 2 6% 4 4 4 3 6% 7% 40%	6434
June	1st to 10th	Day	6% 4 1 5% 4 4 5% 4 6% 10% 53%	2600
	11th to 20th	Day	8% 5% 2 6% 5% 4 4 4 6% 8% 49%	2600
	21st to end	Day	5% 3 2 4 4 4 4 4 7% 8% 55%	2600
July	1st to 10th	Day	9% 5% 2 6% 4 5% 6% 4 7% 9% 44%	5900
	11th to 20th	Day	9% 4 2 5% 4 4 5% 4 6% 8% 49%	5900
	21st to end	Day	7% 4 2 6% 5% 5% 6% 5% 7% 9% 44%	6422
August	1st to 10th	Day	6% 4 2 6% 4 4 4 4 5% 7% 54%	4234
	11th to 20th	Day	10% 5% 2 6% 5% 4 4 4 5% 7% 48%	4171
	21st to end	Day	5% 4 2 4 4 4 4 3 6% 8% 57%	4520
September	1st to 10th	Day	13% 4 1 4 3 3 4 4 5% 6% 53%	2273
	11th to 20th	Day	9% 5% 2 6% 4 4 4 3 6% 6% 51%	2200
	21st to end	Day	9% 4 2 5% 4 4 4 3 5% 6% 54%	2200
October	1st to 10th	Day	9% 4 2 5% 3 4 4 3 5% 6% 55%	1995
	11th to 20th	Day	11% 5% 1 4 2 2 2 3 4 6% 60%	1900
	21st to end	Day	14% 6% 2 5% 3 2 3 3 5% 5% 52%	2090
November	1st to 10th	Day	8% 5% 2 4 3 3 3 3 4 7% 58%	1872
	11th to 20th	Day	10% 6% 2 5% 3 3 2 2 4 7% 56%	1800
	21st to end	Day	14% 7% 2 5% 2 2 3 2 4 5% 56%	1800
December	1st to 10th	Day	6% 4 2 4 3 3 3 3 4 7% 61%	2940
	11th to 20th	Day	9% 7% 3 6% 4 4 3 2 3 5% 55%	3391
	21st to end	Day	17% 13% 7% 11% 4 4 3 3 4 5% 30%	4488
January	1st to 10th	Night	12% 9% 3 11% 4 4 3 3 5% 6% 40%	5888
	11th to 20th	Night	7% 6% 3 7% 5% 5% 5% 3 4 6% 49%	5900
	21st to end	Night	12% 10% 3 6% 4 3 3 3 4 5% 47%	6490
February	1st to 10th	Night	10% 10% 3 7% 5% 4 3 3 5% 5% 44%	2600
	11th to 20th	Night	12% 8% 2 6% 4 4 3 3 4 6% 46%	2449
	21st to end	Night	10% 6% 2 6% 3 4 4 4 5% 6% 51%	1980
March	1st to 10th	Night	12% 6% 2 5% 3 2 2 2 3 5% 56%	4921
	11th to 20th	Night	7% 4 1 3 3 3 4 4 6% 7% 59%	4980
	21st to end	Night	12% 7% 2 5% 4 4 4 4 6% 7% 45%	5467
April	1st to 10th	Night	11% 5% 2 5% 3 4 4 3 4 6% 53%	2175
	11th to 20th	Night	12% 7% 3 6% 3 3 3 3 5% 6% 50%	1924
	21st to end	Night	15% 6% 2 6% 4 4 4 3 6% 7% 44%	1800
May	1st to 10th	Night	17% 7% 2 4 3 3 3 3 5% 6% 46%	4053
	11th to 20th	Night	14% 6% 2 5% 2 3 3 2 4 6% 52%	4053
	21st to end	Night	19% 5% 1 4 3 2 3 3 4 7% 50%	4443
June	1st to 10th	Night	6% 3 1 3 5% 3 5% 4 6% 11% 53%	1800
	11th to 20th	Night	5% 4 1 4 5% 3 4 4 7% 11% 51%	1800
	21st to end	Night	5% 3 1 4 4 4 4 4 5% 8% 58%	1800
July	1st to 10th	Night	7% 5% 2 5% 4 3 4 3 6% 9% 53%	4078
	11th to 20th	Night	5% 3 2 4 4 4 4 4 6% 10% 54%	4077
	21st to end	Night	8% 4 2 6% 5% 4 4 4 7% 9% 46%	4449
August	1st to 10th	Night	3 3 1 5% 4 4 5% 4 7% 8% 56%	2926
	11th to 20th	Night	9% 4 2 5% 4 4 4 4 6% 7% 51%	2888
	21st to end	Night	5% 2 1 4 3 3 3 3 5% 7% 64%	3381
September	1st to 10th	Night	10% 5% 1 4 3 3 3 3 4 6% 58%	2123
	11th to 20th	Night	9% 4 2 5% 3 4 4 4 5% 7% 53%	2200
	21st to end	Night	6% 5% 1 4 4 3 3 3 5% 6% 60%	2200
October	1st to 10th	Night	10% 4 2 4 3 3 3 3 5% 7% 56%	2230
	11th to 20th	Night	11% 5% 2 4 2 2 3 2 4 5% 61%	2280
	21st to end	Night	13% 6% 2 4 2 3 3 3 4 5% 55%	2508
November	1st to 10th	Night	9% 5% 1 4 3 2 3 2 3 5% 62%	2425
	11th to 20th	Night	9% 5% 1 4 3 3 2 3 5% 7% 57%	2600
	21st to end	Night	12% 7% 2 4 2 2 3 2 5% 5% 56%	2600
December	1st to 10th	Night	5% 5% 1 4 3 3 3 3 5% 5% 62%	4250
	11th to 20th	Night	10% 6% 2 5% 3 3 4 3 5% 7% 52%	4816
	21st to end	Night	18% 12% 5% 8% 4 4 3 3 4 4 35%	6490

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	46% 4 11% 24% 14% 2	4078
	11th to 20th	Day	44% 4 10% 21% 17% 3	4080
	21st to end	Day	42% 3 10% 24% 16% 5%	4488
February	1st to 10th	Day	45% 5% 11% 25% 11% 4	1800
	11th to 20th	Day	42% 4 11% 25% 15% 4	1864
	21st to end	Day	37% 4 9% 24% 19% 6%	1650
March	1st to 10th	Day	32% 3 7% 21% 24% 13%	4933
	11th to 20th	Day	27% 3 9% 22% 26% 12%	4980
	21st to end	Day	42% 5% 12% 31% 9% 1	5464
April	1st to 10th	Day	36% 5% 11% 24% 20% 4	2225
	11th to 20th	Day	42% 5% 10% 23% 17% 3	2422
	21st to end	Day	46% 5% 11% 27% 12% 1	2600
May	1st to 10th	Day	43% 6% 9% 21% 19% 2	5900
	11th to 20th	Day	33% 4 9% 21% 27% 5%	5866
	21st to end	Day	43% 7% 10% 23% 16% 2	6447
June	1st to 10th	Day	27% 7% 16% 31% 17% 3	2600
	11th to 20th	Day	32% 5% 13% 28% 19% 3	2600
	21st to end	Day	25% 6% 15% 29% 20% 5%	2600
July	1st to 10th	Day	33% 7% 11% 25% 20% 3	5836
	11th to 20th	Day	30% 7% 12% 30% 19% 3	5831
	21st to end	Day	32% 8% 15% 30% 14% 1	6240
August	1st to 10th	Day	29% 6% 11% 27% 21% 6%	4220
	11th to 20th	Day	34% 6% 14% 27% 17% 2	4210
	21st to end	Day	24% 6% 15% 32% 18% 5%	4519
September	1st to 10th	Day	31% 5% 13% 24% 19% 7%	2273
	11th to 20th	Day	31% 6% 10% 29% 22% 3	2200
	21st to end	Day	31% 5% 8% 24% 28% 4	2200
October	1st to 10th	Day	20% 3 8% 18% 41% 10%	3294
	11th to 20th	Day	16% 2 6% 32% 32% 12%	3140
	21st to end	Day	27% 3 9% 26% 28% 6%	3428
November	1st to 10th	Day	28% 4 10% 30% 21% 7%	1872
	11th to 20th	Day	30% 3 9% 28% 26% 5%	1800
	21st to end	Day	33% 2 10% 29% 23% 3	1800
December	1st to 10th	Day	25% 4 11% 40% 21% 1	2940
	11th to 20th	Day	34% 3 8% 35% 19% 2	3389
	21st to end	Day	58% 3 8% 22% 8% 1	4488
January	1st to 10th	Night	46% 3 10% 25% 14% 2	5888
	11th to 20th	Night	36% 4 10% 24% 21% 4	5900
	21st to end	Night	40% 3 9% 22% 20% 6%	6490
February	1st to 10th	Night	42% 5% 11% 24% 14% 4	2600
	11th to 20th	Night	39% 5% 11% 25% 17% 3	2450
	21st to end	Night	33% 5% 7% 24% 22% 9%	1980
March	1st to 10th	Night	32% 3 6% 25% 26% 8%	4921
	11th to 20th	Night	24% 4 8% 18% 35% 12%	4980
	21st to end	Night	38% 5% 14% 29% 12% 2	5467
April	1st to 10th	Night	33% 4 11% 23% 24% 6%	2175
	11th to 20th	Night	34% 5% 11% 26% 21% 4	1924
	21st to end	Night	38% 6% 13% 24% 16% 3	1800
May	1st to 10th	Night	38% 6% 11% 25% 17% 3	4080
	11th to 20th	Night	33% 5% 11% 25% 19% 7%	4054
	21st to end	Night	36% 5% 13% 27% 18% 2	4452
June	1st to 10th	Night	24% 8% 19% 30% 15% 3	1800
	11th to 20th	Night	26% 6% 16% 31% 19% 3	1800
	21st to end	Night	24% 5% 14% 31% 21% 5%	1800
July	1st to 10th	Night	28% 6% 14% 26% 22% 4	4035
	11th to 20th	Night	25% 6% 13% 33% 21% 2	4026
	21st to end	Night	32% 8% 13% 34% 13%	4320
August	1st to 10th	Night	24% 6% 16% 26% 19% 9%	2916
	11th to 20th	Night	31% 6% 15% 26% 20% 2	2915
	21st to end	Night	20% 5% 13% 38% 19% 5%	3381
September	1st to 10th	Night	28% 4 11% 27% 21% 9%	2123
	11th to 20th	Night	30% 6% 10% 26% 24% 5%	2200
	21st to end	Night	26% 4 9% 24% 31% 6%	2200
October	1st to 10th	Night	19% 3 7% 16% 46% 9%	3698
	11th to 20th	Night	18% 3 5% 28% 33% 14%	3779
	21st to end	Night	27% 3 8% 26% 32% 4	4120
November	1st to 10th	Night	27% 3 9% 30% 24% 8%	2425
	11th to 20th	Night	27% 3 9% 28% 26% 6%	2600
	21st to end	Night	31% 3 10% 29% 22% 5%	2600
December	1st to 10th	Night	25% 3 14% 37% 21% 1	4250
	11th to 20th	Night	32% 3 11% 30% 20% 3	4817
	21st to end	Night	51% 3 9% 24% 10% 2	6490

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	18% 15% 33% 26% 9%	300
	11th to 20th	Day	19% 16% 43% 18% 4	300
	21st to end	Day	10% 14% 45% 27% 4	330
February	1st to 10th	Day	21% 19% 39% 18% 2 1	300
	11th to 20th	Day	18% 17% 40% 19% 6%	300
	21st to end	Day	13% 23% 43% 18% 2 1	249
March	1st to 10th	Day	16% 19% 41% 21% 3	300
	11th to 20th	Day	25% 12% 39% 19% 6% 1	300
	21st to end	Day	25% 22% 35% 15% 2 1	330
April	1st to 10th	Day	22% 19% 38% 16% 5%	325
	11th to 20th	Day	19% 15% 41% 21% 4 1	540
	21st to end	Day	23% 13% 38% 19% 6% 1	700
May	1st to 10th	Day	18% 14% 34% 24% 8% 1	703
	11th to 20th	Day	19% 11% 27% 27% 14% 2	725
	21st to end	Day	19% 9% 30% 24% 15% 3	789
June	1st to 10th	Day	6% 3 24% 35% 25% 6%	730
	11th to 20th	Day	8% 4 28% 38% 18% 4	730
	21st to end	Day	5% 5% 34% 39% 15% 1	730
July	1st to 10th	Day	10% 2 15% 34% 29% 8%	721
	11th to 20th	Day	5% 3 17% 43% 26% 6%	718
	21st to end	Day	8% 3 14% 36% 30% 9%	794
August	1st to 10th	Day	7% 3 21% 37% 29% 4	726
	11th to 20th	Day	8% 2 16% 40% 28% 6%	715
	21st to end	Day	10% 2 13% 32% 36% 8%	713
September	1st to 10th	Day	13% 2 12% 40% 27% 6%	403
	11th to 20th	Day	6% 3 21% 39% 25% 6%	330
	21st to end	Day	13% 4 26% 33% 20% 5%	330
October	1st to 10th	Day	11% 7% 30% 28% 16% 7%	309
	11th to 20th	Day	8% 15% 42% 26% 9%	300
	21st to end	Day	19% 15% 35% 22% 7% 2	330
November	1st to 10th	Day	14% 12% 34% 29% 10% 2	300
	11th to 20th	Day	16% 19% 33% 20% 10% 2	300
	21st to end	Day	20% 12% 37% 21% 11%	300
December	1st to 10th	Day	9% 11% 45% 25% 7% 4	300
	11th to 20th	Day	15% 13% 40% 24% 7% 1	300
	21st to end	Day	19% 20% 40% 19% 3	330
January	1st to 10th	Night	12% 11% 40% 30% 6%	1000
	11th to 20th	Night	13% 14% 38% 29% 5% 1	1000
	21st to end	Night	12% 12% 40% 31% 4	1100
February	1st to 10th	Night	16% 12% 43% 27% 3	1000
	11th to 20th	Night	16% 15% 38% 27% 3	895
	21st to end	Night	13% 15% 42% 26% 4	660
March	1st to 10th	Night	15% 11% 44% 26% 5%	602
	11th to 20th	Night	17% 11% 38% 27% 7%	600
	21st to end	Night	21% 14% 41% 20% 4	660
April	1st to 10th	Night	15% 13% 44% 22% 6%	600
	11th to 20th	Night	17% 17% 35% 27% 5%	593
	21st to end	Night	17% 13% 40% 23% 7% 1	600
May	1st to 10th	Night	17% 10% 34% 32% 8%	600
	11th to 20th	Night	15% 8% 31% 32% 14%	591
	21st to end	Night	14% 6% 32% 32% 15% 2	650
June	1st to 10th	Night	7% 3 26% 41% 22% 1	600
	11th to 20th	Night	6% 4 31% 43% 17%	600
	21st to end	Night	6% 3 35% 46% 10%	600
July	1st to 10th	Night	7% 2 17% 44% 28% 2	585
	11th to 20th	Night	3 1 18% 51% 24% 2	582
	21st to end	Night	8% 3 14% 44% 30% 1	657
August	1st to 10th	Night	6% 2 19% 47% 25% 1	597
	11th to 20th	Night	6% 3 16% 48% 26% 1	594
	21st to end	Night	7% 1 14% 45% 31% 2	660
September	1st to 10th	Night	12% 3 18% 43% 22% 2	600
	11th to 20th	Night	9% 3 25% 39% 21% 3	600
	21st to end	Night	9% 5% 24% 41% 20% 2	600
October	1st to 10th	Night	12% 6% 26% 34% 21% 1	686
	11th to 20th	Night	13% 9% 39% 31% 8%	760
	21st to end	Night	17% 10% 35% 29% 8%	836
November	1st to 10th	Night	11% 10% 34% 32% 13% 1	865
	11th to 20th	Night	11% 14% 38% 29% 7%	1000
	21st to end	Night	16% 12% 33% 33% 7%	1000
December	1st to 10th	Night	14% 10% 38% 32% 6%	1000
	11th to 20th	Night	16% 12% 37% 30% 5%	1000
	21st to end	Night	16% 14% 36% 29% 4	1100

Page generated at 2025-10-01 00:39:06. Version ac07

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