Aurora(MO)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Aurora(MO) clear sky chart from 2005-11-06 to 2026-03-03.

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	12% 7% 3 6% 4 4 4 3 5% 7% 45%	130744
	Night	11% 7% 3 6% 4 3 3 3 5% 6% 49%	130693
Transparency	Day	37% 6% 11% 25% 17% 4	134355
	Night	35% 5% 10% 25% 20% 5%	135159
Seeing	Day	14% 10% 26% 27% 17% 5%	17253
	Night	14% 11% 31% 30% 14% 1	27221

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	13% 10% 4 6% 4 4 4 3 4 5% 44%	5289
	11th to 20th	Day	7% 8% 4 7% 5% 4 4 3 4 6% 49%	5310
	21st to end	Day	15% 10% 3 7% 3 3 3 2 4 5% 46%	5812
February	1st to 10th	Day	16% 11% 3 8% 5% 4 4 3 4 5% 38%	1890
	11th to 20th	Day	14% 9% 3 8% 4 4 4 2 4 5% 43%	1844
	21st to end	Day	15% 8% 3 7% 4 4 4 3 6% 6% 40%	1851
March	1st to 10th	Day	13% 9% 3 5% 3 3 4 3 4 6% 48%	4958
	11th to 20th	Day	10% 7% 2 4 4 3 3 3 5% 7% 54%	4980
	21st to end	Day	14% 8% 4 8% 5% 5% 5% 4 5% 7% 35%	5462
April	1st to 10th	Day	13% 7% 3 6% 3 4 4 3 5% 7% 44%	2344
	11th to 20th	Day	16% 8% 2 7% 4 4 3 4 4 6% 41%	2374
	21st to end	Day	19% 9% 3 7% 5% 4 4 3 5% 5% 37%	2400
May	1st to 10th	Day	18% 8% 2 7% 5% 4 4 4 5% 6% 36%	5848
	11th to 20th	Day	11% 6% 2 7% 5% 5% 5% 4 6% 8% 41%	5862
	21st to end	Day	20% 6% 2 6% 4 5% 5% 4 5% 7% 37%	6434
June	1st to 10th	Day	9% 4 2 6% 4 5% 4 4 6% 10% 46%	2780
	11th to 20th	Day	8% 4 2 5% 5% 4 5% 4 7% 9% 47%	2800
	21st to end	Day	6% 2 2 4 3 4 5% 4 7% 9% 54%	2682
July	1st to 10th	Day	9% 4 2 6% 4 5% 5% 4 7% 9% 43%	5900
	11th to 20th	Day	8% 5% 3 6% 5% 5% 5% 4 7% 9% 45%	5900
	21st to end	Day	6% 4 2 4 4 5% 5% 5% 7% 10% 48%	6422
August	1st to 10th	Day	5% 3 2 5% 4 4 5% 3 5% 8% 56%	4234
	11th to 20th	Day	9% 4 2 6% 5% 5% 5% 4 6% 8% 45%	4091
	21st to end	Day	7% 4 1 5% 3 4 4 3 6% 8% 55%	4312
September	1st to 10th	Day	11% 5% 2 5% 4 3 4 3 6% 6% 51%	2400
	11th to 20th	Day	11% 6% 2 7% 5% 4 4 4 6% 7% 45%	2290
	21st to end	Day	8% 4 2 5% 5% 4 5% 3 6% 7% 52%	2144
October	1st to 10th	Day	10% 4 2 5% 3 3 3 4 4 6% 56%	2000
	11th to 20th	Day	13% 6% 2 5% 2 3 2 3 3 4 57%	2000
	21st to end	Day	18% 7% 2 4 3 3 3 2 3 5% 50%	2200
November	1st to 10th	Day	11% 6% 2 5% 3 3 3 2 3 6% 57%	2058
	11th to 20th	Day	13% 7% 2 5% 3 3 3 3 5% 6% 49%	1994
	21st to end	Day	15% 9% 3 6% 3 3 2 2 3 6% 48%	1680
December	1st to 10th	Day	10% 8% 3 6% 3 3 3 2 3 5% 53%	2690
	11th to 20th	Day	9% 10% 3 6% 4 4 3 2 4 5% 50%	3088
	21st to end	Day	16% 19% 5% 9% 4 3 3 3 4 4 28%	4421
January	1st to 10th	Night	12% 9% 4 10% 6% 4 4 2 3 5% 41%	7634
	11th to 20th	Night	7% 6% 2 8% 5% 4 4 3 4 6% 52%	7680
	21st to end	Night	14% 10% 4 7% 4 4 3 3 3 5% 43%	8402
February	1st to 10th	Night	14% 10% 4 6% 4 3 3 3 4 6% 43%	2730
	11th to 20th	Night	15% 8% 3 8% 5% 3 3 3 4 6% 44%	2660
	21st to end	Night	13% 8% 3 6% 5% 3 4 3 5% 5% 46%	1972
March	1st to 10th	Night	13% 11% 4 6% 4 4 3 2 4 4 46%	4941
	11th to 20th	Night	9% 7% 2 5% 3 3 3 3 5% 6% 54%	4980
	21st to end	Night	10% 7% 3 6% 5% 5% 4 4 6% 7% 43%	5467
April	1st to 10th	Night	11% 6% 2 4 3 3 3 3 6% 7% 51%	2055
	11th to 20th	Night	13% 7% 2 4 4 3 4 3 5% 6% 48%	1975
	21st to end	Night	18% 7% 3 6% 4 3 4 4 6% 7% 40%	2000
May	1st to 10th	Night	15% 9% 3 6% 3 3 3 3 4 6% 45%	4063
	11th to 20th	Night	12% 6% 2 7% 4 4 4 3 6% 8% 44%	4053
	21st to end	Night	17% 8% 2 6% 4 3 4 3 5% 7% 41%	4443
June	1st to 10th	Night	8% 4 1 5% 4 3 4 4 7% 9% 52%	1610
	11th to 20th	Night	6% 2 1 3 4 4 5% 4 6% 11% 54%	1600
	21st to end	Night	3 3 1 3 3 4 4 3 4 8% 63%	1708
July	1st to 10th	Night	8% 5% 2 6% 4 4 4 3 6% 10% 47%	4078
	11th to 20th	Night	4 3 1 4 3 3 4 3 6% 9% 59%	4077
	21st to end	Night	5% 4 2 4 4 3 4 4 7% 10% 55%	4449
August	1st to 10th	Night	4 2 1 4 3 4 4 3 6% 9% 61%	2926
	11th to 20th	Night	8% 4 2 5% 4 4 4 4 5% 8% 50%	2952
	21st to end	Night	4 3 1 4 3 3 3 3 6% 7% 63%	3586
September	1st to 10th	Night	10% 6% 1 5% 4 3 3 3 4 7% 55%	2000
	11th to 20th	Night	10% 5% 2 5% 4 4 4 3 5% 8% 50%	2107
	21st to end	Night	9% 5% 2 5% 3 4 2 3 4 6% 57%	2235
October	1st to 10th	Night	7% 3 1 4 3 3 2 3 4 7% 62%	2400
	11th to 20th	Night	13% 5% 1 4 3 3 3 3 4 5% 56%	2400
	21st to end	Night	16% 8% 2 5% 3 2 3 3 4 5% 50%	2640
November	1st to 10th	Night	11% 6% 1 4 2 2 2 2 3 5% 60%	2460
	11th to 20th	Night	11% 6% 2 4 4 2 4 3 4 5% 55%	2619
	21st to end	Night	14% 8% 3 5% 3 3 3 3 4 5% 48%	2940
December	1st to 10th	Night	9% 10% 3 5% 3 3 3 3 5% 6% 50%	4720
	11th to 20th	Night	15% 7% 3 7% 4 3 3 2 4 4 49%	5339
	21st to end	Night	18% 15% 6% 8% 4 3 3 3 4 4 31%	6792

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	44% 3 9% 25% 17% 3	5290
	11th to 20th	Day	37% 4 7% 28% 18% 6%	5310
	21st to end	Day	43% 3 8% 20% 19% 7%	5812
February	1st to 10th	Day	48% 4 10% 23% 12% 2	1890
	11th to 20th	Day	45% 4 10% 20% 17% 4	1853
	21st to end	Day	44% 4 7% 20% 18% 7%	1851
March	1st to 10th	Day	38% 5% 7% 21% 16% 14%	4958
	11th to 20th	Day	32% 4 8% 20% 23% 12%	4980
	21st to end	Day	47% 7% 11% 26% 8% 1	5464
April	1st to 10th	Day	39% 6% 11% 23% 18% 2	2344
	11th to 20th	Day	45% 6% 13% 18% 17% 3	2374
	21st to end	Day	49% 6% 10% 23% 12% 1	2400
May	1st to 10th	Day	47% 8% 10% 20% 14% 1	5886
	11th to 20th	Day	39% 9% 11% 24% 15% 2	5866
	21st to end	Day	45% 8% 12% 20% 15% 1	6447
June	1st to 10th	Day	32% 10% 16% 26% 15% 1	2780
	11th to 20th	Day	32% 8% 14% 29% 15% 2	2800
	21st to end	Day	24% 8% 18% 29% 16% 4	2682
July	1st to 10th	Day	35% 7% 15% 24% 17% 2	5836
	11th to 20th	Day	34% 6% 15% 30% 13% 1	5831
	21st to end	Day	28% 7% 21% 33% 11%	6240
August	1st to 10th	Day	26% 7% 16% 28% 21% 2	4220
	11th to 20th	Day	36% 6% 16% 27% 14%	4130
	21st to end	Day	27% 6% 12% 36% 15% 3	4311
September	1st to 10th	Day	34% 7% 11% 25% 15% 9%	2400
	11th to 20th	Day	37% 6% 11% 22% 22% 2	2290
	21st to end	Day	30% 6% 11% 26% 23% 4	2144
October	1st to 10th	Day	17% 3 6% 18% 38% 17%	3260
	11th to 20th	Day	21% 2 5% 23% 33% 14%	3240
	21st to end	Day	29% 2 8% 32% 25% 4	3538
November	1st to 10th	Day	31% 4 9% 27% 23% 6%	2058
	11th to 20th	Day	35% 5% 8% 23% 22% 8%	1994
	21st to end	Day	40% 4 8% 23% 23% 2	1680
December	1st to 10th	Day	36% 3 7% 33% 20% 1	2690
	11th to 20th	Day	38% 3 6% 27% 23% 2	3085
	21st to end	Day	59% 5% 6% 19% 10% 1	4421
January	1st to 10th	Night	47% 4 9% 25% 14% 2	7635
	11th to 20th	Night	34% 4 7% 22% 29% 4	7680
	21st to end	Night	45% 3 9% 19% 21% 4	8402
February	1st to 10th	Night	43% 4 11% 24% 14% 4	2730
	11th to 20th	Night	43% 3 9% 23% 17% 3	2661
	21st to end	Night	40% 4 9% 21% 20% 6%	1972
March	1st to 10th	Night	43% 5% 7% 17% 22% 7%	4941
	11th to 20th	Night	31% 5% 7% 23% 22% 11%	4980
	21st to end	Night	38% 7% 12% 27% 14% 1	5467
April	1st to 10th	Night	32% 6% 13% 24% 21% 5%	2055
	11th to 20th	Night	35% 6% 11% 23% 20% 5%	1975
	21st to end	Night	42% 7% 12% 21% 16% 1	2000
May	1st to 10th	Night	40% 7% 11% 26% 13% 3	4090
	11th to 20th	Night	37% 7% 14% 23% 14% 4	4054
	21st to end	Night	42% 8% 13% 23% 12% 3	4452
June	1st to 10th	Night	27% 7% 15% 30% 16% 4	1610
	11th to 20th	Night	23% 8% 17% 30% 20% 3	1600
	21st to end	Night	20% 5% 18% 31% 21% 5%	1708
July	1st to 10th	Night	33% 6% 16% 24% 18% 4	4035
	11th to 20th	Night	23% 6% 13% 40% 17% 1	4026
	21st to end	Night	23% 6% 19% 36% 16%	4320
August	1st to 10th	Night	20% 7% 14% 34% 24% 1	2916
	11th to 20th	Night	32% 6% 16% 29% 16% 1	2979
	21st to end	Night	20% 5% 14% 36% 20% 4	3586
September	1st to 10th	Night	29% 5% 13% 26% 19% 8%	2000
	11th to 20th	Night	32% 6% 11% 24% 23% 4	2107
	21st to end	Night	29% 5% 9% 24% 30% 4	2235
October	1st to 10th	Night	14% 3 7% 16% 39% 21%	3920
	11th to 20th	Night	22% 3 5% 20% 30% 20%	3899
	21st to end	Night	30% 3 6% 31% 24% 5%	4252
November	1st to 10th	Night	28% 4 9% 27% 25% 8%	2460
	11th to 20th	Night	31% 4 7% 27% 25% 7%	2619
	21st to end	Night	39% 4 8% 22% 23% 4	2940
December	1st to 10th	Night	36% 3 9% 34% 17% 1	4720
	11th to 20th	Night	41% 3 7% 23% 23% 3	5341
	21st to end	Night	56% 5% 8% 20% 9% 2	6792

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% 17% 43% 17% 5%	330
	11th to 20th	Day	19% 22% 42% 14% 2	330
	21st to end	Day	17% 21% 46% 14% 3	363
February	1st to 10th	Day	21% 20% 42% 15% 3	330
	11th to 20th	Day	23% 20% 40% 14% 3	330
	21st to end	Day	24% 25% 35% 14% 2	273
March	1st to 10th	Day	20% 19% 36% 21% 4	306
	11th to 20th	Day	23% 19% 37% 19% 2	300
	21st to end	Day	26% 20% 41% 10% 3 1	330
April	1st to 10th	Day	21% 20% 35% 19% 5% 1	444
	11th to 20th	Day	20% 20% 36% 18% 6%	492
	21st to end	Day	23% 13% 32% 25% 6% 1	500
May	1st to 10th	Day	19% 13% 35% 25% 7% 1	689
	11th to 20th	Day	14% 11% 30% 28% 13% 3	725
	21st to end	Day	14% 6% 31% 28% 15% 6%	789
June	1st to 10th	Day	10% 6% 18% 32% 26% 8%	730
	11th to 20th	Day	7% 4 19% 36% 28% 7%	730
	21st to end	Day	5% 3 24% 38% 25% 5%	730
July	1st to 10th	Day	10% 2 12% 30% 34% 12%	721
	11th to 20th	Day	5% 3 13% 36% 34% 8%	718
	21st to end	Day	9% 2 10% 34% 32% 14%	794
August	1st to 10th	Day	8% 3 13% 41% 30% 5%	726
	11th to 20th	Day	10% 3 13% 33% 34% 8%	674
	21st to end	Day	10% 2 9% 28% 35% 15%	583
September	1st to 10th	Day	11% 3 10% 34% 32% 10%	530
	11th to 20th	Day	6% 4 15% 38% 27% 10%	420
	21st to end	Day	10% 6% 22% 29% 23% 10%	330
October	1st to 10th	Day	9% 6% 29% 29% 21% 6%	330
	11th to 20th	Day	14% 13% 34% 28% 9% 2	330
	21st to end	Day	26% 12% 31% 26% 3 1	363
November	1st to 10th	Day	14% 10% 39% 28% 7% 1	330
	11th to 20th	Day	13% 22% 33% 22% 9% 1	330
	21st to end	Day	22% 18% 33% 21% 6% 1	330
December	1st to 10th	Day	16% 20% 40% 15% 6% 2	330
	11th to 20th	Day	20% 16% 38% 20% 6%	330
	21st to end	Day	18% 23% 39% 17% 3	363
January	1st to 10th	Night	16% 18% 38% 22% 5%	1050
	11th to 20th	Night	17% 20% 40% 19% 4	1050
	21st to end	Night	16% 20% 41% 21% 3	1155
February	1st to 10th	Night	18% 15% 43% 21% 3	1050
	11th to 20th	Night	20% 18% 41% 19% 2	1026
	21st to end	Night	18% 20% 40% 19% 2	588
March	1st to 10th	Night	18% 17% 36% 25% 4	606
	11th to 20th	Night	22% 14% 36% 24% 4	600
	21st to end	Night	18% 16% 40% 21% 4 1	660
April	1st to 10th	Night	14% 16% 37% 29% 4	600
	11th to 20th	Night	16% 15% 35% 29% 6%	593
	21st to end	Night	20% 12% 39% 22% 7%	600
May	1st to 10th	Night	17% 6% 35% 35% 8%	600
	11th to 20th	Night	16% 5% 28% 34% 16% 2	591
	21st to end	Night	13% 4 28% 34% 20% 2	650
June	1st to 10th	Night	9% 4 17% 39% 31% 1	600
	11th to 20th	Night	6% 1 20% 43% 28% 2	600
	21st to end	Night	2 1 20% 49% 27% 1	600
July	1st to 10th	Night	7% 1 11% 38% 39% 4	585
	11th to 20th	Night	4 2 8% 45% 37% 5%	582
	21st to end	Night	6% 1 8% 45% 34% 6%	657
August	1st to 10th	Night	6% 1 9% 46% 35% 2	597
	11th to 20th	Night	8% 2 11% 46% 31% 4	594
	21st to end	Night	5% 2 11% 38% 41% 4	660
September	1st to 10th	Night	11% 2 13% 38% 34% 2	600
	11th to 20th	Night	11% 2 12% 41% 31% 4	600
	21st to end	Night	11% 4 20% 38% 23% 3	635
October	1st to 10th	Night	8% 3 25% 39% 23% 3	800
	11th to 20th	Night	15% 8% 34% 32% 11%	800
	21st to end	Night	20% 10% 32% 29% 10%	880
November	1st to 10th	Night	12% 11% 37% 29% 10%	820
	11th to 20th	Night	13% 13% 40% 26% 7%	887
	21st to end	Night	19% 15% 36% 23% 8%	1050
December	1st to 10th	Night	17% 14% 41% 23% 5%	1050
	11th to 20th	Night	20% 14% 36% 26% 4	1050
	21st to end	Night	20% 17% 40% 21% 3	1155

Page generated at 2026-02-28 00:40:23. Version ac07

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