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 2024-12-02.

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	12% 7% 3 6% 4 4 4 3 5% 7% 45%	101105
	Night	11% 7% 3 6% 4 3 3 3 5% 6% 49%	98590
Transparency	Day	37% 6% 12% 24% 17% 4	104755
	Night	34% 6% 11% 25% 20% 5%	103080
Seeing	Day	14% 10% 26% 28% 18% 5%	15611
	Night	14% 10% 30% 30% 14% 1	25452

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	12% 12% 4 6% 4 3 3 3 3 5% 45%	2847
	11th to 20th	Day	10% 9% 4 7% 5% 4 4 3 4 6% 44%	2850
	21st to end	Day	20% 12% 3 7% 2 3 3 2 4 5% 39%	3135
February	1st to 10th	Day	15% 11% 3 8% 5% 4 4 3 4 5% 38%	1710
	11th to 20th	Day	13% 10% 3 8% 4 4 4 3 4 5% 43%	1664
	21st to end	Day	16% 9% 4 7% 4 4 4 3 6% 6% 38%	1679
March	1st to 10th	Day	16% 8% 3 6% 3 3 3 3 4 5% 47%	3436
	11th to 20th	Day	13% 8% 2 5% 4 3 3 2 5% 6% 49%	3480
	21st to end	Day	18% 9% 4 7% 6% 4 4 4 4 6% 34%	3814
April	1st to 10th	Day	11% 7% 3 6% 3 4 4 3 5% 7% 44%	2227
	11th to 20th	Day	16% 9% 2 7% 4 4 3 4 4 6% 40%	2254
	21st to end	Day	20% 9% 3 6% 4 4 4 3 5% 5% 37%	2280
May	1st to 10th	Day	19% 8% 2 7% 5% 4 4 4 5% 6% 35%	4068
	11th to 20th	Day	13% 7% 3 7% 5% 4 5% 4 6% 8% 40%	4082
	21st to end	Day	14% 5% 2 7% 5% 6% 6% 4 6% 8% 38%	4477
June	1st to 10th	Day	9% 4 2 6% 4 5% 5% 4 6% 10% 46%	2641
	11th to 20th	Day	7% 4 2 5% 5% 4 5% 4 7% 9% 48%	2660
	21st to end	Day	6% 2 2 4 3 4 5% 4 7% 9% 54%	2548
July	1st to 10th	Day	11% 4 2 5% 5% 5% 6% 4 7% 9% 42%	4120
	11th to 20th	Day	6% 4 2 5% 5% 5% 5% 4 7% 9% 49%	4120
	21st to end	Day	7% 4 2 5% 5% 5% 6% 5% 8% 11% 42%	4465
August	1st to 10th	Day	5% 3 2 5% 4 4 5% 3 5% 8% 56%	4104
	11th to 20th	Day	10% 4 2 6% 5% 5% 5% 4 6% 8% 45%	3963
	21st to end	Day	6% 4 1 5% 3 3 4 3 6% 8% 56%	4180
September	1st to 10th	Day	11% 5% 2 5% 4 3 4 3 5% 6% 51%	2280
	11th to 20th	Day	11% 7% 2 7% 5% 4 4 4 6% 7% 45%	2176
	21st to end	Day	8% 4 2 5% 5% 4 5% 3 6% 7% 52%	2037
October	1st to 10th	Day	10% 4 2 4 3 3 3 4 4 6% 56%	1900
	11th to 20th	Day	13% 6% 2 5% 2 3 2 3 3 4 57%	1900
	21st to end	Day	17% 7% 2 4 3 3 3 2 3 5% 50%	2090
November	1st to 10th	Day	11% 6% 2 5% 3 3 3 2 4 6% 56%	1958
	11th to 20th	Day	13% 8% 2 5% 3 3 3 3 5% 6% 50%	1900
	21st to end	Day	15% 9% 3 6% 3 3 2 2 3 6% 49%	1600
December	1st to 10th	Day	13% 8% 4 7% 3 4 3 2 5% 7% 44%	1528
	11th to 20th	Day	11% 12% 3 7% 5% 4 3 2 4 4 44%	1918
	21st to end	Day	12% 18% 6% 9% 5% 4 4 3 5% 5% 29%	3014
January	1st to 10th	Night	11% 8% 4 10% 5% 4 3 3 3 5% 42%	4108
	11th to 20th	Night	10% 6% 2 7% 7% 4 5% 4 4 6% 44%	4120
	21st to end	Night	19% 12% 5% 7% 3 2 2 2 3 5% 40%	4532
February	1st to 10th	Night	14% 10% 4 7% 4 3 3 3 4 6% 43%	2470
	11th to 20th	Night	14% 8% 3 8% 5% 3 3 3 4 6% 45%	2401
	21st to end	Night	14% 9% 3 6% 5% 3 4 3 5% 5% 44%	1790
March	1st to 10th	Night	15% 9% 3 6% 3 3 3 3 4 5% 46%	3419
	11th to 20th	Night	12% 6% 2 6% 4 3 3 3 4 5% 52%	3480
	21st to end	Night	13% 8% 4 7% 5% 5% 4 4 5% 6% 40%	3817
April	1st to 10th	Night	11% 6% 2 4 3 3 3 3 6% 7% 52%	1952
	11th to 20th	Night	13% 7% 2 5% 4 3 4 3 5% 6% 47%	1875
	21st to end	Night	18% 7% 3 6% 4 3 4 4 6% 7% 40%	1900
May	1st to 10th	Night	14% 8% 2 5% 4 3 4 3 5% 7% 44%	2833
	11th to 20th	Night	13% 7% 3 7% 3 4 4 3 6% 7% 42%	2823
	21st to end	Night	10% 7% 2 6% 5% 4 4 4 6% 9% 43%	3090
June	1st to 10th	Night	7% 4 1 5% 4 3 3 4 7% 9% 53%	1530
	11th to 20th	Night	5% 2 1 3 4 4 4 4 6% 11% 55%	1520
	21st to end	Night	3 3 1 3 3 4 4 3 4 8% 63%	1622
July	1st to 10th	Night	9% 5% 2 5% 4 4 4 3 6% 9% 49%	2850
	11th to 20th	Night	4 2 1 4 3 4 4 3 6% 9% 62%	2850
	21st to end	Night	7% 5% 2 4 4 3 4 4 7% 9% 52%	3098
August	1st to 10th	Night	4 2 1 4 3 3 4 3 6% 8% 61%	2836
	11th to 20th	Night	8% 4 2 5% 4 4 4 4 5% 8% 51%	2860
	21st to end	Night	4 3 1 3 3 3 3 3 6% 7% 64%	3476
September	1st to 10th	Night	9% 6% 1 5% 4 2 3 3 4 6% 57%	1900
	11th to 20th	Night	10% 5% 2 5% 4 3 4 3 4 8% 51%	2001
	21st to end	Night	9% 5% 2 4 3 4 2 3 4 6% 58%	2123
October	1st to 10th	Night	7% 4 1 4 3 3 2 3 4 7% 61%	2280
	11th to 20th	Night	13% 5% 1 4 3 3 3 3 4 5% 56%	2280
	21st to end	Night	15% 7% 2 5% 3 2 3 3 4 5% 51%	2508
November	1st to 10th	Night	11% 6% 2 4 2 2 2 2 4 5% 60%	2340
	11th to 20th	Night	11% 6% 2 4 4 2 4 3 4 5% 55%	2494
	21st to end	Night	14% 8% 3 4 3 3 3 3 4 5% 50%	2800
December	1st to 10th	Night	13% 9% 4 5% 4 3 3 3 5% 6% 44%	2687
	11th to 20th	Night	14% 8% 3 8% 4 4 3 3 4 5% 43%	3279
	21st to end	Night	15% 14% 7% 9% 4 3 3 3 4 4 32%	4646

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 8% 26% 18% 2	2848
	11th to 20th	Day	41% 5% 12% 26% 12% 5%	2850
	21st to end	Day	48% 4 9% 19% 16% 4	3135
February	1st to 10th	Day	49% 4 10% 23% 11% 3	1710
	11th to 20th	Day	44% 4 10% 21% 17% 4	1673
	21st to end	Day	46% 4 7% 20% 14% 8%	1679
March	1st to 10th	Day	39% 6% 7% 21% 19% 8%	3436
	11th to 20th	Day	35% 6% 11% 25% 17% 6%	3480
	21st to end	Day	49% 8% 11% 22% 9% 1	3814
April	1st to 10th	Day	38% 7% 11% 24% 18% 2	2227
	11th to 20th	Day	45% 6% 13% 17% 16% 3	2254
	21st to end	Day	49% 6% 9% 23% 12% 1	2280
May	1st to 10th	Day	47% 10% 10% 19% 14% 1	4106
	11th to 20th	Day	40% 11% 12% 24% 13%	4086
	21st to end	Day	40% 10% 14% 22% 13% 1	4489
June	1st to 10th	Day	31% 10% 16% 26% 15% 1	2641
	11th to 20th	Day	31% 9% 14% 30% 15% 2	2660
	21st to end	Day	24% 8% 18% 29% 17% 4	2548
July	1st to 10th	Day	36% 8% 17% 23% 13% 2	4056
	11th to 20th	Day	29% 6% 13% 32% 17% 1	4051
	21st to end	Day	32% 8% 23% 27% 10%	4325
August	1st to 10th	Day	26% 7% 16% 27% 22% 2	4090
	11th to 20th	Day	37% 7% 16% 26% 14%	4002
	21st to end	Day	26% 6% 12% 37% 15% 3	4179
September	1st to 10th	Day	33% 7% 12% 24% 15% 9%	2280
	11th to 20th	Day	36% 6% 10% 22% 23% 2	2176
	21st to end	Day	30% 6% 11% 26% 23% 4	2037
October	1st to 10th	Day	17% 3 6% 18% 38% 18%	3160
	11th to 20th	Day	21% 2 5% 23% 34% 15%	3140
	21st to end	Day	28% 3 9% 32% 25% 4	3428
November	1st to 10th	Day	31% 4 10% 26% 23% 6%	1958
	11th to 20th	Day	35% 5% 8% 22% 22% 8%	1900
	21st to end	Day	39% 4 8% 23% 24% 2	1600
December	1st to 10th	Day	41% 4 8% 30% 16% 1	1528
	11th to 20th	Day	45% 4 8% 18% 23% 2	1915
	21st to end	Day	55% 7% 8% 17% 12% 1	3014
January	1st to 10th	Night	45% 4 10% 23% 16% 2	4108
	11th to 20th	Night	41% 5% 12% 24% 17% 1	4120
	21st to end	Night	49% 3 10% 19% 16% 2	4532
February	1st to 10th	Night	43% 5% 11% 22% 15% 4	2470
	11th to 20th	Night	42% 4 9% 24% 18% 4	2402
	21st to end	Night	41% 4 9% 21% 18% 6%	1790
March	1st to 10th	Night	40% 6% 9% 18% 19% 8%	3419
	11th to 20th	Night	34% 7% 9% 26% 21% 3	3480
	21st to end	Night	42% 9% 12% 25% 11% 1	3817
April	1st to 10th	Night	31% 6% 13% 24% 21% 5%	1952
	11th to 20th	Night	36% 6% 11% 22% 20% 5%	1875
	21st to end	Night	42% 7% 12% 21% 16% 1	1900
May	1st to 10th	Night	38% 9% 12% 22% 15% 4	2860
	11th to 20th	Night	39% 9% 14% 25% 12% 1	2824
	21st to end	Night	35% 10% 15% 27% 11%	3099
June	1st to 10th	Night	26% 8% 16% 31% 17% 4	1530
	11th to 20th	Night	22% 8% 17% 30% 21% 2	1520
	21st to end	Night	20% 5% 17% 31% 21% 5%	1622
July	1st to 10th	Night	32% 6% 18% 23% 16% 5%	2805
	11th to 20th	Night	20% 5% 12% 39% 23% 1	2796
	21st to end	Night	27% 6% 21% 33% 13%	2999
August	1st to 10th	Night	20% 7% 14% 33% 24% 1	2826
	11th to 20th	Night	32% 6% 15% 29% 17% 1	2887
	21st to end	Night	20% 5% 14% 37% 20% 4	3476
September	1st to 10th	Night	28% 6% 13% 25% 20% 8%	1900
	11th to 20th	Night	31% 5% 10% 24% 24% 4	2001
	21st to end	Night	28% 5% 9% 24% 30% 4	2123
October	1st to 10th	Night	14% 3 7% 16% 39% 22%	3800
	11th to 20th	Night	21% 3 5% 20% 31% 20%	3779
	21st to end	Night	29% 3 7% 31% 24% 6%	4120
November	1st to 10th	Night	29% 4 9% 26% 25% 8%	2340
	11th to 20th	Night	32% 4 6% 25% 26% 7%	2494
	21st to end	Night	37% 4 8% 23% 24% 4	2800
December	1st to 10th	Night	40% 5% 11% 24% 18% 2	2687
	11th to 20th	Night	44% 4 8% 21% 21% 2	3281
	21st to end	Night	54% 7% 9% 17% 10% 3	4646

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	19% 18% 39% 17% 6%	270
	11th to 20th	Day	22% 23% 38% 14% 3	270
	21st to end	Day	18% 22% 43% 14% 3	297
February	1st to 10th	Day	21% 21% 41% 15% 3	270
	11th to 20th	Day	22% 23% 37% 15% 4	270
	21st to end	Day	26% 26% 33% 12% 2	225
March	1st to 10th	Day	19% 21% 36% 21% 3	270
	11th to 20th	Day	24% 19% 35% 21% 2	270
	21st to end	Day	25% 21% 40% 9% 3 1	297
April	1st to 10th	Day	18% 21% 35% 20% 5% 1	407
	11th to 20th	Day	20% 19% 35% 19% 6%	452
	21st to end	Day	23% 15% 32% 24% 6% 1	460
May	1st to 10th	Day	19% 14% 35% 25% 7% 1	639
	11th to 20th	Day	15% 10% 30% 29% 13% 3	675
	21st to end	Day	13% 7% 31% 28% 15% 6%	734
June	1st to 10th	Day	9% 5% 17% 33% 27% 8%	680
	11th to 20th	Day	6% 3 19% 37% 28% 7%	680
	21st to end	Day	5% 3 26% 37% 25% 5%	680
July	1st to 10th	Day	10% 2 12% 30% 33% 12%	671
	11th to 20th	Day	5% 2 14% 36% 34% 9%	668
	21st to end	Day	9% 2 10% 34% 30% 14%	739
August	1st to 10th	Day	9% 2 14% 40% 30% 5%	676
	11th to 20th	Day	11% 3 13% 34% 32% 8%	626
	21st to end	Day	9% 3 9% 27% 37% 16%	539
September	1st to 10th	Day	10% 3 10% 34% 32% 10%	490
	11th to 20th	Day	6% 3 17% 38% 26% 9%	386
	21st to end	Day	9% 6% 23% 30% 22% 9%	300
October	1st to 10th	Day	10% 6% 29% 29% 20% 7%	300
	11th to 20th	Day	14% 13% 35% 28% 9% 1	300
	21st to end	Day	24% 13% 31% 28% 2 1	330
November	1st to 10th	Day	15% 10% 37% 28% 8% 1	300
	11th to 20th	Day	14% 22% 32% 22% 10% 1	300
	21st to end	Day	21% 18% 33% 22% 5% 1	300
December	1st to 10th	Day	15% 20% 39% 18% 6% 2	273
	11th to 20th	Day	22% 14% 36% 21% 7%	270
	21st to end	Day	16% 24% 40% 16% 3	297
January	1st to 10th	Night	16% 19% 38% 22% 5%	950
	11th to 20th	Night	18% 20% 39% 19% 4	950
	21st to end	Night	16% 19% 40% 21% 3	1045
February	1st to 10th	Night	19% 17% 42% 20% 3	950
	11th to 20th	Night	18% 18% 42% 20% 2	927
	21st to end	Night	20% 21% 39% 18% 2	534
March	1st to 10th	Night	18% 16% 36% 26% 4	570
	11th to 20th	Night	22% 13% 35% 25% 5%	570
	21st to end	Night	19% 16% 39% 21% 4 1	627
April	1st to 10th	Night	14% 16% 37% 29% 4	570
	11th to 20th	Night	16% 14% 34% 29% 6%	563
	21st to end	Night	20% 12% 39% 21% 7%	570
May	1st to 10th	Night	16% 6% 36% 34% 8%	570
	11th to 20th	Night	16% 4 27% 34% 17% 2	561
	21st to end	Night	12% 5% 28% 33% 21% 2	617
June	1st to 10th	Night	8% 4 17% 39% 32%	570
	11th to 20th	Night	5% 1 21% 45% 27% 2	570
	21st to end	Night	2 1 21% 48% 26% 1	570
July	1st to 10th	Night	7% 1 12% 40% 37% 4	555
	11th to 20th	Night	3 1 8% 45% 37% 5%	552
	21st to end	Night	6% 1 8% 45% 34% 6%	624
August	1st to 10th	Night	6% 1 9% 45% 37% 2	567
	11th to 20th	Night	8% 2 11% 47% 29% 4	564
	21st to end	Night	5% 1 11% 37% 42% 4	627
September	1st to 10th	Night	10% 1 13% 38% 35% 2	570
	11th to 20th	Night	12% 2 12% 41% 29% 4	570
	21st to end	Night	11% 4 21% 39% 23% 3	603
October	1st to 10th	Night	8% 3 25% 37% 23% 3	760
	11th to 20th	Night	16% 8% 35% 31% 10%	760
	21st to end	Night	19% 10% 32% 29% 10%	836
November	1st to 10th	Night	13% 10% 37% 29% 11%	780
	11th to 20th	Night	14% 14% 40% 25% 8%	845
	21st to end	Night	18% 14% 37% 23% 8%	1000
December	1st to 10th	Night	18% 14% 41% 23% 5%	960
	11th to 20th	Night	21% 14% 35% 27% 4	950
	21st to end	Night	20% 17% 39% 21% 3	1045

Page generated at 2024-11-29 09:43:09. Version ac07

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