Lexington(NE)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lexington(NE) clear sky chart from 2005-11-06 to 2024-11-04.

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	8% 6% 2 5% 4 3 4 3 5% 7% 53%	105042
	Night	8% 6% 2 5% 4 3 4 3 5% 7% 53%	102631
Transparency	Day	30% 6% 14% 27% 19% 4	104795
	Night	30% 6% 13% 26% 20% 4	102469
Seeing	Day	11% 8% 31% 33% 15% 2	15753
	Night	10% 8% 36% 37% 9%	25641

By Month

Percentage Cloud Cover SW (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	7% 12% 3 6% 4 4 3 3 4 6% 48%	2538
	11th to 20th	Day	5% 10% 3 8% 5% 5% 5% 5% 6% 6% 42%	2540
	21st to end	Day	5% 8% 3 8% 5% 3 3 3 5% 7% 49%	3049
February	1st to 10th	Day	7% 9% 3 9% 6% 5% 5% 4 5% 7% 39%	1781
	11th to 20th	Day	5% 7% 3 8% 5% 4 4 4 6% 8% 48%	1849
	21st to end	Day	7% 8% 3 5% 3 4 3 3 4 6% 54%	1570
March	1st to 10th	Day	9% 6% 2 4 3 3 4 3 4 6% 56%	3130
	11th to 20th	Day	10% 7% 2 5% 2 2 3 2 4 6% 57%	3470
	21st to end	Day	11% 9% 3 7% 4 3 4 4 5% 7% 43%	3814
April	1st to 10th	Day	10% 6% 2 4 4 4 4 4 6% 7% 50%	2263
	11th to 20th	Day	13% 8% 2 5% 4 3 4 4 5% 7% 43%	2315
	21st to end	Day	15% 5% 2 5% 3 3 4 3 6% 7% 47%	2470
May	1st to 10th	Day	11% 5% 2 5% 4 4 4 4 5% 7% 49%	4120
	11th to 20th	Day	13% 5% 2 5% 3 4 4 3 5% 8% 50%	4082
	21st to end	Day	13% 7% 2 5% 4 3 3 3 5% 8% 46%	4489
June	1st to 10th	Day	6% 4 1 3 3 3 3 4 7% 10% 57%	2646
	11th to 20th	Day	8% 4 1 4 4 4 5% 4 6% 8% 53%	2660
	21st to end	Day	4 3 1 5% 3 4 4 4 6% 8% 57%	2660
July	1st to 10th	Day	7% 4 2 5% 4 3 4 3 5% 8% 54%	4430
	11th to 20th	Day	4 4 1 5% 3 4 4 4 6% 10% 54%	4430
	21st to end	Day	4 3 1 4 4 4 4 4 5% 9% 58%	4557
August	1st to 10th	Day	9% 5% 2 6% 4 4 5% 4 6% 8% 47%	4103
	11th to 20th	Day	11% 6% 2 5% 4 4 4 4 6% 7% 46%	4041
	21st to end	Day	5% 4 2 5% 4 3 3 2 5% 7% 61%	4246
September	1st to 10th	Day	10% 4 2 4 4 3 3 3 4 6% 58%	2209
	11th to 20th	Day	8% 3 2 4 4 3 4 3 4 6% 59%	2090
	21st to end	Day	10% 4 1 4 2 3 3 2 3 6% 64%	2090
October	1st to 10th	Day	9% 3 1 1 1 1 1 2 2 5% 74%	3480
	11th to 20th	Day	5% 4 1 4 2 3 3 3 4 6% 65%	3180
	21st to end	Day	9% 5% 2 4 3 3 3 3 4 6% 60%	3099
November	1st to 10th	Day	7% 4 1 5% 4 3 3 4 5% 7% 57%	1700
	11th to 20th	Day	5% 7% 1 4 3 3 3 3 4 5% 61%	1710
	21st to end	Day	8% 8% 2 5% 3 2 3 2 5% 7% 55%	1710
December	1st to 10th	Day	6% 7% 2 6% 4 3 4 3 4 5% 55%	1710
	11th to 20th	Day	6% 7% 3 7% 4 4 3 4 4 5% 52%	2017
	21st to end	Day	11% 13% 4 11% 5% 3 3 3 4 5% 39%	2794
January	1st to 10th	Night	7% 11% 3 11% 5% 3 3 3 5% 7% 42%	4417
	11th to 20th	Night	4 9% 3 7% 3 4 3 3 5% 7% 52%	4430
	21st to end	Night	4 9% 4 7% 5% 5% 5% 4 5% 6% 46%	4614
February	1st to 10th	Night	8% 10% 3 7% 4 4 5% 4 5% 7% 44%	2413
	11th to 20th	Night	4 8% 3 6% 4 4 5% 4 6% 8% 48%	2218
	21st to end	Night	5% 7% 2 6% 5% 3 4 4 4 5% 54%	1884
March	1st to 10th	Night	9% 6% 2 4 3 3 3 2 4 6% 58%	3734
	11th to 20th	Night	8% 6% 2 5% 3 3 3 3 4 6% 57%	3489
	21st to end	Night	14% 8% 3 6% 4 4 4 4 6% 7% 42%	3817
April	1st to 10th	Night	11% 7% 2 5% 3 4 4 4 5% 6% 49%	1914
	11th to 20th	Night	12% 5% 2 5% 4 4 4 4 6% 7% 47%	1813
	21st to end	Night	12% 6% 3 3 3 3 4 3 6% 8% 48%	1710
May	1st to 10th	Night	19% 5% 2 5% 4 4 4 4 5% 6% 42%	2850
	11th to 20th	Night	9% 6% 2 5% 4 4 4 4 6% 7% 48%	2823
	21st to end	Night	13% 6% 2 5% 4 4 5% 3 6% 9% 42%	3098
June	1st to 10th	Night	5% 3 1 5% 4 4 5% 4 6% 9% 53%	1530
	11th to 20th	Night	9% 4 2 5% 3 3 4 4 5% 9% 51%	1520
	21st to end	Night	4 4 1 4 4 4 5% 4 7% 9% 55%	1520
July	1st to 10th	Night	8% 4 2 5% 5% 4 4 4 6% 8% 50%	2540
	11th to 20th	Night	4 3 1 5% 5% 6% 5% 4 7% 9% 50%	2540
	21st to end	Night	3 3 1 3 2 2 3 4 5% 9% 63%	3004
August	1st to 10th	Night	6% 4 2 5% 4 4 5% 4 8% 12% 47%	2836
	11th to 20th	Night	10% 5% 2 6% 4 4 4 4 6% 7% 48%	2798
	21st to end	Night	4 3 2 5% 3 4 5% 4 6% 9% 55%	3417
September	1st to 10th	Night	8% 4 2 4 3 2 3 2 4 6% 62%	1970
	11th to 20th	Night	6% 3 1 4 3 3 3 3 4 7% 62%	2090
	21st to end	Night	8% 3 1 4 3 2 3 2 4 6% 63%	2090
October	1st to 10th	Night	8% 2 1 3 2 2 1 2 3 4 72%	3480
	11th to 20th	Night	5% 4 1 4 2 2 2 2 3 6% 67%	3705
	21st to end	Night	7% 4 1 4 3 3 4 3 5% 7% 59%	4457
November	1st to 10th	Night	5% 4 1 4 2 3 3 3 5% 7% 63%	2451
	11th to 20th	Night	6% 6% 2 4 3 4 3 4 5% 6% 57%	2470
	21st to end	Night	7% 6% 2 5% 3 3 3 3 5% 8% 57%	2470
December	1st to 10th	Night	5% 7% 2 5% 4 4 4 4 4 6% 55%	2470
	11th to 20th	Night	6% 5% 2 4 4 3 3 4 5% 7% 56%	3176
	21st to end	Night	12% 13% 3 6% 3 3 3 3 5% 6% 42%	4873

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	36% 6% 15% 29% 13% 1	2539
	11th to 20th	Day	39% 11% 11% 22% 14% 3	2540
	21st to end	Day	33% 7% 18% 25% 15% 2	3049
February	1st to 10th	Day	43% 7% 14% 20% 11% 3	1781
	11th to 20th	Day	33% 7% 16% 24% 16% 4	1859
	21st to end	Day	30% 5% 15% 26% 18% 6%	1570
March	1st to 10th	Day	29% 4 10% 24% 29% 3	3130
	11th to 20th	Day	29% 5% 12% 30% 21% 3	3470
	21st to end	Day	36% 11% 20% 26% 6% 1	3814
April	1st to 10th	Day	31% 7% 16% 26% 17% 3	2263
	11th to 20th	Day	38% 7% 15% 21% 15% 4	2318
	21st to end	Day	36% 7% 13% 27% 16% 1	2470
May	1st to 10th	Day	30% 8% 16% 23% 15% 8%	4120
	11th to 20th	Day	32% 8% 15% 31% 14% 1	4086
	21st to end	Day	34% 8% 16% 27% 12% 2	4489
June	1st to 10th	Day	21% 8% 21% 34% 14% 2	2646
	11th to 20th	Day	27% 7% 15% 27% 18% 6%	2660
	21st to end	Day	23% 8% 14% 31% 20% 5%	2660
July	1st to 10th	Day	29% 5% 12% 25% 26% 3	4361
	11th to 20th	Day	25% 5% 17% 30% 20% 3	4355
	21st to end	Day	22% 5% 16% 28% 22% 7%	4413
August	1st to 10th	Day	33% 6% 15% 24% 19% 1	4090
	11th to 20th	Day	37% 5% 15% 24% 17% 1	4080
	21st to end	Day	24% 5% 15% 26% 20% 10%	4245
September	1st to 10th	Day	28% 6% 9% 24% 25% 8%	2209
	11th to 20th	Day	25% 7% 13% 27% 24% 4	2090
	21st to end	Day	24% 4 8% 32% 27% 5%	2090
October	1st to 10th	Day	17% 3 5% 24% 38% 14%	3480
	11th to 20th	Day	22% 3 13% 36% 20% 6%	3180
	21st to end	Day	27% 3 9% 31% 25% 5%	3099
November	1st to 10th	Day	26% 6% 12% 30% 23% 3	1700
	11th to 20th	Day	25% 5% 10% 29% 26% 5%	1710
	21st to end	Day	30% 4 11% 26% 24% 5%	1710
December	1st to 10th	Day	31% 5% 14% 29% 18% 3	1710
	11th to 20th	Day	32% 5% 14% 32% 16%	2015
	21st to end	Day	49% 5% 8% 22% 14% 2	2794
January	1st to 10th	Night	41% 6% 13% 24% 15% 1	4417
	11th to 20th	Night	31% 6% 16% 26% 19% 1	4430
	21st to end	Night	37% 8% 12% 25% 17% 1	4614
February	1st to 10th	Night	39% 7% 12% 23% 14% 4	2413
	11th to 20th	Night	34% 5% 14% 28% 16% 3	2218
	21st to end	Night	31% 5% 12% 23% 22% 8%	1884
March	1st to 10th	Night	27% 5% 9% 23% 28% 8%	3734
	11th to 20th	Night	27% 6% 10% 28% 25% 4	3489
	21st to end	Night	37% 10% 22% 22% 8% 1	3817
April	1st to 10th	Night	34% 7% 15% 23% 19% 4	1914
	11th to 20th	Night	34% 6% 15% 25% 17% 3	1813
	21st to end	Night	33% 7% 16% 27% 16% 2	1710
May	1st to 10th	Night	38% 10% 13% 23% 13% 3	2850
	11th to 20th	Night	32% 10% 17% 25% 14% 1	2824
	21st to end	Night	35% 12% 17% 25% 10% 2	3099
June	1st to 10th	Night	25% 9% 23% 27% 15% 2	1530
	11th to 20th	Night	29% 8% 15% 27% 17% 5%	1520
	21st to end	Night	23% 9% 16% 29% 21% 3	1520
July	1st to 10th	Night	31% 6% 13% 30% 18% 2	2500
	11th to 20th	Night	28% 7% 17% 26% 18% 4	2492
	21st to end	Night	17% 5% 18% 25% 23% 11%	2910
August	1st to 10th	Night	29% 6% 17% 27% 19% 2	2826
	11th to 20th	Night	36% 5% 16% 26% 16% 1	2825
	21st to end	Night	27% 4 15% 28% 19% 8%	3417
September	1st to 10th	Night	24% 5% 9% 25% 26% 11%	1970
	11th to 20th	Night	23% 5% 12% 28% 25% 6%	2090
	21st to end	Night	24% 5% 8% 27% 30% 7%	2090
October	1st to 10th	Night	18% 3 6% 17% 46% 10%	3480
	11th to 20th	Night	20% 3 12% 29% 25% 11%	3705
	21st to end	Night	26% 3 10% 27% 28% 5%	4457
November	1st to 10th	Night	21% 4 12% 31% 25% 8%	2451
	11th to 20th	Night	25% 7% 10% 27% 25% 6%	2470
	21st to end	Night	27% 5% 11% 27% 26% 5%	2470
December	1st to 10th	Night	29% 6% 14% 29% 19% 4	2470
	11th to 20th	Night	27% 5% 12% 36% 19% 1	3177
	21st to end	Night	42% 5% 12% 27% 12% 1	4873

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	9% 9% 37% 32% 11% 2	270
	11th to 20th	Day	16% 11% 35% 29% 9%	270
	21st to end	Day	10% 7% 44% 24% 12% 2	297
February	1st to 10th	Day	10% 12% 46% 25% 7%	270
	11th to 20th	Day	8% 9% 44% 29% 7% 3	270
	21st to end	Day	14% 12% 48% 22% 4	225
March	1st to 10th	Day	12% 10% 43% 25% 10%	270
	11th to 20th	Day	16% 10% 34% 28% 11% 1	270
	21st to end	Day	19% 13% 39% 23% 6% 1	297
April	1st to 10th	Day	14% 19% 42% 20% 5% 1	443
	11th to 20th	Day	18% 15% 37% 25% 6%	516
	21st to end	Day	19% 14% 34% 22% 10% 2	650
May	1st to 10th	Day	15% 10% 34% 31% 9% 1	653
	11th to 20th	Day	17% 10% 31% 27% 13% 2	675
	21st to end	Day	16% 10% 31% 30% 12% 1	734
June	1st to 10th	Day	7% 6% 27% 34% 21% 6%	680
	11th to 20th	Day	8% 6% 33% 37% 14% 1	680
	21st to end	Day	6% 7% 31% 40% 16% 1	680
July	1st to 10th	Day	5% 5% 23% 36% 27% 4	671
	11th to 20th	Day	4 2 20% 42% 28% 4	668
	21st to end	Day	6% 2 17% 44% 26% 6%	739
August	1st to 10th	Day	8% 2 17% 44% 26% 3	676
	11th to 20th	Day	9% 3 19% 45% 22% 2	665
	21st to end	Day	8% 3 18% 45% 23% 4	579
September	1st to 10th	Day	10% 3 25% 41% 19% 2	419
	11th to 20th	Day	4 6% 31% 34% 21% 4	300
	21st to end	Day	12% 9% 28% 31% 16% 3	300
October	1st to 10th	Day	19% 6% 24% 30% 15% 6%	300
	11th to 20th	Day	7% 9% 42% 27% 11% 3	300
	21st to end	Day	20% 13% 27% 30% 9% 1	330
November	1st to 10th	Day	12% 8% 39% 28% 11% 2	279
	11th to 20th	Day	9% 12% 38% 29% 11% 1	270
	21st to end	Day	16% 10% 40% 23% 10% 2	270
December	1st to 10th	Day	8% 8% 43% 30% 10% 1	270
	11th to 20th	Day	14% 9% 37% 30% 9% 1	270
	21st to end	Day	15% 13% 38% 28% 6% 1	297
January	1st to 10th	Night	10% 9% 38% 35% 8% 1	950
	11th to 20th	Night	10% 11% 39% 34% 6% 1	950
	21st to end	Night	8% 8% 45% 31% 7%	1045
February	1st to 10th	Night	13% 8% 44% 29% 6%	893
	11th to 20th	Night	7% 10% 44% 34% 5%	744
	21st to end	Night	9% 11% 44% 32% 4	628
March	1st to 10th	Night	11% 11% 41% 33% 3	760
	11th to 20th	Night	13% 9% 39% 32% 6% 1	579
	21st to end	Night	16% 12% 39% 28% 5%	627
April	1st to 10th	Night	13% 15% 42% 29% 2	570
	11th to 20th	Night	14% 15% 42% 27% 2	563
	21st to end	Night	16% 11% 37% 30% 7%	570
May	1st to 10th	Night	16% 7% 39% 32% 6%	570
	11th to 20th	Night	16% 8% 35% 34% 7% 1	561
	21st to end	Night	17% 7% 33% 33% 10%	617
June	1st to 10th	Night	7% 5% 32% 41% 14% 1	570
	11th to 20th	Night	10% 5% 39% 37% 8%	570
	21st to end	Night	4 4 35% 47% 10%	570
July	1st to 10th	Night	5% 3 28% 43% 20% 1	555
	11th to 20th	Night	3 1 24% 55% 17% 1	552
	21st to end	Night	4 1 19% 54% 21% 1	624
August	1st to 10th	Night	7% 2 18% 51% 21% 1	567
	11th to 20th	Night	9% 2 22% 50% 16%	564
	21st to end	Night	7% 2 23% 47% 20% 1	627
September	1st to 10th	Night	8% 3 27% 50% 11% 1	570
	11th to 20th	Night	6% 4 35% 39% 15% 1	570
	21st to end	Night	9% 6% 33% 37% 14%	570
October	1st to 10th	Night	15% 6% 33% 33% 12%	570
	11th to 20th	Night	12% 10% 35% 33% 10%	712
	21st to end	Night	13% 11% 33% 33% 10%	1035
November	1st to 10th	Night	7% 8% 37% 42% 6% 1	943
	11th to 20th	Night	9% 9% 37% 37% 8%	950
	21st to end	Night	10% 8% 35% 35% 10% 1	950
December	1st to 10th	Night	8% 10% 41% 37% 5%	950
	11th to 20th	Night	12% 8% 38% 34% 8%	950
	21st to end	Night	14% 10% 37% 33% 6%	1045

Page generated at 2024-11-01 21:47:31. Version ac07

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