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 2024-03-28.

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	9% 6% 2 5% 4 3 4 4 5% 7% 52%	78899
	Night	8% 6% 2 5% 4 3 4 4 5% 7% 52%	81144
Transparency	Day	31% 7% 14% 27% 18% 3	78613
	Night	31% 6% 13% 26% 19% 4	80954
Seeing	Day	11% 8% 31% 33% 15% 2	14803
	Night	10% 8% 36% 37% 9%	24939

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 5% 5% 3 3 4 4 6% 48%	2538
	11th to 20th	Day	6% 10% 3 7% 5% 4 6% 6% 5% 7% 42%	2540
	21st to end	Day	5% 8% 3 7% 5% 2 3 4 5% 7% 49%	3049
February	1st to 10th	Day	8% 8% 4 8% 7% 3 6% 5% 5% 7% 39%	1781
	11th to 20th	Day	5% 6% 3 7% 5% 3 4 4 6% 8% 49%	1849
	21st to end	Day	7% 7% 3 5% 3 2 4 3 4 6% 55%	1570
March	1st to 10th	Day	8% 5% 3 4 3 2 3 3 4 7% 58%	1900
	11th to 20th	Day	11% 8% 3 5% 3 2 3 4 5% 7% 50%	2080
	21st to end	Day	13% 10% 3 7% 5% 3 4 4 5% 7% 40%	2255
April	1st to 10th	Day	10% 6% 2 4 4 2 4 5% 5% 8% 50%	2143
	11th to 20th	Day	13% 7% 3 4 4 3 4 5% 5% 8% 43%	2191
	21st to end	Day	15% 5% 2 4 4 2 4 4 5% 7% 47%	2340
May	1st to 10th	Day	12% 6% 3 5% 4 3 5% 4 5% 8% 45%	2340
	11th to 20th	Day	15% 6% 3 5% 4 3 4 4 5% 7% 44%	2302
	21st to end	Day	13% 7% 2 5% 5% 3 4 5% 6% 8% 43%	2531
June	1st to 10th	Day	6% 3 1 3 3 2 4 4 6% 10% 57%	2506
	11th to 20th	Day	8% 4 1 4 4 3 5% 5% 6% 8% 54%	2520
	21st to end	Day	4 3 1 4 4 3 4 5% 5% 8% 58%	2520
July	1st to 10th	Day	6% 3 2 4 5% 3 5% 5% 6% 8% 54%	2520
	11th to 20th	Day	4 3 2 3 3 3 4 4 5% 9% 59%	2520
	21st to end	Day	5% 3 2 4 5% 3 5% 5% 6% 9% 53%	2598
August	1st to 10th	Day	7% 4 2 6% 5% 3 5% 6% 7% 10% 45%	2328
	11th to 20th	Day	6% 4 1 4 4 2 4 5% 6% 8% 56%	2301
	21st to end	Day	7% 4 2 3 5% 3 3 3 5% 8% 57%	2414
September	1st to 10th	Day	11% 4 2 3 4 2 3 4 4 5% 58%	2093
	11th to 20th	Day	8% 4 2 4 4 2 3 4 4 6% 58%	1980
	21st to end	Day	10% 4 1 3 3 2 3 3 3 6% 63%	1980
October	1st to 10th	Day	15% 6% 1 2 3 1 2 3 4 6% 58%	1980
	11th to 20th	Day	9% 6% 2 4 3 2 2 3 4 5% 61%	1826
	21st to end	Day	13% 7% 2 4 3 2 2 3 3 5% 56%	1790
November	1st to 10th	Day	6% 4 1 4 4 3 3 4 5% 7% 58%	1673
	11th to 20th	Day	6% 6% 2 3 4 2 4 3 4 5% 61%	1710
	21st to end	Day	8% 7% 3 4 3 2 3 3 4 7% 56%	1710
December	1st to 10th	Day	6% 6% 3 5% 5% 2 4 4 4 5% 55%	1710
	11th to 20th	Day	6% 7% 4 6% 5% 3 3 4 5% 6% 52%	2017
	21st to end	Day	11% 13% 4 9% 7% 2 4 3 3 5% 39%	2794
January	1st to 10th	Night	7% 10% 4 9% 7% 2 3 3 5% 7% 42%	4417
	11th to 20th	Night	4 8% 3 6% 4 3 4 3 5% 7% 52%	4430
	21st to end	Night	4 9% 4 6% 5% 3 5% 5% 4 6% 47%	4614
February	1st to 10th	Night	8% 9% 3 7% 5% 3 5% 5% 5% 7% 44%	2413
	11th to 20th	Night	4 7% 4 6% 5% 3 5% 5% 6% 8% 48%	2218
	21st to end	Night	5% 7% 3 5% 6% 3 4 4 4 5% 55%	1884
March	1st to 10th	Night	8% 7% 3 4 5% 2 3 3 4 6% 55%	2280
	11th to 20th	Night	10% 7% 3 4 4 2 4 4 4 6% 52%	2099
	21st to end	Night	12% 8% 4 5% 4 3 4 4 5% 7% 43%	2255
April	1st to 10th	Night	11% 6% 2 5% 4 3 5% 5% 5% 7% 48%	1814
	11th to 20th	Night	13% 4 2 5% 5% 2 4 5% 6% 8% 47%	1717
	21st to end	Night	12% 5% 3 3 4 2 4 4 5% 8% 49%	1620
May	1st to 10th	Night	13% 5% 3 5% 5% 3 4 5% 6% 7% 44%	1620
	11th to 20th	Night	14% 6% 3 4 4 3 4 5% 5% 8% 46%	1593
	21st to end	Night	14% 5% 2 5% 5% 3 5% 4 7% 10% 40%	1745
June	1st to 10th	Night	5% 3 1 4 4 3 5% 6% 7% 9% 54%	1450
	11th to 20th	Night	8% 4 2 5% 3 3 4 5% 5% 10% 52%	1440
	21st to end	Night	4 4 1 3 4 3 5% 5% 7% 9% 55%	1440
July	1st to 10th	Night	5% 3 3 5% 5% 4 5% 6% 8% 10% 48%	1440
	11th to 20th	Night	2 1 1 4 5% 4 5% 5% 6% 9% 58%	1440
	21st to end	Night	4 3 2 4 4 3 4 6% 6% 11% 53%	1718
August	1st to 10th	Night	5% 4 2 4 5% 3 5% 5% 7% 11% 48%	1611
	11th to 20th	Night	6% 3 2 4 3 2 4 4 7% 9% 55%	1600
	21st to end	Night	5% 4 2 3 2 2 4 4 5% 8% 62%	1938
September	1st to 10th	Night	9% 4 2 3 4 2 3 3 4 5% 61%	1866
	11th to 20th	Night	7% 3 1 3 4 3 3 4 4 7% 62%	1980
	21st to end	Night	9% 3 1 3 4 2 3 3 4 6% 63%	1980
October	1st to 10th	Night	14% 4 1 3 3 3 2 4 4 7% 54%	1980
	11th to 20th	Night	8% 5% 2 4 3 2 2 3 4 5% 63%	2114
	21st to end	Night	10% 5% 2 4 3 2 2 3 4 6% 60%	2564
November	1st to 10th	Night	5% 4 1 4 3 2 3 4 4 7% 64%	2405
	11th to 20th	Night	6% 5% 2 4 3 3 3 5% 5% 7% 57%	2470
	21st to end	Night	7% 5% 2 4 3 2 3 4 5% 7% 57%	2470
December	1st to 10th	Night	5% 6% 3 4 4 3 4 5% 4 6% 55%	2470
	11th to 20th	Night	6% 4 2 4 4 2 4 4 5% 7% 57%	3176
	21st to end	Night	12% 12% 3 5% 4 2 4 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	27% 5% 13% 29% 22% 4	1900
	11th to 20th	Day	34% 6% 12% 27% 17% 4	2080
	21st to end	Day	43% 7% 16% 24% 10% 1	2255
April	1st to 10th	Day	32% 7% 16% 25% 16% 3	2143
	11th to 20th	Day	38% 7% 15% 22% 14% 4	2194
	21st to end	Day	35% 7% 13% 28% 16% 1	2340
May	1st to 10th	Day	36% 8% 16% 24% 14% 2	2340
	11th to 20th	Day	39% 8% 16% 26% 11% 1	2306
	21st to end	Day	37% 9% 19% 22% 11% 2	2531
June	1st to 10th	Day	22% 8% 21% 34% 14% 2	2506
	11th to 20th	Day	27% 7% 15% 27% 18% 6%	2520
	21st to end	Day	22% 8% 14% 31% 20% 5%	2520
July	1st to 10th	Day	26% 8% 15% 28% 21% 2	2451
	11th to 20th	Day	20% 7% 15% 30% 24% 4	2445
	21st to end	Day	24% 8% 19% 32% 16% 1	2454
August	1st to 10th	Day	31% 11% 18% 26% 13% 1	2314
	11th to 20th	Day	25% 6% 15% 35% 17% 2	2301
	21st to end	Day	26% 6% 12% 26% 23% 7%	2414
September	1st to 10th	Day	29% 6% 10% 23% 24% 9%	2093
	11th to 20th	Day	25% 7% 12% 27% 24% 4	1980
	21st to end	Day	25% 4 9% 32% 27% 4	1980
October	1st to 10th	Day	29% 5% 9% 29% 26% 3	1980
	11th to 20th	Day	27% 5% 9% 30% 22% 8%	1826
	21st to end	Day	32% 4 10% 25% 23% 6%	1790
November	1st to 10th	Day	25% 6% 12% 29% 23% 4	1673
	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	31% 5% 11% 25% 23% 6%	2280
	11th to 20th	Night	33% 6% 10% 25% 21% 5%	2099
	21st to end	Night	39% 7% 17% 21% 14% 2	2255
April	1st to 10th	Night	34% 7% 15% 22% 18% 3	1814
	11th to 20th	Night	35% 6% 16% 26% 15% 3	1717
	21st to end	Night	33% 6% 15% 27% 17% 2	1620
May	1st to 10th	Night	36% 10% 15% 22% 15% 2	1620
	11th to 20th	Night	36% 8% 18% 23% 14% 1	1594
	21st to end	Night	38% 10% 17% 19% 12% 3	1746
June	1st to 10th	Night	24% 9% 23% 28% 14% 2	1450
	11th to 20th	Night	28% 8% 15% 27% 17% 5%	1440
	21st to end	Night	23% 9% 15% 29% 21% 3	1440
July	1st to 10th	Night	29% 10% 16% 27% 16% 3	1400
	11th to 20th	Night	19% 10% 16% 28% 21% 5%	1392
	21st to end	Night	23% 8% 19% 32% 16% 3	1623
August	1st to 10th	Night	28% 9% 21% 27% 12% 3	1601
	11th to 20th	Night	25% 8% 15% 32% 19% 2	1600
	21st to end	Night	22% 6% 14% 25% 26% 7%	1938
September	1st to 10th	Night	25% 5% 10% 24% 25% 11%	1866
	11th to 20th	Night	23% 6% 12% 28% 25% 6%	1980
	21st to end	Night	24% 5% 8% 28% 30% 5%	1980
October	1st to 10th	Night	30% 6% 10% 25% 25% 4	1980
	11th to 20th	Night	24% 4 9% 28% 25% 9%	2114
	21st to end	Night	27% 4 11% 26% 23% 9%	2564
November	1st to 10th	Night	20% 4 12% 31% 26% 8%	2405
	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% 12% 38% 24% 6% 1	285
April	1st to 10th	Day	12% 18% 43% 21% 5% 1	403
	11th to 20th	Day	18% 15% 36% 25% 6%	472
	21st to end	Day	19% 14% 33% 23% 10% 2	600
May	1st to 10th	Day	15% 8% 33% 33% 10% 1	603
	11th to 20th	Day	18% 10% 31% 26% 13% 2	625
	21st to end	Day	16% 10% 30% 31% 11% 2	679
June	1st to 10th	Day	7% 5% 27% 33% 22% 7%	630
	11th to 20th	Day	8% 5% 33% 38% 15% 1	630
	21st to end	Day	6% 6% 30% 40% 17% 1	630
July	1st to 10th	Day	5% 4 22% 38% 28% 3	621
	11th to 20th	Day	5% 2 21% 41% 28% 4	618
	21st to end	Day	6% 2 17% 45% 26% 5%	684
August	1st to 10th	Day	7% 2 17% 44% 27% 4	626
	11th to 20th	Day	7% 2 19% 47% 23% 2	615
	21st to end	Day	8% 3 18% 44% 23% 4	533
September	1st to 10th	Day	10% 4 26% 38% 20% 2	383
	11th to 20th	Day	4 5% 28% 36% 22% 4	270
	21st to end	Day	13% 8% 30% 32% 16% 2	270
October	1st to 10th	Day	21% 6% 24% 30% 14% 4	270
	11th to 20th	Day	8% 10% 40% 28% 11% 3	270
	21st to end	Day	21% 13% 26% 30% 9% 1	297
November	1st to 10th	Day	11% 8% 40% 28% 12% 2	270
	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	17% 12% 38% 28% 5%	615
April	1st to 10th	Night	13% 13% 43% 28% 2	540
	11th to 20th	Night	14% 14% 42% 27% 3	533
	21st to end	Night	16% 11% 36% 30% 8%	540
May	1st to 10th	Night	15% 7% 39% 32% 6%	540
	11th to 20th	Night	17% 8% 35% 33% 7% 1	531
	21st to end	Night	17% 7% 32% 33% 10% 1	584
June	1st to 10th	Night	7% 5% 31% 42% 14% 1	540
	11th to 20th	Night	10% 5% 39% 38% 9%	540
	21st to end	Night	4 4 34% 48% 11%	540
July	1st to 10th	Night	5% 3 28% 43% 21% 1	525
	11th to 20th	Night	2 1 25% 54% 17% 1	522
	21st to end	Night	5% 1 19% 53% 21% 1	591
August	1st to 10th	Night	7% 2 17% 51% 22% 1	537
	11th to 20th	Night	8% 2 21% 51% 17%	534
	21st to end	Night	7% 1 22% 47% 21% 1	594
September	1st to 10th	Night	9% 3 28% 49% 11% 1	540
	11th to 20th	Night	6% 4 35% 39% 15% 1	540
	21st to end	Night	10% 6% 34% 37% 13%	540
October	1st to 10th	Night	16% 6% 33% 32% 12%	540
	11th to 20th	Night	13% 10% 36% 31% 10%	674
	21st to end	Night	14% 11% 32% 33% 10%	980
November	1st to 10th	Night	6% 8% 37% 42% 6% 1	925
	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 2024-03-24 22:37:00. Version ac07

Copyright © 2024 Attilla Danko.