Fremont(NE)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fremont(NE) clear sky chart from 2005-11-06 to 2024-01-14.

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% 7% 3 6% 5% 3 4 4 5% 7% 44%	74623
	Night	10% 7% 3 5% 5% 3 4 4 5% 7% 48%	75083
Transparency	Day	38% 7% 14% 25% 14% 2	74346
	Night	35% 6% 13% 26% 16% 3	74880
Seeing	Day	14% 9% 30% 30% 15% 3	14644
	Night	13% 9% 34% 34% 10% 1	24663

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	9% 9% 4 7% 7% 4 5% 5% 5% 6% 38%	1707
	11th to 20th	Day	11% 9% 5% 8% 5% 3 5% 4 5% 6% 39%	1647
	21st to end	Day	10% 10% 5% 10% 8% 3 5% 4 5% 6% 34%	1782
February	1st to 10th	Day	11% 9% 5% 10% 8% 3 5% 4 5% 6% 34%	1620
	11th to 20th	Day	10% 10% 4 6% 6% 3 5% 5% 6% 7% 40%	1619
	21st to end	Day	10% 8% 3 7% 5% 4 6% 5% 5% 7% 41%	1480
March	1st to 10th	Day	10% 9% 4 7% 5% 3 4 3 4 6% 44%	1931
	11th to 20th	Day	14% 10% 4 6% 5% 3 3 4 4 7% 40%	1980
	21st to end	Day	19% 12% 4 6% 5% 3 4 4 5% 6% 31%	2178
April	1st to 10th	Day	15% 8% 4 4 5% 3 4 4 5% 6% 42%	2020
	11th to 20th	Day	17% 8% 3 5% 5% 3 4 5% 5% 5% 40%	2265
	21st to end	Day	20% 7% 3 5% 5% 3 4 4 4 7% 39%	2340
May	1st to 10th	Day	17% 7% 3 6% 6% 3 6% 4 5% 7% 37%	2340
	11th to 20th	Day	14% 7% 3 6% 5% 3 4 4 6% 8% 39%	2302
	21st to end	Day	16% 7% 3 5% 5% 3 5% 6% 7% 8% 35%	2582
June	1st to 10th	Day	7% 5% 2 5% 5% 3 4 6% 6% 9% 49%	2520
	11th to 20th	Day	10% 5% 2 5% 5% 3 5% 5% 6% 8% 47%	2520
	21st to end	Day	8% 5% 3 4 4 3 5% 4 6% 8% 50%	2520
July	1st to 10th	Day	8% 4 2 3 5% 2 4 6% 6% 9% 52%	2354
	11th to 20th	Day	5% 4 2 5% 4 3 4 5% 5% 8% 56%	2340
	21st to end	Day	5% 4 2 4 4 3 5% 6% 8% 11% 50%	2546
August	1st to 10th	Day	7% 5% 2 5% 6% 5% 5% 6% 8% 9% 41%	2328
	11th to 20th	Day	8% 4 2 5% 5% 3 5% 4 5% 9% 49%	2301
	21st to end	Day	8% 4 2 4 4 3 4 5% 5% 8% 53%	2552
September	1st to 10th	Day	12% 5% 2 5% 4 3 4 4 4 6% 52%	2070
	11th to 20th	Day	10% 5% 2 4 4 3 4 3 5% 6% 54%	1980
	21st to end	Day	10% 4 1 4 4 2 4 3 4 7% 57%	1980
October	1st to 10th	Day	14% 6% 2 5% 4 3 4 4 4 5% 50%	1856
	11th to 20th	Day	11% 5% 2 5% 4 3 3 4 4 5% 55%	1800
	21st to end	Day	13% 7% 3 6% 4 2 4 4 4 5% 48%	1974
November	1st to 10th	Day	8% 5% 2 3 5% 3 4 3 4 7% 55%	1673
	11th to 20th	Day	10% 6% 2 7% 5% 3 4 5% 5% 6% 47%	1668
	21st to end	Day	13% 9% 3 5% 4 3 4 3 5% 7% 45%	1520
December	1st to 10th	Day	9% 7% 4 7% 4 2 4 5% 5% 7% 46%	1520
	11th to 20th	Day	8% 9% 4 8% 6% 3 4 6% 5% 7% 39%	1918
	21st to end	Day	16% 9% 5% 13% 7% 3 4 5% 5% 6% 27%	2890
January	1st to 10th	Night	6% 9% 4 7% 7% 3 5% 5% 5% 7% 42%	2458
	11th to 20th	Night	9% 10% 5% 8% 6% 3 5% 5% 5% 7% 38%	2386
	21st to end	Night	11% 9% 4 7% 6% 3 3 4 5% 7% 41%	2574
February	1st to 10th	Night	12% 10% 5% 8% 7% 3 4 4 4 6% 39%	2340
	11th to 20th	Night	8% 8% 4 7% 5% 3 4 5% 6% 7% 43%	2243
	21st to end	Night	10% 7% 3 6% 5% 2 5% 4 5% 6% 48%	1776
March	1st to 10th	Night	10% 8% 3 6% 4 2 4 4 5% 6% 48%	2028
	11th to 20th	Night	15% 9% 3 5% 4 2 3 4 4 5% 45%	1980
	21st to end	Night	16% 10% 4 6% 5% 3 4 5% 5% 8% 34%	2178
April	1st to 10th	Night	12% 6% 3 5% 6% 3 5% 4 5% 6% 46%	1940
	11th to 20th	Night	12% 7% 3 5% 5% 3 4 4 4 7% 45%	1643
	21st to end	Night	15% 6% 3 5% 4 3 3 4 6% 7% 44%	1620
May	1st to 10th	Night	15% 5% 2 6% 4 2 5% 6% 6% 8% 40%	1620
	11th to 20th	Night	12% 5% 2 5% 5% 3 4 5% 5% 8% 46%	1593
	21st to end	Night	13% 6% 3 5% 5% 3 4 5% 5% 8% 41%	1691
June	1st to 10th	Night	6% 4 1 4 4 3 3 4 6% 9% 55%	1440
	11th to 20th	Night	7% 4 2 3 4 3 4 5% 5% 9% 52%	1440
	21st to end	Night	3 2 3 3 3 2 4 5% 7% 8% 58%	1382
July	1st to 10th	Night	7% 3 2 4 4 2 4 4 5% 7% 56%	1601
	11th to 20th	Night	3 2 1 3 4 3 3 4 7% 9% 61%	1620
	21st to end	Night	4 3 2 3 3 2 4 4 7% 11% 59%	1772
August	1st to 10th	Night	5% 3 2 4 5% 3 4 5% 7% 9% 53%	1611
	11th to 20th	Night	6% 3 2 4 4 2 3 4 5% 9% 58%	1600
	21st to end	Night	7% 4 2 4 4 2 4 4 4 8% 56%	1804
September	1st to 10th	Night	9% 3 1 3 3 2 3 3 4 6% 60%	1886
	11th to 20th	Night	9% 4 2 3 3 2 4 3 4 8% 59%	1980
	21st to end	Night	9% 4 2 4 3 2 3 3 4 6% 59%	1980
October	1st to 10th	Night	15% 4 2 3 4 3 4 5% 5% 5% 50%	2085
	11th to 20th	Night	13% 6% 2 4 3 2 3 3 4 5% 55%	2160
	21st to end	Night	13% 7% 3 5% 3 1 3 4 4 6% 53%	2380
November	1st to 10th	Night	7% 4 2 4 3 2 4 4 4 7% 58%	2405
	11th to 20th	Night	9% 6% 3 5% 5% 2 3 4 4 6% 52%	2509
	21st to end	Night	11% 7% 3 4 4 2 3 3 4 6% 52%	2660
December	1st to 10th	Night	8% 8% 3 6% 5% 3 5% 5% 5% 6% 46%	2660
	11th to 20th	Night	9% 8% 3 6% 5% 2 4 4 5% 7% 48%	3279
	21st to end	Night	16% 13% 5% 10% 6% 2 4 3 4 5% 32%	4759

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% 5% 15% 21% 12% 1	1708
	11th to 20th	Day	45% 6% 14% 23% 11% 1	1647
	21st to end	Day	51% 5% 15% 20% 9% 1	1782
February	1st to 10th	Day	50% 6% 14% 18% 11% 1	1620
	11th to 20th	Day	43% 7% 13% 22% 14% 2	1628
	21st to end	Day	42% 6% 12% 23% 13% 3	1480
March	1st to 10th	Day	41% 5% 13% 27% 12% 2	1931
	11th to 20th	Day	45% 5% 11% 24% 14% 2	1980
	21st to end	Day	53% 7% 15% 18% 7% 1	2178
April	1st to 10th	Day	42% 6% 13% 25% 13% 1	2020
	11th to 20th	Day	44% 6% 12% 22% 12% 3	2265
	21st to end	Day	46% 5% 11% 26% 12%	2340
May	1st to 10th	Day	47% 7% 13% 19% 14% 1	2340
	11th to 20th	Day	41% 7% 15% 24% 12%	2306
	21st to end	Day	44% 9% 15% 19% 11% 1	2582
June	1st to 10th	Day	30% 8% 17% 30% 13% 2	2520
	11th to 20th	Day	33% 7% 14% 28% 16% 2	2520
	21st to end	Day	30% 8% 16% 28% 15% 3	2520
July	1st to 10th	Day	28% 8% 15% 31% 16% 2	2290
	11th to 20th	Day	26% 7% 14% 28% 19% 6%	2271
	21st to end	Day	24% 9% 19% 29% 17% 1	2405
August	1st to 10th	Day	35% 11% 16% 25% 11% 2	2314
	11th to 20th	Day	30% 8% 15% 30% 16% 1	2301
	21st to end	Day	29% 6% 13% 27% 19% 6%	2552
September	1st to 10th	Day	33% 5% 11% 28% 17% 5%	2070
	11th to 20th	Day	31% 5% 12% 33% 18% 1	1980
	21st to end	Day	28% 4 10% 32% 24% 1	1980
October	1st to 10th	Day	36% 5% 11% 26% 20% 2	1856
	11th to 20th	Day	32% 5% 9% 26% 22% 6%	1800
	21st to end	Day	39% 5% 13% 21% 19% 4	1974
November	1st to 10th	Day	30% 4 15% 27% 21% 2	1673
	11th to 20th	Day	37% 6% 13% 24% 18% 1	1668
	21st to end	Day	41% 4 11% 29% 14% 2	1520
December	1st to 10th	Day	37% 6% 15% 27% 13% 2	1520
	11th to 20th	Day	42% 7% 17% 28% 6%	1915
	21st to end	Day	57% 7% 10% 19% 7% 1	2890
January	1st to 10th	Night	41% 6% 14% 23% 16% 1	2458
	11th to 20th	Night	45% 6% 15% 25% 9%	2386
	21st to end	Night	43% 5% 15% 24% 11% 1	2574
February	1st to 10th	Night	48% 5% 13% 20% 12% 2	2340
	11th to 20th	Night	39% 6% 15% 23% 14% 3	2244
	21st to end	Night	37% 5% 12% 25% 18% 4	1776
March	1st to 10th	Night	37% 6% 12% 29% 14% 3	2028
	11th to 20th	Night	41% 5% 9% 25% 17% 3	1980
	21st to end	Night	49% 6% 14% 20% 9% 1	2178
April	1st to 10th	Night	38% 7% 11% 25% 17% 2	1940
	11th to 20th	Night	38% 6% 12% 25% 16% 2	1643
	21st to end	Night	40% 6% 12% 23% 17% 1	1620
May	1st to 10th	Night	40% 6% 14% 24% 14% 2	1620
	11th to 20th	Night	36% 8% 15% 23% 17% 1	1594
	21st to end	Night	40% 9% 17% 19% 13% 2	1692
June	1st to 10th	Night	25% 8% 15% 34% 16% 2	1440
	11th to 20th	Night	29% 6% 14% 27% 19% 5%	1440
	21st to end	Night	22% 7% 15% 34% 19% 3	1382
July	1st to 10th	Night	26% 5% 15% 30% 20% 4	1556
	11th to 20th	Night	19% 7% 19% 30% 20% 6%	1566
	21st to end	Night	18% 6% 17% 36% 20% 3	1673
August	1st to 10th	Night	27% 9% 18% 30% 15% 1	1601
	11th to 20th	Night	25% 5% 15% 33% 20% 3	1600
	21st to end	Night	26% 6% 13% 26% 20% 9%	1804
September	1st to 10th	Night	24% 5% 12% 30% 21% 7%	1886
	11th to 20th	Night	25% 5% 12% 35% 20% 3	1980
	21st to end	Night	27% 5% 9% 28% 27% 4	1980
October	1st to 10th	Night	34% 6% 12% 23% 23% 2	2085
	11th to 20th	Night	32% 4 8% 24% 26% 6%	2160
	21st to end	Night	33% 5% 12% 23% 24% 3	2380
November	1st to 10th	Night	25% 6% 14% 26% 24% 4	2405
	11th to 20th	Night	33% 4 12% 30% 18% 3	2509
	21st to end	Night	34% 5% 12% 28% 19% 2	2660
December	1st to 10th	Night	38% 6% 14% 28% 13% 1	2660
	11th to 20th	Night	36% 5% 15% 34% 9% 1	3281
	21st to end	Night	55% 5% 10% 21% 7% 1	4759

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	16% 13% 37% 24% 8% 2	270
	11th to 20th	Day	18% 13% 36% 25% 6% 2	249
	21st to end	Day	16% 8% 45% 23% 7%	264
February	1st to 10th	Day	14% 19% 39% 25% 3	240
	11th to 20th	Day	18% 15% 38% 22% 7% 1	240
	21st to end	Day	16% 17% 42% 20% 5% 1	198
March	1st to 10th	Day	15% 14% 43% 22% 5% 2	240
	11th to 20th	Day	26% 13% 35% 18% 7%	240
	21st to end	Day	30% 14% 35% 17% 4	264
April	1st to 10th	Day	18% 16% 40% 23% 3	280
	11th to 20th	Day	21% 14% 36% 20% 9%	543
	21st to end	Day	24% 14% 32% 20% 9% 2	600
May	1st to 10th	Day	21% 12% 33% 23% 9% 2	603
	11th to 20th	Day	19% 9% 31% 25% 13% 3	625
	21st to end	Day	19% 8% 27% 30% 15% 2	679
June	1st to 10th	Day	6% 6% 23% 39% 22% 4	630
	11th to 20th	Day	9% 6% 30% 36% 17% 3	630
	21st to end	Day	9% 6% 30% 36% 17% 3	630
July	1st to 10th	Day	9% 3 17% 34% 30% 7%	621
	11th to 20th	Day	6% 2 24% 38% 24% 6%	618
	21st to end	Day	6% 3 20% 40% 27% 3	684
August	1st to 10th	Day	8% 2 21% 42% 22% 5%	626
	11th to 20th	Day	8% 4 20% 39% 27% 3	615
	21st to end	Day	9% 2 21% 41% 22% 5%	671
September	1st to 10th	Day	13% 6% 26% 36% 17% 3	360
	11th to 20th	Day	9% 4 34% 31% 18% 4	270
	21st to end	Day	12% 10% 33% 29% 14% 2	270
October	1st to 10th	Day	19% 7% 29% 26% 13% 6%	270
	11th to 20th	Day	12% 16% 39% 24% 8% 1	270
	21st to end	Day	18% 14% 36% 21% 10% 2	297
November	1st to 10th	Day	15% 13% 39% 21% 9% 3	270
	11th to 20th	Day	13% 14% 44% 21% 7% 1	270
	21st to end	Day	22% 11% 32% 24% 8% 1	270
December	1st to 10th	Day	9% 12% 41% 31% 6% 1	270
	11th to 20th	Day	16% 13% 33% 27% 10%	270
	21st to end	Day	21% 12% 42% 21% 4	297
January	1st to 10th	Night	12% 12% 37% 32% 7% 1	950
	11th to 20th	Night	14% 13% 37% 29% 7%	918
	21st to end	Night	17% 7% 43% 28% 5%	990
February	1st to 10th	Night	16% 11% 38% 30% 5%	900
	11th to 20th	Night	12% 11% 41% 31% 5%	849
	21st to end	Night	15% 13% 42% 26% 5% 1	592
March	1st to 10th	Night	14% 13% 39% 27% 7%	588
	11th to 20th	Night	20% 7% 38% 29% 6%	540
	21st to end	Night	20% 11% 39% 24% 6%	594
April	1st to 10th	Night	14% 16% 41% 24% 5%	540
	11th to 20th	Night	16% 12% 38% 28% 5%	533
	21st to end	Night	19% 11% 33% 29% 9%	540
May	1st to 10th	Night	16% 9% 33% 33% 8%	540
	11th to 20th	Night	14% 9% 32% 32% 12%	531
	21st to end	Night	16% 6% 32% 33% 13% 1	584
June	1st to 10th	Night	7% 5% 25% 44% 18% 1	540
	11th to 20th	Night	9% 3 32% 43% 12% 1	540
	21st to end	Night	4 3 33% 44% 16%	540
July	1st to 10th	Night	7% 2 19% 42% 29% 1	525
	11th to 20th	Night	3 2 21% 49% 22% 2	522
	21st to end	Night	5% 2 14% 54% 24%	591
August	1st to 10th	Night	5% 3 20% 45% 24% 3	537
	11th to 20th	Night	7% 2 20% 47% 23% 1	534
	21st to end	Night	8% 2 24% 41% 22% 3	594
September	1st to 10th	Night	9% 3 28% 37% 21% 1	540
	11th to 20th	Night	11% 4 29% 40% 16% 1	540
	21st to end	Night	11% 6% 34% 34% 14% 1	540
October	1st to 10th	Night	17% 6% 33% 32% 11% 2	645
	11th to 20th	Night	15% 10% 37% 30% 8%	720
	21st to end	Night	16% 11% 29% 34% 9%	796
November	1st to 10th	Night	9% 11% 36% 36% 8% 1	925
	11th to 20th	Night	13% 11% 42% 29% 6%	950
	21st to end	Night	15% 11% 36% 28% 9%	950
December	1st to 10th	Night	13% 11% 40% 30% 6%	950
	11th to 20th	Night	14% 11% 35% 34% 6%	950
	21st to end	Night	18% 12% 36% 29% 5%	1045

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