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 2026-01-02.

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	11% 7% 3 7% 4 4 4 3 5% 7% 45%	126856
	Night	10% 7% 3 7% 4 4 4 3 5% 7% 48%	124681
Transparency	Day	38% 6% 13% 25% 16% 2	130496
	Night	35% 5% 12% 26% 18% 3	129105
Seeing	Day	14% 9% 31% 29% 14% 3	17381
	Night	13% 9% 34% 33% 10% 1	27315

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% 12% 6% 16% 8% 5% 4 4 5% 6% 25%	4086
	11th to 20th	Day	7% 9% 3 10% 5% 4 6% 4 6% 6% 40%	4080
	21st to end	Day	6% 9% 5% 10% 5% 4 5% 3 5% 6% 41%	4488
February	1st to 10th	Day	10% 11% 5% 10% 7% 5% 4 3 5% 6% 33%	1800
	11th to 20th	Day	9% 11% 4 7% 5% 4 5% 4 6% 6% 40%	1804
	21st to end	Day	9% 8% 2 7% 4 5% 5% 3 5% 6% 45%	1650
March	1st to 10th	Day	13% 8% 3 6% 3 3 2 2 3 4 52%	4838
	11th to 20th	Day	11% 7% 2 5% 3 3 4 3 4 7% 51%	4980
	21st to end	Day	20% 11% 3 9% 4 4 4 4 6% 7% 28%	5462
April	1st to 10th	Day	15% 8% 3 5% 4 4 4 4 5% 6% 42%	2245
	11th to 20th	Day	16% 8% 3 5% 4 3 4 4 6% 6% 41%	2521
	21st to end	Day	20% 7% 3 7% 4 4 4 3 4 7% 38%	2600
May	1st to 10th	Day	13% 7% 2 7% 4 4 4 3 5% 7% 45%	5862
	11th to 20th	Day	13% 6% 2 6% 3 3 3 2 4 6% 50%	5862
	21st to end	Day	17% 7% 3 6% 4 4 5% 4 6% 7% 37%	6568
June	1st to 10th	Day	7% 5% 2 6% 4 4 4 4 7% 9% 48%	2800
	11th to 20th	Day	9% 6% 2 6% 4 4 5% 4 6% 8% 47%	2800
	21st to end	Day	8% 6% 2 5% 4 4 4 3 6% 8% 49%	2800
July	1st to 10th	Day	10% 5% 2 5% 4 4 5% 4 6% 8% 47%	5914
	11th to 20th	Day	7% 5% 2 6% 4 4 5% 4 6% 9% 48%	5900
	21st to end	Day	5% 5% 2 5% 4 4 5% 4 8% 10% 49%	6422
August	1st to 10th	Day	6% 5% 2 6% 4 5% 5% 4 8% 10% 46%	4234
	11th to 20th	Day	13% 7% 2 7% 4 4 4 4 6% 8% 40%	4171
	21st to end	Day	7% 4 2 5% 5% 4 5% 4 5% 8% 51%	4624
September	1st to 10th	Day	11% 5% 1 5% 3 4 4 3 4 6% 52%	2300
	11th to 20th	Day	10% 5% 2 5% 4 4 4 3 5% 6% 53%	2200
	21st to end	Day	9% 4 2 4 3 3 3 2 5% 6% 58%	2200
October	1st to 10th	Day	13% 6% 2 6% 3 4 3 3 4 5% 53%	2062
	11th to 20th	Day	10% 5% 2 5% 4 3 3 3 4 5% 56%	2000
	21st to end	Day	13% 8% 3 7% 3 3 4 3 4 5% 47%	2192
November	1st to 10th	Day	9% 7% 2 4 4 4 4 3 4 7% 53%	1853
	11th to 20th	Day	10% 6% 2 7% 4 3 5% 3 5% 7% 48%	1843
	21st to end	Day	13% 10% 3 5% 5% 3 3 2 5% 7% 44%	1680
December	1st to 10th	Day	5% 5% 3 6% 4 4 5% 4 4 6% 53%	2690
	11th to 20th	Day	8% 9% 3 10% 5% 4 4 4 5% 7% 41%	3088
	21st to end	Day	16% 9% 4 13% 5% 4 4 3 4 5% 33%	4237
January	1st to 10th	Night	9% 12% 4 18% 8% 5% 4 3 5% 6% 25%	5902
	11th to 20th	Night	6% 8% 3 8% 5% 5% 7% 5% 8% 6% 39%	5900
	21st to end	Night	7% 9% 5% 10% 5% 4 4 3 5% 6% 42%	6490
February	1st to 10th	Night	11% 10% 4 9% 6% 4 4 4 5% 6% 39%	2600
	11th to 20th	Night	8% 9% 3 8% 4 4 4 4 6% 7% 42%	2500
	21st to end	Night	9% 7% 3 6% 4 3 4 3 5% 5% 50%	1980
March	1st to 10th	Night	14% 6% 2 5% 3 3 3 3 4 5% 52%	5019
	11th to 20th	Night	11% 6% 2 4 3 3 3 3 5% 6% 55%	4980
	21st to end	Night	15% 10% 3 7% 4 4 4 4 5% 8% 36%	5467
April	1st to 10th	Night	12% 7% 3 5% 5% 4 4 3 5% 6% 46%	2155
	11th to 20th	Night	12% 8% 3 6% 4 4 4 4 5% 7% 46%	1827
	21st to end	Night	16% 7% 3 5% 3 4 3 3 6% 7% 43%	1800
May	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 5% 6% 50%	4053
	11th to 20th	Night	12% 4 1 4 3 3 4 4 5% 6% 53%	4053
	21st to end	Night	17% 7% 3 6% 4 4 4 3 5% 6% 43%	4306
June	1st to 10th	Night	6% 4 1 4 4 3 3 4 6% 9% 54%	1600
	11th to 20th	Night	7% 5% 1 4 4 5% 4 4 6% 9% 52%	1600
	21st to end	Night	4 3 2 4 3 3 4 4 7% 8% 58%	1534
July	1st to 10th	Night	7% 5% 2 5% 4 4 4 3 5% 7% 55%	4031
	11th to 20th	Night	6% 4 2 5% 3 4 4 3 6% 9% 53%	4077
	21st to end	Night	4 4 1 5% 4 4 4 3 7% 9% 55%	4449
August	1st to 10th	Night	4 3 1 4 4 4 4 4 6% 11% 55%	2926
	11th to 20th	Night	11% 5% 2 5% 4 3 4 3 5% 8% 50%	2888
	21st to end	Night	6% 5% 2 5% 3 4 4 4 5% 8% 54%	3283
September	1st to 10th	Night	9% 3 1 4 3 3 3 3 4 7% 61%	2096
	11th to 20th	Night	8% 4 2 3 3 3 3 3 5% 7% 59%	2200
	21st to end	Night	9% 5% 2 5% 3 3 3 3 4 6% 59%	2200
October	1st to 10th	Night	14% 5% 2 4 3 4 3 4 5% 5% 51%	2317
	11th to 20th	Night	12% 6% 2 5% 3 3 3 3 4 5% 55%	2400
	21st to end	Night	13% 7% 2 5% 3 2 3 3 4 6% 53%	2645
November	1st to 10th	Night	8% 5% 2 5% 2 3 4 3 5% 7% 56%	2665
	11th to 20th	Night	9% 7% 2 6% 4 3 3 3 5% 6% 53%	2774
	21st to end	Night	11% 8% 3 5% 4 3 3 3 5% 6% 51%	2940
December	1st to 10th	Night	5% 7% 2 6% 4 4 4 4 6% 6% 52%	4720
	11th to 20th	Night	9% 7% 3 8% 4 3 4 3 5% 7% 46%	5339
	21st to end	Night	15% 13% 4 10% 4 4 4 3 4 5% 34%	6965

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	59% 6% 11% 18% 6%	4087
	11th to 20th	Day	44% 4 14% 20% 16% 2	4080
	21st to end	Day	43% 6% 14% 24% 12% 1	4488
February	1st to 10th	Day	51% 6% 14% 18% 11% 1	1800
	11th to 20th	Day	44% 6% 12% 21% 15% 2	1813
	21st to end	Day	38% 6% 12% 25% 15% 3	1650
March	1st to 10th	Day	37% 3 8% 27% 18% 6%	4838
	11th to 20th	Day	34% 4 8% 27% 23% 4	4980
	21st to end	Day	53% 7% 19% 15% 4 1	5464
April	1st to 10th	Day	41% 6% 12% 26% 13% 1	2245
	11th to 20th	Day	42% 7% 13% 23% 13% 3	2521
	21st to end	Day	46% 5% 10% 25% 12% 1	2600
May	1st to 10th	Day	38% 7% 11% 25% 18% 1	5900
	11th to 20th	Day	36% 5% 9% 22% 23% 4	5866
	21st to end	Day	43% 8% 12% 22% 15% 1	6582
June	1st to 10th	Day	31% 7% 17% 30% 13% 2	2800
	11th to 20th	Day	33% 7% 14% 29% 16% 2	2800
	21st to end	Day	31% 7% 15% 28% 15% 4	2800
July	1st to 10th	Day	34% 5% 12% 33% 15% 1	5850
	11th to 20th	Day	33% 6% 13% 30% 16% 2	5831
	21st to end	Day	27% 8% 19% 27% 17% 2	6240
August	1st to 10th	Day	31% 8% 15% 27% 17% 3	4220
	11th to 20th	Day	40% 6% 13% 26% 14% 1	4210
	21st to end	Day	31% 6% 14% 26% 18% 6%	4623
September	1st to 10th	Day	33% 5% 11% 29% 17% 5%	2300
	11th to 20th	Day	30% 6% 13% 32% 18% 1	2200
	21st to end	Day	27% 4 10% 32% 26% 2	2200
October	1st to 10th	Day	21% 3 6% 22% 44% 4	3361
	11th to 20th	Day	22% 3 14% 29% 24% 7%	3240
	21st to end	Day	36% 4 11% 26% 21% 3	3519
November	1st to 10th	Day	32% 4 15% 27% 21% 2	1853
	11th to 20th	Day	36% 6% 14% 25% 18% 1	1843
	21st to end	Day	41% 4 12% 28% 13% 2	1680
December	1st to 10th	Day	32% 5% 17% 29% 16% 1	2690
	11th to 20th	Day	43% 5% 18% 23% 10% 1	3085
	21st to end	Day	53% 5% 11% 22% 8% 1	4237
January	1st to 10th	Night	57% 6% 11% 15% 10%	5902
	11th to 20th	Night	40% 5% 15% 22% 16% 1	5900
	21st to end	Night	43% 5% 13% 21% 17% 2	6490
February	1st to 10th	Night	46% 6% 13% 21% 13% 2	2600
	11th to 20th	Night	40% 6% 14% 22% 15% 3	2501
	21st to end	Night	34% 5% 12% 25% 20% 4	1980
March	1st to 10th	Night	34% 4 7% 29% 22% 3	5019
	11th to 20th	Night	30% 4 7% 26% 27% 6%	4980
	21st to end	Night	45% 8% 18% 23% 6% 1	5467
April	1st to 10th	Night	37% 6% 11% 26% 18% 2	2155
	11th to 20th	Night	37% 5% 12% 25% 17% 3	1827
	21st to end	Night	40% 7% 12% 24% 16% 1	1800
May	1st to 10th	Night	35% 5% 10% 27% 22% 2	4080
	11th to 20th	Night	30% 6% 12% 18% 27% 6%	4054
	21st to end	Night	41% 6% 13% 23% 15% 2	4314
June	1st to 10th	Night	26% 8% 14% 33% 16% 3	1600
	11th to 20th	Night	29% 6% 14% 27% 19% 5%	1600
	21st to end	Night	23% 7% 15% 33% 20% 3	1534
July	1st to 10th	Night	29% 4 13% 34% 17% 3	3988
	11th to 20th	Night	28% 6% 14% 31% 18% 2	4026
	21st to end	Night	24% 7% 17% 29% 21% 1	4320
August	1st to 10th	Night	23% 6% 16% 34% 18% 2	2916
	11th to 20th	Night	34% 5% 15% 27% 18% 2	2915
	21st to end	Night	28% 6% 14% 27% 16% 8%	3283
September	1st to 10th	Night	24% 5% 12% 31% 22% 6%	2096
	11th to 20th	Night	25% 5% 13% 34% 20% 3	2200
	21st to end	Night	27% 4 9% 28% 27% 5%	2200
October	1st to 10th	Night	21% 3 7% 16% 48% 5%	3785
	11th to 20th	Night	23% 3 9% 29% 30% 7%	3899
	21st to end	Night	33% 3 9% 31% 21% 2	4269
November	1st to 10th	Night	27% 6% 14% 26% 23% 4	2665
	11th to 20th	Night	32% 4 12% 30% 18% 3	2774
	21st to end	Night	35% 5% 12% 28% 18% 2	2940
December	1st to 10th	Night	31% 5% 15% 32% 16% 1	4720
	11th to 20th	Night	38% 5% 15% 30% 12%	5341
	21st to end	Night	53% 4 11% 23% 8% 1	6965

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	15% 13% 39% 25% 8% 2	303
	11th to 20th	Day	17% 14% 37% 25% 5% 1	300
	21st to end	Day	14% 8% 45% 23% 8% 1	330
February	1st to 10th	Day	16% 18% 39% 23% 4	300
	11th to 20th	Day	16% 16% 38% 22% 7% 2	300
	21st to end	Day	14% 15% 44% 20% 6%	249
March	1st to 10th	Day	16% 14% 43% 21% 4 1	300
	11th to 20th	Day	24% 13% 35% 20% 7%	300
	21st to end	Day	30% 13% 37% 17% 3	330
April	1st to 10th	Day	19% 18% 39% 21% 3	345
	11th to 20th	Day	21% 15% 36% 20% 8%	639
	21st to end	Day	25% 15% 32% 19% 8% 1	700
May	1st to 10th	Day	20% 12% 33% 23% 11% 2	703
	11th to 20th	Day	19% 9% 30% 25% 14% 3	725
	21st to end	Day	18% 9% 28% 30% 14% 2	789
June	1st to 10th	Day	6% 7% 24% 38% 21% 4	730
	11th to 20th	Day	8% 7% 31% 36% 16% 2	730
	21st to end	Day	9% 6% 32% 34% 16% 2	730
July	1st to 10th	Day	9% 4 18% 34% 28% 7%	721
	11th to 20th	Day	6% 3 24% 38% 23% 5%	718
	21st to end	Day	6% 3 21% 40% 26% 4	794
August	1st to 10th	Day	9% 2 23% 41% 20% 5%	726
	11th to 20th	Day	8% 4 21% 39% 25% 3	715
	21st to end	Day	8% 2 23% 41% 21% 4	778
September	1st to 10th	Day	13% 7% 25% 37% 15% 3	430
	11th to 20th	Day	8% 4 37% 31% 16% 4	330
	21st to end	Day	11% 10% 32% 27% 16% 3	330
October	1st to 10th	Day	17% 8% 29% 27% 14% 5%	330
	11th to 20th	Day	12% 15% 42% 23% 8% 1	330
	21st to end	Day	18% 15% 37% 20% 9% 1	363
November	1st to 10th	Day	16% 14% 40% 21% 8% 2	330
	11th to 20th	Day	14% 14% 44% 22% 6% 1	330
	21st to end	Day	22% 14% 33% 22% 7% 2	330
December	1st to 10th	Day	9% 14% 42% 29% 5% 1	330
	11th to 20th	Day	17% 16% 33% 25% 9%	330
	21st to end	Day	20% 12% 42% 21% 5%	363
January	1st to 10th	Night	12% 12% 37% 32% 7%	1006
	11th to 20th	Night	13% 14% 38% 28% 7%	1000
	21st to end	Night	15% 7% 43% 29% 6%	1100
February	1st to 10th	Night	15% 12% 38% 30% 5%	1000
	11th to 20th	Night	12% 12% 41% 31% 4	946
	21st to end	Night	14% 13% 42% 26% 4	660
March	1st to 10th	Night	15% 12% 38% 27% 7%	652
	11th to 20th	Night	19% 8% 39% 29% 6%	600
	21st to end	Night	20% 11% 41% 23% 5%	660
April	1st to 10th	Night	14% 17% 40% 24% 5%	600
	11th to 20th	Night	16% 14% 39% 27% 5%	593
	21st to end	Night	19% 11% 34% 29% 8%	600
May	1st to 10th	Night	17% 9% 32% 33% 9%	600
	11th to 20th	Night	14% 9% 32% 34% 12%	591
	21st to end	Night	16% 6% 32% 33% 13%	650
June	1st to 10th	Night	7% 6% 25% 44% 18% 1	600
	11th to 20th	Night	9% 3 32% 42% 12% 1	600
	21st to end	Night	5% 5% 33% 44% 15%	600
July	1st to 10th	Night	8% 3 20% 41% 28% 1	585
	11th to 20th	Night	3 3 21% 50% 21% 2	582
	21st to end	Night	5% 2 15% 54% 24%	657
August	1st to 10th	Night	5% 3 21% 46% 22% 2	597
	11th to 20th	Night	7% 2 20% 47% 23% 1	594
	21st to end	Night	8% 2 25% 41% 21% 2	660
September	1st to 10th	Night	9% 4 27% 39% 20% 1	600
	11th to 20th	Night	10% 4 30% 41% 15% 1	600
	21st to end	Night	10% 7% 32% 35% 16% 1	600
October	1st to 10th	Night	16% 7% 32% 32% 11% 2	717
	11th to 20th	Night	15% 11% 38% 29% 7%	800
	21st to end	Night	16% 12% 29% 33% 9%	885
November	1st to 10th	Night	10% 12% 36% 35% 7% 1	1025
	11th to 20th	Night	12% 11% 42% 29% 5%	1050
	21st to end	Night	16% 11% 36% 28% 9%	1050
December	1st to 10th	Night	13% 11% 40% 30% 6%	1050
	11th to 20th	Night	14% 12% 36% 32% 6%	1050
	21st to end	Night	18% 11% 36% 30% 5%	1155

Page generated at 2025-12-30 00:14:09. Version ac07

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