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 2024-11-12.

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 4 5% 7% 44%	101131
	Night	10% 7% 3 6% 4 4 4 3 5% 7% 48%	98068
Transparency	Day	38% 6% 13% 25% 16% 2	104810
	Night	35% 6% 13% 26% 18% 3	102517
Seeing	Day	14% 9% 31% 30% 14% 3	15843
	Night	13% 9% 34% 34% 10% 1	25706

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	10% 12% 6% 14% 9% 5% 4 4 5% 6% 26%	2847
	11th to 20th	Day	10% 11% 4 10% 5% 5% 7% 3 6% 7% 32%	2850
	21st to end	Day	9% 11% 6% 13% 6% 5% 4 3 4 5% 34%	3135
February	1st to 10th	Day	10% 10% 5% 11% 7% 5% 4 3 5% 6% 33%	1710
	11th to 20th	Day	9% 10% 3 7% 5% 4 5% 4 6% 6% 41%	1711
	21st to end	Day	10% 9% 2 7% 5% 5% 5% 3 5% 6% 43%	1570
March	1st to 10th	Day	11% 9% 3 7% 4 4 3 2 3 5% 50%	3364
	11th to 20th	Day	11% 8% 3 6% 4 3 3 3 3 6% 50%	3480
	21st to end	Day	23% 12% 3 9% 4 4 4 4 5% 7% 25%	3814
April	1st to 10th	Day	15% 8% 3 5% 5% 4 4 4 5% 6% 42%	2133
	11th to 20th	Day	16% 8% 3 6% 4 3 4 4 6% 5% 40%	2393
	21st to end	Day	20% 7% 3 7% 4 3 4 3 5% 7% 38%	2470
May	1st to 10th	Day	17% 8% 2 7% 5% 4 4 4 5% 7% 35%	4082
	11th to 20th	Day	12% 8% 3 7% 4 4 4 3 5% 6% 45%	4082
	21st to end	Day	15% 6% 3 5% 4 4 5% 5% 6% 7% 40%	4569
June	1st to 10th	Day	7% 5% 2 6% 4 4 4 5% 7% 9% 49%	2660
	11th to 20th	Day	10% 6% 2 6% 5% 4 5% 4 6% 8% 46%	2660
	21st to end	Day	8% 5% 2 5% 4 4 4 3 6% 9% 50%	2660
July	1st to 10th	Day	12% 6% 2 5% 4 4 4 4 6% 8% 44%	4134
	11th to 20th	Day	6% 4 2 5% 3 4 4 4 5% 8% 54%	4120
	21st to end	Day	3 4 1 5% 4 4 5% 4 8% 10% 52%	4465
August	1st to 10th	Day	6% 4 2 6% 5% 5% 5% 4 8% 10% 46%	4104
	11th to 20th	Day	13% 7% 2 7% 4 4 4 4 6% 8% 40%	4041
	21st to end	Day	7% 4 2 5% 5% 4 5% 4 5% 8% 51%	4482
September	1st to 10th	Day	11% 5% 1 5% 3 4 4 3 4 6% 53%	2185
	11th to 20th	Day	10% 5% 2 5% 3 4 4 3 5% 6% 54%	2090
	21st to end	Day	9% 4 1 4 3 3 4 2 5% 6% 58%	2090
October	1st to 10th	Day	13% 6% 2 6% 3 4 3 3 3 5% 52%	1959
	11th to 20th	Day	10% 5% 2 5% 4 3 3 3 4 5% 57%	1900
	21st to end	Day	13% 7% 2 7% 3 3 4 3 4 5% 48%	2083
November	1st to 10th	Day	9% 6% 2 4 4 4 4 3 4 7% 53%	1763
	11th to 20th	Day	10% 6% 2 8% 5% 4 5% 4 5% 6% 46%	1677
	21st to end	Day	13% 10% 3 5% 4 4 3 2 5% 7% 45%	1520
December	1st to 10th	Day	9% 8% 3 7% 4 3 4 4 5% 7% 46%	1520
	11th to 20th	Day	8% 9% 3 9% 5% 4 4 5% 6% 7% 38%	1918
	21st to end	Day	15% 10% 4 14% 7% 4 4 4 5% 6% 27%	2890
January	1st to 10th	Night	7% 13% 4 16% 7% 5% 5% 4 5% 6% 28%	4108
	11th to 20th	Night	7% 10% 3 8% 5% 5% 7% 5% 9% 7% 35%	4120
	21st to end	Night	10% 11% 6% 11% 4 3 4 3 5% 7% 35%	4532
February	1st to 10th	Night	11% 10% 4 9% 6% 4 4 3 4 6% 39%	2470
	11th to 20th	Night	8% 9% 3 8% 4 4 4 4 6% 7% 43%	2372
	21st to end	Night	9% 8% 3 7% 4 3 4 3 5% 5% 49%	1884
March	1st to 10th	Night	12% 7% 2 6% 3 3 3 2 4 5% 54%	3491
	11th to 20th	Night	11% 7% 2 4 3 3 3 3 4 5% 55%	3480
	21st to end	Night	18% 9% 3 8% 4 4 4 4 6% 8% 33%	3817
April	1st to 10th	Night	12% 7% 3 5% 5% 4 4 3 5% 6% 46%	2047
	11th to 20th	Night	12% 8% 3 6% 4 4 4 3 4 7% 46%	1735
	21st to end	Night	16% 7% 3 6% 4 4 3 3 6% 7% 44%	1710
May	1st to 10th	Night	18% 6% 2 6% 3 3 4 3 5% 6% 44%	2823
	11th to 20th	Night	11% 5% 2 4 4 4 4 4 5% 7% 50%	2823
	21st to end	Night	15% 6% 2 5% 4 4 4 4 5% 6% 45%	2995
June	1st to 10th	Night	6% 4 1 4 4 3 4 4 7% 9% 54%	1520
	11th to 20th	Night	7% 5% 1 4 4 5% 4 4 6% 9% 51%	1520
	21st to end	Night	3 3 2 4 3 4 4 4 7% 8% 58%	1458
July	1st to 10th	Night	8% 5% 2 5% 4 4 4 3 6% 7% 53%	2817
	11th to 20th	Night	5% 3 1 3 3 3 3 3 6% 8% 62%	2850
	21st to end	Night	3 3 1 4 3 3 3 3 7% 10% 60%	3098
August	1st to 10th	Night	4 3 1 4 4 4 4 3 6% 11% 56%	2836
	11th to 20th	Night	11% 6% 2 5% 4 3 4 3 5% 8% 49%	2798
	21st to end	Night	7% 5% 2 5% 3 3 3 4 5% 8% 55%	3183
September	1st to 10th	Night	8% 3 1 4 3 3 3 3 4 7% 61%	1991
	11th to 20th	Night	9% 4 2 3 3 3 3 2 4 8% 60%	2090
	21st to end	Night	9% 5% 2 4 3 3 3 3 4 6% 59%	2090
October	1st to 10th	Night	14% 4 2 4 3 4 3 4 5% 5% 52%	2201
	11th to 20th	Night	12% 6% 2 5% 3 3 3 2 4 5% 56%	2280
	21st to end	Night	13% 7% 2 5% 3 2 3 3 4 6% 53%	2513
November	1st to 10th	Night	8% 4 2 5% 2 3 4 3 5% 7% 56%	2535
	11th to 20th	Night	9% 7% 2 6% 4 3 3 3 5% 6% 52%	2523
	21st to end	Night	11% 8% 3 4 4 3 3 3 5% 6% 52%	2660
December	1st to 10th	Night	8% 9% 3 7% 4 4 4 4 5% 6% 46%	2660
	11th to 20th	Night	9% 8% 3 7% 4 3 4 3 5% 6% 48%	3279
	21st to end	Night	16% 13% 5% 11% 5% 3 3 2 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	58% 6% 12% 16% 8%	2848
	11th to 20th	Day	50% 6% 14% 21% 8%	2850
	21st to end	Day	51% 7% 14% 18% 10%	3135
February	1st to 10th	Day	51% 6% 14% 18% 11% 1	1710
	11th to 20th	Day	42% 7% 13% 22% 14% 2	1720
	21st to end	Day	40% 6% 12% 25% 14% 3	1570
March	1st to 10th	Day	38% 4 9% 28% 18% 2	3364
	11th to 20th	Day	36% 5% 10% 30% 16% 2	3480
	21st to end	Day	55% 9% 19% 12% 4	3814
April	1st to 10th	Day	41% 6% 12% 26% 13% 1	2133
	11th to 20th	Day	43% 7% 13% 22% 13% 3	2393
	21st to end	Day	45% 6% 11% 25% 12%	2470
May	1st to 10th	Day	44% 9% 12% 20% 13% 2	4120
	11th to 20th	Day	39% 6% 11% 24% 18% 2	4086
	21st to end	Day	38% 10% 15% 22% 14% 1	4582
June	1st to 10th	Day	30% 8% 17% 31% 12% 2	2660
	11th to 20th	Day	34% 7% 13% 29% 15% 2	2660
	21st to end	Day	30% 8% 15% 29% 15% 4	2660
July	1st to 10th	Day	37% 6% 13% 29% 14% 1	4070
	11th to 20th	Day	28% 6% 12% 32% 19% 3	4051
	21st to end	Day	22% 9% 18% 27% 21% 3	4325
August	1st to 10th	Day	31% 8% 14% 27% 17% 3	4090
	11th to 20th	Day	41% 6% 13% 25% 14% 1	4080
	21st to end	Day	31% 6% 14% 26% 17% 6%	4481
September	1st to 10th	Day	32% 5% 11% 29% 17% 5%	2185
	11th to 20th	Day	30% 5% 13% 32% 19% 1	2090
	21st to end	Day	27% 4 10% 32% 25% 1	2090
October	1st to 10th	Day	21% 3 6% 21% 45% 4	3258
	11th to 20th	Day	22% 3 13% 30% 24% 8%	3140
	21st to end	Day	35% 4 11% 26% 21% 3	3410
November	1st to 10th	Day	32% 4 15% 27% 20% 2	1763
	11th to 20th	Day	37% 6% 14% 24% 18% 1	1677
	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	53% 7% 12% 16% 10% 1	4108
	11th to 20th	Night	44% 6% 15% 24% 10% 1	4120
	21st to end	Night	48% 7% 16% 18% 10% 1	4532
February	1st to 10th	Night	47% 6% 13% 20% 12% 2	2470
	11th to 20th	Night	39% 6% 14% 23% 15% 3	2373
	21st to end	Night	35% 5% 12% 25% 19% 4	1884
March	1st to 10th	Night	33% 6% 9% 27% 22% 3	3491
	11th to 20th	Night	31% 5% 8% 29% 21% 5%	3480
	21st to end	Night	46% 9% 21% 17% 5% 1	3817
April	1st to 10th	Night	37% 7% 11% 26% 17% 2	2047
	11th to 20th	Night	37% 5% 12% 25% 18% 3	1735
	21st to end	Night	40% 6% 12% 23% 17% 1	1710
May	1st to 10th	Night	39% 6% 12% 24% 17% 2	2850
	11th to 20th	Night	31% 7% 13% 24% 23% 2	2824
	21st to end	Night	39% 7% 13% 21% 18% 2	3003
June	1st to 10th	Night	25% 8% 15% 33% 15% 3	1520
	11th to 20th	Night	29% 6% 14% 27% 19% 5%	1520
	21st to end	Night	22% 7% 15% 33% 19% 3	1458
July	1st to 10th	Night	30% 4 14% 33% 16% 3	2772
	11th to 20th	Night	20% 5% 16% 35% 20% 3	2796
	21st to end	Night	18% 7% 16% 33% 24% 2	2999
August	1st to 10th	Night	23% 6% 16% 35% 18% 2	2826
	11th to 20th	Night	34% 5% 15% 27% 18% 2	2825
	21st to end	Night	28% 6% 15% 27% 16% 8%	3183
September	1st to 10th	Night	23% 5% 11% 31% 23% 7%	1991
	11th to 20th	Night	24% 5% 12% 34% 21% 3	2090
	21st to end	Night	27% 4 9% 28% 27% 4	2090
October	1st to 10th	Night	20% 3 7% 16% 48% 5%	3669
	11th to 20th	Night	23% 3 8% 30% 30% 7%	3779
	21st to end	Night	33% 4 9% 31% 21% 2	4137
November	1st to 10th	Night	27% 6% 15% 25% 23% 4	2535
	11th to 20th	Night	33% 4 13% 30% 18% 3	2523
	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% 26% 6% 1	270
	21st to end	Day	15% 8% 43% 24% 9% 1	297
February	1st to 10th	Day	15% 18% 39% 24% 4	270
	11th to 20th	Day	16% 15% 37% 23% 7% 2	270
	21st to end	Day	15% 16% 44% 19% 6%	225
March	1st to 10th	Day	15% 14% 42% 23% 5% 1	270
	11th to 20th	Day	25% 13% 35% 19% 7%	270
	21st to end	Day	30% 13% 36% 16% 3	297
April	1st to 10th	Day	19% 17% 40% 21% 3	313
	11th to 20th	Day	20% 15% 37% 20% 8%	591
	21st to end	Day	24% 15% 32% 20% 8% 2	650
May	1st to 10th	Day	21% 12% 34% 23% 9% 2	653
	11th to 20th	Day	19% 9% 30% 25% 13% 3	675
	21st to end	Day	18% 9% 28% 30% 14% 2	734
June	1st to 10th	Day	5% 6% 24% 39% 22% 4	680
	11th to 20th	Day	8% 8% 31% 35% 16% 2	680
	21st to end	Day	9% 6% 31% 35% 17% 3	680
July	1st to 10th	Day	10% 4 17% 34% 29% 7%	671
	11th to 20th	Day	6% 2 24% 38% 24% 6%	668
	21st to end	Day	6% 3 20% 39% 27% 4	739
August	1st to 10th	Day	8% 2 23% 40% 21% 5%	676
	11th to 20th	Day	9% 5% 21% 38% 25% 3	665
	21st to end	Day	9% 2 22% 41% 21% 5%	724
September	1st to 10th	Day	12% 6% 26% 37% 16% 3	395
	11th to 20th	Day	8% 4 34% 32% 17% 4	300
	21st to end	Day	11% 10% 33% 27% 15% 3	300
October	1st to 10th	Day	17% 7% 29% 27% 14% 6%	300
	11th to 20th	Day	11% 15% 40% 25% 8% 1	300
	21st to end	Day	17% 14% 38% 21% 9% 2	330
November	1st to 10th	Day	17% 13% 38% 21% 9% 2	300
	11th to 20th	Day	12% 14% 44% 21% 7% 1	273
	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	13% 14% 37% 29% 7%	950
	21st to end	Night	16% 7% 42% 29% 6%	1045
February	1st to 10th	Night	16% 11% 38% 30% 5%	950
	11th to 20th	Night	12% 11% 40% 32% 5%	898
	21st to end	Night	14% 13% 42% 26% 4	628
March	1st to 10th	Night	14% 12% 39% 28% 7%	620
	11th to 20th	Night	19% 7% 39% 29% 6%	570
	21st to end	Night	20% 11% 40% 24% 5%	627
April	1st to 10th	Night	14% 17% 40% 24% 5%	570
	11th to 20th	Night	16% 13% 38% 27% 5%	563
	21st to end	Night	19% 10% 34% 29% 8%	570
May	1st to 10th	Night	17% 9% 34% 32% 8%	570
	11th to 20th	Night	13% 8% 32% 34% 12%	561
	21st to end	Night	16% 6% 32% 33% 13%	617
June	1st to 10th	Night	7% 5% 26% 44% 17% 1	570
	11th to 20th	Night	10% 4 32% 42% 12% 1	570
	21st to end	Night	4 4 33% 44% 15%	570
July	1st to 10th	Night	8% 3 20% 40% 28% 1	555
	11th to 20th	Night	3 2 21% 50% 21% 2	552
	21st to end	Night	5% 2 15% 53% 25%	624
August	1st to 10th	Night	5% 3 21% 46% 23% 2	567
	11th to 20th	Night	7% 2 20% 48% 22% 1	564
	21st to end	Night	8% 2 25% 41% 21% 3	627
September	1st to 10th	Night	9% 3 27% 38% 21% 1	570
	11th to 20th	Night	10% 4 30% 40% 15% 1	570
	21st to end	Night	11% 7% 33% 35% 14% 1	570
October	1st to 10th	Night	16% 7% 32% 33% 11% 2	681
	11th to 20th	Night	14% 10% 38% 30% 7%	760
	21st to end	Night	16% 12% 29% 33% 9%	841
November	1st to 10th	Night	10% 11% 35% 36% 7% 1	975
	11th to 20th	Night	13% 11% 42% 29% 6%	956
	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

Page generated at 2024-11-08 21:45:37. Version ac07

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