Western Nebraska Star Gaze
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Western Nebraska Star Gaze clear sky chart from 2005-11-06 to 2025-10-04.

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	6% 5% 2 5% 3 3 4 3 6% 8% 54%	135146
	Night	6% 6% 2 6% 4 4 4 4 6% 7% 52%	131667
Transparency	Day	28% 4 12% 28% 22% 6%	130002
	Night	31% 4 13% 27% 20% 5%	127818
Seeing	Day	10% 8% 28% 30% 19% 5%	17053
	Night	10% 7% 36% 38% 9%	26933

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	4 8% 4 10% 4 3 4 3 4 6% 50%	3638
	11th to 20th	Day	3 9% 3 10% 5% 4 5% 4 6% 6% 44%	3640
	21st to end	Day	2 4 2 6% 4 3 3 3 5% 7% 60%	4157
February	1st to 10th	Day	4 10% 4 8% 4 4 4 5% 5% 7% 44%	1850
	11th to 20th	Day	5% 9% 3 8% 5% 4 4 3 6% 7% 47%	1949
	21st to end	Day	4 8% 3 5% 4 4 4 3 5% 6% 54%	1650
March	1st to 10th	Day	8% 10% 3 4 2 3 3 3 4 7% 53%	4500
	11th to 20th	Day	8% 6% 2 4 2 3 3 3 5% 6% 59%	4643
	21st to end	Day	8% 8% 2 6% 4 4 4 4 7% 9% 45%	5969
April	1st to 10th	Day	10% 7% 2 5% 4 3 4 4 6% 7% 49%	2400
	11th to 20th	Day	13% 8% 2 5% 4 4 4 4 6% 8% 43%	2371
	21st to end	Day	11% 7% 3 5% 4 4 5% 4 6% 7% 45%	2501
May	1st to 10th	Day	9% 5% 1 5% 4 4 4 4 5% 7% 51%	5900
	11th to 20th	Day	9% 5% 2 5% 4 4 5% 4 6% 9% 47%	6136
	21st to end	Day	13% 6% 2 5% 3 3 4 3 5% 7% 48%	6925
June	1st to 10th	Day	7% 4 1 3 4 3 4 4 7% 9% 54%	2800
	11th to 20th	Day	7% 3 1 5% 3 4 4 3 7% 8% 54%	2800
	21st to end	Day	4 2 1 4 3 4 4 4 6% 9% 59%	2800
July	1st to 10th	Day	5% 3 1 4 3 3 4 4 6% 7% 59%	6339
	11th to 20th	Day	4 3 1 3 3 4 4 4 7% 11% 56%	6340
	21st to end	Day	4 4 1 5% 3 4 5% 4 7% 10% 53%	6903
August	1st to 10th	Day	8% 3 1 4 4 4 4 5% 7% 10% 52%	6087
	11th to 20th	Day	3 3 2 3 3 3 4 4 6% 8% 61%	5366
	21st to end	Day	7% 5% 2 5% 4 4 5% 4 6% 8% 50%	5984
September	1st to 10th	Day	5% 3 1 4 3 3 3 3 4 7% 64%	2400
	11th to 20th	Day	7% 3 1 2 3 3 3 2 5% 7% 63%	2290
	21st to end	Day	8% 4 1 3 3 2 2 2 4 6% 65%	2200
October	1st to 10th	Day	6% 3 1 3 2 1 2 1 3 4 74%	3430
	11th to 20th	Day	6% 4 2 4 3 3 2 2 4 6% 62%	3129
	21st to end	Day	8% 7% 2 5% 3 3 3 3 4 6% 56%	3091
November	1st to 10th	Day	5% 6% 2 3 3 3 3 4 6% 7% 59%	1763
	11th to 20th	Day	4 5% 2 4 2 3 3 3 5% 7% 61%	1800
	21st to end	Day	4 7% 2 5% 3 3 3 2 5% 7% 59%	1745
December	1st to 10th	Day	3 4 2 4 3 2 3 2 5% 6% 65%	2620
	11th to 20th	Day	2 3 1 4 2 3 3 2 5% 9% 65%	3026
	21st to end	Day	6% 9% 3 6% 4 4 4 3 6% 6% 49%	4004
January	1st to 10th	Night	5% 10% 4 9% 4 3 3 3 5% 6% 48%	6327
	11th to 20th	Night	2 6% 4 8% 5% 4 5% 4 6% 8% 48%	6340
	21st to end	Night	2 5% 3 7% 5% 4 5% 4 4 6% 56%	6864
February	1st to 10th	Night	4 10% 4 9% 4 4 5% 3 5% 7% 45%	2548
	11th to 20th	Night	4 10% 3 9% 5% 4 4 3 6% 8% 44%	2338
	21st to end	Night	4 8% 3 7% 4 4 3 3 5% 6% 53%	1980
March	1st to 10th	Night	9% 11% 2 5% 3 3 3 2 4 4 53%	5374
	11th to 20th	Night	8% 8% 2 5% 4 3 3 3 4 5% 55%	5317
	21st to end	Night	9% 9% 2 6% 4 5% 6% 4 6% 8% 39%	4984
April	1st to 10th	Night	11% 7% 2 6% 4 4 4 3 6% 6% 46%	2000
	11th to 20th	Night	11% 7% 2 6% 3 4 4 4 5% 6% 49%	1977
	21st to end	Night	14% 7% 3 7% 4 3 5% 3 5% 7% 41%	1897
May	1st to 10th	Night	11% 7% 2 7% 4 4 4 3 6% 7% 46%	4080
	11th to 20th	Night	9% 5% 2 4 3 3 4 3 6% 8% 53%	3776
	21st to end	Night	17% 6% 2 6% 3 4 4 4 6% 6% 43%	3972
June	1st to 10th	Night	8% 3 2 4 4 4 4 4 8% 9% 49%	1600
	11th to 20th	Night	7% 4 1 5% 4 4 5% 4 8% 10% 49%	1600
	21st to end	Night	5% 4 2 6% 4 4 4 4 7% 9% 50%	1600
July	1st to 10th	Night	4 3 1 5% 5% 5% 5% 5% 6% 9% 52%	3640
	11th to 20th	Night	5% 3 1 4 3 4 5% 5% 8% 11% 50%	3640
	21st to end	Night	4 4 2 6% 5% 5% 6% 4 7% 9% 48%	3970
August	1st to 10th	Night	9% 4 2 6% 5% 5% 6% 6% 8% 8% 41%	3722
	11th to 20th	Night	4 3 2 5% 4 5% 5% 4 7% 9% 51%	4478
	21st to end	Night	6% 6% 2 7% 5% 5% 5% 5% 7% 8% 45%	4993
September	1st to 10th	Night	7% 4 2 4 3 3 3 3 5% 8% 59%	2000
	11th to 20th	Night	7% 4 1 4 4 4 4 3 5% 7% 58%	2110
	21st to end	Night	8% 4 1 4 4 3 3 3 4 5% 61%	2200
October	1st to 10th	Night	7% 3 1 2 1 2 2 2 2 3 76%	3597
	11th to 20th	Night	9% 4 1 2 2 3 2 3 4 7% 63%	3778
	21st to end	Night	8% 5% 1 4 3 3 4 3 5% 7% 58%	4455
November	1st to 10th	Night	5% 4 2 6% 3 3 4 4 5% 8% 57%	2535
	11th to 20th	Night	6% 5% 2 4 3 3 4 3 5% 7% 59%	2600
	21st to end	Night	5% 7% 2 4 3 2 3 4 5% 6% 57%	2650
December	1st to 10th	Night	3 5% 2 4 3 3 3 3 4 6% 65%	4570
	11th to 20th	Night	2 4 2 5% 4 4 5% 3 6% 9% 55%	5181
	21st to end	Night	7% 11% 3 7% 4 4 4 4 6% 7% 44%	6974

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% 3 11% 32% 17% 1	3639
	11th to 20th	Day	39% 4 14% 22% 19% 2	3640
	21st to end	Day	25% 3 17% 29% 23% 4	4157
February	1st to 10th	Day	38% 5% 15% 23% 14% 4	1850
	11th to 20th	Day	36% 4 11% 26% 18% 4	1959
	21st to end	Day	30% 5% 12% 28% 18% 6%	1650
March	1st to 10th	Day	32% 3 6% 25% 29% 4	4500
	11th to 20th	Day	27% 3 12% 25% 30% 3	4643
	21st to end	Day	35% 6% 16% 29% 14% 1	5969
April	1st to 10th	Day	32% 5% 14% 28% 16% 4	2400
	11th to 20th	Day	38% 6% 12% 22% 17% 4	2374
	21st to end	Day	37% 6% 13% 26% 17% 2	2501
May	1st to 10th	Day	30% 6% 13% 29% 17% 4	5900
	11th to 20th	Day	32% 5% 13% 26% 21% 2	6140
	21st to end	Day	35% 5% 14% 28% 15% 2	6926
June	1st to 10th	Day	25% 8% 18% 29% 16% 4	2800
	11th to 20th	Day	26% 6% 12% 28% 21% 7%	2800
	21st to end	Day	19% 6% 11% 29% 27% 9%	2800
July	1st to 10th	Day	25% 3 8% 27% 29% 9%	6271
	11th to 20th	Day	23% 2 13% 32% 21% 9%	6265
	21st to end	Day	26% 3 13% 22% 22% 14%	6705
August	1st to 10th	Day	29% 5% 14% 28% 19% 5%	4424
	11th to 20th	Day	25% 6% 12% 23% 26% 8%	3882
	21st to end	Day	23% 3 12% 22% 23% 17%	4311
September	1st to 10th	Day	21% 3 9% 26% 28% 13%	2400
	11th to 20th	Day	22% 4 8% 24% 30% 13%	2290
	21st to end	Day	21% 4 8% 25% 34% 8%	2200
October	1st to 10th	Day	17% 3 5% 20% 33% 22%	3430
	11th to 20th	Day	25% 3 9% 35% 23% 6%	3129
	21st to end	Day	31% 2 11% 28% 23% 5%	3091
November	1st to 10th	Day	24% 5% 13% 29% 22% 8%	1763
	11th to 20th	Day	22% 4 11% 31% 27% 5%	1800
	21st to end	Day	26% 3 12% 29% 24% 5%	1745
December	1st to 10th	Day	21% 3 12% 34% 27% 3	2620
	11th to 20th	Day	19% 2 14% 42% 20% 3	3024
	21st to end	Day	36% 3 10% 35% 14% 2	4004
January	1st to 10th	Night	37% 3 13% 29% 15% 2	6327
	11th to 20th	Night	34% 4 17% 22% 22% 2	6340
	21st to end	Night	30% 5% 14% 29% 20% 3	6864
February	1st to 10th	Night	39% 5% 14% 25% 15% 2	2548
	11th to 20th	Night	38% 5% 14% 25% 15% 3	2338
	21st to end	Night	31% 5% 10% 29% 20% 5%	1980
March	1st to 10th	Night	34% 3 6% 23% 28% 5%	5374
	11th to 20th	Night	32% 3 9% 22% 31% 4	5317
	21st to end	Night	41% 6% 20% 21% 11% 1	4984
April	1st to 10th	Night	36% 6% 14% 21% 18% 4	2000
	11th to 20th	Night	36% 5% 12% 27% 16% 3	1977
	21st to end	Night	40% 7% 12% 25% 15% 1	1897
May	1st to 10th	Night	35% 7% 14% 25% 16% 2	4080
	11th to 20th	Night	28% 6% 16% 32% 14% 4	3777
	21st to end	Night	41% 7% 14% 27% 10% 2	3972
June	1st to 10th	Night	29% 7% 23% 26% 12% 3	1600
	11th to 20th	Night	29% 8% 17% 25% 15% 6%	1600
	21st to end	Night	29% 6% 14% 26% 19% 6%	1600
July	1st to 10th	Night	29% 3 11% 27% 27% 4	3600
	11th to 20th	Night	27% 4 20% 28% 16% 5%	3592
	21st to end	Night	33% 4 14% 21% 18% 9%	3856
August	1st to 10th	Night	38% 4 17% 23% 15% 3	2709
	11th to 20th	Night	32% 5% 16% 23% 18% 6%	3238
	21st to end	Night	27% 4 17% 19% 22% 12%	3597
September	1st to 10th	Night	23% 4 10% 26% 27% 10%	2000
	11th to 20th	Night	26% 5% 10% 26% 22% 12%	2110
	21st to end	Night	25% 4 7% 27% 25% 12%	2200
October	1st to 10th	Night	17% 2 6% 19% 32% 24%	3597
	11th to 20th	Night	23% 3 12% 32% 24% 6%	3778
	21st to end	Night	27% 3 10% 29% 23% 8%	4455
November	1st to 10th	Night	26% 5% 13% 28% 22% 7%	2535
	11th to 20th	Night	24% 4 12% 29% 23% 7%	2600
	21st to end	Night	27% 4 10% 30% 23% 6%	2650
December	1st to 10th	Night	22% 3 13% 36% 23% 3	4570
	11th to 20th	Night	26% 3 11% 41% 17% 2	5182
	21st to end	Night	39% 3 10% 32% 14% 1	6974

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	10% 7% 34% 32% 16% 2	300
	11th to 20th	Day	11% 14% 33% 33% 9%	300
	21st to end	Day	7% 12% 45% 26% 7% 3	330
February	1st to 10th	Day	9% 12% 51% 21% 6%	300
	11th to 20th	Day	9% 12% 46% 24% 8% 2	300
	21st to end	Day	13% 17% 38% 24% 8% 1	249
March	1st to 10th	Day	11% 13% 34% 28% 12% 2	300
	11th to 20th	Day	10% 10% 33% 28% 15% 3	316
	21st to end	Day	15% 15% 35% 22% 10% 2	550
April	1st to 10th	Day	16% 16% 34% 24% 7% 2	500
	11th to 20th	Day	18% 17% 30% 24% 9% 2	492
	21st to end	Day	16% 12% 30% 27% 13% 2	601
May	1st to 10th	Day	16% 11% 26% 27% 14% 5%	703
	11th to 20th	Day	18% 8% 24% 30% 18% 3	725
	21st to end	Day	14% 8% 29% 28% 18% 3	789
June	1st to 10th	Day	8% 4 23% 32% 24% 8%	730
	11th to 20th	Day	9% 5% 32% 31% 20% 3	730
	21st to end	Day	5% 4 28% 35% 23% 5%	730
July	1st to 10th	Day	7% 3 17% 36% 30% 6%	721
	11th to 20th	Day	5% 2 15% 40% 31% 7%	718
	21st to end	Day	5% 2 18% 35% 33% 7%	794
August	1st to 10th	Day	6% 1 17% 39% 32% 5%	726
	11th to 20th	Day	4 4 21% 36% 25% 10%	517
	21st to end	Day	5% 3 22% 35% 25% 10%	583
September	1st to 10th	Day	6% 3 22% 35% 23% 10%	530
	11th to 20th	Day	7% 3 18% 33% 27% 11%	420
	21st to end	Day	9% 7% 22% 27% 22% 14%	330
October	1st to 10th	Day	12% 5% 27% 19% 23% 13%	309
	11th to 20th	Day	7% 11% 32% 25% 17% 8%	300
	21st to end	Day	10% 12% 32% 28% 13% 4	330
November	1st to 10th	Day	10% 10% 30% 30% 15% 5%	300
	11th to 20th	Day	6% 12% 39% 26% 15% 2	300
	21st to end	Day	11% 6% 34% 33% 13% 3	300
December	1st to 10th	Day	9% 12% 37% 31% 10% 1	300
	11th to 20th	Day	9% 10% 43% 29% 9%	300
	21st to end	Day	13% 12% 38% 29% 7% 1	330
January	1st to 10th	Night	7% 11% 38% 35% 8% 1	1000
	11th to 20th	Night	6% 13% 42% 32% 6%	1000
	21st to end	Night	8% 10% 44% 33% 5%	1055
February	1st to 10th	Night	9% 9% 49% 29% 4	800
	11th to 20th	Night	10% 10% 46% 29% 6%	784
	21st to end	Night	8% 10% 47% 32% 3	660
March	1st to 10th	Night	11% 8% 41% 35% 5%	800
	11th to 20th	Night	11% 7% 40% 34% 7%	773
	21st to end	Night	12% 10% 39% 34% 5%	660
April	1st to 10th	Night	14% 12% 38% 33% 4	600
	11th to 20th	Night	14% 11% 39% 33% 3	593
	21st to end	Night	18% 11% 31% 33% 6% 1	600
May	1st to 10th	Night	15% 8% 34% 33% 10%	600
	11th to 20th	Night	17% 5% 29% 39% 10%	591
	21st to end	Night	16% 7% 32% 34% 11%	650
June	1st to 10th	Night	9% 5% 30% 40% 14% 1	600
	11th to 20th	Night	9% 6% 36% 42% 7%	600
	21st to end	Night	8% 4 31% 48% 10%	600
July	1st to 10th	Night	8% 2 25% 45% 20% 1	585
	11th to 20th	Night	5% 2 26% 52% 15%	582
	21st to end	Night	4 2 22% 51% 19%	657
August	1st to 10th	Night	7% 3 22% 49% 19% 1	597
	11th to 20th	Night	5% 2 27% 51% 14% 1	594
	21st to end	Night	5% 3 24% 53% 16%	660
September	1st to 10th	Night	8% 3 25% 50% 13% 1	600
	11th to 20th	Night	9% 3 28% 43% 17% 1	600
	21st to end	Night	10% 4 27% 45% 14%	600
October	1st to 10th	Night	15% 5% 28% 36% 16% 1	624
	11th to 20th	Night	10% 6% 33% 38% 12%	760
	21st to end	Night	11% 8% 34% 37% 9% 1	1033
November	1st to 10th	Night	8% 5% 37% 41% 8% 1	975
	11th to 20th	Night	9% 10% 40% 35% 6% 1	1000
	21st to end	Night	8% 8% 37% 38% 9% 1	1000
December	1st to 10th	Night	8% 9% 47% 31% 6% 1	1000
	11th to 20th	Night	7% 9% 44% 35% 6%	1000
	21st to end	Night	12% 11% 40% 32% 4	1100

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