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 2024-04-25.

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	7% 5% 2 4 4 3 4 4 5% 8% 54%	83272
	Night	7% 6% 2 5% 4 3 4 4 5% 7% 52%	85928
Transparency	Day	28% 6% 13% 28% 20% 5%	82976
	Night	30% 6% 14% 27% 18% 4	85746
Seeing	Day	10% 8% 28% 30% 19% 5%	14937
	Night	9% 8% 36% 38% 9%	25093

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	2 6% 4 7% 5% 3 3 4 4 6% 55%	2538
	11th to 20th	Day	4 8% 4 7% 6% 3 5% 5% 7% 7% 44%	2540
	21st to end	Day	3 5% 2 3 3 2 3 3 5% 8% 62%	2891
February	1st to 10th	Day	4 9% 5% 7% 5% 3 4 6% 5% 6% 44%	1757
	11th to 20th	Day	5% 8% 3 6% 5% 3 4 4 5% 8% 48%	1849
	21st to end	Day	5% 8% 3 4 5% 3 5% 4 5% 6% 53%	1570
March	1st to 10th	Day	7% 8% 2 4 3 2 4 3 5% 7% 53%	3130
	11th to 20th	Day	9% 6% 2 3 3 2 3 3 4 5% 60%	3246
	21st to end	Day	8% 7% 3 6% 5% 3 4 5% 7% 8% 44%	4165
April	1st to 10th	Day	10% 6% 2 4 4 2 4 4 5% 8% 49%	2280
	11th to 20th	Day	14% 7% 2 5% 5% 3 4 5% 6% 8% 42%	2251
	21st to end	Day	11% 6% 3 5% 5% 3 5% 5% 6% 7% 45%	2300
May	1st to 10th	Day	13% 6% 2 4 5% 3 4 6% 6% 9% 43%	2340
	11th to 20th	Day	15% 6% 2 5% 5% 2 5% 4 5% 8% 42%	2407
	21st to end	Day	10% 5% 2 5% 4 3 5% 5% 7% 10% 44%	2724
June	1st to 10th	Day	6% 3 1 3 4 2 4 4 6% 10% 55%	2520
	11th to 20th	Day	7% 3 2 4 3 3 5% 4 6% 9% 54%	2520
	21st to end	Day	3 2 1 3 3 2 5% 5% 6% 9% 60%	2520
July	1st to 10th	Day	7% 3 2 3 3 2 4 6% 7% 8% 55%	2520
	11th to 20th	Day	4 2 1 3 3 2 4 4 6% 10% 61%	2520
	21st to end	Day	3 3 2 4 4 3 4 5% 7% 10% 54%	2742
August	1st to 10th	Day	4 3 1 3 6% 4 5% 6% 7% 11% 50%	2450
	11th to 20th	Day	4 2 1 3 3 2 5% 5% 7% 9% 60%	2123
	21st to end	Day	5% 2 1 3 3 3 3 5% 5% 8% 62%	2376
September	1st to 10th	Day	6% 3 1 4 3 3 3 3 4 6% 63%	2160
	11th to 20th	Day	7% 2 2 2 3 2 4 3 4 6% 65%	2062
	21st to end	Day	8% 4 1 2 3 2 2 3 4 6% 64%	1980
October	1st to 10th	Day	12% 4 1 4 3 2 3 3 5% 6% 57%	1936
	11th to 20th	Day	8% 4 1 3 3 2 3 3 4 6% 63%	1792
	21st to end	Day	8% 5% 2 3 3 2 3 3 4 6% 60%	1782
November	1st to 10th	Day	4 5% 2 3 4 1 3 4 6% 7% 59%	1673
	11th to 20th	Day	5% 5% 2 3 3 2 3 4 6% 7% 60%	1710
	21st to end	Day	5% 7% 2 4 3 2 3 3 4 7% 60%	1658
December	1st to 10th	Day	5% 6% 3 5% 6% 2 4 4 5% 8% 52%	1520
	11th to 20th	Day	4 4 2 4 3 2 4 4 5% 9% 59%	1926
	21st to end	Day	8% 11% 3 5% 4 2 4 4 5% 5% 48%	2794
January	1st to 10th	Night	3 8% 4 7% 5% 2 3 4 5% 6% 53%	4417
	11th to 20th	Night	2 6% 4 6% 5% 3 5% 5% 6% 9% 50%	4430
	21st to end	Night	3 5% 2 4 5% 3 5% 5% 5% 7% 55%	4805
February	1st to 10th	Night	4 10% 4 8% 5% 3 5% 4 5% 6% 46%	2421
	11th to 20th	Night	4 8% 3 7% 6% 3 4 4 6% 8% 46%	2218
	21st to end	Night	4 8% 3 6% 4 3 3 4 5% 6% 52%	1884
March	1st to 10th	Night	7% 12% 3 5% 4 2 3 3 5% 5% 51%	3734
	11th to 20th	Night	9% 8% 2 4 4 2 4 3 4 6% 54%	3718
	21st to end	Night	8% 8% 3 5% 5% 3 5% 5% 6% 9% 44%	3477
April	1st to 10th	Night	11% 7% 3 6% 4 3 4 4 6% 7% 46%	1900
	11th to 20th	Night	11% 7% 2 5% 4 3 4 5% 4 6% 48%	1877
	21st to end	Night	13% 6% 3 6% 5% 2 5% 5% 5% 8% 42%	1757
May	1st to 10th	Night	13% 7% 2 5% 4 3 5% 4 7% 7% 44%	1620
	11th to 20th	Night	16% 6% 2 4 4 2 5% 5% 4 7% 44%	1485
	21st to end	Night	14% 5% 3 5% 3 3 5% 5% 7% 8% 42%	1552
June	1st to 10th	Night	9% 3 2 4 4 3 4 5% 8% 10% 49%	1440
	11th to 20th	Night	7% 4 2 4 4 2 5% 5% 7% 10% 51%	1440
	21st to end	Night	5% 4 2 4 5% 4 4 5% 7% 10% 51%	1440
July	1st to 10th	Night	6% 4 2 5% 4 3 5% 5% 7% 8% 50%	1440
	11th to 20th	Night	4 2 2 3 3 3 5% 6% 7% 9% 58%	1440
	21st to end	Night	4 3 1 4 4 3 7% 6% 7% 10% 51%	1576
August	1st to 10th	Night	6% 3 2 4 5% 2 5% 7% 8% 9% 49%	1486
	11th to 20th	Night	4 3 1 2 4 3 4 4 6% 9% 60%	1773
	21st to end	Night	5% 2 1 4 5% 2 4 5% 5% 7% 60%	1980
September	1st to 10th	Night	7% 4 2 4 3 2 3 4 5% 8% 58%	1800
	11th to 20th	Night	6% 4 2 4 4 3 4 3 5% 7% 59%	1898
	21st to end	Night	8% 3 2 3 4 2 3 3 4 6% 61%	1980
October	1st to 10th	Night	13% 4 2 3 3 2 3 3 3 6% 57%	2022
	11th to 20th	Night	8% 5% 1 3 3 3 3 4 4 5% 62%	2160
	21st to end	Night	8% 6% 2 3 4 2 3 4 5% 6% 58%	2562
November	1st to 10th	Night	5% 4 2 5% 3 2 4 4 5% 8% 59%	2405
	11th to 20th	Night	6% 5% 2 4 3 2 4 3 5% 7% 58%	2470
	21st to end	Night	5% 6% 3 4 4 2 3 4 5% 7% 57%	2517
December	1st to 10th	Night	4 7% 3 6% 4 3 4 3 5% 7% 54%	2660
	11th to 20th	Night	4 5% 2 4 4 2 5% 4 6% 9% 56%	3271
	21st to end	Night	9% 11% 3 5% 4 2 4 4 5% 7% 46%	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	30% 4 12% 32% 21% 1	2539
	11th to 20th	Day	37% 6% 18% 21% 16% 1	2540
	21st to end	Day	21% 4 22% 35% 15% 3	2891
February	1st to 10th	Day	39% 6% 15% 23% 14% 3	1757
	11th to 20th	Day	35% 4 11% 27% 18% 4	1859
	21st to end	Day	31% 5% 13% 28% 17% 6%	1570
March	1st to 10th	Day	29% 5% 9% 27% 26% 4	3130
	11th to 20th	Day	27% 4 17% 33% 17% 3	3246
	21st to end	Day	35% 9% 16% 30% 9% 1	4165
April	1st to 10th	Day	33% 6% 14% 28% 15% 5%	2280
	11th to 20th	Day	39% 6% 13% 22% 16% 4	2254
	21st to end	Day	36% 6% 13% 26% 17% 2	2300
May	1st to 10th	Day	37% 6% 15% 30% 11% 1	2340
	11th to 20th	Day	41% 6% 17% 26% 10% 1	2411
	21st to end	Day	34% 8% 18% 25% 13% 2	2724
June	1st to 10th	Day	24% 8% 18% 30% 15% 5%	2520
	11th to 20th	Day	26% 6% 12% 28% 22% 7%	2520
	21st to end	Day	19% 6% 11% 29% 27% 8%	2520
July	1st to 10th	Day	25% 7% 11% 27% 23% 7%	2451
	11th to 20th	Day	18% 6% 11% 28% 25% 13%	2445
	21st to end	Day	23% 6% 15% 27% 23% 6%	2590
August	1st to 10th	Day	25% 8% 17% 28% 15% 7%	2434
	11th to 20th	Day	20% 6% 13% 28% 24% 9%	2123
	21st to end	Day	20% 5% 10% 25% 27% 14%	2376
September	1st to 10th	Day	23% 4 9% 23% 27% 14%	2160
	11th to 20th	Day	21% 4 8% 23% 30% 14%	2062
	21st to end	Day	22% 4 8% 26% 33% 7%	1980
October	1st to 10th	Day	29% 5% 9% 24% 25% 7%	1936
	11th to 20th	Day	25% 4 8% 29% 25% 8%	1792
	21st to end	Day	26% 4 12% 30% 21% 7%	1782
November	1st to 10th	Day	23% 5% 13% 28% 22% 8%	1673
	11th to 20th	Day	22% 4 12% 31% 26% 5%	1710
	21st to end	Day	26% 3 12% 29% 24% 5%	1658
December	1st to 10th	Day	30% 5% 14% 28% 19% 3	1520
	11th to 20th	Day	24% 4 15% 36% 20% 2	1924
	21st to end	Day	38% 5% 11% 31% 13% 2	2794
January	1st to 10th	Night	32% 5% 13% 34% 15% 1	4417
	11th to 20th	Night	29% 6% 21% 23% 18% 3	4430
	21st to end	Night	28% 7% 18% 32% 14% 1	4805
February	1st to 10th	Night	38% 5% 14% 25% 14% 2	2421
	11th to 20th	Night	35% 6% 14% 27% 15% 3	2218
	21st to end	Night	32% 5% 11% 28% 19% 5%	1884
March	1st to 10th	Night	34% 5% 9% 21% 27% 4	3734
	11th to 20th	Night	32% 5% 12% 28% 21% 2	3718
	21st to end	Night	35% 8% 23% 24% 8% 1	3477
April	1st to 10th	Night	37% 7% 14% 20% 18% 4	1900
	11th to 20th	Night	36% 6% 13% 27% 15% 3	1877
	21st to end	Night	39% 8% 12% 25% 15% 1	1757
May	1st to 10th	Night	37% 9% 16% 25% 13% 1	1620
	11th to 20th	Night	39% 7% 17% 27% 9% 1	1486
	21st to end	Night	38% 10% 18% 20% 10% 3	1552
June	1st to 10th	Night	29% 8% 23% 26% 12% 3	1440
	11th to 20th	Night	26% 9% 18% 25% 15% 6%	1440
	21st to end	Night	27% 7% 15% 27% 20% 5%	1440
July	1st to 10th	Night	30% 7% 14% 28% 18% 4	1400
	11th to 20th	Night	22% 7% 11% 26% 23% 11%	1392
	21st to end	Night	25% 8% 16% 29% 16% 5%	1488
August	1st to 10th	Night	28% 7% 22% 26% 13% 4	1478
	11th to 20th	Night	21% 6% 16% 26% 22% 9%	1773
	21st to end	Night	22% 6% 12% 23% 26% 10%	1980
September	1st to 10th	Night	24% 4 10% 24% 26% 11%	1800
	11th to 20th	Night	24% 5% 9% 25% 23% 13%	1898
	21st to end	Night	25% 4 7% 27% 26% 10%	1980
October	1st to 10th	Night	30% 4 11% 24% 25% 6%	2022
	11th to 20th	Night	26% 4 9% 29% 23% 10%	2160
	21st to end	Night	27% 5% 12% 25% 22% 8%	2562
November	1st to 10th	Night	24% 5% 13% 28% 23% 7%	2405
	11th to 20th	Night	25% 5% 12% 30% 22% 7%	2470
	21st to end	Night	27% 4 10% 29% 23% 6%	2517
December	1st to 10th	Night	30% 5% 14% 29% 18% 4	2660
	11th to 20th	Night	24% 5% 14% 37% 17% 2	3272
	21st to end	Night	37% 5% 12% 31% 13% 2	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% 7% 35% 30% 16% 2	270
	11th to 20th	Day	10% 14% 32% 35% 9%	270
	21st to end	Day	7% 11% 47% 24% 7% 3	297
February	1st to 10th	Day	9% 12% 51% 20% 7%	270
	11th to 20th	Day	9% 13% 46% 22% 9% 2	270
	21st to end	Day	13% 16% 38% 24% 8%	225
March	1st to 10th	Day	10% 13% 34% 28% 13% 2	270
	11th to 20th	Day	9% 9% 33% 29% 15% 4	285
	21st to end	Day	15% 14% 36% 23% 10% 2	506
April	1st to 10th	Day	16% 16% 34% 25% 7% 2	460
	11th to 20th	Day	19% 16% 30% 24% 9% 2	452
	21st to end	Day	14% 11% 30% 28% 14% 2	528
May	1st to 10th	Day	17% 9% 26% 28% 15% 5%	603
	11th to 20th	Day	20% 7% 22% 31% 18% 3	625
	21st to end	Day	14% 7% 28% 29% 19% 3	679
June	1st to 10th	Day	7% 4 21% 32% 26% 9%	630
	11th to 20th	Day	9% 5% 31% 33% 20% 3	630
	21st to end	Day	5% 4 27% 34% 24% 6%	630
July	1st to 10th	Day	7% 3 15% 37% 31% 7%	621
	11th to 20th	Day	6% 3 14% 40% 31% 7%	618
	21st to end	Day	5% 2 17% 36% 34% 7%	684
August	1st to 10th	Day	5% 1 15% 39% 34% 5%	626
	11th to 20th	Day	4 4 22% 35% 24% 10%	437
	21st to end	Day	4 3 22% 33% 26% 11%	495
September	1st to 10th	Day	6% 3 22% 35% 23% 10%	450
	11th to 20th	Day	7% 3 16% 32% 29% 12%	352
	21st to end	Day	10% 8% 22% 27% 22% 11%	270
October	1st to 10th	Day	14% 6% 27% 17% 23% 14%	270
	11th to 20th	Day	8% 12% 33% 24% 15% 9%	270
	21st to end	Day	10% 12% 33% 29% 13% 4	297
November	1st to 10th	Day	8% 10% 30% 30% 16% 6%	270
	11th to 20th	Day	7% 12% 37% 27% 16% 2	270
	21st to end	Day	13% 5% 35% 32% 12% 3	270
December	1st to 10th	Day	9% 12% 37% 31% 9% 1	270
	11th to 20th	Day	9% 10% 41% 30% 10%	270
	21st to end	Day	13% 11% 39% 28% 6% 1	297
January	1st to 10th	Night	7% 11% 38% 35% 9% 1	950
	11th to 20th	Night	6% 13% 41% 33% 6%	950
	21st to end	Night	8% 10% 44% 32% 6%	1003
February	1st to 10th	Night	9% 9% 48% 30% 4	760
	11th to 20th	Night	8% 10% 47% 29% 6%	744
	21st to end	Night	8% 10% 46% 32% 4	628
March	1st to 10th	Night	10% 8% 43% 34% 5%	760
	11th to 20th	Night	11% 7% 40% 34% 8%	735
	21st to end	Night	12% 10% 40% 34% 5%	627
April	1st to 10th	Night	15% 11% 38% 32% 4	570
	11th to 20th	Night	15% 11% 38% 33% 3	563
	21st to end	Night	17% 11% 31% 34% 7% 1	555
May	1st to 10th	Night	15% 8% 34% 34% 9%	540
	11th to 20th	Night	18% 5% 26% 40% 10%	531
	21st to end	Night	16% 7% 31% 34% 12% 1	584
June	1st to 10th	Night	9% 5% 31% 38% 15% 1	540
	11th to 20th	Night	9% 6% 36% 42% 7%	540
	21st to end	Night	7% 3 31% 49% 10%	540
July	1st to 10th	Night	8% 2 25% 44% 21% 1	525
	11th to 20th	Night	5% 2 25% 53% 16%	522
	21st to end	Night	3 2 22% 52% 20% 1	591
August	1st to 10th	Night	6% 2 21% 50% 20% 1	537
	11th to 20th	Night	5% 2 26% 52% 14% 1	534
	21st to end	Night	5% 3 23% 52% 17%	594
September	1st to 10th	Night	9% 4 27% 47% 13% 1	540
	11th to 20th	Night	8% 3 28% 43% 17% 1	540
	21st to end	Night	10% 4 28% 44% 14%	540
October	1st to 10th	Night	16% 5% 28% 35% 15% 1	582
	11th to 20th	Night	10% 7% 34% 37% 12%	720
	21st to end	Night	11% 8% 34% 37% 10% 1	978
November	1st to 10th	Night	7% 6% 36% 42% 9% 1	925
	11th to 20th	Night	9% 10% 40% 35% 6% 1	950
	21st to end	Night	9% 8% 37% 37% 9% 1	950
December	1st to 10th	Night	8% 9% 47% 30% 5% 1	950
	11th to 20th	Night	7% 8% 43% 35% 6%	950
	21st to end	Night	12% 12% 39% 32% 5%	1045

Page generated at 2024-04-22 07:25:39. Version ac07

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