Beatrice High School
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Beatrice High School clear sky chart from 2005-11-06 to 2025-03-27.

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	10% 7% 3 7% 4 4 4 3 5% 7% 46%	108906
	Night	9% 6% 2 6% 4 3 4 3 5% 7% 50%	110633
Transparency	Day	36% 6% 13% 26% 18% 3	112608
	Night	33% 5% 12% 27% 20% 3	115058
Seeing	Day	14% 9% 31% 29% 14% 3	16175
	Night	13% 9% 34% 34% 10% 1	26241

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% 11% 5% 13% 7% 5% 5% 3 4 6% 31%	4077
	11th to 20th	Day	6% 9% 3 9% 6% 6% 6% 4 5% 5% 41%	4080
	21st to end	Day	5% 11% 5% 11% 5% 4 3 3 5% 5% 42%	4488
February	1st to 10th	Day	9% 12% 4 7% 6% 5% 3 4 6% 7% 36%	1800
	11th to 20th	Day	7% 11% 3 8% 4 4 5% 4 5% 8% 41%	1845
	21st to end	Day	7% 7% 3 6% 5% 4 4 3 6% 7% 47%	1650
March	1st to 10th	Day	11% 8% 3 5% 3 3 3 3 4 5% 52%	3473
	11th to 20th	Day	11% 7% 2 5% 3 3 3 3 5% 5% 52%	3590
	21st to end	Day	16% 10% 3 8% 5% 4 4 4 4 7% 35%	3880
April	1st to 10th	Day	13% 7% 3 5% 4 3 3 3 4 6% 48%	2109
	11th to 20th	Day	12% 9% 3 7% 4 4 4 4 4 7% 42%	2385
	21st to end	Day	20% 7% 2 6% 3 3 4 3 5% 7% 39%	2470
May	1st to 10th	Day	14% 9% 3 6% 5% 4 4 3 6% 7% 40%	4082
	11th to 20th	Day	14% 7% 3 7% 4 4 4 3 5% 6% 43%	4082
	21st to end	Day	13% 7% 3 6% 4 4 5% 4 6% 7% 42%	4477
June	1st to 10th	Day	6% 4 1 5% 4 4 4 4 6% 9% 51%	2470
	11th to 20th	Day	8% 5% 1 5% 4 4 5% 4 7% 9% 48%	2470
	21st to end	Day	6% 5% 2 6% 4 4 5% 4 6% 9% 49%	2470
July	1st to 10th	Day	11% 6% 2 6% 4 4 5% 4 6% 7% 46%	4120
	11th to 20th	Day	6% 4 2 5% 4 4 5% 4 6% 9% 51%	4120
	21st to end	Day	4 4 2 5% 4 4 5% 4 7% 9% 53%	4465
August	1st to 10th	Day	6% 4 2 6% 5% 5% 5% 4 6% 10% 47%	4104
	11th to 20th	Day	12% 6% 2 6% 4 3 4 4 6% 8% 45%	4041
	21st to end	Day	5% 4 1 6% 4 4 4 4 6% 9% 54%	4478
September	1st to 10th	Day	13% 4 1 5% 3 3 3 2 5% 7% 55%	2148
	11th to 20th	Day	9% 5% 2 4 4 3 3 2 5% 7% 54%	2090
	21st to end	Day	10% 5% 2 4 3 3 3 2 4 6% 58%	2090
October	1st to 10th	Day	14% 5% 2 5% 3 3 4 3 4 5% 53%	1976
	11th to 20th	Day	10% 5% 2 4 3 3 3 2 4 5% 59%	1900
	21st to end	Day	12% 7% 2 6% 3 3 3 3 4 6% 51%	2090
November	1st to 10th	Day	9% 6% 2 5% 3 4 3 3 4 6% 55%	1777
	11th to 20th	Day	8% 7% 3 5% 3 3 4 3 4 6% 53%	1800
	21st to end	Day	13% 8% 2 6% 3 3 3 3 6% 7% 46%	1685
December	1st to 10th	Day	5% 5% 2 5% 4 4 5% 3 6% 7% 55%	2610
	11th to 20th	Day	7% 9% 3 8% 5% 4 4 3 4 6% 47%	3026
	21st to end	Day	17% 10% 5% 13% 4 4 4 3 4 5% 32%	4488
January	1st to 10th	Night	9% 10% 4 16% 6% 4 5% 3 5% 6% 32%	5888
	11th to 20th	Night	6% 6% 2 7% 5% 5% 7% 4 6% 6% 46%	5900
	21st to end	Night	10% 10% 5% 9% 4 3 3 2 4 5% 44%	6490
February	1st to 10th	Night	10% 11% 3 7% 4 5% 6% 4 6% 5% 39%	2600
	11th to 20th	Night	8% 9% 2 8% 5% 4 5% 4 5% 7% 43%	2459
	21st to end	Night	9% 8% 2 6% 3 4 4 3 4 5% 52%	1980
March	1st to 10th	Night	10% 6% 2 5% 3 3 4 3 4 6% 55%	3601
	11th to 20th	Night	10% 6% 2 4 3 2 3 2 4 6% 58%	3590
	21st to end	Night	17% 8% 3 6% 4 3 4 3 6% 7% 39%	3889
April	1st to 10th	Night	11% 6% 2 5% 4 4 3 3 4 8% 49%	2071
	11th to 20th	Night	10% 8% 3 6% 4 3 3 3 6% 7% 46%	1742
	21st to end	Night	16% 6% 2 5% 5% 3 3 3 6% 7% 45%	1710
May	1st to 10th	Night	18% 7% 2 5% 4 4 3 3 5% 5% 45%	2823
	11th to 20th	Night	13% 5% 2 5% 3 4 4 3 4 8% 49%	2823
	21st to end	Night	13% 5% 2 6% 4 3 4 3 6% 7% 47%	3090
June	1st to 10th	Night	5% 3 2 4 4 4 3 4 7% 9% 55%	1710
	11th to 20th	Night	7% 4 1 4 3 4 4 4 6% 10% 53%	1689
	21st to end	Night	4 3 1 4 4 3 3 4 5% 9% 60%	1710
July	1st to 10th	Night	9% 6% 2 5% 3 4 4 4 6% 8% 49%	2850
	11th to 20th	Night	4 2 1 4 3 3 4 3 6% 8% 61%	2850
	21st to end	Night	3 2 1 4 3 3 4 4 6% 9% 61%	3098
August	1st to 10th	Night	2 3 1 4 4 4 5% 4 6% 10% 56%	2836
	11th to 20th	Night	12% 5% 2 5% 3 4 4 4 5% 9% 48%	2798
	21st to end	Night	6% 3 1 4 3 3 3 3 5% 8% 59%	3187
September	1st to 10th	Night	8% 4 2 3 3 3 2 3 4 7% 62%	2028
	11th to 20th	Night	8% 4 1 3 2 3 4 3 5% 7% 59%	2090
	21st to end	Night	8% 4 1 4 3 3 3 3 4 5% 61%	2090
October	1st to 10th	Night	11% 6% 2 4 3 3 4 3 5% 6% 53%	2184
	11th to 20th	Night	11% 6% 1 4 3 2 3 2 4 4 59%	2280
	21st to end	Night	12% 7% 2 4 3 2 3 3 4 5% 55%	2508
November	1st to 10th	Night	8% 4 2 5% 3 4 3 3 5% 7% 59%	2519
	11th to 20th	Night	8% 6% 2 5% 4 3 4 4 4 6% 55%	2600
	21st to end	Night	10% 7% 3 5% 3 3 2 3 4 6% 54%	2709
December	1st to 10th	Night	5% 4 1 4 4 4 4 3 5% 6% 60%	4580
	11th to 20th	Night	9% 7% 3 7% 4 3 3 3 5% 7% 49%	5171
	21st to end	Night	15% 13% 5% 9% 4 3 4 3 4 5% 36%	6490

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	54% 5% 10% 20% 10% 1	4078
	11th to 20th	Day	44% 4 13% 20% 17% 2	4080
	21st to end	Day	44% 4 12% 21% 18% 1	4488
February	1st to 10th	Day	45% 6% 16% 21% 9% 3	1800
	11th to 20th	Day	41% 6% 12% 23% 15% 3	1854
	21st to end	Day	36% 5% 11% 26% 18% 3	1650
March	1st to 10th	Day	35% 4 9% 26% 22% 4	3473
	11th to 20th	Day	33% 6% 10% 28% 21% 2	3590
	21st to end	Day	48% 8% 20% 18% 6% 1	3880
April	1st to 10th	Day	38% 5% 13% 24% 17% 2	2109
	11th to 20th	Day	41% 6% 12% 23% 15% 3	2385
	21st to end	Day	44% 6% 11% 25% 13% 1	2470
May	1st to 10th	Day	41% 8% 11% 24% 13% 4	4120
	11th to 20th	Day	41% 6% 11% 24% 18%	4086
	21st to end	Day	39% 7% 12% 27% 13% 1	4489
June	1st to 10th	Day	27% 8% 15% 34% 13% 2	2470
	11th to 20th	Day	31% 7% 14% 29% 18% 2	2470
	21st to end	Day	30% 8% 14% 29% 15% 5%	2470
July	1st to 10th	Day	35% 6% 14% 26% 17% 2	4056
	11th to 20th	Day	28% 6% 12% 32% 18% 3	4051
	21st to end	Day	24% 7% 14% 27% 23% 4	4325
August	1st to 10th	Day	31% 7% 16% 26% 16% 4	4090
	11th to 20th	Day	37% 6% 17% 23% 17% 1	4080
	21st to end	Day	27% 5% 16% 27% 18% 7%	4477
September	1st to 10th	Day	30% 4 12% 27% 21% 5%	2148
	11th to 20th	Day	29% 5% 11% 28% 24% 2	2090
	21st to end	Day	28% 4 8% 33% 24% 2	2090
October	1st to 10th	Day	22% 4 7% 18% 47% 3	3288
	11th to 20th	Day	19% 3 10% 28% 30% 9%	3140
	21st to end	Day	31% 3 11% 28% 24% 3	3428
November	1st to 10th	Day	30% 4 13% 28% 21% 3	1777
	11th to 20th	Day	33% 4 10% 28% 24% 2	1800
	21st to end	Day	38% 4 11% 28% 16% 2	1685
December	1st to 10th	Day	29% 4 14% 33% 19% 1	2610
	11th to 20th	Day	38% 4 16% 31% 10% 1	3023
	21st to end	Day	56% 4 9% 22% 8% 1	4488
January	1st to 10th	Night	52% 4 10% 20% 12% 1	5888
	11th to 20th	Night	36% 5% 12% 25% 19% 3	5900
	21st to end	Night	43% 4 11% 19% 19% 4	6490
February	1st to 10th	Night	44% 6% 12% 20% 15% 3	2600
	11th to 20th	Night	39% 5% 13% 24% 15% 3	2460
	21st to end	Night	34% 5% 10% 23% 21% 7%	1980
March	1st to 10th	Night	30% 5% 9% 27% 25% 3	3601
	11th to 20th	Night	29% 4 9% 28% 25% 5%	3590
	21st to end	Night	44% 8% 20% 22% 6% 1	3889
April	1st to 10th	Night	34% 6% 9% 28% 19% 4	2071
	11th to 20th	Night	36% 6% 11% 28% 17% 3	1742
	21st to end	Night	39% 5% 12% 26% 17% 1	1710
May	1st to 10th	Night	40% 6% 11% 23% 18% 3	2850
	11th to 20th	Night	33% 7% 11% 28% 20% 1	2824
	21st to end	Night	34% 8% 16% 21% 20% 1	3099
June	1st to 10th	Night	24% 8% 15% 32% 18% 3	1710
	11th to 20th	Night	24% 7% 16% 31% 18% 5%	1689
	21st to end	Night	21% 5% 16% 33% 21% 4	1710
July	1st to 10th	Night	32% 6% 14% 25% 19% 4	2805
	11th to 20th	Night	20% 6% 13% 32% 25% 4	2796
	21st to end	Night	18% 5% 18% 30% 27% 2	2999
August	1st to 10th	Night	22% 6% 17% 27% 23% 5%	2826
	11th to 20th	Night	34% 5% 14% 28% 16% 2	2825
	21st to end	Night	23% 5% 16% 30% 18% 9%	3187
September	1st to 10th	Night	23% 4 13% 28% 24% 8%	2028
	11th to 20th	Night	24% 5% 11% 32% 24% 4	2090
	21st to end	Night	25% 4 7% 28% 31% 3	2090
October	1st to 10th	Night	20% 4 8% 17% 45% 7%	3639
	11th to 20th	Night	20% 3 7% 33% 26% 11%	3779
	21st to end	Night	29% 3 8% 31% 27% 2	4120
November	1st to 10th	Night	26% 4 13% 26% 25% 5%	2519
	11th to 20th	Night	30% 5% 10% 29% 22% 4	2600
	21st to end	Night	33% 4 11% 28% 21% 3	2709
December	1st to 10th	Night	25% 4 14% 37% 18% 1	4580
	11th to 20th	Night	35% 4 14% 32% 15% 1	5173
	21st to end	Night	51% 5% 10% 25% 9% 1	6490

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	18% 14% 36% 23% 6% 2	300
	11th to 20th	Day	20% 16% 36% 22% 6%	300
	21st to end	Day	14% 11% 46% 22% 7%	330
February	1st to 10th	Day	14% 21% 45% 18% 2	300
	11th to 20th	Day	16% 14% 43% 19% 7%	300
	21st to end	Day	11% 18% 47% 20% 3	249
March	1st to 10th	Day	17% 15% 42% 22% 4 1	300
	11th to 20th	Day	26% 13% 31% 22% 6% 2	300
	21st to end	Day	30% 15% 39% 12% 3 1	315
April	1st to 10th	Day	22% 17% 38% 20% 3	289
	11th to 20th	Day	17% 15% 40% 21% 6% 1	583
	21st to end	Day	22% 17% 30% 19% 9% 2	650
May	1st to 10th	Day	18% 11% 36% 24% 9% 1	653
	11th to 20th	Day	18% 8% 33% 27% 11% 3	675
	21st to end	Day	19% 7% 31% 30% 12% 2	734
June	1st to 10th	Day	5% 5% 23% 37% 24% 6%	680
	11th to 20th	Day	8% 4 35% 32% 18% 3	680
	21st to end	Day	8% 7% 36% 33% 15% 2	680
July	1st to 10th	Day	10% 3 18% 36% 26% 7%	671
	11th to 20th	Day	8% 2 18% 42% 23% 7%	668
	21st to end	Day	7% 1 16% 41% 30% 6%	739
August	1st to 10th	Day	8% 3 19% 42% 26% 3	676
	11th to 20th	Day	10% 4 18% 43% 22% 3	665
	21st to end	Day	9% 3 19% 38% 24% 7%	720
September	1st to 10th	Day	14% 2 23% 38% 19% 4	358
	11th to 20th	Day	8% 2 27% 35% 22% 5%	300
	21st to end	Day	15% 8% 31% 29% 14% 3	300
October	1st to 10th	Day	21% 7% 25% 26% 16% 5%	300
	11th to 20th	Day	7% 17% 43% 24% 8% 1	300
	21st to end	Day	18% 17% 35% 20% 8% 2	330
November	1st to 10th	Day	15% 14% 39% 21% 9% 1	300
	11th to 20th	Day	16% 15% 39% 21% 7% 1	300
	21st to end	Day	21% 12% 34% 23% 9%	300
December	1st to 10th	Day	8% 12% 43% 28% 7% 1	300
	11th to 20th	Day	16% 13% 38% 24% 8%	300
	21st to end	Day	20% 15% 41% 21% 3 1	330
January	1st to 10th	Night	12% 11% 36% 34% 6% 1	1000
	11th to 20th	Night	13% 12% 38% 30% 7%	1000
	21st to end	Night	15% 7% 44% 28% 5%	1100
February	1st to 10th	Night	16% 11% 41% 28% 4	1000
	11th to 20th	Night	14% 14% 40% 28% 4	905
	21st to end	Night	13% 15% 43% 24% 5%	660
March	1st to 10th	Night	13% 14% 40% 27% 6%	650
	11th to 20th	Night	19% 12% 35% 28% 6%	600
	21st to end	Night	21% 12% 41% 21% 5%	647
April	1st to 10th	Night	15% 12% 44% 23% 5%	570
	11th to 20th	Night	16% 12% 40% 27% 5% 1	563
	21st to end	Night	18% 9% 37% 28% 7% 1	570
May	1st to 10th	Night	18% 8% 35% 30% 9%	570
	11th to 20th	Night	16% 8% 33% 34% 9% 1	561
	21st to end	Night	14% 7% 31% 33% 14% 1	617
June	1st to 10th	Night	6% 4 27% 41% 20% 1	570
	11th to 20th	Night	9% 4 32% 41% 14%	570
	21st to end	Night	5% 3 36% 45% 11%	570
July	1st to 10th	Night	9% 2 17% 44% 27% 1	555
	11th to 20th	Night	3 1 19% 51% 24% 1	552
	21st to end	Night	4 1 17% 50% 28% 1	624
August	1st to 10th	Night	3 2 19% 49% 25% 2	567
	11th to 20th	Night	7% 2 20% 49% 20% 2	564
	21st to end	Night	7% 2 21% 43% 24% 3	627
September	1st to 10th	Night	10% 3 27% 41% 17% 2	570
	11th to 20th	Night	10% 2 27% 42% 17% 1	570
	21st to end	Night	10% 5% 31% 39% 14% 1	570
October	1st to 10th	Night	14% 7% 31% 33% 14% 1	664
	11th to 20th	Night	16% 9% 37% 29% 8%	760
	21st to end	Night	17% 11% 32% 32% 8% 1	836
November	1st to 10th	Night	11% 11% 32% 37% 9%	959
	11th to 20th	Night	12% 11% 41% 30% 6%	1000
	21st to end	Night	16% 10% 35% 29% 9% 1	1000
December	1st to 10th	Night	11% 11% 40% 31% 6%	1000
	11th to 20th	Night	16% 11% 35% 33% 6%	1000
	21st to end	Night	18% 12% 34% 30% 5%	1100

Page generated at 2025-03-24 08:04:26. Version ac07

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