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 2024-02-20.

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 6% 5% 3 4 4 5% 7% 45%	78266
	Night	10% 7% 3 5% 4 2 4 4 5% 7% 49%	80952
Transparency	Day	38% 6% 13% 25% 16% 2	77989
	Night	35% 5% 13% 27% 18% 3	80749
Seeing	Day	14% 9% 30% 29% 15% 3	14687
	Night	13% 8% 34% 34% 11% 1	24770

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% 5% 11% 10% 4 5% 5% 4 6% 29%	2847
	11th to 20th	Day	8% 11% 4 9% 6% 3 7% 4 5% 6% 38%	2850
	21st to end	Day	7% 13% 7% 12% 6% 3 3 4 5% 5% 35%	3135
February	1st to 10th	Day	9% 11% 5% 7% 6% 4 4 5% 6% 7% 36%	1710
	11th to 20th	Day	7% 9% 4 7% 5% 3 5% 5% 6% 9% 42%	1740
	21st to end	Day	8% 8% 4 5% 6% 3 4 5% 6% 7% 43%	1480
March	1st to 10th	Day	9% 8% 4 5% 4 3 4 5% 4 6% 48%	1932
	11th to 20th	Day	16% 9% 4 5% 4 3 3 3 5% 5% 43%	1980
	21st to end	Day	15% 12% 4 7% 6% 4 5% 5% 5% 5% 33%	2178
April	1st to 10th	Day	14% 7% 3 4 5% 2 4 4 4 6% 48%	1998
	11th to 20th	Day	12% 8% 3 6% 5% 3 4 5% 5% 7% 42%	2258
	21st to end	Day	20% 6% 2 5% 4 2 5% 3 4 7% 39%	2340
May	1st to 10th	Day	14% 9% 4 6% 6% 3 4 5% 5% 6% 39%	2340
	11th to 20th	Day	14% 7% 3 5% 4 3 4 4 5% 8% 42%	2302
	21st to end	Day	13% 8% 4 6% 6% 4 5% 5% 5% 8% 36%	2531
June	1st to 10th	Day	6% 4 2 4 5% 3 5% 5% 6% 9% 51%	2340
	11th to 20th	Day	8% 4 2 5% 4 3 6% 5% 6% 10% 49%	2340
	21st to end	Day	6% 4 2 5% 5% 3 5% 6% 6% 9% 49%	2340
July	1st to 10th	Day	8% 4 2 4 4 3 5% 6% 6% 9% 50%	2340
	11th to 20th	Day	5% 4 2 4 4 2 5% 5% 6% 9% 56%	2340
	21st to end	Day	6% 4 2 5% 5% 4 5% 5% 7% 10% 47%	2546
August	1st to 10th	Day	6% 4 2 5% 6% 3 6% 6% 7% 11% 43%	2328
	11th to 20th	Day	7% 4 2 5% 4 3 4 5% 6% 9% 51%	2301
	21st to end	Day	7% 4 2 4 5% 3 4 4 4 8% 56%	2548
September	1st to 10th	Day	13% 4 2 4 3 2 3 3 5% 6% 54%	2035
	11th to 20th	Day	10% 5% 2 4 4 3 4 3 5% 7% 53%	1980
	21st to end	Day	10% 4 2 3 4 2 4 3 4 6% 58%	1980
October	1st to 10th	Day	15% 6% 2 4 3 3 4 4 4 5% 51%	1872
	11th to 20th	Day	11% 5% 3 4 4 3 3 3 4 5% 57%	1800
	21st to end	Day	12% 8% 2 5% 4 2 3 3 4 5% 51%	1980
November	1st to 10th	Day	8% 5% 2 4 3 2 4 3 4 7% 57%	1687
	11th to 20th	Day	8% 7% 3 5% 4 2 4 3 5% 6% 54%	1710
	21st to end	Day	13% 7% 3 6% 4 2 3 3 5% 7% 46%	1601
December	1st to 10th	Day	8% 6% 3 5% 5% 3 5% 5% 6% 8% 47%	1520
	11th to 20th	Day	9% 9% 4 7% 5% 3 4 4 5% 6% 43%	1922
	21st to end	Day	15% 11% 5% 13% 7% 3 5% 4 4 6% 28%	3135
January	1st to 10th	Night	8% 10% 5% 12% 8% 3 5% 4 4 5% 36%	4108
	11th to 20th	Night	8% 8% 3 6% 6% 3 8% 5% 5% 5% 44%	4120
	21st to end	Night	12% 11% 6% 9% 4 2 3 4 4 6% 38%	4532
February	1st to 10th	Night	10% 10% 4 6% 5% 3 6% 5% 6% 6% 39%	2470
	11th to 20th	Night	8% 7% 3 6% 6% 2 5% 5% 6% 8% 44%	2327
	21st to end	Night	10% 7% 3 6% 5% 3 4 4 4 6% 49%	1776
March	1st to 10th	Night	9% 6% 4 5% 4 2 5% 4 5% 6% 50%	2026
	11th to 20th	Night	15% 9% 3 4 4 2 3 3 5% 6% 45%	1980
	21st to end	Night	16% 9% 4 7% 6% 3 4 4 5% 6% 35%	2178
April	1st to 10th	Night	11% 6% 3 4 4 3 4 4 5% 8% 49%	1962
	11th to 20th	Night	11% 7% 3 5% 5% 3 3 4 6% 7% 46%	1650
	21st to end	Night	16% 5% 2 5% 5% 2 4 3 6% 8% 45%	1620
May	1st to 10th	Night	14% 7% 3 5% 6% 3 4 4 6% 8% 40%	1620
	11th to 20th	Night	13% 6% 3 5% 4 3 3 4 4 8% 46%	1593
	21st to end	Night	12% 5% 2 6% 5% 2 5% 5% 5% 8% 45%	1745
June	1st to 10th	Night	5% 3 1 4 4 2 4 5% 6% 10% 56%	1620
	11th to 20th	Night	7% 3 1 3 4 3 4 5% 7% 9% 55%	1599
	21st to end	Night	4 2 2 3 4 3 3 4 5% 9% 61%	1620
July	1st to 10th	Night	7% 3 2 4 3 3 4 5% 7% 10% 52%	1620
	11th to 20th	Night	2 2 2 4 5% 2 4 5% 6% 9% 60%	1620
	21st to end	Night	3 2 1 4 4 3 4 5% 6% 10% 56%	1772
August	1st to 10th	Night	3 3 2 4 4 3 4 6% 7% 10% 53%	1611
	11th to 20th	Night	6% 3 1 3 4 2 4 5% 5% 10% 57%	1600
	21st to end	Night	6% 3 2 3 3 2 3 4 5% 6% 62%	1808
September	1st to 10th	Night	8% 4 2 3 3 2 3 3 4 7% 61%	1921
	11th to 20th	Night	9% 4 2 3 3 2 3 5% 5% 7% 58%	1980
	21st to end	Night	8% 4 1 3 3 3 3 4 4 6% 61%	1980
October	1st to 10th	Night	12% 6% 2 4 3 2 4 4 5% 7% 52%	2069
	11th to 20th	Night	12% 6% 1 3 4 2 3 3 4 5% 58%	2160
	21st to end	Night	12% 7% 2 4 4 2 2 3 4 5% 54%	2376
November	1st to 10th	Night	6% 3 2 4 4 3 4 3 4 7% 61%	2389
	11th to 20th	Night	8% 5% 3 5% 4 2 4 4 4 6% 55%	2470
	21st to end	Night	11% 7% 3 4 4 2 3 3 4 6% 54%	2573
December	1st to 10th	Night	8% 5% 2 5% 5% 3 5% 4 4 7% 51%	2660
	11th to 20th	Night	9% 8% 4 6% 3 2 3 3 4 7% 51%	3265
	21st to end	Night	17% 13% 5% 9% 5% 2 3 3 3 5% 35%	4532

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	56% 6% 12% 18% 8% 1	2848
	11th to 20th	Day	47% 6% 16% 19% 11% 1	2850
	21st to end	Day	51% 5% 13% 19% 12% 1	3135
February	1st to 10th	Day	45% 6% 16% 21% 9% 3	1710
	11th to 20th	Day	39% 6% 12% 25% 14% 3	1749
	21st to end	Day	40% 6% 12% 25% 15% 2	1480
March	1st to 10th	Day	38% 5% 12% 26% 16% 3	1932
	11th to 20th	Day	45% 5% 9% 24% 15% 2	1980
	21st to end	Day	52% 7% 13% 18% 8% 1	2178
April	1st to 10th	Day	38% 5% 14% 25% 17% 2	1998
	11th to 20th	Day	41% 6% 12% 24% 14% 2	2258
	21st to end	Day	45% 6% 11% 25% 13% 1	2340
May	1st to 10th	Day	45% 8% 11% 20% 14% 2	2340
	11th to 20th	Day	40% 7% 14% 27% 12%	2306
	21st to end	Day	46% 8% 14% 20% 10% 2	2531
June	1st to 10th	Day	28% 8% 15% 35% 13% 2	2340
	11th to 20th	Day	31% 7% 14% 28% 19% 2	2340
	21st to end	Day	30% 8% 14% 28% 14% 5%	2340
July	1st to 10th	Day	28% 8% 15% 29% 17% 3	2276
	11th to 20th	Day	25% 7% 13% 29% 21% 5%	2271
	21st to end	Day	29% 8% 16% 30% 17% 1	2405
August	1st to 10th	Day	33% 10% 20% 24% 12% 2	2314
	11th to 20th	Day	28% 7% 14% 30% 20% 1	2301
	21st to end	Day	27% 5% 12% 27% 22% 6%	2548
September	1st to 10th	Day	31% 5% 13% 27% 20% 5%	2035
	11th to 20th	Day	30% 5% 11% 29% 23% 2	1980
	21st to end	Day	29% 5% 8% 33% 24% 2	1980
October	1st to 10th	Day	35% 6% 10% 23% 25% 1	1872
	11th to 20th	Day	30% 4 8% 27% 24% 6%	1800
	21st to end	Day	36% 3 12% 23% 20% 5%	1980
November	1st to 10th	Day	28% 4 14% 29% 22% 3	1687
	11th to 20th	Day	32% 4 11% 28% 22% 2	1710
	21st to end	Day	38% 5% 10% 28% 17% 2	1601
December	1st to 10th	Day	35% 6% 14% 29% 15% 1	1520
	11th to 20th	Day	42% 5% 14% 29% 10%	1919
	21st to end	Day	59% 5% 9% 18% 8% 1	3135
January	1st to 10th	Night	49% 5% 13% 21% 12% 1	4108
	11th to 20th	Night	40% 6% 13% 26% 15%	4120
	21st to end	Night	47% 5% 14% 19% 14% 1	4532
February	1st to 10th	Night	44% 6% 12% 20% 14% 4	2470
	11th to 20th	Night	38% 5% 13% 25% 15% 3	2328
	21st to end	Night	36% 5% 11% 23% 19% 6%	1776
March	1st to 10th	Night	35% 5% 12% 28% 18% 4	2026
	11th to 20th	Night	41% 4 10% 24% 17% 3	1980
	21st to end	Night	48% 6% 14% 20% 10% 2	2178
April	1st to 10th	Night	34% 5% 10% 28% 19% 3	1962
	11th to 20th	Night	37% 5% 11% 29% 16% 3	1650
	21st to end	Night	39% 5% 12% 25% 18% 1	1620
May	1st to 10th	Night	42% 7% 14% 23% 13% 2	1620
	11th to 20th	Night	37% 6% 14% 27% 16% 1	1594
	21st to end	Night	37% 8% 19% 23% 13% 2	1746
June	1st to 10th	Night	22% 8% 16% 33% 18% 2	1620
	11th to 20th	Night	24% 7% 16% 31% 18% 5%	1599
	21st to end	Night	20% 5% 16% 34% 21% 4	1620
July	1st to 10th	Night	25% 8% 16% 29% 18% 4	1575
	11th to 20th	Night	19% 7% 15% 28% 25% 6%	1566
	21st to end	Night	21% 6% 18% 35% 19% 2	1673
August	1st to 10th	Night	24% 8% 20% 29% 17% 2	1601
	11th to 20th	Night	24% 6% 15% 33% 20% 3	1600
	21st to end	Night	23% 6% 12% 28% 22% 9%	1808
September	1st to 10th	Night	24% 4 13% 28% 22% 8%	1921
	11th to 20th	Night	25% 6% 10% 32% 23% 4	1980
	21st to end	Night	24% 5% 8% 29% 31% 3	1980
October	1st to 10th	Night	32% 6% 11% 24% 24% 3	2069
	11th to 20th	Night	30% 4 7% 27% 24% 8%	2160
	21st to end	Night	32% 4 10% 24% 25% 4	2376
November	1st to 10th	Night	24% 5% 13% 27% 26% 6%	2389
	11th to 20th	Night	30% 5% 11% 29% 22% 3	2470
	21st to end	Night	33% 4 11% 28% 22% 3	2573
December	1st to 10th	Night	32% 6% 13% 31% 16% 1	2660
	11th to 20th	Night	34% 4 12% 36% 14% 1	3267
	21st to end	Night	53% 5% 9% 24% 8% 1	4532

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% 37% 21% 7% 3	270
	11th to 20th	Day	22% 14% 35% 22% 7%	270
	21st to end	Day	15% 11% 44% 23% 7%	297
February	1st to 10th	Day	13% 20% 45% 19% 2	270
	11th to 20th	Day	13% 13% 45% 20% 7% 1	267
	21st to end	Day	12% 19% 45% 19% 4 1	198
March	1st to 10th	Day	16% 15% 43% 21% 5% 1	240
	11th to 20th	Day	29% 11% 32% 20% 7% 1	240
	21st to end	Day	30% 16% 39% 11% 4 1	264
April	1st to 10th	Day	21% 17% 39% 19% 3	258
	11th to 20th	Day	17% 15% 40% 21% 6% 1	536
	21st to end	Day	22% 18% 30% 19% 10% 2	600
May	1st to 10th	Day	18% 11% 35% 24% 10% 1	603
	11th to 20th	Day	18% 8% 34% 26% 11% 3	625
	21st to end	Day	19% 6% 29% 30% 13% 2	679
June	1st to 10th	Day	5% 5% 22% 37% 24% 6%	630
	11th to 20th	Day	7% 4 33% 33% 19% 4	630
	21st to end	Day	8% 6% 35% 34% 16% 2	630
July	1st to 10th	Day	9% 2 17% 37% 27% 8%	621
	11th to 20th	Day	9% 2 19% 41% 23% 7%	618
	21st to end	Day	7% 1 15% 42% 30% 5%	684
August	1st to 10th	Day	8% 2 17% 42% 26% 4	626
	11th to 20th	Day	9% 4 18% 43% 24% 3	615
	21st to end	Day	9% 3 19% 38% 24% 7%	667
September	1st to 10th	Day	15% 2 22% 37% 19% 4	325
	11th to 20th	Day	9% 2 29% 33% 22% 6%	270
	21st to end	Day	16% 8% 33% 29% 13% 3	270
October	1st to 10th	Day	23% 8% 26% 23% 15% 6%	270
	11th to 20th	Day	8% 17% 43% 23% 7% 1	270
	21st to end	Day	18% 16% 35% 20% 8% 2	297
November	1st to 10th	Day	14% 14% 38% 23% 10% 1	270
	11th to 20th	Day	14% 15% 42% 21% 8% 1	270
	21st to end	Day	23% 10% 33% 24% 8%	270
December	1st to 10th	Day	9% 12% 42% 28% 7% 1	270
	11th to 20th	Day	17% 12% 37% 26% 9%	270
	21st to end	Day	19% 15% 43% 21% 2	297
January	1st to 10th	Night	12% 11% 36% 34% 6% 1	950
	11th to 20th	Night	14% 12% 37% 30% 7%	950
	21st to end	Night	16% 7% 43% 28% 5%	1045
February	1st to 10th	Night	16% 10% 41% 29% 4	950
	11th to 20th	Night	13% 13% 40% 29% 5%	857
	21st to end	Night	14% 15% 42% 23% 6%	592
March	1st to 10th	Night	13% 15% 39% 26% 6% 1	586
	11th to 20th	Night	20% 11% 34% 29% 6%	540
	21st to end	Night	21% 11% 41% 22% 6%	594
April	1st to 10th	Night	15% 12% 44% 23% 5%	540
	11th to 20th	Night	16% 11% 39% 28% 5% 1	533
	21st to end	Night	18% 9% 36% 29% 7% 1	540
May	1st to 10th	Night	17% 8% 35% 30% 9%	540
	11th to 20th	Night	16% 8% 34% 32% 10% 1	531
	21st to end	Night	14% 7% 30% 33% 14% 1	584
June	1st to 10th	Night	6% 3 26% 42% 21% 1	540
	11th to 20th	Night	9% 4 31% 42% 14%	540
	21st to end	Night	5% 3 36% 45% 12%	540
July	1st to 10th	Night	9% 2 16% 44% 28% 1	525
	11th to 20th	Night	3 1 19% 50% 25% 1	522
	21st to end	Night	4 1 16% 51% 28% 1	591
August	1st to 10th	Night	3 2 18% 49% 25% 3	537
	11th to 20th	Night	6% 2 19% 49% 22% 2	534
	21st to end	Night	7% 2 20% 43% 25% 3	594
September	1st to 10th	Night	10% 3 27% 40% 17% 2	540
	11th to 20th	Night	11% 2 27% 42% 18% 1	540
	21st to end	Night	10% 4 32% 38% 14% 1	540
October	1st to 10th	Night	15% 7% 32% 32% 13% 1	629
	11th to 20th	Night	17% 9% 36% 28% 9%	720
	21st to end	Night	17% 10% 31% 33% 8% 1	792
November	1st to 10th	Night	9% 10% 33% 37% 10%	909
	11th to 20th	Night	12% 10% 42% 29% 6%	950
	21st to end	Night	16% 10% 35% 30% 9% 1	950
December	1st to 10th	Night	12% 11% 39% 31% 6%	950
	11th to 20th	Night	16% 10% 34% 34% 6%	950
	21st to end	Night	19% 13% 34% 29% 5%	1045

Page generated at 2024-02-17 05:28:35. Version ac07

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