Kearney
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kearney clear sky chart from 2005-11-06 to 2024-03-23.

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	9% 6% 3 5% 4 3 4 4 5% 7% 50%	78996
	Night	8% 6% 2 5% 4 3 4 4 5% 7% 52%	80927
Transparency	Day	33% 7% 14% 27% 17% 3	78713
	Night	32% 6% 13% 27% 19% 4	80733
Seeing	Day	12% 8% 31% 32% 15% 2	14790
	Night	11% 8% 36% 36% 9% 1	24917

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	7% 13% 5% 7% 5% 2 4 4 4 6% 44%	2538
	11th to 20th	Day	6% 10% 5% 7% 5% 3 5% 5% 6% 7% 41%	2602
	21st to end	Day	6% 8% 4 10% 6% 3 4 2 4 5% 46%	3135
February	1st to 10th	Day	9% 9% 4 7% 7% 3 5% 5% 6% 7% 39%	1743
	11th to 20th	Day	5% 7% 3 6% 5% 3 4 4 5% 7% 50%	1849
	21st to end	Day	8% 8% 2 5% 4 2 4 3 5% 6% 54%	1570
March	1st to 10th	Day	8% 5% 2 4 4 3 3 3 5% 6% 57%	1923
	11th to 20th	Day	13% 7% 3 5% 3 2 3 4 5% 7% 48%	2090
	21st to end	Day	13% 10% 4 6% 4 3 5% 5% 5% 7% 39%	2200
April	1st to 10th	Day	11% 6% 2 5% 4 3 4 4 5% 7% 50%	2096
	11th to 20th	Day	14% 6% 3 5% 4 3 4 4 6% 7% 43%	2221
	21st to end	Day	16% 6% 2 4 4 3 4 4 5% 8% 44%	2340
May	1st to 10th	Day	13% 6% 3 5% 4 2 4 4 6% 7% 44%	2340
	11th to 20th	Day	16% 7% 2 5% 4 3 4 3 5% 7% 44%	2302
	21st to end	Day	13% 6% 2 5% 6% 4 5% 5% 7% 8% 39%	2531
June	1st to 10th	Day	6% 3 1 3 4 2 4 3 7% 9% 56%	2431
	11th to 20th	Day	8% 4 2 4 4 3 4 5% 5% 9% 53%	2520
	21st to end	Day	5% 4 2 4 4 2 4 4 5% 9% 55%	2520
July	1st to 10th	Day	6% 3 2 4 4 3 5% 5% 5% 9% 53%	2520
	11th to 20th	Day	5% 3 2 3 4 2 5% 4 6% 8% 58%	2507
	21st to end	Day	5% 4 2 4 4 3 5% 6% 6% 9% 51%	2546
August	1st to 10th	Day	7% 5% 2 4 5% 4 6% 5% 8% 10% 45%	2328
	11th to 20th	Day	6% 4 2 4 4 3 5% 4 5% 8% 56%	2301
	21st to end	Day	8% 4 2 4 4 2 4 4 5% 7% 57%	2462
September	1st to 10th	Day	11% 5% 2 4 4 3 3 3 5% 6% 55%	2064
	11th to 20th	Day	8% 4 2 4 3 3 3 3 5% 7% 57%	1980
	21st to end	Day	9% 3 1 3 3 2 3 4 3 6% 62%	1980
October	1st to 10th	Day	15% 5% 2 2 3 1 3 3 4 6% 56%	1976
	11th to 20th	Day	10% 5% 2 3 3 2 2 3 4 6% 60%	1800
	21st to end	Day	13% 6% 3 4 4 2 2 2 4 6% 56%	1832
November	1st to 10th	Day	7% 4 2 4 3 3 4 5% 5% 7% 57%	1673
	11th to 20th	Day	6% 5% 2 5% 4 1 4 4 3 5% 60%	1710
	21st to end	Day	9% 6% 3 5% 4 2 3 3 3 7% 53%	1710
December	1st to 10th	Day	6% 6% 2 5% 5% 3 4 3 5% 7% 53%	1710
	11th to 20th	Day	7% 7% 3 5% 5% 3 5% 4 4 6% 51%	2152
	21st to end	Day	11% 12% 4 11% 5% 3 4 4 4 5% 37%	2794
January	1st to 10th	Night	6% 11% 4 9% 7% 2 3 4 5% 6% 42%	4417
	11th to 20th	Night	5% 9% 4 6% 5% 3 4 4 4 6% 51%	4364
	21st to end	Night	6% 10% 4 8% 8% 3 4 4 4 6% 44%	4532
February	1st to 10th	Night	8% 9% 4 6% 5% 3 4 4 5% 6% 44%	2451
	11th to 20th	Night	4 6% 3 7% 5% 3 4 5% 6% 7% 48%	2218
	21st to end	Night	6% 6% 3 5% 4 3 3 4 4 6% 55%	1884
March	1st to 10th	Night	10% 6% 3 4 4 2 3 3 4 6% 55%	2256
	11th to 20th	Night	12% 6% 2 5% 3 2 3 4 4 6% 52%	2090
	21st to end	Night	13% 9% 3 5% 5% 3 5% 5% 5% 8% 41%	2200
April	1st to 10th	Night	10% 7% 2 5% 6% 3 4 4 5% 7% 48%	1859
	11th to 20th	Night	13% 5% 2 5% 5% 3 5% 4 5% 8% 45%	1685
	21st to end	Night	13% 5% 2 4 4 2 2 3 5% 8% 51%	1620
May	1st to 10th	Night	14% 6% 2 4 5% 3 4 5% 5% 8% 46%	1620
	11th to 20th	Night	13% 6% 2 5% 4 2 5% 4 6% 8% 46%	1593
	21st to end	Night	14% 5% 2 5% 5% 3 4 4 6% 10% 42%	1745
June	1st to 10th	Night	4 2 2 4 4 3 5% 4 7% 11% 54%	1525
	11th to 20th	Night	9% 4 2 4 4 3 4 4 5% 8% 55%	1440
	21st to end	Night	4 3 1 3 4 2 5% 4 7% 9% 57%	1440
July	1st to 10th	Night	6% 4 1 3 5% 3 6% 6% 6% 10% 50%	1440
	11th to 20th	Night	2 2 1 3 4 3 5% 5% 6% 10% 58%	1448
	21st to end	Night	4 3 2 4 4 3 5% 5% 8% 10% 53%	1772
August	1st to 10th	Night	5% 4 2 5% 5% 4 5% 6% 7% 9% 49%	1611
	11th to 20th	Night	5% 4 2 4 3 3 4 5% 7% 9% 55%	1600
	21st to end	Night	5% 4 1 3 3 2 3 4 4 7% 62%	1891
September	1st to 10th	Night	9% 3 1 3 2 2 3 3 4 6% 64%	1894
	11th to 20th	Night	8% 3 1 4 4 2 3 4 5% 5% 61%	1980
	21st to end	Night	8% 3 1 2 4 2 4 4 5% 6% 62%	1980
October	1st to 10th	Night	16% 4 1 3 3 2 2 3 4 6% 55%	1980
	11th to 20th	Night	9% 5% 2 3 3 2 3 3 4 6% 62%	2146
	21st to end	Night	11% 5% 2 4 3 2 2 3 4 6% 58%	2520
November	1st to 10th	Night	4 4 2 3 3 2 3 3 4 7% 65%	2405
	11th to 20th	Night	7% 5% 1 4 4 2 4 5% 4 6% 58%	2470
	21st to end	Night	8% 5% 2 4 3 2 3 4 5% 8% 57%	2470
December	1st to 10th	Night	5% 6% 3 4 4 3 4 5% 4 7% 55%	2470
	11th to 20th	Night	7% 5% 2 5% 4 2 3 4 5% 8% 54%	3038
	21st to end	Night	13% 12% 3 6% 5% 3 3 3 4 6% 41%	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	39% 7% 15% 26% 12% 1	2539
	11th to 20th	Day	41% 9% 15% 20% 13% 3	2602
	21st to end	Day	40% 6% 15% 24% 14% 1	3135
February	1st to 10th	Day	44% 6% 15% 22% 10% 3	1743
	11th to 20th	Day	33% 7% 17% 24% 15% 4	1859
	21st to end	Day	32% 5% 14% 27% 16% 6%	1570
March	1st to 10th	Day	29% 6% 13% 28% 20% 4	1923
	11th to 20th	Day	36% 5% 13% 26% 17% 3	2090
	21st to end	Day	45% 7% 15% 23% 9% 1	2200
April	1st to 10th	Day	34% 5% 16% 25% 16% 2	2096
	11th to 20th	Day	39% 6% 16% 21% 15% 3	2224
	21st to end	Day	38% 7% 13% 28% 13% 1	2340
May	1st to 10th	Day	38% 8% 15% 23% 14% 2	2340
	11th to 20th	Day	40% 7% 17% 24% 12%	2306
	21st to end	Day	40% 10% 16% 22% 10% 2	2531
June	1st to 10th	Day	23% 8% 19% 33% 14% 2	2431
	11th to 20th	Day	27% 7% 15% 29% 17% 4	2520
	21st to end	Day	24% 7% 16% 30% 18% 4	2520
July	1st to 10th	Day	26% 8% 15% 29% 20% 2	2451
	11th to 20th	Day	23% 8% 14% 30% 22% 4	2432
	21st to end	Day	26% 9% 18% 31% 16%	2405
August	1st to 10th	Day	31% 10% 18% 27% 12% 1	2314
	11th to 20th	Day	25% 7% 15% 35% 17% 1	2301
	21st to end	Day	28% 6% 12% 25% 24% 6%	2462
September	1st to 10th	Day	30% 6% 10% 23% 23% 7%	2064
	11th to 20th	Day	27% 6% 12% 28% 24% 3	1980
	21st to end	Day	25% 4 10% 33% 27% 1	1980
October	1st to 10th	Day	31% 5% 9% 26% 27% 2	1976
	11th to 20th	Day	27% 4 10% 30% 22% 7%	1800
	21st to end	Day	33% 3 12% 25% 22% 5%	1832
November	1st to 10th	Day	26% 6% 13% 30% 21% 4	1673
	11th to 20th	Day	28% 4 10% 27% 25% 5%	1710
	21st to end	Day	33% 4 12% 26% 21% 4	1710
December	1st to 10th	Day	33% 4 14% 30% 17% 2	1710
	11th to 20th	Day	34% 6% 13% 34% 13%	2150
	21st to end	Day	50% 6% 9% 21% 13% 1	2794
January	1st to 10th	Night	42% 6% 12% 25% 14% 1	4417
	11th to 20th	Night	35% 5% 14% 27% 18% 1	4364
	21st to end	Night	41% 7% 13% 22% 16% 1	4532
February	1st to 10th	Night	40% 6% 14% 23% 14% 4	2451
	11th to 20th	Night	34% 7% 13% 28% 16% 3	2218
	21st to end	Night	31% 5% 13% 22% 22% 8%	1884
March	1st to 10th	Night	31% 5% 11% 27% 21% 5%	2256
	11th to 20th	Night	34% 5% 10% 26% 21% 5%	2090
	21st to end	Night	42% 7% 15% 23% 13% 1	2200
April	1st to 10th	Night	35% 6% 14% 23% 19% 2	1859
	11th to 20th	Night	37% 7% 15% 25% 15% 2	1685
	21st to end	Night	33% 7% 14% 27% 18% 2	1620
May	1st to 10th	Night	37% 7% 16% 23% 15% 1	1620
	11th to 20th	Night	35% 8% 18% 25% 13% 1	1594
	21st to end	Night	37% 10% 18% 21% 11% 2	1746
June	1st to 10th	Night	23% 9% 21% 30% 15% 2	1525
	11th to 20th	Night	29% 7% 13% 28% 19% 4	1440
	21st to end	Night	22% 7% 17% 32% 19% 4	1440
July	1st to 10th	Night	27% 8% 18% 28% 16% 4	1400
	11th to 20th	Night	18% 9% 18% 27% 23% 5%	1400
	21st to end	Night	22% 8% 18% 33% 15% 3	1673
August	1st to 10th	Night	28% 10% 19% 27% 13% 2	1601
	11th to 20th	Night	24% 7% 16% 32% 18% 3	1600
	21st to end	Night	22% 6% 13% 24% 26% 8%	1891
September	1st to 10th	Night	22% 4 10% 28% 25% 10%	1894
	11th to 20th	Night	24% 6% 11% 29% 25% 5%	1980
	21st to end	Night	24% 5% 9% 29% 28% 5%	1980
October	1st to 10th	Night	32% 5% 8% 27% 25% 4	1980
	11th to 20th	Night	25% 4 9% 26% 26% 9%	2146
	21st to end	Night	29% 4 11% 25% 23% 8%	2520
November	1st to 10th	Night	20% 5% 12% 31% 26% 7%	2405
	11th to 20th	Night	26% 5% 9% 28% 26% 5%	2470
	21st to end	Night	27% 5% 13% 26% 25% 4	2470
December	1st to 10th	Night	29% 6% 14% 30% 19% 3	2470
	11th to 20th	Night	28% 5% 12% 34% 19% 1	3039
	21st to end	Night	43% 6% 12% 26% 11% 1	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	13% 11% 37% 27% 10% 1	270
	11th to 20th	Day	16% 14% 34% 28% 7%	270
	21st to end	Day	12% 7% 46% 24% 9% 2	297
February	1st to 10th	Day	12% 14% 48% 21% 5%	270
	11th to 20th	Day	10% 11% 46% 25% 7% 1	270
	21st to end	Day	14% 15% 48% 18% 4	225
March	1st to 10th	Day	13% 9% 46% 26% 7%	270
	11th to 20th	Day	20% 8% 35% 26% 10%	270
	21st to end	Day	22% 10% 40% 20% 7%	270
April	1st to 10th	Day	13% 19% 42% 21% 5% 1	356
	11th to 20th	Day	19% 15% 38% 25% 5%	502
	21st to end	Day	20% 14% 33% 21% 11% 2	600
May	1st to 10th	Day	15% 9% 32% 31% 11% 1	603
	11th to 20th	Day	19% 8% 32% 25% 14% 2	625
	21st to end	Day	17% 6% 33% 29% 13% 2	679
June	1st to 10th	Day	5% 6% 26% 35% 21% 7%	630
	11th to 20th	Day	8% 6% 31% 37% 17% 1	630
	21st to end	Day	6% 6% 30% 39% 18% 1	630
July	1st to 10th	Day	7% 3 20% 37% 29% 4	621
	11th to 20th	Day	5% 3 19% 42% 27% 4	618
	21st to end	Day	5% 3 18% 43% 26% 5%	684
August	1st to 10th	Day	8% 3 16% 45% 25% 4	626
	11th to 20th	Day	7% 2 20% 42% 26% 3	615
	21st to end	Day	10% 2 19% 41% 23% 5%	581
September	1st to 10th	Day	10% 4 23% 40% 20% 3	354
	11th to 20th	Day	6% 6% 27% 37% 20% 5%	270
	21st to end	Day	14% 9% 29% 31% 17% 1	270
October	1st to 10th	Day	22% 7% 24% 30% 12% 4	270
	11th to 20th	Day	8% 14% 41% 24% 10% 3	270
	21st to end	Day	21% 11% 34% 26% 7% 1	297
November	1st to 10th	Day	10% 10% 39% 29% 10% 3	270
	11th to 20th	Day	9% 13% 41% 28% 9% 1	270
	21st to end	Day	16% 12% 37% 21% 10% 3	270
December	1st to 10th	Day	9% 8% 45% 27% 10%	270
	11th to 20th	Day	13% 10% 39% 29% 9% 1	270
	21st to end	Day	17% 12% 43% 26% 2 1	297
January	1st to 10th	Night	11% 11% 37% 33% 7% 1	950
	11th to 20th	Night	11% 11% 40% 31% 7% 1	950
	21st to end	Night	10% 9% 43% 30% 8%	1045
February	1st to 10th	Night	13% 9% 45% 28% 5%	931
	11th to 20th	Night	7% 11% 43% 34% 4	744
	21st to end	Night	10% 11% 45% 30% 5%	628
March	1st to 10th	Night	12% 11% 44% 29% 4	736
	11th to 20th	Night	14% 9% 41% 29% 6% 1	570
	21st to end	Night	19% 11% 40% 24% 6%	600
April	1st to 10th	Night	14% 12% 46% 26% 2	540
	11th to 20th	Night	14% 16% 40% 28% 3	533
	21st to end	Night	15% 12% 32% 31% 9%	540
May	1st to 10th	Night	15% 6% 40% 31% 7%	540
	11th to 20th	Night	14% 9% 36% 32% 8% 1	531
	21st to end	Night	15% 8% 33% 32% 11% 1	584
June	1st to 10th	Night	6% 5% 29% 45% 12% 2	540
	11th to 20th	Night	10% 6% 35% 39% 10%	540
	21st to end	Night	6% 3 31% 48% 12%	540
July	1st to 10th	Night	6% 3 24% 42% 24% 1	525
	11th to 20th	Night	2 2 22% 56% 17% 1	522
	21st to end	Night	4 1 20% 51% 23% 1	591
August	1st to 10th	Night	7% 2 17% 54% 19% 2	537
	11th to 20th	Night	7% 3 25% 49% 17%	534
	21st to end	Night	7% 3 21% 47% 21% 2	594
September	1st to 10th	Night	9% 4 26% 49% 11% 1	540
	11th to 20th	Night	8% 3 34% 39% 15% 1	540
	21st to end	Night	8% 8% 33% 39% 11% 1	540
October	1st to 10th	Night	19% 8% 29% 33% 11% 1	540
	11th to 20th	Night	12% 9% 36% 35% 7%	706
	21st to end	Night	14% 11% 32% 31% 11%	936
November	1st to 10th	Night	7% 10% 37% 39% 6%	925
	11th to 20th	Night	9% 11% 39% 34% 7%	950
	21st to end	Night	10% 9% 35% 35% 10% 1	950
December	1st to 10th	Night	9% 11% 41% 35% 4	950
	11th to 20th	Night	12% 10% 38% 32% 8%	950
	21st to end	Night	15% 11% 37% 32% 5%	1045

Page generated at 2024-03-19 22:31:06. Version ac07

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