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 2024-11-04.

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	9% 6% 2 5% 4 4 4 3 5% 7% 52%	105184
	Night	8% 6% 2 5% 4 3 3 3 5% 7% 53%	102462
Transparency	Day	32% 6% 13% 27% 19% 3	104940
	Night	30% 6% 13% 26% 20% 4	102296
Seeing	Day	12% 8% 31% 31% 15% 2	15754
	Night	11% 8% 36% 36% 9% 1	25633

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% 8% 4 4 4 3 4 6% 44%	2538
	11th to 20th	Day	6% 10% 4 8% 4 4 5% 4 6% 7% 41%	2602
	21st to end	Day	6% 8% 4 11% 5% 4 3 2 4 5% 46%	3135
February	1st to 10th	Day	8% 11% 3 8% 6% 4 5% 4 6% 7% 39%	1743
	11th to 20th	Day	5% 8% 3 7% 4 4 4 3 6% 7% 49%	1849
	21st to end	Day	8% 8% 2 5% 4 3 3 3 5% 6% 53%	1570
March	1st to 10th	Day	9% 6% 2 4 3 3 3 2 4 5% 57%	3177
	11th to 20th	Day	11% 6% 3 5% 3 3 2 3 4 6% 55%	3480
	21st to end	Day	13% 9% 3 7% 4 4 4 4 6% 7% 40%	3814
April	1st to 10th	Day	10% 6% 2 6% 4 3 4 3 6% 6% 50%	2213
	11th to 20th	Day	13% 7% 2 6% 4 3 4 3 6% 7% 43%	2347
	21st to end	Day	16% 6% 2 5% 4 4 3 3 5% 8% 44%	2470
May	1st to 10th	Day	12% 6% 2 6% 4 3 4 3 6% 7% 46%	4120
	11th to 20th	Day	13% 6% 2 5% 3 4 4 3 5% 7% 48%	4082
	21st to end	Day	14% 6% 2 6% 4 5% 4 3 7% 7% 43%	4489
June	1st to 10th	Day	6% 3 1 4 3 3 3 3 7% 9% 56%	2567
	11th to 20th	Day	8% 5% 2 4 3 4 4 4 5% 9% 52%	2660
	21st to end	Day	5% 4 2 5% 4 3 4 4 6% 9% 55%	2660
July	1st to 10th	Day	10% 4 2 5% 3 4 4 4 5% 7% 52%	4430
	11th to 20th	Day	6% 3 2 5% 3 4 4 3 7% 9% 53%	4404
	21st to end	Day	4 4 2 4 3 4 5% 4 6% 8% 57%	4466
August	1st to 10th	Day	9% 5% 2 5% 4 5% 5% 4 6% 8% 47%	4103
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 3 5% 7% 45%	4041
	21st to end	Day	6% 4 2 5% 3 3 3 2 4 6% 60%	4322
September	1st to 10th	Day	10% 5% 2 5% 3 3 3 2 5% 6% 56%	2178
	11th to 20th	Day	8% 4 2 4 3 3 3 3 5% 7% 57%	2090
	21st to end	Day	9% 3 1 3 2 3 3 3 3 6% 63%	2090
October	1st to 10th	Day	9% 3 1 2 1 2 2 1 3 4 73%	3462
	11th to 20th	Day	6% 4 1 3 2 2 3 3 4 7% 65%	3140
	21st to end	Day	9% 5% 2 4 3 2 3 2 5% 6% 59%	3166
November	1st to 10th	Day	7% 4 2 5% 3 4 3 4 5% 6% 57%	1700
	11th to 20th	Day	6% 6% 2 6% 4 2 3 3 4 5% 59%	1710
	21st to end	Day	9% 7% 3 5% 4 2 3 3 4 6% 53%	1710
December	1st to 10th	Day	6% 7% 2 6% 5% 4 3 3 5% 6% 53%	1710
	11th to 20th	Day	7% 8% 3 6% 5% 4 5% 3 4 6% 50%	2152
	21st to end	Day	11% 13% 4 12% 4 4 4 3 4 5% 37%	2794
January	1st to 10th	Night	6% 11% 3 12% 5% 3 3 3 5% 6% 42%	4417
	11th to 20th	Night	5% 9% 3 7% 4 4 4 3 4 6% 51%	4364
	21st to end	Night	6% 10% 4 9% 6% 4 3 3 4 6% 44%	4532
February	1st to 10th	Night	8% 10% 3 7% 5% 4 4 4 6% 6% 44%	2451
	11th to 20th	Night	4 8% 3 7% 5% 4 4 5% 6% 7% 48%	2218
	21st to end	Night	6% 6% 3 6% 4 3 4 3 5% 6% 55%	1884
March	1st to 10th	Night	11% 5% 2 4 3 2 3 3 4 5% 59%	3684
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 5% 6% 58%	3480
	21st to end	Night	15% 8% 2 5% 4 4 4 4 5% 8% 41%	3817
April	1st to 10th	Night	9% 8% 2 6% 5% 3 4 3 5% 7% 49%	1962
	11th to 20th	Night	13% 5% 2 6% 4 4 4 4 5% 8% 46%	1779
	21st to end	Night	14% 6% 2 5% 3 3 2 3 5% 8% 50%	1710
May	1st to 10th	Night	20% 6% 2 4 3 3 4 3 5% 6% 44%	2850
	11th to 20th	Night	9% 6% 2 6% 3 4 5% 4 6% 9% 47%	2823
	21st to end	Night	14% 5% 2 6% 4 4 4 4 6% 10% 42%	3098
June	1st to 10th	Night	4 3 2 5% 3 5% 4 3 7% 11% 54%	1609
	11th to 20th	Night	9% 4 2 5% 4 3 4 3 5% 8% 54%	1520
	21st to end	Night	4 3 1 4 4 3 5% 3 7% 9% 57%	1520
July	1st to 10th	Night	9% 4 1 4 4 4 4 4 5% 7% 53%	2540
	11th to 20th	Night	6% 2 2 5% 4 4 5% 5% 7% 11% 50%	2561
	21st to end	Night	3 3 1 4 3 3 4 3 6% 8% 64%	3097
August	1st to 10th	Night	5% 3 2 5% 4 5% 5% 4 7% 10% 50%	2836
	11th to 20th	Night	9% 5% 2 5% 4 5% 3 4 7% 8% 48%	2798
	21st to end	Night	4 4 1 4 4 4 4 4 6% 9% 56%	3342
September	1st to 10th	Night	8% 3 1 3 2 3 3 2 4 6% 65%	2000
	11th to 20th	Night	8% 3 1 4 4 3 3 4 5% 5% 61%	2090
	21st to end	Night	8% 3 1 3 3 3 4 3 5% 5% 62%	2090
October	1st to 10th	Night	9% 2 1 2 2 2 2 1 3 4 72%	3480
	11th to 20th	Night	5% 4 1 3 2 2 2 2 3 6% 67%	3765
	21st to end	Night	8% 4 2 4 3 3 2 2 4 7% 60%	4373
November	1st to 10th	Night	5% 4 1 3 2 3 3 3 5% 7% 64%	2451
	11th to 20th	Night	7% 5% 1 5% 4 3 4 4 4 5% 58%	2470
	21st to end	Night	8% 5% 2 4 3 3 3 3 5% 7% 57%	2470
December	1st to 10th	Night	5% 7% 2 5% 4 4 4 4 4 7% 55%	2470
	11th to 20th	Night	7% 5% 2 6% 4 3 3 3 5% 8% 54%	3038
	21st to end	Night	13% 12% 3 7% 4 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% 5% 9% 23% 29% 4	3177
	11th to 20th	Day	30% 5% 13% 28% 21% 2	3480
	21st to end	Day	40% 10% 21% 22% 5% 1	3814
April	1st to 10th	Day	34% 6% 15% 26% 17% 2	2213
	11th to 20th	Day	39% 6% 16% 21% 16% 3	2350
	21st to end	Day	38% 8% 13% 28% 13% 1	2470
May	1st to 10th	Day	33% 9% 14% 23% 15% 5%	4120
	11th to 20th	Day	34% 9% 13% 30% 13% 1	4086
	21st to end	Day	37% 8% 13% 29% 12% 1	4489
June	1st to 10th	Day	23% 8% 18% 33% 14% 2	2567
	11th to 20th	Day	28% 7% 15% 30% 17% 4	2660
	21st to end	Day	24% 7% 16% 30% 19% 4	2660
July	1st to 10th	Day	31% 7% 11% 27% 24% 2	4361
	11th to 20th	Day	26% 7% 16% 30% 18% 2	4329
	21st to end	Day	23% 8% 15% 26% 23% 6%	4325
August	1st to 10th	Day	33% 7% 15% 25% 18% 2	4090
	11th to 20th	Day	38% 7% 14% 24% 17% 1	4080
	21st to end	Day	26% 5% 14% 25% 22% 8%	4321
September	1st to 10th	Day	30% 6% 10% 24% 24% 7%	2178
	11th to 20th	Day	26% 6% 12% 29% 24% 3	2090
	21st to end	Day	24% 4 9% 32% 27% 3	2090
October	1st to 10th	Day	18% 3 5% 22% 41% 10%	3462
	11th to 20th	Day	20% 3 13% 36% 19% 8%	3140
	21st to end	Day	28% 3 9% 30% 26% 4	3166
November	1st to 10th	Day	27% 6% 13% 30% 21% 4	1700
	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	27% 5% 10% 25% 27% 7%	3684
	11th to 20th	Night	27% 5% 9% 29% 26% 4	3480
	21st to end	Night	39% 9% 22% 22% 7% 1	3817
April	1st to 10th	Night	34% 6% 13% 23% 20% 3	1962
	11th to 20th	Night	36% 7% 14% 24% 17% 2	1779
	21st to end	Night	33% 7% 14% 27% 17% 2	1710
May	1st to 10th	Night	38% 8% 13% 24% 15% 3	2850
	11th to 20th	Night	31% 10% 18% 25% 16% 1	2824
	21st to end	Night	35% 12% 17% 24% 11% 2	3099
June	1st to 10th	Night	23% 10% 21% 29% 16% 2	1609
	11th to 20th	Night	30% 7% 12% 29% 18% 4	1520
	21st to end	Night	22% 7% 17% 31% 19% 4	1520
July	1st to 10th	Night	30% 6% 14% 30% 17% 3	2500
	11th to 20th	Night	26% 7% 16% 30% 18% 4	2513
	21st to end	Night	17% 7% 17% 26% 23% 11%	2999
August	1st to 10th	Night	28% 7% 16% 26% 19% 4	2826
	11th to 20th	Night	33% 7% 17% 26% 15% 1	2825
	21st to end	Night	24% 6% 14% 28% 18% 8%	3342
September	1st to 10th	Night	22% 4 10% 28% 26% 10%	2000
	11th to 20th	Night	24% 6% 11% 29% 25% 5%	2090
	21st to end	Night	24% 5% 9% 28% 27% 6%	2090
October	1st to 10th	Night	19% 3 4 18% 46% 9%	3480
	11th to 20th	Night	21% 3 11% 29% 26% 11%	3765
	21st to end	Night	26% 3 10% 27% 28% 5%	4373
November	1st to 10th	Night	20% 5% 12% 31% 26% 7%	2451
	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% 41% 20% 7%	297
April	1st to 10th	Day	14% 19% 41% 20% 5% 1	393
	11th to 20th	Day	18% 16% 37% 24% 5%	548
	21st to end	Day	20% 14% 33% 20% 10% 2	650
May	1st to 10th	Day	15% 10% 34% 30% 11% 1	653
	11th to 20th	Day	18% 8% 32% 27% 14% 2	675
	21st to end	Day	16% 7% 33% 28% 13% 2	734
June	1st to 10th	Day	5% 6% 27% 35% 20% 7%	680
	11th to 20th	Day	9% 7% 31% 36% 16% 1	680
	21st to end	Day	6% 6% 32% 37% 17% 1	680
July	1st to 10th	Day	8% 3 21% 36% 28% 4	671
	11th to 20th	Day	5% 3 19% 43% 26% 4	668
	21st to end	Day	5% 3 18% 42% 26% 5%	739
August	1st to 10th	Day	8% 3 17% 44% 24% 4	676
	11th to 20th	Day	7% 3 21% 41% 25% 3	665
	21st to end	Day	9% 3 21% 41% 22% 5%	629
September	1st to 10th	Day	10% 4 23% 41% 19% 3	388
	11th to 20th	Day	5% 6% 30% 36% 19% 4	300
	21st to end	Day	13% 9% 27% 30% 18% 3	300
October	1st to 10th	Day	20% 7% 25% 31% 13% 5%	300
	11th to 20th	Day	7% 13% 44% 23% 10% 2	300
	21st to end	Day	20% 11% 36% 25% 7% 1	330
November	1st to 10th	Day	11% 9% 39% 28% 10% 3	279
	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%	627
April	1st to 10th	Night	14% 13% 45% 26% 2	570
	11th to 20th	Night	14% 16% 40% 27% 3	563
	21st to end	Night	15% 12% 34% 31% 8%	570
May	1st to 10th	Night	16% 7% 39% 31% 6%	570
	11th to 20th	Night	14% 9% 36% 33% 7% 1	561
	21st to end	Night	16% 7% 35% 31% 11%	617
June	1st to 10th	Night	6% 6% 29% 45% 12% 2	570
	11th to 20th	Night	11% 6% 35% 38% 10%	570
	21st to end	Night	6% 3 33% 46% 12%	570
July	1st to 10th	Night	6% 3 25% 42% 23% 1	555
	11th to 20th	Night	2 2 22% 57% 17% 1	552
	21st to end	Night	4 1 20% 52% 23% 1	624
August	1st to 10th	Night	7% 2 18% 53% 18% 2	567
	11th to 20th	Night	7% 2 25% 49% 16%	564
	21st to end	Night	7% 3 22% 46% 21% 1	627
September	1st to 10th	Night	9% 3 26% 50% 11% 1	570
	11th to 20th	Night	8% 4 34% 40% 14% 1	570
	21st to end	Night	9% 8% 32% 38% 12% 1	570
October	1st to 10th	Night	18% 8% 29% 33% 12% 1	570
	11th to 20th	Night	12% 9% 37% 34% 7%	746
	21st to end	Night	14% 12% 33% 31% 10%	988
November	1st to 10th	Night	7% 10% 37% 39% 6%	943
	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 2024-11-01 21:47:35. Version ac07

Copyright © 2024 Attilla Danko.