Kentucky Cutoff Overlook
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kentucky Cutoff Overlook clear sky chart from 2005-11-06 to 2024-10-24.

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	14% 8% 3 7% 5% 5% 5% 4 6% 7% 37%	100832
	Night	14% 9% 3 7% 4 4 4 3 5% 7% 40%	97904
Transparency	Day	44% 7% 11% 22% 14% 2	100644
	Night	42% 6% 11% 22% 15% 3	97761
Seeing	Day	19% 13% 24% 22% 15% 6%	14677
	Night	18% 11% 23% 28% 17% 3	24685

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	15% 14% 7% 11% 5% 4 6% 4 5% 4 26%	2836
	11th to 20th	Day	18% 13% 6% 15% 5% 4 4 2 3 3 28%	2840
	21st to end	Day	22% 15% 7% 6% 4 4 3 2 4 5% 29%	3159
February	1st to 10th	Day	16% 14% 5% 8% 5% 5% 4 3 5% 6% 30%	1900
	11th to 20th	Day	21% 10% 4 8% 5% 4 2 2 4 5% 32%	1848
	21st to end	Day	19% 12% 3 9% 5% 4 3 3 5% 4 32%	1570
March	1st to 10th	Day	21% 13% 4 7% 4 4 4 3 5% 5% 30%	3140
	11th to 20th	Day	14% 8% 3 6% 4 3 4 3 4 5% 46%	3480
	21st to end	Day	15% 10% 3 7% 4 5% 4 3 5% 6% 39%	3815
April	1st to 10th	Day	13% 8% 3 7% 4 4 4 3 7% 7% 40%	2237
	11th to 20th	Day	15% 8% 3 6% 4 4 5% 3 4 6% 41%	2254
	21st to end	Day	14% 8% 3 7% 5% 5% 4 4 6% 7% 37%	2451
May	1st to 10th	Day	20% 7% 3 7% 5% 5% 4 3 6% 7% 32%	4082
	11th to 20th	Day	19% 8% 3 7% 5% 4 5% 4 5% 6% 35%	4081
	21st to end	Day	12% 6% 2 7% 6% 5% 5% 5% 6% 8% 38%	4476
June	1st to 10th	Day	11% 6% 3 7% 6% 5% 5% 5% 7% 9% 37%	2470
	11th to 20th	Day	7% 5% 2 5% 5% 6% 6% 4 8% 10% 42%	2470
	21st to end	Day	7% 5% 2 6% 5% 5% 6% 5% 9% 11% 38%	2470
July	1st to 10th	Day	8% 5% 2 7% 6% 6% 7% 6% 8% 11% 36%	4120
	11th to 20th	Day	10% 6% 2 7% 6% 6% 6% 5% 7% 9% 37%	4120
	21st to end	Day	19% 10% 4 10% 7% 5% 6% 5% 6% 8% 20%	4466
August	1st to 10th	Day	7% 5% 2 6% 5% 5% 5% 5% 8% 10% 42%	4104
	11th to 20th	Day	8% 5% 2 7% 5% 6% 6% 5% 8% 11% 36%	3863
	21st to end	Day	7% 3 2 5% 4 4 6% 4 7% 8% 51%	4180
September	1st to 10th	Day	15% 6% 2 7% 5% 4 5% 4 5% 7% 40%	2156
	11th to 20th	Day	14% 6% 3 6% 5% 5% 4 4 6% 8% 39%	2090
	21st to end	Day	16% 4 2 4 4 4 4 4 5% 7% 45%	2090
October	1st to 10th	Day	11% 5% 2 5% 3 3 3 3 5% 7% 53%	2090
	11th to 20th	Day	13% 5% 2 5% 3 4 4 3 5% 5% 51%	1983
	21st to end	Day	17% 7% 2 4 3 3 3 3 5% 7% 44%	1912
November	1st to 10th	Day	11% 6% 2 5% 3 3 3 3 4 6% 53%	1672
	11th to 20th	Day	15% 9% 2 5% 3 4 4 3 5% 6% 45%	1710
	21st to end	Day	15% 10% 3 6% 4 4 4 3 5% 5% 42%	1710
December	1st to 10th	Day	21% 13% 4 7% 4 3 4 3 4 5% 31%	1710
	11th to 20th	Day	15% 13% 5% 7% 5% 5% 4 4 5% 6% 32%	2153
	21st to end	Day	16% 14% 6% 7% 4 4 4 4 6% 8% 27%	3124
January	1st to 10th	Night	16% 16% 7% 8% 4 3 3 3 4 5% 29%	4109
	11th to 20th	Night	20% 13% 4 8% 6% 5% 3 2 3 4 32%	4120
	21st to end	Night	20% 15% 4 7% 4 3 4 3 3 4 32%	4496
February	1st to 10th	Night	18% 11% 4 9% 5% 4 4 4 5% 6% 30%	2280
	11th to 20th	Night	21% 10% 4 9% 4 4 4 3 4 4 33%	2218
	21st to end	Night	21% 13% 4 8% 5% 4 3 3 4 6% 29%	1884
March	1st to 10th	Night	21% 14% 3 7% 4 4 4 3 4 6% 30%	3711
	11th to 20th	Night	13% 7% 3 5% 4 4 3 4 5% 6% 47%	3480
	21st to end	Night	14% 8% 3 7% 5% 5% 5% 3 5% 5% 39%	3817
April	1st to 10th	Night	12% 8% 2 5% 4 4 4 4 6% 6% 44%	1957
	11th to 20th	Night	15% 7% 3 6% 4 3 3 3 5% 6% 45%	1875
	21st to end	Night	14% 8% 2 7% 4 4 4 4 5% 7% 42%	1727
May	1st to 10th	Night	16% 7% 2 8% 5% 5% 5% 4 6% 7% 35%	2813
	11th to 20th	Night	16% 9% 3 6% 4 5% 4 3 6% 7% 36%	2812
	21st to end	Night	8% 4 2 7% 5% 4 5% 4 6% 9% 45%	3079
June	1st to 10th	Night	9% 6% 2 6% 5% 4 6% 4 7% 9% 42%	1710
	11th to 20th	Night	4 3 2 5% 4 5% 4 4 8% 11% 50%	1710
	21st to end	Night	7% 4 2 6% 5% 5% 6% 5% 7% 11% 43%	1710
July	1st to 10th	Night	7% 4 2 6% 5% 5% 5% 6% 8% 11% 41%	2840
	11th to 20th	Night	9% 4 2 5% 4 4 5% 3 6% 10% 48%	2840
	21st to end	Night	13% 10% 3 10% 7% 7% 6% 5% 6% 9% 25%	3087
August	1st to 10th	Night	7% 4 2 5% 5% 4 5% 4 7% 9% 49%	2825
	11th to 20th	Night	7% 5% 2 6% 5% 4 5% 5% 7% 9% 44%	2962
	21st to end	Night	5% 3 1 3 2 3 4 3 5% 9% 62%	3476
September	1st to 10th	Night	10% 6% 3 6% 5% 4 4 4 6% 6% 47%	2004
	11th to 20th	Night	12% 5% 2 7% 4 4 5% 3 5% 7% 46%	2090
	21st to end	Night	12% 5% 2 5% 4 3 3 3 5% 6% 51%	2090
October	1st to 10th	Night	10% 4 2 4 2 4 3 2 4 6% 59%	2090
	11th to 20th	Night	15% 5% 2 5% 3 4 3 3 4 5% 51%	2195
	21st to end	Night	14% 8% 2 5% 4 2 4 3 4 7% 48%	2507
November	1st to 10th	Night	10% 7% 2 6% 3 4 3 3 4 5% 52%	2406
	11th to 20th	Night	13% 8% 2 5% 4 3 4 3 5% 6% 46%	2470
	21st to end	Night	14% 10% 4 7% 4 3 3 3 3 6% 43%	2470
December	1st to 10th	Night	18% 15% 4 7% 5% 4 4 3 5% 5% 30%	2470
	11th to 20th	Night	16% 12% 6% 10% 4 3 3 3 4 5% 35%	3042
	21st to end	Night	15% 13% 6% 9% 6% 6% 6% 4 5% 6% 23%	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	57% 6% 8% 17% 11% 2	2837
	11th to 20th	Day	62% 4 6% 14% 13% 1	2840
	21st to end	Day	59% 3 8% 20% 11% 1	3159
February	1st to 10th	Day	55% 4 7% 17% 16% 1	1900
	11th to 20th	Day	56% 4 7% 18% 12% 2	1858
	21st to end	Day	54% 4 9% 14% 14% 5%	1570
March	1st to 10th	Day	54% 5% 7% 16% 12% 5%	3140
	11th to 20th	Day	40% 5% 9% 25% 17% 4	3480
	21st to end	Day	45% 6% 9% 26% 13% 1	3815
April	1st to 10th	Day	41% 6% 11% 23% 15% 3	2237
	11th to 20th	Day	43% 5% 7% 20% 22% 3	2254
	21st to end	Day	43% 7% 11% 25% 12% 2	2451
May	1st to 10th	Day	50% 8% 11% 22% 9% 1	4120
	11th to 20th	Day	49% 7% 10% 22% 11%	4085
	21st to end	Day	41% 9% 12% 20% 16% 2	4489
June	1st to 10th	Day	42% 8% 12% 22% 14% 2	2470
	11th to 20th	Day	33% 11% 17% 21% 16% 2	2470
	21st to end	Day	36% 10% 17% 20% 14% 4	2470
July	1st to 10th	Day	37% 11% 21% 20% 9% 1	4055
	11th to 20th	Day	39% 9% 16% 27% 7% 2	4051
	21st to end	Day	60% 8% 11% 14% 6% 1	4324
August	1st to 10th	Day	33% 10% 18% 27% 13%	4091
	11th to 20th	Day	35% 10% 18% 24% 13% 1	3902
	21st to end	Day	28% 8% 14% 37% 12% 2	4179
September	1st to 10th	Day	43% 7% 11% 18% 18% 4	2156
	11th to 20th	Day	42% 7% 10% 21% 18% 2	2090
	21st to end	Day	38% 6% 10% 23% 19% 4	2090
October	1st to 10th	Day	31% 6% 8% 24% 27% 5%	2090
	11th to 20th	Day	34% 4 9% 20% 26% 6%	1983
	21st to end	Day	39% 4 8% 23% 20% 5%	1912
November	1st to 10th	Day	33% 3 9% 24% 26% 4	1672
	11th to 20th	Day	40% 3 8% 22% 22% 5%	1710
	21st to end	Day	44% 4 8% 20% 21% 3	1710
December	1st to 10th	Day	55% 3 8% 20% 12% 2	1710
	11th to 20th	Day	52% 5% 8% 18% 14% 2	2150
	21st to end	Day	53% 5% 12% 20% 9% 2	3124
January	1st to 10th	Night	55% 6% 8% 17% 13% 2	4109
	11th to 20th	Night	57% 3 6% 14% 16% 4	4120
	21st to end	Night	56% 4 8% 15% 15% 1	4496
February	1st to 10th	Night	53% 5% 10% 18% 13% 1	2280
	11th to 20th	Night	55% 3 7% 18% 13% 4	2219
	21st to end	Night	58% 4 7% 14% 15% 3	1884
March	1st to 10th	Night	55% 6% 9% 14% 14% 3	3711
	11th to 20th	Night	37% 5% 9% 28% 13% 9%	3480
	21st to end	Night	45% 5% 11% 24% 14% 1	3817
April	1st to 10th	Night	38% 6% 10% 25% 18% 3	1957
	11th to 20th	Night	39% 4 10% 19% 22% 5%	1875
	21st to end	Night	41% 7% 10% 27% 13% 1	1727
May	1st to 10th	Night	45% 10% 12% 23% 8% 1	2840
	11th to 20th	Night	45% 8% 14% 23% 10%	2813
	21st to end	Night	31% 10% 16% 25% 17% 1	3087
June	1st to 10th	Night	35% 8% 14% 25% 15% 2	1710
	11th to 20th	Night	25% 9% 20% 27% 17% 2	1710
	21st to end	Night	33% 9% 18% 23% 14% 4	1710
July	1st to 10th	Night	32% 12% 21% 24% 10% 1	2795
	11th to 20th	Night	30% 7% 18% 32% 10% 2	2786
	21st to end	Night	54% 9% 13% 16% 7% 1	2988
August	1st to 10th	Night	28% 9% 15% 32% 15% 1	2814
	11th to 20th	Night	32% 8% 19% 28% 12% 1	2989
	21st to end	Night	19% 7% 13% 41% 18% 2	3476
September	1st to 10th	Night	35% 9% 12% 20% 19% 6%	2004
	11th to 20th	Night	37% 7% 9% 24% 20% 2	2090
	21st to end	Night	34% 6% 10% 22% 24% 4	2090
October	1st to 10th	Night	28% 5% 9% 23% 29% 6%	2090
	11th to 20th	Night	35% 4 9% 23% 23% 6%	2195
	21st to end	Night	38% 4 6% 21% 24% 7%	2507
November	1st to 10th	Night	35% 4 7% 23% 25% 7%	2406
	11th to 20th	Night	38% 5% 7% 20% 24% 7%	2470
	21st to end	Night	44% 3 7% 24% 19% 3	2470
December	1st to 10th	Night	56% 4 8% 19% 11% 2	2470
	11th to 20th	Night	52% 3 8% 18% 16% 3	3044
	21st to end	Night	56% 7% 11% 15% 10%	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	28% 26% 31% 11% 2 1	270
	11th to 20th	Day	37% 31% 19% 11% 2	270
	21st to end	Day	26% 30% 33% 9% 1	297
February	1st to 10th	Day	29% 27% 28% 14% 2	270
	11th to 20th	Day	40% 26% 26% 7% 1	270
	21st to end	Day	42% 25% 29% 4 1	225
March	1st to 10th	Day	31% 23% 34% 8% 4	277
	11th to 20th	Day	27% 24% 30% 15% 4 1	460
	21st to end	Day	29% 18% 31% 15% 6% 1	506
April	1st to 10th	Day	27% 19% 25% 18% 10% 1	460
	11th to 20th	Day	22% 19% 29% 19% 10% 2	452
	21st to end	Day	22% 18% 30% 18% 11% 2	460
May	1st to 10th	Day	21% 14% 34% 17% 10% 3	463
	11th to 20th	Day	17% 11% 26% 25% 13% 7%	487
	21st to end	Day	15% 8% 22% 28% 18% 9%	529
June	1st to 10th	Day	12% 9% 20% 30% 19% 10%	490
	11th to 20th	Day	7% 4 20% 32% 26% 11%	490
	21st to end	Day	8% 5% 25% 29% 22% 9%	490
July	1st to 10th	Day	11% 5% 15% 26% 26% 18%	485
	11th to 20th	Day	9% 6% 14% 29% 28% 14%	484
	21st to end	Day	14% 4 14% 30% 26% 12%	532
August	1st to 10th	Day	14% 3 16% 28% 28% 12%	486
	11th to 20th	Day	11% 4 19% 36% 22% 9%	479
	21st to end	Day	12% 4 10% 27% 29% 19%	539
September	1st to 10th	Day	14% 3 14% 27% 28% 13%	490
	11th to 20th	Day	14% 5% 14% 28% 28% 12%	490
	21st to end	Day	18% 6% 20% 28% 19% 9%	490
October	1st to 10th	Day	11% 7% 21% 31% 24% 5%	490
	11th to 20th	Day	16% 15% 25% 26% 14% 4	490
	21st to end	Day	25% 10% 27% 27% 9% 2	409
November	1st to 10th	Day	18% 13% 36% 23% 7% 4	270
	11th to 20th	Day	21% 16% 41% 18% 4	270
	21st to end	Day	20% 20% 36% 15% 10%	270
December	1st to 10th	Day	33% 19% 33% 12% 3	270
	11th to 20th	Day	27% 20% 30% 16% 5% 1	270
	21st to end	Day	31% 22% 32% 11% 3	297
January	1st to 10th	Night	24% 22% 29% 22% 4	760
	11th to 20th	Night	30% 21% 27% 18% 4	760
	21st to end	Night	21% 19% 36% 21% 2	836
February	1st to 10th	Night	26% 16% 33% 23% 3	760
	11th to 20th	Night	28% 18% 35% 17% 1	743
	21st to end	Night	32% 19% 31% 16% 1	628
March	1st to 10th	Night	24% 14% 33% 25% 4	760
	11th to 20th	Night	24% 16% 31% 22% 6% 1	760
	21st to end	Night	22% 15% 31% 25% 8%	836
April	1st to 10th	Night	17% 15% 30% 27% 10%	627
	11th to 20th	Night	18% 13% 33% 24% 12%	563
	21st to end	Night	16% 9% 34% 31% 9% 1	570
May	1st to 10th	Night	15% 8% 29% 30% 16% 3	570
	11th to 20th	Night	13% 7% 22% 33% 20% 4	561
	21st to end	Night	7% 3 22% 33% 29% 6%	617
June	1st to 10th	Night	10% 4 16% 38% 27% 6%	570
	11th to 20th	Night	4 2 15% 42% 30% 7%	570
	21st to end	Night	6% 3 16% 41% 29% 5%	570
July	1st to 10th	Night	10% 2 9% 31% 40% 8%	555
	11th to 20th	Night	8% 2 10% 30% 42% 7%	552
	21st to end	Night	8% 3 8% 35% 39% 7%	624
August	1st to 10th	Night	10% 3 8% 31% 41% 7%	567
	11th to 20th	Night	10% 2 9% 39% 34% 6%	564
	21st to end	Night	9% 2 7% 33% 40% 9%	627
September	1st to 10th	Night	12% 3 9% 28% 41% 7%	674
	11th to 20th	Night	13% 3 12% 31% 35% 6%	760
	21st to end	Night	14% 3 17% 33% 28% 5%	760
October	1st to 10th	Night	13% 5% 17% 32% 27% 7%	760
	11th to 20th	Night	18% 9% 22% 32% 18% 2	760
	21st to end	Night	17% 10% 27% 28% 16% 2	805
November	1st to 10th	Night	13% 10% 23% 35% 17% 3	740
	11th to 20th	Night	17% 14% 29% 28% 10% 1	760
	21st to end	Night	21% 14% 29% 27% 9%	760
December	1st to 10th	Night	27% 17% 26% 25% 6%	760
	11th to 20th	Night	22% 17% 28% 26% 6% 1	760
	21st to end	Night	27% 17% 27% 25% 4	836

Page generated at 2024-10-21 01:20:01. Version ac07

Copyright © 2024 Attilla Danko.