Pleasant View (Cheatham)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pleasant View (Cheatham) clear sky chart from 2005-11-06 to 2024-11-05.

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	13% 7% 3 6% 4 4 4 4 5% 7% 41%	101075
	Night	14% 8% 3 6% 4 4 4 3 5% 7% 44%	97949
Transparency	Day	40% 6% 10% 24% 18% 3	104794
	Night	39% 5% 9% 23% 19% 4	102370
Seeing	Day	16% 11% 23% 24% 18% 8%	15251
	Night	17% 8% 24% 30% 18% 3	24977

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	12% 14% 8% 9% 5% 5% 4 3 4 5% 31%	2527
	11th to 20th	Day	20% 10% 3 10% 4 3 4 2 4 4 35%	2530
	21st to end	Day	26% 10% 6% 6% 3 3 3 2 4 5% 32%	3422
February	1st to 10th	Day	18% 12% 3 7% 4 4 4 3 4 6% 36%	1900
	11th to 20th	Day	22% 9% 4 8% 4 3 3 2 4 6% 35%	1848
	21st to end	Day	19% 10% 3 8% 5% 3 4 3 4 5% 36%	1570
March	1st to 10th	Day	22% 13% 3 8% 4 3 3 3 4 4 33%	3120
	11th to 20th	Day	14% 7% 2 5% 4 4 4 3 4 5% 48%	3306
	21st to end	Day	12% 8% 2 7% 5% 4 4 3 6% 6% 42%	4069
April	1st to 10th	Day	13% 7% 2 5% 4 4 4 4 5% 7% 44%	2280
	11th to 20th	Day	15% 7% 3 6% 4 3 4 4 5% 7% 42%	2254
	21st to end	Day	14% 8% 2 6% 5% 4 5% 4 5% 6% 41%	2307
May	1st to 10th	Day	19% 7% 2 6% 4 4 5% 4 7% 8% 35%	4082
	11th to 20th	Day	16% 8% 3 7% 4 4 4 3 5% 8% 37%	4081
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 6% 9% 40%	4476
June	1st to 10th	Day	11% 6% 2 5% 5% 5% 5% 4 7% 8% 43%	2541
	11th to 20th	Day	5% 4 1 6% 5% 5% 6% 5% 8% 10% 46%	2660
	21st to end	Day	5% 3 2 5% 5% 5% 5% 6% 8% 13% 43%	2660
July	1st to 10th	Day	7% 6% 2 7% 5% 5% 6% 5% 7% 12% 38%	4440
	11th to 20th	Day	8% 5% 2 6% 4 5% 6% 5% 8% 11% 39%	4440
	21st to end	Day	16% 10% 3 10% 6% 5% 6% 4 5% 8% 26%	4471
August	1st to 10th	Day	4 3 1 4 4 4 4 5% 7% 9% 53%	3884
	11th to 20th	Day	7% 5% 2 7% 5% 5% 6% 6% 7% 11% 39%	3729
	21st to end	Day	5% 4 2 5% 3 5% 5% 4 6% 9% 54%	4180
September	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	2268
	11th to 20th	Day	14% 5% 2 6% 5% 4 4 3 5% 7% 46%	2090
	21st to end	Day	10% 7% 2 6% 4 3 4 4 4 7% 48%	2090
October	1st to 10th	Day	10% 4 1 4 4 3 3 4 4 6% 57%	2090
	11th to 20th	Day	12% 5% 2 5% 3 3 3 3 4 5% 53%	2021
	21st to end	Day	19% 5% 2 5% 3 4 3 3 4 5% 47%	1907
November	1st to 10th	Day	13% 4 1 4 3 3 2 2 5% 7% 55%	1708
	11th to 20th	Day	14% 7% 2 4 4 3 2 3 4 7% 49%	1710
	21st to end	Day	15% 9% 2 5% 4 4 4 2 5% 5% 45%	1710
December	1st to 10th	Day	22% 11% 2 5% 3 4 4 3 5% 5% 36%	1710
	11th to 20th	Day	16% 11% 3 6% 4 4 5% 4 5% 6% 37%	2153
	21st to end	Day	15% 13% 4 7% 5% 5% 5% 4 6% 7% 30%	2841
January	1st to 10th	Night	18% 13% 3 6% 3 3 3 3 4 6% 37%	4428
	11th to 20th	Night	18% 12% 4 9% 5% 3 4 2 4 4 35%	4439
	21st to end	Night	24% 12% 4 6% 3 3 3 2 4 5% 34%	4212
February	1st to 10th	Night	22% 12% 3 7% 4 4 3 3 4 5% 33%	2280
	11th to 20th	Night	21% 10% 3 8% 4 3 3 3 4 5% 37%	2218
	21st to end	Night	23% 9% 4 8% 4 4 4 3 5% 5% 33%	1884
March	1st to 10th	Night	24% 9% 3 7% 5% 4 4 3 4 6% 33%	3733
	11th to 20th	Night	14% 8% 2 5% 3 3 4 3 4 5% 48%	3653
	21st to end	Night	14% 8% 2 7% 4 5% 4 3 5% 7% 41%	3576
April	1st to 10th	Night	12% 6% 2 5% 4 3 4 3 5% 7% 47%	1900
	11th to 20th	Night	16% 6% 3 5% 3 4 3 3 4 6% 47%	1875
	21st to end	Night	14% 7% 2 6% 4 4 4 4 6% 7% 42%	1872
May	1st to 10th	Night	16% 8% 3 7% 4 4 4 3 5% 6% 40%	2813
	11th to 20th	Night	12% 8% 2 7% 4 4 4 4 5% 8% 42%	2812
	21st to end	Night	8% 5% 2 6% 5% 5% 4 4 7% 10% 44%	3079
June	1st to 10th	Night	10% 6% 2 7% 4 3 4 4 6% 8% 46%	1632
	11th to 20th	Night	4 3 1 4 3 4 4 4 7% 10% 55%	1520
	21st to end	Night	3 3 2 4 4 5% 5% 5% 7% 13% 49%	1520
July	1st to 10th	Night	6% 5% 2 6% 4 5% 5% 5% 9% 12% 42%	2530
	11th to 20th	Night	5% 5% 2 5% 3 5% 4 5% 7% 10% 50%	2530
	21st to end	Night	11% 9% 4 8% 6% 5% 6% 5% 7% 10% 31%	3080
August	1st to 10th	Night	5% 3 1 4 4 3 3 3 4 7% 63%	3040
	11th to 20th	Night	4 4 2 5% 4 4 5% 5% 7% 11% 49%	3100
	21st to end	Night	4 4 2 4 3 4 5% 3 6% 8% 57%	3476
September	1st to 10th	Night	11% 5% 2 6% 3 4 4 4 5% 7% 50%	1900
	11th to 20th	Night	11% 5% 2 5% 4 3 3 4 5% 8% 50%	2081
	21st to end	Night	10% 5% 2 5% 4 3 4 4 4 6% 54%	2090
October	1st to 10th	Night	9% 3 2 4 3 2 3 2 4 6% 62%	2090
	11th to 20th	Night	16% 5% 1 4 3 3 3 2 4 5% 53%	2156
	21st to end	Night	16% 6% 2 5% 3 3 3 3 4 6% 49%	2689
November	1st to 10th	Night	12% 5% 2 5% 4 3 3 3 4 5% 54%	2470
	11th to 20th	Night	13% 6% 2 5% 4 3 3 3 5% 6% 50%	2470
	21st to end	Night	16% 8% 3 6% 3 3 3 3 4 5% 46%	2470
December	1st to 10th	Night	21% 11% 3 6% 5% 4 3 3 5% 5% 35%	2470
	11th to 20th	Night	18% 9% 3 5% 3 3 3 3 4 5% 44%	3042
	21st to end	Night	18% 12% 5% 9% 5% 5% 4 4 4 6% 28%	4819

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% 3 6% 21% 11% 2	2528
	11th to 20th	Day	53% 4 7% 21% 15% 1	2530
	21st to end	Day	56% 2 7% 23% 11% 1	3422
February	1st to 10th	Day	51% 3 9% 20% 14% 2	1900
	11th to 20th	Day	52% 3 6% 20% 14% 4	1858
	21st to end	Day	51% 5% 7% 17% 15% 6%	1570
March	1st to 10th	Day	56% 4 4 16% 13% 7%	3120
	11th to 20th	Day	38% 5% 8% 25% 18% 5%	3306
	21st to end	Day	42% 5% 9% 26% 16% 1	4069
April	1st to 10th	Day	39% 5% 10% 23% 20% 3	2280
	11th to 20th	Day	42% 5% 7% 21% 21% 4	2254
	21st to end	Day	43% 5% 9% 25% 16% 2	2307
May	1st to 10th	Day	45% 8% 11% 22% 13% 1	4120
	11th to 20th	Day	45% 8% 10% 24% 13% 1	4085
	21st to end	Day	40% 8% 9% 21% 20% 1	4489
June	1st to 10th	Day	37% 8% 11% 24% 17% 3	2541
	11th to 20th	Day	30% 8% 15% 23% 19% 3	2660
	21st to end	Day	29% 10% 17% 24% 16% 5%	2660
July	1st to 10th	Day	37% 9% 17% 27% 8% 2	4371
	11th to 20th	Day	35% 8% 14% 30% 10% 2	4365
	21st to end	Day	55% 7% 11% 18% 7% 1	4329
August	1st to 10th	Day	25% 8% 14% 32% 21% 1	3871
	11th to 20th	Day	36% 7% 13% 26% 16% 1	3765
	21st to end	Day	27% 7% 9% 34% 22% 2	4179
September	1st to 10th	Day	40% 7% 9% 21% 19% 4	2268
	11th to 20th	Day	38% 5% 10% 23% 22% 2	2090
	21st to end	Day	35% 5% 9% 24% 21% 5%	2090
October	1st to 10th	Day	20% 4 6% 17% 45% 9%	3480
	11th to 20th	Day	24% 3 7% 25% 30% 12%	3339
	21st to end	Day	31% 2 5% 25% 29% 7%	3119
November	1st to 10th	Day	31% 4 9% 24% 28% 6%	1708
	11th to 20th	Day	37% 3 8% 23% 23% 7%	1710
	21st to end	Day	42% 3 7% 24% 20% 5%	1710
December	1st to 10th	Day	50% 3 8% 22% 15% 2	1710
	11th to 20th	Day	47% 5% 9% 22% 16% 2	2150
	21st to end	Day	52% 5% 11% 20% 10% 1	2841
January	1st to 10th	Night	48% 4 7% 25% 14% 1	4428
	11th to 20th	Night	54% 3 7% 18% 15% 4	4439
	21st to end	Night	54% 3 7% 22% 12% 1	4212
February	1st to 10th	Night	54% 3 8% 18% 15% 1	2280
	11th to 20th	Night	52% 3 6% 20% 15% 4	2219
	21st to end	Night	54% 4 7% 15% 16% 4	1884
March	1st to 10th	Night	53% 5% 7% 13% 16% 6%	3733
	11th to 20th	Night	38% 5% 9% 23% 15% 11%	3653
	21st to end	Night	44% 5% 9% 23% 18% 1	3576
April	1st to 10th	Night	36% 4 11% 25% 21% 3	1900
	11th to 20th	Night	39% 4 7% 20% 23% 7%	1875
	21st to end	Night	40% 6% 9% 27% 17% 2	1872
May	1st to 10th	Night	44% 7% 12% 23% 12% 2	2840
	11th to 20th	Night	39% 7% 14% 22% 16% 1	2813
	21st to end	Night	33% 9% 15% 24% 18% 1	3087
June	1st to 10th	Night	35% 7% 13% 25% 17% 3	1632
	11th to 20th	Night	22% 6% 17% 30% 21% 3	1520
	21st to end	Night	25% 9% 17% 29% 15% 5%	1520
July	1st to 10th	Night	31% 10% 16% 31% 10% 2	2490
	11th to 20th	Night	27% 8% 15% 36% 11% 3	2482
	21st to end	Night	48% 10% 13% 19% 8% 1	2982
August	1st to 10th	Night	21% 5% 11% 37% 24% 1	3029
	11th to 20th	Night	25% 8% 20% 30% 16% 1	3130
	21st to end	Night	23% 7% 10% 33% 24% 3	3476
September	1st to 10th	Night	33% 7% 11% 23% 21% 5%	1900
	11th to 20th	Night	32% 5% 11% 23% 26% 4	2081
	21st to end	Night	31% 6% 8% 23% 26% 7%	2090
October	1st to 10th	Night	18% 4 5% 18% 43% 11%	3480
	11th to 20th	Night	22% 2 5% 23% 33% 15%	3577
	21st to end	Night	26% 3 7% 24% 28% 11%	4427
November	1st to 10th	Night	33% 4 7% 23% 26% 7%	2470
	11th to 20th	Night	35% 3 6% 23% 25% 8%	2470
	21st to end	Night	41% 3 7% 24% 20% 4	2470
December	1st to 10th	Night	51% 4 8% 20% 15% 2	2470
	11th to 20th	Night	44% 3 7% 23% 20% 3	3044
	21st to end	Night	56% 4 8% 17% 11% 2	4819

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	22% 22% 35% 14% 7%	270
	11th to 20th	Day	27% 27% 32% 10% 4	270
	21st to end	Day	21% 25% 37% 14% 3	297
February	1st to 10th	Day	27% 24% 29% 17% 3 1	270
	11th to 20th	Day	32% 25% 31% 9% 2	270
	21st to end	Day	32% 26% 30% 10% 2	225
March	1st to 10th	Day	31% 20% 33% 13% 3 1	270
	11th to 20th	Day	25% 23% 33% 13% 6% 1	351
	21st to end	Day	24% 18% 33% 18% 7%	506
April	1st to 10th	Day	21% 18% 28% 24% 8%	460
	11th to 20th	Day	21% 16% 26% 24% 11% 1	452
	21st to end	Day	19% 15% 33% 19% 11% 3	460
May	1st to 10th	Day	21% 14% 27% 25% 10% 3	463
	11th to 20th	Day	17% 7% 24% 27% 18% 7%	487
	21st to end	Day	12% 7% 21% 27% 21% 12%	529
June	1st to 10th	Day	13% 4 21% 24% 22% 15%	561
	11th to 20th	Day	6% 3 20% 31% 27% 14%	680
	21st to end	Day	6% 4 20% 35% 23% 14%	680
July	1st to 10th	Day	10% 1 13% 29% 28% 19%	671
	11th to 20th	Day	7% 4 14% 25% 33% 17%	668
	21st to end	Day	12% 2 13% 27% 26% 20%	537
August	1st to 10th	Day	9% 2 13% 27% 31% 16%	486
	11th to 20th	Day	12% 2 15% 29% 33% 10%	479
	21st to end	Day	11% 2 9% 21% 38% 19%	539
September	1st to 10th	Day	12% 2 14% 24% 32% 15%	490
	11th to 20th	Day	13% 2 12% 26% 29% 16%	490
	21st to end	Day	14% 7% 21% 23% 28% 8%	490
October	1st to 10th	Day	11% 3 22% 28% 26% 9%	490
	11th to 20th	Day	13% 16% 29% 27% 13% 4	421
	21st to end	Day	23% 13% 28% 26% 8% 2	330
November	1st to 10th	Day	17% 11% 32% 25% 14% 2	282
	11th to 20th	Day	14% 18% 34% 29% 5%	270
	21st to end	Day	21% 14% 31% 21% 11% 1	270
December	1st to 10th	Day	23% 26% 25% 20% 6%	270
	11th to 20th	Day	22% 19% 30% 20% 9%	270
	21st to end	Day	23% 21% 35% 17% 4	297
January	1st to 10th	Night	24% 17% 30% 25% 4	950
	11th to 20th	Night	30% 17% 29% 21% 5%	949
	21st to end	Night	23% 14% 37% 24% 2	836
February	1st to 10th	Night	28% 12% 32% 24% 3	760
	11th to 20th	Night	28% 16% 32% 22% 2	743
	21st to end	Night	28% 18% 34% 18% 1	628
March	1st to 10th	Night	23% 14% 31% 28% 5%	760
	11th to 20th	Night	22% 13% 34% 24% 6% 1	760
	21st to end	Night	19% 13% 31% 27% 9%	698
April	1st to 10th	Night	14% 13% 35% 31% 7% 1	570
	11th to 20th	Night	18% 10% 33% 28% 10% 1	563
	21st to end	Night	16% 9% 33% 30% 11% 1	570
May	1st to 10th	Night	16% 8% 30% 28% 17% 1	570
	11th to 20th	Night	11% 6% 25% 35% 19% 4	561
	21st to end	Night	7% 1 18% 39% 29% 5%	617
June	1st to 10th	Night	12% 3 15% 34% 32% 4	570
	11th to 20th	Night	5% 2 11% 41% 36% 5%	570
	21st to end	Night	5% 2 12% 38% 37% 6%	570
July	1st to 10th	Night	9% 1 8% 29% 42% 10%	555
	11th to 20th	Night	7% 1 10% 30% 43% 9%	552
	21st to end	Night	8% 1 10% 31% 41% 9%	624
August	1st to 10th	Night	8% 1 8% 32% 44% 8%	567
	11th to 20th	Night	7% 1 9% 40% 39% 4	564
	21st to end	Night	8% 7% 32% 44% 9%	627
September	1st to 10th	Night	12% 1 12% 31% 39% 6%	570
	11th to 20th	Night	12% 3 13% 28% 38% 7%	751
	21st to end	Night	11% 3 17% 31% 33% 4	760
October	1st to 10th	Night	11% 3 19% 34% 28% 6%	760
	11th to 20th	Night	19% 7% 23% 33% 16% 2	760
	21st to end	Night	19% 7% 27% 30% 14% 2	836
November	1st to 10th	Night	14% 7% 22% 37% 18% 2	760
	11th to 20th	Night	16% 10% 33% 29% 11% 1	760
	21st to end	Night	20% 10% 28% 30% 12% 1	760
December	1st to 10th	Night	26% 12% 27% 28% 6%	760
	11th to 20th	Night	23% 10% 30% 30% 7% 1	760
	21st to end	Night	27% 13% 29% 26% 5%	1006

Page generated at 2024-11-03 01:11:09. Version ac07

Copyright © 2024 Attilla Danko.