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 2024-01-12.

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 5% 5% 3 5% 5% 5% 8% 41%	74948
	Night	14% 7% 3 5% 5% 3 4 4 5% 7% 44%	74764
Transparency	Day	41% 6% 11% 22% 17% 3	74661
	Night	40% 5% 10% 23% 18% 4	74572
Seeing	Day	16% 10% 23% 24% 19% 9%	14098
	Night	17% 8% 24% 29% 18% 3	23946

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	16% 9% 5% 7% 5% 3 5% 4 4 6% 37%	1517
	11th to 20th	Day	21% 12% 4 8% 5% 2 4 3 4 6% 32%	1448
	21st to end	Day	16% 7% 4 6% 4 3 3 3 4 5% 43%	1954
February	1st to 10th	Day	18% 11% 4 6% 5% 3 4 4 4 6% 35%	1800
	11th to 20th	Day	23% 8% 4 7% 5% 2 4 3 4 7% 34%	1748
	21st to end	Day	20% 9% 3 7% 5% 3 4 4 4 5% 36%	1480
March	1st to 10th	Day	17% 11% 2 5% 5% 3 4 5% 4 5% 40%	1800
	11th to 20th	Day	21% 8% 3 6% 6% 3 4 4 4 5% 36%	1876
	21st to end	Day	16% 9% 4 7% 6% 3 5% 4 5% 7% 33%	2322
April	1st to 10th	Day	12% 6% 3 4 4 3 4 5% 5% 7% 45%	2160
	11th to 20th	Day	15% 6% 3 5% 6% 2 4 5% 4 7% 42%	2134
	21st to end	Day	15% 6% 3 6% 6% 2 5% 5% 5% 6% 40%	2185
May	1st to 10th	Day	17% 5% 2 5% 4 3 5% 5% 6% 7% 41%	2340
	11th to 20th	Day	13% 8% 3 6% 6% 4 4 4 5% 7% 39%	2301
	21st to end	Day	9% 5% 2 7% 6% 4 7% 6% 6% 10% 38%	2531
June	1st to 10th	Day	11% 5% 2 4 5% 4 5% 5% 7% 8% 43%	2407
	11th to 20th	Day	5% 4 2 5% 5% 3 6% 6% 8% 10% 46%	2520
	21st to end	Day	5% 2 2 4 5% 4 6% 7% 8% 13% 44%	2520
July	1st to 10th	Day	8% 6% 3 7% 7% 5% 6% 6% 7% 11% 34%	2520
	11th to 20th	Day	8% 5% 2 5% 6% 4 7% 7% 7% 10% 39%	2520
	21st to end	Day	8% 5% 3 7% 6% 4 7% 6% 7% 11% 38%	2552
August	1st to 10th	Day	6% 4 2 5% 7% 3 6% 8% 8% 10% 39%	2205
	11th to 20th	Day	9% 5% 3 6% 6% 3 6% 6% 7% 10% 38%	2125
	21st to end	Day	9% 5% 3 5% 5% 4 6% 6% 7% 9% 41%	2376
September	1st to 10th	Day	12% 5% 3 5% 5% 4 5% 5% 6% 8% 40%	2149
	11th to 20th	Day	14% 5% 2 5% 6% 3 3 4 5% 7% 46%	1980
	21st to end	Day	10% 6% 2 4 5% 3 4 4 4 7% 51%	1980
October	1st to 10th	Day	11% 4 2 4 4 2 4 5% 4 6% 56%	1980
	11th to 20th	Day	13% 4 2 5% 4 2 3 4 4 5% 52%	1915
	21st to end	Day	20% 5% 2 5% 3 3 4 3 3 5% 46%	1807
November	1st to 10th	Day	14% 4 1 4 3 2 2 2 5% 7% 56%	1672
	11th to 20th	Day	14% 6% 2 4 5% 2 3 4 4 6% 49%	1710
	21st to end	Day	16% 8% 2 4 5% 2 4 3 4 6% 45%	1710
December	1st to 10th	Day	22% 10% 3 5% 4 2 4 3 5% 6% 36%	1710
	11th to 20th	Day	16% 11% 3 5% 5% 3 5% 5% 5% 6% 37%	2153
	21st to end	Day	15% 12% 5% 6% 6% 4 5% 5% 6% 7% 30%	2841
January	1st to 10th	Night	18% 10% 4 7% 5% 2 4 3 4 6% 39%	2648
	11th to 20th	Night	22% 11% 4 8% 6% 3 5% 4 4 4 30%	2540
	21st to end	Night	17% 9% 3 6% 5% 2 4 4 4 6% 39%	2394
February	1st to 10th	Night	23% 11% 4 6% 5% 3 4 4 4 5% 32%	2160
	11th to 20th	Night	21% 9% 4 7% 5% 2 4 3 4 5% 36%	2098
	21st to end	Night	23% 9% 4 7% 5% 3 4 3 5% 4 32%	1776
March	1st to 10th	Night	16% 7% 3 5% 5% 3 5% 4 5% 7% 40%	2160
	11th to 20th	Night	19% 9% 4 6% 5% 3 4 3 4 6% 38%	2083
	21st to end	Night	15% 9% 3 7% 6% 3 4 4 6% 6% 37%	2048
April	1st to 10th	Night	11% 6% 3 4 5% 2 5% 3 5% 8% 48%	1800
	11th to 20th	Night	16% 6% 3 5% 3 3 4 3 4 7% 48%	1775
	21st to end	Night	14% 6% 3 6% 4 3 5% 5% 6% 8% 42%	1774
May	1st to 10th	Night	13% 6% 2 5% 4 3 5% 4 5% 6% 46%	1620
	11th to 20th	Night	10% 6% 2 6% 5% 3 5% 5% 5% 10% 43%	1592
	21st to end	Night	6% 4 2 6% 5% 4 5% 6% 8% 11% 45%	1744
June	1st to 10th	Night	9% 5% 3 6% 4 2 4 5% 5% 8% 48%	1547
	11th to 20th	Night	4 3 1 3 4 3 4 5% 7% 11% 55%	1440
	21st to end	Night	3 3 2 4 4 3 6% 6% 8% 13% 49%	1440
July	1st to 10th	Night	7% 5% 2 4 5% 4 5% 6% 8% 12% 42%	1440
	11th to 20th	Night	6% 5% 2 4 4 4 5% 5% 6% 10% 47%	1440
	21st to end	Night	7% 3 2 3 4 3 5% 6% 9% 11% 48%	1764
August	1st to 10th	Night	7% 4 2 4 6% 3 4 5% 6% 9% 50%	1728
	11th to 20th	Night	6% 5% 2 5% 4 3 5% 5% 8% 10% 47%	1776
	21st to end	Night	7% 4 2 4 4 3 6% 5% 7% 9% 47%	1980
September	1st to 10th	Night	11% 4 2 5% 4 3 5% 5% 5% 7% 49%	1800
	11th to 20th	Night	11% 4 2 4 5% 3 3 4 5% 8% 51%	1971
	21st to end	Night	9% 4 1 4 5% 3 3 5% 4 6% 56%	1980
October	1st to 10th	Night	10% 3 2 3 3 2 3 3 4 6% 61%	1980
	11th to 20th	Night	17% 5% 1 4 4 3 3 3 4 6% 50%	2042
	21st to end	Night	17% 6% 3 4 4 2 4 3 4 6% 48%	2547
November	1st to 10th	Night	12% 5% 2 5% 4 2 3 3 4 5% 55%	2406
	11th to 20th	Night	13% 6% 2 4 5% 2 3 4 5% 6% 50%	2470
	21st to end	Night	16% 7% 3 5% 4 2 3 4 4 5% 46%	2470
December	1st to 10th	Night	21% 10% 3 6% 5% 3 4 4 4 5% 36%	2470
	11th to 20th	Night	18% 8% 3 5% 3 2 4 4 4 5% 44%	3042
	21st to end	Night	18% 12% 5% 8% 6% 4 5% 4 4 6% 29%	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	50% 3 8% 21% 14% 3	1518
	11th to 20th	Day	55% 4 7% 20% 14% 1	1448
	21st to end	Day	45% 3 10% 25% 16% 2	1954
February	1st to 10th	Day	52% 4 9% 20% 13% 2	1800
	11th to 20th	Day	53% 3 7% 21% 13% 3	1758
	21st to end	Day	51% 5% 7% 17% 14% 6%	1480
March	1st to 10th	Day	47% 4 7% 19% 18% 5%	1800
	11th to 20th	Day	52% 5% 8% 20% 14% 2	1876
	21st to end	Day	50% 5% 11% 20% 12% 2	2322
April	1st to 10th	Day	37% 5% 10% 24% 21% 3	2160
	11th to 20th	Day	42% 5% 7% 21% 21% 4	2134
	21st to end	Day	44% 4 9% 25% 16% 2	2185
May	1st to 10th	Day	41% 6% 12% 25% 14% 2	2340
	11th to 20th	Day	44% 7% 10% 23% 15% 1	2305
	21st to end	Day	40% 9% 13% 24% 13% 2	2531
June	1st to 10th	Day	37% 8% 11% 25% 17% 2	2407
	11th to 20th	Day	31% 9% 16% 24% 18% 3	2520
	21st to end	Day	29% 10% 16% 24% 15% 5%	2520
July	1st to 10th	Day	41% 10% 14% 19% 12% 4	2451
	11th to 20th	Day	37% 10% 17% 20% 12% 3	2445
	21st to end	Day	37% 9% 16% 25% 11% 2	2410
August	1st to 10th	Day	35% 11% 16% 25% 13% 1	2192
	11th to 20th	Day	40% 8% 12% 23% 16% 2	2125
	21st to end	Day	37% 9% 12% 24% 15% 3	2376
September	1st to 10th	Day	40% 8% 10% 22% 18% 3	2149
	11th to 20th	Day	38% 5% 9% 23% 22% 2	1980
	21st to end	Day	33% 5% 9% 25% 22% 5%	1980
October	1st to 10th	Day	30% 6% 8% 24% 27% 5%	1980
	11th to 20th	Day	35% 4 7% 20% 26% 9%	1915
	21st to end	Day	42% 4 6% 21% 23% 5%	1807
November	1st to 10th	Day	31% 3 8% 24% 28% 6%	1672
	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	49% 3 9% 22% 16% 2	2648
	11th to 20th	Night	58% 4 6% 18% 13% 2	2540
	21st to end	Night	47% 3 9% 22% 15% 2	2394
February	1st to 10th	Night	55% 3 8% 18% 14% 1	2160
	11th to 20th	Night	53% 3 6% 21% 13% 4	2099
	21st to end	Night	55% 4 7% 15% 15% 4	1776
March	1st to 10th	Night	44% 5% 8% 16% 20% 7%	2160
	11th to 20th	Night	49% 4 8% 21% 15% 3	2083
	21st to end	Night	47% 5% 11% 22% 13% 2	2048
April	1st to 10th	Night	35% 4 11% 26% 21% 3	1800
	11th to 20th	Night	38% 4 8% 20% 23% 7%	1775
	21st to end	Night	40% 6% 9% 27% 17% 2	1774
May	1st to 10th	Night	39% 5% 10% 25% 18% 3	1620
	11th to 20th	Night	36% 8% 17% 23% 16% 1	1593
	21st to end	Night	31% 10% 17% 24% 16% 2	1745
June	1st to 10th	Night	34% 7% 13% 25% 18% 3	1547
	11th to 20th	Night	22% 7% 18% 31% 19% 4	1440
	21st to end	Night	25% 9% 18% 29% 14% 5%	1440
July	1st to 10th	Night	32% 11% 15% 25% 13% 3	1400
	11th to 20th	Night	31% 8% 17% 23% 16% 5%	1392
	21st to end	Night	28% 10% 17% 30% 13% 2	1666
August	1st to 10th	Night	30% 8% 15% 27% 19%	1717
	11th to 20th	Night	28% 9% 20% 23% 17% 2	1776
	21st to end	Night	31% 9% 13% 27% 16% 5%	1980
September	1st to 10th	Night	33% 7% 11% 24% 20% 4	1800
	11th to 20th	Night	31% 5% 10% 23% 26% 4	1971
	21st to end	Night	29% 6% 8% 23% 27% 7%	1980
October	1st to 10th	Night	26% 5% 7% 25% 29% 8%	1980
	11th to 20th	Night	37% 4 7% 21% 23% 7%	2042
	21st to end	Night	39% 3 5% 22% 24% 5%	2547
November	1st to 10th	Night	33% 3 7% 24% 26% 7%	2406
	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	26% 25% 33% 12% 4	243
	21st to end	Day	18% 27% 38% 14% 3	264
February	1st to 10th	Day	27% 25% 30% 15% 2 1	240
	11th to 20th	Day	35% 24% 31% 9% 1	240
	21st to end	Day	31% 26% 30% 12% 2	198
March	1st to 10th	Day	30% 20% 35% 12% 3	240
	11th to 20th	Day	26% 23% 31% 12% 6% 1	316
	21st to end	Day	25% 18% 31% 18% 8%	462
April	1st to 10th	Day	19% 17% 28% 25% 9%	420
	11th to 20th	Day	21% 15% 26% 25% 11% 1	412
	21st to end	Day	20% 15% 31% 19% 11% 3	420
May	1st to 10th	Day	20% 13% 26% 27% 9% 3	423
	11th to 20th	Day	17% 7% 25% 27% 17% 7%	447
	21st to end	Day	13% 5% 20% 27% 22% 13%	485
June	1st to 10th	Day	14% 3 19% 25% 23% 16%	517
	11th to 20th	Day	6% 3 20% 31% 27% 14%	630
	21st to end	Day	5% 3 20% 35% 23% 14%	630
July	1st to 10th	Day	10% 13% 28% 28% 20%	621
	11th to 20th	Day	7% 4 13% 24% 33% 18%	618
	21st to end	Day	10% 1 12% 27% 28% 22%	493
August	1st to 10th	Day	9% 3 12% 26% 33% 17%	446
	11th to 20th	Day	13% 1 13% 28% 34% 10%	439
	21st to end	Day	12% 2 10% 20% 38% 17%	495
September	1st to 10th	Day	12% 1 14% 24% 33% 16%	450
	11th to 20th	Day	13% 2 12% 26% 30% 17%	450
	21st to end	Day	13% 6% 20% 24% 29% 8%	450
October	1st to 10th	Day	12% 4 23% 28% 24% 9%	450
	11th to 20th	Day	14% 16% 29% 28% 11% 3	385
	21st to end	Day	25% 13% 27% 25% 8% 2	297
November	1st to 10th	Day	17% 11% 31% 24% 15% 2	270
	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	29% 17% 28% 22% 5%	907
	21st to end	Night	22% 14% 37% 24% 3	792
February	1st to 10th	Night	28% 13% 32% 23% 3	720
	11th to 20th	Night	28% 16% 33% 21% 2	703
	21st to end	Night	29% 18% 33% 19% 2	592
March	1st to 10th	Night	22% 14% 31% 28% 4	720
	11th to 20th	Night	23% 13% 34% 24% 6% 1	720
	21st to end	Night	19% 13% 30% 28% 9%	662
April	1st to 10th	Night	14% 12% 35% 31% 8% 1	540
	11th to 20th	Night	18% 9% 32% 29% 11% 1	533
	21st to end	Night	16% 8% 32% 31% 11% 1	540
May	1st to 10th	Night	16% 7% 31% 28% 17% 1	540
	11th to 20th	Night	11% 6% 26% 34% 19% 4	531
	21st to end	Night	7% 1 18% 39% 30% 5%	584
June	1st to 10th	Night	11% 3 14% 34% 34% 4	540
	11th to 20th	Night	5% 1 10% 41% 36% 6%	540
	21st to end	Night	5% 1 13% 38% 37% 6%	540
July	1st to 10th	Night	9% 1 8% 28% 42% 11%	525
	11th to 20th	Night	8% 1 10% 29% 43% 10%	522
	21st to end	Night	7% 1 10% 31% 42% 9%	591
August	1st to 10th	Night	8% 1 7% 32% 44% 8%	537
	11th to 20th	Night	7% 1 8% 40% 40% 4	534
	21st to end	Night	9% 7% 32% 44% 8%	594
September	1st to 10th	Night	12% 1 11% 31% 40% 6%	540
	11th to 20th	Night	12% 2 13% 28% 38% 7%	711
	21st to end	Night	10% 2 18% 32% 33% 5%	720
October	1st to 10th	Night	11% 3 19% 33% 27% 6%	720
	11th to 20th	Night	20% 7% 23% 33% 15% 2	720
	21st to end	Night	20% 8% 27% 30% 14% 2	792
November	1st to 10th	Night	14% 7% 22% 37% 18% 2	740
	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 2024-01-09 06:14:45. Version ac07

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