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 2025-10-04.

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	13% 7% 3 7% 4 4 5% 4 6% 8% 40%	126277
	Night	14% 8% 3 7% 4 4 4 3 5% 7% 42%	123163
Transparency	Day	41% 6% 10% 23% 17% 3	129954
	Night	40% 5% 10% 23% 18% 4	127558
Seeing	Day	16% 11% 23% 23% 18% 8%	16495
	Night	17% 8% 24% 29% 18% 3	26164

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	14% 12% 9% 11% 4 4 4 3 4 5% 31%	3617
	11th to 20th	Day	15% 9% 3 11% 4 2 3 2 3 4 43%	3620
	21st to end	Day	21% 8% 5% 5% 3 3 3 3 5% 6% 39%	4904
February	1st to 10th	Day	18% 11% 4 7% 4 4 4 2 4 6% 36%	2000
	11th to 20th	Day	22% 9% 4 9% 4 3 3 2 4 6% 34%	1948
	21st to end	Day	18% 10% 3 8% 4 3 4 3 4 5% 37%	1650
March	1st to 10th	Day	18% 13% 3 8% 4 3 4 3 4 4 36%	4480
	11th to 20th	Day	13% 9% 2 6% 4 3 4 3 4 5% 47%	4722
	21st to end	Day	12% 8% 3 7% 4 4 4 3 5% 6% 43%	5829
April	1st to 10th	Day	14% 7% 2 5% 4 4 4 4 5% 7% 43%	2400
	11th to 20th	Day	14% 7% 3 6% 4 4 4 4 5% 7% 42%	2374
	21st to end	Day	14% 7% 3 7% 5% 4 5% 3 5% 7% 40%	2429
May	1st to 10th	Day	19% 10% 3 8% 4 5% 5% 4 7% 8% 27%	5862
	11th to 20th	Day	15% 9% 3 9% 5% 5% 5% 4 6% 8% 31%	5861
	21st to end	Day	14% 8% 3 8% 4 4 4 4 5% 8% 38%	6433
June	1st to 10th	Day	10% 5% 2 6% 5% 5% 5% 4 7% 8% 42%	2675
	11th to 20th	Day	6% 5% 2 6% 5% 5% 6% 5% 8% 10% 45%	2800
	21st to end	Day	5% 3 2 5% 5% 5% 6% 6% 9% 13% 43%	2800
July	1st to 10th	Day	7% 6% 2 7% 5% 6% 6% 4 7% 12% 39%	6360
	11th to 20th	Day	7% 5% 2 7% 5% 6% 7% 6% 9% 12% 35%	6360
	21st to end	Day	12% 7% 3 8% 5% 5% 6% 5% 7% 11% 30%	6429
August	1st to 10th	Day	4 3 1 4 5% 4 4 5% 7% 9% 53%	4007
	11th to 20th	Day	7% 5% 2 7% 5% 5% 6% 6% 7% 11% 40%	3849
	21st to end	Day	5% 4 2 5% 3 5% 5% 4 6% 9% 54%	4312
September	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	2387
	11th to 20th	Day	13% 5% 2 6% 5% 4 4 3 5% 7% 47%	2200
	21st to end	Day	10% 7% 2 6% 5% 3 4 4 4 6% 48%	2200
October	1st to 10th	Day	10% 4 1 4 3 3 3 4 4 6% 57%	2123
	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	15% 5% 1 4 3 3 3 2 5% 7% 54%	1762
	11th to 20th	Day	14% 7% 2 4 4 3 2 3 5% 7% 48%	1800
	21st to end	Day	15% 9% 2 5% 4 4 4 3 5% 5% 44%	1800
December	1st to 10th	Day	17% 8% 2 5% 4 4 4 2 5% 5% 43%	2930
	11th to 20th	Day	19% 11% 4 7% 5% 4 4 3 4 5% 33%	3373
	21st to end	Day	17% 13% 4 7% 5% 5% 5% 4 6% 6% 28%	4053
January	1st to 10th	Night	16% 13% 4 10% 3 3 3 3 4 6% 35%	6348
	11th to 20th	Night	17% 11% 4 8% 4 3 3 2 3 3 41%	6345
	21st to end	Night	20% 10% 4 7% 3 3 3 2 4 5% 40%	6030
February	1st to 10th	Night	22% 11% 3 7% 4 4 3 3 4 5% 33%	2400
	11th to 20th	Night	22% 10% 3 8% 4 3 4 3 4 5% 35%	2338
	21st to end	Night	22% 9% 4 7% 4 4 4 3 4 5% 35%	1980
March	1st to 10th	Night	19% 11% 3 7% 4 4 4 3 4 6% 35%	5373
	11th to 20th	Night	12% 7% 2 5% 3 4 4 4 5% 6% 49%	5223
	21st to end	Night	14% 8% 3 7% 4 4 4 3 5% 7% 40%	5128
April	1st to 10th	Night	13% 7% 2 6% 5% 3 4 3 5% 7% 46%	2000
	11th to 20th	Night	15% 6% 3 5% 3 4 3 3 4 6% 48%	1975
	21st to end	Night	14% 6% 3 6% 4 4 4 4 6% 8% 41%	1970
May	1st to 10th	Night	16% 9% 3 9% 5% 5% 4 4 6% 7% 32%	4033
	11th to 20th	Night	14% 9% 3 9% 5% 5% 4 4 5% 8% 32%	4032
	21st to end	Night	13% 7% 3 7% 5% 5% 4 4 6% 9% 37%	4421
June	1st to 10th	Night	9% 6% 2 7% 4 3 4 4 6% 8% 47%	1718
	11th to 20th	Night	4 3 1 4 4 4 4 4 7% 10% 54%	1600
	21st to end	Night	3 3 1 4 4 5% 5% 5% 7% 13% 49%	1600
July	1st to 10th	Night	7% 5% 2 6% 4 5% 4 5% 8% 11% 43%	3618
	11th to 20th	Night	4 6% 2 6% 4 5% 5% 5% 8% 13% 42%	3617
	21st to end	Night	8% 7% 3 7% 5% 5% 6% 5% 8% 13% 32%	4420
August	1st to 10th	Night	5% 3 1 4 4 3 3 3 4 7% 62%	3137
	11th to 20th	Night	4 4 2 5% 4 4 5% 5% 7% 11% 49%	3200
	21st to end	Night	4 4 2 4 3 4 5% 3 6% 8% 57%	3586
September	1st to 10th	Night	11% 5% 2 6% 3 4 4 4 5% 7% 50%	2000
	11th to 20th	Night	10% 5% 2 5% 4 3 3 4 5% 8% 51%	2191
	21st to end	Night	10% 5% 2 5% 4 3 4 4 5% 6% 53%	2200
October	1st to 10th	Night	9% 3 2 4 3 2 3 2 4 5% 63%	2124
	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	13% 5% 2 5% 4 3 3 2 4 5% 53%	2536
	11th to 20th	Night	13% 7% 2 5% 4 3 4 3 5% 6% 49%	2600
	21st to end	Night	16% 8% 3 6% 3 3 3 3 4 5% 46%	2600
December	1st to 10th	Night	18% 10% 3 8% 4 3 3 3 4 4 41%	4250
	11th to 20th	Night	22% 9% 3 6% 3 3 3 3 3 5% 40%	4822
	21st to end	Night	19% 12% 6% 10% 5% 5% 4 3 4 5% 27%	6903

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% 3 9% 18% 11% 2	3618
	11th to 20th	Day	46% 3 5% 24% 21% 1	3620
	21st to end	Day	47% 2 7% 22% 17% 5%	4904
February	1st to 10th	Day	51% 4 9% 21% 14% 2	2000
	11th to 20th	Day	54% 3 7% 19% 14% 4	1958
	21st to end	Day	49% 5% 7% 18% 15% 6%	1650
March	1st to 10th	Day	52% 4 4 15% 17% 8%	4480
	11th to 20th	Day	40% 4 6% 23% 20% 7%	4722
	21st to end	Day	41% 5% 8% 28% 17% 1	5831
April	1st to 10th	Day	39% 5% 10% 23% 20% 3	2400
	11th to 20th	Day	41% 5% 7% 22% 20% 5%	2374
	21st to end	Day	44% 5% 9% 25% 16% 2	2429
May	1st to 10th	Day	51% 9% 12% 19% 9% 1	5897
	11th to 20th	Day	50% 8% 12% 19% 10%	5865
	21st to end	Day	44% 7% 8% 22% 17% 2	6447
June	1st to 10th	Day	37% 8% 11% 25% 17% 2	2675
	11th to 20th	Day	32% 8% 15% 23% 19% 3	2800
	21st to end	Day	29% 11% 16% 24% 16% 5%	2800
July	1st to 10th	Day	36% 9% 16% 27% 11% 2	6291
	11th to 20th	Day	36% 11% 18% 27% 7% 1	6285
	21st to end	Day	45% 9% 18% 21% 6% 1	6245
August	1st to 10th	Day	25% 8% 14% 31% 21% 1	3994
	11th to 20th	Day	36% 7% 13% 27% 16% 1	3885
	21st to end	Day	27% 7% 9% 34% 22% 2	4311
September	1st to 10th	Day	39% 7% 9% 21% 19% 4	2387
	11th to 20th	Day	37% 5% 9% 24% 22% 2	2200
	21st to end	Day	36% 5% 9% 23% 22% 5%	2200
October	1st to 10th	Day	20% 4 6% 17% 44% 9%	3513
	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	33% 4 8% 23% 27% 5%	1762
	11th to 20th	Day	37% 3 7% 23% 23% 7%	1800
	21st to end	Day	42% 3 7% 24% 20% 4	1800
December	1st to 10th	Day	43% 3 6% 27% 19% 1	2930
	11th to 20th	Day	52% 5% 7% 21% 13% 2	3370
	21st to end	Day	54% 5% 10% 22% 8% 1	4053
January	1st to 10th	Night	51% 3 9% 21% 14% 1	6348
	11th to 20th	Night	49% 3 5% 20% 20% 3	6345
	21st to end	Night	49% 3 5% 22% 16% 6%	6030
February	1st to 10th	Night	54% 3 8% 18% 15% 1	2400
	11th to 20th	Night	53% 3 6% 19% 14% 4	2339
	21st to end	Night	52% 4 7% 16% 17% 4	1980
March	1st to 10th	Night	50% 4 6% 15% 18% 7%	5373
	11th to 20th	Night	35% 5% 7% 21% 19% 13%	5223
	21st to end	Night	44% 4 9% 25% 16% 2	5128
April	1st to 10th	Night	38% 4 10% 24% 20% 3	2000
	11th to 20th	Night	38% 4 8% 21% 22% 7%	1975
	21st to end	Night	40% 6% 10% 26% 16% 2	1970
May	1st to 10th	Night	50% 7% 12% 20% 9% 1	4060
	11th to 20th	Night	49% 8% 14% 18% 12%	4033
	21st to end	Night	42% 8% 13% 22% 14% 1	4429
June	1st to 10th	Night	34% 7% 13% 25% 17% 3	1718
	11th to 20th	Night	24% 7% 16% 29% 21% 3	1600
	21st to end	Night	25% 9% 17% 29% 15% 5%	1600
July	1st to 10th	Night	31% 10% 15% 27% 14% 2	3580
	11th to 20th	Night	31% 11% 21% 28% 8% 2	3572
	21st to end	Night	39% 11% 20% 22% 6% 1	4291
August	1st to 10th	Night	22% 6% 11% 38% 24% 1	3126
	11th to 20th	Night	25% 8% 20% 30% 16% 1	3230
	21st to end	Night	23% 7% 10% 32% 25% 3	3586
September	1st to 10th	Night	33% 7% 12% 23% 22% 5%	2000
	11th to 20th	Night	31% 5% 10% 23% 26% 4	2191
	21st to end	Night	31% 6% 8% 22% 26% 7%	2200
October	1st to 10th	Night	18% 4 5% 19% 43% 11%	3514
	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	35% 3 7% 23% 25% 7%	2536
	11th to 20th	Night	35% 3 7% 23% 25% 7%	2600
	21st to end	Night	41% 3 7% 25% 19% 5%	2600
December	1st to 10th	Night	47% 4 6% 19% 23% 2	4250
	11th to 20th	Night	48% 3 6% 23% 18% 2	4824
	21st to end	Night	59% 4 7% 19% 9% 2	6903

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	23% 21% 35% 14% 6%	300
	11th to 20th	Day	26% 27% 33% 10% 3	300
	21st to end	Day	20% 25% 39% 13% 3	330
February	1st to 10th	Day	26% 25% 30% 17% 2 1	300
	11th to 20th	Day	34% 26% 30% 8% 2	300
	21st to end	Day	29% 24% 34% 10% 2	249
March	1st to 10th	Day	31% 21% 31% 14% 3 1	300
	11th to 20th	Day	25% 23% 33% 13% 5% 1	385
	21st to end	Day	24% 18% 34% 17% 7%	550
April	1st to 10th	Day	23% 18% 29% 23% 8%	500
	11th to 20th	Day	22% 16% 27% 24% 10% 1	492
	21st to end	Day	19% 15% 33% 19% 11% 3	500
May	1st to 10th	Day	22% 15% 27% 24% 9% 3	503
	11th to 20th	Day	17% 8% 25% 26% 17% 7%	527
	21st to end	Day	14% 7% 22% 26% 19% 12%	573
June	1st to 10th	Day	13% 5% 21% 26% 21% 14%	605
	11th to 20th	Day	7% 4 20% 30% 27% 13%	730
	21st to end	Day	5% 3 18% 34% 25% 15%	730
July	1st to 10th	Day	9% 1 13% 29% 29% 18%	721
	11th to 20th	Day	7% 4 13% 25% 34% 16%	718
	21st to end	Day	11% 2 13% 26% 28% 20%	581
August	1st to 10th	Day	10% 2 13% 26% 32% 16%	526
	11th to 20th	Day	12% 2 14% 28% 34% 11%	519
	21st to end	Day	10% 2 10% 23% 36% 18%	583
September	1st to 10th	Day	11% 3 15% 26% 31% 14%	530
	11th to 20th	Day	13% 2 12% 26% 31% 16%	530
	21st to end	Day	14% 7% 21% 24% 27% 7%	530
October	1st to 10th	Day	11% 3 21% 28% 27% 9%	502
	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	19% 12% 30% 24% 13% 2	300
	11th to 20th	Day	15% 19% 33% 28% 4	300
	21st to end	Day	22% 15% 30% 21% 11% 1	300
December	1st to 10th	Day	23% 24% 28% 19% 5%	300
	11th to 20th	Day	25% 17% 30% 19% 8%	300
	21st to end	Day	24% 20% 34% 18% 4	330
January	1st to 10th	Night	24% 17% 30% 25% 4	1000
	11th to 20th	Night	29% 17% 29% 21% 4	998
	21st to end	Night	23% 14% 37% 24% 2	880
February	1st to 10th	Night	28% 13% 33% 24% 3	800
	11th to 20th	Night	29% 16% 32% 21% 2	783
	21st to end	Night	27% 18% 34% 20% 2	660
March	1st to 10th	Night	23% 14% 31% 27% 5%	800
	11th to 20th	Night	22% 13% 34% 24% 6% 1	800
	21st to end	Night	19% 14% 32% 27% 8%	735
April	1st to 10th	Night	15% 13% 35% 30% 7% 1	600
	11th to 20th	Night	17% 10% 33% 29% 10% 1	593
	21st to end	Night	16% 9% 33% 30% 11% 1	600
May	1st to 10th	Night	16% 8% 31% 28% 16% 1	600
	11th to 20th	Night	11% 7% 25% 34% 19% 4	591
	21st to end	Night	7% 2 20% 39% 28% 5%	650
June	1st to 10th	Night	12% 3 15% 35% 32% 4	600
	11th to 20th	Night	6% 2 11% 41% 36% 5%	600
	21st to end	Night	5% 2 12% 38% 38% 7%	600
July	1st to 10th	Night	9% 2 8% 30% 42% 10%	585
	11th to 20th	Night	7% 1 10% 29% 44% 9%	582
	21st to end	Night	8% 1 10% 30% 42% 9%	657
August	1st to 10th	Night	8% 1 9% 31% 44% 8%	597
	11th to 20th	Night	7% 1 9% 40% 39% 4	594
	21st to end	Night	8% 9% 32% 42% 9%	660
September	1st to 10th	Night	11% 1 12% 32% 38% 6%	600
	11th to 20th	Night	12% 3 12% 28% 39% 6%	791
	21st to end	Night	12% 3 18% 32% 32% 4	800
October	1st to 10th	Night	11% 3 19% 34% 28% 6%	773
	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	16% 7% 22% 36% 17% 2	780
	11th to 20th	Night	17% 10% 33% 30% 11% 1	800
	21st to end	Night	20% 11% 28% 30% 11% 1	800
December	1st to 10th	Night	27% 13% 27% 28% 6%	800
	11th to 20th	Night	23% 11% 29% 30% 7% 1	800
	21st to end	Night	27% 13% 29% 26% 5%	1059

Page generated at 2025-10-01 00:39:05. Version ac07

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