Lloyd Manor Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lloyd Manor Park clear sky chart from 2005-11-06 to 2026-02-01.

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	15% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	127696
	Night	15% 9% 3 8% 5% 5% 5% 4 5% 7% 34%	124204
Transparency	Day	48% 4 12% 22% 12% 1	131290
	Night	49% 3 12% 22% 13% 1	128696
Seeing	Day	18% 11% 29% 25% 13% 5%	15913
	Night	19% 8% 29% 30% 12% 1	25444

By Month

Percentage Cloud Cover NE (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% 12% 4 12% 7% 5% 6% 4 7% 5% 25%	3677
	11th to 20th	Day	11% 17% 6% 18% 9% 6% 5% 3 4 5% 16%	4022
	21st to end	Day	17% 16% 6% 12% 6% 5% 5% 4 5% 4 20%	4565
February	1st to 10th	Day	15% 14% 4 13% 7% 6% 5% 4 5% 6% 23%	1800
	11th to 20th	Day	13% 14% 6% 11% 9% 5% 4 4 5% 6% 25%	1753
	21st to end	Day	17% 12% 4 11% 6% 5% 4 4 5% 5% 26%	1545
March	1st to 10th	Day	18% 9% 3 9% 5% 4 4 3 5% 6% 32%	4932
	11th to 20th	Day	12% 12% 4 9% 5% 4 5% 4 6% 8% 31%	4980
	21st to end	Day	18% 10% 4 9% 5% 5% 4 3 5% 5% 34%	5465
April	1st to 10th	Day	16% 12% 4 8% 5% 5% 4 4 6% 5% 30%	2357
	11th to 20th	Day	18% 10% 3 7% 5% 4 4 3 5% 6% 36%	2454
	21st to end	Day	19% 8% 3 7% 5% 5% 5% 3 5% 6% 34%	2600
May	1st to 10th	Day	19% 8% 3 8% 4 4 4 4 5% 7% 33%	5888
	11th to 20th	Day	16% 9% 3 8% 5% 4 4 4 6% 8% 34%	6262
	21st to end	Day	18% 6% 2 7% 4 4 5% 4 6% 7% 39%	6949
June	1st to 10th	Day	14% 6% 2 6% 6% 5% 5% 4 7% 8% 39%	2800
	11th to 20th	Day	11% 5% 2 6% 5% 5% 5% 5% 8% 9% 39%	2800
	21st to end	Day	12% 5% 2 6% 5% 5% 5% 4 7% 9% 40%	2800
July	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 5% 7% 10% 41%	6360
	11th to 20th	Day	8% 4 2 6% 4 4 5% 4 7% 9% 48%	6360
	21st to end	Day	7% 4 2 5% 4 5% 5% 4 7% 9% 48%	6452
August	1st to 10th	Day	16% 6% 2 5% 4 4 4 4 6% 8% 39%	4234
	11th to 20th	Day	10% 6% 3 7% 6% 5% 5% 4 7% 9% 37%	4174
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 7% 9% 45%	4492
September	1st to 10th	Day	12% 5% 2 6% 4 5% 5% 4 6% 8% 43%	2400
	11th to 20th	Day	10% 5% 3 5% 4 4 4 4 6% 9% 47%	2275
	21st to end	Day	13% 6% 3 7% 5% 5% 6% 4 5% 9% 37%	2163
October	1st to 10th	Day	17% 8% 3 6% 4 4 4 4 6% 6% 38%	2000
	11th to 20th	Day	19% 8% 3 8% 6% 5% 5% 4 5% 7% 31%	2000
	21st to end	Day	23% 9% 4 7% 6% 5% 5% 5% 6% 6% 23%	2200
November	1st to 10th	Day	15% 9% 4 8% 5% 5% 4 3 6% 8% 34%	1783
	11th to 20th	Day	14% 13% 3 8% 6% 5% 5% 6% 5% 8% 27%	1680
	21st to end	Day	17% 14% 5% 8% 6% 6% 5% 3 6% 8% 22%	1680
December	1st to 10th	Day	18% 16% 4 10% 6% 7% 5% 5% 5% 6% 17%	2680
	11th to 20th	Day	21% 15% 4 10% 5% 4 4 4 4 5% 23%	3066
	21st to end	Day	27% 16% 5% 11% 5% 4 4 2 4 4 16%	4048
January	1st to 10th	Night	14% 12% 4 10% 6% 6% 6% 4 6% 7% 27%	6489
	11th to 20th	Night	12% 14% 5% 14% 9% 6% 5% 4 5% 6% 18%	6066
	21st to end	Night	17% 13% 5% 11% 6% 5% 5% 4 5% 6% 23%	6633
February	1st to 10th	Night	14% 14% 5% 9% 6% 5% 5% 4 6% 6% 25%	2601
	11th to 20th	Night	14% 14% 4 10% 6% 5% 5% 4 5% 5% 27%	2533
	21st to end	Night	14% 10% 5% 10% 6% 6% 5% 4 6% 6% 28%	2079
March	1st to 10th	Night	17% 9% 4 8% 6% 6% 5% 4 5% 6% 32%	4908
	11th to 20th	Night	10% 8% 3 7% 5% 4 5% 4 7% 8% 37%	4979
	21st to end	Night	20% 8% 3 6% 4 3 3 3 4 5% 40%	5467
April	1st to 10th	Night	18% 10% 3 8% 5% 5% 4 4 6% 5% 32%	2042
	11th to 20th	Night	16% 8% 3 7% 5% 5% 5% 3 5% 6% 38%	1912
	21st to end	Night	17% 8% 3 7% 5% 4 4 4 6% 7% 37%	1800
May	1st to 10th	Night	22% 8% 2 7% 4 4 4 3 5% 6% 35%	4053
	11th to 20th	Night	15% 7% 3 7% 4 5% 4 4 5% 8% 38%	3627
	21st to end	Night	17% 6% 2 6% 4 3 4 3 5% 7% 44%	3926
June	1st to 10th	Night	12% 5% 2 5% 5% 5% 5% 4 6% 8% 43%	1600
	11th to 20th	Night	10% 6% 2 6% 5% 4 4 5% 7% 9% 43%	1600
	21st to end	Night	10% 5% 3 6% 5% 4 4 5% 6% 8% 45%	1509
July	1st to 10th	Night	7% 5% 2 5% 4 4 4 4 7% 9% 48%	3600
	11th to 20th	Night	10% 4 2 4 4 4 4 4 6% 9% 50%	3600
	21st to end	Night	8% 4 2 5% 4 4 4 3 6% 8% 53%	4396
August	1st to 10th	Night	10% 5% 2 6% 5% 4 5% 4 6% 7% 47%	2915
	11th to 20th	Night	11% 4 2 6% 3 3 4 3 5% 8% 50%	2875
	21st to end	Night	10% 5% 2 6% 3 4 4 4 6% 8% 47%	3372
September	1st to 10th	Night	9% 5% 2 6% 4 3 5% 4 7% 8% 48%	2000
	11th to 20th	Night	10% 4 1 5% 3 3 4 3 5% 7% 56%	2121
	21st to end	Night	15% 7% 3 7% 4 4 4 3 5% 7% 42%	2236
October	1st to 10th	Night	15% 6% 3 7% 4 3 4 4 5% 6% 42%	2400
	11th to 20th	Night	18% 9% 3 7% 5% 4 4 3 4 6% 36%	2400
	21st to end	Night	20% 8% 3 8% 5% 4 5% 3 6% 6% 32%	2640
November	1st to 10th	Night	16% 8% 2 7% 5% 5% 4 3 5% 7% 39%	2727
	11th to 20th	Night	15% 11% 3 8% 5% 5% 6% 4 6% 7% 31%	2940
	21st to end	Night	20% 11% 3 8% 6% 5% 5% 4 6% 7% 26%	2940
December	1st to 10th	Night	18% 14% 5% 10% 6% 5% 5% 4 7% 6% 20%	4720
	11th to 20th	Night	17% 17% 4 10% 5% 5% 5% 4 5% 5% 23%	5348
	21st to end	Night	25% 15% 7% 10% 5% 4 4 3 4 5% 17%	7150

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% 4 13% 15% 10%	3678
	11th to 20th	Day	70% 3 9% 12% 5%	4056
	21st to end	Day	67% 3 10% 13% 8%	4565
February	1st to 10th	Day	62% 3 12% 18% 4 1	1800
	11th to 20th	Day	62% 3 9% 16% 9% 2	1762
	21st to end	Day	59% 3 10% 20% 8% 1	1545
March	1st to 10th	Day	54% 2 13% 17% 13% 1	4935
	11th to 20th	Day	51% 2 16% 19% 9% 3	4980
	21st to end	Day	54% 2 9% 21% 13% 1	5465
April	1st to 10th	Day	54% 3 11% 19% 13% 1	2357
	11th to 20th	Day	49% 2 10% 23% 15% 1	2454
	21st to end	Day	52% 3 10% 20% 13% 3	2600
May	1st to 10th	Day	50% 3 12% 19% 12% 5%	5897
	11th to 20th	Day	50% 4 12% 19% 14% 2	6266
	21st to end	Day	45% 3 12% 24% 14% 3	6949
June	1st to 10th	Day	42% 4 11% 25% 16% 2	2800
	11th to 20th	Day	39% 5% 13% 27% 16% 1	2800
	21st to end	Day	39% 4 14% 27% 15% 1	2800
July	1st to 10th	Day	36% 6% 14% 27% 15% 2	6290
	11th to 20th	Day	31% 5% 12% 35% 16% 1	6285
	21st to end	Day	31% 6% 14% 30% 18% 1	6267
August	1st to 10th	Day	43% 4 14% 24% 15% 1	4221
	11th to 20th	Day	42% 4 16% 26% 11% 1	4213
	21st to end	Day	34% 5% 12% 37% 11% 1	4492
September	1st to 10th	Day	38% 5% 13% 30% 12% 1	2400
	11th to 20th	Day	34% 3 14% 33% 15% 1	2275
	21st to end	Day	44% 4 14% 27% 10%	2163
October	1st to 10th	Day	37% 4 14% 30% 14% 1	3260
	11th to 20th	Day	39% 4 14% 28% 15%	3240
	21st to end	Day	53% 4 14% 22% 7%	3538
November	1st to 10th	Day	49% 4 13% 24% 10% 1	1783
	11th to 20th	Day	53% 5% 15% 17% 10% 1	1680
	21st to end	Day	60% 4 14% 18% 4	1680
December	1st to 10th	Day	67% 5% 14% 11% 4	2680
	11th to 20th	Day	63% 3 13% 11% 10%	3066
	21st to end	Day	73% 3 7% 11% 6%	4048
January	1st to 10th	Night	55% 4 10% 22% 7% 1	6489
	11th to 20th	Night	66% 3 10% 15% 5%	6107
	21st to end	Night	61% 4 10% 13% 11% 1	6633
February	1st to 10th	Night	58% 3 11% 21% 6% 1	2601
	11th to 20th	Night	59% 3 9% 18% 10% 1	2535
	21st to end	Night	56% 2 12% 21% 9%	2079
March	1st to 10th	Night	53% 3 10% 19% 12% 2	4918
	11th to 20th	Night	44% 2 19% 22% 11% 2	4980
	21st to end	Night	48% 2 8% 21% 19% 3	5467
April	1st to 10th	Night	53% 2 9% 19% 14% 2	2042
	11th to 20th	Night	49% 3 8% 21% 16% 2	1912
	21st to end	Night	47% 3 9% 21% 18% 2	1800
May	1st to 10th	Night	52% 2 11% 15% 14% 6%	4060
	11th to 20th	Night	48% 4 12% 20% 13% 3	3628
	21st to end	Night	41% 2 13% 24% 17% 2	3927
June	1st to 10th	Night	38% 4 10% 27% 18% 3	1600
	11th to 20th	Night	37% 3 11% 26% 21% 2	1600
	21st to end	Night	38% 3 14% 26% 18% 2	1509
July	1st to 10th	Night	32% 5% 15% 24% 22% 2	3560
	11th to 20th	Night	31% 5% 12% 31% 19% 1	3552
	21st to end	Night	30% 5% 13% 29% 22% 1	4266
August	1st to 10th	Night	37% 3 12% 29% 16% 3	2904
	11th to 20th	Night	34% 3 15% 34% 13% 1	2902
	21st to end	Night	34% 4 13% 32% 15% 1	3372
September	1st to 10th	Night	34% 4 14% 32% 15% 2	2000
	11th to 20th	Night	29% 3 11% 38% 19%	2121
	21st to end	Night	43% 3 12% 28% 13% 1	2236
October	1st to 10th	Night	33% 3 8% 30% 24% 1	3920
	11th to 20th	Night	43% 3 12% 29% 13%	3899
	21st to end	Night	41% 4 16% 27% 11% 1	4252
November	1st to 10th	Night	46% 4 11% 26% 13% 1	2727
	11th to 20th	Night	51% 4 14% 21% 10% 1	2940
	21st to end	Night	56% 4 16% 20% 4	2940
December	1st to 10th	Night	64% 4 14% 14% 5%	4720
	11th to 20th	Night	61% 5% 10% 14% 10% 1	5348
	21st to end	Night	71% 4 10% 10% 5%	7150

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	20% 19% 30% 22% 7% 1	220
	11th to 20th	Day	21% 25% 32% 14% 6% 1	308
	21st to end	Day	26% 16% 33% 20% 5%	363
February	1st to 10th	Day	26% 17% 39% 15% 4	300
	11th to 20th	Day	24% 21% 38% 15% 2 1	300
	21st to end	Day	27% 22% 35% 15% 2	264
March	1st to 10th	Day	21% 14% 36% 23% 7%	500
	11th to 20th	Day	20% 17% 33% 21% 7% 1	500
	21st to end	Day	26% 13% 31% 21% 8% 1	550
April	1st to 10th	Day	21% 17% 33% 21% 8% 1	500
	11th to 20th	Day	26% 15% 30% 18% 8% 3	492
	21st to end	Day	23% 12% 33% 21% 9% 2	500
May	1st to 10th	Day	21% 12% 28% 25% 10% 5%	503
	11th to 20th	Day	15% 8% 30% 27% 15% 6%	527
	21st to end	Day	16% 6% 26% 29% 17% 7%	573
June	1st to 10th	Day	14% 9% 30% 30% 14% 3	530
	11th to 20th	Day	14% 7% 27% 30% 18% 3	530
	21st to end	Day	16% 7% 26% 28% 17% 5%	530
July	1st to 10th	Day	9% 5% 22% 34% 22% 9%	525
	11th to 20th	Day	13% 6% 22% 30% 20% 9%	524
	21st to end	Day	8% 3 25% 39% 17% 9%	576
August	1st to 10th	Day	12% 5% 20% 29% 22% 12%	526
	11th to 20th	Day	8% 6% 21% 30% 22% 13%	519
	21st to end	Day	11% 6% 23% 28% 21% 11%	583
September	1st to 10th	Day	14% 6% 22% 28% 18% 12%	530
	11th to 20th	Day	9% 5% 18% 27% 25% 16%	530
	21st to end	Day	14% 8% 29% 25% 16% 7%	530
October	1st to 10th	Day	20% 9% 26% 22% 16% 7%	530
	11th to 20th	Day	18% 15% 35% 22% 7% 2	530
	21st to end	Day	27% 13% 29% 24% 7% 1	583
November	1st to 10th	Day	21% 19% 28% 23% 9% 2	315
	11th to 20th	Day	22% 23% 28% 20% 6% 1	220
	21st to end	Day	25% 15% 39% 17% 3	220
December	1st to 10th	Day	26% 16% 34% 19% 5%	220
	11th to 20th	Day	26% 22% 30% 17% 5%	220
	21st to end	Day	28% 17% 37% 16% 2	242
January	1st to 10th	Night	23% 14% 37% 21% 5%	840
	11th to 20th	Night	28% 13% 30% 24% 4	840
	21st to end	Night	20% 10% 38% 25% 6%	924
February	1st to 10th	Night	21% 13% 38% 25% 3	801
	11th to 20th	Night	22% 12% 37% 24% 4 1	783
	21st to end	Night	19% 12% 39% 25% 4	660
March	1st to 10th	Night	20% 12% 35% 27% 7%	800
	11th to 20th	Night	19% 14% 36% 24% 6% 1	800
	21st to end	Night	21% 10% 32% 28% 9%	880
April	1st to 10th	Night	24% 10% 33% 28% 6%	800
	11th to 20th	Night	19% 11% 34% 26% 9% 2	728
	21st to end	Night	22% 7% 27% 33% 11%	600
May	1st to 10th	Night	19% 6% 26% 33% 15% 2	600
	11th to 20th	Night	16% 4 27% 40% 13% 1	420
	21st to end	Night	12% 3 27% 35% 23%	433
June	1st to 10th	Night	13% 3 26% 40% 18%	400
	11th to 20th	Night	12% 5% 26% 40% 17% 1	400
	21st to end	Night	12% 4 23% 42% 19% 1	400
July	1st to 10th	Night	7% 1 23% 44% 23% 2	390
	11th to 20th	Night	11% 1 23% 40% 23% 2	388
	21st to end	Night	9% 2 18% 44% 25% 2	638
August	1st to 10th	Night	8% 2 13% 43% 31% 3	597
	11th to 20th	Night	9% 2 14% 41% 31% 3	594
	21st to end	Night	11% 2 21% 35% 28% 3	744
September	1st to 10th	Night	11% 5% 23% 34% 23% 5%	800
	11th to 20th	Night	12% 3 16% 33% 31% 5%	800
	21st to end	Night	17% 5% 21% 31% 23% 4	800
October	1st to 10th	Night	17% 5% 26% 28% 21% 3	800
	11th to 20th	Night	21% 8% 30% 30% 11% 1	800
	21st to end	Night	24% 9% 30% 31% 6%	880
November	1st to 10th	Night	21% 10% 28% 29% 11% 1	820
	11th to 20th	Night	21% 11% 35% 24% 8% 2	840
	21st to end	Night	27% 10% 32% 24% 6%	840
December	1st to 10th	Night	26% 11% 36% 22% 5%	840
	11th to 20th	Night	24% 13% 39% 20% 4	840
	21st to end	Night	31% 10% 33% 22% 3	924

Page generated at 2026-01-29 01:21:41. Version ac07

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