Lamping Homestead
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lamping Homestead clear sky chart from 2005-11-06 to 2024-04-03.

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	17% 10% 4 7% 6% 3 5% 5% 5% 7% 32%	78660
	Night	17% 10% 4 7% 6% 3 4 4 5% 6% 34%	81370
Transparency	Day	50% 6% 11% 19% 11% 1	78381
	Night	50% 6% 11% 19% 12% 2	81168
Seeing	Day	23% 13% 26% 21% 12% 4	13950
	Night	21% 10% 25% 28% 14% 2	24297

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	20% 18% 7% 9% 6% 2 3 4 4 5% 20%	2836
	11th to 20th	Day	14% 21% 8% 12% 9% 3 3 3 3 4 19%	2840
	21st to end	Day	24% 20% 7% 10% 7% 3 4 3 3 3 15%	3124
February	1st to 10th	Day	23% 12% 6% 7% 6% 3 4 3 4 5% 26%	1710
	11th to 20th	Day	18% 12% 6% 12% 5% 3 4 3 5% 7% 25%	1729
	21st to end	Day	21% 13% 5% 8% 4 2 3 4 4 5% 30%	1570
March	1st to 10th	Day	18% 10% 5% 7% 5% 2 4 4 4 6% 34%	2072
	11th to 20th	Day	19% 11% 4 7% 5% 4 4 4 5% 7% 31%	2090
	21st to end	Day	21% 10% 4 8% 6% 3 4 4 5% 6% 31%	2299
April	1st to 10th	Day	15% 11% 4 7% 7% 3 5% 4 4 6% 33%	2036
	11th to 20th	Day	17% 8% 3 6% 5% 3 5% 5% 5% 7% 35%	2222
	21st to end	Day	20% 7% 3 6% 6% 3 5% 5% 6% 7% 32%	2340
May	1st to 10th	Day	18% 8% 4 6% 7% 4 5% 5% 5% 7% 30%	2340
	11th to 20th	Day	20% 8% 3 6% 6% 3 4 5% 6% 8% 30%	2301
	21st to end	Day	10% 6% 2 5% 7% 4 6% 6% 7% 9% 37%	2531
June	1st to 10th	Day	13% 5% 3 5% 6% 4 5% 7% 7% 9% 37%	2340
	11th to 20th	Day	13% 6% 3 6% 6% 4 6% 5% 7% 9% 35%	2340
	21st to end	Day	13% 5% 2 5% 5% 4 6% 7% 6% 10% 36%	2340
July	1st to 10th	Day	12% 5% 3 6% 6% 5% 6% 6% 7% 9% 35%	2340
	11th to 20th	Day	11% 6% 3 5% 6% 4 6% 6% 7% 9% 37%	2340
	21st to end	Day	13% 6% 3 6% 6% 4 6% 6% 6% 9% 36%	2547
August	1st to 10th	Day	11% 6% 3 5% 6% 4 7% 7% 8% 11% 33%	2327
	11th to 20th	Day	11% 6% 3 6% 6% 3 6% 7% 8% 10% 34%	2303
	21st to end	Day	10% 5% 2 5% 6% 3 6% 6% 6% 10% 41%	2496
September	1st to 10th	Day	16% 5% 2 4 4 3 3 5% 5% 7% 45%	2066
	11th to 20th	Day	11% 5% 2 4 5% 3 4 5% 6% 8% 48%	1980
	21st to end	Day	18% 8% 3 5% 5% 4 4 4 5% 6% 39%	1980
October	1st to 10th	Day	14% 6% 3 6% 4 3 4 5% 5% 9% 40%	1854
	11th to 20th	Day	17% 8% 2 6% 6% 3 4 4 5% 6% 39%	1800
	21st to end	Day	22% 9% 4 4 5% 2 4 3 4 6% 37%	1980
November	1st to 10th	Day	12% 8% 3 5% 5% 3 4 4 4 5% 48%	1736
	11th to 20th	Day	18% 12% 4 6% 4 2 3 4 6% 7% 35%	1710
	21st to end	Day	18% 11% 4 8% 5% 3 4 4 5% 7% 32%	1587
December	1st to 10th	Day	23% 14% 8% 9% 5% 3 4 4 4 5% 21%	1520
	11th to 20th	Day	19% 16% 6% 10% 6% 2 4 3 5% 6% 23%	1910
	21st to end	Day	23% 19% 6% 8% 6% 4 4 4 5% 5% 15%	3124
January	1st to 10th	Night	17% 18% 7% 10% 7% 3 5% 4 4 4 20%	4109
	11th to 20th	Night	19% 16% 7% 12% 7% 4 5% 3 4 4 19%	4120
	21st to end	Night	28% 15% 6% 10% 7% 3 3 3 3 4 19%	4532
February	1st to 10th	Night	21% 12% 4 8% 6% 3 4 4 4 5% 28%	2470
	11th to 20th	Night	21% 12% 4 9% 6% 4 4 4 4 5% 27%	2332
	21st to end	Night	21% 14% 6% 8% 5% 3 4 5% 3 4 28%	1884
March	1st to 10th	Night	18% 10% 4 6% 6% 2 4 4 4 6% 36%	2106
	11th to 20th	Night	18% 9% 4 7% 6% 3 4 4 5% 6% 34%	2090
	21st to end	Night	21% 9% 4 7% 5% 3 3 3 4 6% 36%	2299
April	1st to 10th	Night	18% 8% 3 6% 5% 3 4 4 5% 7% 37%	1967
	11th to 20th	Night	16% 7% 3 4 6% 3 4 5% 6% 8% 38%	1701
	21st to end	Night	17% 8% 3 7% 5% 3 5% 4 5% 8% 37%	1620
May	1st to 10th	Night	17% 7% 2 7% 6% 3 6% 6% 7% 7% 33%	1620
	11th to 20th	Night	17% 7% 3 6% 6% 3 5% 5% 5% 8% 36%	1592
	21st to end	Night	9% 5% 3 6% 6% 2 5% 5% 7% 12% 41%	1744
June	1st to 10th	Night	10% 6% 3 5% 5% 3 5% 5% 5% 8% 45%	1620
	11th to 20th	Night	11% 6% 2 5% 6% 2 5% 6% 6% 11% 40%	1524
	21st to end	Night	12% 4 2 4 5% 3 4 5% 6% 10% 46%	1620
July	1st to 10th	Night	9% 6% 3 6% 5% 3 5% 6% 6% 9% 43%	1620
	11th to 20th	Night	9% 4 2 5% 5% 4 4 5% 6% 10% 48%	1620
	21st to end	Night	10% 5% 2 5% 5% 3 5% 5% 7% 10% 42%	1771
August	1st to 10th	Night	6% 5% 2 5% 7% 3 6% 6% 7% 10% 42%	1611
	11th to 20th	Night	8% 6% 3 6% 6% 3 5% 6% 6% 8% 43%	1598
	21st to end	Night	9% 4 2 4 4 3 5% 5% 6% 9% 49%	1840
September	1st to 10th	Night	12% 4 2 4 5% 3 4 4 6% 6% 50%	1890
	11th to 20th	Night	9% 5% 2 4 4 2 4 4 5% 7% 54%	1980
	21st to end	Night	14% 6% 3 6% 5% 2 4 5% 4 7% 43%	1980
October	1st to 10th	Night	13% 5% 2 6% 5% 3 4 4 5% 7% 45%	2106
	11th to 20th	Night	16% 8% 2 5% 4 3 4 4 5% 7% 42%	2160
	21st to end	Night	23% 7% 2 5% 6% 2 3 4 4 6% 38%	2376
November	1st to 10th	Night	13% 8% 3 5% 4 2 3 3 5% 6% 48%	2338
	11th to 20th	Night	17% 10% 3 6% 5% 4 5% 5% 4 6% 35%	2470
	21st to end	Night	19% 10% 4 7% 6% 3 5% 4 5% 5% 32%	2588
December	1st to 10th	Night	23% 14% 6% 9% 6% 3 4 4 4 5% 24%	2660
	11th to 20th	Night	18% 15% 7% 8% 5% 3 4 4 5% 6% 26%	3280
	21st to end	Night	22% 18% 5% 8% 6% 4 5% 4 4 5% 19%	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	66% 5% 11% 12% 6%	2837
	11th to 20th	Day	71% 3 9% 11% 5%	2840
	21st to end	Day	74% 4 6% 12% 3 1	3124
February	1st to 10th	Day	61% 4 11% 15% 8% 1	1710
	11th to 20th	Day	59% 5% 9% 16% 10%	1738
	21st to end	Day	58% 3 10% 17% 9% 2	1570
March	1st to 10th	Day	51% 4 11% 23% 10% 1	2072
	11th to 20th	Day	53% 5% 10% 20% 11% 2	2090
	21st to end	Day	54% 6% 9% 17% 12% 2	2299
April	1st to 10th	Day	52% 6% 10% 17% 12% 3	2036
	11th to 20th	Day	48% 6% 11% 15% 17% 3	2222
	21st to end	Day	50% 7% 10% 19% 12% 2	2340
May	1st to 10th	Day	52% 6% 12% 20% 9% 2	2340
	11th to 20th	Day	51% 7% 12% 16% 11% 2	2305
	21st to end	Day	40% 10% 16% 22% 11% 1	2531
June	1st to 10th	Day	41% 9% 13% 22% 14% 1	2340
	11th to 20th	Day	42% 9% 14% 21% 12% 1	2340
	21st to end	Day	40% 10% 14% 21% 13% 1	2340
July	1st to 10th	Day	43% 9% 12% 19% 15% 2	2275
	11th to 20th	Day	40% 9% 12% 23% 15% 2	2271
	21st to end	Day	42% 9% 12% 23% 12% 2	2405
August	1st to 10th	Day	40% 10% 15% 23% 11% 1	2314
	11th to 20th	Day	40% 9% 14% 26% 11% 1	2303
	21st to end	Day	37% 8% 14% 23% 14% 4	2496
September	1st to 10th	Day	38% 6% 10% 22% 20% 4	2066
	11th to 20th	Day	34% 6% 13% 29% 16% 2	1980
	21st to end	Day	44% 5% 11% 21% 18% 1	1980
October	1st to 10th	Day	40% 7% 13% 22% 17% 1	1854
	11th to 20th	Day	45% 5% 11% 24% 14%	1800
	21st to end	Day	49% 4 10% 22% 13% 1	1980
November	1st to 10th	Day	39% 4 10% 27% 16% 3	1736
	11th to 20th	Day	49% 5% 10% 21% 13% 3	1710
	21st to end	Day	52% 5% 11% 19% 11% 1	1587
December	1st to 10th	Day	66% 5% 10% 16% 4	1520
	11th to 20th	Day	62% 5% 9% 18% 5%	1906
	21st to end	Day	68% 7% 11% 10% 4	3124
January	1st to 10th	Night	67% 5% 9% 13% 5%	4109
	11th to 20th	Night	69% 5% 10% 12% 4	4120
	21st to end	Night	71% 4 7% 14% 3 1	4532
February	1st to 10th	Night	59% 5% 10% 16% 9% 1	2470
	11th to 20th	Night	61% 4 9% 17% 9%	2334
	21st to end	Night	60% 4 8% 16% 8% 2	1884
March	1st to 10th	Night	50% 5% 8% 23% 13% 1	2106
	11th to 20th	Night	51% 4 11% 22% 11% 1	2090
	21st to end	Night	51% 4 8% 21% 12% 4	2299
April	1st to 10th	Night	49% 4 10% 21% 14% 2	1967
	11th to 20th	Night	42% 7% 12% 19% 16% 5%	1701
	21st to end	Night	45% 6% 12% 20% 15% 2	1620
May	1st to 10th	Night	48% 9% 12% 17% 10% 4	1620
	11th to 20th	Night	46% 7% 12% 19% 13% 3	1593
	21st to end	Night	36% 9% 17% 24% 13% 1	1745
June	1st to 10th	Night	37% 8% 11% 25% 17% 2	1620
	11th to 20th	Night	37% 9% 14% 22% 15% 3	1524
	21st to end	Night	33% 9% 15% 24% 17% 2	1620
July	1st to 10th	Night	37% 10% 13% 21% 17% 3	1575
	11th to 20th	Night	31% 8% 16% 23% 18% 3	1566
	21st to end	Night	34% 10% 17% 22% 16% 1	1672
August	1st to 10th	Night	34% 9% 16% 25% 14% 1	1600
	11th to 20th	Night	37% 7% 14% 24% 16% 2	1598
	21st to end	Night	31% 8% 13% 27% 16% 5%	1840
September	1st to 10th	Night	34% 7% 13% 18% 20% 7%	1890
	11th to 20th	Night	30% 5% 14% 26% 23% 2	1980
	21st to end	Night	41% 6% 11% 21% 20% 2	1980
October	1st to 10th	Night	37% 6% 11% 25% 17% 3	2106
	11th to 20th	Night	42% 5% 9% 24% 17% 2	2160
	21st to end	Night	48% 4 8% 23% 14% 2	2376
November	1st to 10th	Night	39% 3 11% 23% 19% 4	2338
	11th to 20th	Night	50% 5% 8% 20% 15% 2	2470
	21st to end	Night	54% 5% 10% 20% 10% 1	2588
December	1st to 10th	Night	64% 4 9% 17% 5% 1	2660
	11th to 20th	Night	60% 4 13% 17% 6%	3283
	21st to end	Night	66% 6% 9% 14% 5%	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	33% 23% 30% 10% 4 1	270
	11th to 20th	Day	37% 23% 30% 9% 1	270
	21st to end	Day	36% 26% 26% 9% 2 1	297
February	1st to 10th	Day	38% 19% 30% 11% 2	270
	11th to 20th	Day	40% 26% 28% 5% 1 1	270
	21st to end	Day	37% 20% 34% 8%	225
March	1st to 10th	Day	31% 20% 28% 17% 4	442
	11th to 20th	Day	33% 16% 33% 12% 6% 1	460
	21st to end	Day	32% 17% 33% 14% 4	506
April	1st to 10th	Day	27% 18% 31% 16% 7% 1	428
	11th to 20th	Day	27% 17% 26% 19% 8% 3	412
	21st to end	Day	30% 18% 26% 16% 8% 2	420
May	1st to 10th	Day	29% 19% 24% 16% 10% 3	423
	11th to 20th	Day	22% 11% 30% 21% 12% 3	447
	21st to end	Day	14% 9% 26% 28% 18% 6%	485
June	1st to 10th	Day	15% 7% 29% 29% 15% 5%	450
	11th to 20th	Day	17% 11% 24% 29% 14% 6%	450
	21st to end	Day	14% 7% 31% 28% 16% 5%	450
July	1st to 10th	Day	14% 5% 18% 27% 20% 15%	445
	11th to 20th	Day	11% 4 24% 30% 20% 11%	444
	21st to end	Day	17% 5% 21% 27% 21% 9%	488
August	1st to 10th	Day	12% 5% 21% 29% 24% 10%	446
	11th to 20th	Day	15% 5% 20% 29% 19% 12%	439
	21st to end	Day	12% 5% 21% 28% 21% 13%	495
September	1st to 10th	Day	17% 6% 18% 27% 22% 9%	450
	11th to 20th	Day	12% 3 17% 27% 30% 11%	450
	21st to end	Day	23% 9% 23% 24% 18% 3	450
October	1st to 10th	Day	15% 8% 26% 29% 19% 4	450
	11th to 20th	Day	23% 12% 27% 25% 11% 1	450
	21st to end	Day	29% 15% 29% 18% 9%	495
November	1st to 10th	Day	23% 14% 30% 20% 9% 4	334
	11th to 20th	Day	29% 17% 28% 19% 7% 1	270
	21st to end	Day	25% 20% 37% 16% 1 1	212
December	1st to 10th	Day	32% 20% 30% 12% 5% 1	180
	11th to 20th	Day	29% 24% 29% 12% 4 1	180
	21st to end	Day	35% 21% 25% 13% 6%	297
January	1st to 10th	Night	29% 19% 31% 17% 4	760
	11th to 20th	Night	32% 18% 28% 19% 3	760
	21st to end	Night	29% 17% 32% 20% 2	836
February	1st to 10th	Night	29% 14% 30% 25% 2	760
	11th to 20th	Night	31% 18% 34% 16% 1	743
	21st to end	Night	30% 18% 31% 18% 2	628
March	1st to 10th	Night	25% 16% 30% 25% 4	760
	11th to 20th	Night	27% 16% 28% 22% 6% 1	760
	21st to end	Night	27% 15% 31% 21% 5% 1	836
April	1st to 10th	Night	25% 15% 31% 23% 7%	729
	11th to 20th	Night	21% 14% 31% 25% 9% 1	637
	21st to end	Night	19% 10% 36% 27% 7% 1	540
May	1st to 10th	Night	19% 10% 29% 28% 13% 1	540
	11th to 20th	Night	19% 7% 27% 33% 14% 1	531
	21st to end	Night	12% 4 22% 35% 24% 4	584
June	1st to 10th	Night	14% 4 21% 40% 20% 1	540
	11th to 20th	Night	14% 5% 21% 36% 22% 2	444
	21st to end	Night	14% 2 20% 37% 25% 1	540
July	1st to 10th	Night	11% 3 17% 35% 27% 6%	525
	11th to 20th	Night	7% 4 18% 35% 31% 6%	522
	21st to end	Night	13% 3 14% 34% 33% 4	591
August	1st to 10th	Night	9% 1 12% 41% 33% 3	537
	11th to 20th	Night	13% 2 15% 35% 30% 5%	534
	21st to end	Night	12% 2 17% 33% 30% 7%	652
September	1st to 10th	Night	15% 3 17% 32% 28% 6%	720
	11th to 20th	Night	11% 3 17% 30% 34% 4	720
	21st to end	Night	17% 6% 20% 32% 21% 4	720
October	1st to 10th	Night	15% 5% 22% 30% 25% 2	720
	11th to 20th	Night	21% 9% 26% 30% 12% 1	720
	21st to end	Night	26% 12% 22% 30% 10% 1	792
November	1st to 10th	Night	17% 10% 25% 31% 16%	740
	11th to 20th	Night	25% 14% 26% 25% 8% 1	760
	21st to end	Night	26% 12% 29% 26% 7% 1	760
December	1st to 10th	Night	32% 14% 27% 22% 4	760
	11th to 20th	Night	27% 16% 28% 24% 5%	760
	21st to end	Night	30% 15% 28% 25% 2	836

Page generated at 2024-03-31 06:08:53. Version ac07

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