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 2024-11-04.

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	16% 10% 3 7% 5% 4 5% 4 6% 7% 33%	100676
	Night	16% 10% 3 8% 5% 4 4 3 5% 6% 35%	98181
Transparency	Day	47% 6% 11% 21% 13% 2	104364
	Night	48% 6% 10% 21% 13% 2	102632
Seeing	Day	23% 13% 26% 21% 12% 4	14810
	Night	21% 10% 25% 28% 14% 2	25020

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% 19% 6% 10% 5% 3 3 3 4 5% 20%	2836
	11th to 20th	Day	14% 21% 8% 13% 8% 4 3 2 3 4 19%	2840
	21st to end	Day	24% 21% 6% 11% 5% 4 3 2 3 3 15%	3124
February	1st to 10th	Day	22% 14% 5% 8% 6% 4 4 3 4 5% 26%	1710
	11th to 20th	Day	17% 13% 5% 12% 5% 4 3 3 5% 7% 25%	1729
	21st to end	Day	21% 14% 5% 8% 4 3 3 3 4 5% 30%	1570
March	1st to 10th	Day	22% 16% 4 8% 4 3 3 3 4 5% 28%	3417
	11th to 20th	Day	15% 8% 3 7% 4 5% 5% 4 5% 7% 38%	3480
	21st to end	Day	21% 9% 3 7% 4 4 5% 3 6% 6% 31%	3815
April	1st to 10th	Day	15% 13% 4 9% 6% 5% 5% 3 5% 6% 32%	2126
	11th to 20th	Day	17% 9% 3 7% 4 4 5% 4 5% 6% 36%	2348
	21st to end	Day	19% 8% 3 7% 5% 4 5% 4 6% 7% 32%	2470
May	1st to 10th	Day	21% 10% 4 8% 5% 5% 5% 4 5% 6% 27%	4082
	11th to 20th	Day	19% 10% 3 7% 4 4 4 3 6% 7% 32%	4081
	21st to end	Day	11% 6% 2 7% 6% 5% 6% 4 7% 10% 36%	4476
June	1st to 10th	Day	13% 6% 2 6% 5% 5% 5% 5% 7% 9% 37%	2470
	11th to 20th	Day	12% 6% 3 7% 5% 6% 6% 5% 7% 9% 36%	2470
	21st to end	Day	13% 6% 2 6% 4 5% 5% 5% 6% 10% 37%	2470
July	1st to 10th	Day	9% 6% 2 7% 5% 5% 6% 5% 7% 9% 39%	4120
	11th to 20th	Day	9% 6% 2 6% 5% 4 5% 4 7% 9% 42%	4120
	21st to end	Day	14% 9% 3 7% 5% 5% 5% 4 6% 8% 33%	4466
August	1st to 10th	Day	10% 7% 3 7% 5% 6% 6% 5% 7% 11% 33%	4104
	11th to 20th	Day	9% 6% 3 7% 5% 5% 6% 5% 7% 9% 38%	4044
	21st to end	Day	6% 3 2 5% 5% 4 6% 5% 7% 10% 47%	4384
September	1st to 10th	Day	15% 5% 2 4 4 3 4 3 5% 7% 47%	2180
	11th to 20th	Day	11% 6% 2 5% 4 4 4 4 6% 8% 48%	2090
	21st to end	Day	20% 8% 3 6% 4 4 4 3 5% 6% 38%	2090
October	1st to 10th	Day	14% 6% 3 6% 4 4 4 4 6% 8% 42%	1957
	11th to 20th	Day	16% 8% 2 7% 5% 4 4 3 5% 5% 40%	1900
	21st to end	Day	21% 10% 3 5% 4 3 3 2 4 6% 39%	2090
November	1st to 10th	Day	11% 8% 2 6% 4 4 3 3 4 5% 49%	1766
	11th to 20th	Day	17% 14% 3 6% 4 3 3 3 6% 7% 34%	1710
	21st to end	Day	18% 12% 3 9% 4 4 4 3 5% 7% 32%	1587
December	1st to 10th	Day	23% 15% 7% 9% 5% 3 4 3 4 5% 21%	1520
	11th to 20th	Day	19% 16% 5% 11% 5% 4 3 3 5% 6% 23%	1910
	21st to end	Day	23% 20% 5% 9% 5% 5% 5% 3 5% 5% 15%	3124
January	1st to 10th	Night	16% 19% 7% 11% 6% 4 4 4 4 4 20%	4109
	11th to 20th	Night	19% 17% 6% 14% 6% 5% 5% 2 4 4 19%	4120
	21st to end	Night	28% 16% 6% 12% 5% 4 2 2 3 3 19%	4532
February	1st to 10th	Night	21% 13% 3 9% 5% 4 4 4 4 5% 28%	2470
	11th to 20th	Night	21% 13% 4 10% 5% 5% 4 3 4 5% 27%	2332
	21st to end	Night	21% 15% 5% 8% 4 4 4 4 3 4 27%	1884
March	1st to 10th	Night	22% 12% 3 7% 4 4 3 3 4 6% 32%	3434
	11th to 20th	Night	13% 10% 4 8% 5% 4 4 3 6% 6% 36%	3480
	21st to end	Night	18% 9% 3 7% 4 3 3 2 4 6% 41%	3817
April	1st to 10th	Night	17% 10% 3 6% 5% 4 4 3 5% 6% 36%	2052
	11th to 20th	Night	16% 7% 3 5% 5% 4 4 5% 6% 8% 38%	1796
	21st to end	Night	16% 8% 3 7% 4 4 5% 3 5% 8% 37%	1710
May	1st to 10th	Night	27% 10% 3 8% 4 3 5% 3 5% 5% 26%	2813
	11th to 20th	Night	18% 8% 3 7% 5% 5% 4 3 4 6% 38%	2812
	21st to end	Night	11% 7% 2 7% 4 3 4 4 7% 10% 40%	3079
June	1st to 10th	Night	10% 7% 3 6% 5% 4 4 3 6% 9% 44%	1710
	11th to 20th	Night	10% 6% 2 6% 6% 4 5% 4 7% 11% 41%	1609
	21st to end	Night	12% 5% 1 5% 4 4 4 4 7% 10% 45%	1710
July	1st to 10th	Night	9% 7% 3 7% 4 4 5% 4 6% 8% 42%	2840
	11th to 20th	Night	10% 5% 2 6% 5% 5% 4 3 7% 9% 44%	2840
	21st to end	Night	10% 7% 3 7% 6% 5% 5% 4 7% 8% 39%	3087
August	1st to 10th	Night	9% 8% 3 8% 5% 5% 5% 4 7% 10% 35%	2825
	11th to 20th	Night	11% 7% 4 7% 5% 4 4 4 5% 7% 42%	2785
	21st to end	Night	6% 4 2 6% 4 5% 6% 5% 6% 10% 47%	3238
September	1st to 10th	Night	12% 5% 2 5% 3 4 4 3 6% 6% 51%	1995
	11th to 20th	Night	9% 5% 2 5% 3 3 3 4 5% 7% 54%	2090
	21st to end	Night	15% 7% 3 7% 5% 4 4 4 4 7% 42%	2090
October	1st to 10th	Night	12% 5% 2 6% 4 4 4 3 5% 7% 46%	2223
	11th to 20th	Night	15% 8% 2 6% 4 4 4 3 5% 6% 43%	2280
	21st to end	Night	22% 7% 2 6% 4 3 4 3 4 6% 40%	2508
November	1st to 10th	Night	13% 8% 3 5% 4 3 3 3 5% 6% 48%	2381
	11th to 20th	Night	17% 11% 3 7% 4 5% 5% 4 5% 6% 34%	2470
	21st to end	Night	19% 11% 3 8% 5% 4 4 3 5% 5% 32%	2588
December	1st to 10th	Night	22% 15% 5% 9% 5% 4 4 3 4 4 23%	2660
	11th to 20th	Night	18% 16% 6% 9% 5% 4 4 3 5% 5% 26%	3280
	21st to end	Night	21% 19% 5% 9% 6% 5% 5% 3 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	58% 5% 10% 20% 7%	3417
	11th to 20th	Day	44% 6% 11% 27% 11% 1	3480
	21st to end	Day	50% 6% 9% 21% 13% 1	3815
April	1st to 10th	Day	52% 6% 10% 17% 12% 3	2126
	11th to 20th	Day	47% 6% 11% 16% 17% 3	2348
	21st to end	Day	49% 7% 10% 20% 12% 2	2470
May	1st to 10th	Day	55% 6% 10% 20% 8% 1	4120
	11th to 20th	Day	49% 7% 11% 20% 12% 1	4085
	21st to end	Day	39% 9% 16% 19% 13% 4	4489
June	1st to 10th	Day	40% 9% 13% 22% 14% 1	2470
	11th to 20th	Day	42% 9% 14% 22% 13% 1	2470
	21st to end	Day	40% 9% 14% 22% 14% 1	2470
July	1st to 10th	Day	39% 8% 12% 23% 16% 3	4055
	11th to 20th	Day	35% 8% 11% 29% 16% 1	4051
	21st to end	Day	47% 7% 10% 18% 16% 3	4324
August	1st to 10th	Day	41% 9% 13% 25% 11%	4091
	11th to 20th	Day	37% 9% 11% 29% 13%	4083
	21st to end	Day	30% 8% 15% 27% 18% 2	4384
September	1st to 10th	Day	36% 6% 10% 22% 22% 4	2180
	11th to 20th	Day	34% 6% 12% 29% 17% 3	2090
	21st to end	Day	46% 5% 11% 20% 17% 1	2090
October	1st to 10th	Day	28% 6% 9% 28% 27% 2	3256
	11th to 20th	Day	36% 6% 13% 24% 16% 5%	3140
	21st to end	Day	33% 4 12% 28% 21% 2	3428
November	1st to 10th	Day	39% 4 10% 28% 16% 3	1766
	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	53% 5% 7% 22% 12% 1	3434
	11th to 20th	Night	46% 6% 11% 28% 9% 1	3480
	21st to end	Night	45% 5% 8% 28% 13% 2	3817
April	1st to 10th	Night	49% 5% 10% 20% 14% 2	2052
	11th to 20th	Night	42% 7% 12% 19% 16% 5%	1796
	21st to end	Night	44% 6% 12% 20% 15% 2	1710
May	1st to 10th	Night	57% 8% 9% 15% 8% 2	2840
	11th to 20th	Night	45% 7% 11% 24% 12% 2	2813
	21st to end	Night	36% 10% 14% 23% 13% 4	3087
June	1st to 10th	Night	38% 8% 11% 24% 17% 2	1710
	11th to 20th	Night	36% 9% 14% 22% 15% 3	1609
	21st to end	Night	34% 9% 15% 23% 17% 2	1710
July	1st to 10th	Night	39% 7% 10% 23% 17% 4	2795
	11th to 20th	Night	34% 8% 13% 28% 15% 2	2786
	21st to end	Night	39% 10% 12% 17% 17% 4	2988
August	1st to 10th	Night	42% 9% 15% 24% 10% 1	2814
	11th to 20th	Night	39% 6% 10% 24% 19% 1	2812
	21st to end	Night	30% 8% 12% 30% 17% 3	3238
September	1st to 10th	Night	34% 6% 13% 18% 22% 7%	1995
	11th to 20th	Night	30% 5% 14% 25% 24% 2	2090
	21st to end	Night	42% 6% 10% 21% 19% 2	2090
October	1st to 10th	Night	30% 5% 8% 29% 24% 4	3704
	11th to 20th	Night	33% 5% 12% 23% 20% 8%	3779
	21st to end	Night	33% 3 7% 27% 26% 3	4120
November	1st to 10th	Night	39% 3 11% 23% 19% 4	2381
	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	460
	11th to 20th	Day	28% 17% 26% 18% 8% 3	452
	21st to end	Day	28% 18% 27% 17% 8% 2	460
May	1st to 10th	Day	28% 19% 25% 16% 10% 3	463
	11th to 20th	Day	21% 12% 30% 21% 12% 4	487
	21st to end	Day	13% 10% 26% 27% 18% 5%	529
June	1st to 10th	Day	15% 8% 29% 28% 15% 5%	490
	11th to 20th	Day	16% 10% 23% 30% 15% 5%	490
	21st to end	Day	13% 7% 32% 27% 16% 4	490
July	1st to 10th	Day	13% 6% 21% 27% 19% 14%	485
	11th to 20th	Day	11% 5% 25% 29% 20% 10%	484
	21st to end	Day	17% 5% 22% 28% 20% 8%	532
August	1st to 10th	Day	12% 5% 23% 28% 22% 9%	486
	11th to 20th	Day	15% 5% 21% 30% 18% 11%	479
	21st to end	Day	11% 4 20% 29% 22% 12%	539
September	1st to 10th	Day	16% 6% 19% 28% 22% 9%	490
	11th to 20th	Day	11% 4 16% 27% 31% 11%	490
	21st to end	Day	25% 9% 22% 24% 17% 3	490
October	1st to 10th	Day	14% 8% 26% 28% 19% 4	490
	11th to 20th	Day	23% 12% 27% 25% 12% 2	490
	21st to end	Day	27% 14% 30% 19% 10% 1	539
November	1st to 10th	Day	22% 14% 30% 21% 9% 3	346
	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	24% 15% 32% 23% 6%	760
	11th to 20th	Night	21% 14% 32% 24% 9% 1	672
	21st to end	Night	19% 10% 36% 29% 6% 1	570
May	1st to 10th	Night	19% 11% 28% 28% 13% 1	570
	11th to 20th	Night	18% 7% 27% 32% 16% 1	561
	21st to end	Night	12% 4 22% 35% 24% 4	617
June	1st to 10th	Night	14% 5% 22% 39% 20% 1	570
	11th to 20th	Night	13% 5% 20% 37% 23% 2	469
	21st to end	Night	13% 3 21% 37% 25% 1	570
July	1st to 10th	Night	11% 4 18% 35% 26% 6%	555
	11th to 20th	Night	7% 4 18% 36% 29% 5%	552
	21st to end	Night	12% 4 14% 34% 33% 3	624
August	1st to 10th	Night	9% 2 14% 40% 32% 3	567
	11th to 20th	Night	12% 3 16% 35% 29% 5%	564
	21st to end	Night	11% 2 16% 34% 31% 7%	689
September	1st to 10th	Night	14% 3 17% 33% 27% 6%	760
	11th to 20th	Night	11% 3 17% 32% 33% 4	760
	21st to end	Night	18% 6% 21% 32% 20% 4	760
October	1st to 10th	Night	15% 5% 22% 30% 25% 2	760
	11th to 20th	Night	20% 9% 26% 30% 13% 1	760
	21st to end	Night	25% 12% 22% 30% 11% 1	836
November	1st to 10th	Night	17% 10% 25% 31% 17%	755
	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 2024-11-01 22:47:37. Version ac07

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