Lantham Spings Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lantham Spings Camp clear sky chart from 2005-11-06 to 2024-11-06.

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	11% 5% 2 5% 3 4 4 3 5% 7% 51%	101097
	Night	11% 5% 2 4 3 3 3 3 4 6% 55%	98068
Transparency	Day	31% 5% 10% 23% 22% 9%	104866
	Night	29% 4 9% 22% 23% 12%	102426
Seeing	Day	12% 6% 21% 28% 24% 9%	15042
	Night	13% 7% 27% 36% 17% 2	24904

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	12% 6% 1 5% 4 3 2 2 3 5% 57%	2847
	11th to 20th	Day	14% 5% 1 3 1 2 3 2 4 6% 58%	2850
	21st to end	Day	21% 8% 3 6% 2 2 2 2 3 4 47%	3135
February	1st to 10th	Day	16% 8% 3 7% 3 3 2 3 3 5% 47%	1895
	11th to 20th	Day	15% 10% 3 6% 3 3 3 2 4 5% 47%	1849
	21st to end	Day	20% 6% 2 4 3 2 3 2 4 5% 50%	1579
March	1st to 10th	Day	16% 6% 2 5% 4 3 4 2 5% 7% 46%	3436
	11th to 20th	Day	19% 6% 2 7% 5% 4 5% 3 4 6% 39%	3480
	21st to end	Day	11% 7% 2 7% 4 4 4 4 6% 7% 44%	3814
April	1st to 10th	Day	14% 6% 2 5% 4 3 4 4 5% 7% 46%	2090
	11th to 20th	Day	13% 7% 3 6% 4 4 5% 3 6% 6% 44%	2116
	21st to end	Day	13% 5% 2 5% 4 4 4 3 4 6% 49%	2426
May	1st to 10th	Day	19% 7% 3 7% 5% 4 3 4 6% 7% 36%	4082
	11th to 20th	Day	15% 6% 2 6% 3 3 3 4 5% 6% 47%	4082
	21st to end	Day	13% 6% 2 7% 5% 5% 6% 5% 7% 9% 36%	4477
June	1st to 10th	Day	5% 3 1 4 4 5% 5% 4 5% 9% 54%	2470
	11th to 20th	Day	5% 4 2 5% 4 4 5% 4 7% 9% 53%	2470
	21st to end	Day	5% 4 1 4 4 5% 4 4 7% 8% 53%	2470
July	1st to 10th	Day	6% 4 2 5% 4 4 5% 4 7% 8% 52%	4120
	11th to 20th	Day	3 2 1 4 3 3 4 4 5% 9% 62%	4120
	21st to end	Day	7% 7% 2 5% 4 5% 5% 5% 7% 10% 42%	4465
August	1st to 10th	Day	1 1 2 2 2 3 3 5% 8% 73%	4104
	11th to 20th	Day	4 2 1 2 2 3 3 3 5% 8% 67%	4017
	21st to end	Day	3 2 1 3 3 4 4 4 7% 11% 57%	3961
September	1st to 10th	Day	9% 5% 2 5% 4 4 4 4 6% 6% 51%	2090
	11th to 20th	Day	10% 4 2 6% 4 4 5% 4 5% 8% 48%	2090
	21st to end	Day	6% 4 1 4 2 3 4 4 6% 8% 57%	2090
October	1st to 10th	Day	5% 3 1 4 3 3 3 3 5% 7% 63%	2076
	11th to 20th	Day	11% 4 1 4 2 3 3 2 4 5% 61%	1900
	21st to end	Day	14% 4 1 3 3 3 2 2 3 4 62%	2090
November	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 4 6% 52%	1908
	11th to 20th	Day	8% 4 1 5% 4 4 3 3 5% 7% 56%	1782
	21st to end	Day	16% 7% 3 5% 3 2 3 2 3 5% 51%	1710
December	1st to 10th	Day	15% 5% 2 4 3 3 3 3 4 5% 52%	1710
	11th to 20th	Day	16% 7% 2 7% 4 3 4 3 3 6% 46%	2161
	21st to end	Day	17% 6% 2 5% 3 3 3 3 4 4 52%	3135
January	1st to 10th	Night	16% 4 1 3 3 2 3 2 3 4 59%	4108
	11th to 20th	Night	13% 4 1 3 2 2 2 2 3 3 64%	4120
	21st to end	Night	19% 7% 3 5% 3 3 3 2 3 5% 47%	4532
February	1st to 10th	Night	16% 7% 2 5% 4 3 3 2 4 5% 50%	2299
	11th to 20th	Night	17% 6% 2 5% 3 3 2 2 4 6% 49%	2218
	21st to end	Night	19% 6% 2 3 3 2 2 3 3 5% 53%	1873
March	1st to 10th	Night	14% 7% 2 7% 5% 5% 4 3 5% 6% 44%	3419
	11th to 20th	Night	17% 5% 2 6% 4 4 4 3 5% 7% 42%	3480
	21st to end	Night	12% 6% 2 6% 4 4 4 3 4 6% 49%	3817
April	1st to 10th	Night	11% 5% 2 4 3 3 3 3 5% 7% 53%	2090
	11th to 20th	Night	13% 5% 2 5% 4 4 4 4 5% 5% 50%	2012
	21st to end	Night	12% 5% 2 5% 3 3 4 3 5% 7% 51%	1749
May	1st to 10th	Night	22% 7% 2 5% 4 3 3 3 4 7% 41%	2823
	11th to 20th	Night	11% 6% 2 6% 4 4 3 3 5% 7% 49%	2823
	21st to end	Night	12% 5% 2 5% 4 4 4 4 6% 9% 46%	3090
June	1st to 10th	Night	3 3 1 4 2 4 4 4 5% 10% 60%	1710
	11th to 20th	Night	4 3 1 3 3 3 3 3 6% 8% 63%	1710
	21st to end	Night	3 4 1 4 4 3 4 4 6% 8% 59%	1710
July	1st to 10th	Night	4 3 1 4 3 3 3 3 5% 9% 62%	2850
	11th to 20th	Night	2 2 1 3 2 3 3 3 5% 9% 68%	2850
	21st to end	Night	5% 5% 2 6% 4 4 4 5% 7% 10% 49%	3098
August	1st to 10th	Night	1 1 1 1 1 1 1 4 8% 81%	2836
	11th to 20th	Night	3 2 1 3 2 2 3 3 5% 12% 64%	2817
	21st to end	Night	3 2 1 3 3 3 4 4 7% 9% 63%	3699
September	1st to 10th	Night	7% 4 2 5% 3 4 3 3 6% 8% 55%	2090
	11th to 20th	Night	10% 5% 3 5% 3 2 3 3 5% 7% 54%	2090
	21st to end	Night	7% 3 1 4 2 3 3 3 4 7% 63%	2090
October	1st to 10th	Night	5% 3 1 3 2 2 3 3 5% 6% 67%	2090
	11th to 20th	Night	12% 3 1 3 3 3 3 2 3 5% 62%	2273
	21st to end	Night	14% 4 2 3 2 2 2 2 3 4 62%	2508
November	1st to 10th	Night	11% 5% 2 4 2 3 2 3 3 4 61%	2292
	11th to 20th	Night	7% 5% 2 5% 4 3 3 3 5% 7% 57%	2394
	21st to end	Night	17% 5% 1 5% 4 3 3 2 3 5% 52%	2470
December	1st to 10th	Night	13% 5% 1 4 3 3 3 3 5% 6% 55%	2470
	11th to 20th	Night	13% 6% 2 6% 4 3 3 3 4 5% 49%	3036
	21st to end	Night	17% 6% 2 4 2 2 2 2 3 4 55%	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	32% 4 4 19% 31% 10%	2848
	11th to 20th	Day	29% 3 6% 21% 29% 12%	2850
	21st to end	Day	44% 3 4 16% 23% 11%	3135
February	1st to 10th	Day	41% 4 4 16% 22% 13%	1895
	11th to 20th	Day	41% 3 6% 17% 22% 11%	1859
	21st to end	Day	39% 3 4 15% 21% 17%	1579
March	1st to 10th	Day	39% 5% 6% 15% 24% 11%	3436
	11th to 20th	Day	46% 6% 10% 14% 17% 6%	3480
	21st to end	Day	38% 6% 10% 19% 19% 7%	3814
April	1st to 10th	Day	38% 6% 9% 18% 17% 12%	2090
	11th to 20th	Day	41% 5% 7% 17% 21% 9%	2116
	21st to end	Day	36% 5% 7% 19% 26% 7%	2426
May	1st to 10th	Day	47% 7% 9% 21% 13% 4	4120
	11th to 20th	Day	38% 5% 7% 20% 27% 2	4086
	21st to end	Day	41% 10% 12% 21% 12% 4	4489
June	1st to 10th	Day	26% 8% 14% 28% 20% 4	2470
	11th to 20th	Day	27% 5% 13% 29% 19% 7%	2470
	21st to end	Day	27% 7% 13% 26% 23% 5%	2470
July	1st to 10th	Day	28% 7% 17% 36% 11% 1	4056
	11th to 20th	Day	20% 5% 13% 39% 19% 4	4051
	21st to end	Day	33% 7% 15% 30% 15%	4325
August	1st to 10th	Day	10% 5% 10% 35% 37% 3	4090
	11th to 20th	Day	16% 5% 16% 39% 21% 2	4056
	21st to end	Day	20% 9% 20% 30% 18% 2	3960
September	1st to 10th	Day	32% 6% 10% 20% 21% 11%	2090
	11th to 20th	Day	33% 8% 12% 20% 20% 8%	2090
	21st to end	Day	25% 5% 8% 24% 24% 14%	2090
October	1st to 10th	Day	13% 3 7% 14% 29% 35%	3453
	11th to 20th	Day	17% 3 5% 19% 33% 23%	3140
	21st to end	Day	24% 3 4 24% 33% 12%	3428
November	1st to 10th	Day	34% 4 8% 22% 22% 11%	1908
	11th to 20th	Day	28% 4 9% 21% 26% 13%	1782
	21st to end	Day	39% 3 4 20% 22% 13%	1710
December	1st to 10th	Day	34% 4 8% 23% 21% 9%	1710
	11th to 20th	Day	40% 4 7% 14% 24% 11%	2159
	21st to end	Day	37% 3 5% 17% 27% 12%	3135
January	1st to 10th	Night	30% 3 4 17% 32% 14%	4108
	11th to 20th	Night	28% 2 5% 17% 30% 19%	4120
	21st to end	Night	41% 4 4 15% 24% 12%	4532
February	1st to 10th	Night	39% 4 6% 13% 22% 16%	2299
	11th to 20th	Night	38% 3 6% 17% 24% 12%	2218
	21st to end	Night	36% 3 6% 15% 21% 18%	1873
March	1st to 10th	Night	41% 5% 7% 14% 22% 12%	3419
	11th to 20th	Night	41% 6% 10% 19% 17% 7%	3480
	21st to end	Night	36% 6% 8% 18% 24% 7%	3817
April	1st to 10th	Night	31% 5% 9% 21% 19% 15%	2090
	11th to 20th	Night	36% 5% 9% 17% 19% 14%	2012
	21st to end	Night	32% 5% 9% 20% 26% 7%	1749
May	1st to 10th	Night	44% 5% 9% 21% 14% 7%	2850
	11th to 20th	Night	34% 7% 12% 20% 24% 4	2824
	21st to end	Night	35% 8% 12% 29% 12% 5%	3099
June	1st to 10th	Night	21% 7% 14% 33% 21% 4	1710
	11th to 20th	Night	19% 5% 15% 31% 23% 7%	1710
	21st to end	Night	23% 7% 12% 28% 24% 6%	1710
July	1st to 10th	Night	20% 6% 17% 46% 10% 1	2805
	11th to 20th	Night	14% 4 16% 44% 19% 3	2796
	21st to end	Night	28% 7% 18% 35% 11% 1	2999
August	1st to 10th	Night	5% 3 10% 37% 39% 6%	2826
	11th to 20th	Night	16% 4 19% 39% 20% 3	2844
	21st to end	Night	16% 8% 21% 34% 18% 3	3699
September	1st to 10th	Night	27% 6% 12% 23% 20% 12%	2090
	11th to 20th	Night	30% 6% 12% 21% 22% 9%	2090
	21st to end	Night	22% 4 9% 25% 23% 17%	2090
October	1st to 10th	Night	12% 3 6% 16% 22% 41%	3480
	11th to 20th	Night	16% 2 4 18% 32% 28%	3772
	21st to end	Night	23% 3 4 19% 36% 16%	4120
November	1st to 10th	Night	29% 3 7% 19% 27% 14%	2292
	11th to 20th	Night	28% 4 7% 19% 26% 16%	2394
	21st to end	Night	37% 2 6% 17% 25% 13%	2470
December	1st to 10th	Night	31% 4 8% 23% 22% 12%	2470
	11th to 20th	Night	38% 3 5% 13% 26% 14%	3037
	21st to end	Night	35% 3 4 16% 27% 16%	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	18% 13% 35% 25% 9%	270
	11th to 20th	Day	19% 14% 32% 26% 8% 1	270
	21st to end	Day	19% 13% 35% 23% 9% 1	297
February	1st to 10th	Day	23% 16% 34% 22% 6%	270
	11th to 20th	Day	23% 17% 37% 19% 4	270
	21st to end	Day	28% 12% 39% 20% 2	225
March	1st to 10th	Day	22% 12% 37% 24% 4	270
	11th to 20th	Day	20% 17% 36% 19% 6% 1	270
	21st to end	Day	14% 12% 45% 22% 6% 1	297
April	1st to 10th	Day	18% 16% 41% 18% 7%	270
	11th to 20th	Day	18% 14% 34% 25% 9%	314
	21st to end	Day	17% 15% 34% 24% 9% 1	606
May	1st to 10th	Day	13% 13% 34% 31% 8% 1	653
	11th to 20th	Day	16% 6% 28% 32% 14% 4	675
	21st to end	Day	14% 4 30% 29% 18% 4	734
June	1st to 10th	Day	5% 2 16% 40% 27% 10%	680
	11th to 20th	Day	5% 2 17% 44% 26% 6%	680
	21st to end	Day	3 2 12% 35% 36% 12%	680
July	1st to 10th	Day	6% 1 7% 31% 39% 15%	671
	11th to 20th	Day	2 5% 30% 48% 15%	668
	21st to end	Day	6% 1 6% 27% 44% 17%	739
August	1st to 10th	Day	2 5% 28% 45% 20%	676
	11th to 20th	Day	8% 4 28% 45% 16%	654
	21st to end	Day	5% 1 4 21% 38% 31%	411
September	1st to 10th	Day	9% 1 6% 19% 36% 29%	300
	11th to 20th	Day	4 2 5% 21% 39% 28%	300
	21st to end	Day	10% 3 5% 28% 36% 19%	300
October	1st to 10th	Day	3 1 13% 30% 39% 14%	300
	11th to 20th	Day	9% 5% 24% 33% 24% 5%	300
	21st to end	Day	20% 9% 24% 22% 21% 5%	330
November	1st to 10th	Day	21% 4 31% 26% 13% 5%	285
	11th to 20th	Day	11% 10% 27% 30% 18% 4	270
	21st to end	Day	20% 14% 29% 25% 10% 2	270
December	1st to 10th	Day	16% 6% 33% 30% 13% 4	270
	11th to 20th	Day	20% 14% 33% 23% 10% 1	270
	21st to end	Day	21% 6% 37% 25% 9% 1	297
January	1st to 10th	Night	16% 9% 33% 32% 9%	950
	11th to 20th	Night	19% 11% 32% 32% 6%	950
	21st to end	Night	17% 10% 34% 32% 7%	1045
February	1st to 10th	Night	20% 12% 33% 30% 4	779
	11th to 20th	Night	20% 12% 38% 26% 4	744
	21st to end	Night	24% 12% 42% 20% 2	617
March	1st to 10th	Night	19% 11% 38% 27% 4	570
	11th to 20th	Night	16% 10% 37% 32% 5%	570
	21st to end	Night	13% 12% 42% 28% 4	627
April	1st to 10th	Night	11% 11% 45% 30% 4	570
	11th to 20th	Night	15% 11% 40% 29% 5%	563
	21st to end	Night	14% 9% 43% 25% 8% 1	570
May	1st to 10th	Night	12% 11% 39% 31% 7% 1	570
	11th to 20th	Night	12% 6% 34% 34% 12% 1	561
	21st to end	Night	10% 4 32% 38% 14% 2	617
June	1st to 10th	Night	4 2 19% 46% 27% 2	570
	11th to 20th	Night	5% 1 24% 50% 19% 1	570
	21st to end	Night	2 1 17% 44% 33% 4	570
July	1st to 10th	Night	5% 1 10% 45% 35% 3	555
	11th to 20th	Night	3 1 7% 51% 36% 3	552
	21st to end	Night	3 6% 48% 41% 2	624
August	1st to 10th	Night	2 1 3 50% 40% 4	567
	11th to 20th	Night	7% 6% 46% 36% 5%	564
	21st to end	Night	3 1 5% 38% 46% 7%	627
September	1st to 10th	Night	9% 1 8% 39% 39% 5%	570
	11th to 20th	Night	11% 1 9% 38% 38% 4	570
	21st to end	Night	8% 1 11% 38% 37% 5%	570
October	1st to 10th	Night	7% 2 13% 47% 27% 4	570
	11th to 20th	Night	13% 3 23% 40% 19% 2	753
	21st to end	Night	15% 8% 27% 33% 16% 1	836
November	1st to 10th	Night	12% 4 27% 38% 17% 1	764
	11th to 20th	Night	9% 8% 28% 39% 14% 1	874
	21st to end	Night	19% 9% 30% 29% 12% 1	950
December	1st to 10th	Night	15% 8% 31% 36% 9%	950
	11th to 20th	Night	19% 9% 31% 35% 7%	950
	21st to end	Night	19% 8% 33% 32% 7%	1045

Page generated at 2024-11-03 12:19:00. Version ac07

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