Lake Cypress Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Cypress Springs clear sky chart from 2005-11-06 to 2024-08-15.

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	12% 6% 2 6% 4 4 4 3 5% 7% 46%	95411
	Night	12% 6% 2 5% 4 3 3 3 5% 7% 52%	93371
Transparency	Day	37% 7% 10% 22% 19% 5%	95187
	Night	33% 6% 10% 21% 22% 8%	93201
Seeing	Day	13% 6% 21% 26% 24% 9%	14920
	Night	14% 7% 24% 33% 20% 2	24721

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	16% 9% 3 5% 3 3 2 2 3 5% 48%	2847
	11th to 20th	Day	15% 4 2 3 2 3 3 3 4 5% 56%	2850
	21st to end	Day	23% 9% 3 6% 2 3 2 2 3 3 44%	3135
February	1st to 10th	Day	20% 9% 2 8% 4 4 3 3 4 4 41%	1710
	11th to 20th	Day	20% 8% 3 6% 4 3 3 3 4 4 43%	1820
	21st to end	Day	21% 8% 2 6% 2 3 3 2 3 4 47%	1703
March	1st to 10th	Day	15% 10% 3 5% 4 3 3 3 4 6% 42%	3436
	11th to 20th	Day	19% 6% 2 5% 4 5% 5% 3 6% 6% 39%	3480
	21st to end	Day	15% 9% 3 7% 4 4 4 4 5% 7% 38%	3814
April	1st to 10th	Day	12% 6% 2 7% 5% 4 4 3 4 7% 46%	2104
	11th to 20th	Day	15% 6% 3 5% 4 3 4 4 5% 7% 43%	2254
	21st to end	Day	12% 5% 2 6% 5% 4 5% 4 7% 7% 44%	2280
May	1st to 10th	Day	17% 8% 3 8% 5% 5% 4 3 5% 6% 36%	4039
	11th to 20th	Day	13% 6% 3 6% 4 4 4 3 5% 6% 46%	4082
	21st to end	Day	15% 8% 3 8% 5% 5% 5% 4 6% 8% 35%	4477
June	1st to 10th	Day	6% 5% 1 6% 5% 4 6% 4 7% 10% 47%	2470
	11th to 20th	Day	4 4 2 5% 4 5% 6% 6% 6% 9% 48%	2470
	21st to end	Day	5% 4 1 4 3 4 5% 5% 8% 10% 51%	2470
July	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 5% 6% 9% 44%	4120
	11th to 20th	Day	3 3 1 4 3 4 4 3 6% 10% 59%	4120
	21st to end	Day	9% 7% 3 8% 5% 5% 5% 5% 7% 9% 36%	4465
August	1st to 10th	Day	3 2 1 3 5% 4 5% 4 8% 10% 55%	2458
	11th to 20th	Day	8% 4 1 5% 4 5% 5% 5% 7% 9% 47%	2324
	21st to end	Day	6% 5% 2 6% 5% 6% 6% 5% 8% 9% 42%	2376
September	1st to 10th	Day	9% 6% 1 6% 4 4 4 3 6% 7% 50%	2044
	11th to 20th	Day	11% 6% 2 8% 3 4 4 4 5% 8% 45%	1980
	21st to end	Day	8% 5% 1 3 3 4 4 4 5% 8% 57%	1980
October	1st to 10th	Day	7% 4 1 4 3 3 4 3 5% 7% 58%	1840
	11th to 20th	Day	14% 5% 2 4 3 3 3 3 4 5% 56%	1800
	21st to end	Day	16% 5% 2 4 3 2 2 2 3 4 56%	1980
November	1st to 10th	Day	12% 5% 2 4 3 3 4 3 5% 7% 53%	1858
	11th to 20th	Day	9% 5% 2 6% 3 3 3 3 5% 6% 55%	1900
	21st to end	Day	17% 7% 2 4 3 2 2 3 3 5% 50%	1719
December	1st to 10th	Day	15% 7% 3 6% 3 4 3 2 4 5% 49%	1710
	11th to 20th	Day	14% 9% 3 6% 4 3 4 3 4 5% 44%	2161
	21st to end	Day	16% 9% 3 6% 3 3 3 3 4 5% 44%	3135
January	1st to 10th	Night	14% 9% 3 5% 3 3 3 3 3 4 50%	4108
	11th to 20th	Night	15% 6% 2 4 3 2 2 2 3 5% 57%	4120
	21st to end	Night	23% 8% 2 4 3 2 3 2 3 4 45%	4532
February	1st to 10th	Night	15% 7% 3 5% 4 3 3 3 4 5% 48%	2470
	11th to 20th	Night	18% 8% 2 5% 4 3 3 2 3 5% 47%	2261
	21st to end	Night	18% 6% 2 5% 4 2 3 2 3 5% 50%	1750
March	1st to 10th	Night	18% 9% 3 6% 4 3 3 3 5% 6% 39%	3419
	11th to 20th	Night	15% 8% 3 6% 4 4 4 3 5% 7% 43%	3480
	21st to end	Night	13% 6% 3 6% 4 4 4 3 6% 6% 45%	3817
April	1st to 10th	Night	11% 5% 2 5% 4 3 3 4 6% 7% 51%	2075
	11th to 20th	Night	11% 6% 2 5% 4 3 3 4 5% 7% 49%	1875
	21st to end	Night	11% 5% 2 4 3 3 4 4 4 8% 52%	1900
May	1st to 10th	Night	14% 8% 2 7% 5% 4 4 3 6% 7% 39%	2861
	11th to 20th	Night	11% 6% 2 6% 5% 4 3 3 5% 8% 48%	2823
	21st to end	Night	12% 7% 2 6% 4 4 5% 3 6% 8% 43%	3090
June	1st to 10th	Night	4 4 2 4 3 3 3 3 6% 10% 56%	1710
	11th to 20th	Night	4 4 1 4 3 2 2 3 5% 8% 63%	1710
	21st to end	Night	4 2 1 3 4 4 4 4 6% 10% 58%	1710
July	1st to 10th	Night	7% 3 1 4 3 3 4 3 6% 11% 53%	2850
	11th to 20th	Night	3 3 1 2 2 2 2 2 6% 11% 65%	2850
	21st to end	Night	5% 5% 2 6% 5% 5% 5% 5% 7% 9% 46%	3098
August	1st to 10th	Night	3 2 1 2 2 4 3 6% 10% 66%	1701
	11th to 20th	Night	5% 4 2 5% 4 3 4 4 6% 9% 53%	1676
	21st to end	Night	4 3 1 5% 4 4 6% 5% 8% 9% 52%	1980
September	1st to 10th	Night	7% 4 1 4 4 3 4 3 5% 8% 57%	1912
	11th to 20th	Night	11% 4 2 5% 4 3 4 3 5% 7% 53%	1980
	21st to end	Night	7% 2 1 4 3 2 3 3 4 6% 63%	1980
October	1st to 10th	Night	6% 3 1 4 3 3 3 3 4 7% 64%	2101
	11th to 20th	Night	12% 4 1 3 2 2 2 2 4 6% 61%	2160
	21st to end	Night	15% 5% 2 3 3 2 2 1 3 4 60%	2376
November	1st to 10th	Night	10% 4 2 4 3 4 3 2 4 5% 59%	2220
	11th to 20th	Night	8% 5% 2 5% 3 3 3 2 4 6% 57%	2280
	21st to end	Night	15% 6% 2 5% 3 4 3 3 3 5% 51%	2458
December	1st to 10th	Night	13% 6% 3 5% 3 3 3 3 4 6% 52%	2470
	11th to 20th	Night	13% 7% 3 7% 4 4 3 2 3 4 48%	3036
	21st to end	Night	15% 8% 2 5% 3 3 3 2 4 5% 51%	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	40% 4 6% 20% 26% 4	2848
	11th to 20th	Day	31% 4 10% 25% 27% 4	2850
	21st to end	Day	46% 3 4 16% 23% 8%	3135
February	1st to 10th	Day	48% 4 5% 17% 19% 7%	1710
	11th to 20th	Day	46% 3 6% 18% 19% 8%	1830
	21st to end	Day	44% 3 5% 15% 24% 10%	1703
March	1st to 10th	Day	42% 6% 7% 14% 22% 7%	3436
	11th to 20th	Day	43% 7% 8% 23% 15% 4	3480
	21st to end	Day	45% 6% 9% 18% 20% 3	3814
April	1st to 10th	Day	39% 5% 9% 21% 18% 8%	2104
	11th to 20th	Day	39% 7% 9% 18% 19% 8%	2254
	21st to end	Day	38% 8% 9% 20% 21% 4	2280
May	1st to 10th	Day	46% 8% 10% 22% 10% 3	4077
	11th to 20th	Day	37% 7% 10% 23% 21% 1	4086
	21st to end	Day	45% 10% 12% 18% 11% 3	4489
June	1st to 10th	Day	30% 10% 15% 28% 15% 2	2470
	11th to 20th	Day	31% 8% 16% 25% 18% 3	2470
	21st to end	Day	25% 8% 14% 29% 20% 3	2470
July	1st to 10th	Day	34% 10% 23% 25% 9%	4056
	11th to 20th	Day	19% 7% 15% 38% 19% 1	4051
	21st to end	Day	41% 9% 14% 26% 9%	4325
August	1st to 10th	Day	22% 8% 17% 34% 18% 2	2444
	11th to 20th	Day	30% 9% 16% 27% 16% 2	2324
	21st to end	Day	34% 11% 15% 25% 13% 2	2376
September	1st to 10th	Day	32% 7% 11% 22% 19% 9%	2044
	11th to 20th	Day	36% 7% 13% 17% 20% 7%	1980
	21st to end	Day	26% 7% 9% 21% 26% 11%	1980
October	1st to 10th	Day	25% 7% 11% 20% 22% 15%	1840
	11th to 20th	Day	31% 4 6% 17% 26% 15%	1800
	21st to end	Day	34% 4 5% 18% 26% 13%	1980
November	1st to 10th	Day	31% 6% 8% 21% 25% 9%	1858
	11th to 20th	Day	30% 4 9% 19% 28% 10%	1900
	21st to end	Day	39% 4 5% 17% 25% 9%	1719
December	1st to 10th	Day	39% 4 8% 21% 21% 8%	1710
	11th to 20th	Day	42% 5% 5% 16% 25% 8%	2159
	21st to end	Day	42% 5% 5% 20% 22% 7%	3135
January	1st to 10th	Night	37% 5% 6% 14% 31% 7%	4108
	11th to 20th	Night	32% 4 8% 18% 27% 10%	4120
	21st to end	Night	44% 4 6% 15% 23% 8%	4532
February	1st to 10th	Night	39% 4 7% 19% 20% 11%	2470
	11th to 20th	Night	43% 4 6% 16% 23% 9%	2261
	21st to end	Night	39% 5% 7% 15% 21% 13%	1750
March	1st to 10th	Night	46% 5% 7% 14% 17% 11%	3419
	11th to 20th	Night	41% 7% 9% 17% 19% 8%	3480
	21st to end	Night	38% 6% 9% 19% 24% 4	3817
April	1st to 10th	Night	32% 5% 11% 20% 19% 12%	2075
	11th to 20th	Night	34% 6% 9% 19% 20% 12%	1875
	21st to end	Night	32% 6% 10% 22% 26% 5%	1900
May	1st to 10th	Night	42% 9% 10% 21% 13% 5%	2888
	11th to 20th	Night	34% 7% 14% 22% 21% 3	2824
	21st to end	Night	35% 10% 14% 24% 13% 4	3099
June	1st to 10th	Night	22% 7% 16% 29% 22% 4	1710
	11th to 20th	Night	19% 6% 14% 33% 22% 5%	1710
	21st to end	Night	20% 7% 15% 29% 26% 4	1710
July	1st to 10th	Night	24% 7% 23% 34% 12%	2805
	11th to 20th	Night	14% 6% 14% 41% 21% 3	2796
	21st to end	Night	33% 8% 16% 30% 12% 1	2999
August	1st to 10th	Night	13% 6% 19% 34% 25% 3	1691
	11th to 20th	Night	26% 8% 14% 28% 18% 5%	1676
	21st to end	Night	25% 10% 15% 29% 20% 3	1980
September	1st to 10th	Night	26% 7% 12% 24% 23% 8%	1912
	11th to 20th	Night	30% 6% 11% 24% 20% 10%	1980
	21st to end	Night	22% 4 9% 21% 29% 15%	1980
October	1st to 10th	Night	21% 5% 10% 24% 23% 17%	2101
	11th to 20th	Night	26% 4 8% 15% 27% 20%	2160
	21st to end	Night	30% 4 4 19% 26% 17%	2376
November	1st to 10th	Night	28% 4 8% 18% 28% 13%	2220
	11th to 20th	Night	29% 4 7% 19% 26% 14%	2280
	21st to end	Night	37% 4 6% 17% 25% 11%	2458
December	1st to 10th	Night	35% 5% 10% 18% 21% 10%	2470
	11th to 20th	Night	40% 4 5% 15% 24% 11%	3037
	21st to end	Night	36% 4 6% 19% 26% 9%	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	23% 12% 38% 19% 8%	270
	11th to 20th	Day	23% 17% 35% 18% 8%	270
	21st to end	Day	22% 16% 35% 21% 6%	297
February	1st to 10th	Day	24% 13% 39% 19% 5%	270
	11th to 20th	Day	28% 16% 38% 16% 2	270
	21st to end	Day	33% 20% 32% 10% 4	225
March	1st to 10th	Day	20% 16% 37% 23% 5%	270
	11th to 20th	Day	24% 16% 36% 20% 3 1	270
	21st to end	Day	20% 18% 35% 21% 7%	297
April	1st to 10th	Day	21% 14% 36% 23% 5%	284
	11th to 20th	Day	22% 14% 31% 22% 11% 1	452
	21st to end	Day	17% 10% 32% 27% 11% 3	460
May	1st to 10th	Day	13% 10% 32% 32% 12%	623
	11th to 20th	Day	13% 5% 25% 35% 18% 4	675
	21st to end	Day	14% 5% 21% 35% 19% 6%	734
June	1st to 10th	Day	9% 2 13% 30% 34% 11%	680
	11th to 20th	Day	6% 1 13% 38% 33% 10%	680
	21st to end	Day	3 1 12% 30% 37% 17%	680
July	1st to 10th	Day	7% 1 10% 27% 40% 16%	671
	11th to 20th	Day	3 1 5% 29% 43% 19%	668
	21st to end	Day	6% 2 4 27% 44% 18%	739
August	1st to 10th	Day	4 5% 25% 47% 19%	676
	11th to 20th	Day	10% 4 25% 44% 16%	606
	21st to end	Day	8% 1 6% 18% 41% 26%	495
September	1st to 10th	Day	9% 1 5% 20% 42% 23%	334
	11th to 20th	Day	4 11% 22% 35% 27%	270
	21st to end	Day	11% 3 9% 27% 32% 18%	270
October	1st to 10th	Day	6% 1 17% 37% 28% 11%	270
	11th to 20th	Day	13% 7% 30% 25% 18% 7%	270
	21st to end	Day	26% 8% 22% 25% 15% 4	297
November	1st to 10th	Day	17% 4 32% 29% 15% 4	270
	11th to 20th	Day	14% 9% 29% 35% 11% 2	270
	21st to end	Day	22% 14% 27% 24% 11% 1	270
December	1st to 10th	Day	20% 13% 32% 22% 11% 2	270
	11th to 20th	Day	19% 13% 39% 22% 7% 1	270
	21st to end	Day	23% 12% 39% 20% 5% 1	297
January	1st to 10th	Night	17% 15% 30% 31% 8%	950
	11th to 20th	Night	21% 13% 33% 26% 7% 1	950
	21st to end	Night	20% 11% 35% 29% 5%	1045
February	1st to 10th	Night	20% 12% 35% 27% 6%	950
	11th to 20th	Night	25% 12% 35% 25% 3	787
	21st to end	Night	22% 17% 36% 21% 3	494
March	1st to 10th	Night	21% 10% 33% 29% 6%	570
	11th to 20th	Night	17% 10% 33% 33% 6%	570
	21st to end	Night	15% 11% 35% 33% 7%	627
April	1st to 10th	Night	13% 10% 41% 30% 6%	570
	11th to 20th	Night	14% 12% 35% 28% 11%	563
	21st to end	Night	14% 8% 35% 33% 9% 1	570
May	1st to 10th	Night	11% 6% 35% 37% 10% 1	570
	11th to 20th	Night	10% 6% 27% 38% 18% 2	561
	21st to end	Night	9% 2 24% 41% 22% 3	617
June	1st to 10th	Night	6% 1 12% 37% 41% 2	570
	11th to 20th	Night	5% 2 12% 45% 35% 2	570
	21st to end	Night	4 1 9% 35% 43% 8%	570
July	1st to 10th	Night	4 1 6% 40% 44% 6%	555
	11th to 20th	Night	3 5% 34% 51% 7%	552
	21st to end	Night	3 5% 37% 48% 7%	624
August	1st to 10th	Night	4 1 4 36% 51% 5%	567
	11th to 20th	Night	7% 5% 31% 49% 7%	549
	21st to end	Night	5% 1 5% 30% 51% 8%	594
September	1st to 10th	Night	10% 1 7% 31% 44% 7%	540
	11th to 20th	Night	12% 1 8% 32% 44% 4	540
	21st to end	Night	8% 1 10% 38% 39% 4	540
October	1st to 10th	Night	7% 2 13% 44% 31% 3	661
	11th to 20th	Night	14% 4 24% 38% 18% 2	720
	21st to end	Night	17% 7% 26% 31% 17% 2	792
November	1st to 10th	Night	11% 4 25% 42% 16% 2	740
	11th to 20th	Night	12% 7% 30% 39% 11% 1	760
	21st to end	Night	19% 11% 30% 27% 13%	938
December	1st to 10th	Night	16% 12% 31% 34% 7%	950
	11th to 20th	Night	18% 11% 29% 35% 7%	950
	21st to end	Night	20% 11% 32% 30% 7%	1045

Page generated at 2024-08-12 08:52:53. Version ac07

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