Cypress Creek Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cypress Creek Park clear sky chart from 2005-11-06 to 2024-11-05.

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 4 5% 7% 45%	100595
	Night	12% 5% 2 5% 4 3 4 3 5% 7% 50%	98475
Transparency	Day	37% 6% 10% 23% 20% 5%	104240
	Night	32% 5% 10% 23% 22% 7%	102970
Seeing	Day	14% 7% 19% 26% 24% 10%	15373
	Night	14% 6% 22% 36% 20% 2	25151

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	18% 7% 3 6% 4 3 3 3 3 5% 45%	2847
	11th to 20th	Day	11% 10% 2 6% 4 2 4 2 4 5% 49%	2850
	21st to end	Day	24% 8% 2 4 3 2 3 2 3 3 47%	3135
February	1st to 10th	Day	20% 9% 2 6% 3 3 2 3 3 5% 43%	1710
	11th to 20th	Day	16% 9% 3 7% 4 3 4 2 3 6% 43%	1767
	21st to end	Day	21% 9% 3 6% 4 4 3 3 4 5% 38%	1636
March	1st to 10th	Day	19% 10% 3 6% 5% 4 3 3 3 5% 40%	3436
	11th to 20th	Day	13% 6% 3 6% 4 4 4 3 4 6% 47%	3480
	21st to end	Day	16% 8% 3 7% 4 4 4 3 4 5% 43%	3814
April	1st to 10th	Day	12% 7% 2 7% 5% 4 4 3 6% 7% 45%	2266
	11th to 20th	Day	16% 6% 2 5% 4 4 4 3 4 6% 45%	2254
	21st to end	Day	15% 6% 3 7% 5% 4 4 4 5% 6% 41%	2280
May	1st to 10th	Day	15% 7% 3 8% 5% 4 5% 4 5% 7% 37%	3783
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 4 7% 8% 43%	4082
	21st to end	Day	12% 7% 3 8% 6% 6% 6% 5% 6% 8% 34%	4477
June	1st to 10th	Day	8% 5% 2 6% 5% 5% 6% 4 6% 9% 43%	2562
	11th to 20th	Day	4 4 2 5% 5% 6% 6% 5% 8% 10% 46%	2632
	21st to end	Day	4 3 1 5% 5% 6% 6% 5% 7% 9% 50%	2470
July	1st to 10th	Day	9% 5% 3 6% 5% 5% 6% 6% 7% 10% 39%	4120
	11th to 20th	Day	5% 3 2 4 4 4 5% 4 6% 9% 52%	4120
	21st to end	Day	10% 9% 3 7% 6% 5% 5% 6% 7% 8% 34%	4465
August	1st to 10th	Day	4 3 1 3 3 3 5% 4 6% 8% 60%	4104
	11th to 20th	Day	10% 6% 2 7% 4 4 5% 4 8% 10% 40%	3789
	21st to end	Day	5% 4 2 5% 4 4 5% 4 7% 8% 52%	4180
September	1st to 10th	Day	11% 6% 1 5% 4 4 4 4 5% 7% 47%	2280
	11th to 20th	Day	14% 5% 2 5% 4 4 4 3 6% 8% 45%	2262
	21st to end	Day	10% 4 2 4 4 4 4 3 4 6% 53%	1989
October	1st to 10th	Day	6% 5% 2 4 4 3 3 4 5% 6% 58%	1900
	11th to 20th	Day	13% 4 1 5% 2 3 3 2 3 5% 57%	1900
	21st to end	Day	17% 5% 2 4 3 3 3 3 4 5% 52%	2090
November	1st to 10th	Day	11% 6% 1 4 3 3 3 2 4 6% 56%	1898
	11th to 20th	Day	9% 6% 2 5% 3 2 3 3 5% 7% 55%	1857
	21st to end	Day	18% 7% 3 4 4 4 3 2 4 6% 45%	1638
December	1st to 10th	Day	19% 6% 2 4 2 3 3 3 4 6% 48%	1520
	11th to 20th	Day	12% 10% 3 6% 5% 5% 4 3 4 5% 44%	1918
	21st to end	Day	13% 7% 3 8% 6% 5% 4 4 5% 6% 38%	3084
January	1st to 10th	Night	16% 7% 2 6% 4 4 3 3 4 5% 46%	4108
	11th to 20th	Night	15% 6% 2 5% 3 2 3 2 4 5% 54%	4120
	21st to end	Night	24% 6% 2 4 2 3 2 2 3 4 48%	4532
February	1st to 10th	Night	19% 8% 2 6% 4 3 3 3 4 5% 42%	2470
	11th to 20th	Night	16% 8% 2 6% 3 3 3 2 4 6% 46%	2297
	21st to end	Night	18% 7% 2 5% 3 3 3 2 3 5% 48%	1832
March	1st to 10th	Night	20% 8% 2 5% 3 3 4 3 5% 6% 41%	3419
	11th to 20th	Night	15% 6% 2 6% 4 3 3 2 4 4 51%	3480
	21st to end	Night	12% 6% 2 7% 4 4 4 3 5% 8% 44%	3817
April	1st to 10th	Night	12% 5% 2 5% 4 3 4 3 6% 6% 51%	1914
	11th to 20th	Night	11% 5% 2 4 4 4 4 3 5% 7% 50%	1875
	21st to end	Night	14% 6% 2 6% 4 3 4 3 5% 7% 47%	1900
May	1st to 10th	Night	14% 6% 3 7% 5% 5% 4 4 6% 8% 39%	3109
	11th to 20th	Night	14% 7% 2 6% 4 3 4 3 6% 7% 44%	2823
	21st to end	Night	14% 7% 2 6% 4 5% 5% 3 5% 7% 42%	3090
June	1st to 10th	Night	5% 4 2 4 3 3 4 4 7% 11% 52%	1605
	11th to 20th	Night	4 3 1 4 4 3 4 4 5% 9% 60%	1531
	21st to end	Night	3 2 1 4 4 4 3 3 6% 9% 62%	1710
July	1st to 10th	Night	7% 4 2 6% 4 4 5% 4 5% 10% 48%	2850
	11th to 20th	Night	4 3 2 4 3 3 3 3 6% 9% 60%	2850
	21st to end	Night	6% 7% 2 7% 5% 5% 6% 4 6% 10% 42%	3098
August	1st to 10th	Night	2 2 1 4 2 3 3 3 5% 8% 67%	2836
	11th to 20th	Night	5% 3 1 5% 4 4 4 4 6% 9% 56%	3040
	21st to end	Night	3 2 1 4 4 4 5% 4 7% 10% 56%	3476
September	1st to 10th	Night	7% 5% 2 5% 3 4 3 3 5% 7% 56%	1900
	11th to 20th	Night	11% 5% 2 5% 3 4 4 4 5% 7% 51%	1913
	21st to end	Night	9% 4 1 4 2 2 4 4 4 7% 60%	2171
October	1st to 10th	Night	7% 3 1 4 3 3 3 3 5% 7% 61%	2280
	11th to 20th	Night	10% 4 2 4 3 3 3 2 3 4 62%	2280
	21st to end	Night	16% 5% 2 4 3 3 3 2 3 4 55%	2508
November	1st to 10th	Night	11% 5% 2 5% 3 3 3 2 4 6% 57%	2280
	11th to 20th	Night	11% 5% 1 4 3 3 3 2 5% 6% 57%	2319
	21st to end	Night	13% 6% 2 4 4 3 3 3 4 6% 51%	2539
December	1st to 10th	Night	18% 6% 1 5% 4 3 3 3 5% 6% 47%	2660
	11th to 20th	Night	15% 6% 2 5% 5% 4 4 2 4 4 49%	3279
	21st to end	Night	14% 7% 3 6% 4 4 4 3 4 6% 44%	4564

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	43% 4 6% 24% 20% 4	2848
	11th to 20th	Day	39% 4 11% 21% 22% 3	2850
	21st to end	Day	44% 3 6% 18% 22% 7%	3135
February	1st to 10th	Day	45% 5% 10% 20% 16% 4	1710
	11th to 20th	Day	44% 4 7% 20% 19% 6%	1776
	21st to end	Day	49% 5% 7% 14% 16% 9%	1636
March	1st to 10th	Day	46% 6% 7% 12% 18% 10%	3436
	11th to 20th	Day	39% 5% 10% 22% 19% 4	3480
	21st to end	Day	44% 5% 9% 21% 20% 1	3814
April	1st to 10th	Day	38% 7% 9% 21% 21% 4	2266
	11th to 20th	Day	40% 6% 10% 21% 17% 7%	2254
	21st to end	Day	42% 6% 10% 21% 19% 2	2280
May	1st to 10th	Day	45% 7% 11% 21% 14% 2	3818
	11th to 20th	Day	36% 8% 13% 26% 15% 1	4086
	21st to end	Day	43% 10% 13% 20% 12% 2	4489
June	1st to 10th	Day	35% 9% 14% 24% 16% 2	2562
	11th to 20th	Day	30% 9% 15% 27% 18% 2	2632
	21st to end	Day	28% 9% 13% 27% 20% 4	2470
July	1st to 10th	Day	37% 7% 15% 29% 11% 1	4056
	11th to 20th	Day	27% 6% 10% 34% 21% 2	4051
	21st to end	Day	46% 6% 16% 22% 9% 1	4325
August	1st to 10th	Day	22% 6% 15% 29% 22% 6%	4090
	11th to 20th	Day	37% 6% 14% 30% 12% 1	3826
	21st to end	Day	29% 6% 10% 31% 20% 3	4179
September	1st to 10th	Day	35% 8% 11% 19% 19% 8%	2280
	11th to 20th	Day	36% 7% 12% 18% 22% 5%	2262
	21st to end	Day	32% 5% 9% 20% 27% 7%	1989
October	1st to 10th	Day	16% 3 5% 13% 38% 24%	3160
	11th to 20th	Day	19% 2 4 19% 38% 18%	3140
	21st to end	Day	32% 3 5% 29% 25% 6%	3428
November	1st to 10th	Day	31% 4 8% 26% 22% 8%	1898
	11th to 20th	Day	29% 5% 9% 21% 28% 9%	1857
	21st to end	Day	42% 4 7% 18% 24% 5%	1638
December	1st to 10th	Day	39% 5% 9% 24% 18% 6%	1520
	11th to 20th	Day	42% 5% 6% 19% 23% 5%	1915
	21st to end	Day	43% 6% 12% 17% 17% 6%	3084
January	1st to 10th	Night	40% 4 7% 19% 27% 3	4108
	11th to 20th	Night	34% 5% 11% 21% 25% 5%	4120
	21st to end	Night	42% 3 10% 18% 23% 4	4532
February	1st to 10th	Night	44% 4 8% 19% 18% 6%	2470
	11th to 20th	Night	41% 4 7% 21% 20% 6%	2298
	21st to end	Night	40% 4 8% 18% 21% 9%	1832
March	1st to 10th	Night	44% 5% 9% 12% 19% 11%	3419
	11th to 20th	Night	37% 5% 8% 26% 18% 6%	3480
	21st to end	Night	38% 6% 9% 24% 21% 2	3817
April	1st to 10th	Night	33% 5% 10% 23% 20% 9%	1914
	11th to 20th	Night	32% 6% 8% 24% 21% 9%	1875
	21st to end	Night	36% 5% 11% 23% 21% 3	1900
May	1st to 10th	Night	41% 9% 11% 22% 14% 3	3139
	11th to 20th	Night	37% 7% 15% 26% 14% 1	2824
	21st to end	Night	40% 8% 15% 22% 13% 3	3099
June	1st to 10th	Night	24% 9% 15% 31% 20% 2	1605
	11th to 20th	Night	21% 6% 12% 32% 26% 3	1531
	21st to end	Night	20% 7% 13% 30% 24% 7%	1710
July	1st to 10th	Night	31% 6% 17% 27% 17% 1	2805
	11th to 20th	Night	20% 6% 11% 35% 24% 3	2796
	21st to end	Night	38% 7% 15% 25% 15%	2999
August	1st to 10th	Night	16% 5% 16% 33% 25% 5%	2826
	11th to 20th	Night	23% 6% 18% 35% 16% 2	3069
	21st to end	Night	22% 6% 13% 32% 25% 3	3476
September	1st to 10th	Night	27% 7% 10% 25% 22% 9%	1900
	11th to 20th	Night	32% 6% 10% 20% 26% 6%	1913
	21st to end	Night	25% 4 10% 21% 30% 9%	2171
October	1st to 10th	Night	16% 3 7% 14% 30% 30%	3800
	11th to 20th	Night	16% 3 4 15% 39% 23%	3779
	21st to end	Night	29% 2 4 24% 29% 12%	4120
November	1st to 10th	Night	30% 4 8% 23% 26% 10%	2280
	11th to 20th	Night	29% 4 7% 24% 26% 10%	2319
	21st to end	Night	35% 4 8% 20% 27% 5%	2539
December	1st to 10th	Night	40% 4 9% 20% 21% 6%	2660
	11th to 20th	Night	39% 4 6% 20% 24% 6%	3281
	21st to end	Night	40% 6% 10% 23% 19% 4	4564

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	24% 11% 29% 27% 8% 2	270
	11th to 20th	Day	25% 14% 35% 21% 4	270
	21st to end	Day	20% 14% 36% 21% 8%	297
February	1st to 10th	Day	25% 12% 35% 18% 8% 1	270
	11th to 20th	Day	24% 12% 38% 20% 5% 1	270
	21st to end	Day	34% 13% 33% 15% 4	225
March	1st to 10th	Day	24% 12% 31% 24% 9%	270
	11th to 20th	Day	22% 16% 36% 21% 4	270
	21st to end	Day	22% 17% 37% 15% 7% 1	297
April	1st to 10th	Day	19% 11% 34% 24% 10% 2	446
	11th to 20th	Day	20% 13% 29% 27% 11% 1	452
	21st to end	Day	20% 10% 28% 28% 12% 2	460
May	1st to 10th	Day	17% 10% 25% 31% 15% 2	468
	11th to 20th	Day	15% 5% 20% 31% 23% 6%	675
	21st to end	Day	9% 4 19% 35% 25% 8%	734
June	1st to 10th	Day	9% 5% 12% 26% 34% 14%	680
	11th to 20th	Day	5% 2 11% 30% 37% 15%	680
	21st to end	Day	4 3 13% 34% 31% 16%	680
July	1st to 10th	Day	6% 3 8% 26% 39% 18%	671
	11th to 20th	Day	5% 1 7% 30% 34% 23%	668
	21st to end	Day	8% 2 6% 23% 38% 23%	739
August	1st to 10th	Day	7% 2 6% 30% 40% 15%	676
	11th to 20th	Day	15% 2 8% 21% 38% 17%	515
	21st to end	Day	9% 1 4 18% 40% 27%	539
September	1st to 10th	Day	12% 1 5% 22% 42% 17%	490
	11th to 20th	Day	12% 2 8% 23% 37% 18%	472
	21st to end	Day	14% 4 10% 32% 25% 14%	300
October	1st to 10th	Day	7% 3 19% 29% 33% 10%	300
	11th to 20th	Day	14% 6% 26% 33% 18% 4	300
	21st to end	Day	23% 10% 24% 27% 13% 4	330
November	1st to 10th	Day	17% 7% 30% 23% 19% 4	282
	11th to 20th	Day	12% 8% 30% 34% 13% 3	270
	21st to end	Day	24% 13% 22% 23% 16% 2	270
December	1st to 10th	Day	22% 9% 34% 19% 14% 2	270
	11th to 20th	Day	26% 11% 29% 22% 13%	270
	21st to end	Day	18% 16% 37% 25% 3 1	297
January	1st to 10th	Night	22% 8% 31% 33% 6%	950
	11th to 20th	Night	20% 9% 35% 31% 5%	950
	21st to end	Night	20% 7% 35% 34% 4	1045
February	1st to 10th	Night	24% 9% 32% 31% 4	950
	11th to 20th	Night	21% 10% 36% 32% 1	822
	21st to end	Night	21% 10% 39% 27% 2	576
March	1st to 10th	Night	19% 8% 30% 38% 5%	570
	11th to 20th	Night	19% 9% 33% 33% 5%	570
	21st to end	Night	17% 8% 34% 33% 7%	627
April	1st to 10th	Night	15% 9% 34% 34% 8%	570
	11th to 20th	Night	15% 8% 33% 35% 9% 1	563
	21st to end	Night	14% 6% 34% 34% 11%	570
May	1st to 10th	Night	15% 4 20% 49% 13%	570
	11th to 20th	Night	15% 5% 21% 35% 22% 1	561
	21st to end	Night	9% 3 13% 44% 26% 4	617
June	1st to 10th	Night	5% 2 10% 40% 38% 5%	570
	11th to 20th	Night	4 1 6% 43% 42% 3	570
	21st to end	Night	3 1 7% 37% 46% 5%	570
July	1st to 10th	Night	5% 1 6% 34% 48% 7%	555
	11th to 20th	Night	3 1 5% 32% 49% 9%	552
	21st to end	Night	4 1 5% 32% 49% 9%	624
August	1st to 10th	Night	4 1 5% 34% 51% 5%	567
	11th to 20th	Night	8% 2 4 35% 45% 6%	564
	21st to end	Night	7% 1 5% 27% 53% 7%	627
September	1st to 10th	Night	9% 1 4 35% 47% 5%	570
	11th to 20th	Night	11% 2 7% 33% 44% 3	570
	21st to end	Night	10% 2 11% 35% 38% 4	651
October	1st to 10th	Night	8% 2 12% 37% 37% 3	760
	11th to 20th	Night	11% 4 23% 42% 19% 1	760
	21st to end	Night	18% 6% 22% 36% 16% 2	836
November	1st to 10th	Night	13% 4 20% 45% 17% 1	760
	11th to 20th	Night	13% 7% 27% 39% 13%	760
	21st to end	Night	16% 10% 26% 35% 13%	829
December	1st to 10th	Night	21% 6% 28% 38% 7%	950
	11th to 20th	Night	21% 8% 25% 38% 6%	950
	21st to end	Night	19% 12% 29% 35% 5%	1045

Page generated at 2024-11-03 01:11:19. Version ac07

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