Moody Gardens
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moody Gardens clear sky chart from 2005-11-06 to 2024-02-20.

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 5% 5% 3 5% 5% 6% 9% 42%	78860
	Night	12% 6% 3 5% 5% 3 4 4 5% 8% 45%	80384
Transparency	Day	37% 7% 16% 21% 14% 5%	78585
	Night	36% 6% 14% 21% 16% 7%	80179
Seeing	Day	12% 3 12% 24% 33% 16%	13762
	Night	13% 4 15% 28% 30% 9%	23785

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	19% 10% 3 5% 4 3 4 4 5% 5% 38%	2847
	11th to 20th	Day	16% 6% 2 6% 4 2 3 3 4 6% 48%	2850
	21st to end	Day	22% 9% 3 6% 4 2 4 5% 6% 6% 33%	3135
February	1st to 10th	Day	20% 10% 3 6% 5% 3 4 3 4 6% 37%	1770
	11th to 20th	Day	23% 10% 3 6% 4 2 3 3 3 5% 38%	1916
	21st to end	Day	22% 10% 3 5% 5% 2 4 4 4 6% 36%	1628
March	1st to 10th	Day	18% 8% 3 5% 6% 3 5% 4 5% 6% 38%	1980
	11th to 20th	Day	17% 7% 3 6% 5% 3 4 4 4 6% 42%	1980
	21st to end	Day	14% 6% 3 5% 4 2 3 4 5% 7% 48%	2178
April	1st to 10th	Day	15% 8% 4 5% 5% 2 5% 4 5% 6% 41%	1980
	11th to 20th	Day	14% 7% 3 6% 5% 3 5% 4 4 8% 41%	2120
	21st to end	Day	10% 6% 3 5% 4 3 4 5% 5% 6% 48%	2160
May	1st to 10th	Day	10% 4 3 6% 5% 3 5% 5% 7% 9% 43%	2160
	11th to 20th	Day	10% 5% 2 6% 5% 3 5% 6% 6% 9% 44%	2248
	21st to end	Day	7% 5% 2 5% 6% 3 7% 7% 9% 13% 37%	2531
June	1st to 10th	Day	5% 3 2 4 6% 3 4 7% 8% 11% 47%	2340
	11th to 20th	Day	5% 3 1 5% 5% 4 6% 7% 9% 12% 42%	2340
	21st to end	Day	7% 4 2 5% 6% 4 6% 8% 10% 13% 35%	2340
July	1st to 10th	Day	10% 5% 2 4 4 3 6% 6% 9% 14% 37%	2340
	11th to 20th	Day	5% 4 2 5% 5% 4 5% 7% 9% 13% 41%	2340
	21st to end	Day	4 4 2 5% 5% 4 6% 7% 9% 13% 41%	2546
August	1st to 10th	Day	3 2 1 3 4 3 5% 7% 9% 14% 49%	2328
	11th to 20th	Day	5% 3 1 4 5% 4 6% 7% 10% 15% 40%	2155
	21st to end	Day	10% 5% 2 6% 6% 3 6% 7% 8% 12% 36%	2376
September	1st to 10th	Day	8% 6% 2 5% 6% 4 6% 8% 8% 10% 38%	1998
	11th to 20th	Day	15% 6% 3 5% 5% 3 5% 6% 7% 8% 35%	1980
	21st to end	Day	9% 5% 2 5% 5% 3 4 5% 6% 8% 48%	1980
October	1st to 10th	Day	6% 3 2 4 5% 3 4 5% 6% 9% 54%	1841
	11th to 20th	Day	11% 4 1 4 4 3 4 4 5% 7% 54%	1800
	21st to end	Day	13% 3 2 4 3 2 3 4 4 7% 55%	1980
November	1st to 10th	Day	10% 5% 2 4 5% 3 3 4 5% 8% 50%	1858
	11th to 20th	Day	13% 5% 2 4 5% 4 4 5% 4 6% 48%	1900
	21st to end	Day	16% 6% 3 6% 5% 3 4 4 4 5% 44%	1900
December	1st to 10th	Day	16% 6% 3 5% 4 2 5% 4 5% 6% 44%	1739
	11th to 20th	Day	14% 7% 3 6% 5% 4 5% 5% 4 7% 41%	2161
	21st to end	Day	16% 7% 3 5% 5% 3 4 4 5% 7% 41%	3135
January	1st to 10th	Night	19% 9% 3 5% 5% 3 4 4 5% 5% 37%	4108
	11th to 20th	Night	15% 8% 3 5% 4 2 3 3 4 6% 46%	4120
	21st to end	Night	23% 9% 3 5% 5% 2 3 4 4 7% 33%	4532
February	1st to 10th	Night	19% 10% 3 5% 4 2 3 4 4 6% 38%	2426
	11th to 20th	Night	20% 9% 3 5% 4 2 3 3 3 6% 43%	2133
	21st to end	Night	21% 8% 3 5% 5% 2 4 4 4 5% 38%	1628
March	1st to 10th	Night	17% 8% 3 4 4 2 4 3 5% 7% 42%	1980
	11th to 20th	Night	14% 8% 3 6% 5% 3 4 5% 5% 6% 41%	1980
	21st to end	Night	12% 6% 3 4 5% 3 3 4 5% 7% 51%	2178
April	1st to 10th	Night	14% 7% 2 5% 6% 3 5% 4 5% 8% 41%	1980
	11th to 20th	Night	14% 6% 2 5% 4 2 4 4 5% 7% 45%	1787
	21st to end	Night	11% 6% 3 5% 6% 4 4 5% 6% 8% 44%	1800
May	1st to 10th	Night	10% 6% 2 5% 5% 3 5% 6% 6% 9% 44%	1800
	11th to 20th	Night	8% 4 2 4 4 3 5% 5% 5% 8% 51%	1643
	21st to end	Night	6% 3 3 4 5% 3 5% 6% 8% 11% 46%	1745
June	1st to 10th	Night	4 3 1 4 4 3 3 5% 6% 11% 55%	1620
	11th to 20th	Night	4 3 2 4 5% 3 4 5% 7% 11% 51%	1620
	21st to end	Night	6% 4 3 6% 6% 3 6% 6% 9% 12% 40%	1620
July	1st to 10th	Night	6% 6% 3 5% 6% 3 5% 7% 6% 13% 40%	1620
	11th to 20th	Night	2 2 2 4 5% 2 5% 5% 8% 14% 51%	1620
	21st to end	Night	3 3 2 4 4 3 5% 6% 7% 14% 50%	1772
August	1st to 10th	Night	2 1 1 1 4 3 4 5% 7% 11% 61%	1611
	11th to 20th	Night	4 3 2 4 4 3 5% 6% 7% 13% 51%	1745
	21st to end	Night	6% 4 2 4 5% 4 5% 6% 8% 12% 45%	1980
September	1st to 10th	Night	5% 4 2 4 7% 4 5% 6% 7% 11% 44%	1957
	11th to 20th	Night	12% 6% 3 6% 5% 3 5% 6% 6% 8% 40%	1980
	21st to end	Night	8% 5% 2 5% 4 3 4 4 4 9% 52%	1980
October	1st to 10th	Night	5% 4 2 4 3 2 4 4 6% 8% 57%	2099
	11th to 20th	Night	9% 4 2 3 4 2 4 4 4 6% 58%	2160
	21st to end	Night	11% 5% 1 4 4 2 3 3 4 5% 58%	2376
November	1st to 10th	Night	10% 4 2 4 4 2 4 4 5% 6% 55%	2220
	11th to 20th	Night	13% 5% 2 4 4 3 3 5% 4 6% 50%	2280
	21st to end	Night	13% 7% 3 6% 5% 3 4 5% 5% 6% 43%	2280
December	1st to 10th	Night	18% 8% 3 5% 5% 3 3 3 4 7% 42%	2436
	11th to 20th	Night	15% 7% 3 5% 5% 3 4 5% 5% 7% 41%	3036
	21st to end	Night	16% 7% 3 6% 5% 3 4 4 5% 6% 42%	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	47% 4 6% 16% 18% 8%	2848
	11th to 20th	Day	35% 8% 10% 20% 17% 10%	2850
	21st to end	Day	51% 4 5% 15% 16% 9%	3135
February	1st to 10th	Day	49% 4 8% 15% 14% 10%	1770
	11th to 20th	Day	50% 4 9% 13% 16% 8%	1926
	21st to end	Day	50% 5% 10% 14% 14% 8%	1628
March	1st to 10th	Day	47% 5% 13% 15% 17% 4	1980
	11th to 20th	Day	44% 5% 11% 14% 18% 8%	1980
	21st to end	Day	36% 7% 15% 17% 20% 6%	2178
April	1st to 10th	Day	43% 6% 12% 18% 14% 7%	1980
	11th to 20th	Day	42% 5% 14% 17% 14% 8%	2120
	21st to end	Day	34% 6% 14% 21% 19% 5%	2160
May	1st to 10th	Day	35% 8% 16% 19% 16% 6%	2160
	11th to 20th	Day	34% 7% 17% 25% 16% 3	2252
	21st to end	Day	33% 9% 19% 27% 11% 1	2531
June	1st to 10th	Day	26% 9% 21% 30% 14%	2340
	11th to 20th	Day	27% 10% 22% 29% 12% 1	2340
	21st to end	Day	35% 11% 23% 25% 6%	2340
July	1st to 10th	Day	34% 9% 28% 25% 4	2276
	11th to 20th	Day	30% 12% 31% 23% 5%	2271
	21st to end	Day	29% 11% 30% 25% 4	2405
August	1st to 10th	Day	20% 10% 32% 31% 7%	2314
	11th to 20th	Day	28% 13% 29% 26% 4 1	2155
	21st to end	Day	37% 11% 23% 22% 6% 2	2376
September	1st to 10th	Day	34% 14% 19% 19% 11% 3	1998
	11th to 20th	Day	43% 9% 14% 20% 13% 2	1980
	21st to end	Day	34% 7% 15% 22% 15% 7%	1980
October	1st to 10th	Day	26% 6% 12% 28% 19% 9%	1841
	11th to 20th	Day	29% 6% 9% 24% 21% 11%	1800
	21st to end	Day	30% 4 8% 20% 24% 14%	1980
November	1st to 10th	Day	32% 6% 12% 22% 21% 7%	1858
	11th to 20th	Day	36% 5% 12% 17% 20% 10%	1900
	21st to end	Day	42% 5% 9% 19% 17% 8%	1900
December	1st to 10th	Day	40% 4 15% 21% 15% 5%	1739
	11th to 20th	Day	42% 6% 10% 15% 18% 9%	2159
	21st to end	Day	42% 6% 9% 15% 19% 10%	3135
January	1st to 10th	Night	46% 6% 8% 13% 15% 12%	4108
	11th to 20th	Night	38% 5% 7% 16% 23% 11%	4120
	21st to end	Night	51% 4 6% 13% 17% 9%	4532
February	1st to 10th	Night	47% 4 9% 11% 17% 11%	2426
	11th to 20th	Night	44% 3 9% 15% 18% 11%	2133
	21st to end	Night	48% 4 10% 12% 16% 9%	1628
March	1st to 10th	Night	41% 4 12% 20% 16% 7%	1980
	11th to 20th	Night	42% 6% 14% 14% 17% 8%	1980
	21st to end	Night	34% 5% 13% 20% 20% 8%	2178
April	1st to 10th	Night	40% 6% 11% 20% 15% 8%	1980
	11th to 20th	Night	37% 6% 13% 19% 14% 11%	1787
	21st to end	Night	37% 6% 13% 20% 18% 7%	1800
May	1st to 10th	Night	34% 8% 14% 20% 16% 8%	1800
	11th to 20th	Night	29% 6% 14% 28% 20% 4	1644
	21st to end	Night	28% 7% 21% 29% 14% 1	1746
June	1st to 10th	Night	23% 5% 19% 35% 18%	1620
	11th to 20th	Night	24% 5% 20% 33% 15% 2	1620
	21st to end	Night	34% 9% 24% 24% 9%	1620
July	1st to 10th	Night	34% 8% 27% 26% 5%	1575
	11th to 20th	Night	23% 9% 33% 28% 7%	1566
	21st to end	Night	24% 9% 30% 32% 4	1673
August	1st to 10th	Night	15% 8% 29% 40% 7%	1601
	11th to 20th	Night	24% 9% 30% 31% 6%	1745
	21st to end	Night	29% 11% 26% 26% 7% 1	1980
September	1st to 10th	Night	32% 9% 23% 20% 12% 3	1957
	11th to 20th	Night	41% 9% 14% 19% 14% 3	1980
	21st to end	Night	32% 6% 14% 23% 18% 6%	1980
October	1st to 10th	Night	26% 4 12% 28% 19% 11%	2099
	11th to 20th	Night	25% 6% 9% 26% 22% 12%	2160
	21st to end	Night	29% 4 9% 17% 25% 17%	2376
November	1st to 10th	Night	30% 5% 12% 23% 20% 9%	2220
	11th to 20th	Night	35% 4 11% 22% 19% 9%	2280
	21st to end	Night	41% 5% 9% 21% 17% 7%	2280
December	1st to 10th	Night	43% 4 11% 20% 14% 7%	2436
	11th to 20th	Night	43% 5% 9% 14% 16% 13%	3037
	21st to end	Night	44% 5% 9% 14% 21% 7%	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	21% 9% 28% 32% 10%	270
	11th to 20th	Day	15% 9% 24% 36% 14% 1	270
	21st to end	Day	20% 9% 26% 34% 11%	297
February	1st to 10th	Day	26% 4 27% 31% 10% 1	270
	11th to 20th	Day	27% 7% 20% 34% 10% 1	267
	21st to end	Day	21% 10% 30% 34% 4	198
March	1st to 10th	Day	16% 6% 30% 37% 11%	240
	11th to 20th	Day	20% 5% 25% 40% 8% 2	240
	21st to end	Day	14% 6% 28% 38% 13%	264
April	1st to 10th	Day	17% 8% 27% 36% 13%	240
	11th to 20th	Day	18% 6% 29% 26% 20% 1	398
	21st to end	Day	14% 4 22% 39% 20% 1	420
May	1st to 10th	Day	12% 5% 20% 38% 24% 1	423
	11th to 20th	Day	11% 2 13% 36% 34% 4	571
	21st to end	Day	7% 1 10% 37% 40% 5%	679
June	1st to 10th	Day	6% 1 3 27% 49% 14%	630
	11th to 20th	Day	8% 1 4 25% 49% 14%	630
	21st to end	Day	9% 1 5% 15% 44% 25%	630
July	1st to 10th	Day	7% 2 4 10% 44% 33%	621
	11th to 20th	Day	5% 2 6% 47% 40%	618
	21st to end	Day	5% 2 10% 50% 33%	684
August	1st to 10th	Day	2 1 7% 45% 45%	626
	11th to 20th	Day	4 1 5% 42% 47%	469
	21st to end	Day	11% 1 4 10% 32% 41%	495
September	1st to 10th	Day	11% 1 3 7% 39% 38%	288
	11th to 20th	Day	11% 2 2 11% 43% 31%	270
	21st to end	Day	12% 4 11% 46% 27%	270
October	1st to 10th	Day	7% 1 5% 24% 47% 16%	270
	11th to 20th	Day	11% 2 8% 24% 39% 17%	270
	21st to end	Day	14% 6% 19% 23% 35% 3	297
November	1st to 10th	Day	12% 1 12% 32% 36% 7%	270
	11th to 20th	Day	14% 6% 14% 35% 25% 6%	270
	21st to end	Day	18% 7% 26% 31% 15% 2	270
December	1st to 10th	Day	19% 7% 13% 34% 21% 7%	270
	11th to 20th	Day	22% 6% 26% 31% 15%	270
	21st to end	Day	21% 3 23% 33% 19% 1	297
January	1st to 10th	Night	21% 7% 24% 33% 15% 1	950
	11th to 20th	Night	19% 6% 26% 35% 14% 1	950
	21st to end	Night	21% 7% 26% 33% 13%	1045
February	1st to 10th	Night	23% 5% 26% 34% 12%	906
	11th to 20th	Night	24% 8% 22% 32% 14%	663
	21st to end	Night	25% 8% 23% 35% 9%	444
March	1st to 10th	Night	19% 4 26% 34% 16% 1	540
	11th to 20th	Night	16% 7% 23% 34% 18% 1	540
	21st to end	Night	13% 5% 21% 40% 19% 3	594
April	1st to 10th	Night	15% 5% 23% 40% 16%	540
	11th to 20th	Night	15% 7% 22% 35% 20%	533
	21st to end	Night	11% 5% 22% 41% 20% 1	540
May	1st to 10th	Night	12% 4 19% 43% 22%	540
	11th to 20th	Night	10% 2 15% 43% 27% 4	531
	21st to end	Night	6% 1 10% 35% 42% 5%	584
June	1st to 10th	Night	5% 1 4 26% 56% 8%	540
	11th to 20th	Night	5% 1 3 23% 56% 12%	540
	21st to end	Night	6% 1 3 17% 51% 21%	540
July	1st to 10th	Night	7% 1 3 12% 48% 29%	525
	11th to 20th	Night	2 1 8% 46% 43%	522
	21st to end	Night	3 3 6% 57% 31%	591
August	1st to 10th	Night	1 1 6% 52% 39%	537
	11th to 20th	Night	4 1 1 5% 50% 39%	534
	21st to end	Night	8% 1 2 11% 46% 31%	594
September	1st to 10th	Night	7% 1 4 12% 46% 30%	540
	11th to 20th	Night	15% 1 5% 14% 45% 21%	540
	21st to end	Night	10% 1 7% 15% 51% 17%	540
October	1st to 10th	Night	6% 1 6% 24% 50% 14%	659
	11th to 20th	Night	9% 3 11% 28% 39% 9%	720
	21st to end	Night	11% 4 16% 29% 33% 7%	792
November	1st to 10th	Night	10% 2 12% 31% 38% 7%	740
	11th to 20th	Night	15% 4 17% 33% 30% 2	760
	21st to end	Night	14% 5% 22% 37% 19% 3	760
December	1st to 10th	Night	21% 6% 16% 31% 23% 3	916
	11th to 20th	Night	19% 6% 21% 37% 16% 1	950
	21st to end	Night	21% 7% 23% 33% 15% 1	1045

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