Medoc Mountain State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Medoc Mountain State Park clear sky chart from 2005-11-06 to 2024-03-23.

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	13% 5% 2 5% 5% 3 5% 5% 5% 8% 43%	78807
	Night	14% 6% 2 5% 5% 3 4 4 5% 7% 45%	81065
Transparency	Day	39% 6% 12% 22% 18% 4	78528
	Night	39% 5% 10% 21% 20% 5%	80863
Seeing	Day	17% 11% 26% 24% 16% 5%	14375
	Night	17% 9% 27% 30% 15% 2	24380

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% 5% 2 3 4 2 3 3 3 5% 52%	2836
	11th to 20th	Day	14% 6% 2 6% 3 2 4 3 4 5% 50%	2840
	21st to end	Day	19% 8% 3 5% 4 2 3 3 4 6% 42%	3124
February	1st to 10th	Day	14% 6% 3 5% 5% 3 4 5% 5% 8% 43%	1710
	11th to 20th	Day	21% 5% 2 4 3 2 4 4 4 5% 45%	1729
	21st to end	Day	18% 7% 3 5% 6% 2 4 4 5% 7% 40%	1627
March	1st to 10th	Day	16% 6% 2 4 3 3 4 4 4 6% 49%	2090
	11th to 20th	Day	16% 6% 3 5% 5% 2 3 4 5% 7% 44%	2090
	21st to end	Day	17% 7% 2 6% 6% 3 4 5% 4 6% 40%	2200
April	1st to 10th	Day	12% 5% 2 3 4 2 4 4 4 7% 54%	2145
	11th to 20th	Day	11% 5% 2 3 5% 3 4 4 5% 9% 49%	2134
	21st to end	Day	15% 5% 3 5% 5% 3 5% 5% 5% 6% 44%	2160
May	1st to 10th	Day	12% 5% 2 6% 5% 3 5% 5% 7% 9% 42%	2246
	11th to 20th	Day	15% 6% 3 5% 5% 4 6% 4 5% 7% 40%	2301
	21st to end	Day	13% 5% 2 5% 5% 4 5% 6% 6% 8% 40%	2585
June	1st to 10th	Day	10% 5% 3 5% 6% 4 6% 6% 6% 9% 40%	2520
	11th to 20th	Day	9% 4 3 4 6% 3 6% 6% 7% 11% 41%	2520
	21st to end	Day	7% 4 2 6% 7% 4 7% 7% 8% 11% 38%	2483
July	1st to 10th	Day	9% 5% 3 5% 6% 4 7% 8% 7% 11% 36%	2340
	11th to 20th	Day	7% 6% 2 5% 6% 3 5% 7% 8% 13% 37%	2340
	21st to end	Day	8% 4 2 5% 7% 5% 7% 8% 9% 11% 35%	2547
August	1st to 10th	Day	10% 6% 2 6% 7% 4 6% 7% 7% 11% 33%	2327
	11th to 20th	Day	12% 6% 3 7% 6% 4 6% 6% 7% 10% 34%	2184
	21st to end	Day	9% 6% 3 7% 6% 4 6% 6% 6% 10% 37%	2376
September	1st to 10th	Day	10% 4 3 5% 6% 4 5% 5% 7% 8% 43%	2160
	11th to 20th	Day	14% 5% 2 6% 6% 3 5% 5% 5% 8% 43%	2134
	21st to end	Day	19% 7% 3 6% 5% 3 5% 4 5% 7% 37%	1890
October	1st to 10th	Day	16% 6% 2 4 5% 3 5% 3 5% 6% 46%	1800
	11th to 20th	Day	15% 5% 2 4 4 2 3 3 3 6% 52%	1800
	21st to end	Day	13% 5% 2 4 4 2 4 3 3 5% 54%	1980
November	1st to 10th	Day	13% 5% 1 4 4 2 4 3 4 6% 54%	1857
	11th to 20th	Day	14% 5% 2 4 4 2 3 3 4 6% 52%	1797
	21st to end	Day	15% 5% 2 4 3 2 4 3 5% 6% 52%	1570
December	1st to 10th	Day	18% 6% 3 5% 5% 3 4 4 4 8% 40%	1520
	11th to 20th	Day	15% 5% 2 4 3 2 3 3 3 6% 55%	1910
	21st to end	Day	16% 7% 3 5% 4 2 4 4 5% 7% 43%	2935
January	1st to 10th	Night	14% 6% 2 4 4 3 4 5% 5% 6% 47%	4109
	11th to 20th	Night	16% 7% 3 6% 4 2 3 5% 4 5% 45%	4120
	21st to end	Night	20% 6% 2 5% 4 3 4 3 4 4 44%	4532
February	1st to 10th	Night	17% 7% 2 5% 4 2 4 4 5% 7% 44%	2470
	11th to 20th	Night	19% 7% 3 5% 5% 3 4 3 4 5% 42%	2335
	21st to end	Night	15% 7% 3 5% 3 3 3 4 5% 5% 46%	1823
March	1st to 10th	Night	14% 5% 2 5% 4 3 4 4 4 6% 50%	2090
	11th to 20th	Night	16% 6% 3 5% 5% 3 4 4 5% 7% 42%	2090
	21st to end	Night	17% 6% 3 4 4 2 4 3 4 7% 45%	2201
April	1st to 10th	Night	15% 5% 2 5% 5% 3 4 3 4 7% 48%	1814
	11th to 20th	Night	13% 5% 2 4 4 3 4 3 5% 7% 50%	1775
	21st to end	Night	12% 4 2 4 4 4 5% 5% 5% 7% 48%	1800
May	1st to 10th	Night	12% 6% 3 5% 5% 2 4 5% 6% 8% 44%	1728
	11th to 20th	Night	15% 5% 2 5% 5% 3 5% 6% 5% 6% 42%	1592
	21st to end	Night	13% 5% 2 4 5% 4 5% 5% 6% 9% 43%	1686
June	1st to 10th	Night	10% 4 3 5% 5% 4 5% 6% 9% 10% 40%	1440
	11th to 20th	Night	10% 5% 2 7% 5% 4 5% 6% 7% 10% 40%	1440
	21st to end	Night	8% 5% 2 5% 6% 4 6% 6% 8% 10% 39%	1469
July	1st to 10th	Night	6% 5% 3 6% 6% 4 6% 6% 8% 11% 39%	1620
	11th to 20th	Night	6% 3 3 6% 6% 5% 6% 6% 8% 12% 39%	1620
	21st to end	Night	7% 5% 3 6% 6% 3 6% 7% 8% 11% 37%	1771
August	1st to 10th	Night	10% 6% 3 6% 7% 4 6% 6% 7% 10% 35%	1611
	11th to 20th	Night	10% 7% 3 7% 6% 3 6% 6% 7% 9% 36%	1696
	21st to end	Night	12% 5% 2 5% 6% 3 5% 6% 7% 11% 37%	1980
September	1st to 10th	Night	11% 5% 2 6% 4 3 4 5% 5% 10% 47%	1800
	11th to 20th	Night	12% 7% 3 6% 5% 3 3 4 5% 6% 45%	1822
	21st to end	Night	21% 8% 3 5% 5% 3 4 5% 4 6% 37%	2068
October	1st to 10th	Night	15% 5% 2 5% 5% 3 4 5% 5% 6% 47%	2160
	11th to 20th	Night	13% 6% 2 5% 4 2 3 3 3 6% 53%	2160
	21st to end	Night	12% 4 2 4 4 3 4 4 5% 6% 53%	2376
November	1st to 10th	Night	13% 6% 3 5% 4 2 3 3 4 5% 51%	2221
	11th to 20th	Night	14% 4 3 4 4 3 4 4 5% 6% 50%	2379
	21st to end	Night	13% 5% 1 5% 5% 3 3 4 4 6% 52%	2607
December	1st to 10th	Night	18% 6% 3 5% 5% 3 4 4 4 6% 42%	2660
	11th to 20th	Night	18% 5% 2 5% 3 2 3 4 4 7% 48%	3285
	21st to end	Night	16% 7% 2 5% 4 3 4 4 5% 6% 46%	4715

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	37% 2 5% 26% 24% 5%	2837
	11th to 20th	Day	37% 3 5% 19% 29% 6%	2840
	21st to end	Day	45% 4 7% 19% 18% 7%	3124
February	1st to 10th	Day	39% 4 11% 24% 18% 4	1710
	11th to 20th	Day	42% 4 7% 19% 22% 6%	1738
	21st to end	Day	45% 4 12% 15% 19% 6%	1627
March	1st to 10th	Day	37% 4 9% 24% 20% 6%	2090
	11th to 20th	Day	41% 4 9% 21% 17% 8%	2090
	21st to end	Day	46% 5% 10% 20% 16% 4	2200
April	1st to 10th	Day	31% 4 10% 25% 22% 7%	2145
	11th to 20th	Day	34% 4 12% 23% 21% 6%	2134
	21st to end	Day	41% 4 12% 22% 17% 4	2160
May	1st to 10th	Day	38% 6% 16% 21% 16% 3	2246
	11th to 20th	Day	44% 6% 13% 25% 12% 1	2305
	21st to end	Day	40% 7% 14% 27% 12%	2585
June	1st to 10th	Day	39% 8% 14% 24% 15% 2	2520
	11th to 20th	Day	35% 8% 17% 25% 13% 2	2520
	21st to end	Day	36% 11% 17% 20% 15% 1	2483
July	1st to 10th	Day	39% 10% 15% 22% 12% 3	2275
	11th to 20th	Day	36% 9% 21% 21% 10% 2	2271
	21st to end	Day	38% 10% 20% 21% 12%	2405
August	1st to 10th	Day	42% 10% 18% 23% 8% 1	2314
	11th to 20th	Day	44% 9% 16% 21% 9% 2	2184
	21st to end	Day	41% 8% 18% 20% 11% 3	2376
September	1st to 10th	Day	37% 8% 16% 18% 17% 4	2160
	11th to 20th	Day	40% 6% 10% 22% 20% 2	2134
	21st to end	Day	47% 4 10% 20% 15% 4	1890
October	1st to 10th	Day	39% 5% 9% 24% 19% 4	1800
	11th to 20th	Day	36% 3 8% 26% 22% 6%	1800
	21st to end	Day	35% 4 6% 22% 25% 8%	1980
November	1st to 10th	Day	33% 3 7% 24% 27% 5%	1857
	11th to 20th	Day	35% 3 10% 21% 24% 7%	1797
	21st to end	Day	35% 4 7% 23% 26% 6%	1570
December	1st to 10th	Day	43% 4 10% 21% 18% 4	1520
	11th to 20th	Day	34% 2 8% 27% 20% 8%	1906
	21st to end	Day	41% 4 10% 24% 19% 2	2935
January	1st to 10th	Night	38% 4 7% 21% 25% 5%	4109
	11th to 20th	Night	42% 4 7% 19% 24% 5%	4120
	21st to end	Night	45% 3 5% 19% 21% 7%	4532
February	1st to 10th	Night	41% 3 9% 21% 20% 5%	2470
	11th to 20th	Night	45% 3 7% 17% 20% 7%	2337
	21st to end	Night	40% 4 8% 22% 20% 7%	1823
March	1st to 10th	Night	38% 4 8% 22% 21% 7%	2090
	11th to 20th	Night	43% 3 9% 20% 18% 7%	2090
	21st to end	Night	40% 5% 10% 22% 19% 4	2201
April	1st to 10th	Night	38% 5% 8% 18% 25% 7%	1814
	11th to 20th	Night	35% 4 10% 23% 22% 6%	1775
	21st to end	Night	36% 4 11% 26% 18% 5%	1800
May	1st to 10th	Night	35% 7% 14% 23% 17% 3	1728
	11th to 20th	Night	42% 7% 13% 19% 17% 2	1593
	21st to end	Night	37% 8% 16% 25% 13% 1	1687
June	1st to 10th	Night	35% 9% 16% 22% 16% 1	1440
	11th to 20th	Night	38% 9% 18% 18% 15% 2	1440
	21st to end	Night	36% 10% 14% 21% 16% 3	1469
July	1st to 10th	Night	36% 10% 19% 21% 12% 2	1575
	11th to 20th	Night	34% 10% 20% 24% 8% 3	1566
	21st to end	Night	36% 11% 18% 23% 12%	1672
August	1st to 10th	Night	42% 9% 19% 20% 9% 1	1600
	11th to 20th	Night	41% 9% 19% 19% 10% 2	1696
	21st to end	Night	39% 8% 19% 22% 10% 2	1980
September	1st to 10th	Night	34% 8% 16% 21% 16% 5%	1800
	11th to 20th	Night	39% 6% 11% 21% 21% 3	1822
	21st to end	Night	48% 6% 11% 17% 15% 3	2068
October	1st to 10th	Night	37% 6% 8% 21% 23% 4	2160
	11th to 20th	Night	35% 4 8% 22% 25% 6%	2160
	21st to end	Night	32% 4 7% 22% 26% 9%	2376
November	1st to 10th	Night	37% 3 8% 20% 27% 6%	2221
	11th to 20th	Night	36% 4 8% 17% 24% 10%	2379
	21st to end	Night	35% 3 7% 22% 27% 6%	2607
December	1st to 10th	Night	45% 4 9% 19% 19% 4	2660
	11th to 20th	Night	38% 3 8% 21% 22% 7%	3288
	21st to end	Night	39% 4 8% 25% 21% 3	4715

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% 26% 35% 13% 3	270
	11th to 20th	Day	27% 27% 34% 10% 1	270
	21st to end	Day	22% 25% 40% 13% 1	297
February	1st to 10th	Day	20% 23% 39% 15% 4	270
	11th to 20th	Day	34% 23% 33% 9% 1	336
	21st to end	Day	28% 21% 31% 16% 4	382
March	1st to 10th	Day	22% 20% 35% 18% 4 1	460
	11th to 20th	Day	22% 20% 37% 15% 5% 1	460
	21st to end	Day	21% 17% 37% 19% 4 2	470
April	1st to 10th	Day	22% 16% 32% 22% 7% 1	420
	11th to 20th	Day	16% 18% 30% 23% 10% 3	412
	21st to end	Day	20% 12% 31% 26% 10% 1	420
May	1st to 10th	Day	15% 12% 39% 22% 10% 2	423
	11th to 20th	Day	17% 8% 26% 30% 16% 4	447
	21st to end	Day	19% 5% 19% 25% 24% 7%	485
June	1st to 10th	Day	12% 5% 24% 32% 22% 6%	450
	11th to 20th	Day	11% 5% 22% 30% 24% 9%	450
	21st to end	Day	9% 5% 20% 35% 26% 7%	450
July	1st to 10th	Day	11% 1 11% 33% 33% 11%	445
	11th to 20th	Day	8% 2 11% 31% 37% 11%	444
	21st to end	Day	10% 2 17% 35% 28% 8%	488
August	1st to 10th	Day	12% 4 17% 31% 25% 10%	446
	11th to 20th	Day	13% 4 15% 24% 32% 12%	439
	21st to end	Day	10% 2 15% 28% 27% 18%	495
September	1st to 10th	Day	13% 3 15% 26% 26% 17%	450
	11th to 20th	Day	14% 4 14% 31% 25% 12%	450
	21st to end	Day	23% 7% 22% 28% 15% 5%	450
October	1st to 10th	Day	20% 6% 22% 22% 22% 8%	450
	11th to 20th	Day	14% 10% 28% 27% 18% 4	450
	21st to end	Day	16% 11% 29% 26% 15% 4	495
November	1st to 10th	Day	18% 10% 30% 22% 16% 4	455
	11th to 20th	Day	18% 16% 29% 26% 10% 1	411
	21st to end	Day	23% 17% 23% 24% 10% 3	230
December	1st to 10th	Day	25% 15% 44% 9% 6% 1	180
	11th to 20th	Day	18% 18% 34% 23% 4 2	180
	21st to end	Day	25% 18% 29% 18% 9%	245
January	1st to 10th	Night	20% 17% 35% 23% 5%	760
	11th to 20th	Night	22% 15% 33% 25% 6%	760
	21st to end	Night	19% 14% 39% 25% 3	836
February	1st to 10th	Night	22% 14% 37% 23% 4	760
	11th to 20th	Night	24% 20% 40% 15% 2	743
	21st to end	Night	20% 16% 37% 25% 3	628
March	1st to 10th	Night	17% 17% 35% 27% 4	760
	11th to 20th	Night	21% 14% 37% 20% 7% 1	760
	21st to end	Night	20% 12% 39% 23% 6%	801
April	1st to 10th	Night	18% 15% 35% 28% 4	720
	11th to 20th	Night	17% 11% 34% 28% 9%	711
	21st to end	Night	15% 8% 38% 32% 8%	720
May	1st to 10th	Night	14% 12% 34% 31% 9%	648
	11th to 20th	Night	19% 5% 26% 37% 12% 1	531
	21st to end	Night	14% 2 19% 37% 26% 1	526
June	1st to 10th	Night	10% 3 22% 41% 23% 1	360
	11th to 20th	Night	10% 3 15% 44% 24% 3	360
	21st to end	Night	8% 3 15% 47% 24% 2	389
July	1st to 10th	Night	9% 2 14% 39% 33% 3	525
	11th to 20th	Night	8% 1 10% 41% 35% 6%	522
	21st to end	Night	8% 2 14% 43% 29% 4	591
August	1st to 10th	Night	13% 2 10% 41% 30% 3	537
	11th to 20th	Night	13% 3 11% 35% 34% 4	632
	21st to end	Night	13% 2 12% 32% 35% 6%	792
September	1st to 10th	Night	13% 2 13% 33% 35% 5%	720
	11th to 20th	Night	16% 4 16% 31% 29% 4	720
	21st to end	Night	25% 3 19% 31% 19% 2	720
October	1st to 10th	Night	16% 5% 19% 31% 24% 5%	720
	11th to 20th	Night	17% 8% 25% 29% 18% 2	720
	21st to end	Night	16% 9% 28% 28% 17% 2	792
November	1st to 10th	Night	17% 7% 29% 30% 15% 2	740
	11th to 20th	Night	16% 11% 30% 31% 11% 1	760
	21st to end	Night	15% 12% 29% 31% 13% 1	760
December	1st to 10th	Night	21% 13% 32% 25% 8%	760
	11th to 20th	Night	19% 11% 31% 34% 6%	760
	21st to end	Night	20% 14% 30% 31% 5%	836

Page generated at 2024-03-19 23:31:07. Version ac07

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