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 2024-11-04.

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% 6% 2 6% 4 4 5% 4 6% 8% 42%	100761
	Night	15% 6% 2 6% 4 4 4 4 5% 7% 43%	98170
Transparency	Day	39% 5% 12% 22% 17% 5%	104408
	Night	40% 5% 10% 21% 19% 5%	102662
Seeing	Day	17% 11% 26% 25% 16% 5%	15279
	Night	17% 9% 27% 30% 15% 2	25153

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% 5% 1 4 3 3 3 2 4 5% 52%	2836
	11th to 20th	Day	14% 7% 2 7% 3 3 3 3 4 4 50%	2840
	21st to end	Day	19% 9% 3 6% 3 3 3 3 4 6% 42%	3124
February	1st to 10th	Day	13% 7% 2 6% 4 3 4 4 6% 8% 43%	1710
	11th to 20th	Day	21% 6% 2 4 3 4 3 3 4 5% 45%	1729
	21st to end	Day	18% 8% 2 6% 5% 3 4 3 5% 7% 40%	1627
March	1st to 10th	Day	23% 9% 2 6% 4 4 4 3 4 6% 35%	3435
	11th to 20th	Day	11% 5% 2 5% 3 3 3 3 4 6% 55%	3480
	21st to end	Day	20% 6% 2 5% 4 4 3 3 4 6% 43%	3815
April	1st to 10th	Day	11% 5% 2 4 3 4 3 3 5% 7% 53%	2265
	11th to 20th	Day	11% 6% 2 4 5% 4 3 3 5% 8% 49%	2254
	21st to end	Day	15% 5% 2 6% 5% 4 4 3 5% 6% 44%	2280
May	1st to 10th	Day	10% 6% 3 9% 6% 5% 6% 4 8% 10% 34%	3921
	11th to 20th	Day	18% 7% 3 7% 5% 5% 5% 4 6% 8% 34%	4081
	21st to end	Day	9% 4 2 5% 3 4 4 5% 6% 9% 49%	4571
June	1st to 10th	Day	9% 5% 2 6% 6% 5% 6% 5% 7% 9% 40%	2660
	11th to 20th	Day	9% 4 2 5% 5% 4 6% 5% 7% 11% 42%	2660
	21st to end	Day	7% 5% 2 6% 6% 5% 6% 6% 8% 11% 38%	2620
July	1st to 10th	Day	6% 4 2 7% 6% 7% 7% 6% 9% 10% 36%	4120
	11th to 20th	Day	12% 7% 2 8% 5% 5% 5% 5% 8% 10% 32%	4120
	21st to end	Day	10% 7% 3 8% 6% 7% 7% 5% 8% 10% 29%	4466
August	1st to 10th	Day	17% 9% 3 9% 6% 5% 6% 5% 7% 10% 23%	4104
	11th to 20th	Day	9% 6% 2 8% 5% 5% 7% 4 7% 11% 34%	3827
	21st to end	Day	6% 5% 2 6% 4 4 5% 5% 7% 11% 46%	4180
September	1st to 10th	Day	10% 5% 3 6% 5% 4 5% 4 6% 8% 44%	2280
	11th to 20th	Day	15% 6% 2 8% 5% 4 5% 3 5% 7% 41%	2252
	21st to end	Day	20% 7% 3 7% 4 4 4 3 5% 7% 36%	1995
October	1st to 10th	Day	15% 6% 2 5% 4 4 4 3 5% 6% 46%	1900
	11th to 20th	Day	14% 6% 2 4 3 3 3 2 3 6% 54%	1900
	21st to end	Day	12% 5% 2 6% 3 3 4 2 3 5% 55%	2090
November	1st to 10th	Day	13% 5% 1 5% 3 3 3 3 4 6% 54%	1887
	11th to 20th	Day	14% 6% 2 4 4 3 3 3 5% 5% 51%	1797
	21st to end	Day	15% 5% 2 4 3 4 3 3 5% 6% 52%	1570
December	1st to 10th	Day	17% 7% 3 5% 5% 4 4 3 5% 8% 40%	1520
	11th to 20th	Day	15% 5% 2 5% 3 3 3 3 3 6% 54%	1910
	21st to end	Day	16% 7% 3 6% 3 3 4 3 6% 7% 43%	2935
January	1st to 10th	Night	14% 6% 2 5% 4 4 4 4 5% 6% 46%	4109
	11th to 20th	Night	16% 8% 2 6% 3 3 3 4 4 5% 45%	4120
	21st to end	Night	20% 6% 2 6% 3 4 4 3 4 4 44%	4532
February	1st to 10th	Night	17% 7% 2 5% 3 3 4 3 5% 7% 44%	2470
	11th to 20th	Night	19% 7% 2 6% 4 4 4 3 4 5% 42%	2335
	21st to end	Night	14% 8% 2 5% 3 4 3 3 5% 5% 46%	1823
March	1st to 10th	Night	25% 8% 2 6% 4 4 5% 3 4 5% 34%	3418
	11th to 20th	Night	13% 6% 2 5% 3 3 3 3 4 6% 51%	3480
	21st to end	Night	17% 5% 2 4 3 2 3 2 4 6% 51%	3817
April	1st to 10th	Night	14% 6% 2 6% 5% 4 3 3 4 7% 48%	1914
	11th to 20th	Night	13% 5% 1 4 4 4 3 3 5% 7% 50%	1875
	21st to end	Night	12% 5% 1 5% 4 5% 4 4 5% 7% 48%	1900
May	1st to 10th	Night	13% 8% 3 8% 4 4 4 4 6% 7% 39%	2988
	11th to 20th	Night	23% 7% 2 6% 4 4 4 5% 4 6% 36%	2812
	21st to end	Night	10% 5% 2 5% 4 4 5% 4 6% 9% 47%	2966
June	1st to 10th	Night	9% 5% 2 6% 5% 5% 5% 5% 9% 10% 39%	1520
	11th to 20th	Night	9% 5% 2 7% 5% 5% 5% 4 7% 10% 40%	1520
	21st to end	Night	8% 5% 2 5% 5% 5% 6% 5% 9% 10% 40%	1551
July	1st to 10th	Night	7% 5% 2 7% 5% 5% 6% 6% 8% 11% 37%	2840
	11th to 20th	Night	13% 7% 3 8% 5% 5% 5% 4 6% 10% 33%	2840
	21st to end	Night	14% 10% 4 9% 5% 5% 5% 5% 6% 7% 29%	3087
August	1st to 10th	Night	21% 8% 3 8% 6% 5% 5% 5% 7% 8% 24%	2825
	11th to 20th	Night	8% 7% 3 8% 5% 5% 6% 5% 7% 10% 37%	2967
	21st to end	Night	7% 5% 2 5% 5% 4 5% 4 8% 11% 44%	3476
September	1st to 10th	Night	11% 5% 2 7% 3 4 3 4 5% 9% 47%	1900
	11th to 20th	Night	14% 8% 2 7% 4 4 4 4 6% 6% 43%	1924
	21st to end	Night	21% 8% 3 6% 4 4 4 4 4 6% 36%	2183
October	1st to 10th	Night	15% 6% 2 6% 4 4 3 4 5% 6% 47%	2280
	11th to 20th	Night	12% 6% 2 5% 4 3 3 2 3 6% 54%	2280
	21st to end	Night	12% 4 2 4 3 3 3 3 5% 6% 54%	2508
November	1st to 10th	Night	13% 6% 2 5% 4 3 3 3 4 5% 51%	2264
	11th to 20th	Night	14% 5% 3 4 4 4 3 3 5% 6% 50%	2379
	21st to end	Night	13% 5% 1 5% 4 4 4 3 4 6% 51%	2607
December	1st to 10th	Night	18% 7% 2 6% 4 4 4 3 4 6% 42%	2660
	11th to 20th	Night	18% 5% 2 6% 3 3 3 3 4 6% 48%	3285
	21st to end	Night	16% 7% 2 5% 3 4 3 3 5% 6% 45%	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	50% 4 8% 18% 13% 7%	3435
	11th to 20th	Day	31% 3 9% 21% 23% 12%	3480
	21st to end	Day	43% 4 10% 21% 17% 4	3815
April	1st to 10th	Day	32% 4 10% 24% 22% 7%	2265
	11th to 20th	Day	34% 4 12% 23% 21% 6%	2254
	21st to end	Day	41% 4 12% 23% 16% 4	2280
May	1st to 10th	Day	44% 6% 18% 19% 11% 2	3956
	11th to 20th	Day	48% 5% 12% 23% 11% 1	4085
	21st to end	Day	31% 6% 16% 26% 19% 2	4585
June	1st to 10th	Day	38% 8% 14% 24% 15% 2	2660
	11th to 20th	Day	34% 7% 17% 26% 14% 2	2660
	21st to end	Day	35% 10% 16% 22% 15% 1	2620
July	1st to 10th	Day	39% 7% 19% 21% 10% 3	4055
	11th to 20th	Day	46% 7% 23% 17% 6% 1	4051
	21st to end	Day	48% 8% 15% 17% 12%	4324
August	1st to 10th	Day	55% 6% 18% 16% 4	4091
	11th to 20th	Day	44% 5% 15% 25% 9% 1	3866
	21st to end	Day	33% 5% 15% 30% 15% 2	4180
September	1st to 10th	Day	37% 7% 15% 17% 19% 4	2280
	11th to 20th	Day	41% 6% 10% 22% 19% 2	2252
	21st to end	Day	48% 4 10% 20% 14% 4	1995
October	1st to 10th	Day	38% 3 6% 21% 26% 6%	3160
	11th to 20th	Day	23% 2 5% 20% 31% 20%	3140
	21st to end	Day	24% 2 6% 27% 27% 14%	3428
November	1st to 10th	Day	33% 3 8% 24% 27% 5%	1887
	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	54% 4 8% 15% 15% 4	3418
	11th to 20th	Night	36% 3 7% 15% 23% 15%	3480
	21st to end	Night	37% 3 8% 26% 21% 5%	3817
April	1st to 10th	Night	38% 5% 9% 17% 25% 7%	1914
	11th to 20th	Night	35% 4 10% 23% 22% 6%	1875
	21st to end	Night	36% 5% 11% 27% 18% 4	1900
May	1st to 10th	Night	43% 6% 15% 22% 13% 2	3018
	11th to 20th	Night	48% 7% 9% 20% 14% 1	2813
	21st to end	Night	32% 7% 17% 24% 18% 2	2973
June	1st to 10th	Night	36% 9% 15% 22% 16% 1	1520
	11th to 20th	Night	37% 9% 17% 19% 16% 2	1520
	21st to end	Night	36% 9% 14% 23% 16% 2	1551
July	1st to 10th	Night	38% 10% 20% 19% 11% 2	2795
	11th to 20th	Night	46% 7% 22% 17% 5% 2	2786
	21st to end	Night	53% 8% 12% 16% 11%	2988
August	1st to 10th	Night	56% 5% 18% 15% 5% 1	2814
	11th to 20th	Night	41% 6% 20% 22% 9% 1	2994
	21st to end	Night	33% 5% 13% 29% 19% 1	3476
September	1st to 10th	Night	34% 8% 16% 20% 17% 5%	1900
	11th to 20th	Night	41% 6% 11% 20% 21% 2	1924
	21st to end	Night	49% 5% 11% 16% 15% 3	2183
October	1st to 10th	Night	41% 4 7% 20% 24% 4	3800
	11th to 20th	Night	25% 2 5% 18% 29% 20%	3779
	21st to end	Night	23% 2 6% 30% 23% 15%	4120
November	1st to 10th	Night	37% 3 8% 21% 27% 5%	2264
	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% 38% 18% 5% 2	506
April	1st to 10th	Day	22% 18% 32% 20% 6% 1	460
	11th to 20th	Day	16% 18% 31% 23% 10% 3	452
	21st to end	Day	19% 12% 31% 27% 10% 1	460
May	1st to 10th	Day	14% 13% 38% 22% 11% 2	463
	11th to 20th	Day	17% 8% 27% 30% 14% 4	487
	21st to end	Day	18% 6% 20% 26% 23% 7%	529
June	1st to 10th	Day	11% 5% 25% 32% 21% 6%	490
	11th to 20th	Day	10% 5% 22% 32% 24% 8%	490
	21st to end	Day	9% 4 19% 36% 25% 7%	490
July	1st to 10th	Day	11% 2 10% 33% 33% 11%	485
	11th to 20th	Day	8% 2 11% 32% 36% 11%	484
	21st to end	Day	10% 2 17% 35% 27% 8%	532
August	1st to 10th	Day	14% 4 18% 31% 24% 10%	486
	11th to 20th	Day	12% 3 17% 26% 30% 11%	479
	21st to end	Day	9% 2 14% 31% 27% 17%	539
September	1st to 10th	Day	13% 3 16% 28% 24% 16%	490
	11th to 20th	Day	16% 4 14% 30% 25% 11%	490
	21st to end	Day	25% 7% 22% 28% 15% 4	490
October	1st to 10th	Day	19% 7% 21% 23% 22% 8%	490
	11th to 20th	Day	13% 11% 27% 28% 17% 4	490
	21st to end	Day	14% 10% 29% 26% 16% 5%	539
November	1st to 10th	Day	18% 10% 30% 23% 15% 4	467
	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% 40% 22% 6%	836
April	1st to 10th	Night	18% 16% 35% 27% 4	760
	11th to 20th	Night	17% 11% 35% 28% 9%	751
	21st to end	Night	14% 8% 38% 32% 7%	760
May	1st to 10th	Night	14% 12% 34% 30% 10%	683
	11th to 20th	Night	19% 5% 25% 37% 12% 1	561
	21st to end	Night	14% 2 21% 37% 26% 1	555
June	1st to 10th	Night	10% 3 22% 41% 22% 1	380
	11th to 20th	Night	10% 3 16% 45% 24% 3	380
	21st to end	Night	9% 2 16% 47% 24% 2	411
July	1st to 10th	Night	9% 2 14% 39% 33% 3	555
	11th to 20th	Night	9% 1 10% 41% 34% 6%	552
	21st to end	Night	9% 2 15% 42% 28% 4	624
August	1st to 10th	Night	14% 2 10% 40% 30% 3	567
	11th to 20th	Night	13% 3 12% 37% 33% 4	668
	21st to end	Night	13% 2 12% 33% 36% 5%	836
September	1st to 10th	Night	13% 2 13% 33% 34% 5%	760
	11th to 20th	Night	18% 4 16% 29% 29% 4	760
	21st to end	Night	26% 3 20% 31% 19% 2	760
October	1st to 10th	Night	17% 4 18% 31% 24% 5%	760
	11th to 20th	Night	16% 8% 26% 30% 18% 2	760
	21st to end	Night	15% 8% 27% 29% 19% 2	836
November	1st to 10th	Night	17% 6% 30% 30% 15% 2	755
	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 2024-11-01 22:47:35. Version ac07

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