Odessa/Midland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Odessa/Midland clear sky chart from 2005-11-06 to 2024-11-03.

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	6% 4 1 4 3 3 3 3 5% 7% 63%	100812
	Night	5% 3 1 3 3 3 3 3 5% 7% 64%	98372
Transparency	Day	22% 4 8% 20% 27% 19%	100588
	Night	20% 4 8% 21% 27% 20%	98187
Seeing	Day	7% 4 21% 34% 26% 8%	14942
	Night	7% 5% 31% 42% 15% 1	24904

By Month

Percentage Cloud Cover SW (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	6% 5% 2 4 3 2 2 2 3 5% 67%	2848
	11th to 20th	Day	4 3 1 3 2 2 2 1 3 5% 75%	3170
	21st to end	Day	5% 5% 2 4 3 3 4 3 5% 7% 59%	3487
February	1st to 10th	Day	4 4 2 4 3 3 3 2 5% 7% 62%	1900
	11th to 20th	Day	6% 5% 1 4 3 2 4 3 5% 7% 59%	1849
	21st to end	Day	7% 6% 1 5% 3 2 3 3 4 6% 62%	1570
March	1st to 10th	Day	5% 5% 2 4 3 3 3 4 6% 6% 59%	3130
	11th to 20th	Day	17% 7% 2 5% 3 3 3 3 4 5% 49%	3311
	21st to end	Day	3 4 1 4 4 4 4 4 6% 6% 60%	4036
April	1st to 10th	Day	5% 2 1 4 3 2 3 3 5% 7% 65%	2280
	11th to 20th	Day	8% 4 2 2 2 2 2 3 3 6% 65%	2251
	21st to end	Day	5% 3 3 2 2 2 3 4 5% 71%	2280
May	1st to 10th	Day	7% 4 1 4 3 2 2 2 3 5% 67%	3896
	11th to 20th	Day	8% 3 1 3 3 2 4 3 5% 5% 62%	4082
	21st to end	Day	6% 3 1 3 2 3 3 3 5% 7% 65%	4489
June	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 8% 66%	2470
	11th to 20th	Day	3 2 1 3 2 3 2 3 5% 7% 68%	2470
	21st to end	Day	5% 3 1 3 3 3 3 3 5% 7% 64%	2470
July	1st to 10th	Day	4 3 1 5% 4 4 4 4 6% 9% 56%	4120
	11th to 20th	Day	2 2 1 3 3 3 3 3 5% 7% 69%	4120
	21st to end	Day	4 3 1 4 3 3 3 4 5% 8% 61%	4118
August	1st to 10th	Day	1 1 1 2 2 2 2 2 4 8% 74%	3784
	11th to 20th	Day	3 2 1 3 3 3 3 4 6% 8% 64%	3726
	21st to end	Day	4 3 1 5% 4 4 5% 4 6% 9% 55%	4180
September	1st to 10th	Day	9% 4 1 5% 4 4 5% 4 5% 8% 52%	2264
	11th to 20th	Day	9% 6% 2 6% 5% 4 4 4 5% 7% 49%	2090
	21st to end	Day	8% 4 2 4 3 3 4 3 3 6% 60%	2090
October	1st to 10th	Day	5% 4 1 4 3 3 2 3 5% 6% 65%	2090
	11th to 20th	Day	8% 3 1 3 2 2 2 2 3 4 69%	2090
	21st to end	Day	7% 3 1 3 2 1 2 1 3 4 73%	2034
November	1st to 10th	Day	7% 4 1 3 2 2 1 2 4 5% 69%	1691
	11th to 20th	Day	4 4 1 4 2 2 2 3 4 6% 67%	1710
	21st to end	Day	9% 4 1 3 3 2 4 3 4 6% 62%	1710
December	1st to 10th	Day	9% 5% 1 4 2 2 3 3 4 6% 60%	1710
	11th to 20th	Day	4 5% 1 5% 4 4 4 4 5% 7% 58%	2161
	21st to end	Day	7% 4 2 4 2 2 3 2 3 4 68%	3135
January	1st to 10th	Night	4 3 1 3 2 2 3 3 4 7% 68%	4108
	11th to 20th	Night	4 3 1 2 2 2 2 3 4 6% 70%	3828
	21st to end	Night	7% 5% 2 5% 3 3 3 3 5% 7% 58%	4180
February	1st to 10th	Night	6% 4 1 4 3 3 3 3 5% 7% 63%	2280
	11th to 20th	Night	7% 5% 2 5% 4 3 4 3 5% 6% 57%	2218
	21st to end	Night	5% 5% 1 3 3 3 4 2 4 5% 64%	1884
March	1st to 10th	Night	5% 6% 2 3 3 3 2 2 4 5% 64%	3734
	11th to 20th	Night	12% 5% 2 5% 4 3 5% 3 5% 6% 51%	3653
	21st to end	Night	3 4 1 3 3 4 4 3 6% 8% 61%	3584
April	1st to 10th	Night	5% 3 1 3 2 3 4 3 5% 7% 63%	1900
	11th to 20th	Night	6% 3 1 4 2 3 3 2 6% 7% 62%	1877
	21st to end	Night	5% 3 1 2 2 2 2 2 4 4 72%	1900
May	1st to 10th	Night	8% 5% 1 3 2 2 3 2 4 5% 66%	3060
	11th to 20th	Night	7% 3 1 2 2 2 3 3 4 6% 67%	2823
	21st to end	Night	3 3 1 3 2 2 4 3 6% 8% 66%	3098
June	1st to 10th	Night	2 2 1 3 2 3 3 4 7% 10% 65%	1710
	11th to 20th	Night	1 1 1 3 3 3 5% 4 7% 9% 64%	1710
	21st to end	Night	2 2 1 3 2 2 3 4 6% 9% 65%	1710
July	1st to 10th	Night	3 3 1 4 3 3 4 4 7% 10% 59%	2850
	11th to 20th	Night	1 2 1 2 3 3 3 3 5% 11% 67%	2850
	21st to end	Night	4 3 1 3 3 3 3 3 5% 9% 65%	3439
August	1st to 10th	Night	2 1 1 2 2 3 3 3 4 7% 73%	3155
	11th to 20th	Night	2 2 1 3 3 3 4 3 6% 10% 63%	3113
	21st to end	Night	4 2 1 3 2 3 3 3 5% 10% 63%	3487
September	1st to 10th	Night	8% 4 1 4 3 4 3 3 5% 8% 57%	1914
	11th to 20th	Night	7% 3 1 4 3 4 4 4 6% 9% 54%	2090
	21st to end	Night	8% 4 1 3 2 3 3 3 6% 9% 59%	2090
October	1st to 10th	Night	5% 3 1 3 3 3 4 3 6% 6% 63%	2090
	11th to 20th	Night	8% 3 1 2 1 2 2 2 3 4 71%	2090
	21st to end	Night	7% 4 1 2 2 2 2 2 3 3 72%	2537
November	1st to 10th	Night	7% 4 1 3 2 2 2 2 4 5% 69%	2432
	11th to 20th	Night	3 3 2 4 2 3 3 4 5% 6% 66%	2470
	21st to end	Night	8% 4 2 4 3 2 3 3 4 6% 62%	2470
December	1st to 10th	Night	8% 4 1 3 3 2 3 3 5% 6% 61%	2470
	11th to 20th	Night	5% 5% 2 4 3 4 3 3 5% 6% 60%	3036
	21st to end	Night	5% 5% 2 4 3 3 3 3 4 5% 65%	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	21% 3 3 15% 39% 19%	2849
	11th to 20th	Day	15% 2 7% 19% 38% 19%	3170
	21st to end	Day	25% 4 7% 20% 31% 13%	3487
February	1st to 10th	Day	23% 3 5% 15% 27% 26%	1900
	11th to 20th	Day	25% 3 6% 20% 23% 23%	1859
	21st to end	Day	26% 2 3 10% 29% 29%	1570
March	1st to 10th	Day	24% 3 5% 11% 26% 32%	3130
	11th to 20th	Day	38% 5% 5% 12% 25% 16%	3311
	21st to end	Day	21% 4 6% 14% 26% 29%	4036
April	1st to 10th	Day	19% 3 6% 14% 27% 32%	2280
	11th to 20th	Day	22% 2 6% 12% 29% 29%	2254
	21st to end	Day	16% 3 6% 19% 27% 29%	2280
May	1st to 10th	Day	22% 3 5% 12% 18% 40%	3896
	11th to 20th	Day	22% 6% 7% 15% 24% 25%	4086
	21st to end	Day	18% 5% 7% 19% 20% 32%	4489
June	1st to 10th	Day	16% 5% 11% 30% 25% 14%	2470
	11th to 20th	Day	17% 4 8% 22% 31% 18%	2470
	21st to end	Day	19% 5% 9% 23% 27% 17%	2470
July	1st to 10th	Day	24% 5% 13% 31% 20% 6%	4056
	11th to 20th	Day	15% 5% 11% 33% 30% 7%	4051
	21st to end	Day	19% 5% 10% 30% 29% 7%	3988
August	1st to 10th	Day	10% 3 9% 33% 37% 9%	3772
	11th to 20th	Day	17% 5% 12% 29% 33% 5%	3762
	21st to end	Day	25% 7% 15% 23% 26% 5%	4179
September	1st to 10th	Day	30% 5% 11% 20% 23% 12%	2264
	11th to 20th	Day	34% 5% 9% 21% 22% 9%	2090
	21st to end	Day	25% 4 6% 19% 29% 17%	2090
October	1st to 10th	Day	22% 3 9% 21% 22% 22%	2090
	11th to 20th	Day	22% 2 5% 16% 28% 27%	2090
	21st to end	Day	18% 2 3 18% 35% 24%	2034
November	1st to 10th	Day	20% 2 6% 21% 28% 24%	1691
	11th to 20th	Day	20% 2 7% 19% 30% 21%	1710
	21st to end	Day	25% 3 4 18% 28% 21%	1710
December	1st to 10th	Day	27% 3 6% 19% 30% 15%	1710
	11th to 20th	Day	26% 3 7% 19% 24% 20%	2159
	21st to end	Day	22% 2 3 18% 32% 22%	3135
January	1st to 10th	Night	16% 3 4 17% 40% 19%	4108
	11th to 20th	Night	16% 3 7% 20% 31% 23%	3828
	21st to end	Night	26% 4 6% 21% 28% 16%	4180
February	1st to 10th	Night	22% 3 6% 16% 26% 28%	2280
	11th to 20th	Night	28% 3 5% 16% 23% 25%	2218
	21st to end	Night	23% 3 4 10% 26% 34%	1884
March	1st to 10th	Night	23% 2 4 10% 24% 36%	3734
	11th to 20th	Night	33% 5% 7% 15% 20% 20%	3653
	21st to end	Night	19% 5% 8% 17% 26% 25%	3584
April	1st to 10th	Night	20% 4 8% 16% 23% 29%	1900
	11th to 20th	Night	21% 4 8% 16% 23% 27%	1877
	21st to end	Night	17% 3 7% 22% 26% 24%	1900
May	1st to 10th	Night	22% 3 8% 17% 18% 31%	3060
	11th to 20th	Night	18% 6% 12% 20% 17% 27%	2824
	21st to end	Night	15% 6% 11% 21% 18% 30%	3099
June	1st to 10th	Night	13% 6% 15% 32% 24% 10%	1710
	11th to 20th	Night	15% 5% 13% 23% 29% 16%	1710
	21st to end	Night	15% 5% 12% 25% 27% 16%	1710
July	1st to 10th	Night	18% 6% 15% 39% 18% 3	2805
	11th to 20th	Night	12% 4 11% 36% 30% 7%	2796
	21st to end	Night	18% 4 11% 29% 32% 7%	3331
August	1st to 10th	Night	12% 4 8% 26% 41% 10%	3144
	11th to 20th	Night	16% 4 12% 32% 30% 5%	3143
	21st to end	Night	17% 6% 17% 29% 26% 6%	3487
September	1st to 10th	Night	26% 4 11% 24% 22% 12%	1914
	11th to 20th	Night	25% 7% 14% 22% 24% 8%	2090
	21st to end	Night	23% 4 8% 23% 23% 20%	2090
October	1st to 10th	Night	20% 6% 12% 22% 19% 22%	2090
	11th to 20th	Night	19% 2 7% 16% 27% 29%	2090
	21st to end	Night	19% 3 5% 16% 33% 26%	2537
November	1st to 10th	Night	20% 2 5% 22% 27% 24%	2432
	11th to 20th	Night	19% 4 6% 19% 29% 24%	2470
	21st to end	Night	25% 3 5% 15% 28% 24%	2470
December	1st to 10th	Night	24% 3 4 20% 28% 20%	2470
	11th to 20th	Night	26% 2 5% 19% 26% 21%	3037
	21st to end	Night	22% 3 4 15% 33% 23%	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	11% 6% 35% 36% 12% 1	270
	11th to 20th	Day	7% 7% 35% 32% 16% 2	270
	21st to end	Day	11% 7% 30% 36% 12% 3	297
February	1st to 10th	Day	10% 3 36% 35% 14% 1	270
	11th to 20th	Day	10% 5% 42% 29% 12% 1	270
	21st to end	Day	12% 8% 40% 32% 8%	225
March	1st to 10th	Day	11% 4 38% 37% 9% 1	270
	11th to 20th	Day	13% 9% 31% 31% 14% 3	270
	21st to end	Day	5% 12% 41% 33% 8% 1	429
April	1st to 10th	Day	6% 8% 42% 33% 8% 2	460
	11th to 20th	Day	12% 9% 43% 28% 8%	452
	21st to end	Day	5% 10% 36% 35% 12% 2	460
May	1st to 10th	Day	5% 7% 37% 36% 13% 3	520
	11th to 20th	Day	9% 3 29% 37% 18% 4	675
	21st to end	Day	10% 4 29% 41% 14% 1	734
June	1st to 10th	Day	4 2 15% 48% 25% 6%	680
	11th to 20th	Day	3 1 19% 45% 28% 4	680
	21st to end	Day	5% 1 9% 36% 40% 9%	680
July	1st to 10th	Day	6% 1 5% 33% 39% 17%	671
	11th to 20th	Day	2 1 2 35% 47% 13%	668
	21st to end	Day	3 1 2 26% 45% 23%	531
August	1st to 10th	Day	2 1 2 24% 52% 19%	487
	11th to 20th	Day	5% 1 4 27% 44% 19%	477
	21st to end	Day	5% 1 2 25% 46% 21%	539
September	1st to 10th	Day	8% 5% 27% 38% 22%	474
	11th to 20th	Day	4 1 4 28% 43% 20%	300
	21st to end	Day	10% 1 10% 21% 41% 18%	300
October	1st to 10th	Day	6% 1 13% 35% 34% 12%	300
	11th to 20th	Day	10% 1 16% 34% 32% 7%	300
	21st to end	Day	11% 2 22% 33% 21% 10%	330
November	1st to 10th	Day	13% 2 26% 30% 24% 5%	276
	11th to 20th	Day	10% 6% 20% 34% 21% 8%	270
	21st to end	Day	11% 7% 37% 26% 14% 6%	270
December	1st to 10th	Day	13% 4 23% 39% 16% 5%	270
	11th to 20th	Day	7% 9% 36% 34% 14% 1	270
	21st to end	Day	11% 7% 37% 33% 11% 1	297
January	1st to 10th	Night	8% 5% 37% 40% 10%	950
	11th to 20th	Night	10% 8% 30% 42% 9% 1	775
	21st to end	Night	8% 7% 38% 38% 9%	836
February	1st to 10th	Night	9% 6% 40% 35% 9%	760
	11th to 20th	Night	10% 6% 49% 30% 5%	744
	21st to end	Night	9% 12% 47% 28% 4	628
March	1st to 10th	Night	10% 9% 45% 33% 3	760
	11th to 20th	Night	9% 10% 42% 32% 6% 1	678
	21st to end	Night	5% 12% 52% 28% 2	627
April	1st to 10th	Night	6% 10% 50% 30% 3	570
	11th to 20th	Night	7% 10% 54% 28% 2	563
	21st to end	Night	4 13% 50% 29% 4	570
May	1st to 10th	Night	7% 6% 46% 38% 2	570
	11th to 20th	Night	7% 6% 38% 41% 8% 1	561
	21st to end	Night	6% 3 44% 40% 7%	617
June	1st to 10th	Night	3 1 31% 55% 10%	570
	11th to 20th	Night	2 2 37% 51% 8%	570
	21st to end	Night	3 22% 55% 20% 1	570
July	1st to 10th	Night	4 9% 55% 30% 2	555
	11th to 20th	Night	3 7% 59% 30% 1	552
	21st to end	Night	2 1 5% 56% 35% 1	624
August	1st to 10th	Night	2 1 4 54% 38% 1	567
	11th to 20th	Night	5% 1 5% 46% 40% 2	564
	21st to end	Night	3 1 5% 43% 44% 3	627
September	1st to 10th	Night	9% 1 5% 46% 37% 3	570
	11th to 20th	Night	7% 10% 51% 31% 1	570
	21st to end	Night	9% 1 12% 51% 26% 1	570
October	1st to 10th	Night	5% 2 24% 48% 20% 1	570
	11th to 20th	Night	11% 4 28% 45% 12% 1	570
	21st to end	Night	9% 5% 28% 37% 20% 2	865
November	1st to 10th	Night	10% 3 25% 43% 18% 1	936
	11th to 20th	Night	5% 4 28% 45% 17% 1	950
	21st to end	Night	10% 5% 32% 38% 13% 1	950
December	1st to 10th	Night	11% 3 30% 44% 11% 1	950
	11th to 20th	Night	9% 7% 34% 42% 8%	950
	21st to end	Night	8% 7% 35% 39% 10% 1	1045

Page generated at 2024-10-31 02:39:22. Version ac07

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