Caballo Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caballo Lake State Park clear sky chart from 2005-11-06 to 2024-12-24.

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	3 2 1 3 3 3 4 3 5% 7% 65%	104986
	Night	4 3 1 4 3 3 4 3 5% 7% 63%	103850
Transparency	Day	17% 4 6% 16% 28% 29%	104750
	Night	19% 4 6% 15% 28% 27%	103675
Seeing	Day	7% 10% 21% 30% 23% 9%	14508
	Night	5% 4 20% 42% 26% 3	24850

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	2 3 1 3 3 3 4 4 6% 7% 66%	2858
	11th to 20th	Day	2 2 1 2 2 2 3 3 5% 6% 71%	2860
	21st to end	Day	6% 4 1 4 2 3 4 3 6% 7% 58%	3146
February	1st to 10th	Day	2 3 1 4 2 3 3 2 4 6% 70%	1714
	11th to 20th	Day	4 3 1 4 3 3 2 2 3 6% 68%	1849
	21st to end	Day	2 3 1 3 2 2 3 3 5% 5% 71%	1622
March	1st to 10th	Day	2 4 1 4 3 3 3 2 4 6% 68%	3444
	11th to 20th	Day	8% 4 1 5% 3 3 4 3 4 5% 58%	3490
	21st to end	Day	1 4 2 5% 3 3 4 4 6% 8% 60%	3825
April	1st to 10th	Day	2 2 1 2 2 2 3 3 4 6% 74%	2275
	11th to 20th	Day	3 2 1 2 2 2 2 2 3 5% 75%	2251
	21st to end	Day	1 2 1 2 2 2 2 2 4 5% 78%	2280
May	1st to 10th	Day	1 1 1 1 1 1 2 3 4 83%	3800
	11th to 20th	Day	2 2 1 3 3 3 3 4 5% 6% 70%	3846
	21st to end	Day	1 1 1 1 1 2 1 2 3 87%	4477
June	1st to 10th	Day	2 2 1 3 3 3 3 3 5% 9% 65%	2470
	11th to 20th	Day	2 2 1 2 2 2 3 2 5% 6% 74%	2470
	21st to end	Day	5% 3 1 4 4 4 5% 5% 8% 8% 52%	2470
July	1st to 10th	Day	3 2 1 4 4 5% 6% 5% 8% 8% 54%	4110
	11th to 20th	Day	2 2 1 4 4 5% 6% 4 8% 9% 55%	4110
	21st to end	Day	4 3 2 6% 5% 6% 7% 6% 11% 11% 39%	4454
August	1st to 10th	Day	3 2 1 4 4 4 6% 5% 9% 12% 51%	3986
	11th to 20th	Day	3 2 1 3 3 3 4 5% 8% 9% 59%	3726
	21st to end	Day	3 3 2 4 4 5% 6% 6% 9% 10% 48%	4180
September	1st to 10th	Day	8% 4 1 5% 5% 4 4 4 6% 8% 50%	2280
	11th to 20th	Day	6% 3 2 4 3 3 4 3 5% 7% 60%	2280
	21st to end	Day	3 2 1 2 2 3 3 2 5% 5% 72%	2007
October	1st to 10th	Day	3 1 1 2 1 2 2 1 3 5% 78%	3170
	11th to 20th	Day	3 2 1 2 2 3 3 2 4 5% 75%	3150
	21st to end	Day	1 1 1 1 1 1 1 2 3 86%	3438
November	1st to 10th	Day	3 1 2 2 2 3 2 3 6% 75%	1959
	11th to 20th	Day	2 3 1 2 2 2 2 2 5% 7% 71%	2000
	21st to end	Day	5% 4 1 3 3 2 4 3 5% 7% 63%	1907
December	1st to 10th	Day	4 4 1 3 2 2 3 3 5% 7% 65%	1675
	11th to 20th	Day	5% 6% 3 5% 3 3 3 3 3 6% 61%	2234
	21st to end	Day	2 3 1 3 2 3 2 3 6% 9% 67%	3173
January	1st to 10th	Night	3 4 2 4 4 3 3 3 4 6% 64%	4097
	11th to 20th	Night	3 2 1 3 2 2 3 2 4 6% 72%	4110
	21st to end	Night	6% 5% 2 5% 4 3 3 4 6% 6% 55%	4521
February	1st to 10th	Night	2 2 1 3 2 3 3 3 6% 6% 70%	2464
	11th to 20th	Night	5% 4 1 3 3 3 3 3 4 5% 67%	2218
	21st to end	Night	3 3 1 3 2 3 3 4 4 6% 68%	1827
March	1st to 10th	Night	3 4 1 3 2 2 3 3 4 6% 67%	3430
	11th to 20th	Night	10% 3 1 4 3 3 3 3 4 5% 62%	3490
	21st to end	Night	2 3 1 3 3 3 4 3 5% 9% 64%	3828
April	1st to 10th	Night	1 2 1 2 3 2 3 3 5% 6% 73%	1905
	11th to 20th	Night	3 3 1 3 3 1 3 2 4 5% 71%	1877
	21st to end	Night	2 1 1 2 2 3 3 3 4 5% 74%	1900
May	1st to 10th	Night	1 1 1 1 2 2 1 3 4 83%	3170
	11th to 20th	Night	4 3 1 4 3 3 3 4 5% 6% 65%	3054
	21st to end	Night	2 1 2 1 1 1 1 2 3 85%	3110
June	1st to 10th	Night	3 2 1 3 2 3 4 3 7% 7% 64%	1710
	11th to 20th	Night	2 2 2 2 2 3 4 3 5% 6% 70%	1710
	21st to end	Night	5% 3 2 5% 5% 5% 5% 4 8% 8% 50%	1710
July	1st to 10th	Night	3 3 2 5% 4 5% 6% 6% 8% 11% 47%	2860
	11th to 20th	Night	3 4 2 6% 5% 6% 6% 5% 7% 12% 44%	2860
	21st to end	Night	5% 5% 3 9% 6% 7% 7% 7% 10% 11% 31%	3109
August	1st to 10th	Night	2 3 1 5% 5% 6% 7% 7% 11% 15% 38%	2939
	11th to 20th	Night	3 3 2 6% 4 5% 6% 5% 9% 12% 44%	3113
	21st to end	Night	4 5% 2 8% 7% 7% 7% 7% 9% 10% 35%	3487
September	1st to 10th	Night	6% 3 1 5% 5% 5% 6% 4 7% 7% 49%	1900
	11th to 20th	Night	6% 3 2 4 3 3 5% 4 6% 7% 58%	1900
	21st to end	Night	4 3 1 3 2 3 3 3 4 6% 68%	2164
October	1st to 10th	Night	3 2 1 2 2 2 2 2 4 5% 74%	3800
	11th to 20th	Night	3 2 1 3 2 2 2 2 3 5% 74%	3778
	21st to end	Night	1 1 1 2 1 2 2 1 3 5% 81%	4120
November	1st to 10th	Night	3 1 1 2 1 2 2 3 4 6% 75%	2340
	11th to 20th	Night	2 3 1 3 2 2 2 2 4 5% 75%	2400
	21st to end	Night	6% 4 2 3 2 2 2 3 4 7% 66%	2462
December	1st to 10th	Night	4 4 1 3 2 2 3 3 4 7% 66%	2720
	11th to 20th	Night	3 3 1 5% 3 4 4 4 6% 7% 60%	3201
	21st to end	Night	4 4 1 3 2 3 3 2 4 6% 68%	4566

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	16% 4 3 13% 43% 21%	2859
	11th to 20th	Day	12% 5% 5% 20% 43% 15%	2860
	21st to end	Day	24% 5% 4 25% 29% 13%	3146
February	1st to 10th	Day	15% 3 4 17% 29% 32%	1714
	11th to 20th	Day	19% 3 2 15% 32% 28%	1859
	21st to end	Day	15% 3 2 9% 32% 39%	1622
March	1st to 10th	Day	18% 3 1 7% 37% 33%	3444
	11th to 20th	Day	26% 5% 3 16% 26% 24%	3490
	21st to end	Day	18% 6% 3 12% 34% 27%	3825
April	1st to 10th	Day	12% 3 2 11% 31% 42%	2275
	11th to 20th	Day	13% 3 1 6% 27% 49%	2254
	21st to end	Day	10% 2 2 10% 32% 44%	2280
May	1st to 10th	Day	8% 1 1 5% 23% 62%	3800
	11th to 20th	Day	13% 5% 4 10% 26% 41%	3849
	21st to end	Day	6% 2 2 5% 13% 72%	4477
June	1st to 10th	Day	16% 4 3 13% 25% 40%	2470
	11th to 20th	Day	11% 3 2 7% 21% 56%	2470
	21st to end	Day	25% 5% 7% 15% 18% 30%	2470
July	1st to 10th	Day	23% 6% 11% 17% 18% 25%	4046
	11th to 20th	Day	21% 6% 12% 24% 29% 8%	4041
	21st to end	Day	30% 8% 15% 30% 15% 3	4314
August	1st to 10th	Day	20% 7% 13% 31% 25% 4	3972
	11th to 20th	Day	18% 5% 10% 20% 32% 14%	3762
	21st to end	Day	25% 8% 14% 24% 22% 8%	4179
September	1st to 10th	Day	28% 6% 8% 18% 23% 17%	2280
	11th to 20th	Day	23% 5% 5% 18% 26% 23%	2280
	21st to end	Day	15% 3 3 17% 34% 27%	2007
October	1st to 10th	Day	11% 2 4 10% 29% 45%	3170
	11th to 20th	Day	14% 2 4 12% 34% 34%	3150
	21st to end	Day	7% 1 1 13% 34% 44%	3438
November	1st to 10th	Day	12% 1 3 18% 37% 30%	1959
	11th to 20th	Day	14% 2 4 18% 31% 31%	2000
	21st to end	Day	22% 2 5% 16% 33% 23%	1907
December	1st to 10th	Day	18% 3 4 22% 35% 17%	1675
	11th to 20th	Day	27% 2 5% 19% 32% 14%	2233
	21st to end	Day	14% 3 6% 20% 38% 20%	3173
January	1st to 10th	Night	20% 4 2 16% 42% 15%	4097
	11th to 20th	Night	14% 3 5% 17% 46% 15%	4110
	21st to end	Night	26% 5% 5% 21% 31% 12%	4521
February	1st to 10th	Night	15% 2 4 19% 29% 31%	2464
	11th to 20th	Night	20% 3 3 14% 30% 30%	2218
	21st to end	Night	17% 3 3 9% 30% 38%	1827
March	1st to 10th	Night	16% 4 3 11% 37% 30%	3430
	11th to 20th	Night	25% 4 2 15% 33% 22%	3490
	21st to end	Night	16% 5% 4 15% 37% 24%	3828
April	1st to 10th	Night	12% 3 3 10% 35% 37%	1905
	11th to 20th	Night	15% 2 2 10% 26% 44%	1877
	21st to end	Night	11% 4 2 12% 31% 40%	1900
May	1st to 10th	Night	8% 2 1 5% 21% 62%	3170
	11th to 20th	Night	17% 6% 5% 9% 22% 41%	3055
	21st to end	Night	8% 2 2 5% 11% 72%	3110
June	1st to 10th	Night	17% 4 5% 15% 24% 37%	1710
	11th to 20th	Night	14% 4 3 8% 17% 53%	1710
	21st to end	Night	28% 6% 9% 14% 16% 28%	1710
July	1st to 10th	Night	26% 7% 14% 15% 17% 20%	2815
	11th to 20th	Night	30% 7% 12% 19% 26% 6%	2806
	21st to end	Night	39% 9% 16% 25% 9% 2	3011
August	1st to 10th	Night	27% 8% 14% 34% 13% 4	2930
	11th to 20th	Night	26% 7% 12% 16% 30% 9%	3143
	21st to end	Night	38% 9% 14% 19% 17% 4	3487
September	1st to 10th	Night	29% 6% 11% 18% 19% 17%	1900
	11th to 20th	Night	23% 5% 9% 18% 22% 23%	1900
	21st to end	Night	17% 4 6% 15% 33% 25%	2164
October	1st to 10th	Night	13% 2 5% 8% 29% 42%	3800
	11th to 20th	Night	14% 2 4 13% 28% 39%	3778
	21st to end	Night	9% 1 1 10% 31% 48%	4120
November	1st to 10th	Night	11% 2 2 17% 36% 32%	2340
	11th to 20th	Night	13% 2 2 15% 32% 35%	2400
	21st to end	Night	20% 2 4 18% 33% 24%	2462
December	1st to 10th	Night	19% 3 4 21% 33% 21%	2720
	11th to 20th	Night	22% 3 7% 19% 34% 14%	3201
	21st to end	Night	19% 3 3 18% 38% 19%	4566

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	8% 11% 25% 40% 14% 2	270
	11th to 20th	Day	10% 6% 26% 39% 16% 4	270
	21st to end	Day	8% 9% 33% 31% 16% 3	297
February	1st to 10th	Day	7% 12% 27% 32% 19% 4	270
	11th to 20th	Day	10% 13% 31% 35% 9% 1	270
	21st to end	Day	17% 22% 28% 24% 8% 2	277
March	1st to 10th	Day	12% 24% 32% 23% 9% 1	460
	11th to 20th	Day	15% 17% 28% 29% 9% 3	460
	21st to end	Day	12% 28% 30% 20% 8% 1	506
April	1st to 10th	Day	5% 25% 35% 22% 11% 2	460
	11th to 20th	Day	10% 23% 34% 23% 9% 1	452
	21st to end	Day	7% 24% 32% 24% 11% 2	460
May	1st to 10th	Day	5% 21% 37% 25% 10% 3	463
	11th to 20th	Day	3 14% 29% 32% 19% 3	488
	21st to end	Day	4 14% 36% 31% 14% 1	529
June	1st to 10th	Day	4 6% 24% 34% 25% 7%	490
	11th to 20th	Day	5% 8% 25% 33% 22% 8%	490
	21st to end	Day	7% 2 17% 32% 28% 14%	490
July	1st to 10th	Day	5% 9% 31% 37% 18%	486
	11th to 20th	Day	3 1 1 24% 42% 29%	484
	21st to end	Day	4 1 2 23% 44% 26%	531
August	1st to 10th	Day	3 1 4 26% 40% 26%	487
	11th to 20th	Day	5% 1 6% 25% 42% 21%	477
	21st to end	Day	5% 1 4 28% 41% 21%	539
September	1st to 10th	Day	8% 1 6% 32% 39% 14%	490
	11th to 20th	Day	4 2 17% 34% 32% 12%	490
	21st to end	Day	4 6% 16% 34% 29% 11%	386
October	1st to 10th	Day	7% 5% 19% 28% 30% 11%	300
	11th to 20th	Day	8% 7% 17% 34% 25% 9%	300
	21st to end	Day	8% 8% 13% 34% 25% 11%	330
November	1st to 10th	Day	7% 11% 26% 35% 16% 6%	300
	11th to 20th	Day	5% 8% 20% 33% 29% 5%	300
	21st to end	Day	9% 13% 30% 32% 12% 4	300
December	1st to 10th	Day	11% 7% 25% 39% 17% 2	300
	11th to 20th	Day	8% 10% 25% 41% 15% 2	300
	21st to end	Day	9% 13% 27% 36% 14% 1	306
January	1st to 10th	Night	6% 3 22% 48% 19% 2	760
	11th to 20th	Night	6% 5% 25% 45% 18% 2	760
	21st to end	Night	6% 8% 26% 42% 16% 2	836
February	1st to 10th	Night	4 6% 29% 42% 18% 2	760
	11th to 20th	Night	7% 6% 30% 46% 10%	744
	21st to end	Night	4 11% 38% 39% 8%	628
March	1st to 10th	Night	5% 8% 32% 43% 12% 1	760
	11th to 20th	Night	4 6% 27% 46% 15% 2	760
	21st to end	Night	4 9% 33% 42% 11% 1	836
April	1st to 10th	Night	2 8% 34% 46% 9%	575
	11th to 20th	Night	4 11% 33% 40% 11%	563
	21st to end	Night	2 10% 32% 45% 11% 1	570
May	1st to 10th	Night	3 7% 28% 50% 12%	570
	11th to 20th	Night	4 3 21% 51% 20% 2	561
	21st to end	Night	2 6% 23% 55% 13%	617
June	1st to 10th	Night	4 3 14% 54% 25% 1	570
	11th to 20th	Night	2 2 19% 51% 26% 1	570
	21st to end	Night	6% 1 9% 42% 39% 3	570
July	1st to 10th	Night	6% 1 4 30% 52% 7%	555
	11th to 20th	Night	3 1 2 26% 59% 9%	552
	21st to end	Night	7% 1 3 20% 59% 10%	624
August	1st to 10th	Night	4 1 1 22% 59% 13%	567
	11th to 20th	Night	6% 1 3 24% 56% 9%	564
	21st to end	Night	4 1 2 27% 59% 7%	627
September	1st to 10th	Night	7% 1 4 32% 51% 5%	570
	11th to 20th	Night	6% 1 6% 42% 42% 2	570
	21st to end	Night	4 2 8% 44% 39% 3	733
October	1st to 10th	Night	7% 2 14% 47% 28% 3	760
	11th to 20th	Night	5% 2 16% 49% 26% 2	760
	21st to end	Night	3 4 16% 43% 29% 5%	836
November	1st to 10th	Night	3 3 17% 49% 25% 3	780
	11th to 20th	Night	3 3 19% 45% 26% 4	800
	21st to end	Night	8% 5% 23% 41% 19% 4	862
December	1st to 10th	Night	7% 6% 22% 48% 17% 1	1000
	11th to 20th	Night	5% 4 27% 47% 16% 1	830
	21st to end	Night	5% 5% 28% 46% 14% 2	850

Page generated at 2024-12-21 02:13:47. Version ac07

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