PampaTX
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the PampaTX clear sky chart from 2005-11-06 to 2025-01-07.

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	5% 4 2 4 3 3 3 3 5% 7% 60%	109058
	Night	5% 4 2 4 3 3 3 3 5% 7% 60%	108598
Transparency	Day	25% 3 8% 24% 28% 12%	108822
	Night	24% 3 8% 23% 28% 13%	108424
Seeing	Day	7% 8% 31% 33% 17% 4	15535
	Night	7% 9% 39% 35% 10% 1	25567

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% 8% 4 6% 4 3 3 3 4 5% 56%	2901
	11th to 20th	Day	4 4 1 3 3 3 3 3 4 5% 66%	2850
	21st to end	Day	7% 6% 2 6% 3 3 4 2 4 7% 55%	3368
February	1st to 10th	Day	5% 7% 2 4 3 4 2 3 4 6% 59%	1900
	11th to 20th	Day	6% 7% 2 6% 3 3 3 3 4 6% 59%	1849
	21st to end	Day	4 5% 1 4 3 3 4 3 4 5% 63%	1570
March	1st to 10th	Day	5% 3 1 4 3 2 3 3 5% 7% 63%	3130
	11th to 20th	Day	7% 5% 2 5% 3 3 3 4 4 6% 59%	3408
	21st to end	Day	5% 7% 3 7% 5% 5% 4 4 5% 6% 50%	3869
April	1st to 10th	Day	6% 4 1 4 3 3 3 2 5% 6% 64%	2280
	11th to 20th	Day	9% 5% 1 5% 3 2 3 3 6% 6% 58%	2251
	21st to end	Day	7% 4 1 4 3 2 3 4 5% 6% 60%	2356
May	1st to 10th	Day	9% 5% 2 4 3 3 3 2 5% 6% 58%	4120
	11th to 20th	Day	7% 5% 2 5% 4 4 4 3 5% 7% 55%	4082
	21st to end	Day	7% 4 2 4 3 3 3 3 5% 6% 61%	4489
June	1st to 10th	Day	5% 4 1 5% 4 3 4 4 7% 9% 53%	2470
	11th to 20th	Day	3 3 2 4 3 3 4 3 6% 9% 61%	2470
	21st to end	Day	2 3 1 4 3 3 4 4 6% 9% 59%	2470
July	1st to 10th	Day	7% 3 2 5% 3 4 5% 4 7% 8% 51%	4120
	11th to 20th	Day	4 3 1 4 3 4 4 3 6% 9% 60%	4120
	21st to end	Day	2 2 1 4 3 4 5% 4 6% 9% 60%	4466
August	1st to 10th	Day	3 3 1 4 3 4 5% 4 7% 9% 57%	3986
	11th to 20th	Day	3 3 1 3 3 4 4 4 6% 9% 60%	3726
	21st to end	Day	5% 3 1 3 3 3 4 4 6% 9% 59%	4180
September	1st to 10th	Day	7% 4 1 4 4 3 3 4 5% 6% 57%	2223
	11th to 20th	Day	7% 5% 2 5% 3 3 3 3 6% 7% 56%	2090
	21st to end	Day	7% 3 2 4 3 3 3 2 3 6% 65%	2090
October	1st to 10th	Day	6% 3 1 3 2 2 2 2 3 4 73%	3480
	11th to 20th	Day	6% 4 2 5% 2 3 3 2 4 5% 64%	3408
	21st to end	Day	5% 2 1 3 2 2 2 2 3 5% 74%	3154
November	1st to 10th	Day	6% 3 2 3 2 2 2 2 4 6% 69%	1763
	11th to 20th	Day	3 3 1 5% 3 2 2 3 4 6% 69%	1800
	21st to end	Day	8% 5% 1 4 2 2 2 2 4 5% 64%	1800
December	1st to 10th	Day	3 3 1 3 2 3 3 3 5% 6% 69%	2940
	11th to 20th	Day	4 3 1 4 3 3 4 3 5% 5% 65%	3391
	21st to end	Day	5% 9% 3 6% 3 4 3 3 4 6% 54%	4488
January	1st to 10th	Night	5% 6% 4 6% 4 4 4 3 5% 6% 55%	4187
	11th to 20th	Night	3 4 1 4 3 3 3 3 6% 7% 62%	4120
	21st to end	Night	7% 8% 3 6% 4 3 3 3 4 6% 53%	4326
February	1st to 10th	Night	6% 6% 2 6% 4 3 4 2 4 5% 58%	2280
	11th to 20th	Night	6% 7% 2 5% 4 4 4 4 4 7% 56%	2218
	21st to end	Night	6% 4 2 4 3 3 4 4 6% 5% 60%	1884
March	1st to 10th	Night	4 3 1 4 3 3 3 2 4 5% 66%	3734
	11th to 20th	Night	6% 5% 1 5% 3 4 3 3 5% 7% 58%	3554
	21st to end	Night	5% 5% 2 5% 4 5% 4 3 6% 7% 54%	3760
April	1st to 10th	Night	5% 4 1 3 3 3 3 3 5% 8% 61%	1900
	11th to 20th	Night	7% 5% 2 4 3 4 3 4 5% 6% 57%	1877
	21st to end	Night	8% 4 2 4 3 2 3 3 5% 8% 58%	1821
May	1st to 10th	Night	9% 8% 2 5% 4 4 3 2 4 5% 55%	2850
	11th to 20th	Night	9% 5% 2 6% 4 3 4 4 6% 7% 52%	2823
	21st to end	Night	9% 5% 1 4 2 3 3 3 5% 6% 59%	3098
June	1st to 10th	Night	5% 3 1 5% 3 4 4 5% 6% 10% 54%	1710
	11th to 20th	Night	3 2 1 3 3 3 4 4 6% 10% 60%	1710
	21st to end	Night	3 3 1 4 3 3 4 4 7% 10% 58%	1649
July	1st to 10th	Night	6% 4 1 5% 4 4 4 5% 8% 9% 52%	2817
	11th to 20th	Night	3 2 2 5% 3 5% 5% 5% 8% 11% 51%	2850
	21st to end	Night	2 3 1 3 3 3 4 4 7% 11% 58%	3097
August	1st to 10th	Night	4 3 1 4 4 4 5% 4 9% 11% 51%	2949
	11th to 20th	Night	3 3 1 4 5% 5% 5% 4 8% 11% 50%	3113
	21st to end	Night	4 3 1 3 3 4 4 4 7% 10% 57%	3487
September	1st to 10th	Night	5% 5% 1 5% 3 3 3 3 5% 7% 60%	1956
	11th to 20th	Night	7% 5% 2 4 3 4 3 3 5% 7% 56%	2090
	21st to end	Night	5% 3 1 3 2 3 3 4 4 6% 66%	2090
October	1st to 10th	Night	5% 3 1 3 1 2 2 1 2 4 75%	3480
	11th to 20th	Night	7% 4 2 4 2 3 3 2 4 5% 66%	3477
	21st to end	Night	4 2 1 2 2 2 2 2 4 6% 73%	4400
November	1st to 10th	Night	4 4 1 3 2 3 2 2 4 5% 69%	2535
	11th to 20th	Night	3 3 1 3 2 3 2 2 4 5% 72%	2600
	21st to end	Night	7% 4 1 4 3 3 2 3 4 6% 64%	2600
December	1st to 10th	Night	3 4 1 3 2 2 2 2 4 6% 70%	4250
	11th to 20th	Night	3 3 1 4 3 3 3 2 4 7% 66%	4816
	21st to end	Night	7% 6% 2 4 3 3 3 3 5% 7% 57%	6490

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	33% 2 4 23% 30% 8%	2902
	11th to 20th	Day	22% 2 9% 26% 32% 9%	2850
	21st to end	Day	32% 1 6% 24% 31% 6%	3368
February	1st to 10th	Day	27% 2 8% 25% 26% 12%	1900
	11th to 20th	Day	28% 3 5% 26% 25% 14%	1859
	21st to end	Day	24% 2 4 21% 33% 16%	1570
March	1st to 10th	Day	21% 3 6% 18% 24% 29%	3130
	11th to 20th	Day	28% 2 7% 25% 29% 9%	3408
	21st to end	Day	33% 4 7% 24% 23% 9%	3869
April	1st to 10th	Day	22% 3 6% 21% 29% 20%	2280
	11th to 20th	Day	27% 4 6% 23% 22% 18%	2254
	21st to end	Day	25% 3 10% 25% 27% 9%	2356
May	1st to 10th	Day	29% 3 8% 22% 22% 17%	4120
	11th to 20th	Day	29% 3 9% 25% 25% 9%	4086
	21st to end	Day	25% 4 10% 18% 22% 21%	4489
June	1st to 10th	Day	25% 5% 17% 29% 16% 8%	2470
	11th to 20th	Day	20% 4 11% 24% 29% 12%	2470
	21st to end	Day	21% 4 13% 29% 20% 12%	2470
July	1st to 10th	Day	31% 4 9% 28% 23% 5%	4056
	11th to 20th	Day	22% 2 10% 31% 29% 6%	4051
	21st to end	Day	22% 3 10% 33% 27% 6%	4325
August	1st to 10th	Day	24% 3 13% 29% 22% 9%	3973
	11th to 20th	Day	22% 3 8% 24% 33% 10%	3762
	21st to end	Day	22% 3 11% 29% 29% 6%	4179
September	1st to 10th	Day	26% 4 11% 23% 23% 13%	2223
	11th to 20th	Day	28% 4 10% 21% 30% 7%	2090
	21st to end	Day	22% 3 6% 24% 33% 12%	2090
October	1st to 10th	Day	18% 2 5% 13% 42% 21%	3480
	11th to 20th	Day	25% 1 5% 22% 29% 18%	3408
	21st to end	Day	16% 2 3 24% 40% 15%	3154
November	1st to 10th	Day	19% 2 6% 21% 33% 19%	1763
	11th to 20th	Day	18% 2 5% 27% 33% 16%	1800
	21st to end	Day	25% 1 4 19% 33% 18%	1800
December	1st to 10th	Day	18% 1 7% 33% 31% 11%	2940
	11th to 20th	Day	23% 1 4 17% 41% 14%	3389
	21st to end	Day	33% 2 5% 22% 27% 11%	4488
January	1st to 10th	Night	30% 2 5% 29% 27% 7%	4187
	11th to 20th	Night	21% 2 13% 23% 30% 10%	4120
	21st to end	Night	35% 2 7% 19% 30% 8%	4326
February	1st to 10th	Night	30% 3 6% 20% 28% 13%	2280
	11th to 20th	Night	30% 2 6% 22% 25% 15%	2218
	21st to end	Night	25% 3 2 22% 29% 20%	1884
March	1st to 10th	Night	20% 2 5% 20% 24% 29%	3734
	11th to 20th	Night	26% 2 8% 24% 25% 15%	3554
	21st to end	Night	29% 3 8% 25% 20% 14%	3760
April	1st to 10th	Night	22% 4 8% 21% 24% 21%	1900
	11th to 20th	Night	28% 4 8% 21% 25% 15%	1877
	21st to end	Night	26% 4 10% 28% 21% 11%	1821
May	1st to 10th	Night	33% 3 6% 18% 18% 22%	2850
	11th to 20th	Night	32% 4 12% 22% 20% 10%	2824
	21st to end	Night	26% 4 11% 16% 16% 26%	3099
June	1st to 10th	Night	25% 5% 19% 29% 15% 7%	1710
	11th to 20th	Night	19% 6% 13% 26% 24% 12%	1710
	21st to end	Night	20% 4 15% 25% 24% 12%	1649
July	1st to 10th	Night	28% 4 12% 35% 17% 3	2772
	11th to 20th	Night	25% 3 13% 25% 27% 7%	2796
	21st to end	Night	21% 2 12% 29% 30% 5%	2999
August	1st to 10th	Night	25% 3 14% 24% 26% 8%	2939
	11th to 20th	Night	28% 4 9% 24% 27% 8%	3143
	21st to end	Night	22% 3 14% 30% 25% 6%	3487
September	1st to 10th	Night	24% 4 11% 25% 24% 11%	1956
	11th to 20th	Night	28% 4 11% 21% 29% 7%	2090
	21st to end	Night	20% 4 7% 24% 31% 15%	2090
October	1st to 10th	Night	16% 2 5% 14% 40% 24%	3480
	11th to 20th	Night	24% 1 9% 17% 31% 18%	3477
	21st to end	Night	15% 1 5% 23% 38% 18%	4400
November	1st to 10th	Night	20% 2 6% 22% 31% 19%	2535
	11th to 20th	Night	18% 2 5% 26% 35% 16%	2600
	21st to end	Night	24% 2 4 20% 32% 18%	2600
December	1st to 10th	Night	17% 2 5% 33% 35% 8%	4250
	11th to 20th	Night	20% 1 3 19% 41% 16%	4817
	21st to end	Night	29% 2 7% 24% 28% 11%	6490

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	6% 11% 50% 22% 11% 1	288
	11th to 20th	Day	13% 17% 39% 21% 9%	270
	21st to end	Day	6% 11% 41% 31% 9% 2	297
February	1st to 10th	Day	9% 11% 39% 34% 6%	270
	11th to 20th	Day	10% 13% 43% 22% 10% 1	270
	21st to end	Day	11% 15% 48% 22% 4	225
March	1st to 10th	Day	6% 12% 49% 28% 5%	270
	11th to 20th	Day	15% 15% 37% 27% 5% 1	270
	21st to end	Day	11% 19% 38% 22% 9%	327
April	1st to 10th	Day	11% 17% 43% 22% 6% 1	460
	11th to 20th	Day	10% 21% 43% 21% 4	452
	21st to end	Day	12% 15% 42% 22% 7% 1	536
May	1st to 10th	Day	8% 12% 41% 29% 9% 1	653
	11th to 20th	Day	9% 9% 29% 34% 16% 2	675
	21st to end	Day	7% 10% 40% 29% 12% 2	734
June	1st to 10th	Day	6% 5% 28% 39% 18% 4	680
	11th to 20th	Day	3 6% 34% 40% 16% 2	680
	21st to end	Day	3 3 27% 42% 20% 5%	680
July	1st to 10th	Day	6% 2 14% 38% 30% 10%	671
	11th to 20th	Day	3 1 11% 45% 32% 7%	668
	21st to end	Day	4 1 10% 38% 37% 10%	739
August	1st to 10th	Day	3 1 15% 42% 33% 6%	611
	11th to 20th	Day	4 1 17% 41% 31% 7%	477
	21st to end	Day	5% 1 14% 43% 29% 8%	539
September	1st to 10th	Day	6% 2 15% 41% 29% 8%	433
	11th to 20th	Day	4 3 16% 47% 23% 7%	300
	21st to end	Day	8% 6% 21% 33% 25% 6%	300
October	1st to 10th	Day	11% 5% 27% 36% 20% 2	300
	11th to 20th	Day	6% 8% 34% 32% 17% 4	300
	21st to end	Day	16% 7% 32% 29% 13% 3	330
November	1st to 10th	Day	10% 9% 36% 30% 12% 3	300
	11th to 20th	Day	7% 11% 40% 27% 13% 3	300
	21st to end	Day	14% 13% 35% 25% 10% 3	300
December	1st to 10th	Day	4 9% 47% 27% 11% 2	300
	11th to 20th	Day	9% 7% 44% 32% 7% 1	300
	21st to end	Day	12% 18% 44% 19% 6%	330
January	1st to 10th	Night	5% 11% 42% 34% 8%	981
	11th to 20th	Night	8% 11% 40% 30% 10% 1	950
	21st to end	Night	6% 9% 43% 34% 8% 1	917
February	1st to 10th	Night	8% 12% 44% 31% 5% 1	760
	11th to 20th	Night	9% 14% 49% 24% 4	744
	21st to end	Night	9% 15% 49% 23% 4	628
March	1st to 10th	Night	8% 12% 49% 29% 3	760
	11th to 20th	Night	9% 16% 43% 27% 5%	618
	21st to end	Night	9% 16% 51% 21% 3	627
April	1st to 10th	Night	8% 15% 51% 25% 2	570
	11th to 20th	Night	9% 16% 55% 18% 2	563
	21st to end	Night	9% 15% 46% 25% 5%	570
May	1st to 10th	Night	8% 14% 49% 25% 4	570
	11th to 20th	Night	9% 10% 40% 32% 8% 1	561
	21st to end	Night	8% 8% 49% 26% 7%	617
June	1st to 10th	Night	5% 5% 45% 36% 9% 1	570
	11th to 20th	Night	4 6% 50% 35% 5%	570
	21st to end	Night	3 4 38% 43% 12%	570
July	1st to 10th	Night	4 2 24% 47% 21% 2	555
	11th to 20th	Night	3 1 18% 55% 22% 1	552
	21st to end	Night	3 15% 56% 25% 1	624
August	1st to 10th	Night	5% 1 19% 50% 24% 1	567
	11th to 20th	Night	6% 2 23% 50% 18% 1	564
	21st to end	Night	5% 1 18% 50% 26% 1	627
September	1st to 10th	Night	6% 1 24% 48% 20% 1	570
	11th to 20th	Night	8% 3 30% 46% 12% 1	570
	21st to end	Night	5% 4 31% 43% 17% 1	570
October	1st to 10th	Night	11% 5% 35% 38% 11% 1	570
	11th to 20th	Night	7% 9% 40% 37% 5% 2	575
	21st to end	Night	8% 10% 35% 32% 14% 1	1002
November	1st to 10th	Night	6% 9% 39% 35% 10% 1	975
	11th to 20th	Night	5% 11% 40% 34% 8%	1000
	21st to end	Night	8% 12% 35% 34% 10% 1	1000
December	1st to 10th	Night	7% 10% 40% 35% 8%	1000
	11th to 20th	Night	8% 13% 43% 30% 6%	1000
	21st to end	Night	11% 12% 41% 30% 5%	1100

Page generated at 2025-01-04 02:23:57. Version ac07

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