Observatorio Bahía Bacochibampo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Observatorio Bahía Bacochibampo clear sky chart from 2005-11-06 to 2025-01-22.

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
Transparency	Day	13% 4 8% 15% 25% 35%	108911
	Night	15% 4 6% 12% 25% 39%	108839
Seeing	Day	4 1 10% 30% 41% 14%	15322
	Night	4 1 9% 33% 40% 14%	25560

By Month

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	8% 1 3 13% 33% 43%	2949
	11th to 20th	Day	13% 3 4 9% 28% 44%	2950
	21st to end	Day	22% 3 4 12% 35% 24%	3155
February	1st to 10th	Day	17% 4 5% 7% 27% 40%	1900
	11th to 20th	Day	22% 2 5% 9% 25% 37%	1877
	21st to end	Day	16% 3 3 11% 27% 39%	1727
March	1st to 10th	Day	19% 3 5% 9% 30% 34%	3444
	11th to 20th	Day	16% 2 4 10% 30% 37%	3490
	21st to end	Day	16% 2 4 7% 31% 39%	3825
April	1st to 10th	Day	14% 2 2 7% 23% 52%	2090
	11th to 20th	Day	11% 2 3 7% 23% 54%	2142
	21st to end	Day	8% 1 2 7% 23% 58%	2280
May	1st to 10th	Day	5% 1 2 5% 26% 62%	3818
	11th to 20th	Day	5% 2 3 5% 24% 62%	4074
	21st to end	Day	4 1 2 4 21% 68%	4477
June	1st to 10th	Day	8% 2 3 9% 31% 46%	2470
	11th to 20th	Day	8% 2 3 10% 36% 41%	2470
	21st to end	Day	12% 5% 10% 20% 31% 22%	2470
July	1st to 10th	Day	19% 9% 20% 20% 23% 9%	4046
	11th to 20th	Day	22% 10% 25% 30% 12% 1	4041
	21st to end	Day	23% 10% 26% 33% 7% 1	4314
August	1st to 10th	Day	19% 8% 21% 32% 17% 4	4078
	11th to 20th	Day	15% 8% 23% 38% 14% 2	3892
	21st to end	Day	14% 7% 16% 34% 25% 4	3853
September	1st to 10th	Day	26% 9% 16% 22% 20% 7%	2090
	11th to 20th	Day	11% 3 7% 24% 33% 22%	2090
	21st to end	Day	9% 4 7% 20% 34% 26%	2090
October	1st to 10th	Day	5% 2 4 13% 30% 46%	3404
	11th to 20th	Day	8% 1 3 14% 38% 36%	3150
	21st to end	Day	5% 1 2 8% 22% 62%	3438
November	1st to 10th	Day	10% 2 3 10% 27% 48%	1959
	11th to 20th	Day	13% 2 3 10% 25% 47%	2000
	21st to end	Day	20% 3 5% 15% 27% 31%	1990
December	1st to 10th	Day	15% 2 4 9% 16% 54%	2950
	11th to 20th	Day	18% 2 3 7% 23% 48%	3408
	21st to end	Day	9% 1 4 12% 36% 39%	4510
January	1st to 10th	Night	9% 2 3 10% 34% 43%	4227
	11th to 20th	Night	13% 2 3 8% 28% 48%	4240
	21st to end	Night	24% 3 5% 12% 32% 24%	4530
February	1st to 10th	Night	19% 2 3 8% 23% 44%	2280
	11th to 20th	Night	22% 3 4 10% 25% 36%	2200
	21st to end	Night	18% 2 4 8% 29% 39%	1727
March	1st to 10th	Night	22% 3 4 7% 30% 35%	3430
	11th to 20th	Night	15% 3 4 11% 27% 40%	3490
	21st to end	Night	17% 3 3 7% 24% 45%	3828
April	1st to 10th	Night	12% 2 3 7% 21% 54%	2090
	11th to 20th	Night	12% 2 2 6% 24% 54%	1986
	21st to end	Night	8% 1 2 5% 19% 63%	1900
May	1st to 10th	Night	6% 1 4 21% 68%	3147
	11th to 20th	Night	3 1 2 5% 22% 66%	2835
	21st to end	Night	5% 1 1 2 20% 71%	3110
June	1st to 10th	Night	8% 2 3 7% 25% 56%	1710
	11th to 20th	Night	9% 2 3 7% 29% 49%	1710
	21st to end	Night	15% 5% 10% 16% 25% 28%	1710
July	1st to 10th	Night	22% 10% 18% 20% 19% 11%	2815
	11th to 20th	Night	26% 10% 20% 31% 12% 1	2806
	21st to end	Night	30% 11% 22% 28% 8% 1	3011
August	1st to 10th	Night	25% 12% 20% 25% 14% 4	2838
	11th to 20th	Night	23% 8% 18% 33% 17% 2	3013
	21st to end	Night	16% 7% 16% 33% 23% 5%	3804
September	1st to 10th	Night	29% 9% 14% 21% 20% 6%	2090
	11th to 20th	Night	12% 3 9% 19% 33% 25%	2090
	21st to end	Night	10% 4 7% 20% 28% 32%	2090
October	1st to 10th	Night	6% 2 4 10% 28% 50%	3570
	11th to 20th	Night	9% 2 2 10% 34% 43%	3778
	21st to end	Night	4 1 2 7% 19% 67%	4120
November	1st to 10th	Night	10% 2 3 9% 27% 48%	2340
	11th to 20th	Night	15% 2 3 8% 25% 48%	2400
	21st to end	Night	21% 3 5% 12% 27% 33%	2405
December	1st to 10th	Night	15% 2 4 8% 19% 52%	4240
	11th to 20th	Night	14% 2 4 7% 22% 51%	4811
	21st to end	Night	11% 2 4 8% 35% 39%	6468

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	2 1 15% 42% 33% 8%	300
	11th to 20th	Day	4 2 7% 41% 34% 11%	300
	21st to end	Day	3 2 19% 41% 28% 8%	300
February	1st to 10th	Day	6% 3 23% 36% 27% 5%	460
	11th to 20th	Day	10% 2 26% 35% 23% 4	455
	21st to end	Day	6% 3 32% 41% 15% 3	382
March	1st to 10th	Day	6% 4 23% 39% 26% 3	460
	11th to 20th	Day	5% 2 21% 38% 28% 6%	460
	21st to end	Day	4 3 23% 46% 21% 4	506
April	1st to 10th	Day	3 2 22% 40% 28% 6%	460
	11th to 20th	Day	2 2 19% 46% 24% 7%	452
	21st to end	Day	1 1 15% 37% 38% 9%	460
May	1st to 10th	Day	2 17% 36% 35% 10%	463
	11th to 20th	Day	1 1 13% 43% 34% 9%	488
	21st to end	Day	1 1 9% 36% 45% 9%	529
June	1st to 10th	Day	1 1 4 31% 52% 10%	490
	11th to 20th	Day	2 1 3 26% 52% 16%	490
	21st to end	Day	4 1 2 23% 57% 15%	490
July	1st to 10th	Day	3 3 20% 57% 17%	486
	11th to 20th	Day	5% 1 1 15% 57% 21%	484
	21st to end	Day	4 2 2 16% 54% 23%	531
August	1st to 10th	Day	3 1 16% 51% 28%	487
	11th to 20th	Day	1 1 2 13% 55% 26%	477
	21st to end	Day	3 1 1 12% 52% 31%	539
September	1st to 10th	Day	6% 1 2 18% 49% 24%	490
	11th to 20th	Day	3 1 15% 60% 20%	490
	21st to end	Day	2 3 22% 52% 20%	490
October	1st to 10th	Day	3 5% 25% 51% 17%	443
	11th to 20th	Day	6% 5% 26% 41% 22%	300
	21st to end	Day	2 6% 26% 45% 21%	330
November	1st to 10th	Day	3 1 7% 34% 37% 18%	300
	11th to 20th	Day	3 1 13% 27% 39% 17%	300
	21st to end	Day	6% 3 11% 36% 31% 13%	300
December	1st to 10th	Day	7% 1 8% 32% 44% 8%	300
	11th to 20th	Day	6% 1 9% 38% 35% 12%	300
	21st to end	Day	6% 2 9% 41% 30% 11%	330
January	1st to 10th	Night	3 1 14% 45% 34% 4	800
	11th to 20th	Night	4 1 14% 49% 31% 3	800
	21st to end	Night	6% 2 20% 45% 24% 3	840
February	1st to 10th	Night	5% 2 16% 42% 30% 5%	760
	11th to 20th	Night	7% 1 16% 50% 24% 2	744
	21st to end	Night	4 1 20% 56% 17% 3	628
March	1st to 10th	Night	8% 1 20% 46% 24% 2	760
	11th to 20th	Night	4 1 12% 41% 36% 6%	760
	21st to end	Night	4 1 13% 45% 32% 5%	836
April	1st to 10th	Night	2 1 11% 47% 33% 6%	760
	11th to 20th	Night	3 13% 46% 35% 4	672
	21st to end	Night	2 7% 43% 41% 6%	570
May	1st to 10th	Night	2 6% 43% 43% 6%	570
	11th to 20th	Night	1 3 34% 55% 8%	561
	21st to end	Night	3 32% 54% 11%	617
June	1st to 10th	Night	1 2 23% 61% 14%	570
	11th to 20th	Night	2 1 1 15% 61% 20%	570
	21st to end	Night	1 1 11% 54% 33%	570
July	1st to 10th	Night	2 1 2 11% 52% 33%	555
	11th to 20th	Night	3 2 8% 52% 35%	552
	21st to end	Night	4 2 12% 43% 38%	624
August	1st to 10th	Night	4 1 1 7% 42% 44%	567
	11th to 20th	Night	5% 1 2 8% 38% 47%	564
	21st to end	Night	4 1 3 9% 41% 43%	814
September	1st to 10th	Night	7% 1 3 11% 42% 36%	760
	11th to 20th	Night	4 2 6% 55% 33%	760
	21st to end	Night	3 1 16% 58% 21%	760
October	1st to 10th	Night	2 2 25% 54% 17%	760
	11th to 20th	Night	6% 5% 29% 49% 12%	760
	21st to end	Night	2 1 5% 31% 51% 10%	836
November	1st to 10th	Night	2 6% 38% 43% 11%	780
	11th to 20th	Night	4 1 10% 39% 38% 8%	800
	21st to end	Night	5% 2 13% 41% 33% 6%	800
December	1st to 10th	Night	5% 1 10% 46% 33% 4	800
	11th to 20th	Night	4 1 14% 49% 27% 5%	800
	21st to end	Night	5% 1 16% 46% 25% 6%	880

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