Ciudad Delicias
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ciudad Delicias clear sky chart from 2005-11-06 to 2024-11-25.

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 3 1 3 3 3 4 3 5% 8% 64%	100998
	Night	5% 4 2 5% 4 4 4 4 6% 7% 54%	98663
Transparency	Day	18% 4 8% 18% 25% 27%	104756
	Night	27% 5% 7% 14% 23% 26%	103068
Seeing	Day	6% 5% 16% 29% 29% 16%	14209
	Night	7% 3 19% 43% 25% 2	24083

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	3 2 1 2 2 2 2 2 3 6% 76%	3167
	11th to 20th	Day	3 2 1 3 2 2 2 2 4 5% 75%	3170
	21st to end	Day	5% 5% 2 5% 3 3 3 3 4 7% 60%	3487
February	1st to 10th	Day	4 4 1 4 3 3 4 3 3 5% 65%	1900
	11th to 20th	Day	4 4 1 3 3 3 3 4 5% 5% 66%	1849
	21st to end	Day	3 2 2 2 3 4 4 6% 7% 67%	1570
March	1st to 10th	Day	3 3 1 3 3 3 4 4 6% 9% 61%	3374
	11th to 20th	Day	3 3 1 3 2 3 3 4 5% 6% 67%	3490
	21st to end	Day	2 3 1 3 2 3 4 4 6% 8% 64%	3965
April	1st to 10th	Day	3 2 1 2 3 4 3 4 5% 7% 67%	2280
	11th to 20th	Day	2 2 1 2 2 3 3 3 5% 6% 73%	2254
	21st to end	Day	3 2 1 2 2 2 2 2 4 6% 73%	2280
May	1st to 10th	Day	1 1 1 2 2 2 2 2 3 6% 79%	3765
	11th to 20th	Day	2 2 1 3 2 2 3 2 4 5% 73%	3765
	21st to end	Day	1 1 2 2 2 2 2 3 5% 81%	4130
June	1st to 10th	Day	1 1 1 2 2 2 3 3 5% 9% 71%	2280
	11th to 20th	Day	1 2 1 3 3 3 4 4 6% 8% 67%	2280
	21st to end	Day	3 2 1 3 4 3 4 4 7% 10% 58%	2280
July	1st to 10th	Day	3 3 2 4 4 4 6% 5% 7% 11% 50%	3800
	11th to 20th	Day	4 3 1 4 4 6% 6% 5% 8% 12% 48%	3800
	21st to end	Day	3 3 1 4 4 4 6% 5% 8% 12% 51%	4117
August	1st to 10th	Day	1 2 1 3 3 3 4 5% 8% 11% 60%	3785
	11th to 20th	Day	3 2 1 3 3 4 5% 5% 8% 10% 54%	3726
	21st to end	Day	3 2 1 4 4 4 5% 4 7% 11% 54%	4180
September	1st to 10th	Day	6% 4 2 7% 5% 6% 6% 5% 7% 10% 41%	2280
	11th to 20th	Day	7% 5% 2 6% 4 4 4 4 7% 8% 49%	2254
	21st to end	Day	6% 4 1 4 3 4 4 3 5% 6% 60%	2090
October	1st to 10th	Day	4 2 1 3 3 3 4 3 7% 8% 65%	2000
	11th to 20th	Day	4 3 1 3 2 3 3 2 4 7% 68%	1900
	21st to end	Day	4 3 1 2 1 1 1 2 2 4 78%	2090
November	1st to 10th	Day	4 3 1 2 2 2 2 2 4 5% 74%	1959
	11th to 20th	Day	4 3 1 3 2 2 2 2 4 5% 72%	2000
	21st to end	Day	5% 4 1 4 4 3 3 3 5% 6% 62%	1940
December	1st to 10th	Day	5% 4 2 4 2 3 3 3 4 6% 64%	1900
	11th to 20th	Day	3 4 2 4 3 3 3 4 6% 10% 58%	2404
	21st to end	Day	2 2 1 3 2 3 3 3 5% 8% 67%	3487
January	1st to 10th	Night	2 2 1 2 2 2 2 2 3 6% 77%	3788
	11th to 20th	Night	3 2 1 2 2 2 2 3 4 6% 73%	3800
	21st to end	Night	7% 6% 2 6% 4 3 3 3 5% 7% 53%	4180
February	1st to 10th	Night	5% 3 1 3 3 3 2 3 5% 6% 65%	2280
	11th to 20th	Night	4 6% 1 3 3 3 3 3 5% 6% 62%	2218
	21st to end	Night	4 4 1 3 3 4 4 3 4 7% 64%	1884
March	1st to 10th	Night	5% 5% 2 4 3 3 4 3 5% 5% 61%	3493
	11th to 20th	Night	4 4 1 4 3 3 4 4 5% 7% 60%	3490
	21st to end	Night	4 6% 2 4 3 3 3 3 4 5% 64%	3680
April	1st to 10th	Night	4 4 2 3 3 2 3 3 5% 6% 65%	1900
	11th to 20th	Night	5% 3 2 4 2 2 4 3 4 6% 65%	1877
	21st to end	Night	5% 4 1 3 2 2 3 3 5% 6% 65%	1900
May	1st to 10th	Night	3 2 1 2 2 2 2 2 4 8% 71%	3140
	11th to 20th	Night	4 4 1 4 3 3 3 3 5% 6% 65%	3140
	21st to end	Night	2 3 1 4 3 3 4 3 4 6% 66%	3437
June	1st to 10th	Night	4 3 2 6% 5% 6% 6% 6% 8% 7% 46%	1900
	11th to 20th	Night	3 5% 2 8% 7% 6% 7% 6% 8% 10% 38%	1900
	21st to end	Night	6% 7% 3 8% 6% 6% 7% 6% 7% 10% 33%	1900
July	1st to 10th	Night	7% 8% 5% 12% 8% 7% 7% 6% 7% 8% 25%	3170
	11th to 20th	Night	5% 5% 3 9% 8% 7% 7% 6% 9% 11% 30%	3170
	21st to end	Night	7% 7% 4 9% 7% 7% 6% 6% 7% 9% 31%	3446
August	1st to 10th	Night	5% 6% 3 10% 8% 8% 9% 7% 10% 9% 26%	3155
	11th to 20th	Night	5% 6% 3 11% 9% 8% 8% 7% 9% 10% 23%	3113
	21st to end	Night	6% 6% 3 9% 7% 7% 7% 7% 9% 12% 29%	3487
September	1st to 10th	Night	10% 8% 4 9% 7% 8% 7% 6% 7% 9% 24%	1900
	11th to 20th	Night	12% 8% 3 8% 6% 6% 5% 6% 7% 9% 30%	1924
	21st to end	Night	8% 5% 3 9% 6% 6% 6% 5% 6% 9% 36%	2090
October	1st to 10th	Night	5% 4 2 6% 4 5% 5% 3 7% 7% 53%	2173
	11th to 20th	Night	8% 4 2 5% 3 4 4 3 5% 7% 55%	2280
	21st to end	Night	4 2 1 3 3 2 2 2 4 5% 72%	2508
November	1st to 10th	Night	5% 1 1 2 1 2 2 1 3 5% 77%	2340
	11th to 20th	Night	5% 2 1 4 3 3 3 2 4 5% 69%	2400
	21st to end	Night	5% 4 1 3 3 3 3 2 4 5% 66%	2334
December	1st to 10th	Night	4 3 1 3 3 3 3 3 5% 7% 66%	2280
	11th to 20th	Night	3 4 1 3 3 3 4 3 5% 9% 63%	2806
	21st to end	Night	4 3 1 4 3 3 3 3 5% 7% 64%	4180

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	12% 2 4 13% 30% 38%	3168
	11th to 20th	Day	14% 2 2 17% 35% 31%	3170
	21st to end	Day	25% 3 7% 21% 28% 16%	3487
February	1st to 10th	Day	22% 2 4 10% 28% 33%	1900
	11th to 20th	Day	20% 3 4 14% 28% 31%	1859
	21st to end	Day	15% 4 2 13% 33% 32%	1570
March	1st to 10th	Day	20% 3 3 13% 28% 33%	3374
	11th to 20th	Day	17% 4 3 11% 25% 40%	3490
	21st to end	Day	14% 5% 2 8% 29% 42%	3965
April	1st to 10th	Day	17% 3 3 10% 23% 45%	2280
	11th to 20th	Day	13% 3 2 10% 23% 48%	2254
	21st to end	Day	14% 2 1 7% 26% 50%	2280
May	1st to 10th	Day	10% 2 1 6% 19% 63%	3800
	11th to 20th	Day	14% 3 4 9% 21% 50%	3768
	21st to end	Day	8% 2 2 9% 21% 59%	4141
June	1st to 10th	Day	11% 3 4 19% 32% 31%	2280
	11th to 20th	Day	15% 4 4 16% 31% 31%	2280
	21st to end	Day	20% 5% 10% 24% 24% 16%	2280
July	1st to 10th	Day	25% 8% 18% 25% 15% 8%	3741
	11th to 20th	Day	26% 6% 19% 31% 14% 4	3737
	21st to end	Day	22% 8% 18% 27% 19% 6%	3988
August	1st to 10th	Day	16% 6% 17% 38% 21% 2	3772
	11th to 20th	Day	21% 7% 21% 32% 16% 2	3762
	21st to end	Day	23% 7% 17% 32% 18% 3	4179
September	1st to 10th	Day	36% 8% 16% 21% 11% 8%	2280
	11th to 20th	Day	31% 6% 13% 18% 22% 10%	2254
	21st to end	Day	23% 5% 10% 23% 24% 14%	2090
October	1st to 10th	Day	12% 2 6% 13% 28% 38%	3330
	11th to 20th	Day	12% 2 6% 20% 27% 33%	3150
	21st to end	Day	8% 1 1 12% 43% 34%	3438
November	1st to 10th	Day	15% 2 5% 17% 37% 24%	1959
	11th to 20th	Day	17% 2 6% 19% 31% 24%	2000
	21st to end	Day	22% 3 6% 21% 22% 25%	1940
December	1st to 10th	Day	22% 2 7% 21% 33% 15%	1900
	11th to 20th	Day	22% 5% 6% 20% 33% 15%	2403
	21st to end	Day	16% 3 4 16% 35% 25%	3487
January	1st to 10th	Night	13% 2 3 11% 36% 35%	3788
	11th to 20th	Night	14% 2 4 12% 35% 34%	3800
	21st to end	Night	30% 4 5% 19% 26% 17%	4180
February	1st to 10th	Night	20% 3 3 13% 27% 34%	2280
	11th to 20th	Night	24% 3 3 12% 25% 33%	2218
	21st to end	Night	21% 4 2 10% 30% 34%	1884
March	1st to 10th	Night	24% 3 2 10% 28% 33%	3493
	11th to 20th	Night	21% 4 6% 9% 26% 35%	3490
	21st to end	Night	22% 5% 2 7% 25% 40%	3680
April	1st to 10th	Night	20% 3 3 9% 25% 40%	1900
	11th to 20th	Night	20% 3 4 8% 24% 41%	1877
	21st to end	Night	20% 3 4 9% 22% 43%	1900
May	1st to 10th	Night	14% 2 2 8% 16% 57%	3170
	11th to 20th	Night	19% 4 3 9% 20% 45%	3141
	21st to end	Night	17% 4 4 9% 18% 48%	3447
June	1st to 10th	Night	30% 6% 10% 17% 19% 18%	1900
	11th to 20th	Night	36% 7% 7% 13% 19% 18%	1900
	21st to end	Night	42% 7% 11% 17% 12% 12%	1900
July	1st to 10th	Night	53% 8% 14% 13% 9% 3	3120
	11th to 20th	Night	43% 8% 17% 21% 8% 3	3110
	21st to end	Night	44% 7% 13% 15% 15% 5%	3336
August	1st to 10th	Night	45% 9% 13% 19% 12% 1	3144
	11th to 20th	Night	51% 8% 14% 18% 8% 1	3143
	21st to end	Night	42% 8% 14% 22% 12% 3	3487
September	1st to 10th	Night	51% 9% 14% 13% 8% 5%	1900
	11th to 20th	Night	48% 8% 11% 12% 12% 9%	1924
	21st to end	Night	40% 7% 10% 15% 14% 14%	2090
October	1st to 10th	Night	20% 4 7% 11% 18% 41%	3628
	11th to 20th	Night	22% 3 7% 17% 20% 31%	3778
	21st to end	Night	11% 2 2 13% 39% 32%	4120
November	1st to 10th	Night	12% 2 5% 17% 36% 27%	2340
	11th to 20th	Night	18% 3 7% 18% 27% 27%	2400
	21st to end	Night	22% 4 6% 17% 25% 27%	2334
December	1st to 10th	Night	19% 3 7% 21% 34% 17%	2280
	11th to 20th	Night	20% 3 6% 19% 36% 16%	2806
	21st to end	Night	21% 3 3 13% 34% 26%	4180

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% 4 26% 39% 19% 4	270
	11th to 20th	Day	4 4 18% 46% 25% 3	270
	21st to end	Day	6% 5% 29% 38% 17% 4	297
February	1st to 10th	Day	11% 5% 23% 33% 20% 7%	270
	11th to 20th	Day	12% 6% 27% 35% 19% 2	270
	21st to end	Day	7% 8% 35% 32% 16% 3	225
March	1st to 10th	Day	7% 12% 33% 28% 18% 2	412
	11th to 20th	Day	8% 11% 26% 35% 17% 3	460
	21st to end	Day	9% 14% 28% 33% 14% 2	506
April	1st to 10th	Day	6% 12% 28% 33% 17% 4	460
	11th to 20th	Day	4 12% 37% 27% 16% 3	452
	21st to end	Day	5% 12% 29% 33% 18% 3	460
May	1st to 10th	Day	5% 9% 29% 34% 20% 4	463
	11th to 20th	Day	3 6% 24% 39% 23% 5%	488
	21st to end	Day	3 4 22% 40% 24% 8%	529
June	1st to 10th	Day	3 1 11% 36% 33% 15%	490
	11th to 20th	Day	3 1 7% 30% 41% 17%	490
	21st to end	Day	4 1 3 29% 36% 27%	490
July	1st to 10th	Day	6% 2 2 22% 38% 30%	486
	11th to 20th	Day	3 1 2 23% 43% 27%	484
	21st to end	Day	2 1 3 21% 41% 32%	531
August	1st to 10th	Day	1 1 2 15% 44% 37%	487
	11th to 20th	Day	5% 2 2 17% 35% 38%	477
	21st to end	Day	5% 1 2 17% 37% 38%	539
September	1st to 10th	Day	6% 2 4 19% 38% 31%	490
	11th to 20th	Day	8% 1 3 17% 39% 31%	464
	21st to end	Day	6% 1 3 15% 42% 32%	300
October	1st to 10th	Day	7% 2 7% 21% 37% 27%	300
	11th to 20th	Day	6% 3 9% 22% 38% 22%	300
	21st to end	Day	8% 3 15% 23% 35% 18%	330
November	1st to 10th	Day	3 2 13% 34% 35% 13%	300
	11th to 20th	Day	6% 1 14% 31% 33% 14%	300
	21st to end	Day	12% 5% 19% 35% 21% 9%	282
December	1st to 10th	Day	9% 3 16% 32% 32% 8%	270
	11th to 20th	Day	5% 3 28% 40% 19% 5%	270
	21st to end	Day	4 5% 27% 38% 21% 4	297
January	1st to 10th	Night	7% 3 19% 52% 19% 1	760
	11th to 20th	Night	6% 2 18% 54% 20% 1	760
	21st to end	Night	6% 5% 25% 50% 14% 1	836
February	1st to 10th	Night	6% 4 25% 46% 18% 1	760
	11th to 20th	Night	8% 4 27% 49% 11%	744
	21st to end	Night	6% 6% 32% 47% 9%	628
March	1st to 10th	Night	8% 6% 33% 44% 8% 1	760
	11th to 20th	Night	9% 6% 28% 45% 12%	760
	21st to end	Night	7% 8% 32% 44% 10%	752
April	1st to 10th	Night	6% 8% 38% 39% 8%	570
	11th to 20th	Night	7% 8% 38% 42% 6%	563
	21st to end	Night	7% 7% 39% 41% 6%	570
May	1st to 10th	Night	7% 8% 38% 39% 8%	570
	11th to 20th	Night	5% 4 37% 43% 11%	561
	21st to end	Night	4 5% 29% 48% 14%	617
June	1st to 10th	Night	6% 2 17% 49% 24% 2	570
	11th to 20th	Night	5% 2 15% 46% 31% 1	570
	21st to end	Night	9% 2 9% 42% 34% 3	570
July	1st to 10th	Night	9% 1 6% 37% 40% 6%	555
	11th to 20th	Night	6% 2 5% 38% 44% 4	552
	21st to end	Night	8% 2 5% 32% 46% 7%	624
August	1st to 10th	Night	8% 3 2 30% 47% 11%	567
	11th to 20th	Night	9% 2 4 27% 46% 12%	564
	21st to end	Night	8% 3 3 29% 51% 7%	627
September	1st to 10th	Night	13% 2 2 28% 48% 6%	570
	11th to 20th	Night	16% 2 3 26% 48% 5%	570
	21st to end	Night	10% 2 6% 36% 42% 3	570
October	1st to 10th	Night	6% 1 9% 43% 38% 3	653
	11th to 20th	Night	10% 1 11% 42% 34% 2	760
	21st to end	Night	6% 3 9% 46% 33% 3	836
November	1st to 10th	Night	6% 14% 42% 35% 2	780
	11th to 20th	Night	6% 2 13% 49% 29% 2	800
	21st to end	Night	7% 2 21% 46% 23% 2	778
December	1st to 10th	Night	6% 1 15% 50% 27% 1	760
	11th to 20th	Night	6% 1 19% 52% 21% 2	760
	21st to end	Night	6% 2 22% 49% 18% 2	836

Page generated at 2024-11-22 06:02:26. Version ac07

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