Corrales
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Corrales clear sky chart from 2005-11-06 to 2024-11-02.

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 4 6% 8% 62%	100836
	Night	5% 5% 2 4 3 4 4 3 5% 7% 58%	98385
Transparency	Day	19% 6% 9% 22% 27% 17%	100599
	Night	24% 6% 9% 21% 25% 16%	98211
Seeing	Day	7% 14% 26% 31% 18% 3	14998
	Night	6% 8% 26% 40% 18% 2	25151

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	3 7% 3 4 2 2 3 4 5% 7% 59%	2858
	11th to 20th	Day	3 5% 1 2 2 3 3 3 5% 7% 68%	2860
	21st to end	Day	4 7% 2 5% 4 4 5% 3 5% 7% 53%	3146
February	1st to 10th	Day	3 7% 2 4 3 3 3 3 5% 6% 61%	1710
	11th to 20th	Day	4 6% 2 5% 3 3 3 3 6% 7% 60%	1843
	21st to end	Day	3 6% 1 4 4 2 3 2 4 6% 63%	1570
March	1st to 10th	Day	3 4 1 3 3 3 3 3 5% 6% 67%	3374
	11th to 20th	Day	5% 8% 2 6% 4 4 4 3 6% 8% 51%	3490
	21st to end	Day	3 6% 2 5% 3 3 3 3 6% 7% 59%	3907
April	1st to 10th	Day	3 4 1 3 3 3 3 3 5% 7% 67%	2280
	11th to 20th	Day	4 3 1 4 3 3 3 2 5% 6% 66%	2251
	21st to end	Day	3 3 1 3 2 3 3 3 5% 6% 68%	2280
May	1st to 10th	Day	2 2 1 2 2 3 3 2 4 7% 73%	3800
	11th to 20th	Day	3 3 1 4 3 4 5% 4 6% 9% 59%	3931
	21st to end	Day	2 1 1 2 2 2 2 2 3 5% 79%	4749
June	1st to 10th	Day	2 2 1 3 2 3 4 4 7% 9% 64%	2660
	11th to 20th	Day	2 2 1 2 2 2 2 2 5% 6% 73%	2660
	21st to end	Day	4 3 1 4 3 4 4 3 6% 8% 59%	2660
July	1st to 10th	Day	2 2 1 3 3 4 5% 4 6% 9% 61%	4208
	11th to 20th	Day	1 2 1 3 3 3 5% 5% 9% 13% 55%	4110
	21st to end	Day	3 3 1 4 4 5% 7% 7% 11% 12% 43%	4454
August	1st to 10th	Day	2 2 1 3 4 4 5% 6% 10% 12% 51%	4032
	11th to 20th	Day	2 2 1 3 3 3 4 3 7% 10% 62%	3726
	21st to end	Day	3 2 2 5% 4 5% 6% 6% 8% 11% 48%	4180
September	1st to 10th	Day	5% 3 1 3 3 4 4 4 7% 7% 57%	2280
	11th to 20th	Day	5% 3 1 4 3 3 4 4 6% 6% 62%	2280
	21st to end	Day	3 2 1 3 2 2 3 3 4 5% 72%	2043
October	1st to 10th	Day	6% 2 1 3 3 3 3 3 5% 5% 64%	1900
	11th to 20th	Day	3 2 1 3 2 2 2 2 4 4 75%	1900
	21st to end	Day	4 3 1 2 2 1 2 2 2 5% 75%	2090
November	1st to 10th	Day	3 2 1 2 2 2 2 2 4 7% 73%	1869
	11th to 20th	Day	3 3 1 2 2 2 3 3 4 6% 72%	1715
	21st to end	Day	4 5% 2 4 3 3 4 2 4 5% 66%	1710
December	1st to 10th	Day	4 5% 1 4 3 2 3 3 3 6% 66%	1530
	11th to 20th	Day	5% 4 2 5% 3 4 4 4 7% 7% 55%	1926
	21st to end	Day	5% 6% 2 4 3 2 2 2 4 7% 64%	2854
January	1st to 10th	Night	3 10% 3 5% 3 3 3 3 5% 6% 56%	4097
	11th to 20th	Night	5% 4 1 3 2 3 3 2 3 6% 69%	4110
	21st to end	Night	7% 8% 2 5% 4 3 4 3 5% 8% 51%	4521
February	1st to 10th	Night	3 7% 1 4 2 2 3 2 4 7% 64%	2470
	11th to 20th	Night	6% 6% 2 4 4 3 3 3 5% 6% 59%	2223
	21st to end	Night	4 6% 2 4 2 2 3 3 4 5% 66%	1884
March	1st to 10th	Night	5% 5% 2 4 3 3 3 2 4 4 66%	3494
	11th to 20th	Night	11% 8% 2 5% 4 4 4 3 4 5% 49%	3490
	21st to end	Night	4 5% 1 4 4 3 3 3 4 6% 62%	3743
April	1st to 10th	Night	5% 3 2 4 2 3 3 2 4 7% 65%	1900
	11th to 20th	Night	5% 5% 2 5% 3 3 3 2 4 5% 63%	1877
	21st to end	Night	6% 3 1 3 3 3 3 3 5% 6% 65%	1900
May	1st to 10th	Night	5% 3 1 4 3 3 3 3 4 6% 64%	3170
	11th to 20th	Night	6% 5% 2 5% 4 5% 4 4 5% 7% 53%	2971
	21st to end	Night	4 2 1 3 2 3 3 3 4 4 71%	2834
June	1st to 10th	Night	2 2 1 3 3 4 4 4 7% 10% 58%	1520
	11th to 20th	Night	3 2 1 3 3 3 3 3 4 7% 69%	1520
	21st to end	Night	5% 4 2 5% 3 5% 5% 6% 7% 10% 49%	1520
July	1st to 10th	Night	3 2 1 5% 4 4 5% 6% 8% 7% 55%	2755
	11th to 20th	Night	3 3 2 7% 6% 6% 6% 6% 10% 13% 39%	2860
	21st to end	Night	5% 5% 2 6% 6% 6% 7% 6% 10% 12% 34%	3109
August	1st to 10th	Night	2 3 2 9% 7% 7% 9% 7% 10% 13% 31%	2903
	11th to 20th	Night	3 3 1 6% 5% 6% 6% 6% 9% 11% 44%	3113
	21st to end	Night	4 3 2 7% 7% 7% 8% 7% 11% 11% 34%	3487
September	1st to 10th	Night	5% 3 2 5% 5% 5% 5% 5% 6% 9% 50%	1900
	11th to 20th	Night	5% 3 1 4 3 3 4 4 5% 7% 60%	1900
	21st to end	Night	4 3 1 3 2 3 3 3 4 6% 67%	2131
October	1st to 10th	Night	6% 4 1 4 3 3 3 3 5% 6% 62%	2280
	11th to 20th	Night	4 1 1 2 2 2 2 2 3 5% 75%	2280
	21st to end	Night	4 3 1 3 2 2 3 2 3 4 74%	2508
November	1st to 10th	Night	3 2 1 2 2 2 2 2 4 4 77%	2244
	11th to 20th	Night	3 2 1 2 1 2 2 2 4 5% 74%	2444
	21st to end	Night	6% 6% 2 3 3 3 3 2 4 5% 64%	2470
December	1st to 10th	Night	5% 4 1 4 2 2 3 3 4 6% 66%	2645
	11th to 20th	Night	5% 5% 2 4 3 4 3 3 6% 8% 57%	3271
	21st to end	Night	6% 7% 2 4 3 3 3 2 4 5% 61%	4841

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	24% 5% 7% 36% 25% 3	2859
	11th to 20th	Day	18% 5% 14% 37% 23% 3	2860
	21st to end	Day	31% 6% 8% 25% 25% 5%	3146
February	1st to 10th	Day	24% 5% 8% 26% 27% 10%	1710
	11th to 20th	Day	24% 3 7% 26% 28% 11%	1853
	21st to end	Day	22% 4 4 19% 31% 19%	1570
March	1st to 10th	Day	17% 5% 4 18% 37% 18%	3374
	11th to 20th	Day	26% 8% 10% 23% 25% 9%	3490
	21st to end	Day	22% 6% 6% 20% 34% 12%	3907
April	1st to 10th	Day	18% 4 5% 17% 36% 20%	2280
	11th to 20th	Day	20% 4 4 17% 31% 24%	2254
	21st to end	Day	17% 4 6% 20% 34% 19%	2280
May	1st to 10th	Day	10% 5% 5% 16% 36% 28%	3800
	11th to 20th	Day	18% 6% 9% 21% 30% 15%	3934
	21st to end	Day	9% 3 4 11% 24% 48%	4749
June	1st to 10th	Day	14% 5% 8% 20% 27% 26%	2660
	11th to 20th	Day	12% 4 4 12% 23% 45%	2660
	21st to end	Day	22% 4 7% 21% 22% 25%	2660
July	1st to 10th	Day	19% 7% 10% 14% 21% 29%	4144
	11th to 20th	Day	16% 8% 16% 32% 22% 6%	4041
	21st to end	Day	25% 11% 16% 32% 15% 2	4314
August	1st to 10th	Day	20% 9% 20% 27% 17% 7%	4018
	11th to 20th	Day	16% 6% 11% 26% 26% 15%	3762
	21st to end	Day	27% 8% 18% 23% 19% 5%	4179
September	1st to 10th	Day	24% 7% 10% 20% 25% 15%	2280
	11th to 20th	Day	21% 5% 10% 17% 27% 21%	2280
	21st to end	Day	15% 3 6% 22% 33% 21%	2043
October	1st to 10th	Day	21% 5% 8% 19% 25% 22%	1900
	11th to 20th	Day	14% 3 4 14% 37% 28%	1900
	21st to end	Day	15% 3 6% 20% 37% 18%	2090
November	1st to 10th	Day	13% 3 5% 23% 39% 17%	1869
	11th to 20th	Day	15% 4 7% 24% 39% 12%	1715
	21st to end	Day	23% 3 4 23% 34% 14%	1710
December	1st to 10th	Day	21% 3 8% 34% 23% 10%	1530
	11th to 20th	Day	27% 7% 10% 25% 26% 6%	1924
	21st to end	Day	22% 4 7% 24% 30% 13%	2854
January	1st to 10th	Night	28% 6% 8% 28% 24% 5%	4097
	11th to 20th	Night	20% 3 9% 37% 25% 6%	4110
	21st to end	Night	30% 5% 9% 24% 26% 5%	4521
February	1st to 10th	Night	22% 3 10% 23% 30% 11%	2470
	11th to 20th	Night	27% 4 5% 23% 27% 13%	2223
	21st to end	Night	21% 4 3 18% 34% 19%	1884
March	1st to 10th	Night	20% 5% 4 16% 38% 16%	3494
	11th to 20th	Night	33% 7% 8% 20% 23% 9%	3490
	21st to end	Night	19% 8% 6% 23% 32% 11%	3743
April	1st to 10th	Night	21% 4 4 17% 33% 21%	1900
	11th to 20th	Night	23% 4 4 15% 28% 26%	1877
	21st to end	Night	20% 5% 7% 16% 33% 18%	1900
May	1st to 10th	Night	16% 7% 6% 13% 29% 29%	3170
	11th to 20th	Night	26% 8% 12% 19% 20% 16%	2972
	21st to end	Night	13% 6% 5% 9% 18% 48%	2834
June	1st to 10th	Night	19% 7% 11% 17% 19% 26%	1520
	11th to 20th	Night	15% 4 5% 12% 22% 42%	1520
	21st to end	Night	27% 7% 11% 14% 15% 25%	1520
July	1st to 10th	Night	25% 7% 11% 15% 13% 30%	2710
	11th to 20th	Night	30% 8% 17% 29% 11% 5%	2806
	21st to end	Night	36% 9% 17% 27% 9% 1	3011
August	1st to 10th	Night	38% 9% 17% 17% 12% 6%	2894
	11th to 20th	Night	29% 8% 16% 16% 17% 15%	3143
	21st to end	Night	37% 9% 18% 18% 13% 5%	3487
September	1st to 10th	Night	27% 6% 14% 18% 21% 14%	1900
	11th to 20th	Night	22% 5% 11% 16% 22% 23%	1900
	21st to end	Night	18% 4 6% 16% 29% 26%	2131
October	1st to 10th	Night	23% 4 8% 17% 23% 25%	2280
	11th to 20th	Night	14% 3 5% 13% 31% 33%	2280
	21st to end	Night	16% 3 4 19% 38% 20%	2508
November	1st to 10th	Night	12% 2 4 21% 41% 19%	2244
	11th to 20th	Night	14% 3 5% 22% 40% 17%	2444
	21st to end	Night	25% 2 5% 19% 34% 16%	2470
December	1st to 10th	Night	20% 4 7% 30% 31% 9%	2645
	11th to 20th	Night	25% 5% 8% 25% 28% 8%	3272
	21st to end	Night	25% 5% 6% 23% 31% 9%	4841

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	5% 14% 42% 32% 7%	270
	11th to 20th	Day	13% 18% 27% 32% 10%	270
	21st to end	Day	5% 16% 36% 30% 12%	297
February	1st to 10th	Day	7% 22% 36% 26% 9%	270
	11th to 20th	Day	12% 19% 43% 23% 4	270
	21st to end	Day	16% 26% 34% 20% 4	225
March	1st to 10th	Day	13% 26% 31% 23% 7%	412
	11th to 20th	Day	18% 23% 29% 20% 9% 1	460
	21st to end	Day	17% 34% 27% 15% 6%	506
April	1st to 10th	Day	11% 28% 37% 16% 8% 1	460
	11th to 20th	Day	15% 30% 33% 17% 4 1	452
	21st to end	Day	9% 28% 37% 20% 5%	460
May	1st to 10th	Day	9% 25% 41% 19% 5% 1	463
	11th to 20th	Day	6% 17% 38% 27% 10% 1	488
	21st to end	Day	6% 19% 31% 30% 13% 1	684
June	1st to 10th	Day	3 8% 24% 43% 21% 2	680
	11th to 20th	Day	4 9% 24% 37% 24% 2	680
	21st to end	Day	5% 7% 22% 35% 28% 3	680
July	1st to 10th	Day	3 4 17% 41% 30% 5%	545
	11th to 20th	Day	3 1 9% 36% 37% 14%	484
	21st to end	Day	2 2 7% 34% 45% 9%	531
August	1st to 10th	Day	3 2 10% 40% 37% 8%	487
	11th to 20th	Day	5% 2 15% 38% 34% 6%	477
	21st to end	Day	4 3 16% 39% 33% 6%	539
September	1st to 10th	Day	5% 4 16% 39% 30% 6%	490
	11th to 20th	Day	3 5% 27% 39% 22% 4	490
	21st to end	Day	5% 8% 25% 34% 22% 6%	348
October	1st to 10th	Day	7% 12% 20% 30% 26% 6%	300
	11th to 20th	Day	7% 11% 27% 31% 19% 5%	300
	21st to end	Day	12% 10% 22% 35% 16% 4	330
November	1st to 10th	Day	7% 16% 30% 34% 12% 1	273
	11th to 20th	Day	3 11% 30% 37% 19%	270
	21st to end	Day	9% 20% 31% 28% 10% 2	270
December	1st to 10th	Day	10% 15% 35% 31% 9%	270
	11th to 20th	Day	10% 13% 32% 36% 8%	270
	21st to end	Day	15% 16% 36% 29% 4	297
January	1st to 10th	Night	6% 5% 31% 42% 15% 1	760
	11th to 20th	Night	8% 8% 31% 39% 14% 1	760
	21st to end	Night	7% 10% 29% 38% 14% 1	836
February	1st to 10th	Night	7% 10% 33% 38% 11% 1	760
	11th to 20th	Night	8% 12% 37% 35% 8%	744
	21st to end	Night	11% 11% 39% 35% 4	628
March	1st to 10th	Night	9% 13% 35% 33% 11%	760
	11th to 20th	Night	10% 12% 30% 37% 12%	760
	21st to end	Night	9% 15% 30% 37% 9%	789
April	1st to 10th	Night	7% 18% 36% 32% 6%	570
	11th to 20th	Night	9% 21% 32% 32% 7%	563
	21st to end	Night	8% 16% 36% 34% 5% 1	570
May	1st to 10th	Night	5% 15% 35% 36% 9% 1	570
	11th to 20th	Night	8% 11% 31% 35% 14% 1	561
	21st to end	Night	6% 11% 30% 41% 12%	617
June	1st to 10th	Night	2 5% 29% 48% 15% 1	570
	11th to 20th	Night	3 6% 29% 46% 16% 1	570
	21st to end	Night	5% 4 22% 44% 24% 1	570
July	1st to 10th	Night	3 2 15% 44% 32% 3	555
	11th to 20th	Night	3 2 12% 38% 40% 5%	552
	21st to end	Night	3 3 7% 39% 42% 6%	624
August	1st to 10th	Night	4 2 6% 34% 47% 7%	567
	11th to 20th	Night	6% 2 12% 45% 31% 3	564
	21st to end	Night	4 1 10% 42% 38% 4	627
September	1st to 10th	Night	5% 2 16% 46% 29% 2	570
	11th to 20th	Night	5% 2 16% 48% 26% 2	570
	21st to end	Night	5% 3 20% 45% 25% 1	660
October	1st to 10th	Night	6% 5% 23% 45% 20% 2	760
	11th to 20th	Night	4 6% 23% 46% 19% 2	760
	21st to end	Night	6% 7% 24% 40% 19% 4	836
November	1st to 10th	Night	4 5% 24% 44% 20% 1	748
	11th to 20th	Night	3 7% 26% 44% 18% 2	924
	21st to end	Night	8% 12% 23% 35% 20% 2	950
December	1st to 10th	Night	7% 8% 29% 41% 14% 1	950
	11th to 20th	Night	9% 10% 29% 40% 12% 1	950
	21st to end	Night	11% 10% 30% 40% 9% 1	1026

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