Aqua Fria Peak
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Aqua Fria Peak 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 5% 2 5% 4 4 5% 4 6% 8% 53%	101000
	Night	2 4 2 5% 3 3 4 4 6% 8% 59%	98207
Transparency	Day	25% 7% 14% 18% 23% 13%	100753
	Night	21% 7% 16% 21% 24% 12%	98044
Seeing	Day	15% 21% 29% 22% 10% 2	15265
	Night	10% 19% 31% 26% 13% 2	25300

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	4 2 6% 3 3 3 4 9% 9% 57%	2579
	11th to 20th	Day	1 3 1 3 3 3 3 3 6% 7% 67%	2860
	21st to end	Day	1 8% 3 7% 5% 4 4 3 6% 6% 52%	3146
February	1st to 10th	Day	4 2 7% 4 3 5% 3 6% 8% 58%	1777
	11th to 20th	Day	1 4 2 6% 4 2 3 4 6% 6% 62%	1849
	21st to end	Day	4 3 6% 4 4 3 3 6% 7% 59%	1570
March	1st to 10th	Day	1 4 3 5% 3 3 3 3 6% 8% 62%	3152
	11th to 20th	Day	3 14% 5% 8% 4 4 5% 4 5% 7% 41%	3490
	21st to end	Day	1 7% 2 4 3 4 4 4 6% 8% 57%	4033
April	1st to 10th	Day	1 6% 2 4 3 4 5% 4 8% 7% 58%	2280
	11th to 20th	Day	3 7% 2 4 3 3 5% 4 5% 8% 56%	2251
	21st to end	Day	3 6% 2 5% 4 4 4 4 6% 9% 53%	2280
May	1st to 10th	Day	4 8% 2 4 3 3 3 3 4 6% 59%	3800
	11th to 20th	Day	8% 7% 2 6% 3 4 5% 4 6% 7% 47%	4091
	21st to end	Day	3 3 1 3 3 3 3 3 5% 8% 66%	4825
June	1st to 10th	Day	3 4 1 4 4 4 5% 5% 7% 9% 52%	2660
	11th to 20th	Day	3 2 1 4 4 4 4 5% 6% 8% 60%	2660
	21st to end	Day	6% 5% 2 5% 5% 5% 6% 6% 8% 8% 46%	2660
July	1st to 10th	Day	3 5% 2 5% 5% 6% 7% 5% 8% 8% 46%	4430
	11th to 20th	Day	4 4 1 6% 6% 8% 10% 7% 10% 9% 36%	4340
	21st to end	Day	8% 6% 3 8% 6% 6% 8% 7% 9% 9% 30%	4454
August	1st to 10th	Day	8% 6% 2 8% 7% 7% 8% 6% 8% 9% 32%	3919
	11th to 20th	Day	5% 5% 2 5% 5% 6% 6% 4 7% 8% 47%	3726
	21st to end	Day	5% 5% 2 8% 6% 8% 7% 6% 8% 9% 36%	4180
September	1st to 10th	Day	8% 6% 2 7% 5% 5% 5% 4 6% 8% 45%	2280
	11th to 20th	Day	6% 5% 2 5% 3 4 3 4 5% 7% 54%	2256
	21st to end	Day	6% 3 2 5% 3 3 4 3 5% 5% 62%	2090
October	1st to 10th	Day	7% 5% 2 4 3 4 4 3 6% 6% 57%	1933
	11th to 20th	Day	3 4 1 3 2 2 2 2 4 5% 72%	1900
	21st to end	Day	4 5% 2 4 3 2 2 2 3 4 70%	2090
November	1st to 10th	Day	1 2 1 2 2 2 4 3 5% 7% 70%	1711
	11th to 20th	Day	1 3 1 4 2 2 3 4 7% 7% 66%	1710
	21st to end	Day	1 4 2 5% 4 4 4 3 6% 6% 61%	1710
December	1st to 10th	Day	1 3 2 3 3 3 3 4 6% 9% 63%	1588
	11th to 20th	Day	1 6% 3 6% 3 3 3 3 6% 9% 59%	1926
	21st to end	Day	1 3 2 4 3 3 3 3 5% 7% 65%	2794
January	1st to 10th	Night	3 1 8% 4 4 3 3 5% 7% 60%	4403
	11th to 20th	Night	1 3 1 5% 3 3 3 3 5% 7% 67%	4110
	21st to end	Night	4 2 5% 4 4 4 3 7% 9% 58%	4521
February	1st to 10th	Night	4 2 6% 3 3 3 3 6% 9% 61%	2400
	11th to 20th	Night	1 5% 2 5% 3 2 4 3 6% 8% 61%	2218
	21st to end	Night	1 3 1 4 3 3 4 3 6% 7% 67%	1884
March	1st to 10th	Night	4 2 4 3 2 3 3 5% 5% 69%	3708
	11th to 20th	Night	3 11% 4 6% 3 3 3 3 5% 7% 53%	3490
	21st to end	Night	1 4 2 4 3 3 3 3 5% 7% 64%	3611
April	1st to 10th	Night	1 4 1 2 2 3 3 3 6% 8% 66%	1900
	11th to 20th	Night	3 6% 1 4 3 3 3 3 4 7% 63%	1877
	21st to end	Night	3 5% 2 3 3 2 3 3 6% 7% 63%	1900
May	1st to 10th	Night	3 6% 1 4 3 2 3 2 4 6% 66%	3170
	11th to 20th	Night	5% 9% 2 4 3 4 4 3 6% 8% 51%	2807
	21st to end	Night	2 3 1 3 3 2 3 3 5% 7% 69%	2762
June	1st to 10th	Night	2 3 1 4 4 3 5% 4 8% 8% 56%	1520
	11th to 20th	Night	2 2 1 3 3 3 3 4 6% 8% 65%	1520
	21st to end	Night	8% 4 1 5% 4 5% 5% 6% 7% 10% 46%	1520
July	1st to 10th	Night	4 6% 3 8% 5% 6% 7% 5% 8% 7% 41%	2540
	11th to 20th	Night	3 3 1 6% 5% 5% 7% 6% 10% 13% 42%	2625
	21st to end	Night	7% 5% 2 5% 5% 3 5% 5% 8% 10% 43%	3109
August	1st to 10th	Night	7% 5% 2 5% 5% 5% 8% 7% 11% 14% 30%	3018
	11th to 20th	Night	3 3 1 4 4 5% 6% 6% 9% 12% 46%	3113
	21st to end	Night	3 3 1 6% 5% 6% 9% 7% 12% 14% 35%	3487
September	1st to 10th	Night	6% 4 1 5% 4 3 4 4 7% 9% 53%	1900
	11th to 20th	Night	5% 3 1 3 3 3 3 4 5% 8% 61%	1922
	21st to end	Night	5% 3 1 3 2 3 3 2 5% 6% 66%	2090
October	1st to 10th	Night	4 3 1 4 3 3 4 4 4 5% 65%	2243
	11th to 20th	Night	3 3 1 3 1 2 2 2 3 5% 76%	2280
	21st to end	Night	4 4 1 3 3 2 2 2 3 5% 69%	2508
November	1st to 10th	Night	1 2 1 2 2 2 3 3 5% 6% 73%	2379
	11th to 20th	Night	2 1 2 2 3 3 3 6% 6% 73%	2470
	21st to end	Night	2 3 2 4 4 3 3 3 6% 8% 62%	2470
December	1st to 10th	Night	1 3 2 4 3 2 3 3 5% 9% 65%	2588
	11th to 20th	Night	1 4 2 5% 4 2 4 4 6% 9% 59%	3271
	21st to end	Night	3 2 5% 4 4 3 3 6% 8% 62%	4873

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	19% 6% 17% 19% 30% 9%	2580
	11th to 20th	Day	12% 5% 27% 24% 26% 6%	2860
	21st to end	Day	27% 7% 14% 19% 25% 8%	3146
February	1st to 10th	Day	23% 5% 16% 20% 23% 12%	1777
	11th to 20th	Day	21% 5% 13% 23% 25% 14%	1859
	21st to end	Day	20% 3 13% 17% 29% 17%	1570
March	1st to 10th	Day	17% 4 14% 14% 32% 19%	3152
	11th to 20th	Day	35% 5% 15% 15% 24% 6%	3490
	21st to end	Day	22% 4 16% 21% 30% 7%	4033
April	1st to 10th	Day	20% 5% 12% 21% 27% 14%	2280
	11th to 20th	Day	24% 4 12% 20% 24% 16%	2254
	21st to end	Day	24% 6% 13% 20% 27% 9%	2280
May	1st to 10th	Day	23% 5% 12% 15% 24% 22%	3800
	11th to 20th	Day	32% 7% 12% 13% 23% 12%	4095
	21st to end	Day	16% 4 10% 14% 24% 31%	4825
June	1st to 10th	Day	24% 9% 13% 19% 21% 14%	2660
	11th to 20th	Day	19% 6% 10% 14% 24% 27%	2660
	21st to end	Day	31% 8% 11% 17% 17% 15%	2660
July	1st to 10th	Day	28% 11% 12% 12% 17% 20%	4361
	11th to 20th	Day	32% 14% 17% 25% 9% 3	4265
	21st to end	Day	40% 15% 15% 20% 7% 4	4314
August	1st to 10th	Day	42% 13% 16% 17% 8% 4	3905
	11th to 20th	Day	30% 10% 15% 21% 14% 11%	3762
	21st to end	Day	36% 11% 19% 19% 13% 2	4179
September	1st to 10th	Day	34% 9% 12% 18% 19% 9%	2280
	11th to 20th	Day	28% 7% 11% 16% 23% 15%	2256
	21st to end	Day	22% 5% 10% 20% 31% 13%	2090
October	1st to 10th	Day	26% 7% 10% 17% 27% 14%	1933
	11th to 20th	Day	16% 4 6% 15% 37% 22%	1900
	21st to end	Day	19% 3 7% 19% 37% 16%	2090
November	1st to 10th	Day	12% 4 10% 21% 34% 20%	1711
	11th to 20th	Day	14% 5% 11% 27% 33% 12%	1710
	21st to end	Day	21% 4 10% 19% 29% 18%	1710
December	1st to 10th	Day	15% 6% 18% 25% 24% 12%	1588
	11th to 20th	Day	21% 7% 14% 17% 27% 14%	1924
	21st to end	Day	17% 4 14% 18% 31% 16%	2794
January	1st to 10th	Night	23% 4 16% 19% 29% 9%	4403
	11th to 20th	Night	16% 6% 28% 22% 22% 7%	4110
	21st to end	Night	20% 6% 18% 21% 27% 7%	4521
February	1st to 10th	Night	20% 5% 17% 22% 24% 12%	2400
	11th to 20th	Night	21% 5% 14% 24% 23% 12%	2218
	21st to end	Night	15% 5% 14% 18% 30% 18%	1884
March	1st to 10th	Night	16% 4 12% 14% 33% 21%	3708
	11th to 20th	Night	29% 5% 13% 22% 21% 9%	3490
	21st to end	Night	19% 4 16% 24% 31% 6%	3611
April	1st to 10th	Night	15% 6% 13% 24% 26% 16%	1900
	11th to 20th	Night	22% 5% 10% 21% 27% 16%	1877
	21st to end	Night	19% 6% 15% 24% 26% 10%	1900
May	1st to 10th	Night	18% 5% 11% 16% 27% 22%	3170
	11th to 20th	Night	28% 7% 14% 22% 18% 11%	2808
	21st to end	Night	14% 5% 12% 13% 25% 31%	2762
June	1st to 10th	Night	22% 8% 16% 21% 18% 15%	1520
	11th to 20th	Night	14% 6% 9% 18% 25% 27%	1520
	21st to end	Night	30% 7% 14% 17% 18% 15%	1520
July	1st to 10th	Night	34% 11% 15% 12% 13% 16%	2500
	11th to 20th	Night	26% 11% 25% 26% 7% 5%	2577
	21st to end	Night	31% 10% 21% 26% 11% 2	3011
August	1st to 10th	Night	35% 14% 23% 16% 7% 5%	3009
	11th to 20th	Night	26% 10% 22% 20% 18% 4	3143
	21st to end	Night	30% 13% 25% 20% 10% 2	3487
September	1st to 10th	Night	24% 9% 15% 26% 18% 7%	1900
	11th to 20th	Night	20% 7% 12% 18% 28% 14%	1922
	21st to end	Night	18% 6% 11% 23% 30% 12%	2090
October	1st to 10th	Night	20% 7% 10% 19% 29% 14%	2243
	11th to 20th	Night	13% 4 6% 17% 38% 21%	2280
	21st to end	Night	18% 3 9% 21% 34% 15%	2508
November	1st to 10th	Night	11% 5% 8% 24% 35% 17%	2379
	11th to 20th	Night	10% 5% 11% 26% 35% 14%	2470
	21st to end	Night	18% 5% 11% 20% 27% 19%	2470
December	1st to 10th	Night	15% 7% 15% 28% 24% 11%	2588
	11th to 20th	Night	19% 6% 17% 19% 27% 12%	3272
	21st to end	Night	18% 5% 17% 20% 25% 14%	4873

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	23% 28% 26% 16% 6%	270
	11th to 20th	Day	28% 27% 26% 14% 4 1	270
	21st to end	Day	12% 32% 33% 14% 6% 2	297
February	1st to 10th	Day	20% 35% 28% 14% 3	270
	11th to 20th	Day	24% 37% 25% 11% 3	270
	21st to end	Day	37% 32% 24% 6% 2	225
March	1st to 10th	Day	22% 35% 28% 12% 3	279
	11th to 20th	Day	24% 29% 30% 13% 2 1	460
	21st to end	Day	29% 37% 26% 7% 1	506
April	1st to 10th	Day	19% 38% 31% 9% 2	460
	11th to 20th	Day	24% 41% 28% 5% 1	452
	21st to end	Day	24% 32% 33% 10% 1	460
May	1st to 10th	Day	19% 35% 33% 11% 3	463
	11th to 20th	Day	15% 21% 33% 21% 9% 2	651
	21st to end	Day	13% 21% 35% 23% 7% 1	734
June	1st to 10th	Day	6% 14% 32% 31% 15% 2	680
	11th to 20th	Day	7% 17% 37% 24% 14% 2	680
	21st to end	Day	9% 12% 31% 28% 16% 4	680
July	1st to 10th	Day	7% 5% 29% 30% 24% 4	671
	11th to 20th	Day	6% 4 16% 41% 26% 7%	617
	21st to end	Day	11% 3 16% 40% 27% 5%	531
August	1st to 10th	Day	10% 5% 28% 37% 16% 4	487
	11th to 20th	Day	8% 6% 34% 33% 17% 2	477
	21st to end	Day	9% 6% 28% 38% 17% 2	539
September	1st to 10th	Day	9% 8% 29% 36% 15% 3	490
	11th to 20th	Day	7% 11% 41% 29% 11% 2	466
	21st to end	Day	8% 20% 30% 26% 13% 3	300
October	1st to 10th	Day	11% 24% 24% 26% 13% 2	300
	11th to 20th	Day	13% 27% 31% 17% 9% 3	300
	21st to end	Day	20% 23% 29% 20% 6% 1	330
November	1st to 10th	Day	16% 26% 32% 21% 4	273
	11th to 20th	Day	14% 26% 30% 20% 9% 1	270
	21st to end	Day	13% 35% 27% 16% 7% 2	270
December	1st to 10th	Day	20% 31% 27% 16% 5% 1	270
	11th to 20th	Day	17% 34% 28% 15% 4	270
	21st to end	Day	29% 32% 24% 12% 3	297
January	1st to 10th	Night	14% 24% 29% 23% 8% 2	936
	11th to 20th	Night	15% 23% 32% 21% 6% 3	760
	21st to end	Night	7% 30% 34% 21% 8% 1	836
February	1st to 10th	Night	11% 28% 39% 17% 4	760
	11th to 20th	Night	14% 28% 39% 16% 3	744
	21st to end	Night	16% 32% 39% 11% 1	628
March	1st to 10th	Night	13% 30% 34% 17% 6% 1	760
	11th to 20th	Night	11% 22% 33% 27% 8%	760
	21st to end	Night	15% 29% 38% 15% 3	709
April	1st to 10th	Night	13% 30% 40% 15% 3	570
	11th to 20th	Night	13% 25% 36% 21% 5%	563
	21st to end	Night	12% 25% 37% 20% 4	570
May	1st to 10th	Night	9% 21% 38% 25% 6%	570
	11th to 20th	Night	10% 17% 30% 26% 15% 1	561
	21st to end	Night	9% 18% 34% 32% 7%	617
June	1st to 10th	Night	4 8% 29% 41% 16% 1	570
	11th to 20th	Night	3 8% 41% 36% 11% 1	570
	21st to end	Night	8% 6% 26% 35% 24% 1	570
July	1st to 10th	Night	6% 3 18% 41% 28% 3	555
	11th to 20th	Night	3 2 8% 43% 40% 4	552
	21st to end	Night	7% 2 10% 34% 38% 8%	624
August	1st to 10th	Night	8% 2 10% 36% 38% 6%	567
	11th to 20th	Night	6% 3 15% 40% 33% 4	564
	21st to end	Night	4 1 16% 42% 31% 5%	627
September	1st to 10th	Night	8% 3 20% 40% 28% 2	570
	11th to 20th	Night	5% 5% 25% 41% 21% 3	570
	21st to end	Night	8% 9% 25% 40% 16% 2	570
October	1st to 10th	Night	5% 14% 33% 33% 15% 1	723
	11th to 20th	Night	7% 18% 34% 28% 10% 3	760
	21st to end	Night	14% 19% 28% 23% 12% 4	836
November	1st to 10th	Night	8% 19% 33% 29% 10% 2	883
	11th to 20th	Night	10% 22% 35% 23% 10% 1	950
	21st to end	Night	12% 21% 33% 23% 11% 1	950
December	1st to 10th	Night	13% 27% 35% 16% 7% 1	950
	11th to 20th	Night	12% 29% 31% 21% 6% 1	950
	21st to end	Night	16% 28% 35% 17% 4 1	1045

Page generated at 2024-10-30 11:19:24. Version ac07

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