Champion Saddle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Champion Saddle clear sky chart from 2005-11-06 to 2026-10-14.

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	12% 10% 2 6% 4 3 3 3 4 6% 48%	158740
	Night	14% 13% 3 7% 4 3 3 3 4 5% 42%	150440
Transparency	Day	39% 5% 9% 21% 17% 9%	153550
	Night	46% 5% 9% 18% 14% 8%	146628
Seeing	Day	22% 13% 27% 22% 11% 4	17267
	Night	25% 7% 15% 30% 20% 3	26214

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	24% 24% 5% 10% 6% 5% 4 2 3 4 14%	4722
	11th to 20th	Day	15% 11% 3 5% 3 3 2 2 4 5% 47%	4815
	21st to end	Day	14% 12% 4 8% 5% 5% 5% 4 5% 5% 35%	5843
February	1st to 10th	Day	19% 20% 4 8% 6% 4 4 4 4 5% 24%	1890
	11th to 20th	Day	18% 21% 5% 7% 5% 3 5% 3 4 5% 23%	1845
	21st to end	Day	19% 24% 5% 8% 5% 4 4 3 4 5% 20%	1677
March	1st to 10th	Day	13% 21% 5% 9% 5% 3 4 3 4 6% 25%	4877
	11th to 20th	Day	16% 22% 5% 9% 5% 4 3 2 3 3 29%	5110
	21st to end	Day	17% 21% 5% 11% 6% 5% 4 3 5% 7% 16%	5713
April	1st to 10th	Day	21% 22% 4 8% 5% 4 4 3 4 5% 20%	2520
	11th to 20th	Day	18% 20% 4 8% 5% 3 3 3 4 5% 28%	2489
	21st to end	Day	20% 16% 2 7% 3 4 4 3 4 6% 31%	2658
May	1st to 10th	Day	11% 9% 2 5% 4 4 4 3 5% 6% 47%	7905
	11th to 20th	Day	11% 11% 3 7% 5% 4 4 3 4 7% 41%	8160
	21st to end	Day	13% 8% 2 6% 4 4 3 3 6% 8% 43%	8992
June	1st to 10th	Day	19% 9% 2 6% 5% 4 3 3 4 7% 37%	2940
	11th to 20th	Day	16% 8% 2 6% 5% 3 4 3 4 6% 43%	2940
	21st to end	Day	8% 4 2 4 3 4 3 3 5% 7% 60%	2940
July	1st to 10th	Day	2 1 1 2 2 2 2 2 3 4 82%	8219
	11th to 20th	Day	3 2 1 2 1 2 2 2 2 3 80%	8220
	21st to end	Day	2 2 1 2 2 2 2 2 3 4 80%	8754
August	1st to 10th	Day	2 2 1 2 2 2 2 2 3 5% 77%	7547
	11th to 20th	Day	4 2 1 3 2 3 3 2 4 7% 68%	7563
	21st to end	Day	5% 4 1 3 2 2 3 3 4 6% 68%	7862
September	1st to 10th	Day	5% 3 1 4 2 2 3 3 3 5% 68%	2520
	11th to 20th	Day	9% 6% 2 5% 4 3 5% 3 4 6% 54%	2520
	21st to end	Day	12% 5% 2 5% 3 3 3 3 4 6% 54%	2210
October	1st to 10th	Day	10% 5% 1 4 3 2 3 3 4 5% 60%	3380
	11th to 20th	Day	13% 8% 2 6% 5% 5% 4 3 6% 8% 42%	3292
	21st to end	Day	18% 11% 3 7% 6% 5% 5% 4 5% 7% 29%	3541
November	1st to 10th	Day	25% 14% 3 7% 6% 5% 4 2 4 5% 24%	1816
	11th to 20th	Day	23% 15% 3 8% 5% 5% 4 4 5% 5% 23%	1680
	21st to end	Day	20% 15% 3 7% 5% 4 4 3 4 5% 29%	1680
December	1st to 10th	Day	15% 10% 3 6% 4 4 4 3 4 6% 43%	2700
	11th to 20th	Day	23% 20% 4 9% 5% 4 4 4 5% 5% 17%	3108
	21st to end	Day	22% 23% 5% 12% 6% 4 4 2 3 4 15%	4092
January	1st to 10th	Night	26% 23% 5% 9% 4 5% 4 3 3 4 15%	8172
	11th to 20th	Night	15% 12% 3 6% 3 2 2 2 3 5% 46%	8146
	21st to end	Night	13% 13% 4 10% 5% 5% 5% 3 4 4 35%	8371
February	1st to 10th	Night	18% 19% 5% 8% 5% 5% 4 3 4 6% 22%	2730
	11th to 20th	Night	18% 22% 4 9% 5% 4 4 2 4 4 23%	2662
	21st to end	Night	17% 24% 6% 6% 3 3 3 3 5% 5% 24%	2128
March	1st to 10th	Night	12% 23% 6% 10% 5% 4 4 3 5% 6% 21%	5232
	11th to 20th	Night	12% 23% 6% 8% 4 4 3 3 4 5% 29%	5110
	21st to end	Night	17% 23% 6% 11% 5% 4 4 3 4 5% 18%	5504
April	1st to 10th	Night	21% 22% 5% 8% 4 4 3 3 4 4 23%	2100
	11th to 20th	Night	18% 19% 4 7% 4 3 4 4 5% 5% 26%	2079
	21st to end	Night	21% 19% 3 6% 4 4 4 3 4 5% 26%	1958
May	1st to 10th	Night	13% 15% 3 6% 3 3 3 2 3 5% 43%	5025
	11th to 20th	Night	12% 18% 4 8% 5% 3 3 2 4 5% 36%	4700
	21st to end	Night	15% 13% 3 6% 3 3 3 2 4 6% 44%	5181
June	1st to 10th	Night	18% 11% 3 6% 4 4 4 4 5% 5% 37%	1680
	11th to 20th	Night	14% 10% 3 5% 3 4 4 3 5% 6% 43%	1680
	21st to end	Night	9% 5% 1 4 3 2 3 3 4 5% 62%	1680
July	1st to 10th	Night	2 2 1 2 2 2 3 2 3 5% 75%	4740
	11th to 20th	Night	2 3 1 3 2 1 2 2 1 2 81%	4740
	21st to end	Night	4 2 1 2 2 2 2 1 2 3 80%	5325
August	1st to 10th	Night	2 2 1 3 2 2 2 2 3 5% 74%	5275
	11th to 20th	Night	3 3 1 4 3 3 4 3 4 6% 66%	5292
	21st to end	Night	4 4 1 3 2 2 2 2 4 6% 70%	6381
September	1st to 10th	Night	5% 4 2 4 2 2 2 2 2 5% 70%	2100
	11th to 20th	Night	8% 6% 2 6% 3 4 3 3 4 5% 55%	2100
	21st to end	Night	11% 6% 2 4 4 4 4 3 4 5% 53%	2405
October	1st to 10th	Night	9% 7% 2 5% 3 2 2 2 3 5% 61%	4040
	11th to 20th	Night	13% 8% 2 5% 4 4 4 3 5% 7% 44%	3933
	21st to end	Night	18% 16% 4 9% 5% 4 4 3 4 5% 28%	4267
November	1st to 10th	Night	25% 14% 3 8% 5% 4 4 3 4 5% 25%	2702
	11th to 20th	Night	26% 14% 4 8% 4 4 4 4 5% 5% 22%	2940
	21st to end	Night	19% 16% 3 7% 4 4 4 3 5% 5% 31%	2940
December	1st to 10th	Night	12% 11% 2 6% 4 3 3 3 4 6% 45%	4700
	11th to 20th	Night	22% 18% 5% 9% 6% 5% 5% 4 4 5% 17%	5316
	21st to end	Night	23% 19% 4 9% 5% 4 4 3 4 4 19%	7106

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	74% 4 6% 9% 5% 2	4723
	11th to 20th	Day	40% 3 4 11% 22% 20%	4815
	21st to end	Day	50% 5% 7% 10% 16% 12%	5843
February	1st to 10th	Day	62% 6% 11% 11% 9% 2	1890
	11th to 20th	Day	63% 6% 9% 12% 7% 3	1854
	21st to end	Day	68% 4 8% 10% 8% 3	1677
March	1st to 10th	Day	58% 5% 9% 20% 9% 1	4877
	11th to 20th	Day	61% 5% 6% 15% 11% 1	5110
	21st to end	Day	66% 8% 11% 11% 3	5713
April	1st to 10th	Day	66% 5% 10% 12% 6% 1	2520
	11th to 20th	Day	60% 6% 10% 13% 8% 3	2492
	21st to end	Day	55% 6% 12% 18% 9% 1	2658
May	1st to 10th	Day	37% 5% 11% 28% 16% 2	7905
	11th to 20th	Day	40% 7% 14% 28% 11%	8163
	21st to end	Day	38% 6% 20% 27% 8% 1	8994
June	1st to 10th	Day	47% 6% 13% 24% 9% 1	2940
	11th to 20th	Day	42% 6% 13% 23% 13% 2	2940
	21st to end	Day	25% 5% 14% 32% 18% 6%	2940
July	1st to 10th	Day	9% 3 7% 26% 31% 24%	8151
	11th to 20th	Day	12% 2 4 13% 26% 42%	8145
	21st to end	Day	10% 3 5% 36% 35% 11%	8558
August	1st to 10th	Day	11% 2 5% 17% 38% 27%	5976
	11th to 20th	Day	15% 4 10% 37% 28% 6%	5962
	21st to end	Day	17% 3 8% 33% 27% 12%	6165
September	1st to 10th	Day	20% 4 5% 24% 29% 18%	2520
	11th to 20th	Day	30% 6% 11% 23% 20% 10%	2520
	21st to end	Day	32% 4 9% 25% 21% 10%	2210
October	1st to 10th	Day	28% 4 7% 18% 22% 21%	3380
	11th to 20th	Day	40% 6% 13% 23% 13% 4	3292
	21st to end	Day	51% 7% 9% 15% 14% 4	3541
November	1st to 10th	Day	62% 4 7% 12% 11% 3	1816
	11th to 20th	Day	62% 5% 9% 10% 8% 5%	1680
	21st to end	Day	57% 5% 7% 11% 13% 7%	1680
December	1st to 10th	Day	43% 4 7% 14% 15% 16%	2700
	11th to 20th	Day	67% 6% 9% 10% 7% 1	3108
	21st to end	Day	74% 4 5% 12% 3 1	4092
January	1st to 10th	Night	73% 5% 6% 8% 5% 2	8172
	11th to 20th	Night	42% 3 5% 12% 18% 20%	8146
	21st to end	Night	53% 4 5% 8% 16% 14%	8371
February	1st to 10th	Night	63% 5% 11% 11% 8% 2	2730
	11th to 20th	Night	64% 5% 8% 13% 6% 4	2664
	21st to end	Night	62% 5% 8% 12% 10% 2	2128
March	1st to 10th	Night	62% 5% 11% 15% 4 2	5232
	11th to 20th	Night	57% 7% 9% 16% 9% 2	5110
	21st to end	Night	69% 7% 11% 11% 2	5504
April	1st to 10th	Night	65% 5% 14% 11% 5%	2100
	11th to 20th	Night	59% 7% 12% 13% 7% 3	2079
	21st to end	Night	58% 6% 14% 14% 6% 2	1958
May	1st to 10th	Night	43% 5% 12% 27% 11% 1	5023
	11th to 20th	Night	49% 6% 11% 27% 7%	4700
	21st to end	Night	42% 6% 23% 24% 4	5182
June	1st to 10th	Night	48% 7% 14% 24% 7%	1680
	11th to 20th	Night	41% 8% 14% 26% 9% 2	1680
	21st to end	Night	26% 5% 16% 32% 15% 5%	1680
July	1st to 10th	Night	13% 4 10% 29% 24% 19%	4700
	11th to 20th	Night	13% 2 4 16% 31% 34%	4692
	21st to end	Night	12% 2 8% 36% 35% 7%	5210
August	1st to 10th	Night	12% 2 5% 20% 39% 23%	4169
	11th to 20th	Night	17% 6% 13% 35% 27% 3	4169
	21st to end	Night	16% 4 10% 37% 25% 8%	5000
September	1st to 10th	Night	19% 4 7% 26% 28% 16%	2100
	11th to 20th	Night	30% 6% 11% 25% 18% 10%	2100
	21st to end	Night	32% 4 10% 24% 17% 12%	2405
October	1st to 10th	Night	28% 4 8% 17% 24% 19%	4040
	11th to 20th	Night	38% 6% 15% 25% 12% 4	3933
	21st to end	Night	57% 6% 7% 12% 13% 5%	4267
November	1st to 10th	Night	61% 4 9% 10% 11% 3	2702
	11th to 20th	Night	63% 5% 10% 9% 9% 4	2940
	21st to end	Night	55% 6% 7% 10% 14% 9%	2940
December	1st to 10th	Night	40% 5% 8% 15% 22% 11%	4700
	11th to 20th	Night	68% 7% 9% 8% 7% 1	5316
	21st to end	Night	67% 6% 8% 14% 4 1	7106

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	44% 14% 22% 13% 7%	220
	11th to 20th	Day	33% 11% 16% 21% 11% 8%	243
	21st to end	Day	32% 12% 22% 18% 14% 3	473
February	1st to 10th	Day	32% 15% 23% 16% 12% 1	430
	11th to 20th	Day	35% 17% 25% 16% 5% 1	425
	21st to end	Day	39% 15% 21% 20% 5% 1	419
March	1st to 10th	Day	36% 16% 24% 19% 5% 1	540
	11th to 20th	Day	36% 15% 25% 18% 6% 1	540
	21st to end	Day	38% 15% 24% 17% 5% 1	594
April	1st to 10th	Day	36% 15% 19% 19% 8% 3	540
	11th to 20th	Day	35% 17% 23% 17% 5% 3	532
	21st to end	Day	30% 18% 26% 18% 7% 2	540
May	1st to 10th	Day	22% 19% 28% 20% 9% 3	543
	11th to 20th	Day	31% 16% 26% 17% 7% 4	568
	21st to end	Day	26% 12% 26% 23% 8% 5%	617
June	1st to 10th	Day	20% 14% 31% 23% 9% 4	570
	11th to 20th	Day	20% 17% 32% 20% 8% 3	570
	21st to end	Day	6% 13% 34% 29% 12% 6%	570
July	1st to 10th	Day	6% 9% 37% 30% 11% 7%	566
	11th to 20th	Day	4 12% 40% 24% 13% 7%	564
	21st to end	Day	2 7% 41% 27% 13% 9%	619
August	1st to 10th	Day	2 8% 37% 31% 12% 9%	567
	11th to 20th	Day	4 9% 31% 32% 15% 10%	557
	21st to end	Day	7% 12% 35% 25% 15% 7%	627
September	1st to 10th	Day	8% 12% 30% 26% 19% 5%	570
	11th to 20th	Day	12% 13% 28% 29% 14% 4	570
	21st to end	Day	15% 11% 30% 24% 17% 4	570
October	1st to 10th	Day	19% 13% 23% 25% 16% 5%	570
	11th to 20th	Day	21% 11% 23% 24% 18% 4	543
	21st to end	Day	29% 11% 24% 19% 12% 5%	578
November	1st to 10th	Day	33% 13% 20% 20% 11% 3	310
	11th to 20th	Day	30% 11% 23% 18% 15% 4	220
	21st to end	Day	27% 14% 16% 22% 16% 4	220
December	1st to 10th	Day	26% 15% 19% 22% 10% 8%	220
	11th to 20th	Day	42% 12% 19% 16% 10% 2	220
	21st to end	Day	38% 14% 17% 19% 10% 2	242
January	1st to 10th	Night	39% 11% 20% 20% 9% 2	840
	11th to 20th	Night	28% 10% 18% 26% 14% 3	840
	21st to end	Night	28% 7% 19% 30% 14% 2	924
February	1st to 10th	Night	31% 8% 19% 31% 10%	840
	11th to 20th	Night	30% 9% 21% 29% 10%	824
	21st to end	Night	34% 11% 19% 29% 8%	692
March	1st to 10th	Night	33% 11% 18% 28% 10% 1	840
	11th to 20th	Night	30% 10% 18% 30% 12% 1	840
	21st to end	Night	35% 12% 16% 25% 11% 1	924
April	1st to 10th	Night	35% 9% 16% 25% 15% 1	840
	11th to 20th	Night	31% 9% 17% 26% 15% 2	831
	21st to end	Night	33% 7% 15% 27% 17% 2	698
May	1st to 10th	Night	25% 8% 13% 31% 20% 3	527
	11th to 20th	Night	24% 9% 14% 25% 26% 2	414
	21st to end	Night	28% 5% 14% 27% 25% 2	455
June	1st to 10th	Night	24% 5% 13% 29% 27% 2	420
	11th to 20th	Night	18% 6% 16% 36% 22% 2	420
	21st to end	Night	12% 4 8% 40% 34% 2	420
July	1st to 10th	Night	4 3 8% 37% 44% 3	410
	11th to 20th	Night	4 2 11% 46% 36% 1	408
	21st to end	Night	3 1 8% 34% 50% 5%	518
August	1st to 10th	Night	5% 2 4 32% 50% 6%	627
	11th to 20th	Night	5% 2 6% 31% 48% 8%	624
	21st to end	Night	5% 3 13% 39% 35% 4	882
September	1st to 10th	Night	8% 4 13% 35% 37% 5%	840
	11th to 20th	Night	11% 3 13% 34% 33% 6%	840
	21st to end	Night	15% 4 10% 36% 29% 6%	840
October	1st to 10th	Night	16% 4 11% 36% 29% 4	840
	11th to 20th	Night	21% 6% 11% 36% 23% 4	812
	21st to end	Night	26% 9% 16% 29% 16% 5%	880
November	1st to 10th	Night	33% 8% 18% 27% 12% 2	820
	11th to 20th	Night	37% 8% 17% 27% 11% 1	840
	21st to end	Night	28% 8% 19% 30% 14% 1	840
December	1st to 10th	Night	29% 9% 19% 28% 14% 1	840
	11th to 20th	Night	39% 7% 19% 24% 10% 1	840
	21st to end	Night	42% 11% 19% 20% 7% 1	924

Page generated at 2026-10-11 02:06:28. Version ac07

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