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 2025-06-10.

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	14% 12% 3 6% 4 3 3 3 4 5% 43%	123860
	Night	15% 15% 4 7% 4 3 3 3 4 5% 38%	123206
Transparency	Day	43% 5% 9% 19% 16% 8%	123608
	Night	49% 5% 9% 16% 14% 7%	123046
Seeing	Day	23% 13% 27% 22% 11% 4	15489
	Night	25% 7% 15% 29% 20% 3	24579

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	26% 25% 4 8% 5% 4 3 2 3 4 16%	3639
	11th to 20th	Day	19% 15% 3 7% 3 3 3 3 3 4 37%	3701
	21st to end	Day	17% 13% 4 6% 4 3 3 3 4 5% 38%	4510
February	1st to 10th	Day	19% 21% 4 8% 5% 4 4 4 4 5% 23%	1800
	11th to 20th	Day	19% 21% 5% 7% 5% 3 4 3 4 5% 24%	1755
	21st to end	Day	19% 25% 5% 8% 5% 4 4 3 3 5% 20%	1599
March	1st to 10th	Day	14% 21% 5% 9% 5% 3 3 3 5% 7% 26%	4772
	11th to 20th	Day	16% 22% 5% 9% 5% 4 3 2 3 3 29%	5000
	21st to end	Day	17% 21% 5% 11% 6% 5% 4 3 5% 7% 16%	5590
April	1st to 10th	Day	22% 23% 4 8% 5% 4 3 3 3 4 19%	2400
	11th to 20th	Day	18% 20% 4 8% 5% 3 3 2 4 5% 28%	2369
	21st to end	Day	21% 16% 2 7% 4 3 4 3 4 6% 31%	2531
May	1st to 10th	Day	15% 11% 2 5% 4 4 4 3 4 5% 44%	6095
	11th to 20th	Day	13% 11% 4 8% 5% 4 4 3 4 5% 38%	6277
	21st to end	Day	13% 8% 2 6% 4 4 3 3 6% 9% 42%	6902
June	1st to 10th	Day	20% 9% 2 6% 5% 4 3 3 4 7% 37%	2789
	11th to 20th	Day	18% 8% 3 6% 5% 3 4 3 4 6% 40%	2660
	21st to end	Day	7% 4 1 3 3 3 3 3 5% 7% 62%	2660
July	1st to 10th	Day	3 1 1 1 1 1 1 2 2 3 83%	4420
	11th to 20th	Day	3 2 1 3 2 2 2 2 2 3 78%	4420
	21st to end	Day	2 2 1 2 2 2 2 2 2 3 82%	4700
August	1st to 10th	Day	4 3 1 3 2 2 3 2 3 5% 73%	4091
	11th to 20th	Day	3 2 1 3 2 3 3 3 5% 7% 68%	4026
	21st to end	Day	6% 4 1 3 2 2 2 2 4 5% 70%	4242
September	1st to 10th	Day	5% 2 1 3 2 2 3 3 3 5% 71%	2280
	11th to 20th	Day	9% 6% 2 5% 3 3 5% 3 4 6% 54%	2280
	21st to end	Day	12% 5% 2 5% 3 3 3 3 5% 6% 54%	2000
October	1st to 10th	Day	10% 4 1 4 3 2 3 3 4 5% 60%	3180
	11th to 20th	Day	13% 8% 2 6% 5% 5% 4 3 6% 8% 41%	3161
	21st to end	Day	19% 11% 3 7% 6% 5% 5% 4 5% 7% 30%	3431
November	1st to 10th	Day	26% 14% 3 7% 6% 5% 4 2 4 5% 24%	1728
	11th to 20th	Day	24% 15% 3 8% 5% 5% 4 4 4 5% 24%	1600
	21st to end	Day	21% 15% 3 7% 5% 4 4 3 4 5% 30%	1600
December	1st to 10th	Day	14% 10% 3 6% 4 3 4 3 4 6% 44%	2620
	11th to 20th	Day	23% 20% 4 9% 5% 4 4 4 5% 5% 17%	3028
	21st to end	Day	22% 23% 5% 12% 6% 4 4 2 3 4 15%	4004
January	1st to 10th	Night	29% 22% 4 8% 4 4 4 3 3 4 15%	6306
	11th to 20th	Night	19% 16% 4 7% 4 3 2 2 3 4 35%	6259
	21st to end	Night	17% 15% 4 8% 4 4 3 2 3 4 37%	6468
February	1st to 10th	Night	19% 20% 5% 9% 6% 4 4 3 4 6% 21%	2600
	11th to 20th	Night	18% 22% 4 8% 5% 4 4 2 4 4 24%	2532
	21st to end	Night	17% 25% 6% 6% 3 3 3 3 5% 6% 24%	2030
March	1st to 10th	Night	12% 23% 6% 10% 5% 4 4 3 5% 6% 21%	5118
	11th to 20th	Night	12% 23% 6% 8% 4 4 3 3 4 4 29%	5000
	21st to end	Night	17% 24% 6% 11% 5% 4 4 3 4 5% 17%	5385
April	1st to 10th	Night	21% 22% 5% 8% 5% 4 3 3 4 4 22%	2000
	11th to 20th	Night	19% 20% 4 7% 4 3 4 4 5% 5% 27%	1979
	21st to end	Night	22% 19% 3 6% 5% 4 4 3 4 5% 25%	1865
May	1st to 10th	Night	16% 18% 3 6% 3 3 3 2 2 3 39%	3872
	11th to 20th	Night	13% 20% 4 8% 5% 3 3 2 4 4 33%	3616
	21st to end	Night	14% 12% 3 6% 3 3 3 2 3 6% 43%	3972
June	1st to 10th	Night	18% 11% 3 6% 3 4 3 4 5% 5% 37%	1595
	11th to 20th	Night	16% 10% 3 6% 3 4 3 3 5% 6% 40%	1520
	21st to end	Night	8% 4 1 4 3 2 3 3 4 4 63%	1520
July	1st to 10th	Night	3 2 1 2 1 2 2 2 2 3 81%	2540
	11th to 20th	Night	2 2 1 3 2 1 2 2 2 3 81%	2540
	21st to end	Night	4 2 1 1 2 2 2 3 3 81%	2849
August	1st to 10th	Night	2 2 1 4 3 2 3 2 3 5% 72%	2848
	11th to 20th	Night	2 2 1 4 3 3 4 3 4 6% 66%	2812
	21st to end	Night	6% 4 2 4 2 2 2 2 3 5% 70%	3434
September	1st to 10th	Night	5% 3 2 3 2 2 2 2 2 5% 73%	1900
	11th to 20th	Night	9% 6% 2 5% 3 4 3 3 4 5% 56%	1900
	21st to end	Night	12% 6% 2 4 4 4 4 2 4 5% 53%	2176
October	1st to 10th	Night	9% 7% 2 5% 3 2 2 2 3 5% 61%	3800
	11th to 20th	Night	13% 8% 2 5% 4 4 4 3 5% 7% 44%	3777
	21st to end	Night	18% 16% 4 9% 5% 4 4 3 4 5% 28%	4135
November	1st to 10th	Night	25% 15% 3 8% 5% 4 4 3 4 5% 25%	2570
	11th to 20th	Night	27% 14% 3 7% 4 4 4 4 5% 5% 22%	2800
	21st to end	Night	19% 16% 3 7% 4 4 4 3 4 5% 31%	2800
December	1st to 10th	Night	11% 11% 2 6% 4 3 3 3 4 6% 46%	4560
	11th to 20th	Night	22% 18% 5% 9% 6% 5% 5% 4 4 5% 16%	5176
	21st to end	Night	23% 20% 4 9% 5% 4 4 3 4 4 19%	6952

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% 8% 6% 2	3639
	11th to 20th	Day	52% 4 4 14% 21% 5%	3701
	21st to end	Day	48% 4 7% 10% 18% 12%	4510
February	1st to 10th	Day	63% 6% 11% 11% 8% 2	1800
	11th to 20th	Day	63% 6% 9% 12% 7% 3	1764
	21st to end	Day	67% 4 8% 10% 7% 3	1599
March	1st to 10th	Day	57% 5% 9% 20% 9% 1	4772
	11th to 20th	Day	61% 5% 6% 16% 11% 1	5000
	21st to end	Day	66% 8% 11% 11% 3	5590
April	1st to 10th	Day	68% 5% 10% 11% 6% 1	2400
	11th to 20th	Day	59% 6% 10% 13% 9% 3	2372
	21st to end	Day	56% 6% 12% 17% 9% 1	2531
May	1st to 10th	Day	43% 5% 10% 24% 16% 2	6095
	11th to 20th	Day	45% 7% 12% 24% 12%	6280
	21st to end	Day	38% 7% 23% 28% 4 1	6904
June	1st to 10th	Day	48% 6% 13% 24% 9% 1	2789
	11th to 20th	Day	45% 7% 14% 23% 10% 1	2660
	21st to end	Day	24% 5% 14% 34% 19% 6%	2660
July	1st to 10th	Day	9% 2 7% 16% 23% 43%	4351
	11th to 20th	Day	13% 3 4 14% 26% 41%	4345
	21st to end	Day	9% 2 4 22% 45% 16%	4552
August	1st to 10th	Day	15% 3 6% 22% 38% 16%	4076
	11th to 20th	Day	16% 4 9% 35% 27% 8%	4065
	21st to end	Day	18% 4 10% 28% 24% 17%	4241
September	1st to 10th	Day	18% 4 5% 24% 31% 19%	2280
	11th to 20th	Day	30% 6% 11% 23% 20% 11%	2280
	21st to end	Day	32% 4 9% 25% 21% 9%	2000
October	1st to 10th	Day	27% 4 7% 19% 21% 21%	3180
	11th to 20th	Day	40% 6% 14% 23% 13% 4	3161
	21st to end	Day	51% 7% 9% 14% 15% 4	3431
November	1st to 10th	Day	62% 4 7% 12% 11% 3	1728
	11th to 20th	Day	62% 5% 9% 11% 8% 5%	1600
	21st to end	Day	57% 4 7% 11% 14% 7%	1600
December	1st to 10th	Day	42% 4 7% 15% 16% 16%	2620
	11th to 20th	Day	67% 6% 9% 10% 6% 1	3028
	21st to end	Day	74% 4 5% 12% 3 1	4004
January	1st to 10th	Night	74% 4 6% 8% 7% 2	6306
	11th to 20th	Night	53% 4 6% 15% 17% 5%	6259
	21st to end	Night	53% 3 5% 9% 16% 14%	6468
February	1st to 10th	Night	64% 5% 11% 11% 8% 2	2600
	11th to 20th	Night	63% 5% 8% 14% 6% 4	2534
	21st to end	Night	62% 5% 8% 12% 10% 2	2030
March	1st to 10th	Night	61% 5% 11% 15% 4 3	5118
	11th to 20th	Night	57% 7% 9% 16% 9% 1	5000
	21st to end	Night	69% 7% 11% 11% 2	5385
April	1st to 10th	Night	66% 5% 13% 11% 6%	2000
	11th to 20th	Night	59% 7% 12% 13% 7% 3	1979
	21st to end	Night	60% 6% 14% 12% 6% 2	1865
May	1st to 10th	Night	51% 5% 8% 22% 13% 1	3869
	11th to 20th	Night	54% 5% 9% 22% 9% 1	3616
	21st to end	Night	42% 7% 26% 21% 4	3972
June	1st to 10th	Night	48% 7% 14% 25% 6%	1595
	11th to 20th	Night	43% 8% 15% 26% 7% 1	1520
	21st to end	Night	25% 5% 16% 34% 15% 6%	1520
July	1st to 10th	Night	11% 2 8% 15% 29% 35%	2500
	11th to 20th	Night	12% 2 4 16% 29% 38%	2492
	21st to end	Night	10% 2 7% 21% 46% 13%	2760
August	1st to 10th	Night	16% 3 7% 23% 39% 13%	2839
	11th to 20th	Night	18% 6% 12% 35% 26% 5%	2839
	21st to end	Night	20% 4 11% 26% 29% 11%	3434
September	1st to 10th	Night	17% 3 6% 27% 30% 17%	1900
	11th to 20th	Night	30% 5% 10% 25% 19% 11%	1900
	21st to end	Night	33% 5% 10% 23% 18% 12%	2176
October	1st to 10th	Night	28% 4 8% 17% 24% 19%	3800
	11th to 20th	Night	38% 6% 15% 25% 12% 4	3777
	21st to end	Night	58% 5% 7% 12% 13% 5%	4135
November	1st to 10th	Night	62% 4 9% 10% 12% 3	2570
	11th to 20th	Night	63% 5% 10% 9% 9% 4	2800
	21st to end	Night	55% 6% 7% 10% 13% 9%	2800
December	1st to 10th	Night	39% 5% 7% 15% 23% 11%	4560
	11th to 20th	Night	68% 7% 9% 8% 6% 1	5176
	21st to end	Night	67% 6% 7% 14% 4 1	6952

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% 23% 12% 8% 1	200
	11th to 20th	Day	36% 12% 18% 21% 7% 6%	222
	21st to end	Day	34% 11% 21% 18% 14% 3	440
February	1st to 10th	Day	33% 16% 24% 16% 10% 2	400
	11th to 20th	Day	37% 16% 25% 16% 5% 1	395
	21st to end	Day	39% 15% 20% 21% 5% 1	389
March	1st to 10th	Day	36% 16% 24% 18% 5% 1	500
	11th to 20th	Day	35% 15% 24% 18% 7% 1	500
	21st to end	Day	39% 14% 24% 17% 5% 1	550
April	1st to 10th	Day	38% 15% 19% 19% 7% 2	500
	11th to 20th	Day	35% 16% 24% 17% 4 3	492
	21st to end	Day	31% 18% 25% 18% 6% 2	500
May	1st to 10th	Day	23% 19% 27% 19% 8% 3	503
	11th to 20th	Day	31% 15% 27% 17% 7% 4	528
	21st to end	Day	27% 12% 26% 23% 8% 5%	573
June	1st to 10th	Day	20% 13% 30% 24% 9% 5%	527
	11th to 20th	Day	22% 17% 30% 20% 8% 2	490
	21st to end	Day	5% 13% 35% 29% 12% 6%	490
July	1st to 10th	Day	7% 9% 37% 30% 10% 6%	486
	11th to 20th	Day	4 11% 40% 24% 14% 7%	484
	21st to end	Day	2 6% 42% 28% 13% 9%	531
August	1st to 10th	Day	2 9% 36% 32% 13% 8%	487
	11th to 20th	Day	4 9% 29% 33% 15% 9%	477
	21st to end	Day	7% 12% 35% 26% 14% 6%	539
September	1st to 10th	Day	6% 11% 31% 28% 19% 5%	490
	11th to 20th	Day	13% 12% 29% 30% 13% 3	490
	21st to end	Day	16% 10% 31% 24% 16% 3	490
October	1st to 10th	Day	19% 12% 24% 24% 16% 4	490
	11th to 20th	Day	20% 9% 23% 25% 19% 4	490
	21st to end	Day	29% 11% 23% 19% 13% 5%	534
November	1st to 10th	Day	32% 13% 20% 21% 11% 3	282
	11th to 20th	Day	31% 11% 21% 18% 15% 4	200
	21st to end	Day	29% 15% 17% 21% 16% 4	200
December	1st to 10th	Day	24% 16% 20% 22% 11% 9%	200
	11th to 20th	Day	42% 13% 20% 17% 8% 2	200
	21st to end	Day	37% 15% 18% 20% 10% 1	220
January	1st to 10th	Night	39% 10% 20% 20% 9% 2	800
	11th to 20th	Night	29% 11% 19% 25% 13% 4	800
	21st to end	Night	29% 7% 18% 29% 15% 3	880
February	1st to 10th	Night	31% 9% 19% 30% 11% 1	800
	11th to 20th	Night	31% 9% 21% 29% 10% 1	784
	21st to end	Night	33% 11% 19% 29% 8%	660
March	1st to 10th	Night	33% 11% 18% 27% 10% 1	800
	11th to 20th	Night	30% 9% 16% 31% 13% 1	800
	21st to end	Night	36% 12% 15% 25% 11% 1	880
April	1st to 10th	Night	36% 9% 17% 24% 14% 1	800
	11th to 20th	Night	31% 8% 17% 25% 16% 2	791
	21st to end	Night	33% 7% 15% 26% 17% 2	665
May	1st to 10th	Night	26% 8% 14% 30% 19% 3	502
	11th to 20th	Night	24% 9% 14% 24% 27% 2	394
	21st to end	Night	28% 5% 14% 27% 24% 2	433
June	1st to 10th	Night	24% 4 13% 30% 28% 2	399
	11th to 20th	Night	19% 7% 17% 33% 22% 2	380
	21st to end	Night	12% 3 8% 41% 35% 2	380
July	1st to 10th	Night	5% 3 8% 38% 44% 3	370
	11th to 20th	Night	4 2 9% 47% 37% 1	368
	21st to end	Night	3 1 7% 33% 51% 5%	468
August	1st to 10th	Night	5% 2 5% 31% 51% 7%	567
	11th to 20th	Night	5% 2 6% 29% 49% 9%	564
	21st to end	Night	5% 3 13% 38% 36% 5%	798
September	1st to 10th	Night	7% 3 12% 35% 39% 5%	760
	11th to 20th	Night	11% 3 12% 34% 33% 6%	760
	21st to end	Night	16% 3 11% 36% 28% 6%	760
October	1st to 10th	Night	17% 3 11% 36% 28% 4	760
	11th to 20th	Night	21% 6% 10% 35% 24% 4	760
	21st to end	Night	26% 9% 15% 28% 16% 6%	836
November	1st to 10th	Night	33% 7% 18% 27% 13% 2	780
	11th to 20th	Night	38% 8% 17% 26% 11% 1	800
	21st to end	Night	28% 8% 19% 29% 14% 1	800
December	1st to 10th	Night	28% 9% 19% 29% 15% 2	800
	11th to 20th	Night	39% 7% 19% 24% 10% 1	800
	21st to end	Night	43% 11% 18% 20% 7% 1	880

Page generated at 2025-06-07 07:28:13. Version ac07

Copyright © 2025 Attilla Danko.