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 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	14% 11% 3 6% 4 3 3 3 4 5% 45%	101499
	Night	16% 14% 3 7% 4 3 3 3 4 5% 38%	97654
Transparency	Day	43% 5% 10% 19% 16% 8%	101246
	Night	49% 5% 10% 16% 14% 6%	97497
Seeing	Day	23% 13% 27% 23% 11% 4	14792
	Night	25% 7% 15% 29% 21% 3	23784

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	22% 28% 5% 9% 4 4 3 2 3 3 16%	2539
	11th to 20th	Day	28% 20% 3 9% 4 4 3 3 3 3 21%	2573
	21st to end	Day	23% 18% 5% 8% 5% 4 4 3 4 5% 21%	3146
February	1st to 10th	Day	19% 20% 4 8% 5% 4 4 4 4 5% 24%	1710
	11th to 20th	Day	19% 20% 5% 7% 5% 3 4 3 4 5% 24%	1665
	21st to end	Day	19% 25% 5% 8% 5% 4 4 3 3 5% 19%	1521
March	1st to 10th	Day	15% 23% 5% 9% 5% 3 3 3 3 5% 25%	3314
	11th to 20th	Day	13% 17% 3 7% 4 3 3 2 3 4 41%	3490
	21st to end	Day	18% 21% 5% 11% 6% 6% 4 3 4 6% 16%	3903
April	1st to 10th	Day	23% 23% 4 8% 5% 4 3 3 3 4 20%	2280
	11th to 20th	Day	19% 21% 4 8% 5% 4 3 3 4 5% 26%	2249
	21st to end	Day	21% 16% 3 7% 4 3 4 3 4 6% 29%	2404
May	1st to 10th	Day	19% 15% 3 6% 4 3 3 2 4 4 36%	4260
	11th to 20th	Day	11% 7% 2 5% 3 3 3 3 4 6% 53%	4377
	21st to end	Day	17% 10% 2 7% 5% 4 4 3 5% 8% 35%	4813
June	1st to 10th	Day	20% 9% 2 6% 6% 4 3 3 4 7% 34%	2660
	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	17% 6% 2 4 3 3 3 3 5% 4 50%	1900
	11th to 20th	Day	17% 7% 2 5% 4 4 3 3 6% 6% 41%	1900
	21st to end	Day	20% 8% 2 7% 5% 4 4 4 4 5% 37%	2085
November	1st to 10th	Day	26% 14% 3 6% 6% 5% 4 2 4 5% 24%	1649
	11th to 20th	Day	24% 13% 2 7% 5% 5% 4 4 4 5% 25%	1520
	21st to end	Day	21% 15% 3 7% 5% 4 4 3 4 5% 29%	1520
December	1st to 10th	Day	17% 14% 4 7% 5% 4 3 3 4 6% 33%	1520
	11th to 20th	Day	21% 18% 4 9% 4 3 4 4 5% 6% 22%	1928
	21st to end	Day	20% 20% 5% 10% 7% 4 4 3 4 4 20%	2794
January	1st to 10th	Night	24% 26% 5% 9% 4 5% 4 3 4 4 14%	4406
	11th to 20th	Night	27% 20% 4 8% 4 3 2 2 3 4 23%	4385
	21st to end	Night	23% 21% 5% 10% 5% 4 4 2 3 4 20%	4521
February	1st to 10th	Night	19% 19% 5% 8% 6% 4 4 3 4 7% 21%	2470
	11th to 20th	Night	18% 22% 3 8% 5% 4 4 2 4 5% 25%	2402
	21st to end	Night	17% 26% 6% 6% 3 3 3 3 5% 5% 23%	1932
March	1st to 10th	Night	13% 25% 6% 10% 4 4 4 3 4 5% 21%	3556
	11th to 20th	Night	11% 18% 4 6% 3 3 3 2 4 4 41%	3490
	21st to end	Night	15% 26% 7% 11% 6% 5% 4 3 4 4 16%	3750
April	1st to 10th	Night	22% 22% 5% 8% 4 4 3 2 3 4 22%	1900
	11th to 20th	Night	19% 20% 4 7% 4 3 4 4 5% 5% 25%	1879
	21st to end	Night	22% 19% 3 6% 5% 4 4 3 4 5% 25%	1772
May	1st to 10th	Night	19% 22% 4 6% 3 3 3 2 3 4 31%	2702
	11th to 20th	Night	11% 10% 3 7% 4 3 3 3 4 5% 46%	2516
	21st to end	Night	18% 15% 4 6% 3 3 3 2 3 6% 36%	2762
June	1st to 10th	Night	19% 11% 3 6% 4 4 4 4 5% 6% 35%	1520
	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	13% 7% 3 6% 3 3 3 2 4 5% 52%	2280
	11th to 20th	Night	16% 9% 2 5% 3 4 4 3 4 6% 44%	2280
	21st to end	Night	19% 12% 3 8% 4 3 4 3 4 4 36%	2511
November	1st to 10th	Night	25% 14% 4 8% 5% 4 4 3 4 5% 25%	2463
	11th to 20th	Night	27% 13% 3 7% 4 4 5% 4 5% 6% 23%	2660
	21st to end	Night	19% 16% 3 7% 4 4 4 3 4 5% 30%	2660
December	1st to 10th	Night	18% 16% 3 7% 5% 3 3 3 4 6% 31%	2660
	11th to 20th	Night	21% 17% 4 8% 5% 5% 4 4 5% 6% 21%	3276
	21st to end	Night	19% 19% 5% 9% 5% 5% 5% 3 4 4 23%	4862

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 7% 10% 3 1	2539
	11th to 20th	Day	69% 4 4 10% 7% 5%	2573
	21st to end	Day	65% 6% 8% 11% 7% 3	3146
February	1st to 10th	Day	62% 5% 11% 11% 8% 2	1710
	11th to 20th	Day	63% 6% 9% 12% 7% 3	1674
	21st to end	Day	69% 4 8% 10% 7% 2	1521
March	1st to 10th	Day	62% 4 8% 18% 8%	3314
	11th to 20th	Day	47% 5% 8% 22% 16% 2	3490
	21st to end	Day	69% 8% 10% 9% 4	3903
April	1st to 10th	Day	68% 5% 10% 11% 6% 1	2280
	11th to 20th	Day	62% 6% 10% 12% 8% 3	2252
	21st to end	Day	57% 6% 11% 16% 8% 1	2404
May	1st to 10th	Day	52% 5% 11% 20% 11%	4260
	11th to 20th	Day	32% 4 13% 34% 17% 1	4380
	21st to end	Day	48% 6% 24% 19% 2	4814
June	1st to 10th	Day	50% 6% 13% 22% 8%	2660
	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	38% 5% 8% 19% 18% 12%	1900
	11th to 20th	Day	42% 5% 12% 16% 18% 7%	1900
	21st to end	Day	49% 5% 9% 13% 18% 6%	2085
November	1st to 10th	Day	62% 4 7% 12% 11% 3	1649
	11th to 20th	Day	60% 5% 9% 11% 9% 5%	1520
	21st to end	Day	58% 4 7% 11% 12% 7%	1520
December	1st to 10th	Day	53% 4 9% 17% 13% 3	1520
	11th to 20th	Day	62% 6% 11% 11% 9% 1	1928
	21st to end	Day	68% 4 6% 16% 4 2	2794
January	1st to 10th	Night	75% 4 7% 8% 4 2	4406
	11th to 20th	Night	67% 3 7% 11% 8% 5%	4385
	21st to end	Night	69% 4 6% 9% 8% 3	4521
February	1st to 10th	Night	63% 5% 11% 11% 8% 2	2470
	11th to 20th	Night	63% 5% 8% 14% 6% 4	2404
	21st to end	Night	63% 5% 8% 12% 9% 2	1932
March	1st to 10th	Night	64% 4 10% 18% 4 1	3556
	11th to 20th	Night	48% 6% 9% 22% 12% 2	3490
	21st to end	Night	71% 7% 10% 10% 2	3750
April	1st to 10th	Night	67% 5% 12% 11% 6%	1900
	11th to 20th	Night	61% 7% 12% 11% 6% 3	1879
	21st to end	Night	60% 6% 14% 12% 6% 2	1772
May	1st to 10th	Night	58% 5% 10% 14% 12% 1	2702
	11th to 20th	Night	40% 5% 11% 32% 12% 1	2516
	21st to end	Night	50% 7% 26% 15% 2	2762
June	1st to 10th	Night	50% 7% 14% 24% 5%	1520
	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	36% 5% 9% 17% 20% 12%	2280
	11th to 20th	Night	41% 5% 11% 17% 19% 6%	2280
	21st to end	Night	52% 5% 7% 11% 17% 8%	2511
November	1st to 10th	Night	62% 4 9% 10% 12% 3	2463
	11th to 20th	Night	61% 5% 10% 9% 10% 4	2660
	21st to end	Night	56% 5% 7% 10% 13% 9%	2660
December	1st to 10th	Night	55% 5% 8% 15% 14% 3	2660
	11th to 20th	Night	63% 6% 9% 10% 10% 2	3276
	21st to end	Night	63% 6% 9% 16% 5% 2	4862

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	42% 15% 23% 11% 8% 1	180
	11th to 20th	Day	40% 13% 17% 18% 8% 5%	200
	21st to end	Day	36% 12% 21% 17% 13% 2	407
February	1st to 10th	Day	31% 16% 23% 17% 10% 2	370
	11th to 20th	Day	38% 14% 25% 17% 5% 1	365
	21st to end	Day	38% 16% 21% 20% 5% 1	359
March	1st to 10th	Day	37% 16% 24% 18% 5% 1	460
	11th to 20th	Day	33% 15% 24% 19% 8% 1	460
	21st to end	Day	39% 14% 25% 17% 5%	506
April	1st to 10th	Day	38% 15% 19% 19% 7% 2	460
	11th to 20th	Day	38% 16% 23% 17% 4 2	452
	21st to end	Day	33% 18% 24% 18% 6% 2	460
May	1st to 10th	Day	24% 19% 27% 20% 7% 3	463
	11th to 20th	Day	31% 14% 27% 18% 7% 4	488
	21st to end	Day	28% 11% 25% 23% 8% 5%	529
June	1st to 10th	Day	21% 12% 30% 24% 9% 4	490
	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	31% 14% 21% 22% 10% 3	257
	11th to 20th	Day	26% 11% 22% 20% 17% 4	180
	21st to end	Day	28% 16% 16% 23% 14% 3	180
December	1st to 10th	Day	26% 17% 21% 22% 9% 6%	180
	11th to 20th	Day	40% 11% 21% 18% 9% 2	180
	21st to end	Day	34% 15% 18% 21% 11% 1	198
January	1st to 10th	Night	39% 10% 20% 19% 10% 2	760
	11th to 20th	Night	31% 11% 18% 24% 13% 4	760
	21st to end	Night	30% 7% 17% 29% 14% 3	836
February	1st to 10th	Night	31% 8% 20% 31% 11% 1	760
	11th to 20th	Night	31% 8% 20% 29% 11% 1	744
	21st to end	Night	33% 11% 19% 29% 8%	628
March	1st to 10th	Night	34% 10% 18% 27% 10% 1	760
	11th to 20th	Night	29% 8% 16% 32% 14% 1	760
	21st to end	Night	36% 11% 15% 25% 11% 1	836
April	1st to 10th	Night	36% 9% 17% 23% 14% 1	760
	11th to 20th	Night	32% 8% 17% 24% 16% 2	751
	21st to end	Night	34% 7% 15% 26% 17% 2	632
May	1st to 10th	Night	27% 8% 14% 30% 18% 3	477
	11th to 20th	Night	24% 8% 13% 25% 28% 2	374
	21st to end	Night	30% 6% 13% 26% 24% 2	411
June	1st to 10th	Night	24% 4 13% 29% 28% 2	380
	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% 26% 13% 2	748
	11th to 20th	Night	36% 7% 17% 27% 11% 1	760
	21st to end	Night	28% 7% 19% 30% 14% 1	760
December	1st to 10th	Night	29% 9% 18% 29% 13% 2	760
	11th to 20th	Night	39% 6% 19% 24% 11% 1	760
	21st to end	Night	42% 11% 18% 20% 7% 1	836

Page generated at 2024-10-30 10:19:22. Version ac07

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