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 2024-03-08.

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	17% 12% 3 5% 5% 2 4 4 4 5% 40%	78555
	Night	18% 14% 4 6% 5% 3 4 4 4 5% 35%	81031
Transparency	Day	47% 5% 10% 18% 15% 5%	78262
	Night	52% 5% 9% 16% 13% 5%	80846
Seeing	Day	23% 13% 27% 23% 11% 4	13839
	Night	26% 7% 15% 29% 21% 3	23031

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% 8% 5% 3 4 3 3 3 16%	2539
	11th to 20th	Day	28% 20% 3 8% 5% 3 4 3 3 3 21%	2573
	21st to end	Day	23% 17% 5% 7% 6% 3 3 4 4 5% 21%	3146
February	1st to 10th	Day	19% 19% 4 7% 6% 3 4 5% 4 5% 24%	1710
	11th to 20th	Day	19% 19% 6% 6% 6% 3 4 4 4 5% 24%	1665
	21st to end	Day	20% 23% 5% 7% 6% 2 4 4 3 5% 19%	1521
March	1st to 10th	Day	20% 19% 5% 8% 6% 3 4 4 4 6% 21%	1973
	11th to 20th	Day	21% 18% 4 7% 5% 3 4 3 5% 6% 24%	1980
	21st to end	Day	25% 22% 4 7% 5% 4 4 3 4 5% 18%	2218
April	1st to 10th	Day	24% 22% 5% 7% 6% 3 4 3 3 4 19%	2160
	11th to 20th	Day	20% 19% 5% 7% 5% 2 3 3 4 5% 25%	2129
	21st to end	Day	22% 15% 3 5% 4 3 4 3 4 6% 31%	2277
May	1st to 10th	Day	19% 12% 3 5% 4 3 3 4 5% 6% 38%	2425
	11th to 20th	Day	19% 11% 4 6% 5% 3 4 4 5% 7% 31%	2477
	21st to end	Day	27% 10% 3 5% 4 3 4 3 5% 6% 30%	2723
June	1st to 10th	Day	21% 9% 3 6% 6% 3 4 4 4 7% 34%	2520
	11th to 20th	Day	19% 7% 3 5% 5% 2 4 4 4 6% 39%	2520
	21st to end	Day	8% 3 2 3 3 2 4 3 4 7% 61%	2520
July	1st to 10th	Day	5% 2 1 2 2 2 2 3 3 5% 72%	2520
	11th to 20th	Day	5% 2 1 3 2 2 3 3 3 4 74%	2520
	21st to end	Day	2 2 1 2 2 1 2 2 2 3 80%	2687
August	1st to 10th	Day	3 2 1 2 2 1 3 3 4 6% 72%	2328
	11th to 20th	Day	3 2 1 3 2 2 3 3 4 5% 73%	2298
	21st to end	Day	4 3 1 2 2 1 2 3 4 5% 73%	2412
September	1st to 10th	Day	5% 2 1 3 2 1 3 3 3 4 72%	2160
	11th to 20th	Day	9% 5% 2 4 4 2 4 4 5% 6% 54%	2160
	21st to end	Day	13% 5% 2 5% 4 2 3 3 5% 6% 52%	1896
October	1st to 10th	Day	18% 6% 2 4 3 2 3 4 5% 4 48%	1800
	11th to 20th	Day	18% 7% 2 4 5% 3 4 4 5% 6% 42%	1800
	21st to end	Day	21% 8% 2 6% 5% 2 4 4 4 5% 38%	1976
November	1st to 10th	Day	26% 13% 3 6% 6% 4 4 4 4 5% 24%	1640
	11th to 20th	Day	25% 12% 2 5% 6% 4 6% 4 4 5% 26%	1520
	21st to end	Day	22% 14% 3 6% 6% 3 4 4 4 5% 29%	1520
December	1st to 10th	Day	18% 12% 4 7% 5% 3 4 3 4 6% 34%	1520
	11th to 20th	Day	21% 18% 4 8% 5% 2 4 5% 5% 6% 22%	1928
	21st to end	Day	20% 19% 5% 9% 8% 3 4 4 4 4 20%	2794
January	1st to 10th	Night	24% 25% 5% 8% 5% 3 4 3 4 4 14%	4406
	11th to 20th	Night	28% 19% 5% 7% 5% 2 2 3 3 4 23%	4385
	21st to end	Night	24% 20% 5% 8% 6% 3 4 3 3 4 20%	4521
February	1st to 10th	Night	19% 18% 5% 7% 6% 3 4 4 4 7% 22%	2470
	11th to 20th	Night	19% 21% 4 7% 6% 3 4 3 4 5% 25%	2402
	21st to end	Night	18% 24% 6% 6% 4 2 3 4 5% 6% 23%	1932
March	1st to 10th	Night	19% 20% 6% 8% 5% 3 4 4 4 5% 21%	2143
	11th to 20th	Night	17% 18% 5% 7% 5% 4 5% 4 5% 7% 23%	1980
	21st to end	Night	21% 23% 6% 9% 6% 3 4 3 3 5% 17%	2138
April	1st to 10th	Night	23% 20% 5% 8% 5% 3 3 3 3 4 22%	1800
	11th to 20th	Night	21% 18% 5% 6% 5% 2 4 5% 5% 5% 25%	1779
	21st to end	Night	23% 17% 3 5% 6% 3 5% 4 4 5% 25%	1679
May	1st to 10th	Night	18% 14% 4 5% 4 3 4 3 4 5% 36%	1532
	11th to 20th	Night	18% 11% 3 7% 6% 4 4 5% 6% 7% 29%	1416
	21st to end	Night	21% 14% 5% 6% 5% 3 3 3 4 7% 29%	1552
June	1st to 10th	Night	19% 10% 3 6% 5% 3 4 5% 5% 6% 35%	1440
	11th to 20th	Night	17% 10% 4 6% 3 3 3 3 4 6% 40%	1440
	21st to end	Night	9% 4 2 3 3 1 3 3 4 5% 63%	1440
July	1st to 10th	Night	5% 3 2 3 2 2 3 3 3 4 70%	1440
	11th to 20th	Night	3 2 2 2 2 1 3 3 2 4 75%	1440
	21st to end	Night	2 1 1 1 1 1 2 2 3 4 81%	1625
August	1st to 10th	Night	4 3 1 3 3 2 2 3 3 7% 70%	1611
	11th to 20th	Night	3 2 1 3 3 1 3 3 3 4 74%	1602
	21st to end	Night	3 3 1 2 2 1 2 2 3 6% 74%	1944
September	1st to 10th	Night	5% 3 2 3 2 1 2 2 2 5% 73%	1800
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 3 5% 57%	1800
	21st to end	Night	13% 5% 2 4 4 3 4 4 5% 5% 52%	2060
October	1st to 10th	Night	14% 7% 3 5% 4 2 3 3 3 6% 50%	2160
	11th to 20th	Night	17% 8% 2 5% 4 2 4 4 4 6% 45%	2160
	21st to end	Night	20% 11% 3 7% 5% 2 4 4 4 4 37%	2378
November	1st to 10th	Night	25% 13% 4 7% 6% 3 4 3 4 5% 25%	2438
	11th to 20th	Night	27% 12% 3 6% 5% 3 5% 5% 5% 6% 24%	2660
	21st to end	Night	20% 14% 3 7% 5% 3 5% 4 4 5% 30%	2660
December	1st to 10th	Night	19% 15% 4 7% 5% 2 4 4 4 6% 31%	2660
	11th to 20th	Night	21% 17% 4 6% 6% 3 4 5% 5% 6% 22%	3276
	21st to end	Night	19% 18% 5% 8% 6% 3 5% 4 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	66% 5% 9% 13% 7%	1973
	11th to 20th	Day	63% 5% 8% 16% 7% 1	1980
	21st to end	Day	70% 6% 8% 11% 4	2218
April	1st to 10th	Day	69% 4 9% 10% 6% 1	2160
	11th to 20th	Day	62% 6% 10% 11% 7% 3	2132
	21st to end	Day	56% 6% 12% 16% 9% 1	2277
May	1st to 10th	Day	49% 5% 15% 21% 10%	2425
	11th to 20th	Day	53% 6% 12% 21% 7% 1	2480
	21st to end	Day	56% 5% 16% 19% 4	2724
June	1st to 10th	Day	50% 6% 14% 23% 7%	2520
	11th to 20th	Day	46% 7% 15% 23% 9% 1	2520
	21st to end	Day	24% 5% 14% 33% 19% 5%	2520
July	1st to 10th	Day	16% 4 12% 27% 28% 13%	2451
	11th to 20th	Day	16% 3 7% 20% 36% 18%	2445
	21st to end	Day	11% 2 3 24% 45% 15%	2538
August	1st to 10th	Day	14% 3 10% 36% 29% 8%	2312
	11th to 20th	Day	15% 3 8% 29% 35% 10%	2298
	21st to end	Day	15% 4 8% 28% 36% 9%	2412
September	1st to 10th	Day	18% 4 5% 24% 30% 19%	2160
	11th to 20th	Day	30% 5% 11% 22% 21% 11%	2160
	21st to end	Day	33% 4 9% 23% 21% 10%	1896
October	1st to 10th	Day	40% 5% 8% 18% 18% 11%	1800
	11th to 20th	Day	43% 5% 11% 15% 19% 7%	1800
	21st to end	Day	48% 5% 9% 13% 18% 7%	1976
November	1st to 10th	Day	62% 5% 7% 12% 11% 3	1640
	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% 5% 9% 15% 6% 1	2143
	11th to 20th	Night	62% 7% 10% 14% 7% 1	1980
	21st to end	Night	71% 5% 10% 10% 4	2138
April	1st to 10th	Night	67% 4 11% 11% 6%	1800
	11th to 20th	Night	62% 6% 12% 11% 6% 3	1779
	21st to end	Night	60% 6% 14% 12% 6% 2	1679
May	1st to 10th	Night	50% 6% 13% 18% 10% 2	1532
	11th to 20th	Night	53% 7% 14% 18% 6% 1	1416
	21st to end	Night	57% 7% 14% 18% 4	1552
June	1st to 10th	Night	50% 7% 15% 24% 5%	1440
	11th to 20th	Night	45% 8% 15% 26% 6% 1	1440
	21st to end	Night	25% 5% 16% 33% 15% 6%	1440
July	1st to 10th	Night	19% 4 13% 23% 28% 12%	1400
	11th to 20th	Night	16% 3 6% 24% 34% 17%	1392
	21st to end	Night	8% 2 5% 22% 50% 14%	1535
August	1st to 10th	Night	16% 3 10% 34% 30% 7%	1602
	11th to 20th	Night	16% 3 8% 30% 36% 8%	1602
	21st to end	Night	15% 3 9% 30% 34% 9%	1944
September	1st to 10th	Night	17% 3 6% 26% 30% 17%	1800
	11th to 20th	Night	30% 4 10% 25% 20% 12%	1800
	21st to end	Night	34% 4 10% 22% 17% 13%	2060
October	1st to 10th	Night	37% 5% 10% 17% 20% 11%	2160
	11th to 20th	Night	41% 5% 11% 16% 20% 7%	2160
	21st to end	Night	51% 5% 7% 11% 17% 8%	2378
November	1st to 10th	Night	62% 4 9% 10% 12% 3	2438
	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	36% 16% 24% 19% 4 1	449
	11th to 20th	Day	35% 15% 23% 19% 7% 1	420
	21st to end	Day	39% 13% 26% 17% 5%	462
April	1st to 10th	Day	40% 14% 19% 18% 8% 2	420
	11th to 20th	Day	39% 15% 23% 17% 4 3	412
	21st to end	Day	33% 17% 24% 18% 7% 1	420
May	1st to 10th	Day	23% 19% 28% 20% 8% 3	423
	11th to 20th	Day	33% 14% 25% 17% 7% 4	448
	21st to end	Day	29% 12% 24% 23% 8% 5%	485
June	1st to 10th	Day	20% 13% 30% 23% 9% 4	450
	11th to 20th	Day	23% 16% 31% 20% 8% 2	450
	21st to end	Day	6% 12% 35% 30% 12% 5%	450
July	1st to 10th	Day	7% 9% 37% 30% 10% 6%	446
	11th to 20th	Day	4 11% 40% 25% 14% 7%	444
	21st to end	Day	2 6% 41% 29% 13% 9%	487
August	1st to 10th	Day	2 8% 36% 33% 13% 8%	447
	11th to 20th	Day	3 9% 28% 34% 16% 10%	437
	21st to end	Day	6% 11% 36% 27% 14% 5%	495
September	1st to 10th	Day	7% 12% 30% 28% 18% 5%	450
	11th to 20th	Day	13% 11% 29% 31% 13% 3	450
	21st to end	Day	16% 10% 30% 24% 16% 3	450
October	1st to 10th	Day	21% 12% 23% 24% 16% 4	450
	11th to 20th	Day	22% 9% 22% 24% 19% 4	450
	21st to end	Day	29% 10% 22% 20% 13% 5%	491
November	1st to 10th	Day	30% 14% 21% 22% 10% 3	254
	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	750
	11th to 20th	Night	30% 8% 15% 33% 13% 1	720
	21st to end	Night	36% 11% 15% 25% 11% 1	792
April	1st to 10th	Night	37% 8% 16% 23% 15% 1	720
	11th to 20th	Night	33% 8% 17% 23% 16% 3	711
	21st to end	Night	34% 7% 16% 25% 17% 2	599
May	1st to 10th	Night	26% 7% 14% 30% 19% 4	452
	11th to 20th	Night	24% 7% 13% 25% 28% 2	354
	21st to end	Night	30% 5% 13% 26% 23% 2	389
June	1st to 10th	Night	24% 3 13% 30% 28% 2	360
	11th to 20th	Night	20% 6% 16% 32% 23% 2	360
	21st to end	Night	12% 2 8% 39% 36% 2	360
July	1st to 10th	Night	5% 3 7% 37% 44% 3	350
	11th to 20th	Night	5% 2 8% 47% 38% 1	348
	21st to end	Night	3 1 6% 33% 53% 4	443
August	1st to 10th	Night	6% 2 4 30% 51% 7%	537
	11th to 20th	Night	5% 1 5% 28% 51% 9%	534
	21st to end	Night	5% 3 13% 39% 36% 4	756
September	1st to 10th	Night	7% 3 12% 34% 39% 5%	720
	11th to 20th	Night	11% 3 12% 34% 34% 7%	720
	21st to end	Night	17% 3 10% 37% 28% 6%	720
October	1st to 10th	Night	17% 3 12% 35% 28% 4	720
	11th to 20th	Night	21% 6% 10% 34% 24% 4	720
	21st to end	Night	26% 8% 14% 29% 16% 6%	792
November	1st to 10th	Night	32% 7% 19% 26% 13% 2	740
	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 2024-03-05 04:24:04. Version ac07

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