Camas Meadows Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camas Meadows Lodge clear sky chart from 2005-11-06 to 2026-01-17.

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 6% 2 6% 5% 5% 5% 4 6% 8% 49%	131509
	Night	3 7% 3 7% 4 4 5% 5% 7% 8% 47%	128912
Transparency	Day	29% 8% 13% 26% 17% 6%	131235
	Night	31% 9% 16% 25% 14% 4	128763
Seeing	Day	9% 17% 32% 28% 12% 3	15763
	Night	7% 10% 31% 34% 15% 2	24829

By Month

Percentage Cloud Cover NW (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	3 13% 6% 13% 6% 6% 7% 6% 9% 8% 23%	3719
	11th to 20th	Day	3 10% 5% 10% 4 4 3 4 7% 8% 41%	3664
	21st to end	Day	5% 14% 3 8% 5% 4 5% 4 8% 9% 35%	4004
February	1st to 10th	Day	4 10% 4 11% 8% 6% 7% 5% 8% 8% 27%	1768
	11th to 20th	Day	5% 13% 4 8% 6% 6% 6% 5% 8% 8% 32%	1755
	21st to end	Day	3 11% 5% 11% 7% 7% 8% 4 8% 9% 29%	1630
March	1st to 10th	Day	2 7% 3 7% 5% 6% 7% 6% 10% 10% 37%	4518
	11th to 20th	Day	2 8% 2 8% 6% 6% 7% 5% 6% 8% 42%	4903
	21st to end	Day	5% 9% 3 9% 7% 7% 8% 6% 9% 10% 27%	5826
April	1st to 10th	Day	5% 9% 3 8% 8% 7% 8% 5% 8% 10% 29%	2400
	11th to 20th	Day	3 9% 3 7% 7% 6% 6% 5% 8% 9% 38%	2372
	21st to end	Day	4 6% 3 7% 6% 5% 6% 5% 8% 10% 40%	2644
May	1st to 10th	Day	4 3 2 5% 4 4 5% 4 5% 7% 57%	6320
	11th to 20th	Day	4 5% 2 6% 6% 5% 5% 4 6% 8% 49%	6277
	21st to end	Day	5% 7% 3 7% 5% 6% 5% 4 6% 8% 44%	6903
June	1st to 10th	Day	6% 6% 2 5% 6% 5% 6% 5% 8% 8% 42%	2800
	11th to 20th	Day	3 4 2 5% 5% 5% 6% 5% 7% 9% 47%	2800
	21st to end	Day	3 4 1 4 4 5% 4 4 6% 8% 57%	2800
July	1st to 10th	Day	1 1 2 2 2 3 2 3 5% 80%	6320
	11th to 20th	Day	1 1 1 2 2 2 2 2 3 4 79%	6320
	21st to end	Day	1 2 1 3 2 2 3 2 4 6% 73%	6874
August	1st to 10th	Day	1 2 1 3 2 2 3 3 5% 6% 73%	4541
	11th to 20th	Day	1 1 1 3 3 3 4 4 7% 8% 65%	4230
	21st to end	Day	4 4 2 5% 3 4 4 3 4 6% 61%	4348
September	1st to 10th	Day	3 2 1 4 2 3 4 4 5% 8% 66%	2400
	11th to 20th	Day	4 4 2 5% 4 6% 5% 4 6% 7% 53%	2400
	21st to end	Day	4 4 2 5% 4 6% 5% 4 6% 7% 55%	2148
October	1st to 10th	Day	3 2 1 5% 4 4 4 4 5% 7% 61%	3280
	11th to 20th	Day	3 4 2 6% 4 6% 7% 6% 8% 9% 44%	3261
	21st to end	Day	5% 5% 2 8% 6% 6% 5% 4 8% 9% 42%	3236
November	1st to 10th	Day	5% 12% 4 7% 6% 8% 7% 5% 7% 8% 32%	1791
	11th to 20th	Day	3 11% 4 10% 7% 6% 6% 5% 9% 8% 29%	1680
	21st to end	Day	4 11% 4 9% 7% 6% 6% 6% 8% 9% 31%	1680
December	1st to 10th	Day	3 8% 3 8% 4 4 5% 6% 9% 9% 40%	2700
	11th to 20th	Day	3 12% 5% 13% 8% 8% 7% 6% 8% 9% 21%	3105
	21st to end	Day	4 14% 6% 13% 9% 7% 7% 5% 6% 7% 23%	4092
January	1st to 10th	Night	4 13% 6% 12% 8% 7% 7% 5% 7% 7% 24%	6446
	11th to 20th	Night	3 9% 5% 9% 4 4 4 5% 9% 10% 38%	6366
	21st to end	Night	4 12% 5% 9% 6% 5% 6% 5% 9% 8% 30%	6952
February	1st to 10th	Night	4 11% 5% 10% 7% 5% 7% 5% 7% 9% 30%	2630
	11th to 20th	Night	4 10% 3 8% 5% 5% 5% 4 7% 8% 39%	2532
	21st to end	Night	4 11% 4 10% 6% 7% 6% 5% 8% 8% 32%	2000
March	1st to 10th	Night	2 6% 2 6% 4 4 6% 6% 9% 11% 43%	5376
	11th to 20th	Night	3 6% 2 7% 5% 4 5% 4 7% 8% 49%	5092
	21st to end	Night	5% 7% 3 7% 6% 6% 7% 6% 9% 11% 35%	5148
April	1st to 10th	Night	4 5% 2 7% 6% 6% 5% 6% 8% 12% 38%	2000
	11th to 20th	Night	3 6% 3 6% 5% 4 5% 4 7% 8% 48%	1979
	21st to end	Night	4 4 2 5% 5% 5% 5% 5% 7% 9% 50%	1751
May	1st to 10th	Night	3 4 1 4 3 3 4 4 6% 8% 61%	3640
	11th to 20th	Night	3 4 2 6% 3 4 5% 4 6% 8% 55%	3616
	21st to end	Night	4 3 1 4 3 4 6% 5% 8% 10% 53%	3972
June	1st to 10th	Night	4 4 2 5% 4 4 5% 5% 7% 9% 51%	1600
	11th to 20th	Night	3 3 1 4 5% 5% 5% 4 6% 9% 53%	1600
	21st to end	Night	2 2 1 4 4 4 4 5% 6% 7% 63%	1600
July	1st to 10th	Night	1 1 1 2 1 1 2 2 2 4 83%	3640
	11th to 20th	Night	1 1 1 1 1 1 3 4 86%	3640
	21st to end	Night	1 1 1 1 2 2 2 4 6% 80%	3969
August	1st to 10th	Night	1 1 1 2 2 2 2 3 4 6% 76%	2609
	11th to 20th	Night	2 1 1 2 2 3 3 2 6% 7% 73%	2823
	21st to end	Night	3 2 1 3 2 3 4 3 5% 7% 67%	3570
September	1st to 10th	Night	2 2 1 2 3 3 3 3 6% 7% 69%	2000
	11th to 20th	Night	3 3 2 5% 3 4 4 4 5% 8% 60%	2000
	21st to end	Night	3 3 1 3 3 5% 5% 4 6% 9% 58%	2248
October	1st to 10th	Night	3 3 1 4 3 3 4 4 6% 9% 60%	3920
	11th to 20th	Night	4 4 2 4 4 4 5% 5% 8% 11% 50%	3897
	21st to end	Night	6% 6% 2 5% 4 5% 5% 5% 6% 8% 48%	4564
November	1st to 10th	Night	8% 10% 2 7% 6% 6% 6% 4 7% 9% 35%	2726
	11th to 20th	Night	5% 9% 3 9% 6% 6% 6% 6% 7% 8% 35%	2940
	21st to end	Night	4 11% 4 9% 6% 6% 6% 6% 6% 8% 33%	2940
December	1st to 10th	Night	3 7% 3 6% 4 4 4 7% 9% 8% 44%	4700
	11th to 20th	Night	5% 13% 6% 11% 7% 6% 8% 7% 8% 8% 21%	5320
	21st to end	Night	6% 16% 5% 13% 7% 6% 6% 4 7% 7% 24%	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	50% 14% 13% 16% 6%	3719
	11th to 20th	Day	39% 9% 16% 26% 10% 1	3688
	21st to end	Day	41% 10% 18% 22% 9%	4004
February	1st to 10th	Day	48% 12% 17% 17% 5% 2	1768
	11th to 20th	Day	44% 12% 16% 19% 9% 1	1764
	21st to end	Day	46% 12% 17% 18% 6% 1	1630
March	1st to 10th	Day	33% 10% 19% 19% 18% 2	4518
	11th to 20th	Day	32% 9% 12% 34% 12% 1	4903
	21st to end	Day	41% 14% 19% 19% 7%	5826
April	1st to 10th	Day	44% 10% 17% 20% 8% 1	2400
	11th to 20th	Day	37% 9% 16% 23% 13% 3	2372
	21st to end	Day	33% 10% 15% 27% 13% 2	2644
May	1st to 10th	Day	23% 7% 10% 29% 23% 8%	6320
	11th to 20th	Day	27% 6% 16% 31% 19% 2	6280
	21st to end	Day	31% 10% 14% 34% 10% 1	6904
June	1st to 10th	Day	34% 8% 12% 26% 16% 4	2800
	11th to 20th	Day	28% 7% 13% 30% 19% 3	2800
	21st to end	Day	22% 6% 14% 32% 22% 4	2800
July	1st to 10th	Day	9% 3 7% 23% 29% 29%	6251
	11th to 20th	Day	10% 2 4 21% 31% 31%	6245
	21st to end	Day	12% 3 6% 31% 33% 16%	6681
August	1st to 10th	Day	12% 3 7% 22% 37% 19%	4524
	11th to 20th	Day	11% 5% 12% 43% 23% 4	4271
	21st to end	Day	22% 5% 12% 27% 29% 5%	4347
September	1st to 10th	Day	17% 4 10% 31% 29% 9%	2400
	11th to 20th	Day	25% 7% 13% 26% 22% 6%	2400
	21st to end	Day	25% 8% 16% 29% 17% 5%	2148
October	1st to 10th	Day	21% 5% 14% 40% 18% 2	3280
	11th to 20th	Day	29% 10% 18% 25% 17% 1	3261
	21st to end	Day	31% 10% 14% 26% 13% 6%	3236
November	1st to 10th	Day	46% 10% 15% 19% 9% 1	1791
	11th to 20th	Day	45% 14% 18% 16% 6% 1	1680
	21st to end	Day	43% 14% 18% 16% 8% 2	1680
December	1st to 10th	Day	33% 13% 24% 23% 7%	2700
	11th to 20th	Day	52% 15% 16% 12% 4	3108
	21st to end	Day	54% 11% 13% 17% 5%	4092
January	1st to 10th	Night	54% 12% 15% 15% 5%	6446
	11th to 20th	Night	37% 10% 16% 26% 11%	6404
	21st to end	Night	46% 10% 19% 19% 6%	6952
February	1st to 10th	Night	46% 11% 19% 17% 5% 1	2630
	11th to 20th	Night	40% 11% 18% 21% 8% 2	2534
	21st to end	Night	44% 11% 16% 19% 9%	2000
March	1st to 10th	Night	27% 10% 18% 25% 16% 4	5376
	11th to 20th	Night	28% 7% 19% 31% 14%	5093
	21st to end	Night	35% 15% 21% 23% 7%	5148
April	1st to 10th	Night	34% 9% 23% 24% 10% 1	2000
	11th to 20th	Night	31% 7% 20% 24% 17% 2	1979
	21st to end	Night	29% 9% 17% 31% 14% 1	1751
May	1st to 10th	Night	19% 5% 12% 32% 27% 5%	3637
	11th to 20th	Night	26% 6% 15% 34% 19% 1	3616
	21st to end	Night	21% 10% 23% 35% 10% 1	3972
June	1st to 10th	Night	28% 7% 17% 28% 18% 3	1600
	11th to 20th	Night	25% 6% 17% 31% 18% 3	1600
	21st to end	Night	18% 6% 16% 37% 19% 5%	1600
July	1st to 10th	Night	8% 3 9% 26% 22% 32%	3600
	11th to 20th	Night	5% 2 5% 24% 32% 33%	3592
	21st to end	Night	8% 3 7% 32% 33% 18%	3857
August	1st to 10th	Night	11% 3 8% 22% 37% 20%	2601
	11th to 20th	Night	11% 4 19% 39% 20% 6%	2848
	21st to end	Night	15% 5% 16% 30% 27% 6%	3570
September	1st to 10th	Night	14% 4 14% 29% 30% 9%	2000
	11th to 20th	Night	23% 6% 12% 29% 23% 8%	2000
	21st to end	Night	21% 6% 18% 32% 18% 6%	2248
October	1st to 10th	Night	20% 5% 12% 47% 16% 1	3920
	11th to 20th	Night	25% 10% 17% 32% 16% 1	3897
	21st to end	Night	31% 8% 16% 28% 15% 2	4564
November	1st to 10th	Night	41% 10% 19% 19% 10% 1	2726
	11th to 20th	Night	41% 15% 17% 20% 6% 1	2940
	21st to end	Night	44% 12% 17% 18% 8% 1	2940
December	1st to 10th	Night	32% 12% 21% 26% 9%	4700
	11th to 20th	Night	53% 15% 16% 11% 5%	5316
	21st to end	Night	52% 10% 15% 15% 7%	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	10% 15% 34% 26% 13% 2	220
	11th to 20th	Day	13% 11% 32% 27% 13% 5%	212
	21st to end	Day	9% 11% 37% 27% 12% 3	220
February	1st to 10th	Day	11% 23% 37% 24% 4 1	368
	11th to 20th	Day	14% 21% 40% 18% 7%	395
	21st to end	Day	13% 21% 37% 23% 7%	404
March	1st to 10th	Day	12% 23% 36% 22% 6% 1	500
	11th to 20th	Day	10% 24% 33% 22% 11%	500
	21st to end	Day	15% 25% 35% 21% 4	550
April	1st to 10th	Day	16% 22% 32% 21% 7% 2	500
	11th to 20th	Day	12% 28% 34% 17% 6% 3	492
	21st to end	Day	12% 24% 29% 22% 10% 3	500
May	1st to 10th	Day	11% 17% 36% 25% 10% 1	503
	11th to 20th	Day	16% 16% 29% 25% 11% 3	528
	21st to end	Day	13% 14% 26% 27% 16% 4	573
June	1st to 10th	Day	10% 18% 31% 26% 12% 3	530
	11th to 20th	Day	10% 22% 34% 23% 9% 2	530
	21st to end	Day	5% 14% 31% 30% 16% 4	530
July	1st to 10th	Day	4 10% 29% 38% 16% 2	526
	11th to 20th	Day	3 16% 28% 34% 15% 4	524
	21st to end	Day	2 8% 29% 39% 17% 5%	575
August	1st to 10th	Day	5% 9% 25% 34% 21% 5%	527
	11th to 20th	Day	2 9% 25% 39% 19% 6%	517
	21st to end	Day	5% 11% 27% 37% 14% 6%	583
September	1st to 10th	Day	4 11% 32% 34% 15% 4	530
	11th to 20th	Day	6% 11% 32% 34% 15% 2	530
	21st to end	Day	9% 16% 34% 28% 11% 2	530
October	1st to 10th	Day	11% 14% 34% 25% 15%	530
	11th to 20th	Day	10% 19% 32% 24% 13% 2	530
	21st to end	Day	11% 19% 36% 25% 8% 2	387
November	1st to 10th	Day	13% 16% 37% 25% 8% 1	297
	11th to 20th	Day	13% 20% 30% 22% 11% 4	220
	21st to end	Day	7% 16% 30% 30% 13% 4	220
December	1st to 10th	Day	10% 15% 31% 23% 15% 6%	220
	11th to 20th	Day	8% 17% 35% 30% 10%	220
	21st to end	Day	8% 15% 32% 33% 10% 2	242
January	1st to 10th	Night	12% 16% 32% 27% 13% 1	840
	11th to 20th	Night	10% 10% 34% 30% 14% 2	824
	21st to end	Night	11% 7% 30% 35% 14% 3	880
February	1st to 10th	Night	10% 12% 36% 31% 12% 1	800
	11th to 20th	Night	10% 13% 28% 34% 14% 1	784
	21st to end	Night	12% 13% 30% 30% 13% 1	660
March	1st to 10th	Night	11% 12% 33% 33% 11% 1	800
	11th to 20th	Night	5% 15% 35% 30% 14% 1	800
	21st to end	Night	9% 14% 35% 32% 9% 1	880
April	1st to 10th	Night	7% 12% 35% 32% 13% 2	800
	11th to 20th	Night	5% 15% 36% 31% 11% 2	791
	21st to end	Night	6% 11% 36% 34% 11% 2	551
May	1st to 10th	Night	6% 10% 31% 40% 12% 2	400
	11th to 20th	Night	10% 7% 24% 37% 21% 2	394
	21st to end	Night	6% 5% 27% 40% 20% 2	433
June	1st to 10th	Night	7% 6% 31% 38% 16% 2	400
	11th to 20th	Night	6% 10% 36% 35% 13%	400
	21st to end	Night	2 5% 35% 36% 21% 1	400
July	1st to 10th	Night	2 2 29% 47% 19% 1	390
	11th to 20th	Night	1 4 31% 48% 15% 1	388
	21st to end	Night	1 5% 26% 43% 24% 1	438
August	1st to 10th	Night	2 4 23% 43% 26% 2	398
	11th to 20th	Night	2 3 22% 40% 28% 5%	539
	21st to end	Night	3 7% 25% 40% 23% 3	855
September	1st to 10th	Night	3 5% 25% 39% 25% 4	800
	11th to 20th	Night	4 6% 21% 36% 26% 7%	800
	21st to end	Night	4 9% 28% 35% 19% 5%	800
October	1st to 10th	Night	7% 8% 30% 36% 18% 2	800
	11th to 20th	Night	6% 11% 32% 29% 19% 4	800
	21st to end	Night	10% 11% 35% 29% 11% 4	880
November	1st to 10th	Night	11% 12% 33% 35% 9%	820
	11th to 20th	Night	10% 14% 35% 29% 10% 3	840
	21st to end	Night	9% 10% 34% 29% 14% 3	840
December	1st to 10th	Night	10% 10% 32% 32% 14% 2	840
	11th to 20th	Night	11% 11% 35% 32% 10%	840
	21st to end	Night	8% 14% 35% 34% 8%	924

Page generated at 2026-01-13 22:14:26. Version ac07

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